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WO2017018169A1 - Ball joint dust cover - Google Patents

Ball joint dust cover Download PDF

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Publication number
WO2017018169A1
WO2017018169A1 PCT/JP2016/070274 JP2016070274W WO2017018169A1 WO 2017018169 A1 WO2017018169 A1 WO 2017018169A1 JP 2016070274 W JP2016070274 W JP 2016070274W WO 2017018169 A1 WO2017018169 A1 WO 2017018169A1
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WO
WIPO (PCT)
Prior art keywords
stud
dust cover
ball joint
mounting portion
annular plate
Prior art date
Application number
PCT/JP2016/070274
Other languages
French (fr)
Japanese (ja)
Inventor
卓麻 廣田
Original Assignee
Nok株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nok株式会社 filed Critical Nok株式会社
Priority to JP2016564650A priority Critical patent/JP6735678B2/en
Publication of WO2017018169A1 publication Critical patent/WO2017018169A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0666—Sealing means between the socket and the inner member shaft
    • F16C11/0671—Sealing means between the socket and the inner member shaft allowing operative relative movement of joint parts due to flexing of the sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0695—Mounting of ball-joints, e.g. fixing them to a connecting rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows

Definitions

  • the present invention relates to a dust cover for a ball joint, and more particularly to a dust cover for a ball joint that can maintain a favorable sealing property even when used for a pinch bolt type ball joint.
  • ball joints are used in automobile suspension systems and steering systems.
  • the ball joint is internally filled with grease for smooth movement, and is usually covered with a dust cover in order to prevent the outflow of the ball joint and to prevent water and dust from entering from the outside.
  • ⁇ Ball joints include tapered ball joints and pinch bolt ball joints depending on the fastening method of the knuckle and stud.
  • the tapered ball joint determines the position of the knuckle 200 at a position where the tapered outer peripheral surface 100 a of the stud 100 and the tapered inner peripheral surface 200 a of the knuckle 200 overlap each other.
  • one end surface on the small diameter side of the dust cover through which the stud is inserted has a dust lip, and the dust lip is in close contact with the lower surface of the knuckle so as to seal between the knuckles. It has become. Therefore, the seal part by the dust cover is formed from the outer peripheral surface 100a of the stud 100 to the lower end surface 200b of the knuckle 200 as indicated by reference numerals S1 and S2 in FIG.
  • the pinch bolt ball joint has a structure in which a knuckle 200 is fastened to the stud 100 with a bolt 300, and a slit groove 201 is formed in the knuckle 200. Has been.
  • the seal part by the dust cover is formed only on the outer peripheral surface 100a of the stud 100, as indicated by the symbol S in FIG. For this reason, it has a structure in which foreign matter such as mud from the slit groove 201 and rust powder of the knuckle 200 easily enters. When such a foreign substance enters, wear of the seal lip portion proceeds due to the accumulated foreign substance, and the sealing performance is easily impaired.
  • annular plate also referred to as a washer, ferrule, etc.
  • Patent Document 1 an annular plate having an insertion hole through which the stud is inserted is sandwiched between the knuckle and the dust cover so as to suppress entry of foreign matter
  • FIG. 10 shows a mounting structure of a dust cover stud mounting portion 500 provided with a conventional general annular plate 400.
  • the annular plate 400 is formed in a ring shape having an insertion hole 400a through which the stud 100 is inserted in the center.
  • the diameter of the insertion hole 400 a is formed slightly larger than the outer diameter of the stud 100. For this reason, it is not possible to completely prevent foreign matter D such as mud and rust powder from the slit groove 201 of the knuckle 200 from entering the upper end surface 500a of the stud mounting portion 500 through the insertion hole 400a.
  • the foreign matter D enters the narrow space 600 formed by the insertion hole 400a of the annular plate 400, the outer peripheral surface 100a of the stud 100, and the upper end surface 500a of the stud mounting portion 500.
  • this narrow space 600 there is no escape place, and the foreign matter D continues to accumulate on the spot, so that the progress of wear caused by the foreign matter D cannot be completely suppressed. For this reason, even if the annular plate 400 is provided, only a slight life extension effect is obtained.
  • the present invention can suppress the progress of wear even if foreign matter enters the upper end surface of the stud mounting portion from the gap between the outer peripheral surface of the stud and the insertion hole of the annular plate, and can ensure the sealing performance for a long period of time. It is an object to provide a dust cover for a ball joint.
  • the dust cover In the dust cover attached to the ball joint with the knuckle attached to the end of the stud, The dust cover includes an annular plate interposed between the stud mounting portion through which the stud is inserted and the knuckle, and a reinforcement ring is embedded in the stud mounting portion.
  • the reinforcing ring is integrally provided with a protruding portion that protrudes from the upper end surface of the stud mounting portion toward the annular plate, thereby forming a space portion between the upper end surface of the stud mounting portion and the annular plate. Dust cover for ball joints.
  • the protrusion is formed in an annular shape over the circumferential direction of the reinforcing ring, 2.
  • the dust cover for a ball joint according to claim 1 wherein an annular dust lip that contacts the annular plate is formed on an outer peripheral side of the stud mounting portion. 3. A plurality of the protruding portions are formed at intervals over the circumferential direction of the reinforcing ring, 2.
  • a dust cover for a ball joint can be provided.
  • the dust cover for a ball joint according to the present invention can be suitably used for a pinch bolt ball joint.
  • Sectional drawing which shows one Embodiment of the dust cover for ball joints which concerns on this invention
  • Sectional drawing which shows one Embodiment of the pinch bolt ball joint which shows the state which mounted
  • FIG. 2 is an enlarged cross-sectional view showing a mounting structure between the dust cover and the pinch bolt ball joint stud shown in FIG.
  • the perspective view which cuts off and shows one Embodiment of the reinforcement ring embed
  • the expanded sectional view which shows the other aspect of the stud mounting part of the dust cover for ball joints based on this invention
  • the perspective view which shows other embodiments of the reinforcement ring embed
  • FIG. 6 is an enlarged cross-sectional view of the stud mounting portion in which the reinforcing ring shown in FIG. 6 is embedded.
  • Side view of main part of tapered ball joint (A) The principal part top view of a pinch bolt ball joint, (b) is the principal part side view of a pinch bolt ball joint.
  • FIG. 1 is a sectional view showing a ball joint dust cover according to a first embodiment of the present invention
  • FIG. 2 shows an embodiment of a pinch bolt ball joint showing a state in which the dust cover shown in FIG. 1 is mounted.
  • 3 is an enlarged cross-sectional view showing a structure for attaching the dust cover and the stud of the pinch bolt ball joint shown in FIG. 2
  • FIG. 4 is a perspective view showing a part of the reinforcing ring embedded in the cover body.
  • the dust cover A is composed of a cover body 1 and an annular plate 6.
  • the cover body 1 is formed in a cup shape by an elastic material such as a rubber-like elastic material such as chloroprene, or a thermoplastic elastomer such as a polyester-based elastomer or a thermoplastic polyurethane.
  • the annular plate 6 is a hard synthetic resin or metal ring member having an insertion hole 61 through which the stud 7 of the ball joint B is inserted at the center.
  • the stud mounting portion 2 is opened to a small diameter so that the stud 7 of the ball joint B is inserted and slidably mounted on the outer peripheral surface 71 thereof.
  • a plurality of seal lip portions 21 are formed on the inner peripheral surface of the stud mounting portion 2.
  • the socket mounting part 3 is fixed to the socket 8 of the ball joint B in a fixed position by opening with a larger diameter than the stud mounting part 2.
  • the socket 8 is a member that rotatably holds the ball head 72 of the stud 7.
  • a hard synthetic resin or metal reinforcing ring 4 is embedded in the stud mounting portion 2.
  • the reinforcing ring 4 is integrally formed with an annular protruding portion 42 that protrudes in the axial direction over the entire circumference of the reinforcing ring body 41 on the outer peripheral edge of the upper surface of the annular reinforcing ring body 41. ing. And the reinforcement ring 4 is embed
  • the dust cover A is press-fitted and fitted so that the lower end surface of the socket mounting portion 3 of the cover body 1 is abutted with a positioning step portion 81 formed at the upper end portion of the socket 8 of the ball joint B.
  • the stud 7 is inserted into the stud mounting portion 2, and the seal lip portion 21 is mounted in close contact with the outer peripheral surface 71 of the stud 7.
  • the stud 7 is inserted through the insertion hole 61 of the annular plate 6, and the annular plate 6 is placed on the stud mounting portion 2 side of the cover body 1.
  • the space portion 5 including a gap corresponding to the height of the projecting portion 42 between the annular plate 6 and the upper end surface 22 of the stud mounting portion 2. Is formed.
  • a knuckle 9 having a slit groove 91 is attached to the end of the stud 7 protruding from the cover body 1 and the annular plate 6 and fastened with a bolt 10 so that the periphery of the stud 7 is covered with the socket 8.
  • a dust cover A is attached to the knuckle 9.
  • the inner diameter of the insertion hole 61 of the annular plate 6 is slightly larger than the outer diameter of the stud 7, foreign matter such as mud and rust powder from the slit 91 of the knuckle 9 passes through the insertion hole 61.
  • the upper end surface 22 of the mounting portion 2 may enter.
  • the space portion 5 is formed on the upper end surface 22 of the stud mounting portion 2, the infiltrated foreign matter does not accumulate near the seal lip portion 21 of the stud mounting portion 2, and also in the space portion 5. Infiltrate. As a result, the amount of foreign matter deposited in the vicinity of the seal lip 21 is greatly reduced.
  • the projecting portion 42 for securing the space portion 5 is formed by the reinforcing ring 4, it is difficult to generate wear and settling due to sliding, and the space portion 5 can be secured for a long period of time.
  • annular dust strip 23 that contacts the annular plate 6 on the outer peripheral side of the stud mounting portion 2 of the cover body 1.
  • the upper end surface 22 of the stud mounting portion 2 preferably has a tapered surface 24 inclined downward in the radial direction from the inner peripheral edge.
  • the protruding portion 42 of the reinforcing ring 4 embedded in the stud mounting portion 2 is not limited to being formed in an annular shape over the entire circumference of the reinforcing ring 4, but in the circumferential direction of the reinforcing ring 4 as shown in FIG. 6. A plurality of them may be formed at intervals.
  • the elastic material of the stud mounting portion 2 is not provided on the outer peripheral side of the protruding portion 42 in the reinforcing ring 4. For this reason, the discharge groove
  • the upper end surface 22 of the stud mounting portion 2 has a tapered surface 24 as shown in FIG. Accordingly, the foreign matter that has entered the space 5 can be discharged to the outside more quickly by the discharge groove 43.
  • the dust cover A according to the present invention does not require any changes to the stud 7 and the socket 8 of the ball joint B, it can be used as it is for an existing ball joint.
  • the pinch bolt ball joint using the knuckle 9 having the slot 91 is described as the ball joint B to which the dust cover A according to the present invention is applied.
  • the dust cover according to the present invention is described.
  • A can be similarly applied to a tapered ball joint as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

The present invention addresses the problem of providing a ball joint dust cover that can suppress the advancement of wear and that can ensure long-term sealing, even if foreign material infiltrates an upper-end surface of a stud-mounting part from a gap between an outer circumferential surface of a stud and a through hole of an annular plate. In order to solve said problem, the present invention provides a dust cover A that is mounted on a ball joint B wherein a knuckle 9 is attached to an end part of a stud 7, the dust cover A being provided with an annular plate 6 that is interposed between the knuckle 9 and a stud-mounting part 2 through which the stud passes 7. A reinforcing ring 4 is laid in the stud-mounting part 2. The reinforcing ring 4 is integrally provided with a protruding part that protrudes toward the annular plate 6 from the upper-end surface of the stud-mounting part 2 and thereby forms a space 5 between the annular plate 6 and an upper-end surface of the stud-mounting part 2.

Description

ボールジョイント用ダストカバーDust cover for ball joint
　本発明はボールジョイント用ダストカバーに関し、特にピンチボルトタイプのボールジョイントに使用した場合でも、好適にシール性を維持できるボールジョイント用ダストカバーに関する。 The present invention relates to a dust cover for a ball joint, and more particularly to a dust cover for a ball joint that can maintain a favorable sealing property even when used for a pinch bolt type ball joint.
　自動車の懸架装置や操舵装置等にはボールジョイントが数多く使用されている。ボールジョイントは、動きを滑らかにするために内部にグリースが封入され、その流出防止と外部からの水やダスト等の浸入を防ぐために、通常、ダストカバーで覆われている。 Many ball joints are used in automobile suspension systems and steering systems. The ball joint is internally filled with grease for smooth movement, and is usually covered with a dust cover in order to prevent the outflow of the ball joint and to prevent water and dust from entering from the outside.
　ボールジョイントには、ナックルとスタッドとの締結方法の相違によって、テーパー合わせボールジョイントとピンチボルトボールジョイントとがある。 ¡Ball joints include tapered ball joints and pinch bolt ball joints depending on the fastening method of the knuckle and stud.
　テーパー合わせボールジョイントは、図８に示すように、スタッド１００のテーパー状の外周面１００ａとナックル２００のテーパー状の内周面２００ａとが重なる位置でナックル２００の位置を決定するものである。 As shown in FIG. 8, the tapered ball joint determines the position of the knuckle 200 at a position where the tapered outer peripheral surface 100 a of the stud 100 and the tapered inner peripheral surface 200 a of the knuckle 200 overlap each other.
　このテーパー合わせボールジョイントにおいて、スタッドが挿通されるダストカバーの小径側の一端面はダストリップを有し、このダストリップがナックルの下面に対して密接することで、ナックルとの間をシールするようになっている。従って、ダストカバーによるシール部位は、図８中に符号Ｓ１、Ｓ２で示すように、スタッド１００の外周面１００ａからナックル２００の下端面２００ｂに亘って形成される。 In this tapered ball joint, one end surface on the small diameter side of the dust cover through which the stud is inserted has a dust lip, and the dust lip is in close contact with the lower surface of the knuckle so as to seal between the knuckles. It has become. Therefore, the seal part by the dust cover is formed from the outer peripheral surface 100a of the stud 100 to the lower end surface 200b of the knuckle 200 as indicated by reference numerals S1 and S2 in FIG.
　一方、ピンチボルトボールジョイントは、図９（ａ）、（ｂ）に示すように、スタッド１００に対してナックル２００をボルト３００で締結する構造であり、ナックル２００には、すり割り溝２０１が形成されている。 On the other hand, as shown in FIGS. 9A and 9B, the pinch bolt ball joint has a structure in which a knuckle 200 is fastened to the stud 100 with a bolt 300, and a slit groove 201 is formed in the knuckle 200. Has been.
　ところで、このようなピンチボルトボールジョイントに装着されるダストカバーは、ナックル２００にすり割り溝２０１が形成されているために、ナックル２００の下端面２００ｂに当接するダストリップを設定することができない。よって、ダストカバーによるシール部位は、図９（ｂ）中に符号Ｓで示すように、スタッド１００の外周面１００ａのみに形成される。このため、すり割り溝２０１からの泥やナックル２００の錆粉等の異物が浸入し易い構造となっている。このような異物が浸入すると、堆積した異物によって、シールリップ部の摩耗が進行してシール性が損なわれ易くなる。 By the way, in the dust cover attached to such a pinch bolt ball joint, since the slit groove 201 is formed in the knuckle 200, it is not possible to set a dust lip that contacts the lower end surface 200b of the knuckle 200. Therefore, the seal part by the dust cover is formed only on the outer peripheral surface 100a of the stud 100, as indicated by the symbol S in FIG. For this reason, it has a structure in which foreign matter such as mud from the slit groove 201 and rust powder of the knuckle 200 easily enters. When such a foreign substance enters, wear of the seal lip portion proceeds due to the accumulated foreign substance, and the sealing performance is easily impaired.
　そこで、従来、ナックルとダストカバーとの間に、スタッドを挿通させる挿通孔を有する環状プレート（ワッシャ、フェルール等ともいう。）を挟み、異物の浸入を抑制するようにしている（特許文献１、２）。 Therefore, conventionally, an annular plate (also referred to as a washer, ferrule, etc.) having an insertion hole through which the stud is inserted is sandwiched between the knuckle and the dust cover so as to suppress entry of foreign matter (Patent Document 1, 2).
実公昭５８－３９２１４号公報Japanese Utility Model Publication No. 58-39214 実開昭５８－１３０１１８号公報Japanese Utility Model Publication No. 58-130118
　図１０は、従来の一般的な環状プレート４００を備えたダストカバーのスタッド装着部５００の取り付け構造を示している。通常、環状プレート４００は、中央部にスタッド１００を挿通させる挿通孔４００ａを有するリング状に形成されている。挿通孔４００ａの径はスタッド１００の外径よりも僅かに大きく形成されている。このため、この挿通孔４００ａを通して、ナックル２００のすり割り溝２０１からの泥や錆粉等の異物Ｄがスタッド装着部５００の上端面５００ａに浸入することを完全に防ぐことはできない。 FIG. 10 shows a mounting structure of a dust cover stud mounting portion 500 provided with a conventional general annular plate 400. Usually, the annular plate 400 is formed in a ring shape having an insertion hole 400a through which the stud 100 is inserted in the center. The diameter of the insertion hole 400 a is formed slightly larger than the outer diameter of the stud 100. For this reason, it is not possible to completely prevent foreign matter D such as mud and rust powder from the slit groove 201 of the knuckle 200 from entering the upper end surface 500a of the stud mounting portion 500 through the insertion hole 400a.
　この場合、環状プレート４００の挿通孔４００ａとスタッド１００の外周面１００ａとスタッド装着部５００の上端面５００ａとによって形成される狭小スペース６００に異物Ｄが浸入する。この狭小スペース６００には逃げ場がなく、異物Ｄはその場に堆積し続けるため、異物Ｄが原因となる摩耗の進行を完全には抑制できない。このため、環状プレート４００を設けても、僅かな延命効果しか得られていないのが実情である。 In this case, the foreign matter D enters the narrow space 600 formed by the insertion hole 400a of the annular plate 400, the outer peripheral surface 100a of the stud 100, and the upper end surface 500a of the stud mounting portion 500. In this narrow space 600, there is no escape place, and the foreign matter D continues to accumulate on the spot, so that the progress of wear caused by the foreign matter D cannot be completely suppressed. For this reason, even if the annular plate 400 is provided, only a slight life extension effect is obtained.
　そこで、本発明は、スタッドの外周面と環状プレートの挿通孔との隙間からスタッド装着部の上端面に異物が浸入しても、摩耗の進行を抑制でき、長期に亘ってシール性を確保できるボールジョイント用ダストカバーを提供することを課題とする。 Therefore, the present invention can suppress the progress of wear even if foreign matter enters the upper end surface of the stud mounting portion from the gap between the outer peripheral surface of the stud and the insertion hole of the annular plate, and can ensure the sealing performance for a long period of time. It is an object to provide a dust cover for a ball joint.
　本発明の他の課題は、以下の記載によって明らかとなる。 Other problems of the present invention will become apparent from the following description.
　上記課題は、以下の各発明によって解決される。 The above problems are solved by the following inventions.
　１．
　スタッドの端部にナックルが取り付けられたボールジョイントに装着されるダストカバーにおいて、
　前記ダストカバーは、前記スタッドが挿通するスタッド装着部と前記ナックルとの間に介在される環状プレートを備えると共に、前記スタッド装着部に補強環が埋設されており、
　前記補強環は、前記スタッド装着部の上端面から前記環状プレートに向けて突出する突出部を一体に備えることにより、前記スタッド装着部の上端面と前記環状プレートとの間に、空間部を形成していることを特徴とするボールジョイント用ダストカバー。
　２．
　前記突出部は、前記補強環の周方向に亘って環状に形成され、
　前記スタッド装着部の外周側に、前記環状プレートと当接する環状のダストリップ部が形成されていることを特徴とする前記１記載のボールジョイント用ダストカバー。
　３．
　前記突出部は、前記補強環の周方向に亘って間隔をおいて複数形成され、
　周方向に隣接する前記突出部の間に、前記空間部に浸入した異物を径方向に排出させる排出溝が形成されていることを特徴とする前記１記載のボールジョイント用ダストカバー。
　４．
　前記スタッド装着部の上端面は、内周縁から径方向に下り傾斜するテーパー面を有していることを特徴とする前記１、２又は３記載のボールジョイント用ダストカバー。 1.
In the dust cover attached to the ball joint with the knuckle attached to the end of the stud,
The dust cover includes an annular plate interposed between the stud mounting portion through which the stud is inserted and the knuckle, and a reinforcement ring is embedded in the stud mounting portion.
The reinforcing ring is integrally provided with a protruding portion that protrudes from the upper end surface of the stud mounting portion toward the annular plate, thereby forming a space portion between the upper end surface of the stud mounting portion and the annular plate. Dust cover for ball joints.
2.
The protrusion is formed in an annular shape over the circumferential direction of the reinforcing ring,
2. The dust cover for a ball joint according to claim 1, wherein an annular dust lip that contacts the annular plate is formed on an outer peripheral side of the stud mounting portion.
3.
A plurality of the protruding portions are formed at intervals over the circumferential direction of the reinforcing ring,
2. The ball joint dust cover according to claim 1, wherein a discharge groove is formed between the projecting portions adjacent to each other in the circumferential direction to discharge the foreign matter that has entered the space portion in the radial direction.
4).
4. The dust cover for a ball joint according to claim 1, 2 or 3, wherein an upper end surface of the stud mounting portion has a tapered surface inclined downward from the inner peripheral edge in the radial direction.
　本発明によれば、スタッドの外周面と環状プレートの挿通孔との隙間からスタッド装着部の上端面に異物が浸入しても、摩耗の進行を抑制でき、長期に亘ってシール性を確保できるボールジョイント用ダストカバーを提供することができる。特に、本発明に係るボールジョイント用ダストカバーは、ピンチボルトボールジョイントに好適に使用することができる。 According to the present invention, even if foreign matter enters the upper end surface of the stud mounting portion from the gap between the outer peripheral surface of the stud and the insertion hole of the annular plate, the progress of wear can be suppressed and the sealing performance can be ensured over a long period of time. A dust cover for a ball joint can be provided. In particular, the dust cover for a ball joint according to the present invention can be suitably used for a pinch bolt ball joint.
本発明に係るボールジョイント用ダストカバーの一実施形態を示す断面図Sectional drawing which shows one Embodiment of the dust cover for ball joints which concerns on this invention 図１に示すダストカバーを装着した状態を示すピンチボルトボールジョイントの一実施形態を示す断面図Sectional drawing which shows one Embodiment of the pinch bolt ball joint which shows the state which mounted | wore with the dust cover shown in FIG. 図２に示すダストカバーとピンチボルトボールジョイントのスタッドとの取付け構造を示す拡大断面図FIG. 2 is an enlarged cross-sectional view showing a mounting structure between the dust cover and the pinch bolt ball joint stud shown in FIG. カバー本体に埋設された補強環の一実施形態を一部切欠して示す斜視図The perspective view which cuts off and shows one Embodiment of the reinforcement ring embed | buried under the cover main body partially 本発明に係るボールジョイント用ダストカバーのスタッド装着部の他の態様を示す拡大断面図The expanded sectional view which shows the other aspect of the stud mounting part of the dust cover for ball joints based on this invention カバー本体に埋設された補強環の他の実施形態を一部切欠して示す斜視図The perspective view which shows other embodiments of the reinforcement ring embed | buried under the cover main body partly notched 図６に示す補強環が埋設されたスタッド装着部の拡大断面図FIG. 6 is an enlarged cross-sectional view of the stud mounting portion in which the reinforcing ring shown in FIG. 6 is embedded. テーパー合わせボールジョイントの要部側面図Side view of main part of tapered ball joint （ａ）はピンチボルトボールジョイントの要部平面図、（ｂ）はピンチボルトボールジョイントの要部側面図(A) The principal part top view of a pinch bolt ball joint, (b) is the principal part side view of a pinch bolt ball joint. 従来のダストカバーとピンチボルトボールジョイントのスタッドとの取付け構造を示す拡大断面図Enlarged sectional view showing the mounting structure of the conventional dust cover and pinch bolt ball joint stud
　以下、図面を参照して本発明の実施の形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本発明の第１の実施形態に係るボールジョイント用ダストカバーを示す断面図、図２は、図１に示すダストカバーを装着した状態を示すピンチボルトボールジョイントの一実施形態を示す断面図、図３は、図２に示すダストカバーとピンチボルトボールジョイントのスタッドとの取付け構造を示す拡大断面図、図４は、カバー本体に埋設された補強環を一部切欠して示す斜視図である。 FIG. 1 is a sectional view showing a ball joint dust cover according to a first embodiment of the present invention, and FIG. 2 shows an embodiment of a pinch bolt ball joint showing a state in which the dust cover shown in FIG. 1 is mounted. 3 is an enlarged cross-sectional view showing a structure for attaching the dust cover and the stud of the pinch bolt ball joint shown in FIG. 2, and FIG. 4 is a perspective view showing a part of the reinforcing ring embedded in the cover body. FIG.
　ダストカバーＡは、カバー本体１と、環状プレート６とによって構成されている。カバー本体１は、クロロプレン等のゴム状弾性材や、ポリエステル系エラストマー、熱可塑性ポリウレタン等の熱可塑性エラストマー等の弾性材によってカップ状に形成されている。環状プレート６は、中央部にボールジョイントＢのスタッド７を挿通させる挿通孔６１を有する硬質の合成樹脂製又は金属製のリング部材である。 The dust cover A is composed of a cover body 1 and an annular plate 6. The cover body 1 is formed in a cup shape by an elastic material such as a rubber-like elastic material such as chloroprene, or a thermoplastic elastomer such as a polyester-based elastomer or a thermoplastic polyurethane. The annular plate 6 is a hard synthetic resin or metal ring member having an insertion hole 61 through which the stud 7 of the ball joint B is inserted at the center.
　カバー本体１の一端（図示上端）はスタッド装着部２、他端（図示下端）はソケット装着部３となっている。スタッド装着部２は、小径に開口することで、ボールジョイントＢのスタッド７を挿通させ、その外周面７１に摺動可能に装着されるようになっている。スタッド装着部２の内周面には、複数条のシールリップ部２１が形成されている。また、ソケット装着部３は、スタッド装着部２よりも大径に開口することで、ボールジョイントＢのソケット８に対して位置不動に固定されるようになっている。ソケット８は、スタッド７の球頭部７２を回動可能に保持する部材である。 One end (upper end in the drawing) of the cover body 1 is a stud mounting portion 2 and the other end (lower end in the drawing) is a socket mounting portion 3. The stud mounting portion 2 is opened to a small diameter so that the stud 7 of the ball joint B is inserted and slidably mounted on the outer peripheral surface 71 thereof. A plurality of seal lip portions 21 are formed on the inner peripheral surface of the stud mounting portion 2. Moreover, the socket mounting part 3 is fixed to the socket 8 of the ball joint B in a fixed position by opening with a larger diameter than the stud mounting part 2. The socket 8 is a member that rotatably holds the ball head 72 of the stud 7.
　カバー本体１において、スタッド装着部２の内部には、硬質の合成樹脂製又は金属製の補強環４が埋設されている。 In the cover body 1, a hard synthetic resin or metal reinforcing ring 4 is embedded in the stud mounting portion 2.
　補強環４は、図４に示すように、環状の補強環本体４１の上面外周縁側に、該補強環本体４１の全周に亘って軸方向に突出する環状の突出部４２が一体に形成されている。そして、この突出部４２が、スタッド装着部２の上端面２２から上方に向けて突出する形となるように、該スタッド装着部２に補強環４が埋設されている。 As shown in FIG. 4, the reinforcing ring 4 is integrally formed with an annular protruding portion 42 that protrudes in the axial direction over the entire circumference of the reinforcing ring body 41 on the outer peripheral edge of the upper surface of the annular reinforcing ring body 41. ing. And the reinforcement ring 4 is embed | buried under this stud mounting part 2 so that this protrusion part 42 may become a shape which protrudes upwards from the upper end surface 22 of the stud mounting part 2. FIG.
　かかるダストカバーＡは、カバー本体１のソケット装着部３の下端面が、ボールジョイントＢのソケット８の上端部に形成された位置決め段部８１に突き合わされるように圧入嵌合され、該ソケット８に対して固定されると共に、スタッド装着部２にスタッド７を挿通させ、シールリップ部２１をスタッド７の外周面７１に密接させることによって装着される。次いで、スタッド７を環状プレート６の挿通孔６１に挿通させて、カバー本体１のスタッド装着部２側に環状プレート６を載置する。 The dust cover A is press-fitted and fitted so that the lower end surface of the socket mounting portion 3 of the cover body 1 is abutted with a positioning step portion 81 formed at the upper end portion of the socket 8 of the ball joint B. The stud 7 is inserted into the stud mounting portion 2, and the seal lip portion 21 is mounted in close contact with the outer peripheral surface 71 of the stud 7. Next, the stud 7 is inserted through the insertion hole 61 of the annular plate 6, and the annular plate 6 is placed on the stud mounting portion 2 side of the cover body 1.
　このとき、スタッド装着部２の上端面２２からは、補強環４の突出部４２が突出しているため、環状プレート６は突出部４２の上端面と当接する。これにより、図３に示すように、突出部４２の内周側で、環状プレート６とスタッド装着部２の上端面２２との間に、突出部４２の高さ分の隙間からなる空間部５が形成される。 At this time, since the protruding portion 42 of the reinforcing ring 4 protrudes from the upper end surface 22 of the stud mounting portion 2, the annular plate 6 contacts the upper end surface of the protruding portion 42. As a result, as shown in FIG. 3, on the inner peripheral side of the projecting portion 42, the space portion 5 including a gap corresponding to the height of the projecting portion 42 between the annular plate 6 and the upper end surface 22 of the stud mounting portion 2. Is formed.
　その後、カバー本体１及び環状プレート６から突出するスタッド７の端部に、すり割り溝９１を有するナックル９を取付け、ボルト１０によって締結することにより、スタッド７の周囲を覆うように、ソケット８とナックル９との間にダストカバーＡが装着される。 Thereafter, a knuckle 9 having a slit groove 91 is attached to the end of the stud 7 protruding from the cover body 1 and the annular plate 6 and fastened with a bolt 10 so that the periphery of the stud 7 is covered with the socket 8. A dust cover A is attached to the knuckle 9.
　ここで、環状プレート６の挿通孔６１の内径はスタッド７の外径よりも僅かに大きいことから、この挿通孔６１を通して、ナックル９のすり割り溝９１からの泥や錆粉等の異物がスタッド装着部２の上端面２２に浸入する場合がある。しかし、スタッド装着部２の上端面２２には空間部５が形成されているため、浸入した異物は、スタッド装着部２のシールリップ部２１付近に堆積することはなく、空間部５内にも浸入する。これにより、シールリップ部２１付近に堆積する異物の量は大幅に低減される。 Here, since the inner diameter of the insertion hole 61 of the annular plate 6 is slightly larger than the outer diameter of the stud 7, foreign matter such as mud and rust powder from the slit 91 of the knuckle 9 passes through the insertion hole 61. In some cases, the upper end surface 22 of the mounting portion 2 may enter. However, since the space portion 5 is formed on the upper end surface 22 of the stud mounting portion 2, the infiltrated foreign matter does not accumulate near the seal lip portion 21 of the stud mounting portion 2, and also in the space portion 5. Infiltrate. As a result, the amount of foreign matter deposited in the vicinity of the seal lip 21 is greatly reduced.
　よって、シールリップ部２１付近に堆積する異物が原因となるシールリップ部２１の摩耗の進行を大幅に抑制でき、シールリップ部２１の延命を図ることができる。このため、長期に亘ってシール性を確保することが可能となる。 Therefore, the progress of wear of the seal lip portion 21 caused by the foreign matter accumulated near the seal lip portion 21 can be significantly suppressed, and the life of the seal lip portion 21 can be extended. For this reason, it becomes possible to ensure sealing performance over a long period of time.
　しかも、空間部５を確保するための突出部４２は補強環４によって形成されるため、摺動による摩耗やヘタリが発生しにくく、長期間に亘って空間部５を確保することができる。 Moreover, since the projecting portion 42 for securing the space portion 5 is formed by the reinforcing ring 4, it is difficult to generate wear and settling due to sliding, and the space portion 5 can be secured for a long period of time.
　カバー本体１のスタッド装着部２の外周側には、図５に示すように、環状プレート６と当接する環状のダストリップ部２３を一体に形成することも好ましい。これにより、ダストカバーＡの外部から内部への異物の浸入を阻止することができる。 As shown in FIG. 5, it is also preferable to integrally form an annular dust strip 23 that contacts the annular plate 6 on the outer peripheral side of the stud mounting portion 2 of the cover body 1. Thereby, the penetration | invasion of the foreign material from the inside of the dust cover A can be blocked | prevented.
　また、スタッド装着部２の上端面２２は、図５に示すように、内周縁から径方向に下り傾斜するテーパー面２４を有していることも好ましい。これにより、空間部５に浸入した異物を突出部４２側、すなわち、シールリップ部２１から離れる方向に速やかに移動させることができ、シールリップ部２１付近に異物が堆積することをより好適に防止することができる。 Further, as shown in FIG. 5, the upper end surface 22 of the stud mounting portion 2 preferably has a tapered surface 24 inclined downward in the radial direction from the inner peripheral edge. As a result, the foreign matter that has entered the space 5 can be quickly moved in the direction away from the protruding portion 42, that is, in the direction away from the seal lip portion 21, and it is more preferable to prevent foreign matter from accumulating near the seal lip portion 21. can do.
　スタッド装着部２に埋設される補強環４の突出部４２は、補強環４の全周に亘って環状に形成されるものに限らず、図６に示すように、補強環４の周方向に亘って間隔をおいて複数形成したものであってもよい。この場合、図７に示すように、補強環４における突出部４２の外周側には、スタッド装着部２の弾性材は設けられていない。このため、周方向に隣接する突出部４２、４２の間に、空間部５に浸入した異物を径方向に排出させる排出溝４３が形成される。 The protruding portion 42 of the reinforcing ring 4 embedded in the stud mounting portion 2 is not limited to being formed in an annular shape over the entire circumference of the reinforcing ring 4, but in the circumferential direction of the reinforcing ring 4 as shown in FIG. 6. A plurality of them may be formed at intervals. In this case, as shown in FIG. 7, the elastic material of the stud mounting portion 2 is not provided on the outer peripheral side of the protruding portion 42 in the reinforcing ring 4. For this reason, the discharge groove | channel 43 which discharges | emits the foreign material which permeated the space part 5 to radial direction between the protrusion parts 42 and 42 adjacent to the circumferential direction is formed.
　この排出溝４３を設けることにより、空間部５に浸入した異物を外部に排出可能であるため、異物が原因となるシールリップ部２１の摩耗をさらに抑制することができる。 By providing the discharge groove 43, foreign matter that has entered the space 5 can be discharged to the outside, and thus the wear of the seal lip portion 21 caused by the foreign matter can be further suppressed.
　この排出溝４３を有する補強環４を設けた場合も、図５に示したように、スタッド装着部２の上端面２２はテーパー面２４を有するものとすることは好ましい態様である。これにより、空間部５に浸入した異物を排出溝４３によって一層速やかに外部に排出させることができる。 Even when the reinforcing ring 4 having the discharge groove 43 is provided, it is preferable that the upper end surface 22 of the stud mounting portion 2 has a tapered surface 24 as shown in FIG. Accordingly, the foreign matter that has entered the space 5 can be discharged to the outside more quickly by the discharge groove 43.
　本発明に係るダストカバーＡは、ボールジョイントＢのスタッド７及びソケット８に一切の変更を加える必要がないため、既存のボールジョイントにもそのまま使用することができる。 Since the dust cover A according to the present invention does not require any changes to the stud 7 and the socket 8 of the ball joint B, it can be used as it is for an existing ball joint.
　なお、以上の実施形態では、本発明に係るダストカバーＡが適用されるボールジョイントＢとして、すり割り溝９１を有するナックル９を使用するピンチボルトボールジョイントについて説明したが、本発明に係るダストカバーＡは、図８に示したようなテーパー合わせボールジョイントにも同様に適用することができる。 In the above embodiment, the pinch bolt ball joint using the knuckle 9 having the slot 91 is described as the ball joint B to which the dust cover A according to the present invention is applied. However, the dust cover according to the present invention is described. A can be similarly applied to a tapered ball joint as shown in FIG.
　Ａ：ダストカバー
　Ｂ：ボールジョイント（ピンチボルトボールジョイント）
　１：カバー本体
　２：スタッド装着部
　　２１：シールリップ部
　　２２：上端面
　　２３：ダストリップ部
　　２４：テーパー面
　３：ソケット装着部
　４：補強環
　　４１：補強環本体
　　４２：突出部
　　４３：排出溝
　５：空間部
　６：環状プレート
　　６１：挿通孔
　７：スタッド
　　７１：外周面
　　７２：球頭部
　８：ソケット
　　８１：位置決め段部
　９：ナックル
　　９１：すり割り溝
　１０：ボルト A: Dust cover B: Ball joint (pinch bolt ball joint)
1: Cover body 2: Stud mounting portion 21: Seal lip portion 22: Upper end surface 23: Dustrip portion 24: Tapered surface 3: Socket mounting portion 4: Reinforcement ring 41: Reinforcement ring body 42: Protruding portion 43: Discharge groove 5 : Space part 6: Annular plate 61: Insertion hole 7: Stud 71: Outer peripheral surface 72: Ball head 8: Socket 81: Positioning step part 9: Knuckle 91: Slot groove 10: Bolt

Claims (4)

  1. 　スタッドの端部にナックルが取り付けられたボールジョイントに装着されるダストカバーにおいて、
    　前記ダストカバーは、前記スタッドが挿通するスタッド装着部と前記ナックルとの間に介在される環状プレートを備えると共に、前記スタッド装着部に補強環が埋設されており、
    　前記補強環は、前記スタッド装着部の上端面から前記環状プレートに向けて突出する突出部を一体に備えることにより、前記スタッド装着部の上端面と前記環状プレートとの間に、空間部を形成していることを特徴とするボールジョイント用ダストカバー。     In the dust cover attached to the ball joint with the knuckle attached to the end of the stud,
    The dust cover includes an annular plate interposed between the stud mounting portion through which the stud is inserted and the knuckle, and a reinforcement ring is embedded in the stud mounting portion.
    The reinforcing ring is integrally provided with a protruding portion that protrudes from the upper end surface of the stud mounting portion toward the annular plate, thereby forming a space portion between the upper end surface of the stud mounting portion and the annular plate. Dust cover for ball joints.
  2. 　前記突出部は、前記補強環の周方向に亘って環状に形成され、
    　前記スタッド装着部の外周側に、前記環状プレートと当接する環状のダストリップ部が形成されていることを特徴とする請求項１記載のボールジョイント用ダストカバー。     The protrusion is formed in an annular shape over the circumferential direction of the reinforcing ring,
    The dust cover for a ball joint according to claim 1, wherein an annular dust lip that contacts the annular plate is formed on an outer peripheral side of the stud mounting portion.
  3. 　前記突出部は、前記補強環の周方向に亘って間隔をおいて複数形成され、
    　周方向に隣接する前記突出部の間に、前記空間部に浸入した異物を径方向に排出させる排出溝が形成されていることを特徴とする請求項１記載のボールジョイント用ダストカバー。     A plurality of the protruding portions are formed at intervals over the circumferential direction of the reinforcing ring,
    2. A dust cover for a ball joint according to claim 1, wherein a discharge groove is formed between the protrusions adjacent to each other in the circumferential direction to discharge the foreign matter that has entered the space in the radial direction.
  4. 　前記スタッド装着部の上端面は、内周縁から径方向に下り傾斜するテーパー面を有していることを特徴とする請求項１、２又は３記載のボールジョイント用ダストカバー。 The ball joint dust cover according to claim 1, 2 or 3, wherein the upper end surface of the stud mounting portion has a tapered surface inclined downward in the radial direction from the inner peripheral edge.
PCT/JP2016/070274 2015-07-27 2016-07-08 Ball joint dust cover WO2017018169A1 (en)

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US20230102909A1 (en) * 2020-04-22 2023-03-30 Nok Corporation Ball joint and dust cover
WO2023162678A1 (en) 2022-02-24 2023-08-31 Nok株式会社 Ball joint seal structure and ferrule ring mounting method
USD1059511S1 (en) 2020-10-09 2025-01-28 Gym-In-A-Box Llc Frame for a versatile universal gym

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US20230102909A1 (en) * 2020-04-22 2023-03-30 Nok Corporation Ball joint and dust cover
USD1059511S1 (en) 2020-10-09 2025-01-28 Gym-In-A-Box Llc Frame for a versatile universal gym
WO2023162678A1 (en) 2022-02-24 2023-08-31 Nok株式会社 Ball joint seal structure and ferrule ring mounting method

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