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WO2018198173A1 - Rail latéral - Google Patents

Rail latéral Download PDF

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Publication number
WO2018198173A1
WO2018198173A1 PCT/JP2017/016230 JP2017016230W WO2018198173A1 WO 2018198173 A1 WO2018198173 A1 WO 2018198173A1 JP 2017016230 W JP2017016230 W JP 2017016230W WO 2018198173 A1 WO2018198173 A1 WO 2018198173A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer peripheral
axial
peripheral surface
axial side
tapered
Prior art date
Application number
PCT/JP2017/016230
Other languages
English (en)
Japanese (ja)
Inventor
大志 清水
克己 村山
Original Assignee
株式会社リケン
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 株式会社リケン filed Critical 株式会社リケン
Priority to PCT/JP2017/016230 priority Critical patent/WO2018198173A1/fr
Publication of WO2018198173A1 publication Critical patent/WO2018198173A1/fr

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Classifications

    • 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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • 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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings

Definitions

  • the present invention relates to a side rail that is combined with an annular spacer expander to form a combined oil ring for an internal combustion engine together with the spacer expander.
  • the piston of a reciprocating engine is equipped with an oil ring for controlling oil on the cylinder inner surface in addition to a compression ring for sealing combustion gas.
  • an oil ring a combination oil ring constituted by combining an annular spacer expander with one or a pair of side rails is often used.
  • the side rail used for the combined oil ring is formed in a split ring shape with an abutment, and is energized by a spacer expander to expand its diameter, and a predetermined contact pressure (surface pressure) is applied to the inner surface of the cylinder on its outer peripheral surface. Contact with.
  • a predetermined contact pressure surface pressure
  • the side rail slides on the inner surface of the cylinder on the outer peripheral surface thereof to form an oil film with an appropriate thickness on the inner surface of the cylinder and to remove excess oil adhering to the inner surface of the cylinder. Scrape off towards the crank chamber to prevent oil from rising.
  • the combined oil ring also controls the oil scraping action during the piston lifting stroke (compression stroke and exhaust stroke) and the piston lowering Amplifying the oil scraping action during the stroke (intake stroke and combustion stroke) is required to have a performance capable of reducing the oil consumption while reducing the friction with respect to the inner surface of the cylinder.
  • the side rail which made the outer peripheral surface which faces a radial direction outer side various shapes is proposed.
  • Patent Document 1 describes a side rail in which an outer peripheral surface facing outward in the radial direction is formed in a curved surface shape having a vertex at the axial center position and protruding outward in the radial direction.
  • Patent Document 2 includes a pair of asymmetrical outer peripheral surfaces including an outer peripheral apex and an asymmetric region that is asymmetric in the axial direction, and symmetrical with respect to the axial direction on both sides of the axial direction across the asymmetric region.
  • a side rail having a symmetric region is described.
  • the side rail of the present invention is a side rail that is formed in a split ring shape having an abutment and is combined with an annular spacer expander to form a combined oil ring for an internal combustion engine together with the spacer expander,
  • An outer peripheral surface facing the inner side an inner peripheral surface facing the inner side in the radial direction, a first axial side surface facing one side in the axial direction, a second side facing the other side in the axial direction and parallel to the first axial side surface
  • Two axial side surfaces, the outer peripheral surface has a chamfered portion with the second axial side surface, and the chamfered portion extends from the first axial side surface to the second shaft.
  • the split ring shape provided with the abutment part is formed in the C shape where the oil ring main body was cut
  • the “axial direction” means a direction along the axis of the split ring-shaped side rail.
  • the first tapered surface portion and the second tapered surface portion are smoothly connected by a curved tapered surface sub-portion.
  • the taper surface according to the present invention is provided so as to sandwich the outer peripheral surface region in the axial direction when the region including the outer peripheral surface and the second tapered surface portion is defined as the outer peripheral surface region.
  • the region of the sub-portion and the curved outer peripheral lower end surface provided between the outer peripheral surface and the first axial side surface are the first axial side surface and the second axial side surface. It is preferable that they have asymmetric shapes with respect to a virtual plane passing through the intermediate position in the axial direction.
  • the first tapered surface portion is formed in a curved surface.
  • the present invention since a chamfered portion with visibility is provided between the outer peripheral surface and the second axial side surface, even when the side rail has vertical (front and back) orientation, By visually observing the chamfered part when assembling the piston into the ring groove, the upper and lower sides of the side rail can be easily distinguished.
  • FIG. 4 is a sectional view taken along line AA in FIG. 3.
  • FIG. 5 is a modification of the side rail shown in FIG. 4, and is a cross-sectional view when a tapered surface sub-portion is provided between a first tapered surface portion and a second tapered surface portion.
  • FIG. 5 is a modification of the side rail shown in FIG. 4, and is a cross-sectional view when a first tapered surface portion is formed in a curved surface shape.
  • a side rail 1 constitutes a combination oil ring (oil control ring) 3 together with a spacer expander 2.
  • the combination oil ring 3 is a three-piece type in which a pair of side rails 1 are combined on both sides of the spacer expander 2 in the axial direction.
  • a reciprocating internal combustion engine such as a gasoline engine is used. Used in a ring groove 4a formed on the outer peripheral surface of the piston 4 of the engine.
  • the combination oil ring 3 may be a two-piece type in which only one side rail 1 is combined with the spacer expander 2.
  • the spacer expander 2 is formed in an annular shape that can be elastically deformed radially inward and outward with a steel material.
  • the spacer expander 2 is attached to the ring groove 4a of the piston 4 while being elastically deformed in the reduced diameter direction, and the side rail 1 is moved in the radial direction. It is urged to expand the diameter toward the outer side and the outer side in the axial direction.
  • a pair of side rails 1 which are one embodiment of the invention have the same configuration as each other.
  • the joint 10 is formed. It is formed in the split ring shape provided. That is, the side rail 1 is formed in a C shape in which a part in the circumferential direction is cut and the cut portion becomes the joint 10.
  • the side rail 1 can be elastically deformed so that the interval between the joints 10 is increased in the circumferential direction, and can be expanded toward the radially outer side.
  • the side rail 1 includes a first axial side surface 11 that faces one side in the axial direction (lower side in the figure), and a second shaft that faces the other side in the axial direction (upper side in the figure).
  • a directional side surface 12, an inner peripheral surface 13 facing radially inward and an outer peripheral surface 14 facing radially outward are provided, and a cross-sectional shape perpendicular to the circumferential direction is substantially uniform over the entire circumference.
  • the “axial direction” is a direction along the axis of the split ring-shaped side rail 1.
  • the first axial side surface 11 is formed as a flat surface perpendicular to the axial direction. As shown in FIG. 2, the first axial side surface 11 is directed to the crank chamber side of the engine when the combination oil ring 3 using the side rail 1 is mounted on the piston 4.
  • the second axial side surface 12 is formed in a flat surface perpendicular to the axial direction, that is, parallel to the first axial side surface 11. As shown in FIG. 2, the second axial side surface 12 is directed toward the combustion chamber side of the engine in a state where the combination oil ring 3 using the side rail 1 is mounted on the piston 4.
  • the axial distance between the pair of axial side surfaces 11 and 12 of the side rail 1, that is, the axial thickness (rail width) W of the side rail 1 is 0.35 mm, and the inner peripheral surface 13 and the outer peripheral surface 14 , That is, the radial length L is 1.52 mm.
  • the inner peripheral surface 13 of the side rail 1 is formed in a curved surface shape (barrel face) having an apex at the axial center position. As shown in FIG. 2, the inner peripheral surface 13 of the side rail 1 contacts the seating surface 2 a of the spacer expander 2 in a state where the combination oil ring 3 using the side rail 1 is mounted on the piston 4.
  • the inner peripheral surface 13 is not limited to the above shape, and various shapes such as a cylindrical surface shape parallel to the axial direction can be employed.
  • the outer peripheral surface 14 of the side rail 1 is formed in a cylindrical surface shape parallel to the axial direction. As shown in FIG. 2, the side rail 1 is in contact with the cylinder inner surface 20 at the outer peripheral surface 14.
  • the side rail 1 is provided with a chamfered portion 30 at one end of the axial end portions of the outer peripheral surface 14. That is, the chamfered portion 30 is provided between the outer peripheral surface 14 and the second axial side surface 12.
  • the chamfered portion may not be provided between the outer peripheral surface 14 and the first axial side surface 11, but may be formed in a rounded R shape. In this case, the R shape Is formed to have a smaller radial width and axial width than the chamfered portion 30.
  • the chamfered portion 30 is located from the position on the outer peripheral surface 14 where the axial distance B from the first axial side surface 11 to the second axial side surface 12 is 0.05 mm or more, that is, from the first axial side surface 11. Starting from a position on the outer peripheral surface 14 that is 0.05 mm or more away in the axial direction toward the second axial side surface 12, the diameter gradually decreases from the starting point toward the second axial side surface 12.
  • a tapered surface 30 a extending to the second axial side surface 12 is formed.
  • the axial distance B that is the starting point of the chamfered portion 30 is more preferably set to 0.10 mm or more.
  • the tapered surface 30 a constituting the chamfered portion 30 includes a first tapered surface portion 30 a 1 that is inclined at an angle ⁇ 1 with respect to the axial direction, and a gap between the first tapered surface portion 30 a 1 and the outer peripheral surface 14.
  • the second tapered surface portion 30a2 is provided and is inclined with respect to the axial direction at an angle ⁇ 2 smaller than the first tapered surface portion 30a1.
  • the first tapered surface portion 30a1 and the second tapered surface portion 30a2 are both formed in a linearly tapered shape (conical surface shape), that is, a linear tapered surface.
  • the angle ⁇ 1 formed with respect to the axial direction of the first tapered surface portion 30a1 is set to be larger than 10 °, and more preferably 30 ° or more.
  • the radial direction length T of the chamfered portion 30, that is, the tapered surface 30a is preferably 0.05 mm or more.
  • the chamfered portion 30 having visibility is provided at one end of the axial end portions of the outer peripheral surface 14. Even if the side rail 1 has a vertical (front and back) directionality, the side chamfered portion 30 is visually observed when the side rail 1 is manufactured or when the piston 4 is assembled to the ring groove 4a. The top and bottom of the rail 1 can be easily distinguished. Therefore, it is possible to prevent the side rail 1 from being misassembled into a wrong posture during the work.
  • the tapered surface 30a constituting the chamfered portion 30 includes a first tapered surface portion 30a1 and a second tapered surface portion 30a2 that is inclined with respect to the axial direction at an angle ⁇ 2 smaller than the first tapered surface portion 30a1.
  • the incident angle with respect to the outer peripheral surface 14 can be reduced by the second tapered surface portion 30a2 while ensuring the radial length T of the chamfered portion 30 and improving its visibility.
  • oil consumption can be reduced by preventing the chamfered portion 30 from scooping up oil due to the edge of the outer peripheral surface 14 with respect to the cylinder inner surface 20.
  • the tapered surface 30a constituting the chamfered portion 30 is provided with a curved tapered surface sub-portion 30a3 between the first tapered surface portion 30a1 and the second tapered surface portion 30a2. It can also be set as the structure which connected the 1st taper surface part 30a1 and the 2nd taper surface part 30a2 smoothly by the part 30a3.
  • the tapered surface sub-part 30a3 is preferably a curved surface having a constant radius of curvature, but may be a curved surface having a gradually changing curvature radius.
  • the tapered surface 30a constituting the chamfered portion 30 is configured by providing the curved tapered surface sub-portion 30a3 between the first tapered surface portion 30a1 and the second tapered surface portion 30a2. It is possible to further effectively prevent oil from being scraped by the edge of the surface 14 and further reduce oil consumption.
  • the first tapered surface portion 30a1 of the chamfered portion 30 can be formed in a curved surface shape.
  • the first tapered surface portion 30a1 is preferably a curved surface having a constant radius of curvature, but may be a curved surface having a gradually changing curvature radius.
  • the chamfered portion 30 is configured to have the curved first tapered surface portion 30a1, so that the chamfered portion 30 can be more easily seen and the side rails 1 can be more easily discriminated. it can.
  • the taper surface sub-portion 30a3 is not provided between the first taper surface portion 30a1 and the second taper surface portion 30a2, but the first taper surface portion 30a1 and the second taper surface portion. It can also be set as the structure which provided the taper surface subpart 30a3 between 30a2.
  • an outer peripheral surface region A1 when the region where the second tapered surface portion 30 a 2 facing the radially outer side of the chamfered portion 30 is combined with the outer peripheral surface 14 is defined as an outer peripheral surface region A1, it is easy to determine whether the side rail 1 is up or down.
  • the region A3 of the lower end surface 15 is preferably asymmetric with respect to a virtual plane S passing through an axial intermediate position between the first axial side surface 11 and the second axial side surface 12.
  • the outer peripheral surface area A1 of the side rail 1 is preferably formed in an asymmetric shape in the axial direction.
  • a line passing through the center in the axial direction is defined as a first intermediate line
  • the outer peripheral apex in which the contour curve of the outer peripheral surface in the longitudinal section is traced Of the two positions on the contour curve at a distance of 3 ⁇ m toward the inner circumference, the position on the combustion chamber side of the engine is defined as position a1, the position on the side away from the combustion chamber of the engine is defined as position b1, and these positions a1 and b1
  • the length of the line segment between and L2 is L1
  • the middle line of the length L1 is the second middle line
  • the second middle line is farther from the combustion chamber of the engine than the first middle line.
  • the outer peripheral vertex of the side rail 1 is located on the second intermediate line or on the side farther from the combustion chamber of the engine than the second intermediate line, and the contour curve of the outer peripheral surface in the longitudinal section is Both axial ends at the inner circumference Is traced from the outer peripheral apex of the side rail 1 to the radial inner peripheral side to at least 0.025 mm so that a pair of symmetrical shapes exist, and the asymmetric contour curve at the outer peripheral tip of the side rail 1
  • the first contour segment, the second contour segment, and the third contour segment are defined from the combustion chamber side of the engine of the cylinder, and the first contour segment is the first end of the second contour segment on the combustion chamber side of the engine.
  • the second contour section is provided in a part of a linear shape or a quadratic curve shape starting from the section, the outer peripheral vertex is present in the middle, and is provided in an arc shape.
  • the third contour section is the engine of the second contour section.
  • the second end on the side away from the center is provided to be a part of a quadratic curve shape, and the surface roughness of the asymmetric portion of the outer peripheral surface of the side rail 1 is 0.6 ⁇ mRp or less,
  • the length on the position a1 side of the line segment L1 divided by the line in the radial direction perpendicular to the line segment between the position a1 and the position b1 and passing through the outer peripheral vertex is L2.
  • the length on the b1 side is L3, and the position on the combustion chamber side of the engine is located at the position a2 on the contour curve at a distance of 1.5 ⁇ m toward the inner circumferential side in the radial direction, on the side away from the combustion chamber of the engine
  • the position is the position b2 and the length of the line segment between the position a2 and the position b2 is L4, 0.05 mm ⁇ L1 ⁇ 0.15 mm, L2 / L1 ⁇ 0.5, L3 / L1 ⁇ 0. 74 that satisfies the condition of 74 and passes through the positions a1 and a2.
  • the angle formed by the straight line and the axial direction of the cylinder is defined as an angle ⁇ 3
  • the angle formed by the second straight line passing through the position b1 and the position b2 and the axial direction of the cylinder satisfies the condition of 2 ° ⁇ ⁇ 3 ⁇ 7 °.
  • the shape satisfies the condition of 9 ° ⁇ ⁇ 4.
  • the line passing through the center of the segment width is the first intermediate line, and the outer peripheral apex at the outer peripheral tip portion where the contour curve of the outer peripheral surface in the longitudinal section is traced.
  • the position on the combustion chamber side of the engine is the position a1 and the position on the side away from the combustion chamber of the engine is the position b1 of the two positions on the contour curve at a distance of 3 ⁇ m from the radial direction to the inner peripheral side.
  • the length of the line segment between a1 and the position b1 is L1
  • the middle line of the length L1 is the second middle line
  • the second middle line is more engine-driven than the first middle line.
  • the outer peripheral vertex of the side rail 1 located on the side away from the combustion chamber is located on the second intermediate line or on the side farther from the engine combustion chamber than the second intermediate line, and the contour curve of the outer peripheral surface in the longitudinal section is , Radial direction It is traced from the outer peripheral vertex of the side rail 1 to at least 0.025 mm toward the inner peripheral side in the radial direction so that a symmetrical shape with a pair of axially opposite ends exists at the inner peripheral side position.
  • the asymmetrical contour curve at the outer peripheral tip is directed to the inner peripheral side in the radial direction at a distance of 1.5 ⁇ m from the outer peripheral apex and the outer peripheral apex, and the distance from the outer peripheral apex toward the inner peripheral side in the segment radial direction.
  • the first contour section, second contour section, and third contour section are defined from the combustion chamber side of the cylinder engine, and the first contour section is the second contour section.
  • the first end of the engine on the combustion chamber side is provided as a starting point and is provided in a part of a linear shape or a quadratic curve shape
  • the second contour section has a flat portion in the middle thereof, and the axial direction of the engine in the axial direction of the flat portion combustion It is a shape which consists of a part of a linear shape or a quadratic curve shape from the end on the side and is continuous with the first contour section, and a quadratic curve shape from the end on the side away from the combustion chamber of the engine in the axial direction of the flat portion.
  • the third contour segment is provided in a shape that is continuous with the third contour segment.
  • the third contour segment is provided so as to be a part of a quadratic curve shape that is continuous with the second end portion.
  • the surface roughness of the asymmetric part is 0.6 ⁇ m Rp or less, and is a radial line orthogonal to the line segment between the position a1 and the position b1 in the outer peripheral tip of the contour curve of the outer peripheral surface of the side rail 1.
  • the length L1 of the line segment L1 divided by the line passing through the outer periphery vertex is L2
  • the length of the position b1 side is L3
  • the contour curve at a distance of 1.5 ⁇ m toward the radially inner periphery.
  • the angle formed by the first straight line and the axial direction of the cylinder is an angle ⁇ 3
  • the angle formed by the second straight line passing through the position b1 and the position b2 and the axial direction of the cylinder satisfying the condition of 3 ° ⁇ ⁇ 3 ⁇ 6 ° Can be made into a shape that satisfies the condition of 9 degrees ⁇ ⁇ 4.
  • the outer peripheral surface region A1 is formed in such a shape, the region A2 of the taper surface sub-portion 30a3 and the region A3 of the outer peripheral lower end surface 15 are axially intermediate positions between the first axial side surface 11 and the second axial side surface 12.
  • a hard coating (hard layer) is provided on at least the outer peripheral surface 14 and the chamfered portion 30, that is, the surface of the tapered surface 30a.
  • a hard coating for example, a configuration including at least one of a nitriding treatment layer, a PVD treatment layer, a hard chrome plating treatment layer, and a DLC layer can be adopted.
  • PVD treatment layer means a “layer formed by physical vapor deposition (Physical Vapor Deposition)”, and the “DLC (Diamond-Like Carbon) layer” is a non-layer composed mainly of hydrocarbons and carbon allotropes. It means a crystalline hard carbon film.
  • the outer peripheral surface shape is maintained, the decrease in surface pressure is small, the oil control function is maintained, and the oil consumption is increased over a long period of time.
  • the hue of the chamfered portion 30 visually recognized can be changed more clearly with respect to the second axial side surface 12 and the outer peripheral surface 14. .
  • the difference in hue becomes larger. Therefore, by providing the hard coating, it is possible to make the chamfered portion 30 easier to visually recognize, and to further facilitate the vertical discrimination of the side rail 1.
  • the outer peripheral surface 14 has a cylindrical surface shape parallel to the axial direction, but the outer peripheral surface 14 may be formed in other shapes such as upper and lower (front and back) asymmetric shapes having minute shape changes. it can.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un rail latéral (1) conçu pour comporter : une surface périphérique externe (14) orientée radialement vers l'extérieur ; une surface périphérique interne (13) orientée radialement vers l'intérieur ; une première surface latérale axiale (11) orientée vers un côté axial ; et une seconde surface latérale axiale (12) orientée vers l'autre côté axial et parallèle à la première surface latérale axiale (11). Le rail latéral (1) comporte une section chanfreinée (30) située entre la surface périphérique externe (14) et la seconde surface latérale axiale (12). La surface chanfreinée (30) présente la forme d'une surface conique (30a) présentant un diamètre diminuant progressivement en direction de la seconde surface latérale axiale (12) depuis un point situé sur la surface périphérique externe (14), le point étant situé à une distance axiale de 0,05 mm ou plus de la première surface latérale axiale (11) en direction de la seconde surface latérale axiale (12). La surface conique (30a) est conçue pour comporter : une première surface conique (30a1) ; et une seconde surface conique (30a2) disposée entre la première surface conique (30a1) et la surface périphérique externe (14) et présentant un angle d'inclinaison inférieur par rapport à la direction axiale à celui de la première surface conique (30a1).
PCT/JP2017/016230 2017-04-24 2017-04-24 Rail latéral WO2018198173A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/016230 WO2018198173A1 (fr) 2017-04-24 2017-04-24 Rail latéral

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/016230 WO2018198173A1 (fr) 2017-04-24 2017-04-24 Rail latéral

Publications (1)

Publication Number Publication Date
WO2018198173A1 true WO2018198173A1 (fr) 2018-11-01

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PCT/JP2017/016230 WO2018198173A1 (fr) 2017-04-24 2017-04-24 Rail latéral

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WO (1) WO2018198173A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023013265A1 (fr) * 2021-08-05 2023-02-09 Ｔｐｒ株式会社 Bague de lubrification

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763951U (fr) * 1980-10-03 1982-04-16
JPH051062U (ja) * 1991-06-21 1993-01-08 日野自動車工業株式会社 ピストンリングの嵌合部構造
JP2016156411A (ja) * 2015-02-23 2016-09-01 株式会社リケン サイドレール

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763951U (fr) * 1980-10-03 1982-04-16
JPH051062U (ja) * 1991-06-21 1993-01-08 日野自動車工業株式会社 ピストンリングの嵌合部構造
JP2016156411A (ja) * 2015-02-23 2016-09-01 株式会社リケン サイドレール

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023013265A1 (fr) * 2021-08-05 2023-02-09 Ｔｐｒ株式会社 Bague de lubrification
JP7224404B1 (ja) 2021-08-05 2023-02-17 Ｔｐｒ株式会社 オイルリング
JP2023026722A (ja) * 2021-08-05 2023-02-28 Ｔｐｒ株式会社 オイルリング

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