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WO1999034125A1 - Bearing with grease dosing - Google Patents

Bearing with grease dosing Download PDF

Info

Publication number
WO1999034125A1
WO1999034125A1 PCT/NL1998/000739 NL9800739W WO9934125A1 WO 1999034125 A1 WO1999034125 A1 WO 1999034125A1 NL 9800739 W NL9800739 W NL 9800739W WO 9934125 A1 WO9934125 A1 WO 9934125A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer ring
bearing
grease
disc element
ring
Prior art date
Application number
PCT/NL1998/000739
Other languages
French (fr)
Inventor
Bo Olav Jacobson
Original Assignee
Skf Engineering & Research Centre B.V.
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 Skf Engineering & Research Centre B.V. filed Critical Skf Engineering & Research Centre B.V.
Priority to AU17882/99A priority Critical patent/AU1788299A/en
Publication of WO1999034125A1 publication Critical patent/WO1999034125A1/en

Links

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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6607—Retaining the grease in or near the bearing
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6622—Details of supply and/or removal of the grease, e.g. purging grease
    • F16C33/6625—Controlling or conditioning the grease supply
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/726—Sealings with means to vent the interior of the bearing
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls

Definitions

  • the invention is related to a rolling element bearing, comprising an outer ring and an inner ring each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements which are in rolling contact with the raceways, lands bordering the raceway of at least the outer ring, and at least one disc element, such as a seal or shield, connected to the outer ring and extending towards the inner ring.
  • Such bearing is known from US-A-5348402.
  • the outer ring of this prior art bearing has tapering lands, which promote a flow of lubricant towards the raceway of said ring upon rotation thereof.
  • the lubricant generally a grease
  • the lubricant is driven towards the raceway under the influence of centrifugal forces which occur upon rotation of the outer ring. This effect is greatly dependent on the rotational speed of the outer ring. As a result a large amount of grease is forced towards the raceway in cases where said rotational speed is high. Such large amount of grease however impairs the proper function of the bearing, and leads to unacceptable high resistance and temperature increases.
  • the object of the invention is to provide a rolling element bearing wherein the amount of lubricant dosed into the raceway of the rotating outer ring can be controlled more efficiently.
  • the disc element has at least one drainage hole which is located radially inwardly with respect to the land bordering the disc element, for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the outer ring, and for maintaining a defined amount of grease in the bearing space.
  • grease is forced towards the lands of the outer ring, as occurs in the prior art bearings. However, any excess of grease may escape through the drainage holes, in such a way that a limited amount of grease remains within the bearing space.
  • the grease left in the bearing space has a surface which tapers from the drainage hole(s) towards the raceway of the outer ring.
  • the slope of this amount of grease is selected in such a way that the bulk thereof stays in place and will generally not enter the raceway.
  • the oil content however gradually bleeds into the raceway, thus ensuring a long term, stable lubrication of the bearing.
  • the radial position of the drainage holes may be selected in dependence of the nominal rotational speed of the outer bearing ring. For relatively low speeds the distance of the drainage holes of the outer ring will be selected relatively large. The centrifugal forces in such case are relatively low, which means that a stable grease configuration can be maintained even in case the slope from the drainage holes towards the raceway is relatively steep.
  • the drainage holes should have a smaller distance towards the outer ring.
  • the relatively shallow slope thus obtained offers a stable grease configuration under high rotational speeds.
  • the rotational speeds should be so high that the centrifugal effects caused thereby may influence the grease, and excess grease escapes via the drainage hole.
  • the disc element is connected tightly to the outer ring for preventing leakage of lubricant grease out of the bearing space and the disc element.
  • at least two drainage holes are provided in the disc element, which are regularly spaced in circumferential direction.
  • two disc elements may be provided enclosing the bearing space.
  • the rolling elements may be balls.
  • Such bearing also indicated as a deep groove ball bearing, is fit for relatively high rotational speeds which may induce the required centrifugal effect on the grease as addressed therefore.
  • the invention is also related to a structure comprising a fixed central member as well as a rotatable member, said members being supported with respect to each other by means of at least a rolling element bearing, comprising an outer ring and an inner ring each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements which are in rolling contact with the raceways, lands bordering the raceway of at least the outer ring, and at least one disc element, such as a seal or shield, connected to the outer ring and extending towards the inner ring, the fixed member being connected to the inner ring and the rotatable member being connected to the outer ring.
  • a rolling element bearing comprising an outer ring and an inner ring each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements which are in rolling contact with the raceways, lands bordering the raceway of at least the outer ring, and at least one disc element, such as a seal or shield, connected to the outer ring and extending towards the inner ring
  • the disc element has at least one drainage hole which is located radially inwardly with respect to the land bordering the disc element, for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the rotatable member with the outer ring, and for maintaining a defined amount of grease in the bearing space.
  • Figure 1 shows a bearing according to the invention.
  • Figure 2 shows an enlarged detail of figure 1.
  • Figure 3 shows an enlarged detail of a second embodiment.
  • the rolling element bearing shown in figure 1 comprises an outer ring 1, an inner ring 2 which are provided respectively with a raceway 3, 4, and a series of rolling balls 5.
  • lands 6, 7 have been provided onto the axially outer ends of lands 6 of the outer ring 1 .
  • a shield 8 or seal has been provided onto the axially outer ends of lands 6 of the outer ring 1 .
  • the shield 8 has been connected to the outer ring 1 in such a way that no leakage between said shield 8 and the land 6 of the outer ring can occur.
  • drainage holes 9 have been provided in the shields
  • FIG 2 shows an enlarged detail of figure 1, together with the tapering surface 11 of the amount of grease 10.
  • This embodiment is in particular fit for relatively high rotation speeds of the outer ring 1.
  • the centrifugal forces generated in such case are relatively high, which means that only a relatively shallow slope 11 provides a stable configuration of the amount of grease 10.
  • the drainage holes 12 have been located more radially inward in the shield 13. Thereby, an amount of grease is obtained with a relatively steep slope 15 between the drainage holes 12 and the raceway 3 of the outer ring 1.
  • This slope 15 is stable only under relatively low centrifugal forces, and is thereby only fit for relatively low rotational speeds of the outer ring 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A rolling element bearing comprises an outer ring (1) and an inner ring (2) each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements (5) which are in rolling contact with the raceways, lands (6) bordering the raceway of at least the outer ring, and at least one disc element (8), such as a seal or shield, connected to the outer ring (1) and extending towards the inner ring (2). The disc element (8) has at least one drainage hole (9) which is located radially inwardly with respect to the land (6) bordering the disc element (8), for expelling excess lubricant grease (10) from the bearing space under the influence of centrifugal forces upon rotation of the outer ring (1), and for maintaining a defined amount of grease (10) in the bearing space.

Description

Bearing with grease dosing.
The invention is related to a rolling element bearing, comprising an outer ring and an inner ring each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements which are in rolling contact with the raceways, lands bordering the raceway of at least the outer ring, and at least one disc element, such as a seal or shield, connected to the outer ring and extending towards the inner ring.
Such bearing is known from US-A-5348402. The outer ring of this prior art bearing has tapering lands, which promote a flow of lubricant towards the raceway of said ring upon rotation thereof.
The lubricant, generally a grease, is driven towards the raceway under the influence of centrifugal forces which occur upon rotation of the outer ring. This effect is greatly dependent on the rotational speed of the outer ring. As a result a large amount of grease is forced towards the raceway in cases where said rotational speed is high. Such large amount of grease however impairs the proper function of the bearing, and leads to unacceptable high resistance and temperature increases.
The object of the invention is to provide a rolling element bearing wherein the amount of lubricant dosed into the raceway of the rotating outer ring can be controlled more efficiently. This object is achieved in that the disc element has at least one drainage hole which is located radially inwardly with respect to the land bordering the disc element, for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the outer ring, and for maintaining a defined amount of grease in the bearing space. In the bearing according to the invention, grease is forced towards the lands of the outer ring, as occurs in the prior art bearings. However, any excess of grease may escape through the drainage holes, in such a way that a limited amount of grease remains within the bearing space. Typically, the grease left in the bearing space has a surface which tapers from the drainage hole(s) towards the raceway of the outer ring. The slope of this amount of grease is selected in such a way that the bulk thereof stays in place and will generally not enter the raceway. The oil content however gradually bleeds into the raceway, thus ensuring a long term, stable lubrication of the bearing. The radial position of the drainage holes may be selected in dependence of the nominal rotational speed of the outer bearing ring. For relatively low speeds the distance of the drainage holes of the outer ring will be selected relatively large. The centrifugal forces in such case are relatively low, which means that a stable grease configuration can be maintained even in case the slope from the drainage holes towards the raceway is relatively steep.
For higher nominal rotational speeds of the outer ring, the drainage holes should have a smaller distance towards the outer ring. The relatively shallow slope thus obtained offers a stable grease configuration under high rotational speeds. However, in any case the rotational speeds should be so high that the centrifugal effects caused thereby may influence the grease, and excess grease escapes via the drainage hole.
The disc element is connected tightly to the outer ring for preventing leakage of lubricant grease out of the bearing space and the disc element. Preferably, at least two drainage holes are provided in the disc element, which are regularly spaced in circumferential direction.
Furthermore, two disc elements may be provided enclosing the bearing space.
The rolling elements may be balls. Such bearing, also indicated as a deep groove ball bearing, is fit for relatively high rotational speeds which may induce the required centrifugal effect on the grease as addressed therefore.
The invention is also related to a structure comprising a fixed central member as well as a rotatable member, said members being supported with respect to each other by means of at least a rolling element bearing, comprising an outer ring and an inner ring each provided with a raceway facing the other ring and defining a bearing space accommodating rolling elements which are in rolling contact with the raceways, lands bordering the raceway of at least the outer ring, and at least one disc element, such as a seal or shield, connected to the outer ring and extending towards the inner ring, the fixed member being connected to the inner ring and the rotatable member being connected to the outer ring. According to the invention, the disc element has at least one drainage hole which is located radially inwardly with respect to the land bordering the disc element, for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the rotatable member with the outer ring, and for maintaining a defined amount of grease in the bearing space.
Reference is made to US-A-4440401, US-A-4428630, and US-A-4566811, all related to seal arrangements having holes for discharging excess lubricant upon relubricating the bearing. The bearings in question are low speed wheel bearings, which are not exposed to important centrifugal effects. The grease in the bearing will thus not be influenced by centrifugal effects either.
The invention will further be described with reference to the embodiments shown in the figures. Figure 1 shows a bearing according to the invention.
Figure 2 shows an enlarged detail of figure 1. Figure 3 shows an enlarged detail of a second embodiment. The rolling element bearing shown in figure 1 comprises an outer ring 1, an inner ring 2 which are provided respectively with a raceway 3, 4, and a series of rolling balls 5.
Axially extending from the raceways 3, 4, lands 6, 7 have been provided. Onto the axially outer ends of lands 6 of the outer ring 1 , a shield 8 or seal has been provided. The shield 8 has been connected to the outer ring 1 in such a way that no leakage between said shield 8 and the land 6 of the outer ring can occur. According to the invention, drainage holes 9 have been provided in the shields
8. As a result thereof, upon rotation of the outer ring 1 the grease 10 will collect on the lands 6 in a tapered fashion, providing the triangular cross-section as shown in figure 1.
Any excess grease has been expelled, due to centrifugal forces, through the drainage holes 9. The amount of grease 10 left provides a gradual flow of oil towards the raceway 3 for lubricating the bearing. Moreover, this amount has been selected such that no lumps of grease will enter the raceway.
Figure 2 shows an enlarged detail of figure 1, together with the tapering surface 11 of the amount of grease 10. This embodiment is in particular fit for relatively high rotation speeds of the outer ring 1. The centrifugal forces generated in such case are relatively high, which means that only a relatively shallow slope 11 provides a stable configuration of the amount of grease 10. In the embodiment of figure 3, the drainage holes 12 have been located more radially inward in the shield 13. Thereby, an amount of grease is obtained with a relatively steep slope 15 between the drainage holes 12 and the raceway 3 of the outer ring 1.
This slope 15 is stable only under relatively low centrifugal forces, and is thereby only fit for relatively low rotational speeds of the outer ring 1.

Claims

Claim
1. Rolling element bearing, comprising an outer ring (1) and an inner ring (2) each provided with a raceway (3, 4) facing the other ring and defining a bearing space accommodating rolling elements (5) which are in rolling contact with the raceways (3, 4), lands (6) bordering the raceway (3) of at least the outer ring (1), and at least one disc element (8, 13), such as a seal or shield, connected to the outer ring (1) and extending towards the inner ring (2), characterized in that the disc element (8,
13) has at least one drainage hole (9, 12) which is located radially inwardly with respect to the land (6) bordering the disc element (8, 13), for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the outer ring (1), and for maintaining a defined amount of grease (10,
14) in the bearing space.
2. Rolling element bearing according to claim 1, wherein the disc element (8,
13) is connected tightly to the outer ring (1) for preventing leakage of lubricant grease out of the bearing space at the junction of the outer ring (1) and the disc element (8, 13).
3. Rolling element bearing according to claim 1 or 2, wherein at least two drainage holes (9, 12) are provided in the disc element (8, 13), which are regularly spaced in circumferential direction.
4. Bearing according to claim 1, 2 or 3 wherein two disc elements (8, 13) have been provided enclosing the bearing space.
5. Bearing according to any of claims 1-4, wherein the rolling elements are balls.
6. Structure comprising a fixed central member as well as a rotatable member, said members being supported with respect to each other by means of at least a rolling element bearing which comprises an outer ring (1) and an inner ring (2) each provided with a raceway (3, 4) facing the other ring and defining a bearing space accommodating rolling elements (5) which are in rolling contact with the raceways (3, 4), lands (6) bordering the raceway (3) of at least the outer ring (1), and at least one disc element (8, 13), such as a seal or shield, connected to the outer ring (1) and extending towards the inner ring (2), the fixed member being connected to the inner ring and the rotatable member being connected to the outer ring, characterized in that the disc element (8, 13) has at least one drainage hole (9, 12) which is located radially inwardly with respect to the land (6) bordering the disc element (8, 13), for expelling excess lubricant grease from the bearing space under the influence of centrifugal forces upon rotation of the rotatable member with the outer ring (1), and for maintaining a defined amount of grease (10, 14) in the bearing space.
PCT/NL1998/000739 1997-12-29 1998-12-28 Bearing with grease dosing WO1999034125A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17882/99A AU1788299A (en) 1997-12-29 1998-12-28 Bearing with grease dosing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1007921 1997-12-29
NL1007921A NL1007921C2 (en) 1997-12-29 1997-12-29 Lower with fat dosage.

Publications (1)

Publication Number Publication Date
WO1999034125A1 true WO1999034125A1 (en) 1999-07-08

Family

ID=19766269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1998/000739 WO1999034125A1 (en) 1997-12-29 1998-12-28 Bearing with grease dosing

Country Status (3)

Country Link
AU (1) AU1788299A (en)
NL (1) NL1007921C2 (en)
WO (1) WO1999034125A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378209B1 (en) * 1999-04-21 2002-04-30 Kabushiki Kaisha Sankyo Seiki Seisakusho Method of producing fluid bearing device
DE102006011978A1 (en) * 2006-03-16 2007-09-20 Schaeffler Kg Directly-lubricated spindle bearing e.g. single-row tapered roller bearing, for machine tool, has inner and outer rings, where air flow via bearing is interrupted and lubricant portion of oil-air-lubricant mixture is reserved
DE102006047847A1 (en) * 2006-10-10 2008-04-17 Schaeffler Kg Ball bearing has reservoir for lubricant, which has outer ring, inner ring and bearing balls, rolling out on associating tracks arranged between outer and inner rings, where reservoir is formed as V-shape in radial section
WO2012052101A1 (en) * 2010-10-18 2012-04-26 Schaeffler Technologies AG & Co. KG Rolling bearing arrangement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58160627A (en) * 1982-03-18 1983-09-24 Nippon Seiko Kk Lubricating device for ball-and-roller bearing
US4428630A (en) * 1982-07-02 1984-01-31 The Timken Company Sealed bearing and self-venting seal therefor
US4440401A (en) * 1982-05-15 1984-04-03 Skf Kugellagerfabriken Gmbh Seal assembly for bearing cups slidable in axial direction in bore
US4566811A (en) * 1984-04-24 1986-01-28 Skf Nova Ab Device for sealing a self-aligning rolling bearing
GB2250066A (en) * 1990-11-22 1992-05-27 Skf Gmbh A seal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58160627A (en) * 1982-03-18 1983-09-24 Nippon Seiko Kk Lubricating device for ball-and-roller bearing
US4440401A (en) * 1982-05-15 1984-04-03 Skf Kugellagerfabriken Gmbh Seal assembly for bearing cups slidable in axial direction in bore
US4428630A (en) * 1982-07-02 1984-01-31 The Timken Company Sealed bearing and self-venting seal therefor
US4566811A (en) * 1984-04-24 1986-01-28 Skf Nova Ab Device for sealing a self-aligning rolling bearing
GB2250066A (en) * 1990-11-22 1992-05-27 Skf Gmbh A seal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 287 (M - 264) 21 December 1983 (1983-12-21) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378209B1 (en) * 1999-04-21 2002-04-30 Kabushiki Kaisha Sankyo Seiki Seisakusho Method of producing fluid bearing device
DE102006011978A1 (en) * 2006-03-16 2007-09-20 Schaeffler Kg Directly-lubricated spindle bearing e.g. single-row tapered roller bearing, for machine tool, has inner and outer rings, where air flow via bearing is interrupted and lubricant portion of oil-air-lubricant mixture is reserved
DE102006047847A1 (en) * 2006-10-10 2008-04-17 Schaeffler Kg Ball bearing has reservoir for lubricant, which has outer ring, inner ring and bearing balls, rolling out on associating tracks arranged between outer and inner rings, where reservoir is formed as V-shape in radial section
WO2012052101A1 (en) * 2010-10-18 2012-04-26 Schaeffler Technologies AG & Co. KG Rolling bearing arrangement

Also Published As

Publication number Publication date
AU1788299A (en) 1999-07-19
NL1007921C2 (en) 1999-06-30

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