CN109681534B

CN109681534B - Oil-lubricated bearing

Info

Publication number: CN109681534B
Application number: CN201811649527.1A
Authority: CN
Inventors: 王东峰; 张振强; 吴素琴; 陈静; 方萍
Original assignee: Luoyang Bearing Research Institute Co Ltd
Current assignee: Luoyang Bearing Research Institute Co Ltd
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2021-01-22
Anticipated expiration: 2038-12-30
Also published as: CN109681534A

Abstract

The invention relates to an oil-lubricated bearing. The oil-lubricated bearing comprises an inner ring and an outer ring, wherein both the inner ring and the outer ring are provided with roller grooves, rollers are arranged in the roller grooves, the inner ring or the outer ring is provided with an oil inlet hole, the bottom of the outer ring is provided with an oil discharge hole, the outer ring is provided with an oil return sealing ring in a sealing manner, one side of the oil return sealing ring, which faces the rollers, is provided with an annular oil return groove for collecting lubricating oil thrown out from the roller grooves, the inner ring is provided with an annular guide surface between the roller grooves and the oil return sealing ring, and the radius of the part, close to the oil return sealing ring. According to the oil-lubricated bearing, the lubricating oil is input through the oil inlet hole to lubricate the bearing, so that the high-speed performance of the bearing can be guaranteed, the lubricating oil thrown out of the roller groove quickly enters the annular oil return groove of the oil return sealing ring under the guidance of the annular guide surface, the heat dissipation efficiency of the bearing is improved, and the lubricating oil is prevented from leaking.

Description

Oil-lubricated bearing

Technical Field

The invention relates to an oil lubricated bearing.

Background

The four-point contact ball bearing has the performance of bearing bidirectional axial thrust and radial thrust, and simultaneously has the characteristics of high speed and flexible rotation because the contact mode is point contact, thereby being widely applied to the fields of robots and aerospace. However, at present, the four-point contact ball bearing is mostly lubricated by grease or oil bath, and the rolling bodies are mostly steel balls, so the high-speed performance is poor.

The application publication number is CN 103790933A's Chinese invention patent application discloses a two half outer lane terminal surface oil groove four point contact ball bearing, and this two half outer lane terminal surface oil groove four point contact ball bearing's roller is restricted in the arc track of inner circle by the holder, and the bearing inner race is split type structure, including left outer lane, right outer lane, and the external diameter of the butt joint mouth of two outer lanes forms right trapezoid groove respectively around bearing a week, and two right trapezoid grooves form the isosceles trapezoid cell body after the butt joint mouth, and the butt joint mouth department offers the lubricating oil hole that leads to in the bearing in the isosceles trapezoid cell body. When the double-half outer ring end surface oil groove four-point contact ball bearing works, lubricating oil is easily thrown out of the bearing, so that the problems of poor sealing effect and environmental pollution exist.

Chinese utility model patent with publication number CN206072132U discloses a double-layer sealing deep groove ball bearing for vibration motor, which comprises a bearing outer ring, a bearing inner ring, a retainer, a roller, and a first sealing ring and a second sealing ring arranged between the bearing outer ring and the bearing inner ring. In order to ensure the high-speed performance of the bearing, the sealing ring and the rotating bearing inner ring are in clearance fit or contact fit and other non-sealing fit modes, so that lubricating oil still flows out through the clearance between the sealing ring and the bearing inner ring to cause the problem of environmental pollution.

Disclosure of Invention

The invention aims to provide an oil-lubricated bearing to solve the problem of environmental pollution caused by easy outflow of lubricating oil in the bearing in the prior art.

In order to achieve the purpose, the oil lubricating bearing adopts the following technical scheme:

oil lubricated bearing, including inner circle, outer lane, all be equipped with the roller slot on inner circle and the outer lane, the roller slot is equipped with the roller, is equipped with the inlet port on inner circle or the outer lane, and the bottom of outer lane is equipped with the oil drain hole, and sealed assembly has between inner circle and the outer lane and with inner circle contact fit or clearance fit's return oil seal circle on the outer lane, return oil seal circle towards one side of roller be equipped with the annular oil gallery of collecting the lubricating oil that throws out in the roller slot, be equipped with the annular guide face that is used for guiding the lubricating oil that the roller slot throws out to the annular oil gallery between roller slot and the return oil seal circle in the inner circle, the radius of the part that the annular guide face is.

According to the oil-lubricated bearing, the lubricating oil is input through the oil inlet hole to lubricate the bearing, so that the high-speed performance of the bearing can be guaranteed, the lubricating oil thrown out of the roller groove quickly enters the annular oil return groove of the oil return sealing ring under the guidance of the annular guide surface, the heat dissipation efficiency of the bearing is improved, and the lubricating oil is prevented from leaking.

Furthermore, in order to better guide the lubricating oil thrown out of the roller grooves into the annular oil return groove of the oil return sealing ring, the annular guide surface is gradually increased in radius from inside to outside in the axial direction.

Further, in order to improve the efficiency of the discharge of the lubricating oil, the outer ring is provided with an oil discharge guide surface which is increased in radius from the inside to the outside in the axial direction and guides the lubricating oil to the oil discharge hole.

Further, for the convenience of processing, the oil return sealing ring comprises an annular main body part, and the oil return groove is arranged to protrude out of the annular main body part.

Further, in order to improve the sealing effect of the bearing, an outer side sealing ring is further arranged on the outer side of the oil return sealing ring, and the outer side sealing ring is in sealing fit with the outer ring and is in contact fit with the inner ring or in clearance fit with the outer ring.

Furthermore, in order to facilitate the sealing installation of the outer side sealing ring and the oil return sealing ring, an L-shaped matching surface in contact fit or clearance fit with the outer side sealing ring is arranged on the inner ring, and/or an L-shaped matching surface in contact fit or clearance fit with the oil return sealing ring is arranged on the inner ring.

Further, in order to enable the bearing to have high-speed performance, the bearing is a four-point contact ball bearing.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an oil-lubricated bearing of the present invention;

FIG. 2 is a schematic view of the upper outer race of the oil-lubricated bearing of FIG. 1;

FIG. 3 is a schematic view of the left half-turn of the upper inner race of the oil-lubricated bearing of FIG. 1;

FIG. 4 is a schematic structural diagram of the outer sealing ring in FIG. 1;

fig. 5 is a schematic structural view of the inner seal ring in fig. 1.

In the figure: 1. an outer ring; 2. an oil return sealing ring; 3. an outer seal ring; 4. a right half inner ring; 5. an oil inlet hole; 6. a roller; 7. a holder; 8. a left half inner ring; 9. an oil drain hole; 10. an outer ring roller groove; 11. an outer seal groove; 12. an inner seal groove; 13. an oil discharge guide surface; 14. an annular guide surface; 15. an inner L-shaped mating surface; 16. an outer L-shaped mating surface; 17. a left half inner ring roller groove; 18. an outer seal ring pressure relief groove; 19. an outer seal ring seal lip; 22. the outer side sealing ring seals the clamping groove; 23. an outer seal ring inner lip; 24. an oil return sealing ring pressure reduction groove; 25. an annular oil return groove; 26. a seal lip of an oil return seal ring; 27. the upper part of the outer ring; 28. the lower part of the outer ring; 29. an annular body portion.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. The following terms of orientation, up, down, horizontal, etc., are used to describe the bearing in use with its axis extending horizontally. The front, back, left and right in the following are based on the orientation in the drawing for the purpose of convenience in describing the relative positional relationship of the structures, but are not limited to the structure.

As shown in fig. 1 to 5, the oil-lubricated bearing of the present invention is a four-point contact ball bearing, and includes an inner ring and an outer ring 1, wherein the outer ring 1 is an integral structure, and the inner ring is a split structure including a left half inner ring 8 and a right half inner ring 4. The inner ring and the outer ring 1 are respectively provided with a roller groove, the roller grooves of the inner ring and the outer ring 1 form a roller path, a roller 6 is arranged in the roller path, and the roller 6 is kept in the roller path through a retainer 7. In this embodiment, the rollers 6 are silicon nitride ceramic balls, and the retainer 7 is made of engineering plastics, such as PEEK, PA46, and the like.

As shown in fig. 1 and 2, the outer ring roller groove 10 is disposed inside the outer ring 1, the oil inlet 5 extending along the radial direction of the bearing is disposed at the bottom of the outer ring roller groove 10 of the outer ring upper portion 27, and the lubricating oil enters the inside of the bearing through the oil inlet 5 to lubricate the bearing, so that the bearing can adapt to a high rotation speed. An inner sealing groove 12 is arranged on the left side of an outer ring roller groove 10 of the outer ring 1, an outer sealing groove 11 is further arranged on the left side of the inner sealing groove 12, the inner sealing groove 12 and the outer sealing groove 11 are used for installing corresponding sealing rings, an oil discharge guide surface 13 is further arranged between the inner sealing groove 12 and the outer ring roller groove 10, the radius of the oil discharge guide surface 13 is gradually increased from inside to outside in the axial direction, the intersecting line of the oil discharge guide surface 13 and a radial plane passing through the axis is an inclined straight line, the inclination angle is about 3 degrees, in other embodiments, the inclination angle can also be adjusted as required, for example, the inclination angle can be 1 degree, 4 degrees and. The right side of the outer ring roller groove 10 of the outer ring 1 is also provided with an outer sealing groove and an inner sealing groove. The tank bottom of outer lane roller groove 10 of outer lane lower part 28 is provided with along the radial oil drain hole 9 that extends of bearing, and guide lubricating oil to oil drain hole 9 that oil extraction guide face 13 can be quick discharges the bearing through oil drain hole 9 inside high temperature oil fast and dispels the heat, improves the radiating efficiency. The remaining structure of the outer ring lower portion 28 is symmetrical to the structure of the outer ring upper portion 27 about the axis of the bearing and will not be described.

As shown in fig. 1 and 3, the left half inner ring 8 and the right half inner ring 4 have the same structure, and the left half inner ring roller groove 17 of the left half inner ring 8 and the right half inner ring 4 are butted together to form an inner ring roller groove. The left side of the left half inner ring roller groove 17 of the left half inner ring 8 is provided with: an inner L-shaped mating surface 15 corresponding to the inner seal groove 12, and an outer L-shaped mating surface 16 corresponding to the outer seal groove 11, wherein the inner L-shaped mating surface 15 and the outer L-shaped mating surface 16 are both annular step surfaces provided on the inner ring, and the axial cross section of the annular step surfaces is L-shaped. The left half inner ring 8 is also provided with an annular guide surface 14 which connects the left half inner ring roller groove 17 with the inner L-shaped matching surface 15, the radius of the annular guide surface 14 is gradually increased from inside to outside in the axial direction, the intersecting line of the annular guide surface 14 and the radial plane passing through the axial line is an inclined straight line, the inclination is about 3 degrees, high-temperature lubricating oil in the roller groove can be quickly guided out through the annular guide surface 14, and the heat dissipation efficiency is accelerated. In other embodiments, the inclination angle may be adjusted according to needs, and may be, for example, other angles such as 1 ° and 4 °.

As shown in fig. 1, 4 and 5, the oil-lubricated bearing further includes an oil return seal ring 2 and an outer seal ring 3, both the oil return seal ring 2 and the outer seal ring 3 are rubber seal rings with frameworks, wherein the frameworks are 08 steel plates or similar materials, and the rubber is nitrile rubber or similar materials. The oil return sealing ring 2 comprises an annular main body part 29, an oil return sealing ring pressure reduction groove 24 is formed in the radial outer end of the oil return sealing ring 2, and the radial outer end of the oil return sealing ring 2 is clamped into the inner sealing groove 12 and is tightly matched with the inner sealing groove 12 through the oil return sealing ring pressure reduction groove 24. An oil return sealing ring sealing lip 26 is arranged at the inner end of the oil return sealing ring 2, the oil return sealing ring 2 is in clearance fit with the inner L-shaped matching surface 15 on the left half inner ring 8 through the oil return sealing ring sealing lip 26, the matching clearance is 0-0.05mm during working, external pollutants are prevented from entering the inside of the bearing, and when the matching clearance is 0, the inner L-shaped matching surface and the oil return sealing ring sealing lip 26 are in contact fit. An annular oil return groove 25 for collecting lubricating oil thrown out from the roller groove is further formed in the inner end of the oil return sealing ring 2 in the radial direction and on one side facing the roller 6, the annular oil return groove 25 is arranged to protrude rightwards to form an annular main body part 29, and the radius of the part, close to the oil return sealing ring 2, of the annular guide surface 14 is not smaller than that of the notch of the annular oil return groove 25.

The radially outer end of the outer seal ring 3 is provided with an outer seal ring relief groove 18. The radial outer end of the outer side sealing ring 3 is clamped into the outer sealing groove 11 and is tightly matched with the outer sealing groove 11 through the outer side sealing ring pressure reducing groove 18. An outer sealing ring sealing lip 19 and an outer sealing ring inner lip 23 are arranged at the radial inner end of the outer sealing ring 3, and an outer sealing ring sealing clamping groove 22 is formed between the outer sealing ring sealing lip 19 and the outer sealing ring inner lip 23. The outer seal ring sealing lip 19 and the outer seal ring inner lip 23 are in clearance fit with the outer L-shaped matching surface 16 to prevent external pollutants from entering the inside of the bearing and prevent internal lubricating oil from leaking. When the outer sealing ring sealing lip 19 and the outer L-shaped matching surface 16 work, the matching clearance is 0-0.05mm, so that external pollutants are prevented from entering the inside of the bearing, and when the matching clearance is 0, the inner sealing ring sealing lip 19 and the outer L-shaped matching surface 16 are in contact matching. In order to ensure that the bearing has higher high-speed performance, the matching modes between the outer side sealing ring sealing lip and the oil return sealing ring sealing lip and the corresponding L-shaped matching surface are non-sealing matching.

When the oil-lubricated bearing works, lubricating oil enters the roller groove of the bearing through the oil inlet hole 5, the inner ring rotates along with the rotating shaft and throws the lubricating oil out of the roller groove, the lubricating oil thrown out of the roller groove flows into the annular oil return groove 25 under the guide of the annular guide surface 14, and then the lubricating oil in the annular oil return groove 25 is discharged from the interior of the bearing through the oil discharge hole 9 under the guide of the oil discharge guide surface 13, so that the heat of the bearing is dissipated. The oil-lubricated bearing can well lubricate the bearing to ensure the high-speed performance of the bearing, and the lubricating oil in the bearing cannot leak around to pollute the environment under a good sealing environment during working. The oil lubricating bearing can improve the speed performance and prolong the service life by more than 50 percent, can be used in severe environments such as sand blown by the wind, oil stain and the like, avoids expensive multilayer sealing devices of a host, is sealed and environment-friendly, greatly reduces the host cost, obviously simplifies the host structure and reduces the host cost.

In other embodiments, the line of intersection of the annular guide surface with the radial plane through the axis may be an arc or a horizontal straight line. In other embodiments, the line of intersection of the drain hole guide surface and the radial plane passing through the axis may be a curved line or a horizontal straight line. In other embodiments, the annular oil gallery may also be embedded within the annular body portion. In other embodiments, the outer sealing ring of the bearing can be eliminated, and the bearing is suitable for occasions with low sealing effect requirements. In other embodiments, the oil inlet hole may be further disposed on the inner ring, and at this time, the oil inlet hole needs to be disposed on the adaptive rotating shaft. In other embodiments, the L-shaped mating surface on the inner ring may also be replaced by a mating groove, where the inner ends of the outer seal ring and the oil return seal ring are snapped into the mating groove. In other embodiments, the oil drain guide surface may be omitted, and the lubricating oil is thrown out only by the force of the roller rotation.

Claims

1. Oil lubricated bearing, including inner circle, outer lane, all be equipped with roller slot on inner circle and the outer lane, the roller slot is equipped with the roller, is equipped with the inlet port on inner circle or the outer lane, and the bottom of outer lane is equipped with oil drain hole, its characterized in that: the outer ring is provided with an oil return sealing ring which is positioned between the inner ring and the outer ring and is in contact fit with the inner ring or in clearance fit with the inner ring in a sealing manner, one side of the oil return sealing ring, which faces the roller, is provided with an annular oil return groove for collecting lubricating oil thrown out from the roller groove, the notch of the annular oil return groove faces the outer ring, the inner ring is provided with an annular guide surface which is positioned between the roller groove and the oil return sealing ring and is used for guiding the lubricating oil thrown out from the roller groove to the annular oil return groove, and the radius of the part of the annular guide surface, which.

2. The oil-lubricated bearing according to claim 1, wherein: the annular guide surface increases in radius from the inside to the outside in the axial direction.

3. The oil-lubricated bearing according to claim 1 or 2, wherein: and an oil discharge guide surface which is used for guiding lubricating oil to the oil discharge hole and gradually increases in radius from inside to outside in the axial direction is arranged on the outer ring.

4. The oil-lubricated bearing according to claim 3, wherein: the oil return sealing ring comprises an annular main body part, and the annular oil return groove protrudes out of the annular main body part.

5. The oil-lubricated bearing according to claim 4, wherein: the outside of oil return sealing washer still is equipped with the outside sealing washer, outside sealing washer and outer lane sealed cooperation and with inner circle contact fit or clearance fit.

6. The oil-lubricated bearing according to claim 1, 2 or 4, wherein: the inner ring is provided with an L-shaped matching surface which is in contact fit or clearance fit with the oil return sealing ring.

7. The oil-lubricated bearing according to claim 6, wherein: the bearing is a four-point contact ball bearing.