Rolling bearing

Abstract

A kind of rolling bearing, for improving the situation that rolling bearing axial migration wear leads to unstable operation. Rolling bearing includes inner ring, outer ring, cage, rolling body and anti-migration assembly, cage has axial stable state and axial migration state, anti-migration assembly includes resistance piece, oil channel, first valve piece and first driving mechanism;Resistance piece includes the resistance wall of setting oil reservoir, in axial stable state, resistance wall and the axial gap of the shaft end wall of cage, in axial migration state, the shaft end wall of cage collides and grinds resistance wall, resistance piece is fixed to outer ring;Oil channel includes outlet, outlet is located in the shaft end wall of cage;First valve piece is cut off in first position, and outlet and oil reservoir are communicated in second position;First driving mechanism includes first shape memory alloy component, drives first valve piece in axial stable state to first position, drives first valve piece in axial migration state to second position.

Description

Technical Field

[0001] This invention relates to a rolling bearing. Background Technology

[0002] With the increasing demands for performance and reliability in aero-engines, the design requirements for key aero-engine components are becoming increasingly stringent. Bearings, as a critical component of aero-engines, directly affect the normal operation and reliability of the engine through their reliability and operational stability. Therefore, how to design bearings rationally and scientifically has attracted widespread attention from engine and bearing engineers.

[0003] When the engine is running, under certain operating conditions, the rolling bearing may experience axial movement driven by the shaft. The bearing's outer ring is designed with flanges that rub against the axially moving rolling elements to prevent this movement. However, on the one hand, the end faces of the rolling elements directly rub against the flanges; on the other hand, the rubbing surfaces lack lubrication and cooling, leading to severe wear of the rolling elements and unstable operation of the rolling bearing. Summary of the Invention

[0004] The purpose of this invention is to provide a rolling bearing that improves the situation of unstable operation caused by axial wear in rolling bearings.

[0005] According to an embodiment of the present invention, a rolling bearing includes an inner ring, an outer ring, a cage, rolling elements, and an anti-runaway assembly. The cage has an axially stable state and an axially runaway state. The anti-runaway assembly includes a stop member, an oil passage, a first valve member, and a first drive mechanism. The stop member includes a stop wall with an oil reservoir. In the axially stable state, the stop wall has an axial clearance with the end wall of the cage. In the axially runaway state, the end wall of the cage abrades against the stop wall. The stop member is fixed to the outer ring. The oil passage includes an outlet located on the end wall of the cage. The first valve member has a first position and a second position. In the first position, the first valve member isolates the outlet from the oil reservoir. In the second position, the first valve member connects the outlet to the oil reservoir. The first drive mechanism includes a first shape memory alloy component, which drives the first valve member to the first position in the axially stable state and to the second position in the axially runaway state.

[0006] In one or more embodiments, the first shape memory alloy component includes a first shape memory alloy rod, the first shape memory alloy rod being connected to the first valve at its rod end, the first shape memory alloy rod having a first rod length in the axially stable state, the first shape memory alloy rod having a second rod length in the axially undulating state, and the first rod length being greater than the second rod length.

[0007] In one or more embodiments, the first drive mechanism and the first valve are located on the stop member, in the first position the first valve blocks the outlet, and in the second position the first valve opens the outlet.

[0008] In one or more embodiments, the first shape memory alloy rod extends axially, the first valve is located on the inner circumferential side of the oil reservoir, in the first position, the axial end wall of the first valve is axially flush with the abutment wall, and in the second position, the axial end wall of the first valve is axially flush with the axial end wall of the oil reservoir.

[0009] In one or more embodiments, the abutment is fixed to the outer ring by the mounting member, the mounting member protruding axially outward from the axial end wall of the outer ring and having an axial distance from the axial end wall of the outer ring.

[0010] In one or more embodiments, the abutment is fixed to the outer ring by the mounting member; the mounting member includes a fixing groove, the fixing groove including an interconnected shaft end wall and an arcuate side wall, the arcuate side wall of the fixing groove protruding from the shaft end wall of the outer ring, and the shaft end wall of the fixing groove being spaced apart from the shaft end wall of the outer ring; the mounting member further includes a fixing block connecting the abutment, the two shaft end walls of the fixing block respectively abutting the shaft end wall of the fixing groove and the shaft end wall of the outer ring, and the arcuate side wall of the fixing block abutting the arcuate side wall of the fixing groove.

[0011] In one or more embodiments, the oil passage includes a cage oil passage comprising a first section and a second section; the first section extends from an inlet on the inner peripheral wall of the cage toward the outer peripheral side and communicates with the second section; the second section extends to the axial end wall of the cage, and the outer peripheral sidewall of the second section slopes toward the outer peripheral side as it extends, the second section providing an outlet for the oil passage.

[0012] In one or more embodiments, the oil passage includes an inner ring oil passage extending from an inlet on the inner peripheral wall of the inner ring to an outlet on the outer peripheral wall of the inner ring; a second valve is provided at the outlet of the inner ring oil passage, the second valve having a third position and a fourth position, wherein in the third position, the second valve blocks the outlet of the inner ring oil passage, and in the fourth position, the second valve opens the outlet of the inner ring oil passage; the second valve is configured with a second drive mechanism, the second drive mechanism including a second shape memory alloy member, driving the second valve from a stopped state of the rolling bearing to the third position, and driving the second valve from an operating state of the rolling bearing to the fourth position.

[0013] In one or more embodiments, the second shape memory alloy member extends along a length direction, one end of the second shape memory alloy member in the length direction is connected to the second valve member, the second shape memory alloy member has a first length in the stopped state of the rolling bearing, the second shape memory alloy member has a second length in the running state of the rolling bearing, and the first length is greater than the second length.

[0014] In one or more embodiments, the second valve and the second shape memory alloy component are integral components.

[0015] The embodiments of the present invention have at least the following beneficial effects:

[0016] 1. The retaining wall blocks the shaft end wall of the cage, suppressing the axial movement of the cage, thereby suppressing the axial movement of the rolling bearing, reducing rolling element wear, reducing failures, and extending the service life of the rolling bearing.

[0017] 2. When the temperature of the cage and the stop changes from the higher temperature of the axially unstable state to the lower temperature of the axially stable state, the first shape memory alloy component deforms and drives the first valve to the first position, cutting off the oil passage outlet and the oil reservoir, thus saving lubricating oil. When the temperature of the cage and the stop changes from the lower temperature of the axially stable state to the higher temperature of the axially unstable state, the first shape memory alloy component deforms and drives the first valve to the second position. The lubricating oil flowing out of the oil passage outlet flows into the oil reservoir, lubricating the axial end wall of the cage and the stop wall that are rubbing against each other, reducing wear, reducing failures, and extending the service life of the rolling bearing. Attached Figure Description

[0018] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a sectional view of a rolling bearing, shaft, and oil catch ring.

[0020] Figure 2 for Figure 1 Half of;

[0021] Figure 3 for Figure 2 A partial view;

[0022] Figure 4 for Figure 3 A partial view;

[0023] Figure 5 for Figure 2 A partial view;

[0024] Figure 6 This is a front view of the anti-slip component;

[0025] Figure 7 This is a front view of the blocking component.

[0026] Figure label:

[0027] 1-Inner circle;

[0028] 2-Outer ring;

[0029] 3-Cage;

[0030] 4-Rolling element;

[0031] 5-Anti-movement components;

[0032] 6-Spindle;

[0033] 7-Oil recovery ring;

[0034] 8-Blocking component;

[0035] 9-Resistant wall;

[0036] 10-Oil storage tank;

[0037] 11-Oil passage;

[0038] 12 - Oil outlet;

[0039] 13-First valve component;

[0040] 14-First drive mechanism;

[0041] 15 - First shape memory alloy component;

[0042] 16-First shape memory alloy rod;

[0043] 17-Mounting slot;

[0044] 18-Installation components;

[0045] 19-Fixing slot;

[0046] 20 - The end wall of the fixed groove;

[0047] 21- The curved sidewall of the fixing groove;

[0048] 22-Fixed block;

[0049] 23- Bolt;

[0050] 24-Diagonal brace;

[0051] 25-ring;

[0052] 26-Right-angle bar;

[0053] 27 - Cage oil passage;

[0054] 28 - The first section of the cage oil passage;

[0055] 29 - The second section of the cage oil passage;

[0056] 30 - Inner ring oil passage;

[0057] 31-Second valve component;

[0058] 32-Second drive mechanism;

[0059] 33 - Second shape memory alloy component;

[0060] 34- Annular oil groove;

[0061] 35 - Tightening ring. Detailed Implementation

[0062] Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0063] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0064] The terms “first”, “second”, etc., are used interchangeably to distinguish one feature from another and are not intended to indicate that each feature must be located in the position shown in the figure in each embodiment.

[0065] like Figure 1 and Figure 2As shown, the rolling bearing includes an inner ring 1, an outer ring 2, a cage 3, rolling elements 4, and an anti-runaway assembly 5. The inner ring 1 is fitted onto and fixed to the shaft 6. The rolling elements 4 are located in the grooves of the inner ring 1 and in the pockets of the cage 3. The rolling elements 4 can be cylindrical rolling elements. An oil catch ring 7 can be configured on one side of the inner ring 1, which is fitted onto and fixed to the shaft 6. The cage 3 has an axially stable state and an axially runaway state. When the shaft 6 runs axially, the shaft 6 drives the inner ring 1 to run axially, the inner ring 1 drives the rolling elements 4 to run axially, and the rolling elements 4 drive the cage 3 to run axially, so the cage 3 is in an axially runaway state. When the shaft 6 does not run axially, the inner ring 1 is basically stationary axially, and its axial position is stable; the rolling elements 4 are basically stationary axially, and their axial positions are stable; the cage 3 is basically stationary axially, and its axial position is stable, so the cage 3 is in an axially stable state.

[0066] like Figure 3 and Figure 4 , Figure 6 and Figure 7 As shown, the anti-runaway assembly 5 includes a stopper 8. The stopper 8 has a stopper wall 9 facing the shaft end wall of the cage 3. The stopper wall 9 can be a straight wall, used to stop the straight shaft end wall of the cage 3. When the cage 3 is in an axially stable state, there is an axial clearance between the stopper wall 9 and the shaft end wall of the cage 3. When the cage 3 is in an axially runaway state, the shaft end wall of the cage 3 rubs against the stopper wall 9, and the stopper wall 9 blocks the shaft end wall of the cage 3, suppressing the axial runaway of the cage 3, thereby suppressing the axial runaway of the rolling bearing, reducing the wear of the rolling elements 4, reducing failures, and improving the service life of the rolling bearing.

[0067] like Figure 3 As shown, the stopper 8 is fixed to the outer ring 2 to withstand the axial impact of the cage 3. Details are described later.

[0068] like Figure 4 and Figure 7 As shown, the abutment wall 9 is provided with an oil reservoir 10. The oil reservoir 10 is a shallow groove formed by the recess of the abutment wall 9, facing the shaft end wall of the cage 3.

[0069] like Figure 4 As shown, the anti-slip assembly 5 also includes an oil passage 11 for supplying lubricating oil to the oil reservoir 10. The outlet 12 of the oil passage 11 is located on the shaft end wall of the cage 3, and the lubricating oil in the oil passage 11 flows to the oil reservoir 10 through the outlet 12.

[0070] like Figure 4As shown, the anti-slip assembly 5 also includes a first valve 13 for controlling the flow of lubricating oil from the outlet 12 of the oil passage 11 to the oil reservoir 10. The first valve 13 has a first position and a second position. In the first position, the first valve 13 isolates the outlet 12 of the oil passage 11 from the oil reservoir 10, preventing the lubricating oil flowing out of the outlet 12 of the oil passage 11 from flowing into the oil reservoir 10. In the second position, the first valve 13 connects the outlet 12 of the oil passage 11 to the oil reservoir 10, allowing the lubricating oil flowing out of the outlet 12 of the oil passage 11 to flow into the oil reservoir 10.

[0071] like Figure 4 As shown, the first valve 13 is configured with a first drive mechanism 14. The first drive mechanism 14 includes a first shape memory alloy component 15, which drives the first valve 13 to a first position in an axially stable state and to a second position in an axially undulating state. In the axially stable state, the retainer 3 does not rub against the abutment 8, and no frictional heat is generated, resulting in a lower temperature for the retainer 3 and the abutment 8. In the axially undulating state, the retainer 3 rubs against the abutment 8, generating frictional heat, resulting in a higher temperature for the retainer 3 and the abutment 8. The first shape memory alloy component 15 has a shape memory effect, and temperature changes cause the first shape memory alloy component 15 to deform. When the temperature of the retainer 3 and the abutment 8 changes from the higher temperature of the axially undulating state to the lower temperature of the axially stable state, the first shape memory alloy component 15 deforms and drives the first valve 13 to the first position, disconnecting the outlet 12 of the oil passage 11 from the oil reservoir 10, saving lubricating oil. The oil reservoir 10 can also store lubricating oil for the next lubrication. When the temperature of the cage 3 and the stop 8 changes from the lower temperature of the axially stable state to the higher temperature of the axially undulating state, the first shape memory alloy component 15 deforms and drives the first valve component 13 to the second position. The lubricating oil flowing out through the outlet 12 of the oil passage 11 flows into the oil reservoir 10, lubricating the shaft end wall of the cage 3 and the stop wall 9 that are rubbing against each other. During the rubbing, the shaft end wall of the cage 3 and the stop wall 9 constantly change between axial clearance and close contact. The lubricating oil in the oil reservoir 10 is squeezed and flows to the outside, carrying away heat, cooling the cage 3 and the stop 8, reducing wear, reducing failures, and improving the service life of the rolling bearing.

[0072] like Figure 4As shown, the first shape memory alloy component 15 can be a first shape memory alloy rod 16. The first shape memory alloy rod 16 is connected to a first valve 13 at its end, and the first shape memory alloy rod 16 and the first valve 13 can be welded. The first shape memory alloy rod 16 contracts along its length when the temperature rises and extends along its length when the temperature falls, thus having a longer first rod length in the axially stable state, causing the first valve 13 to be separated from the oil passage 11 outlet 12 and the oil reservoir 10 in a first position, and thus having a shorter second rod length in the axially undulating state, causing the first valve 13 to withdraw from the oil passage 11 outlet 12 and the oil reservoir 10 in a second position, releasing the separation and thus connecting the oil passage 11 outlet 12 and the oil reservoir 10. The first rod length is greater than the second rod length. The first shape memory alloy rod 16 can be made of nickel-titanium alloy.

[0073] like Figure 4 As shown, the first drive mechanism 14 and the first valve 13 can be disposed on the stop member 8. The temperature of the stop member 8 increases or decreases, causing the first shape memory alloy rod 16 to contract and extend. In the axially stable state, the temperature of the stop member 8 is lower, and the first shape memory alloy rod 16 has a longer first rod length. The first valve 13 blocks the outlet 12 of the oil passage 11 in the first position, thereby isolating the outlet 12 of the oil passage 11 from the oil reservoir 10. In the axially axial movement state, the temperature of the stop member 8 is higher, and the first shape memory alloy rod 16 has a shorter second rod length. The first valve 13 retracts, releasing the obstruction of the outlet 12 of the oil passage 11. The first valve 13 opens the outlet 12 of the oil passage 11 in the second position, thereby connecting the outlet 12 of the oil passage 11 with the oil reservoir 10.

[0074] like Figure 4 As shown, the first shape memory alloy rod 16 can extend axially. The first shape memory alloy rod 16 can be disposed within the mounting groove 17 of the abutment 8 and fixed at one end to the groove wall of the mounting groove 17, such as by welding the groove wall to that end. The first shape memory alloy rod 16 is connected to the first valve member 13 at the other end. Further integration... Figure 7The first valve 13 can be disposed on the inner circumference of the oil reservoir 10, aligned with the outlet 12 of the oil passage 11, which is also located on the inner circumference of the oil reservoir 10. Lubricating oil flowing out of the outlet 12 of the oil passage 11 can flow into the oil reservoir 10 under centrifugal force. In the first position, the axial end wall of the first valve 13 is axially flush with the abutment wall 9, blocking the outlet 12 of the oil passage 11, thereby isolating the outlet 12 of the oil passage 11 from the oil reservoir 10. In the second position, the axial end wall of the first valve 13 is axially flush with the axial end wall of the oil reservoir 10, opening the outlet 12 of the oil passage 11, thus connecting the outlet 12 of the oil passage 11 with the oil reservoir 10. Furthermore, the first valve 13 moves from the first position to the second position, retracting to create space communicating with the oil reservoir 10, which is also available for lubricating oil, further expanding the oil supply area of ​​the abutment wall 9. In the illustrated embodiment, the first valve 13 may be disposed in the mounting groove 17. The first valve 13 moves from the first position to the second position, retracting part of the space in the mounting groove 17, and communicates with the oil storage tank 10.

[0075] like Figure 6 and Figure 7 As shown, the blocking member 8 can be a fan-shaped baffle. The anti-slip assembly 5 can have four blocking members 8 arranged circumferentially, evenly distributed circumferentially, with a circumferential interval of 90° between every two blocking members 8. Further integration... Figure 3 The stop 8 can be located at the center of the radial height of the cage 3, and the radial height of the stop 8 can be one-third of the radial height of the cage 3.

[0076] like Figure 3As shown, the stop 8 can be fixed to the outer ring 2 by the mounting member 18. The mounting member 18 may include a fixing groove 19. The fixing groove 19 includes an end wall 20 and an arcuate side wall 21 connected to each other. The arcuate side wall 21 of the fixing groove 19 protrudes from the end wall of the outer ring 2. The arcuate side wall 21 of the fixing groove 19 may protrude axially. The arcuate side wall 21 of the fixing groove 19 may have a partially elliptical profile. The end wall 20 of the fixing groove 19 is spaced from the end wall of the outer ring 2. The end wall 20 of the fixing groove 19 may be perpendicular to the axial direction and have a uniform axial distance from the end wall of the outer ring 2 perpendicular to the axial direction. The fixing groove 19 may be welded to the outer ring 2. The mounting member 18 may also include a fixing block 22 for connecting the stop 8. The fixing block 22 is located within the gap between the shaft end wall 20 of the fixing groove 19 and the shaft end wall of the outer ring 2. The two shaft end walls of the fixing block 22 respectively abut against the shaft end wall 20 of the fixing groove 19 and the shaft end wall of the outer ring 2, thereby positioning and limiting the fixing block 22 axially, and the abutment 8 is also positioned and limited axially. Both shaft end walls of the fixing block 22 may be perpendicular to the axial direction. The arc-shaped side wall of the fixing block 22 abuts against the arc-shaped side wall 21 of the fixing groove 19, thereby positioning and limiting the fixing block 22 radially, and the abutment 8 is also positioned and limited radially. The arc-shaped side wall of the fixing block 22 may have an elliptical profile. The fixing block 22 and the fixing groove 19 may be fixed by bolts 23, which connect the arc-shaped side wall of the fixing block 22 to the arc-shaped side wall 21 of the fixing groove 19.

[0077] like Figure 3 As shown, the mounting member 18 can protrude axially outward from the shaft end wall of the outer ring 2, and is axially spaced from the shaft end wall of the outer ring 2. Further integration Figure 6 The mounting component 18 may also include a diagonal bar 24, a ring 25, and a right-angle bar 26. The diagonal bar 24 extends obliquely outward from the fixing block 22 and connects to the ring 25. Each stopper 8 is equipped with a fixing groove 19, a fixing block 22, and a diagonal bar 24 connected to the ring 25. The right-angle bar 26 includes an axially extending first segment and a radially extending second segment, which are interconnected. The first segment connects to the end wall of the stopper 8, and the second segment connects to the ring 25. Each stopper 8 is equipped with a right-angle bar 26 connected to the ring 25. The first segments of the diagonal bar 24 and the right-angle bar 26 protrude axially outward, thereby creating an axial gap between the ring 25 and the end wall of the outer ring 2, preventing interference with other structures of the rolling bearing.

[0078] like Figure 4As shown, the oil passage 11 may include a cage oil passage 27. The cage oil passage 27 includes a first section 28 and a second section 29. The first section 28 extends from an inlet on the inner peripheral wall of the cage 3 to the outer peripheral side and connects to the second section 29, such that when the rolling bearing is in operation, under the action of centrifugal force, lubricating oil flows through the cage oil passage 27 from the inlet on the inner peripheral wall of the cage 3 to the outer peripheral side and enters the second section 29. The first section 28 may extend radially. The second section 29 extends to the shaft end wall of the cage 3, providing an outlet 12 for the oil passage 11. As the second section 29 extends from the first section 28 to the shaft end wall of the cage 3, the outer peripheral wall of the second section 29 is inclined to the outer peripheral side, such that when the rolling bearing is in operation, under the action of centrifugal force, lubricating oil flows along the inclined outer peripheral wall of the second section 29 to the outlet 12 of the oil passage 11. The second section 29 may extend axially.

[0079] like Figure 5 As shown, the oil passage 11 may further include an inner ring oil passage 30. The inner ring oil passage 30 extends from the inlet of the inner peripheral wall of the inner ring 1 to the outlet of the outer peripheral wall of the inner ring 1, so that during the operation of the rolling bearing, under the action of centrifugal force, the lubricating oil on the inner peripheral wall of the inner ring 1 flows from the inlet of the inner ring oil passage 30 to the outer peripheral side and then to the outlet of the inner ring oil passage 30. The outlet of the inner ring oil passage 30 is aligned with the inlet of the cage oil passage 27, so that during the operation of the rolling bearing, under the action of centrifugal force, the lubricating oil is flung from the outlet of the inner ring oil passage 30 to the inlet of the cage oil passage 27. The inner ring oil passage 30 may extend radially.

[0080] like Figure 5 As shown, a second valve 31 can be installed at the outlet of the inner ring oil passage 30. An annular oil groove 34 can be provided on the outer peripheral wall of the inner ring 1, and each inner ring oil passage 30 configured with the stopper 8 is connected to the annular oil groove 34. The second valve 31 and the second drive mechanism 32 (described later) can be disposed within the annular oil groove 34. The second valve 31 has a third position and a fourth position. In the third position, the second valve 31 blocks the outlet of the inner ring oil passage 30, preventing the lubricating oil in the inner ring oil passage 30 from being ejected through the outlet. In the fourth position, the second valve 31 opens the outlet of the inner ring oil passage 30, allowing the lubricating oil in the inner ring oil passage 30 to be ejected through the outlet to the inlet of the cage oil passage 27.

[0081] like Figure 5As shown, the second valve 31 is configured with a second drive mechanism 32. The second drive mechanism 32 includes a second shape memory alloy component 33, which drives the second valve 31 from the stopped state of the rolling bearing to the third position, and from the running state of the rolling bearing to the fourth position. In the stopped state of the rolling bearing, the rolling element 4 is stationary in the inner ring 1, and does not generate heat through friction, resulting in a lower temperature for the inner ring 1. In the running state of the rolling bearing, the rolling element 4 rolls in the inner ring 1, generating heat through friction, resulting in a higher temperature for the inner ring 1. The second shape memory alloy component 33 has a shape memory effect, and temperature changes cause the second shape memory alloy component 33 to deform. When the temperature of the inner ring 1 changes from the higher temperature in the running state of the rolling bearing to the lower temperature in the stopped state of the rolling bearing, the second shape memory alloy component 33 deforms and drives the second valve 31 to the third position, blocking the outlet of the inner ring oil passage 30 and saving lubricating oil. When the temperature of the inner ring 1 changes from the lower temperature of the rolling bearing in the stopped state to the higher temperature of the rolling bearing in the running state, the second shape memory alloy component 33 deforms and drives the second valve 31 to the fourth position. The lubricating oil in the inner ring oil passage 30 is thrown from the outlet of the inner ring oil passage 30 to the inlet of the cage oil passage 27, supplying lubricating oil to the cage oil passage 27, cooling and dissipating the heat of the cage 3, and finally supplied by the cage oil passage 27 to the shaft end wall and the abutment wall 9 of the cage 3 that are rubbing against each other.

[0082] like Figure 5 As shown, the second shape memory alloy component 33 extends along its length. The second shape memory alloy component 33 can be a tension ring 35, which extends axially, with its length direction parallel to the axial direction. A second valve component 31 is connected to one end of the second shape memory alloy component 33 along its length. The tension ring 35 is connected to the second valve component 31 at one end along its axial direction. The second valve component 31 and the second shape memory alloy component 33 can be an integral component. The second valve component 31 can be provided by the tension ring 35, and the second valve component 31 is the axial end of the tension ring 35. The wall of the annular oil groove 34 can be welded to the other end of the tension ring 35 along its axial direction. The second shape memory alloy component 33 has a first length in the stationary state of the rolling bearing and a second length in the operating state of the rolling bearing; the first length is greater than the second length. The tension ring 35 contracts along its length when the temperature rises and extends along its length when the temperature falls, thus having a longer first length in the rolling bearing's stationary state, causing the second valve 31 to block the outlet of the inner ring oil passage 30 in the third position, and thus having a shorter second length in the rolling bearing's operating state, causing the second valve 31 to open the outlet of the inner ring oil passage 30 in the fourth position. The tension ring 35 may be made of a nickel-titanium alloy.

[0083] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A rolling bearing, characterized in that, It includes an inner ring, an outer ring, a cage, rolling elements, and an anti-migration assembly. The cage has an axially stable state and an axially misaligned state. The anti-migration assembly includes: The abutment includes an abutment wall with an oil reservoir. In the axially stable state, the abutment wall has an axial gap with the shaft end wall of the cage. In the axially moving state, the shaft end wall of the cage rubs against the abutment wall. The abutment is fixed to the outer ring. The oil passage includes an outlet located on the shaft end wall of the cage; A first valve has a first position and a second position. In the first position, the first valve isolates the outlet from the oil reservoir. In the second position, the first valve connects the outlet to the oil reservoir. The first driving mechanism includes a first shape memory alloy component, which drives the first valve to the first position in the axially stable state and drives the first valve to the second position in the axially undulating state.

2. The rolling bearing according to claim 1, characterized in that: The first shape memory alloy component includes a first shape memory alloy rod, the first shape memory alloy rod is connected to the first valve at the rod end, the first shape memory alloy rod has a first rod length in the axially stable state, the first shape memory alloy rod has a second rod length in the axially undulating state, and the first rod length is greater than the second rod length.

3. The rolling bearing according to claim 2, characterized in that: The first drive mechanism and the first valve are located on the stop member. In the first position, the first valve blocks the outlet, and in the second position, the first valve opens the outlet.

4. The rolling bearing according to claim 3, characterized in that: The first shape memory alloy rod extends axially, and the first valve is located on the inner circumference of the oil reservoir. In the first position, the axial end wall of the first valve is axially flush with the abutment wall. In the second position, the axial end wall of the first valve is axially flush with the axial end wall of the oil reservoir.

5. The rolling bearing according to claim 1, characterized in that: The abutment is fixed to the outer ring by the mounting member, which protrudes axially from the shaft end wall of the outer ring and is axially spaced from the shaft end wall of the outer ring.

6. The rolling bearing according to claim 1, characterized in that: The blocking component is fixed to the outer ring by the mounting component; The mounting component includes a fixing groove, which includes an interconnected shaft end wall and an arcuate side wall. The arcuate side wall of the fixing groove protrudes from the shaft end wall of the outer ring, and the shaft end wall of the fixing groove is spaced from the shaft end wall of the outer ring. The mounting component also includes a fixing block that connects to the abutment. The two shaft end walls of the fixing block are respectively attached to the shaft end wall of the fixing groove and the shaft end wall of the outer ring, and the arc-shaped side wall of the fixing block is attached to the arc-shaped side wall of the fixing groove.

7. The rolling bearing according to claim 1, characterized in that: The oil passage includes a cage oil passage, which includes a first section and a second section; The first segment extends from the inlet on the inner peripheral wall of the cage to the outer peripheral side and connects to the second segment; The second segment extends to the shaft end wall of the cage, and the outer peripheral sidewall of the second segment slopes outwards as it extends, and the second segment provides the outlet of the oil passage.

8. The rolling bearing according to claim 1, characterized in that: The oil passage includes an inner ring oil passage that extends from an inlet on the inner peripheral wall of the inner ring to an outlet on the outer peripheral wall of the inner ring. The inner ring oil passage is provided with a second valve at the outlet. The second valve has a third position and a fourth position. In the third position, the second valve blocks the outlet of the inner ring oil passage. In the fourth position, the second valve opens the outlet of the inner ring oil passage. The second valve is configured with a second drive mechanism, which includes a second shape memory alloy component. The second drive mechanism drives the second valve from the stopped state of the rolling bearing to the third position, and drives the second valve from the running state of the rolling bearing to the fourth position.

9. The rolling bearing according to claim 8, characterized in that: The second shape memory alloy component extends along the length direction, and one end of the second shape memory alloy component in the length direction is connected to the second valve component. The second shape memory alloy component has a first length in the stopped state of the rolling bearing and a second length in the running state of the rolling bearing. The first length is greater than the second length.

10. The rolling bearing according to claim 9, characterized in that: The second valve and the second shape memory alloy component are an integral component.

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