Vehicle hub bearing assembly

Abstract

The invention relates to the technical field of bearings, and discloses a vehicle hub bearing assembly which comprises a bearing seat, a bearing outer ring, a bearing inner ring, balls and a retainer, the bearing outer ring is fixedly connected with the bearing seat, two inner slideways are arranged on the inner wall of the bearing outer ring, two outer slideways are arranged on the outer side of the bearing inner ring, and the balls are distributed along the outer side of the bearing inner ring. The ball is located between the outer slide way and the inner slide way, the retainer is arranged on the outer side of the ball, and a sealing ring is arranged between the bearing outer ring and the bearing inner ring; in the rotating process of the bearing inner ring, due to the fact that friction of the bearing inner ring is aggravated due to reduction of lubricating oil, the temperature of the bearing inner ring is increased, the plugging assembly can automatically open the oil outlet pipe under the action of heat, and the feeding assembly can extrude the lubricating oil in the oil groove under the action of centrifugal force; and therefore, the lubricating oil in the oil storage tank can be conveyed to the oil outlet from the oil outlet pipe, and oil supplementing operation can be carried out in time when bearing lubrication fails.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a vehicle wheel hub bearing assembly. BACKGROUND

[0002] The vehicle wheel hub bearing assembly is a key component connecting the vehicle wheel and the vehicle body, mainly used for bearing and accurately guiding the rotation of the wheel hub. It is usually composed of inner and outer ring bearings, rolling elements, sealing elements, sensors, etc. The inner and outer ring bearings are the core, the inner ring is connected with the axle, and the outer ring is connected with the wheel hub; the rolling elements are steel balls or rollers, which can reduce friction; the sealing elements prevent external dust and water from entering; the sensors are used to monitor the wheel speed and provide data for the ABS system.

[0003] The existing vehicle bearings need to fill lubricating medium in the contact interface between the inner and outer ring raceways and the rolling elements (balls / rollers) during operation to form a lubricating film, reduce the friction coefficient and inhibit wear. However, as the bearing is used for a long time, the lubricating medium will be reduced due to wear, which will cause the friction to increase and the temperature to rise abnormally during the rotation of the inner ring, eventually resulting in abnormal noise and increased rolling resistance of the bearing. The current traditional bearings still rely on manual regular greasing / oiling, which has the problem of oiling lag, and is easy to cause premature damage of the bearing due to lubrication failure, affecting the overall operation reliability of the equipment.

[0004] Therefore, the skilled person in the art proposes a vehicle wheel hub bearing assembly to solve the problems raised in the above background. SUMMARY

[0005] The purpose of the present application is to provide a vehicle wheel hub bearing assembly to solve the problems raised in the above background.

[0006] To achieve the above purpose, the present application provides the following technical scheme: A vehicle wheel hub bearing assembly, comprising a bearing seat, a bearing outer ring, a bearing inner ring, balls and a retainer, the bearing outer ring is fixedly connected with the bearing seat, the inner wall of the bearing outer ring is provided with two inner slides, the outer side of the bearing inner ring is provided with two outer slides, a plurality of balls are distributed along the outer side of the bearing inner ring, and the balls are located between the outer slides and the inner slides, the retainer is arranged outside the balls, a sealing ring is arranged between the bearing outer ring and the bearing inner ring, and the vehicle wheel hub bearing assembly further comprises: A plurality of annularly distributed oil storage grooves are opened at both ends of the bearing inner ring and correspond to the outer slides, an oil outlet is opened in the outer slide, and the oil outlet is connected with the oil storage groove through an oil outlet pipe; A feeding assembly is arranged in the oil storage groove. During the rotation of the bearing inner ring with the shaft, the lubricating oil in the oil storage groove is subjected to extrusion force through the feeding assembly due to the centrifugal force, so as to transport the lubricating oil in the oil storage groove to the oil outlet through the oil outlet pipe for lubricating the bearing. A limiting assembly is arranged in the bearing inner ring and used for limiting the feeding assembly; A plugging assembly is arranged in the bearing inner ring and connected with the oil outlet pipe. When the bearing is insufficiently lubricated and generates friction, the bearing inner ring is heated by friction. At this time, the plugging assembly is opened due to temperature change, so as to realize automatic replenishment of lubricating oil.

[0007] As a preferred technical scheme of the present application, the feeding assembly comprises an extrusion plate, the extrusion plate is attached to the inner wall of the oil storage groove, and a micro counterweight is arranged at one end of the extrusion plate close to the axis of the bearing inner ring, and first limiting blocks are arranged on both sides of the inner wall of the oil storage groove.

[0008] As a preferred technical scheme of the present application, the oil storage groove is provided with a sensor at one end close to the axis of the bearing inner ring.

[0009] As a preferred technical scheme of the present application, the limiting assembly comprises a limiting groove arranged on the outer side of the bearing inner ring and corresponding to the oil storage groove, a limiting plate is arranged in the limiting groove, the limiting plate is connected with the extrusion plate through a connecting rod, the connecting rod is connected with the sliding groove of the bearing inner ring, wave grooves are arranged on both sides of the limiting groove, and limiting members corresponding to the wave grooves are arranged on both sides of the limiting plate.

[0010] As a preferred technical scheme of the present application, the limiting member comprises a sliding cavity arranged on both sides of the limiting plate, a mounting bracket is arranged in the sliding cavity and slides, a rolling ball is arranged on the side of the mounting bracket facing the wave groove, and an elastic member connected with the mounting bracket is arranged in the sliding cavity.

[0011] As a preferred technical scheme of the present application, the plugging assembly comprises a plugging groove arranged in the bearing inner ring and connected with the oil outlet pipe, a plugging plate is arranged in the plugging groove and slides, a communication hole is arranged on the plugging plate and is arranged in a staggered manner with the oil outlet pipe, an inner cavity is arranged on one side of the bearing inner ring where the oil outlet pipe is located, a sliding groove is arranged on the inner wall of the inner cavity, a sliding plate is connected with the sliding groove, two symmetrical memory metals connected with the sliding plate are arranged in the inner cavity, and a second limiting block is arranged in the inner cavity.

[0012] As a preferred technical scheme of the present application, a plurality of oil replenishing pipes connected with the oil storage groove are arranged at both ends of the bearing inner ring, a sealing bolt is arranged at one end of the outer side of the oil replenishing pipe, and a one-way valve is arranged in the oil replenishing pipe.

[0013] The application has the following advantages: during rotation of the bearing inner ring, the decrease of lubricating oil will cause the friction of the bearing inner ring to increase, which will cause the temperature of the bearing inner ring to rise, and under the action of heat, the blocking assembly will automatically open the oil outlet pipe, and under the action of centrifugal force, the feeding assembly can extrude the lubricating oil in the oil tank, and then the lubricating oil in the oil tank can be automatically transported from the oil outlet pipe to the oil outlet, and the extruded lubricating oil can lubricate the bearing, so that the oil supplement operation can be performed in time when the bearing lubrication fails, and the damage of the bearing and the service life of the bearing are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a vehicle wheel hub bearing assembly.

[0015] Figure 2 It is a sectional view schematic diagram of a vehicle wheel hub bearing assembly.

[0016] Figure 3 It is Figure 2 the local enlarged view of A in the middle.

[0017] Figure 4 It is a structural schematic diagram of an extrusion plate and a micro-weight block in a vehicle wheel hub bearing assembly.

[0018] Figure 5 It is Figure 3 the local enlarged view of B.

[0019] Figure 6 It is a structural schematic diagram of a blocking assembly in a vehicle wheel hub bearing assembly.

[0020] Figure 7 It is Figure 3 the local enlarged view of C.

[0021] In the figure: 1, bearing seat; 2, bearing outer ring; 3, bearing inner ring; 4, inner slide; 5, outer slide; 6, ball; 7, retainer; 8, sealing ring; 9, oil tank; 10, first limiting block; 11, extrusion plate; 12, micro-weight block; 13, sensor; 14, oil outlet; 15, oil outlet pipe; 16, blocking groove; 17, blocking plate; 18, communication hole; 19, inner cavity; 20, sliding groove; 21, sliding plate; 22, memory metal; 23, second limiting block; 24, limiting groove; 25, limiting plate; 26, connecting rod; 27, wave groove; 28, sliding cavity; 29, mounting frame; 30, rolling ball; 31, elastic member; 32, oil supplement pipe; 33, one-way valve; 34, sealing bolt; 35, feeding assembly; 36, limiting assembly; 37, blocking assembly. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described in detail in combination with specific embodiments.

[0023] Please refer to Figures 1-7 A vehicle wheel hub bearing assembly, comprising a bearing seat 1, a bearing outer ring 2, a bearing inner ring 3, a plurality of balls 6 and a retainer 7, the bearing outer ring 2 is fixedly connected with the bearing seat 1, the inner wall of the bearing outer ring 2 is provided with two inner slides 4, the outer side of the bearing inner ring 3 is provided with two outer slides 5, a plurality of balls 6 are distributed along the outer side of the bearing inner ring 3, and the balls 6 are located between the outer slides 5 and the inner slides 4, the retainer 7 is arranged outside the balls 6, a sealing ring 8 is arranged between the bearing outer ring 2 and the bearing inner ring 3, and the sealing ring 8 comprises: A plurality of annularly distributed oil storage grooves 9 are opened at both ends of the bearing inner ring 3 and correspond to the outer slides 5, an oil outlet 14 is opened in the outer slide 5, the oil outlet 14 is connected with the oil storage groove 9 through an oil outlet pipe 15, wherein the oil outlet pipe 15 is provided with a plurality of oil outlet pipes, which are located in the middle of the outer slide 5 and are spaced apart and connected with the oil storage groove 9, and the oil outlet 14 is also provided with a plurality of oil outlets, which are respectively connected with the plurality of oil outlet pipes, so that the lubricating oil extruded by the oil outlet 14 can cover the outer slide 5 of the bearing inner ring 3 more quickly; A feeding assembly 35 is arranged in the oil storage groove 9, and in the process of rotating the bearing inner ring 3 along with the shaft, the lubricating oil in the oil storage groove 9 is extruded by the feeding assembly 35 through the centrifugal force, so as to be delivered to the oil outlet 14 through the oil outlet pipe 15, so as to lubricate the bearing; A limiting assembly 36 is arranged on the bearing inner ring 3 and used for limiting the feeding assembly 35; A plugging assembly 37 is arranged on the bearing inner ring 3 and connected with the oil outlet pipe 15, when the bearing is insufficiently lubricated and friction occurs, the bearing inner ring 3 will be heated due to friction, at this time, the plugging assembly 37 will open the oil outlet pipe 15 due to temperature change, so as to realize automatic supply of the lubricating oil.

[0024] In one case of the embodiment, please refer to Figures 2-4 The feeding assembly 35 comprises an extrusion plate 11, the extrusion plate 11 is attached to the inner wall of the oil storage groove 9, one end of the extrusion plate 11 close to the axis of the bearing inner ring 3 is provided with a micro counterweight 12, and the inner wall of the oil storage groove 9 is provided with a first limiting block 10 on both sides.

[0025] In the processing of the bearing, the oil storage tank 9 is filled with lubricating oil, so that the lubricating oil fills the storage space of the oil storage tank 9, thereby providing raw materials for subsequent bearing oil supplement, and at this time the extrusion plate 11 is located at the first limiting block 10, and the micro counterweight 12 installed on the extrusion plate 11 can improve the centrifugal force acting on the extrusion plate 11 during the rotation of the bearing inner ring 3, thereby generating stronger centrifugal thrust, thereby facilitating the extrusion of the lubricating oil in the oil storage tank 9 from the oil outlet 14.

[0026] In the process of oil supplement, the extrusion plate 11 generates extrusion thrust on the lubricating oil in the oil storage tank 9 due to the centrifugal force generated by the rotation of the bearing inner ring 3, and the lubricating oil cannot be pressed out due to the blocking of the oil outlet pipe 15 by the blocking assembly 37. When the bearing lubricating oil is lacking due to friction, the bearing inner ring 3 will be frictionally heated, causing the blocking assembly 37 to open the oil outlet pipe 15. Under the driving of the centrifugal force, the extrusion plate 11 will extrude the lubricating oil in the oil storage tank 9 outward, which is transported to the oil outlet 14 through the oil outlet pipe 15. The lubricating oil extruded through the oil outlet 14 can directly lubricate the outer slide 5 of the bearing inner ring 3, and the rolling ball 6 will also be lubricated by the lubricating oil extruded through the oil outlet 14. Under the action of the centrifugal force, the lubricating oil extruded through the oil outlet 14 will also be thrown onto the inner slide 4 of the bearing outer ring 2, and will completely cover the inner slide 4 and the outer slide 5 with the rolling of the ball 6, thereby completing the supplement of the lubricating oil.

[0027] In one case of the present embodiment, please refer to Figures 2-3 , the oil storage tank 9 is installed with a sensor 13 at one end close to the axis of the bearing inner ring 3.

[0028] The sensor 13 is used to detect the amount of lubricating oil in the oil storage tank 9 and transmit data to the vehicle computer, so that maintenance personnel can supplement the lubricating oil in the oil storage tank 9 according to the transmission data of the sensor 13.

[0029] In the present embodiment, the sensor 13 is a distance sensor, which is used to detect the position of the extrusion plate 11 in the oil storage tank 9, so as to judge the amount of lubricating oil in the oil storage tank 9.

[0030] In one case of the present embodiment, please refer to Figure 3 , Figure 6 and Figure 7 , the limiting assembly 36 includes a limiting groove 24 opened on the outer side of the bearing inner ring 3 and corresponding to the oil storage tank 9, a limiting plate 25 is arranged in the limiting groove 24, the limiting plate 25 is connected with the extrusion plate 11 through a connecting rod 26, the connecting rod 26 is slidingly connected with the bearing inner ring 3, wave grooves 27 are opened on both sides of the limiting groove 24, and limiting pieces are arranged on both sides of the limiting plate 25 and matched with the wave grooves 27.

[0031] Further, the limiting piece comprises slide cavities 28 formed on both sides of the limiting plate 25, a mounting rack 29 is slidably arranged in the slide cavity 28, the mounting rack 29 is provided with a rolling ball 30 on the side facing the wave groove 27, and an elastic piece 31 connected with the mounting rack 29 is arranged in the slide cavity 28.

[0032] In the initial state, the mounting rack 29 is subjected to the elastic force away from the side of the middle part of the limiting plate 25, so that the rolling ball 30 on the mounting rack 29 can be in contact with the wave groove 27 at all times, the limiting plate 25 is limited by allowing the rolling ball 30 to be clamped in the groove part of the wave groove 27, the extrusion plate 11 is limited by the connecting rod 26, and the rolling ball 30 will not move along the wave groove 27 in the case that the limiting plate 25 does not have enough pushing force, so that the extrusion plate 11 can be positioned when the bearing is not in the working state, and the extrusion plate 11 is prevented from being randomly shaken in the oil storage groove 9, and thus the extrusion plate 11 will not move without enough centrifugal force.

[0033] When the extrusion plate 11 generates the extrusion driving force on the lubricating oil in the oil storage groove 9 due to the centrifugal force, the existence of the centrifugal force will push the limiting plate 25 to slide in the limiting groove 24 through the connecting rod 26, and due to the generation of the centrifugal force, the limiting of the rolling ball 30 by the groove of the wave groove 27 can be overcome, so that the limiting plate 25 can slide along the limiting groove 24, and the rolling ball 30 will roll along the wave groove 27.

[0034] In the embodiment, the specific structure of the elastic piece 31 is not limited, and preferably, the elastic piece 31 is a spring.

[0035] In one case of the embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , the plugging assembly 37 comprises a plugging groove 16 formed in the bearing inner ring 3 and connected with the oil outlet pipe 15, a plugging plate 17 is slidably arranged in the plugging groove 16, a communication hole 18 is formed in the plugging plate 17 and arranged in a staggered manner with the oil outlet pipe 15, an inner cavity 19 is formed in the bearing inner ring 3 on one side of the oil outlet pipe 15, a slide groove 20 is formed in the inner wall of the inner cavity 19, a sliding plate 21 is slidably connected with the slide groove 20, two symmetrical memory metals 22 are arranged in the inner cavity 19 and connected with the sliding plate 21, and a second limiting block 23 is arranged in the inner cavity 19.

[0036] Wherein the memory metal 22 is initially curved, and when the memory metal 22 reaches a certain temperature, the memory metal 22 will unfold and the bending degree will decrease, the bending deformation of the memory metal 22 drives the sealing plate 17 to move in the sealing groove 16, so that the communication hole 18 on the sealing plate 17 is misaligned or communicated with the oil outlet pipe 15, initially, the sliding plate 21 is located at the second limiting block 23, at this time, the sealing plate 17 seals the oil outlet pipe 15, and when the memory metal 22 unfolds, the sealing plate 17 moves to the end of the sealing groove 16, and the communication hole 18 is communicated with the oil outlet pipe 15.

[0037] Specifically, when the bearing inner ring 3 rotates and the friction is intensified due to insufficient lubrication, the bearing inner ring 3 will heat up due to friction, and when the heat reaches the deformation requirement of the memory metal 22, the memory metal 22 starts to deform and drives the sliding plate 21 to slide along the sliding groove 20, thereby driving the sealing plate 17 to move along the sealing groove 16 until it moves to the end of the sealing groove 16, at this time, the communication hole 18 is communicated with the oil outlet pipe 15, and under the extrusion of the feeding assembly 35 on the lubricating oil in the oil storage groove 9, the lubricating oil will be extruded from the oil outlet 14 through the oil outlet pipe 15, thereby realizing the replenishment of the lubricating oil.

[0038] In one case of the embodiment, please refer to Figures 2-3 The bearing inner ring 3 is provided with a plurality of oil supplement pipes 32 communicated with the oil storage groove 9 at both ends, the outer side of the oil supplement pipe 32 is provided with a sealing bolt 34, and the oil supplement pipe 32 is provided with a one-way valve 33 inside, so as to prevent the lubricating oil in the oil storage groove 9 from flowing out of the oil supplement pipe 32.

[0039] When the lubricating oil is replenished, the sealing bolt 34 is opened, and the external lubricating oil supplement pipe is inserted into the oil supplement pipe 32, the lubricating oil is sent into the oil supplement pipe 32 through the external lubricating oil supplement pipe, and then enters the oil storage groove 9, until the oil storage groove 9 is filled with lubricating oil, then the external lubricating oil supplement pipe is pulled out, and the sealing bolt 34 is screwed into the oil supplement pipe 32, so as to seal the end of the oil supplement pipe 32.

[0040] When the lubricating oil of the bearing is reduced due to long-term wear during the working process of the bearing, the friction of the bearing inner ring 3 will be intensified during rotation, and the temperature of the bearing inner ring 3 will rise due to friction, so that the memory metal 22 of the sealing assembly 37 deforms under the action of heat, thereby driving the sealing assembly 37 to open the oil outlet pipe 15, and under the action of centrifugal force, the feeding assembly 35 will be driven away from the axis of the bearing, so that the feeding assembly 35 can be driven by the centrifugal force, so that the feeding assembly 35 can extrude the lubricating oil in the oil storage groove 9 and deliver the lubricating oil to the oil outlet 14 through the oil outlet pipe 15.

[0041] The lubricating oil extruded from the oil outlet 14 will enter the outer slide 5 of the bearing inner ring 3, so that the outer slide 5 can be lubricated, and the rolling ball 6 will also be in contact with the lubricating oil extruded from the oil outlet 14, thereby completing the lubrication, and under the action of centrifugal force, the lubricating oil extruded from the oil outlet 14 will also be thrown onto the inner slide 4 of the bearing outer ring 2, and with the rolling of the ball 6, the lubricating oil will completely cover the inner slide 4 and the outer slide 5, thereby completing the lubricating oil supply to the bearing. With the supply of lubricating oil, the bearing inner ring 3 no longer generates heat due to friction, so that the bearing inner ring 3 is quickly cooled, and the memory metal 22 will reset due to the decrease in temperature, and the sealing assembly 37 will reset and reseal the oil outlet pipe 15, thereby completing the automatic supply of lubricating oil.

[0042] The power supply and control of each electrical device in the present application are prior art, and will not be described in detail here. The control of each component can be achieved by using the PLC controller disclosed in the prior art, and the model and circuit connection of each component are not specifically limited. The electrical devices involved are prior art, and those skilled in the art can implement them without further description. The content protected by the present application does not involve improvement of software and methods.

[0043] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all variations falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0044] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A vehicle wheel hub bearing assembly, comprising a bearing seat, a bearing outer ring, a bearing inner ring, a plurality of balls and a cage, the bearing outer ring is fixedly connected with the bearing seat, an inner wall of the bearing outer ring is provided with two inner slides, an outer side of the bearing inner ring is provided with two outer slides, the plurality of balls are distributed along the outer side of the bearing inner ring, and the balls are located between the outer slides and the inner slides, the cage is arranged outside the balls, and a sealing ring is arranged between the bearing outer ring and the bearing inner ring, characterized in that, Also include: A plurality of annularly distributed oil storage grooves are arranged at both ends of the bearing inner ring and correspond to the outer slide; An oil outlet is arranged in the outer slide, and the oil outlet is connected with the oil storage groove through an oil outlet pipe; A feeding assembly is arranged in the oil storage groove, and the feeding assembly provides extrusion force to the lubricating oil in the oil storage groove through the centrifugal force during the rotation of the bearing inner ring following the shaft body, so as to transport the lubricating oil in the oil storage groove to the oil outlet through the oil outlet pipe, and lubricate the bearing; A limiting assembly is arranged in the bearing inner ring, and is used for limiting the feeding assembly; 2. The vehicle hub bearing assembly of claim 1, wherein, A plugging assembly is arranged in the bearing inner ring and connected with the oil outlet pipe, and when the bearing is insufficiently lubricated and friction occurs, the bearing inner ring will be heated due to friction, and at this time the plugging assembly will open the oil outlet pipe due to temperature change, so as to realize automatic replenishment of lubricating oil.

3. The vehicle hub bearing assembly of claim 2, wherein, The feeding assembly comprises an extrusion plate which is in close contact with the inner wall of the oil storage groove, and a micro counterweight is arranged at one end of the extrusion plate close to the axis of the bearing inner ring.

4. The vehicle hub bearing assembly of claim 2, wherein, A sensor is arranged at one end of the oil storage groove close to the axis of the bearing inner ring.

5. The vehicle hub bearing assembly of claim 4, wherein, The limiting assembly comprises a limiting groove arranged on the outer side of the bearing inner ring and corresponding to the oil storage groove, a limiting plate is arranged in the limiting groove, the limiting plate is connected with the extrusion plate through a connecting rod, the connecting rod is connected with the slide of the bearing inner ring, and wave grooves are arranged on both sides of the limiting groove, and limiting members are arranged on both sides of the limiting plate and matched with the wave grooves.

6. The vehicle hub bearing assembly of claim 5, wherein, The limiting member comprises a sliding cavity arranged on both sides of the limiting plate, a mounting bracket is slidably arranged in the sliding cavity, a rolling ball is arranged on one side of the mounting bracket facing the wave groove, and an elastic member is arranged in the sliding cavity and connected with the mounting bracket.

7. The vehicle hub bearing assembly of claim 6, wherein, The plugging assembly comprises a plugging groove arranged in the bearing inner ring and connected with the oil outlet pipe, a plugging plate is slidably arranged in the plugging groove, a communication hole is arranged on the plugging plate and arranged in a staggered manner with the oil outlet pipe, an inner cavity is arranged on one side of the bearing inner ring where the oil outlet pipe is located, a sliding groove is arranged on the inner wall of the inner cavity, a sliding plate is slidably connected with the sliding groove, two symmetrical memory metals are arranged in the inner cavity and connected with the sliding plate, and a second limiting block is arranged in the inner cavity. A plurality of oil supplement pipes are arranged at both ends of the bearing inner ring and communicated with the oil storage groove, a sealing bolt is arranged at one end of the outer side of the oil supplement pipe, and a one-way valve is arranged in the oil supplement pipe.

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