Lubricating structure and lubricating method of rolling bearing for water pump

Abstract

The application is suitable for the technical field of water pumps, and provides a lubricating structure of a rolling bearing for a water pump, which comprises a pump body, a shaft is installed in the pump body, and the area of the shaft inside the pump body is installed on the inner wall of the pump body through a bearing; two first liquid storage cavities are formed in cooperation with the inner wall of the pump body, a sealing cover, the first liquid storage cavities and the inner wall of the pump body cooperate to form a second liquid storage cavity, and the first liquid storage cavities and the second liquid storage cavity are communicated through liquid guide channels; a driving assembly is further arranged in the first liquid storage cavity, the driving assembly comprises a driving plate and a piston plate, the driving plate is obliquely installed on the shaft, the piston plate is connected with the inside of the pump body through a return spring, a guide rod is arranged on the piston plate, and one end of the guide rod away from the piston plate is in abutment with the driving plate. The device can realize automatic lubrication, effectively reduce the use amount of lubricant, fully mix the lubricant, improve the utilization rate of the lubricant, and has good use effect.

Description

Technical Field

[0001] This invention belongs to the field of water pump technology, and particularly relates to a lubrication structure and lubrication method for a rolling bearing used in water pumps. Background Technology

[0002] A water pump is a device for lifting and transporting liquids. It transfers the mechanical energy of a prime mover or other external energy to the liquid, giving the liquid kinetic or potential energy. It is mainly used to transport liquids including water, oil, acids and alkalis, emulsions, suspensions, and liquid metals, and can also transport gas mixtures and liquids containing suspended solids. Based on different working principles, they can be divided into positive displacement pumps and centrifugal pumps. The water pump bearing housing is a component used to support the shaft. The bearing is installed in a bearing housing. As a rotating component, the bearing housing is an important supporting and positioning component of the water pump.

[0003] Currently, the bearings of existing water pumps are lubricated with grease. Since there is no grease lubrication hole, when it is necessary to add grease to the bearings, the bearing housing cover must be opened and the grease must be manually applied to the rolling elements of the bearing using a flathead screwdriver. This is time-consuming and laborious, and it also wastes grease, increasing maintenance costs. Furthermore, manual grease application is prone to incomplete application, resulting in poor lubrication of the water pump bearings. This can affect the service life of the water pump bearings during prolonged operation. Summary of the Invention

[0004] The purpose of this invention is to provide a lubrication structure and lubrication method for a rolling bearing for a water pump, in order to solve the problems mentioned in the background art.

[0005] The present invention is implemented as follows: a lubrication structure for a rolling bearing for a water pump includes a pump body, with sealing covers detachably installed at both ends of the pump body, a shaft installed in the pump body, and a sealing cover passing through each end of the shaft, and the area of ​​the shaft located inside the pump body is mounted on the inner wall of the pump body by two symmetrically arranged bearings.

[0006] The two bearings cooperate with the inner wall of the pump body to form a first liquid storage chamber, and the sealing cover, the first liquid storage chamber and the inner wall of the pump body cooperate with each other to form a second liquid storage chamber. The first liquid storage chamber and the second liquid storage chamber are interconnected through a liquid guiding channel, and multiple liquid guiding channels are arranged in a ring in the pump body. A one-way valve assembly is also provided at the connection between the liquid guiding channel and the first liquid storage chamber. The one-way valve assembly is used to adjust the communication state between the first liquid storage chamber and the liquid guiding channel.

[0007] The first liquid storage chamber is also provided with a drive assembly, which includes a drive plate mounted on a shaft and two piston plates symmetrically mounted on both sides of the drive plate. The drive plate is mounted obliquely on the shaft, and the projection surface of the drive plate along the axial direction of the shaft is circular. The side of the piston plate away from the drive plate is connected to the inside of the pump body through a return spring. Each piston plate is provided with a guide rod on the side close to the drive plate. The end of the guide rod away from the piston plate abuts against the drive plate, and the two guide rods are symmetrical about the center of the drive plate.

[0008] In a further technical solution, the liquid guiding channel has a frustum-shaped cross-section, and the diameter of the liquid guiding channel gradually decreases along the direction from the liquid replenishment port to the second liquid storage chamber.

[0009] In a further technical solution, a perforated mesh plate is provided at the connection between the liquid guiding channel and the second liquid storage chamber.

[0010] In a further technical solution, the one-way valve assembly includes a sealing ring installed at the connection between the first liquid storage chamber and the liquid guiding channel. The sealing ring has a plurality of stepped through holes arranged in a ring. The number of stepped through holes is the same as the number of liquid guiding channels, and the diameter of the stepped through holes on the side closer to the liquid guiding channel is larger. The stepped part of the stepped through hole is rotatably mounted on the sealing plate.

[0011] In a further technical solution, two replenishment ports are provided on the side wall of the pump body. The replenishment ports are used to deliver lubricant to the first liquid storage chamber. The replenishment ports are connected to an external supply device, and the connection points of the two replenishment ports and the first liquid storage chamber are respectively located in the area between the two piston plates and the corresponding sealing rings.

[0012] In a further technical solution, the end of the guide rod abuts against the drive plate via a ball bearing, and the ball bearing is rotatably mounted on the guide rod.

[0013] In a further technical solution, the diameter of the piston plate is smaller than the inner diameter of the first liquid storage chamber, and a sealing gasket is fitted on the side wall of the piston plate, and the piston plate contacts the inner wall of the pump body through the sealing gasket.

[0014] In a further technical solution, the sealing gasket is made of wear-resistant rubber.

[0015] In a further technical solution, a touch switch for controlling the start and stop of the external supply equipment is also provided on the inner wall of the pump body. The touch switch is located on the side away from the bearing at the connection between the liquid inlet and the first liquid storage chamber.

[0016] A further technical solution is that the surface of the shaft is fitted with a packing ring and a mechanical seal, and both ends of the shaft near the pump body are provided with packing rings and mechanical seals. By setting mechanical seals and packing rings, the sealing performance of the pump body can be effectively improved.

[0017] Another objective of this invention is to provide a lubrication method for a rolling bearing used in a water pump, based on the aforementioned lubrication structure for the rolling bearing used in a water pump, comprising the following steps:

[0018] Step 1: Pre-store lubricant in the first reservoir and complete the initial lubrication of the bearing, then start the shaft;

[0019] Step 2: The shaft drives the drive plate to rotate synchronously. When the drive plate pushes the piston plate to move closer to the bearing through the guide rod, it can push the lubricant in the first reservoir to the second reservoir. When the piston plate moves away from the bearing, it can draw the lubricant in the second reservoir back into the first reservoir, and make the lubricant pass through the bearing again. This lubrication process can ensure that the lubricant passes through the gap of the bearing evenly.

[0020] Step 3: When lubricant needs to be replenished, the external supply device can replenish lubricant into the first reservoir through the replenishment port. At the same time, the lubricant used in the first reservoir can also be discharged through the replenishment port to replace the lubricant.

[0021] In a further technical solution, during step 2, as the piston plate pushes the lubricant from the first reservoir to the second reservoir, the lubricant is delivered to the second reservoir through two pathways: firstly, the lubricant directly enters the second reservoir through the gap on the bearing, thereby directly lubricating the bearing; secondly, the lubricant is evenly distributed in the second reservoir through the liquid guiding channel, thereby ensuring a uniform distribution of lubricant in the second reservoir.

[0022] This invention provides a lubrication structure for a rolling bearing in a water pump. During use, the shaft rotates, causing a drive plate to rotate synchronously. With the cooperation of the drive plate and the guide rod, the rotational motion of the drive plate is converted into linear sliding of the piston plate along the shaft axis. Simultaneously, with the elastic restoring force of the return spring, the piston plate can perform linear reciprocating motion in the first reservoir. When the piston plate moves towards the bearing, it pushes the lubricant in the first reservoir into the second reservoir. During this process, the lubricant is delivered to the second reservoir through two pathways: firstly, the lubricant directly enters the second reservoir through the gap in the bearing, thus directly lubricating the bearing; secondly, the lubricant is delivered to the second reservoir through a liquid guiding channel, which evenly distributes the lubricant within the second reservoir. When the piston plate moves away from the bearing, it draws the lubricant from the second reservoir back into the first reservoir, allowing the lubricant to pass through the bearing again. This lubrication process ensures that the lubricant flows evenly through the bearing clearance. This device enables automatic lubrication, effectively reducing lubricant usage and ensuring thorough mixing, thus improving lubricant utilization and resulting in excellent performance. Attached Figure Description

[0023] Figure 1 A schematic diagram of a lubrication structure for a rolling bearing for a water pump, provided in an embodiment of the present invention;

[0024] Figure 2 A lubrication structure for a rolling bearing for a water pump provided in an embodiment of the present invention. Figure 1 Enlarged view of point A;

[0025] Figure 3 A lubrication structure for a rolling bearing for a water pump provided in an embodiment of the present invention. Figure 1 Enlarged view of point B;

[0026] Figure 4 This is a schematic diagram of the one-way valve assembly 4 in the lubrication structure of a rolling bearing for a water pump provided in an embodiment of the present invention.

[0027] In the attached diagram: Shaft 1; Bearing 11; Pump body 2; Sealing cover 21; First liquid storage chamber 22; Second liquid storage chamber 23; Liquid guiding channel 24; Liquid replenishment port 25; Drive assembly 3; Drive plate 31; Guide rod 32; Piston plate 33; Return spring 34; Ball bearing 35; One-way valve assembly 4; Sealing ring 41; Stepped through hole 42; Sealing plate 43. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] like Figure 1-3 As shown, a lubrication structure for a rolling bearing for a water pump is provided in an embodiment of the present invention. It includes a pump body 2, with sealing covers 21 detachably installed at both ends of the pump body 2. A shaft 1 is installed in the pump body 2, and a sealing cover 21 passes through both ends of the shaft 1. The area of ​​the shaft 1 located inside the pump body 2 is mounted on the inner wall of the pump body 2 by two symmetrically arranged bearings 11.

[0031] The two bearings 11 cooperate with each other to form a first liquid storage chamber 22. The sealing cover 21, the first liquid storage chamber 22 and the inner wall of the pump body 2 cooperate with each other to form a second liquid storage chamber 23. The first liquid storage chamber 22 and the second liquid storage chamber 23 are interconnected through a liquid guiding channel 24. A plurality of liquid guiding channels 24 are arranged in a ring in the pump body 2. A one-way valve assembly 4 is also provided at the connection between the liquid guiding channel 24 and the first liquid storage chamber 22. The one-way valve assembly 4 is used to adjust the communication state between the first liquid storage chamber 22 and the liquid guiding channel 24.

[0032] The first liquid storage chamber 22 is also provided with a drive assembly 3. The drive assembly 3 includes a drive plate 31 mounted on the shaft 1 and two piston plates 33 symmetrically mounted on both sides of the drive plate 31. The drive plate 31 is mounted obliquely on the shaft 1, and the projection surface of the drive plate 31 along the axial direction of the shaft 1 is circular. The side of the piston plate 33 away from the drive plate 31 is connected to the inside of the pump body 2 through a return spring 34. A guide rod 32 is provided on the side of the piston plate 33 close to the drive plate 31. The end of the guide rod 32 away from the piston plate 33 abuts against the drive plate 31, and the two guide rods 32 are symmetrical about the center of the drive plate 31.

[0033] In this embodiment of the invention, during use, it is not necessary to ensure that the pump body 2 is completely filled with lubricant, which can effectively reduce the amount of lubricant used. Specifically, during the rotation of shaft 1, the drive plate 31 rotates synchronously. Under the cooperation of the drive plate 31 and the guide rod 32, the rotational motion of the drive plate 31 can be converted into the linear sliding of the piston plate 33 along the axial direction of shaft 1. Simultaneously, under the elastic restoring force of the return spring 34, the piston plate 33 can perform linear reciprocating motion in the first liquid storage chamber 22. When the piston plate 33 moves towards the side closer to the bearing 11, it can push the lubricant in the first liquid storage chamber 22 into the second liquid storage chamber 23. During this process, the lubricant is delivered to the second reservoir 23 through two pathways: firstly, the lubricant directly enters the second reservoir 23 through the gap in the bearing 11, thus directly lubricating the bearing 11; secondly, the lubricant is delivered to the second reservoir 23 through the liquid guiding channel 24, which ensures that the lubricant is evenly distributed in the second reservoir 23. When the piston plate 33 moves away from the bearing 11, it can draw the lubricant in the second reservoir 23 back into the first reservoir 22, allowing the lubricant to pass through the bearing 11 again. This lubrication process ensures that the lubricant passes evenly through the gap in the bearing 11.

[0034] like Figure 2 As shown, in a preferred embodiment of the present invention, the liquid guiding channel 24 has a frustum-shaped cross-section, and its diameter gradually decreases along the direction from the liquid replenishment port 25 to the second liquid storage chamber 23. This allows the liquid guiding channel 24 to deliver a larger amount of lubricant during the process of lubricant being transported from the liquid replenishment port 25 to the second liquid storage chamber 23. When the lubricant in the second liquid storage chamber 23 needs to be discharged into the liquid replenishment port 25, the smaller port of the liquid guiding channel 24 reduces the amount of lubricant transported through it, thereby allowing a large amount of lubricant to pass through the bearing 11, achieving efficient lubrication.

[0035] In this embodiment of the invention, a perforated mesh plate is also provided at the connection between the liquid guiding channel 24 and the second liquid storage chamber 23, which can further reduce the backflow of lubricant in the second liquid storage chamber 23 to the first liquid storage chamber 22 through the liquid guiding channel 24. At the same time, it can also disperse the lubricant delivered to the second liquid storage chamber 23 through the liquid guiding channel 24, so that the lubricant can be delivered to each position of the bearing 11 more evenly.

[0036] like Figure 2 and 4As shown, in a preferred embodiment of the present invention, the one-way valve assembly 4 includes a sealing ring 41 installed at the connection between the first liquid storage chamber 22 and the liquid guiding channel 24. The sealing ring 41 has a plurality of stepped through holes 42 arranged in a ring. The number of stepped through holes 42 is the same as the number of liquid guiding channels 24, and the diameter of the stepped through holes 42 on the side closer to the liquid guiding channel 24 is larger. The stepped part of the stepped through hole 42 is rotatably mounted on the sealing plate 43.

[0037] In this embodiment of the invention, during use, when the lubricant in the first liquid storage chamber 22 is transported to the second liquid storage chamber 23, the damping effect of the lubricant in the first liquid storage chamber 22 can cause the sealing plate 43 to rotate. At this time, the liquid guiding channel 24 is connected to the first liquid storage chamber 22 through the stepped through hole 42, and the lubricant in the first liquid storage chamber 22 can be transported to the second liquid storage chamber 23 through the channel formed by the stepped through hole 42 and the liquid guiding channel 24.

[0038] During the process of transporting the lubricant in the second reservoir 23 back to the first reservoir 22, the damping effect of the lubricant flowing through the liquid guiding channel 24 will cause the sealing plate 43 to be stably engaged at the step of the stepped through hole 42. At this time, the liquid guiding channel 24 is disconnected from the first reservoir 22, so that the lubricant in the second reservoir 23 can only flow back to the first reservoir 22 through the gap on the bearing 11, thereby achieving sufficient lubrication of the bearing 11 and simultaneously improving the utilization rate of the lubricant.

[0039] like Figure 1 and 2 As shown, in a preferred embodiment of the present invention, two replenishment ports 25 are also provided on the side wall of the pump body 2. The replenishment ports 25 are used to deliver lubricant to the first liquid storage chamber 22. The replenishment ports 25 are connected to an external supply device, and the connection points of the two replenishment ports 25 and the first liquid storage chamber 22 are respectively located in the area between the two piston plates 33 and the corresponding sealing rings 41.

[0040] In this embodiment of the invention, the external supply device can replenish lubricant into the first liquid storage chamber 22 through the replenishment port 25, and at the same time, it can also discharge the lubricant used in the first liquid storage chamber 22 through the replenishment port 25 to realize the replacement of lubricant.

[0041] like Figure 3 As shown, in a preferred embodiment of the present invention, the end of the guide rod 32 abuts against the drive plate 31 via a ball bearing 35, and the ball bearing 35 is rotatably mounted on the guide rod 32. The ball bearing 35 converts the sliding friction between the guide rod 32 and the drive plate 31 into rolling friction, thereby effectively reducing wear between components and also reducing damping caused by the rotational movement of the drive plate 31.

[0042] In a preferred embodiment of the present invention, the diameter of the piston plate 33 is smaller than the inner diameter of the first liquid storage chamber 22, and a sealing gasket is provided on the side wall of the piston plate 33, and the piston plate 33 contacts the inner wall of the pump body 2 through the sealing gasket.

[0043] In this embodiment of the invention, the sealing gasket is made of wear-resistant rubber. The piston plate 33 is designed with a diameter smaller than the first liquid storage chamber 22, which facilitates the installation of the piston plate 33, while the sealing gasket effectively ensures a tight seal.

[0044] As a preferred embodiment of the present invention, the inner wall of the pump body 2 is also provided with a touch switch for controlling the start and stop of the external supply equipment. The touch switch is located on the side away from the bearing 11 at the connection between the liquid inlet 25 and the first liquid storage chamber 22.

[0045] In this embodiment of the invention, when lubricant is to be added to the first reservoir 22, when the piston plate 33 moves away from the bearing 11 and first touches the contact switch, the external supply device supplies lubricant to the first reservoir 22 through the replenishment port 25, so that the lubricant is positioned between the piston plate 33 and the bearing 11. When the piston plate 33 touches the contact switch again, the external supply device stops supplying lubricant to the first reservoir 22, preventing lubricant from being introduced between the two piston plates 33.

[0046] In a preferred embodiment of the present invention, the pump body 2 includes a lower pump body, an upper pump body is bolted to the top of the lower pump body, and an end cap is bolted to one side of the lower pump body and the upper pump body, with a sealing ring fitted inside the end cap.

[0047] In this embodiment of the invention, a packing ring and a mechanical seal are fitted onto the surface of the shaft, and a packing ring and a mechanical seal are provided on both ends of the shaft near the pump body. By providing a mechanical seal and a packing ring, the sealing performance of the pump body can be effectively improved.

[0048] The bearing 11 can be a solid oil bearing, with one solid oil bearing installed at each end of the shaft, giving it self-lubricating properties and eliminating the need for adding lubricating oil, thus achieving maintenance-free operation.

[0049] An embodiment of the present invention provides a lubrication method for a rolling bearing for a water pump, based on the above-described lubrication structure for the rolling bearing for a water pump, comprising the following steps:

[0050] Step 1: Pre-store lubricant in the first reservoir 22 and complete the initial lubrication of the bearing 11, then start the shaft 1;

[0051] Step 2: Shaft 1 drives drive plate 31 to rotate synchronously. When drive plate 31 pushes piston plate 33 to move closer to bearing 11 via guide rod 32, it can push lubricant in first reservoir 22 to second reservoir 23. When piston plate 33 moves away from bearing 11, it can draw lubricant in second reservoir 23 back into first reservoir 22, and make lubricant pass through bearing 11 again. This lubrication process can ensure that lubricant passes through the gap of bearing 11 evenly.

[0052] Step 3: When it is necessary to replenish the lubricant, the external supply device can replenish the lubricant into the first liquid storage chamber 22 through the replenishment port 25. At the same time, the lubricant used in the first liquid storage chamber 22 can also be discharged through the replenishment port 25 to replace the lubricant.

[0053] In a preferred embodiment of the present invention, in step 2, during the process of the piston plate 33 pushing the lubricant in the first reservoir 22 to the second reservoir 23, the lubricant is delivered to the second reservoir 23 through two pathways: firstly, the lubricant directly enters the second reservoir 23 through the gap on the bearing 11, thereby directly lubricating the bearing 11; secondly, the lubricant is evenly distributed in the second reservoir 23 through the liquid guiding channel 24, thereby making the lubricant evenly distributed in the second reservoir 23.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lubrication structure for a rolling bearing of a water pump, characterized in that, The pump body includes a pump body with sealing caps detachably installed at both ends. A shaft is installed in the pump body, and each end of the shaft passes through a sealing cap. The area of ​​the shaft located inside the pump body is mounted on the inner wall of the pump body by two symmetrically arranged bearings. The two bearings cooperate with the inner wall of the pump body to form a first liquid storage chamber, and the sealing cover, the first liquid storage chamber and the inner wall of the pump body cooperate with each other to form a second liquid storage chamber. The first liquid storage chamber and the second liquid storage chamber are interconnected through a liquid guiding channel, and multiple liquid guiding channels are arranged in a ring in the pump body. A one-way valve assembly is also provided at the connection between the liquid guiding channel and the first liquid storage chamber. The one-way valve assembly is used to adjust the communication state between the first liquid storage chamber and the liquid guiding channel. The first liquid storage chamber is also provided with a drive assembly, which includes a drive plate mounted on a shaft and two piston plates symmetrically mounted on both sides of the drive plate. The drive plate is obliquely mounted on the shaft, and the projection surface of the drive plate along the axial direction of the shaft is circular. The side of the piston plate away from the drive plate is connected to the inside of the pump body through a return spring. Each piston plate is provided with a guide rod on the side close to the drive plate. The end of the guide rod away from the piston plate abuts against the drive plate, and the two guide rods are symmetrical about the center of the drive plate.

2. The lubrication structure for the rolling bearing of a water pump according to claim 1, characterized in that, The liquid guiding channel has a frustum-shaped cross-section, and its diameter gradually decreases along the direction from the liquid replenishment port to the second liquid storage chamber.

3. The lubrication structure for the rolling bearing of a water pump according to claim 2, characterized in that, A perforated mesh plate is also provided at the connection between the liquid guiding channel and the second liquid storage chamber.

4. The lubrication structure for the rolling bearing of a water pump according to claim 1, characterized in that, The one-way valve assembly includes a sealing ring installed at the connection between the first liquid storage chamber and the liquid guiding channel. The sealing ring has a plurality of stepped through holes arranged in a ring. The number of stepped through holes is the same as the number of liquid guiding channels. The diameter of the stepped through holes is larger on the side closer to the liquid guiding channel. The stepped part of the stepped through hole is rotatably mounted on the sealing plate.

5. The lubrication structure for the rolling bearing of a water pump according to claim 4, characterized in that, The pump body is also provided with two liquid inlets on its side wall. The liquid inlets are used to deliver lubricant to the first liquid storage chamber. The liquid inlets are connected to an external supply device, and the connection points of the two liquid inlets and the first liquid storage chamber are respectively located in the area between the two piston plates and the corresponding sealing rings.

6. The lubrication structure for the rolling bearing of a water pump according to claim 1, characterized in that, The pump body (2) includes a lower pump body, an upper pump body is bolted to the top of the lower pump body, and an end cap is bolted to one side of the lower pump body and the upper pump body. A sealing ring is fitted inside the end cap.

7. The lubrication structure for the rolling bearing of a water pump according to claim 1, characterized in that, The bearing (11) can be a solid oil bearing, and a solid oil bearing is installed at each end of the shaft.

8. The lubrication structure for the rolling bearing of a water pump according to claim 5, characterized in that, The inner wall of the pump body is also equipped with a touch switch for controlling the start and stop of the external supply equipment. The touch switch is located on the side away from the bearing at the connection between the liquid inlet and the first liquid storage chamber.

9. The lubrication structure for a rolling bearing in a water pump according to claim 7, characterized in that, The shaft surface is fitted with a packing ring and a mechanical seal, and the shaft is also provided with a packing ring and a mechanical seal at both ends near the pump body.

10. A lubrication method for a rolling bearing for a water pump, based on the lubrication structure for the rolling bearing for a water pump as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Pre-store lubricant in the first reservoir and complete the initial lubrication of the bearing, then start the shaft; Step 2: The shaft drives the drive plate to rotate synchronously. When the drive plate pushes the piston plate to move closer to the bearing through the guide rod, it pushes the lubricant in the first reservoir into the second reservoir. When the piston plate moves away from the bearing, it draws the lubricant in the second reservoir back into the first reservoir, and the lubricant passes through the bearing again. During this lubrication process, the lubricant passes evenly through the gap of the bearing. Step 3: When lubricant needs to be replenished, the external supply device replenishes lubricant into the first reservoir through the replenishment port. At the same time, the lubricant used in the first reservoir can also be discharged through the replenishment port to replace the lubricant. In step 2, during the process of the piston plate pushing the lubricant from the first reservoir to the second reservoir, the lubricant is delivered to the second reservoir through two pathways: one is that the lubricant directly enters the second reservoir through the gap on the bearing, thereby directly lubricating the bearing; the other is that the lubricant is evenly distributed in the second reservoir through the liquid guiding channel.

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