Heavy car shunting locomotive walking master command device convenient to overhaul and maintain

Abstract

The utility model provides a heavy car shunting locomotive walking master device convenient to overhaul and maintain, which belongs to the technical field of heavy car shunting locomotives, and comprises an upper tilting fillet, a lower tilting fillet, an upper bearing, a lower bearing, a main shaft, a small tilting fillet, a sealing device and a photoelectric encoder, the upper bearing and the lower bearing are both provided with oil injection holes with the outer portions penetrating to the inner portions, the upper bearing is installed in the upper tilting fillet, the lower bearing is installed in the lower tilting fillet, the main shaft penetrates through the upper bearing and the lower bearing, one end of the main shaft is connected with a transmission gear, the small tilting fillet is connected to the side portion of the heavy car shunting locomotive, and the sealing device is connected to the inner portion of the small tilting fillet. The photoelectric encoder is installed in the sealing device and used for being connected with the end, away from the transmission gear, of the main shaft, and the sealing device surrounds and seals the photoelectric encoder. The utility model has the technical effects of being convenient to overhaul and maintain, easy to disassemble and assemble, good in protecting and sealing effect on the photoelectric encoder, not easy to damage and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of heavy car shunting machines, and more specifically, it relates to a walking master control device for a heavy car shunting machine that is convenient for maintenance and repair. Background Art

[0002] At present, a heavy car shunting machine with gear transmission is a supporting device during the unloading operation of a dumper system. It can tow a whole train loaded with bulk goods such as coal, gangue, and ore powder to a certain position. In addition, it can be used alone as a shunting device for occasions where vehicles need to be shunted and accurately positioned according to different requirements.

[0003] The accurate positioning of the heavy car shunting machine during walking is achieved by an optoelectronic encoder. Through the accurate counting of the optoelectronic encoder and in cooperation with the PLC programming system, the start and stop of the heavy car shunting machine at all positions can be accurately controlled. Therefore, the stable operation of the optoelectronic encoder is directly related to the accurate positioning of the heavy car shunting machine.

[0004] The optoelectronic encoder is installed on the walking master control device of the heavy car shunting machine, and the walking master control device is located in the middle position of the heavy car shunting machine body. The walking master control device consists of an optoelectronic encoder, an upper bearing, a lower bearing, a main shaft, a bushing, and a transmission gear. When the walking part of the heavy car shunting machine walks, it drives the transmission gear to rotate, and the optoelectronic encoder installed on the main shaft rotates accordingly to start counting. Since the whole walking master control device is installed inside the heavy car shunting machine body, during daily maintenance, it is impossible to check and add lubricating oil to its upper bearing and lower bearing, and the maintenance is very inconvenient, resulting in frequent damage to the upper bearing and lower bearing, affecting the normal use of the optoelectronic encoder. At the same time, the walking master control device also lacks a device for protecting the optoelectronic encoder, and dust and water are likely to enter the optoelectronic encoder, thereby causing its damage. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a walking master control device for a heavy car shunting machine that is convenient for maintenance and repair, aiming to solve the technical problems in the prior art that the walking master control device of the heavy car shunting machine is installed inside the heavy car shunting machine body, resulting in very inconvenient maintenance and repair, and there is no protection for the optoelectronic encoder and it is easily damaged.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a walking master control device for a heavy car shunting machine that is convenient for maintenance and repair, including:

[0007] An upper bearing seat, connected to the side of the heavy car shunting machine, and is of a split structure;

[0008] A lower bearing seat, connected to the side of the heavy car shunting machine, is of a split structure, is arranged at an interval from the upper bearing seat, and both the upper bearing seat and the lower bearing seat have an oil injection hole that penetrates from the outside to the inside;

[0009] An upper bearing, installed inside the upper shoe seat;

[0010] A lower bearing, installed inside the lower shoe seat;

[0011] A main shaft is arranged through the upper bearing and the lower bearing to form a rotation connection with the upper bearing and the lower bearing respectively, the upper bearing is used to bear the axial load of the main shaft, and the lower bearing is used to bear the radial load of the main shaft, and one end of the main shaft is connected to a transmission gear, and the transmission gear is used to connect the traveling part of the heavy vehicle shunting machine;

[0012] A small tile seat is connected to the side of the heavy vehicle shunting machine and is a split structure, and is arranged close to the end of the main shaft away from the transmission gear;

[0013] A sealing device connected to the inside of the small tile seat;

[0014] A photoelectric encoder is installed inside the sealing device. The photoelectric encoder has a rotating end and a fixed end. The rotating end is used to connect to an end of the main shaft away from the transmission gear, and the fixed end is used to be fixedly connected to the inner wall of the sealing device. The sealing device forms an enclosure for the photoelectric encoder to seal the photoelectric encoder.

[0015] In a possible implementation, the sealing device is a cylinder with an open end and a cylindrical structure, the photoelectric encoder is arranged inside the cylinder, and a first sealing ring is embedded in the inner wall of the open end of the cylinder. One end of the main shaft passes through the first sealing ring and is connected to the photoelectric encoder. The first sealing ring is used to seal the gap between the sealing device and the main shaft.

[0016] In a possible implementation, a mounting hole is provided at one end of the cylinder away from the opening, and a wiring harness connected to the photoelectric encoder passes through the mounting hole.

[0017] In a possible implementation manner, a bracket is connected to the inner wall of the sealing device, and the bracket is used to fix the photoelectric encoder.

[0018] In a possible implementation, a through hole is provided on a side wall of the sealing device, a first top screw is installed in the through hole, and the first top screw is used to fix the bracket.

[0019] In one possible implementation, the spindle end is provided with a groove extending along its axial direction, the rotating end of the photoelectric encoder is inserted into the groove, and the spindle side is provided with a second top screw passing through the groove, and the second top screw is used to fix the rotating end.

[0020] In a possible implementation, second sealing rings are respectively arranged at two ends of the upper bearing seat along the axial direction of the main shaft, and the second sealing rings are used for sealing the gap between the upper bearing seat and the main shaft.

[0021] In a possible implementation, third sealing rings are respectively arranged at two ends of the lower bearing seat along the axial direction of the main shaft, and the third sealing rings are used for sealing the gap between the lower bearing seat and the main shaft.

[0022] In a possible implementation, a base plate is fixedly connected to the side of the heavy-duty car dumper, and the upper bearing seat, the lower bearing seat and the small bearing seat are all fixedly connected to the base plate.

[0023] In a possible implementation, the base plate is connected with a plurality of positioning screws, and the plurality of positioning screws are combined to form a clamping force on the upper bearing seat and the lower bearing seat to fix the upper bearing seat and the lower bearing seat.

[0024] The beneficial effect of the walking master control device of the heavy-duty car dumper provided by the utility model is as follows: compared with the prior art, the walking master control device of the heavy-duty car dumper provided by the utility model includes an upper bearing seat, a lower bearing seat, an upper bearing, a lower bearing, a main shaft, a small bearing seat, a sealing device and an optoelectronic encoder. The upper bearing seat is connected to the side of the heavy-duty car dumper and is of a split structure; the lower bearing seat is connected to the side of the heavy-duty car dumper and is of a split structure, and is arranged at an interval from the upper bearing seat. Both the upper bearing seat and the lower bearing seat have oil injection holes penetrating from the outside to the inside; the upper bearing is installed inside the upper bearing seat; the lower bearing is installed inside the lower bearing seat; the main shaft passes through the upper bearing and the lower bearing to form a rotational connection with the upper bearing and the lower bearing respectively. The upper bearing is used to bear the axial load of the main shaft, and the lower bearing is used to bear the radial load of the main shaft. One end of the main shaft is connected with a transmission gear, and the transmission gear is used to connect the walking part of the heavy-duty car dumper; the small bearing seat is connected to the side of the heavy-duty car dumper and is arranged near one end of the main shaft away from the transmission gear; the sealing device is connected inside the small bearing seat; the optoelectronic encoder is installed inside the sealing device. The optoelectronic encoder has a rotating end and a fixed end. The rotating end is used to connect one end of the main shaft away from the transmission gear, and the fixed end is used to be fixedly connected to the inner wall of the sealing device. The sealing device forms an enclosure for the optoelectronic encoder to seal the optoelectronic encoder, solving the technical problems that the walking master control device of the heavy-duty car dumper is installed inside the body of the heavy-duty car dumper, resulting in very inconvenient maintenance and repair of it, and the optoelectronic encoder is not protected and is easily damaged. It has the technical effects of being convenient for maintenance and repair, easy to disassemble and install, having a good protection and sealing effect on the optoelectronic encoder, not being easily damaged, and having a long service life. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of a walking master device of a heavy car shunting machine provided by an embodiment of the present utility model, which is convenient for overhaul and maintenance;

[0027] Figure 2 It is a structural sectional view of a walking master device of a heavy car shunting machine provided by an embodiment of the present utility model, which is convenient for overhaul and maintenance.

[0028] Explanation of the reference numerals:

[0029] 1. Upper bearing seat; 2. Lower bearing seat; 3. Upper bearing; 4. Lower bearing; 5. Main shaft; 6. Small bearing seat; 7. Sealing device; 8. Photoelectric encoder; 9. Oil injection hole; 10. Transmission gear; 11. First sealing ring; 12. Wiring harness; 13. Bracket; 14. First set screw; 15. Groove; 16. Second set screw; 17. Second sealing ring; 18. Third sealing ring; 19. Substrate; 20. Positioning screw; 21. Bush. Detailed implementation manners

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] Please refer to together Figures 1 to 2, a walking master device for a heavy car shunting machine that is convenient for maintenance and repair will be described. The walking master device for a heavy car shunting machine that is convenient for maintenance and repair includes an upper bearing seat 1, a lower bearing seat 2, an upper bearing 3, a lower bearing 4, a main shaft 5, a small bearing seat 6, a sealing device 7, and an optical encoder 8. The upper bearing seat 1 is connected to the side of the heavy car shunting machine (an existing technical device) and is a split structure; the lower bearing seat 2 is connected to the side of the heavy car shunting machine, is a split structure, and is arranged at an interval from the upper bearing seat 1. Both the upper bearing seat 1 and the lower bearing seat 2 have an oil injection hole 9 that penetrates from the outside to the inside; the upper bearing 3 is installed inside the upper bearing seat 1; the lower bearing 4 is installed inside the lower bearing seat 2; the main shaft 5 passes through the upper bearing 3 and the lower bearing 4 and forms a rotational connection with the upper bearing 3 and the lower bearing 4 respectively. The upper bearing 3 is used to bear the axial load of the main shaft 5, and the lower bearing 4 is used to bear the radial load of the main shaft 5. One end of the main shaft 5 is connected with a transmission gear 10, and the transmission gear 10 is used to connect the walking part of the heavy car shunting machine; the small bearing seat 6 is connected to the side of the heavy car shunting machine, is a split structure, and is arranged near one end of the main shaft 5 away from the transmission gear 10; the sealing device 7 is connected inside the small bearing seat 6; the optical encoder 8 is installed inside the sealing device 7. The optical encoder 8 has a rotating end and a fixed end. The rotating end is used to connect one end of the main shaft 5 away from the transmission gear 10, and the fixed end is fixedly connected to the inner wall of the sealing device 7. The sealing device 7 forms an enclosure around the optical encoder 8 to seal the optical encoder 8.

[0032] Compared with the prior art, the walking master device for a heavy car shunting machine provided by the present invention is installed on the side of the heavy car shunting machine, which is convenient for staff to carry out maintenance and repair, enabling the upper bearing 3 and the lower bearing 4 to be inspected and maintained in a timely manner. At the same time, the sealing device 7 has a good sealing effect on the optical encoder 8, and it is not easy for dust and water to enter. It solves the technical problems that the walking master device of the heavy car shunting machine is installed inside the heavy car shunting machine body, resulting in very inconvenient maintenance and repair, no protection for the optical encoder 8 and easy damage. It has the technical effects of being convenient for maintenance and repair, easy to disassemble and install, having a good protection and sealing effect on the optical encoder 8, not being easily damaged, and having a long service life.

[0033] In this embodiment, the upper bearing seat 1 and the upper bearing 3 are assembled in a matching manner, and the lower bearing seat 2 and the lower bearing 4 are assembled in a matching manner. The center distance between the upper bearing seat 1 and the lower bearing seat 2 is 500 mm. The model of the upper bearing 3 is 7316, and the model of the lower bearing 4 is 7315. Oil is injected into the upper bearing 3 and the lower bearing 4 through the provided oil injection hole 9, which is convenient for daily maintenance and adding lubricating grease. The small bearing seat 6 is a bearing seat with a smaller volume compared to the upper bearing seat 1 and the lower bearing seat 2, and the optical encoder 8 is a prior art product. The above-mentioned split structure is a prior art and is divided into an upper half and a lower half.

[0034] In some embodiments, please refer toFigures 1 to 2 The sealing device 7 is a cylindrical barrel with one end open. The photoelectric encoder 8 is arranged inside the barrel. A first sealing ring 11 is nested on the inner wall of the open end of the barrel. One end of the main shaft 5 passes through the inside of the first sealing ring 11 and is connected to the photoelectric encoder 8. The first sealing ring 11 is used to seal the gap between the sealing device 7 and the main shaft 5. The outer wall of the barrel contacts the inner wall of the small bearing housing 6. After installation, a sealed cavity is formed inside the barrel, and the photoelectric encoder 8 is arranged in this sealed cavity, so dust and water are not likely to enter, achieving a tight sealing effect. The first sealing ring 11 is a skeleton oil seal.

[0035] Preferably, there are two groups of the first sealing rings 11, which are arranged in combination and overlap, and this kind of sealing effect is better.

[0036] For the convenience of installing the wire harness connected to the photoelectric encoder 8, in some embodiments, please refer to Figures 1 to 2 The end of the barrel away from the open end is provided with a mounting hole, and the wire harness 12 connected to the photoelectric encoder 8 passes through the mounting hole. By setting the mounting hole on the barrel and the wire harness 12 passing through this mounting hole, the wire harness 12 does not affect the normal use of the photoelectric encoder 8. The diameter of the mounting hole is 6 mm, and a hole-opening tool such as a drill can be used for hole opening. If there is a gap between the wire harness 12 and the hole wall, sealant or the like can be used for sealing.

[0037] For the convenience of fixing the photoelectric encoder 8, in some embodiments, please refer to Figures 1 to 2 A bracket 13 is connected to the inner wall of the sealing device 7, and the bracket 13 is used for fixedly connecting the photoelectric encoder 8. In this embodiment, there are three brackets 13, which are arranged in a circular array along the circumference of the barrel and are all used for supporting and fixing the photoelectric encoder 8.

[0038] For the convenience of fixing the bracket 13, in some embodiments, please refer to Figures 1 to 2 A through hole is provided on the side wall of the sealing device 7, and a first set screw 14 is installed in the through hole. The first set screw 14 is used for fixedly connecting the bracket 13. The inner end of the first set screw 14 is fixedly connected to the bracket 13, so that the bracket 13 can be fixed. Since there are multiple brackets 13, multiple through holes are correspondingly provided. Through multiple first set screws 14, multiple brackets 13 can be fixed respectively.

[0039] In some embodiments, please refer to Figures 1 to 2, a groove 15 extending along the axial direction is provided at the end of the main shaft 5. The rotating end of the photoelectric encoder 8 is inserted into the interior of the groove 15. A second set screw 16 is provided on the side of the main shaft 5 and penetrates through to the interior of the groove 15. The second set screw 16 is used for fixedly connecting the rotating end. The shape of the groove 15 is adapted to the shape of the rotating end. Usually, the rotating end is shaft-shaped, and the groove 15 can be cylindrical. The rotating end is inserted into the groove 15. By using the second set screw 16, it passes through the side of the main shaft 5 and its inner end is fixedly connected to the rotating end, so that the rotating end can be fixed inside the groove 15.

[0040] Specifically, both the first set screw 14 and the second set screw 16 are fasteners capable of locking and fixing, such as screws, etc.

[0041] To seal the gap between the main shaft 5 and the upper bearing block 1 and the lower bearing block 2 and prevent the grease from flowing out of this gap. In some embodiments, please refer to Figures 1 to 2 , second sealing rings 17 are respectively provided at both axial ends of the upper bearing block 1 along the main shaft 5. The second sealing rings 17 are used to seal the gap between the upper bearing block 1 and the main shaft 5. Third sealing rings 18 are respectively provided at both axial ends of the lower bearing block 2 along the main shaft 5. The third sealing rings 18 are used to seal the gap between the lower bearing block 2 and the main shaft 5. Both the second sealing rings 17 and the third sealing rings 18 are skeleton oil seals.

[0042] Preferably, along the axial direction of the main shaft 5, a sleeve 21 sleeved on the main shaft 5 is provided between the lower bearing 4 and the transmission gear 10. The third sealing ring 18 is sleeved on the outer circumference of the sleeve 21 and is used to seal the gap between the sleeve 21 and the lower bearing block 2. A stepped structure, such as a stepped shaft, is provided at the position of the main shaft 5 close to the small bearing block 6. From the middle of the main shaft 5 towards the end, the radius of the stepped shaft gradually decreases.

[0043] In some embodiments, please refer to Figures 1 to 2 , a base plate 19 is fixedly connected to the side of the heavy-duty car shunting machine. The upper bearing block 1, the lower bearing block 2, and the small bearing block 6 are all fixedly connected to the base plate 19. The base plate 19 can be installed and fixed on the side of the heavy-duty car shunting machine through multiple fasteners. The thickness of the base plate 19 is 30 mm and it is made of iron plate. The base plate 19 can also be connected by welding. Before welding, first determine the positional relationship between the transmission gear 10 and the traveling part of the heavy-duty car shunting machine. The height of the transmission gear 10 is basically in the middle position of the traveling part. By adjusting the gear meshing clearance between them, it is ensured that during the traveling process of the heavy-duty car shunting machine, there will be no blocking phenomenon and the bearing damage can be prevented. When the heavy-duty car shunting machine operates normally, the power is transmitted to the transmission gear 10 through the traveling part, then the transmission gear 10 drives the main shaft 5 to rotate. At this time, the photoelectric encoder 8 starts to count and transmits the data to the PLC control system, thereby accurately controlling the start and stop of the heavy-duty car shunting machine.

[0044] In some embodiments, please refer to Figures 1 to 2, a plurality of positioning screws 20 are connected to the substrate 19, and the plurality of positioning screws 20 are combined to form a clamping of the upper tile seat 1 and the lower tile seat 2 to fix the upper tile seat 1 and the lower tile seat 2. Two positioning screws 20 are provided at both the upper end and the lower end of the upper tile seat 1 and the lower tile seat 2. By screwing the plurality of positioning screws 20 arranged in an up-and-down manner, a clamping of the upper tile seat 1 and the lower tile seat 2 can be formed, and then the upper tile seat 1 and the lower tile seat 2 can be fixed on the substrate 19. At this time, it is not necessary to connect the upper tile seat 1 or the lower tile seat 2 to the substrate 19. The positioning screw 20 includes a nut welded to the substrate 19 and a screw rod screwed to the nut. By screwing the screw rod, the pushing of the upper tile seat 1 and the lower tile seat 2 can be realized.

[0045] The overall structure of the utility model is simple, the daily maintenance is relatively convenient, the sealing and dust-proof performance is good, it can effectively protect the upper bearing 3, the lower bearing 4 and the photoelectric encoder 8, is not easy to be damaged, and prolongs the service life. After the utility model is installed and used, the photoelectric encoder 8 counts accurately, the heavy car shunting machine can be accurately positioned, runs smoothly, and greatly improves the operation efficiency of the heavy car shunting machine. The overhaul and disassembly of the utility model are also relatively simple. First, remove the bolts on the joint surface of the small tile seat 6, remove the upper half of the bearing bush of the small tile seat 6, and then remove the bracket 13 of the photoelectric encoder 8, then the photoelectric encoder 8 can be disassembled. Then disassemble the upper half of the upper tile seat 1 and the lower tile seat 2, and the upper bearing 3 and the lower bearing 4 can be exposed, which is convenient for overhaul and maintenance. The whole overhaul process is extremely convenient. Compared with the existing walking master device, the overhaul time is greatly reduced and the work efficiency is improved.

[0046] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A walking master control device for a heavy-duty car shunting machine that is convenient for inspection and maintenance, characterized in that, Comprising: An upper bearing seat, connected to the side of the heavy car shunting machine, and having a split structure; A lower bearing seat, connected to the side of the heavy car shunting machine, having a split structure, spaced from the upper bearing seat, and both the upper bearing seat and the lower bearing seat have oil injection holes penetrating from the outside to the inside; An upper bearing, installed inside the upper bearing seat; A lower bearing, installed inside the lower bearing seat; A main shaft, passing through the upper bearing and the lower bearing, forming a rotational connection with the upper bearing and the lower bearing respectively. The upper bearing is used to bear the axial load of the main shaft, and the lower bearing is used to bear the radial load of the main shaft. One end of the main shaft is connected with a transmission gear, and the transmission gear is used to connect the walking part of the heavy car shunting machine; A small bearing seat, connected to the side of the heavy car shunting machine, having a split structure, and arranged near one end of the main shaft far from the transmission gear; A sealing device, connected inside the small bearing seat; An optical encoder, installed inside the sealing device. The optical encoder has a rotating end and a fixed end. The rotating end is used to connect one end of the main shaft far from the transmission gear, and the fixed end is used to fixedly connect the inner wall of the sealing device. The sealing device forms an enclosure for the optical encoder to seal the optical encoder.

2. The walking master control device of the heavy-duty car shunting machine for convenient maintenance as claimed in claim 1, wherein, The sealing device is a cylindrical body with one end open. The optical encoder is arranged inside the cylindrical body. The inner wall of the open end of the cylindrical body is nested with a first sealing ring. One end of the main shaft passes through the inside of the first sealing ring and is connected with the optical encoder. The first sealing ring is used to seal the gap between the sealing device and the main shaft.

3. The walking master device of the heavy-duty car dumper as claimed in claim 2, wherein, An installation hole is provided at one end of the cylindrical body far from the open end, and the wire harness connected to the optical encoder passes through the installation hole.

4. The walking master control device of the heavy car shunting machine for convenient maintenance as claimed in claim 2, wherein, A bracket is connected to the inner wall of the sealing device, and the bracket is used to fixedly connect the optical encoder.

5. The walking master control device of the heavy car shunting machine for convenient maintenance as described in claim 4, characterized in that, A through hole is provided on the side wall of the sealing device, and a first set screw is installed in the through hole. The first set screw is used to fixedly connect the bracket.

6. The walking master command device of the heavy-duty car dumper as described in claim 1, characterized in that, A groove extending along the axial direction is provided at the end of the main shaft. The rotating end of the optical encoder is inserted into the groove. A second set screw penetrating through the side of the main shaft to the inside of the groove is provided on the side of the main shaft. The second set screw is used to fixedly connect the rotating end.

7. The walking master control device of the heavy car shunting machine for convenient maintenance as described in claim 1, wherein, Second sealing rings are respectively provided at both ends of the upper bearing seat along the axial direction of the main shaft. The second sealing rings are used to seal the gap between the upper bearing seat and the main shaft.

8. The walking master control device of the heavy car shunting machine convenient for overhaul and maintenance according to claim 1, characterized in that, Third sealing rings are respectively provided at both ends of the lower bearing seat along the axial direction of the main shaft. The third sealing rings are used to seal the gap between the lower bearing seat and the main shaft.

9. The walking master device of the heavy-duty car dumper as claimed in claim 1, wherein, A substrate is fixedly connected to the side of the heavy car shunting machine. The upper bearing seat, the lower bearing seat and the small bearing seat are all fixedly connected to the substrate.

10. The walking master control device of the heavy-duty car dumper as described in claim 9, characterized in that, The substrate is connected with a plurality of positioning screws. The plurality of positioning screws are combined to form a clamping force on the upper bearing seat and the lower bearing seat to fix the upper bearing seat and the lower bearing seat.

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