output shafting

Abstract

An output shaft system relates to the technical field of gearboxes, which comprises an output gear shaft, a support shaft, a tandem thrust bearing, a bushing, a pre-tightening thrust bearing assembly, an elastic piece, an anti-back piece and a first backing plate. The output gear shaft is connected with the support shaft; the tandem thrust bearing, the bushing and the pre-tightening thrust bearing assembly are sequentially sleeved outside the support shaft, the first backing plate is in contact with the side of the bushing away from the tandem thrust bearing, the bushing is rotatably matched with the support shaft; the anti-back piece is fixedly connected with the support shaft, and is located at the side of the pre-tightening thrust bearing assembly away from the tandem thrust bearing; the elastic piece is clamped between the bushing and the pre-tightening thrust bearing assembly; the end face of the first backing plate away from the bushing is provided as a first positioning face; the outer circumferential surface of the bushing is provided with a protrusion, and the side of the protrusion close to the tandem thrust bearing is provided as a second positioning face. It can reduce the axial gap, thereby reducing the axial displacement amount and the risk of screw damage.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more specifically, to an output shaft system. Background Technology

[0002] The main gearbox driving the petrochemical granulation and mixing mill includes two synchronous output shaft systems. Each shaft system needs to withstand the huge axial thrust F generated by the screw extruding material during operation. Therefore, a tandem thrust bearing is installed at the tail of the output shaft system specifically to withstand this axial thrust. The rolling elements of the tandem thrust bearing are cylindrical rollers. To avoid bearing failure caused by slippage and tailing effects of the rolling elements during operation, a large and stable axial preload must be applied to the tandem thrust bearing as required.

[0003] In traditional output shaft systems, the cylindrical roller thrust bearings used for preloading the tandem thrust bearings are placed on the output side. To prevent axial thermal expansion and seizing during gearbox operation, a certain axial clearance is required between the two locating end faces that restrict the two axial degrees of freedom of the shaft. The positions of the two locating end faces are determined by the positions of the tandem thrust bearings and the preload cylindrical roller thrust bearings. Because the preload cylindrical roller thrust bearings are placed on the output side, the distance between the two locating ends is increased, requiring a larger axial clearance, increasing the axial movement of the shaft, and increasing the risk of damage to the screw. Summary of the Invention

[0004] The present invention includes, for example, providing an output shaft system that can reduce the distance between two positioning end faces, reduce axial clearance, thereby reducing axial movement and lowering the risk of screw damage.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides an output shaft system, comprising: Output gear shaft, support shaft, tandem thrust bearing, bushing, preload thrust bearing assembly, elastic element, anti-reverse element, and first liner; The output gear shaft is coaxial with and fixedly connected to the support shaft; the tandem thrust bearing, the bushing, and the preload thrust bearing assembly are sequentially sleeved on the support shaft, the tandem thrust bearing is located on the side of the bushing closer to the output gear shaft, one end face of the bushing contacts the end face of the outer ring of the tandem thrust bearing, the first liner contacts the side of the bushing away from the tandem thrust bearing, and the bushing is rotatably fitted to the support shaft; the anti-retraction member is fixedly connected to the support shaft, and the anti-retraction member is located on the side of the preload thrust bearing assembly away from the tandem thrust bearing, used to limit the preload thrust bearing assembly from moving away from the tandem thrust bearing; the elastic element is clamped between the bushing and the preload thrust bearing assembly; The end face of the first liner away from the bushing is set as the first positioning surface; the outer peripheral surface of the bushing is provided with a protrusion, and the side of the protrusion near the tandem thrust bearing is set as the second positioning surface. Both the first positioning surface and the second positioning surface are located on the side of the tandem thrust bearing away from the output gear shaft.

[0006] In an optional embodiment, the output shaft system further includes a support bearing, the inner ring of which is sleeved and fixed outside the support shaft, and the bushing is sleeved and fixed outside the outer ring of the support bearing.

[0007] In an optional embodiment, the output shaft system further includes a disc spring assembly, one end face of which contacts the end face of the bushing away from the tandem thrust bearing, and the other end face of which contacts the end face of the first liner near the bushing.

[0008] In an optional embodiment, the end face of the preload thrust bearing assembly away from the tandem thrust bearing is spaced from the disc spring assembly.

[0009] In an optional embodiment, the output shaft system further includes an adjusting ring clamped between the bushing and the disc spring assembly.

[0010] In an optional embodiment, the preload thrust bearing assembly includes a fixed seat, a thrust bearing body, and a rotating seat. Both the fixed seat and the rotating seat are sleeved on the support shaft. The rotating seat is located on the side of the fixed seat away from the tandem thrust bearings and is fixedly connected to the support shaft. The anti-retraction member is located on the side of the rotating seat away from the fixed seat and contacts the rotating seat. The fixed seat is rotatably fitted to the support shaft. The outer ring of the thrust bearing body is fixedly connected to the rotating seat, and the inner ring of the thrust bearing body contacts the fixed seat. The elastic element is held between the fixed seat and the bushing.

[0011] In an optional embodiment, the output shaft system further includes a spacer ring, which is sleeved on the outside of the support shaft. One end of the spacer ring contacts the end face of the inner ring of the tandem thrust bearing, and the other end contacts the rotating seat.

[0012] In an optional embodiment, the elastic element is configured as a disc spring, and a second liner is provided between the elastic element and the bushing.

[0013] In an optional embodiment, the protrusion is configured as a ring structure, and the second positioning surface is configured as a ring surface.

[0014] In an optional embodiment, the bushing is provided with an oil injection hole.

[0015] The beneficial effects of the embodiments of the present invention include, for example: In summary, the output shaft system provided in this embodiment, by setting the preload thrust bearing assembly on the side of the tandem thrust bearing away from the output gear shaft, that is, arranging the preload thrust bearing assembly on the non-output side of the output shaft system, allows the first positioning surface that restricts the movement of the tandem thrust bearing along the first direction and the second positioning surface that restricts the movement of the preload thrust bearing assembly along the second direction opposite to the first direction to be arranged on the same side of the tandem thrust bearing. In this way, the distance between the first positioning surface and the second positioning surface can be effectively reduced, thereby reducing the axial clearance. This can both meet the axial deformation requirements due to thermal expansion during the operation of the output shaft system and reduce the axial movement, thereby reducing the risk of the screw being damaged due to large axial movement. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the output shaft system provided in this embodiment; Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 for Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0018] icon: 001-First direction; 002-Second direction; 100-Output gear shaft; 101-First end; 102-Second end; 110-Support shaft; 120-Tandem thrust bearing; 130-Bushing; 131-Oil injection hole; 132-Protrusion; 133-Second positioning surface; 140-Preload thrust bearing assembly; 141-Fixed seat; 142-Thrust bearing body; 143-Rotating seat; 150-Elastic element; 160-Anti-reverse element; 170-First liner; 171-First positioning surface; 180-Support bearing; 190-Disc spring assembly; 200-Adjusting ring; 210-Distance ring; 220-Second liner; 230-First bearing; 240-Second bearing; 250-Through cover; 260-Oil seal; 270-Baffle; 280-Locking screw. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Please refer to Figures 1-3This embodiment provides an output shaft system, which includes an output gear shaft 100, a support shaft 110, a tandem thrust bearing 120, a bushing 130, a preload thrust bearing assembly 140, an elastic element 150, an anti-retraction element 160, and a first bushing 170. The output gear shaft 100 is coaxial with and fixedly connected to the support shaft 110; the tandem thrust bearing 120, the bushing 130, and the preload thrust bearing assembly 140 are sequentially sleeved on the outside of the support shaft 110. The tandem thrust bearing 120 is located on the side of the bushing 130 near the output gear shaft 100, one end face of the bushing 130 contacts the end face of the outer ring of the tandem thrust bearing 120, and the first bushing 170 contacts the side of the bushing 130 away from the tandem thrust bearing 120. The bushing 130 is rotatably engaged with the support shaft 110; the anti-retraction element 160 is fixedly connected to the support shaft 110, and the anti-retraction element 160 is located on the side of the preload thrust bearing assembly 140. The bearing assembly 140 is located on the side away from the tandem thrust bearing 120, which is used to limit the preload thrust bearing assembly 140 from the tandem thrust bearing 120; the elastic element 150 is clamped between the bushing 130 and the preload thrust bearing assembly 140; the end face of the first liner 170 away from the bushing 130 is set as the first positioning surface 171; the outer peripheral surface of the bushing 130 is provided with a protrusion 132, and the side of the protrusion 132 near the tandem thrust bearing 120 is set as the second positioning surface 133. The first positioning surface 171 and the second positioning surface 133 are both located on the side of the tandem thrust bearing 120 away from the output gear shaft 100.

[0026] As described above, the working principle of the output axis provided in this embodiment is as follows: The output shaft system is assembled into the gearbox housing. The output gear shaft 100 extends out of the housing and can connect with the corresponding screw. When the output gear shaft 100 rotates, it can transmit torque to the screw, thereby driving the screw to rotate. At the same time, the first positioning surface 171 contacts the inner wall of the housing, and the second positioning surface 133 has a set axial clearance with the inner wall of the housing. This axial clearance can reserve space for the axial deformation caused by the expansion of the output shaft system. The axial clearance is determined by the shaft segment length between the first positioning surface 171 and the second positioning surface 133, and the two are positively correlated. The larger the shaft segment length, the greater the expansion, and the larger the required axial clearance. Because the preload thrust bearing assembly 140 is arranged on the non-output side of the output shaft system, the first positioning surface 171 and the second positioning surface 133 are both located on the side of the tandem thrust bearing 120 away from the output gear shaft 100. The distance between the first positioning surface 171 and the second positioning surface 133 is small, the shaft section size between the first positioning surface 171 and the second positioning surface 133 is small, and the amount of thermal expansion deformation is small. This makes the set gap smaller than the thermal expansion reserved gap of the traditional structure. The axial movement of the output shaft is small during thermal expansion deformation, and it is not easy to damage the screw.

[0027] The following embodiments illustrate the details of the output shaft system of this application by way of example.

[0028] Please refer to Figures 1-3 In this embodiment, optionally, the output shaft system includes an output gear shaft 100, a support shaft 110, a tandem thrust bearing 120, a bushing 130, a preload thrust bearing assembly 140, an elastic element 150, an anti-retraction element 160, a first liner 170, a support bearing 180, a disc spring assembly 190, an adjusting ring 200, a spacer ring 210, a second liner 220, a first bearing 230, a second bearing 240, a cover 250, an oil seal 260, and a baffle 270. The output gear shaft 100 has a first end 101 and a second end 102 that are axially opposite each other. The first end 101 is the output end, which can be connected to a corresponding screw to transmit torque. The second end 102 is the non-output end. The support shaft 110 can be fixedly connected to the non-output end of the output gear shaft 100 through a threaded component or other structure, and the support shaft 110 and the output gear shaft 100 rotate coaxially and synchronously. A tandem thrust bearing 120, a bushing 130, a preload thrust bearing assembly 140, and an anti-recoil element 160 are sequentially fitted onto the outside of the support shaft 110. The inner ring of the tandem thrust bearing 120 is interference-fitted with the support shaft 110, and the outer ring of the tandem thrust bearing 120 can be positioned by the gearbox housing. The anti-recoil element 160 is fixedly connected to the support shaft 110, and contacts the side of the preload thrust bearing assembly 140 away from the bushing 130. A spacer ring 210 is fitted and fixed onto the outside of the support shaft 110. One side of the spacer ring 210 contacts the end face of the inner ring of the tandem thrust bearing 120 away from the output gear shaft 100, and the other side of the spacer ring 210 contacts the preload thrust bearing assembly 140. The inner ring of the support bearing 180 is sleeved and fixed outside the spacer ring 210, and the outer ring of the support bearing 180 is embedded in the stepped inner hole of the bushing 130 and is interference-fitted with the bushing 130. Meanwhile, the outer circumferential surface of the bushing 130 can be positioned by the housing, so that when the support shaft 110 rotates, the bushing 130 can remain stationary under the action of the support bearing 180. The elastic element 150 and the second liner 220 are both located in the stepped inner hole of the bushing 130. The elastic element 150 and the second liner 220 are located on the side of the support bearing 180 away from the output gear shaft 100. Furthermore, the second liner 220 is located between the elastic element 150 and the support bearing 180. One side of the second liner 220 contacts the stepped surface of the stepped inner hole, and the other side contacts the elastic element 150. The elastic element 150 contacts the preload thrust bearing assembly 140.

[0029] Meanwhile, the adjusting ring 200, the disc spring assembly 190, and the first bushing 170 are arranged sequentially along the direction from the first end 101 to the second end 102. The adjusting ring 200 contacts the side of the bushing 130 away from the output gear shaft 100, one side of the disc spring assembly 190 contacts the adjusting ring 200, and the other side contacts the first bushing 170. The end face of the first bushing 170 away from the stacked ring assembly is set as the first positioning surface 171. The first positioning surface 171 can contact the inner wall of the gearbox, playing a limiting role. Since the disc spring assembly 190 does not directly contact the bushing 130, it can reduce the wear of the bushing 130 and extend the service life of the bushing 130.

[0030] Furthermore, a protrusion 132 is provided on the outer circumferential surface of the bushing 130. The protrusion 132 can be annular and can be integrated with the bushing 130, resulting in high structural strength, resistance to detachment and damage, and a long service life. The annular side of the protrusion 132 near the output gear shaft 100 is designated as the second positioning surface 133. The first positioning surface 171 is located on the side of the second positioning surface 133 away from the output gear shaft 100. Please refer to... Figure 1 and Figure 2 That is, the first positioning surface 171 is located to the left of the second positioning surface 133, and both are located on the side of the tandem thrust bearing 120 away from the output gear shaft 100.

[0031] Meanwhile, the first bearing 230 and the second bearing 240 are both sleeved on the outside of the output gear shaft 100. The first bearing 230 and the second bearing 240 are connected to the housing to support the output gear shaft 100. The through cover 250 is sleeved on the outside of the output gear shaft 100 and can be connected to the housing. An oil seal 260 is provided between the through cover 250 and the output gear shaft 100. A baffle 270 is provided on the outside of the through cover 250. The baffle 270 is located outside the oil seal 260 and can reduce the probability of external impurities entering the oil seal 260.

[0032] Please continue to combine Figure 1 and Figure 2It should be noted that when the output shaft system is engaged with the housing, the first end 101 extends out of the housing. The first end 101 serves as the output end and can be connected to the screw to achieve torque transmission. During the operation of the output shaft system, when it is subjected to an axial force to the left, i.e., in the first direction 001, the axial force is transmitted along the output gear shaft 100, support shaft 110, tandem thrust bearing 120, bushing 130, adjusting ring 200, disc spring assembly 190, and second liner 220. The first positioning surface 171 on the second liner 220 is restricted by the housing, and under the action of the first positioning surface 171, the output shaft system will not move to the left. When subjected to an axial force to the right, i.e., in the second direction 002, the axial force is transmitted along the output gear shaft 100, support shaft 110, anti-reverse component 160, preload thrust bearing assembly 140, elastic component 150, second liner 220 and bushing 130. The second positioning surface 133 on the bushing 130 is restricted by the housing. Under the action of the second positioning surface 133, the output shaft system will not move to the right, thereby making the axial position of the output shaft system stable and reliable.

[0033] It should be understood that both the first positioning surface 171 and the second positioning surface 133 are annular surfaces, with a large contact area with the corresponding position of the box body, resulting in a good positioning effect.

[0034] Optionally, an oil injection hole 131 can be provided on the bushing 130. The inlet of the oil injection hole 131 can be located on the outer peripheral surface of the bushing 130, and the outlet of the oil injection hole 131 can be located on the axial end face of the bushing 130 and the wall of the stepped inner hole. Lubricating oil can be injected through the oil injection hole 131 to effectively lubricate the tandem thrust bearing 120 and the preload thrust bearing assembly 140.

[0035] Optionally, the disc spring assembly 190 may include a plurality of disc springs arranged in sequence. For example, in this embodiment, the disc spring assembly 190 has three disc springs.

[0036] Optionally, the elastic element 150 can be a disc spring. Disc springs have high stiffness, small footprint, and strong load-bearing capacity, enabling them to handle larger preloads to meet the minimum preload requirements of the tandem thrust bearing 120. They also exhibit high stability under load, providing reliable preload. Furthermore, due to their small footprint, the bushing 130 has a smaller axial dimension, allowing the second positioning surface 133 on the bushing 130 to be closer to the first positioning surface 171. This further reduces the distance between the first positioning surface 171 and the second positioning surface 133, allowing for a smaller axial clearance and reducing the axial movement of the output shaft system.

[0037] Optionally, the number of the fixed-distance rings 210 can be one or more, depending on the design requirements, and no specific limitation is made in this embodiment.

[0038] In this embodiment, optionally, the preload thrust bearing assembly 140 includes a fixed seat 141, a thrust bearing body 142, and a rotating seat 143. Both the fixed seat 141 and the rotating seat 143 are sleeved on the outside of the support shaft 110. The rotating seat 143 is located on the side of the fixed seat 141 away from the tandem thrust bearing 120 and is fixedly connected to the support shaft 110. The rotating seat 143 contacts the spacer ring 210. The anti-retraction member 160 is located on the side of the rotating seat 143 away from the fixed seat 141 and contacts the rotating seat 143. This achieves axial positioning of the inner ring of the tandem thrust bearing 120, the spacer ring 210, the rotating seat 143, and the anti-retraction member 160. The fixed seat 141 is rotatably fitted to the support shaft 110. The outer ring of the thrust bearing body 142 is fixedly connected to the rotating seat 143, and the inner ring of the thrust bearing body 142 contacts the fixed seat 141. The elastic element 150 is clamped between the fixed seat 141 and the second liner 220. With this design, when the output gear shaft 100 rotates, the support shaft 110 rotates together, and drives the spacer ring 210, the rotating seat 143, the outer ring of the thrust bearing body 142 and the anti-reverse element 160 to rotate together.

[0039] The thrust bearing body 142 can be a cylindrical roller thrust bearing, etc.

[0040] Optionally, the anti-reverse component 160 can be a nut, which can be screwed onto the support shaft 110. Furthermore, in order to reduce the risk of the anti-reverse component 160 loosening and weaken the axial limiting effect, a locking screw 280 can be provided on the anti-reverse component 160. The locking screw 280 is screwed onto the anti-reverse component 160, and the end of the locking screw 280 abuts against the outer circumferential surface of the support shaft 110.

[0041] The output shaft system provided in this embodiment, by setting the preload thrust bearing assembly 140 on the side of the tandem thrust bearing 120 away from the output gear shaft 100, that is, arranging the preload thrust bearing assembly 140 on the non-output side of the output shaft system, allows the first positioning surface 171, which restricts the movement of the tandem thrust bearing 120 or the output shaft system along the first direction 001, and the second positioning surface 133, which restricts the movement of the preload thrust bearing assembly 140 or the output shaft system along the second direction 002, which is opposite to the first direction 001, to be arranged on the same side of the tandem thrust bearing 120. In this way, the distance between the first positioning surface 171 and the second positioning surface 133 can be effectively reduced, thereby reducing the axial clearance. This can both meet the axial deformation requirements due to thermal expansion during the operation of the output shaft system and reduce the axial movement, thereby reducing the risk of the screw being damaged due to large axial movement.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An output shaft system, characterized in that, include: Output gear shaft (100), support shaft (110), tandem thrust bearing (120), bushing (130), preload thrust bearing assembly (140), elastic element (150), anti-reverse element (160) and first liner (170). The output gear shaft (100) is coaxial with and fixedly connected to the support shaft (110); the tandem thrust bearing (120), the bushing (130), and the preload thrust bearing assembly (140) are sequentially sleeved on the outside of the support shaft (110). The tandem thrust bearing (120) is located on the side of the bushing (130) closer to the output gear shaft (100), and one end face of the bushing (130) contacts the end face of the outer ring of the tandem thrust bearing (120). The first bushing (170) and the bushing (130) are away from the tandem thrust bearing (120). The bushing (130) is rotatably engaged with the support shaft (110) on one side of the thrust bearing (120); the anti-retraction member (160) is fixedly connected to the support shaft (110), and the anti-retraction member (160) is located on the side of the preload thrust bearing assembly (140) away from the tandem thrust bearing (120) to limit the preload thrust bearing assembly (140) from moving away from the tandem thrust bearing (120); the elastic member (150) is clamped between the bushing (130) and the preload thrust bearing assembly (140); The end face of the first liner (170) away from the bushing (130) is set as a first positioning surface (171); the outer peripheral surface of the bushing (130) is provided with a protrusion (132), and the side of the protrusion (132) near the tandem thrust bearing (120) is set as a second positioning surface (133). The first positioning surface (171) and the second positioning surface (133) are both located on the side of the tandem thrust bearing (120) away from the output gear shaft (100).

2. The output shaft system according to claim 1, characterized in that: The output shaft system also includes a support bearing (180), the inner ring of which is sleeved and fixed outside the support shaft (110), and the bushing (130) is sleeved and fixed outside the outer ring of the support bearing (180).

3. The output shaft system according to claim 2, characterized in that: The output shaft system also includes a disc spring assembly (190), one end face of which contacts the end face of the bushing (130) away from the tandem thrust bearing (120), and the other end face of the disc spring assembly (190) contacts the end face of the first liner (170) near the bushing (130).

4. The output shaft system according to claim 3, characterized in that: The end face of the preload thrust bearing assembly (140) away from the tandem thrust bearing (120) is spaced from the disc spring assembly (190).

5. The output shaft system according to claim 3, characterized in that: The output shaft system also includes an adjusting ring (200) which is held between the bushing (130) and the disc spring assembly (190).

6. The output shaft system according to any one of claims 1-5, characterized in that: The preload thrust bearing assembly (140) includes a fixed seat (141), a thrust bearing body (142), and a rotating seat (143). The fixed seat (141) and the rotating seat (143) are both sleeved on the support shaft (110). The rotating seat (143) is located on the side of the fixed seat (141) away from the tandem thrust bearing (120) and is fixedly connected to the support shaft (110). The anti-retraction member (160) is located on the side of the rotating seat (143) away from the fixed seat (141) and is in contact with the rotating seat (143). The fixed seat (141) is rotatably engaged with the support shaft (110). The outer ring of the thrust bearing body (142) is fixedly connected to the rotating seat (143), and the inner ring of the thrust bearing body (142) is in contact with the fixed seat (141). The elastic element (150) is held between the fixed seat (141) and the bushing (130).

7. The output shaft system according to claim 6, characterized in that: The output shaft system also includes a spacer ring (210), which is sleeved on the outside of the support shaft (110). One end of the spacer ring (210) contacts the end face of the inner ring of the tandem thrust bearing (120), and the other end contacts the rotating seat (143).

8. The output shaft system according to any one of claims 1-5, characterized in that: The elastic element (150) is configured as a disc spring, and a second liner (220) is provided between the elastic element (150) and the bushing (130).

9. The output shaft system according to any one of claims 1-5, characterized in that: The protrusion (132) is configured as a ring structure, and the second positioning surface (133) is configured as a ring surface.

10. The output shaft system according to any one of claims 1-5, characterized in that: The bushing (130) is provided with an oil injection hole (131).

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