Center support device for drive shaft

Abstract

This application provides a center support device for a drive shaft, relating to the field of drive shaft technology. The center support device for a drive shaft includes a vertically arranged bearing housing. The bearing bore of the bearing housing is filled with a buffer rubber, which is circular in shape and coaxial with the bearing bore. A fixing structure is provided on the outer side of the bearing housing to secure the buffer rubber. A locking structure is provided on the inner ring of the buffer rubber. The locking structure includes a cylinder, a ball bearing, and multiple locking flaps. The cylinder is embedded and fixed within the inner ring of the buffer rubber. Multiple positioning blocks are fixed inside the cylinder, equidistantly distributed in a ring around its central axis. The multiple locking flaps can form a complete cylinder. Both ends of the cylinder are provided with meshing structures to engage the locking flaps. This invention eliminates the need for hammering during ball bearing installation, preventing bearing deformation due to hammering and improving bearing life.

Description

Technical Field

[0001] This invention belongs to the field of transmission shaft technology, and particularly relates to a center support device for transmission shafts. Background Technology

[0002] With the increasing prevalence of automobiles, frequent traffic accidents seriously affect the personal safety of drivers and passengers. The driveshaft is a crucial component of a car; it is a shaft that transmits power and a high-speed, low-support rotating body. Therefore, its dynamic balance is paramount. If the power transmitted in the transmission system is over a long distance, an intermediate support with a buffer mechanism is usually installed on the driveshaft. The main function of the intermediate support is to compensate for installation errors in the axial and angular directions of the driveshaft, as well as displacement caused by engine surging and chassis deformation. In existing automotive driveshaft support assemblies, the bearings are easily damaged by the torque of the driveshaft over a long period of time. This can lead to pitting, peeling, or even disintegration of the bearings, causing abnormal transmission noise and vehicle malfunctions, affecting the normal operation of the vehicle. Therefore, the bearings often need to be replaced.

[0003] In the prior art (publication number CN 111873795 A, patent application titled "A Bladder-Type Intermediate Support Device for Commercial Vehicle Driveshaft, Assembly Method, and Usage Method"), the radial stiffness of the support assembly is adjusted by regulating the air pressure of the bladder, thereby adjusting the natural frequency of the support assembly, avoiding or disrupting the resonant frequency, and improving the overall vehicle driving comfort. Simultaneously, this device effectively solves the heat dissipation problem of vulcanized rubber supports, extending the bearing's service life. However, in implementing this technical solution, at least the following problems were found in the prior art.

[0004] In most transmission shaft support assemblies, the bearings are fixed to the bearing housing by hammering. This hammering method can easily cause the bearings to deform, which in turn affects their service life and fails to meet the usage requirements. Summary of the Invention

[0005] This application aims to address at least one of the technical problems in the prior art where bearings in drive shaft support assemblies are mostly fixed to the bearing housing by hammering. This hammering installation method is prone to bearing deformation, which affects the bearing's service life and fails to meet usage requirements. Therefore, this application proposes a center support device for drive shafts.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0007] A central support device for a drive shaft includes a vertically arranged bearing housing. The bearing bore of the bearing housing is filled with a buffer rubber, which is circular in shape and coaxial with the bearing bore. A fixing structure is provided on the outer side of the bearing housing to fix the buffer rubber. A locking structure is provided on the inner ring of the buffer rubber. The locking structure includes a cylinder, ball bearings, and multiple locking flaps. The cylinder is embedded and fixed in the inner ring of the buffer rubber. Multiple positioning blocks are fixed inside the cylinder and are equidistantly distributed in a ring with their central axis as the center. The multiple locking flaps can form a complete cylinder. Both ends of the cylinder are provided with meshing structures to make the locking flaps fit together. The outer side of the locking flap has an insertion hole, and the locking flap slides on the positioning block through the insertion hole. The inner side of the locking flap has a groove coaxial with it, and the ball bearing is disposed in each groove.

[0008] Preferably, the bottom sides of the bearing housing extend outward to form positioning ears, and the top of the positioning ears is provided with positioning holes.

[0009] Preferably, the outer peripheral wall of the buffer adhesive fits into the inner wall of the bearing hole of the bearing housing, and both annular surfaces of the buffer adhesive are provided with deformation grooves that are annular and coaxial with the buffer adhesive.

[0010] Preferably, the fixing structure includes a front ring cover, a rear ring cover, and a plurality of hexagonal screws. The front ring cover and the rear ring cover cover the front and rear ends of the bearing housing, respectively, and both the front ring cover and the rear ring cover are coaxially arranged with the bearing hole of the bearing housing. The rods of the plurality of hexagonal screws are slidably inserted into the front ring cover, the rear ring cover, and the bearing housing. The plurality of hexagonal screws are distributed in a ring at equal intervals around the central axis of the bearing housing. A locking nut is threaded onto one end of the rod of each hexagonal screw.

[0011] Preferably, the fixing structure further includes multiple positioning rods, one end of each positioning rod is fixed to the front end ring cover, and each positioning rod is distributed in a ring at equal intervals with the central axis of the front end ring cover as the center. The annular surface of the buffer rubber has multiple through holes distributed in a ring at equal intervals with its central axis as the center near the edge. Each positioning rod is slidably inserted into each of the through holes. The annular surface of the rear end ring cover has multiple through holes, and one end of each positioning rod is slidably inserted into the corresponding through hole.

[0012] Preferably, the annular surface of the front end cover is provided with a plurality of hexagonal slots, and the plurality of hexagonal slots are respectively coaxially arranged with a plurality of hexagonal screws in pairs, with the hexagonal screw head of the hexagonal screw embedded in the corresponding hexagonal slot.

[0013] Preferably, the edges of one end of the positioning block are rounded.

[0014] Preferably, the meshing structure includes a locking ring, one side of which is fixed with an external threaded ring coaxially arranged. The outer side of the external threaded ring is threaded onto one end of the cylinder. The inner ring of the external threaded ring has an inner conical surface, and both ends of the locking disc have cones that are adapted to the inner conical surface.

[0015] Preferably, a limiting structure is provided on the outer side of the locking ring. The limiting structure includes a movable ring and a plurality of inserts. The movable ring is coaxially arranged with the locking ring. One end of each insert is fixed to the movable ring. The entire insert is slidably inserted into the locking ring. A plurality of limiting holes are provided at one end of the cylinder. The other end of each insert is slidably inserted into the limiting holes. The locking ring is provided with an elastic structure that causes the insert to move toward the cylinder.

[0016] Preferably, the elastic structure includes a spring and a limiting ring. The locking ring has a recessed groove on the side facing the cylinder. The insert is located in the recessed groove. The insert and the limiting ring are coaxially arranged. The spring is sleeved on the insert. The two ends of the spring are in contact with the limiting ring and the recessed groove, respectively.

[0017] The center support device for the drive shaft of the present invention has the following advantages:

[0018] 1. When replacing the bearings of this drive shaft using the center support device, simply disassemble the meshing structure. At this time, the locking discs are not held together by external force and can slide along the positioning block. Then, push the locking discs outward, and the grooves on the locking discs separate from the ball bearings, thus disengaging the ball bearings. Place the new ball bearings between the grooves of the locking discs, reinstall the meshing structure, and the locking discs will reassemble into a complete cylinder, meshing the ball bearings in the grooves. Therefore, no hammering is required during the installation of the ball bearings, preventing bearing deformation due to hammering and improving the service life of the bearings.

[0019] 2. The buffer rubber of the central support device for the drive shaft is not an integral structure with the bearing housing, but is fixed by a fixing structure. Therefore, the buffer rubber can be removed from the bearing housing and replaced. Compared with the prior art, where the buffer rubber is embedded and fixed in the hole of the bearing housing, the detachable design is to facilitate subsequent replacement and reduce replacement costs. Attached Figure Description

[0020] 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 of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the front ring cover of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the rear ring cover of the present invention;

[0025] Figure 5 This is a three-dimensional structural diagram of the locking structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the locking structure of the present invention;

[0027] Figure 7 for Figure 6 A magnified structural diagram at point A;

[0028] Figure 8 This is a first-view perspective three-dimensional structural diagram of the locking flap of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the locking flap from a second perspective of the present invention;

[0030] Figure 10 This is a schematic diagram of the three-dimensional structure of the locking ring of the present invention;

[0031] Figure 11 This is a schematic diagram of the cylindrical three-dimensional structure of the present invention.

[0032] The markings in the diagram are as follows: 1. Bearing housing; 2. Front ring cover; 3. Rear ring cover; 4. Hexagonal screw; 5. Locking nut; 6. Positioning ear; 7. Positioning hole; 8. Buffer rubber; 9. Locking structure; 901. Locking ring; 902. Locking flap; 903. Insertion hole; 904. Conical head; 905. Groove; 906. External threaded ring; 907. Internal conical surface; 908. Positioning block; 909. Cylinder; 10. Deformation groove; 11. Through hole; 12. Hexagonal slot; 13. Positioning rod; 14. Through hole; 15. Ball bearing; 16. Limiting structure; 1601. Moving ring; 1602. Insertion post; 1603. Spring; 1604. Limiting ring; 1605. Recessed groove; 1606. Limiting hole. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-11As shown, the transmission shaft center support device of the present invention includes a vertically arranged bearing seat 1. The bearing hole of the bearing seat 1 is filled with a buffer rubber 8. The buffer rubber 8 is generally annular and coaxially arranged with the bearing hole. A fixing structure for fixing the buffer rubber 8 is provided on the outer side of the bearing seat 1. A locking structure 9 is provided on the inner ring of the buffer rubber 8. The locking structure 9 includes a cylinder 909, a ball bearing 15, and a plurality of locking flaps 902. The cylinder 909 is embedded and fixed in the inner ring of the buffer rubber 8. The cylinder 909 has multiple positioning blocks 908 fixed inside, which are equidistantly distributed in a ring with their central axis as the center. The multiple locking flaps 902 can form a complete cylinder. Both ends of the cylinder 909 are provided with meshing structures that allow the locking flaps 902 to fit together. The outer side of the locking flap 902 is provided with an insertion hole 903, and the locking flap 902 is slidably sleeved on the positioning block 908 through the insertion hole 903. The inner side of the locking flap 902 is provided with a groove 905 coaxially arranged with it, and the ball bearing 15 is arranged in each groove 905.

[0035] As can be seen from the above connection relationship, when replacing the ball bearing 15, the bearing housing 1 is removed from the chassis of the car, and then the meshing structure is removed. At this time, the locking petals 902 are not held together by external force, and the locking petals 902 can slide along the positioning block 908. Then, the locking petals 902 are pushed outward, and the grooves 905 on the locking petals 902 separate from the ball bearing 15, so that the ball bearing 15 is dislodged. The new ball bearing 15 is placed between the grooves 905 of the locking petals 902, and the meshing structure is installed. The locking petals 902 are reassembled into a complete cylinder, and the ball bearing 15 is meshed in the grooves 905. Therefore, it can be seen that no hammering is required during the installation of the ball bearing 15, which prevents the bearing from being deformed by hammering and improves the service life of the bearing.

[0036] Preferred, combined with appendix Figure 1 As shown, the bottom sides of the bearing seat 1 extend outward to form positioning ears 6, and the top of the positioning ears 6 is provided with positioning holes 7;

[0037] As can be seen from the above connection relationship, the positioning ear 6 and the positioning hole 7 are designed to facilitate the entire device to be fixed to the car by fixing bolts.

[0038] Preferred, combined with appendix Figure 1 and appendix Figure 2 As shown, the outer peripheral wall of the buffer adhesive 8 is in contact with the inner wall of the bearing hole of the bearing seat 1, and both annular surfaces of the buffer adhesive 8 are provided with deformation grooves 10 that are annular and coaxial with it.

[0039] As can be seen from the above connection relationship, the buffer rubber 8 is generally a shock-absorbing rubber, which is existing technology. Its specific structure and working principle will not be described in detail here. The deformation groove 10 is set so that the inner ring of the buffer rubber 8 can move eccentrically.

[0040] Preferred, combined with appendix Figure 1 - Appendix Figure 4 As shown, the fixing structure includes a front ring cover 2, a rear ring cover 3, and multiple hexagonal screws 4. The front ring cover 2 and the rear ring cover 3 respectively cover the front and rear ends of the bearing seat 1, and both the front ring cover 2 and the rear ring cover 3 are coaxially arranged with the bearing hole of the bearing seat 1. The rods of the multiple hexagonal screws 4 are slidably inserted into the front ring cover 2, the rear ring cover 3, and the bearing seat 1. The multiple hexagonal screws 4 are distributed in a ring at equal intervals around the central axis of the bearing seat 1. A locking nut 5 is threaded onto one end of the rod of each hexagonal screw 4. The fixing structure also includes multiple positioning rods 13, one end of each positioning rod 13 is fixed to the front end ring cover 2, and each positioning rod 13 is distributed in a ring at equal intervals with the central axis of the front end ring cover 2 as the center. The annular surface of the buffer rubber 8 is provided with multiple through holes 11 distributed in a ring at equal intervals with the central axis as the center near the edge. The entire positioning rod 13 is slidably inserted into each through hole 11. The annular surface of the rear end ring cover 3 is provided with multiple through holes 14, and one end of each positioning rod 13 is slidably inserted into the corresponding through hole 14.

[0041] As can be seen from the above connection relationship, when replacing the buffer rubber 8, each locking nut 5 is removed, then each hexagonal screw 4 is pulled out, the rear end ring cover 3 is removed, and the front end ring cover 2 is pulled out so that each positioning rod 13 on the front end ring cover 2 is pulled out from the buffer rubber 8. It can be seen that the buffer rubber 8 and the bearing seat 1 are not an integral structure, but are fixed together by a fixing structure. Therefore, the buffer rubber 8 can be removed from the bearing seat 1 and can be replaced. The buffer rubber 8 is embedded and fixed in the hole of the bearing seat 1. The detachable design is to facilitate subsequent replacement and reduce replacement costs.

[0042] Preferred, combined with appendix Figure 1 - Appendix Figure 3 As shown, the annular surface of the front end cover 2 is provided with a plurality of hexagonal slots 12, and the plurality of hexagonal slots 12 are respectively coaxially arranged with a plurality of hexagonal screws 4 in pairs, and the hexagonal screw head of the hexagonal screw 4 is embedded in the corresponding hexagonal slot 12;

[0043] As can be seen from the above connection relationship, the hexagonal slot 12 is set to prevent the hexagonal screw 4 from rotating, because the rotation of the hexagonal screw 4 will cause the locking nut 5 to loosen, thus causing it to become loose.

[0044] Preferred, combined with appendix Figure 11As shown, the edges of one end of the positioning block 908 are all rounded.

[0045] As can be seen from the above connection relationship, the rounded corners are designed to facilitate the insertion of the positioning block 908 into the socket 903.

[0046] Preferred, combined with appendix Figure 6 - Appendix Figure 11 As shown, the meshing structure includes a locking ring 901. An external threaded ring 906 is fixed on one side of the locking ring 901 and is coaxially arranged with it. The outer side of the external threaded ring 906 is threaded onto one end of the cylinder 909. The inner ring of the external threaded ring 906 has an inner conical surface 907. Both ends of the locking flap 902 have cone heads 904 that are adapted to the inner conical surface 907.

[0047] As can be seen from the above connection relationship, when locking, the locking ring 901 is installed inside the cylinder 909 through the external threaded ring 906. The inner conical surface 907 of the locking ring 901 contacts the conical head 904 of each locking flap 902, so that each locking flap 902 fits together to form a complete cylinder.

[0048] Preferred, combined with appendix Figure 6 and attached Figure 7 As shown, a limiting structure 16 is provided on the outer side of the locking ring 901. The limiting structure 16 includes a movable ring 1601 and a plurality of inserts 1602. The movable ring 1601 is coaxially arranged with the locking ring 901. One end of each insert 1602 is fixed to the movable ring 1601, and the entire insert 1602 is slidably inserted into the locking ring 901. A plurality of limiting holes 1606 are provided at one end of the cylinder 909, and the other end of each insert 1602 is slidably inserted into the limiting holes 1606. The locking ring 901 is provided with an elastic structure that moves the insertion post 1602 toward the cylinder 909. The elastic structure includes a spring 1603 and a limiting ring 1604. The locking ring 901 has a recessed groove 1605 on the side facing the cylinder 909. The insertion post 1602 is located in the recessed groove. The insertion post 1602 and the limiting ring 1604 are coaxially arranged. The spring 1603 is sleeved on the insertion post 1602. The two ends of the spring 1603 are in contact with the limiting ring 1604 and the hole of the groove 905, respectively.

[0049] As can be seen from the above connection relationship, when the locking ring 901 is disassembled, the moving ring 1601 is pulled outward by an external force. At this time, each of the insert pins 1602 on the moving ring 1601 is pulled out of the limiting hole 1606. The limiting ring 1604 on the insert pin 1602 compresses the spring 1603, and the locking ring 901 is rotated. The external threaded ring 906 on the locking ring 901 is disengaged from the cylinder 909 by means of the thread. It can be seen that the limiting structure 16 can prevent the locking ring 901 from rotating relative to the cylinder 909, thereby ensuring that the external threaded ring 906 on the locking ring 901 keeps each locking piece 902 in contact with each other at all times.

[0050] Working principle of the center support device for drive shaft:

[0051] When replacing the ball bearing 15, the bearing housing 1 is removed from the vehicle chassis. The moving ring 1601 is pulled outwards by external force. At this time, the various inserts 1602 on the moving ring 1601 are pulled out of the limiting holes 1606. The limiting rings 1604 on the inserts 1602 compress the springs 1603. The locking ring 901 is rotated, and the external threaded ring 906 on the locking ring 901 disengages from the cylinder 909 via the threads. At this time, the locking discs 902 are not held together by external force and can slide along the positioning block 908. Then, the locking discs 902 are pushed outwards, and the grooves 905 on the locking discs 902... The ball bearings 15 are separated, thus disengaging the ball bearings 15. A new ball bearing 15 is placed between the grooves 905 of each locking disc 902. The locking ring 901 is then installed. The locking ring 901 is installed inside the cylinder 909 through the external threaded ring 906. The inner conical surface 907 of the locking ring 901 contacts the conical head 904 of each locking disc 902, thereby causing the locking discs 902 to fit together and form a complete cylinder, which engages the ball bearing 15 in the groove 905. Thus, it can be seen that no hammering is required during the installation of the ball bearing 15, preventing the bearing from deforming due to hammering and improving the service life of the bearing.

[0052] When replacing the buffer rubber 8, remove each locking nut 5, then pull out each hexagonal screw 4, remove the rear end ring cover 3, and pull out the front end ring cover 2 so that each positioning rod 13 on the front end ring cover 2 is pulled out from the buffer rubber 8. It can be seen that the buffer rubber 8 and the bearing seat 1 are not an integral structure, but are fixed together by a fixing structure. Therefore, the buffer rubber 8 can be removed from the bearing seat 1 and replaced. The buffer rubber 8 is embedded and fixed in the hole of the bearing seat 1. The detachable design is to facilitate subsequent replacement and reduce replacement costs.

[0053] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A center support device for a drive shaft, comprising a vertically arranged bearing housing (1), characterized in that: The bearing bore of the bearing housing (1) is filled with buffer rubber (8). The buffer rubber (8) is circular in shape and coaxial with the bearing bore. The outer side of the bearing housing (1) is provided with a fixing structure to fix the buffer rubber (8). The inner ring of the buffer rubber (8) is provided with a locking structure (9). The locking structure (9) includes a cylinder (909), a ball bearing (15), and multiple locking flaps (902). The cylinder (909) is embedded and fixed in the inner ring of the buffer rubber (8). Multiple locking flaps are fixed inside the cylinder (909) with their central axis as the center. The positioning blocks (908) are distributed in an equidistant ring. Multiple locking petals (902) can form a complete cylinder. Both ends of the cylinder (909) are provided with meshing structures that allow the locking petals (902) to fit together. The outer side of the locking petal (902) is provided with a socket (903), and the locking petal (902) is slidably sleeved on the positioning block (908) through the socket (903). The inner side of the locking petal (902) is provided with a groove (905) coaxially arranged with it, and the ball bearing (15) is arranged in each groove (905).

2. The center support device for the transmission shaft according to claim 1, characterized in that: The bottom sides of the bearing housing (1) extend outward to form positioning ears (6), and the top of the positioning ears (6) is provided with positioning holes (7).

3. The center support device for the transmission shaft according to claim 2, characterized in that: The outer peripheral wall of the buffer adhesive (8) is in contact with the inner wall of the bearing hole of the bearing seat (1), and both annular surfaces of the buffer adhesive (8) are provided with deformation grooves (10) that are annular and coaxial with it.

4. The center support device for the transmission shaft according to claim 3, characterized in that: The fixing structure includes a front ring cover (2), a rear ring cover (3), and a plurality of hexagonal screws (4). The front ring cover (2) and the rear ring cover (3) cover the front and rear ends of the bearing seat (1), respectively. The front ring cover (2) and the rear ring cover (3) are coaxially arranged with the bearing hole of the bearing seat (1). The rods of the plurality of hexagonal screws (4) are slidably inserted into the front ring cover (2), the rear ring cover (3), and the bearing seat (1). The plurality of hexagonal screws (4) are distributed in a ring at equal intervals with the central axis of the bearing seat (1) as the center. A locking nut (5) is threaded onto one end of the rod of the hexagonal screw (4).

5. The center support device for the transmission shaft according to claim 4, characterized in that: The fixing structure also includes multiple positioning rods (13), one end of each positioning rod (13) is fixed on the front end ring cover (2), and each positioning rod (13) is distributed in a ring at equal distances with the central axis of the front end ring cover (2) as the center. The ring surface of the buffer rubber (8) is provided with multiple through holes (11) distributed in a ring at equal distances with its central axis as the center near the edge. The entire positioning rod (13) is slidably inserted into each through hole (11). The ring surface of the rear end ring cover (3) is provided with multiple through holes (14), and one end of each positioning rod (13) is slidably inserted into the corresponding through hole (14).

6. The center support device for the transmission shaft according to claim 4, characterized in that: The front end ring cover (2) has multiple hexagonal slots (12) on its annular surface. The multiple hexagonal slots (12) are coaxially arranged with a pair of multiple hexagonal screws (4). The hexagonal screw head of the hexagonal screw (4) is embedded in the corresponding hexagonal slot (12).

7. The center support device for the transmission shaft according to claim 1, characterized in that: The edge of one end of the positioning block (908) is rounded.

8. The center support device for the transmission shaft according to claim 7, characterized in that: The meshing structure includes a locking ring (901), on one side of the locking ring (901) is a coaxially arranged external threaded ring (906), the outer side of the external threaded ring (906) is threaded onto one end of the cylinder (909), the inner ring of the external threaded ring (906) is provided with an inner conical surface (907), and both ends of the locking flap (902) are provided with cones (904) that are adapted to the inner conical surface (907).

9. The center support device for the transmission shaft according to claim 8, characterized in that: The locking ring (901) has a limiting structure (16) on its outer side. The limiting structure (16) includes a moving ring (1601) and a plurality of inserts (1602). The moving ring (1601) is coaxially arranged with the locking ring (901). One end of the insert (1602) is fixed on the moving ring (1601). The insert (1602) is slidably inserted into the locking ring (901). A plurality of limiting holes (1606) are opened at one end of the cylinder (909). The other end of the insert (1602) is slidably inserted into the limiting hole (1606). The locking ring (901) is provided with an elastic structure that allows the insert (1602) to move toward the cylinder (909).

10. The center support device for the transmission shaft according to claim 9, characterized in that: The elastic structure includes a spring (1603) and a limiting ring (1604). The locking ring (901) has a recessed groove (1605) on the side facing the cylinder (909). The insert (1602) is located in the recessed groove. The insert (1602) and the limiting ring (1604) are coaxially arranged. The spring (1603) is sleeved on the insert (1602). The two ends of the spring (1603) are in contact with the limiting ring (1604) and the groove (905) hole, respectively.

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