A torsional vibration damper for automobile drive shaft assembly

Abstract

The present invention relates to the technical field of automobile transmission parts, and discloses a torsional vibration damper for automobile drive shaft assembly. The present invention comprises: a driven disc body, a shock absorber fixed disc and a driven disc hub arranged on the driven disc body, the driven disc body and the shock absorber fixed disc are provided with a plurality of elastic units in contact with the driven disc hub; the elastic unit comprises a cylinder body, a piston cylinder is slidably installed in the cylinder body, one end of the piston cylinder extends out of the cylinder body, a screw is rotatably arranged in the piston cylinder, a torsion groove is arranged on the screw rod, and a retractable torsion rod is arranged in the torsion groove, so that the torsion rod can drive the screw rod to rotate by retracting. The present invention can make the screw rod counteract the limiting protrusion after the spring is compressed to replace the spring to bear force, and relax the spring, so that the spring can be protected without affecting the shock absorption effect and its service life can be increased.

Description

Technical Field

[0001] The invention relates to the technical field of automobile transmission parts, and in particular to a torsional vibration damper for an automobile drive shaft assembly. Background Art

[0002] Torsional vibration dampers are mainly used to reduce torsional vibrations in the transmission system, protect various components of the vehicle and improve driving smoothness. They are mainly composed of a driven disc body, a driven disc hub and an elastic unit, and are equipped with friction plates, damping discs and other accessories. The elastic element is generally a spring (some also use rubber blocks for buffering), which is mainly used to reduce the torsional stiffness of the transmission system, change the natural frequency of the system, and avoid resonance caused by the main harmonic excitation of the engine torque.

[0003] During transmission, the drive shaft assembly drives the driven hub to rotate, and the driven hub then twists. During the twisting, the elastic unit (spring) is used as a transmission member to transmit the power to the driven hub body. During this process, the elastic unit will be squeezed and the torsional stiffness of the transmission system will be reduced through the elastic unit.

[0004] However, during the continuous transmission process of the torsional vibration damper, the elastic unit inside it will be continuously squeezed, and when the spring is compressed for a long time, its elasticity will gradually weaken (because continuous compression will cause fatigue damage to the spring material, thereby reducing its original elasticity). The rebound force of the shock absorber mainly depends on the spring. Once the spring elasticity decreases, the rebound force will be greatly reduced, resulting in a decrease in the performance of the shock absorber. At the same time, the decrease in its reverse thrust is likely to cause abnormal noise. Therefore, it is necessary to propose a torsional vibration damper for an automobile drive shaft assembly that can extend the service life of the spring. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a torsional vibration damper for an automobile drive shaft assembly.

[0006] The present invention is implemented by the following technical scheme: a driven disc body, a shock absorber fixing disc and a driven disc hub arranged on the driven disc body, wherein the driven disc body and the shock absorber fixing disc are provided with a plurality of elastic units in contact with the driven disc hub;

[0007] The elastic unit includes a cylinder body, in which a piston cylinder is slidably installed, one end of the piston cylinder extends outside the cylinder body, a screw is rotatably arranged in the piston cylinder, a torsion groove is arranged on the screw rod, and a retractable torsion rod is arranged in the torsion groove, so that the torsion rod can drive the screw rod to rotate by telescoping, a threaded sleeve on the screw rod is provided with a laterally movable abutment ring, one end of the cylinder body is provided with a limiting protrusion for limiting the torsion rod, and a main spring is arranged in the cylinder body, whose two ends respectively abut against the cylinder body and the abutment ring, so that after the elastic unit is squeezed, the piston cylinder will drive the abutment ring and the screw rod to move and squeeze the main spring, and the torsion rod will be pushed into the torsion groove after contacting the limiting protrusion, and in this process, the abutment ring is driven to move by the screw rod, so that the squeezed main spring can rebound and relax.

[0008] As a further improvement of the above scheme, a hexagonal groove is provided in the torsion rod, and a hexagonal rod is fixedly connected to the limiting protrusion. One end of the hexagonal rod extends into the hexagonal groove and is slidably connected to the hexagonal groove. In this way, the rotation of the torsion rod can be limited without affecting the normal extension and retraction of the torsion rod, so that the screw can be driven to rotate after being squeezed into the torsion groove by the limiting protrusion.

[0009] As a further improvement of the above scheme, the hexagonal rod consists of a rod body and a limiting block at one end of the rod body. The limiting block can slide in a limited manner in the hexagonal groove, so that after the screw is reset under the push of the main spring, the hexagonal rod can pull the torsion rod out of the torsion groove and drive the screw to reverse.

[0010] As a further improvement of the above scheme, a plurality of limiting grooves distributed in an annular shape are arranged on the outer ring of the resisting ring, and a plurality of limiting ribs distributed in an annular shape and matched with the plurality of limiting grooves are arranged in the piston cylinder, so that the resisting ring can be limited, so that the screw can smoothly drive the resisting ring to move when it rotates.

[0011] As a further improvement of the above solution, an annular groove is provided on one side of the butt ring, and one end of the main spring extends into the annular groove, thereby limiting one end of the main spring.

[0012] As a further improvement of the above solution, one end of the piston cylinder extending outside the cylinder body is hingedly connected with a first stop block, so that the piston cylinder can better contact with the driven hub through angle adjustment when it is twisted and squeezed by the driven hub.

[0013] As a further improvement of the above scheme, the part of the piston cylinder extending outside the cylinder body is sleeved with an auxiliary spring, and the two ends of the auxiliary spring respectively abut against one end of the cylinder body and the first abutment block, thereby increasing the thrust for resetting the piston cylinder and increasing the elastic force of the elastic unit.

[0014] As a further improvement of the above solution, a second stop block is hingedly connected to one end of the cylinder, so that the cylinder can better contact with the driven hub through angle adjustment when it is subjected to reverse twisting and extrusion of the driven hub.

[0015] As a further improvement of the above solution, a plurality of pairs of shifting blocks are provided on the driven hub, so as to increase the shifting area of ​​the driven hub on the elastic unit.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A new elastic unit composed of a cylinder, a piston cylinder, a screw, a torsion rod, a ring, a limiting convex block and other structures. Compared with the traditional spring, when the main spring is squeezed to the extreme, the screw and the limiting convex block can be abutted against each other, so that the subsequent squeezing force is shared from the main spring to the screw and the limiting convex block, thereby reducing the pressure on the main spring. In addition, the position of the ring can be adjusted synchronously to increase the rebound space of the main spring, so that the extremely compressed main spring can rebound, thereby protecting the main spring.

[0018] At the same time, compared with directly increasing the length of the limiting protrusion to prevent the main spring from being compressed to the extreme to protect the main spring, this structure can prevent the screw rod from having a hard contact with the limiting protrusion (the smaller the distance between the limiting protrusion and the screw rod, the smaller the space that the spring can be compressed, and the two are prone to collision due to insufficient spring reverse thrust), so that the performance limit of the spring can be fully utilized to reduce the torsional stiffness, and at the same time, it can also prevent the spring from being in an extreme compression state for a long time;

[0019] By arranging a hexagonal groove in the torsion rod and arranging a hexagonal rod that can match the hexagonal groove on the limiting protrusion, it is not only used to limit the rotation of the torsion rod, so that after the torsion rod is squeezed by the limiting protrusion and enters the torsion groove, it will not rotate itself, but will drive the screw rod to rotate along the trajectory to achieve the position adjustment of the ring. At the same time, the telescopic range of the torsion rod can also be limited, so that after the piston cylinder and other structures are pushed back and reset by the main spring and the auxiliary spring, the torsion rod will be pulled out of the torsion groove by the hexagonal rod, thereby driving the screw rod to reverse, thereby achieving the reset of the ring. Through the above structure, the main spring can be relaxed without the help of an external power device.

[0020] By adding an auxiliary spring, it can not only assist the main spring to increase the elastic force of the elastic unit, but also improve the reverse thrust effect on the piston cylinder, so that the piston cylinder has enough power to allow the torsion rod to drive the screw to rotate when resetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall display diagram of the torsional vibration damper for the automobile drive shaft assembly of the present invention;

[0022] Figure 2 It is a right-angle disassembled display diagram of the torsional vibration damper for the automobile drive shaft assembly of the present invention;

[0023] Figure 3 This is a disassembled display diagram from the left side of the torsional vibration damper for the automobile drive shaft assembly of the present invention;

[0024] Figure 4 It is a cross-sectional view showing an elastic unit in a torsional vibration damper for an automobile drive shaft assembly of the present invention;

[0025] Figure 5 It is a plane cross-sectional view showing an elastic unit in a torsional vibration damper for an automobile drive shaft assembly of the present invention;

[0026] Figure 6 This is a disassembled display diagram of the elastic unit in the torsional vibration damper for the automobile drive shaft assembly of the present invention;

[0027] Figure 7 This is a diagram showing the piston cylinder, screw rod and retaining ring in the elastic unit;

[0028] Figure 8 It is a display diagram and a cross-sectional display diagram between the torsion rod, the hexagonal rod and the limiting protrusion.

[0029] Description of main symbols:

[0030] 1. Moving plate body; 2. Shock absorber fixed plate; 3. Driven plate hub; 4. Cylinder body; 5. Piston cylinder; 6. First stop block; 7. Screw rod; 8. Torsion groove; 9. Torsion rod; 10. Stop ring; 11. Limiting protrusion; 12. Main spring; 13. Hexagonal rod; 14. Auxiliary spring; 15. Annular groove; 16. Limiting groove; 17. Limiting rib; 18. Second stop block; 19. Shift block. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Please combine Figures 1 to 8 The torsional vibration damper for automobile drive shaft assembly comprises: a driven disc body 1, a shock absorber fixing disc 2 and a driven disc hub 3 arranged on the driven disc body 1, and a plurality of elastic units in contact with the driven disc hub 3 are arranged on the driven disc body 1 and the shock absorber fixing disc 2;

[0033] The elastic unit includes a cylinder 4, which is composed of a cylinder body and a cylinder cover with a through hole, and the two are connected by a threaded connection. A piston cylinder 5 is slidably installed in the cylinder 4, and one end of the piston cylinder 5 extends to the outside of the cylinder 4. A plurality of limiting grooves 16 distributed in an annular shape are arranged on the outer ring of the butt ring 10, and a plurality of limiting ribs 17 distributed in an annular shape and matched with the plurality of limiting grooves 16 are arranged in the piston cylinder 5, so that the butt ring 10 can be limited, so that the screw rod 7 can smoothly drive the butt ring 10 to move when it rotates. A screw rod 7 is rotatably arranged in the piston cylinder 5, and a torsion groove 8 is arranged on the screw 7. A retractable torsion rod 9 is arranged in the torsion groove 8, so that the torsion rod 9 can drive the screw 7 to rotate by telescoping. The torsion groove 8 and the torsion rod 9 include but are not limited to rectangular torsion structures, and can also be set to other spiral torsion structures that can achieve this effect. The threaded part on the screw 7 A laterally movable retaining ring 10 is sleeved, and the inner ring of the retaining ring 10 is provided with an internal thread that can be adapted to the screw 7. A limiting protrusion 11 for limiting the torsion rod 9 is provided at one end of the cylinder 4. The limiting protrusion 11 can not only be used to limit the main spring 12, so as to maintain the stability of one end of the main spring 12 and prevent it from deflecting, but can also be used to resist the torsion rod 9 and the screw 7. A main spring 12 is provided in the cylinder 4, with its two ends respectively resting on the cylinder 4 and the retaining ring 10, so that after the elastic unit is squeezed, the first retaining block 6 will drive the piston cylinder 5, the retaining ring 10, the screw 7 and the torsion rod 9 to move and squeeze the main spring 12, and also allow the torsion rod 9 to be pushed into the torsion groove 8 after contacting the limiting protrusion 11, and in this process, the retaining ring 10 is driven to move by driving the screw 7 to rotate, so that the squeezed main spring 12 can rebound and relax.

[0034] Through the above technical scheme, a new elastic unit is formed. Compared with the traditional spring, when the main spring 12 is squeezed to the extreme, the screw rod 7 and the limiting protrusion 11 can be offset, so that the subsequent squeezing force is shared from the main spring 12 to the screw rod 7 and the limiting protrusion 11, thereby reducing the pressure on the main spring 12, and the position of the ring 10 can be adjusted synchronously to increase the rebound space of the main spring 12, so that the extremely compressed main spring 12 can rebound, thereby protecting the main spring 12. At the same time, compared with directly increasing the length of the limiting protrusion 11 to avoid the main spring 12 being compressed to the extreme to achieve protection of the main spring 12, this structure can avoid hard contact between the screw rod 7 and the limiting protrusion 11 (the smaller the distance between the limiting protrusion 11 and the screw rod 7, the smaller the space that can be compressed of the spring, and the two are prone to collision due to insufficient spring reverse thrust), so that the performance limit of the spring can be fully utilized to reduce the torsional stiffness, and at the same time, the spring can be prevented from being in an extremely compressed state for a long time.

[0035] Please combine Figure 8A hexagonal groove is provided in the torsion rod 9, and a hexagonal rod 13 is fixedly connected to the limiting protrusion 11. One end of the hexagonal rod 13 extends into the hexagonal groove and is slidably connected to the hexagonal groove, so that the rotation of the torsion rod 9 can be limited without affecting the normal extension and contraction of the torsion rod 9, so that it can drive the screw 7 to rotate after being squeezed into the torsion groove 8 by the limiting protrusion 11. The hexagonal rod 13 is composed of a rod body and a limiting block at one end of the rod body. The limiting block can be limited to slide in the hexagonal groove, so that after the screw 7 is reset under the push of the main spring 12, the hexagonal rod 13 can pull the torsion rod 9 out of the torsion groove 8 and drive the screw 7 to reverse.

[0036] Please combine Figures 5 to 7 An annular groove 15 is provided on one side of the butt ring 10 , and one end of the main spring 12 extends into the annular groove 15 , thereby limiting one end of the main spring 12 and maintaining the stability of the main spring 12 .

[0037] Please combine Figures 4 to 7 The piston cylinder 5 is extended to one end outside the cylinder body 4 and is hinged with a first stop block 6, so that the piston cylinder 5 can better contact with the driven hub 3 through angle adjustment when it is subjected to the torsion and extrusion of the driven hub 3. A second stop block 18 is hinged to one end of the cylinder body 4, so that the cylinder body 4 can better contact with the driven hub 3 through angle adjustment when it is subjected to the reverse torsion and extrusion of the driven hub 3. A plurality of pairs of shifting blocks 19 are provided on the driven hub 3, and the plurality of pairs of shifting blocks 19 are respectively in contact with the first stop blocks 6 and the second stop blocks 18 on the plurality of elastic units, so as to increase the shifting area of ​​the driven hub 3 to the elastic units.

[0038] Please combine Figure 4 and Figure 5 The part of the piston cylinder 5 extending outside the cylinder body 4 is sleeved with an auxiliary spring 14, and the two ends of the auxiliary spring 14 respectively abut against one end of the cylinder body 4 and the first abutment block 6, thereby increasing the thrust for resetting the piston cylinder 5 and increasing the elastic force of the elastic unit.

[0039] The implementation principle of a torsional vibration damper for a vehicle drive shaft assembly in the embodiment of the present application is:

[0040] When the driven hub 3 rotates forward, it will squeeze the first block 6 through the corresponding shift block 19. As the driven hub 3 rotates, the angle of the shift block 19 will tilt. At the same time, the first block 6 will also follow the shift block 19 to achieve adaptive angle adjustment.

[0041] After the first stopper 6 is squeezed, it will drive the stopper ring 10 and the torsion rod 9 to move through the piston cylinder 5. The stopper ring 10 will squeeze the main spring 12 as it moves. At the same time, the first stopper 6 will also squeeze the auxiliary spring 14. When the torsion rod 9 is close to the limiting protrusion 11, the main spring 12 is about to be compressed to the extreme, and the torsional stiffness of the transmission system is reduced in the process. Subsequently, when the torsion rod 9 is pushed into the torsion groove 8 by the limiting protrusion 11 and the limiting protrusion 11 contacts one end of the screw rod 7, the limiting protrusion 11 and the screw rod 7 are used to bear the squeezing force instead of the main spring 12. At the same time, when the torsion rod 9 enters the torsion groove 8, it will be affected by the trajectory and drive the screw rod 7 to rotate. The screw 7 will drive the stopper ring 10 to move by rotating, so that the main spring 12 that was squeezed to the extreme can be rebounded and extended, thereby reducing fatigue damage of the main spring 12 and increasing the service life of the main spring 12.

[0042] When the driving shaft stops transmitting the power to the driven hub 3, the torque is lost, and the main spring 12 and the auxiliary spring 14 can cooperate to push the piston cylinder 5 to reset. At the same time, the hexagonal rod 13 will limit the telescopic range of the torsion rod 9, so that after the screw rod 7 follows the piston cylinder 5 to reset, the torsion rod 9 will be pulled out of the torsion groove 8, and in the process, the reverse rotation of the retaining ring 10 will be realized, so that the retaining ring 10 can be reset.

[0043] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A torsional vibration damper for an automobile drive shaft assembly, comprising: A driven disc body (1), a shock absorber fixing disc (2) and a driven disc hub (3) arranged on the driven disc body (1), wherein the driven disc body (1) and the shock absorber fixing disc (2) are provided with a plurality of elastic units in contact with the driven disc hub (3), characterized in that: The elastic unit comprises a cylinder (4), a piston cylinder (5) is slidably mounted in the cylinder (4), one end of the piston cylinder (5) extends outside the cylinder (4), a screw rod (7) is rotatably arranged in the piston cylinder (5), a torsion groove (8) is arranged on the screw rod (7), and a retractable torsion rod (9) is arranged in the torsion groove (8), so that the torsion rod (9) can drive the screw rod (7) to rotate by being retracted; A laterally movable retaining ring (10) is provided on the threaded sleeve of the screw rod (7); a limiting protrusion (11) for limiting the torsion rod (9) is provided at one end of the cylinder (4); and a main spring (12) is provided in the cylinder (4), with two ends respectively abutting against the cylinder (4) and the retaining ring (10); As a result, after the elastic unit is squeezed, the piston cylinder (5) drives the retaining ring (10) and the screw rod (7) to move and squeeze the main spring (12), and the torsion rod (9) contacts the limiting protrusion (11) and is pushed into the torsion groove (8). In this process, the retaining ring (10) is driven to move by the screw rod (7), so that the squeezed main spring (12) can rebound and relax.

2. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: A hexagonal groove is provided in the torsion rod (9), and a hexagonal rod (13) is fixedly connected to the limiting protrusion (11). One end of the hexagonal rod (13) extends into the hexagonal groove and is slidably connected to the hexagonal groove, thereby limiting the rotation of the torsion rod (9) without affecting the normal extension and retraction of the torsion rod (9), so that the torsion rod (9) can drive the screw rod (7) to rotate after being squeezed into the torsion groove (8) by the limiting protrusion (11).

3. The torsional vibration damper for a vehicle drive shaft assembly according to claim 2, characterized in that: The hexagonal rod (13) is composed of a rod body and a limiting block at one end of the rod body, and the limiting block can slide in a limited manner in the hexagonal groove, so that after the screw rod (7) is reset under the push of the main spring (12), the hexagonal rod (13) can pull the torsion rod (9) out of the torsion groove (8) and drive the screw rod (7) to reverse.

4. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: The outer ring of the retaining ring (10) is provided with a plurality of limiting grooves (16) distributed in an annular shape, and the piston cylinder (5) is provided with a plurality of limiting ribs (17) distributed in an annular shape and matched with the plurality of limiting grooves (16), so that the retaining ring (10) can be limited, so that the screw rod (7) can smoothly drive the retaining ring (10) to move when rotating.

5. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: An annular groove (15) is provided on one side of the retaining ring (10), and one end of the main spring (12) extends into the annular groove (15), thereby limiting one end of the main spring (12).

6. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: One end of the piston cylinder (5) extending outside the cylinder body (4) is hingedly connected to a first stop block (6), so that when the piston cylinder (5) is subjected to twisting and squeezing of the driven disc hub (3), the angle of the piston cylinder (5) can be adjusted to better contact the driven disc hub (3).

7. The torsional vibration damper for a vehicle drive shaft assembly according to claim 6, characterized in that: The portion of the piston cylinder (5) extending outside the cylinder body (4) is sleeved with an auxiliary spring (14), and the two ends of the auxiliary spring (14) respectively abut against one end of the cylinder body (4) and the first abutment block (6), thereby increasing the thrust for resetting the piston cylinder (5) and increasing the elastic force of the elastic unit.

8. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: One end of the cylinder (4) is hingedly connected to a second stop block (18), so that the cylinder (4) can better contact the driven hub (3) through angle adjustment when the driven hub (3) is subjected to reverse twisting and squeezing.

9. The torsional vibration damper for a vehicle drive shaft assembly according to claim 1, characterized in that: A plurality of pairs of shifting blocks (19) are arranged on the driven disc hub (3), thereby increasing the shifting area of ​​the driven disc hub (3) on the elastic unit.

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