Tensioning wheel with bidirectional damping

Abstract

The utility model provides a tensioning wheel with bidirectional damping, which comprises a fixed base and a swing arm which is matched with the base and can swing around an axis, an elastic piece which is used for pressing the swing arm in a bias mode is arranged between the base and the swing arm so that the swing arm tends to deflect towards a transmission piece, and a belt wheel which rotates around the axis of the belt wheel is arranged at one end, away from the axis, of the swing arm. And the damping assembly comprises a damping ring and an abutting piece. In the loading direction and the unloading direction, damping can be generated in the two directions through the action of the damping ring and the abutting and pushing piece, and the damping magnitude in different directions can be adjusted by adjusting the sizes and angles of the abutting and pushing face and the stopping face.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of tensioning pulleys with bidirectional damping. BACKGROUND

[0002] Most internal combustion engines for automobiles and the like include a belt-driven accessory system, which is necessary for proper operation of the vehicle. The accessory system can include an alternator, an air conditioning compressor, and a power steering pump, among others.

[0003] The accessory system is typically mounted at the front end of the engine. Each accessory has a pulley mounted on a shaft for receiving power from the belt drive. In order to operate properly, the belt is installed with a predetermined tension. When the engine is running, the belt is slightly stretched beyond its predetermined length, either overall or in part, which will result in a decrease in belt tension, possibly causing the belt to slip. Therefore, a belt tensioner is used to maintain proper belt tension as the belt stretches during use.

[0004] When the belt tensioner is operating, the operating belt can excite vibrations in the spring of the tensioner, which are undesirable because they can cause belt and tensioner wear, as well as system vibration and noise. In operation, the swing arm can oscillate about the oscillation axis, and this oscillation can occur in both directions of swing of the swing arm.

[0005] There is a need for a tensioner with bidirectional damping to dampen the vibrations in the operation of the tensioner. SUMMARY

[0006] The technical problem solved by the present application is to provide a tensioner with bidirectional damping.

[0007] To solve the above-mentioned technical problems, this invention provides a tensioning wheel with bidirectional damping, comprising a fixed base, a swing arm that cooperates with the base and can swing about an axis, an elastic element that biases the swing arm between the base and the swing arm, causing it to tend to deflect towards a transmission component, a pulley that rotates about its own axis at the end of the swing arm away from the axis, the rotation axis of the pulley being offset from the swing axis of the swing arm, the pulley biasing towards the transmission component, and a damping assembly, comprising a swingable damping ring with first and second stop surfaces, the damping ring having a damping surface that will frictionally engage with one of the swing arm or the base; the damping assembly also includes a pusher fixed circumferentially to the other of the swing arm or the base, the pusher having a pusher surface corresponding to the stop surface of the damping ring, the pusher surface having first and second pusher surfaces corresponding to the first and second stop surfaces respectively; when the damping ring is relative to the stop surface, the elastic element biases the swing arm towards the transmission component. When the pusher swings around the first direction, the first pushing surface of the pusher and the first stop surface of the damping ring move toward the direction of separation, and the second pushing surface and the second stop surface move toward the direction of approaching each other and abut against each other. The second stop surface applies a force to the second pushing surface, hindering the damping from swinging around the first direction. This allows the damping surface of the damping ring to apply damping to one of the swing arms or the base through friction, increasing the damping between the swing arm and the base when the damping swings around the first direction. When the damping ring swings around the second direction relative to the pusher, the second pushing surface of the pusher and the second stop surface of the damping ring move toward the direction of separation, and the first pushing surface and the first stop surface move toward the direction of approaching each other. The first stop surface applies a force to the first pushing surface, hindering the damping from swinging around the second direction. This allows the damping surface of the damping ring to apply damping to one of the swing arms or the base through friction, increasing the damping between the swing arm and the base when the damping swings around the second direction.

[0008] The beneficial effects of this invention are that, in the loading and unloading directions, damping can be generated in both directions through the action of the damping ring and the pushing component, and the damping can be adjusted in different directions by adjusting the size and angle of the pushing surface and the stop surface. Attached Figure Description

[0009] Figure 1 This is an exploded view of the tensioner wheel with bidirectional damping in this design.

[0010] Figure 2 This is a cross-sectional schematic diagram of the tensioner wheel with bidirectional damping for this invention.

[0011] Figure 3 for Figure 2 A magnified view of a portion of the image. Detailed Implementation

[0012] The following is in conjunction with the appendix Figures 1-3The bidirectional damping tensioner of the present application is clearly and completely described.

[0013] A bidirectional damping tensioner for biasing a drive member (not shown) in a drive system, and providing bidirectional damping, the drive member typically being a drive belt or chain.

[0014] The bidirectional damping tensioner of the present application is described in the form of a typical accessory tensioner, but the form of the typical accessory tensioner is not a limitation of the present application, and the bidirectional damping of the present application can also be fitted to other forms of tensioner, such as tensioners using hydraulic rods, gas strut rods and the like. The bidirectional damping tensioner comprises a base 1 fixed relative to the mounting surface of the tensioner, a swing arm 2 cooperating with the base 1 and being swingable about an axis, an elastic member 3 being provided between the base 1 and the swing arm 2, the elastic member 3 biasing the swing arm 2 so that it has a tendency to deflect towards the drive member, the elastic member 3 being preferably a helical torsion spring, and in other embodiments can be an elastic member of other structural forms which can bias the swing arm 2. The swing arm 2 is provided at an end away from the axis with a pulley 4 which is rotatable about its own axis, the axis of rotation of the pulley 4 being offset from the swing axis of the swing arm 2, the pulley 4 being biased towards the drive member.

[0015] The bidirectional damping tensioner further comprises a damping assembly, the damping assembly comprising a swingable damping ring 52 provided with first and second stop surfaces 521, 522, the damping ring 52 being provided with a damping surface 523 which is in frictional cooperation with the swing arm 2, in Figure 3 In the shown embodiment, it can be seen that the damping surface 523 is in frictional cooperation with the inner surface of the swing arm 2. Preferably, with reference to Figure 1 , the damping ring 52 is C-shaped, the damping surface 523 of the damping ring 52 being the radially outer surface thereof, the swing arm 2 being provided with a friction surface 21 cooperating with the damping surface 523. The damping ring 52 in the relaxed state has a diameter greater than the inner diameter of the friction surface, the damping ring 52 being fitted to the friction surface in a pre-contracted manner.

[0016] The damping assembly further comprises a pushing piece 51 fixed to the base 1 in the circumferential direction, and preferably, the pushing piece 51 is integrally arranged on the base 1. Alternatively, the pushing piece 51 is separately arranged on the base 1, and the pushing piece 51 and the base 1 are respectively provided with positioning holes and positioning columns, which cooperate to position the pushing piece 51 relative to the base 1 in the circumferential direction. The pushing piece 51 is provided with pushing surfaces 511, 512 corresponding to the stop surfaces 521, 522 of the damping ring 52, and the pushing surfaces 511, 512 are respectively provided with first and second pushing surfaces 511, 512 corresponding to the first and second stop surfaces 521, 522. In the preferred embodiment, the stop surfaces and the pushing surfaces are inclined surfaces or circular arc surfaces at a certain angle with respect to the tangent line, and the mutual abutment between the stop surfaces and the pushing surfaces allows the damping ring to expand or contract in the radial direction or have a tendency to expand or contract.

[0017] When the swing arm 2 drives the damping ring 52 to swing relative to the pushing piece 51 in a first direction, which is counterclockwise in the illustrated embodiment, the first pushing surface 511 of the pushing piece 51 and the first stop surface 521 of the damping ring 52 move away from each other, and the second pushing surface 512 and the second stop surface 522 move towards each other and abut, and the second pushing surface 512 exerts a force on the second stop surface 522 to hinder the damping ring 52 from swinging in the first direction, while the force allows the damping ring 52 to expand or have a tendency to expand, further increasing the pressure between the damping ring 52 and the swing arm 2, and then the damping surface 523 of the damping ring 52 exerts a damping force on the swing arm 2 through friction to increase the damping between the swing arm 2 and the base 1 when the swing arm 2 swings in the first direction.

[0018] On the contrary, when the swing arm 2 drives the damping ring 52 to swing relative to the pushing piece 51 in a second direction, Figure 3 which is clockwise in the illustrated embodiment, the second pushing surface 512 of the pushing piece 51 and the second stop surface 522 of the damping ring 52 move away from each other, and the first pushing surface 511 and the first stop surface 521 move towards each other and abut, and the first pushing surface 511 exerts a force on the first stop surface 521 to hinder the damping ring 52 from swinging in the second direction, while the force allows the damping ring 52 to expand or have a tendency to expand, further increasing the pressure between the damping ring 52 and the swing arm 2, and then the damping surface 523 of the damping ring 52 exerts a damping force on the swing arm 2 through friction to increase the damping between the swing arm 2 and the base 1 when the swing arm 2 swings in the second direction. Alternatively, the first pushing surface and the second pushing surface, and the first stop surface 521 and the second stop surface 522 are respectively provided with circular arc connecting portions.

[0019] In Figure 3In the embodiment shown, the damping ring 52 exerts a damping force on the swing arm 2 through the damping surface 523, thereby changing the damping between the swing arm 2 and the base 1 when the damping ring 52 swings in the first direction. In other embodiments, the damping ring and the base can change the damping by changing the cooperation between the damping ring, the pushing member, the swing arm, and the base through friction between them. In alternative embodiments, the damping ring and the fixed base can be combined in relative motion. The specific combination is selected based on the structure and performance requirements of the product. For example, the pushing member and the swing arm are fixed to each other, and the pushing member and the base can slide relative to each other. When the swing arm swings, the pushing member drives the damping ring and the base to generate friction through the pushing surface and the stop surface.

[0020] In the embodiment shown, the friction surface of the damping ring is on the radially outer side. In other alternative embodiments, the damping ring 52 is C-shaped, and the damping surface of the damping ring 52 is the radially inner side surface, i.e., the pushing surface and the stop surface are on the outer side of the damping surface. One of the swing arm 2 or the base 1 is provided with a friction surface that cooperates with the damping surface.

[0021] Figure 3 In the embodiment shown, the diameter of the damping ring 52 in the relaxed state is smaller than the inner diameter of the friction surface, and the damping ring 52 is pre-contracted to fit onto the friction surface.

[0022] Preferably, the number of the first and second pushing surfaces 511, 512 and the first and second stop surfaces 521, 522 is greater than 3 respectively. When the number of pushing surfaces and stop surfaces is large, the radial force exerted on the damping ring is more uniform.

[0023] Alternatively, the damping ring 52 has a multi-layer structure, including the stop surfaces 521, 522 on one radial side, the damping surface on the other radial side, and an elastic layer disposed between the stop surfaces 521, 522 and the damping surface. Preferably, the elastic layer is a strip-shaped metal sheet. The damping ring can better contact the swing arm in the embodiment shown, i.e., the friction member. In other embodiments, the stop surfaces 521, 522 on one radial side and the damping surface on the other radial side of the damping ring 52 are integrally provided. For example, they can be integrally formed by injection molding.

[0024] Alternatively, a damping block 6 is additionally provided between the swing arm 2 and the base 1, and the damping block generates damping by friction with the swing arm 2 or the base 1 when the swing arm 2 swings. This design is a conventional design in the industry and can serve as an effective supplemental damping for the present invention.

[0025] In the illustrated embodiment, the damping surface and the friction surface are arranged on the circumferential surface on the inner and outer sides in the radial direction. In other embodiments (not shown), the damping surface of the damping ring can also be arranged on the axial end surface, and one of the swing arm 2 or the base 1 is provided with a friction surface arranged on the axial end surface and matched with the damping surface.

[0026] In different embodiments, the angle of the central angle corresponding to the first and second abutting surfaces can be different, and correspondingly, the angle of the central angle corresponding to the first and second stop surfaces 521, 522 can be different. Specifically, the central angle of the first abutting surface and the first stop surface can be greater than, equal to, or less than the central angle of the second abutting surface and the second stop surface, so as to adjust the damping value of the tensioner in different directions.

[0027] The first and second abutting surfaces and the first and second stop surfaces 521, 522 respectively form an included angle with the tangent of the corresponding diameter. The included angle corresponding to the first and second abutting surfaces is different in value, and the included angle corresponding to the first and second stop surfaces 521, 522 is different in value. The arc-shaped connecting portion ensures that there is no obstruction during the relative rotation of the damping ring and the abutting member, and at the same time, the size of the abutting surface and the stop surface can be adjusted by adjusting the circumferential length of the arc-shaped connecting portion, and the inclination angle of the included angle can be adjusted to achieve different damping effects in different directions.

[0028] The above technical solutions are only for the description of the embodiments of the present application, and are not a limitation of the present application. Any equivalent changes made by those skilled in the art based on the present application shall fall within the scope of protection of the present application.

Claims

1. A tensioner with bidirectional damping, used for biasing a transmission member in a transmission system and providing bidirectional damping, comprising a base fixed relative to a tensioner mounting surface, a swing arm cooperating with the base and swingable about an axis, a resilient member provided between the base and the swing arm, the resilient member biasing the swing arm to have a tendency to deflect towards the transmission member, a pulley rotatable about its own axis is provided at an end of the swing arm away from the axis, the rotation axis of the pulley is offset from the swing axis of the swing arm, the pulley is biased to the transmission member, characterized in that a damping assembly is further included, the damping assembly comprises a swingable damping ring provided with first and second stop faces, the damping ring is provided with a damping face, the damping face is configured to frictionally cooperate with one of the swing arm or the base; the damping assembly further comprises a push member circumferentially fixed to the other one of the swing arm or the base, the push member is provided with push faces corresponding to the stop faces of the damping ring, the push faces are respectively provided with first and second push faces corresponding to the first and second stop faces; When the damping ring swings relative to the abutting piece around the first direction, the first abutting surface of the abutting piece and the first stop surface of the damping ring move in a direction away from each other, and the second abutting surface and the second stop surface move in a direction close to each other and the push faces of the push member are configured to abut against the stop faces of the damping ring when the damping ring swings relative to the push member about a first direction, , the second abutting surface exerts a force on the second stop surface, hinders the damping ring from swinging around the first direction, and further realizes that the damping surface of the damping ring exerts damping on one of the swing arm or the base through friction, and increases the damping between the swing arm and the base when the damping ring swings around the first direction. when the damping ring swings relative to the push member about a second direction, the second push face of the push member and the second stop face of the damping ring move towards each other in a direction of mutual separation, and the first push face and the first stop face move towards each other in a direction of mutual approach and abut, the first push face exerts a force on the first stop face, hindering the swing of the damping ring about the second direction, and thereby realizing that the damping face of the damping ring exerts damping on one of the swing arm or the base through friction, increasing the damping between the swing arm and the base when the damping ring swings about the second direction.

2. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The resilient member provided between the base and the swing arm can be a helical torsion spring or a belt spring.

3. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The damping ring is C-shaped, the damping face of the damping ring is a radially outer side surface thereof, one of the swing arm or the base is provided with a friction face cooperating with the damping face.

4. The tensioner with bidirectional damping of claim 3, wherein: The diameter of the damping ring in a relaxed state is greater than the inner diameter of the friction face, the damping ring is pre-contracted and fitted onto the friction face.

5. The tensioning pulley with bidirectional damping according to claim 4, characterized in that: When the damping ring swings relative to the push member about a first direction, the second push face and the second stop face abut, the push member pushes the damping ring to generate a tendency of clockwise rotation or clockwise rotation.

6. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The damping ring is C-shaped, the damping face of the damping ring is a radially inner side surface thereof, one of the swing arm or the base is provided with a friction face cooperating with the damping face.

7. The tensioning pulley with bidirectional damping according to claim 6, characterized in that: In a relaxed state, the diameter of the damping ring is less than the inner diameter of the friction face, the damping ring is pre-contracted and fitted onto the friction face.

8. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The number of the first and second push faces and the first and second stop faces is greater than 3 respectively.

9. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The damping ring has a multi-layer structure, comprising a stop face on one radial side, a damping face on the other radial side, and an elastic layer provided between the stop face and the damping face.

10. The tensioning pulley with bidirectional damping according to claim 9, characterized in that: The elastic layer is a belt-shaped metal sheet.

11. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: The stop face on one radial side of the damping ring and the damping face on the other radial side are integrally provided.

12. The tensioning pulley with bidirectional damping according to claim 1, characterized in that: A damping block is further provided between the swing arm and the base, the damping block generates damping by friction with the swing arm or the base as the swing arm swings.

13. The tensioning pulley with bidirectional damping of claim 1, wherein: The push member is integrally provided with the other one of the swing arm or the base.

14. The tensioning pulley with bidirectional damping of claim 1, wherein: The pushing piece is separately arranged relative to the other one of the swing arm or the base, and the pushing piece and the other one of the swing arm or the base are respectively provided with a positioning hole and a positioning column, and the two are matched to realize the circumferential positioning of the pushing piece relative to the other one of the swing arm or the base.

15. The tensioning pulley with bidirectional damping of claim 1, wherein: The damping surface of the damping ring is an axial end side surface, and one of the swing arm or the base is provided with a friction surface arranged at the axial end side and matched with the damping surface.

16. The tensioning pulley with bidirectional damping of claim 1, wherein: The first pushing surface and the second pushing surface and the first stopping surface and the second stopping surface are respectively provided with a circular arc connecting part.

17. The tensioning pulley with bidirectional damping of claim 1, wherein: The central angles corresponding to the first pushing surface and the second pushing surface are different in size, and the central angles corresponding to the first stopping surface and the second stopping surface are different in size.

18. The tensioning pulley with bidirectional damping of claim 1, wherein: The first pushing surface and the second pushing surface and the first stopping surface and the second stopping surface respectively form an included angle with a tangent line of the corresponding diameter.

19. The tensioning pulley with bidirectional damping according to claim 18, characterized in that: The included angles corresponding to the first pushing surface and the second pushing surface are different in value, and the included angles corresponding to the first stopping surface and the second stopping surface are different in value.

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