Tensioning wheel with bidirectional damping

Abstract

The tensioning wheel comprises a fixed base and a swing arm which is matched with the base and can swing around the axis, an elastic piece for pressing the swing arm in a bias mode is arranged between the base and the swing arm so that the swing arm can tend to deflect towards a transmission piece, and a belt wheel rotating around the axis of the belt wheel is arranged at the 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 invention relates to a tensioning wheel with bidirectional damping. Background Art

[0002] Most internal combustion engines used in automobiles and the like include belt-driven accessory systems that are necessary for the proper operation of the vehicle. The accessory systems may include, for example, an alternator, an air conditioning compressor, and a power steering pump.

[0003] The accessory system is usually installed at the front end of the engine. Each accessory has a pulley mounted on a shaft for receiving power from a belt drive. In order to operate correctly, the belt is installed with a predetermined tension. When the engine is running, the belt is slightly stretched as a whole or partially under great force, exceeding its preset length, which will cause the belt tension to drop and may cause the belt to slip. Therefore, when the belt stretches during use, a belt tensioner is used to maintain the proper belt tension.

[0004] When the belt tensioner is running, the running belt may excite vibrations in the spring of the tensioner. These vibrations are undesirable because they cause wear of the belt and tensioner and vibration and noise of the system. During operation, the swing arm will swing around the swing axis. This vibration may occur when the swing arm swings in both directions.

[0005] A tensioning wheel with bidirectional damping is needed to damp the vibration of the tensioning wheel during operation. Summary of the invention

[0006] The technical problem to be solved by the invention is to provide a tensioning wheel with bidirectional damping.

[0007] In order to solve the above technical problems, the present invention provides a tensioning wheel with bidirectional damping, which includes a fixed base, a swing arm that cooperates with the base and can swing around an axis, an elastic member that biases the swing arm is arranged between the base and the swing arm, so that it has a tendency to deflect toward a transmission member, and a pulley that rotates around its own axis is arranged at one end of the swing arm away from the axis, and the rotation axis of the pulley deviates from the swing axis of the swing arm. The pulley is biased to the transmission member and also includes a damping assembly, the damping assembly includes a swingable damping ring provided with a first and a second stop surface, the damping ring is provided with a damping surface, and the damping surface will frictionally cooperate with one of the swing arm or the base; the damping assembly also includes a thrust piece fixed to another circumference of the swing arm or the base, the thrust piece is provided with a thrust surface corresponding to the stop surface of the damping ring, and the thrust surface is respectively provided with first and second thrust surfaces corresponding to the first and second stop surfaces; when the damping ring is relative to the thrust piece When the push member swings around a first direction, the first push surface of the push member and the first stop surface of the damping ring move in a direction of separation, and the second push surface and the second stop surface move in a direction approaching each other and abut against each other, and the second stop surface applies a force to the second push surface to prevent the damping from swinging around the first direction, thereby achieving the damping surface of the damping ring to apply damping to one of the swing arm or the base through friction, thereby increasing the damping between the swing arm and the base when the damping swings around the first direction; when the damping ring swings around a second direction relative to the push member, the second push surface of the push member and the second stop surface of the damping ring move in a direction of separation, and the first push surface and the first stop surface move in a direction approaching each other, and the first stop surface applies a force to the first push surface to prevent the damping from swinging around the second direction, thereby achieving the damping surface of the damping ring to apply damping to one of the swing arm or the base through friction, thereby increasing the damping between the swing arm and the base when the damping swings around the second direction.

[0008] The beneficial effect of the invention is that in the loading and unloading directions, damping can be generated in both directions through the action of the damping ring and the thrust member, and the damping can be adjusted in different directions by adjusting the size and angle of the thrust surface and the stop surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the decomposed tensioner with bidirectional damping created for this purpose.

[0010] Figure 2 This is a schematic cross-sectional view of the tensioner with bidirectional damping.

[0011] Figure 3 for Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0012] The following is combined with Figure 1-3A clear and complete description is given of the bidirectional damping tensioning wheel of the invention.

[0013] A tensioning wheel with bidirectional damping is used for biasing a transmission member (not shown) in a transmission system and providing bidirectional damping. The transmission member is typically a transmission belt or a chain.

[0014] With reference to the accompanying drawings, the bidirectional damping tensioning wheel of the present invention is described with the appearance of a typical accessory tensioning wheel, but the appearance of the typical accessory tensioning wheel is not a limitation of the present invention, and the bidirectional damping in the present invention can also be mounted on tensioning wheels of other forms, such as tensioning wheels with structures such as hydraulic rods and gas struts. The bidirectional damping tensioning wheel comprises a base 1 fixed relative to the tensioning wheel mounting surface, a swing arm 2 that cooperates with the base 1 and can swing around an axis, and an elastic member 3 is arranged between the base 1 and the swing arm 2. The elastic member 3 biases the swing arm 2 so that it has a tendency to deflect toward the transmission member. The elastic member 3 is preferably a helical torsion spring. In other embodiments, it can also be an elastic member with a spring or other structural form that can bias the swing arm 2. A pulley 4 that rotates around its own axis is arranged at one end of the swing arm 2 away from the axis. The rotation axis of the pulley 4 deviates from the swing axis of the swing arm 2, and the pulley 4 is biased to the transmission member.

[0015] The bidirectional damping tension wheel also includes a damping assembly, which includes a swingable damping ring 52 provided with a first stop surface 521 and a second stop surface 522. The damping ring 52 is provided with a damping surface 523, and the damping surface 523 will frictionally cooperate with the swing arm 2. Figure 3 In the embodiment shown, it can be seen that the damping surface 523 and the inner surface of the swing arm 2 rub against each other. Figure 1 The damping ring 52 is C-shaped, and the damping surface 523 of the damping ring 52 is its radial outer surface. The swing arm 2 is provided with a friction surface 21 that matches the damping surface 523. The diameter of the damping ring 52 in a relaxed state is greater than the inner diameter of the friction surface, and the damping ring 52 is pre-contracted to fit onto the friction surface.

[0016] The damping assembly also includes a push member 51 fixed to the base 1 in the circumferential direction. Preferably, the push member 51 is integrated with the base 1. Optionally, the push member is separately arranged relative to the base 1, and the push member and the base 1 are respectively provided with positioning holes and positioning columns, and the two cooperate to achieve the circumferential positioning of the push member relative to the base 1. The push member 51 is provided with push surfaces 511 and 512 corresponding to the stop surfaces 521 and 522 of the damping ring 52, and the push surfaces are respectively provided with first and second push surfaces 511 and 512 corresponding to the first and second stop surfaces 521 and 522. In a preferred embodiment, the stop surface and the push surface are inclined surfaces or arc-shaped surfaces that form a certain angle with the tangent line, and the mutual abutment between the stop surface and the push surface can make the damping ring expand or contract radially, or have a tendency to expand or contract.

[0017] When the swing arm 2 drives the damping ring 52 to swing around a first direction relative to the thrust member 51, in the illustrated embodiment, the first direction is counterclockwise, the first thrust surface 511 of the thrust member 51 and the first stop surface 521 of the damping ring 52 move in directions away from each other, and the second thrust surface 512 and the second stop surface 522 move in directions approaching each other and abut against each other, the second thrust surface 512 applies a force to the second stop surface 522 to prevent the damping ring 52 from swinging around the first direction, and at the same time, the force causes the damping ring 52 to expand outward or have a tendency to expand outward, further increasing the pressure between the damping ring 52 and the swing arm 2, thereby achieving the damping surface 523 of the damping ring 52 applying damping to the swing arm 2 through friction, thereby increasing the damping between the swing arm 2 and the base 1 when the swing arm 2 swings around the first direction.

[0018] In contrast, when the swing arm 2 drives the damping ring 52 to swing relative to the push member 51 in the second direction, Figure 3 In the illustrated embodiment, the second direction is clockwise, the second push surface 512 of the push member 51 and the second stop surface 522 of the damping ring 52 move in a direction away from each other, and the first push surface 511 and the first stop surface 521 move in a direction close to each other and abut against each other, the first push surface 511 applies a force to the first stop surface 521 to prevent the damping ring 52 from swinging around the second direction, and at the same time, the force causes the damping ring 52 to expand outward or have a tendency to expand outward, further increasing the pressure between the damping ring 52 and the swing arm 2, thereby achieving the damping surface 523 of the damping ring 52 to apply a damping force to the swing arm 2 through friction, increasing the damping between the swing arm 2 and the base 1 when the damping ring 52 of the swing arm 2 swings around the second direction. Optionally, arc-shaped connecting portions are respectively provided between the first push surface and the second push surface, and between the first stop surface 521 and the second stop surface 522.

[0019] exist Figure 3In the embodiment, the damping ring 52 applies a damping force to 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 around the first direction. In other embodiments, by changing the matching relationship between the damping ring, the push piece, the swing arm, and the base, the damping can also be changed by the friction between the damping ring and the base. In an optional embodiment, the damping ring can also be in contact with the fixed base in relative motion, and the push piece can be fixedly combined with the swing arm. The specific combination method is selected based on the structure and performance requirements of the product. For example, the push piece and the swing arm are fixed to each other, and the push piece and the base can produce relative sliding. When the swing arm swings, the push piece drives the damping ring and the base to produce friction through the action of the push surface and the stop surface.

[0020] In the illustrated embodiment, the friction surface of the damping ring is on the radial outside. In other optional embodiments, the damping ring 52 is C-shaped, and the damping surface of the damping ring 52 is its radial inner surface, that is, the thrust surface and the stop surface are on the outside of the damping surface, and one of the swing arm 2 or the base 1 is provided with a friction surface matching the damping surface.

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

[0022] Preferably, the number of the first and second thrust surfaces 511, 512 and the first and second stop surfaces 521, 522 is respectively greater than 3. When the number of thrust surfaces and stop surfaces is large, the radial force applied to the damping ring can be more uniform.

[0023] Optionally, the damping ring 52 is a multi-layer structure, including stop surfaces 521, 522 on one radial side, a damping surface on the other radial side, and an elastic layer arranged between the stop surfaces 521, 522 and the damping surface. Preferably, the elastic layer is a strip-shaped metal sheet. Then the damping ring can better contact with the swing arm shown in the figure, that is, the friction member. In other embodiments, the stop surfaces 521, 522 on one radial side of the damping ring 52 and the damping surface on the other radial side are integrally arranged. For example, it can be manufactured by integral molding by injection molding.

[0024] Optionally, 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 as the swing arm 2 swings. This design is a conventional design in the industry and can be used as an effective supplementary damping of the invention.

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

[0026] In different embodiments, the central angles of the first push surface and the second push surface can be selected in different ways, and correspondingly, the central angles of the first stop surface 521 and the second stop surface 522 can be selected in different ways. Specifically, the central angles of the first push surface and the first stop surface can be greater than, equal to, or less than the central angles of the second push surface and the second stop surface, so that the damping value of the tensioner in different directions can be adjusted.

[0027] The first and second thrust surfaces and the first and second stop surfaces 521, 522 respectively form angles with the tangents of their corresponding diameters. The numerical values ​​of the angles corresponding to the first thrust surface and the second thrust surface are different, and the numerical values ​​of the angles corresponding to the first stop surface 521 and the second stop surface 522 are different. The arc-shaped connecting portion ensures that there is no obstruction during the relative rotation of the damping ring and the thrust member. At the same time, the size of the thrust 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 angle can be adjusted to achieve different damping effects in different directions.

[0028] The above technical solution is only an explanation of the implementation example of the present invention, and is not a limitation of the present invention. Any equivalent changes made by those skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. A tensioning wheel with bidirectional damping, used for biasing a transmission member in a transmission system and providing bidirectional damping, comprising The base is fixed relative to the mounting surface of the tensioner. A swing arm that matches the base and can swing around an axis. An elastic member is arranged between the base and the swing arm, and the elastic member biases the swing arm so that it tends to deflect toward the transmission member. The end of the swing arm away from the axis is provided with a pulley rotating around its own axis, the rotation axis of the pulley is deviated from the swing axis of the swing arm, and the pulley is biased to the transmission member. It is characterized in that Also included is a damping assembly, the damping assembly including a swingable damping ring provided with first and second stop surfaces, the damping ring being provided with a damping surface, the damping surface being frictionally engaged with one of the swing arm or the base; The damping assembly also includes a push piece fixed to the swing arm or another circumferential part of the base, the push piece is provided with a push surface corresponding to the stop surface of the damping ring, and the push surface is respectively provided with first and second push surfaces corresponding to the first and second stop surfaces; When the damping ring swings relative to the push member about the first direction, the first push surface of the push member and the first stop surface of the damping ring move in a direction away from each other, and the second push surface and the second stop surface move in a direction approaching each other. and Butt The second push surface applies a force to the second stop surface to prevent the damping ring from swinging around the first direction, thereby achieving the damping surface of the damping ring applying damping to one of the swing arm or the base through friction, thereby increasing the damping between the swing arm and the base when the damping ring swings around the first direction; When the damping ring swings around the second direction relative to the thrust member, the second thrust surface of the thrust member and the second stop surface of the damping ring move in directions away from each other, and the first thrust surface and the first stop surface move in directions close to each other and abut against each other, and the first thrust surface applies a force to the first stop surface to prevent the damping ring from swinging around the second direction, thereby achieving the damping surface of the damping ring applying damping to one of the swing arm or the base through friction, thereby increasing the damping between the swing arm and the base when the damping ring swings around the second direction.

2. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: An elastic member is arranged between the base and the swing arm and can be a spiral torsion spring or a belt spring.

3. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The damping ring is C-shaped, the damping surface of the damping ring is its radial outer surface, and one of the swing arm or the base is provided with a friction surface matching the damping surface.

4. The tensioning wheel with bidirectional damping according to claim 3, characterized in that: The diameter of the damping ring in a relaxed state is larger than the inner diameter of the friction surface, and the damping ring is pre-shrunk and fitted onto the friction surface.

5. The tensioning wheel with bidirectional damping according to claim 4, characterized in that: When the damping ring swings around the first direction relative to the push member, the second push surface and the second stop surface abut against each other, and the push member pushes the damping ring to rotate clockwise or has a tendency to rotate clockwise.

6. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The damping ring is C-shaped, the damping surface of the damping ring is its radial inner surface, and one of the swing arm or the base is provided with a friction surface matching the damping surface.

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

8. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The number of the first and second pushing surfaces and the number of the first and second stopping surfaces are respectively greater than three.

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

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

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

12. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: A damping block is also arranged 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 wheel with bidirectional damping according to claim 1, characterized in that: The push member is integrally arranged with the other of the swing arm or the base.

14. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The push member is separately arranged relative to the other one of the swing arm or the base, and the push member and the other one of the swing arm or the base are respectively provided with a positioning hole and a positioning column, which cooperate to achieve the circumferential positioning of the push member relative to the other one of the swing arm or the base.

15. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The damping surface of the damping ring is its axial end side surface, and one of the swing arm or the base is provided with a friction surface matched with the damping surface and arranged on the axial end side.

16. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: Arc-shaped connecting parts are respectively arranged between the first pushing surface and the second pushing surface, and between the first stopping surface and the second stopping surface.

17. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The central angles of the first pushing surface and the second pushing surface are different in size, and the central angles of the first stopping surface and the second stopping surface are different in size.

18. The tensioning wheel with bidirectional damping according to claim 1, characterized in that: The first and second thrust surfaces and the first and second stop surfaces respectively form angles with the tangent lines of their corresponding diameters.

19. The tensioning wheel with bidirectional damping according to claim 18, characterized in that: The values ​​of the angles corresponding to the first pushing surface and the second pushing surface are different, and the values ​​of the angles corresponding to the first stopping surface and the second stopping surface are different.

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