Belt tensioning wheel with two-direction double-damping structure

Abstract

The utility model discloses a belt tensioning wheel with a two-direction double-damping structure, and aims to solve the problems that a swing arm of the tensioning wheel swings excessively and transmission is unstable due to sudden change of belt tension under the transient working condition of a high-power engine. The tensioning wheel comprises a connecting cover and a swing arm which are hinged, one end of the swing arm is provided with a belt wheel, and the other end is provided with an annular mounting groove. A torsional spring and a damping sleeve are arranged between the connecting cover and the mounting groove to form first-direction circumferential damping. The other end face of the swing arm is provided with a spring groove in which a belleville spring is arranged; the end part of the connecting cover is connected with a screw cover, and the inner wall of the screw cover is adhered with a damping plate which is contacted with the belleville spring to form second-direction circumferential damping. Through bidirectional damping and matching of the limiting blocks on the peripheral wall of the connecting cover and the limiting grooves of the mounting groove, abnormal swing of the swing arm is effectively restrained, the transmission stability when power of an engine changes instantly is ensured, and transient power cut-off is avoided.

Description

Technical Field

[0001] This utility model relates to the field of engine transmission system technology, and in particular to a tensioning pulley for tensioning engine belts, specifically a belt tensioning pulley with a dual-direction double-damping structure. Background Technology

[0002] The tensioner pulley is a key component in the engine belt drive system. Its main function is to maintain the appropriate tension of the belt to ensure efficient and reliable power transmission.

[0003] Especially in vehicles equipped with high-power engines, which have ample power reserves, the belt will be subjected to a huge kinetic energy impact during sudden acceleration or deceleration, causing a sharp change in its tension. This impact can easily cause the tensioner's swing arm to swing violently and unstablely, leading to belt slippage, tooth skipping, and other phenomena, which greatly affects transmission efficiency. In severe cases, it can even cause a brief interruption of power transmission, affecting driving smoothness and engine performance.

[0004] Therefore, effectively suppressing the abnormal swaying of the swing arm under dynamic impact is the key to improving the stability and reliability of the tensioner. Utility Model Content

[0005] This utility model aims to overcome the shortcomings of the prior art and provide a two-way double-damping belt tensioner to solve the technical problem that the tensioner swing arm swings too much, the transmission is unstable, or even the power is cut off briefly due to sudden changes in belt tension under transient conditions of high-power engines.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dual-direction double-damping belt tensioner, comprising a swing arm, a connecting cover, a pulley, a torsion spring, a damping sleeve, a disc spring, a screw cap, and a damping plate.

[0007] Specifically, one end of the swing arm is equipped with a pulley for engaging with the engine belt. The connecting cover has an annular insert ring in its center. The other end of the swing arm has an annular mounting groove that mates with the insert ring. The insert ring is inserted into the central hole of the annular mounting groove, thereby hinged the connecting cover to the swing arm, allowing the swing arm to swing within a certain angle range around the insert ring axis.

[0008] A torsion spring is provided between the connecting cover and the annular mounting groove. This torsion spring provides a continuous reset preload to the swing arm, ensuring that it always presses the pulley firmly against the belt.

[0009] To prevent the torsion spring from spinning freely or twisting excessively when under stress, a damping sleeve is fixedly fitted onto the outer wall of the central hole of the annular mounting groove. When the torsion spring twists due to the swing arm, its inner diameter will decrease accordingly, thereby making close contact with the outer wall of the damping sleeve and generating frictional resistance. This forms circumferential damping in the first direction of the swing arm's swing, mainly suppressing the rapid rebound or forward swing of the swing arm.

[0010] Furthermore, on the other end face of the swing arm away from the annular mounting groove, i.e., the end face opposite to the connecting cover, an annular spring groove is provided. An axially compressible disc spring is installed in this spring groove. A screw cap is connected to the insertion ring end of the connecting cover; in this embodiment, the screw cap is preferably fixed to the insertion ring end by riveting. A damping plate is adhered to the inner wall of the screw cap (i.e., the inner wall of the opening facing the swing arm).

[0011] When the swing arm swings, the disc spring on it comes into contact with and is compressed against the damping plate on the screw cap. Due to the nonlinear stiffness characteristics of the disc spring, it generates a reaction force to resist deformation when subjected to axial pressure. This force is converted into resistance through friction with the damping plate, thus forming circumferential damping in the second direction of the swing arm's swing, mainly suppressing the forward swing or excessive deflection of the swing arm when it is impacted.

[0012] Through the dual damping action in the first and second directions, the tensioner of this invention can absorb and dissipate the kinetic energy generated by the swing arm under transient impact in all directions, ensuring the smoothness of its swing. In addition, it includes mounting bolts, which are inserted into the central hole of the connecting cover, allowing the entire tensioner assembly to be securely mounted and fixed to the engine block.

[0013] As a preferred limiting structure, a limiting groove is provided at the opening end of the annular mounting groove, and correspondingly, a limiting block is protruding on the peripheral wall of the connecting cover. When the swing arm swings to its limit position, the limiting block will engage with the limiting groove, thereby physically limiting the maximum swing amplitude of the swing arm, preventing structural damage or failure due to excessive swing, and further ensuring the stability of the swing arm.

[0014] Compared with the prior art, the present invention has the following significant advantages:

[0015] 1. Dual-directional damping for high stability: This utility model innovatively adopts a dual-damping structure design of "torsion spring-damping sleeve" and "butterfly spring-damping plate". The first-direction damping mainly deals with the rapid rebound of the swing arm, while the second-direction damping focuses on suppressing the impact swing of the swing arm. The two work together to limit the abnormal movement of the swing arm from two dimensions, greatly improving the operating stability of the tensioner wheel under complex working conditions.

[0016] 2. Rapid response and excellent suppression effect: The disc spring has the characteristics of high axial stiffness and sensitive response, which can quickly react to the impact of the swing arm and provide strong reverse resistance. Combined with the linear preload and damping effect of the torsion spring, the suppression effect of this invention on the instantaneous change of belt tension is far superior to the traditional single spring or hydraulic damping structure, which can effectively prevent belt slippage and tooth skipping.

[0017] 3. Continuous transmission and high reliability: Through the combined action of dual damping and limiting structure, the swing amplitude of the swing arm can be controlled within a safe range even under extreme conditions such as sudden acceleration and deceleration of the engine. This avoids brief interruptions in power transmission, ensures the continuity and smoothness of engine power output, and improves the overall driving experience and engine lifespan.

[0018] 4. Simple structure and easy to manufacture: The connection relationship of each component of this utility model is clear. It is mainly assembled by mechanical snap-fit, sleeve and riveting. The overall structure is compact and the number of parts is moderate, which facilitates mass production and later maintenance.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a perspective view of a specific embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0022] Figure 3 This is a perspective view of the swing arm in a specific embodiment of the present utility model;

[0023] Figure 4 This is a perspective view of the connecting cover in a specific embodiment of the present utility model.

[0024] Explanation of reference numerals in the attached drawings: 1-Connecting cover; 11-Insertion ring; 12-Limiting block; 2-Pulley; 3-Swing arm; 31-Annular mounting groove; 32-Spring groove; 33-Limiting groove; 4-Torsion spring; 41-Damping sleeve; 5-Screw cap; 51-Damping plate; 6-Butterfly spring; 7-Mounting bolt. Detailed Implementation

[0025] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] like Figure 1 — Figure 4 As shown in the figure, this embodiment discloses a two-direction dual-damping belt tensioner.

[0027] Its core structure includes a connecting cover 1 as a base, which is generally disc-shaped and has an annular insert ring 11 integrally formed or machined at its center. A radially extending limiting block 12 is also provided on the circumferential sidewall of the connecting cover 1.

[0028] A long, narrow swing arm 3 forms the main moving part of the tensioner. A pulley 2 for contacting the belt is fixedly mounted at one end of the swing arm 3. At the other end of the swing arm 3, opposite to the pulley 2, an annular mounting groove 31 is machined, the shape of its central hole matching the insertion ring 11 of the connecting cover 1. During assembly, the insertion ring 11 of the connecting cover 1 is inserted into the central hole of the annular mounting groove 31 of the swing arm 3, achieving a hinged connection. A limiting groove 33 is formed circumferentially at the open end of the annular mounting groove 31. After the connecting cover 1 and the swing arm 3 are assembled, the limiting block 12 on the peripheral wall of the connecting cover 1 is precisely located within this limiting groove 33, thereby limiting the maximum swing angle of the swing arm 3 relative to the connecting cover 1.

[0029] To achieve pre-tensioning and damping in the first direction, a torsion spring 4 is installed between the inner wall of the annular mounting groove 31 connecting the cover 1 and the swing arm 3. Simultaneously, a damping sleeve 41 is tightly fitted onto the outer wall of the central hole of the annular mounting groove 31. In the unloaded state, the inner diameter of the torsion spring 4 is larger than the outer diameter of the damping sleeve 41. When the swing arm 3 swings outward due to belt slack, it causes the inner wall of the annular mounting groove 31 to twist the torsion spring 4, causing the torsion spring 4 to deform and its inner diameter to shrink until it tightly grips the outer wall of the damping sleeve 41. Utilizing the significant friction between the two, a strong circumferential damping in the first direction is formed, preventing the swing arm 3 from rapidly rebounding.

[0030] To achieve damping in the second direction, a spring groove 32 is machined on the end face of the swing arm 3 away from the annular mounting groove 31. One or more butterfly springs 6 connected in series or parallel are installed in this spring groove 32. The butterfly springs 6 mainly function as axial elastic elements here.

[0031] A screw cap 5 is riveted to the end of the insert ring 11 of the connecting cover 1 using a cold forging or hot riveting process. The shape of the screw cap 5 conforms to the end profile of the insert ring 11. On the inner wall surface of the screw cap 5 facing the swing arm 3, a damping plate 51 is bonded with a high-strength adhesive. This damping plate 51 is preferably made of wear-resistant, high-friction coefficient engineering plastic or rubber composite material. When the swing arm 3 swings inward due to the impact of belt tension, the disc spring 6 on it will first contact the screw cap 5. Subsequently, as the swing arm 3 continues to swing, the disc spring 6 is axially compressed, generating a huge elastic force to resist deformation. This elastic force drives the outer edge of the disc spring 6 to fit tightly against the damping plate 51. The sliding friction generated between the two forms a second-direction circumferential damping, effectively buffering and absorbing the impact energy.

[0032] Finally, a mounting bolt 7 passes through the reserved through hole in the center of the connecting cover 1 (i.e., the middle hole of the insert ring 11) to fix the entire tensioning wheel assembly onto the preset bracket of the engine block.

[0033] In summary, this utility model uses two sets of damping mechanisms with different principles to precisely control the swing of the swing arm from two dimensions. With the addition of a mechanical limiting structure, a stable and reliable belt tensioning system is formed, which perfectly solves the problem of belt drive instability under transient conditions of high-power engines.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-direction, dual-damping belt tensioner, characterized in that, include: A swing arm (3) has a pulley (2) installed at one end; Connecting cover (1), with an annular insert ring (11) in the middle; The other end of the swing arm (3) is provided with an annular mounting groove (31) that cooperates with the insert ring (11), and the insert ring (11) is inserted into the central hole of the annular mounting groove (31); A torsion spring (4) for providing preload is provided between the connecting cover (1) and the annular mounting groove (31). A damping sleeve (41) is sleeved on the outer wall of the central hole of the annular mounting groove (31). After the torsion spring (4) is twisted, its inner diameter shrinks and it contacts the outer wall of the damping sleeve (41) to form circumferential damping in the first direction. The other end face of the swing arm (3) away from the annular mounting groove (31) is provided with an annular spring groove (32), and an axially compressible disc spring (6) is installed in the spring groove (32). The end of the insertion ring (11) of the connecting cover (1) is connected to a screw cap (5), and a damping plate (51) is bonded to the inner wall of the screw cap (5). The damping plate (51) contacts the disc spring (6) to form circumferential damping in the second direction.

2. The dual-direction dual-damping belt tensioner according to claim 1, characterized in that, It also includes mounting bolts (7), which are inserted into the central hole of the connecting cover (1) to fix the belt tensioner to the engine.

3. The dual-direction dual-damping belt tensioner according to claim 1, characterized in that, The opening end of the annular mounting groove (31) is provided with a limiting groove (33), and a limiting block (12) is protruding on the peripheral wall of the connecting cover (1). The limiting block (12) is placed in the limiting groove (33) to limit the swing amplitude of the swing arm (3).

4. The dual-direction dual-damping belt tensioner according to claim 1, characterized in that, The screw cap (5) is fixed to the end of the insert ring (11) by riveting.

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