Belt tensioning wheel with double-bushing and double-damping structure

Abstract

The utility model discloses a double-bushing double-damping structure belt tensioning wheel, which comprises a connecting cover, a swing arm and a belt wheel, the other end of the swing arm is provided with an annular mounting groove, an insertion ring in the middle of the connecting cover is inserted into the groove (in the annular mounting groove), a torsion spring is arranged in the groove, and a support leg of the torsion spring is hooked on the inner side wall of the connecting cover. A first lining is arranged between the connecting cover and the groove end face, the inserting ring is riveted with a screw cover, and a second lining is arranged between the screw cover and the groove outer bottom face. A first damping structure is arranged between the outer wall of the hole in the groove and the torsion spring; and a second damping structure is arranged between the screw cap and the bottom surface outside the groove. The sections of the first bushing and the second bushing are L-shaped and are respectively positioned through steps and positioning grooves to prevent the swing arm from deflecting leftwards and rightwards. The first damping structure comprises a damping sleeve; the torsional spring is in torsional contact with the damping sleeve; the second damping structure comprises a belleville spring in a spring groove and a damping plate in a screw cap. And a mounting bolt and a limiting block limiting groove are also arranged. The tensioning wheel can effectively restrain deflection and excessive swing of the swing arm, improves transmission stability and is suitable for a high-power engine.

Description

Technical Field

[0001] This utility model relates to the technical field of engine belt drive systems, and in particular to a belt tensioner with a double bushing and double damping structure for tensioning engine belts, especially for high-power engines and engineering machinery engine belts. Background Technology

[0002] The tensioner pulley is mainly used to tension the engine belt, ensuring the engine's power output. For high-power engines with ample power reserves, the belt experiences a huge instantaneous change in kinetic energy during sudden acceleration or deceleration. This can easily cause significant swaying of the tensioner pulley's swing arm, greatly affecting transmission efficiency and even leading to a temporary power cut-off. This is especially true for engines used in construction machinery, which have high power and heavy loads; their tensioner pulleys are prone to lateral swaying during operation, further exacerbating transmission instability.

[0003] Therefore, a tension wheel structure that can effectively suppress excessive swing and yaw of the swing arm is needed. Utility Model Content

[0004] The purpose of this utility model is to overcome the technical defects of existing tension pulleys used in high-power engines and construction machinery, which are prone to excessive swing amplitude of the swing arm due to instantaneous changes in the kinetic energy of the belt, and easy to cause left and right sway, resulting in reduced transmission efficiency or even temporary power cut-off. The utility model provides a belt tension pulley with a double bushing and double damping structure to effectively limit the left and right sway of the swing arm and ensure its stable swing when the belt is subjected to instantaneous changes in force, thereby improving transmission reliability and efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a belt tensioner with a double bushing and double damping structure, comprising a connecting cover, a swing arm, and a pulley. The pulley is installed at one end of the swing arm, and the other end of the swing arm is provided with an annular mounting groove. The connecting cover has an annular insert ring in the middle, which is inserted into the central hole of the annular mounting groove. A torsion spring is built into the annular mounting groove, and the protruding support leg of the torsion spring is hooked onto the inner side wall of the connecting cover. A first bushing is provided between the connecting cover and the end face of the annular mounting groove. After the insert ring of the connecting cover passes through the central hole of the annular mounting groove, a screw cap is riveted to it. A second bushing is provided between the screw cap and the outer bottom surface of the annular mounting groove.

[0006] A first damping structure is provided between the outer wall of the central hole of the annular mounting groove and the torsion spring, and a second damping structure is provided between the screw cap and the outer bottom surface of the annular mounting groove.

[0007] The first bushing and the second bushing both have an "L" shaped cross-section. The inner wall of the opening of the annular mounting groove is provided with an annular step. The outer wall of the first bushing abuts against the step. The opening end face and outer wall edge of the connecting cover abut against the inner wall of the first bushing. The outer wall of the second bushing abuts against the inner wall of the screw cap. The bottom of the annular mounting groove is provided with an annular positioning groove that matches the second bushing. The second bushing covers the annular positioning groove. The first bushing and the second bushing are used to ensure the axial positioning of the swing arm and prevent it from swaying left and right.

[0008] The first damping structure includes a damping sleeve fitted on the outer wall of the central hole of the annular mounting groove. After the torsion spring is twisted, its inner diameter shrinks and contacts the outer wall of the damping sleeve, generating a circumferential damping force.

[0009] The second damping structure includes an annular spring groove on the other end face of the swing arm away from the annular mounting groove. An axially compressible butterfly spring is installed in the spring groove. A damping plate is bonded to the inner cavity of the screw cap, and the damping plate is in contact with the butterfly spring. Specifically, the damping plate is bonded to the inner bottom surface of the second bushing.

[0010] The connecting cover has a central hole into which a mounting bolt is inserted to secure the tensioning wheel to the engine.

[0011] A limiting groove is provided at the opening end of the annular mounting groove, and a limiting block is protruding on the peripheral wall of the connecting cover. The limiting block is placed in the limiting groove to limit the swing amplitude of the swing arm and make the swing of the swing arm more stable.

[0012] The circumferential damping generated between the disc spring and the damping plate, as well as the circumferential damping of the torsion spring and the damping sleeve, ensures the stability of the swing arm swing in both directions, so that the instantaneous change of engine power will not cause the swing arm swing amplitude to be too large, thereby improving the transmission stability.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By setting the first bushing and the second bushing, the axial position of the swing arm is effectively constrained, which significantly improves the left and right sway problem that is prone to occur in traditional tensioning wheels and improves the straightness and stability of the swing arm swing.

[0015] 2. The dual-damping design, which employs a first damping structure (torsion spring and damping sleeve) and a second damping structure (butterfly spring and damping plate), can apply circumferential damping force to the swing arm from two different directions. This effectively suppresses excessive swing of the swing arm when the belt of a high-power engine experiences a sudden change in kinetic energy, thus avoiding the risk of reduced transmission efficiency and temporary power cut-off.

[0016] 3. By setting a limiting block on the peripheral wall of the connecting cover and a limiting groove at the opening end of the annular mounting groove, the maximum swing amplitude of the swing arm is limited, further ensuring the smooth and controllable swing of the swing arm.

[0017] 4. The overall structure is reasonably designed and the connections of each component are reliable, which can effectively improve the reliability and durability of belt drive systems for high-power engines and engines used in construction machinery.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a perspective view of a specific embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0021] Figure 3 This is a partial structural diagram of a specific embodiment of the present utility model.

[0022] Figure descriptions: 1-Connecting cover; 11-Insertion ring; 12-Limiting block; 2-Swing arm; 21-Annular mounting groove; 211-Annular step; 212-Annular positioning groove; 213-Limiting groove; 22-Spring groove; 3-Pulley; 4-Torsion spring; 5-First bushing; 6-Screw cap; 7-Second bushing; 8-First damping structure; 81-Damping sleeve; 9-Second damping structure; 91-Butterfly spring; 92-Damping plate; 10-Mounting bolt. Detailed Implementation

[0023] 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.

[0024] like Figure 1 — Figure 3 As shown, this embodiment discloses a belt tensioner with a double-shear double-damping structure, including a connecting cover 1, a swing arm 2, and a pulley 3. The pulley 3 is installed at one end of the swing arm 2 for meshing with the engine belt for transmission. The other end of the swing arm 2 is provided with an annular mounting groove 21. The connecting cover 1 has an annular insert ring 11 in the middle, which is inserted into the central hole of the annular mounting groove 21. A torsion spring 4 is built into the annular mounting groove 21. The two legs of the torsion spring 4 extending out of the annular mounting groove 21 are respectively hooked onto two opposite inner sidewalls of the connecting cover 1. Under normal conditions, the torsion spring 4 applies a torque to the swing arm 2 to make it tend towards the direction of tensioning the belt.

[0025] A first bushing 5 is provided between the end faces of the connecting cover 1 and the annular mounting groove 21. The insert ring 11 of the connecting cover 1 passes through the central hole of the annular mounting groove 21 and is riveted to a screw cap 6. A second bushing 7 is provided between the screw cap 6 and the outer bottom surface of the annular mounting groove 21.

[0026] A first damping structure 8 is provided between the outer wall of the central hole of the annular mounting groove 21 and the torsion spring 4, and a second damping structure 9 is provided between the screw cap 6 and the outer bottom surface of the annular mounting groove 21.

[0027] Specifically, both the first bushing 5 and the second bushing 7 have an "L"-shaped cross-section. The inner wall of the opening of the annular mounting groove 21 is provided with an annular step 211. The outer wall of the first bushing 5 abuts against this annular step 211, while the opening end face and outer edge of the connecting cover 1 abut against the inner wall of the first bushing 5, thus achieving initial axial positioning and support between the connecting cover 1 and the swing arm 2. The outer wall of the second bushing 7 abuts against the inner wall of the screw cap 6. The bottom of the annular mounting groove 21 is provided with an annular positioning groove 212 that matches the second bushing 7. The lower end of the second bushing 7 is covered by this annular positioning groove 212, further enhancing the stability of the connection and the axial positioning accuracy. The first bushing 5 and the second bushing 7 work together to ensure the axial positioning of the swing arm 2 relative to the connecting cover 1, effectively preventing the swing arm 2 from swaying left or right during the swinging process.

[0028] The first damping structure 8 includes a damping sleeve 81 fitted onto the outer wall of the central hole of the annular mounting groove 21. When the belt load changes and causes the torsion spring 4 to twist, the inner diameter of the torsion spring 4 will shrink accordingly, thereby making close contact with the outer wall of the damping sleeve 81 and generating frictional resistance, forming a circumferential damping force, which hinders the excessive and rapid twisting of the torsion spring 4, and thus suppresses the swing of the swing arm 2.

[0029] The second damping structure 9 includes the other end face of the swing arm 2 away from the annular mounting groove 21 (i.e., opposite to the end where the pulley 3 is mounted; if the pulley is on the right end, then this end face is on the left end, but combined with...) Figure 2 This should refer to the end face of the swing arm 2 opposite to the annular mounting groove 21, specifically the end face of the swing arm 2 near the bottom of the annular mounting groove 21. Figure 2 An annular spring groove 22 is provided on the right end face of the middle swing arm 2. An axially compressible disc spring 91 is installed in the spring groove 22. A damping plate 92 is bonded and fixed in the inner cavity of the screw cap 6, and the damping plate 92 is in contact with the disc spring 91.

[0030] In this embodiment, the damping plate 92 is specifically bonded and fixed to the inner bottom surface of the second bushing 7. When the swing arm 2 swings due to the change in belt tension, it will cause the disc spring 91 to undergo axial compression or relaxation deformation. The deformation of the disc spring 91 generates circumferential damping force through the friction between it and the damping plate 92, which suppresses the swing of the swing arm 2 from another direction.

[0031] The connecting cover 1 has a central hole (not separately labeled, i.e. the hole where the insert ring 11 is located) in the middle. The mounting bolt 10 is inserted into the central hole, and the entire tensioning wheel can be fixedly installed in the predetermined position of the engine by means of the mounting bolt 10.

[0032] To prevent the swing arm 2 from swinging too much, a limiting groove 213 is provided at the open end of the annular mounting groove 21, and a limiting block 12 is correspondingly protruded on the peripheral wall of the connecting cover 1. The limiting block 12 is precisely positioned within the limiting groove 213. When the swing arm 2 swings to its limit position, the limiting block 12 will contact the side wall of the limiting groove 213, thereby limiting the further swing of the swing arm 2 and ensuring that the swing of the swing arm 2 is within a safe and stable range.

[0033] During operation, when the engine belt experiences a sudden and significant change in kinetic energy (such as sudden acceleration or deceleration), pulley 3 is impacted by the belt, causing the swing arm 2 to swing against the elastic force of the torsion spring 4. At this time, the friction between the torsion spring 4 and the damping sleeve 81 in the first damping structure 8, and the friction between the disc spring 91 and the damping plate 92 in the second damping structure 9, work together to generate a bidirectional circumferential damping force, effectively buffering and absorbing impact energy and suppressing the swing amplitude and speed of the swing arm 2. Simultaneously, the first bushing 5 and the second bushing 7 ensure the axial stability of the swing arm 2, preventing lateral swaying. The limiting block 12 and the limiting groove 213 limit the maximum swing angle. Through these multiple actions, the stability of the swing arm 2 is ensured, avoiding reduced transmission efficiency and temporary power interruption, making it particularly suitable for applications with stringent requirements for tensioner performance, such as high-power engines and construction machinery.

[0034] The above description is only 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 double-bushing double-damping structure belt tensioning wheel, comprising a connecting cover (1), a swing arm (2), and a pulley (3), wherein the pulley (3) is installed at one end of the swing arm (2), the other end of the swing arm (2) is provided with an annular mounting groove (21), the middle part of the connecting cover (1) is provided with an annular insertion ring (11), the insertion ring (11) is inserted into the middle hole of the annular mounting groove (21), a torsion spring (4) is built in the annular mounting groove (21), and the foot of the torsion spring (4) extending out of the annular mounting groove (21) is hooked on the inner side wall of the connecting cover (1), characterized in that: a first bushing (5) is arranged between the end face of the connecting cover (1) and the annular mounting groove (21), and a rotating cover (6) is riveted on the insertion ring (11) of the connecting cover (1) after passing through the middle hole of the annular mounting groove (21), a second bushing (7) is arranged between the rotating cover (6) and the outer bottom face of the annular mounting groove (21); a first damping structure (8) is arranged between the outer wall of the middle hole of the annular mounting groove (21) and the torsion spring (4), and a second damping structure (9) is arranged between the rotating cover (6) and the outer bottom face of the annular mounting groove (21). The cross section of the first bushing (5) and the second bushing (7) is "L" shaped, the annular mounting groove (21) is provided with an annular step (211) on the inner wall of the opening, the outer wall of the first bushing (5) is abutted on the annular step (211), and the opening end face and the outer wall edge of the connecting cover (1) are abutted on the inner wall of the first bushing (5); the outer wall of the second bushing (7) is abutted on the inner wall of the rotating cover (6), the bottom of the annular mounting groove (21) is provided with an annular positioning groove (212) matched with the second bushing (7), and the second bushing (7) is arranged on the annular positioning groove (212). The first damping structure (8) comprises a damping sleeve (81) sleeved on the outer wall of the middle hole of the annular mounting groove (21), and the inner diameter of the torsion spring (4) is reduced to contact the outer wall of the damping sleeve (81) after being twisted.

2. The dual bushing dual damping structural belt tensioner pulley of claim 1, wherein: The second damping structure (9) comprises an annular spring groove (22) arranged on the other end face of the swing arm (2) away from the annular mounting groove (21), a butterfly spring (91) capable of being axially compressed is installed in the spring groove (22), a damping plate (92) is bonded in the inner cavity of the rotating cover (6), and the damping plate (92) is in contact with the butterfly spring (91).

3. The dual bushing dual damping construction belt tensioning pulley of claim 1, wherein: The damping plate (92) is bonded on the inner bottom face of the second bushing (7).

4. The dual bushing dual damping construction belt tensioning pulley of claim 1, wherein: An installation bolt (10) is inserted into the middle hole of the connecting cover (1).

5. The dual bushing dual damping construction belt tensioning pulley of claim 4, wherein: A limiting groove (213) is arranged on the opening end of the annular mounting groove (21), a limiting block (12) is protruded on the peripheral wall of the connecting cover (1), and the limiting block (12) is arranged in the limiting groove (213).

6. The dual bushing dual damping structural belt tensioner pulley of claim 1, wherein: ​ 7. The dual bushing dual damping structural belt tensioner pulley of claim 1, wherein: ​

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