High-fatigue durable belt tensioning wheel for truck

Abstract

The utility model discloses a high-fatigue durable belt tensioning wheel for a truck. The high-fatigue durable belt tensioning wheel comprises a sealing cover, a swing arm, a flat spiral spring and a belt wheel. One end of the swing arm is provided with a pipe shaft installation belt wheel, the other end of the swing arm is provided with an installation groove with a shaft sleeve, the sealing cover is rotatably installed in the installation groove, and the flat spiral spring is arranged between the peripheral wall of the shaft sleeve and the sealing cover. A connecting pipe is arranged in the shaft sleeve, a coaxial friction groove is formed in the back face of the mounting groove, a damping disc is arranged in the groove, and the damping disc makes contact with the friction groove to generate damping and is connected with a sealing cover through a connecting shaft. Two ends of the connecting shaft are respectively riveted with the damping disc and are in interference fit with the insertion hole of the sealing cover. An annular groove and a rubber ring are arranged at the bottom of the friction groove, a limiting groove is formed in the peripheral wall, the edge of the damping disc is arranged in the limiting groove, and a protruding ring is arranged near the edge and makes contact with the wall of the annular contact groove at the bottom of the groove. According to the tensioning wheel, deflection is restrained through the damping structure, the flat spiral spring is combined, and the fatigue durability and the operation reliability under the high-load working condition are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of belt drive systems for automobile engines, and in particular to a high fatigue durability belt tensioner suitable for high-power, harsh working conditions such as trucks. Background Technology

[0002] Truck engines are mostly high-powered and often operate under harsh conditions and heavy loads. When ordinary tensioners work in the belt drive system of such engines, they are prone to high fatigue, resulting in poor durability and frequent replacement.

[0003] Although the cost of a single replacement is not high, frequent replacements can affect the reliability of truck operation. In addition, ordinary tension pulleys are prone to swaying during belt drive connection, and excessive swaying can cause transmission instability. Utility Model Content

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a high fatigue durability belt tensioner for trucks, so as to solve the problems of existing tensioners being prone to fatigue damage under high load and harsh working conditions, requiring frequent replacement, having poor operational reliability, and being prone to arbitrary sway leading to unreliable transmission.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-fatigue-resistance belt tensioner for trucks, comprising a cover, a swing arm, a planar spiral spring, and a pulley; one end of the swing arm is provided with a tubular shaft, and the pulley is rotatably mounted on the tubular shaft; the other end of the swing arm is provided with a mounting groove, and a protruding bushing is provided in the mounting groove, the inner hole of the bushing penetrating the mounting groove, and the cover is rotatably mounted on the mounting groove; the planar spiral spring is installed between the peripheral wall of the bushing and the cover; a connecting tube is provided in the bushing, and a coaxial friction groove is provided on the back of the mounting groove, a damping disc is provided in the friction groove, the damping disc contacts the friction groove and generates a certain damping, and the damping disc is connected to the cover through a connecting shaft.

[0006] Furthermore, the connecting shaft is rotatably mounted in the bushing via a copper sleeve. One end of the connecting shaft is riveted to the damping disc, and the other end is interference-fitted with the insertion hole of the cover. Furthermore, the bottom of the friction groove has an annular groove, and a rubber ring is provided between the annular groove and the damping disc; the peripheral wall of the friction groove has an annular limiting groove, and the edge of the damping disc is placed within the limiting groove; an annular convex ring is provided near the edge of the damping disc, and the bottom of the friction groove has an annular contact groove adapted to the convex ring, with the convex ring contacting the groove wall of the annular contact groove.

[0007] Furthermore, a gasket is disposed between the cover and the mounting groove, one end face of the planar spiral spring abuts against the gasket, a hook groove is provided on the peripheral wall of the cover, and a right angle hook of the planar spiral spring is hooked into the hook groove and a sealing plug is disposed thereon.

[0008] Furthermore, a bearing is configured in the central hole of the pulley, and the bearing is connected to the tube shaft by a pin. The pin is interference-fitted with the inner wall of the tube shaft, and a bearing sealing cap is snapped onto one end of the pulley. An annular sealing groove is provided around the tube shaft on the swing arm, and the other end of the pulley is rotatably placed in the annular sealing groove to prevent dust from entering the bearing.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. Improve fatigue durability and extend service life: By setting a planar spiral spring to provide continuous and stable tension force, and combined with the friction damping effect between the damping disc and the friction groove, the excessive vibration and impact of the tensioner under high load conditions are effectively suppressed, and the fatigue stress of key components (such as the swing arm and spring) is reduced, thereby significantly improving the fatigue durability of the tensioner, reducing the replacement frequency, and improving the reliability of truck operation.

[0011] 2. Prevents arbitrary swaying and ensures reliable transmission: The multiple contacts between the damping disc and the friction groove (the convex ring and the side wall of the contact groove, the edge of the damping disc and the limiting groove, the rubber ring buffer, etc.) generate a reliable damping torque, which can effectively limit the arbitrary swaying of the cover and the swing arm, control the swaying amplitude within a reasonable range, and avoid the problem of unreliable belt drive caused by excessive swaying.

[0012] 3. Stable structure and good sealing: The pulley is mounted on the tube shaft via bearings and pins, with one end secured by a bearing cap and the other end placed in the annular sealing groove of the swing arm, forming a good dustproof structure that prevents dust and other impurities from entering the bearing, further ensuring the flexibility of pulley rotation and the overall stability of the tensioner. The mounting structure of the flat spiral spring (washer, groove, and plug) also makes its operation more stable and reliable.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a perspective view of a specific embodiment of the present utility model;

[0015] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0016] Figure 3 This is an exploded view of a specific embodiment of the present utility model;

[0017] Figure 4 This is a structural diagram of the swing arm in a specific embodiment of the present utility model;

[0018] Figure 5 This is a structural diagram of the damping disc in a specific embodiment of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1-cap, 2-swing arm, 21-tube shaft, 22-mounting groove, 23-shaft sleeve, 24-annular sealing groove, 3-flat spiral spring, 31-hook groove, 32-seal plug, 4-pulley, 41-bearing, 42-shaft pin, 43-bearing plug, 5-connecting pipe, 6-friction groove, 61-annular groove, 62-limiting groove, 63-annular contact groove, 7-damping disc, 71-convex ring, 8-connecting shaft, 9-copper sleeve, 10-rubber ring, 11-gasket. Detailed Implementation

[0020] 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.

[0021] like Figure 1 — Figure 5 As shown, this embodiment discloses a high fatigue durability belt tensioner for trucks, including a cover 1, a swing arm 2, a flat spiral spring 3, and a pulley 4. The cover 1 is connected to the equipment base (such as an engine block).

[0022] One end of the swing arm 2 is provided with a tube shaft 21, and the pulley 4 is rotatably mounted on the tube shaft 21. Specifically, a bearing 41 is configured in the central hole of the pulley 4, and the bearing 41 is connected to the tube shaft 21 by a pin 42. The pin 42 is interference-fitted with the inner wall of the tube shaft 21 to ensure that the pulley 4 can rotate smoothly around the tube shaft 21.

[0023] To enhance sealing and prevent dust from entering the bearing 41 and affecting its lifespan and rotational flexibility, a bearing sealing cover 43 is snapped onto one end of the pulley 4; an annular sealing groove 24 is provided around the tube shaft 21 on the swing arm 2, and the other end of the pulley 4 is rotatably placed in the annular sealing groove 24, forming double dust protection.

[0024] The other end of the swing arm 2 is provided with a mounting groove 22, and a protruding bushing 23 is provided in the mounting groove 22. The inner hole of the bushing 23 passes through the mounting groove 22, and the cover 1 is rotatably mounted on the mounting groove 22.

[0025] The planar spiral spring 3 is installed between the peripheral wall of the bushing 23 and the cover 1 to provide continuous tension to the tensioning wheel.

[0026] To ensure the stability of the planar spiral spring 3 installation and the uniformity of the preload, a gasket 11 is provided between the cover 1 and the mounting groove 22, and one end face of the planar spiral spring 3 abuts against the gasket 11. A hook groove 31 is provided on the peripheral wall of the cover 1, and a right angle of the planar spiral spring 3 is hooked into the hook groove 31, and sealed by a plug 32 to prevent the spring from falling out and to improve the appearance.

[0027] The core improvement of this utility model lies in the damping anti-sway mechanism, the specific structure of which is as follows: A connecting pipe 5 is provided inside the bushing 23, and a coaxial friction groove 6 is provided on the back side of the mounting groove 22 (i.e., the side opposite to the cover 1). A damping disc 7 is provided inside the friction groove 6. The damping disc 7 contacts the friction groove 6 and generates a certain damping. The damping disc 7 is connected to the cover 1 through a connecting shaft 8. More specifically, the connecting shaft 8 is rotatably mounted in the bushing 23 through a copper sleeve 9 to reduce friction and improve the rotational flexibility of the connecting shaft 8. One end of the connecting shaft 8 is riveted to the damping disc 7 to ensure a firm connection; the other end is interference-fitted with the insertion hole of the cover 1, so that the rotation of the cover 1 can drive the damping disc 7 to rotate synchronously through the connecting shaft 8.

[0028] To achieve good damping effect and reliable yaw control, the friction groove 6 is designed as follows: The bottom of the friction groove 6 has an annular groove 61, and a rubber ring 10 is provided between the annular groove 61 and the damping disc 7. The rubber ring 10 provides elastic buffering and additional friction. The peripheral wall of the friction groove 6 has an annular limiting groove 62, and the edge of the damping disc 7 is placed within the limiting groove 62, limiting the radial displacement of the damping disc 7. Near the edge of the damping disc 7, an annular convex ring 71 is provided, and the bottom of the friction groove 6 has an annular contact groove 63 that matches the convex ring 71, with the convex ring 71 contacting the groove wall of the annular contact groove 63. When the cover 1 attempts to sway under the force of the belt, it will drive the connecting shaft 8 and the damping disc 7 to rotate. At this time, friction will be generated between the convex ring 71 and the groove wall of the annular contact groove 63, between the edge of the damping disc 7 and the side wall of the limiting groove 62, and between the rubber ring 10 and the bottom and side wall of the annular groove 61. The damping torque formed by these friction forces can effectively resist the swaying tendency of the cover 1, thereby controlling the swaying amplitude of the swing arm 2 and the pulley 4, and ensuring the smoothness and reliability of the belt drive.

[0029] In this embodiment, the material selection of each component can be determined according to the actual application requirements. For example, the swing arm 2 can be made of high-strength alloy steel, the pulley 4 can be made of cast iron or aluminum alloy, the flat spiral spring 3 can be made of high-quality spring steel, the damping disc 7 and the friction groove 6 can be made of wear-resistant cast iron or surface-hardened steel, and the rubber ring 10 can be made of high-temperature resistant and aging-resistant rubber materials, etc., to ensure its long service life and high reliability under the harsh working conditions of trucks.

[0030] In operation, the tensioner of this invention utilizes a planar spiral spring 3 to provide basic tension, causing the pulley 4 to press against the belt. When the belt attempts to cause the tensioner to wobble due to load changes or other reasons, the cover 1 rotates accordingly, driving the damping disc 7 to rotate within the friction groove 6 via the connecting shaft 8. Due to the multiple contacts and rubber ring buffering between the damping disc 7 and the friction groove 6, a significant damping force is generated, hindering the rotation of the damping disc 7 and thus suppressing the wobble of the cover 1 and the swing arm 2. This ensures the tensioner remains relatively stable during dynamic operation, reduces fatigue damage, extends service life, and guarantees the reliability of the belt drive.

[0031] 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 high fatigue durability belt tensioner for trucks, comprising a cover (1), a swing arm (2), a flat spiral spring (3), and a pulley (4); one end of the swing arm (2) is provided with a tubular shaft (21), and the pulley (4) is rotatably mounted on the tubular shaft (21); the other end of the swing arm (2) is provided with a mounting groove (22), a protruding bushing (23) is provided in the mounting groove (22), the inner hole of the bushing (23) penetrates the mounting groove (22), and the cover (1) is rotatably mounted on the mounting groove (22); the flat spiral spring (3) is installed between the peripheral wall of the bushing (23) and the cover (1); characterized in that: A connecting pipe (5) is provided inside the bushing (23), and a coaxial friction groove (6) is provided on the back of the mounting groove (22). A damping disc (7) is provided inside the friction groove (6). The damping disc (7) contacts the friction groove (6) and generates a certain damping. The damping disc (7) is connected to the cover (1) through a connecting shaft (8).

2. The high fatigue durability belt tensioner for trucks according to claim 1, characterized in that: The connecting shaft (8) is rotatably mounted in the bushing (23) via a copper sleeve (9). One end of the connecting shaft (8) is riveted to the damping disc (7), and the other end is interference-fitted with the insertion hole of the cover (1).

3. The high fatigue durability belt tensioner for trucks according to claim 1, characterized in that: The friction groove (6) has an annular groove (61) at its bottom, and a rubber ring (10) is provided between the annular groove (61) and the damping disk (7). The friction groove (6) has an annular limiting groove (62) on its peripheral wall, and the edge of the damping disk (7) is placed in the limiting groove (62). The damping disk (7) has an annular convex ring (71) near its edge, and the friction groove (6) has an annular contact groove (63) at its bottom that matches the convex ring (71). The convex ring (71) contacts the groove wall of the annular contact groove (63).

4. The high fatigue durability belt tensioner for trucks according to claim 1, characterized in that: A gasket (11) is disposed between the cover (1) and the mounting groove (22). One end face of the planar spiral spring (3) abuts against the gasket (11). A hook groove (31) is provided on the peripheral wall of the cover (1). A right angle of the planar spiral spring (3) is hooked into the hook groove (31) and a plug (32) is disposed to seal it.

5. The high fatigue durability belt tensioner for trucks according to claim 1, characterized in that: The pulley (4) has a bearing (41) in its central hole. The bearing (41) is connected to the tube shaft (21) by a shaft pin (42). The shaft pin (42) is interference-fitted with the inner wall of the tube shaft (21). One end of the pulley (4) is secured with a bearing sealing cap (43). The swing arm (2) is provided with an annular sealing groove (24) around the tube shaft (21). The other end of the pulley (4) is rotatably placed in the annular sealing groove (24).

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