Belt tensioner with overload protection

Abstract

The utility model is suitable for the technical field of belt tensioning wheel, provide a kind of belt tensioning wheel with overload protection, including cantilever, install tensioning assembly on the cantilever, through the setting of wheel body component and overload component, design automatic protection mechanism, through the synergic action of centrifugal block and overload spring, air inlet valve and exhaust valve, when centrifugal force is too large, friction block can contact with rubber ring, produce friction force, to limit the rotational speed of transmission system, prevent overload condition to occur, guarantee the safe operation of system, the contact of friction block and rubber ring can control the load of system, so that when transmission system load is too large, it can stop in time, avoid the damage of equipment and unnecessary energy consumption due to excessive load, through the sliding of centrifugal block and the contact adjustment mechanism of friction block, fine adjustment and large-scale adjustment can be realized, both ensure the efficient operation of system under normal working condition, and can provide effective protection under abnormal working condition.

Description

Technical Field

[0001] This utility model belongs to the field of belt tensioner technology, and in particular relates to a belt tensioner with overload protection. Background Technology

[0002] A tensioner pulley, also known as a belt tensioner, is a belt tensioning device used in automotive transmission systems. Based on its location, it is divided into accessory tensioners (such as alternator belt tensioners, air conditioning belt tensioners, and supercharger belt tensioners) and timing belt tensioners. A tensioner pulley mainly consists of a fixed housing, tensioning arm, pulley body, torsion spring, rolling bearing, and spring bushing. It automatically adjusts the tension according to different belt tightness levels, ensuring a stable, safe, and reliable transmission system. The function of the tensioner pulley is to adjust the belt tension, reduce belt vibration during operation, and prevent belt slippage to a certain extent, ensuring the normal and stable operation of the transmission system. It is generally replaced along with the belt, idler pulley, and other cooperating accessories to avoid future problems. To prevent damage caused by overload of the transmission system, overload protection is required for the belt tensioner, thereby increasing the safety of the transmission system.

[0003] Existing belt tensioners only adjust the belt tension to ensure that the belt is always under appropriate tension during the belt drive process. However, if the belt drive speed is too fast and the belt tension exceeds the tension adjustment range, it will cause the entire transmission system to collapse. It may also cause the belt to fall off, get tangled and jam, resulting in poor stability of the belt drive system. Utility Model Content

[0004] The purpose of this invention is to provide a belt tensioner with overload protection, which aims to solve the problem that existing belt tensioners only adjust the belt tension to keep the belt in a suitable tension state during the belt drive process. However, if the belt drive speed is too fast and the belt tension exceeds the tension adjustment range, the entire transmission system will collapse, and the belt may fall off, get tangled and jam, resulting in poor stability of the belt drive system.

[0005] This utility model is implemented as follows: a belt tensioner with overload protection, comprising:

[0006] A cantilever arm, on which a tensioning assembly is mounted, a wheel assembly is mounted on the tensioning assembly, and an overload assembly is mounted on the wheel assembly;

[0007] The wheel assembly includes a drive shaft and a tensioner wheel;

[0008] The overload assembly includes a protective seat, a rubber ring, a sealing cover, and an overload unit. The overload unit includes:

[0009] The bracket is fixedly mounted on the drive shaft;

[0010] Overload seat, fixedly mounted on the bracket;

[0011] The overload spring is fixedly mounted on the overload seat.

[0012] A centrifugal block is fixedly mounted on an overload spring, and the centrifugal block is slidably engaged with the overload seat.

[0013] The friction block is fixedly installed on the centrifugal block and is used to limit the position of the support seat in conjunction with the rubber ring.

[0014] An intake valve and an exhaust valve are also fixedly installed on the bracket base for adjusting the overload spring.

[0015] As a further embodiment of this utility model, both the intake valve and the exhaust valve are one-way valves, the number of overload units is several, and the several overload units are equidistantly distributed in the circumferential direction of the protective seat, and the rubber ring is elastic.

[0016] As a further embodiment of this utility model, the protective seat is fixedly installed on the cantilever, the rubber ring is fixedly installed on the inner wall of the protective seat, the sealing cover is snapped onto the protective seat, and the sealing cover is also provided with a vent hole.

[0017] As a further embodiment of this utility model, the tensioning component includes:

[0018] The mounting bracket is fixedly installed on the cantilever.

[0019] The tension spring is fixedly mounted on the mounting base.

[0020] The fixing rod is fixedly installed on the fixing base;

[0021] A tensioning column is fixedly installed on a tensioning spring, and the tensioning column is slidably engaged with a fixed base, a cantilever, and a fixed rod.

[0022] A fixing block is fixedly installed on the end face of the tensioning column, and the fixing block slides with the cantilever.

[0023] As a further embodiment of this utility model, the drive shaft is rotatably fitted onto the fixed block, and the tensioning wheel is fixedly mounted on the drive shaft.

[0024] As a further embodiment of this utility model, a fixing plate is also fixedly installed on the cantilever, the fixing plate has mounting holes, and the cantilever also has a sliding groove for limiting the movement stroke of the fixing block.

[0025] This utility model provides a belt tensioner with overload protection. Through the design of the pulley assembly and overload component, an automatic protection mechanism is implemented. The centrifugal block, overload spring, intake valve, and exhaust valve work together to generate friction when the centrifugal force is too high. This limits the speed of the transmission system, preventing overload and ensuring safe operation. The contact between the friction block and the rubber ring controls the system load, allowing for timely shutdown when the transmission system is overloaded, avoiding equipment damage and unnecessary energy consumption due to excessive load. The sliding of the centrifugal block and the contact adjustment mechanism with the friction block enable both fine-tuning and large-scale adjustment, ensuring efficient operation under normal conditions and providing effective protection under abnormal conditions. Attached Figure Description

[0026] Figure 1 A three-dimensional structural diagram of a belt tensioner with overload protection provided for an embodiment of this utility model;

[0027] Figure 2 An internal cross-sectional view of a belt tensioner with overload protection provided for an embodiment of this utility model;

[0028] Figure 3 A partial cross-sectional view of an overload component of a belt tensioner with overload protection provided in an embodiment of this utility model;

[0029] Figure 4 This is a partial cross-sectional view of the overload unit of a belt tensioner with overload protection, provided for an embodiment of this utility model.

[0030] In the attached diagram: 1. Cantilever; 11. Fixing plate; 101. Slide groove; 2. Tensioning assembly; 21. Fixing seat; 22. Tensioning spring; 23. Fixing rod; 24. Tensioning column; 25. Fixing block; 3. Wheel assembly; 31. Drive shaft; 32. Tensioning wheel; 4. Overload assembly; 41. Protective seat; 42. Rubber ring; 43. Sealing cover; 44. Overload unit; 441. Bracket seat; 442. Overload seat; 443. Overload spring; 444. Centrifugal block; 445. Friction block; 446. Intake valve; 447. Exhaust valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] It is understood that the terms “first” and “second” as used herein may be used to describe various elements, but unless otherwise stated, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0033] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0034] like Figures 1 to 4 As shown, a belt tensioner with overload protection is provided in one embodiment of this utility model, comprising:

[0035] Cantilever 1, tensioning assembly 2 is installed on cantilever 1, wheel assembly 3 is installed on tensioning assembly 2, and overload assembly 4 is installed on wheel assembly 3;

[0036] Wheel assembly 3 includes a drive shaft 31 and a tensioner 32;

[0037] Overload assembly 4 includes a protective seat 41, a rubber ring 42, a sealing cover 43, and an overload unit 44, the overload unit 44 including:

[0038] The bracket 441 is fixedly mounted on the drive shaft 31;

[0039] Overload seat 442 is fixedly installed on bracket seat 441;

[0040] Overload spring 443 is fixedly installed on overload seat 442;

[0041] Centrifugal block 444 is fixedly mounted on overload spring 443, and centrifugal block 444 is slidably engaged with overload seat 442;

[0042] Friction block 445 is fixedly installed on centrifugal block 444 and is used to cooperate with rubber ring 42 to limit the support seat 441;

[0043] An intake valve 446 and an exhaust valve 447 are also fixedly installed on the bracket 441 for adjusting the overload spring 443;

[0044] Specifically, as a further embodiment of this utility model, both the intake valve 446 and the exhaust valve 447 are one-way valves, the number of overload units 44 is several, and the several overload units 44 are equidistantly distributed in the circumferential direction of the protective seat 41, and the rubber ring 42 is elastic.

[0045] In this embodiment of the invention, during practical application, the tensioning wheel 32 is connected to the belt of the transmission system, and the belt provides power to the tensioning wheel 32, causing the tensioning wheel 32 to drive the support seat 441 to rotate via the drive shaft 31. When the centrifugal force on the centrifugal block 444 is less than the pulling force of the overload spring 443, the centrifugal block 444 moves slightly, and the friction block 445 does not contact the rubber ring 42. When the centrifugal force on the centrifugal block 444 is greater than the pulling force of the overload spring 443, the centrifugal block 444 slides significantly on the overload seat 442, and the friction block... When 445 contacts and is squeezed by the rubber ring 42, the support base 441 will be subject to rotational resistance due to the limitation of frictional resistance. This will cause the drive shaft 31 to be subject to resistance, causing the tension wheel 32 to stop rotating. At this time, the frictional resistance between the belt of the transmission system and the tension wheel 32 increases, limiting the speed of the transmission system and preventing the transmission system from being overloaded and causing damage to the equipment. When the centrifugal block 444 slides, the air intake valve 446 draws in air, and when the centrifugal block 444 resets, the air is discharged through the exhaust valve 447, thereby controlling the moving speed of the centrifugal block 444 and preventing the centrifugal block 444 from moving too fast.

[0046] An automatic protection mechanism is designed by setting up wheel assembly 3 and overload assembly 4. Through the coordinated action of centrifugal block 444, overload spring 443, intake valve 446 and exhaust valve 447, when the centrifugal force is too large, friction block 445 will contact rubber ring 42 to generate friction, thereby limiting the speed of the transmission system, preventing overload, and ensuring the safe operation of the system. The contact between friction block 445 and rubber ring 42 can control the load of the system, so that when the load of the transmission system is too large, it can stop in time, avoiding equipment damage and unnecessary energy consumption caused by excessive load. Through the sliding of centrifugal block 444 and the contact adjustment mechanism of friction block 445, fine adjustment and large-scale adjustment can be achieved, which not only ensures the efficient operation of the system under normal working conditions, but also provides effective protection under abnormal working conditions.

[0047] like Figures 1 to 4 As shown, as a further embodiment of the present utility model, the protective seat 41 is fixedly installed on the cantilever 1, the rubber ring 42 is fixedly installed on the inner wall of the protective seat 41, the sealing cover 43 is snapped onto the protective seat 41, and the sealing cover 43 is also provided with a vent hole.

[0048] In this embodiment of the utility model, the vent hole facilitates the intake and exhaust of air by the intake valve 446 and the exhaust valve 447. Furthermore, the rubber ring 42 deforms after being squeezed by the friction block 445, which further enhances the load limiting effect on the tensioning wheel 32 and greatly improves the safety of the transmission system operation.

[0049] like Figures 1 to 4As shown, in a further embodiment of this utility model, the tensioning component 2 includes:

[0050] The mounting base 21 is fixedly installed on the cantilever 1;

[0051] The tension spring 22 is fixedly mounted on the fixed base 21;

[0052] The fixing rod 23 is fixedly installed on the fixing base 21;

[0053] The tensioning column 24 is fixedly installed on the tensioning spring 22, and the tensioning column 24 slides in conjunction with the fixed base 21, the cantilever 1 and the fixed rod 23.

[0054] The fixing block 25 is fixedly installed on the end face of the tensioning column 24, and the fixing block 25 is in sliding fit with the cantilever 1;

[0055] Specifically, as a further embodiment of this utility model, the drive shaft 31 is rotatably fitted on the fixed block 25, and the tension wheel 32 is fixedly installed on the drive shaft 31;

[0056] Specifically, as a further embodiment of this utility model, a fixing plate 11 is also fixedly installed on the cantilever 1, the fixing plate 11 is provided with mounting holes, and the cantilever 1 is also provided with a sliding groove 101 for limiting the movement of the fixing block 25.

[0057] In this embodiment of the present invention, in actual application, the fixed block 25 is subjected to the force of the tension spring 22 through the tensioning column 24 and moves back and forth on the cantilever 1, so that the belt of the transmission system is always in contact with the tensioning wheel 32, thereby adjusting the tension of the belt of the transmission system and further improving the safety of the transmission system during operation.

[0058] 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 and improvements 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 belt tensioner with overload protection, characterized in that, include: A cantilever (1), a tensioning assembly (2) is installed on the cantilever (1), a wheel assembly (3) is installed on the tensioning assembly (2), and an overload assembly (4) is installed on the wheel assembly (3). The wheel assembly (3) includes a drive shaft (31) and a tensioner (32); The overload assembly (4) includes a protective seat (41), a rubber ring (42), a sealing cap (43), and an overload unit (44), the overload unit (44) including: The bracket (441) is fixedly mounted on the drive shaft (31); The overload seat (442) is fixedly installed on the bracket seat (441); An overload spring (443) is fixedly mounted on an overload seat (442); Centrifugal block (444) is fixedly mounted on overload spring (443), and the centrifugal block (444) is slidably engaged with overload seat (442); Friction block (445) is fixedly installed on centrifugal block (444) and is used to cooperate with rubber ring (42) to limit the support seat (441); An intake valve (446) and an exhaust valve (447) are also fixedly installed on the bracket (441) for adjusting the overload spring (443).

2. A belt tensioner with overload protection according to claim 1, characterized in that, The intake valve (446) and exhaust valve (447) are both one-way valves. There are several overload units (44), which are equidistantly distributed in the circumferential direction of the protective seat (41). The rubber ring (42) is elastic.

3. A belt tensioner with overload protection according to claim 1, characterized in that, The protective seat (41) is fixedly installed on the cantilever (1), the rubber ring (42) is fixedly installed on the inner wall of the protective seat (41), the sealing cover (43) is snapped onto the protective seat (41), and the sealing cover (43) is also provided with a vent hole.

4. A belt tensioner with overload protection according to claim 1, characterized in that, The tensioning component (2) includes: The mounting base (21) is fixedly installed on the cantilever (1); The tension spring (22) is fixedly installed on the fixed base (21); The fixing rod (23) is fixedly installed on the fixing seat (21); The tensioning column (24) is fixedly installed on the tensioning spring (22), and the tensioning column (24) is in sliding cooperation with the fixed seat (21), the cantilever (1) and the fixed rod (23); A fixing block (25) is fixedly installed on the end face of the tensioning column (24), and the fixing block (25) slides with the cantilever (1).

5. A belt tensioner with overload protection according to claim 4, characterized in that, The drive shaft (31) is rotatably fitted on the fixed block (25), and the tension wheel (32) is fixedly installed on the drive shaft (31).

6. A belt tensioner with overload protection according to claim 4, characterized in that, A fixing plate (11) is also fixedly installed on the cantilever (1). The fixing plate (11) has an installation hole, and the cantilever (1) also has a sliding groove (101) for limiting the movement of the fixing block (25).

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