A magnetic tensioner

Abstract

The utility model provides a magnetic tensioner, including a tensioning arm, a shell, a first magnet, and a second magnet. The shell is rotatably connected to one end of the tensioning arm, and a belt support wheel is rotatably connected to the other end of the tensioning arm. An annular magnet installation cavity is formed between the shell and the tensioning arm, and the first magnet and the second magnet are installed in the annular magnet installation cavity. The second magnet is connected to the shell and rotates with the rotation of the second shell. A stopper is provided on the tensioning arm, and the first magnet is located between the second magnet and the stopper. The first magnet and the second magnet are placed opposite to each other with the same poles. The utility model generates torque in the tensioning arm and achieves a belt tensioning effect through the repulsive force between the first magnet and the second magnet. The first magnet and the second magnet can maintain a stable magnetic force for a long time under a normal working environment, so that the torque of the tensioning arm will not decay, so that the tensioner can provide a relatively stable tensioning force for the belt.

Description

Technical Field

[0001] The utility model relates to the technical field of tensioners, in particular to a magnetic tensioner. Background Art

[0002] Tensioners are widely used in belt drive systems. In automotive accessory systems, constant belt tension is required. The function of a belt tensioner is to ensure that the transmission belt (such as a timing belt or an accessory belt) maintains proper tension to ensure stable operation of the system and improve transmission efficiency.

[0003] Among them, the existing mechanical tensioning devices usually use springs as elastic elements and provide tensioning force. The existing mechanical tensioning devices have the following shortcomings: 1. The spring in the tensioning device is in use. The spring is repeatedly subjected to loads, especially when the load reaches or exceeds the elastic limit of the spring, the spring is prone to irreversible deformation or fatigue damage, resulting in a decrease in the elastic force of the spring, which in turn causes the torque of the tensioning device to decay and the tensioning force to decrease, and thus cannot provide stable tensioning force for the belt. 2. In order to install a larger spring, the existing mechanical tensioning device needs to design a more complex and larger object and a fixed base structure in the tensioning device, resulting in a larger overall volume and weight of the tensioning device, which requires a larger installation space during installation and has poor applicability. Summary of the invention

[0004] The utility model aims to solve the deficiencies in the prior art and provide a magnetic tensioner.

[0005] The objective of the present invention is achieved through the following technical scheme: a magnetic tensioner, comprising a tensioning arm, a shell, a first magnet, and a second magnet, wherein the shell is rotatably connected to one end of the tensioning arm, and a support roller is rotatably connected to the other end of the tensioning arm; an annular magnet mounting cavity is formed between the shell and the tensioning arm, and the first magnet and the second magnet are mounted in the annular magnet mounting cavity; the second magnet is connected to the shell and rotates with the rotation of the second shell; a stop block is provided on the tensioning arm, and the first magnet is located between the second magnet and the stop block; the first magnet and the second magnet are placed opposite to each other with the same poles.

[0006] In the utility model, the housing is fixed on the belt drive system and is relatively stationary with the belt drive system, the tensioning arm can rotate relative to the housing, and the belt support roller on the tensioning arm supports the belt on the belt drive system and provides tensioning force for the belt. Since the first magnet and the second magnet are placed opposite to each other with the same poles, a repulsive force is generated between the two magnetic poles directly facing each other, and the repulsive force causes the tensioning arm to generate torque, and under the action of the torque of the tensioning arm, tension is generated on the belt, thereby producing a tensioning effect on the belt. The utility model causes the tensioning arm to generate torque and achieve a belt tensioning effect through the repulsive force between the first magnet and the second magnet. The first magnet and the second magnet can maintain a stable magnetic force for a long time under normal working conditions, so that the torque of the tensioning arm will not decay, so that the tensioner can provide a relatively stable tensioning force for the belt, and avoids the problem of torque decay caused by irreversible deformation or fatigue damage of the spring in the traditional mechanical tensioning device due to repeated load. In the utility model, the first magnet and the second magnet replace the spring in the traditional mechanical tensioning device. The first magnet and the second magnet can be compactly installed in the annular magnet installation cavity between the shell and the tensioning arm, thereby reducing the overall volume of the tensioner, reducing the space occupied by the tensioner during installation, and improving the applicability of the tensioner.

[0007] Preferably, the housing is provided with a groove, and the second magnet is placed in the groove.

[0008] Preferably, the first magnet is placed in the damping housing assembly, and the damping housing assembly contacts the inner wall of the housing. The damping housing assembly wraps the first magnet, and the damping housing assembly contacts the inner wall of the housing and generates friction between the damping housing assembly and the inner wall of the housing.

[0009] Preferably, the damping shell assembly comprises a damping shell and a damping sealing plate, and a magnet accommodating cavity for accommodating the first magnet is formed between the damping shell and the damping sealing plate.

[0010] Preferably, both the first magnet and the second magnet are permanent magnets, and both the first magnet and the second magnet are arc-shaped.

[0011] Preferably, a limiting groove is provided on the tensioning arm, and a limiting protrusion is provided on the outer shell, and the limiting protrusion is located in the limiting groove.

[0012] Preferably, a sleeve is provided on the tensioning arm, a first bearing is provided in the sleeve, the outer shell and the tensioning arm are connected via a core shaft, the core shaft passes through the first bearing, a core shaft hole is provided on the outer shell, and one end of the core shaft is fixedly connected to the core shaft hole.

[0013] Preferably, the first bearing is a self-lubricating bearing.

[0014] Preferably, a dust ring is provided between the housing and the tensioning arm.

[0015] Preferably, a wheel axle is provided on one end of the tensioning arm away from the housing, and the support roller is rotatably connected to the wheel axle.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model uses the repulsive force between the first magnet and the second magnet to make the tensioning arm generate torque and achieve the belt tensioning effect. The first magnet and the second magnet can maintain stable magnetic force for a long time under normal working conditions, so that the torque of the tensioning arm will not decay, and the tensioner can provide a relatively stable tensioning force for the belt, avoiding the problem of torque attenuation caused by irreversible deformation or fatigue damage of the spring in the traditional mechanical tensioning device due to repeated load.

[0018] 2. In the utility model, the first magnet and the second magnet replace the spring in the traditional mechanical tensioning device. The first magnet and the second magnet can be compactly installed in the annular magnet installation cavity between the shell and the tensioning arm, which reduces the overall volume of the tensioner, reduces the space occupied by the tensioner during installation, and improves the applicability of the tensioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of one direction of the utility model.

[0020] Figure 2 It is a structural schematic diagram of another direction of the utility model.

[0021] Figure 3 It is an exploded view of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the tensioning arm.

[0023] Figure 5 A schematic diagram of the structure of the shell.

[0024] Figure 6 It is a side view of the utility model.

[0025] Figure 7 for Figure 6 Cross-sectional view along the AA direction.

[0026] In the figure: 1, core shaft, 2, first bearing, 3, tensioning arm, 3-1, sleeve, 3-2, stopper, 3-3, limiting groove, 3-4, axle hole, 4, dust ring, 5, damping housing, 6, first magnet, 7, damping sealing plate, 8, housing, 8-1, groove, 8-2, core shaft hole, 8-3, limiting protrusion, 9, second magnet, 10, axle, 11, dust cover, 12, support roller, 13, second bearing. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] like Figure 1-7 As shown, a magnetic tensioner includes a tensioning arm 3, a housing 8, a first magnet 6, and a second magnet 9. The housing 8 is rotatably connected to one end of the tensioning arm 3, and a support roller 12 is rotatably connected to the other end of the tensioning arm 3. An annular magnet mounting cavity is formed between the housing 8 and the tensioning arm 3, and the first magnet 6 and the second magnet 9 are mounted in the annular magnet mounting cavity; the second magnet 9 is connected to the housing and rotates with the rotation of the second housing; a stopper 3-2 is provided on the tensioning arm 3, and the first magnet 6 is located between the second magnet 9 and the stopper 3-2; the first magnet 6 and the second magnet 9 are placed opposite to each other with the same poles.

[0030] In the utility model, the housing is fixed on the belt drive system and is relatively stationary with the belt drive system, the tension arm 3 can rotate relative to the housing, and the belt support roller 12 on the tension arm 3 supports the belt on the belt drive system and provides tensioning force for the belt. Since the first magnet 6 and the second magnet 9 are placed opposite to each other with the same poles, a repulsive force is generated between the two magnetic poles facing each other of the first magnet 6 and the second magnet 9, and the repulsive force causes the tension arm 3 to generate torque, and under the action of the torque of the tension arm 3, tension is generated on the belt, thereby generating a tensioning effect on the belt.

[0031] The outer shell 8 is cylindrical in shape, and a mounting hole is provided on the outer shell 8 . The outer shell is fixedly connected to the belt drive system through the mounting hole.

[0032] A sleeve 3-1 is provided on the tensioning arm 3, a first bearing 2 is provided in the sleeve 3-1, the housing and the tensioning arm 3 are connected via a core shaft 1, the core shaft 1 passes through the first bearing 2, a core shaft hole 8-2 is provided on the housing, one end of the core shaft 1 is fixedly connected to the core shaft hole 8-2. The tensioning arm 3 rotates around the core shaft 1. Preferably, the first bearing 2 is a self-lubricating bearing. The self-lubricating bearing can significantly reduce the friction between the bearing and the core shaft 1.

[0033] A wheel shaft 10 is provided on one end of the tensioning arm 3 away from the housing, and a support roller 12 is rotatably connected to the wheel shaft 10. A second bearing 13 is provided between the wheel shaft 10 and the support roller 12. In some embodiments of the present application, a ball bearing is used for the second bearing 13. A dust cover 11 is provided on one side of the support roller 12.

[0034] The first magnet 6 and the second magnet 9 are both permanent magnets, and the first magnet 6 and the second magnet 9 are both arc-shaped. In some embodiments of the present application, the first magnet 6 and the second magnet 9 are made of neodymium iron boron magnets.

[0035] The housing is provided with a groove 8-1, and the second magnet 9 is placed in the groove 8-1. The groove 8-1 matches the shape of the second magnet 9, and the second magnet 9 is embedded in the groove 8-1.

[0036] The first magnet 6 is placed in the damping housing assembly, and the damping housing assembly contacts the inner wall of the housing. Specifically, the damping housing assembly includes a damping housing 5 and a damping sealing plate 7, one end of the damping housing 5 is open, and the damping sealing plate 7 is connected to the open end of the damping housing 5. A magnet accommodating cavity for accommodating the first magnet 6 is formed between the damping housing 5 and the damping sealing plate 7, and the magnet accommodating cavity matches the shape of the first magnet 6.

[0037] Since the belt generates certain vibrations during operation, the vibrations of the belt will be transmitted to the tension arm 3, causing the tension arm 3 to swing back and forth. The reciprocating swing of the tension arm 3 will cause wear on the shaft hole connection between the housing and the tension arm 3. In the utility model, by arranging the damping housing 5 assembly outside the first magnet 6, when the tension arm 3 swings back and forth, the damping housing assembly outside the first magnet 6 will generate relative friction with the inner wall of the housing, generating a damping effect on the relative rotation between the housing and the tension arm, consuming the kinetic energy of the tension arm 3 when swinging by friction energy consumption, reducing the swing amplitude of the tension arm 3, and thus reducing the wear on the shaft hole connection between the housing and the tension arm 3.

[0038] In some embodiments of the present application, the material of the damping shell 5 and the damping sealing plate 7 is damping rubber.

[0039] Furthermore, a limiting groove 3-3 is provided on the tensioning arm 3, and a limiting protrusion 8-3 is provided on the housing, and the limiting protrusion 8-3 is located in the limiting groove 3-3. The relative rotation angle between the housing and the tensioning arm 3 is limited by the cooperation between the limiting protrusion 8-3 and the limiting groove 3-3.

[0040] A dustproof ring 4 is provided between the housing and the tensioning arm 3. The dustproof ring 4 is made of rubber. The dustproof ring 4 has a dustproof effect and is used to prevent external dust from entering the annular magnet installation cavity between the housing and the tensioning arm 3.

[0041] The utility model uses the repulsive force between the first magnet 6 and the second magnet 9 to make the tension arm 3 generate torque and achieve the belt tensioning effect. The first magnet 6 and the second magnet 9 can maintain a stable magnetic force for a long time under normal working conditions, so that the torque of the tension arm 3 will not decay, so that the tensioner can provide a relatively stable tensioning force for the belt, avoiding the problem of torque decay caused by irreversible deformation or fatigue damage of the spring in the traditional mechanical tensioning device due to repeated load. In the utility model, the first magnet 6 and the second magnet 9 replace the spring in the traditional mechanical tensioning device, and the first magnet 6 and the second magnet 9 can be compactly installed in the annular magnet installation cavity between the housing and the tension arm 3, reducing the overall volume of the tensioner, reducing the space occupied by the tensioner during installation, and improving the applicability of the tensioner.

[0042] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A magnetic tensioner, characterized in that: It includes a tensioning arm, a shell, a first magnet, and a second magnet. The shell is rotatably connected to one end of the tensioning arm, and a support wheel is rotatably connected to the other end of the tensioning arm. An annular magnet mounting cavity is formed between the shell and the tensioning arm, and the first magnet and the second magnet are mounted in the annular magnet mounting cavity. The second magnet is connected to the housing and rotates with the rotation of the second housing; A stopper is provided on the tensioning arm, and the first magnet is located between the second magnet and the stopper; the first magnet and the second magnet are placed opposite to each other with the same poles.

2. A magnetic tensioner according to claim 1, characterized in that: The shell is provided with a groove, and the second magnet is placed in the groove.

3. A magnetic tensioner according to claim 1, characterized in that: The first magnet is placed in the damping housing assembly, and the damping housing assembly is in contact with the inner wall of the housing.

4. A magnetic tensioner according to claim 3, characterized in that: The damping shell assembly comprises a damping shell and a damping sealing plate, and a magnet accommodating cavity for accommodating the first magnet is formed between the damping shell and the damping sealing plate.

5. The magnetic tensioner according to claim 1, characterized in that: The first magnet and the second magnet are both permanent magnets, and both the first magnet and the second magnet are arc-shaped.

6. A magnetic tensioner according to any one of claims 1 to 5, characterized in that: A limiting groove is arranged on the tensioning arm, and a limiting convex block is arranged on the shell, and the limiting convex block is located in the limiting groove.

7. A magnetic tensioner according to any one of claims 1 to 5, characterized in that: The tensioning arm is provided with a shaft sleeve, in which a first bearing is provided, the outer shell and the tensioning arm are connected via a core shaft, the core shaft passes through the first bearing, the outer shell is provided with a core shaft hole, and one end of the core shaft is fixedly connected to the core shaft hole.

8. A magnetic tensioner according to claim 7, characterized in that: The first bearing is a self-lubricating bearing.

9. A magnetic tensioner according to any one of claims 1 to 5, characterized in that: A dustproof ring is arranged between the shell and the tensioning arm.

10. A magnetic tensioner according to any one of claims 1 to 5, characterized in that: A wheel shaft is arranged on one end of the tensioning arm away from the shell, and the belt supporting wheel is rotatably connected to the wheel shaft.

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