Torsional vibration damper

Abstract

A torsional vibration damper comprises a torsion shaft and a first damping device used for applying force opposite to the relative rotation direction of the torsion shaft, and the first damping device comprises at least one first magnet connected to the torsion shaft and at least one second magnet arranged on the movement track of the first magnet. The opposite positions of the first magnet and the second magnet have the same polarity. The characteristic that like poles repel each other is utilized, and the magnets with opposite like poles are arranged as damping devices, so that damping force opposite to the rotation direction of the torsion shaft is provided, and the damping effect is achieved. Besides, a set of electromagnetic damping device is further arranged, when the torsion shaft rotates, the electromagnetic coil and the magnet move relatively, magnetic lines are cut to generate current, a reverse magnetic field is generated at the same time, damping force for preventing relative movement is formed, and therefore the vibration reduction effect is achieved. The damping device is simple in structure, high in response speed, good in damping effect and convenient in damping force adjustment.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration dampers, in particular to a torsional vibration damper using magnetic force. Background Art

[0002] Torsional vibration damper refers to a component installed on a torsion shaft to generate a damping torque or a counter torque to reduce the torsional vibration amplitude of the torsion shaft. Torsional vibration dampers in the prior art often use elastic components such as rubber, springs, hydraulic cylinders, and air cylinders to provide buffer damping, or a counter torque to resist or reduce the torsional vibration amplitude of the torsion shaft. However, the damping components in the prior art have problems such as slow response, inconvenient damping force adjustment, or complex structure, high failure rate, poor durability, high manufacturing cost and high maintenance cost. Summary of the invention

[0003] The utility model aims to provide a torsional vibration damper using magnetic force with fast response speed, good damping effect and convenient damping force adjustment to address the defects of the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A torsional vibration damper includes a torsion shaft and a first damping device for applying a force in the opposite direction of rotation of the torsion shaft, characterized in that: the first damping device is at least one first magnet connected to the torsion shaft and at least one second magnet arranged on the motion track of the first magnet; the first magnet and the second magnet have the same relative position polarity. When the torsion shaft is rotated under force, the first magnet connected to the torsion shaft rotates synchronously and the distance between the first magnet and the second magnet is close. Since the first magnet and the second magnet have the same relative position polarity, a force in the opposite direction of rotation of the torsion shaft will be generated between the first magnet and the second magnet to resist the rotation of the torsion shaft, thereby achieving a vibration reduction effect. At the same time, due to the property of magnets of the same sex repelling each other, when the torsion shaft is not subjected to force, it provides elasticity and maintains the position of the torsion shaft. Since the magnetic field has the characteristic of timely response to the force of the same sex repelling each other, and the closer the distance between the two magnetic fields, the greater the repulsive force. Therefore, the vibration damper using the magnetic damping device has the characteristics of sensitive response, greater damping when the torque is greater, and good vibration reduction effect. In addition, no matter whether the torsion shaft rotates forward or reversely, the magnetic damping device can provide the same damping force and achieve the same vibration reduction effect.

[0006] Its further feature is that the first magnet is coaxially arranged on the torsion shaft, and the second magnet is arranged in the fixing ring and coaxially arranged with the torsion shaft. The first magnet, the second magnet and the torsion shaft are coaxially arranged and rotate synchronously with the torsion shaft, and the structure is compact.

[0007] Preferably: the torsion shaft is evenly provided with a plurality of first magnets in the circumferential direction, and the fixing ring is provided with a plurality of second magnets in the corresponding circumferential direction; the first magnets and the second magnets are arranged alternately, and there is a gap between adjacent first magnets and second magnets. The alternately arranged first magnets and second magnets make the force resisting the rotation of the torsion shaft more uniform, thereby improving the vibration reduction effect.

[0008] Further: the distance between the torsion shaft and the fixing ring is adjustable. By adjusting the distance between the torsion shaft and the fixing ring, the relative magnetic field area between the first magnet and the second magnet can be adjusted. When the magnetic fields of the first magnet and the second magnet are completely opposite, the damping force provided is the largest; when the magnetic fields of the first magnet and the second magnet are completely separated, no damping force is generated. That is, by adjusting the distance between the torsion shaft and the fixing ring, the damping force of the shock absorber can be conveniently adjusted.

[0009] Preferably: a second damping device is connected to the torsion shaft, and the second damping device includes an electromagnetic coil and a corresponding third magnet that form a loop; the electromagnetic coil and the third magnet move relative to each other, cutting the magnetic lines of force to generate current, and simultaneously generating a reverse magnetic field to form a damping force that prevents relative movement. The provision of the second damping device can further increase the damping force and improve the vibration reduction effect. The faster the torsion shaft rotates, the faster the electromagnetic coil cuts the magnetic lines of force of the third magnet, the greater the current generated, and the greater the reverse magnetic field generated, the greater the damping force. The electromagnetic damping device has the advantages of fast response speed and good vibration reduction effect.

[0010] Preferably: a diode is connected in series on the electromagnetic coil circuit. The diode is used to ensure that the electromagnetic coil circuit can only be unidirectionally conductive, that is, the electromagnetic coil can only form a current loop and generate a reverse magnetic field to achieve a damping and vibration reduction effect when it moves relative to the third magnet in one direction. When the electromagnetic coil moves relative to the opposite direction, a current loop cannot be formed, a reverse magnetic field cannot be generated, and there is no damping effect. The unidirectional damping effect is achieved by connecting diodes in series. The second damping device and the first damping device cooperate with each other to enable the shock absorber to provide different damping forces in the two rotation directions of the torsion shaft to be suitable for different application scenarios.

[0011] Preferably, a rechargeable battery is arranged in the electromagnetic coil loop. The rechargeable battery in the electromagnetic coil loop can realize unidirectional damping of the electromagnetic coil while generating a unidirectional pulse current to charge the battery, so that energy can be recovered, thereby achieving energy-saving and environmental protection effects.

[0012] Preferably, a variable resistor is connected in series to the electromagnetic coil loop. By adjusting the resistance of the variable resistor, the magnitude of the current in the electromagnetic coil loop can be adjusted, thereby adjusting the magnitude of the reverse magnetic field, and conveniently adjusting the magnitude of the damping force of the second damping device of the shock absorber.

[0013] One way: the electromagnetic coil is arranged on the torsion shaft, and the third magnet is arranged at the outer circumference of the electromagnetic coil. The rotation of the torsion shaft drives the electromagnetic coil to cut the magnetic lines of the third magnet, generating current and reverse magnetic field, which has a damping and vibration reduction effect.

[0014] Another way: the third magnet is arranged on the torsion shaft in a plane, and the electromagnetic coil is a flat coil arranged close to the third magnet. The electromagnetic coil is fixed, and the third magnet rotates with the torsion shaft, which can also play a damping and vibration reduction effect.

[0015] The utility model utilizes the property that magnets of the same polarity repel each other, and sets magnets of the same polarity opposite to each other as a damping device, thereby providing a damping force opposite to the rotation direction of the torsion shaft, thereby achieving a vibration reduction effect. In addition, by setting a set of electromagnetic damping devices, when the torsion shaft rotates, the electromagnetic coil and the magnet move relative to each other, cutting the magnetic lines of force to generate current, and at the same time generating a reverse magnetic field, forming a damping force to prevent relative movement, thereby achieving a vibration reduction effect. The utility model has a simple structure, fast response speed, good damping effect, and convenient damping force adjustment, and is suitable for various automobiles, electric vehicles, bicycles, and other occasions requiring torsional vibration reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of a combination of the utility model.

[0017] FIG. 2 is a schematic diagram of an exploded view of a form of the utility model.

[0018] FIG. 3 is a schematic diagram of another exploded view of the utility model.

[0019] Among them, 1. Torque shaft; 2. First magnet; 3. Second magnet; 4. Fixed ring; 5. Electromagnetic coil; 6. Third magnet; 7. Rechargeable battery; 8. Variable resistor; 9. Diode. DETAILED DESCRIPTION

[0020] like Figure 1-3 As shown, a torsional vibration damper includes a torsion shaft 1, and a plurality of first magnets 2 are evenly arranged in the circumferential direction of the torsion shaft 1. A fixing ring 4 is coaxially arranged on one side of the torsion shaft 1, and a plurality of second magnets 3 are correspondingly arranged in the circumferential direction inside the fixing ring 4. The first magnets 2 and the second magnets 3 are arranged alternately, and there is a gap between adjacent first magnets 2 and second magnets 3, and the polarity of the magnetic surfaces opposite to each other of adjacent first magnets 2 and second magnets 3 is the same.

[0021] When the torsion shaft 1 is rotated by force, the first magnet 2 connected to the torsion shaft 1 rotates synchronously, and the distance between the first magnet 2 and the second magnet 3 is close. Since the polarity of the relative magnetic surfaces of the first magnet 2 and the second magnet 3 is the same, a force opposite to the rotation direction of the torsion shaft 1 will be generated between the first magnet 2 and the second magnet 3 to resist the rotation of the torsion shaft 1, thereby achieving a vibration reduction effect. Regardless of whether the torsion shaft 1 is rotating forward or reverse, the magnetic damping device can provide the same damping force and achieve the same vibration reduction effect.

[0022] By adjusting the distance between the torsion shaft 1 and the fixing ring 4, the magnetic field area of ​​the corresponding magnetic surface between the first magnet 2 and the second magnet 3 can be adjusted. When the magnetic fields of the first magnet 2 and the second magnet 3 are completely opposite, the damping force provided is the largest; when the magnetic fields of the first magnet 2 and the second magnet 3 are completely separated, no damping force is generated. That is, by adjusting the distance between the torsion shaft 1 and the fixing ring 4, the damping force of the shock absorber can be conveniently adjusted.

[0023] like Figure 1 , 2 As shown, in one form, an electromagnetic coil 5 is arranged on the torsion shaft 1, a fixed ring is arranged on the outer circumference of the electromagnetic coil 5, and a third magnet 6 is arranged inside the fixed ring. A diode 9 and a variable resistor 8 are connected in series in the circuit of the electromagnetic coil 5, and a rechargeable battery 7 is also arranged in the circuit of the electromagnetic coil 5.

[0024] The rotation of the torsion shaft 1 drives the electromagnetic coil 5 to cut the magnetic lines of force of the third magnet 6, generating current and reverse magnetic field, which has a damping and vibration reduction effect. The setting of the diode 9 realizes that the circuit of the electromagnetic coil 5 can only be unidirectionally conductive, that is, the electromagnetic coil 5 can only form a current loop and generate a reverse magnetic field when it moves relative to the third magnet 6 in one direction, which has a damping and vibration reduction effect. When the electromagnetic coil 5 moves relative to the opposite direction, it cannot form a current loop, cannot generate a reverse magnetic field, and has no damping effect. The unidirectional damping effect is achieved by connecting the diode 9 in series.

[0025] The variable resistor 8 on the circuit of the electromagnetic coil 5 can adjust the magnitude of the current in the circuit of the electromagnetic coil 5, thereby adjusting the magnitude of the reverse magnetic field, and conveniently adjusting the magnitude of the damping force of the second damping device of the shock absorber.

[0026] The rechargeable battery 7 in the circuit of the electromagnetic coil 5 can realize unidirectional damping of the electromagnetic coil 5 while generating a unidirectional pulse current to charge the rechargeable battery 7, so that energy can be recovered, thereby achieving the effect of energy saving and environmental protection.

[0027] like Figure 3As shown, in another form, the third magnet 6 is arranged on the torsion shaft 1 in a plane, and the electromagnetic coil 5 is a flat coil, which is arranged close to the third magnet 6. A diode 9 and a variable resistor 8 are connected in series in the circuit of the electromagnetic coil 5, and a rechargeable battery 7 is also arranged in the circuit of the electromagnetic coil 5. The electromagnetic coil 5 is fixed, and the third magnet 6 rotates with the torsion shaft 1, which can also play a damping and vibration reduction effect.

[0028] In addition, the speed conversion mechanism can also be used to enlarge or reduce the angle and angular velocity variable of the torque shaft rotation.

[0029] The magnetic damping device and the electromagnetic damping device of the utility model cooperate with each other, so that the shock absorber can provide different damping forces in the two rotation directions of the torsion shaft 1, so as to be suitable for different application scenarios. The utility model has a simple structure, fast response speed, good damping effect, and convenient damping force adjustment, and is suitable for various automobiles, electric vehicles, bicycles, and other occasions requiring torsional vibration reduction.

Claims

1. A torsional vibration damper, comprising a torsion shaft, and a first damping device for applying a force in a direction opposite to the relative rotation direction of the torsion shaft, characterized in that: The first damping device is at least one first magnet connected to the torsion shaft, and at least one second magnet arranged on the movement track of the first magnet; the relative positions of the first magnet and the second magnet have the same polarity.

2. The torsional vibration damper according to claim 1, characterized in that: The first magnet is coaxially arranged on the torsion shaft, and the second magnet is arranged in a fixing ring and coaxially arranged with the torsion shaft.

3. The torsional vibration damper according to claim 2, characterized in that: The torsion shaft is evenly provided with a plurality of first magnets in the circumferential direction, and the fixing ring is provided with a plurality of second magnets in the corresponding circumferential direction; the first magnets and the second magnets are arranged alternately, and there is a gap between adjacent first magnets and the second magnets.

4. The torsional vibration damper according to claim 2 or 3, characterized in that: The distance between the torsion shaft and the fixing ring is adjustable.

5. The torsional vibration damper according to any one of claims 1 to 3, characterized in that: The torsion shaft is connected with a second damping device, which includes an electromagnetic coil and a corresponding third magnet forming a loop; the electromagnetic coil and the third magnet move relative to each other, cutting the magnetic lines of force to generate current, and simultaneously generating a reverse magnetic field to form a damping force to prevent relative movement.

6. The torsional vibration damper according to claim 5, characterized in that: A diode is connected in series on the electromagnetic coil loop.

7. The torsional vibration damper according to claim 6, characterized in that: A rechargeable battery is arranged in the electromagnetic coil loop.

8. The torsional vibration damper according to claim 7, characterized in that: A variable resistor is connected in series to the electromagnetic coil loop.

9. The torsional vibration damper according to claim 5, characterized in that: The electromagnetic coil is arranged on the torsion shaft, and the third magnet is arranged at an outer circumferential position of the electromagnetic coil.

10. The torsional vibration damper according to claim 5, characterized in that: The third magnet is arranged in a plane on the torsion shaft, and the electromagnetic coil is a flat coil arranged close to the third magnet.

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