Torque limiter, range extender and vehicle

Abstract

The utility model discloses a torque limiter, range extender and vehicle, the torque limiter comprises a pressure plate and a plate hub connected with the pressure plate in torsion resistance, also comprises: a first damping fin and a second damping fin, the first damping fin and the second damping fin are respectively located at two opposite sides of the axial direction of the plate hub, the first damping fin and the second damping fin abut against the disc hub, each of the first damping fin and the second damping fin comprises a plurality of inner protruding parts and a plurality of outer protruding parts, the inner protruding parts and the outer protruding parts are sequentially arranged in a staggered mode, the inner protruding parts protrude and extend towards the disc hub, and the outer protruding parts protrude and extend away from the disc hub. Compared with the prior art, the damping fins (the first damping fin and the second damping fin) in the torque limiter are arranged to be of the structure with the convex parts and the concave parts, so that the contact area between the damping fins and the disc hub is reduced, the damping fins can better absorb energy generated when the rotating speed and the torque of the disc hub fluctuate, and low-frequency noise is reduced.

Description

Technical Field

[0001] The utility model relates to a torque limiter, in particular to a torque limiter, a range extender and a vehicle. Background Art

[0002] With the popularization and application of electric vehicles and generator sets, the noise problem during their operation has gradually attracted people's attention. As one of the core components of this type of equipment, the noise generated by the range extender directly affects the user experience. At present, the range extender usually uses a torque limiter to transmit torque and limit excessive torque to protect the motor shaft from damage. However, in the prior art, the torque limiter sometimes generates low-frequency noise. This low-frequency noise not only affects the user experience, but may also have an adverse effect on the long-term operating stability of the equipment. Utility Model Content

[0003] The utility model aims to provide a torque limiter, a range extender and a vehicle to solve the technical problems in the prior art, and can reduce the generation of low-frequency noise.

[0004] The utility model provides a torque limiter, comprising a pressure plate and a disc hub connected to the pressure plate in a torsion-resistant manner, and further comprising:

[0005] A first damping plate and a second damping plate, wherein the first damping plate and the second damping plate are respectively located on opposite sides of the axial direction of the disk hub, and both the first damping plate and the second damping plate are abutted against the disk hub, and both the first damping plate and the second damping plate include a plurality of inner protrusions and a plurality of outer protrusions, and the plurality of inner protrusions and the plurality of outer protrusions are alternately arranged in sequence, the inner protrusions protrude and extend toward the disk hub, and the outer protrusions protrude and extend away from the disk hub.

[0006] In the torque limiter as described above, preferably, the end faces of the inner protrusion and the outer protrusion are both arc surfaces, and the inner protrusion and the outer protrusion are connected by a curved surface.

[0007] In the torque limiter as described above, preferably, the end faces of the inner protrusion and the outer protrusion are both planes, and the inner protrusion and the outer protrusion are connected by an inclined surface.

[0008] In the torque limiter as described above, preferably, in the axial direction of the hub, a distance between the end surface of the inner protrusion and the end surface of the outer protrusion is 3 mm.

[0009] In the torque limiter as described above, preferably, both the first damping plate and the second damping plate are made of PA66+GF30 material.

[0010] A torque limiter as described above, wherein preferably, a first disc spring, a first pressure plate and a friction plate are arranged between the pressure plate and the disc hub, the pressure plate, the first disc spring, the first pressure plate, the friction plate and the disc hub are coaxially fitted in sequence, a second pressure plate and a second disc spring are arranged on the side of the disc hub away from the pressure plate, and the disc hub, the second damping plate, the second pressure plate and the second disc spring are coaxially fitted in sequence.

[0011] A torque limiter as described above, wherein preferably, the second disc spring has a thickness of 1 mm and a diameter of 100 mm.

[0012] In the torque limiter as described above, preferably, the second disc spring is made of 65Mn steel.

[0013] In a second aspect, the utility model further provides a range extender, comprising the aforementioned torque limiter.

[0014] In a third aspect, the utility model also provides a vehicle, comprising the aforementioned range extender.

[0015] Compared with the prior art, the utility model reduces the contact area between the damping plate and the disk hub by setting the damping plate (the first damping plate and the second damping plate) in the torque limiter to a structure with convex parts and concave parts, thereby reducing the friction between the damping plate and the disk hub, so that the damping plate can better absorb the energy when the disk hub speed torque fluctuates, thereby reducing the generation of low-frequency noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a torque limiter provided in an embodiment of the utility model;

[0017] Figure 2 The diagram is a partial structural diagram of a first damping plate or a second damping plate in one embodiment.

[0018] Description of reference numerals:

[0019] 1-pressure plate, 2-disc hub, 3-first damping plate, 4-second damping plate, 5-inner protrusion, 6-outer protrusion, 7-first disc spring, 8-first pressure plate, 9-friction plate, 10-second pressure plate, 11-second disc spring. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0021] First, as Figure 1 As shown, an embodiment of the utility model provides a torque limiter, the function of the torque limiter is to transmit engine torque, reduce engine speed fluctuations and limit excessive torque to protect the motor input shaft from damage, which includes a pressure plate 1 and a disc hub 2 connected to the pressure plate 1 in a torsion-resistant manner, the pressure plate 1 is connected to the crankshaft of the engine, and the disc hub 2 is connected to the motor input shaft of the generator, the torsion-resistant connection is that when the torque of the engine is below a preset threshold, the disc hub 2 receives the power transmitted by the pressure plate 1, and when the torque of the engine exceeds the preset threshold, the power transmission between the pressure plate 1 and the disc hub 2 is disconnected to protect the power system, the disc hub 2 will have speed and torque fluctuations when rotating, in the embodiment provided by the utility model, the energy of the speed and torque fluctuations of the disc hub 2 is absorbed by the damping plate to reduce the transmission of vibration and noise, the damping plate includes a first damping plate 3 and a second damping plate 4, wherein:

[0022] The first damping plate 3 and the second damping plate 4 are respectively located on opposite sides of the axial direction of the disc hub 2. The first damping plate 3 and the second damping plate 4 are both in contact with the disc hub 2. By means of the friction between the first damping plate 3 and the second damping plate 4 and the disc hub 2, the vibration generated by the car is consumed and the vibration is rapidly attenuated.

[0023] The first damping plate 3 and the second damping plate 4 are not conventional planar sheet structures. In a feasible implementation, the first damping plate 3 and the second damping plate 4 are both annular plate structures, including multiple inner protrusions 5 and multiple outer protrusions 6 along the disk hub 2, and the multiple inner protrusions 5 and the multiple outer protrusions 6 are alternately arranged in sequence. The inner protrusions 5 protrude and extend toward the disk hub 2, and the outer protrusions 6 protrude and extend away from the disk hub 2. The structure of the inner protrusions 5 and the structure of the outer protrusions 6 may be the same or different, and are not limited here.

[0024] By setting the damping plate (the first damping plate 3 and the second damping plate 4) in the torque limiter to a structure with convex and concave portions, the contact area between the damping plate and the disk hub 2 is reduced, thereby reducing the friction between the damping plate and the disk hub 2, so that the damping plate can better absorb the energy when the speed torque of the disk hub 2 fluctuates, thereby reducing the generation of low-frequency noise.

[0025] In the embodiments provided by the present utility model, refer to Figure 1As shown, a first disc spring 7, a first pressure plate 8 and a friction plate 9 are arranged between the pressure plate 1 and the disc hub 2. The pressure plate 1, the first disc spring 7, the first pressure plate 8, the friction plate 9 and the disc hub 2 are coaxially fitted in sequence. The pressure plate 1 is connected to the engine crankshaft. The first disc spring 7 applies pressure to the first pressure plate 8 to squeeze the friction plate 9 in the axial direction of the torque limiter. The axial pressure generated by the first disc spring 7 presses the pressure plate, and the pressure plate then presses the friction plate 9. The friction plate 9 presses the disc hub pressure plate of the disc hub 2, driving the disc hub 2 to rotate. The inner spline of the disc hub 2 is connected to the outer spline of the motor input shaft, and the disc hub 2 drives the motor input shaft to rotate, and then the generator generates electricity. The first damping plate 3 is located between the friction plate 9 and the disc hub 2. When the transmitted torque is too large, the friction plate 9 and the disc hub 2 slip, and the disc hub 2 will not transmit the torque to the motor input shaft, thereby limiting the torque and protecting the motor shaft.

[0026] A second pressure plate 10 and a second disc spring 11 are arranged on the side of the disc hub 2 facing away from the pressure plate 1. The disc hub 2, the second damping plate 4, the second pressure plate 10 and the second disc spring 11 are coaxially arranged in sequence. When the disc hub 2 rotates, there will be fluctuations in speed and torque. The second disc spring 11 provides axial force to press the second pressure plate 10. The second pressure plate 10 presses the second damping plate 4. The second damping plate 4 presses the disc hub 2. The energy of the speed and torque fluctuations of the disc hub 2 is absorbed by the second damping plate 4 to reduce the transmission of vibration and noise.

[0027] When the number of inner protrusions 5 and outer protrusions 6 is changed, the magnitude of the friction force applied by the first damping plate 3 and the second damping plate 4 on the hub 2 can be adjusted: when the number of inner protrusions 5 and outer protrusions 6 is more, the contact area between the first damping plate 3 and the second damping plate 4 and the hub 2 is larger, so that the friction force is larger; when the number of inner protrusions 5 and the outer protrusions 6 is smaller, the friction force is smaller. It is necessary to limit the number of inner protrusions 5 and the outer protrusions 6 to a reasonable range, so that the friction force between the damping plate and the hub 2 can meet the requirements of effectively absorbing the energy of the rotation speed torque fluctuation of the hub 2 while reducing the generation of low-frequency noise. Preferably, there are four inner protrusions 5 and four outer protrusions 6, and the four inner protrusions 5 and the four outer protrusions 6 are distributed in a ring shape with equal intervals.

[0028] In a feasible implementation manner, the first damping sheet 3 and the second damping sheet 4 are both wavy structures. Figure 2 As shown, the end faces of the inner protrusion 5 and the outer protrusion 6 are both arc surfaces, and the inner protrusion 5 and the outer protrusion 6 are connected by a curved surface. In the initial state, the inner protrusion 5 and the disk hub 2 are abutted against each other through the arc surface, exerting a smaller friction force on the disk hub 2. When the first damping plate 3 or the second damping plate 4 is subjected to a larger pressure, the first damping plate 3 and the second damping plate 4 are deformed, increasing the contact area with the disk hub 2 and reducing the pressure at the contact point, thereby adjusting the friction force with the disk hub 2.

[0029] In another feasible implementation manner, the end faces of the inner protrusion 5 and the outer protrusion 6 are both planes, and the inner protrusion 5 and the outer protrusion 6 are connected by an inclined surface. The inner protrusion 5 and the outer protrusion 6 are both trapezoidal structures. Compared with the inner protrusion 5 with an arc-shaped structure, the friction between the inner protrusion 5 with a trapezoidal structure and the disk hub 2 is relatively greater. After being compressed, the inner protrusion 5 is not easy to deform and has stronger stability.

[0030] When the thickness of the first damping plate 3 and the second damping plate 4 is changed, the friction force between the damping plate and the hub 2 can be adjusted: when the distance between the end face of the inner protrusion 5 and the end face of the outer protrusion 6 is larger, the first damping plate 3 and the second damping plate 4 have a greater elastic deformation capacity, which can make the friction force greater; when the distance between the end face of the inner protrusion 5 and the end face of the outer protrusion 6 is smaller, the first damping plate 3 and the second damping plate 4 have a smaller elastic deformation capacity, which can make the friction force greater.

[0031] In the embodiment provided by the utility model, in order to further reduce the friction between the damping plate and the disk hub 2, a design scheme of a damping plate with a smaller thickness is adopted. Specifically, in the axial direction of the disk hub 2, the distance between the end face of the inner protrusion 5 and the end face of the outer protrusion 6 is 3 mm, that is, the thickness of the damping plate is 3 mm. Under this thickness condition, the first damping plate 3 and the second damping plate 4 have a smaller elastic deformation capacity. While reducing the friction, it does not affect the damping plate's ability to absorb the speed torque fluctuation energy of the disk hub 2. Those skilled in the art can know that this thickness can be adaptively changed according to actual needs and is not limited here.

[0032] Furthermore, the first damping plate 3 and the second damping plate 4 are both made of materials with a lower friction coefficient. In a feasible implementation, the first damping plate 3 and the second damping plate 4 are both made of PA66+GF30 material, which has good wear resistance and self-lubrication, and can reduce friction while maintaining a longer service life.

[0033] At the same time, the axial pressure exerted on the second damping plate 4 can be reduced by optimizing the thickness and material of the second disc spring 11. Specifically, by reducing the thickness of the second disc spring 11 and reducing its stiffness, the axial pressure generated is reduced, thereby reducing the friction between the second damping plate 4 and the hub 2. Preferably, the second disc spring 11 has a thickness of 1 mm and a diameter of 100 mm. Those skilled in the art will appreciate that the thickness of the second disc spring 11 can be adjusted according to actual needs, and this is not limited here.

[0034] Preferably, the second disc spring 11 is made of 65Mn steel. A material with a lower elastic modulus is selected to make the second disc spring 11 to reduce its stiffness and the axial pressure generated, thereby reducing the friction between the second damping plate 4 and the disc hub 2.

[0035] Based on the torque limiter provided in the above embodiments, the generation of low-frequency noise can be reduced to a good extent. The reduction of low-frequency noise will significantly improve the riding comfort of the electric vehicle, so that passengers can enjoy a quieter and more comfortable driving experience during driving. At the same time, the reduction of low-frequency noise also means that damage to other parts of the vehicle is reduced, thereby extending the service life of the equipment. The torque limiter provided by the utility model has a simple structure and is easy to implement. There is no need to make large-scale changes to the range extender, and the cost is low.

[0036] On the second aspect, the utility model also provides a range extender, which includes an engine, a generator and the aforementioned torque limiter. The engine and the generator are connected through the torque limiter to drive the generator to generate electricity. The electricity generated by the generator is directly provided to the motor, and the excess electricity can be provided to the battery for charging, so as to drive the vehicle to move through the motor.

[0037] In a third aspect, the utility model also provides a vehicle, comprising the aforementioned range extender.

[0038] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. A torque limiter, characterized in that: It includes a pressure plate and a disc hub connected to the pressure plate in a torsion-resistant manner, and also includes: A first damping plate and a second damping plate, wherein the first damping plate and the second damping plate are respectively located on opposite sides of the axial direction of the disk hub, and both the first damping plate and the second damping plate are abutted against the disk hub, and both the first damping plate and the second damping plate include a plurality of inner protrusions and a plurality of outer protrusions, and the plurality of inner protrusions and the plurality of outer protrusions are alternately arranged in sequence, the inner protrusions protrude and extend toward the disk hub, and the outer protrusions protrude and extend away from the disk hub.

2. The torque limiter according to claim 1, characterized in that: The end surfaces of the inner protrusion and the outer protrusion are both arc surfaces, and the inner protrusion and the outer protrusion are connected by a curved surface.

3. The torque limiter according to claim 1, characterized in that: The end surfaces of the inner protrusion and the outer protrusion are both planes, and the inner protrusion and the outer protrusion are connected by an inclined surface.

4. The torque limiter according to claim 1, characterized in that: In the axial direction of the hub, the distance between the end surface of the inner protrusion and the end surface of the outer protrusion is 3 mm.

5. The torque limiter according to claim 1, characterized in that: The first damping plate and the second damping plate are both made of PA66+GF30 material.

6. The torque limiter according to claim 1, characterized in that: A first disc spring, a first pressure plate and a friction plate are arranged between the pressure plate and the disc hub, and the pressure plate, the first disc spring, the first pressure plate, the friction plate and the disc hub are coaxially fitted in sequence, and a second pressure plate and a second disc spring are arranged on the side of the disc hub away from the pressure plate, and the disc hub, the second damping plate, the second pressure plate and the second disc spring are coaxially fitted in sequence.

7. The torque limiter according to claim 6, characterized in that: The second disc spring has a thickness of 1 mm and a diameter of 100 mm.

8. The torque limiter according to claim 6, characterized in that: The second disc spring is made of 65Mn steel.

9. A range extender, comprising the torque limiter according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Including the range extender as described in claim 9.

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