Torsion limiting damper and power transmission device

Abstract

The torsion limiting shock absorber comprises a flywheel, a disc spring, a transmission disc, a shock absorption device and a rear cover, the flywheel is connected to the rear cover, and a U-shaped annular groove with an opening facing the rotating axis direction can be formed between the flywheel and the rear cover; the disc spring, the driving disc and the damping device are connected in sequence, and the disc spring can provide elastic force for elastically extruding the driving disc and the damping device on the radial side wall of the U-shaped ring groove; the two sides of the damping device are connected with the radial side wall of the U-shaped annular groove through friction structures correspondingly. A first torque transmission part and a second torque transmission part are arranged on the rotating axis of the transmission disc and the rotating axis of the damping device correspondingly. According to the torsion-limiting shock absorber, the sequence of all components in the torsion-limiting shock absorber in the prior art is adjusted, and the disc spring applies elastic extrusion force to the shock absorber through the transmission disc, so that a pressing plate structure in the prior art is omitted, the number of parts of a product is reduced, and meanwhile, the material cost and the assembly cost are reduced.

Description

Technical Field

[0001] The utility model relates to a torsion-limiting vibration damper and a power transmission device, belonging to the technical field of torsion-limiting vibration dampers. Background Art

[0002] In automotive applications, torque limiters are used to transfer engine torque to the transmission or wheels. They typically perform at least two functions: first, limiting torque through friction to prevent engine overload; and second, mitigating engine torque output through springs configured in the direction of rotation.

[0003] Publication number CN218480104 U discloses a torque-limiting vibration damper flywheel structure, which records that an annular spring applies pressure to the friction plate of the shock absorber assembly through a shock-absorbing pressure plate; furthermore, the patent with publication number CN217440636U also records that an elastic member provides pressure to the friction member through a separation ring. Due to the structure of the disc spring (the above-mentioned annular spring, elastic member), when it applies pressure to the friction member, the contact area with the friction member is very small, almost a line contact. Therefore, in order to protect the friction member, it is necessary to isolate the friction member and the disc spring through a pressure plate or pressure plate with an annular structure, thereby achieving protection of the friction member and ensuring the constancy of the overload torque. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a torque limiting vibration damper and a power transmission device, which solve the technical problems of the prior art that the torque limiting vibration damper has too many parts and relatively high cost.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] The torsion damper includes a flywheel, a disc spring, a transmission plate, a vibration damping device and a rear cover. The flywheel is connected to the rear cover, and a U-shaped annular groove with an opening facing the rotation axis can be formed between the two.

[0007] The disc spring, the transmission disc, and the vibration damping device are connected in sequence, and the disc spring can provide an elastic force to elastically squeeze the transmission disc and the vibration damping device onto the radial side wall of the U-shaped ring groove;

[0008] Both sides of the vibration damping device are connected to the radial side walls of the U-shaped ring groove through friction structures;

[0009] The driving plate and the rotation axis of the vibration damping device are respectively provided with a first torque transmission part and a second torque transmission part.

[0010] Preferably, a flywheel annular groove is provided on the connecting surface of the rear cover of the flywheel, and the flywheel annular groove and the rear cover constitute two radial side walls of the U-shaped annular groove.

[0011] Furthermore, the rear cover includes a flywheel connecting portion located on the outer edge and a vibration damping device connecting portion located on the inner edge, and the vibration damping device connecting portion extends in a direction away from the flywheel relative to the flywheel connecting portion; the vibration damping device connecting portion matches the position and radial dimensions of the flywheel ring groove; the flywheel ring groove and the vibration damping device connecting portion constitute two radial side walls of the U-shaped ring groove.

[0012] The disc spring is preferably connected to the flywheel, and the vibration damping device is connected to the rear cover.

[0013] As a preferred structure, a plurality of threaded holes and positioning holes are provided on the side of the flywheel. The flywheel connecting part is connected to the threaded holes and positioning holes respectively by bolts and positioning pins. The positioning pins ensure the connection accuracy between the flywheel and the rear cover.

[0014] In order to ensure that the transmission disc and the flywheel bracket do not rotate, the rotatable friction pairs of the torque limiting vibration damper are respectively located on both sides of the vibration damping device 4, and a locking structure is provided between the transmission disc and the flywheel or rear cover 5 to prevent the two from rotating relative to each other.

[0015] Preferably, the locking structure is specifically that a positioning protrusion is provided on the outer edge of the transmission disc, and the flywheel cooperates with the positioning protrusion through a positioning groove.

[0016] Preferably, the outer edge of the disc spring contacts the flywheel, and the inner edge of the disc spring contacts the transmission disc.

[0017] As another embodiment, the disc spring is connected to the rear cover, and the vibration damping device is connected to the flywheel.

[0018] A power transmission device includes any one of the aforementioned torque limiting vibration dampers, wherein the first torque transmission part is connected to the power input end, and the second torque transmission part is connected to the power output end.

[0019] Beneficial effects achieved by the utility model:

[0020] The utility model adjusts the order of the various components in the torsion limiting vibration damper in the prior art and allows the disc spring to act directly on the transmission plate, thus eliminating the pressure plate structure in the prior art, reducing the number of parts in the product, and also reducing material and assembly costs.

[0021] Since the disc spring applies elastic extrusion force to the vibration damping device through the transmission plate, the transmission plate plays the role of isolating the disc spring and the friction plate, ensuring the normal operation of the friction plate and the normal use of the torque limiting vibration damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of the torque limiting vibration damper of the utility model;

[0023] Figure 2 It is a cross-sectional view of the torque limiting vibration damper of the utility model;

[0024] Figure 3 yes Figure 2 A partial enlarged view of the middle figure;

[0025] Figure 4 This is a cross-sectional view of the U-shaped ring groove of the utility model;

[0026] The meanings of the reference numerals in the figure are: 1-flywheel; 2-disc spring; 3-transmission plate; 4-vibration damping device; 5-rear cover; 6-washer plate; 7-U-shaped ring groove; 11-flywheel ring groove; 12-positioning groove; 13-threaded hole; 14-positioning hole; 31-positioning protrusion; 32-torque transmission part 1; 41-torque transmission part 2; 51-flywheel connecting part; 52-vibration damping device connecting part. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] like Figures 1 to 4 As shown: This embodiment discloses a torque limiting vibration damper, including a flywheel 1, a disc spring 2, a transmission plate 3, a vibration damping device 4 and a rear cover 5. The flywheel 1 is connected to the rear cover 5, and a U-shaped annular groove 7 with an opening facing the direction of the rotation axis can be formed between the two. Figure 4 The arrow in the figure indicates the opening direction of the U-shaped ring groove 7, and the dashed line indicates the rotation axis of the torque limiting vibration damper. The vibration damping device 4 is conventional, with friction plates on both sides of its outer edge. Several damping springs are provided in the direction of rotation to cushion the impact of the torque limiting vibration damper in this direction of rotation.

[0029] The disc spring 2, the transmission disc 3, and the vibration damping device 4 are connected in sequence, and the disc spring 2 can provide a method for elastically squeezing the transmission disc 3 and the vibration damping device 4 onto the radial side wall of the U-shaped ring groove 7 (using Figure 4 This elastic force can generate a certain friction force between the vibration damping device 4 and the U-shaped ring groove 7, and this friction force is used to limit the maximum torque of the torque limiting vibration damper in the power system.

[0030] The rotational axes of the transmission plate 3 and the vibration damper 4 are respectively provided with a torque transmission component 1 32 and a torque transmission component 2 41. In practice, the torque transmission component 1 32 is typically a peripheral flange hole, typically connected to the engine crankshaft; the torque transmission component 2 41 is typically an internal spline hole for connection to the transmission case. A washer 6 is also provided on the vibration damper side of the torque transmission component 1 32. The washer 6 acts as a gasket, used in conjunction with the bolts of the torque transmission component 1 32.

[0031] Preferably, a flywheel annular groove 11 is provided on the rear cover connecting surface of the flywheel 1 , and the flywheel annular groove 11 and the rear cover 5 constitute two radial side walls of the U-shaped annular groove 7 .

[0032] Furthermore, the rear cover 5 can be further optimized. The rear cover 5 includes a flywheel connection portion 51 located on the outer edge and a vibration damper connection portion 52 located on the inner edge. The vibration damper connection portion 52 extends away from the flywheel 1 relative to the flywheel connection portion 51. The vibration damper connection portion 52 matches the position and radial dimensions of the flywheel annular groove 11. In other words, the radial dimensions of the vibration damper connection portion 52 are approximately equal to the radial dimensions of the flywheel annular groove 11. It is preferable that the flywheel connection portion 51 and the vibration damper connection portion 52 adopt an integrated stamped structure, which can reduce costs and improve the strength of the entire rear cover 5.

[0033] The flywheel annular groove 11 and the vibration damping device connecting portion 52 form two radial side walls of the U-shaped annular groove 7. In this embodiment, the disc spring 2 needs to directly apply pressure to the vibration damping device through the transmission plate 3. However, there are two possible installation methods for the disc spring 2, transmission plate 3, and vibration damping device 4:

[0034] Installation method 1: The disc spring 2 is located on one side of the flywheel 1, that is, the disc spring 2 is connected to the flywheel 1, and the vibration damping device 4 is connected to the rear cover 5. In this state, the outer edge of the disc spring 2 is in contact with the flywheel 1, and the inner edge of the disc spring 2 is in contact with the transmission plate 3, which is the illustrated method in this embodiment.

[0035] Installation method 2: The disc spring 2 is located on one side of the rear cover 5, that is, the disc spring 2 is connected to the rear cover 5, and the vibration damping device 4 is connected to the flywheel 1. This installation method is not shown in the figure.

[0036] A plurality of threaded holes 13 and positioning holes 14 are provided on the side of the flywheel 1 , and the flywheel connecting portion 51 is connected to the threaded holes 13 and the positioning holes 14 respectively through bolts and positioning pins.

[0037] Since the flywheel 1 or the rear cover 5 are connected together by bolts, the transmission disc 3 only needs to prevent rotation with one of them. In order to prevent rotation between the transmission disc 3 and the flywheel 1 or the rear cover 5, a locking structure is provided between the two to prevent relative rotation between the two. The locking structure of this embodiment is specifically as follows: a positioning protrusion 31 is provided on the outer edge of the transmission disc 3, and the flywheel 1 cooperates with the positioning protrusion 31 through a positioning groove 12. Of course, the locking structure can also adopt other structures in the prior art, such as the form of a positioning pin. The existence of the locking structure prevents relative rotation between the flywheel 1, the rear cover 5 and the transmission disc 3, so the only parts that can rotate are the two sides of the vibration damping device 4.

[0038] With the aforementioned installation method 1, the two sides of the vibration damper 4 form friction pairs with the transmission plate 3 and the rear cover 5, respectively. With the installation method 2, the two sides of the vibration damper 4 form friction pairs with the transmission plate 3 and the flywheel 1, respectively. Regardless of which installation method is used, the vibration damper 4 will not directly contact the disc spring when overload slip occurs, ensuring the normal operation of the friction plate.

[0039] Compared with the prior art, this embodiment adjusts the order of the various components in the torque limiting vibration damper in the prior art and directly acts on the disc spring 2 on the transmission plate 3. This eliminates the pressure plate structure in the prior art, reduces the number of parts in the product, and also reduces material and assembly costs.

[0040] With the structure of this embodiment, since the disc spring 2 applies elastic extrusion force to the vibration damping device 4 through the transmission plate 3, the transmission plate 3 serves to isolate the disc spring 2 and the friction plate, ensuring the normal operation of the friction plate and the normal use of the torque limiting vibration damper.

[0041] This embodiment further discloses a power transmission device, including the aforementioned torque limiting vibration damper of this embodiment, wherein the first torque transmission part 32 is connected to the power input end, and the second torque transmission part 41 is connected to the power output end.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Torque limiting vibration damper, characterized in that: It comprises a flywheel (1), a disc spring (2), a transmission disc (3), a vibration damping device (4) and a rear cover (5), wherein the flywheel (1) is connected to the rear cover (5), and a U-shaped annular groove (7) with an opening facing the direction of the rotation axis can be formed between the flywheel (1); The disc spring (2), the transmission disc (3), and the vibration damping device (4) are connected in sequence, and the disc spring (2) can provide an elastic force for elastically pressing the transmission disc (3) and the vibration damping device (4) against the radial side wall of the U-shaped annular groove (7); Both sides of the vibration damping device (4) are respectively connected to the radial side walls of the U-shaped annular groove (7) via friction structures; The rotation axes of the transmission disc (3) and the vibration damping device (4) are respectively provided with a torque transmission part 1 (32) and a torque transmission part 2 (41).

2. The torque limiting vibration damper according to claim 1, characterized in that: A flywheel annular groove (11) is provided on the rear cover connection surface of the flywheel (1), and the flywheel annular groove (11) and the rear cover (5) form two radial side walls of the U-shaped annular groove (7).

3. The torque limiting vibration damper according to claim 2, characterized in that: The rear cover (5) comprises a flywheel connecting portion (51) located at the outer edge and a vibration damping device connecting portion (52) located at the inner edge, wherein the vibration damping device connecting portion (52) extends in a direction away from the flywheel (1) relative to the flywheel connecting portion (51); The position and radial dimensions of the vibration damping device connecting portion (52) match those of the flywheel ring groove (11); The flywheel annular groove (11) and the vibration damping device connecting portion (52) form two radial side walls of the U-shaped annular groove (7).

4. The torque limiting vibration damper according to any one of claims 1 to 3, characterized in that: The disc spring (2) is connected to the flywheel (1), and the vibration damping device (4) is connected to the rear cover (5).

5. The torque limiting vibration damper according to claim 3, characterized in that: The side of the flywheel (1) is provided with a plurality of threaded holes (13) and positioning holes (14), and the flywheel connecting portion (51) is connected to the threaded holes (13) and the positioning holes (14) respectively through bolts and positioning pins.

6. The torque limiting vibration damper according to claim 1, characterized in that: A locking structure is also provided between the transmission disc (3) and the flywheel (1) or the rear cover (5) to prevent the two from rotating relative to each other.

7. The torque limiting vibration damper according to claim 1 or 6, characterized in that: A positioning protrusion (31) is provided on the outer edge of the transmission disc (3), and the flywheel (1) cooperates with the positioning protrusion (31) via a positioning groove (12).

8. The torque limiting vibration damper according to claim 4, characterized in that: The outer edge of the disc spring (2) contacts the flywheel (1), and the inner edge of the disc spring (2) contacts the transmission disc (3).

9. The torque limiting vibration damper according to any one of claims 1 to 3, characterized in that: The disc spring (2) is connected to the rear cover (5), and the vibration damping device (4) is connected to the flywheel (1).

10. A power transmission device, characterized in that: The torque limiting vibration damper comprises any one of claims 1 to 9, wherein the first torque transmission part (32) is connected to the power input end, and the second torque transmission part (41) is connected to the power output end.

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