Multi-piece torque limiter

Abstract

The present invention discloses a multi-plate torque limiter, wherein the torque transmission flange of the force transmission plate is embedded in the torque transmission hole of the shaft sleeve plate to form four friction pairs for torque input, the cover plate and the spline shaft sleeve are riveted and fixed, the torque transmission flange of the disc spring is embedded in the torque transmission hole of the spline shaft sleeve, the friction plate is arranged between the shaft sleeve plate friction pair B and the force transmission plate friction pair A, and the spline teeth of the friction plate are embedded in the torque transmission window to form four friction pairs for torque output; the four torque input and output friction pairs are pressed against the torque transmission by the disc spring pressure, and there is no relative rotation between the friction pairs; when the torque generation exceeds the abnormal fluctuation of the engine torque, relative rotation is generated between the friction pairs, the excess torque is consumed by slipping, and the torque is reduced to within the range and then input into the gearbox. The advantage of the present invention is that it only requires a small radial space to achieve a torque limiting function with large torque.

Description

Technical Field

[0001] The invention relates to the field of torque limiters, and in particular to a multi-piece torque limiter. Background Art

[0002] Torque limiters are mainly used in automotive powertrain systems, generally in powertrain systems that are not equipped with a clutch, especially in hybrid powertrains. When used in conjunction with shock absorbers, they can prevent powertrain torque overload and protect the powertrain.

[0003] At present, in the powertrain system of hybrid vehicles, in many cases, the clutch is not required to transmit and interrupt torque. In this case, a torque limiter is needed. Due to the existence of the engine, a shock absorber is needed to reduce the vibration of the engine. Under certain special working conditions, due to the resonance of the powertrain system and other reasons, the system will produce an impact far greater than the maximum output torque of the engine. At this time, a torque limiter is needed to limit the impact torque. The torque limiter reduces the impact torque to a reasonable range through its own slippage and then inputs it into the gearbox to prevent damage to the system.

[0004] The torque limiter disclosed in CN 204610617 and CN 206530653 U has a small diameter and only two friction pairs, which cannot transmit a large torque. The torque limiter disclosed in CN 205836529 U is arranged outside the shock absorber, which limits the diameter of the shock absorber and causes relatively poor performance of the shock absorber.

[0005] Most of the existing torque limiters are monolithic structures with only two friction pairs. Under the premise of meeting the torque transmission requirements, the required diameter is relatively large. When used in combination with a shock absorber, it is generally arranged at the outer diameter of the shock absorber. Currently, there is no torque limiter arranged at the inner diameter of the shock absorber. Arranging it at the inner diameter will result in a smaller radial size of the torque limiter and will not be able to transmit a larger torque. The torque limiter can simultaneously meet the torque limiting requirements of small radial size and large torque, which is the area that needs to be improved in this application. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a multi-plate torque limiter which can realize the function of large torque limiting.

[0007] In order to solve the above technical problems, the present invention provides a multi-piece torque limiter, comprising:

[0008] The shaft sleeve plate is provided with a shaft sleeve plate torque transmission hole, a shaft sleeve plate friction pair A, and a shaft sleeve plate friction pair B;

[0009] The force transmission plate is provided with a force transmission plate torsion flange, a force transmission plate friction pair A, and a force transmission plate friction pair B;

[0010] The torque transmission flange of the force transmission plate is embedded in the torque transmission hole of the shaft sleeve plate, and the two correspond to each other one by one, thereby forming four friction pairs for torque input, namely, the shaft sleeve plate friction pair A, the shaft sleeve plate friction pair B, the force transmission plate friction pair A and the force transmission plate friction pair B;

[0011] A cover plate, which is provided with a cover plate friction pair, a torque transmission window, and a cover plate rivet hole;

[0012] A spline sleeve is provided with a spline sleeve torque transmission hole, output spline teeth, and a spline sleeve rivet hole;

[0013] The rivets pass through the rivet holes of the cover plate and the rivet holes of the spline shaft sleeve to rivet and fix the cover plate and the spline shaft sleeve;

[0014] A disc spring is provided with a disc spring torsion transmission flange and a disc spring friction pair; the disc spring torsion transmission flange is embedded in the spline shaft sleeve torsion transmission hole, and the two correspond one to one;

[0015] A friction plate, on which a friction plate friction pair A, a friction plate spline tooth, and a friction plate friction pair B are arranged; the friction plate is arranged between the shaft sleeve plate friction pair B and the force transmission plate friction pair A;

[0016] The friction plate spline teeth are embedded in the torque transmission window, and the two correspond one to one, thereby forming four friction pairs for torque output, namely, the cover plate friction pair, the friction plate friction pair A, the friction plate friction pair B, and the disc spring friction pair;

[0017] The disc spring is axially constrained by the force transmission plate and the spline sleeve, and the disc spring is compressed to generate pressure; the four torque input friction pairs and the four torque output friction pairs are tightly pressed against each other under the pressure of the disc spring to transmit torque. In the process of transmitting torque, the four torque input friction pairs and the four torque output friction pairs fit together to transmit torque, and there is no relative rotation between the friction pairs; when the torque produces abnormal fluctuations that exceed a certain multiple of the engine torque, relative rotation is generated between the friction pairs, and the excess torque is consumed through slippage, and the torque is reduced to within the range and then input into the gearbox.

[0018] The four torque input friction pairs and the four torque output friction pairs are subjected to the pressure of the disc spring and are tightly pressed against each other to transmit torque, which means that the shaft sleeve plate friction pair A fits with the cover plate friction pair, the shaft sleeve plate friction pair B fits with the friction plate friction pair A, the force transmission plate friction pair A fits with the friction plate friction pair B, and the force transmission plate friction pair B fits with the disc spring friction pair.

[0019] The shaft sleeve plate inputs the engine power into the multi-plate torque limiter through the torque input angle, and the end surface of the torque input angle contacts the elastic part, that is, the power input end of the multi-plate torque limiter is a shock absorber.

[0020] Every time the number of the force transmission plates is increased, two torque input friction pairs are correspondingly increased.

[0021] The number of the torque transmission holes of the shaft sleeve plate and the torque transmission flanges of the force transmission plate are the same, and both are arranged to be greater than 2.

[0022] The disc spring torque transmission flange and the spline shaft sleeve torque transmission hole are the same in number, and are both arranged in greater than 2 numbers.

[0023] Every time the number of the friction plates is increased by one, two torque output friction pairs are correspondingly increased.

[0024] In the multi-plate torque limiter assembly, the number of the force transmission plates and the number of the friction plates are set to be greater than or equal to 1, that is, the number of the torque input friction pairs and the torque output friction pairs is an even number greater than or equal to 2.

[0025] The number of the friction plate spline teeth is the same as that of the torque transmission windows, and both are arranged to be greater than 2.

[0026] The superior effects of the structure of the present invention are:

[0027] 1) The present invention provides a multi-piece torque limiter with more than two friction pairs, which only requires a small radial space to achieve a large torque limiting function;

[0028] 2) The present invention can be quickly matched with mature vibration damper structures such as flywheel vibration damper and dual-mass flywheel, and only a small number of parts need to be replaced without making major changes to the existing mature structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 It is a schematic cross-sectional view of an assembly of an embodiment of the present invention;

[0031] Figure 2 It is a cross-sectional schematic diagram of the assembly of some parts of an embodiment of the present invention;

[0032] Description of the symbols in the figure

[0033] 1-shaft sleeve plate;

[0034] 101-shaft sleeve plate torque transmission hole; 102-shaft sleeve plate friction pair A;

[0035] 103 - shaft sleeve plate friction pair B; 104 - torque input angle;

[0036] 2- force transmission plate;

[0037] 201-torsion transfer flange of force transfer plate; 202-friction pair A of force transfer plate;

[0038] 203- force transmission plate friction pair B;

[0039] 3-cover plate;

[0040] 301-cover plate friction pair; 302-torque transmission window;

[0041] 303-cover plate rivet hole;

[0042] 4- disc spring;

[0043] 401-disc spring torsion flange; 402-disc spring friction pair;

[0044] 5-Spline bushing;

[0045] 501-spline shaft sleeve torque transmission hole; 502-output spline teeth;

[0046] 503 - spline bushing rivet hole;

[0047] 6-Friction plate;

[0048] 601-friction plate friction pair A; 602-friction plate spline teeth;

[0049] 603-Friction plate friction pair B;

[0050] 7-Rivet. DETAILED DESCRIPTION

[0051] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] Figure 1 The figure shows a schematic cross-sectional view of an assembly of an embodiment of the present invention. Figure 2 FIG. 2 shows a schematic cross-sectional view of the assembly of some parts of an embodiment of the present invention. Figure 1 and Figure 2 As shown, the present invention provides a multi-plate torque limiter, including a shaft sleeve plate 1, a force transmission plate 2, a cover plate 3, a disc spring 4, a spline shaft sleeve 5, a friction plate 6 and a rivet 7.

[0053] The sleeve plate 1 inputs the engine power into the multi-plate torque limiter through the torque input angle 104. The end face of the torque input angle 104 contacts with parts such as springs, that is, the power input end of the multi-plate torque limiter is a shock absorber. The sleeve plate 1 is provided with a sleeve plate torque transmission hole 101, a sleeve plate friction pair A102, and a sleeve plate friction pair B103. The force transmission plate 2 is provided with a force transmission plate torque transmission flange 201, a force transmission plate friction pair A202, and a force transmission plate friction pair B203. The sleeve plate torque transmission hole 101 and the force transmission plate torque transmission flange 201 are the same in number, and both are arranged in more than 2. The force transmission plate torque transmission flange 201 is embedded in the sleeve plate torque transmission hole 101, and the two correspond one to one, thereby forming four torque input friction pairs, namely, the sleeve plate friction pair A102, the sleeve plate friction pair B103, the force transmission plate friction pair A202, and the force transmission plate friction pair B203. According to actual application conditions, the number of torque input friction pairs is further increased by increasing the number of force transmission plates 2 , and an increase of one force transmission plate 2 corresponds to an increase of two friction pairs.

[0054] The cover plate 3 is provided with a cover plate friction pair 301, a torque transmission window 302, and a cover plate rivet hole 303. The spline sleeve 5 is provided with a spline sleeve torque transmission hole 501, an output spline tooth 502, and a spline sleeve rivet hole 503. The rivet 7 passes through the cover plate rivet hole 303 and the spline sleeve rivet hole 503 to rivet the cover plate 3 and the spline sleeve 5. The disc spring 4 is provided with a disc spring torque transmission flange 401 and a disc spring friction pair 402. The disc spring 4 is axially constrained by the force transmission plate 2 and the spline sleeve 5. The disc spring 4 is compressed to generate pressure. The disc spring torque transmission flange 401 is the same as the spline sleeve torque transmission hole 501, and both are arranged more than 2. The disc spring torque transmission flange 401 is embedded in the spline sleeve torque transmission hole 501, and the two correspond one to one. The friction plate 6 is provided with a friction plate friction pair A601, a friction plate spline tooth 602, and a friction plate friction pair B603. The friction plate 6 is arranged between the shaft sleeve plate friction pair B103 and the force transmission plate friction pair A202. The friction plate spline teeth 602 are the same in number as the torque transmission window 302, and both are arranged in more than 2. The friction plate spline teeth 602 are embedded in the torque transmission window 302, and the two correspond to each other, thereby forming four torque output friction pairs, namely the cover plate friction pair 301, the friction plate friction pair A601, the friction plate friction pair B603, and the disc spring friction pair 402. The engine torque is transmitted to the next component through the output spline teeth 502. According to the actual application situation, the number of friction plates 6 can be increased to further increase the number of torque output friction pairs. Adding one friction plate 6 corresponds to adding two friction pairs.

[0055] The four torque input friction pairs and the four torque output friction pairs are pressed against each other by the disc spring 4 to transmit torque in a one-to-one manner. The shaft sleeve plate friction pair A102 is fitted with the cover plate friction pair 301, the shaft sleeve plate friction pair B103 is fitted with the friction plate friction pair A601, the force transmission plate friction pair A202 is fitted with the friction plate friction pair B603, and the disc spring friction pair 402 is fitted with the force transmission plate friction pair B203. In the process of transmitting torque, the four torque input friction pairs and the four torque output friction pairs are fitted together to transmit torque, and there is no relative rotation between the friction pairs. When the torque produces an abnormal fluctuation that exceeds a certain multiple of the engine torque, relative rotation occurs between the friction pairs, and the excess torque is consumed by slipping, thereby avoiding damage to the front and rear end components of the torque limiter.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-piece torque limiter, comprising: The shaft sleeve plate is provided with a shaft sleeve plate torque transmission hole, a shaft sleeve plate friction pair A, and a shaft sleeve plate friction pair B; The force transmission plate is provided with a force transmission plate torsion flange, a force transmission plate friction pair A, and a force transmission plate friction pair B; The torque transmission flange of the force transmission plate is embedded in the torque transmission hole of the shaft sleeve plate to form four friction pairs for torque input, namely, the shaft sleeve plate friction pair A, the shaft sleeve plate friction pair B, the force transmission plate friction pair A and the force transmission plate friction pair B; A cover plate, which is provided with a cover plate friction pair, a torque transmission window, and a cover plate rivet hole; A spline sleeve is provided with a spline sleeve torque transmission hole, output spline teeth, and a spline sleeve rivet hole; The rivets pass through the rivet holes of the cover plate and the rivet holes of the spline shaft sleeve to rivet and fix the cover plate and the spline shaft sleeve; A disc spring, on which a disc spring torsion transmission flange and a disc spring friction pair are provided; the disc spring torsion transmission flange is embedded in the spline shaft sleeve torsion transmission hole; A friction plate, on which a friction plate friction pair A, a friction plate spline tooth, and a friction plate friction pair B are arranged; the friction plate is arranged between the shaft sleeve plate friction pair B and the force transmission plate friction pair A; The friction plate spline teeth are embedded in the torque transmission window to form four torque output friction pairs, namely, the cover plate friction pair, the friction plate friction pair A, the friction plate friction pair B, and the disc spring friction pair; The four torque input friction pairs and the four torque output friction pairs are pressed against each other under the pressure of the disc spring to transmit torque, which means that the shaft sleeve plate friction pair A is in contact with the cover plate friction pair, the shaft sleeve plate friction pair B is in contact with the friction plate friction pair A, the force transmission plate friction pair A is in contact with the friction plate friction pair B, and the force transmission plate friction pair B is in contact with the disc spring friction pair; in the process of transmitting torque, the four torque input friction pairs and the four torque output friction pairs are in contact with each other to transmit torque, and there is no relative rotation between the friction pairs; When the torque produces abnormal fluctuations exceeding a certain multiple of the engine torque, relative rotation occurs between the two friction pairs, and the excess torque is consumed through slippage, and the torque is reduced to a range and then input into the gearbox; the shaft sleeve plate inputs the engine power into the multi-plate torque limiter through the torque input angle, and the end face of the torque input angle contacts the elastic part, that is, the power input end of the multi-plate torque limiter is a shock absorber.

2. The multi-piece torque limiter according to claim 1, characterized in that: Every time the number of the force transmission plates is increased, two torque input friction pairs are correspondingly increased.

3. The multi-piece torque limiter according to claim 1, characterized in that: The number of the torque transmission holes of the shaft sleeve plate and the torque transmission flanges of the force transmission plate are the same, and both are arranged to be greater than 2.

4. The multi-piece torque limiter according to claim 1, characterized in that: The disc spring torque transmission flange and the spline shaft sleeve torque transmission hole are the same in number, and are both arranged in greater than 2 numbers.

5. The multi-piece torque limiter according to claim 1, characterized in that: Every time the number of the friction plates is increased by one, two torque output friction pairs are correspondingly increased.

6. The multi-piece torque limiter according to claim 1, characterized in that: The number of the friction plate spline teeth is the same as that of the torque transmission windows, and both are arranged to be greater than 2.

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