Radially staged limited slip damper

Abstract

The application discloses a radial grading torque limiter damper, comprising a damper subassembly and a torque limiter subassembly, a first-stage torque limiter is generated by a smaller-diameter friction pair, and a second-stage torque limiter is generated by a larger-diameter friction pair, so that the function of grading torque limiter is realized. The application has the advantages that the torque limiter function is provided by the cylindrical friction pair, and the number of parts of the torque limiter subassembly is reduced compared with the traditional ring-type friction pair.

Description

Technical Field

[0001] This invention relates to the field of torsional dampers, and particularly to a radially graded torsional damper. Background Technology

[0002] Torque-limiting dampers are mainly used in automotive powertrain systems. They are typically components installed between the engine and transmission to provide vibration reduction, noise reduction, and overload torque protection for automobiles.

[0003] Currently, in hybrid vehicles, due to the use of internal combustion engines, it is generally necessary to install shock absorbers at the crankshaft output end of the engine. Due to the special structure of some hybrid vehicle powertrains, there is no clutch between the engine and the transmission that plays a role in limiting torque. In such applications, the shock absorber must have a torque limiting function. In order to better protect the shock absorber from the impact of resonant torque, it is necessary to improve the torque limiting performance of the torque limiter within a limited space to ensure that the torque limiter can slip within a certain torque range.

[0004] Chinese patent CN214425011U discloses a torque-limiting damper. The torque-limiting structure is implemented by pressing a circular friction plate with a disc spring to provide torque-limiting function. The friction pair is circular and only has a first-level torque-limiting capability, which can easily lead to problems such as excessive torque-limiting.

[0005] The torsion limiting dampers disclosed in Chinese patents CN208669951U and CN210510132U both utilize a disc spring to press against a circular friction pair to provide torsion limiting. The only difference between the two is their application scenarios: CN208669951U is mainly used in high-torque vehicles, while CN210510132U is mainly used in dual-mass flywheel structures.

[0006] This is an area that needs significant improvement in this application. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a radial graded torsion limiting damper that achieves graded torsion limiting function through a cylindrical friction pair.

[0008] To address the above technical problems, this invention provides a radially graded torsional damper, comprising a damper sub-assembly and a torsional limiter sub-assembly.

[0009] The shock absorber sub-assembly includes a steel sheet, on which a plurality of torsion limiting drive angles and a cylindrical first friction pair N are arranged in a circumferentially distributed manner; the cylindrical first friction pair N is a discontinuous cylindrical outer surface formed by the flange of the steel sheet, and the discontinuous positions of the cylindrical outer surface are separated by a plurality of torsion limiting drive angles.

[0010] The torque limiting assembly includes a torque limiting cover plate, a torque limiting friction ring, a first friction ring, a wave spring, a torque limiting cover, and a second friction ring. The torque limiting friction ring has a cylindrical second friction pair G. The first friction ring has a cylindrical first friction pair O, a wave spring groove, multiple circumferentially distributed secondary torque limiting drive angles, and multiple circumferentially distributed external friction ring teeth. The second friction ring has a cylindrical second friction pair H, a guide angle, multiple circumferentially distributed secondary torque limiting drive grooves, multiple circumferentially distributed internal friction ring teeth, and multiple circumferentially distributed springs. The second friction ring is located at the inner diameter of the torque limiting friction ring, with the second friction pair H in close contact with the second friction pair G. The first friction ring is located at the inner diameter of the second friction ring, with the external friction ring teeth meshing with the internal friction ring teeth. The torque limiting friction ring is located between the torque limiting cover plate and the torque limiting cover.

[0011] The torque limiter sub-assembly completes the torque transmission with the shock absorber sub-assembly through the torque limiting drive angle on the steel plate and the first friction pair N. The first friction pair O and the first friction pair N generate relative sliding, generating the first-level torque limiting; the torque limiting drive angle directly drives the second-level torque limiting drive angle and the second-level torque limiting drive groove to drive the second friction ring, so that the second friction pair H and the second friction pair G generate relative sliding, generating the second-level torque limiting.

[0012] The torque limiting drive angle of the steel sheet is arranged between the secondary torque limiting drive angles of the first friction ring and simultaneously arranged within the secondary torque limiting drive groove of the second friction ring. The torque limiting drive angle is in close contact with one side of the secondary torque limiting drive angle and the secondary torque limiting drive groove.

[0013] The first friction pair O on the first friction ring is in close contact with the first friction pair N on the steel sheet.

[0014] The torque limiting drive angle and the secondary torque limiting drive angle and the secondary torque limiting drive groove have the same idle angle gap.

[0015] The torsion limiting cover plate is provided with a plurality of bolt holes A, a plurality of pin holes C, and a plurality of square holes E arranged in a circumferential direction.

[0016] The torsion limiter cover is provided with a plurality of bolt holes B, a plurality of pin holes D, and a plurality of square holes F arranged circumferentially.

[0017] The bolt holes A on the torsion limiting cover and B on the torsion limiting cover are positioned one-to-one to form the mounting bolt holes for the torsion limiting damper. The pin holes C on the torsion limiting cover and D on the torsion limiting cover are positioned one-to-one to form the positioning pin holes for the torsion limiting damper.

[0018] The torsion-limiting friction ring has multiple rivet posts circumferentially distributed on both sides of its axial direction. The number of rivet posts on the side of the torsion-limiting friction ring closest to the torsion-limiting cover plate is equal to the number of holes E above the torsion-limiting cover plate. The rivet posts are arranged one-to-one in the square holes E. The number of rivet posts on the side of the torsion-limiting friction ring closest to the torsion-limiting cover plate is equal to the number of holes F above the torsion-limiting cover plate. The rivet posts are arranged one-to-one in the square holes F. After riveting, all rivet posts undergo plastic deformation to form riveted ends.

[0019] The wave spring is arranged in a wave spring groove between the first and second friction rings. The second friction ring is subjected to radial force generated by the wave spring, causing the outer diameter of the second friction pair H on the second friction ring to be larger than that of the second friction pair G on the torsion-limiting friction ring. The spring on the second friction ring is in the extended state. When the second friction ring is inserted into the torsion-limiting friction ring, it is subjected to the guide angle on the second friction ring, causing the outer diameter of the second friction pair H to gradually decrease, the spring to contract, and the wave spring to be compressed. Finally, when the outer diameter of the second friction pair H is equal to the outer diameter of the second friction pair G, the second friction ring is completely inserted into the torsion-limiting friction ring. This constitutes the torsion limiter sub-assembly.

[0020] The shock absorber sub-assembly includes a large spring, a rubber spring, a splined bushing, a bushing plate, a cover plate, a damping disc spring, a flat pin, and a small spring.

[0021] The steel sheet is also provided with multiple circumferentially distributed spring windows I and multiple circumferentially distributed flat pin holes L.

[0022] The splined bushing is provided with internal splines and spline teeth.

[0023] The bushing plate is provided with a plurality of circumferentially distributed spring windows J and spline holes.

[0024] The cover plate is provided with a plurality of circumferentially distributed spring windows K and a plurality of circumferentially distributed flat pin holes M.

[0025] The spring window I on the steel sheet, the spring window J on the bushing plate, and the spring window K on the cover plate are positioned in a one-to-one correspondence, forming a circumferentially distributed spring mounting space.

[0026] The rubber spring is arranged at the center of the large spring to form a rubber spring assembly; the small spring is arranged at the center of the large spring to form a metal spring assembly; multiple sets of rubber spring assemblies and metal spring assemblies are arranged in the spring mounting space, and the sum of the number of rubber spring assemblies and metal spring assemblies is equal to the number of spring mounting spaces.

[0027] The number of flat pin holes L on the steel sheet is the same as the number of flat pin holes M on the cover plate, and the positions of the two types of flat pin holes correspond one-to-one. The flat pins pass through the two types of flat pin holes to rivet and fix the steel sheet and the cover plate. The spline teeth of the spline bushing are arranged in the spline holes of the bushing plate, and the two contact to transmit torque. The axial position of the spline bushing is constrained and limited by the steel sheet and the bushing plate, and the damping disc spring is arranged between the bushing plate and the cover plate. This constitutes the vibration damper sub-assembly.

[0028] The superior effects of this invention are as follows:

[0029] 1) This invention provides torque limiting function through a cylindrical friction pair, which reduces the number of parts in the torque limiter assembly compared to the traditional annular friction pair;

[0030] 2) This invention achieves the function of graded torque limiting. Through two radially arranged cylindrical friction pairs, the first-level torque limiting is generated by the friction pair with a smaller diameter, and the second-level torque limiting is generated by the friction pair with a larger diameter. Through graded torque limiting, the slippage function of the torque limiter at a certain torque is better guaranteed, and the problem of excessive starting torque of the torque limiter caused by the change of friction coefficient when switching from static friction to dynamic friction is avoided.

[0031] 3) The friction pair generated by this invention operates in a relatively sealed environment, avoiding the influence of rust and dust on the torque limiting of metal parts, thus improving the working stability of the torque limiter. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This is a schematic diagram of the assembly structure according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 AA cross-section view;

[0035] Figure 3 This is an exploded view of an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the torque-limiting friction ring according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of the second friction ring according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the first friction ring according to an embodiment of the present invention;

[0039] Figure 7This is a schematic diagram of the steel sheet structure according to an embodiment of the present invention;

[0040] Figure 8 This is the torque limiting characteristic curve of an embodiment of the present invention;

[0041] Explanation of the labels in the diagram

[0042] 1—Limited torsion cover;

[0043] 101—Bolt hole A; 102—Pin hole C;

[0044] 103—Square Hole E;

[0045] 2—Limiting torque friction ring;

[0046] 201—Second friction pair G; 202—Riveting forming end;

[0047] 203—Riveted Post;

[0048] 3—Steel sheet;

[0049] 301—Limited torque drive angle; 302—Spring window I;

[0050] 303—Flat pin hole L; 304—First friction pair N;

[0051] 4—Large spring; 5—Rubber spring;

[0052] 6—Splined bushing;

[0053] 601—Internal spline; 602—Spline tooth;

[0054] 7—Shaft sleeve plate;

[0055] 701—Spring window J; 702—Spline hole;

[0056] 8—First friction ring;

[0057] 801—First friction pair O; 802—Spring groove;

[0058] 803—Secondary torque limiting drive angle; 804—External teeth of friction ring;

[0059] 9—Wave spring;

[0060] 10—Limited to twist caps;

[0061] 1001—Bolt hole B; 1002—Pin hole D;

[0062] 1003—Square Hole F;

[0063] 11—Second friction ring;

[0064] 1101—Second friction pair H; 1102—Guide angle;

[0065] 1103—Secondary torque limiting drive groove; 1104—Inner teeth of friction ring;

[0066] 1105—Reed;

[0067] 12—Cover plate;

[0068] 1201—Spring window K; 1202—Flat pin hole M;

[0069] 13—Damping disc spring; 14—Flat pin;

[0070] 15—Small spring. Detailed Implementation

[0071] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0072] Figure 1 A schematic diagram of the assembly structure according to an embodiment of the present invention is shown; Figure 2 A cross-sectional view of assembly AA according to an embodiment of the present invention is shown. Figure 3 An exploded view of an embodiment of the present invention is shown. Figures 1-3 As shown, the present invention provides a radial graded torsion limiting vibration damper, including a vibration damper sub-assembly and a torsion limiting sub-assembly.

[0073] The shock absorber sub-assembly includes a steel sheet 3, a large spring 4, a rubber spring 5, a spline bushing 6, a bushing plate 7, a cover plate 12, a damping disc spring 13, a flat pin 14, and a small spring 15.

[0074] like Figure 7 As shown, the steel sheet 3 is provided with a plurality of circumferentially distributed torque limiting drive angles 301, a plurality of circumferentially distributed spring windows I302, a plurality of circumferentially distributed flat pin holes L303, and a cylindrical first friction pair N304. The cylindrical first friction pair N304 is a discontinuous cylindrical outer surface formed by the flange of the steel sheet 3, and the discontinuous positions of the cylindrical outer surface are separated by a plurality of torque limiting drive angles 301.

[0075] The splined bushing 6 is provided with an internal spline 601 and spline teeth 602.

[0076] The bushing plate 7 is provided with a plurality of circumferentially distributed spring windows J701 and spline holes 702.

[0077] The cover plate 12 is provided with a plurality of circumferentially distributed spring windows K1201 and a plurality of circumferentially distributed flat pin holes M1202.

[0078] The spring windows I302 on steel sheet 3, J701 on bushing plate 7, and K1201 on cover plate 12 are of the same number, and their positions correspond one-to-one, forming a circumferentially distributed spring mounting space equal to the number of spring windows. Rubber springs 5 ​​are arranged at the center of large spring 4, forming a rubber spring assembly, and small springs 15 are arranged at the center of large spring 4, forming a metal spring assembly. Multiple sets of rubber spring assemblies and metal spring assemblies are arranged within the spring mounting space, and the sum of the number of rubber spring assemblies and metal spring assemblies equals the number of spring mounting spaces. The flat pin holes L303 on steel sheet 3 and M1202 on cover plate 12 are of the same number, and their positions correspond one-to-one. Flat pins 14 pass through these two types of flat pin holes to rivet and fix steel sheet 3 and cover plate 12. The spline teeth 602 of the spline bushing 6 are arranged in the spline hole 702 of the bushing plate 7, and the two contact each other to transmit torque. The axial position of the spline bushing 6 is constrained and limited by the steel plate 3 and the bushing plate 7. The damping disc spring 13 is arranged between the bushing plate 7 and the cover plate 12. This constitutes the vibration damper sub-assembly.

[0079] The torque limiting device sub-assembly includes a torque limiting cover plate 1, a torque limiting friction ring 2, a first friction ring 8, a wave spring 9, a torque limiting cover 10, and a second friction ring 11.

[0080] The torsion limiting cover plate 1 is provided with a plurality of bolt holes A101, a plurality of pin holes C102, and a plurality of square holes E103 arranged in a circumferential direction.

[0081] like Figure 4 As shown, the torsion limiting friction ring 2 is provided with a cylindrical second friction pair G201 and multiple riveting posts 203 distributed circumferentially on both sides of the axial direction. The cylindrical second friction pair G201 is the cylindrical inner hole surface of the torsion limiting friction ring 2.

[0082] like Figure 6 As shown, the first friction ring 8 is provided with a cylindrical first friction pair O801, a wave spring groove 802, a plurality of circumferentially distributed secondary torque limiting drive angles 803, and a plurality of circumferentially distributed external friction ring teeth 804. The cylindrical first friction pair O801 is the cylindrical inner hole surface of the first friction ring 8.

[0083] The torsion limiting cover 10 is provided with a plurality of bolt holes B1001, a plurality of pin holes D1002, and a plurality of square holes F1003 arranged in a circumferential direction.

[0084] like Figure 5As shown, the second friction ring 11 is provided with a cylindrical second friction pair H1101, a guide angle 1102, a plurality of circumferentially distributed secondary torque limiting drive grooves 1103, a plurality of circumferentially distributed friction ring internal teeth 1104, and a plurality of circumferentially distributed springs 1105. The cylindrical second friction pair H1101 is the cylindrical outer surface of the second friction ring 11.

[0085] The bolt holes A101 on the torsion limiting cover plate 1 and B1001 on the torsion limiting cover 10 correspond one-to-one to form the mounting bolt holes for the torsion limiting damper. The pin holes C102 on the torsion limiting cover plate 1 and D1002 on the torsion limiting cover 10 correspond one-to-one to form the positioning pin holes for the torsion limiting damper. The torsion limiting friction ring 2 is arranged between the torsion limiting cover plate 1 and the torsion limiting cover 10. The number of rivet posts 203 on the axial side of the torsion limiting friction ring 2 closest to the torsion limiting cover plate 1 is equal to the number of holes E103 above the torsion limiting cover plate 1. The rivet posts 203 are arranged one-to-one in the square holes E103. The number of rivet posts 203 on the axial side of the torsion limiting friction ring 2 closest to the torsion limiting cover 10 is equal to the number of holes F1003 above the torsion limiting cover 10. The rivet posts 203 are arranged one-to-one in the square holes F1003. After riveting, all rivet posts 203 are plastically deformed into riveted end 202.

[0086] The second friction ring 11 is located at the inner diameter of the torsion-limiting friction ring 2, and the second friction pair H1101 on the second friction ring 11 is in close contact with the second friction pair G201 on the torsion-limiting friction ring 2. The first friction ring 8 is located at the inner diameter of the second friction ring 11, and the external friction ring teeth 804 on the first friction ring 8 mesh with the internal friction ring teeth 1104 on the second friction ring 11. The wave spring 9 is located between the first friction ring 8 and the second friction ring 11, that is, in the wave spring groove 802 of the first friction ring 8. Due to the radial force generated by the wave spring 9, when the second friction ring 11 is not installed inside the torque-limiting friction ring 2, the outer diameter of the second friction pair H1101 is larger than that of the second friction pair G201, and the spring 1105 on the second friction ring 11 is in a pulled-out state. When the second friction ring 11 is installed inside the torque-limiting friction ring 2, under the action of the guide angle 1102 on the second friction ring 11, the outer diameter of the second friction pair H1101 gradually decreases, the spring 1105 contracts, and the wave spring 9 is compressed. Finally, when the outer diameter of the second friction pair H1101 is equal to the outer diameter of the second friction pair G201, the second friction ring 11 is fully installed inside the torque-limiting friction ring 2. This constitutes the torque limiter sub-assembly.

[0087] The torque limiter subassembly transmits torque to the damper subassembly via the torque-limiting drive angle 301 on the steel plate 3 and the first friction pair N304. The torque-limiting drive angle 301 is positioned between the secondary torque-limiting drive angles 803 of the first friction ring 8 and simultaneously within the secondary torque-limiting drive groove 1103 of the second friction ring 11. The first friction pair O801 on the first friction ring 8 is in close contact with the first friction pair N304. The torque-limiting drive angle 301 has the same freewheeling angle clearance as the secondary torque-limiting drive angle 803 and the secondary torque-limiting drive groove 1103. Figure 8 As shown, when the first-level torque limiting occurs, relative sliding occurs between the inner and outer cylindrical surfaces of the first friction pair O801 and the first friction pair N304, and the sliding angle is equal to the idle angle clearance. When the second-level torque limiting occurs, the first friction pair O801 and the first friction pair N304 no longer slide, and the torque limiting drive angle 301 is in close contact with the second-level torque limiting drive angle 803 and the second-level torque limiting drive groove 1103. The torque limiting drive angle 301 directly drives the second-level torque limiting drive angle 803 and the second-level torque limiting drive groove 1103 to drive the second friction ring 11, so that the inner and outer cylindrical surfaces of the second friction pair H1101 and the second friction pair G201 slide relative to each other, generating the second-level torque limiting.

[0088] When the torque limiter subassembly is assembled in the powertrain, the torque limiter subassembly is generally connected to the flywheel through the mounting bolt holes and locating pin holes to transmit engine power, while the shock absorber subassembly outputs engine power to the transmission through the internal splines on the splined bushing 6.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A radially graded torsional damper, comprising a damper sub-assembly and a torsional limiter sub-assembly, characterized in that: The shock absorber sub-assembly includes a steel sheet, on which a plurality of torsion-limiting drive angles and a cylindrical first friction pair N are arranged in a circumferentially distributed manner. The torque limiting device sub-assembly includes a torque limiting cover plate, a torque limiting friction ring, a first friction ring, a wave spring, a torque limiting cover, and a second friction ring; the torque limiting friction ring is provided with a cylindrical second friction pair G, and the first friction ring is provided with a cylindrical first friction pair O, a plurality of circumferentially distributed secondary torque limiting drive angles, and a plurality of circumferentially distributed friction ring external teeth. The second friction ring is provided with a cylindrical second friction pair H, a plurality of circumferentially distributed secondary torque limiting drive grooves, and a plurality of circumferentially distributed friction ring inner teeth; the second friction ring is arranged at the inner diameter of the torque limiting friction ring, and the second friction pair H is in close contact with the second friction pair G; the first friction ring is arranged at the inner diameter of the second friction ring, and the outer teeth of the friction ring mesh with the inner teeth of the friction ring; the torque limiting friction ring is arranged between the torque limiting cover plate and the torque limiting cover; The torque limiter sub-assembly completes the torque transmission with the shock absorber sub-assembly through the torque limiting drive angle on the steel plate and the first friction pair N. The first friction pair O and the first friction pair N generate relative sliding, generating the first-level torque limiting; the torque limiting drive angle directly drives the second-level torque limiting drive angle and the second-level torque limiting drive groove to drive the second friction ring, so that the second friction pair H and the second friction pair G generate relative sliding, generating the second-level torque limiting.

2. The radial graded torsional damper according to claim 1, characterized in that: The torque limiting drive angle of the steel sheet is arranged between the secondary torque limiting drive angles of the first friction ring and simultaneously arranged within the secondary torque limiting drive groove of the second friction ring. The torque limiting drive angle is in close contact with one side of the secondary torque limiting drive angle and the secondary torque limiting drive groove.

3. The radial graded torsional damper according to claim 1, characterized in that: The first friction pair O on the first friction ring is in close contact with the first friction pair N on the steel sheet.

4. The radial graded torsional damper according to claim 1, characterized in that: The torque limiting drive angle and the secondary torque limiting drive angle and the secondary torque limiting drive groove have the same idle angle gap.

5. The radial graded torsional damper according to claim 1, characterized in that: The wave spring is arranged in the wave spring groove between the first friction ring and the second friction ring. The second friction ring is subjected to the radial force generated by the wave spring, which causes the outer diameter of the second friction pair H on the second friction ring to be larger than the second friction pair G of the torsion limiting friction ring.

6. The radial graded torsional damper according to claim 1, characterized in that: The torque-limiting friction ring has multiple rivet posts circumferentially distributed on both sides of its axial direction. The rivet posts on both sides are respectively arranged in the square holes of the torque-limiting cover plate and the torque-limiting cover. After riveting, all rivet posts are plastically deformed into riveted ends.

7. The radial graded torsional damper according to claim 1, characterized in that: The shock absorber sub-assembly includes a large spring, a rubber spring, a spline bushing, a bushing plate, a cover plate, a damping disc spring, a flat pin, and a small spring. The spring window I on the steel sheet, the spring window J on the bushing plate, and the spring window K on the cover plate are positioned in a one-to-one correspondence, forming a circumferentially distributed spring mounting space.

8. The radial graded torsional damper according to claim 7, characterized in that: The rubber spring is arranged at the center of the large spring to form a rubber spring assembly; the small spring is arranged at the center of the large spring to form a metal spring assembly; multiple sets of rubber spring assemblies and metal spring assemblies are arranged in the spring mounting space, and the sum of the number of rubber spring assemblies and metal spring assemblies is equal to the number of spring mounting spaces.

9. The radial graded torsional damper according to claim 7, characterized in that: The spline teeth of the spline bushing are arranged in the spline hole of the bushing plate, and the two contact each other to transmit torque; the flat pin rivets and fixes the steel sheet and the cover plate, and the axial position of the spline bushing is constrained and limited by the steel sheet and the bushing plate. The damping disc spring is arranged between the bushing plate and the cover plate.

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