CN-115917182-B - Vibration damper

Abstract

A friction generating mechanism (1) of a damper device is provided with a sleeve (6) which is in contact with an annular friction surface (4 c) of a spline hub (4), and a conical spring (7) which is arranged between a baffle plate (5) and the sleeve (6) in a compressed state. The 1 st load support surface (9) of the sleeve (6) and the 2 nd load support surface (10) of the baffle plate (5) have stepped portions (9 a, 10 a) which recede to accommodate the outer peripheral edge (7 b) and the inner peripheral edge (7 a) respectively when the conical springs (7) face in opposite directions. The radial positions of the boundaries (9 c, 10 c) of the stepped parts (9 a, 10 a) are in a relationship D1> D2, and the conical spring (7) is not reversed even if an excessive axial load is input.

Inventors

• LIANG FANG
• OOTANI MASAYUKI
• Lai Shangjian
• NAKATANI MASAHIRO

Assignees

• 日产自动车株式会社
• 爱思帝股份有限公司

Dates

Publication Date

20260508

Application Date

20210827

Priority Date

20200904

Claims (9)

1. 1. A vibration damping device, comprising: A1 st rotation member; a 2 nd rotation member configured to be rotatable relative to the 1 st rotation member; A spring member for elastically connecting the 1 st rotation member and the 2 nd rotation member in a rotation direction, and A friction generating mechanism for generating friction torque against the relative rotation between the 1 st rotation member and the 2 nd rotation member, The friction generating mechanism includes: A sleeve having a rear surface in contact with the annular friction surface of the 2 nd rotary member and an approximately L-shaped cross section; a baffle plate which is a part of the 1 st rotation member axially opposite to the sleeve, and An annular conical spring disposed in a compressed state between the sleeve and the baffle plate to pre-tighten the sleeve against the annular friction surface, A 1 st load supporting surface which is abutted against the inner periphery of the conical spring is formed on the sleeve, a2 nd load supporting surface which is abutted against the outer periphery is formed on the baffle plate, The 1 st load supporting surface and the 2 nd load supporting surface are respectively provided with a1 st step part and a2 nd step part which are retreated in the axial direction in a manner of accommodating the outer periphery and the inner periphery of the conical spring when the conical spring is assembled in opposite directions, The radial position of the boundary of the 1 st step portion of the 1 st load supporting surface is located on the outer peripheral side from the radial position of the boundary of the 2 nd step portion of the 2 nd load supporting surface.
2. 2. The vibration damping device according to claim 1, wherein, The tapered spring has an inner peripheral edge which is continuous in a circular shape and an outer peripheral edge which is formed in an uneven shape by a plurality of cut portions.
3. 3. The vibration damping device according to claim 1, wherein, The sleeve is made of synthetic resin, and the baffle is made of metal.
4. 4. The vibration damping device according to claim 1, wherein, The conical spring has a continuous circular portion in contact with the sleeve.
5. 5. The vibration damping device according to claim 1, wherein, The conical spring has a concave-convex portion contacting the baffle plate.
6. 6. The vibration damping device according to claim 1, wherein, The 1 st diameter of the boundary of the 1 st step is larger than the 2 nd diameter of the boundary of the 2 nd step.
7. 7. The vibration damping device according to claim 6, wherein, The conical spring is clamped in the region between the 1 st diameter and the 2 nd diameter.
8. 8. The vibration damping device according to claim 1, wherein, The 1 st load bearing surface is parallel to the 2 nd load bearing surface.
9. 9. The vibration damping device according to claim 8, wherein, The 1 st load supporting surface and the 2 nd load supporting surface are perpendicular to the axial direction.

Description

Vibration damper Technical Field The present invention relates to a vibration damping device provided between an internal combustion engine and a transmission, for example. Background For example, a vibration damping device that transmits torque and absorbs/dampens torsional vibrations is often provided between an internal combustion engine and a transmission of an automobile. As disclosed in patent document 1, this vibration damping device has an input-side rotating member to which torque is input from an internal combustion engine, an output-side rotating member that is relatively rotatably combined with the input-side rotating member, and a plurality of coil springs that are arranged in a rotation tangential direction between the input-side rotating member and the output-side rotating member. Further, in the vibration damping device of patent document 1, as a friction generating mechanism that generates friction torque with respect to relative rotation between an input-side rotating member and an output-side rotating member, there is disclosed a structure in which a sleeve that is in sliding contact with a spline hub that is the output-side rotating member is preloaded in an axial direction by an annular conical spring. The conical spring of patent document 1 has a small inclined conical cross section, and is disposed so as to be inclined at an axial position such that an inner peripheral edge is located near the sleeve and an outer peripheral edge is located near the baffle. With this structure, for example, when the spline hub receives a very large load in the axial direction and the conical spring is displaced so as to be flattened, the conical spring may be reversed in a direction opposite to the original conical direction. More specifically, the position of the point of application of the force by which the shutter presses the conical spring and the position of the point of application of the force by which the sleeve presses the conical spring in the opposite direction do not take into account such a reverse rotation phenomenon. Patent document 1 Japanese patent laid-open publication No. 2003-074636 Disclosure of Invention The vibration damping device of the present invention includes a 1 st rotation member, a2 nd rotation member, a spring member that elastically connects the two members, and a friction generating mechanism that generates friction torque against relative rotation. The friction generating mechanism includes a sleeve that contacts an annular friction surface of the 2 nd rotary member, a shutter that is a part of the 1 st rotary member that axially faces the sleeve, and an annular conical spring that is disposed between the sleeve and the sleeve in a compressed state to pre-tighten the sleeve against the annular friction surface. In the 1 st aspect, the 1 st load supporting surface which is in contact with the inner peripheral edge of the conical spring is formed on the sleeve so as to face each other, the 2 nd load supporting surface which is in contact with the outer peripheral edge is formed on the baffle plate, The 1 st load supporting surface and the 2 nd load supporting surface are respectively formed with a step part which retreats in the axial direction in a manner of accommodating the outer periphery and the inner periphery of the conical spring when the conical spring is assembled in the opposite direction, The radial position of the boundary of the step portion of the 1 st load supporting surface is located on the outer peripheral side from the radial position of the boundary of the step portion of the 2 nd load supporting surface. In the 2 nd aspect, the 1 st load supporting surface which is abutted against the inner peripheral edge of the conical spring is formed on the sleeve, the 2 nd load supporting surface which is abutted against the outer peripheral edge is formed on the baffle plate, The 1 st load supporting surface is formed with a step part which retreats in the axial direction in a manner of accommodating the outer periphery of the conical spring when the conical spring is assembled in the opposite direction, The radial position of the boundary of the step portion of the 1 st load supporting surface is located on the outer peripheral side from the radial position of the inner peripheral side edge of the 2 nd load supporting surface which is a flat surface. In the 3 rd aspect, the 1 st load supporting surface, which is in contact with the outer peripheral edge of the conical spring, is formed on the sleeve, the 2 nd load supporting surface, which is in contact with the inner peripheral edge, is formed on the baffle plate, The 1 st load supporting surface and the 2 nd load supporting surface are respectively formed with a step part which retreats in the axial direction in a manner of accommodating the inner periphery and the outer periphery of the conical spring when the conical spring is assembled in the opposite direction, The radial position of the boundary of