Granted Patent B2

US 12,644,496 · App. 18/165,901 · Granted Jun 2, 2026

Inventor: Tatsunori Taniguchi (Aichi, JP)

Assignee: Sumitomo Riko Company Limited

F16F1/3821F16F2224/025F16F2230/0041F16F2234/02

Abstract

Claims (25)

1 . A cylindrical vibration-damping device having a radial direction, a left-right direction and an axial direction orthogonal with each other, comprising:

an inner shaft fitting, having a central side and an outer side opposite to the central side in the radial direction;

an outer cylindrical member; and

a main rubber elastic body, elastically linking the inner shaft fitting and the outer cylindrical member,

wherein a press-fit fitting is installed to a press-fit part of the inner shaft fitting,

wherein

the inner shaft fitting is in a substantially cylindrical shape, and the inner shaft fitting includes a first rotation limiting surface and a press-fit guide surface, and

the press-fit fitting is provided with an insertion hole penetrating through the press-fit fitting in the axial direction, and a cylindrical part protruding in the axial direction is provided at a circumferential edge part of the insertion hole, and the press-fit fitting includes a second rotation limiting surface,

wherein

the first rotation limiting surface has a first curvature that is reduced compared with portions deviated from the first rotation limiting surface on two sides in a circumferential direction on an outer circumferential surface of the inner shaft fitting, and

the press-fit fitting is installed to the outer circumferential surface of the inner shaft fitting comprising the first rotation limiting surface,

wherein the second rotation limiting surface has a second curvature that is reduced compared with portions deviated from the second rotation limiting surface on two sides in the circumferential direction on an inner circumferential surface of the insertion hole of the press-fit fitting into which the inner shaft fitting is inserted, wherein the second curvature of the second rotation limiting surface is in correspondence with the first curvature of the first rotation limiting surface,

the first rotation limiting surface of the inner shaft fitting and the second rotation limiting surface of the press-fit fitting are superimposed to each other to be arranged in a press-fit state, and

the press-fit guide surface is located on the central side of the inner shaft fitting with respect to the first rotation limiting surface located on the outer side of the inner shaft fitting in the radial direction, the press-fit guide surface has a width dimension in the left-right direction greater than that of the first rotation limiting surface, and the press-fit guide surface provided on an axially end of the first rotation limiting surface is provided on the outer circumferential surface of the inner shaft fitting.

2 . The cylindrical vibration-damping device as claimed in claim 1 , wherein the first rotation limiting surface and the press-fit guide surface are connected by a stepped surface expanding in an axis right angle direction of the inner shaft fitting,

on the inner circumferential surface of the insertion hole in the press-fit fitting, a guide inclination surface guiding the first rotation limiting surface into the insertion hole through contact of an end edge on a side of the first rotation limiting surface in the stepped surface is provided at an axial end edge part.

3 . The cylindrical vibration-damping device as claimed in claim 1 , wherein the first rotation limiting surface is arranged as a planar surface expanding in parallel with the axial direction of the inner shaft fitting, and the press-fit guide surface is arranged as a planar surface expanding in parallel with the first rotation limiting surface.

4 . The cylindrical vibration-damping device as claimed in claim 1 , wherein a pair of first rotation limiting surfaces are provided on two sides of the inner shaft fitting in the radial direction, and a pair of second rotation limiting surfaces facing each other in the radial direction are provided on the inner circumferential surface of the insertion hole in the press-fit fitting, and

the press-fit guide surface is provided on an axially end of each of the pair of first rotation limiting surfaces.

5 . The cylindrical vibration-damping device as claimed in claim 4 , wherein the portions deviated from the first rotation limiting surface on two sides in the circumferential direction on the outer circumferential surface of the inner shaft fitting are inserted into the insertion hole of the press-fit fitting in a non-press-fit state.

6 . The cylindrical vibration-damping device as claimed in claim 2 , wherein the first rotation limiting surface is arranged as a planar surface expanding in parallel with the axial direction of the inner shaft fitting, and the press-fit guide surface is arranged as a planar surface expanding in parallel with the first rotation limiting surface.

7 . The cylindrical vibration-damping device as claimed in claim 2 , wherein a pair of first rotation limiting surfaces are provided on two sides of the inner shaft fitting in the radial direction, and a pair of second rotation limiting surfaces facing each other in the radial direction are provided on the inner circumferential surface of the insertion hole in the press-fit fitting, and

the press-fit guide surface is provided on an axially end of each of the pair of first rotation limiting surfaces.

8 . The cylindrical vibration-damping device as claimed in claim 3 , wherein a pair of first rotation limiting surfaces are provided on two sides of the inner shaft fitting in the radial direction, and a pair of second rotation limiting surfaces facing each other in the radial direction are provided on the inner circumferential surface of the insertion hole in the press-fit fitting, and

the press-fit guide surface is provided on an axially end of each of the pair of first rotation limiting surfaces.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (15)