US-20260126092-A1 - Vibration Isolation Mechanism

US20260126092A1US 20260126092 A1US20260126092 A1US 20260126092A1US-20260126092-A1

Abstract

An anti-vibration mount includes: an inner member for insertion of a shaft; an outer member surrounding the inner member; and a resilient body including a covering portion covering an outer peripheral surface of the inner member, a connecting portion connecting the inner member with the outer member, and a first engagement portion formed on an outer peripheral surface of the covering portion. A restricting member includes: a support for insertion of the shaft; and a resilient body formed on the support and including a facing surface with a restriction region spaced apart and facing an end surface of the outer member, a groove portion formed in the facing surface and extending along a circumferential direction of the shaft, an inner peripheral surface facing the outer peripheral surface of the covering portion, and a second engagement portion formed on the inner peripheral surface and engaging with the first engagement portion.

Inventors

Shunsuke TSUYUKI
Toi MATSUMOTO

Assignees

NOK CORPORATION

Dates

Publication Date: 20260507
Application Date: 20250715
Priority Date: 20241101

Claims (7)

1 . A vibration isolation mechanism comprising: an anti-vibration mount that includes: an inner member into which a shaft member is to be inserted; an outer member surrounding the inner member; and a first resilient body that includes a covering portion covering an outer peripheral surface of the inner member, a connecting portion connecting the inner member with the outer member, and a first engagement portion formed on an outer peripheral surface of the covering portion; and a restricting member that includes: a support member into which the shaft member is to be inserted; and a second resilient body provided on the support member, wherein the second resilient body includes a facing surface including a restriction region that is spaced apart and faces an end surface of the outer member, a groove portion formed in the facing surface and extending along a circumferential direction of the shaft member, an inner peripheral surface facing the outer peripheral surface of the covering portion, and a second engagement portion formed on the inner peripheral surface and engaging with the first engagement portion.
2 . The vibration isolation mechanism according to claim 1 , wherein the first engagement portion is an annular protrusion portion formed on the outer peripheral surface of the covering portion, and wherein the second engagement portion is an annular recess portion formed in the inner peripheral surface of the second resilient body.
3 . The vibration isolation mechanism according to claim 2 , wherein the annular protrusion portion includes, a first outer wall surface located adjacent to the support member, and a second outer wall surface located away from the support member, and wherein an inclination angle of the first outer wall surface relative to an axial direction of the shaft member is less than an inclination angle of the second outer wall surface relative to the axial direction of the shaft member.
4 . The vibration isolation mechanism according to claim 2 , wherein the annular recess portion includes, a first inner wall surface located adjacent to the support member, and a second inner wall surface located away from the support member, and wherein an inclination angle of the first inner wall surface relative to an axial direction of the shaft member is less than an inclination angle of the second inner wall surface relative to the axial direction of the shaft member.
5 . The vibration isolation mechanism according to claim 2 , wherein the groove portion is deeper, in the axial direction of the shaft member, than a bottom portion of the annular recess portion.
6 . The vibration isolation mechanism according to claim 1 , wherein the groove portion is annular and formed in the facing surface.
7 . A vibration isolation mechanism comprising: a first restricting member; a second restricting member; and an anti-vibration mount between the first restricting member and the second restricting member, wherein the anti-vibration mount includes: an inner member into which a shaft member is to be inserted; an outer member surrounding the inner member; and a first resilient body that includes a covering portion covering an outer peripheral surface of the inner member, a connecting portion connecting the inner member with the outer member, and a plurality of first engagement portions formed on an outer peripheral surface of the covering portion, wherein each of the first restricting member and the second restricting member includes: a support member into which the shaft member is to be inserted; and a second resilient body provided on the support member, wherein the second resilient body includes a facing surface including a restriction region that is spaced apart and faces an end surface of the outer member, a groove portion formed in the facing surface and extending along a circumferential direction of the shaft member, an inner peripheral surface facing the outer peripheral surface of the covering portion, and a second engagement portion formed on the inner peripheral surface, and wherein the second engagement portion of the first restricting member engages with, from among the plurality of first engagement portions, a first engagement portion located on one side of the connecting portion, and wherein the second engagement portion of the second restricting member engages with, from among the plurality of first engagement portions, a first engagement portion located on another side of the connecting portion.

Description

CROSS REFERENCE TO RELATED APPLICATION This Application is based on, and claims priority from, Japanese Patent Application No. 2024-193017, filed Nov. 1, 2024, the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to vibration isolation mechanisms. BACKGROUND A vibration isolation mechanism for reducing the transmission of vibration between a first member and a second member has been conventionally proposed. For example, Japanese Patent No. 7286009 discloses an anti-vibration bush including an upper bush and a lower bush. In the configuration of Japanese Patent No. 7286009, the lower bush is mounted to the upper bush through engagement between an annular protrusion formed on a first resilient body of the upper bush and a non-annular protrusion formed on a second resilient body of the lower bush. SUMMARY In a vibration isolation mechanism constituted by a combination of a plurality of members such as the upper bush and the lower bush in Japanese Patent No. 7286009, there is room for further improvement from the viewpoint of facilitating the work of assembling the plurality of members. In one aspect, a vibration isolation mechanism includes: (a) an anti-vibration mount that includes: (i) an inner member into which a shaft member is to be inserted; (ii) an outer member surrounding the inner member; and (iii) a first resilient body that includes (1) a covering portion covering an outer peripheral surface of the inner member, (2) a connecting portion connecting the inner member with the outer member, and (3) a first engagement portion formed on an outer peripheral surface of the covering portion; and (b) a restricting member that includes: (i) a support member into which the shaft member is to be inserted; and (ii) a second resilient body provided on the support member, in which the second resilient body includes: (1) a facing surface including a restriction region that is spaced apart and faces an end surface of the outer member, (2) a groove portion formed in the facing surface and extending along a circumferential direction of the shaft member, (3) an inner peripheral surface facing the outer peripheral surface of the covering portion, and (4) a second engagement portion formed on the inner peripheral surface and engaging with the first engagement portion. In another aspect, a vibration isolation mechanism includes: (a) a first restricting member; (b) a second restricting member; and (c) an anti-vibration mount between the first restricting member and the second restricting member, in which the anti-vibration mount includes: (i) an inner member into which a shaft member is to be inserted; (ii) an outer member surrounding the inner member; and (iii) a first resilient body that includes (1) a covering portion covering an outer peripheral surface of the inner member, (2) a connecting portion connecting the inner member with the outer member, and (3) a plurality of first engagement portions formed on an outer peripheral surface of the covering portion, each of the first restricting member and the second restricting member includes: (i) a support member into which the shaft member is to be inserted, and (ii) a second resilient body provided on the support member, the second resilient body includes: (1) a facing surface including a restriction region that is spaced apart and faces an end surface of the outer member; (2) a groove portion formed in the facing surface and extending along a circumferential direction of the shaft member; (3) an inner peripheral surface facing the outer peripheral surface of the covering portion, and (4) a second engagement portion formed on the inner peripheral surface, in which the second engagement portion of the first restricting member engages with, from among the plurality of first engagement portions, a first engagement portion located on one side of the connecting portion, and the second engagement portion of the second restricting member engages with, from among the plurality of first engagement portions, a first engagement portion located on another side of the connecting portion. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a vibration isolation mechanism according to a first embodiment. FIG. 2 is a cross-sectional view of an anti-vibration mount. FIG. 3 is an enlarged cross-sectional view of a vicinity of an annular protrusion portion in the anti-vibration mount. FIG. 4 is a plan view and a cross-sectional view of a restricting member. FIG. 5 is an enlarged cross-sectional view of a vicinity of an annular recess portion in the restricting member. FIG. 6 is an explanatory view of a step of mounting the restricting member to the anti-vibration mount. FIG. 7 is an explanatory view of the step of mounting the restricting member to the anti-vibration mount. FIG. 8 is an explanatory view of the step of mounting the restricting member to the anti-vibration mount. FIG. 9 is an explanatory view of probl