Cylindrical antivibration device for motor mount

Patent metadata

Field	Value
Publication number	US-12000452-B2
Application number	US-202117226089-A
Country	US
Kind code	B2
Filing date	Apr 9, 2021
Priority date	Feb 28, 2019
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

Provided is a cylindrical antivibration device for a motor mount mounted between an electric motor for driving and support members in an automobile, the cylindrical antivibration device having an inner shaft member and an outer cylinder member which are coupled by a body rubber elastic element, in which surfaces of the inner shaft member and the outer cylinder member that face each other in a direction perpendicular to the shaft are continuously coupled over the entire circumference via the body rubber elastic element. On an axial end surface of the body rubber elastic element, an elastic protrusion, that protrudes outward in the axial direction and extends circumferentially in an intermediate portion between the facing surfaces of the inner shaft member and the outer cylinder member, is formed integrally with the body rubber elastic element.

First claim

The invention claimed is:

1. A cylindrical antivibration device for a motor mount, which is configured such that an inner shaft member and an outer cylinder member are connected to each other by a body rubber elastic element and is mounted between an electric motor for driving of a vehicle and a support member, wherein
facing surfaces of the inner shaft member and the outer cylinder member in a direction perpendicular to a shaft are continuous over an entire circumference in a circumferential direction and are connected to each other by the body rubber elastic element, and
an elastic protrusion that protrudes outward in an axial direction at an intermediate portion between the facing surfaces of the inner shaft member and the outer cylinder member and extends in the circumferential direction is formed integrally with the body rubber elastic element on an end face of the body rubber elastic element in the axial direction;
wherein
a protrusion height of the elastic protrusion is set as T, and a length of the body rubber elastic element in the axial direction is set as L,
0.1≤L≤T≤L is satisfied;
wherein
a thickness dimension of the elastic protrusion is set as W, and a thickness dimension of the body rubber elastic element is set as R,
0.1 R≤W≤0.8 R is satisfied.

2. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
the elastic protrusion is an annular elastic protrusion provided continuously over an entire circumference of the body rubber elastic element in the circumferential direction.

3. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
both end faces of the body rubber elastic element in the axial direction are configured as tapered inclined surfaces by a dimension of the body rubber elastic element in the axial direction gradually decreasing toward a side of the outer cylinder member from a side of the inner shaft member, and
the elastic protrusion protrudes from the tapered inclined surface of the body rubber elastic element.

4. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
a protrusion height of the elastic protrusion protruding from a surface of the body rubber elastic element is smaller than a length of the body rubber elastic element in the axial direction.

5. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
a thickness dimension of the elastic protrusion of the body rubber elastic element in the direction perpendicular to the shaft is ⅓ or less of a thickness dimension of the body rubber elastic element.

6. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
a thickness dimension of the elastic protrusion of the body rubber elastic element in the direction perpendicular to the shaft decreases toward a tip end side from a base end side of the elastic protrusion.

7. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
a main input direction of antivibration target vibration applied between the inner shaft member and the outer cylinder member is one direction of the direction perpendicular to the shaft, and
the elastic protrusion is present on at least both sides in the direction perpendicular to the shaft orthogonal to the main input direction of the antivibration target vibration and extends in the circumferential direction.

8. The cylindrical antivibration device for a motor mount according to claim 1 , wherein
an electric motor for driving of a battery-driven electric vehicle is antivibration-supported,
the body rubber elastic element has a peak of an absolute spring constant due to surging in a frequency range of 500 Hz to 1000 Hz,
a secondary resonance point in the elastic protrusion is set to be in a frequency range lower than the peak of the absolute spring constant due to the surging of the body rubber elastic element, and
the peak of the absolute spring constant due to the surging of the body rubber elastic element is reduced on the basis of an elastic deformation action of the elastic protrusion having a phase difference from the body rubber elastic element by providing the elastic protrusion.

Assignees

• Sumitomo Riko Co Ltd

Inventors

• Abe Junji

Classifications

• F16F15/08 Primary

  with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)} · CPC title

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• F16F2224/025

  Elastomers · CPC title

• F16F2230/0005

  Attachment, e.g. to facilitate mounting onto confer adjustability · CPC title

• F16F2234/02

  cylindrical · CPC title