Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Reexamination Certificate
1999-03-05
2001-06-26
Schwartz, Christopher P. (Department: 3613)
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
Reexamination Certificate
active
06250614
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a vibration insulating mount which mounts a vibration object such as an engine on a mounting body such as a vehicle body while isolating vibration and particularly to a vibration insulating mount in which a fluid chamber accommodating fluid is defined by a elastic support disposed between the vibrating body and mounting body so as to change a volume of the fluid chamber actively, thereby reducing vibration transmission rate.
Japanese Patent Application Laid-Open No. H9-250590 (Japanese Patent Application No. H8-59219) discloses a vibration insulating mount having a fluid chamber accommodating fluid so as to change a volume of the fluid chamber actively.
SUMMARY OF THE INVENTION
A conventional vibration insulating mount which changes a volume of a fluid chamber actively utilizes a movable member capable of being displaced so as to change the volume of the fluid chamber. According to a consideration by the present inventors, due to physical characteristics of an actuator for displacing the movable member, it is often difficult to keep the movable member parallel to the actuator. As a consequence, the movable member comes into contact with its peripheral members.
As its countermeasure, it can be considered to simply reduce the size of the movable member so as to expand a gap relative to the peripheral parts. However, if the size of the movable member is reduced, the change in the volume of the fluid chamber is also decreased. This is not favorable for the vibration insulation characteristic of the vibration insulating mount.
Generally in some cases, an electromagnetic actuator is used to displace the movable member and a part of the movable member is constituted of a magnetic path forming member so that a magnetic force is applied to the movable member. With such a structure as well, it is needless to say that if the size of the magnetic path forming member is reduced, it is possible to prevent the movable member from coming into contact with the peripheral members. However, if the size of the magnetic path forming member is simply reduced, the degree of the change in magnetic flux in a space is also reduced, and therefore the magnetic force applied to the movable member is also reduced. Such reduction of the magnetic force applied leads to deterioration of the vibration insulation mounting characteristic, and therefore it is not favorable.
Accordingly, it becomes apparent that a vibration insulating mount having a desired characteristic cannot be achieved only by reducing the size of the movable member.
The present invention has been achieved by such a consideration by the present inventors, and an object of the present invention is to provide a vibration insulating mount capable of exerting an active vibration insulation mounting characteristic stably and securely while preventing a generation of the abnormal sound which may occur between the movable member and its peripheral components.
To achieve the above object, the present invention provides a vibration insulating mount to be disposed between a vibrating body and a mounting body, and comprising a fluid chamber filled with a fluid, an elastic support partly defining the fluid chamber and mounting the vibrating body, a movable member partly defining the fluid chamber and capable of being displaced so as to change a volume of the fluid chamber, a supporting member supporting the movable member, and an actuator opposed to the movable member and generating displacing force to displace the movable member. Here, thickness of an outer portion of the movable member is thinner than that of an inner portion of the movable member.
In other words, the vibration insulating mount of the present invention comprising fluid accommodating means accommodating a fluid, elastic mounting means mounting the vibrating body and partly defining the fluid accommodating means, volume changing means changing a volume of the fluid accommodating means and partly defining the fluid accommodating means, supporting means supporting the volume changing means, and reducing means reducing a frequency of contact between the volume changing means and the supporting means.
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Yosuke; “Vibration Control Supporting Device”; Patent Abstracts of Japan; vol. 1998, No. 01; Jan. 30, 1998; JP 09 257091;Sep. 30, 1997; Abstract.
Yosuke; “Vibro-Isolating Supporting Device”; Patent Abstracts of Japan; vol. 1998, No. 02; Jan. 30, 1998; JP 09 273585; Oct. 21, 1997; Abstract.
Akatsu Yousuke
Aoki Kazushige
Kimura Takeshi
Satou Shigeki
Bartz C. T.
Foley & Lardner
Nissan Motor Co,. Ltd.
Schwartz Christopher P.
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