Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Reexamination Certificate
1999-11-30
2001-02-20
Schwartz, Chris (Department: 3613)
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
C267S140150
Reexamination Certificate
active
06189873
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
The entire contents of Japanese application Tokugan Hei 10-339551, with a filing date of Nov. 30, 1998 in Japan, are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a device for insulating vibrations and supporting a vibration generating means such as an engine of a vehicle, and particularly to a fluid sealed type vibration insulating device which has a fluid chamber defined by the elastic support and is arranged to sufficiently decrease a magnitude vibration input. The present invention more particularly relates to a movable plate partly defining the fluid chamber, which is displaced in the direction for changing the volume of the fluid chamber.
As one example, Japanese Patent Kokai No. 5-332392 discloses a fluid sealed type vibration insulating device which is able to generate an active supporting force. This vibration insulating device is provided with an inner cylinder fixed to one of a vibrating means and a structural member, an outer cylinder fixed to the other one of the vibrating means and the structural member while surrounding the inner cylinder, an elastic support disposed between the inner and outer cylinders, a main fluid chamber defined by the elastic support, an auxiliary fluid chamber variable in volume, an orifice communicating the main fluid chamber and the auxiliary fluid chamber, fluid sealed in the main fluid chamber, the auxiliary fluid chamber and the orifice, a movable plate displaceable in the direction for changing the volume of the main fluid chamber, and an actuator driven by the movable plate. This conventional vibration insulating device is arranged to generate a desired damping force by flowing the fluid through the orifice and to generate an active supporting force by elastically deforming an expanding directional functioning spring of the elastic support due to the displacement of the movable plate.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a vibration insulating device which can be formed by a simplified a manufacturing process and thereby decrease the manufacturing cost.
According to one aspect of the present invention, there is provided a vibration insulating device comprising: a main fluid chamber; an elastic support partly defining the main fluid chamber; fluid filled in said main fluid chamber; a movable construction part to change the volume of said main fluid chamber; an elastic plate elastically supporting said movable construction part so that said movable plate is allowed moving; an actuator to generate a displacement force for displacing said movable construction part; wherein said movable construction part comprises: a partition wall partly defining said main fluid chamber; said partition wall having a internal thread hole; a magnetic path member to get said displacement force of said actuator; said magnetic path member having a first hole; a bolt to fasten said partition wall and said magnetic path member, said bolt being inserted in said internal thread hole and said first hole; a clearance spacer to make a clearance between said partition wall and said magnetic path; wherein said bolt comprises a bolt head on a external thread, said bolt head contacting said first hole's internal surface as the bolt is inserted; wherein said bolt head pushes said first hole's internal surface until the center of the first hole is put in agreement with the center of the internal thread hole.
There is also provided a vibration insulating device interposed between a vibrating means and a vehicle body, the vibration insulating device comprising: a main fluid chamber; an elastic support partly defining the main fluid chamber; fluid filled in said main fluid chamber; a partition wall to change the volume of said main fluid chamber, said partition wall partly defining said main fluid chamber; said partition wall being formed into a disc shape having a center axis; an actuator to generate a displacement force for displacing said partition wall toward the center axis of said partition wall, said displacement force generated as a round shape which has a center axis; a magnetic path member to transmit said displacement force to said movable plate, said magnetic path member wall being formed into a disc shape having a center axis; a clearance spacer to make clearance between said partition wall and said magnetic path member, said clearance spacer being formed into a disc shape having a center axis; a seal ring elastically connected with said movable plate so that partition wall is allowed moving, said seal ring fixing so that the center axis of said partition wall is in agreement with the center axis of said displacement force; an elastic plate elastically supporting said movable plate to generate a force according to said displacement force, said elastic plate being placed said clearance; a bolt to fasten said movable plate, magnetic path member and clearance spacer; wherein said partition wall has a internal thread hole which is in the center of said partition wall; wherein said clearance spacer has a opening to be inserted said bolt, which is in the center of said clearance spacer; wherein said magnetic path member has a first hole to inserted said bolt, which is in the center of said magnetic path; wherein said bolt comprises a bolt head on a external thread, said bolt head contacting said path's hole in its hole as the bolt is inserted; wherein said bolt head pushes said magnetic path until the center of the magnetic path is put in agreement with the center of the partition wall.
REFERENCES:
patent: 5333846 (1994-08-01), Goto et al.
patent: 5718417 (1998-02-01), Aoki
patent: 5779231 (1998-07-01), Okazaki et al.
patent: 5905317 (1999-05-01), Aoki
patent: 5947456 (1999-09-01), Aoki
patent: 6032937 (2000-03-01), Kojima et al.
Foley & Lardner
Nissan Motor Co,. Ltd.
Schwartz Chris
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