Toyoda Gosei Co., Ltd.

Hiroaki Kawahara

Takashi Maeno

Tetsuo Asano

Kyouichi Fujinami

A method for producing a cylindrical bushing with hydraulic damping includes the steps of preparing an internal ring having an elliptical cross-section including a major axis and a minor axis, disposing within the internal ring a vibration-damping rubber block through which an inner cylinder coaxially penetrates and which has wall portions for defining a liquid chamber, so that the wall portions extend along the minor axis of the internal ring; deforming the internal ring so as to have a circular cross-section; and press-fitting the deformed internal ring into an outer cylinder.

Method for producing cylindrical bushing with hydraulic damping

A vibration-damping device with hydraulic damping has a base body, a cylindrical holder secured to the base body, and an outer cylinder press-fitted within the cylindrical holder. A vibration-damping rubber body provided with a main liquid chamber enclosing a damping liquid is disposed within the outer cylinder, and retains an inner cylinder. A thin rubber wall is disposed between the outer cylinder and the vibration-damping rubber body, and defines an auxiliary liquid chamber with the vibration-damping rubber body. This auxiliary liquid chamber communicates with the main liquid chamber by way of a throttled passageway. The cylindrical holder has a rib-like projection which radially outwardly project therefrom, and extends in a circumferential direction thereof. This projection defines a groove along an inner surface of the cylindrical holder. This groove communicates with a space defined by the outer cylinder and the thin rubber wall by way of a through hole formed in the outer cylinder, whereby the thin rubber wall freely deforms due to the flow of the damping liquid from the main liquid chamber to the auxiliary liquid chamber, and accordingly, effective vibration-damping operation can be performed.

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Nagoya, Japan

Hiroaki Kawahara