Abstract: An antivibration device is equipped with an inner sleeve having a diameter expansion portion, an outer sleeve, an antivibration base body, and an annular stopper. The stopper is equipped with a first portion where a first distance from the center of the attaching hole to an inner peripheral surface of the attaching hole is set to be smaller than a maximum value of an outer radius of the diameter expansion portion, and a second portion where a second distance from the center to the inner peripheral surface of the attaching hole is set to be larger than the first distance.

Abstract: The present invention has an object to provide a vibration isolation device in which stress added to an adhesion layer of a vibration isolation body at enlargement of an inner pipe can be made small and a spring constant in an axis direction can be increased. A vibration isolation body which is enlarged as going toward a first end surface of an inner pipe and an enlarged portion with non-adhesion state are formed in the inner pipe. A flection portion bent toward an outer side in a radial direction by bending an end portion in the axis direction at a side of the enlarged portion in an outer pipe is formed in the outer pipe. A stopper portion protruded toward the enlarged portion from a clearance between the inner pipe and the outer pipe and the flection portion is formed in the vibration isolation body.

Abstract: The present invention has an object to provide a vibration isolation device through which it can be restrained that abnormal sound occurs when the inner pipe relatively displaces against the outer pipe. The stopper portion has the communication passage communicating the space between the inner circumference side of the stopper portion and the inner pipe with outside when the inner pipe relatively displaces against the outer pipe. Thereby, even if volume of the space changes when the inner pipe relatively displaces against the outer pipe, communication of air between the space and outside is secured through the communication passage, therefore it can be restrained that atmospheric pressure within the space changes. Thus, since it can be restrained that the stopper portion closely contacts with the enlarged portion, it can be restrained that abnormal sound occurs when the inner pipe relatively displaces against the outer pipe.

Abstract: An antivibration device is equipped with an inner sleeve having a diameter expansion portion, an outer sleeve, an antivibration base body, and an annular stopper. The stopper is equipped with a first portion where a first distance from the center of the attaching hole to an inner peripheral surface of the attaching hole is set to be smaller than a maximum value of an outer radius of the diameter expansion portion, and a second portion where a second distance from the center to the inner peripheral surface of the attaching hole is set to be larger than the first distance.

Abstract: The present invention has an object to provide a vibration isolation device in which a spring constant in an axis direction can be increased. An enlarged portion with a tapered shape as going to a first end surface of an inner pipe is formed in the inner pipe and a stopper portion protruded toward the enlarged portion from a clearance between the inner pipe and an outer pipe is formed in a vibration isolation body. A slanted surface corresponding to a surface to which force is added from the enlarged portion is formed in the stopper portion and the slanted surface is formed in a shape corresponding to a shape of an outer peripheral surface of the enlarged portion in the axis direction. As a result, there is an effect that the spring constant in the axis direction can be increased.

Abstract: The present invention has an object to provide a vibration isolation device in which stress added to an adhesion layer of a vibration isolation body at enlargement of an inner pipe can be made small and a spring constant in an axis direction can be increased. A vibration isolation body which is enlarged as going toward a first end surface of an inner pipe and an enlarged portion with non-adhesion state are formed in the inner pipe. A flection portion bent toward an outer side in a radial direction by bending an end portion in the axis direction at a side of the enlarged portion in an outer pipe is formed in the outer pipe. A stopper portion protruded toward the enlarged portion from a clearance between the inner pipe and the outer pipe and the flection portion is formed in the vibration isolation body.