Tubular antivibration device
A tubular antivibration device includes an inner axial member and an outer tubular member that are joined by an elastic rubber main body. The inner axial member is provided with a pair of groove-shaped recesses that open on the outer peripheral surface on both sides in the lateral direction and extend in the vertical direction, and the elastic rubber main body is integrally provided with a pair of upper and lower first elastic joining parts that join the vertically opposing surfaces of the inner axial member and the outer tubular member to each other on both sides in the vertical direction and a pair of left and right second elastic joining parts that join the vertically opposing surfaces of the outer tubular member to each other through the pair of groove-shaped recesses of the inner axial member.
1 . A tubular antivibration device in which an inner axial member and an outer tubular member are joined by an elastic rubber main body,
wherein the inner axial member comprises a pair of groove-shaped recesses that open on an outer peripheral surface on both sides in a lateral direction and extend in a vertical direction,
the elastic rubber main body integrally comprises a pair of upper and lower first elastic joining parts joining vertically opposing surfaces of the inner axial member and the outer tubular member to each other on both sides in the vertical direction, and a pair of left and right second elastic joining parts joining vertically opposing surfaces of the outer tubular member to each other through the pair of groove-shaped recesses of the inner axial member,
each of the second elastic joining parts has an axial length that is increased toward both outer sides in the vertical direction, and
each of the second elastic joining parts has a smallest axial length that is equal to or smaller than a groove width of one of the groove-shaped recesses.
2 . The tubular antivibration device according to claim 1 , further comprising a first hollow hole formed to penetrate one of the first elastic joining parts of the elastic rubber main body in an axial direction, and a first stopper protrusion provided on one of the vertically opposing surfaces of the inner axial member and the outer tubular member to protrude into the first hollow hole.
3 . The tubular antivibration device according to claim 1 , further comprising second hollow holes formed to penetrate in the axial direction on outer sides in the lateral direction with respect to the second elastic joining parts of the elastic rubber main body.
4 . The tubular antivibration device according to claim 3 , further comprising second stopper protrusions respectively provided on both sides of the inner axial member in the axial direction to protrude into the second hollow holes in the lateral direction,
wherein the groove-shaped recesses are provided axially between the second stopper protrusions on both sides in the axial direction.
5 . The tubular antivibration device according to claim 1 , wherein each of the groove-shaped recesses has an axial groove width that increases toward both outer sides in the vertical direction at both end portions thereof in the vertical direction, and
the elastic rubber main body comprising the second elastic joining parts is filled inside the groove-shaped recesses.
6 . The tubular antivibration device according to claim 1 , wherein the second elastic joining parts are arranged apart from a side wall inner surface of the groove- shaped recesses on an inner side thereof in a groove width direction.