Center bearing support
A center bearing support ( 1 ) is provided which prevents a vibration absorbing function from being lowered on the basis of an increase of a dynamic spring constant by a resonance of an elastic body ( 13 ), at the time of an input of a vibration of a propeller shaft and a vibration. An inner periphery of an outer ring ( 11 ) fixed to a vehicle body side is provided with an inner ring ( 12 ) retaining a center bearing ( 2 ) via the elastic body ( 13 ) formed as a bent shape which is convex to one side in an axial direction and made of a rubber-like elastic material, the elastic body ( 13 ) has flexible portions ( 132, 133 ) in an inner diameter side and an outer diameter side than the bent portion ( 131 ) as a spring, and a resonance frequency thereof is equal to or more than 1500 Hz.
1. A center bearing support comprising:
an outer ring fixed to a vehicle body;
an inner ring provided on an inner periphery of the outer ring, the inner ring retaining an outer race of a center bearing; and
an elastic body connected between the inner and outer rings, the elastic body having a bent shape which is convex to one side in an axial direction, an outer peripheral end portion connected to the outer ring, an inner peripheral end portion connected to the inner ring, and made of elastomeric material,
wherein said elastic body has an intermediate bent portion, a first flexible portion on an inner diameter side of the bent portion connecting the bent portion to the inner peripheral end portion, and a second flexible portion on an outer diameter side of the bent portion connecting the bent portion to the outer peripheral end portion, and
wherein an orthogonal cross-sectional thickness of the bent portion relative to a tangent of the bent portion is t1, a maximum orthogonal cross-sectional thickness of each of the first and second flexible portions relative to an extension direction of each of the first and second flexible portions is t2, and t1<t2/2.
2. A center bearing support comprising:
an outer ring fixed to a vehicle body;
an inner ring provided on an inner periphery of the outer ring, the inner ring retaining an outer race of a center bearing; and
an elastic body connected between the inner and outer rings, the elastic body having a bent shape which is convex to one side in an axial direction, an outer peripheral end portion connected to the outer ring, an inner peripheral end portion connected to the inner ring, and made of elastomeric material,
wherein said elastic body has a thickness that is tapered toward an intermediate bent portion from both a first flexible portion on an inner diameter side of the bent portion connecting the bent portion to the inner peripheral end portion and a second flexible portion on an outer diameter side of the bent portion in the diametrical direction connecting the bent portion to the outer peripheral end portion,
wherein an orthogonal cross-sectional thickness of said bent portion relative to a tangent of the bent portion is t1, a maximum orthogonal cross-sectional thickness of the first and second flexible portions respectively on the inner diameter side and the outer diameter side of the bent portion relative to an extension direction of each of the first and second flexible portions is t2, and t1<t2/2, and
wherein the first flexible portion forms an angle α with respect to a virtual axial cylinder surface centered on a rotational axis O of the center bearing, the second flexible portion forms an angle β with respect to the virtual axial cylinder surface, α and β are each less than 90 degrees, and α+β is larger than 50 degrees.