Rubber stopper

1. A rubber stopper configured to be mounted onto a stopper part of a vibration damping device, the stopper part being adapted to limit an amount of deformation of the vibration damping device and having a mounting hole, the rubber stopper comprising:

a stopper main body to be overlapped on an abutting face of the stopper part; and

at least one mounting leg projecting from the stopper main body to a side of the abutting face of the stopper part, the mounting leg being configured to be inserted into the mounting hole of the stopper part, wherein

the mounting leg includes a neck to be positioned within the mounting hole, a protrusion to pass through the mounting hole and project to be positioned on a side of a back surface of the stopper part, and a detent positioned between the neck and the protrusion, the detent having an outer peripheral surface enlarged from the protrusion toward the neck and being configured to be detained with the back surface of the stopper part, and

the detent includes at least one notched part where an outside diameter of the detent is made small, the notched part being provided partially in a circumferential direction of the detent.

2. The rubber stopper according to claim 1 , wherein a diameter dimension of a bottom part of the notched part of the detent is not smaller than a diameter dimension of the neck.

3. The rubber stopper according to claim 1 , wherein in a lengthwise direction of the mounting leg, the notched part of the detent extends from a neck-side end face of the detent in the lengthwise direction of the mounting leg, and the notched part has a length that does not reach the protrusion.

4. The rubber stopper according to claim 1 , wherein the notched part of the detent has a groove shape extending in a lengthwise direction of the mounting leg with a cross sectional shape expanding toward the outer peripheral surface of the detent.

5. The rubber stopper according to claim 1 , wherein the notched part of the detent is provided such that the notched part is positioned on at least one of opposite sides in a direction orthogonal to a direction in which a main load acts in a planar direction of the stopper main body.

6. The rubber stopper according to claim 5 , wherein the at least one notched part of the detent comprises a pair of notched parts, and the notched parts are positioned on the opposite sides in the direction orthogonal to the direction in which the main load acts in the planar direction of the stopper main body.

7. The rubber stopper according to claim 1 , wherein

the at least one mounting leg comprises a pair of mounting legs that are positioned and opposed to each other on opposite sides in a direction in which a main load acts in a planar direction of the stopper main body, and

the detent of each mounting leg includes the notched part having a prescribed circumferential width on a corresponding one of inner sides of the mounting legs that are opposed to each other.

8. The rubber stopper according to claim 1 , wherein the mounting leg is situated away from a position where the stopper main body is configured to be abutted by the vibration damping device.

9. The rubber stopper according to claim 1 , wherein the stopper main body includes a plurality of recessed grooves on a surface thereof, the recessed grooves extending in a direction orthogonal to a direction in which a main load acts in a planar direction of the stopper main body.