| 主权项 |
1. A vibration damper, comprising:
a rotary member which rotates with a predetermined central axis as a center of rotation; and at least two inertial masses which are disposed side-by-side on the rotary member, in a circumferential direction of the rotary member, at locations separated apart on an outer side in a radial direction from the central axis of the rotary member, wherein the rotary member has a first through-hole having an inner surface that is convex toward the outer side in the radial direction, a second through-hole which is adjacent to the first through-hole in the circumferential direction, and has an inner surface that is convex toward the outer side in the radial direction, a third through-hole which is formed on an opposite side in the circumferential direction of the first through-hole, sandwiching the second through-hole between the first through-hole and the third through-hole, and has an inner surface that is convex toward the outer side in the radial direction, and a fourth through-hole which is adjacent to the third through-hole in the circumferential direction, and has an inner surface that is convex toward the outer side in the radial direction, formed therein, a first inertial mass of the two inertial masses has a fifth through-hole having an inner surface that is convex toward an inner side in the radial direction, and a sixth through-hole which is adjacent to the fifth through-hole in the circumferential direction, and has an inner surface that is convex toward the inner side in the radial direction, formed therein, a second inertial mass of the two inertial masses has a seventh through-hole having an inner surface bulged toward the inner side in the radial direction, and an eighth through-hole which is adjacent to the seventh through-hole in the circumferential direction, and has an inner surface that is convex toward the inner side in the radial direction, formed therein, the first inertial mass is disposed such that at least a portion of the fifth through-hole and a portion of the sixth through-hole overlap the first through-hole and the second through-hole respectively, a first pin that is to be pinched between the inner surface of the fifth through-hole and the inner surface of the first through-hole is inserted into the fifth through-hole and the first through-hole, and a second pin that is to be pinched between the inner surface of the sixth through-hole and the inner surface of the second through-hole is inserted into the sixth through-hole and the second through-hole, and held to be capable of undergoing pendulum movement with respect to the rotary member by the first pin and the second pin, the second inertial mass is disposed such that at least a portion of the seventh through-hole and a portion of the eighth through-hole overlap the third through-hole and the fourth through-hole respectively, a third pin that is to be pinched between the inner surface of the seventh through-hole and the inner surface of the third through-hole is inserted into the seventh through-hole and the third through-hole, and a fourth pin that is to be pinched between the inner surface of the eighth through-hole and the inner surface of the fourth through-hole is inserted into the eighth through-hole and the fourth through-hole, and held to be capable of undergoing pendulum movement with respect to the rotary member by the third pin and the fourth pin, a distance between a center of curvature of the inner surface of the first through-hole and a center of curvature of the inner surface of the second through-hole is shorter than a distance between a center of curvature of the inner surface of the fifth through-hole and a center of curvature of the inner surface of the sixth through-hole, and a distance between a center of curvature of the inner surface of the third through-hole and a center of curvature of the inner surface of the fourth through-hole is longer than a distance between a center of curvature of the inner surface of the seventh through-hole and a center of curvature of the inner surface of the eighth through-hole. |
