Patent ID: 8398492
Filing Date: 2013-03-19
Classification: F16F

Abstract:
1. A damper arranged in a torque transmission path that transmits torque from a power source to an output member rotated about a predetermined axis, the damper comprising: a housing rotated about the axis and including a first cover and a second cover arranged along the axis, in which the first and second covers are joined to form a liquid accommodation chamber which accommodates a liquid; a damper device arranged in the liquid accommodation chamber and capable of absorbing torque fluctuation transmitted through the housing; a limiter mechanism arranged in the liquid accommodation chamber and including an input side portion located at an input side of the torque transmission path, an output side portion arranged opposing the input side portion and located at an output side of the torque transmission path, and a limiter biasing member which applies a biasing force to at least one of the input side portion and the output side portion in a direction that the input side portion and the output side portion approach each other; and a separation restriction member arranged in the liquid accommodation chamber, in which the separation restriction member restricts relative movement of the first cover and the second cover caused by the biasing force from the limiter biasing member in a direction that separates the first cover and second cover from each other, the separation restriction member includes an annular first plate arranged on one side of the limiter mechanism in the axial direction and a second plate arranged on the other side of the limiter mechanism in the axial direction, the first and second plates respectively include first and second base portions located on an inner side in a radial direction of the separation restriction member that is orthogonal to the axis and first and second restriction portions located on an outer side in the radial direction, the first and second restriction portions being arranged so as to maintain the distance therebetween, the limiter mechanism being arranged between the first and second restriction portions; a hysteresis mechanism arranged in the liquid accommodation chamber, in which the hysteresis mechanism is configured to function when a rotation difference of the housing and the output member in a rotation direction about the axis becomes equal to a predetermined rotation difference, the hysteresis mechanism being arranged inward from the damper device and the limiter mechanism in a radial direction of the damper that is orthogonal to the axis; and a cylindrical coupling member coupled to the output member in the housing in a manner integrally rotatable with the output member, wherein, the first plate is arranged on a circumferential side of the coupling member and supported by the coupling member in a state integrally rotatable with the coupling member, the coupling member includes a flange arranged at a position separated from the first plate in the axial direction along the axis and arranged to form an installation space between the flange and the first plate in the axial direction; the hysteresis mechanism includes a friction generation unit, which is arranged in the installation space, and a rotation unit, which is rotated with the housing by torque transmitted from the housing when a rotation difference between the housing and the output member becomes equal to the predetermined rotation difference; and the friction generation unit is configured to generate frictional force with the rotation unit that suppresses rotation of the rotation unit when the rotation unit rotates with the housing.