Damper apparatus
A damper apparatus according to an embodiment includes a pair of first plates, a second plate, an elastic member, a first friction material and a second friction material. The elastic member is configured to elastically deform in a circumferential direction of a rotation axis by a relative rotation between the pair of first plates and the second plate around the rotation axis. The first friction material is configured to generate a first friction torque in a case where the second plate rotates relative to the pair of first plates in a first direction from an initial state. The second friction material is configured to generate a second friction torque greater than the first friction torque in a case where the second plate rotates relative to the pair of first plates in a second direction which is opposite from the first direction from the initial state.
1. A damper apparatus comprising:
a pair of first plates arranged at a position where the pair of first plates is away from each other in an axial direction of a rotation axis, the pair of first plates being configured to be rotatable around the rotation axis in a state where the pair of first plates intersects with the rotation axis;
a second plate including a portion which is positioned at an inner side of the pair of first plates and configured to be rotatable around the rotation axis in a state where the second plate intersects with the rotation axis;
an elastic member elastically deforming in a circumferential direction of the rotation axis by a relative rotation between the pair of first plates and the second plate around the rotation axis;
a first friction material generating a first friction torque in a case where the second plate rotates relative to the pair of first plates in a first direction;
a second friction material generating a second friction torque greater than the first friction torque in a case where the second plate rotates relative to the pair of first plates in a second direction which is opposite from the first direction;
a third plate arranged between the first friction material and the second friction material and configured to be rotatable around the rotation axis in a state where the third plate intersects with the rotation axis;
the second plate and the third plate being inhibited from integrally rotating with each other and the first friction torque being generated by a friction of the first friction material when the second plate rotates relative to the pair of first plates in the first direction; and
the second plate and the third plate integrally rotating with each other and the second friction torque being generated by a friction of the second friction material when the second plate rotates relative to the pair of first plates in the second direction.
2. The damper apparatus according to claim 1 , wherein the first friction material is arranged between the third plate and the second plate and the second friction material is arranged between the third plate and the pair of first plates,
the second plate and the third plate are inhibited from integrally rotating each other and the first friction torque is generated by a friction between the first friction material and the second plate each other in a case where the second plate rotates relative to the pair of first plates in the first direction,
the second plate and the third plate integrally rotate each other and the second friction torque is generated by a friction between the second friction material and the third plate each other in a case where the second plate rotates relative to the pair of first plates in the second direction.
3. The damper apparatus according to claim 2 , wherein the third plate includes a pair of third plates provided at opposite sides of the second plate in the axial direction of the rotation axis, the first friction material includes a pair of first friction materials provided at opposite sides of the second plate in the axial direction of the rotation axis, and the second friction material includes a pair of second friction materials provided at the opposite sides of the second plate in the axial direction of the rotation axis.
4. The damper apparatus according to claim 3 , wherein the pair of third plates is connected in a state being away from each other in the axial direction by a connecting member including an axially extending portion, and an opening portion including an end surface at an inner side is formed at a portion of the second plate facing the connecting member, the end surface being contactable with the axially extending portion of the connecting member.
5. The damper apparatus according to claim 1 , further comprising:
a fourth plate configured to rotate integrally with the pair of first plates around the rotation axis, the fourth plate including a portion positioned at an outer side in a radial direction of the rotation axis relative to the elastic member; and
a torque limiter portion connected to a portion of the second plate, the portion being positioned at the outer side in the radial direction relative to the elastic member.