| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving force transmission device superior in space efficiency while suppressing dragging torque.SOLUTION: A driving force transmission device 1 includes a housing 2 and an inner shaft 3 relatively rotatably disposed on a same shaft, a clutch 4 for connecting the housing 2 and the inner shaft 3 in a state that driving force can be transmitted, an electromagnetic coil 50 generating magnetic force by energization, an armature 51 moving to a side opposed to the clutch 4 by the magnetic force of the magnetic coil 50, a first piston 52 moving with the armature 51, a hydraulic oil L flowing in accompany with the movement of the first piston 52, and a second piston 53 axially moving to a clutch 4 side by flowing of the hydraulic oil L. The second piston 53 axially presses the clutch 4 by receiving a fluid pressure of the hydraulic oil L.SELECTED DRAWING: Figure 1 |
