| 摘要 |
An overrunning clutch is provided with a spatial wedge-shaped mechanism including a rotation guide mechanism (G) and a traction friction mechanism (F1). The traction friction mechanism (F1) has a friction member. A guide member of the rotation guide mechanism (G) preferably has a helical tooth guide surface. The rotation guide mechanism (G) and the traction friction mechanism (F1) are rigidly, axially linked by a common annular intermediate member, which has complementary guide surfaces and a rotation friction surface. The lead angle of the guide surfaces is less than the maximum value of the lead angle which is capable of ensuring self locking of the friction pairs between the guide surfaces, so that the intermediate member can be wedged between the guide member and the friction member, and then transfer torque therebetween. The invention has many advantages such as fully surface contact, a simple structure, no disperse and asymmetry rotation members, and various beneficial operating conditions can be achieved conveniently by the direction controllable scheme. |
| 主权项 |
1. A spatial wedging friction overrunning clutch, comprising:
at least one axially engaged traction friction mechanism revolving about an axis, said traction friction mechanism comprising at least one intermediate member and a friction member revolving about said axis and provided with a traction friction surface, the intermediate member and the friction member being abutted against each other in the axial direction to form at least one traction friction pair for producing and transmitting traction friction torque therebetween; at least one rotation guide mechanism, which revolves about said axis and provides engagement force to said traction friction mechanism, wherein the rotation guide mechanism includes said intermediate member and a guide member revolving about said axis and provided with a corresponding guide surface, the intermediate member and the guide member being abutted against each other in the axial direction to form a guide friction pair, wherein a lead angle λ at the abutment position of the guide friction pair is greater than zero and smaller or equal to , that is, 0<λ≦, wherein within the range of λ, a rotation tendency of the guide member relative to the friction member along two opposite circumferential directions can cause the overrunning clutch to be automatically brought into an engaged situation for transmitting torque and automatically come out of the engaged situation for overrunning respectively by means of the traction friction torque, wherein is the maximum value of the lead angle λ that enables the guide friction pair to be self-locked circumferentially. |
