Dog clutch mechanism.

摘要

A dog clutch mechanism (10) for use as a clutch for switching drive power in a four-wheel-drive vehicle has a case, first and second rotatable shafts (1, 2) rotatably supported coaxially in the case for transmitting a relative torque between front and rear wheels of the vehicle, and a dog clutch (10) comprising a dog piece (4) having first dog teeth (42) and fixedly mounted on the first rotatably shaft and a hub (5) having second dog teeth (52) capable of axially meshing with the first dog teeth (42) and axially slidably mounted on the second rotatable shaft, the dog clutch means (10) being selectively engageable for transmitting the relative torque between the first and second rotatable shafts (1, 2). The first and second dog teeth (42, 52) having respective meshing tapered surfaces for producing thrust forces acting on the hub and tending to move the hub (5) in a direction away from the dog piece (4) when the vehicle is braked while a relative forward torque is being transmitted between the first and second rotatable shafts (1, 2) through the dog clutch means (10).