| 摘要 |
An appparatus for forming a machined epitrochoidal surface comprising a body structure supporting an orbitally movable carrier constrained to an epitrochoidal orbit determined by the meshing of a stationary base gear and an orbital gear of annular form driven by an eccentric, at least one tool holder being driven by the carrier along an epitrochoidal path while the angular relationship between a working face of the tool and the path along which it is moved is determined by a guide member carried round with the assembly of carrier, driving eccentric, and tool holder and having engagement with this assembly at two locations, the first of which is coaxial with a moving instantaneous centre defined by the point of contact or meshing between the base and orbiting gears, and the other of which is coaxial with a pivotal axis about which the tool holder can move and which passes through the point of engagement between the working face of the tool and a workpiece, slide and slideway means being provided in association with the guide member at one of these locations to enable the carrier to accommodate the changing distance between said two locations. |
