초록 ▼

A speed control system includes a pair of rotatable plates having at least one power transmission roller positioned in a toroidal track formed by annular grooves in the plates. Each plate is received within a rotatable housing to which it is drivingly connected by means of a cooperating track follow

A speed control system includes a pair of rotatable plates having at least one power transmission roller positioned in a toroidal track formed by annular grooves in the plates. Each plate is received within a rotatable housing to which it is drivingly connected by means of a cooperating track follower and helical track so that the plate rotates with the associated housing but is free to move axially relative thereto in a screw-like motion. One housing is driven by an engine and its plate drives the other plate by means of the power transmission roller. The roller is mounted on a carrier pivotally mounted about an axis which is substantially normal to the axis of rotation of the plates and is offset from the center of the roller so that, on axial displacement of the plates, the carrier pivots so that the positions of engagement between the roller and the respective grooves change thus effecting a change in relative angular velocity of the plates. The plates are biased towards each other and into engagement with the roller by fluid under pressure in an expansible chamber associated with one of the plates and by a spring acting on the other plate. The pressure in the expansible chamber is controlled in response to the rotational speed of one of the plates.

대표청구항 ▼

A speed control system comprising co-axially mounted driven and driving plates having opposed annular grooves co-axial with the plates, said opposed grooves forming a generally toroidal track, a power transmitting roller mounted and running within the track, said roller being rotatable about an axis

A speed control system comprising co-axially mounted driven and driving plates having opposed annular grooves co-axial with the plates, said opposed grooves forming a generally toroidal track, a power transmitting roller mounted and running within the track, said roller being rotatable about an axis which lies substantially in a plane containing the axis of rotation of said driven and driving plates and engaging within each of the opposed grooves so that on rotation of said driving plate in one direction power is transmitted therefrom through the roller to rotate said driven plate in the opposite direction, a system part which is restrained from axial displacement, said driven and driving plates being axially displaceable relative to said system part, a carrier supporting said roller, said carrier being pivotally mounted about an axis which is substantially normal to said plane containing the axis of rotation of said driven and driving plates and offset from the center of said roller so that on axial displacement of said driven and driving plates said carrier can pivot to displace radially relative to the axis of rotation of said driven and driving plates the positions of engagement between the roller and the respective grooves to effect a change in ratio of angular velocity at which said driving plate is driven relative to said driven plate, means biasing said driven and driving plates toward each other and into engagement with said roller, one of said driven and driving plates being biased towards the other plate and into engagement with said roller by fluid under pressure in an expansible chamber associated with said one of said driving and driven plates, valve means for controlling the admission of fluid to and the exhausting of fluid from said expansible chamber, said valve means being responsive to the speed of rotation of either said driven or driving plate so that said valve means is controlled in accordance with variations in rotational speed of either said driven or driving plate to which it is responsive to cause an adjustment in fluid pressure in the expansible chamber and thereby displacement of said one of said driven and driving plates and a variation in the ratio at which drive is transmitted through the system between said driven and driving plates.