초록 ▼

The present invention employs a hydraulically operable piston and intermediate member to control two clutches in a first planetary gear set. The first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier and an inner ring gear. The first planet carrier includes a

The present invention employs a hydraulically operable piston and intermediate member to control two clutches in a first planetary gear set. The first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier and an inner ring gear. The first planet carrier includes a gear which drives a second planetary gear set resulting in rotation of a wheel hub. With hydraulic pressure applied to the piston and the intermediate member a first clutch is engaged locking an inner ring gear to a stationary outer ring effecting a high ratio reduction. With no hydraulic pressure applied to the piston and intermediate member a second clutch engages the first sun gear and the first planet carrier locking them together such that the first sun gear, first planet gear, first planet carrier and inner ring gear rotate in unison effecting a low ration reduction. With no hydraulic pressure applied, the first clutch is not engaged.

대표청구항 ▼

A two-speed vehicle transmission comprising an inner internal ring gear and a stationary outer ring, said stationary outer ring includes first and second shoulders, a first sun gear a plurality of first planet gears and a first planet carrier, said first planet carrier being generally cylindrically

A two-speed vehicle transmission comprising an inner internal ring gear and a stationary outer ring, said stationary outer ring includes first and second shoulders, a first sun gear a plurality of first planet gears and a first planet carrier, said first planet carrier being generally cylindrically shaped, a first clutch operable between said inner internal ring gear and said outer ring, said first clutch having a first set of plates for engagement with said outer ring and a second set of plates for engagement with said inner internal ring gear, a second clutch operable between said first sun gear and said first planet carrier, said second clutch having a first set of plates for engagement with said first planet carrier and a second set of plates for engagement with said first sun gear, a piston hydraulically moveable between first and second positions, an intermediate member hydraulically moveable between first and second positions, said piston being generally cylindrically shaped and having an interior and an exterior, said piston having first and second end portions, said second end portion of said piston terminating in a planar face, said first end portion of said piston engaging said first clutch, said intermediate member having first and second end portions and an intermediate portion, said intermediate member having a shoulder on said intermediate portion thereof, said planar face of said piston and said shoulder on said intermediate portion of said intermediate member having approximately equal surface areas, said piston having a first shoulder on said exterior thereof, said piston having a second shoulder on said interior thereof, a spring, said first end portion of said intermediate member having a spring stop affixed thereto, said spring disposed between said second shoulder of said piston and said spring stop, a bearing, said bearing residing between said intermediate member and said second clutch, said first shoulder of said piston engages said first shoulder of said stationary outer ring and said second clutch locks said first sun gear and said first planet carrier together when said piston and said intermediate member are in their respective first positions with no hydraulic pressure applied to said face of said piston and said shoulder of said intermediate member, and, said second shoulder of said intermediate member engages said second shoulder of said stationary outer ring and said first clutch locks said inner ring gear and said outer ring together and said second clutch unlocks said first planet carrier and said first sun gear when said piston and said intermediate member are in their respective second positions with hydraulic pressure applied to said face of said piston and said shoulder of said intermediate member.