A transmission having hydraulic components including a hydrostatic unit with a variable displacement component having a hydraulic displacement control with a lubrication circuit for the components and a charge circuit for supplying fluid under pressure. First and second pumps are connected in series, with the first pump having a larger volume than the second pump to provide fluid to the second pump and to a lubricating circuit. A fluid line connects between the charge circuit and the lubrication…

An improved change gear system having a plurality of spaced countershafts having parallel axes and means supporting the countershafts in a casing for rotation. Countershaft gears are provided on the countershafts and are concentric and rotatable therewith. A rotatable main shaft is provided which is arranged substantially parallel with the countershafts and is preferably located between a pair of the countershafts. Means are provided for pivotally supporting one end of the main shaft in addition…

A transmission including a compact die cast aluminum housing having a steel support sleeve secured thereto by crimping to the housing forward wall, a countershaft assembly including a cluster gear countershaft and a flexible countershaft extension, and a shift control linkage assembly providing rotary and axial shift rail movement resulting in a desirable shift pattern.

A planetary transmission for selectively shifting among three forward and one reverse speeds includes first and second sun gears respectively secured to and clutchable to a drive shaft to provide a first forward speed. A planet carrier, secured to a driven shaft, surrounds the sun gears and carries a first planet gear meshing with the first sun gear and a compound planet gear comprising a second planet gear meshing with the first planet gear and a third planet gear meshing with the second sun ge…

A planetary transmission for selectively shifting among four forward speeds includes a first ring gear secured to a drive shaft. The first ring gear drives a compound planetary gear set which is journaled on a driven-shaft-connected planet carrier. A first planet gear set of the compound planetary gear set meshes with a carrier-journaled, third planet gear set which meshes in turn with a second ring gear. The first planet gear set further meshes with a first sun gear which is concentric with the…

A transmission includes a planetary gear unit, the carrier of which is connected to an outer race of a one-way brake. A member is constructed of a hub part formed with the inner race of the one-way brake, a cylindrical part splined to a transmission casing and means securing the parts with each other. The cylindrical part is made of the same material as that of the casing.

A variable speed ratio transmission wherein conventional pneumatic tires caused to orbit around an annular track to transmit motive forces from the input mechanism to the output mechanism. The tire planes are adjustable relative to the track plane to provide varying roll-skid engagement relationships, and different speed ratios.

A planetary transmission for selectively shifting among four forward speed ratios includes a first ring gear secured to a drive shaft and encircling a single planet carrier which is secured to the driven shaft. The first ring gear meshes with a carrier journaled first planet gear set which meshes with a driven shaft-encircling first sun gear. The first planet gear set further meshes with a carrier journaled second planet gear set which has integrally connected thereto a third planet gear set. Th…

An automatic transmission providing variable speed ratio and reverse drives between drive and driven shafts and including friction-engaging devices, in the form of friction clutches and brakes, for establishing the drives. The devices are operable by hydraulic servomotors, certain servomotors each having first and second pistons arranged in tandem, with the first piston being movable by hydraulic fluid to engage the associated friction device, the second piston being movable by hydraulic fluid t…

An automatic transmission providing variable speed ratio and reverse drives between drive and driven shafts and including friction-engaging devices, in the form of friction clutches and brakes, for establishing the drives. The devices are operable by hydraulic servomotors, certain servomotors each having first and second pistons arranged in tandem, with the first piston being movable by hydraulic fluid to engage the associated friction device, the second piston being movable by hydraulic fluid t…