Abstract: A fluid pressure control system for automatic transmission includes a fluid pressure source, a fluid pressure regulating valve for regulating the fluid from the source to a particular line pressure, and a plurality of frictional engaging devices, adapted to be actuated by the line pressure through means of a manual shift valve, for attaining a particular gear ratio within the gear trains of the transmission which are interposed between the input and output shafts. A governor valve generates a governor pressure in response to the rotational speed of the input shaft, a throttle valve generates a throttle pressure in response to the engine throttle valve, and a shift valve selectively actuates the frictional engaging devices in response to the governor and throttle pressures.

Abstract: A speed change gear system for providing at least four forward drive speed ranges and one reverse drive speed range includes two planetary gear sets of the single-pinion type and one planetary gear set of the double-pinion type, two clutches, and three brakes. As a result of the coupling and uncoupling of the clutches and brakes, the movable elements of each of the planetary gear sets are suitably coupled so as to attain the various speed ranges.

Abstract: A speed change gear system includes an input shaft, an output shaft and three planetary gear sets interposed therebetween. The first planetary gear set includes a first sun gear, a first planetary gear intermeshed with the first sun gear, a first ring gear enmeshed with the first planetary gear, and a first carrier rotatably supporting the first planetary gear while the second planetary gear set includes a second sun gear, a second planetary gear enmeshed with the second sun gear, a second ring gear intermeshed with the second planetary gear and drivingly connected to the first carrier, and a second carrier rotatably supporting the second planetary gear.

Abstract: A speed change gear system of the planetary gear type suited for applications within fluid couplings used upon automotive vehicles includes an input shaft and a first planetary gear set which includes a first sun gear, a first planetary gear engaged with the first sun gear, a first ring gear engaged with the first planetary gear, and a first carrier rotatably supporting the first planetary gear.

Abstract: A fluid pressure control system for automatic fluid transmissions includes a fluid pressure source, a fluid pressure regulating valve for regulating the fluid from the source to a particular line pressure, and a plurality of frictional engaging devices, adapted to be actuated by the line pressure through means of a manual shift valve, for attaining a particular gear ratio within the gear train of the transmission which are interposed between the input and output shafts. A governor valve generates a governor pressure in response to the rotational speed of the input shaft, a throttle valve generates a throttle pressure in response to the engine throttle valve, and a shift valve selectively actuates the frictional engaging devices in response to the governor and throttle pressures.

Abstract: A speed change gear system for providing at least four forward drive speed ranges and one reverse drive speed range includes planetary gear sets of the single-pinion type and simple planetary gear sets of the double-pinion type as well as a plurality of clutches and brakes. As a result of the coupling and uncoupling of the clutches and brakes, the movable elements of the gear sets are suitably coupled so as to attain the various speed ranges.

Abstract: Disclosed herein is a hydraulic modulator valve for a control system of a hydraulically operated mechanism having a casing with a bore therein, a stepped spool axially and slidably engaged within the bore to form an annular fluid throttle passage against the circumference of the bore between a first and a second ports drilled through the casing, and spool actuator for controlling axial displacement of the spool. The stepped spool comprises a large diameter portion to be hermetically engaged within the bore, a small diameter portion and a medium diameter portion in sequence, the throttle passage being formed by the bore and the medium and small portions of the spool.

Abstract: A speed change gear system of the planetary type suited for applications to fluid couplings utilized upon automotive vehicles includes at least first, second, and third planetary gear sets suitably interposed between an input shaft and an output shaft, first and second clutches, and first, second, and third braking means.

Abstract: Speed change gears of the planetary gear type suited for applications within fluid couplings used upon automotive vehicles includes an input shaft, a first clutch for releasing or coupling a second ring gear and a third sun gear simultaneously from or to the input shaft, a second clutch for releasing or coupling a first sun gear and a second sun gear simultaneously from or to the input shaft, a first planetary gear engaged with the first sun gear, a first ring gear engaging the first planetary gear, a first carrier rotatably supporting the first planetary gear, a second planetary gear engaged with the second sun gear and the second ring gear, a second carrier rotatably supporting the second planetary gear, a third planetary gear enmeshed with the third sun gear, a third ring gear interengaged with the third planetary gear and coupled to the first ring gear, a third carrier rotatably supporting the third planetary gear and coupled to the second carrier and to an output shaft, a first brake capable of locking t

Abstract: A hydraulic pressure regulating system for a vehicle having a regulator valve, a shift valve and a plurality of fluid actuated clutch means, wherein an accumulator being provided between the regulator valve and the shift valve is so designed as to control the fluid pressure to keep it relatively low when the fluid actuated clutch means is in its initial engagement condition and communicates with the regulator valve so as to increase the fluid pressure sufficiently to provide for the full engagement of the fluid actuated clutch means when the clutch means becomes substantially fully engaged.