Abstract: A vehicle planetary gear device including a sun gear, a carrier, a ring gear, a clutch drum, clutch plates axially slidably fitted in the drum, a backing plate fixedly disposed in the drum on one side of a series of clutch plates, and a piston axially movable fitted in the drum and disposed on the other side of the series of clutch plates, and wherein the ring gear is fixedly fitted in the drum with its engaging teeth held in engagement with engaging grooves of the drum, and only two retainer rings are fixed on the drum and disposed on opposite sides of the ring gear and in contact with the teeth of the ring gear, or at least one retainer ring is fixed on the drum and disposed in contact with the teeth of one-piece member consisting of the ring gear and the backing plate, whereby axial movements of the backing plate and the ring gear relative to the drum are prevented by the two retainer rings or the at least one retainer ring.

Abstract: A vehicle planetary gear device including a sun gear, a carrier, a ring gear, a clutch drum, clutch plates axially slidably fitted in the drum, a backing plate fixedly disposed in the drum on one side of a series of clutch plates, and a piston axially movable fitted in the drum and disposed on the other side of the series of clutch plates, and wherein the ring gear is fixedly fitted in the drum with its engaging teeth held in engagement with engaging grooves of the drum, and at least one retainer ring is fixed on the drum and disposed in contact with the teeth of one-piece member consisting of the ring gear and the backing plate, whereby axial movements of the backing plate and the ring gear relative to the drum are prevented by the at least one retainer ring.

Abstract: A vehicle planetary gear device including a sun gear, a carrier, a ring gear, a clutch drum, clutch plates axially slidably fitted in the drum, a backing plate fixedly disposed in the drum on one side of a series of clutch plates, and a piston axially movable fitted in the drum and disposed on the other side of the series of clutch plates, and wherein the ring gear is fixedly fitted in the drum with its engaging teeth held in engagement with engaging grooves of the drum, and only two retainer rings are fixed on the drum and disposed on opposite sides of the ring gear and in contact with the teeth of the ring gear, or at least one retainer ring is fixed on the drum and disposed in contact with the teeth of one-piece member consisting of the ring gear and the backing plate, whereby axial movements of the backing plate and the ring gear relative to the drum are prevented by the two retainer rings or the at least one retainer ring.

Abstract: A method and apparatus for controlling a power transmitting system for an automotive vehicle, including a continuously variable transmission (CVT) and an auxiliary transmission which is connected to the CVT and which is automatically shifted from one of two or more forward drive positions to the other depending upon operating conditions of the vehicle. To control the speed ratio of the CVT, a target speed of the input shaft of the CVT is determined according to one of different relationships between the target speed and at least one variable such as a currently required output of the engine. The relationships are stored in memory, corresponding to the forward drive positions of the auxiliary transmission. The appropriate relationship is selected depending upon the forward drive position in which the auxiliary transmission is currently placed while the transmission shift lever is in an auto-shift or engine-brake position.

Abstract: A belt type continuously variable transmission system which includes: a fluid coupling device for transmitting an output from an engine by use of fluid; a belt type continuously variable transmission device for transmitting an output from the fluid coupling device at a continuously variable transmission gear ratio through a belt; an auxiliary transmission device having a function of shifting an output from the belt type continuously variable transmission device in accordance with the forward reverse running conditions; a reduction gear device for reducing an output from the auxiliary transmission device; and an oil pump device for feeding the hydraulic pressures to various hydraulic pressure components such as a valve body and the like wherein the various devices are connected to one another while preventing the various devices from interfering with one another, whereby proper functions of the various devices are satisfactorily performed and the transmission system as a whole can be made simplified in constru