Abstract: A parking lock for an automatic transmission for motor vehicles, having a parking gearwheel mounted rotationally and rigidly on the output shaft of the transmission, includes a pivotable parking pawl adapted to engage the parking gearwheel, and actuating rod with a sliding sleeve (5) displaceable relative to the actuating rod against the force of an engagement spring, the parking pawl being adapted to be moved by the sleeve into an operative position, the actuating rod (8) being shaped by upsetting to form a thickened piston portion (11) which is received in the sleeve.

Abstract: A control valve system for a planetary transmission having planetary gear elements and clutch and brake means for controlling the relative motion of the gear elements, said clutch and brake means including a second speed ratio brake servo having a double acting piston with a brake apply side and brake release side, a fluid pump driven by the input elements of said transmission, a throttle pressure valve for developing a torque input signal, a source of a driven speed signal, control valves responsive to said signals for controlling distribution of pressure from said pump to said servos, and a servo regulator valve means for modulating the regulated pressure in said circuit in response to changes in said torque signal to develop a controlled pressure on the release side of said second speed ratio servo, whereby the rate of application of said second speed ratio servo is controlled upon application of pressure to the apply side thereof.

Abstract: An automatic control valve system for a multiple ratio power transmission mechanism for an automotive vehicle wherein the mechanism comprises multiple gear elements, the motion of which is controlled by selectively engageable clutches and brakes, a pressure source driven by a power input element of the transmission, a valve circuit for distributing pressure from said source to the clutches and brakes to establish a shift sequence, a pressure regulator valve that is responsive to engine intake manifold pressure and to speed whereby an increase in engine throttle setting will result in an increase in circuit pressure in the control valve system, and a throttle pressure cut-out valve that interrupts distribution of engine intake manifold pressure signals to the pressure regulator valve during operation of the mechanism in the highest speed range thereby preventing an excessive pressure in the control valve system while retaining an adequate residual pressure to maintain clutch and brake engagement during high sp