Oblon, Spivak, McClelland, Maier & Neustadt
Hydraulic control apparatus for vehicle transmission system, incorporating valves for reverse inhibit valve
 A hydraulic control apparatus for a vehicle power transmission for transmitting power from an engine to a drive wheel a reversing mechanism having a reverse position established by a hydraulic actuator. The apparatus includes a reverse inhibit valve disposed in a hydraulic line leading to the hydraulic actuator and having a reverse inhibit position for inhibiting the mechanism from being placed in the reverse position and a non-inhibit position for permitting the mechanism to be placed in the reverse position. The apparatus uses a first and a second pilot pressure generating device for producing a first and a second pilot pressure, respectively. A relay valve is provided for producing a first hydraulic signal for establishing the reverse inhibit position of the reverse inhibit valve, based on one of combinations of operating states of the two pilot pressure generating devices, and a second hydraulic signal for establishing the non-inhibit position, based on the other combinations. 
Toyota Jidosha Kabushiki Kaisha
F F
F16H F16H
inventional inventional
Ryoji Nobuyuki Hiroshi Kunio
Habuchi Kato Itoh Morisawa