Kabushiki Kaisha Komatsu Seisakusho

Masayuki Sato

Takashi Kuse

Haruyuki Matsuda

Epicycloidal gear type speed change gear system

2-path hydromechanical transmission system and method of producing the

Automatic transmission for hydraulic drive auxiliary speed change gear

A detecting device for solenoid operated valve, the valve being located between a pilot fluid pressure supply source via a pilot operated directional control valve associated with the solenoid operated valve and a drain tank and adapted to be switched over to either a connecting position where an inlet port thereof for pressurized pilot fluid is allowed to communicate with a drain port thereof connected to the drain tank or a disconnecting position where the inlet port is disconnected from the drain port. The detecting device has a cylinder chamber connected to the inlet port of the solenoid operated valve and a plunger inserted partially into the cylinder chamber so as to form a pressure chamber therebetween, wherein the plunger is able to be pushed manually into the pressure chamber only when the solenoid operated valve is kept at the connecting position.

Manual device for detecting malfunction of a solenoid valve

A pressure control system for a transmission having a series of fluid-operated clutches which are engaged and disengaged through a selector valve to change drive ratios, has a valve for modulating the fluid pressures applied to the clutches to effect smooth shock free shifting. Basic control of the pressure at any of the clutches is effected by a modulation valve upstream of the selector valve. The modulation valve has an auxiliary chamber formed at one end thereof, a piston mounted therein and an auxiliary port connected to one of the clutches having a maximum filling time thereby shortening the filling time thereof without changing filling times of other clutches.

Growing community of inventors

Komatsu, Japan

Masayuki Sato