Kabushiki Kaisha Toyota Jidoshokki

Nishina Industrial Co., Ltd.

Akihito Nibe

Shigeto Nakajima

Tetsuya Goto

Kenichi Hagino

Koichi Kinoshita

Satoshi Takano

Ryo Yazawa

Yasushi Kuwano

A directional control valve includes: a housing having a cylindrical spool hole communicating with an inlet port letting a fluid from an external supply source at a predetermined pressure and an outlet port flowing the fluid to a working cylinder; a spool movable in the spool hole axially and changing an amount of flow of the fluid; a first solenoid driving section having a first needle coupled to or integral with a first end portion of the spool and driving the spool; and a second solenoid driving section having a second needle coupled to or integral with a second end portion of the spool and driving the spool, the directional control valve including a pressure equalization circuit equally applying a pressure to the end portions.

Directional control valve

When an engine stall is likely to occur, the pressure of the back pressure chamber of a relief pressure valve is released to adjust the relief pressure of the relief pressure valve. This actuates a pressure compensating circuit to release the pressure in a control circuit to an oil tank. Thus, a rapid increase of the pressure due to a cargo handling operation is restricted, and an engine stall due to insufficient torque of the engine is avoided.

Industrial vehicle

Growing community of inventors

Kariya, Japan

Akihito Nibe