Toyoda Koki Kabushiki Kaisha

Yamasei Kogyo Co., Ltd.

Yoshiyuki Toyama

Susumu Honaga

Yoshiyuki Takeuchi

Ryutaro Abe

Tadataka Narumi

Mikio Nakajima

Hirotune Suzuki

Syuzi Takagi

A pressurized fluid supply hose which conducts pressurized fluid discharged from a pump to a fluidically operated device is disclosed. A spiral tube formed by two spirally wound band members is fixed by caulking in one end of a steel pipe. The outer shape of the one end of the steel pipe includes a taper portion formed to slope gradually between a thin portion and an outer diameter portion. By effecting a caulking process with a caulking tool having a pressing portion extending in parallel to an outer surface of the steel pipe, the outer taper portion of the steel pipe is contracted to formed an inner taper portion at an internal surface thereof, and one end of the spiral tube is fixed to the inner taper portion. Because the spiral tube is gradually deformed along the inner taper portion of the steel pipe, it can avoided that a large clearance is formed between the two band members of the spiral tube.

Pressurized fluid hose

There is disclosed a flow control apparatus for a power steering device in which an operating fluid discharged from a pump is delivered to a power steering device through a restricted passage, and the fluid flow is adjusted by a spool valve movable in response to the pressure difference across the restricted passage. The spool valve contains a first relief valve operating at a first setting pressure in response to the fluid pressure transmitted from a passage located at the downstream side of the restricted passage through a connecting passage. The spool valve also contains a second relief valve operating at a second setting pressure higher than the first setting pressure, but lower than a allowable maximum load pressure, in response to the fluid pressure directly transmitted from a chamber located at the upstream side of the restricted passage. During operations under normal temperature conditions, the first relief valve operates when the load pressure reaches the first setting pressure. Under low temperature conditions, the second relief valve first operates at the second setting pressure, and then the first relief valve operates in order to reduce the fluid pressure to the first setting pressure. With this operation, the fluid pressure delivered to the power steering device is maintained not to exceed the maximum load pressure even under low temperature condition.

Flow control apparatus for a power steering device

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Anjo, Japan

Yoshiyuki Toyama