Showa Corporation

Kazuhiko Sadakata

Hayato Tsutsui

Shinya Horie

Atsushi Kagawa

Takeshi Ueki

Nobuaki Tanaka

A pump apparatus includes: a pump that ejects a hydraulic fluid; and a selector valve that switches a direction of a flow of the hydraulic fluid to be supplied to one of a first chamber and a second chamber of a cylinder apparatus, which is internally partitioned by a piston into the first chamber extending during an extending stroke of the cylinder apparatus, and the second chamber extending during a shortening stroke of the cylinder apparatus, and the selective valve has, at a channel connected to the second chamber, an orifice that is narrower than a channel connected to the first chamber.

Pump apparatus and hydraulic actuator

Provided is a pump device and a hydraulic actuator that can reduce the number of steps of performance measurement. The pump device includes: a switching valve for switching a flow of oil to a first chamber or a second chamber of a cylinder device, the inside of which is segmented into the first chamber and the second chamber by a piston; an up blow valve (first chamber-side relief valve) that relieves pressure of a first chamber-side flow path connected to the first chamber; and a down blow valve (second chamber-side relief valve) that relieves pressure of a second chamber-side flow path connected to the second chamber.

Pump device and hydraulic actuator

In a trim/tilt apparatus for a marine vessel propulsion machine, a trim piston is provided with a communication passage which communicates a second tilt chamber with a second trim chamber. The second tilt chamber between the trim piston and a tilt piston can be normally directly communicated with the second trim chamber, and the tilt piston is provided with a shock blow valve which is opened when a working fluid in a first tilt chamber reaches a set pressure, and transfers the working fluid in the first tilt chamber to the second tilt chamber.

Trim/tilt apparatus for marine vessel propulsion machine

A tilt device for a marine propulsion unit is disclosed having a damp bracket fixed to the hull of a vessel a swivel bracket tilting connected to the damp bracket, a cylinder device disposed between the damp bracket and the swivel bracket, and a pump device for extending and contacting the cylinder device, where in the cylinder device and the pump device are arranged in series.

Growing community of inventors

Haga-gun, Japan

Kazuhiko Sadakata