Showa Corporation

Omito Toyoshima

Hisao Takayanagi

Tamotsu Nakamura

Keiji Orihara

Yasuo Funami

In a trim-tilt device for a marine propulsion unit,, a cylinder,of a cylinder device,is covered with a tank,constituting a hydraulic fluid supply/discharge device,and a relief valve,is opened when hydraulic pressure of the tank,becomes higher than a fixed value, so that hydraulic fluid of the tank,can be relieved for the second tilt chamber,B.

Trim-tilt device for a marine propulsion unit

In a trim-tilt device for a marine propulsion unit (,), a check valve (,) is provided for allowing a hydraulic fluid to flow from a pump (,) to a first trim chamber (,A) and a first tilt chamber (,A), and a relief valve (,), which is opened if the hydraulic pressure of the first trim chamber (,A) and the hydraulic pressure of the first tilt chamber (,A) become higher than a fixed value, are connect in parallel to a hydraulic fluid low passage (,) connecting a first trim chamber (,A) and a first tilt chamber (,A) to a pump (,).

Trim-tilt device for marine propulsion unit

A tilt cylinder for tilting an outboard engine has first and second cylinder chambers. A pair of on/off valves is movably disposed in respective fluid passages connected to a hydraulic pump and the first and second cylinder chambers, respectively. The on/off valves are operatively combined with respective shuttle valves which have respective oil passages in facing relationship to the on/off valves, respectively, and respective ball valve bodies for selectively opening the oil passage into communication with each other. When the hydraulic pump is actuated to develop a working oil pressure buildup, one of the on/off valves is opened by the working oil pressure buildup to establish an oil supply passage from the hydraulic pump to one of the first and second chambers, and the other of the on/off valves is opened by the coacting shuttle valve which is moved by the working oil pressure buildup to establish an oil return passage from the other of the first and second chambers to the hydraulic pump. The shuttle valves have respective auxiliary passages communicating with the oil passages, respectively, and the oil supply and return passages, respectively.

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Gyoda, Japan

Omito Toyoshima