Patent ID: 6042435
Filing Date: 2000-03-28
Classification: B63H

Abstract:
A tilt-trim device for a marine propulsion unit supportably mounted to a mounting bracket, said device provided between said mounting bracket and said propulsion unit, comprising:a cylinder device having a longitudinal axis and comprising a cylinder housing having an inner cylindrical sleeve situated therein, said inner cylindrical sleeve filled with a working fluid and a piston having a piston rod, which said piston is slidably provided within said sleeve so as to divide said cylinder housing into a piston side space and a rod side spacer;a boosting housing slidably provided about an outer periphery of said cylinder housing so as to form a liquid impervious boosting space with said cylinder housing, said boosting housing coaxial with and contacts an end of said piston rod;a working fluid supplying and exhausting device intergrally formed with said cylinder housing for supplying a working fluid alternatively to one of said piston side and boosting spaces, and said rod side space, during an extension or compression of said piston rod from said cylinder housing, said cylinder housing including a channel connecting said working fluid supplying and exhausting device and said boosting space, whereby a pressure force is indirectly applied to the piston rod in a rod extension direction during a supplying of the working fluid from said working fluid supplying and exhausting device to said boosting space through said channel.