초록 ▼

A shock absorbing hydraulic actuator comprises a cylinder with first and second pistons slidably disposed therein. The first and second pistons are moveable relative to each other. A poppet is supported by the first piston and is moveable relative to the first piston. In response to hydraulic fluid

A shock absorbing hydraulic actuator comprises a cylinder with first and second pistons slidably disposed therein. The first and second pistons are moveable relative to each other. A poppet is supported by the first piston and is moveable relative to the first piston. In response to hydraulic fluid pressure within a passage of the first piston, the poppet can be caused to move in a direction which opens a passage through the first piston to allow the first piston to move relative to the second piston in response to a shock impact such as that which can result from an outboard motor striking a submerged or floating object. The second piston remains in its original position. A bleed passage allows the first piston to resume its original position next to the second piston after the impact has occurred. This movement towards its original position is caused naturally by the weight of an object supported by the hydraulic actuator, such as an outboard motor.

대표청구항 ▼

[ We claim:] [1.] A hydraulic actuator, comprising:a cylinder;a first piston slidably disposed within said cylinder;an actuator shaft attached to said first piston and extending through a first end of said cylinder;a second piston slidably disposed within said cylinder, said first and second pistons

[ We claim:] [1.] A hydraulic actuator, comprising:a cylinder;a first piston slidably disposed within said cylinder;an actuator shaft attached to said first piston and extending through a first end of said cylinder;a second piston slidably disposed within said cylinder, said first and second pistons being movable relative to each other to define the volumes of a first chamber between said first piston and a first end of said cylinder, a second chamber between said second piston and a second end of said cylinder, and an intermediate chamber between said first and second pistons;a fluid passage through said first piston; anda poppet supported by said first piston, said poppet being movable relative to said first piston between a closed position blocking said fluid passage and an open position which connects said first chamber and said intermediate chamber in fluid communication with each other, said actuator being attached to an outboard motor for the purpose of moving said outboard motor from one trim position to another trim position.