Patent ID: 7972189
Filing Date: 2011-07-05
Classification: B63H,F15B

Abstract:
1. A tilt and trim device for an outboard motor, the tilt and trim device comprising: a tilt cylinder to raise and lower the outboard motor; a trim cylinder to raise and lower the outboard motor; a tilt cylinder extension side oil chamber and a tilt cylinder rod housing oil chamber provided in the tilt cylinder; a trim cylinder extension side oil chamber and a trim cylinder rod housing oil chamber provided in the trim cylinder; a reserve tank to receive a difference of an oil amount between an oil amount in the tilt cylinder extension side oil chamber and an oil amount in the tilt cylinder rod housing oil chamber and between an oil amount in the trim cylinder extension side oil chamber and an oil amount in the trim cylinder rod housing oil chamber when the outboard motor is operated; a relief valve to communicate with the reserve tank; an oil route to allow the tilt cylinder extension side oil chamber to communicate with the reserve tank; and a branch oil route branched from the oil route and to communicate with the trim cylinder; wherein at least one hydraulic pressure adjustment mechanism is arranged between the tilt cylinder extension side oil chamber and the trim cylinder extension side oil chamber to adjust hydraulic pressure applied to the trim cylinder from the branch oil route to be not greater than a specified value when the outboard motor is forcibly lowered by an external force from a tilt range in which the outboard motor is raised or lowered only by the tilt cylinder.