Patent ID: 6796860
Filing Date: 2004-09-28
Classification: B63H,F01M

Abstract:
A lubricant pump seal for an outboard motor, the outboard motor comprising an internal combustion engine, a water propulsion device, a drive shaft configured to transmit torque from the engine to the water propulsion device, a lubricant pump configured to supply lubricant to the internal combustion engine, the lubricant pump including a pump casing enclosing a pump chamber, the drive shaft extending through the pump casing, a rotor housed in the pump chamber for rotation with the drive shaft, a first sealing body for sealing an upper clearance formed between an upper part of the pump casing and the drive shaft, a first passage configured to guide liquid lubricant to the pump chamber and a second passage configured to guide air to an outlet of the second passage, the outlet being disposed at a point outside the pump chamber and within the pump casing where negative pressure is generated during operation of the pump, the first sealing body being disposed between the pump chamber and the point.