Vertical engine

Details Vertical engine Vertical engine

2006-06-27

2006-06-27

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Lubricators

Crankcase, pressure control

Reexamination Certificate

active

07066134

ABSTRACT:
In a vertical engine, a bulged portion protrudes upwards, in conformity to a partially cylindrical outer wall of uppermost one of cylinders, on an upper surface of a cylinder block forming a bottom wall of a chain chamber accommodating a chain for driving a camshaft and a balancer shaft through a crankshaft. A pair of oil return bores for returning an oil in the chain chamber to an oil pan are provided in lower portions of the bottom wall on opposite sides of an axis of the bulged portion. The oil which has lubricated the chain in the chain chamber flows so that it is distributed to the opposite sides of the axis, and the oil is returned smoothly from the oil return bores formed in the bottom wall to the oil pan.

REFERENCES:
patent: 4974561 (1990-12-01), Murasaki et al.
patent: 5031591 (1991-07-01), Shinoda et al.
patent: 6484685 (2002-11-01), Kuroda et al.
patent: 6520139 (2003-02-01), Kobayashi
patent: 6652338 (2003-11-01), Takahashi
patent: 6845744 (2005-01-01), Haman
patent: 6863042 (2005-03-01), Oh
patent: 9-41909 (1997-02-01), None

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