Lubricating oil discharge system

Details Lubricating oil discharge system Lubricating oil discharge system

1999-07-29

2001-05-29

Fenstermacher, David (Department: 3682)

Lubrication

Systems

With measuring or metering value system

C384S288000, C384S391000, C184S006300

Reexamination Certificate

active

06237719

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lubricating oil discharge system having a discharge port which is made to open into a bearing bore for a camshaft of an internal combustion engine.
2. Prior Art
In order to supply lubricating oil to a location needing it without any delay immediately an engine is started, it is effective to make a lubricating oil passage as short as possible, but if trying to connect an oil pump provided in the vicinity of a crankshaft to a camshaft bearing provided in a cylinder head at the shortest distance, a lubricating oil discharge port has to be opened in a lower side of the camshaft bearing.
However, if a lubricating oil discharge port is made to open in a lower side of a camshaft bearing, all lubricating oil in a bearing bore eventually drops into an oil pan when the engine is stopped, and it becomes highly probable that film lubrication is no longer effective when the engine is restarted.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a lubricating oil discharge system having a discharge port improved so as to solve the problem inherent in the prior art, not to disturb a quick supply of lubricating oil and to maintain film lubrication when the engine is started.
In accordance with the present invention, a lubricating oil discharge system comprises a discharge port for allowing lubricating oil to flow out of a lubricating oil passage in which an oil pressure source is provided at a lower portion thereof into a bearing bore for a camshaft of an engine. The discharge portion is made to open in a top surface of a boss provided so as to protrude from a bottom of a recessed well acting as a lubricating oil reservoir provided in an inner circumferential surface on a lower side of the camshaft bearing bore. With this construction. The level of lubricating oil retained in the recessed well formed in the lower side of the bearing bore can be raised considerably high, and therefore, even in an operating condition where the discharge pressure of an oil pump has not yet been increased sufficiently resulting immediately the engine is started, the lubrication of the camshaft bearing can be effected with lubricating oil remaining in the recessed well.


REFERENCES:
patent: 2004254 (1935-06-01), Taub
patent: 2827342 (1958-03-01), Roach
patent: 2926972 (1960-03-01), Burrell
patent: 3958541 (1976-05-01), Lachnit
patent: 5988129 (1999-11-01), Prior et al.
patent: 6095690 (2000-08-01), Niegel et al.

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