Heat exchange – Non-communicating coaxial enclosures
Reexamination Certificate
2002-01-04
2004-01-06
Flanigan, Allen (Department: 3743)
Heat exchange
Non-communicating coaxial enclosures
C165S916000, C165S907000, C285S334500
Reexamination Certificate
active
06672377
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to oil cooler and more particularly to an easy assembled oil cooler capable of preventing crack caused by irregular heat expansion from occurring.
BACKGROUND OF THE INVENTION
It is known that high heat may be generated in a machine during operating.
This is particularly true in an enclosed environment. Hence, heat dissipation is very important. Otherwise, machine is subject to malfunction. A conventional oil cooler
90
in a gearshift box is shown in FIG.
1
. The cooler
90
comprises a cooling pipe
91
including an inner water pipe and a spaced outer oil pipe, and two end connectors
92
each coupled to cooling pipe
91
at A by welding, end connectors
92
having an oil inlet
93
, an oil outlet
95
both in fluid communication with oil pipe, a water inlet
94
, and a water outlet
96
both in fluid communication with water pipe. With this construction, hot oil can be cooled cyclically. Note that cooling pipe
91
are welded to rather than integrally formed with end connectors
92
because oil-water separation and leak-proof arrangements are provided within cooling pipe
91
. However, welding can cause a problem of uneven stress distribution. Further, the welded areas A tend to crack caused by irregular heat expansion since cooling pipe
91
and end connectors
92
are typically under high temperature operating environment. A broken oil cooler
90
can neutralize the oil-water separation capability thereof or cause leakage. As a result, a heat dissipation capability of the oil cooler
90
is lowered. Further, solder paste used in welding may generate poison gas which may pollute the environment and cause health problem to workers. Thus, it is desirable to provide a leak-proof while environmental friendly oil cooler in order to overcome the above drawbacks of prior art.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an oil cooler which can eliminate potential crack in welded portion of cooling pipe and end connectors and leakage as experienced in prior art. By utilizing this, it is possible of maintaining a normal operation and increasing a useful life of the oil cooler.
It is another object of the present invention to provide an oil cooler wherein cooling pipe and end connectors are easy to assemble. Most importantly, an effective oil-water separation is carried out by the oil cooler.
REFERENCES:
patent: 3339260 (1967-09-01), Burne et al.
patent: 4029345 (1977-06-01), Romanelli
patent: 4475584 (1984-10-01), Martin et al.
patent: 4610466 (1986-09-01), Geer et al.
patent: 5950716 (1999-09-01), Appelquist et al.
Flanigan Allen
Rosenberg , Klein & Lee
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