Lubrication – Automobile crank and gear case service
Reexamination Certificate
1999-07-19
2001-05-08
Marmor, Charles A (Department: 3681)
Lubrication
Automobile crank and gear case service
C184S055100, C141S086000
Reexamination Certificate
active
06227332
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a structure for replenishing a transmission case with fresh engine oil, and more particularly to a structure for draining old engine oil in the transmission case by an automatic circulation mechanism.
DESCRIPTION OF THE PRIOR ART
The conventional way for changing the engine oil in a transmission case is to open up the inlet and the outlet of the transmission case so as to enable the old engine oil in the transmission case to be drained via the outlet by atmospheric pressure. Such a conventional way for changing the engine oil as described above is defective in design, in that the old engine oil can not be completely drained out of the transmission case, and that the old engine oil residue is attached to the inner wall of the transmission case. In order to overcome such deficiencies as described above, an improved structure was introduced to the market place. The improved structure includes a pump by means of which a suction effect is brought about to drain the old engine oil in the transmission case. The new engine oil is then injected into the transmission case by re-circulating the old engine oil through a re-circulation system which is provided with a number of one-way valves and is therefore vulnerable to damage, thereby resulting in the crack in the pipe line of the re-circulation system. As a result, the transmission case may be also damaged. In other words, the oil-changing loop of the re-circulation system is too complicated to work effectively and precisely.
SUMMARY OF THE INVENTION
The primary objective of the present invention is therefore to provide an improved structure for changing engine oil in the transmission case, which is free from the deficiencies of the conventional oil-changing structure described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by an engine oil changing structure which consists essentially of a low pressure oil cylinder and a high pressure automatic throttle valve. The low pressure oil cylinder is provided with a piston which divides the low pressure oil cylinder into an upper portion (new oil area) and a lower portion (old oil area).The oil cylinder is provided at the top thereof with a new oil inlet and an air pipe which is connected serially with an air switch, an air adjusting valve and an air pressure gauge. The new oil area is provided with a new oil pipe connected therewith, whereas the old oil area is provided with an old oil pipe connected therewith. The new oil pipe and the old oil pipe are controlled by an oil passage switch, which is connected with a first oil pipe which is in turn connected with an oil distributing valve. The oil distributing valve is connected with the high pressure automatic throttle valve and a second oil pipe which is connected serially with a first oil meter and an oil filter bud. A third oil pipe is connected with an oil pressure gauge. A fourth oil pipe is connected serially with the high pressure throttle valve and a three-way valve which is connected at one end thereof with an oil replenishing tank, and at other end thereof with a second oil meter. The new oil pipe is connected with another three-way valve.
REFERENCES:
patent: 3837432 (1974-09-01), McKendrick
patent: 4128140 (1978-12-01), Riches
patent: 4527580 (1985-07-01), Chheda
patent: 5349992 (1994-09-01), Gallo et al.
patent: 5472064 (1995-12-01), Viken
patent: 5964256 (1999-10-01), Bedi et al.
patent: 6065567 (2000-05-01), Camacho et al.
patent: 562832 (1957-12-01), None
Bacon & Thomas PLLC
Marmor Charles A
Pang Roger
LandOfFree
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