Internal-combustion engines – Lubricators – Crankcase – pressure control
Reexamination Certificate
1999-11-29
2001-10-16
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Lubricators
Crankcase, pressure control
C123S1980DA, C220S023400
Reexamination Certificate
active
06302078
ABSTRACT:
TECHNICAL FIELD
This invention relates to the field of the two-cycle internal combustion engines. It concerns a two-cycle internal combustion engine with additional engine oil lubrication system comprising a fuel tank which can be filled with fuel through a filling opening which can be closed with a fuel tank cap, as well as an engine oil tank which can be filled with engine oil through a filling opening which can be closed with an engine oil cap.
PRIOR ART
High speed two-cycle internal combustion engines (Otto engines), such as those which are used for example in hand-operated tools such as chain saws or the like are usually tanked up with a fuel/oil mixture. The oil fraction of the mixture serves to the lubrication of the internal combustion engine.
However, it turned out that, for highly stressed two-cycles engines which are operated with a mixing ratio which is much higher than the formerly usual ratios of 1:25 or 1:50, lubrication problems do appear, since the highly stressed spots are not optimally lubricated, while other spots are further lubricated more than sufficiently. This is why—as for environmental reasons as well—the procedure chosen is that of a separate lubrication for which an additional engine oil lubrication system is provided which obtains the required engine oil for it out of a separate engine oil tank. Since the occuring oil consumption is difficult to control, which is specific to machines with separate lubricaton, it must be seen to that the user checks the content of the engine oil tank sufficiently often and eventually refills it, if the oil-level has dropped. The problem here is that the user of a tool with two-cycle internal combustion engines is generally used to the fact that the lubrication of the machine takes place maintenance-free over the mixture.
DESCRIPTION OF THE INVENTION, AIM, SOLUTION, ADVANTAGES
Therefore, the aim of the invention is to develop a two-cycle internal combustion engine with separate lubrication so that a regular checking of the oil level of the separate lubrication by the user is caused or at least promoted.
The aim of the invention is reached for a two-cycle internal combustion engine of the above mentioned type by the fact that, to assure sufficient engine oil supplies, both tanks are configured with their tank caps so that, when filling the fuel tank, the attention of the operating person is drawn to the engine oil tank. Because the operating person's attention is drawn to the engine oil tank, the operating person is reminded of the existence of the engine oil tank and the separate lubrication. Thus, the probability of a conscious oil-level checking increases. Since this action is connected with the frequent fuel filling operation, the operating person is often enough reminded of the checking of the oil-level.
A first preferred embodiment of the internal combustion engine according to the invention is characterized in that the filling opening of the fuel tank which can be closed with the fuel tank cap and the filling opening of the engine oil tank which can be closed with the engine oil tank cap are placed directly the one besides the other. The result is that the operating person's look when filling the fuel tank simultaneously falls onto the filling opening of the engine oil tank so that the operating person is most probably reminded of the requirements of the separate lubrication.
The operating's person attention can be drawn more strongly to the engine oil tank when, according to a second preferred embodiment, a modification must be made on the engine oil tank cap to open the fuel tank cap. Thus, the operating person is compelled not only to look at the filling opening of the engine oil tank but to directly seize the engine oil tank cap and so to be directly reminded of an oil level checking.
A preferred further development of this embodiment is characterized in that, to open the fuel tank cap, first the engine oil tank cap has to be opened. It is thus ensured that the operating person can have a look into the opened engine oil tank before filling fuel and can easily state if the fuel level in the engine oil tank is sufficient.
Since there is the risk, with this further development, that fuel is filled into the open engine oil tank, it is provided for, according to a further preferred embodiment, that the engine oil tank cap comprises locking means which can be adjusted between a locked position and a released position and, in the locked position, prevent the opening of the fuel tank cap and in the released position allow for the opening of the fuel tank cap. In this case, the engine oil tank cap must not be completely opened, but a moving of the locking means is sufficient. Thus the risk that fuel is unintentionally filled into the engine oil tank is avoided. Moreover, the operating person does no longer get easily an insight into the engine oil tank.
Other embodiments result from the depending claims.
REFERENCES:
patent: 4535910 (1985-08-01), Nagashima
patent: 6109467 (2000-08-01), Schliemann et al.
patent: 2943971A1 (1980-05-01), None
patent: 1164087 (1969-09-01), None
patent: 58071219 (1983-04-01), None
Brauer Steffen
Schoenhaar Jochen
Singer Andreas
Dolmar GmbH
Huynh Hai
Kamen Noah P.
McCormick Paulding & Huber LLP
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