Internal-combustion engines – Cooling – With vent
Patent
1994-03-21
1995-10-10
Kamen, Noah P.
Internal-combustion engines
Cooling
With vent
16510432, F01P 322
Patent
active
054562180
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a combined storage tank and expansion tank arrangement for a water-cooled internal combustion engine cooling system, whereby the storage tank which is provided with a filler opening and the expansion tank are housed in a common container tank made from two moulded plastic parts, with the storage tank and expansion tank internally connected via a vertically disposed overflow channel.
BACKGROUND OF THE INVENTION
The above-described cooling system with a storage tank for the cooling liquid and a separate expansion tank for the expansion of the liquid during warming-up is used for example on heavier trucks and buses where very high functional safety requirements are imposed.
Where the available height is restricted, it has been usual to use separate tanks which are mounted by brackets and connected together by means of tubes and tube clamps. This implies that a relatively large number of components have to be stored and assembled during the production of a vehicle. Since it is desirable to reduce the number of assembly components, combined storage tanks and expansion tanks forming a common container tank are now becoming available. This rationalization is most effective if the container tank is made from two injection-moulded plastic halves which are welded together to form a finished unit with all necessary functions integrated within the two halves.
Such a container tank is shown in DE OS 35 33 095, whereby the storage tank and the expansion tank are connected via a centrally located overflow channel. A disadvantage with this arrangement, i.e. that leakage can arise between the two chambers, has been solved by the provision of a double walled partition wall between the two chambers, whereby infiltration is indicated by leakage of liquid through overflow holes in the double walled cavity.
TECHNICAL PROBLEM
An object of the present invention is thus to provide a container tank for cooling liquid with minimal installation dimensions, with which the cooling system can be tested in a more reliable manner using pressurized air.
SOLUTION
This object is achieved according to the invention by means of the overflow channel being integral with and connected to the filler opening of the storage tank. By means of this arrangement a hermetical test can be easily performed after affixing a test instrument in the filler opening instead of to the filler cap. In this manner the cooling system can be pressure-tested with the exclusion of the expansion tank. Thereafter the connection to the expansion tank can be opened and the entire system can then be pressure-tested.
Advantageous embodiments to the invention will be apparent from the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described in more detail with reference to the attached drawings, in which
FIG. 1 is a side view of a container tank according to the invention with a partially sectioned wall,
FIG. 2 is a corresponding end view of the container tank, and
FIG. 3, 4 show in broken plan views the interior of the cover and base of the container tank.
BEST MODE OF CARRYING OUT THE INVENTION
The container tank shown in the drawings is assembled from two tank halves 10, 11 with the joint line 12 extending in a horizontal plane. The two halves 10, 11 are suitably made by injection-moulding of a propene plastic and are joined together by heat welding.
The container tank is provided with moulded brackets 13 for direct mounting in the engine compartment of a vehicle and includes two separate chambers, each having an opening 14 and 15. The one chamber 16 forms the storage tank for the cooling liquid in the cooling system and is connected to the not shown cooling system via a base outlet 17 and two breather pipes 18. The other chamber 19 forms an expansion tank for the storage tank 16 and is connected thereto via an overflow channel 20 which extends between the upper portion of the storage tank 16 and the lower portion of the expansion tank 19.
As best shown in FIGS.
REFERENCES:
patent: 4130159 (1978-12-01), Ohta et al.
patent: 5219022 (1993-06-01), Martenas et al.
AB Volvo
Kamen Noah P.
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