Internal-combustion engines – Cooling – With cooling of additional parts or materials
Patent
1990-05-29
1994-01-04
Kamen, Noah P.
Internal-combustion engines
Cooling
With cooling of additional parts or materials
123 4154, 606053, F01P 106
Patent
active
052751333
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to an apparatus for cooling an internal combustion engine having a supercharger attached thereto. More particularly, the present invention relates to piping structure for a coolant circulating passage for allowing coolant to circulate through the supercharger to cool the latter.
BACKGROUND ART
A variety of endeavors have been heretofore made for an internal combustion engine having a supercharger attached thereto for the purpose of preventing the temperature of a bearing portion for the supercharger from being elevated as a rotational shaft of the engine is rotated at a high speed and moreover improving the performance of the lubricant for cooling the bearing portion by bringing coolant into the bearing portion to cool it after the coolant flows through a housing of the engine to cool it.
FIG. 3 is an explanatory view which schematically illustrates the structure of a conventional apparatus for cooling an internal combustion engine having a water-cooled supercharger of the aforementioned type attached thereto.
With the conventional apparatus shown in FIG. 3, a housing of the engine is cooled in such a manner as described hereinafter.
In detail, coolant is cooled by radiating heat via a radiator b and the cooled coolant is then introduced into a coolant pump f via a lower tank of the radiator b, an outlet pipe d and a coolant inlet pipe e. The coolant pump f is driven by the engine so as to pump coolant through a coolant circulating passage g in the engine a to cool a cylinder block h, a cylinder head i and other components. It should be noted that FIG. 3 shows only a part of the coolant circulating passage g corresponding to the cylinder head i.
After coolant cools the interior of the engine a, it is finally brought into a thermostat housing j. The thermostat housing j includes a thermostat k for the purpose of regulating the flow rate of coolant adapted to flow through the radiator b by opening or closing a valve in the thermostat k depending on the coolant temperature.
Now, it is assumed that the temperature of coolant in the engine a is maintained at a level higher than an adequate temperature acceptable for operation of the engine a. In this case, the thermostat k is brought in an opened state so that coolant is delivered to an upper tank p on the radiator b via the thermostat k, a coolant outlet pipe l, a pipe m and an inlet pipe n.
Then, coolant is cooled down to an adequate temperature in the radiator b, and the thus cooled coolant is delivered to the engine a to cool it by circulating therethrough.
On the other hand, in a case where the temperature of coolant in the engine a is maintained at a level lower than the aforementioned adequate temperature, the thermostat k is closed so that coolant is delivered directly to the coolant inlet pipe e via a bypass pipe g without flowing through the radiator b to cool the coolant. In such manner, the temperature of coolant in the engine a is maintained at an adequate level.
The manner of cooling the housing of the engine a is as described above. Next, description will be made below as to cooling of the supercharger r.
Specifically, to cool the supercharger r the apparatus includes a coolant feed pipe t by way of which a part of the coolant circulating passage g corresponding to the cylinder block h communicates with a bearing portion s for the supercharger r as well as a return pipe u by way of which the bearing portion s communicates with the outlet pipe
With this construction, coolant in the coolant circulating passage g is delivered to a coolant flow passage in a center housing of the supercharger r via the coolant feed pipe t. As coolant flows through the coolant flow passage, heat exchange is accomplished between the coolant and the bearing portion s.
After completion of the cooling operation for the supercharger r, coolant flows through the return pipe u so that the flow of coolant is united with the flow of coolant which has cooled the interior of the engine a, in the outlet pipe l. Then, the
REFERENCES:
patent: 3726262 (1973-04-01), Moon
patent: 4107927 (1978-08-01), Gordon, Jr. et al.
patent: 4231424 (1980-11-01), Moranne
Kawashima Yasukuni
Sasaki Toshio
Kamen Noah P.
Sasaki Toshio
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