Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1986-10-01
1988-07-12
Cuchlinski, Jr., William A.
Internal-combustion engines
Cooling
Automatic coolant flow control
123198E, F01P 1110
Patent
active
047562790
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to a control arrangement for the cooling air of air-liquid-cooled internal-combustion engines, particularly of motor vehicles, having an air-liquid radiator, a temperature-controlled cooling-air stopping element such as a rolling curtain, and a radiator fan arranged in sequence behind one another in a cooling-air flow-end channel, comprising a fan shroud, to an engine housing or engine space in cooling-air flow direction, the stopping element in the closed position closing the connecting openings between the cooling-air outlet of the radiator and the engine housing or engine space, wherein the stopping element in its closed position and the part of the flow-in channel connected to the stopping elements in flow direction, are components of the engine housing or engine space developed as a noise capsule, and wherein in the flow-end channel, outside the noise capsule between the radiator and the stopping element, a cooling-air outlet opening is arranged that leads to the outside and closes in the opposite direction to the stopping elements.
A known arrangement of this construction according to U.S. Pat. No. 1,170,730 has a air blocking element that is developed as a flap shutter or rotary slide and a radiator fan that at a distance is exposed behind it in flow direction of the cooling air. As a result, the air blocking element controls the cooling effect of the radiator. For a reduction of the cooling function of the radiator fan itself, this radiator fan is equipped with adjustable fan blades. The air blocking element, the radiator fan and the engine, in an open arrangement, are arranged at a distance behind one another in flow direction of the cooling air. Noise from the radiator fan, the engine and its driving connections as well as the removal of heat of the engine and the radiator can spread to all directions and therefore stress the environment and also extend the warm-up time after a cold start of the engine.
Another known arrangement is disclosed in U.S. Pat. No. 2,703,075.
On the basis of DE-PS No. 532 730, a stopping element for the radiator is known that is developed as a double curtain and reduces the heat dissipation of the radiator to both sides but has no effect on the noise and heat emission of the radiator fan and of the engine.
It is the objective of an invention to further develop the control arrangement of the initially mentioned construction in such a way that the noise and heat emission from the engine and the radiator fan are reduced.
As a result, the noise and heat emission, from a noise capsule that is substantially tight to all sides, when the air blocking element is closed, can be reduced considerably in the case of a cold engine and an engine operated at part load and thus especially always in cases when the noise emission especially in the case of Diesel engines is especially high and a high, damming of heat is especially advantageous for low wear as well as low fuel consumption and a low emission of harmful exhaust gas substances by means of a short warm-up phase.
Another object of the invention is the provision of a control arrangement for the cooling air of air-liquid-cooled internal-combustion engines, wherein a stopping element is developed to be largely airtight and wherein a fan has a fan shroud having a narrow annular gap that is largely free of return flow in the direction of the outer circumference of its running wheel. With such a configuration, when the stopping element is closed, largely a zero blower output of the fan is achieved so that for this purpose, despite the rigid driving connection with the engine, hardly any driving output is required and therefore the construction expenses of a fan coupling or an electric fan motor are not necessary.
It is another object of the invention to provide a control arrangement for the cooling air of air-liquid-cooled internal-combustion engines, wherein a stopping element is developed as a rolling curtain having a supporting screen that penetrates a fan shroud in tr
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patent: 4455971 (1984-06-01), Kirchweger et al.
patent: 4476820 (1984-10-01), Nixon
Bayerische Motoren Werke A.G.
Cuchlinski Jr. William A.
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