Thermostat valve

Details Thermostat valve Thermostat valve

2000-06-22

2001-06-12

Tapolcai, William E. (Department: 3744)

Automatic temperature and humidity regulation

Cooling radiator

Bypass

C236S09300A

Reexamination Certificate

active

06244516

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a thermostat valve for guiding a coolant flow in a coolant system in an internal combustion engine.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,055,298, for example, discloses a thermostat valve for a coolant system, in which the valve body forming part of the valve is provided on one side of the holder, as viewed along the longitudinal axis of the valve, more precisely downstream in the coolant system. In this manner, the valve body will in practice be located outside the cylinder head of the internal combustion engine, and will thus require a separate valve housing, which is both costly and requires a considerable amount of space to achieve. Furthermore, a condition for the known thermostat valve is that two out of the three connecting channels connects to the valve laterally, i.e. crossways in relation the longitudinal axis of the valve, which results in losses of pressure, thus demanding a great deal of the capacity of the coolant pump.
An object of the present invention is to provide a thermostat valve which is space-saving and which results in reduced losses of pressure in relation to known solutions.
SUMMARY OF THE INVENTION
In accordance with the present invention, this and other objects have now been realized by the invention of a thermostat valve for guiding the flow of coolant in an internal combustion engine including a first channel including a first valve seat, a second channel, and a third channel, the first, second and third channels being in fluid communication with a valve chamber, the thermostat valve comprising a valve housing including outer attachment means adapted to mount the valve in a fixed position within the valve chamber, the valve housing including a valve housing opening facing the second channel, and including a second valve seat, a tubular valve body including a first end including a first opening facing the first channel and a second end including a second opening facing the second channel, the tubular valve body being movably mounted with respect to the valve housing along a valve axis between a first end position wherein the tubular valve body bears against the first valve seat whereby the first and second channels are in fluid communication and the first and third channels are not in fluid communication, and a second end position wherein the tubular valve body bears against the second valve seat whereby the first and second channels are not in fluid communication and the first and third channels are in fluid communication, and a temperature sensitive switch for moving the tubular valve body between the first and second positions, the valve housing further including a peripheral casing wall extending from the outer attachment means attached to the tubular valve body at a location spaced from the second valve seat, and a closed end portion whereby when the tubular valve body is in the second end position the closed end wall portion closes the second opening of the tubular valve body. In a preferred embodiment, the valve housing opening extends radially around the closed end wall portion of the valve housing, and the valve includes a plurality of bridging members bridging the valve housing opening to support the closed end walled portion thereon.
In accordance with one embodiment of the thermostat valve of the present invention, the peripheral casing wall includes sealing means for sealing the peripheral casing wall to the tubular valve body. Preferably, the peripheral casing wall includes an end portion distal from the outer attachment means defining an end opening for the tubular valve body, and the sealing means is disposed at the end portion of the peripheral casing wall.
In accordance with another embodiment of the thermostat valve of the present invention, the first and second channels are in communication with the valve chamber substantially axially, and the third channel is in communication with the valve chamber substantially radially.


REFERENCES:
patent: 3157357 (1964-11-01), Bailey et al.
patent: 4055298 (1977-10-01), Wilson
patent: 4314664 (1982-02-01), Wisyanski
patent: 4537346 (1985-08-01), Duprez
patent: 4562953 (1986-01-01), Duprez et al.
patent: 5018664 (1991-05-01), Butler
patent: 5261597 (1993-11-01), Perlman et al.

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