JPH049508Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an engine cooling water control device.

[Conventional technology]

In vehicle engines, if the engine cooling water is simply circulated between the radiator and the engine, warm-up of the engine will be delayed.
Provide a bypass passage to bypass the radiator,
When an engine is warmed up, all or most of the cooling water from the engine is returned to the engine via a bypass passage. Conventionally, as a device for controlling the flow of cooling water, as shown in Japanese Utility Model Application No. 54-42830, a thermostat that responds to the engine cooling water temperature is used to control the valves in the main passage and the bypass passage. Some devices open and close valves to selectively guide cooling water to a radiator or bypass passage.

However, in the device described in the above-mentioned conventional publication, due to the structure of the device, components of the thermostat such as stays and rods act as resistance to the flow of cooling water after the engine has warmed up, and the flow of cooling water is obstructed. There was a risk that cooling could not be achieved.

[Purpose of invention]

In view of these problems, this invention aims to provide an engine cooling water control device that can guarantee the cooling effect of the engine.

[Structure of the idea]

Considering the flow rate of cooling water during engine warm-up and after engine warm-up, it is generally desirable that the flow rate of cooling water flowing into the engine be small in order to promote warm-up during engine warm-up.
On the other hand, after the engine has warmed up, it is necessary to increase the flow rate of cooling water to ensure the cooling effect of the engine, so even if the flow of cooling water is slightly obstructed when the engine is warmed up, it will not be a big problem. It is considered that this will not occur.

Therefore, in the engine cooling water control device, this idea is to place the engine communication opening closer to the radiator communication opening than the bypass passage opening, and to connect the main valve that opens and closes the radiator communication opening to the engine communication opening. The thermostat body is fixed to the second stay on an extension of the thermostat body fixed by the first stay located in the thermostat housing chamber on the side of the bypass passage, and after the engine warms up, cooling water is supplied to the components. Therefore, the fluid can flow smoothly between the engine communication opening and the radiator communication opening without being obstructed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an engine cooling water control device according to an embodiment of the present invention. In the figure, 1
is an engine, 2 is a radiator, and a cooling water supply passage 3 and a cooling water return passage 4 are provided between the engine 1 and the radiator 2;
A cooling water pump 5 is disposed midway between the cooling water supply passage 3 and the cooling water return passage 4, and a bypass passage 6 for bypassing the radiator 2 is provided between the cooling water supply passage 3 and the cooling water return passage 4.

A cooling water control device 7 that controls the flow of cooling water is disposed at a connection portion between the cooling water supply passage 3 and the bypass passage 6. In this device 7, the casing (thermostat storage chamber) 8 includes a bypass passage 6, a bypass passage opening 9 communicating with the radiator side portion 3a and the engine side portion 3b of the cooling water supply passage 3, and a radiator communication opening. Part 1
0 and an engine communication opening 11 are respectively formed, and the center of the bypass passage opening 9 and the center of the radiator communication opening 10 are arranged approximately on the same line (see dashed line a in FIG. 2), and The engine communication opening 11 is opened close to the radiator communication opening 10 side, and the engine communication opening 1
A concave bypass portion 12 is formed on the side of the first bypass passage opening 9.

Further, the main body 16a of the thermostat 16 is supported on stays 13 and 14 (first stays) provided in the casing 8 above the engine communication opening 11, which has a plurality of slits in the casing 8. A rod 16b of the thermostat 16 is fixed to the second stay.
A temperature sensitive member such as wax is built into the thermostat main body 16a, and the thermostat main body 16a is configured to move up and down depending on the temperature of the cooling water. A bypass valve 17 for opening and closing the bypass passage opening 9 is attached to the upper end of the thermostat main body 16a, and is prevented from coming off by a stopper 19.
A main valve 18 that opens and closes the radiator communication opening 10 is attached to the lower end of the thermostat main body 16a via a mounting portion 18a having a plurality of slits and is biased by the spring member 21. A spring member 22 is disposed between the main valve 18 and the stay 15, and the main valve 18 is thus held on an extension of the thermostat main body 16b.

Next, the operation will be explained.

When the engine 1 operates, the cooling water pump 5 is driven, and cooling water is supplied into the engine 1 (see arrow A in FIG. 1), and the cooling water is sent out from the engine 1 (arrow B in FIG. 1). reference). When the engine is warmed up, since the coolant temperature is low, the thermostat main body 16a is moved downward by the temperature-sensitive member, the bypass valve 17 opens the bypass passage opening 9, and the main valve 18 opens the radiator communication valve. Close the opening 10.
Then, the cooling water flowing through the cooling water return passage 4 flows into the casing 8 via the bypass passage 6 and the bypass passage opening 9 (see arrow C in Figs. 1 and 2), and this cooling water flows around the thermostat body 16a. The water flows through the engine communication opening 11 and the engine-side portion 3b of the cooling water supply passage 3 and is returned to the engine 1 (see arrow D in FIG. 2), thereby promoting warm-up of the engine. .

When the engine warms up, the cooling water temperature becomes high, so the thermostat main body 16a is moved upward by the temperature sensitive member, the bypass valve 17 closes the bypass passage opening 9, and the main valve 18 closes. Open the radiator communication opening 10. Then, the cooling water flowing through the cooling water return passage 4 flows into the radiator 2, where it is cooled (see arrow E in Fig. 1), and then flows through the radiator side portion 3a of the cooling water supply passage 3 and the radiator communication opening. 10 into the casing 8 (see arrow F in FIGS. 1 and 2), most of this cooling water immediately passes through the engine communication opening 11 and the engine side portion 3b of the cooling water supply passage 3. A portion of the cooling water supplied to the engine 1 (see arrow G in FIG. 2) and flowing into the casing 8 flows around the thermostat main body 16a, and flows through the bypass section 12,
Engine communication opening 11 and cooling water supply passage 3
It is fed to the engine 1 through the engine side portion 3b (see arrow H in FIG. 2).

In the device of this embodiment as described above, the engine communication opening is located close to the radiator communication opening, and the main valve for opening and closing the radiator communication opening is provided on an extension of the thermostat body. After the engine has been warmed up, a large amount of cooling water that has flowed in from the radiator communication opening flows smoothly into the engine communication opening without being obstructed by the stay etc., thereby ensuring the cooling effect of the engine.

However, if the cooling water is allowed to flow smoothly from the radiator communication opening to the engine communication opening in this way, the cooling water may stagnate around the thermostat, which may impede the operation of the thermostat. In contrast, this device has a bypass section above the engine communication opening, so some of the cooling water that has flowed in from the radiator communication opening flows around the thermostat and through the bypass section, preventing the thermostat from operating. I can guarantee it.

Furthermore, with the above configuration, when the engine is warmed up, the flow of cooling water that flows in from the bypass passage opening is obstructed by the stay, etc., but the flow rate of the cooling water is small during this warm-up period. Therefore, even if the flow of cooling water is obstructed, no problem will occur.

[Effect of idea]

As described above, according to the present invention, in the engine cooling water control device, the engine communication opening is located closer to the radiator communication opening than the bypass passage opening, and the main valve opens and closes the radiator communication opening. Since it is provided on an extension of the thermostat body fixed by the first stay placed in the thermostat housing chamber on the bypass passage side of the engine communication opening, the flow resistance of cooling water after the engine warms up is reduced. It has the effect of reducing

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an engine cooling water control system according to an embodiment of the present invention, and FIG. 2 is a detailed diagram of the system. 8...Casing (thermostat storage chamber),
9... Bypass passage opening, 10... Radiator communication opening, 11... Engine communication opening,
16a...Thermostat body, 17...Bypass valve, 18...Main valve.

Claims (1)

[Scope of utility model registration request] The center of the bypass passage opening of the thermostat storage chamber and the center of the radiator communication opening are substantially on the same line, and the engine communication opening is opened close to the radiator communication opening side, and the thermostat storage chamber A bypass valve for opening and closing the bypass communication opening is provided at one end of the thermostat main body, which is displaceably attached to a first stay fixed to the side of the bypass passage with respect to the engine communication opening, and is displaceable depending on the temperature. A main valve for opening and closing the radiator communication opening extending on an extension of the thermostat main body is provided at the other end of the thermostat main body and is fixed by a second stay extending from the thermostat main body toward the radiator passage side. An engine cooling water control device characterized by: