JPH063143Y2 - Thermostat structure in internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of a thermostat in an internal combustion engine.

(Prior Art) Generally, a radiator of an internal combustion engine is equipped with a thermostat for preventing overcooling of the engine. This thermostat is for preventing the cooling water from flowing to the radiator when the temperature of the cooling water is low, and the conventional one has a structure as shown in FIG.

(Problems to be Solved by the Invention) By the way, the conventional device shown in FIG. 4 has the following problems.

That is, in the conventional thermostat 5, the cooling water sent from the internal combustion engine flows from the bottom bypass passage 1 through the bottom valve 2 along the seki 3, passes through the outlet 7 to the water pump, and flows out from the water pump passage 4. It is going to go. However, in such a structure, although the cooling water flows well along the seki 3, it is difficult to flow around the wax portion 6 of the thermostat 5.

For this reason, the wax portion 6 has a problem that the responsiveness to the rise of the water temperature is deteriorated and the internal combustion engine is overheated.

(Means for Solving Problems) Therefore, in order to solve the above problems in the present invention,
The outlet 7 to the water pump is provided in the vicinity of the wax portion 6.

(Operation) By providing them in close proximity to each other, the cooling water easily flows along the wax portion 6, so that the responsiveness of the wax portion 6 to the rise of the cooling water temperature can be improved.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 3, the thermostat 8 is composed of a water inlet 9 and a thermo housing 10.

Inside the thermostat 8, a main valve 11, a wax portion 12 and a bottom valve 13 are provided. The main valve 11 is for opening and closing the radiator passage 14, and is fixed to the upper portion of the wax portion 12. On the other hand, the bottom valve 13 has a bottom bypass passage 15
And is fixed to the lower portion of the wax portion. The wax portion 12 has the property of expanding and contracting according to the temperature, and in this example, when the cooling water temperature becomes high, the radiator passage 14 is opened (at this time, the bottom bypass passage 15 is closed), and the cooling water temperature becomes low. Then, the radiator passage 14 is closed (at this time, the bottom bypass passage 15 is opened).

The water inlet 9 has a radiator passage 14 described above.
Is provided, and the cooling water from the radiator R flows into this.

Next, a bottom bypass passage 15 and an outlet 16 to the water pump are provided inside the thermo housing 10.

The bottom bypass passage 15 is a passage for sending the cooling water sent from the internal combustion engine E into the thermo housing 10, and is provided in the lower part of the thermo housing 10. A bottom valve 13 is provided at the upper end of the bottom bypass passage 15 so that the bottom bypass passage 15 can be opened and closed.

The outlet 16 to the water pump is a main part in this example, and is configured as follows.

The outlet 16 to the water pump is formed in a substantially quadrangular shape, and is provided near the side of the wax portion 12. The lower portion 16b of the outlet 16 to the water pump is more waxy than the upper portion 16a of the outlet 16 to the water pump.
2, the end face of the outlet 16 to the water pump is curved so as to follow the side face of the wax portion 12 at a constant interval as shown in FIG. . In particular, in this example, the diameter of the curved portion of the outlet 16 to the water pump is made sufficiently larger than the diameter of the wax portion 12 so that the wax portion 12 also extends laterally. The outlet 16 to the water pump communicates with a water pump passage 17 connected to the internal combustion engine E.

The operation and effect will be described subsequently.

When the temperature of the internal combustion engine E is low, the thermostat 8 closes the main valve 11 so that the cooling water from the radiator passage 14 does not flow. At this time, since the bottom valve 13 is open, the cooling water from the internal combustion engine E flows from the bottom bypass passage 15 into the thermo housing 10, passes around the wax portion 12 and flows to the outlet 16 to the water pump. Pump passage 17
It's more flowing.

Particularly in this example, the outlet 16 to the water pump is provided so as to be close to and along the wax portion 12, so that the cooling water flowing from the bottom bypass passage 15 wraps the outer periphery of the wax portion 12. It can flow into the outlet 16 to the water pump.

For this reason, the temperature of the cooling water can be sufficiently transmitted to the wax portion 12. Therefore, when the cooling water temperature rises above the specified temperature, the wax portion 12 immediately detects this and opens the main valve 11 and at the same time the bottom valve is opened. 13 will be closed. Therefore, the cooling water flows from the radiator R through the radiator passage 14 to the outlet 16 to the water pump, is pressure-fed by the water pump (not shown), enters the inside of the internal combustion engine E, and starts cooling immediately.

(Effect of the Invention) As described above, according to the present invention, since the outlet to the water pump is formed in a substantially rectangular shape and is provided close to the wax portion, the cooling water flows so as to wrap the wax portion. be able to. Therefore, since the cooling water temperature can be sufficiently transmitted to the wax portion, the thermostat has a characteristic that it can follow the change of the water temperature well and can operate accurately. Therefore, it is possible to prevent the problem that the temperature of the internal combustion engine unnecessarily rises due to the poor response of the thermostat as in the past.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a thermostat according to the present invention, FIG. 2 is a plan view showing only a thermo housing, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. It is a side sectional view showing an example. 8 ... Thermostat 9 ... Water inlet 10 ... Thermo housing 11 ... Main valve, 12 ... Wax part 13 ... Bottom valve 14 ... Radiator passage 15 ... Bottom bypass passage 16 ... Water pump outlet 17 ... Water pump passage

Claims (1)

[Scope of utility model registration request] 1. A main valve for opening and closing a radiator passage, and a bottom valve for opening and closing a bottom bypass passage, both valves being connected by a wax portion so that when one valve is opened, the other valve is opened. A thermostat structure in an internal combustion engine, wherein a thermostat of a type in which a valve is closed is provided with an outlet to a water pump having a substantially rectangular shape so as to surround and surround the outer periphery of the wax portion.