JPH08135445A - Thermostat device for engine - Google Patents

Abstract

PURPOSE: To prevent interference of the movable part of a heat sensitive operating part and a bulk head and carry out down-sizing of a thermostat device by forming a relief part on the bulk head for defining a passage chamber which is connected to a cooling water passage and a thermostat chamber while opposing to the movable part of the heat sensitive operating part. CONSTITUTION: In a thermostat device 22 which is mounted in an engine cooling device, a nearly cylindrical thermostat case 23 is sectioned into two chambers of a passage chamber 25 and a thermostat chamber 26 by a bulk head 24, and a thermostat 18 is installed in the inlet opening port 28 of the thermostat chamber 26. In the thermostat 18, a heat sensitive operating part 19 is inserted in the thermostat chamber 26, and a main body case 31 is held and fixed between a flange part 30 and a cap 9. In this case, a part which is opposed to a wax case 20 as a movable part in a bulk head 24, is formed as a release part 33 for housing the top end part of the wax case 20 by expanding to the passage chamber 25 side, and thereby, interference of the wax case 22 and the bulk head is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an engine thermostat device mounted on a cooling device of an engine such as an automobile to control the flow of cooling water.

[0002]

2. Description of the Related Art An example of a conventional thermostat device will be described with reference to FIG. In the thermostat device 1, the inside of the thermostat case 2 is defined by a partition wall 3 into a passage chamber 4 and a thermostat chamber 5. In the passage chamber 4, the inlet opening 6 is directly communicated with the outlet side of the cooling water passage of the engine body 7. The thermostat chamber 4 is connected to the outlet side of the radiator 11 via a main inlet passage 10 of a cap 9 attached to the inlet opening 8.

The passage chamber 4 is connected to the inlet side of the radiator 11 by a main outlet pipe line 12 and is connected to the inlet side of a heater 14 by a sub outlet pipe line 13. The thermostat chamber 5 is connected to the suction side of the water pump 16 by a pump line 15, and the heater 14 is connected by a sub-inlet line 17.
Is connected to the exit side of. The discharge side of the water pump 16 is connected to the inlet side of the cooling water passage of the engine body 7.

A thermostat 18 is attached to the inlet opening 8 of the thermostat chamber 5. Thermostat 18
Is a main inlet passage 10 and a thermostat in which a valve (not shown) is opened / closed according to the temperature of the cooling water by a temperature-sensing operating unit 19 inserted in the thermostat chamber 5 (open at high temperature, closed at low temperature). The chamber 5 is communicated with and cut off from the inside.

With this configuration, when the engine cooling water temperature is low, the thermostat 18 is closed and the water pump 16
The cooling water discharged from the engine main body 7, the passage chamber 4,
It flows into the sub outlet line 13, the heater 14, the sub inlet line 17, the thermostat chamber 5 and then returns to the water pump 16 to cause the radiator.
Bypassing 11, the cooling water temperature rise is promoted,
The warm-up time is shortened and the temperature reaches the proper temperature quickly.

When the temperature of the cooling water reaches the normal operating temperature, the thermostat 18 opens, and the cooling water discharged from the water pump 16 is discharged from the passage chamber 4 to the main outlet pipe line 12 in addition to the flow passage during the warming up. It flows to the radiator 11, the main inlet passage 10, and the thermostat chamber 5, and the proper temperature is maintained by heat exchange of the radiator 11.

In this way, the thermostat 18 is opened and closed according to the temperature of the cooling water to switch the flow path of the cooling water, and the flow rate of the cooling water to the radiator 11 is controlled to shorten the warm-up time of the engine. Also, it is possible to maintain an appropriate temperature during normal operation.

[0008]

However, the above-mentioned conventional thermostat device 1 has the following problems. Generally, in the temperature sensitive operation part 19 of the thermostat 18, the shaft 21 is inserted into the wax case 20 having wax sealed therein, the shaft 21 side is fixed, and the wax case 20 is moved forward and backward by expansion and contraction of the wax due to temperature. It is designed to open and close the valve. For this reason, it is necessary to provide a sufficient gap c between the wax case 20 and the partition wall 3 so that the wax case 20 which is a movable portion does not interfere with the partition wall 3 when the temperature sensitive operation unit 19 operates. On the other hand, in the passage chamber 4, it is necessary to secure a sufficient passage cross-sectional area A ₁ toward the main outlet pipeline 12 side. As a result, the thermostat case 2
However, the size L _{1 of each of the two} becomes large, which causes layout restrictions and an increase in weight.

The present invention has been made in view of the above points, and an object thereof is to downsize a thermostat device.

[0010]

In order to solve the above problems, the present invention defines the inside of a thermostat case by a partition into a passage chamber to which a cooling water passage is connected and a thermostat chamber. In a thermostat device of an engine, which is provided with a temperature-sensing operation part of a thermostat in a room and controls the flow of cooling water in the cooling water passage by opening and closing the thermostat according to the temperature of cooling water in the thermostat room, An escape portion is formed in the partition wall so as to face the movable portion of the temperature operating portion.

[0011]

With this structure, the escape portion prevents interference between the movable portion of the temperature-sensitive operating portion and the partition wall.

An embodiment of the present invention will be described below in detail with reference to the drawings. The same members as those shown in FIG. 2 will be described with the same reference numerals.

As shown in FIG. 1, the thermostat device 22
The partition wall 24 is formed in the substantially tubular thermostat case 23, and the partition wall 24 divides the interior of the thermostat case 23 into two chambers, a passage chamber 25 and a thermostat chamber 26. The entrance opening 27 of the aisle chamber 25 has a thermostat case 23.
A flange portion 28 on one end side of the engine body 7 is directly connected to the outlet side of the cooling water passage of the engine body 7 by being coupled to the engine body 7. Entrance opening 29 of thermostat chamber 26
Is communicated with the outlet side of the radiator 11 via the main inlet passage 10 of the cap 9 attached to the flange portion 30 on the other end side of the thermostat case 23.

The side wall of the thermostat case 23 is provided with a main outlet line 12 connecting the passage chamber 25 to the inlet side of the radiator 11 and an auxiliary outlet line 13 connecting to the inlet side of the heater 14 serving as a bypass passage. Cage, thermostat room
Pump line 15 connecting 26 to the suction side of water pump 16
Further, a sub-inlet pipe line 17 connected to the outlet side of the heater 14 is provided. The discharge side of the water pump 16 is connected to the inlet side of the cooling water passage of the engine body 7.

A thermostat 18 is attached to the inlet opening 28 of the thermostat chamber 26. Thermostat 18
Is the temperature-sensitive operating portion 19 is inserted into the thermostat chamber 26,
The body case 31 is sandwiched and fixed between the flange portion 30 and the cap 9.

In the temperature-sensitive operating portion 19, one end side of a shaft 21 is inserted into a wax case 20 in which wax is sealed, the other end side of the shaft 21 is connected to a main body case 31, and the wax case 20 serves as a cooling water passage. It is connected to a valve (not shown) that opens and closes. Then, the wax is expanded and contracted by the temperature to move the wax case 20 forward and backward to open and close the valve, and when the temperature is low, the valve is closed by the urging force of the spring 32. The valve is opened by moving in a direction projecting from the main body case 31 against the biasing force.

The partition wall 24 is a temperature-sensitive operating portion of the thermostat 18.
An escape portion 33 that bulges a portion of the wax case 20 facing the wax case 20 toward the passage chamber 25 and accommodates the tip of the wax case 20.
Are formed. The partition wall 24 is a wax case.
Compared to the conventional example shown in FIG. 2, the 20 is formed in a portion closer to the inlet opening 29 of the thermostat chamber 26 by the amount accommodated in the escape portion 33, and the wax case 20 is the most separated from the main body case 31. Even in the protruding state (the valve is fully opened), the escape portion 33 is not interfered with.

The operation of the present embodiment configured as above will be described below.

As in the conventional example shown in FIG. 2, when the temperature of the cooling water of the engine is low, the thermostat 18 is closed and the cooling water discharged from the water pump 16 is supplied to the engine body 7, the passage chamber 25 and the sub outlet. Pipe line 13, heater 14, auxiliary inlet pipe line 1
7. Flowing into the thermostat chamber 26, returning to the water pump 16 and bypassing the radiator 11, the rise of the cooling water temperature is promoted, the warm-up time is shortened, and the temperature becomes appropriate.

When the temperature of the cooling water reaches the normal operating temperature, the thermostat 18 opens, and the cooling water discharged from the water pump 16 is discharged from the passage chamber 25 to the main outlet pipe 12, in addition to the flow passage during the warming up. It flows to the radiator 11, the main inlet passage 10, and the thermostat chamber 26, and the proper temperature is maintained by heat exchange of the radiator 11.

In this manner, the thermostat 18 is opened and closed according to the temperature of the cooling water to switch the flow path of the cooling water, and the flow rate of the cooling water to the radiator 11 is controlled to shorten the warm-up time of the engine. Also, it is possible to maintain an appropriate temperature during normal operation.

Further, since the escape portion 33 is formed and the partition wall 24 is arranged at a portion close to the inlet opening 29 of the thermostat chamber 26 without interfering with the wax case 20 of the temperature sensitive operating portion 19, the partition chamber 24 can be removed from the passage chamber 25. The passage sectional area A ₂ to the outlet pipe 12 can be made sufficiently large, and the dimension L ₂ of the thermostat case 23 can be made small. This allows
The thermostat device 22 can be reduced in size and weight, and space efficiency can be improved.

In the present embodiment, as an example, the thermostat chamber is arranged on the inlet side of the cooling water passage of the engine body, but the present invention is not limited to this, and the thermostat chamber is not limited to this. As long as the thermostat device has a passage chamber defined by a partition wall, the thermostat device can be similarly applied to a device having a different arrangement of cooling water passages.
Further, the thermostat is not limited to the wax type of the above-mentioned embodiment, but other types can be used as long as the movable part of the temperature-sensitive operating part moves back and forth with respect to the partition wall.

[0024]

As described above in detail, in the thermostat device for an engine according to the present invention, the escape portion is formed in the partition between the thermostat chamber and the passage chamber so as to face the movable portion of the temperature-sensitive operation portion of the thermostat. Therefore, the interference between the movable portion and the partition wall is prevented. As a result, the partition wall can be arranged closer to the thermostat chamber side, and the passage cross-sectional area from the passage chamber to the cooling water passage can be made sufficiently large, so the thermostat device can be made compact and lightweight, and space efficiency can be improved. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional thermostat device.

[Explanation of symbols]

 18 Thermostat 19 Temperature-sensing part 20 Wax case (movable part) 23 Thermostat case 24 Partition wall 25 Passage chamber 26 Thermostat chamber 33 Relief part

Claims (1)

[Claims] 1. A thermostat chamber is divided into a passage chamber to which a cooling water passage is connected and a thermostat chamber by a partition, and a thermostat temperature-sensing operation unit is provided in the thermostat chamber, and cooling water in the thermostat chamber is provided. In an engine thermostat device in which the flow of cooling water in the cooling water passage is controlled by opening and closing the thermostat according to temperature, an escape portion is formed in the partition wall so as to face the movable portion of the temperature sensitive operation portion. The engine thermostat device characterized by