JPH09144538A - Engine water cooling system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a water cooling device of an engine, a convex portion (15) is provided on an inner peripheral surface of a hot water outlet pipe (3), and a support leg is inserted when the thermostat valve (5) is inserted into the hot water outlet pipe (3) through an opening (4). When 9 is in a position facing the bypass passage inlet 14,
The insertion is completed only when the support leg 9 interferes with the convex portion 15 and the insertion is blocked, and the support leg 9 is in a position not facing the bypass passage inlet 14. [Effect] The bypass passage inlet 14 is not covered by the support legs 9, and the proper function of the bypass passage 13 is ensured.
The circulation of the cooling water performed through the bypass passage 13 is maintained well, the cooling performance is high, and the seizure of the piston hardly occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine water cooling device, and more particularly to a device capable of ensuring an appropriate function of a bypass passage.

[0002]

2. Description of the Related Art A conventional water cooling system for an engine is shown in FIG. This is similar to the present invention in FIG.
As shown in (C), the water jacket 102 of the engine body 101 is provided with the hot water outlet pipe 103, and
As shown in (B), a thermostat valve 105 is inserted into the hot water outlet pipe 103 through the opening 104 thereof, and the flange portion 106 of the thermostat valve 105 is seated on the mounting seat 107 of the opening 104, so that the flange portion 1
A plurality of support legs 10 supporting the spring receiving seat 108 from 06.
As shown in FIG. 1C, the cooling water inlet 1 of the water jacket 102 is connected to the hot water outlet pipe 103 via the radiator 110 and the water pump 111.
12, the bypass passage 1 is provided between the hot water outlet pipe 103 and the pump suction port 111a of the water pump 111.
1, a bypass passage inlet 114 is formed on the inner peripheral surface of the hot water outlet pipe 103 as shown in FIGS. 1 (A) and 1 (B).

In this type of water cooling device, when the temperature of the cooling water in the water jacket 102 is below a predetermined temperature,
The thermostat valve 105 maintains the closed state, and the cooling water thereof is not sent to the radiator 110 and circulates only between the water jacket 102 and the water pump 111 via the bypass passage 113. When the temperature of the cooling water in the water jacket 102 exceeds a predetermined temperature, the thermostat valve 105 opens and the cooling water circulates between the water jacket 102 and the radiator 110.

In this prior art, since there is no means for optimizing the insertion posture of the thermostat valve 105 into the hot water outlet pipe 103, when the thermostat valve 105 is inserted into the hot water outlet pipe 103 from its opening 104, the supporting leg is provided. There is a case in which the thermostat valve 105 is fixed to the hot water outlet pipe 103 while keeping the posture in which the 109 faces the bypass passage inlet 114.

[0005]

In the above-mentioned prior art, the support leg 109 remains opposed to the bypass passage outlet 113,
The thermostat valve 105 may be fixed to the hot water outlet pipe 103. In this case, since the support leg 109 covers the bypass passage inlet 114, the bypass passage 113
However, the circulation of the cooling water through the bypass passage 113 may be deteriorated, and the piston may be burned due to the deterioration of the cooling performance.

An object of the present invention is to provide a water cooling device for an engine, which can ensure the proper function of the bypass passage.

[0007]

The present invention, as shown in FIG. 1 (A), includes a water jacket 2 of an engine body 1.
1B, a thermostat valve 5 is inserted into the hot water outlet pipe 3 through an opening 4 thereof, and a flange portion 6 of the thermostat valve 5 is attached to the opening 4 as shown in FIG. A plurality of supporting legs 9 and 9 for supporting the spring receiving seat 8 are led out from the flange portion 6 by being seated on the seat 7, and as shown in FIG. 1C, a hot water outlet is provided via a radiator 10 and a water pump 11. A cold water inlet 12 of the water jacket 2 is communicated with the pipe 3, and a bypass passage 13 is provided between the hot water outlet pipe 3 and the pump suction port 11a of the water pump 11, as shown in FIGS. 1 (A) and 1 (B). As described above, the water cooling device of the engine in which the bypass passage inlet 14 is opened on the inner peripheral surface of the hot water outlet pipe 3 is characterized as follows.

That is, as shown in FIGS. 1A and 1B, when the convex portion 15 is provided on the inner peripheral surface of the hot water outlet pipe 3 and the thermostat valve 5 is inserted into the hot water outlet pipe 3 from the opening 4 thereof. When the support leg 9 is in a posture facing the bypass passage inlet 14, the support leg 9 interferes with the convex portion 15 to prevent insertion, and the support leg 9 is not in a posture facing the bypass passage inlet 14. It is characterized in that the insertion is completed only in.

[0009]

In the present invention, the operation and effect of FIG.
As illustrated in (B), the hot water outlet pipe 3 is provided only when the support leg 9 does not face the bypass passage inlet 14.
Since the insertion of the thermostat valve 5 into the bypass passage 13 is completed, the bypass passage inlet 14 is not covered by the support leg 9, and the proper function of the bypass passage 13 is ensured, and the bypass passage 13 is ensured. Good cooling water circulation is maintained, cooling performance is high, and piston seizure hardly occurs.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. In this embodiment, a water cooling device for a vertical overhead valve multi-cylinder engine is used, and its configuration is as follows. That is, as shown in FIG. 1C, the engine body 1 is constructed by assembling the cylinder head 1b on the upper side of the cylinder block 1a, and the cylinder jacket 1a is provided inside the cylinder block 1a.
A water jacket 2 is constructed by internally providing a head jacket 2b and connecting the cylinder jacket 2a and the head jacket 2b to a plurality of water pipes 16.
An engine cooling fan 17 is attached to the front part of the engine body 1, and a radiator 10 is arranged in front of it.

The water jacket 2 of the engine body 1 is provided with a hot water outlet pipe 3, and as shown in FIG. 1 (B), a thermostat valve 5 is inserted into the hot water outlet pipe 3 through its opening 4 and the thermostat valve 5 is inserted. A plurality of support legs 9 and 9 for supporting the spring receiving seat 8 from the flange portion 6 by making the flange portion 6 of the seat portion 5 seat on the mounting seat 7 of the opening portion 4.
1C, the cold water inlet 12 of the water jacket 2 is communicated with the hot water outlet pipe 3 via the radiator 10 and the water pump 11, and the hot water outlet pipe 3 and the pump of the water pump 11 are connected. A bypass passage 13 is provided between the suction port 11a and the hot water outlet pipe 3, and a bypass passage inlet 14 is formed in the inner peripheral surface of the hot water outlet pipe 3.

In this water cooling device, when the temperature of the cooling water in the water jacket 2 is equal to or lower than a predetermined temperature, the thermostat valve 5 maintains the closed state, and the cooling water is not sent to the radiator 10 and is bypassed. It circulates only between the water jacket 2 and the water pump 11 via 13. When the temperature of the cooling water in the water jacket 2 exceeds a predetermined temperature, the thermostat valve 5 opens, and the water jacket 2 and the radiator 10 are opened.
Cooling water circulates between and.

The specific structure of each of the above components is as follows. As shown in FIG. 2A, in the thermostat valve 5, a stay 18 is drawn out from the flange portion 6 to the upper side, a spindle 19 is hung vertically from the center of the stay 18, and a pellet 20 is fitted onto the spindle 19. Then, the synthetic rubber 21 and the wax 22 are accommodated in the pellet 20 in a doubled manner, the valve body 23 is attached to the pellet 20, the valve seat 24 is formed on the flange portion 6, and the spring receiving seat 8 and the valve body 23. The valve element 23 is seated on the valve seat 24 by the spring force of the valve spring 25 provided between

As shown in FIG. 2A, when the temperature of the cooling water around the thermostat valve 5 is lower than a predetermined temperature, the valve element 23 is kept closed by the spring force of the valve spring 25. Two
As shown in (B), when the temperature of the cooling water exceeds a predetermined temperature, the wax 22 melts and its volume expands, and the expanding force moves the pellets 20 in the axial direction of the spindle 19 and the valve body 23. Opens. As shown in FIG. 1 (A), a pair of support legs 9 are arranged on opposite sides with the pellet 20 sandwiched therebetween.

As shown in FIG. 1 (B), the opening 4 of the hot water outlet pipe 3 is covered with a lid 26, and a flange portion 6 is sandwiched between the lid 26 and the hot water outlet pipe 3. The thermostat valve 5 is fixed. The lid 26 is provided with a hot water outlet 27. As shown in FIG. 1C, the radiator 10 is communicated with the hot water outlet 27 via a hot water passage 28, and the radiator 10 is connected to the water pump 11 via a cold water passage 29. Is communicated with the pump suction port 11a.

In this embodiment, in order to ensure the proper function of the bypass passage 3, the convex portion 1 is formed on the inner peripheral surface of the hot water outlet pipe 3.
5 is provided, and when the thermostat valve 5 is inserted into the hot water outlet pipe 3 from the opening 4 thereof, the support leg 9 is connected to the bypass passage inlet 1
4, the support leg 9 has the convex portion 15
The insertion is prevented by interfering with the above, and the insertion is completed only when the support leg 9 is in a position not facing the bypass passage inlet 14.

With such a structure, only when the support leg 9 is in a position not facing the bypass passage inlet 14,
Since the insertion of the thermostat valve 5 into the hot water outlet pipe 3 is completed, the bypass passage inlet 14 is not covered by the legs 9, and the proper function of the bypass passage 13 is ensured, and the bypass passage 13 is secured. The circulation of the cooling water performed via 13 is maintained well, the cooling performance is high, and the seizure of the piston hardly occurs.

A pair of convex portions 15 are arranged along the edge portion of the bypass passage inlet 14 near the insertion end of the thermostat valve 5, and the pair of convex portions 15
A gap 30 is held between the 15 parts. Therefore, compared to the case where the convex portions 15 are formed in series along the edge portion, the resistance of the hot water from the hot water outlet pipe 3 to the bypass passage inlet 14 becomes smaller, and the proper function of the bypass passage 13 is further secured. To be done. The gap 3 between the pair of convex portions 15 and 15
The width 0 is set so that the support leg 9 of the thermostat valve 5 does not enter. The convex portion 15 is integrally formed with the hot water outlet pipe 3 by casting.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and FIG.
1A is a cross-sectional view taken along the line AA of FIG. 1B, FIG. 1B is a vertical sectional side view of a main part, and FIG. 1C is a schematic view of the entire water cooling device.

FIG. 2 is a diagram illustrating a thermostat valve used in an embodiment of the present invention, FIG. 2 (A) showing a valve closed state, and FIG. 2 (B) showing a valve opened state.

FIG. 3 is a diagram illustrating a conventional technique, and FIG.
3B is a cross-sectional view taken along the line AA of FIG. 3B, FIG. 3B is a vertical cross-sectional side view of a main portion, and FIG. 3C is a schematic view of the entire water cooling device.

[Explanation of reference numerals] 1 ... Engine main body, 2 ... Water jacket, 3 ... Hot water outlet, 4 ... Opening portion, 5 ... Thermostat valve, 6 ... Flange portion, 7 ... Mounting seat, 8 ... Spring receiving seat, 9 ... Support leg 10 ... Radiator, 11 ... Water pump, 11
a ... Pump suction port, 12 ... Cold water inlet, 13 ... Bypass passage, 14 ... Bypass passage inlet, 15 ... Convex portion.

Front page continued (72) Inventor Yuzo Umeda 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Shunichi Manwa 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Yoshida Kozo 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory

Claims (1)

[Claims] 1. A water jacket (2) of an engine body (1) is provided with a hot water outlet pipe (3), and a thermostat valve (5) is inserted into the hot water outlet pipe (3) through its opening (4),
The flange portion (6) of the thermostat valve (5) is seated on the mounting seat (7) of the opening (4), and a plurality of support legs (9) for supporting the spring receiving seat (8) from the flange portion (6). ). (9) is led out, the cold water inlet (12) of the water jacket (2) is made to communicate with the hot water outlet pipe (3) through the radiator (10) and the water pump (11), and the hot water outlet pipe (3) ) And the pump suction port (11a) of the water pump (11), a bypass passage (13) is provided, and the bypass passage inlet (14) is opened on the inner peripheral surface of the hot water outlet pipe (3). In the water cooling device of No. 3, when the convex portion (15) is provided on the inner peripheral surface of the hot water outlet pipe (3) and the thermostat valve (5) is inserted into the hot water outlet pipe (3) through the opening (4), the supporting leg ( When 9) is in a position facing the bypass passage inlet (14), the support leg (9) interferes with the convex portion (15) to prevent the insertion, and the support leg (9) is supported. Only when there is the posture of the leg (9) does not face the bypass passage inlet (14), insert were to be completed, water cooling system for an engine, characterized in that.