JP2660773B2 - Thermostat / water pump mounting device with inlet control for engine water cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostat / water pump mounting apparatus for controlling the inlet of a water cooling system for an engine.

[0002]

[Prerequisite Structure] The inlet control type thermostat / water pump mounting device of the water cooling system for an engine of the present invention is assumed to have the following prerequisite structure as shown in FIGS. 1 and 2, for example. That is, the water jacket 2 of the engine 1 is connected to the water jacket 2 through the radiator 3, the thermostat 4, and the water pump 5 so as to circulate in that order. Further, a stat housing 7 of the thermostat 4 and a pump housing 8 of the water pump 5 are fixed to the front surface 6a of the cylinder block 6 of the engine 1. The pump rotor 9 is mounted on the pump housing 8 and the pump lid 10 is fixed. Further, the thermostat 4 is mounted on the stat housing 7 and the stat inlet side lid 11 is fixed. In this state, the outlet vicinity 2a of the water jacket 2
To the stat housing 7 via a bypass path 12.
Is communicated with the stat outlet side chamber 7a. A bypass valve 13 for opening and closing the communication between the bypass passage 12 and the stat outlet side chamber 7a is attached to the thermostat 4 so as to be openable and closable. Further, cooling water can be circulated and supplied from the water jacket 2 to the radiator 21 for indoor heating by the water pump 5.

[0003]

2. Description of the Related Art As a concrete example of the above premise structure, there is a prior art as shown in FIG. The stat housing 7 and the pump housing 8 are formed separately from each other,
It is separately attached to the front surface 6a of the cylinder block 6. A stat outlet side chamber 7 a of the stat housing 7 is connected to a pump suction chamber 8 a of the pump housing 8 by a thermostat outlet pipe 20. The bypass passage 12 includes a bypass pipe 22. The bypass pipe 22 is connected to the cylinder head 15 and the stat housing 7. The bypass valve seat 12 b of the bypass valve 13 is formed on the inner surface of the stat housing 7. When the engine cooling water is used for room heating, the return port 8 c of the cooling water from the heat radiator 21 is formed in the stat housing 7.

[0004]

The above prior art has the following problems. (A) The number of parts is large because the stat housing 7 and the pump housing 8 are required separately, and the thermostat outlet pipe 20 and the bypass pipe 22 are required. (B) Since the thermostat 4 and the water pump 5 are separately pre-assembled and attached separately to the front surface 6a of the cylinder block 6, the number of assembly steps is large. (C) Since the return port 8c of the cooling water from the heating radiator 21 is formed in the stat housing 7, the passage resistance to the pump suction chamber 8a is large, and the cooling water cannot circulate sufficiently quickly. Rises slowly. The present invention, in configuring the thermostat 4 and the water pump 5, to reduce the number of parts, and thereby reducing the assembling steps, to speed up the rise of the chamber heater in the case of utilizing the cooling water for room heating Make things an issue.

[0005]

According to the present invention, in order to achieve the above-mentioned object, the present invention has a structure having the following characteristic structure as shown in FIGS. 1 and 2, for example. is there. The stat housing 7 is formed in parallel with and integral with the pump housing 8. The stat outlet side chamber 7a opens to the rear surface of the stat housing 7. Further, the bypass passage 12 is formed in both wall surfaces of the cylinder head 15 and the cylinder block 6 of the engine 1. The outlet 12a of the bypass 12 is
An opening is provided on the front surface 6a of the cylinder block 6 so as to face the stat outlet side chamber 7a. Then, the bypass valve 13 is made openable and closable at a bypass valve seat 12b around the outlet 12a of the bypass passage 12. Furthermore, the return port 8c at the end of the return path 21c of the cooling water for heating, which is derived from the radiator 21 for indoor heating, opens toward the suction chamber 8a of the water pump 5.

[0006]

As described above, the present invention has the following advantages. (I). Since the return port at the end of the return path for the cooling water for heating is opened facing the suction chamber of the water pump, the path length from the return port for the cooling water for heating to the pump rotor is shortened, and the heating There is nothing obstructing the flow of the cooling water from the return port of the cooling water to the pump rotor. For this reason, the passage resistance between the return port of the cooling water for heating and the pump rotor can be reduced. Therefore, the cooling water is easily sucked out from the return port of the cooling water for heating, the circulation efficiency of the engine cooling water to the radiator for indoor heating is improved, and the supply of the engine cooling water to the radiator for indoor heating is improved. The amount can be increased.
This allows the room heating to start up quickly,
Heating efficiency can be improved. As a result, the room can be sufficiently heated even with a small indoor radiator.
That is, even a small cab such as a small tractor to which a large radiator for indoor heating cannot be attached can sufficiently heat the cab with a small radiator for indoor heating. (B). Since the front surface of the cylinder block is used as it is for the bypass valve seat of the bypass valve, simply removing the housing from the cylinder block exposes the bypass valve seat on the front surface of the cylinder block. Maintenance such as cleaning can be easily performed. Further, since the bypass valve seat can be processed simultaneously with the gear case mounting surface on the front surface of the cylinder block, the number of processing steps can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a water-cooled engine with a radiator for indoor heating,
FIG. 2 is a thermostat / water pump mounting device of an inlet control type for an engine water cooling system, and FIG.
It is an X-ray arrow plan view. In the figure, a cylinder head 15 and a head cover 15a are sequentially mounted on the upper side of a cylinder block 6 of the vertical water-cooled engine 1. A piston 18 is vertically slidably inserted into a cylinder 17 in the cylinder block 6, and a crankshaft 19 supported laterally below the cylinder block 6 is interlocked with the piston 18. And the water jacket 2 of the engine 1
Through a radiator 3, a thermostat 4 and a water pump 5 in that order to circulate in the water jacket 2. Also, this water jacket 2
The cooling water can be circulated and supplied from the water pump 5 to the radiator 21 for indoor heating through the cooling water passage 21b for heating.

On the front surface 6a of the cylinder block 6 of the engine 1, a stat housing 7 of the thermostat 4 and a pump housing 8 of the water pump 5 are fixed. A pump cover 9 is fixed to the pump housing 8 and a pump lid 10 is fixed. Further, a thermostat 4 is fixed to the stat housing 7 and a stat inlet side lid 11 is fixed. The vicinity 2a of the outlet of the water jacket 2 is
Is connected to the stat outlet side chamber 7a of the stat housing 7 via the. A bypass valve 13 for opening and closing the communication between the bypass passage 12 and the stat outlet side chamber 7a is attached to the thermostat 4 so as to be openable and closable. The engine cooling water cools the cylinder 17 and the cylinder head 15 by the water jacket 2 and absorbs heat to become high-temperature water, radiates heat by the radiator 3 to become low-temperature water, passes through the thermostat 4 and the water pump 5, and then enters the pump housing 8. Is returned to the water jacket 2 from the cooling water passage 8b. The radiator 3 includes a radiator body 3a and a fan 3b. The fan 3b is directly connected to the water pump 5, and is driven by a crankshaft 19 via a pulley 3c and a conduction belt 3d. A hot water outlet 2b of the water jacket 2 is connected to a hot water inlet 3f through a hot water pipe 3e in the radiator body 3a.
Further, the cold water outlet 3g is connected to the cold water inlet 4c of the thermostat 4 via the cold water pipe 3h.

The stat housing 7 is integrally formed in parallel with the pump housing 8. The stat outlet side chamber 7a opens to the rear surface of the stat housing 7. The bypass path 12 is formed in both the wall of the cylinder head 15 and the cylinder block 6 of the engine 1. The outlet 12a of the bypass passage 12 is provided at the front surface 6a of the cylinder block 6 with the stat outlet side chamber 7.
Open to face a. Further, a bypass valve 1 is provided in a bypass valve seat 12b around an outlet 12a of the bypass passage 12.
3 can be opened and closed. On the other hand, the indoor heating radiator 21
A cooling water return port 8c is connected to a pump suction chamber 8a in the pump housing 8. In the case of using the indoor heating, high-temperature cooling water is radiated from the hot water outlet 2b of the water jacket 2 through the heating radiator 21 through the heating cooling water passage 21b to radiate heat. Send it indoors. Thereafter, the cooling water is supplied to the return path 21c.
Through the return port 8c at the terminal end to the water pump 5.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a cross-sectional view of a main part of a water-cooled engine with a radiator for indoor heating.

FIG. 2 (A) shows an embodiment of the present invention, FIG. 2 (A) is a sectional view of an essential part of an inlet-controlled thermostat / water pump mounting device of an engine water cooling system, and FIG. -It is an X-ray plan view.

FIG. 3 is a view showing a conventional example and corresponding to FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Water jacket, 2a ... Outlet vicinity, 3 ... Radiator, 4 ... Thermostat, 5 ... Water pump, 6 ... Cylinder block, 6a ... Front, 7 ...
Stat housing, 7a: Stat outlet side chamber, 8: Pump housing, 8a: Pump suction chamber, 8c: Return port,
9: pump rotor, 10: pump lid, 11: stat inlet side lid, 12: bypass passage, 12a ... outlet, 12b ... bypass valve seat, 13 ... bypass valve, 15 ... cylinder head, 21 ... heating radiator, 21c ... the return path.

Claims (1)

(57) [Claims] 1. A water jacket (2) for an engine (1).
Through a radiator (3), a thermostat (4) and a water pump (5) in that order, so as to circulate through the water jacket (2), and the front (6a) of the cylinder block (6) of the engine (1). ), The above thermostat (4)
Stat housing (7) and the water pump (5)
The pump housing (8) is fixed, the pump housing (8) is provided with a pump rotor (9), and a pump lid (10) is provided.
The thermostat (4) is mounted inside the stat housing (7), the stat inlet side lid (11) is fixed, and a bypass path (12) is passed through the water jacket (2) near the outlet (2a). The stat outlet side chamber (7a) in the stat housing (7) is communicated through the bypass passage (1).
A bypass valve (13) for opening and closing the communication between 2) and the stat outlet side chamber (7a) is attached to the thermostat (4) so as to be openable and closable, and from the water jacket (2) to the radiator (21) for indoor heating. In an inlet-controlled thermostat / water pump mounting device for an engine water cooling device configured to be capable of circulating and supplying cooling water by a water pump (5), the stat housing (7) is integrally arranged in parallel with the pump housing (8). Forming said stat outlet side chamber (7a)
Is opened at the rear surface of the stat housing (7), and the bypass passage (12) is connected to the cylinder head (15) of the engine (1).
And the outlet (12a) of the bypass passage (12) is formed in the front wall (6a) of the cylinder block (6).
At the exit (12) of this bypass passage (12).
The bypass valve (1) is provided in the bypass valve seat (12b) around the a).
3) openably open and close, the radiator for indoor heating (21)
The return port (8c) at the end of the return path (21c) for the cooling water for heating, which is derived from the suction chamber (8) of the water pump (5),
An inlet-controlled thermostat / water pump mounting device for an engine water cooling device, characterized in that it is open to face a).