JPS6255413A - Cooling device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To miniaturize the peripheral part of an engine as a whole by separating a water pump for cooling water circulation from the engine itself so as to drive it electrically. CONSTITUTION:Rotors 2, 3 are rotatably housed inside chambers 1a, 1b formed independently inside a housing 1. Electrification of stator coils 13, 14 makes the rotors 2, 3 electromagnetically rotate, and the blade 4 of the rotor 2 sucks cooling water from a suction inlet 7, and discharges it through an exhaust port 8 for circulation of cooling water. On the other hand, the rotor 3 made of a permanent magnet acts as the rotor of a fan motor, rotating a fan 11 to suck air from a radiator 10 for promotion of heat radiation of cooling water. The stator coils 13, 14 can be electrified independently, and its switching can change pumping capacity, and when only the stator coil 13 is electrified, cooling water circulating is possible with low capacity with the fan stopped from functioning.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling device for an internal combustion engine (hereinafter referred to as engine).

(Prior art) In a water-cooled engine, cooling water is circulated and the heat is radiated by a radiator, but a water pump that is directly connected to the engine or connected with a fan belt is used to circulate the cooling water. A fan connected to the engine with a fan belt is used to suck air from the radiator. Although some types of fan drive systems use electric motors, water pumps are still driven by engines. the result,
The circulation of cooling water is performed in conjunction with the engine, but the temperature of the engine is low immediately after starting.

Cooling it warps and reduces efficiency.

Therefore, for example, as shown in Japanese Patent Application Laid-Open No. 49-108450, the cooling water circulation path is switched depending on the water temperature so that the circulation to the radiator is not performed at low temperatures.
Ru.

As the conventional water pumps are mechanically linked to the engine, it is difficult to install them separately, which hinders engine miniaturization, poses an obstacle to engine inspection and repair, and also prevents cooling. Even when water circulation is not required, its operation cannot be stopped, so there is a problem in that it is necessary to switch the flow path.

Furthermore, driving the water pump with a fan belt imposes a single load on the pump shaft, leading to early damage to the bearing and causing water leakage from the seal portion.

(Purpose) The present invention enables a water pump for circulating cooling water to be separated from the engine body and driven electrically, and is housed in the same housing as the radiator fan motor, thereby reducing the size of the engine surroundings as a whole. The purpose is to make repairs easier and eliminate the need for seals on the rotating parts of the water pump, eliminating the risk of water leakage.

(Structure) In order to achieve the above object, the present invention includes a
A chamber for rotatably housing the rotors of a plurality of electric water pumps independently of each other and a chamber for rotatably housing the rotor of a single radiator fan motor are formed, and each rotor accommodates the rotor. A magnetic field from a stator coil placed outside the chamber is applied to generate magnetic rotational force, and the rotor chamber of the electric water pump is provided with an inlet and a discharge port to serve as a water pump chamber for circulating cooling water. The fan motor is characterized in that the rotor shaft protrudes outside the housing to fix the fan.

Hereinafter, a detailed explanation will be given based on an example. Figure 1 is the first
This is an example. 1 is a housing with independent chambers 1a and 1b
The rotor 2 of the electric water pump is installed in the chamber la.
A rotor 3 of a radiator fan motor is rotatably housed in the chamber 1b. The rotor 2 is provided with vanes 4 and permanent magnets 5a and 5b in order to function as a rotor of a pump and a rotor of a motor. Note that various types of pumps other than the impeller type can be used as the pump, and the type of the rotor can be changed accordingly. In any case, this part will be submerged in water, so
Models that require electrical wire connection to the outside are not suitable. Since the rotor 2 is rotatably supported within the chamber la, its shaft 6 does not protrude outside the chamber la, so there is no need to provide a seal to prevent water leakage. 7 is an inlet, and 8 is an outlet.

Since the rotor 3 functions only as a motor, it is composed of a permanent magnet or a rotor yoke having a permanent magnet on the side facing the stator coil, and its shaft 9 protrudes outside the housing 1, and the wind from the radiator 10 is shown by arrow A. A fan 11 for suctioning is fixed at the tip, and the shaft 9 has a bearing 12.
It is supported by a shaft. Permanent magnets 5a, 5b and a stator coil 13 are disposed outside the chambers 1a and 1b, facing the rotor 3.
, 14 are arranged, and the magnetic field of the stator coil generates a magnetic rotational force in the rotor 2.3.

Next, the effect will be explained. The rotor 2.3 is electromagnetically rotated by energization of the stator coils 13.14, and the blades 4 of the rotor 2 suck in cooling water from the suction lower and discharge it from the outlet 8 to circulate the cooling water. On the other hand, the rotor 3 made of a permanent magnet acts as a rotor of the fan motor, and the fan 11
is rotated to take in air from the radiator 10 and promote heat dissipation from the cooling water. The stator coils 13 and 14 can be energized independently, and the pump capacity can be changed by switching between them.
If only 3 is energized, the cooling water can be circulated at low capacity only when the fan 11 is stopped. Further, the amount of current applied to the stator coils 13, 14 may be controlled depending on the water temperature.

Note that if the rotation of the rotor 3 is made independent without depending on the coil 14, it may be dangerous to make the circulation of cooling water and the drive of the fan 11 independent.

FIG. 2 shows a second embodiment in which a housing 20 has a chamber 2 that communicates with the housing 20.
0a, 20b, and an independent chamber 20c are formed, and the rotor 21.22 of the electric water pump is connected to the chamber 20a, 20b.
A rotor 23 of one fan motor is provided in the chamber 20c so as to be able to rotate independently.

The stator coils 24, 25, 26, 27 act on a rotating magnetic field, and the stator coil 28 acts on the rotor 23. 30 is an inlet port 31, 32 is an outlet port, and 33 is a fan.

The operation is similar to that of the first embodiment.

(Effects) According to the present invention, the housing includes a chamber in which the rotors of one or more electric water pumps are rotatably accommodated independently of each other, and a chamber in which the rotor of a single radiator fan motor is rotatably accommodated. The electric water pump rotor chamber has an inlet and a discharge port. An outlet is provided to create a water pump chamber for cooling water circulation, and the rotor shaft of the radiator fan motor protrudes outside the housing to fix the fan.The water pump is separated from the engine body and driven by an electric motor, eliminating the need for circulating cooling water. The water pump can be stopped at low temperatures, preventing a drop in engine efficiency due to overcooling without switching the flow path, and the water pump can be installed separately from the engine body. As a whole, the surrounding area of the engine can be made smaller, and it does not interfere with inspection, repair, etc. of the engine body. Furthermore, the rotor of the electric water pump and the rotor of the fan motor can be rotated independently of each other, and electromagnetic rotational force is applied to them through the pump housing, so that the rotating shafts of the fan motor and electric water pump penetrate through the pump housing. This eliminates the problem of applying seals to the rotating parts to prevent water leakage, and eliminates the risk of water leakage. Furthermore, since the stator coils are provided outside each rotor chamber, there is no risk of poor insulation.

According to the second embodiment, the rotor chamber itself of the electric water pump can be arranged in a plurality of pieces. Since each rotor can be rotated independently of each other, the pump's discharge capacity can be improved, and each rotor can be selectively controlled, greatly improving the pump's discharge capacity. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a first embodiment of the invention, and FIG. 2 is a sectional side view of a second embodiment of the invention. 1.20...Housing 1a, lb, 20a, 20b, 20cm chamber 2.3.21
．． 22.23...Rotor 4...Blades 5a, 5b...Permanent magnet 7.30...Intake port 8.31.32...Outlet port 11.33...Fan

Claims (1)

[Claims] A chamber for rotatably accommodating the rotors of one or more electric water pumps independently of each other and a chamber for rotatably accommodating the rotor of a single radiator fan motor are formed inside the housing. The rotor chamber of the electric water pump is provided with a suction port and a discharge port to generate a magnetic rotational force by applying a magnetic field from a stator coil disposed outside the chamber housing the rotor. A cooling device for an internal combustion engine that has a pump chamber and a radiator fan motor whose rotor shaft protrudes outside the housing to secure the fan.