JPS60142010A - Engine cooling device - Google Patents

Abstract

PURPOSE:To control the flow rate of a cooling water in accordance with thermal loading by controlling the rotating speed of a water-pump drive electric motor, which is separated from the engine drive system, in accordance with the temperature change in the cooling water. CONSTITUTION:The rise of water temperature within the cooling wster jacket in an engine 5 is detected by a water temperature sensor 9, which is sent to a control circuit 10. When the water temperature gets higher than the prescribed value, the circuit 10 causes an electric motor 11 to operate, and thereby a water pump 1 is made to operate. The electric motor 11 is separated from the engine drive system. In this way, the water pump can be controlled independently of the engine rotating speed, and therefore it can be controlled in accordance with thermal loading.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a cooling device for an engine mounted on a motorcycle, an automobile, or the like.

(Prior art) The pump shaft of the cooling water pump is
Since it is interlocked and connected to the crankshaft gear via a 1J gear etc., it has the following problems.

(al) Since a mechanically driven pump is used, the water temperature is kept at the required temperature to ensure a cooling water flow rate suitable for the running horsepower, but the pump does not operate even when the control valve is closed. Since it operates in proportion to the engine speed, there is a horsepower loss.

(b) Mechanically driven pops must be connected to some driving part of the engine, and must also be installed at approximately the lowest position in the cooling system, so there is little freedom in placement.

(Objectives of the Invention) la) To make it possible to control the pump regardless of the engine speed and to change the flow rate of cooling water according to the heat load from the engine, thereby eliminating unnecessary horsepower loss.

(b) By increasing the degree of freedom in placing pops, an optimal layout can be easily obtained.

(Structure of the Invention) FIG. 1 shows the layout of an engine cooling device according to the present invention. In FIG. 1, the cooling water suction port 2 of the cooling water pump l (water pump) is connected to the engine 5 of the hiator 4.
The cooling water jug 7 is connected to the outlet 6. Also, the cooling water discharge lower of the pump 1 is connected to the cooling water jacket of the engine 5. The engine 5 is provided with a water temperature sensor 9 consisting of a thermistor or the like that detects the water temperature in the cooling water jacket, and the temperature detected by the sensor 9 is input as an electric signal to a control port 10. It has become. The circuit is composed of a microcontroller and the like, and is capable of controlling the DC motor 11 for driving the pump l. For example, as a control method,
It is conceivable to control the rotation speed of the motor 11 depending on the water temperature, and to stop the rotation of the motor 11 when it is not necessary. As the motor 11, for example, a 6V DC motor is used, which can be rotated by a battery (not shown) installed in a car or the like. A rotating shaft 12 of the motor 11 is connected to a pump shaft 16 of the pump 1.

Although the pump l may be installed on the engine 5.

For example, a cooling water pump chamber 17 is formed in the housing 15 of the 0.degree.

The pump shaft 16 has a bearing 1 on the nozzle portion 15a of the housing 15.
The distal end portion is rotatably supported by the housing 15 via a bush 19. pump shaft 1
An impeller 21 having a plurality of blades 20 is fixed to the shaft 16, and between the shaft 16 and the boss portion 15a are an oil seat/I/22□ and a water seat 1v23 that are fitted into the boss portion 15a.
is sealed by. The coil spring 24, whose one end is fixed to the water sink/I/23, has its other end pressed against the thrust receiving seal 26 and the seal receiver 27, which are press-fitted into the impeller 21, via the seal member 25. It seals the water. Water V −/l/ 23, spring 24
, the seal member 25 is a non-rotating member. The thrust receiving seal 26 and the seal receiver 27 are rotating members fixed to the impeller 21, and the seal member 25 is a thrust receiving seal I.
It is designed to slide against the v26.

Next, the operation will be explained. When the engine 5 is started, the temperature of the engine 5 rises, and the water temperature sensor 9 detects the rise in the temperature of the cooling water in the cooling water jacket inside the engine 5 and sends a signal to the control circuit IO. When the water's temperature exceeds a predetermined value, the circuit
O operates the DC motor 11, thereby pump 1
starts operating.

When the pump shaft 16 is rotated by the motor 11, cooling water is sucked in from the suction port 2, pressurized in the pump chamber 17, and supplied to the engine 5 from the cooling water discharge lower. The cooling water heated by cooling the engine 5 is cooled by dissipating heat in the radiator 4, and then cooled in the pipe 3.
is supplied again to the suction port 2 of the pump l.

While the engine 5 continues to operate, the water temperature is detected by the water temperature sensor 9, and if the water temperature becomes higher than a predetermined temperature, the control circuit 10 is activated to control the motor 11.
speeds up the rotation and increases the amount of cooling water circulated. Further, if the water temperature becomes lower than a predetermined temperature, the control circuit 1O operates to slow down the rotation of the motor 11 and reduce the amount of circulating water.

That is, if the temperature of the engine 5 is to rise due to an increase in the load on the engine 5 or an increase in the rotational speed, the control circuit IO increases the cooling circulation amount of the pump 1 as necessary, and if the load becomes low, the temperature of the engine 5 increases. To suppress wasteful energy consumption by automatically lowering the rotation speed of a pump l.

When the engine 5 is stopped, the control circuit 10
The pump 1 may also be stopped by stopping the operation of the pump 1, but the control may be performed as follows. That is, if the water temperature remains above a predetermined value even after the engine is stopped, the control circuit 10 operates the pump 1, and stops the pop-up 1 after the engine 5 has been sufficiently cooled and the coolant temperature has fallen below the predetermined value. You can also do this.

(Effects of the invention) Can we separate the water pump for engine cooling water from the engine drive system and operate it with an electric motor? In addition, since a control circuit is provided to control the rotation of the electric motor based on changes in the temperature of the cooling water, the following effects can be expected.

+al The pump can be controlled regardless of engine speed,
Since the cooling water flow rate can be changed according to the heat load from the engine, no horsepower loss occurs, and wasteful energy consumption can be suppressed.

(1') Since there is a large degree of freedom in the arrangement of the pump, an optimal layout can be easily obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the layout of a cooling device according to the present invention. ■...Water pump, 5...Engine,
10...Control 1 circuit, 11...Motor Diagram 1 procedure correction (self-prompted) 1982 2J: ] 2911 3, Relationship with the name and subject matter Patent 3'[Applicant's office] 1-1, 3-chome Higashiyosaki-cho, Chuo-ku, Kobe City
Name (097) Kawasaki Automobile Industry Co., Ltd. Representative Call for Atsutani 1
lli Hiroshi 4, agent address: 2-chome Higashitenma, Kita-ku, Osaka [19-4?] i-F fee 1
Tsuki Building East Building 10th Floor〈■530) 5, Date of Correction Order''
Date of dispatch: Showa, month 1'' 6. Subject of amendment: Application - (and details μm 7. Contents of amendment: Application, specification) Issue V: (No change in content). 8 Attached list of pH classes Request, specification 1 copy each 1-

Claims (1)

[Claims] x 7 The water pump for the Schiff's cooling water is separated from the engine drive system and operated by an electric motor, and the control circuit that controls the rotation of the electric motor is adjusted in response to changes in the temperature of the cooling water. An engine cooling device characterized by being provided with.