JPS62210287A - Water pump - Google Patents

Abstract

PURPOSE:To make it possible to secure a flow rate required for cooling during high speeds even with a smaller impeller diameter by transmitting power by arranging a solenoid joint as a transmitting means operative under a warm condition and connecting a pulley with a shaft directly. CONSTITUTION:When the temperature of coolant water rises and a warm condition is produced, a water temperature switch is turned on, and a solenoid coil 27 is energized. Then, due to its exciting action, a magnetic circuit is formed so that an armature 31 located within the said circuit and interposed in a gap between a flange part 30a facing a pulley 25 and the pulley 25 is attracted to the pulley 25. Due to that, the armature 31 is pressed against the pulley 25, power transmitted to the pulley 25 is transmitted to the armature 31, and the power of the armature 31 is transmitted via a spring seat 32, a rivet 33, a holder 30 and a pulley seat 29 to a shaft 30 to turn an impeller at high speeds. With this constitution, it is made possible to secure a flow rate required for cooling during high speeds even with a smaller diameter of the impeller 14.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a water pump for a water-cooled internal combustion engine, and more particularly, to a water pump that controls the rotation of a pump impeller based on water temperature. It is related to.

(Prior art) As a conventional water pump of this type, Japanese Patent Application Laid-Open No. 60-22
There was one disclosed in Publication No. 019 and shown in FIG.

This water pump 50 is rotatably supported by a pump housing 51, and has a shaft 53 attached to one outer end thereof with a pulley connected to the engine. A case 54 rotatably supported by the shaft 53 via a bearing. A case cover 55 fixed to the case 54 so as to form an internal space, a rotor 56 fixed to the shaft 53 so as to be located in the internal space, an impeller 57 fixed to the case cover 55, and the inside A partition plate 60 that separates the space into an oil reservoir chamber 58 that stores viscous fluid and an operating chamber 59 that accommodates the rotor 56. An inflow adjustment hole 61 is formed in the dividing plate 60 and allows the viscous fluid to flow back from the oil reservoir chamber 58 to the working chamber 59. An inflow adjustment hole 61 is fixed to the oil reservoir chamber 58 side and is pressed to close the inflow adjustment hole 61 by a spring 62. It is composed of a valve 63 and a hot body 64 attached to the outer surface of the case cover 55 and abuts against the valve 63 in response to the cooling water temperature to control the opening and closing of the valve 63, and the joint efficiency of the rotation of the impeller is varied depending on the water temperature. It was controlled by a viscous fluid coupling to reduce horsepower and fuel consumption.

(Problems to be Solved by the Invention) However, in the conventional water pump described above, the power of the engine is transmitted to the impeller via the viscous fluid coupling, so as shown in FIG. Due to the characteristics of the engine, when the engine is running at high speeds when the engine is warm, the rotation of the impeller does not follow the rotation of the pulley and reaches a plateau, causing the risk of overheating because the flow rate necessary for cooling cannot be obtained.

Therefore, the technical problem of the present invention is to prevent the rotation of the impeller from reaching a ceiling during high engine rotation during warm conditions.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
An electromagnetic coupling is used as a transmission means during warm times between the pulley connected to the engine and the shaft to which the impeller is fixed.

(Function) By directly linking the transmission between the pulley and the impeller during warm conditions by operating an electromagnetic coupling, the rotation of the impeller does not reach a plateau even when the engine is running at high speeds, and the flow rate required for engine cooling is maintained. you can get
Furthermore, when the engine is cold, power is transmitted from the pulley to the impeller via the viscous fluid coupling, which improves warm-up characteristics and reduces horsepower loss in medium and high speed ranges.

(Example) Hereinafter, an example according to the present invention will be described based on FIG. 1.

Pump body 1 of water pump 10 shown in FIG.
A shaft 13 is supported within the shaft 1 via a bearing 12, and an impeller 14 is fixedly installed at the right end of the shaft 13 in the drawing. A well-known mechanical seal 16 is disposed between the impeller 14 and the bearing 12 in order to seal a pump chamber 15 in which the impeller 14 pumps water. On the other hand, on the left side of the shaft 13 in the drawing, a first housing 16. A second housing 17 is rotatably supported, and a second housing 20 is attached to the first housing 19.
is fixed via a sealing O-ring 21 so as to form an internal space. A viscous fluid such as silicone oil is sealed in the internal space, and a bearing 17.
A rotor 22 is fixed on the shaft 13 between the rotor 18 and the rotor 22 with its outer edge interposed in the inner space, and a well-known labyrinth groove is formed on the opposing surface of the rotor 22 and the second housing 20.
A torque transmission surface 23 is formed.

Further, the first housing 19 is located at the left end of the body 11 in the figure.
A pulley 25 is press-fitted into the outer diameter of the unit and is rotatably supported via a bearing 24. A cover 28 fitted with a solenoid coil 27 is loosely inserted into the pulley 25, and the cover 28 is welded, etc. The support member 34 is screwed and fixed to the body 11 by means of a support member 34 connected to the support member 34 .

A pulley seat 29 is press-fitted and fixed to the left end of the shaft 13 in the drawing, and a holder 30 having a flange 30a facing the pulley 25 with a gap therebetween is fixed to the pulley seat 29. An armature 31 is interposed in the gap between the flange 30a and the pulley 25, and the armature 31 is riveted to the flange 30a via a spring seat 32 with a plurality of rivets 33 so as to be movable in the axial direction within the gap. It is worn.

Next, the operation of the water pump having the above structure will be explained.

When the cooling water temperature is low, the water temperature switch (not shown) is OFF and the solenoid coil 27 is not energized, so the engine power transmitted to the pulley 25 is press-fitted into the inner peripheral surface of the pulley 25. The torque is transmitted to the first housing 19 and the second housing 20, and is transmitted to the shaft 13 via viscous fluid by the torque transmission surface 23 provided on the opposing surface of the second housing 20 and the rotor 22, causing the impeller 14 to rotate at a low speed. do.

Next, when the cooling water temperature rises and enters a warm state, a water temperature switch (not shown) is turned on (ON) L, and when the solenoid coil 27 is energized, a magnetic circuit is formed by the excitation action of the solenoid coil 27, and the magnetic circuit The armature 31 located therein is attracted to the pulley 25. As a result, the armature 31 is crimped and integrated with the pulley 25,
The power transmitted to the pulley 25 is transmitted to the armature 31, and the power of the armature 3I is transmitted to the spring sea) 3
2. Rivet 33. As explained in detail, the impeller 14 rotates at high speed by being directly connected to the shaft 13 through the holder 30 and the pulley seat 29.
The present invention has characteristics as shown in the characteristic diagram showing the relationship between the flow rate (I) and the water pump rotation speed (rpm) shown in FIG.
9. The power of the pulley 25 is transmitted to the shaft 13 through the viscous fluid coupling consisting of the second housing 20 and the rotor 22, and the impeller 14 is rotated at a low speed to reduce horsepower loss in medium and high speed ranges. The warm-up characteristics of the engine can be improved, and when the cooling water temperature is high, the power of the pulley 25 is transferred to the pulley 258, solenoid coil 27, armature 31. spring seat 3
Since it is directly connected to the shaft 13 and transmitted through an electromagnetic joint consisting of a 2° rivet 33, a holder 30, etc., the flow rate necessary for cooling can be obtained even when the engine is running at high speed.

Further, as shown in FIG. 3, the bearing 24 may be omitted and the load applied to the pulley 25 may be received by the bearings 17 and 18.

〔Effect of the invention〕

In order to solve the technical problem of the present invention, it is possible to use only an electromagnetic coupling and control the pump rotation speed according to the cooling water temperature, but in this case, the electromagnetic coupling is inactive during cold conditions. At the time of , the pump rotation speed is O (rpm), so there is no cooling water flowing in the engine cooling circuit, so the engine is cooled by heat conduction to the stationary cooling water, and the engine side Heat spots appear on the
This may cause distortion in the cylinder head and the like, leading to cooling water leakage.

Therefore, the present invention transmits power from the pulley to the shaft through the viscous fluid coupling to rotate the impeller at low speed when the engine is cold.

In order to reduce horsepower loss in the high-speed range, when the temperature is warm, the shaft is directly connected to the pulley using an electromagnetic coupling to transmit power, and by ensuring the flow rate necessary for cooling at high speed, the above-mentioned heat is reduced. No spots will occur on the engine side.

In addition, in the present invention, in order to transmit power by directly connecting the pulley to the shaft using an electromagnetic coupling during warm conditions,
Even with a small impeller diameter, the flow rate necessary for cooling at high speeds can be secured.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a water pump according to the present invention, and FIG. 2 is a characteristic showing the relationship between flow it (ji') and water pump rotational speed Dpm) in the water pump of the present invention. Fig. 3 is a sectional view showing another embodiment of the present invention, Fig. 4 is a sectional view of a conventional walk pump, and Fig. 5 is a sectional view showing another embodiment of the present invention.
The figure is a characteristic diagram showing the relationship between flow it (1) and water pump rotation speed (rpm) in a conventional water pump. 10...Water pump, 11...Pump body,
12.17.18.24...Bearing, 13...
Shaft, 14...impeller. 15...Pump chamber, 16...Mechanical seal, 1
9... first housing, 20... second housing,
22... Rotor, 23... Torque transmission surface, 25...
・Pulley, 27...Solenoid coil, 30...
Holder, 31... Armature, 32... Spring seat, 33... Rivet Utility model registration applicant 1 Iren H4 ξ 2 Hayashi style blind service Representative Kiyoshi Ito 2 [& Na 5 Fig. ■ (r, p, m)

Claims (1)

[Claims] A pump body, a shaft rotatably supported within the body via a bearing, an impeller fixed to one end of the shaft, and a mechanical seal that seals a pump chamber in which the impeller is housed, In a water pump in which power is transmitted from a pulley via a viscous fluid coupling at the end thereof, an electromagnetic coupling that operates when warm and directly connects the pulley and the shaft is provided as a transmission means between the pulley and the shaft. water pump.