CS213635B1 - Automatic cooling fan coupling with permanent magnet - Google Patents

Abstract

The proposed automatic cooling fan clutch transmits torque by closing the magnetic flux between the permanent magnet of the freely mounted fan and the ferromagnetic disc of the driven part of the clutch. By reducing the air gap between the axially sliding ferromagnetic disc and the permanent magnet, the fan drag increases quadratically, thereby changing the amount of air flowing over the engine radiator depending on its temperature. The movement of the ferromagnetic disc is ensured by a thermostat and a push-off spring.

Description

213 aas

It is an object of the invention to provide an automatic fan clutch with permanent magneto-especially suitable for vehicle combustion engines which, by varying the speed of the fan, closes, depending on the temperature, the amount of air required by the cooler.

So far known automatic clutch fan couplings are designed mainly on the principles of friction utilization, electromagnetism, hydraulics and the like. Their main drawback! the unregulated method of regulating the temperature when the coolant temperature fluctuates over a wide range of temperatures, insufficient power or the need to oversize the fan for extreme temperature modes and hence higher energy consumption, the need for energy to control and transfer power. The couplings are relatively complicated, difficult, consuming to consume deficient metals and alloyed steels, or do not meet the complete transmission requirements and the associated fan speed control.

The aforementioned drawbacks are eliminated by a magnetic coupling with a permanent magneto-element of the invention, the principle of which is that the ferromagnetic disk driven by the drive coupling is axially approached or separated depending on the change in temperature of the air flow, depending on the temperature change of the air flow. By reducing the air gap, the transmission torque and thus the fan speed are increased quadratically, while the air gap is reduced by the transfer torque and thus the fan speed and the air flow rate through the cooler.

The higher effect of the proposed solution over prior art solutions is that the coupling does not need any power supply for switching and torque transmission. The dramatic reduction in slip between the drive and driven clutch timers at temperature rise allows the refrigerant temperature to be maintained at a high precision even under extremely varying temperature conditions, which are not even viscous, or other slip clutches. The solution is simple and it can therefore be assumed that its long-term reliance on the low-end puffing, the use of lightweight construction materials available, the plastic compound, and the more economical production and operation than the other known solutions, can be assumed.

1 is an illustration of an embodiment of an automatic fan-clutch coupling with a tubular thermostat in FIG.

Coupling time P3 is rigidly coupled to the motor drive, carries loose, rotatable fan coupling P 2 in which the permanent pin J of the pin is encapsulated and traverses the flange of the driven coupling part 1 and is rigidly coupled to the ferromagnetic a plate 6 is screwed onto the pegs 6. A compression spring is inserted between the drive part and the plate 6. A thermostat 8 is screwed to the flange of the clutch drive part. The permissible magnet is made of even number of magnets J with pole pieces The transfer of heat from the flowing air to the rotating thermostat causes its filling to increase in volume and the thermostat 8 to push the plate 6, which pushes the ferromagnetic wheel 4 to the permanent magnet by means of a pin% By decreasing the gap between the ferromagnetic disc 4a by the permanent magnet 2, the entrainment of the force is progressively increased, the speed of the driven part 2 of the clutch increases, the slip of the speed relative to the speed of the drive part 1 of the clutch or motor is reduced -Yippee. The air flow through the cooler is increased, thereby cooling the refrigerant in the cooler. When the temperature is lowered, the volume of the thermostat 8 is reduced, the pressure force on the plate is reduced

Claims (2)

Automatic clutch fan of permanent magnet cooling, characterized in that the flange of the clutch drive part (1) is provided with at least three holes for the pins (5) of the ferromagnetic disc (4), on which the plate (6) with a recess for the spring (7) a driving part (2) of a permanent magnet coupling (3). The automatic clutch according to claim 1, characterized in that the permanent magnet (3) is composed of an even number of individual magnets with pole pieces (9) mounted in a circular groove of the clutch drive part (2), the adjacent pole pieces (9) having common poles.