Magnetic Clutch Assembly

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Fig 1: Identifying Magnetic Clutch Assembly

Courtesy of VOLVO CARS CORPORATION

Carrier disc
Shim discs
Spring ring
Pulley
Magnet coil.

The compressor is driven by the engine camshaft via the drive belt. As soon as the engine has started, the pulley (4) on the compressor drive shaft operates without hindrance.

Then the climate control system is switched on, the current passes through the magnetic coil (5), which is magnetized. This causes the carrier disc (1) on the compressor drive shaft to be pressed forward towards the pulley.

The coupling is closed and the compressor accelerates with the engine speed.

When the current to the magnetic coil is interrupted, the carrier disc (1) is released from the pulley (4) with the aid of return springs.

When the compressor is disconnected the pulley rotates freely without affecting the compressor. When the solenoid coil is supplied with current the flexible plate is drawn into contact with the pulley. Power is transferred from the pulley via the plate to the compressor shaft.

In order for the magnetic clutch to function correctly, the distance between the carrier disc (1) and the pulley (4) must be exactly correct. Shim discs (2) are therefore placed between them.