The centrifugal oil filter (fig. 1.) is bolted to the front cover of the crankcase on the right through a gasket so that the inlet A and outlet B to C are aligned with the corresponding channels in the cover

Rotor 4 rotates on axis 12, closed by cap 3, which is attracted to the rotor housing with nut 6.

In order not to disturb the balance of the rotor during assembly, it is necessary to align the marks on the rotor body and the outer side of the cap.

Kamaz centrifugal oil filter

Together with the rotor, the oil in it also rotates.

Suspended mechanical impurities under the action of centrifugal forces are thrown away from the axis of rotation and deposited in a dense layer on the inner walls of the rotor.

The way the rotor is driven by the nature of its rotating forces is active-reactive.

The rotation of the rotor is reported as follows.

The oil pumped by the radiator section of the oil pump into the annular channel of the axle 12 passes through the channels Г.

Emerging at high speed from these channels directed tangentially to the circle, the oil flow acquires a rotational motion and, acting on the inner surface of the rotor, drags it into rotation.

This principle of transferring energy to the flow of the rotor is called active. Torque Ma is active torque.

The oil deflector 13 deflects the oil flow down and prevents deposits in the rotor from being washed away, especially at the moment of its acceleration, by a jet of oil exiting the G channels at a speed of more than 25 m/s.

After passing under the screen, the oil moves upwards, undergoing centrifugal cleaning along the way, and then is injected into channels D (also located tangentially to the circle), from which it is ejected at high speed into the inner annular channel of the rotor column.

The direction of this flow is opposite to the movement of oil in the channels G, therefore, the reactive forces arising here create a reactive moment Mp, which coincides in direction with the active one.

These moments, adding up, give the total torque Mk, under the influence of which the rotor rotates at a frequency of about 5000 rpm.

Kamaz centrifuge

The speed of the rotor, and therefore the intensity of cleaning, depend on the pressure and temperature of the oil, as well as on the friction in the bearings.

Reducing friction is achieved by the fact that the rotor shifts upward during operation and rotates against the bearing 10.

Rotor lift is limited by thrust washer 9 within the gap.

Next, the oil enters the inner channel of the axis 12 of the rotor and through the tube 1 into the channel of the centrifuge body, from where it is fed into the radiator with the tap open or, bypassing it, through the drain valve into the sump if the tap is closed.

In addition to the drain valve, a bypass valve 16 is placed in the filter housing. Both valves are regulated by the selection of shims.

You should know the main differences in the operation of an active-reactive centrifuge from a reactive centrifuge.

If the rotor rotates in jet oil, draining from it through the nozzles, then there are no nozzles in the active-jet centrifuge, so the oil is not saturated with air and oxidizes less.

It is impossible to determine the performance of an active-reactive centrifuge by the characteristic noise that is heard in reactive centrifuges for 1.5 ... 2 minutes after the engine is stopped, since the rotor of the active-reactive centrifuge does not rotate at this moment.

Its performance is determined by the amount of deposits on the walls of the rotor cap.

During the operation between TO-2, about 200 g of deposits should accumulate in the cap, their thickness is approximately 10 mm.

To wash the centrifugal filter rotor:

  • — unscrew the nut of the filter cap and remove the cap;
  • — turn the rotor around the axis so that the locking pins enter the rotor hole;
  • - unscrew the nut securing the rotor cap, remove it;
  • - check the tightening of the rotor fastening nut on the axle, if necessary, tighten it with a torque of 78.5 ... 88.3 Nm (8 ... 9 kgf.m). Do not remove the rotor for maintenance;
  • - remove sediment from the caps and wash them with diesel fuel;
  • - assemble the filter by matching the marks on the cap and the rotor.

Before installing the outer cap, depress the pins of the locking device and check the rotation of the rotor on the axis, the rotor should rotate easily, without jamming. Tighten the cap nuts with a torque of 19.6 ... 29.4 N.m (2 ... 3 kgf.m).