GB/T 35472.2-2017Test method for friction element of wet automatic transmission—Part 2: SZBL type friction test machine guidelines (English PDF)

2.1

with static joints SZBL type friction testing machine.

2.2

The flywheel provides the required kinetic energy.

2.3

Data acquisition frequency is greater than 1000Hz, the measurement accuracy corresponding to the following.

a) Torque measurement accuracy. not more than ± 0.5% of full scale;

b) Pressure measurement accuracy. no more than ± 0.5% of full scale;

c) Speed measurement accuracy. no more than ± 0.1% of full scale;

d) Oil temperature measurement accuracy, less than ± 1% of full scale.

2.4

Heaters and/or coolers are used to control the temperature of the test oil. Includes immersion or bushing heating to control cooling oil temperature

And configure the relevant components that control the external flow of cooling oil. If connected to an immersion heater, the flow can not be changed to ensure the heater

The power density is less than 2W/cm2.

2.5

piston seal can be sealed with fluorine rubber or Teflon ring.

2.6

test machine should be gravity lubrication, centrifugal lubrication and forced lubrication system.

2.7 adapter and washer

The internal spline connection friction plate, the outer spline connection pairs, the pressure plate connected to the piston, with a gasket to adjust the appropriate distance

With the gap. The test oil provides lubrication to the radial direction of the friction element through the oil hole of the internal spline. Pressure plate and gasket flatness does not exceed

0.013mm, the measurement point should be chosen as far as possible in the pressure plate and gasket on the outside.

2.8

Pneumatic system should meet the following requirements.

a) Dry air supply;

b) pressure regulator, adjustable air pressure;

c) gas flow meter should be configured to flow less than 300cm3/min;

d) Regularly inspect the lip seal to ensure that compressed air in the piston cavity will not leak to the test chamber through the lip seal

Oil inspection.

3.1

Piston area of 15000mm2 ~.20000mm2.

3.2

piston effective stroke 4.0mm ~ 5.0mm.

3.3

Piston can load 0.25MPa ~ 1.00MPa pressure, pressure measurement control accuracy of ± 0.5%.

3.4

pressure plate pressure rate of 1.0MPa/s ~ 3.0MPa/s.