The electro hydraulic servo type four ball friction tester is mainly used to evaluate the load carrying capacity of lubricants in the form of sliding friction at very high point contact pressure. It includes three indicators: maximum non bite load PB, sintering load PD and comprehensive wear value ZMZ. The four ball friction tester can also conduct long time wear resistance test of lubricants, measure friction coefficient, record frictional force and temperature curve. Electro hydraulic servo four ball friction tester can be equipped with high precision measuring device, which can realize the screen calculation, measurement and recording of friction pairs. Special accessories can also be used for the simulation of end face friction and material, and the appearance of reference pictures is shown in the above figure.

GB/T12583-98, determination of lubricant extreme pressure properties (four ball machine method);

GB3142-82, lubricant loading capacity determination (four ball method);

SH/T0189-92, lubricating oil antiwear performance test method (four ball machine method);

SH/T0202-92, lubricating grease extreme pressure test method (four ball machine method);

SH/T0204-92, lubricating grease antiwear performance test method (four ball machine method).

Two. The main technical parameters:

Serial number	entry name	Technical indicators
1	Test force
1.1	Working range of axial test force	60～10000N
1.2	Relative error of test force indication	±1％
1.3	Automatically keep the indication error when the test force is long	±1％F.S
2	friction torque
2.1	Measurement range of friction torque	0～13500N.mm
2.2	Relative error of moment of friction	±3％
3	Spindle speed
3.1	Variable frequency range of spindle	200～2000r/min
3.2	Spindle speed error	±10r/min
4	Oil box travel	＞45mm
5	Taper of spindle bore	1：7
6	Test machine heating system
6.1	Heater operating temperature range	room temperature ～250℃
6.2	Temperature control precision	≤2℃
7	Spindle control of test machine
7.1	Time display and control range of test machine	1～99999s or 1-99999min
7.2	Rotation number display and control range of test machine	999999999
7.3	The maximum output torque of the main motor of a test machine	2.3N.m
8	The amount of oil used for one test	about10ml
9	Special standard steel ball diameter	Ф12.7
10	The size of the test machine (long x width * high mm)	about 1160×750×1640
11	Net weight of test machine	about 400kg
12	Rated power of test machine	5.5KW

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The contact：Janna Tang

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