Patent ID: 11921090
Assignee: GUANGXI LIUGONG MACHINERY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A whole-vehicle-based method for evaluating extreme pressure and antiwear properties of grease, comprising:
selecting an engineering machine and a key bearing pin of the engineering machine;
injecting the grease onto the key bearing pin and commissioning the key bearing pin;
causing the engineering machine to operate effectively under no load and under a load of 10n % to (10n±2)% rated load separately;
viewing and analyzing a wear condition of the key bearing pin; and
issuing an evaluation report of the extreme pressure and antiwear properties of the grease,
wherein n denotes an integer of 1 to 15, and the engineering machine is caused to operate once under a load of 10n % to (10n±2)% the rated load for 0.5 min to 100 h,
wherein the method further comprises:
recording whether abnormal noise occurs during effective operation of the engineering machine under different loads, and recording a noise peak of the engineering machine during the effective operation under the different loads,
wherein a noise peak generated under a corresponding load is determined according to a formula:, Max
   ⁡
   (
   
    
     
      
       dB
       1
      
      +
      
       dB
       2
      
      +
      
       dB
       3
      
      +
      
       dB
       4
      
      +
      
       dB
       5
      
     
     5
    
    ,
    
     
      
       dB
       x
      
      +
      
       dB
       
        x
        -
        1
       
      
      +
      
       dB
       
        x
        -
        2
       
      
      +
      
       dB
       
        x
        -
        3
       
      
      +
      
       dB
       
        x
        -
        4
       
      
     
     5
    
   
   )
  
  ,
 

wherein, dB
    1
   
   +
   
    dB
    2
   
   +
   
    dB
    3
   
   +
   
    dB
    4
   
   +
   
    dB
    5
   
  
  5, denotes an average value of noise peaks of the key bearing pin during first five times of lowering in N times of lifting of a working device of the engineering machine, and, dB
    x
   
   +
   
    dB
    
     x
     -
     1
    
   
   +
   
    dB
    
     x
     -
     2
    
   
   +
   
    dB
    
     x
     -
     3
    
   
   +
   
    dB
    
     x
     -
     4
    
   
  
  5, denotes an average value of noise peaks of the key bearing pin during last five times of lowering in the N times of lifting of the working device of the engineering machine.