1. Scratch damage phenomenon: a work surface rotation direction found along the digital root deep scratches, damage mechanism of hard particle is big different grain machinery to characterize the alloy surface, reason is: in bearing lubrication in hard into the gap between different grain, mainly by lubricating oil into, or for assembling work not beautiful and clean airproof.

2. Scratches damage phenomenon: working surface of local area become hair, along the direction of rotation to draw a piece of fine glass, have a clear end boundaries: damage mechanism: sliding surface bumpy or small hard foreign bodies in the local area along the direction of sliding surface stroke wipe work, this area is usually the most thin oil film place; The main reason is the oil filtration not beautiful.

3. Particle attrition damage phenomenon: a work surface area along the main bearing on large area of subtle direction of rotation scratching, SKF bearing clearance increase, damaged area on the surface polishing sometimes bright; Damage mechanism of: oil contains tiny impurities, like grits slowly like worn surface; The reasons of the poor quality is mainly filter, allowing foreign bodies through particle degree is too large or oil polluted.

4. Erosion wear damage phenomenon: in the oil hole groove, edges of scour grinding mark; Damage mechanism: the flow of oil contains grits, erosion alloy surface of injury; Reason is oil filtration poor quality, flow design is reasonable, the lubrication high flow velocities.

5. Mixed friction and wear damage phenomenon: INA bearing a work surface is smooth on local area grinding mark, bearing clearance increase; Damage mechanism: the area of oil film thinning, long-term in mixed friction state, cause this place generation investment with sexual wear; Reason: (1) the oil film bearing capacity is not enough, so thin film thickness; (2) the diesel engine long time overload; (3) often diesel engine start, stop.

6. Partial ground damage phenomenon: bush edges on both sides wear a mark; Damage mechanism: local area clearance decrescent, concentrated load, the mixture of local produce friction or particle attrition; Reason: (1) shaft neck cylindricity not request, in busbar concave, load bearing focused on the edge area; (2) hole in bearing bus concave, most occurred in furcated connecting rod thick wall in the bush.

7. Partial ground damage phenomenon: bush edges side grinding mark; Reason: (1) a drum shaft neck bus outstanding; (2) the bearing hole edge rigidity is insufficient, load mainly by the central bear bearing.

8. Partial ground damage phenomenon: bush edges side grinding mark; Reason: (1) shaft neck, housing inclination deformation produced or processing error; (2) the shaft neck with taper.

9. Partial ground damage phenomenon: bush diagonal wear; Reason is shaft neck relative bearing hole tilt.
10. Partial ground damage phenomenon: the up and down with the present near the plane, a corresponding wear area; Reason is bearing cover assembly transverse displacement after.



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