Through simulating the on-the-spot application method,the following factors influencing interlayer adhesion of polyurethane woodenware finish coats were investigated: mechanical or non-mechanical roughening between coats,effective hydroxyl of hydroxyl resin,coating interval time between coats,various n(—NCO)∶n(—OH) ratio,change of surrounding temperature and additives,etc.

The method of sending signals during backlash time is suggested based on the jammer s work principle.

This paper studied the precision variation of fine shafting under the low temperature environment in detail from the aspects of material science and assembly clearance, concluded valid method to guarantee the precision of shafting under the low temperature environment.

In view of the current difficulties for measuring and valuating the assembly clearances between car door and car side , the real measurement data of car door and car side have been fitted with the aid of virtual computer assembly technique.

Aiming at laggard and low automatization degree of clearance measure method on axial assembly clearance between half shaft assembly and rear axle housing in automotive rear axle assembly,a new type clearanceometer was developed.