Axial parts of the machine is often met in one of the typical parts. It is mainly used to support the transmission parts, transmission torque and loads. Axial parts is revolver parts, its length is larger than the diameter, generally by the YuanZhuMian outside one axis, cone face, in the hole and thread and the corresponding end up. According to the structural shapes of different, axial parts can be divided into the axis, ladder shaft, hollow shaft and crankshaft etc.

The long axis diameter is less than 5 called short axis, more than 20 called a slender shaft, mostly a number line something in between.

Shaft bearings with supporting, and bearing the shaft section called the axis with the neck. Shaft neck is the shaft assembly benchmark, their accuracy and surface quality general requirement is higher, its technical requirements general according to the major function of the shaft and work conditions, establish, often have the following:

(a) the surface roughness

(2) geometric shape accuracy

Axial parts geometry precision is mainly refers to shaft neck, the cone, the hole and cone's roundness, cylindrical degree and so on, should be generally will limit its tolerance in dimension tolerance range. For higher accuracy of inside and outside round surface, should be in drawing mark the allowable deviation.

(3) size accuracy

(4) mutual position precision

Shaft parts position precision requirements are the main shaft in the position of the mechanical function and decision. Usually should guarantee the shaft assembly transmission parts of supporting shaft neck of the coaxial tolerance of requirements, otherwise, it will affect the transmission parts (gear, etc) transmission precision, and noise. Ordinary precision of the shaft, with its axis paragraph of supporting shaft neck of radial beat general for 0.01 ~ 0.03 mm, high precision axis (such as spindle) are generally 0.001 ~ 0.005 mm.

The role of supporting shaft neck in order to determine the position of the shaft, usually the size higher accuracy (IT5 ~ IT7). Assembly train parts shaft neck size accuracy general requirement low (IT6 ~ IT9).

General and drive a match the trunnion surface roughness as Ra2.5 ~ 0.63 u m, combined with bearing of supporting the surface roughness of the Ra0.63 trunnion for ~ 0.16 u m.

 
Axial parts may use requirements, production types, equipment conditions and structure, choose good material, forging and blank form. For the circle diameter of the little difference from shaft, general with good material for the Lord; And for the circle diameter of differ big ladder shaft or important shaft, often choose forgings, such already save materials and reduce the workload of mechanical processing, still can improve mechanical properties.



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