The machine shaft is often encountered in one of the typical parts. It is mainly used to support transmission parts, transmission torque and load bearing. Shaft is rotating body parts, this greater than the diameter of the cylindrical shaft generally concentric cylinder, cone, bore and thread and the corresponding end of the composition. 

 

 Axis as short axis aspect ratio of less than 5, more than 20 known as the slender shaft, most of the shaft in between.

Shaft bearing support, and bearing with the shaft section called journal. Journal is the axis of the assembly base, their accuracy and surface quality is generally higher, and its technical requirements are generally the main function of the shaft and working conditions to develop, usually the following:

(A) the dimensional accuracy

From the supporting role of the journal in order to determine the location of the axis, its dimensional accuracy is usually higher (IT5 ~ IT7). Transmission parts assembly dimensional accuracy is generally less demanding journal (IT6 ~ IT9).

(B) The accuracy of geometric shapes

Precision shaft parts mainly refers to the geometric shape of the journal, outside the cone, such as Morse taper hole roundness, cylindricity, are generally limited in size tolerances should be within the tolerances. Of high precision cylindrical surfaces, should be marked on the drawings the allowable deviation.

(C) The accuracy of each position

Shaft location accuracy is mainly in the mechanical axis of the position and function of the decision. Should normally ensure that the assembly of the transmission parts of the journal bearing journal concentricity requirements, otherwise it will affect the transmission components (gears, etc.) driving accuracy, and noise. General accuracy of the shaft, the shaft section of the bearing journal with run out is generally 0.01 ~ 0.03mm, precision axis (such as the spindle) is usually 0.001 ~ 0.005mm.

(D) Surface roughness

generally compatible with the transmission parts of the shaft surface roughness Ra2.5 ~ 0.63μm, matching the support shaft and bearing surface roughness Ra0.63 ~ 0.16μm.



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