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Positioning of the part on the shaft
Source: China Bearing Network Time: 2013-08-04
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Commonly used axial positioning methods are: shoulder (or collar), sleeve, round nut, retaining ring, conical shaft head number.
.1) Shaft shoulder: The shoulder is composed of the positioning surface and the excessive rounding. To ensure that the end face of the part can be close to the positioning surface; the radius of the shoulder fillet must be smaller than the fillet radius or chamfer height of the part hub hole, to ensure The strength is satisfied to accept the axial force; the shoulder height is h=(2-3)R.
.2) Collar: The function and scale parameters of the collar are the same as those of the shoulder; the width b≥1. 4h. If the collar blank is cast; the material is less and lighter. If it is made of round steel Cheng; then dregs materials and processing hours.
.3) Bushing: The bushing is positioned by means of the part that has been determined by the azimuth; its two end faces are the positioning faces; therefore, there should be a high degree of parallelism and straightness. In order to position the parts on the shaft firmly; The length of the shaft section should be shorter than the length of the part hub by 2~3mm. The use of the sleeve can simplify the layout of the shaft and reduce the stress gathering. However, because the sleeve and the shaft cooperate loosely; the two are difficult to be concentric; therefore, it should not be used on the high speed shaft. Avoid imbalances.
(4) Round nut: When the interval between the two parts on the shaft is large; and the thread is allowed to be cut on the shaft; the end face of the round nut can be pressed to position the end face of the part to locate. The round nut is convenient for assembly and disassembly; Fine thread to enhance the anti-loosening ability and reduce the strength of the shaft to weaken and stress gathering.
(5) Shaft end baffle: When the part is seated at the shaft end; the shaft end baffle and the shoulder, the shaft end baffle and the conical surface can be used to fix the part in both directions. The baffle is fastened to the shaft end by screws and is pressed and positioned. The end face of the part. The method is simple and reliable, easy to assemble and disassemble; but the threaded hole needs to be machined at the shaft end.
(6) Conical surface: It can be used in cooperation with the shaft end baffle and round nut. The taper of the conical surface is small; the required axial force. The gray bump is rough. Generally, the taper is 1:30~1:8.
(7) Elastic retaining ring: cut the annular groove on the shaft; insert the elastic retaining ring into the groove; use its side surface to press the end face of the positioned part. This positioning method is good in craftsmanship and convenient to assemble and disassemble; The strength of the shaft is weakened; it is often used for shafts with small axial forces and high stiffness.
(8) Tapered pin, locking ring, set screw: These three positioning methods are often used for the optical axis.
2. The circumferential positioning of the part on the shaft: the positioning method is always selected according to the size and nature of the transmitted torque, the unevenness of the centering accuracy of the part, and the difficulty of processing. The commonly used circumferential positioning methods are: key, spline, forming , elastic ring, pin, interference and other joints; commonly known as hub joint.
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