What are the general parameters of ball screws

What are the general parameters of ball screw products

The main parameters of the thread

1) The diameter of the imaginary cylindrical surface where the outer diameter d (major diameter) (D) coincides with the crest of the external thread is also called the nominal diameter

2) The diameter of the imaginary cylindrical surface where the inner diameter (small diameter) d1 (D1) coincides with the bottom of the external thread is used as the calculated diameter of the dangerous section in the strength calculation

3) The diameter of the imaginary cylindrical surface where the pitch diameter d2 in the axial section is equal to the tooth thickness and the interdental width is approximately equal to the average thread diameter d2≈0.5(d+d1)

4) The pitch P is the axial distance between two adjacent teeth on the generatrix of the cylindrical surface of the pitch diameter corresponding to the two points

5) Lead (S) The axial distance between two adjacent teeth on the same spiral line and the corresponding two points on the generatrix of the cylindrical surface of the pitch diameter

6) The number of threads n the number of spiral threads, generally for the convenience of manufacturing n≤4 the relationship between the pitch, lead, and the number of threads: Su003dnP

7) The angle between the tangent of the helix on the cylindrical surface of the pitch and the plane perpendicular to the axis of the helix.

8) Thread angle α The included angle between the two sides of the thread profile in the axial plane of the thread 9) Thread oblique angle The included angle between the side of the thread profile and the vertical plane of the thread axis. Symmetrical tooth profile (Guide: The selection of fasteners is principled)

The main geometric dimensions of various threads (except rectangular threads) can be found in the relevant standards. The nominal size is that the outer diameter of the thread is approximately equal to the inner diameter of the pipe thread.

The self-locking condition of the screw pair is: the thread lift angle is less than or equal to the equivalent friction angle of the screw pair.

The transmission efficiency of the screw pair is: the ratio of the effective work to the input work when the nut rotates one circle.

Circumferential force required to overcome the axial force Q uniformly rising

More related stamping product industry news: