SU1237836A1 - Caseless ball screw mechanism - Google Patents

Description

The invention relates to mechanical engineering and can be used in feed drives of CNC machines and mechanisms equipped with ball screw mechanisms.

The purpose of the invention is to increase the durability due to the precise centering of the nuts relative to the axis of the screw.

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Figure 1 shows the attached ball screw mechanism, a general view; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1.

The device contains a screw 1, nuts 2 and 3, on the ends of which are made grooves 4 and 5 with grooves 6 and 7 on their surfaces, balls 8, smooth half rings 9 and 10 installed between the ends of nuts, half rings 11 and 12 coaxially-20 with their projections 13 in a video spacing (eq. Each half ring is attached to the surfaces of both nuts with four screws 14 1 (two screws per nut).

12378362

The assembly of the unscrewed ball screw mechanism is performed as follows.

Two smooth half-rings 9 and 10 are installed between the ends of the nuts 2 and 3, pre-screwed onto the screw 1. The half-rings are supported by an auxiliary clamp. The nut 3 rotates to complete the set of the gap and 10 alignment of the grooves 6 and 7 on the nuts 2 and 3, the auxiliary collar is removed, and the smooth half rings 9 (And 10 are held between the ends of the nuts by friction forces. Then the grooves 4 and 5 are fixed; Semi-rings 11 and 12, the inner lugs 13 of which fit into the grooves 6 and 7 of both nuts and tighten screws 14 to the surfaces of the grooves of the nuts 2 and 3. The inner surfaces of the semirings 11 and 12 cover the outer surfaces of the grooves 4 and 5 of the nuts 2 and 3 and fastened with screws 14, reliably center the nuts about the axis in int ..

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Editor T. Mitejko

Compiled by R.Ozhin

Tehred L "Oleinik Proofreader V. But ha

Order 3272/38 Circulation 880. Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

CASE-FREE BALL SCREW MECHANISM comprising a screw, two nuts interacting with it, balls located in the grooves of the screw and nuts, and a device for turning and locking nuts, characterized in that, in order to increase the durability of the mechanism, the nuts are made stepwise in length, facing each other to the other, the ends of the smaller steps and each have an axial groove in the lower step, and the device for turning and locking is made in the form of two half rings fixed on the cylindrical surface with protrusions corresponding to the shape of call and placed in the past.