CN2106939U

CN2106939U - Reversal rolling screw pair

Info

Publication number: CN2106939U
Application number: CN 91220150
Authority: CN
Inventors: 邓隽钧; 孟晧; 储霞佩; 冉玉华; 王磊; 朱振宇
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-05
Filing date: 1991-08-05
Publication date: 1992-06-10

Abstract

Disclosed is a reversal rolling screw pair, belonging to a mechanical transmission device. The utility model comprises a leading screw and a screw nut pair, wherein, the two ends of the leading screw are provided with reversal sleeves, and each sleeve is provided with small grooves which are corresponding to the number of screw grooves; the screw nut pair comprises two screw nut rings, and each ring is provided with a strip of rolling tracks which are correspondingly and equally divided by a cage according to the number of the screw grooves. The utility model which has the advantages of small wear in motion, stable and reliable action at the time of direction changed, etc. can be used in an electric wire industry, an electric cable industry, a printing industry, etc.

Description

Reversal rolling screw pair

The reversing rolling screw pair is a kind of reversing arrangement on rolling screw, belongs to the mechanical transmission class.

The reciprocating mechanism of existing realization, the general screw pair product that adopts sliding friction, though there is simple structure in this class mechanism, the characteristics that cost of production is low, because the motion mode of machinery---sliding friction institute is extremely, so there is friction factor big, the energy consumption height, shortcoming such as part is fragile, the rolling screw by-product has less abrasion and higher work efficiency, but because stability is unresolved when reciprocating, so also do not adopt rolling screw to pay the changement of product at present.

Task of the present utility model is exactly to solve the application of mechanical to-and-fro motion in rolling screw.

The reversing rolling screw pair is paid by leading screw and nut and is formed.Returning sleeve is equipped with at the leading screw two ends, has on the working surface of its cover and thread groove number sulculus one to one.The nut ring that it is L that nut is paid two centre distance has one to be the stable operation that guarantees that nut is paid by one of the annular arc raceway of retainer corresponding five equilibrium by the thread groove number in the ring, require L ≠ KP, and K is a natural integer, and P is a lead of screw.

The reversing rolling screw pair adopts the time-delay of returning sleeve to step down and the cooperation of spring augmented thrust, makes to-and-fro motion be able to reliable application on rolling screw is paid.The rolling friction campaign has less wearing and tearing, therefore, though the reversing rolling screw pair is more complicated than the slip screw commutation aspect production technology, but the energy consumption than sliding friction low 50% is arranged, with two times the advantage of prolonging working life of part, so its comprehensive benefit is more much higher than adopting slip screw to pay product.

Fig. 1 is for having the left and right structural drawing that revolves the reversing rolling screw pair of each three thread groove on the leading screw.

Fig. 2 is the A-A sectional drawing.

Now the enforcement of reversing rolling screw pair is explained as follows in conjunction with Fig. 1:

Returning sleeve (6) is housed respectively on the relevant position at leading screw (1) two ends, the external diameter of its cover (6) equates with leading screw, and with the corresponding end face of leading screw (1) working portion on join at the bottom of also having three bottom lands and thread groove, groove width is the sulculus of ball size, in addition, spring case (2) is housed also on the two ends of leading screw (1), its box is by standing part, movable part, 2 first pins of spring and symmetrical distribution are formed.The movable part of unit pin and box is for fixedlying connected, with the standing part of box for being slidingly connected.Spring case pays the thrust-bearing (5) on (4) outer side compression in when work with nut, and assurance is when commutating, and the movable part and the standing part of spring case close up.

Nut is paid (4) and is made up of 2 nut rings (9), spacer (7) and 2 thrust-bearings (5).Two nut rings (9) separate with spacer (7), two ring centre distance=P+, 1/4 P(P is a lead of screw, P is a thread pitch), nut ring (9) has in the ring-type raceway (see figure 2) puts three balls (10), divide equally and supporting by retainer (8) with corresponding ball screw three-flute, retention nut centering, 2 thrust-bearings (5) are by the next-door neighbour outside that is placed on two nut rings (9).

The explanation of commutation process: establish leading screw (1) and rotate by direction shown in Figure 1:

When nut is paid (4) when not walking to terminal, three balls (10) in the two nut rings (9) have the moving along the left hand thread trough roller on the leading screw (1) of several angle difference mutually, and nut is paid (4) direction moving linearly left.

When nut is paid (4) when walking to the left terminal of leading screw (1), nut is paid the movable part of pressure bearing (5) the left side pushing spring case (2) on (4), and make it to close up with standing part, nut ring (9) is drawn close and is contacted with returning sleeve (6), at this moment, three balls in the two nut rings are on the same center line with parallel axes, and ball falls in the sulculus of returning sleeve (6) in the promptly left nut ring, and the ball of right nut ring is in the point of interface of left and right screw thread.When leading screw continued rotation, the elastic force of spring (3) was forced the ball in the right nut ring (9) in the right-hand thread groove, and simultaneously, the ball (10) that drops in returning sleeve (6) sulculus skids off sulculus naturally, rolled synchronously to the right in the thread groove, finishing commutation and moving.

Claims

1, reversing rolling screw pair is paid by ball-screw and nut and to be formed, and it is characterized in that: returning sleeve is equipped with at the leading screw two ends, has on the working surface of its cover and thread groove number sulculus one to one; Nut is paid by two nut rings and is constituted, its ring in have one by retainer by the thread groove number raceway of corresponding five equilibrium, two the ring centre distance L ≠ KP (K is a natural integer, and P is a lead of screw).