SU1372432A2 - Rotatable electric connector - Google Patents

Abstract

This invention relates to the field of radio engineering. The purpose of the invention is to improve the reliability of the multi-channel electrical connector, containing loop-shaped flexible elements with conductors placed in them, connected by their ends with swivel and fixed bases arranged concentric with each other. The elimination of corrugations by flexible elements is achieved by using lining 23 mounted on flexible elements and a rotary base, with the possibility of lining mounted on flexible elements in the spaces between the lining mounted on the convex cylindrical surface of the rotary base 1. Electric signals from the fixed base 2 are transmitted to pivot base 1 through the wire. The pads 23 fit into the grooves between the limiting plates 8 which are adjacent along the length of the flexible element and which are attached to the flexible element on the outside of the main elastic band. 7 il. from 13 (L

Description

four

WITH

to

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FIG. 6

The invention relates to electrical engineering in the field of creating rotary electrical connectors and is an improvement of the connector according to the main author. St. No. 1336145.

The purpose of the invention is to increase the reliability of operation by reducing the formation of a flexible element in the process of its movement of the corrugations.

Figure 1 shows a rotary electrical connector, top view; figure 2 - section aa in figure 1; fig.Z - node I in figure 1; figure 4 - section bb in fig.Z; in FIG. 3, view B in FIG. 3; figure 6 - node II in figure 1; Fig. 7 is a schematic of the device geometry during its operation.

The rotary electrical connector contains a rotary 1 and a fixed 2 concentric to each other base (figure 1). Between the bases 1 and 2 there is a loop-shaped flexible element in the form of a main elastic band 3, additional elastic tapes 4 and the posts 5 associated with them of flexible plates 6 (FIG. 3). Between the plates 6 and the strips 3 and 4, wires 7 are connected, connected by ends to bases 1 and 2. The main elastic tape 3 is fixed by ends also on bases 1 and 2. It is secured with its first ends by means of restrictive plates 8 of rack 5, which located both along the tape 3 and against each other along the width of the tape. Additional tapes 4, which increase the carrying capacity of the main tape 3 while maintaining its flexibility, are located along the surface of the main tape 3 and are fixed on one of the bases 1 or 2 with their ends alone, and the other ends are laid on the main tape 3 in the form of a package freely fixed in thickness using racks 5 with spacer sleeves 9, for which the package has longitudinal holes 10 for spacer sleeves 9 (figure 4). At the second ends of the respective racks 5, located opposite each other, are reinforced with the help of spacer sleeves 9 and restrictive plates 8, the first edges of the flexible plates 6. The second edge of each plate 6 is movably connected (slides) to the second ends of the racks 5 adjacent to the length of the tape plate edge 6, inlet (as shown

in FIG. 3 by a dotted line) into the gap along the width of the tape between these adjacent posts 5, the second edge of the plate overlaps the first edge of the next plate with the possibility of longitudinal movement of the plates relative to each other, tapes 3 and 4 and wires 7 when the connector turns. For

0 ensuring such free movement of the edges of the flexible plates 6 relative to each other and limiting the second edges of the flexible plates from moving in the direction of the height of the uprights 5 (or

5 in the direction of the bending radii of the flexible element) in the second edges of the flexible plates there are made longitudinal holes 11, in which, as r, the guides include spacer washers G2, mounted on the second ends of the uprights 3. Elements 8,3,4,9,6 , 11 and 8 form a bag, with the spacer sleeve 9, mounted on a stand 5, resting against the main elastic band 3 and the flexible plate 6.

Swivel 1 and fixed 2 bases are made in the form of cylindrical shells 13 and 14, respectively (figure 2) with flanging 13 and 16. To flanging

0

13 with screws 17 fastens the inner race 18 of the bulk bearing containing balls 19. The outer race 20 of this bearing is attached with similar screws to the flange 16 of the shell 14. With the ends of the wires 7 fixed on the swivel 1 and fixed 2 bases, the connectors are connected 21 and 22, respectively (FIG. 1).

On the convex surface of the swivel base 1, lining 23 is additionally installed with a pitch of their installation, allowing the lining 23 to enter the grooves between the limiting plates 8 adjacent along the length of the flexible element and attached to the flexible element on the outside of the main elastic band 3 (Fig. 6).

The connector works as follows.

The electrical signals from the fixed base 2 are transmitted to the rotary section 1 via the wires 7.

The rotation of the rotary base 1 is carried out from a drive (not shown). When the rotary base is rotated clockwise, the main elastic band 3 is buckled, which is unwound from the rotary base 1 (Fig. 7). At the same time, the pads 23 mounted on the convex surface of this base 1 fit into the grooves between the restricting plates 8 adjacent along the length of the flexible element and fixed to the flexible element on the outside of the main elastic band 3.

Denote by Tj, the tangential force applied to the flexible element from the rotary base 1, T - the tangential force applied to the specified restrictive plates 8 from the side of the lining 23. The flexible element is in the area between its fixing point and the places of mutual contact of the plates 8 and lining 23 is curved in an arc of a circle whose radius is equal to the radius of the shell 13, since

T, p. T; cond-s: | y,

where L is the length of the arc covered by the flexible element;

R is the radius of the convex surface of the swivel base;

n is the number of plates 8 being

in contact with the pads 23 (Fig.7).

Thus, the tangential force applied to the flexible element is decomposed by the sum of the tangential forces applied to the sum of the plates 8 and the linings 23. The distance along the arc along which the flexible element is bent, being wound on a cylindrical surface, is proportional to the bending

bones of a flexible element: the higher the flexibility, the longer it can be wound.

Thus, the observed dynamics of the device can be traced to the following regularity: the total force of friction between the plates 8 and the plates 23 (and, consequently, the resistance to buckling of the flexible element) increases as the degree of flexibility of the flexible element increases. This pattern manifests itself during the operation of the device as follows. When the rotary base 1 rotates in the direction of the arrow in FIGS. 6 and 7, the point of the surface of the flexible element is moved by an angle about in the direction of this arrow and the flexing of the flexible element first

. , 0

h 0

five

0

5 d

five

Location on . If the friction force between the plate 8 and the patch 23 on the surface at point S is insufficient to balance the elastic force of the flexible element section S, S, then the next section of the flexible element 8.34 will bulge. If the friction force between plate 8 and 23 at points Sj and S is insufficient to balance the elastic force of sections SjS, and., Then the next section of flexible element will bulge -.

Since the radius of the bulged section (consisting of the sum of the sections S, jS ,, and) is larger than the radius of the convex cylindrical surface of the rotary base 1 by the value ii (Fig. 7), when the plate 23, mounted on the rotary base 1, moves by an angle, the plate 8, fixed on the elastic element and in contact with the plate 23 on the surface S ;, is moved by an angle,

with T

smaller angle of magnitude O.y.g.

TO

Thus, when the flexible element buckles, the plates 23 advance the plates 8 by an amount, and according to Hooke's law, this advance corresponds to additional tangential forces T; and additional friction & p forces that prevent further flexing of the flexible element.

When mutual contacting of the plates 8 and lining 23 force T; between them is directed tangentially to the arc L, and the friction force P; between plates and plates is directed along the radius R.

Friction effort

, Cos

2R (n-1) where is the coefficient of friction.

Total friction effort

45

 P 1C,

Thats

L

five

 ° 2R (n-T) From the last expression, it follows that with a decrease in the number of overlays, while simultaneously increasing the angle between them (or the distance along the arc between them), the friction force increases.

Thus, by increasing the number of overlays, it is possible to achieve that the friction force directed along the rotation of the swivel base 1 will balance the flexing force of the flexible element leading to the formation of corrugations during its movement. Therefore, in the device, the formation of corrugations on the flexible element will occur only within the areas bounded by the gaps between the plates, which practically does not affect the reliability of the device. The formation of corrugations, even if insignificant, leads to shortening of the branch of the flexible element adjacent to the rotary base, and therefore leads to linear displacements of the flexible element relative to the fixed base during operation of the device. However, these linear movements will not adversely affect his work, since the cylindrical surface of the fixed base 2 is concave, in contact with the restrictive plates 8 mounted on the flexible element, is made smooth, and therefore there will be a slight slip of the plates 8 of the flexible element along this smooth cylindrical surface that does not affect the reliability of the device. When the rotary base 1 is rotated counterclockwise, the main elastic is wound

I

ten

15

20 724326

on the swivel base, the pulling of the elastic band in the areas between the plates is replaced by their tension. In this case, the danger of the formation of corrugations is absent.

During operation of the device, the longitudinal movement of the flexible plates 6 relative to each other and the wires 7 (the latter relative to the strips 3 and 4) occurs, as well as the angular movement of the spacer sleeves 9 and the uprights 5 inside the longitudinal holes 10. The spacers linearly move.

washers 12 relative to the longitudinal holes 1 1.

Claims (1)

Invention Formula Rotary electrical connector auth. St. No. 1336145, characterized in that, in order to increase reliability by reducing the formation of a flexible element during its movement of the corrugations, lining with a pitch of their installation is installed on the convex surface of the rotary base, allowing the lining to fit into the grooves between adjacent along the length of the flexible element the previously mentioned restrictive plates fixed on the flexible element on the outside of the main elastic band. -BUT f5 f / e jy, 76 r / J / r7ff / 4 12 K 5 FIG. J FIG. and CPU2.215 Type B 15 . five FIG. 7