SU1677385A1 - Flexible shaft - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to structures of flexible shafts, and can be used to transfer rotation from one non-axial shaft to another. The purpose of the invention is to improve the performance characteristics by improving the smoothness of the work. Between the end parts 1 and 2 of the flexible shaft there are cylindrical elements (E) 4 consisting of the covering and covered parts, enclosed in the shell 7. The peripheral surfaces of the covering and covered parts are provided with evenly spaced right and left-way grooves (K) 5, in which power E 6 are placed in the form of a cable connected to parts 1 and 2. The K 5 with the same name have a depth exceeding the depth of others by thickness E 6. The ends of the male part are spherical. Э 4 are equipped with central holes, inside of which is located a tensioning E 4 cable. The angles of inclination K 5 are determined from the equation given in the description. The shaft is filled with a lubricating compound. E 4 can be made of plastic. 3 hp f-ly, 3 ill.

Description

The invention relates to mechanical engineering, in particular to structures of flexible shafts, and can be used to transfer rotation from one non-axial shaft to another.

The purpose of the invention is to improve performance by improving the smoothness of work.

FIG. 1 shows a flexible shaft, a general view; in fig. 2 — node I in FIG. 1, longitudinal section; in fig. 3 is a section A-A in FIG. one.

The flexible shaft consists of end parts 1 and 2 connected by a tensioning cable 3, on which composite cylindrical elements 4 with uniformly spaced circumferential grooves 5 are placed. In the grooves 5 flexible power elements 6 are placed in the form of a cable. The flexible part of the shaft is enclosed in a shell 7. A reducing and lubricating composition is placed inside the shaft 8 in the cavity 8, for example copper glycerate. The cylindrical elements 4 are comprised of female 9 and male 10 parts, which can be metallic or non-metallic, for example plastic, ceramic, etc. The ends of the male parts 10 are convex and spherical. The grooves 5 are left-handed and right-handed, while on each of the peripheral surfaces covering 9 and covered 10 parts of the same-name grooves, for example, right-handed, are made greater than others, for example right-handed, by the thickness of the power element 6.

In order to increase the load capacity, the slope angles of the grooves are taken as determined from the equation

K3 + 6 K2 - (4 t2 - 9) K - 8 t2 0 at t g / A;

is smiling

h | VJ CO 00

ate

- ,, “2

l

K tg a; 0 and where r is the distance

from the shaft axis to the axis of the corresponding power element;

A is the distance between adjacent female parts,

Flexible shaft works as follows.

The torque from the drive, to which one end of the shaft is connected, for example part 1, is transmitted through the flexible part of the shaft to the actuator, to which the end part 2 is connected. Between the end parts 1 and 2 of the shaft, the torque is transmitted through the power elements 6 working on stretching. Cylindrical elements prevent the force elements from twisting b. The cable 3 serves to hold the cylindrical elements A in the assembled state. The performance of the force elements 6 is flexible and their arrangement in the helical grooves provides damping, which increases the smoothness during the transmission of the torque. The reducing lubricating composition, placed in the internal free space 8, performs the functions of an acoustic frequency oscillation damper, generated, for example, by a motor, and lubricant for the shaft elements. By contacting between themselves the cylindrical elements A with spherical ends, it is possible for the shaft to transfer axial loads under conditions of shaft bending.

The shaft is characterized by smoothness of work, reliability, noiselessness.

Claims (4)

Claim 1. A flexible shaft consisting of end parts connected by a flexible part enclosed in an elastic sheath, the flexible part is made in the form of successive cylindrical elements,  . / / 7 J five 0 five provided with supporting end surfaces and central apertures, inside which a cable is attached, cylindrical elements, characterized in that, in order to improve performance by improving smoothness of operation, the flexible part is equipped with power elements in the form of a cable connected to the shaft end parts, cylindrical elements are made of female and male parts, on the peripheral surfaces of which the right and left side grooves, in which power elements are placed, while on each of the peripheral surfaces the like grooves are made with a depth greater than the others by the thickness of the power element, and the supporting surfaces are located on the covered parts of the cylindrical elements and are spherical. 2. The shaft according to claim 1, characterized in that, in order to increase the load capacity, the slope angles of the grooves are taken to be determined from the equation К3 + 6 К2 - (4 mz - 9) -К - 8 т2 0 at t  g / a; K tg2 a 0 a TЈ where r is the distance from the shaft axis to the axis of the corresponding power element; A is the distance between adjacent female parts. 3. The shaft according to claim 1, characterized in that a replenishing composition is disposed inside the shaft. 4. Shaft pop. 1, characterized in that the cylindrical elements are made of plastic. G 6 Financial instrument Щи22 Wue.j