RU1794208C - Hollow flexible shaft - Google Patents

Abstract

Usage: mechanical engineering, shaft structures of machines and mechanisms loaded with torques. SUMMARY OF THE INVENTION: A shaft comprises supporting end and central portions. The central portion of the shaft is made with through longitudinal windows of equal length. The windows are evenly spaced circumferentially with a longitudinal offset from a plane perpendicular to the shaft axis. The centers of neighboring windows are placed on a wavy curve symmetrical to this axis. Diametrically opposite longitudinal through windows form several pairs of elements transmitting torque on the central portion of the shaft. 6 ill.

Description

The invention relates to the field of mechanical engineering, in particular to shaft structures of machines and mechanisms loaded with torques.

A known design of a coupler is selected as a prototype of the claimed technical solution, which consists of two half-couplings with paired end teeth. The tooth of each coupling half enters the cutouts of the crosspieces, which are wider than the tooth of the coupling halves. The crosses are interconnected by means of a torsion shaft and a tubular torsion bar. , The latter is provided with longitudinal windows to reduce stiffness. When assembling the coupling, the torsion shaft and the tubular torsion are twisted so that the tooth of the coupling halves is fixed by cutouts of the crosses without a gap.

The disadvantages of this design of the tubular torsion bar used in the known coupling are, first of all, that the longitudinal windows made on the central part of the torsion bar} allow to obtain several identical pairs of elements whose centers are located in one plane of rotation perpendicular to the longitudinal axis of the shaft, as a result of which the torsion becomes more susceptible to the resonance effect caused by torsional vibrations during transmission of the torque by the coupling.

An object of the invention is to increase reliability by damping torsional vibrations resulting from shaft rotation. The goal is achieved by the fact that on the hollow shaft containing the supporting end and central sections, the central section of the shaft is made with through longitudinal windows of equal length, which are evenly spaced with a mutual longitudinal displacement from the plane ... perpendicular to the shaft axis. Moreover, the centers of neighboring windows are placed on a wavy curve symmetrical to this axis.

The difference between the claimed device and the prototype is that the longitudinal windows of the same length, made on a cent (/

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of the hollow shaft, are located with mutual longitudinal displacement from the plane / tpendicular axis of the shaft, and the centers of adjacent windows are placed on a wavy curve symmetrical to this axis.

Thus, the distinguishing features are significant because, together with similar features, they provide the positive effect that is the object of the invention. The presence of distinctive essential features in the claimed technical solution indicates its compliance with the Novelty criterion.

 Additionally, a search for solutions known in science and technology that could contain features distinctive from the prototype showed that no known combination of features was found in known solutions. Therefore, it can be stated that the claimed technical solution meets the criterion of SIGNIFICANT DIFFERENCES.

Figure 1 shows a hollow elastic shaft in a perspective view; figure 2 is a longitudinal section; in Fig.Z - section aa in Fig.2; figure 4

- embodiment of a hollow elastic shaft with a solid support journal; figure 5 is a section bB in figure 4; figure 6 - scan of the outer surface of the hollow elastic shaft. The hollow elastic shaft contains end support sections 1, 2 and the central section 5. Over the entire surface of the central section 5, at equal intervals, with relative displacement, diametrically opposite through longitudinal windows 3 of the same length are made, which form several pairs of elements 4 transmitting the torque the moment from the end support portion 1 to the end support portion 2. The centers of adjacent windows are placed on a wavy curve 6, symmetrical to the axis of the shaft (see figure 6).

Claims (2)

SUMMARY OF THE INVENTION A hollow elastic shaft comprising supporting end and central portions, a central portion of the shaft is made with through longitudinal windows of equal length, arranged uniformly around the circumference, characterized in that, with During operation, torsional vibrations act on the hollow elastic shaft, which, on the one hand, characterize the variability of the transmitted torque MKR moment at the leading end supporting section 1, and on the other hand, directly the loads at the driven end supporting section 2. Arising vibrations tend to change the position of the end supporting sections 1 and 2 relative to each other. The magnitude of this work is proportional to the moment created by the transmitting elements 4. The angular movement of the end support sections 1 and 2 relative to each other is limited by the tensile strength of the transmitting elements 4. In comparison with the prototype, the claimed technical solution makes it possible to obtain a more reliable shaft transmitting torque and damping the torsional vibrations resulting from it, since the longitudinal shift of the transmission elements obtained as a result of the mutual longitudinal displacement of the through windows allows avoiding such a phenomenon as the resonance of the shaft in its operating range and significantly increase the critical speed . It is advisable to use this hollow elastic shaft in gearboxes transmitting torque from motors with an unfavorable arrangement of resonances to improve the torsional characteristics of the system. The use of a hollow elastic shaft of the proposed design will significantly push up the boundary of the critical revolutions of the system a gear motor, and thereby make it possible to obtain much greater power at the output, without significantly affecting the overall and weight characteristics of the gearbox. . in order to increase reliability by damping torsional vibrations arising during rotation, the windows are longitudinally offset from a plane perpendicular to the axis of the shaft, the centers of adjacent windows being placed on a fiber curve symmetrical about this axis.