SK8248Y1 - Flexible shaft clutch with spiral springs - Google Patents

Abstract

The flexible shaft clutch with spiral springs consists of a drive wheel (1) and a driven wheel (2), which flexible connection is designed by means of spiral springs (3). The flexible shaft clutch allows the transmission of load torque in one direction which is unwinding direction of winding spring.

Description

S K 8248 Υί

Technical field

Flexible shaft couplings with coil springs belong to the field of flexible shaft couplings intended for the transmission of mechanical energy in mechanical drive assemblies.

BACKGROUND OF THE INVENTION

Flexible shaft couplings are used for the flexible transmission of torque between the drive and driven shafts. The flexible transmission of torque is made possible by the use of metal or rubber elastic elements. In addition to torque transmission, the flexible couplings also provide for radial and axial position deviations of the shafts to be coupled, as well as damping torsional vibrations and shocks.

An important parameter of flexible shaft couplings included in mechanical systems with periodically varying torque is their dynamic torsional stiffness, as it affects the natural torsional frequency of the mechanical assembly of the drive system. In general, as the torsional stiffness of the flexible coupling decreases, the value of the natural torsional frequency of the mechanical system decreases. If any natural frequency of the system is equal to the frequency of some harmonic component of the excitation moment, the system is in resonance. Such a condition is undesirable for the mechanical system, since it increases the amplitude of the transmitted torque, thereby increasing the stress and noise of the mechanical system.

In order to tune the mechanical system in terms of torsional vibration, it is necessary to select a flexible shaft coupling with suitable dynamic torsional stiffness so that the harmonics of the excitation torque components with the natural frequencies of the mechanical system are not resonated in the operating speed range. It seems advantageous to use a flexible coupling with such a low torsional stiffness that, if possible, all the natural frequencies of the system are lower than the excitation frequencies. In this case, the mechanical system operates in the supercritical region. The resonance passage then only occurs during acceleration and deceleration, which, however, due to the speed of these transients can not cause any serious problem. Therefore, they are used to use flexible couplings with the lowest torsional stiffness. high spring shaft couplings.

The essence of the technical solution

Flexible spring couplings with coil springs represent a new approach to achieving the lowest torsional stiffness of flexible shaft couplings. Coil springs are produced in different designs, either as constant-force springs or as springs with a given force curve depending on the stroke.

The use of metal winding springs as a resilient element makes it possible to achieve a large twist angle and thus a low torsional stiffness. The low torsional stiffness is advantageous in terms of tuning the mechanical system for working in the over-resonance area as well as for shock absorption. It is also possible to achieve the desired load characteristic of the flexible coupling by applying a suitable coil spring. Since there is friction between the support surfaces and the coil of the springs when the springs are being unwound, the coupling will have the damping effect required, in particular during acceleration and deceleration, to damp the transient oscillation. The advantage of metal spring members is that they do not change their properties due to temperature, vibration frequency, as is the case with rubber spring elements.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings, a flexible shaft coupling with coil springs is shown in Figure 1 in the direction of the axis of rotation, Figure 2 in a view perpendicular to the axis of rotation, Figure 3 is a detail of the coil spring fastening and Figure 4 is a detail of the cover fastening.

An exemplary embodiment

The resilient shaft coupling with coil springs consists of a drive disc 1 and a driven disc 2, the resilient connection of which is provided by winding springs 3. The windings of the winding springs 3 are inserted between the supporting surfaces 4. The ends of the winding springs 3 are inserted into the slots 5 and their position The cover 7 is secured to the front of the drive disk 6 to prevent the winding of the winding springs 3 from jumping out of the space between the support surfaces 4. The cover 7 is fixed to the drive disk 2 by means of screws 8 and washers 9. Torque between drive the disc and the driven disc 2 are transmitted by pressure at the points of contact between the support surfaces 4 and the windings of the winding springs 3. The proposed flexible coupling

With K 8248 Υί, it is possible to flexibly transmit the load torque in one direction, in the winding direction of the winding coils 3. When the coupling is twisted, friction occurs on the contact surface between the winding coils 3 and the support surfaces 4.

Industrial usability

The flexible shaft coupling with coil springs can be applied in mechanical drive assemblies. Coil springs such as flexible coupling members make it possible to achieve a high value of twist angle, low / torsional stiffness and good damping properties. Last but not least, the metallic elastic members do not change their mechanical properties due to aging and fatigue. A flexible shaft coupling with coil springs will therefore increase the technical level and reliability of the mechanical systems in which it will be engaged.

Claims (1)

S K 8248 Υί PROTECTION REQUIREMENTS A spring coil with winding springs consisting of a drive disc, a driven disc, coil springs and slots, characterized in that between the drive disc (1) and the driven disc (2) are inserted coil springs (3) oriented with the same direction of unwinding on the axis of rotation of the coupling and are fixed in the slots (5). 1 \ drawing