Description of coupling with face ropes tangential arrangement in the mode of obverse and reverse

Protsenko V. Klementyeva O.
Abstract: 
Development and study options couplings with high torsional stiffness and low has prospects for many sectors of machinery. In particular couplings of machine tools used for connecting shafts in the kinematic chain supply, division and others. must have high torsional rigidity. Therefore, in such cases often have special design couplings high torsion rigidity - semi-plate couplings and couplings in a cylinder with slits bellows type structures. Faultlessness these joints decreases with increasing their size due to high radial stiffness and greater value gaps, misalignment and thus drives in heavy machines. Another drawback of these couplings are to support heavy loads and high cost. Drives the main motion, on the contrary, may require installation socket compliant to promote the reduction of dynamic loads, which increases the durability of parts and tools on the quality of treated surfaces. In the main motion drives installed machines are often non-metallic couplings with elastic elements such MPVP couplings and joints supple with a star, characterized by well-known disadvantages. In view of the above, the improvement of existing ones, develop and study new design parameters joints is an urgent task. As a result of experimental and theoretical studies found that coupling of the tangential location ropes while working modes obverse and reverse with equal sizes are pliant than couplings with a chordal ropes. Obverse mode (operating tension cables) coupling the two types are rigid and can be recommended for installation in drives are required high kinematic accuracy. In reverse mode (when using ropes compression) coupling a rope with a face is more gentle than the characterization of chordal a coupling cables and an extended area almost zero rigidity. However, coupling with tangential ropes is 30% lower load capacity compared to the coupling, equipped with ropes chordal arrangement. It is shown that the greatest load capacity coupling with ropes arranged tangentially in its work mode provides reverse angle ξF = 49º. The increase compared with the angle ξ value ξF = 49º significantly reduces its load capacity (at ξ = 65º T = 148 Nm at ξ = 80º TTP = 140 nm) and extends the characterization by increasing the angle of twist φ. Reducing the angle ξ compared with the value ξF = 49º causes a significant reduction in load capacity and expansion almost zero area. With its reduction to the value ξ = 25º elastic coupling time is reduced by 20%, twisting angle φ increases with 8,5º to 12,5º. Reducing the angle ξ to 20º magnitude causes reduction in the coupling by 30% and increase the angle of twist φ of 8,5º to 15º. Established that the work of the couplings of tangentially spaced ropes obverse mode of torsional rigidity increases the range of the angle ξ = 20º ... 35º, and when it begins to decline further increase, and the most suppleness coupling has a value of angle ξ = 90º.
Received: 
Friday, February 17, 2017
Accepted: 
Friday, February 17, 2017