Force parameters and operating characteristics of safety-overrunning ball-type clutch.

Abstract

Article deals with the field of machinery, namely with the protecting of devices for mechanical driving systems. New construction of safety-overrunning clutch, operating on gearing principle, where safety and overrunning parts are mutually integrated, has been proposed and studied in the article. It has practical importance for building, based on modular principles, machines. As the result of the theoretic studies, the expressions to calculate the following specific clutch torques have been obtained: rating torque, torques of beginning and ending of operation. On the basis of the mentioned studies, the expressions to estimate the clutch main operation characteristics have been obtained -nominal torque exceeding coefficient, accuracy and sensitivity coefficients. These expressions are practically important for proposed clutch calculations. The analysis performed demonstrates that in order to increase the clutch load capacity, the grooves must be made with less inclination angles to clutch axis. Obtained results indicate the advisability of installing the clutch on low-speed shafts. It is shown that the clutch overload sensitivity could be increased by the reduction of the spring rigidity. The calculations performed also demonstrate that balls diameter reduction has a positive effect on the clutch operation parameters. Obtained expressions and numerical results are practically important for proposed clutch calculations. It is shown that in terms of the accuracy of operation, the studied coupling fully corresponds to the level of common and investigated designs of safety clutches.

Safety-overrunning clutch elastic torque operation characteristic study

“…In [9] it is shown that using sprag-type clutches with heterogeneous wedges instead of rollers provides significant structure simplification. The latest research [10][11][12][13][14][15] directed to improve its characteristics despite well-studied disadvantages [16][17][18][19][20] that have their source in the friction energy transfer principle.…”

Load capacity and design parameters of ball-type safety-overrunning clutch with inclined grooves sides

“…New working principle in freewheel clutches -torque transfer through gearing balls and semi-couplings grooves is the source for new constructions creation [8][9][10]. On the basis of that principle new design of safetyoverrunning clutch, with safety and freewheel parts are integrated, was developed and researched by authors [11][12][13]. In this clutch grooves with parallel to radius side surfaces can lead to balls and internal semi-coupling grooves edge contact and significant contact stresses increasing.…”

“…Cognition obtained the equations ( 12) and (18) makes it possible to derive expressions for rate the clutch safety part basic operation characteristics, particularly rating torque exceeding coefficient ke (19) and accuracy coefficient γa (20) At the end of clutch operating in overload mode spring 7 (Fig. 1) reaches the deformation (21) [13]. )…”

Improvement of Bicycle Ball-Type Overrunning Clutch Operation

“…The developed and current DSTU 2278-93 clearly defines the main requirements for various types of mechanical clutches. In the well-known research works [2][3][4][5][6][7][8][9][10][11][12][13][14], new overrunning ball clutches are considered at various levels, and their operational capabilities are investigated. A particularly large volume of theoretical and experimental research is devoted to the development of new freewheeling ball clutches (FWBC) for multispeed bicycle rear hubs.…”

“…An analysis of the main operational parameters, technical project manufacturing, and metal clutch production has been carried out. An analysis of several scientific works dedicated to the development of a new type of rear hubs and their installation on production bicycles, as well as determining the performance of the new clutch under real operating conditions, has been conducted [2][3][4][5][6][7][8][9][10][11][12][13][14]. To carry out work processes without sliding of contacting elements and to significantly improve the load capacity and service life of mechanical drives with overrunning ball couplings.…”