The influence of friction on the force interaction of ball overturn couplings

Abstract

Problem. The article presents the main results of studies on the influence of slippage of new overrunning clutches at the beginning and at the end of their contact with the working surfaces of the half-coupling grooves. In order to expand the functionality in terms of limiting the maximum torque while simultaneously performing classic functions, when calculating new ball overrunning clutches, it is necessary to take into account the forces of friction between the balls and the supports. Goal. This fact forms the basis for setting the task of this research, where a comparison of the force interaction of the balls with the working surfaces of the grooves of half-clutches without taking into account frictional forces and taking them into account is carried out. Methodology. It should be emphasized that at present, in the starters of cars and other automobile and road equipment, free-running roller clutches are used, which transmit power due to the frictional forces that arise between the jammed rollers and the working surfaces of the half-clutches. However, they tend to slip, especially in winter, when it often skids. In order to improve the starting process of internal combustion engines of automobile and road technical equipment, several overrunning ball couplings have been developed and patented, which transmit torque according to the principle of engagement of balls located in the grooves of the leading and driven half-clutches. Originality. The conducted research has confirmed that the developed ball safety clutches can also be used as torque limiters in wrenches and starters of various vehicles instead of traditional roller overrunning clutches. Such a variety of application possibilities of these devices poses new challenges for a more complete study of the processes of connection and disconnection of power kinematic chains of vehicles. According to the results of the analysis of the forceful interaction of balls with the working surfaces of the grooves, half-clutches follow such scientific and practical conclusions. The forces between the balls and the side surfaces of the grooves of half-clutches for various working and non-working conditions of the clutches are determined. Practical value. The ratio between the basic elements of the new overt ball clutch in the working and not in the working states without taking into account and taking into account the force of friction is considered. It is established that for large clutches it is necessary to take into account the force of friction especially with increased requirements for the accuracy of adjusting the device at a certain rotational moment. For small-sized ball overrunning clutches, friction force is significantly affected by the accuracy of their operation. Clarifying the marginal dimensions of these clutches, which must take into account friction, will be the task of further research.