Driving mechanism of tapered pistons in bent-axis design axial piston pumps

In order to assure the quality of the bent axis design axial piston pumps driven by tapered pistons, it is necessary to know the characteristics of force applied to tapered pistons and the mechanism for driving the tapered pistons. Since they are able to perform both reciprocating and spinning motions in cylinder block, it is difficult to understand the driving mechanismand-tomeasure the forces applied to tapered pistons experimentally. In the presem study, the theoretical mechanism for driving the tapered pistons is studied by use of the geometric method. The driving area of tile tapered pistons is measured by measuring the strain of a cylinder forced against a tapered piston using an electric strain gauge and a slip ring. The forces applied to tapered pistons is also investigated with the change of discharge wessure and the rotational speed As a results of this investigation, it is concluded that the cylinder block is driven by one tapered piston in a limited area and flue driving area is changed due to space angle of the tapered pistons and the swivel angle of the cylinder block. It is also observed that the force applied to tapered pistons increases as the discharge pressure and the rotational speed increase.