Testing device for multiple piston assembly of cam-lobe hydraulic motor and testing method

A testing device for a multiple piston assembly of a cam-lobe hydraulic motor, comprising a driving plate, a driving shaft, cylinder blocks, a central shaft, a cylinder block base, a motor and a rotating speed and torque sensor;

• wherein the motor, the rotating speed and torque sensor and the driving shaft are coaxially connected successively, and the driving shaft passes through a center of the cylinder block base and is rotationally connected with the cylinder block base;
• N cylinder blocks are uniformly arranged on the cylinder block base along a circumferential direction;
• one side of the central shaft passes through the cylinder blocks and is rotatably connected with the cylinder blocks, and the other side is fixed on the cylinder block base;
• the driving plate is installed on the cylinder block base and is capable of rotating around a mounting hole of the driving shaft of the cylinder block base;
• N driving plate clamping grooves are evenly distributed along a circumference, and a bottom of each cylinder block is provided with a cylinder block protrusion;
• each cylinder block protrusion is clamped in the driving plate clamping groove at a corresponding position and is connected with the driving plate clamping groove in a sliding manner;
• when the driving plate is rotated, the N driving plate clamping grooves drive the N cylinder blocks, through cylinder block protrusions, to rotate synchronously around respective central shafts of the N cylinder blocks, in such a manner to change a pressure angle between the driving shaft and a piston assembly on the cylinder block;
• the cylinder block is provided with a fixing bolt for fixing the cylinder block on the cylinder block base during testing to limit the rotation of the cylinder block;
• and
• the cylinder block is provided with a piston hole, and the piston assembly to be tested is installed in the piston hole.