Orbital hydraulic motors are designed for rotary drives with a torque of 100 Nm up to some 1000 Nm and for the speed of the drive shaft up to 500 min-1. It is also necessary to take into account the efficiency of the whole motor, which is under the influence of several parameters that need to be described. To this end, we designed a device for separate testing of the effects of friction in the axial direction between the pressure and the valve plate with a relatively rotating rotor and a rotor ring. The device is mounted vertically and aligned in height with three shelfs. The lower shelf on which the drive unit of the test drive hydraulic engine is mounted. Medium shelf, on which a test hydraulic motor and a propulsion system are fixed. Upper shelf, on which the hydraulic cylinder is attached, for pushing on the tested hydraulic motor. The construction of the device is assigned according to the carrying capacity of the assumed loading conditions, which consists of an axial force of 150 000 N and a torque of 1000 Nm. In addition, we also took into account the financial constraints and conditions of the environment in which the device will be located. Depending on the assumed measurement conditions, an appropriate propulsion system has been selected, which will ensure uniform regulation of the rotational speed from 0 to 50 min-1 and the propulsion system, with which we will provide a regulated thrust force of up to 150 000 N.
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