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In a positive-displacement hydraulic motor a valve is mounted so as to be moved positively, individually and continuously during the operation of the hydraulic motor. Spacings between adjacent pairs of valve ports, variable volume chambers and cam portions of the guide element are selected from a pr

In a positive-displacement hydraulic motor a valve is mounted so as to be moved positively, individually and continuously during the operation of the hydraulic motor. Spacings between adjacent pairs of valve ports, variable volume chambers and cam portions of the guide element are selected from a predetermined relationships. Such an arrangement makes it possible to predetermine the mode of operation for the hydraulic motor by selecting previously the speed of the movement of the valve.

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A positive-displacement hydraulic motor comprising: a guide element; a valve; a block of variable volume chambers; ports made in the surface of said valve and grouped in pairs so that one port of the pair communicates with a delivery line and the other one communicates with a discharge line; distrib

A positive-displacement hydraulic motor comprising: a guide element; a valve; a block of variable volume chambers; ports made in the surface of said valve and grouped in pairs so that one port of the pair communicates with a delivery line and the other one communicates with a discharge line; distribution ports made at the side of said unit of the variable volume chambers facing said valve; each of said chambers of said block communicated by means of a commutation channel with one of said distribution ports; a closer member accommodated in each of said chambers of the block and being in a permanent engagement with a surface of said guide element facing thereto; a surface of said guide element facing said block and divided into cam portions so that said closer member performs a complete stroke within the limits of each of said separate cam portions; said variable volume chambers of said unit and cam portions having spacings being not aliquant with respect to each other; said valve being capable to perform a positive, independent and continuous movement during the operation of the motor; said variable volume chambers of said block; said pairs of ports of the valve and said cam portions of the guide element having spacings which are selected respectively from the following relationship: 1 n K = + Qr qz qx whereby with a predetermined speed of the valve the operating conditions of the hydraulic motor can be preselected, wherein: qr, qz, qx are spacings between pairs of ports of the valve, variable volume chambers and cam portions of the guide element respectively; n and K are factors selected to provide a predetermined ratio between the speeds of the guide element, block of variable volume chambers and the valve, the factor n being equal to an integer including null, and the factor K being equal to any integer which is represented by a co-prime number with respect to the greatest possible number of non-coherent variable volume chambers except for null and number fulfilling the relationship: qx K =-n qz wherein the factor K correlates the numbers of the variable volume chambers in order of their arrangement in the block with the numbers of the distribution ports in order of their arrangement on the surface facing the valve so that each value of numbers of one of these elements and the product of the number of another element communicating therewith through the communication channel by factor K represent modulo residues of a maximum possible number of non-coherent variable volume chambers.