entire system flow passing through the motor flows through the left hand and right hand spline connections which are the major torque connections in the motor utilizing the present invention each of the spline connections are continually lubricated by a portion of the main system flow passing through the splines and carrying away heat as well as metal particles and other forms of contamination a more specific advantage of the present invention is that as the speed of the motor increases and the frictional heat generated by the splines increases the fluid flow through the motor and therefore the flow of lubricant through the splines increases proportionately in other words by use of the invention the normally harmful effects of increased motor speed are self compensating in utilizing the present invention it is believed to be within the knowledge of those skilled in the art to modify either the external splines or the internal splines or both in order to provide sufficient flow area through each of the spline connections it is important to be sure that neither of the spline connections provide so much restriction to the flow of fluid therethrough as to generate a back pressure within the motor i e within the contracting volume chambers 55 which will reduce the torque of the motor in some situations it may be desirable to provide for a higher flow rate through one of the connections than through the other and it is believed to be within the knowledge of those skilled in the art to vary the relative flow rate through the left hand and right hand connections subsequent to a reading and understanding of the present specification it.