Mud motor assembly

Abstract

A longer-lasting, lower cost, more powerful, all metal, mud motor than the presently available progressing cavity type mud motors for drilling boreholes into the earth. A mud motor apparatus possessing one single drive shaft that turns a rotary drill bit, which apparatus is attached to a drill pipe which provides high pressure mud to the mud motor, wherein the drive shaft receives at least a first portion of its rotational torque from any high pressure mud flowing through a first hydraulic chamber within the apparatus, and receives at least a second portion of its rotational torque from any high pressure mud flowing through a second hydraulic chamber within the apparatus. The mud motor apparatus possesses two hydraulic chambers, each having its own power stroke, and return stroke, and acting together in a controlled fashion, provide continuous power to a rotary drill bit.

What is claimed is: 
     
         1 . A method to add a flared portion means to a loosely fitting piston means that forms a moving hydraulic seal within a pressurized hydraulic chamber so as to reduce any flow rate of fluids bypassing said loosely fitting piston means. 
     
     
         2 . A method to add a flared portion means to a loosely fitting piston means that forms a moving leaking seal within a pressurized hydraulic chamber so as to reduce any mud flow rate of fluids bypassing said leaking seal.