Radial piston engine

In a radial piston engine having a rotatable eccentric with a peripheral surface, a piston bearing against said peripheral surface of the eccentric for being driven by said eccentric during rotation thereof, a guide body slidably engaging said piston, said guide body having a longitudinal axis and guiding said piston for travel longitudinally of said guide body, said guide body having an outer end remote from said eccentric of convex spherical shape, a housing means having a surface of concave spherical shape which receives said outer end of convex spherical shape of said guide body and supports the same for swivelling movement, said housing means having an opening which communicates with said surface of concave spherical shape, said opening receiving a pressure medium which applies pressure to said outer end of said guide body, said outer end of said guide body undergoing swivelling movement through an angular travel in opposite directions as said piston undergoes longitudinal travel in said guide body, the improvement wherein:

• said outer end of said guide body has an end face which is subjected to the pressure of said pressure medium, said end face being formed to expose a portion of said surface of concave spherical shape of said housing means to said pressure medium during the swivelling movement of said outer end of said guide body through its entire angular travel in opposite directions to produce a force on said end face acting in the longitudinal direction of said guide body of substantially constant magnitude.