Modular motor

A modular fluid pressure operated motor assembly adapted for use with a forward package of the type comprising an output member, a housing, means disposed within said housing for rotatably supporting said output member relative thereto, and seal means disposed between said housing and said output member, whereby said housing is adapted to define a sealed cavity;

• said modular motor assembly comprising housing means defining a fluid inlet port and a fluid outlet port;
• fluid pressure displacement means associated with said housing means and including an internally-toothed ring assembly and an externally-toothed star member eccentrically disposed within said ring assembly, said ring assembly and said star member having relative orbital and rotational movement, said ring assembly and said star member interengaging to define expanding and contracting fluid volume chambers in response to said orbital and rotational movement;
• valve means cooperating with said housing means to provide fluid communication between said fluid inlet port and said expanding fluid volume chambers, and between said contracting fluid volume chambers and said fluid outlet port;
• means for transmitting said rotational movement to said output member;
• said housing means comprising a housing member disposed forwardly of, and immediately adjacent said ring assembly and said star member, said housing member defining a generally cylindrical pilot surface, and said housing of said forward package defining a mating, generally cylindrical internal surface;
• a plurality of bolts, each having a head end and a threaded end, each of said head ends being disposed in engagement with a forward surface of said housing member, each bolt extending axially through said housing member and said ring assembly, and having said threaded end in threaded engagement with said housing means, at a location rearwardly of said ring assembly, each of said bolts being disposed radially inwardly of said pilot surface and said cylindrical internal surface, whereby fluid leakage between said housing means and said fluid pressure displacement means is adapted to flow forwardly along said bolts, and into said sealed cavity defined by said housing of said forward package.