Rotary fluid pressure device and improved integral brake assembly

A rotary fluid pressure device of the type including a housing defining a fluid inlet and a fluid outlet;

• a rotary fluid displacement mechanism including an output member having one of orbital and rotational movement, said mechanism including a brake portion extending axially rearward from said output member;
• and operably associated with said output member such that braking movement of said brake portion results in braking of said output member;
• and said housing defining a generally cylindrical brake chamber, and a piston member disposed in said brake chamber, said piston member being moveable between a first, retracted position under the influence of fluid pressure in said brake chamber and a second, engaged position under the influence of a biasing spring disposed in engagement with a rearward side of said piston member;
• characterized by:
• (a) said housing defining a set of internal threads disposed adjacent said piston member;
• (b) an enclosure member having a forward surface comprising a spring seat for said biasing spring;
• and
• (c) said enclosure member defining a set of external threads in threaded engagement with said set of internal threads, whereby the axial location of said enclosure member and said spring seat is adjustable in response to rotation of said enclosure member to vary the load holding torque of said brake portion.