Rotary pump and braking apparatus using rotary pump

摘要

A rotary pump such as a trochoid pump is composed of a housing and a rotating structure including an inner rotor and an outer rotor. The rotating structure is rotatably enclosed in a rotor space formed in the housing. The rotor space is divided into a low pressure space communicating with an inlet port and a high pressure space communicating with an outlet port by a pair of peripheral seals disposed in radial grooves formed in an inner periphery of the housing and by a side seal disposed in an axial space between the rotating structure and the housing. The side seal is disposed in the axial space not to cover sidewalls of the radial grooves belonging to the high pressure space, so that the side seal is bent by the pressure in the high pressure space to effectively seal the axial space.