| 摘要 |
A rotary piston and cylinder device 1 comprising a rotor 2, a stator and a shutter disc 3, the rotor comprising a piston 5 which extends from the rotor into the cylinder space such that the rotor and the stator together define the cylinder space, where the shutter disc passes through the cylinder space and forms a partition therein. The disc comprises a slot 3a which allows passage of the piston therethrough, and a surface of the rotor and a surface of the stator opposing each other forming a close running surface pair, where at least one of the surfaces comprises an abradable coating which is provided with multiple recess formations such that the recess formations are discontinuous from each other. The abradable coating may be provided on the stator or the rotor. Preferably each recess has an angular circumferential extent on a respective surface of a maximum of 10 degrees. |
