| 摘要 |
PCT No. PCT/GB92/01917 Sec. 371 Date Apr. 15, 1994 Sec. 102(e) Date Apr. 15, 1994 PCT Filed Oct. 19, 1992 PCT Pub. No. WO93/08374 PCT Pub. Date Apr. 29, 1993.The present invention relates to a wing motor of the type suitable for use in down-hole drilling applications. The motor comprises a generally tubular casing 1, 2 and a rotor 4 mounted for rotation within the casing 1, 2 with a chamber 18 therebetween. The casing 1, 2 is provided with angularly spaced apart inlets and outlets 19, 20 for ingress of pressurized working fluid from an inlet conduit 19a in the casing 1, 2 into the chamber 18 and egress of the fluid to an outlet conduit 20a separated from inlet conduit 19a by a wall 21. The casing 1, 2 has a generally radially extending wall 3 extending more or less into contact with the rotor 4 at an angular position between the outlet 20 and the inlet 19. The rotor 4 has a plurality of angularly spaced apart wings 15 mounted in generally radially extending recesses 16 so as to be displacable therein from a generally radially projecting position in substantially sealing engagement with the inner casing 2 to a generally retracted position when traversing the radially extending wall 3 which have a rising portion 3a which progressively approaches the rotor 4, and a falling portion 3d which recedes from the rotor 4. According to this invention the generally radially extending recesses 16 have trailing the walls 102 which extend, at least at radially outward portions, at an angle of at least approximately 90 DEG with respect to the the rising portions 3a of the walls so that, in use of a motor, the wings 15 are retractable upon engagement with the rising portions 3a substantially free of resistance from engagement axially against the side walls of the recesses 16.
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