| 摘要 |
PCT No. PCT/SE79/00182 Sec. 371 Date May 6, 1980 Sec. 102(e) Date May 2, 1980 PCT Filed Sep. 6, 1979 PCT Pub. No. WO80/00592 PCT Pub. Date Apr. 3, 1980.A gear machine comprising two helical gears running in mesh with each other, a first sealing body coming against one end surface of the gear pair, a fluid port in the first sealing body and a second sealing body coming against the outside circles (K) of the gears, at least at one gear meshing zone, is improved in that the tooth tops of the gears are adapted for sealing against the tooth bottoms of the gears in a plane (P) through the axes of the gears, the coacting teeth of the gears thus mutually seal along the whole of the pitch point line, and that the orifice of the port facing the gears substantially comprises a zone including the union of surfaces each defined by the outside and root circles (K and L, respectively) of the respective gear between the axis plane (P) and a gear radius (R) forming an angle ( alpha ) with the axis plane (P), said angle ( alpha ) at most attaining Bx(1/R)xtangent beta , where B is the width of the gearwheel pair, R is the outside circle radius of the respective gear, and beta is the helix angle of the gears, the angle between the axis plane and the gear radius being less than 2 pi . If the angle ( alpha ) is substantially equal to Bx(1/R)xtangent beta , the machine is useful as a hydraulic pump. If the angle ( alpha ) is less than Bx(1/R)xtangent beta , the machine is useful as a precompressing compressor. |
