| 摘要 |
1489169 Grinding CATERPILLAR TRACTOR CO 24 June 1976 [24 Nov 1975] 26272/76 Heading B3D A method of machining an end surface 22 of a housing 12 for a slant axis rotary mechanism having a slant angle # and a rotor-to-shaft-tohousing timing relationship S R /S S /S H comprises rotating the housing about its central axis A at a first rate of rotation R 1 with the end surface engaged by a grinding tool 108, and simultaneously rotating the housing about a second axis B intersecting the axis A at an angle 0 at a second rate of rotation R 2 , the rates of rotation being defined by the relationships R 1 = n(S H -S R ) and R 2 =n(S S -S R ), when n is an arbitrarily selected average angular velocity. In apparatus for carrying out the method, the grinding tool is mounted on the shaft of a motor 106 carried by a pedestal 102 from a base 100. The housing 12 is mounted on a workholder 112 carried by a shaft 110 which is journalled in a carriage 114 and secured to a worm-wheel 116 meshing with a worm 118 carried by a shaft 120 also journalled in the carriage. A timing gear 122 is fixed to the worm 118 and meshes with an idler gear 126, in turn, meshing with a second timing gear 128 which is fixed to a worm 132 carried by a shaft 130 journalled in the carriage and driven by a motor 140. The worm 132 meshes with a stationarily mounted worm-wheel 134 on a stationary shaft 136 which is fixed to the base 100 and journals the carriage for rotation about the axis B which intersects the axis A of the shaft 110 at the angle 0. Rotation of the shaft 130 by the motor 140 causes rotation of the carriage 114, and hence the shaft 110 and housing 12, about the axis B simultaneously with rotation of the shaft 110 and housing about the axis A so that the grinding tool produces the desired shape on the end 22 of the housing 12, the rates of rotation R 1 , R 2 about the axes A, B, respectively, being determined as above. In another embodiment, the grinding wheel is reciprocated towards and away from the axis A to produce grinding marks which promote longer life of seals used in the rotary mechanism. The grinding wheel may be shaped and guided to produce a convex or concave configuration on the end surface 22. |
