| 摘要 |
A fluid drive system in which a forged alloy steel impeller rotated by an input shaft at a constant speed drives a runner through a fluidic coupling, wherein selectively variable differential speed between the impeller and runner is produced by varying the amount of oil between the impeller and runner, wherein both the impeller and runner have radially extending vanes between them defining pockets between them with a bottom surface, the impeller is provided with reinforcing elements integral with the vanes, each reinforcing element spanning a pocket and being clear of the bottom surface. The runner can also be provided with such elements. In any case, the vanes and reinforcing elements are machined from a forged alloy steel billet, by a multi-axis Computer Numerical Controlled (CNC) milling machine under three-dimensional control with specialized tooling. The vanes can be planar but at an angle either to the face or to the radius, or vanes which are curved, or twisted, as required to optimize the fluid performance of the fluid drive can be provided. Preferably, the impeller and runner are provided with facing lips at a rim section, the lips projecting toward one another in direct confrontation beyond a plane defined by free edges of the vanes. Also preferably, the free edges of the vanes are rounded on a radius about half of the width of the free edge before being rounded.
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