Patent ID: 8257042
Filing Date: 2012-09-04
Classification: F16H

Abstract:
1. A fluid drive device comprising: a shell constituting an internal space for retaining a working fluid and capable of rotating about a rotation axis; a blade engaging with the shell; and a pressing member pressing said blade against said shell, said shell having a groove into which a portion of said blade is fit formed at an inner peripheral surface, in a state where the portion of said blade is fit into said groove, said pressing member pressing said blade to fix said blade to said shell, said groove forming an acute angle θ with respect to a meridian of the shell passing through the groove, said groove extending in a longitudinal direction, having one end opened and an other end closed, and having a width larger on a side of the one end than on a side of the other end, said groove designed to have a portion smallest in width in the longitudinal direction to be equal to a width of the portion of said blade, and a width of said groove varies in a depth direction of said groove and is larger in a shallow portion than in a deep portion of said groove, and said groove including first and second side surfaces facing each other and extending from said one end to said other end of said groove, and said blade applied with a pressing force having a portion brought into contact with the entire first side surface and located to provide a gap between said blade and said second side surface.