Patent ID: 7228950
Filing Date: 2007-06-12
Classification: F16H

Abstract:
1. A fluid transmission apparatus used together with a vehicle change gear and having a lockup clutch, comprising: an input member which inputs a driving force from an engine to the fluid transmission apparatus; an output member which outputs the driving force from the fluid transmission apparatus to said vehicle change gear; a front cover coupled to said input member; a turbine coupled to said output member; a lockup piston which is arranged between said front cover and turbine and moved in an axial direction by a change in hydraulic pressure; a friction member formed on an outer portion of a surface of said lockup piston which opposes said front cover; a damper spring which connects said lockup piston and turbine; a support member for said damper spring which is fixed to a plurality of fixing portions on a predetermined circumference of said lockup piston which are inside said friction member; and projections projecting toward said front cover from positions on said lockup piston which are sandwiched by said fixing portions, wherein said projections and said fixing portions are arranged alternately in a circumferential direction and said projections radially extend from around an inner cylindrical portion of said lockup piston to an outer part of the fixing portions.