To provide an impeller for a fluid coupling, low in cost even in a structure without a core ring and suitable to secure assembling work efficiency and assembling accuracy.
At least one part on the inner peripheral side of an arcuate wall part 11 of a shell 2 constituting an outer shell with the arcuate wall section 11 having an arcuate cross section annularly in line with an outer peripheral cylindrical part 10 to form a fluid operating chamber, is provided with a plurality of slotted grooves 15 formed at circumferentially equal spaces in a state of inclining so that a groove centerline reaching a groove inlet center from a groove bottom center goes away from the rotation axis of the fluid coupling. A fan-shaped outer periphery 21 of a blade 3 is spaced from the inner surface of the arcuate wall part 11 of the shell 2, and in this state, an engaging claw 22 is fitted to the slotted groove 15 along the groove centerline. The fan-shaped outer periphery 21 is turned around a fitting part of the engaging claw 22 and slotted groove 15 as a fulcrum to contact the inner surface of the arcuate wall part 11 of the shell 2, and a ring member 4 fitted to the inner peripheral surface of the outer peripheral cylindrical part 10 of the shell 2 is engaged with the outer peripheral side end of the blade 3 to press and fix the blade 3 to the inner surface of the shell 2.
Masahiro Fujii
Yasunari Mita
Masaaki Iida