Improvements in and relating to viscous fluid coupling devices.

摘要

A driven member for a viscous shear fluid coupling has a housing part which comprises a spider member (21) of steel or other ferrous metal having an annular centre boss (25) with a bore which receives a journal bearing (15). The spider member (21) hat a plurality of radially extending arms (29). A step (16) on each of the radially extending arms (29) acts as a location spigot for a fan or other driven device. The radially outer end of each of the arms (29) terminates in a respective boss (33) which extends in a direction parallel to the spider and coupling axis. An annular disc member (23) is fixed co-axially to the spider member (21). The annular steel disc member (21) has a bore (39) of smaller diameter than the bore (27) of the spider member centre boss (29) and an outer periphery attached to a cover part (19). A respective threaded stud is located in the bore (33) of each boss (31) at the termination of each radial arm (29). The studs (18) are fixed to the annular disc member (23) or to the spider member (21).