medium from the reservoir to the shear space application_number US 36710994 A description referring to fig1 a viscous fluid clutch 120 includes a housing 12 which includes a rear wall 14 having a hub 16 which is rotatably mounted by a suitable bearing 18 on a drive shaft 20 the housing 12 further includes a finned cover member or front wall 22 which has an annular flat surface 24 formed adjacent its peripheral edge the latter being confined by an annular lip 26 in an annular recess 28 formed on the housing 12 cooling fins 30 are formed on the outer surface of the rear wall 14 a divider wall 32 is confined in a second annular recess 34 formed on the front wall 22 radially inward of the annular recess 28 a third annular recess 36 is doemws in the rear wall 14 radially inward of the first mentioned annular recess 28 and outward of the second annular recess 34 a clutch plate 38 is secured at its center by any suitable means to the drive shaft 20 the outer peripheral portion of the clutch plate 38 is freely located in an operating chamber 40 formed by the third annular recess 36 adjacent portions of the clutch plate 38 and the front wall 22 are provided with torque transmitting.