Abstract: A variable-capacity water pump includes a pump impelled fixed to a rotatable shaft for forcibly feeding cooling water from a cooling water passage, a mechanical seal disposed behind the pump impeller, a temperature sensor such as a thermostat mounted on the rotatable shaft and disposed in the cooling water passage for detecting the temperature of the cooling water, a thrust shaft disposed coaxially with the rotatable shaft and axially movable by the temperature sensor, and a disk secured to the thrust shaft for axial movement therewith, the disk being axially movable by the temperature sensor for varying a range of operation of the pump impeller. In response to a variation in the temperature of the cooling water, the temperature sensor axially moves the thrust shaft and hence the disk to vary the range of operation of the impeller, thereby changing the quantity of the cooling water flowing through the water pump.

Abstract: A variable contact seal mechanism which includes a rotatable shaft, a seal body having a wall member, and a seal member having a cylindrical portion secured onto the rotatable shaft and a tongue portion resiliently slidably contacting the seal wall such that continuous resilient contact force of the tongue portion with the wall is changed in response to rotational speed of the shaft. A bearing member is utilized which rotatably supports the shaft along with a mechanical sealing mechanism mounted so as to surround the shaft wherein the seal member is disposed between the bearing and the mechanical sealing mechanism.

Abstract: A drive shaft of a fan coupling assembly includes a shaft member fixedly connected with a fan drive rotor, and a flange member fixedly connected with a fan pulley. The two members are separately formed into their predetermined configurations. The shaft member has a securing portion and a flange coaxially formed at one end thereof, while the flange member has a central bore including a plurality of radially outwardly recessed portions. After the flange member is fitted on the shaft member through the central bore thereof, the two members are fixedly secured to each other by a securing member, whereby an integral flanged shaft may be obtained.