Aisin Seiki Kabushiki Kaisha

Koyo Seiko Company, Ltd.

Minoru Kinbara

Hiroaki Toyoda

Naoki Minamoto

Atsushi Chiba

Hirofumi Dodoro

Yukitoshi Murakami

Akira Nakai

A joint structure of an annular member and a shaft member softer than the former is produced by

Joint structure of annular member and shaft member

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. The water pump of the present invention can supply a quantity of cooling water necessary and sufficient to cope with the detected temperature of the cooling water without any unwanted power loss and with an increased degree of efficiency.

Temperature responsive blade shroud-disk for thermostatic water pump

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.

Variable contact centrifugally operated seal mechanism

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Toyota, Japan

Minoru Kinbara