Japan Marine Science and Technology Center

Natsuo Inagaki

Hidehiko Kaneda

Hitoshi Yamaguchi

An underwater hydraulic tool has a hydraulic motor with an inlet port and an outlet port for receiving and discharging water under pressure and a rotating shaft rotated by water under pressure with the front end protruding from said motor for holding a working tool. A rear mounting member is attached to a rear part of the hydraulic motor and has openings spaced circumferentially therearound. A front mounting member is attached to a front part of the hydraulic motor and also openings spaced circumferentially therearound. At least portions of the openings in both members are located outwards of the outer circumferential wall of the hydraulic motor. The mounting members support the hydraulic motor in a hollow space in a housing with the front end of the rotating shaft protruding forward of the housing, the rear mounting member having the periphery thereof engaged with the inner wall of said housing defining the space and the front mounting member being fixed to the housing at the opening of the hollow space with at least portions of the openings in the front mounting member being inwards of the inner wall of the housing. The exterior of the hydraulic motor is spaced from the inner wall of the housing to leave a gap therebetween through which the water under pressure discharged from the outlet port flows along the hydraulic motor through the openings in the rear and front mounting members and past the front end of the shaft.

Growing community of inventors

Yokohama, Japan

Natsuo Inagaki