We have developed a new water gate hoist model driven
by multiple hydraulic motors. The conventional hoists
for large or high lift gates are operated by motor-driven
winches. Since the application of hydraulic motors eliminates
the reduction gears and fan brakes required for
motor-driven devices, it meets the increasing requirements
to reduce cost and to make more compact devices.
Two or more hydraulic motors directly connected with
a winch drum generate the necessary torque to operate
a water gate. Our device has the advantage in cost
and operability over those of our competitors. One of
the features is that our device is operative even if one
of the hydraulic motors fails.This report outlines the new
water gate hoist model and discusses the results of
the laboratory tests conducted to demonstrate its performance.