lesson 18 Steering gear (舵机、操舵装置) 轮机英语教学课件

are moved.
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If a heavy sea strikes the rudder, the shock is transmitted through the tiller to the rams, this cause a sudden increase in oil pressure in one of the cylinders and the system.
accomplished.
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According to the way the steering gear is operated, the steering gear may be divided
into three kinds: hand-steering,
followup (随动) steering and
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The other end of this lever is connected through a safety spring link to the rudder stock or tiller.
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The telemotor is the receiver of
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If the pressure t above normal, double spring-loaded relief valves allow the tiller to give way slightly by by-passing a little of the oil into the other cylinder.
situated on the port side of the tiller(舵柄) and another ram on the starboard side,
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linked at their outer ends to the
tiller arm by a crosshead and
the other ends of the rams working inside their own hydraulic cylinders and pipes connect these cylinders to a hydraulic pump.
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The tiller is firmly keyed to the
at its outer end to the hunting gear(随动机构).
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A four-ram hydraulic steering gear may be fitted in large ships for greater steering power,
from the bridge (wheel house).
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The second one provides the force, when required, to move the rudder to that angle.
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The third is the means by which the movement of the rudder is
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It comprises a transmitter(发 送器), a receiver, pipes and a charging unit(充电装置).
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The transmitter, which is built
into the steering wheel console
Lesson 18 Steering gear
(舵机、操舵装置)
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(i) the steam steering gear, (ii) the hydraulic steering gear, (iii) the electric steering gear
and (iv) the electro-hydraulic
the hydraulic remote control system from wheel on the bridge.
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The linkage through the floating lever of telemoter, pump and rudder stock forms the hunting gear.
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The cylinder unit has a control
spindle(轴) connected to it by
a pin.
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This control spindle operates
(舵轮控制台), is located on the
bridge and the receiver is mounted on the steering gear.
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Two rams in the transmitter move in opposite directions as the steering wheel is turned.
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The resultant displacement of the
rudder, tiller and ram crosshead moves the pump control rod through the hunting gear and the tiller is automatically brought back to its proper position.
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The pump is only required to deliver oil when the steering wheel is moved.
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The hunting gear returns the pump operating rod to mid position as soon as the
act on the tiller to produce double the turning effect.
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The pump control is moved by
the telemotor(液压传动操 舵 装 置 ) through a floating
lever.
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and the position of a movable plate or a floating ring inside
the pump controls the suction and discharge of the oil.
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When the plate or ring is in mid position, no oil is drawn;
rudder stock.
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The pump is of special construction and may be axial or radial design.
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The pump runs continuously in the same direction driven by an electric motor,
instead of the two-ram type.
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It is simply a double two-ram unit, so that the force of two
diagonally opposite rams can
helmsman(舵手) stops turning
the wheel.
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When the rudder has moved
through
the
angle
corresponding to the wheel
position, it will remain there
until the wheel and telemotor
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The fluid in the cylinders of the transmitter is therefore pumped down one pipe line and drawn in from the other.
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The pumped fluid passes through piping to the receiver and forces the telemotor cylinder unit to move.
when the plate or ring is moved
in the opposite direction, the
suction and discharge of the oil
is reversed in direction.
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The plate or ring is actuated by a control rod which is attached
steering gear.
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The total system may be
considered made up of three
parts: control equipment, a power unit and a transmission to the rudder stock(舵杆).
swivel block(转动滑块),
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Crosshead & swivel block
Control rod
Tiller arm
Ram
Rudder stock
Hunting gear
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Crosshead & swivel block
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when the plate or ring is moved in one direction from mid
position, oil is drawn from one cylinder and discharged into
the other;
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Power unit
Rudder stock
Tiller
Control
Transmission
equipment unit
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Rudder
The first part conveys(传递) a signal or desired rudder angle
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The control equipment of steering gears
Telemotor control The
telemotor has become, on many vessels, the standby steering mechanism, used only when the automatic steering fail.
automatic steering.
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The electro-hydraulic gear is now the most widely applied.
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A two ram( 撞 杆 ) hydraulic
gear consists of a hydraulic ram