Marine Steering Gear

These Marine Steering Gear incorporating the rapson slide principle are the most common in use on heavy duty applications. The rapson slide acting on either a fork tiller or the more common round arm. The tiller drives the rudder stock by means of a key or keys. The crosshead is free to slide along the circular arm of the tiller so that the straight line effort of the rams is applied to the angular moving tiller. Each set of two cylinders in line are connected by a strong steel girder usually called a "Joist" which stiffens the system and forms a "guide bar" for the crosshead guide slippers to slide along. The joist is often designed to incorporate the steering engine stops.

Basically, there are two types of Ram type marine steering gear:
(1) 1-ram-2cylinder type
(2) 2-ram-4cylinder type


1.1 The 1-ram-2 cylinder type hydraulic marine steering gear
(with Single fork tiller)


(1)Suitable for:
Containers, tankers, ferries, General cargo ships, passage ships, Dredgers and any other vessels that need more steering torque.
(2)Main Tech:
Max working torque: 40 KN.M a 500 KN.M
Max. mech. rudder angle: A 35 Degrees
Time of rudder movement: a 28 S
Rudder stock Diameter: 30