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| Mechanical |
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| Steering cylinders |
Kobelt Manufacturing makes steering cylinders from 1.25" I.D. to 10" I.D. The smaller models, up to 3" I.D., are made from bronze and stainless steel.
On the 4" to 10" series, the cylinder tube and spherical bearings are made from steel. The Piston Rods are made from stainless steel, and are hard chromed and polished. All castings are sand cast bronze or steel. On the larger cylinders, adjustable rudder stops and ¡°V¡± packings with adjustable packing nuts, are standard.
Our Models 7040, 7050, 7065, 7080, 7085 and 7093 are available in both balanced and unbalanced versions. The larger cylinder models 7094, 7096, 7097, 7098 and 7100 are not available in a balanced version. When using unbalanced cylinders, two or more must be used in a steering system.
The tables indicate rudder torque for both single and twin cylinder steering applications.
If a single cylinder is used in a manual hydraulic steering system, it is of utmost importance that the single cylinder is of a balanced type. ¡°Balanced¡± means that the linder piston rod extends out of the cylinder at both ends. This will give a balanced torque as well as equal volume displacementin both directions. The manual Helm Pump has a relatively small reservoir and using an unbalanced cylinder would cause the reservoir to overflow or the pump to run empty, which is unacceptable.
¡°Unbalanced¡± cylinders have the piston rod extending from the cylinder only on one side. Since two cylinders are connected to the same Tiller Arm or steering system, the volumes are balanced out again. The lines from the source of hydraulic pressure are crossed at the cylinders, providing equal volume displacement in both directions. |
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