9 - AHP Merkle GmbH

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Two-force cylinder – pushing
There are certain applications in which very different motion characteristics lead to an optimal manufacturing
process. In practice it can be observed that in some applications high (breakaway) forces are required at the
beginning of a motion, and then comparatively low forces are needed for the remaining motion. In such cases
the cylinders are designed for the largest force that has to be applied.
As a more cost-effective alternative to this, AHP Merkle has developed two-force cylinders, which are designed
so that they can execute various force and speed profi les. This is possible through the use of two concentric
piston rods running one inside the other. Their advantage is the high force generated at the beginning of the
motion, and the subsequent automatic switching to higher travelling speeds at the same fl ow rate.
Two-force cylinder – pulling
In this hydraulic cylinder option with stepwise force and motion characteristics the linear drive is designed for
pulling. Here, too, two concentric piston rods run one inside the other. First a large piston with a correspondingly
large ring surface receives pressure, which results in high force generation and low speed. Once the large piston
is located at the housing wall and the pressure is only acting on the ring surface of the smaller piston, the force
is reduced, and at the same time the travelling speed of the cylinder increases.
In contrast to the „Two-Force Cylinder – pushing“, the option „Two-Force Cylinder – pulling“ develops the
greatest force when the piston rod is extended.
Two-force cylinders are for the most part always customer-specifi c solutions.
This means that AHP Merkle adapts the changeover point from high force to
high speed in accordance with individual customer requirements.
Cylinder parameters en
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