The cilinder with end position cushioning

Animation of a cilinder with end position cushioning

When a cilinder reaches the end of the stroke the piston and rod are decelerated to standstill. The kinetic energy resulting from this, must be absorbed by the end stop, the cilinder head or cilinder cap. Its capacity to absorb this energy depends on the elastic limit of the material. If the kinetic energy exceeds this limit the cilinder needs an external or internal end position cushioning. In this example we use an internal end position cushioning. When the piston with the cushioning bush travels into the bore in the cilinder cap the fluid must exhaust from the piston chamber by means of the adjustable throttle valve. This throttle valve regulates the degree of cushioning.

Bosch Rexroth