Device for turning movements (swivelling) at a limited angle (approx. 60° up to a maximum of 360°). A distinction is made between (Figure S 41):
The most simple construction type, which requires the most space, works with toothed rack pistons, which enter into a transversally mounted sprocket (a). This construction type can be built for up to 2 x 360° pivoting angles and offers the largest torque; pressure range up to 200 bar.
Another group of piston swivel motors has the pistons arranged in an axial direction and transfers the torque over steep threads with different designs (b). Suitable for pivoting ranges of up to 360°.
Rotor swivel motors generate their torque directly through fluid admission of a rotating wing to allow hydraulic fluid, which is connected to the drive shaft (c). Very compact design with a pivoting angle range up to approximately 310° (in the case of two rotating wings: approx. 110°). Allows for moderate moments; pressure range up to 200 bar.
Figure S 41: Working scheme of the swivel motors