Linear Couplings Combine Kinematic Properties

Couplings in the usual sense actually serve to transmit torques while compensating for possible misalignments - in other words, to connect them to rotating shafts. The situation is different with purely linearly moving axes, in which linear actuating pulses are executed and axial lifting forces are transmitted. For these tasks, a so-called linear coupling must have special kinematic properties. The coupling manufacturer Schmidt -kupplung offers the Loewe GK Linear series for this. The job of these axially rigid couplings is the precise transmission of pure linear lifting forces while at the same time compensating for high radial and angular displacement values.

The program comprises 5 sizes

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The Loewe GK series is designed for the transmission of purely linear actuating impulses through electric cylinders or through hydraulically and pneumatically operated actuators. The program comprises 5 sizes with outer hub diameters from 27 mm to 100 mm and is available to the designer for maximum axial loads between 800 N and 13,000 N depending on the coupling size. In the standard version, the axially rigid couplings of this series for shaft connection are equipped with an internal thread on both sides. The threads are available in sizes M6 to M48. Combinations of internal thread and threaded pin or with clamping hubs in a bore diameter range from 6 mm to 50 mm are also optionally available.

Combined kinematic properties

The structure of the Loewe GK Linear consists of two aluminum hubs, in each of which 2 lubrication and maintenance-free plastic plain bearings are pressed. In an inner ring there are four coupling bolts arranged at an angle of 90 ° to each other. This middle part, which is similar to a cross, can now pivot on the one hand in the plain bearings. However, since it is not fixed in the half of the joint compared to a universal joint, it can consequently also be displaced by a defined amount in the sliding bushes if the shafts are offset radially. The coupling principle thus combines the kinematic properties of a shaft joint with those of a cross slide coupling.

This simultaneous swiveling and linear movement in the bearings enables combined angular and radial displacement compensation over a short axial length. Depending on their size, the axially fixed couplings compensate for parallel displacements of up to 2.5 mm and angular displacements of up to 3 °.

Content of the article:

• Page 1: Linear couplings combine kinematic properties
• Page 2: Precise transmission of axial forces

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