SOREM can supply double joints using misaligned universal joint crosses (v. fig.1). This type of cross allows the assembly of larger bearings, and it is therefore suitable for transmitting greater twisting moments; they have lower axial side play while the radial side play is greater.

Another special product is the self supporting special joints (v. fig.2) used on bridges with independent suspension. They are extremely complex products with corresponding classic double joints. The self supporting system is made of a spherical ferrule on a fixed axle shaft with a hole; a supporting shaft slides into the hole in order to support the sliding axle shaft. The double joint must follow the vertical shock absorption movement.

This involves splitting the internal axle shaft into two parts, one of which slides into the other, to permit axial sliding and the necessity of another simple joint to connect the axle shaft inside the differential. In very particular cases we carry out an extremely detailed calculation of the joint, by first of all carrying out a dynamic simulation with a complete turn of the double joint. We obtain different radial loads of the agents on the bearings of the central body part and axle shaft to be able to carry out the relevant duration calculation.

From the simulation we also obtain different radial loads of the agents on the bearings of the central body part and axle shaft. We use this data to verify that the bearing’s bottom has been broken through using the finite element method in particular cases of working conditions with heavy loads and with a maximum amount of swerving. (See the RADIAL LOADS diagram)

The structural calculation is also carried out on the other components of the double joint (See the AXIAL LOADS diagram), on the cross and on the central body part to identify an optimal state on which to uniform resistance by eliminating concentration on the stress points.

The checking of the axle shaft is carried out on the shape and size of the eyelet and if requested by customers the checks can be extended to the rest of the axle shaft (see the picture).

Very long transmission shafts are one of SOREM’s typical products (see the picture).
In these cases we carry out an under torsion check, as well as checking the flexural vibration to determine its frequency and identify an optimal section to avoid reverberation phenomena.