Two axial gap motors are attached facing each other to the input shaft.

This drive device is provided with a gear unit and axial gap motors.

The present invention provides a fluid dynamic bearing on a thrust plate of a hub/shaft/thrust plate assembly suitable for use in ultra small form factors having limited axial space.

For that purpose, a compression crown (15) is associated with an axial gap to one of the spirals (spiral 7) and the second spiral (spiral 9) is forcibly driven within the compression crown (15).

A first sleeve (24) and a second sleeve (25) are placed around a shaft (23) at a predetermined axial distance from one another and are radially pressed.

Axially interspaced (A1) cylindrical vapor shields (70,73;71,74) are fixed to the wing parts of said components.

The swellings extend as far as the height of the teeth and return towards the internal diameter of the base of the support body with an increasing axial distance from said teeth.

Constriction is effected first on a closely-limited length of the sausage and the constricted part is then enlarged by axial expansion of the squeezing tools over the distance between the clips.

Compression chambers (35) arranged with an axial gap between the spirals (7, 9) of the spiral compressor (1) are fed by compression pockets (45) and support the nested spirals against each other.

The axial distance of the supporting elements in relation to each other corresponds to at least 0.66 times the value of the pitch of the helical element (2).

Two axial gap motors are attached facing each other to the input shaft.

The center electrode and the J-gap ground electrode define an axial spark gap there between.

This drive device is provided with a gear unit and axial gap motors.

The present invention provides a fluid dynamic bearing on a thrust plate of a hub/shaft/thrust plate assembly suitable for use in ultra small form factors having limited axial space.

For that purpose, a compression crown (15) is associated with an axial gap to one of the spirals (spiral 7) and the second spiral (spiral 9) is forcibly driven within the compression crown (15).