Planetary Roller Gear Drive Axial Preload Adjustment

The spindle nut is divided into two separate nut parts arranged axially one behind the other, with an intermediate ring inserted between them. This segmentation allows the planets to be simultaneously engaged with both nut parts and the threaded spindle, creating sufficient axial loading to prevent slippage while maintaining a relatively simple overall structure.

An intermediate ring is introduced as a mediator component between the two nut parts. This intermediate ring has a specific width that enables the planets to roll on its surface while also engaging with the threaded spindle and nut parts, thereby ensuring adequate axial loading and preventing slippage without requiring complex structural modifications.

The intermediate ring is designed with an adjustable width rather than a fixed precision dimension. The ring can be shifted axially to adjust the spacing between the two nut parts, allowing the planets to achieve proper rolling engagement through simple axial positioning rather than requiring precise manufacturing of the ring width. This dynamic adjustment capability greatly simplifies the manufacturing process.

Instead of controlling the intermediate ring width as a fixed parameter, the design changes the approach by making the axial position of the intermediate ring the adjustable parameter. The ring width can be manufactured with standard tolerances, and the correct engagement is achieved by adjusting the axial position of the ring relative to the nut parts, thereby avoiding complicated precision manufacturing requirements.