Pot-Shaped Component for Worm Gear Positioning in Hand-Held Power Tools

The patent introduces a pot-shaped component as an intermediary element between the brake drum and the drive shaft. This component simplifies the positioning mechanism by providing a standardized interface that accommodates the drive worm and oil pump pinion without requiring tight manufacturing tolerances on the brake drum or drive shaft themselves. The pot-shaped component acts as a mediator that absorbs dimensional variations and ensures precise positioning through its own precision features.

The positioning system is segmented into separate functional elements: the brake drum, the pot-shaped component, and the drive shaft. By dividing the positioning function across these segments, each component can be manufactured with more relaxed tolerances while maintaining overall positioning precision. The pot-shaped component serves as a distinct segment that provides the necessary precision through its own design features.

The patent employs a nested arrangement where the pot-shaped component is positioned within the brake drum structure, and the drive worm gear is integrated into the pot-shaped component. This nesting allows the drive worm gear to have a larger outer diameter for improved torque transmission while the overall device size is controlled by the compact brake drum housing. The components are arranged concentrically and in series, maximizing space utilization.

The patent utilizes the axial dimension and radial dimension strategically to accommodate the larger drive worm gear. The pot-shaped component extends axially within the brake drum, allowing the drive worm gear to achieve a larger outer diameter in the radial direction without proportionally increasing the overall device footprint. This dimensional arrangement optimizes the space-available ratio.

The patent specifies that the pot-shaped component and cup-shaped component can be manufactured from plastic materials with appropriate weight reduction benefits. The design incorporates parameter changes in the form of optimized geometric features, reinforcement structures, and precise molding techniques that enable plastic components to achieve the required positioning accuracy. The conical section and driver features are designed with dimensions that can be precisely reproduced through injection molding.

The patent allows for the use of composite materials or plastic materials with enhanced properties for the pot-shaped and cup-shaped components. These materials provide the necessary strength and precision while maintaining weight reduction. The composite approach enables optimization of both mechanical properties and manufacturing precision for weight-sensitive applications.

The patent integrates the brake drum with the pot-shaped component in a nested arrangement, where the pot-shaped component is positioned within the cylindrical section of the brake drum. This nesting allows the brake drum to maintain its cylindrical shape for effective brake band wrapping while minimizing the overall axial length. The drive pinion is also integrated into the brake drum structure, further compacting the assembly.

The patent merges the brake drum function with the drive mechanism by integrating the drive pinion directly into the brake drum structure. This combination allows the brake drum to serve dual purposes: providing the braking function through its cylindrical section and housing the drive mechanism. The flattening of the drive shaft in the brake drum area enables direct engagement with the drive pinion, eliminating the need for separate mounting structures and reducing axial length.