Nested Drive Assembly for Variable-Speed Home Appliances
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Solution Overview
Problem
Existing home appliance drive systems lack efficient mechanisms for varying rotational speeds and compact design, limiting their versatility and size reduction in food processing applications.
Innovation Solution
A drive assembly featuring a center shaft with a nested second drive component, including a sun gear and planetary gears, which allows for differential rotational speeds and a compact configuration by offsetting the motorized unit, enabling interchangeable attachments and reduced vertical height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional drive system is used, then the structure is simple, but the rotational speed variation capability is insufficient and the size is large
Solution Approach 1:
The patent implements a nested drive component configuration where the second drive component is positioned within the cavity of the first drive component. Both components rotate about the same central axis, with the first drive component having a larger radius than the second. This nesting arrangement enables multiple rotational speeds from a compact structure, resolving the contradiction between speed variation capability and device complexity.
Solution Approach 2:
The patent utilizes the radial dimension by positioning drive components at different radii from the central axis. The first drive component rotates at a first rotational speed while the second drive component rotates at a second rotational speed, with both components sharing the same central axis but operating at different radial positions. This dimensional approach enables speed variation without increasing axial height, addressing both versatility and compactness requirements.
2Length of stationary object
If a conventional drive system is used, then the manufacturing is straightforward, but the vertical height is large
Solution Approach 1:
By nesting the second drive component within the cavity of the first drive component, the patent significantly reduces the vertical height of the drive assembly. The counterweights are positioned at different radial distances from the central axis within the same axial space, eliminating the need for stacked configurations and thereby reducing overall height while maintaining manufacturability.
Solution Approach 2:
The patent applies local quality by positioning counterweights at specific radial distances from the central axis - the first counterweight at a first radial distance and the second counterweight at a second radial distance. This localized differentiation enables functional diversity (different rotational speeds) within a compact vertical footprint, balancing manufacturing simplicity with height reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The drive assembly achieves efficient speed variation and compact design, enhancing the versatility and size reduction of home appliances like blenders and food processors, improving their operational capabilities and user experience.
Implementation Method 1
The second drive component includes a sun gear mounted for rotation with the center shaft and at least one planetary gear. The at least one planetary gear is configured to rotate about the sun gear.
Data Source
AI summary
A drive assembly for use in a piece of home equipment is provided including a center shaft having a central axis. A first drive component has a cavity formed therein and is configured to rotate about the central axis. A second drive component is at least partially nested within the cavity. The second drive component is configured to rotate about the central axis. The first drive component is operably coupled to a first rotary coupling and the second drive component is operably coupled to a second rotary coupling.