Housing Ring Guide Sections for Gear Head Alignment
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Solution Overview
Problem
The alignment of the gear head relative to the rotor shaft in handheld power tools is often imprecise due to the direct screw fastening method, leading to reduced service life of the tool.
Innovation Solution
A housing ring with guide sections and an air guide section is introduced to center and align the gear head and electric motor, allowing for a compact design and improved alignment, with concentric guides and an axial collar providing additional support for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gear head is fastened to the housing with screws, then the assembly is simple and direct, but the alignment of the gear head relative to the rotor shaft becomes imprecise
Solution Approach 1:
The housing ring serves as an intermediary component between the gear head and the housing. It provides guide sections that precisely guide the gear head into correct alignment with the rotor shaft, while the screws simply secure the assembly. This mediator resolves the contradiction by separating the alignment function (handled by the housing ring's guide sections) from the securing function (handled by the screws).
Solution Approach 2:
The housing is segmented into multiple components: the housing ring with guide sections, the gear head, and the housing body. This segmentation allows each component to perform its specific function - the housing ring provides precise guidance, the gear head provides gear engagement, and the housing provides structural support. The guide sections are further segmented into multiple radial sections that collectively provide 360-degree guidance.
2Ease of operation
If the gear head and electric motor are separately mounted, then assembly is straightforward, but the overall dimensions of the power tool increase
Solution Approach 1:
The housing ring merges multiple functions into a single component: it serves as both the mounting structure for the gear head and the positioning structure for the electric motor. The guide sections on the housing ring simultaneously guide the gear head and position the motor, eliminating the need for separate mounting and positioning features. This integration reduces the overall tool dimensions while maintaining ease of assembly.
3Manufacturing precision
If multiple guide sections are provided on the housing ring, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The housing ring is designed as a universal component that performs multiple functions: it provides structural support for the gear head, guides the gear head into precise alignment, positions the electric motor, and serves as a mounting surface for screws. By making the housing ring multi-functional, the patent avoids the need for separate alignment fixtures, mounting brackets, and positioning devices, thereby reducing overall device complexity while maintaining high alignment precision.
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
This solution enhances the alignment and centering of the gear head and electric motor, leading to improved mechanical stability, reduced manufacturing costs, and easier assembly, while maintaining a compact tool size and reducing vibration transmission.
Implementation Method 1
an air guide section, in which a fan is accommodated that is attached to the rotor shaft, is formed on the side of the housing ring facing away from the housing
Data Source
AI summary
A handheld electric power tool, in particular an angle grinder, having a housing in which an electric motor is accommodated that drives a rotor shaft that is connected in a force-transmitting manner to an output unit accommodated in a gear head. A housing ring is provided that makes available at least one guide section for the gear head and a guide for the electric motor. An air guide section, in which a fan is accommodated that is attached to the rotor shaft, is formed on the side of the housing ring facing away from the housing.