Hat-Shaped Crown Wheel Reduces Angle Grinder Height
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Solution Overview
Problem
Conventional angle grinders are limited in accessing poorly accessible work regions due to their tall transmission housing, which restricts their usability in areas with sections oriented at acute angles.
Innovation Solution
The crown wheel is designed in a hat shape with a recess facing the tool and toothing on the side remote from the tool, allowing the tool spindle and its bearing device to be positioned within the transmission housing, reducing the axial installation space and enabling a flat construction that minimizes the height of the transmission housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission housing is designed with conventional components arrangement, then the structural strength and component support are ensured, but the height of the transmission housing increases, reducing accessibility to poorly accessible work regions
Solution Approach 1:
The crown wheel is designed with a hat-shaped configuration where the toothing is positioned radially outside an elevation on the side remote from the tool. This spatial reorganization allows the bearing device to be arranged at the level of the crown wheel within the transmission housing, effectively utilizing axial space and reducing the overall height of the transmission housing in the region of the tool spindle.
Solution Approach 2:
The bearing device is positioned within the recess formed by the hat-shaped crown wheel configuration. The concentric portion of the flange extends into the recess to form an accommodating region for the bearing device, creating a nested arrangement that maximizes space utilization and minimizes the axial footprint of the transmission housing.
2Length of stationary object
If the crown wheel is designed in hat shape with recess facing the tool, then the axial installation space is reduced and flat construction is achieved, but the complexity of crown wheel manufacturing increases
Solution Approach 1:
The crown wheel is segmented into distinct functional zones: the elevation bordering the recess, the radially outer toothing positioned on the side remote from the tool, and the hat-shaped configuration. This segmentation allows for optimized manufacturing processes for each zone, such as separate machining operations for the toothing and the hat shape, thereby reducing overall manufacturing complexity despite the innovative geometry.
3Length of stationary object
If the bearing device is arranged at the level of the crown wheel within the transmission housing, then the axial installation space is saved and transmission housing height is minimized, but the bearing device requires precise positioning and securing mechanisms
Solution Approach 1:
The securing function is merged with the existing flange structure. The concentric portion of the flange extends into the recess to form the accommodating region for the bearing device, and the same flange structure provides the securing function through axial securing elements. This integration eliminates the need for separate positioning and securing mechanisms, reducing overall device complexity while achieving compact bearing device arrangement.
Data Source
AI summary
A motor driven angle grinder is described and which includes an electric motor; a transmission coupled to the electric motor and which includes a motor shaft and a tool spindle; a crown wheel in the form of a hat is provided and which forms a recess that receives the tool spindle and a bearing, and wherein the crown wheel defines toothing which surrounds the recess, and wherein the transmission housing and the angle grinder have low relative height profiles which permits the angle grinder to be used in restricted or tight space working environments.