Handheld Tool Gear Unit Offset Output Shaft Cutting Depth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hand-held power tools have limitations in cutting depth and comfort due to the angular gear housing interfering with the workpiece, resulting in reduced maximum cutting depth and operator discomfort, especially when using tools like window milling machines or assembly milling machines.
Innovation Solution
The design features a gear unit with an angular gear and countershaft or auxiliary gear arrangement where the output shaft is positioned downstream and offset from the angular gear output shaft, allowing for maximum cutting depth and improved comfort by positioning the output shaft close to the front edge of the angular gear housing, enabling deeper cuts without housing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the angular gear housing is positioned in a conventional arrangement, then the structural stability is maintained, but the cutting depth is limited due to housing interference with the workpiece
Solution Approach 1:
The output shaft is positioned offset from the rotational axis of the angular gear output shaft, creating an asymmetric arrangement that moves the cutting tool into a different spatial dimension. This allows the cutting tool to extend beyond the conventional housing boundary without increasing the overall housing size, thereby achieving greater cutting depth while avoiding housing interference with the workpiece.
2Length of moving object
If the output shaft is positioned closer to the front edge of the angular gear housing, then the cutting depth is increased, but the structural complexity increases due to offset arrangement
Solution Approach 1:
The output shaft is deliberately positioned asymmetrically, offset from the rotational axis of the angular gear output shaft. This asymmetric arrangement allows the output shaft to extend to the front housing edge for maximum cutting depth while maintaining a compact overall structure. The asymmetry is achieved through the specific geometric relationship where the output shaft centerline does not coincide with the angular gear output shaft rotational axis, enabling space optimization without proportionally increasing device complexity.
3Length of moving object
If the output shaft is arranged downstream of the angular gear output shaft, then the cutting depth is maximized, but the device length increases
Solution Approach 1:
The output shaft and angular gear output shaft are arranged in a nested configuration where the output shaft is positioned downstream and offset from the angular gear output shaft. This nesting allows both shafts to occupy overlapping spatial regions rather than extending linearly, maximizing cutting depth while minimizing the overall device length. The offset arrangement enables the output shaft to extend to the front housing edge without requiring the device to be longer in the axial direction.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a hand-held power tool device with at least one gear unit (12) comprising at least one bevel gear (14) and at least one reduction and/or auxiliary gear (16), wherein the bevel gear (14) has at least one bevel gear input shaft (20) comprising a rotation axis (18), one bevel gear output shaft (24) comprising a rotation axis (22) and a bevel gear housing (26) supporting the bevel gear input shaft (20) and the bevel gear output shaft (24), and wherein the reduction and/or auxiliary gear (16) has at least one output shaft (30) comprising a rotation axis (28).It is proposed that the output shaft (30), viewed along a direction (32) away from the angle gear housing (26) and at least substantially parallel to the axis of rotation (18) of the angle gear input shaft (20), is arranged after the angle gear output shaft (24), wherein the reduction and/or auxiliary gear (16) has a housing (38) for a bearing of the output shaft (30) which is rotatably mounted on the angle gear housing (26).