Parallel-Axis Router Layout for Precise Belt Torque Transfer
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Solution Overview
Problem
Existing power tools lack ergonomic design and efficient torque transmission, leading to reduced precision and increased operational force required for guiding, especially in routing and groove-cutting applications.
Innovation Solution
A power tool design featuring a coaxial motor axis and output axis arranged parallel and at a specific distance, utilizing a belt drive for torque transmission, and incorporating an ergonomic hand-rest surface with adjustable elements and safety switches for enhanced usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional motor and output shaft arrangement is used, then the device structure is simple, but the torque transmission efficiency is reduced and operational force is increased
Solution Approach 1:
The patent transitions from a conventional coaxial motor-output shaft arrangement to a parallel axis arrangement where the motor axis and output axis are separated by a specific distance (50-80mm). This dimensional change enables more efficient torque transmission through the belt drive system while maintaining structural compactness.
Solution Approach 2:
A belt drive system is introduced as an intermediary mechanism between the motor shaft and output shaft. This intermediary enables efficient torque transmission across the parallel axes while allowing for flexible adjustment and maintaining a compact overall structure.
2Power
If the motor axis and output axis are arranged coaxially, then the device structure is compact, but the torque transmission precision and operational control are reduced
Solution Approach 1:
The patent adopts a parallel axis configuration instead of coaxial arrangement, positioning the motor axis and output axis parallel to each other at a controlled distance. This enables precise torque transmission through the belt drive while maintaining a compact footprint through optimized spacing.
Solution Approach 2:
The patent specifies optimal distance parameters between the parallel axes (50-80mm, preferably 65mm) to achieve the best balance between torque transmission precision and device compactness. This parameter optimization ensures efficient power transfer while keeping the device volume minimal.
3Ease of operation
If the hand-rest surface is positioned away from the output axis, then the operator comfort is improved, but the guiding precision and operational control are reduced
Solution Approach 1:
The patent positions the hand-rest surface asymmetrically on the first housing, specifically arranged to be intersected by the output axis. This asymmetric positioning allows the operator's hand to be comfortably positioned over the output axis, simultaneously achieving ergonomic comfort and precise guiding control.
Solution Approach 2:
The hand-rest surface is positioned such that it creates an equipotential position for the operator's hand relative to the output axis, allowing natural hand placement that maintains both comfort and precision. The output axis passes through the hand-rest surface, creating an optimal operational position.
4Measurement precision
If adjusting elements are arranged outside the space between motor shaft and output shaft, then the adjustment mechanism is simple, but the routing depth adjustment precision is reduced
Solution Approach 1:
The adjusting elements are positioned in the space between the motor shaft and output shaft, utilizing the available volume efficiently. This positioning enables precise routing depth adjustment through coarse and fine adjustment mechanisms without adding external complexity to the device structure.
Solution Approach 2:
The adjusting elements are nested within the existing structure between the motor shaft and output shaft, with coarse and fine adjustment mechanisms arranged in a compact configuration. This nesting approach achieves precise multi-stage adjustment while maintaining a simple overall device structure.
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 design achieves a compact, ergonomic, and precise power tool with reduced operational force and improved handling, enabling efficient routing and groove-cutting with adaptable torque transmission and enhanced safety features.
Implementation Method 1
the transmission of torque from the electromotive drive to the output shaft is effected via a belt drive
Data Source
AI summary
A power tool, in particular a router, includes a motor shaft, at least one output shaft defining an output axis that is coaxial with the output shaft, and at least one electromotive drive acting on the motor shaft. The motor shaft defines a motor axis with the electromotive drive which is coaxial with the motor shaft. The motor axis and the output axis are arranged substantially parallel to and at a distance from one another.