Direct-Drive Grinding Spindle Layout for Internal Gear Precision
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Solution Overview
Problem
Existing grinding arrangements face challenges in achieving a compact design suitable for generating machining, particularly for internal gears, while maintaining precise control over tool movements and supporting high motor power, with issues in load assessment, measurement precision, and vibration recording due to long mechanical transmission paths and bearings.
Innovation Solution
A compact grinding arrangement with a stator and rotor design featuring inner and outer bearings, a directly driven external rotor, and integrated seals, allowing for precise tool control and measurement, and a direct mechanical transmission path to the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tool spindle is accommodated in a confined space with a grinding arm and belt drive, then the design can accommodate the tool spindle, but the mechanical transmission path becomes long and complex, reducing static and dynamic flexibility
Solution Approach 1:
The motor rotor is merged directly with the tool holder, eliminating the belt drive and intermediate transmission components. This integration creates a direct drive system where the motor rotor itself serves as the rotating part of the tool spindle, significantly shortening the mechanical transmission path and improving static and dynamic flexibility while maintaining compact space occupancy
2Device complexity
If conventional bearings are used with long mechanical transmission paths, then the structure is simple, but load assessment and vibration measurement become difficult due to separated measurement points
Solution Approach 1:
The bearing arrangement is extracted and reconfigured so that bearings are positioned directly at the rotor-stator interface, eliminating long mechanical transmission paths. This extraction and repositioning allows measurement systems to be placed close to the load introduction point, enabling precise load assessment and vibration measurement without the interference of long transmission paths
3Ease of operation
If the rotor is designed as a direct tool holder with integrated bearings, then the design becomes compact and flexible, but the bearing arrangement becomes more complex
Solution Approach 1:
The bearing configuration is inverted from the conventional approach where bearings support the stator, to a design where bearings directly support the rotor relative to the stator. This inversion allows the rotor to be designed as a compact direct tool holder with integrated bearing support, achieving mechanical flexibility while managing bearing complexity through a streamlined arrangement
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
Enables precise and dynamic machining of internal gears with improved load assessment and vibration measurement, reduced complexity, and cost-effective production by minimizing components and maintaining a compact, sealed unit.
Implementation Method 1
a drive motor having a stator and a rotor being arranged to rotate the second part relative to the first part, wherein the first part of the tool spindle is formed by the stator of the drive motor, wherein the second part is formed by the rotor of the drive motor
Implementation Method 2
at least one first bearing is arranged at a first axial position and at least one second bearing is arranged at a second axial position, and wherein the two bearings rotatably support the rotor relative to the stator
Data Source
AI summary
A tool arrangement, including a tool spindle having a fixed first part and a second part rotatably mounted relative to the first part. The second part carries a tool. A drive motor having a stator and a rotor rotates the second part relative to the first part. The first part is formed by the stator and the second part is formed by the rotor. The stator includes a first bearing that supports the rotor at a first axial position and a second bearing that supports the rotor at a second axial position. The first bearing has an inner ring arranged on the outer circumference of the stator, and an outer ring arranged on an inner cylindrical surface of the rotor. The second bearing has an outer ring arranged on an inner cylindrical surface of the stator and an inner ring arranged on an outer cylindrical surface of a cover that is connected to the rotor.