Direct-Drive Spindle Assembly for Compact Vibration-Resistant Tool Adjustment
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Solution Overview
Problem
Machine spindle arrangements for tools with cutting edge adjustment in machine tools are often space-consuming and prone to vibrations, lacking a rigid and compact configuration that allows for precise and vibration-resistant operation.
Innovation Solution
A machine spindle arrangement featuring a motor with a torque-proof rotor connection to the spindle, a direct drive system with a spindle neck for rigid support, an axially shiftable releasing sleeve for tool fixation, and an angle adjustment transmission for independent rotation of the traverse feed shaft, enabling a compact, rigid, and vibration-resistant setup with precise positioning and adjustment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional spindle arrangement with traverse feed shaft and angle adjustment transmission is used, then cutting edge adjustment capability is provided, but the arrangement becomes space-consuming and vibration-prone
Solution Approach 1:
The patent combines the angle adjustment transmission and traverse feed drive directly at the motor's rear side, merging previously separate functional groups into a unified compact arrangement. This integration eliminates intermediate transmission paths and reduces overall spatial requirements while maintaining full adjustment capability.
Solution Approach 2:
The traverse feed shaft is arranged concentrically within the spindle, with the angle adjustment transmission components nested around the motor shaft. This nested configuration allows multiple functional elements to occupy overlapping spatial volumes, significantly reducing the external dimensions of the spindle arrangement.
2Adaptability or versatility
If a conventional spindle arrangement with multiple functional assembly groups is used, then tool adjustment functions are provided, but rigidity and vibration resistance deteriorate
Solution Approach 1:
The patent extracts the angle adjustment transmission and traverse feed drive from the traditional intermediate positions between motor and spindle, and relocates them directly to the motor's rear side. This extraction eliminates flexible couplings and intermediate mounting structures that compromise rigidity, while maintaining all adjustment functions.
Solution Approach 2:
The spindle arrangement is segmented into distinct functional zones: the motor serves as the central rigid support, with the angle adjustment transmission and traverse feed drive as separate but integrated modules at the rear side. This segmentation allows each module to be optimized for its function while maintaining overall structural rigidity through direct motor mounting.
3Volume of moving object
If the spindle is directly connected to the motor rotor, then a compact direct drive configuration is achieved, but the traverse feed shaft connection becomes more complex
Solution Approach 1:
The motor shaft serves multiple functions simultaneously: it provides the primary driving torque to the spindle through direct connection, and it also serves as the mounting axis for the angle adjustment transmission and traverse feed drive. This multi-functionality eliminates the need for separate connection mechanisms, simplifying the overall structure despite the direct drive configuration.
Data Source
AI summary
The machine spindle arrangement (22) according to the invention forms a unit with a motor (19) as central element. At one side of the motor (19) a spindle neck (35) with a spindle (32) is flanged that is directly driven by the rotor (28) of the motor (19). The spindle (32) is a so-called null spindle that can be replaced without readjustment with all bearings and other wear parts due to the present exactly adjusted positioning surface (39) that abuts against an axially properly defined bearing contact surface (38). At the backside of the motor (19) facing away from the spindle (32), a tool releasing device (20) and an angle adjustment transmission (21) is arranged that serves to rotate a present traverse feed shaft (42) relative to the spindle (32). The traverse feed shaft (42) serves to actuate an adjustment device at the tool (15).