Motor Spindle Modular Assembly for Maintenance
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Solution Overview
Problem
Conventional motor spindles with internal coolant systems require significant technical effort for maintenance and repair, often necessitating the removal of the entire spindle unit from the machine, which is cumbersome and time-consuming.
Innovation Solution
The motor spindle design allows for easy separation and removal of the work spindle, rotor, and clamping unit from the housing by loosening a few screws, enabling on-site inspection and repair, with a rotary feedthrough sleeve and wear-resistant seals for sealing and support, and a stable support ring for reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire spindle unit is removed for maintenance, then complete inspection and repair can be performed, but the maintenance process becomes time-consuming and cumbersome
Solution Approach 1:
The motor spindle is divided into two separable assemblies: a housing assembly containing the stator and a work spindle assembly containing the work spindle, rotor, and clamping unit. This segmentation allows the work spindle assembly to be removed and replaced independently for maintenance, enabling complete inspection of critical components without removing the entire spindle unit, thus reducing maintenance time while maintaining reliability.
Solution Approach 2:
The work spindle assembly (containing rotor, clamping unit, and roller bearings) is extracted as a separate serviceable unit from the housing assembly. This extraction allows maintenance personnel to remove and service the critical rotating components independently, performing complete inspection and repair on the work spindle assembly without needing to dismantle or remove the stationary housing assembly, significantly reducing maintenance time.
2Loss of time
If the work spindle assembly is made detachable for easy maintenance, then maintenance time is reduced, but the structural integrity and stability may be compromised
Solution Approach 1:
The motor spindle is segmented into a stationary housing assembly and a movable work spindle assembly that can be detached for maintenance. The housing assembly contains the stator and provides structural support, while the work spindle assembly contains the rotating components. This segmentation enables easy maintenance while the housing assembly maintains overall structural stability during operation.
Solution Approach 2:
A connecting structure with screw connections acts as an intermediary between the housing assembly and work spindle assembly. This intermediary mechanism provides a stable, rigid connection during operation to ensure structural integrity, while allowing the work spindle assembly to be easily detached for maintenance by simply loosening the screw connections, thus balancing stability with maintainability.
3Productivity
If internal coolant supply is integrated into the clamping unit, then cutting performance and tool life are improved, but the device complexity increases
Solution Approach 1:
The coolant supply system is merged with the clamping unit by integrating a rotary feedthrough directly into the clamping unit structure. The coolant channel runs through the clamping unit's actuating mechanism, combining the clamping function and coolant delivery function into a single integrated component. This reduces overall device complexity compared to having separate coolant supply systems while maintaining high cutting performance through effective internal coolant delivery to the tool.
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
This design simplifies maintenance and repair by allowing on-site work without disassembling the entire spindle, reducing effort and time, while maintaining the benefits of internal coolant systems for high cutting performance and tool longevity.
Implementation Method 1
against the force of a spring assembly
Implementation Method 2
actuated by a hydraulic ring cylinder
Implementation Method 3
The sleeve and the nozzle each having a wear-resistant seal sliding ring
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a motor spindle for machine tools, comprising a spindle housing (25) mounted on a machine part, a working spindle (1) mounted in the spindle housing (25) in axially spaced rolling bearings (14-16), an electric drive motor (7, 27) whose stator (27) is mounted in the spindle housing (5) and whose rotor (7) is mounted on the working spindle (1), a clamping unit (2) for a tool arranged in the working spindle (1), which can be actuated by a hydraulic ring cylinder (34) against the force of a spring assembly (5), and an internal coolant supply (33, 4) to the tool integrated into the clamping unit (2), which has a rotary feedthrough (37) for the coolant arranged inside the hydraulic ring cylinder (34).For the purpose of technically simple and cost-effective execution of maintenance and repair work on the motor spindle, the working spindle (1) with the rotor (7), the clamping unit (2) and the bearing arrangements (14-16) is designed as a modular assembly which can be mounted from the front into the spindle housing (25) which carries the stator (27), wherein the ring cylinder (34) for releasing the clamping unit (2) and the rotary feedthrough are arranged in an end part of the spindle housing (25).