Motor Spindle Rotary Feedthrough Module Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor spindles face challenges with complex maintenance and repair due to spatial limitations and leakage issues with integrated rotary feedthroughs, leading to difficulties in rotor replacement and bearing realignment, as well as fretting corrosion and increased installation complexity.
Innovation Solution
A motor spindle design featuring a modular rotary feedthrough module positioned axially outside the annular cylinder, allowing for separate handling and attachment, along with axially spaced bearing assemblies to simplify rotor exchange and maintenance, and a rotary feedthrough bearing arrangement to prevent vibrations and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotary feedthrough is integrated within the ring cylinder, then the coolant supply is provided, but the structure becomes complex and maintenance becomes difficult due to spatial limitations
Solution Approach 1:
The rotary feedthrough is separated from the ring cylinder and designed as an independent modular unit. This segmentation allows the rotary feedthrough to be manufactured, serviced, and replaced as a separate component without affecting the ring cylinder or other spindle components, thereby reducing structural complexity while maintaining coolant supply reliability.
2Reliability
If the rotary feedthrough is integrated within the ring cylinder, then the coolant supply is provided, but leakage cooling fluid cannot be drained off easily
Solution Approach 1:
The rotary feedthrough is extracted from the integrated structure and positioned externally on the spindle housing. This extraction provides easy access to the rotary feedthrough components, allowing leakage cooling fluid to be drained off easily and enabling straightforward maintenance and repair operations without disassembling the ring cylinder or other internal components.
3Ease of operation
If the bearing arrangement is directly inserted into the spindle housing, then the spindle replacement is simplified, but fretting corrosion occurs on the outer rings
Solution Approach 1:
A bearing carrier is introduced as an intermediary component between the bearing arrangement and the spindle housing. The bearing carrier is firmly connected to the spindle shaft and carries the bearing arrangement, allowing the spindle assembly to be replaced as a unit while preventing direct contact and fretting corrosion between the bearing outer rings and the stationary spindle housing.
4Device complexity
If the bearing outer rings are directly accommodated in the spindle housing, then the structure is simplified, but a large amount of play is required for insertion
Solution Approach 1:
The bearing carrier serves as a mediator that pre-assembles the bearing arrangement with precise alignment to the spindle shaft. This intermediary structure eliminates the need for large insertion play, as the bearing carrier and its mounting features ensure proper positioning and concentricity when the spindle assembly is installed in the spindle housing.
5Reliability
If a long rotatable transfer pipe is provided for coolant supply, then the coolant can reach the rotor, but careful handling is required during insertion
Solution Approach 1:
The transfer pipe is merged with the rotary feedthrough module, forming an integrated coolant supply system. The transfer pipe extends from the rotor through the ring cylinder and connects to the rotary feedthrough, which is positioned externally on the spindle housing. This merging allows the transfer pipe to be supported and guided by the rotary feedthrough structure, reducing the need for careful manual handling during insertion while maintaining coolant supply to the rotor.
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
Facilitates easy rotor replacement and maintenance, reduces the risk of fretting corrosion, and enhances coolant transfer efficiency, while maintaining concentricity and reducing installation complexity.
Implementation Method 1
the motor spindle is designed with internal cooling, which can be supplied with a cooling fluid via a coolant supply
Implementation Method 2
a rotary feedthrough which is designed to press the rotating component and the stationary component together under spring force in a sealing manner
Implementation Method 3
or hydraulically and/or pneumatically is clamped axially against the rotating component
Implementation Method 4
or hydraulically and/or pneumatically is clamped axially against the rotating component
Data Source
AI summary
The invention relates to a motor spindle (10) for a machine, in particular for a machine tool (12), comprising: - a spindle housing (14) for stationary mounting on the machine, - a spindle assembly (40) removable from the spindle housing (14) with a rotor (46) rotatably mounted in an integrated bearing arrangement (42, 44) relative to the spindle housing (14), and - a clamping mechanism (56) for a tool, which can be actuated via a clamping piston (28) movable in a ring cylinder (26) in the spindle housing (14), wherein the spindle assembly (40) is designed with internal cooling, which can be supplied with a coolant fluid via a coolant supply, wherein the coolant supply has a rotary feedthrough which has an interface between a stationary component and a rotating component of the coolant supply, and wherein the bearing arrangement (42, 44) can be removed along with the spindle assembly (40) when it is removed from the spindle housing (14).In this motor spindle (10) the rotary feedthrough is designed as a rotary feedthrough module (30) which is arranged in an area on the spindle housing (14) that lies axially outside the ring cylinder (26).