Spindle Bearing Housing Cooling Without Larger Outer Diameter
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Solution Overview
Problem
The existing bearing device design increases the outer diameter size due to the formation of a flow path for coolant, which can lead to reduced axial load capacity and increased size, compromising the device's efficiency and stability.
Innovation Solution
A spindle device with a cylindrical bearing housing featuring internal flow paths and external grooves connected by elastic members, allowing coolant flow without increasing the outer diameter, and a motor housing with grooves connected to the flow paths for enhanced cooling and load support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling jacket is attached to the outer peripheral surface of the housing to form a flow path, then cooling performance is improved, but the outer diameter size increases
Solution Approach 1:
The flow path is nested inside the bearing housing by forming internal cavities and channels within the housing structure itself. The coolant flows through these internal passages without requiring any external attachment, thus achieving cooling functionality while maintaining the original outer diameter dimensions of the housing.
Solution Approach 2:
Instead of adding cooling functionality in the radial direction (which would increase outer diameter), the flow path is designed to extend in the axial direction within the housing. Multiple flow paths are arranged at different axial positions, allowing efficient cooling while keeping the radial dimensions unchanged.
2Temperature
If the outer diameter size of the bearing housing is increased, then cooling capability is improved, but the axial load support capacity is reduced
Solution Approach 1:
The cooling flow paths are nested within the existing bearing housing structure, utilizing the internal volume without increasing external dimensions. This ensures that the housing maintains its original load-bearing cross-sectional area while providing effective cooling through internal coolant circulation.
Solution Approach 2:
The cooling system is segmented into multiple independent flow paths arranged at different positions and axial locations within the housing. This segmentation allows optimized cooling coverage without requiring an increase in overall housing size, thereby preserving axial load support capacity.
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 maintains the outer diameter size, ensuring stable axial load support and efficient cooling of the spindle device without increasing the bearing housing diameter, thus preventing size-related inefficiencies.
Implementation Method 1
a first elastic member (30a) closes an opening of the first groove (24)
Implementation Method 2
a cooling oil flows in a flow path defined by the cooling oil groove and the cooling jacket so as to cool the housing
Data Source
AI summary
A spindle device includes: a rotation shaft; a bearing housing having a cylindrical shape extending in a direction of a center axis of the rotation shaft; a bearing attached to an inner peripheral surface of the bearing housing and rotatably supporting the rotation shaft; and a first elastic member. A first flow path and a second flow path are formed inside the bearing housing, each of the first flow path and the second flow path extending in a direction of a center axis of the bearing housing. A first groove is formed in an outer peripheral surface of the bearing housing, the first groove extending in a peripheral direction of the bearing housing, the first groove being connected to the first flow path and the second flow path. The first elastic member closes an opening of the first groove.