Bearing Cooling Structure With Inclined Nozzle for Preload Control
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Solution Overview
Problem
Current bearing devices face challenges in efficiently cooling the inner ring and main shaft while maintaining lubrication, leading to increased temperature and preload, which affects machining accuracy and efficiency.
Innovation Solution
A cooling structure that uses a mixture of air and oil or compressed air, blown through a nozzle with an inclined discharge port, to create a swirling flow that effectively cools the inner ring and main shaft, while also providing lubrication through a combination of air oil and oil mist, reducing noise and maintaining efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air cooling is applied to the bearing, then the bearing temperature is reduced, but the cooling effect is insufficient and the structure becomes complex
Solution Approach 1:
The patent combines air cooling and oil lubrication into a single integrated system. The air-oil mixture is discharged through nozzles to simultaneously achieve cooling and lubrication of the bearing, eliminating the need for separate cooling and lubrication systems while improving cooling effectiveness.
Solution Approach 2:
The patent uses pneumatic principles by introducing compressed air into the lubrication system. The air creates a swirling flow that enhances the distribution of oil mist on the bearing surfaces, improving both cooling and lubrication effectiveness without requiring complex mechanical cooling structures.
2Productivity
If the main shaft speed is increased to improve machining efficiency, then productivity increases, but temperature rise and preload increase affecting machining accuracy
Solution Approach 1:
The patent ensures continuous cooling and lubrication by maintaining a constant flow of air-oil mixture through the bearing. This continuous action prevents temperature accumulation and maintains stable bearing preload, enabling high-speed operation without sacrificing machining accuracy.
Solution Approach 2:
The patent changes the physical state of the lubricant from liquid oil to air-oil mist by introducing compressed air. This parameter change allows the lubricant to be delivered more effectively at high speeds, maintaining lubrication quality and temperature control even when the main shaft operates at higher speeds for improved productivity.
3Object-generated harmful factors
If air oil lubrication is used to reduce noise, then noise level decreases, but the lubrication effectiveness may be compromised
Solution Approach 1:
The patent applies local quality by creating concentrated zones of oil mist at critical bearing contact points through strategically positioned nozzles. The air flow concentrates the lubricant where it is most needed, ensuring effective lubrication while maintaining low noise levels throughout the overall system.
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 proposed solution effectively reduces the temperature of the rolling bearings and main shaft, alleviates preload issues, and enhances machining efficiency and accuracy by stabilizing the cooling fluid flow and lubrication, without the need for expensive equipment.
Implementation Method 1
a mixture of air and oil or compressed air, blown through a nozzle with an inclined discharge port, to create a swirling flow that effectively cools the inner ring and main shaft
Implementation Method 2
The proposed solution effectively reduces the temperature of the rolling bearings and main shaft, alleviates preload issues, and enhances machining efficiency and accuracy by stabilizing the cooling fluid flow and lubrication
Implementation Method 3
providing lubrication through a combination of air oil and oil mist, reducing noise and maintaining efficient cooling
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A bearing device includes an outer ring spacer (4) and an inner ring spacer (5), which are interposed between outer rings of a plurality of axially juxtaposed rolling bearings and inner rings (3) of such rolling bearings, respectively. The outer ring and the outer ring spacer (4) are disposed within a housing (6) while the inner ring (3) and the inner ring spacer (5) are mounted on a main shaft (7). A nozzle (12) is provided in the outer ring spacer (4) for blowing a cooling fluid to an outer peripheral surface of an inner ring (3) or the inner ring spacer (4) to thereby supply the cooling fluid to the rolling bearing. The nozzle (12) is provided with its discharge port side inclined forwardly with respect to the direction of rotation of the main shaft (7).