Heatable Toroidal Bearing Test Bench Friction Control
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Solution Overview
Problem
The influence of bearing friction on measurement accuracy in roller test stands is significant, particularly due to temperature changes and static friction, leading to inaccurate and unreliable results, which are compounded by the need for lengthy warming periods to stabilize the system.
Innovation Solution
The use of a heatable toroidal bearing as the floating bearing, combined with a fixed bearing, allows for axial compensation without overcoming static friction, and the implementation of uniformly distributed heating elements around the bearing support devices to quickly achieve a stable working temperature, minimizing friction-related errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pillow block bearing is used with a free-running tolerance to allow axial displacement, then the bearing can accommodate axial movement, but the static friction must be overcome causing sudden slipping and falsifying measurement results
Solution Approach 1:
The patent changes the friction parameter by heating the bearing to a predetermined temperature, reducing static friction and preventing sudden slipping that would falsify measurement results
Solution Approach 2:
The bearing is pre-heated to a predetermined temperature before measurements are taken, eliminating the need to overcome high static friction during actual measurements and preventing sudden slipping
2Reliability
If the test stand is warmed up over a longer period to minimize bearing friction interference, then measurement reliability improves, but testing time increases significantly
Solution Approach 1:
The bearing is pre-heated to a predetermined temperature before measurements are taken, eliminating the need for lengthy warm-up periods and allowing immediate reliable measurements
Solution Approach 2:
The temperature parameter of the bearing is actively controlled and raised to a predetermined level, changing the friction characteristics to ensure reliable measurements without time-consuming warm-up periods
3Measurement precision
If heating elements are applied to the bearing to reduce friction, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The bearing support device serves multiple functions: it provides mechanical support for the drive shaft and simultaneously houses heating elements for temperature control, eliminating the need for separate heating apparatus
Solution Approach 2:
The heating elements are integrated directly into the bearing support device structure, combining the support function with the heating function in a single unified component
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 configuration significantly reduces the impact of friction on measurement accuracy, enabling faster and more reliable testing by preventing sudden slipping and maintaining consistent temperature across the bearing system, thus improving the overall precision of the test stand.
Implementation Method 1
At least one bearing support device (4, 5) has a heating device (9, 10) for heating the bearing support device (4, 5) as a whole or in parts to a predetermined temperature
Data Source
Figure 1a~1b
Figure 2~3
Figure 4~5
AI summary
The invention relates to a test bench with a motor (1) and a drive shaft (2) connected to said motor. At least one drum (3) that can be rotatably driven by the drive shaft (2) is also provided, together with a bearing device (4, 5) that supports the drive shaft (2). The bearing device has a fixed bearing (4) and a movable bearing (5) located at a distance from the fixed bearing. The movable bearing (5) is a toroidal bearing. A pedestal bearing housing (6) that receives the bearing can be heated with the aid of six heating elements (10) distributed around the periphery.