Pulley Bearing Shield Structure for Pollution-Resistant Assembly
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Solution Overview
Problem
Existing pulley devices face challenges in high-pollution environments due to the risk of pollution intrusion, which can lead to accelerated deterioration of internal components and reduced operational life, and require precise manufacturing tolerances for effective assembly.
Innovation Solution
A pulley device design featuring a freely mounted sleeve within the inner ring bore with an annular protection shield that forms a radial space between coaxial rings, providing axial retention and protection against pollution, while allowing for less precise manufacturing tolerances and reduced axial and radial spatial requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid connection between sleeve and inner ring is implemented to prevent relative movement, then the structural stability is improved, but the manufacturing precision requirements increase significantly
Solution Approach 1:
The patent transitions from a rigid fixed connection to a dynamic adjustable connection. The sleeve is freely mounted in the inner ring bore with radial clearance, allowing relative movement. The adjustment mechanism enables the sleeve position to be dynamically adjusted and locked, providing structural stability without requiring high manufacturing precision.
Solution Approach 2:
The patent changes the connection parameter from fixed/rigid to adjustable/movable. By introducing radial clearance and an adjustment mechanism, the system can adapt to manufacturing tolerances while maintaining operational stability through the locking mechanism.
2Object-affected harmful factors
If sealing means are added to protect against pollution, then the protection capability is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the sealing function from a separate component and integrates it into the adjustment mechanism itself. The adjustment mechanism serves dual purposes: positioning the sleeve and providing sealing against pollution, thereby reducing overall device complexity while maintaining protection capability.
Solution Approach 2:
The adjustment mechanism is designed to perform multiple functions simultaneously: axial adjustment of the sleeve, radial positioning, and sealing against pollution. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure.
3Stability of the object's composition
If precise manufacturing tolerances are required for sleeve and bore, then the assembly stability is improved, but the manufacturing cost and time increase
Solution Approach 1:
The patent employs a dynamic adjustment mechanism that compensates for manufacturing tolerances. The sleeve can be adjusted axially and radially within the inner ring bore, allowing assembly without high precision while maintaining operational stability through the locking mechanism.
Solution Approach 2:
The adjustment mechanism acts as an intermediary between the sleeve and the inner ring bore. It absorbs the manufacturing tolerance variations and provides a stable connection, eliminating the need for high-precision manufacturing of the bore and sleeve interface.
Data Source
AI summary
A pulley device for a transmission element having a pulley, a bearing, and at least one sleeve mounted freely in the bore of the inner ring of the bearing. The pulley device includes at least one annular protection shield, the shield retained axially in a first element from the pulley and coming into immediate proximity with the other element, the other element having at least one shoulder projecting radially ensuring that it is axially retained with the shield.