Pulley Flange Retention Structure for Compact Belt Tensioners
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Solution Overview
Problem
Pulley devices for belt tensioners or winders face challenges in maintaining secure and pollution-resistant assemblies that are easy to mount and transport, with a need for enhanced axial and radial retention, especially when a spacer is included.
Innovation Solution
A pulley device design featuring a bearing with a rotating outer race and a fixed inner race, a protection flange with a radially extending portion that deforms to secure the screw, and a screw with a smooth portion and a threaded portion, where the flange's axial portion transitions from an undeformed to a deformed configuration to lock the screw in place, ensuring axial and radial retention without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spacer is included between the inner race and screw body, then the assembly is more robust and pollution-resistant, but the axial and radial retention of the flange is weakened
Solution Approach 1:
The flange is divided into two functional portions: a radial portion that provides pollution protection and an axial portion that provides retention. The axial portion is segmented into multiple retention elements that can independently engage with the bearing, distributing the retention function across multiple contact points to maintain strong axial and radial retention despite the presence of the spacer.
Solution Approach 2:
The retention mechanism transitions from a purely radial retention approach to a multi-dimensional approach by adding axial retention elements. The axial portion extends in the axial direction and engages with the bearing through circumferential grooves, creating retention in both axial and radial dimensions simultaneously, counteracting the retention weakness introduced by the spacer.
2Volume of stationary object
If the flange is directly fixed to the inner bearing race, then the assembly is compact, but the screw may fall out during transportation
Solution Approach 1:
The axial portion of the flange is pre-configured with retention elements (such as protrusions or engagement features) that are designed to interact with corresponding features on the bearing or screw. This preliminary configuration ensures that when the assembly is put together, the screw is automatically retained axially and radially, preventing it from falling out during transportation without requiring additional retention mechanisms that would increase the axial size.
3Reliability
If the flange includes interior projections for immobilizing the screw, then the screw is secured axially, but the device complexity increases
Solution Approach 1:
The flange is designed to perform multiple functions with a single structure: the radial portion provides pollution protection, the axial portion provides retention, and the integration of these portions creates a multi-functional component. The retention elements on the axial portion simultaneously provide axial and radial retention, eliminating the need for separate retention mechanisms and reducing overall device complexity while maintaining reliable screw immobilization.
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 creates a secure, compact, and easy-to-assemble pulley device that is resistant to pollution and can be easily transported and mounted, with enhanced axial and radial retention, preventing accidental disassembly and ensuring reliable operation.
Implementation Method 1
the axial portion of the flange is configured so that it is able to pass from an undeformed first configuration to a deformed second configuration
Data Source
AI summary
A pulley device for a belt tensioner or winder roller having a bearing, a pulley mounted to the bearing, a protection flange and a screw. The protection flange includes an axial portion that is able to pass from an undeformed first configuration for positioning the flange on the bearing to a deformed second configuration for axial and radial retention of the flange.