Freewheel Clutch Roller Securing via Concertina Leaf Spring
Solution Overview
Problem
Existing wedging roller freewheel clutches are difficult to manufacture efficiently and assemble due to the complexity of securing wedging rollers between races, which leads to challenges in handling and ensuring proper alignment during assembly.
Innovation Solution
A freewheel clutch design featuring wedging rollers between two concentric races, where each roller is individually sprung against a wedging ramp by a repeatedly bent concertina leaf spring, with U-shaped portions and securing extensions that interlock with the cage web to secure the rollers in both radial directions, facilitating precise positioning and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional securing methods are used for wedging rollers, then the structure is simple, but the assembly process is difficult and time-consuming
Solution Approach 1:
The securing portion is integrally joined to the U-shaped portion of the leaf spring, combining two previously separate components into one. This integration simplifies the assembly process by eliminating the need for separate securing operations while maintaining the necessary structural complexity for proper roller retention.
Solution Approach 2:
The leaf spring is divided into distinct functional portions: a U-shaped portion for radial securing, a securing portion for tangential positioning, and an extension for positive interlock. This segmentation allows each portion to be optimized for its specific function while simplifying the overall assembly process.
2Manufacturing precision
If conventional leaf spring attachment is used, then manufacturing is simpler, but the positioning precision of wedging rollers is insufficient
Solution Approach 1:
The extension of the end portion automatically engages with the web through positive interlock during assembly, eliminating the need for separate positioning or adjustment operations. The structure self-secures the wedging roller in the correct position, achieving high positioning precision without complicating the manufacturing process.
Solution Approach 2:
The leaf spring is pre-formed with the specific U-shaped geometry and integrated securing portion that automatically positions the wedging roller correctly upon installation. This preliminary configuration of the spring geometry ensures precise roller positioning is achieved as part of the standard assembly process rather than requiring additional precision operations.
3Reliability
If basic roller retention is used, then the structure is simpler, but the rollers can fall out during assembly and operation
Solution Approach 1:
The securing mechanism operates in multiple dimensions: the U-shaped portion provides radial retention, the securing portion provides tangential positioning, and the extension provides axial positive interlock with the web. This multi-dimensional securing approach ensures comprehensive roller retention without requiring complex additional mechanisms.
Solution Approach 2:
The elastic U-shaped portion is designed to flexibly accommodate the wedging roller before final engagement, preventing impact damage and ensuring smooth retention. The extension is pre-configured to engage with the web, providing beforehand assurance that the roller will be securely retained in both radial directions from the moment of installation.
4Ease of operation
If plastic deformation is required for snap-fit assembly, then assembly is easier, but the manufacturing quality and durability are reduced
Solution Approach 1:
The U-shaped portion is designed with specific elastic parameters that allow it to flexibly engage with the web through elastic deformation rather than plastic deformation. The geometry and material properties are optimized so that the spring can be snapped onto the web reversibly, maintaining high assembly quality and durability while keeping the assembly process simple.
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 allows for precise positioning and secure retention of wedging rollers, simplifying the assembly process and ensuring the freewheel clutch is easy to handle and manufacture, with the leaf springs being snap-fit onto the cage web without plastic deformation, enabling efficient production from metal or plastic materials.
Implementation Method 1
each wedging roller is individually sprung against a wedging ramp by means of a repeatedly bent concertina leaf spring
Implementation Method 2
the leaf spring is held on the web through positive interlock in both radial directions by the U-base on the one hand and by the extension of the end portion on the other hand
Implementation Method 3
An end portion of a U-leg remote from the U-base is bent off from the U-leg otherwise running in a radial direction, in such a way as to form a second securing portion, which limits the mobility of the wedging roller in the radial direction opposed to the first radial direction
Data Source
AI summary
A freewheel clutch which has rollers arranged between an inner and outer ring. One of the rings has ramps that interact with the rollers. Each roller is spring-loaded against a ramp by a leaf spring. Each spring is held on a web of a cage by a U-shaped section that encompasses the web. The spring has a securing section connected to the U-shaped section that extends tangentially, limits mobility of a roller in a first radial direction, and is connected to a U-bottom of the U-shaped section. An end section of a U-leg facing away from the U-bottom is bent from the U-leg, forming a second securing section, which limits mobility of the roller in the second radial direction. An extension of the end section facing the U-bottom engages the web such that the spring is held on the web radially by the U-bottom and extension of the end section.