Roller Finger Follower Connection Geometry for Load Dispersion
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Solution Overview
Problem
Conventional roller finger followers in internal combustion engines face durability issues and fatigue failure due to inadequate load dispersion between the body and pallet portions, leading to inefficient valve operation and increased maintenance costs.
Innovation Solution
A vehicle roller finger follower design featuring a main body with a supporting portion, a wall portion, and a pallet portion, where the connection portion is formed with a cross-sectional shape that extends and inclines to efficiently disperse loads, increasing the contact area and reducing fatigue failure, while maintaining the cost-effectiveness of the stamping manufacturing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cross-section between body portion and pallet portion is kept small to reduce material and manufacturing complexity, then manufacturing cost and simplicity are improved, but load dispersion capability deteriorates leading to durability deterioration and fatigue failure
Solution Approach 1:
The connection portion is designed with a three-dimensional structure including an inclined surface that extends in the width direction and connects to the pallet portion. This dimensional approach increases the effective contact area and load-bearing cross-section without complicating the stamping manufacturing process, thereby improving load dispersion and durability while maintaining manufacturing simplicity
Solution Approach 2:
The connection portion is strategically designed with enhanced local geometry at the critical interface between body and pallet portions. The inclined surface and extended width create a locally reinforced zone that specifically addresses load dispersion needs at the connection point without increasing the overall complexity of the entire follower component
2Reliability
If the connection portion is enlarged to improve load dispersion, then durability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of uniformly enlarging the connection portion in all directions, the design utilizes the width direction dimension by extending the connection portion laterally and incorporating an inclined surface. This dimensional approach increases load-bearing area without proportionally increasing overall structural complexity or material usage
Solution Approach 2:
The connection portion geometry is optimized by adjusting specific parameters such as the inclination angle of the surface and the width extension dimensions. These parameter changes enable effective load dispersion while controlling the overall structural complexity and maintaining compatibility with stamping manufacturing constraints
Data Source
AI summary
A vehicle roller finger follower may include a main body including a supporting portion and a wall portion having one end portion integrally extending in a width direction of the supporting portion at both sides; and a pallet portion formed toward an outside in the width direction of the main body at the other end portion of the wall portion, wherein the wall portion has a mounting hole to mount a bearing, and a connection portion is formed at a lower portion of the wall portion at a position corresponding to the mounting hole.