Arched Key Portion for Pulser Plate Positioning
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Solution Overview
Problem
Conventional pulser plate mounting structures face challenges in achieving high precision and productivity due to low rigidity and complex machining requirements, particularly with L-shaped key portions that are cantilever-supported and require finishing processes like chamfering.
Innovation Solution
A pulser plate mounting structure featuring an arched band-shaped key portion that engages with a key groove on the crankshaft, providing double support and eliminating the need for finishing processes, along with a rib and boss configuration that enhances rigidity and durability, and a design that allows for easy press-forming and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an L-shaped bent portion is used as the key portion, then the structure is simple to form, but the rigidity is low and positioning precision is poor
Solution Approach 1:
The key portion is formed as an arched band-shaped portion with a curved arch shape instead of a straight L-shaped bent portion. This curvature provides structural rigidity while maintaining ease of formation through press-working, resolving the contradiction between simple formation and positioning precision.
Solution Approach 2:
The key portion transitions from a two-dimensional L-shaped bent portion to a three-dimensional arched band-shaped portion with height dimension. This adds structural rigidity in the vertical direction while the band shape provides lateral stability, improving positioning precision without complicating manufacturing.
2Device complexity
If an L-shaped bent portion is used as the key portion, then the structure is simple, but additional finishing processes like chamfering are required
Solution Approach 1:
The arched band-shaped key portion is designed to self-form during press-working without requiring subsequent finishing operations. The arch shape naturally provides the necessary geometric features, eliminating the need for separate chamfering processes and improving productivity.
Solution Approach 2:
The key portion geometry is optimized through parameter changes in the press-forming process, where the arch shape and band dimensions are controlled to achieve the desired structural properties in a single forming operation, eliminating multiple machining steps.
3Ease of manufacture
If the key portion is cantilever-supported, then the structure is simple to fabricate, but the rigidity is insufficient
Solution Approach 1:
The arched configuration of the band-shaped key portion provides inherent structural rigidity through its curved geometry, eliminating the need for cantilever support while maintaining ease of fabrication through press-forming operations.
Solution Approach 2:
The key portion is segmented into a band-shaped structure with defined width and thickness, providing distributed structural support rather than a single cantilever element. This segmentation enhances rigidity while keeping the fabrication process simple.
Data Source
AI summary
A pulser plate mounting structure is provided in which a key groove (14) is formed in a mounting face (10) of a rotating wall portion (9) formed from a crank arm (3) and a counterweight (4), a key portion (16) for engaging with the key groove (14) is formed on a pulser plate (P) that is superimposed on the mounting face (10), and this pulser plate (P) is secured to the rotating wall portion (9) by means of a securing member (18), wherein the key portion (16) is formed from an arched band-shaped portion (16a) projecting in an arched shape from the pulser plate (P) on one end face side thereof and engaging with the key groove (14), and a pair of connecting portions (16b) for providing integral connection between the pulser plate (P) and opposite ends of the arched band-shaped portion (16a). This provides a high precision of positioning of the pulser plate relative to the crankshaft and a good productivity for the pulser plate.