Straight Rocker Shaft Engine Assembly

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Solution Overview

Problem

The existing rocker shafts in internal combustion engine systems, particularly those with a bent uniform oval cross-section, are challenging to repair or replace due to manufacturing difficulties and variability in produced parts, and supporting these shafts with rocker pedestals of varying pillar heights is complex.

Innovation Solution

A system featuring a straight rocker shaft passing through differently shaped first and second rocker arms, with a rocker pedestal having pillars of equal height to support the shaft, allowing for improved manufacturability and reduced component complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a bent rocker shaft with uniform oval cross-section is used, then the shaft can pass through the openings of rocker arms, but the manufacturing becomes challenging and part variability increases

Engineering Contradiction:

Improverocker shaft manufacturabilityVSAvoidrocker shaft dimensional consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Instead of bending a straight shaft to fit the rocker arm openings, the invention inverts the approach by making the rocker shaft straight and adapting the rocker arm openings to accommodate it. This reversal of the design paradigm eliminates the manufacturing complexity of bending operations while maintaining the functional requirement of the shaft passing through both rocker arm openings.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention changes the geometric parameters of the rocker shaft from a bent configuration with uniform oval cross-section to a straight shaft with potentially varying cross-sectional dimensions. This parameter change simplifies manufacturing by eliminating bending operations and allows for more consistent dimensional control during production.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a bent rocker shaft is used, then it can connect the rocker arms, but the rocker pedestal requires pillars of varying heights increasing complexity

Engineering Contradiction:

Improverocker pedestal structureVSAvoidrocker pedestal manufacturing

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The invention applies equipotentiality by making all pillars of the rocker pedestal equal in height, creating a uniform support structure. This eliminates the need for varying pillar heights that would be required to support a bent shaft, thereby simplifying the rocker pedestal design and manufacturing while maintaining proper support for the straight rocker shaft.

Inventive Principle:

Principle #12Equipotentiality

3Device complexity

If a straight rocker shaft is used, then manufacturability improves and component complexity reduces, but the rocker arms must be shaped differently

Engineering Contradiction:

Improveoverall system complexityVSAvoidrocker arm geometry

Core Design Contradiction:

Device complexityVSShape

Solution Approach 1:

The invention applies local quality by allowing each rocker arm to have different geometries and opening configurations tailored to its specific location and function. Instead of requiring identical rocker arms with a bent shaft, each arm can be optimized locally with appropriate shapes that accommodate the straight shaft while maintaining their individual functional requirements.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11236644B1System and method for rocker assembly

Publication Date: 2022.02.01 POWERHOUSE ENGINE SOLUTIONS SWITZERLAND IP HLDG GMBH

AI summary

Systems and methods for an engine are provided. The engine includes a straight rocker shaft passing through each of a first rocker arm and a second rocker arm, the first rocker arm being shaped differently from the second rocker arm.