Segmented Cylinder Head Rotary Valve Air Flow

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Solution Overview

Problem

Existing cylinder heads with spherical rotary valves face challenges in achieving efficient air flow due to large valve sizes, increased manufacturing costs, and geometric changes from uneven heating, which limit air flow and emission performance.

Innovation Solution

A cylinder head design featuring a single piece main body with integrated valve chambers and flow passages, accommodating two rotary valves per chamber, and a drive mechanism that allows independent control of valve operation, optimizing flow areas and reducing manufacturing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If large spherical rotary valves are used to provide required air flow, then air flow requirement is met, but cylinder head size becomes very large and manufacturing costs increase

Engineering Contradiction:

Improveair flowVSAvoidcylinder head size

Core Design Contradiction:

ProductivityVSVolume of stationary object

Solution Approach 1:

The valve chamber is divided into two separate body portions (upper and lower) that are assembled together. Each portion contains cavities forming half of the spherical valve chambers, allowing the rotary valves to be accommodated in a compact configuration that reduces overall cylinder head size while maintaining required air flow capacity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inlet passages and exhaust passages are formed in different body portions at different spatial orientations. The upper body portion contains inlet passages connecting to an air manifold, while the lower body portion contains exhaust passages connecting to an exhaust manifold, utilizing three-dimensional space efficiently to accommodate all passages without increasing overall head size

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If separate body portions are used to accommodate rotary valves, then valve accommodation is achieved, but manufacturing costs increase due to multiple molds and assembly requirements

Engineering Contradiction:

Improvevalve accommodationVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The cylinder head is divided into two body portions that can be manufactured separately using identical or similar molds, then assembled together. This segmentation allows for standardized manufacturing processes and reduces the need for multiple specialized molds, thereby controlling manufacturing costs while accommodating the rotary valves

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Both body portions are designed with similar cavity structures that can be formed using the same or comparable manufacturing processes. The universal design of the cavities to accommodate spherical rotary valves allows for economies of scale in manufacturing while maintaining the required valve accommodation capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If separate body parts are used to form valve chambers, then valve chamber formation is achieved, but uneven heating causes geometric changes that negatively affect fluid flow

Engineering Contradiction:

Improvevalve chamber formationVSAvoidvalve chamber geometry

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The upper and lower body portions are assembled together with their facing surfaces machined to provide sealing and form complete valve chambers. This combined structure acts as a single thermal unit during operation, reducing uneven heating and geometric changes while maintaining the ability to form proper valve chambers for fluid flow

Inventive Principle:

Principle #5Merging (Combining)

4Ease of manufacture

If body part height is limited, then manufacturing is simplified, but inlet and exhaust passage sizes are restricted affecting maximum air flow

Engineering Contradiction:

Improvebody part manufacturingVSAvoidmaximum air flow

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The inlet and exhaust passages are arranged in different spatial dimensions and orientations within the two body portions. By utilizing vertical stacking and three-dimensional routing, the passages achieve adequate size and flow capacity without increasing the horizontal footprint or overall height of individual body parts beyond manufacturing limits

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS8100102B2Cylinder head for an internal combustion engine

Publication Date: 2012.01.24 PERKINS ENGINES

AI summary

A cylinder head for an internal combustion engine is provided. The cylinder head includes a valve chamber shaped to accommodate at least two rotary valves therein. The cylinder head also includes at least two first passages extending between the valve chamber and an underside of the cylinder head. The cylinder head further includes a flow passage for providing fluid communication between the valve chamber and the exterior of the cylinder head.