Rotary Engine Removable Insert for Inspection Access

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Solution Overview

Problem

Rotary engines, such as Wankel engines, pose challenges in inspection and maintenance due to the complexity of their design, requiring substantial disassembly to access critical regions for combustion, which is time-consuming and costly.

Innovation Solution

A rotary engine design featuring a removable insert with a subchamber and coolant passages, allowing for visual inspection and maintenance through an insert opening, facilitating the inspection and repair of internal cavities without extensive disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rotary engines use a sealed internal cavity design, then sealing performance and combustion efficiency are improved, but inspection difficulty and maintenance complexity increase

Engineering Contradiction:

Improvesealing performanceVSAvoidinspection difficulty

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The peripheral wall is segmented into a fixed portion and a removable insert portion. The insert can be detached to provide access to the internal cavity for inspection and maintenance, while the fixed portion maintains the sealing structure during operation. This segmentation allows the engine to achieve both good sealing performance during operation and easy inspection when the insert is removed.

Inventive Principle:

Principle #1Segmentation

2Reliability

If rotary engines require substantial disassembly for inspection, then internal cavity sealing is maintained, but maintenance time and cost increase

Engineering Contradiction:

Improveinternal cavity sealingVSAvoidmaintenance time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The insert containing the subchamber is extracted from the peripheral wall as a separate removable component. This allows direct access to the internal cavity through the insert opening without requiring disassembly of the entire engine or disruption of the main sealing structure. The insert can be quickly removed and reinstalled, significantly reducing maintenance time while preserving internal cavity sealing.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If rotary engines have complex sealed structures, then combustion efficiency is improved, but ease of repair deteriorates

Engineering Contradiction:

Improvecombustion efficiencyVSAvoidease of repair

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The complex sealed structure is divided into modular components, with the insert being a self-contained module that can be removed independently. This segmentation allows repair personnel to access and repair specific components within the insert without having to disassemble the entire engine, significantly improving ease of repair while maintaining the complex sealed structure needed for combustion efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insert is designed as a replaceable component that can be removed, inspected, repaired, or replaced as needed. This approach allows for easy recovery and reuse of functional components while discarding only the specific insert that requires maintenance, rather than requiring replacement or repair of the entire engine structure.

Inventive Principle:

Principle #34Discarding and recovering

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

Enables easier and more cost-effective inspection and maintenance by providing direct access to internal components, reducing downtime and improving diagnostic efficiency.

Implementation Method 1

a plurality of coolant passages defined through the peripheral wall in proximity of the insert opening, the coolant passages forming part of a cooling circuitry for circulating a liquid coolant therethrough

Methodology Applied

Scientific EffectCooling: Cooling

Implementation Method 2

a rotor body rotatable within the internal cavity in sealing engagement with the peripheral wall and defining at least one chamber of variable volume in the internal cavity around the rotor body

Methodology Applied

Scientific EffectRotation:

Implementation Method 3

an insert removably received in the insert opening of the peripheral wall... performing an unaided visual inspection of the internal cavity through the insert opening

Methodology Applied

Scientific EffectPhysical access through opening:

Data Source

PatentUS11028768B2Rotary internal combustion engine with removable subchamber insert

Publication Date: 2021.06.08 PRATT & WHITNEY CANADA CORP

AI summary

A rotary engine having an outer body having an internal cavity with a peripheral wall having an insert opening defined therethrough in communication with the internal cavity, and a plurality of coolant passages defined through the peripheral wall in proximity of the insert opening, a rotor body rotatable within the internal cavity, and an insert removably received in the insert opening of the peripheral wall, the insert having a subchamber defined therein communicating with the internal cavity, with a minimum width of the insert opening being at least 0.75 inches. An outer body for a rotary engine and a method of inspecting in an internal cavity in an outer body of a rotary engine are also discussed; also, a rotary engine including a fuel injector having a tip received in the injector hole of the peripheral wall without protruding in the insert opening.