Accelerator Cable Sheath Blocking System for Engine Precision

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Solution Overview

Problem

Existing systems for remotely activating components in small internal combustion engines, such as the carburettor butterfly valve, face imprecision due to inadequate blocking of the cable sheath ends, leading to compromised engine functionality.

Innovation Solution

A blocking and adjusting system for the command cable sheath near the commanded organ, utilizing a vice mechanism with a knurled adjusting roller and screws to securely fix the sheath in place, ensuring precise transmission of commands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the sheath ends are solidly blocked at both ends, then the precision of command transmission is improved, but the device complexity increases due to additional blocking mechanisms

Engineering Contradiction:

Improveprecision of command transmissionVSAvoidcomplexity of blocking mechanisms

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the blocking function from both ends of the sheath and concentrates it at only one end (the end closer to the commanded organ). This eliminates the need for complex blocking mechanisms at both ends while maintaining command transmission precision, as the single blocked end is sufficient to prevent sheath displacement.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent incorporates a adjustment mechanism that allows the blocked end of the sheath to be preliminarily adjusted to the correct position before final blocking. This preliminary positioning action ensures precise command transmission while simplifying the overall blocking system, as the adjustment is performed once during installation rather than requiring complex continuous adjustment mechanisms.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If the sheath is fixedly blocked at the end closer to the command lever, then the sheath stability is improved, but the command precision deteriorates due to potential sheath drawing over a tract

Engineering Contradiction:

Improvestability of sheath positionVSAvoidprecision of command transmission

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent inverts the conventional approach by blocking the sheath at the end closer to the commanded organ rather than at the end closer to the command lever. This inversion prevents the command lever from drawing the sheath over a tract, as the blocked end is now at the opposite side, thereby maintaining both sheath stability and command precision.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If a simple blocking mechanism is used, then the device complexity is reduced, but the manufacturing precision of sheath positioning deteriorates

Engineering Contradiction:

Improvesimplicity of blocking systemVSAvoidpositioning precision of sheath end

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

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

This solution ensures precise transmission of commands, preventing undesired sheath displacement and maintaining regular engine operation by securely fixing the sheath end near the commanded organ, thereby enhancing the reliability and precision of the engine's functioning.

Implementation Method 1

a knurled adjusting roller located in contact with the sheath and having an axis which is perpendicular to the axis of the sheath

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP2369157B1An adjustment and blocking system of an accelerator cable

Publication Date: 2012.12.12 EMAK

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AI summary

An adjustment and blocking system of an accelerator cable of an internal combustion engine of a portable work machine comprising the engine, a tubular frame joining the engine with the tool, and a handle located in proximity of the engine and gripped by an operator, the handle comprising a command lever of a commanded organ of the engine, the lever being connected to the commanded organ via a sheathed cable, near to the commanded organ the sheath of the sheathed cable being connected to the engine casing, and the cable being connected to the commanded organ, characterised in that the casing of the engine comprises connecting means for blocking the end of the sheath of the cable to the engine casing while adjusting its position with respect to the engine casing.