Chain Guide Shoe Base Groove Thermal Expansion

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Solution Overview

Problem

Conventional chain guides face durability issues due to thermal expansion and contraction, and limited lateral movement restriction, leading to potential shoe damage and instability in varying temperatures, as well as restricted base types without guide side walls.

Innovation Solution

A chain guide design featuring a shoe with a protruding strip engaging a base groove, allowing for longitudinal movement and restricting both directional movements, enhancing rigidity and durability while improving engagement capabilities and heat radiation without increasing size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the shoe is made movable in the longitudinal direction to absorb thermal expansion and contraction, then the durability of the shoe is improved, but the lateral movement restriction capability is reduced

Engineering Contradiction:

Improvedurability of shoeVSAvoidlateral movement restriction

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The engagement portion is divided into a movable engagement portion and a fixed engagement portion. The movable engagement portion allows longitudinal movement to absorb thermal expansion and contraction, while the fixed engagement portion maintains lateral movement restriction. This segmentation enables the shoe to simultaneously achieve durability through longitudinal movability and stability through lateral constraint.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If guide side walls are added to the base to restrict lateral movement of the shoe, then the stability of the shoe is improved, but the type of base that can be used is limited

Engineering Contradiction:

Improvelateral movement restrictionVSAvoidtype of base

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The engagement portion is segmented into movable and fixed parts, where the fixed engagement portion integrates the lateral movement restriction function that would otherwise require separate guide side walls. This allows the shoe to be used with bases that do not have guide side walls, increasing base type compatibility while maintaining lateral stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixed engagement portion serves multiple functions: it restricts lateral movement of the shoe and provides a stable mounting point on the base. By integrating these functions into the engagement portion itself, the design becomes universal and can be applied to various base types without requiring specific base features like guide side walls.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Stability of the object's composition

If the shoe is restricted in longitudinal direction to prevent lateral movement, then the lateral stability is improved, but thermal expansion and contraction cause tensile load and potential damage

Engineering Contradiction:

Improvelateral movement restrictionVSAvoidtensile load on shoe

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The engagement portion is divided into movable and fixed sections. The movable engagement portion specifically allows longitudinal movement while the fixed engagement portion maintains lateral restriction. This segmentation enables the shoe to expand and contract longitudinally without generating excessive tensile loads, while still preventing lateral movement through the fixed portion.

Inventive Principle:

Principle #1Segmentation

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

The design prevents durability reduction, restricts lateral movement, and enhances the engagement between the shoe and base, improving stability and allowing assembly without guide side walls, thus increasing the types of bases that can be used.

Implementation Method 1

a shoe with which a chain traveling in a traveling direction is in sliding contact

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the shoe protruding strip is engaged with the base groove

Methodology Applied

Scientific EffectMechanical Fastener: Mechanical Fastener

Implementation Method 3

the shoe expands or contracts in a longitudinal direction of the guide relative to the base due to a difference in thermal expansion/contraction amount

Methodology Applied

Scientific EffectThermal Expansion: Thermal Expansion

Data Source

PatentUS9279481B2Chain guide

Publication Date: 2016.03.08 TSUBAKIMOTO CHAIN CO

AI summary

There is provided a chain guide capable of preventing a reduction in the durability of the chain guide. In the chain guide in which a base and a shoe are assembled together, a shoe protruding strip formed on a back surface of the shoe is engaged with a base groove that is formed in the base and continuously extends in a longitudinal direction so as to be movable in the longitudinal direction with respect to the base when the shoe expands or contracts, and be able to restrict the movement of the shoe in first and second width directions.