Engine Mounting Structure Vibration Isolation

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Solution Overview

Problem

Existing walk-behind work machines with mounted engines face challenges in reducing vibration transmission to the operating handle, relying on anti-vibration rubber which deteriorates over time.

Innovation Solution

The implementation of a high-rigidity mounting part at the most rigid location on the work-machine body, where the engine is loosely joined using a bolt and a restricting member, such as a collar, to minimize vibration transmission without relying on anti-vibration rubber.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If anti-vibration rubber is used to reduce vibration transmission to the operating handle, then vibration reduction is achieved, but the rubber deteriorates over time and must be replaced

Engineering Contradiction:

Improvevibration transmission to operating handleVSAvoidservice life of anti-vibration rubber

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent removes the anti-vibration rubber component from the engine mounting system entirely. Instead of using rubber mounts, the engine is directly joined to rigid mounting parts on the work-machine body, eliminating the component that deteriorates over time while maintaining vibration reduction through structural design

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical vibration isolation system (anti-vibration rubber) with a structural configuration where the engine is mounted on rigid parts positioned at maximally rigid locations of the work-machine body, using the inherent rigidity and geometry of the mounting structure to control vibration transmission

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the engine is securely joined to all mounting parts, then structural stability is improved, but vibration transmission to the operating handle increases

Engineering Contradiction:

Improvestructural stability of engine mountingVSAvoidvibration transmission to operating handle

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent applies different joining characteristics to different mounting parts. The engine is securely joined to mounting parts at non-maximally rigid locations while being loosely joined to mounting parts at maximally rigid locations, creating local variations in joining rigidity that reduce overall vibration transmission while maintaining structural stability

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8215090B2Walk behind work machine having an engine mounting structure

Publication Date: 2012.07.10 HONDA MOTOR CO LTD

AI summary

A walk-behind work machine in which vibration produced by the driving of an engine is not readily transmitted to an operating handle. The work machine includes a work-machine body having a plurality of mounting parts to which an engine is joined. The mounting parts include a high-rigidity mounting part positioned at a maximally rigid part on the work-machine body, and other mounting parts exclusive of the high-rigidity mounting part. The engine is joined securely to the other mounting parts and is joined more loosely to the high-rigidity mounting part than to the other mounting parts.