Handheld Tool Vibration Isolation with Active Damping

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Solution Overview

Problem

Handheld working tools face a compromise between effective vibration isolation and manageability, as soft springs improve isolation but degrade manageability, and existing solutions only slightly enhance manageability at the expense of vibration isolation.

Innovation Solution

A handheld working tool with two types of antivibration elements, where the first type provides soft springs for effective vibration isolation and the second type, with a damping element, activates to prevent vibration transfer to the handle grip, offering improved manageability by mimicking a stiff spring effect when loaded.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If soft spring elements are used in antivibration elements, then vibration isolation between motor part and handle part is improved, but manageability during operation deteriorates

Engineering Contradiction:

Improvevibration isolationVSAvoidmanageability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The antivibration system is segmented into two distinct types of antivibration elements: first type elements with soft spring elements for vibration isolation, and second type elements with damping elements for manageability control. This segmentation allows each element type to specialize in one function, resolving the contradiction between vibration isolation and manageability that plagued the single-element design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the antivibration system are given different local qualities: the first type antivibration elements have soft spring elements optimized for vibration isolation, while the second type antivibration elements have damping elements optimized for manageability. This local differentiation allows the system as a whole to achieve both vibration isolation and good manageability simultaneously.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the antivibration element is made softer to improve vibration isolation, then vibrations in the handle grip are reduced, but the tool becomes difficult to control accurately

Engineering Contradiction:

Improvevibrations in handle gripVSAvoidwork accuracy

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The system segments the antivibration function into two specialized elements: first type elements with soft springs that reduce handle vibrations, and second type elements with damping elements that maintain control accuracy. This segmentation resolves the contradiction between vibration reduction and work accuracy that occurs with single-element designs.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If existing antivibration solutions are implemented, then manageability is slightly improved, but vibration isolation is compromised

Engineering Contradiction:

ImprovemanageabilityVSAvoidvibration isolation

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Rather than using a single antivibration element that compromises vibration isolation for manageability, the invention segments the system into two element types: first type elements that maintain soft spring characteristics for vibration isolation, and second type elements that add damping for manageability without sacrificing the vibration isolation provided by the first type elements.

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 solution maintains good vibration isolation while enhancing manageability during heavy loads, allowing for softer springs in the first type antivibration elements and providing a resilient effect equivalent to a stiff spring, thus improving the tool's overall performance.

Implementation Method 1

an antivibration element (30, 40) mounted between a motor unit (10) and a vibration-insulated unit (20). The antivibration element comprises a spring element (31) attached to one of the two units

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The at least one second type antivibration element (40) is adapted to, when in an active state, prevent vibrations in the motor part from being transferred to the handle grip

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS9016672B2Handheld working tool

Publication Date: 2015.04.28 HUSQVARNA AB

AI summary

The present invention concerns a handheld working tool comprising a motor part (10), a handle part (20) comprising a handle grip (21), and at least one first type antivibration element (30) arranged between said motor part (10) and said handle part (20), and which element (30) is adapted to isolate the handle part (20) from vibrations in the motor part (10). The working tool (1) is characterized in that it further comprises at least one second type antivibration element (40) arranged adjacent to the first type antivibration element (30). The at least one second type antivibration element (40) is adapted to, when in an active state, prevent vibrations in the motor part (10) from being transferred to the handle grip (21). The second antivibration element (40) is in the active state when the handle grip (21) is loaded during operation of the working tool (1). The working tool is further characterized in that a longitudinal axis (L1) of the second type antivibration element (40) is separated from a longitudinal axis (L2) of the first type antivibration element (30).