Lightweight Chainsaw Guide Bar With Bonded Inserts for Stiffness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lightweight guide bars for handheld chainsaws face challenges in achieving both durability and comfort for operators, as they tend to compromise on either weight reduction or toughness for extended use.
Innovation Solution
A guide bar design featuring a core plate with a plurality of apertures and side plates with elongated openings, where plastic inserts are used to maintain stiffness and strength while reducing weight, and adhesive is applied to secure the inserts and enhance bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid side plates and core plate are used, then strength and durability are improved, but weight increases
Solution Approach 1:
The guide bar is segmented into a metal frame structure with side plates and core plate, creating a skeletal framework that maintains strength while reducing weight. The frame structure divides the solid mass into strategic load-bearing elements.
Solution Approach 2:
The core plate incorporates an aperture arrangement with multiple holes, creating a porous structure that significantly reduces weight while maintaining structural integrity. The apertures remove unnecessary material from low-stress areas.
Solution Approach 3:
The guide bar combines metal (side plates and core plate) with plastic inserts, creating a composite structure that leverages the strength of metal and the weight-saving properties of plastic material.
2Weight of moving object
If apertures are introduced in the core plate, then weight is reduced, but stiffness may deteriorate
Solution Approach 1:
The core plate is segmented with strategically positioned apertures that remove material from areas where it provides minimal structural benefit, while retaining stiffness in critical load-bearing regions.
Solution Approach 2:
The aperture arrangement is designed with varying aperture sizes and distributions to maintain local stiffness where needed while reducing weight in less critical areas. The plastic inserts are positioned to reinforce specific regions.
3Weight of moving object
If plastic inserts are used in openings, then weight is reduced, but risk of detachment increases
Solution Approach 1:
Adhesive is applied beforehand to the plastic inserts or metal frame to prevent detachment during operation. This preparatory bonding action ensures reliable retention before the guide bar is subjected to operational stresses.
Solution Approach 2:
The combination of metal frame and plastic inserts creates a composite structure where adhesive bonding ensures reliable integration between the two materials, preventing detachment while maintaining weight reduction benefits.
Data Source
AI summary
This disclosure relates to a guide bar for a handheld chainsaw. The guide bar comprises first side plate, a second side plate and a core plate, wherein the core plate is arranged between the first side plate and the second side plate providing the guide bar extending in a guide bar plane along a longitudinal direction. Each side plate is provided with a respective opening arrangement, each arrangement comprising at least one elongated opening extending in the longitudinal direction of the guide bar and fully through each side plate. The core plate is provided with an aperture arrangement, comprising a plurality of apertures, each extending fully trough the core plate. Each of the at least one elongated opening is provided with a respective plastic insert. The disclosure also relates to a method of manufacturing of a guide bar.