Stud Bolt Support Structure for Chainsaw Housing Crack Prevention
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Solution Overview
Problem
Chainsaws with long guide bars experience vibrations that can cause cracks in the housing due to the transmission of transverse forces through the threaded connection between the guide bar and the housing, leading to wear and durability issues.
Innovation Solution
A stud bolt design with a support region separated from the threaded connection, where transverse forces are transmitted indirectly or directly through a separate support area, reducing the stress on the inner thread and preventing cracks, while longitudinal forces are transmitted through the threaded connection, minimizing wear and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If transverse forces are transmitted through the threaded connection between the guide bar and housing, then the stud bolt can be securely fastened, but cracks can form in the housing due to vibration-induced stress
Solution Approach 1:
The stud bolt is divided into functionally distinct sections: a first section with outer thread for longitudinal force transmission, and a second section with support region for transverse force transmission. This segmentation separates the force transmission paths, preventing transverse forces from acting on the threaded connection and causing cracks in the housing.
Solution Approach 2:
The support region acts as an intermediary element between the stud bolt and the housing part. It provides an alternative transmission path for transverse forces, mediating the interaction between the guide bar and housing by directing forces away from the vulnerable threaded connection region.
2Force
If the stud bolt is securely fastened with threaded connection, then longitudinal forces can be transmitted, but transverse forces cause wear and cracks in the threaded connection
Solution Approach 1:
The stud bolt is segmented into distinct functional zones: the first section handles longitudinal forces through the outer thread, while the second section handles transverse forces through the support region. This spatial separation of force transmission functions eliminates the harmful interaction between transverse forces and the threaded connection.
Solution Approach 2:
Different sections of the stud bolt are designed with locally optimized properties: the first section has outer thread geometry optimized for longitudinal force transmission, while the second section has support region geometry optimized for transverse force transmission. Each local region is tailored to its specific functional requirement.
Data Source
AI summary
A work apparatus includes a housing part and a stud bolt for fastening a work tool on the housing part. The stud bolt extends along an axial direction and has a first section and a second section in the axial direction. The first section is at least in part arranged in a receptacle of the housing part. The second section protrudes from the housing part in the axial direction. The first section of the stud bolt in a first lower portion thereof has an outer thread which, for transmitting longitudinal forces (L), threadably engages an inner thread of the receptacle to define a threaded connection. The first section for transmitting transverse forces (Q) to the housing part, in a second lower portion thereof, has a support region supported on the receptacle. The support region is disposed at a spacing (a1) from the threaded connection.