Deformable Knife Holder for Counterknife Shaft Stability
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Solution Overview
Problem
Existing knife holders in counterknife assemblies of combine harvesters are prone to inadvertent movement relative to the common shaft, leading to inefficiencies and potential damage during operation.
Innovation Solution
A knife holder design featuring a body with deformable legs that compressively contact the shaft, preventing inadvertent movement by creating a solid bolt joint through a deformation fit, ensuring stable mounting and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rigid mounting methods are used to fix knife holders to the shaft, then the mounting appears stable, but the knife holders are prone to inadvertent movement and potential damage during operation
Solution Approach 1:
The patent changes the physical state of the knife holder legs from rigid to deformable by applying compressive force through the fastening mechanism. This parameter change allows the legs to elastically deform and conform to the shaft surface, creating a reliable mounting that prevents inadvertent movement while accommodating manufacturing tolerances and operational stresses
2Manufacturing precision
If tight tolerances are specified for knife holder manufacturing to prevent movement, then mounting precision improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent utilizes elastic deformation of the knife holder legs to compensate for manufacturing tolerances. By designing the legs with appropriate material properties and geometric dimensions, the system achieves a precise fit and reliable mounting without requiring extremely tight manufacturing tolerances, thereby simplifying the manufacturing process
Solution Approach 2:
The deformable leg design inherently cushions against misalignment and tolerance variations before they can cause movement or damage. The elastic deformation acts as a built-in compensation mechanism that absorbs dimensional variations, eliminating the need for overly precise manufacturing while maintaining mounting reliability
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 effectively prevents unintended movement of knife holders, enhancing operational stability and durability by allowing for larger manufacturing tolerances and improved load transfer.
Implementation Method 1
an opening for receiving a fastener for mounting the body to the shaft such that fastening the body to the shaft causes the legs to deform and compressively contact the shaft
Data Source
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AI summary
A knife holder for a knife bank of an agricultural vehicle. The knife holder includes a body having opposing legs separated by a channel, wherein the channel is sized for receiving a shaft to which the knife holder is mounted; a mount for mounting the body to a knife element; and an opening for receiving a fastener for mounting the body to the shaft such that fastening the body to the shaft causes the legs to deform and compressively contact the shaft and thereby either prevent or limit inadvertent movement of the body relative to the shaft in a direction that is normal to a longitudinal axis of the shaft.