Tensioner Assembly With Rotating Bar for Single-Wrench Adjustment
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Solution Overview
Problem
The existing tensioning bar assemblies in agricultural machines, such as combine harvesters, require tedious and time-consuming adjustments that often necessitate the use of multiple wrenches and involve complex access challenges due to their design, which complicates the process of changing spring tension or replacing worn components.
Innovation Solution
A tensioning bar assembly with a longitudinally threaded bar that allows for free axial rotation, featuring an engagement head at the bottom end for easier tool access, enabling adjustments with a single wrench and potentially a power tool, reducing the need for open-end wrenches and simplifying the adjustment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the longitudinal bar is fixed rotationally to the clevis assembly, then the structural stability is improved, but the adjustment complexity increases requiring multiple wrenches and complex access
Solution Approach 1:
The bar is divided into a fixed portion (integrated with clevis assembly) and an adjustable portion (threaded section with locking nut). This segmentation allows the bar to maintain structural stability through the fixed portion while enabling simple adjustment through the threaded portion, eliminating the need for multiple wrenches.
Solution Approach 2:
The bar transitions from a completely fixed design to a dynamic design with a threaded section and locking mechanism. This allows the bar to be both stable during operation and easily adjustable when needed, resolving the contradiction between stability and adjustment complexity.
2Ease of manufacture
If the locking nut is positioned for axial access only, then the manufacturing simplicity is improved, but the ease of operation deteriorates requiring perpendicular access and multiple tools
Solution Approach 1:
The locking mechanism is designed to accept wrenches from multiple dimensional angles. The engagement head and locking nut geometry allow perpendicular access (radial direction) in addition to axial access, transforming a single-dimension adjustment problem into a multi-dimensional solution that improves operator ease.
3Area of stationary object
If the bar requires perpendicular access for wrench application, then the space requirement is reduced, but the accessibility deteriorates in tight spaces
Solution Approach 1:
The locking nut and engagement head are designed with universal accessibility, accepting wrenches from both axial and perpendicular directions. This multi-functional access capability ensures the adjustment mechanism works in both open spaces and tight confined areas, improving accessibility without increasing space requirements.
4Device complexity
If the bar and clevis assembly are unitary, then the device complexity is reduced, but the adjustability deteriorates requiring disassembly for tension changes
Solution Approach 1:
The bar is segmented into a fixed integrated portion with the clevis assembly and an adjustable threaded portion. This segmentation maintains the simplicity of a unitary design for the majority of the structure while providing a localized adjustable section that enables tension changes without complete disassembly.
Solution Approach 2:
The bar design transitions from a static unitary structure to a dynamic hybrid structure that is fixed in most areas but adjustable in the threaded section. This allows the system to maintain low overall complexity while gaining the adaptability to adjust belt tension as needed.
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
This design simplifies the adjustment process by allowing a single wrench to hold the locking nut stationary while a second tool engages the engagement head, facilitating rotational motion of the bar and reducing physical exertion, thus making adjustments quicker and more efficient.
Implementation Method 1
a compression spring 4s... The spring 4s is effectively compressed between the bracket 20 and the locking nuts 5a, 5b... The action of the spring 4s on the top retainer 4t, and thus the bracket 20, acts to 'push' the bottom retainer 4b, and thus the locking nuts 5a, 5b, away from the bracket 20
Data Source
AI summary
A tensioning bar assembly for a tensioning assembly of a drive system of an agricultural machine includes a longitudinal bar having a top end, a bottom end, and a threaded portion. An attachment device is coupled to the top end to attach to a tensioning arm. A compression spring is located around a portion of the longitudinal bar. A first spring retainer engages with and retains a first end of the spring. A first locking nut fits to the threaded portion of the bar and retains the first spring retainer longitudinally in place relative to the bar. The longitudinal bar is rotationally freely coupled to the attachment device to permit free axial rotation of the bar about its longitudinal axis relative to the attachment device, and an engagement head is attached to and located at or proximate the bottom end of the longitudinal bar for engagement with a tool.