Front Loader Operation Mechanism for Neutral Backlash Reduction
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Solution Overview
Problem
The existing operation mechanisms for front loaders in tractors are prone to backlash due to gaps between wires, leading to unintentional movement of the operation lever near the neutral position during vehicle travel, especially under vibration conditions.
Innovation Solution
An operation mechanism with a restriction mechanism that includes a moving member connected to a control valve and a biasing member to restrict movement at the neutral position, using an abutment member and a biasing mechanism to prevent backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a push-pull wire mechanism is used to connect the operation lever and control valve, then the operation mechanism can be operated remotely, but gaps between the inner wire and outer wire cause backlash that prevents spool displacement until the lever is operated by a predetermined amount
Solution Approach 1:
A moving member is introduced as an intermediary component between the push-pull wire and the control valve spool. This moving member includes a spool receiving portion that directly receives the spool, eliminating the gap problem caused by the push-pull wire mechanism. The moving member translates the lever operation into direct spool displacement without the backlash issues of the wire mechanism.
Solution Approach 2:
The operation mechanism is divided into distinct functional segments: the operation lever, the push-pull wire mechanism for remote operation, and the moving member with spool receiving portion for precise spool control. This segmentation allows each component to perform its specific function optimally while reducing the overall backlash effect.
2Measurement precision
If the operation lever is operated near the neutral position during vehicle traveling, then the operator can make precise adjustments, but vibration causes the lever to move unintentionally due to existing backlash
Solution Approach 1:
The moving member with spool receiving portion is designed to preemptively counteract the vibration-induced movements by providing a rigid connection that prevents the spool from moving when the lever is near the neutral position. The direct receiving structure eliminates the gap that would otherwise allow vibration to cause unintentional spool displacement.
3Reliability
If a restriction mechanism is added to prevent backlash, then operational stability is improved, but the device complexity increases
Solution Approach 1:
The restriction function is merged into the moving member itself through the spool receiving portion design. Rather than adding a separate restriction mechanism, the moving member's structure inherently restricts spool movement when the lever is near the neutral position, combining the positioning and restriction functions in a single component.
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 mechanism effectively reduces backlash in both left-right and front-rear directions, maintaining operational stability and reducing the operation load, while allowing easy installation and adjustment.
Implementation Method 1
a biasing member configured to bias the abutment member toward the moving member
Data Source
AI summary
Provided are an operation lever, a moving pin movable in a front-rear direction and a left-right direction according to an operation of the operation lever and connected to a control valve, and a restriction mechanism configured to restrict movement of the moving pin in a state where the operation lever is operated to a neutral position. The restriction mechanism includes a ball capable of abutting on a surface of the moving pin, and a spring configured to bias the ball toward the moving pin.