Tractor Brake Pedal Spring Mounting Away From the Master Cylinder
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Solution Overview
Problem
Conventional tractors face challenges in maintaining a simple structure for engaging the return spring of the brake pedal while ensuring it does not extend to the master cylinder side, which can complicate assembly and reduce the space available for the footwell.
Innovation Solution
The return spring is engaged to a partition member positioned further towards the vehicle-body front side than the brake pedal, using a torsion coil spring supported by the support shaft, with the coil portion engaging the shaft, and the arms of the spring engaging with the partition member and pedal arm portion, allowing for a stable biasing force without additional support members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the return spring is engaged to the cylinder case on the master-cylinder side, then the brake pedal can be biased to the off position, but the return spring extends to the master-cylinder side complicating the structure and reducing footwell space
Solution Approach 1:
The return spring engagement point is extracted from the master cylinder side and relocated to the partition member on the driver side. This separates the return spring's engagement structure from the master cylinder assembly, simplifying both the brake system and the partition structure while maintaining the brake pedal return function.
Solution Approach 2:
The partition member serves as an intermediary structure that provides the engagement point for the return spring. Instead of directly engaging the return spring to the master cylinder case, the partition member acts as a mediator that simplifies the engagement structure and increases footwell space.
2Ease of manufacture
If the master cylinder is positioned on the vehicle-body back side of the support shaft, then the brake system layout is optimized, but the return spring must extend across the support shaft area increasing structural complexity
Solution Approach 1:
The return spring engagement point is extracted from the master cylinder side and relocated to the partition member. This allows the master cylinder to be positioned on the vehicle-body back side for optimized brake system layout without requiring the return spring to extend across the support shaft area, as the spring now engages forward at the partition member.
3Area of stationary object
If the partition member is positioned further toward the vehicle-body front side than the support shaft, then footwell space is expanded, but the return spring engagement point moves forward requiring reconfiguration
Solution Approach 1:
The partition member serves as an intermediary structure that provides the engagement point for the return spring. By positioning the partition member further toward the vehicle-body front side, footwell space is expanded while the partition member itself serves as the mediator for return spring engagement, avoiding the need for additional engagement structures.
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 configuration ensures accurate positioning of the brake pedal at the off position, simplifies assembly, and expands the footwell space by preventing the return spring from extending to the master cylinder side, enhancing the tractor's structural efficiency.
Implementation Method 1
the return spring is constituted by a torsion coil spring, and the torsion coil spring is supported by the support shaft with a coil portion being engaged with the support shaft
Implementation Method 2
the return spring is constituted by a torsion coil spring
Data Source
AI summary
A tractor includes: a vehicle body; an engine compartment; a driving unit that: is disposed behind the engine compartment, and includes: a brake pedal that includes: a support shaft; and a pedal arm portion; a master cylinder that is operated by the brake pedal and disposed further toward a vehicle-body back side than the support shaft; and a return spring that biases the brake pedal to swing back to a brake off position; and a partition that: is disposed further toward a vehicle-body front side than the brake pedal, and separates the engine compartment and the driving unit from each other, the return spring being engaged to the partition and to the pedal arm portion.