Gearbox Neutral Calibration Blocking Element on Return Spring
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Solution Overview
Problem
The existing method tools used to calibrate the control lever of a gearbox in neutral position can cause stress on the return spring, leading to misalignment of the calibration points, resulting in incorrect calibration of the control lever and gearbox.
Innovation Solution
A calibration device with a blocking element is mounted directly on the return spring, featuring interlocking parts with complementary teeth to exert a clamping and blocking force on the spring strands, ensuring accurate alignment without constraining the spring, and can be easily removed by pulling a flexible link to synchronize with the internal gearbox control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a method tool is used to block the lever in neutral position, then the calibration between control lever and gearbox internal control can be achieved, but the method tool generates stress on the return spring causing misalignment of calibration points
Solution Approach 1:
The patent introduces a calibration device that acts as an intermediary between the method tool and the return spring. This device includes a blocking element that can be mounted directly on the return spring to block the lever in neutral position, while the spring itself serves as the mounting support. The blocking element features interlocking parts with complementary teeth that exert clamping and blocking force on the spring strands without generating harmful stress, thereby achieving precise calibration while avoiding spring constraint.
Solution Approach 2:
The invention extracts the blocking function from the traditional method tool and transfers it to a dedicated blocking element that can be mounted directly on the return spring. This separation allows the method tool to be removed after calibration, eliminating the source of stress on the spring while maintaining the calibration achievement. The blocking element is specifically designed to work with the spring structure without constraining it.
2Measurement precision
If a method tool is mounted on the control lever to suppress selection function, then neutral calibration can be performed, but the tool causes misalignment of the three reference points
Solution Approach 1:
The calibration device serves as an intermediary that achieves the blocking function without disrupting the alignment of reference points. By mounting the blocking element directly on the return spring rather than on the control lever, the device avoids interfering with the geometric relationship between the pivot axis, lug, and lever articulation end, thus maintaining proper alignment of all three reference points.
3Measurement precision
If the return spring is constrained by the method tool, then the lever can be blocked in neutral, but the selection element moves angularly causing incorrect calibration
Solution Approach 1:
The invention extracts the blocking function from a lever-mounted tool and relocates it to a spring-mounted element. This allows the blocking action to be achieved without constraining the spring, thereby preventing angular movement of the selection element and ensuring accurate lever positioning during calibration.
Solution Approach 2:
The blocking element is designed to be removable, allowing the system to transition between calibrated and operational states. During calibration, the blocking element is mounted on the spring to achieve precise neutral positioning. After calibration, the blocking element can be removed, allowing the spring to return to its natural state and the lever to function normally without constraints.
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 solution allows for precise calibration of the control lever in neutral position without stress on the return spring, ensuring accurate alignment and operation of the gearbox, and can be used with adjustable reverse gear curbs.
Implementation Method 1
a hairpin spring mounted in a prestressed manner. The branches of the spring are biased separately under the pivoting effect of the lever by a finger or lug integral with the selection element
Implementation Method 2
the element comprises a body having fittings for positioning the strands of the spring, and able to exert a clamping and blocking force on said strands
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The device has an element (7) directly mounted on a pull off spring (5) to block a shifter lever (L) at a dead centre. The element is engaged on strands (5a, 5b) of the spring, where the strands are in support with a selector finger (3) subjected to the lever. The element has a body presenting arrangements for positioning the strands to exert the locking and blocking effect of the strands, where the arrangements are constituted by a complementary denture system.