Shifting Arrangement for Selector Fork Locking
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Solution Overview
Problem
Existing shifting arrangements for selector forks in multispeed transmissions face issues with unintended displacement due to shocks, leading to frictional engagement or disengagement problems, and require complex locking mechanisms that are costly and difficult to manufacture, especially in compact transmission casings.
Innovation Solution
A shifting arrangement that uses a rotatable positioning element with a drive mechanism converting rotational motion into translational motion of the selector fork, incorporating a locking device with a spring and locking element that locks the selector fork in actuating positions without the need for additional mounting on the transmission housing or selector rod, allowing for flexible gear positioning and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is added to prevent unintended displacement of the selector fork, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking device is merged with the positioning element by integrating the locking element directly into the positioning element's structure. The locking element is received in a recess of the positioning element, combining two functions (positioning and locking) into a single component, thereby improving reliability without significantly increasing overall device complexity
Solution Approach 2:
The locking mechanism operates automatically through the interaction of the locking element and locking surface. When the positioning element rotates to a specific position, the locking element engages with the locking surface on the selector fork, providing self-locking functionality without requiring additional actuators or complex control mechanisms
2Reliability
If a complex locking mechanism is used to lock the selector fork, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The locking function is segmented into simple, discrete components: a locking element with a bearing surface and a corresponding locking surface on the selector fork. This segmentation allows each component to be manufactured independently using standard machining operations, improving ease of manufacture while maintaining locking reliability
Solution Approach 2:
The locking element is designed as a simple, inexpensive component that can be easily manufactured and replaced if necessary. The use of a simple bearing surface and locking geometry reduces manufacturing costs and complexity compared to more sophisticated locking mechanisms
3Reliability
If additional mounting structures are added to the transmission housing for the locking device, then reliability is improved, but device complexity increases
Solution Approach 1:
The positioning element serves multiple functions: it positions the selector fork, provides locking through the integrated locking element, and transmits rotational motion to linear motion through the drive mechanism. This multi-functionality eliminates the need for separate mounting structures in the transmission housing, reducing device complexity while maintaining locking stability
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 provides a simple, economically manufactured locking device that prevents unintended displacement of the selector fork, enhances gear shifting flexibility, and reduces manufacturing costs by eliminating the need for additional housing modifications, while maintaining the durability and service life of transmission components.
Implementation Method 1
The locking device is composed of a locking element and a spring, which tensions the locking element into a locking recess
Implementation Method 2
a drive mechanism for converting the rotational motion of the positioning element into a translational motion of the selector fork
Data Source
AI summary
The disclosure relates to a shifting arrangement for displacing a selector fork of a multispeed transmission assembly along a selector rod. The shifting arrangement has a positioning element which is mounted so as to be rotatable about an axis. The positioning element is connected to the selector fork, which is movably mounted on the selector rod, via a driving mechanism designed for converting the rotational movement of the positioning element into a sliding movement of the selector fork along the selector rod. The shifting arrangement further comprises also has a locking device for locking the selector fork in selected operating positions. The locking device is designed for establishing a locking connection between the positioning element and the selector fork.