Shift Device Axial Spring Mounting for Transmission Dog Clutch
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Solution Overview
Problem
Existing shift devices for dog clutch mechanisms in transmissions require time and effort to attach and detach coil springs, which are arranged radially outside the shift shaft, and their configuration leads to a bulky design and slow operation force transmission.
Innovation Solution
A shift device with an elastic member holder on the shift shaft and a coil spring arranged radially outside, compressible and expandable between the holder and the shift member, biasing the shift member axially, allowing for increased flexibility and easier attachment, and a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil spring is fit onto the outer peripheral surface of the lever shaft before attachment, then the waiting mechanism can function properly, but the attachment work takes time and effort
Solution Approach 1:
The invention divides the spring mounting structure into separate components: the lever shaft and the spring holder. The spring is mounted on the holder rather than directly on the lever shaft, allowing the holder to be attached to the lever shaft afterward. This segmentation enables independent assembly of the spring-holder unit and simplifies the overall attachment process.
Solution Approach 2:
The spring holder acts as an intermediary component between the coil spring and the lever shaft. Instead of mounting the spring directly to the lever shaft, the holder serves as a mediator that facilitates easier attachment and detachment while maintaining the spring's functional connection to the lever shaft.
2Reliability
If the coil spring is arranged upstream of the detent mechanism, then the waiting mechanism can operate, but the spring load must be greater than the detent holding load causing the spring to be always twisted
Solution Approach 1:
The invention changes the spatial arrangement by positioning the spring holder and coil spring downstream of the detent mechanism rather than upstream. This dimensional repositioning in the operational sequence allows the spring to engage after the detent mechanism, eliminating the need for the spring to overcome detent holding forces and preventing continuous twisting.
3Reliability
If the coil spring is arranged radially outside the shift shaft, then the waiting mechanism can function, but the configuration leads to a bulky design
Solution Approach 1:
The spring holder is designed to be nested on the lever shaft, with the coil spring nested on the holder. This nested arrangement allows the waiting mechanism components to be compactly integrated along the axial direction of the lever shaft, reducing the overall radial footprint and eliminating the bulky appearance associated with radially outward spring placement.
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 solution enhances the flexibility of the elastic member arrangement, simplifies the attachment process, and achieves a compact shift device with improved axial length and operational smoothness by positioning the elastic member outside the shift shaft, ensuring efficient force transmission without affecting the waiting mechanism's operation.
Implementation Method 1
an elastic member arranged outside of the shift shaft in a radial direction of the shift shaft, the elastic member being arrange so as to be compressed and expanded in the axial direction between the elastic member holder and the shift member, and the elastic member biasing the shift member toward one side in the axial direction
Data Source
AI summary
The present invention is a shift device for switching a dog clutch mechanism in a transmission, comprising: a shift shaft capable of moving in an axial direction; a shift member capable of moving in the axial direction within a predetermined waiting stroke range; an elastic member holder for a waiting mechanism; and an elastic member provided in outside of the shift shaft in a radial direction so as to be compressed and expanded between the elastic member holder and the shift member, wherein the elastic member biases the shift member toward one side in the axial direction.