Compact Lay-Shaft Synchronizer Assembly for Reduced Gearbox Bulk
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Solution Overview
Problem
Conventional lay-shaft assemblies in vehicle transmissions are bulky due to the requirement of many parts connected to the lay-shaft, particularly in synchronized gearboxes, which increases the size and complexity of the gearbox.
Innovation Solution
A compact lay-shaft assembly design featuring a lay-shaft with adjacent gearwheels and a synchronization assembly positioned between their outer circumferential surfaces, eliminating the need for a synchronization hub and reducing the number of moving parts by using a ring-shaped biasing means support and biasing mechanism, which is integrated into the synchronizing assembly or supported by the sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional clutching mechanism with synchronization hub is used, then the gearwheels can be selectively coupled to the lay-shaft, but the number of parts increases and the lay-shaft assembly becomes bulky
Solution Approach 1:
The synchronization hub and synchronization assembly are merged into a single integrated component. The synchronization hub forms part of the clutching assembly and the synchronization assembly is positioned between the gearwheels without requiring separate mounting to the lay-shaft. This merging reduces the number of parts while maintaining the selective coupling capability.
Solution Approach 2:
The synchronization hub serves multiple functions: it acts as both the clutching mechanism component for selective coupling and as the mounting structure for the synchronization assembly. The biasing means support is integrated into the clutching assembly, providing both structural support and biasing function, reducing the overall part count.
2Ease of operation
If many parts are connected to the lay-shaft to achieve selective coupling, then the clutching mechanism functions properly, but the length and bulk of the lay-shaft assembly increases
Solution Approach 1:
The synchronization assembly is nested within the space between the adjacent gearwheels, utilizing the existing radial space rather than requiring additional axial length. The biasing means support is nested within the clutching assembly structure. This nesting approach maintains functionality while minimizing the overall assembly length.
Solution Approach 2:
The synchronization assembly is positioned in the radial dimension between the gearwheels rather than requiring additional axial dimension. The biasing means support is integrated into the clutching assembly's radial structure. This dimensional repositioning reduces the axial length of the lay-shaft assembly while maintaining all necessary functions.
3Reliability
If a synchronization hub is used to position the synchronization assembly, then the gearwheels can be synchronized, but the lay-shaft assembly requires more parts and becomes more complex
Solution Approach 1:
The synchronization hub and synchronization assembly are merged into a single integrated component. The synchronization hub forms part of the clutching assembly and the synchronization assembly is positioned between the gearwheels without requiring separate mounting to the lay-shaft. This merging reduces the number of parts while maintaining the selective coupling capability.
Solution Approach 2:
The clutching assembly itself provides the mounting function for the synchronization assembly through its integrated hub structure. The biasing means support is self-contained within the clutching assembly, providing both structural support and biasing function without requiring external components. This self-service approach reduces parts quantity while maintaining synchronization reliability.
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 design reduces the length and bulk of the lay-shaft assembly, decreases the number of parts, and simplifies the clutching mechanism, making the gearbox more compact and efficient.
Implementation Method 1
biasing means configured for biasing the sleeve to a decoupled position
Data Source
AI summary
A lay-shaft assembly for use in a vehicle transmission includes a clutching mechanism with a synchronization assembly arranged for synchronizing rotation of a driven gearwheel with a first gearwheel or a second gearwheel. The first and second gearwheels extend adjacently with respect to each other along the central axis, and the synchronizing assembly is positioned between adjacent respective outer circumferential surfaces of the adjacent first and second gearwheels and the sleeve. A ring-shaped biasing means support and a complementary biasing means insert for placing onto the ring shaped biasing means support.