Gearbox Synchronizing Unit With Return Spring for Vibration Control
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Solution Overview
Problem
Existing synchronization units face challenges in achieving a simple, cost-effective design while minimizing vibrations and noise generation, particularly at high speeds, and require a compact installation space.
Innovation Solution
A synchronization unit design featuring a spring-loaded, ring-shaped return spring element that is coupled to the synchronizer ring and hub, preventing relative movements and vibrations, and utilizing a simple, cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional synchronizing mechanism is used, then the gearbox can operate in reverse gear, but the synchronizing ring has a large axial width requiring deep engagement grooves that complicate manufacturing
Solution Approach 1:
Instead of having the synchronizing ring engage deeply into the gear body (conventional approach), the invention inverts the engagement direction: the engagement groove is formed on the synchronizing ring itself, and the gear body has a protruding engagement element that fits into this groove. This allows shallow engagement while maintaining synchronizing reliability.
Solution Approach 2:
The synchronizing mechanism is segmented into distinct functional elements: a synchronizing ring with an engagement groove, a gear body with a separate protruding engagement element, and a synchronizing dog. This segmentation allows each component to be optimized independently, reducing the axial width requirements while maintaining functional reliability.
2Reliability
If the engagement groove is formed deeply in the gear body, then the synchronizing ring can engage properly, but the gear body requires more material and has increased complexity
Solution Approach 1:
The engagement groove is relocated from the gear body to the synchronizing ring, and the gear body is given a simple protruding engagement element instead of a deep groove. This inversion simplifies the gear body structure while maintaining reliable engagement through the protrusion-fit-groove mechanism.
3Reliability
If a wide axial width synchronizing ring is used, then sufficient engagement surface is available, but the overall gearbox size increases
Solution Approach 1:
Instead of increasing the axial width of the synchronizing ring to provide sufficient engagement surface, the invention inverts the approach by creating a focused engagement groove on the ring that concentrates the contact surface area in a compact region, allowing reliable engagement with reduced axial width.
Solution Approach 2:
The engagement groove on the synchronizing ring provides localized high-quality contact surface precisely where needed for engagement, rather than requiring the entire ring to have large axial width. This concentrates the functional surface area where it is most effective.
Data Source
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AI summary
A synchronization unit (10) for a manual transmission is described, comprising a hub (12) that is rotationally and axially fixed to a transmission shaft and is rotatable about a central axis (14) of the synchronization unit (10). The synchronization unit (10) further comprises a sliding sleeve (16) that is rotationally and axially displaceably coupled to the hub (12) and a synchronizer ring (26, 28) that can be coupled to a gear by axial actuation of the sliding sleeve (16). A return spring element (30, 32) is provided, which is coupled to both the synchronizer ring (26, 28) and the hub (12).