Asymmetrical Ramps for Synchronization Device Servo Force
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Solution Overview
Problem
Existing synchronization devices face challenges in producing optimized servo forces for gear shifting, leading to increased wear and susceptibility to axial tolerances, with complex structures and prolonged synchronization processes.
Innovation Solution
The use of asymmetrical ramps for servo force production during upshifting and downshifting, allowing for differential axial servo forces based on gear requirements, which simplifies the construction and reduces wear by optimizing shifting forces and times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocking pieces are spaced apart circumferentially in a uniform manner to produce servo force, then synchronization function is achieved, but structure becomes complex and wear increases
Solution Approach 1:
The patent extracts the servo force production function from the blocking pieces and transfers it to the ramps. The blocking pieces are reduced to only their blocking function, while the ramps independently handle servo force generation through their angular geometry, simplifying the overall structure.
Solution Approach 2:
The synchronization device is segmented into distinct functional elements: blocking pieces for axial blocking only, and ramps for servo force production only. This functional segmentation allows each component to be optimized independently, reducing complexity while maintaining reliability.
2Reliability
If blocking pieces are supported by ramps as force transfer surfaces, then servo force is produced, but axial tolerances susceptibility increases and wear increases
Solution Approach 1:
The force transfer function is extracted from the blocking pieces and assigned to the ramps. The ramps are designed with specific angular geometry that provides inherent tolerance compensation, reducing susceptibility to axial tolerances while maintaining effective servo force production.
3Reliability
If blocking faces are designed wide to accommodate angular positions, then servo force transfer is improved, but sliding transfer phase lengthens and force expenditure increases
Solution Approach 1:
The ramps are designed with optimized local geometry at the force transfer surfaces, using specific angular angles that maximize force transfer efficiency within a compact axial space. This eliminates the need for wide blocking faces while maintaining effective servo force transfer.
Solution Approach 2:
The angular parameters of the ramps are specifically optimized to achieve effective servo force transfer over a shortened axial distance. By changing the geometric parameters of the ramps, the sliding transfer phase is reduced without compromising force transfer reliability.
4Productivity
If asymmetrical ramps are used for upshifting and downshifting, then shifting forces are optimized, but manufacturing complexity increases
Solution Approach 1:
Asymmetrical ramps are implemented with different angular geometries optimized for upshifting and downshifting operations. The first ramps have angles optimized for one direction while the second ramps have angles optimized for the opposite direction, allowing force optimization without requiring complex multi-component systems.
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 approach reduces axial shifting force, shortens synchronization time, and minimizes wear by providing a uniform force characteristic during shifting, enhancing user experience and reducing production costs.
Implementation Method 1
ramps for producing a servo force axial with respect to the shaft are provided on at least one component part
Implementation Method 2
the blocking synchronizer ring for its part exerting on the change wheel a circumferential force or torque by means of friction in order to brake or accelerate the change wheel
Data Source
AI summary
A synchronization device for a transmission includes a sliding sleeve, a blocking synchronizer ring and a change wheel. In a force flow region between the blocking synchronizer ring and the change wheel, ramps for producing a servo force axial with respect to the shaft are provided on at least one component part.