Vehicle Transmission Duplicate Shift Device One-Way Clutch
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Solution Overview
Problem
Automated Manual Transmissions (AMTs) experience torque interruption during gear shifts, leading to deteriorated smooth shifting and riding comfort due to the need to disconnect and reconnect the clutch, which interferes with the smooth supply of engine torque to the driving wheels.
Innovation Solution
A transmission system with a duplicate shift device and a one-way clutch that allows power to be transmitted only to specific gears, enabling duplicate gear shift ranges with the same gear ratios as initial shift ranges, thereby minimizing torque interruption and improving shifting smoothness and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a clutch actuator is used to disconnect and reconnect the clutch during gear shifts, then gear shifting can be automated, but torque interruption occurs leading to deteriorated smooth shifting and riding comfort
Solution Approach 1:
The transmission system is divided into two independent paths: a main shift path (second input shaft → initial shift device → driven gears → first output shaft) and a duplicate shift path (first input shaft → duplicate shift device → one-way clutch → first output gear). This segmentation allows the duplicate path to provide continuous torque during shifts in the main path, preventing torque interruption while maintaining automation.
Solution Approach 2:
The one-way clutch acts as an intermediary element that allows torque to pass from the duplicate shift device to the first output gear only in one direction. This enables the duplicate path to supplement torque during shifts without interfering with the normal operation of the main shift path, thus preventing torque interruption while maintaining smooth shifting.
2Adaptability or versatility
If the clutch is disconnected and reconnected during gear shifts, then gear ratio changes can be achieved, but torque supply to driving wheels is interrupted
Solution Approach 1:
The duplicate shift device pre-establishes a parallel torque transmission path before shifts occur in the main path. By having the first input shaft continuously connected to the engine and the duplicate shift device ready to engage, torque can be maintained through the one-way clutch to the first output gear even when the clutch disconnects for gear ratio changes in the main path.
3Ease of operation
If a duplicate shift device is added to prevent torque interruption, then smooth shifting is improved, but device complexity increases
Solution Approach 1:
The first input shaft and duplicate shift device serve multiple functions: they provide continuous torque during shifts (preventing interruption), maintains a ready state for quick engagement, and work in parallel with the main shift path. This multi-functionality justifies the added complexity by delivering significant performance benefits in smoothness and rider comfort.
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 transmission system prevents torque interruption during gear shifts, enhancing smooth shifting and riding comfort by ensuring continuous power delivery to the driving wheels, while maintaining a compact and simple configuration that facilitates easy vehicle mounting and improves fuel efficiency.
Implementation Method 1
a one-way clutch disposed in a power transmission line from the engine to the first output gear through the duplicate shift device to transmit power from the engine only to the first output gear
Data Source
AI summary
A transmission for a vehicle may include a first input shaft continuously receiving power from an engine, a second input shaft selectively receiving power from the engine, a first output shaft and a second output shaft disposed in parallel with the first input shaft and the second input shaft, an initial shift device including a plurality of driving gears on the second input shaft, a plurality of driven gears on the first output shaft and the second output shaft for making a series of gear shift ranges, and a plurality of synchronizers selectively making a predetermined gear shift range of the gear shift ranges made by the driving gears and the driven gears, a duplicate shift device configured to make duplicate gear shift ranges, a first output gear disposed on the first output shaft to draw power from the first output shaft, and a one-way clutch.