Freewheel Multi-Gear Transmission for Smoother Load Shifting
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Solution Overview
Problem
Existing power-shiftable multiple-gear transmissions for electric and hybrid vehicles face challenges in improving shifting quality, smooth running, and Noise Vibration Harshness (NVH) behavior, particularly under load conditions, and require complex and costly parking lock systems.
Innovation Solution
A power-shiftable multiple-gear transmission with a driven input shaft featuring a freewheel on the input shaft, utilizing spur gear toothing systems for the first and second gear stages, and a differential gear as the final stage, which allows for improved shifting quality and NVH behavior through the use of two clutches that can be actuated independently, eliminating the need for additional shifting components and enabling a parking lock function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power-shiftable multiple-gear transmissions are used without a freewheel, then the structure is simpler, but the shifting quality and NVH behavior deteriorate under load conditions
Solution Approach 1:
A freewheel mechanism is introduced as an intermediary component between the input shaft and the first power transmission element. This freewheel allows the first power transmission element to be decoupled from the input shaft during certain operating conditions, enabling smooth shifting under load without requiring complex additional components throughout the entire transmission system.
Solution Approach 2:
The freewheel mechanism extracts and isolates the first power transmission element from the input shaft rotation. By taking out this specific element and allowing it to rotate independently when needed, the system achieves improved shifting quality and NVH behavior without making the entire transmission structure overly complex.
2Reliability
If multiple clutches are used for gear shifting, then shifting quality and NVH behavior improve, but the device complexity and cost increase
Solution Approach 1:
The first power transmission element is designed with multi-functionality, serving both as a gear transmission component and as a clutch engagement component. This universal design allows the system to achieve smooth shifting and good NVH behavior through coordinated clutch operation without requiring separate dedicated clutch mechanisms for each function, thereby controlling overall system complexity.
3Reliability
If traditional parking lock systems are implemented, then parking security is ensured, but the system becomes more expensive and requires additional actuators
Solution Approach 1:
The clutch mechanisms are designed to serve dual functions: gear shifting and parking lock. By engaging both clutches simultaneously, the transmission achieves a locked state that provides parking security. This multi-functional design eliminates the need for separate parking lock actuators and complex dedicated parking lock systems, reducing overall system complexity and cost while maintaining reliable parking security.
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 shifting comfort and NVH behavior by allowing only required components to rotate, reducing noise and vibration, and eliminates the need for expensive parking lock actuators, resulting in a more efficient, cost-effective, and space-saving transmission system.
Implementation Method 1
at least one first power transmission element (20) which is arranged by means of a freewheel (21) on the input shaft (14)
Data Source
AI summary
The invention relates to a power-shiftable multi-gear transmission (12) having a driven input shaft (14) and a shaft (16). The power-shiftable multi-gear transmission (12) comprises at least one first gear stage (18) and one second gear stage (26) which are in each case configured as spur gear teeth. At least one first power transmission element is arranged on the input shaft (14) by means of a freewheel (21).