Multi-Speed Transmission Gear Spacing Optimization
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Solution Overview
Problem
Existing multi-speed transmissions face limitations in high-precision gear spacing optimization and acoustic issues, with difficulty in adding additional gears without significant design effort, and complex designs that increase costs and installation space.
Innovation Solution
A multi-speed transmission design featuring planetary gear sets with selective shift elements, where front-mounted and rear-mounted gear sets are rigidly tied, allowing for at least eleven forward gears and one reverse gear, with a simpler structural design that includes 3-carrier 5-shaft gears and 2-carrier 4-shaft gears, reducing the number of shafts and shift elements, and using clutches and brakes for efficient gear engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional gears are implemented in known transmissions, then the number of gears increases, but design effort and complexity increase considerably
Solution Approach 1:
The transmission is divided into front-mounted gear sets and rear-mounted gear sets that can be independently configured. Each gear set segment can be optimized separately, allowing additional gears to be implemented by reconfiguring segments rather than redesigning the entire transmission system.
Solution Approach 2:
The shift elements (clutches and brakes) are designed to serve multiple functions across different gear sets. The same shift elements can engage different gear combinations in front and rear mounted gear sets, allowing a limited number of shift elements to control a large number of gears without proportionally increasing complexity.
2Adaptability or versatility
If more shafts and gear sets are added to achieve more gears, then gear variety increases, but structural complexity and installation space increase
Solution Approach 1:
Front-mounted gear sets and rear-mounted gear sets are merged into a single transmission system that shares common shafts and shift elements. This merging allows the system to achieve the functionality of multiple separate transmissions with a unified, simpler structure.
Solution Approach 2:
The patent utilizes the spatial dimension by mounting gear sets at different locations (front and rear) along the transmission axis. This dimensional arrangement allows multiple gear sets to coexist without requiring proportional increases in radial space, achieving compact packaging.
3Manufacturing precision
If conventional gear sets are used, then implementation is straightforward, but high-precision optimization of gear spacing is limited
Solution Approach 1:
The transmission system is designed with dynamic configurability through selective engagement of clutches and brakes. This allows the gear spacing and ratios to be dynamically optimized for different operating conditions, achieving high-precision gear spacing that adapts to specific performance requirements rather than being fixed by conventional rigid designs.
Data Source
AI summary
A multi-speed transmission has drive and output shafts, three front-mounted and two rear-mounted planetary gear sets, and shift elements which can be engaged to selectively implement at least eleven forward gears and one reverse gear. The front gear sets are connected to one element of the rear gear sets. Five shift elements are assigned to the front gear sets and two are assigned to the rear gear sets, such that the front gear sets transmit seven output speeds to the rear gear sets. If normalized to the input speed of the drive shaft, at least one output speed of the front gear sets is less than 0, one output speed is greater than 1, one output speed is equal to 0, one output speed is equal to 1 and two output speeds are between 0 and 1.