Hybrid Transmission Layout for Reduced Axial Installation Space
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Solution Overview
Problem
Existing hybrid transmissions lack a compact design, particularly in the axial direction along the main gear shaft, which hinders achieving the most compact and high power density structure.
Innovation Solution
The hybrid transmission design includes a transmission input shaft, countershafts, a clutch device, differential, electric machine, and transmission control device arranged in a compact configuration with the electric machine adjacent to the hydraulic transmission controller and power electronics system integrated in a vertical direction, allowing for efficient use of installation space and high power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the electric machine, power electronics system, and transmission control device are arranged in a conventional layout, then the transmission can function properly, but the axial length along the main gear shaft becomes too long
Solution Approach 1:
The patent merges the electric machine, power electronics system, and transmission control device into a single integrated assembly. The power electronics system is positioned adjacent to the transmission control device, and both are integrated with the electric machine, creating a compact unit that reduces axial length while consolidating multiple functions into one structure
Solution Approach 2:
The patent rearranges components from a conventional linear axial layout to a three-dimensional configuration. The power electronics system is placed in a vertical or radial position relative to the transmission control device rather than extending the axial length, utilizing unused spatial dimensions to achieve compactness
2Quantity of substance
If components are integrated to reduce installation space, then power density increases, but manufacturing and assembly complexity increases
Solution Approach 1:
The integrated assembly is designed as a modular unit that can be manufactured and tested separately before installation in the transmission. The power electronics system and transmission control device are positioned to allow separate access and assembly, enabling modular manufacturing that reduces overall assembly complexity despite the integrated layout
Data Source
AI summary
A hybrid transmission for a vehicle includes a transmission input shaft extending in a transverse direction, at least one countershaft arranged parallel to the transmission input shaft, a clutch device arranged coaxially with respect to the transmission input shaft and which has at least one clutch, and a differential having a differential input gear. A rotational axis of the differential input gear is arranged parallel to the transmission input shaft. The transmission also includes an electric machine having a rotor with a rotor rotational axis arranged parallel to the transmission input shaft and a transmission control device. As viewed in a longitudinal direction perpendicular to the transverse direction, the differential input gear, the transmission input shaft, and a transmission controller including the transmission control device are arranged in succession in the sequence specified.