Hybrid Gearbox Layout for Reduced Longitudinal Transmission Length
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Solution Overview
Problem
Existing hybrid transmissions face challenges in achieving the most compact design and high power density, particularly along the main transmission shaft, which affects their efficiency and integration within vehicle space constraints.
Innovation Solution
The hybrid transmission design incorporates a parallel arrangement of key components such as the electric machine, power electronics, and control units, optimizing their placement to minimize axial space usage, including an L-shaped power electronics layout and overlapping components to maximize integration and power density, while ensuring efficient packaging and crash safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If components are arranged in a conventional layout, then ease of manufacture is improved, but the transmission length in the longitudinal direction increases
Solution Approach 1:
The patent transitions from a conventional longitudinal arrangement to a three-dimensional spatial configuration where the electric machine is positioned laterally adjacent to the countershaft and power electronics are arranged in multiple layers (stator above countershaft, rotor below). This dimensional reorganization reduces the longitudinal footprint while maintaining functional relationships through vertical and lateral positioning.
Solution Approach 2:
The patent implements nested positioning where the stator is arranged above the countershaft and the rotor is arranged below the countershaft, creating a vertically stacked configuration. The power electronics are similarly nested with the control unit positioned adjacent to and overlapping with the electric machine components, maximizing space utilization in the longitudinal direction.
2Power
If components are integrated closely, then power density is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functional components into a compact integrated assembly where the electric machine (stator and rotor), power electronics (inverter and control unit), and transmission elements (countershaft) are positioned in close proximity with overlapping arrangements. This consolidation achieves high power density by eliminating unnecessary spacing while maintaining functional independence of each subsystem.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a hybrid gearbox (1) for a vehicle, said hybrid gearbox comprising: a gearbox input shaft (5) that extends in a transverse direction (y); at least one countershaft (6) positioned parallel to the gearbox input shaft (5); a clutch device (7) which is positioned coaxially with respect to the gearbox input shaft (5) and which has at least one clutch; a differential which has a differential input gear (4), wherein an axis of rotation (19) of the differential input gear is positioned parallel to the gearbox input shaft (5); an electric machine (3) which has a rotor and a stator, wherein a rotor rotational axis (9) is positioned parallel to the gearbox input shaft (5); a gearbox control device (11), wherein, as viewed in a longitudinal direction (x) which is perpendicular to the transverse direction (y), the differential input gear (4), the gearbox input shaft (5), and a gearbox controller comprising the gearbox control device (11) are arranged in succession in the sequence specified.