Timing Cover Accessory Drive Layout for Compact Hybrid Powertrains
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Solution Overview
Problem
Existing hybrid engine configurations face challenges such as increased radial size, efficiency limitations due to belt transmission, and complexity in the connection between the heat engine and electric motor, leading to congestion, reduced efficiency, and difficult assembly/disassembly.
Innovation Solution
The proposed solution involves a distribution housing that carries a training system with a primary sleeve and longitudinal grooves on the crankshaft end, allowing for a compact arrangement of the electric machine and accessories along the heat engine's longitudinal axis, thereby reducing the radial size and simplifying the coupling and disconnection of the electric machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electric machine is arranged against the wall of the heat engine, then the connection between the two motors is simplified, but the radial size of the assembly increases considerably
Solution Approach 1:
The patent relocates the electric machine from a radial arrangement (against the heat engine wall) to a longitudinal arrangement (at the end of the crankshaft along the longitudinal axis). This dimensional change allows the electric machine to be connected via the timing cover without increasing radial size, while still maintaining simplified connection through direct coupling at the crankshaft end.
2Device complexity
If a belt drive is used to connect the electric motor to the heat engine, then the arrangement is simplified, but the transmission efficiency is limited
Solution Approach 1:
The patent removes the belt drive intermediate element from the power transmission system. Instead of using a belt to connect the electric motor to the heat engine accessories, the electric machine is directly coupled to the crankshaft end, eliminating the belt transmission and its associated energy losses while maintaining arrangement simplicity.
3Reliability
If the electric machine is positioned against the thermal engine, then the connection is direct, but the assembly and disassembly of the two motors becomes complex
Solution Approach 1:
The patent segments the powertrain assembly into modular components: the heat engine, the timing cover with integrated accessories, and the electric machine. The electric machine can be independently assembled to the timing cover and then coupled to the crankshaft, allowing separate assembly and disassembly of each module while maintaining reliable direct connection during operation.
Data Source
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AI summary
A motor vehicle powertrain arrangement comprising an internal combustion engine having a crankshaft connected with a drive system (10) of accessories (36) of the internal combustion engine and an electric machine (20). Characterized in that said drive system (10) is carried by a timing cover (40) covering a timing face of the internal combustion engine.