Vehicle Drive Layout With Sealed Terminal Block Oil Separation
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Solution Overview
Problem
Existing drive devices for vehicles face challenges in minimizing overall length while maintaining effective insulation and lubrication properties, particularly in the terminal block and gear chambers.
Innovation Solution
The drive device incorporates a terminal block chamber between the electric motor chamber and the gear chamber, with a first lubricating oil in the electric motor and terminal block chambers and a second lubricating oil in the gear chamber, sealed by an oil seal to enhance insulation and lubrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the terminal block chamber is provided between the electric motor chamber and the gear chamber to shorten the overall length, then the length of the drive device is reduced, but the insulation properties of the terminal block may be compromised due to proximity to the gear chamber
Solution Approach 1:
The drive device is divided into three separate chambers (electric motor chamber, terminal block chamber, and gear chamber) arranged in sequence along the longitudinal direction. This segmentation allows the terminal block chamber to be positioned between the electric motor chamber and gear chamber, shortening the overall length while maintaining insulation through physical separation and oil sealing
Solution Approach 2:
A partition wall with an oil seal acts as an intermediary barrier between the terminal block chamber and gear chamber. The oil seal prevents lubricating oil from the gear chamber from reaching the terminal block, thereby maintaining insulation properties while allowing the compact chamber arrangement
2Reliability
If different lubricating oils are used in different chambers for optimal lubrication, then the lubrication efficiency is improved, but the device complexity increases due to multiple oil seals and chamber separations
Solution Approach 1:
Different lubricating oils are used in different chambers according to their specific lubrication requirements: first lubricating oil (with insulating properties) is used in the electric motor chamber and terminal block chamber, while second lubricating oil (suitable for gear lubrication) is used in the gear chamber. This local differentiation optimizes lubrication efficiency for each component while maintaining overall system compactness
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
This configuration effectively improves the insulation properties of the terminal block, reduces the size of the terminal block, and ensures efficient lubrication of both the electric motor and the gears, contributing to a more compact and efficient drive device.
Implementation Method 1
A gap between the rotor shaft and the second through hole is sealed by an oil seal
Implementation Method 2
an oil film of the first lubricating oil is formed on a surface of the terminal block. Thus, insulating properties of the terminal block are improved
Data Source
AI summary
A drive device installed in a vehicle includes a case including an electric motor chamber, a terminal block chamber, and a gear chamber, an electric motor, a terminal block, a speed reducer, and a hypoid gear. A first through hole is provided in a partition wall between the electric motor chamber and the terminal block chamber. A second through hole is provided in a partition wall between the terminal block chamber and the gear chamber. The electric motor includes a rotor shaft extending from the electric motor chamber through the first through hole, the terminal block chamber, and the second through hole, to the gear chamber. A gap between the rotor shaft and the second through hole is sealed by an oil seal. A first lubricating oil is accommodated in the electric motor chamber and the terminal block chamber. A second lubricating oil is accommodated in the gear chamber.