Vehicle Driving Device Segmented Case and Inverter Seal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle driving devices with integrated inverter and rotary electrical machines face challenges in size reduction and complex seal structures, leading to increased physical size and complexity in sealing liquid ingress.
Innovation Solution
The configuration includes an oil-tight space formed between the first and second case sections, with the inverter accommodation chamber located between the second case section and a cover member, and the wiring member passing through the second case section, simplifying the seal structure by sealing only between the cover member and the wiring member, reducing the device's physical size, and allowing for more space for auxiliary machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a cover member is provided across the first case section and the second case section, then the inverter device can be accommodated, but the physical size of the entire device becomes large
Solution Approach 1:
The case is divided into a first case section and a second case section that are joined together. The cover member is provided only on the second case section, not spanning across both sections. This segmentation allows the inverter device to be accommodated in the second case section without requiring a large cover member across the entire device, thereby reducing the overall physical size.
2Device complexity
If a cover member is provided across the first case section and the second case section, then the inverter device can be accommodated, but a relatively complex seal structure is required
Solution Approach 1:
The case is segmented into first and second case sections, with the cover member provided only on the second case section. This segmentation reduces the seal structure complexity because seals are only required at the junction between the cover member and the second case section, and between the first and second case sections, rather than requiring a complex seal structure across the entire device as would be needed if a single cover member spanned both sections.
3Device complexity
If the wiring member structure is disposed in a space on the outer peripheral side of the first case section, then connection to the rotary electrical machine is achieved, but a seal member provided across both case sections is required
Solution Approach 1:
The wiring member structure is extracted from the conventional arrangement where it would require sealing across both case sections. Instead, the wiring member structure is configured to pass through the second case section and extend into the oil-tight communication space, where it can be sealed more simply. This extraction of the wiring structure from the complex multi-section seal arrangement reduces the overall seal structure complexity while maintaining the necessary sealing function.
Data Source
AI summary
A vehicle driving device that includes a rotary electrical machine that functions as a driving force source of a wheel along with an internal combustion engine; a transmission device that is disposed side by side with respectnext to the rotary electrical machine in an axial direction, the axial direction being a direction in which a rotation axis center of the rotary electrical machine extends; a case including a first case section that accommodates the rotary electrical machine and a second case section that accommodates the transmission device; an inverter device that controls the rotary electrical machine; and a wiring memberstructure that connects the rotary electrical machine and the inverter device.