Motor Casing Layout for Inclined Oil Cooler Mounting
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Solution Overview
Problem
Existing methods for forming oil passages in die-cast products are inefficient and do not accommodate the inclined mounting requirements of vehicle drive devices, particularly in front compartments with hood inclinations, which complicates the integration of oil coolers and equipment mounting seats.
Innovation Solution
A motor casing structure with an inclined equipment mounting seat and an L-shaped oil passage formed by casting and machining, where the oil cooler connection seat and cast hole are inclined to match the hood's angle, allowing for efficient mounting and direct attachment of oil coolers, and a manufacturing method involving multiple molds and machining to achieve this configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional die casting methods with core pins are used to form oil passages, then oil passages can be formed in the motor casing, but the process becomes complex and cannot accommodate inclined mounting requirements for vehicle drive devices in front compartments with hood inclinations
Solution Approach 1:
The patent applies preliminary action by pre-forming the inclined cast hole at the correct angle during the die casting process itself, rather than forming vertical holes and subsequently machining them to the required inclination. The core pin is positioned at the predetermined angle before casting, so the inclined oil passage is created in advance, eliminating the need for complex post-casting machining operations and accommodating the inclined mounting requirements directly.
Solution Approach 2:
The patent changes the parameter of hole inclination from the conventional vertical orientation to a predetermined angle that matches the hood inclination. By adjusting the core pin angle during die casting, the oil passage is formed with the required inclination parameter, enabling direct attachment of oil coolers and equipment mounting seats at the correct angles for front compartment installation.
2Ease of manufacture
If vertical cast holes are formed by conventional die casting, then the casting process is simple, but additional machining is required to create inclined oil passages for proper mounting alignment
Solution Approach 1:
The patent performs the inclination operation in advance during the casting process by positioning the core pin at the required angle before molten metal is injected. This preliminary formation of the inclined hole eliminates the need for subsequent machining operations to create the inclination, thereby reducing post-casting time while maintaining manufacturing simplicity.
Solution Approach 2:
The patent merges the hole formation and inclination creation operations into a single die casting step. By using an angled core pin during casting, both the oil passage formation and the required inclination are achieved simultaneously, combining what would otherwise be separate casting and machining operations into one efficient process.
3Manufacturing precision
If multiple separate operations are used to form inclined oil passages, then precision can be maintained, but productivity decreases due to multiple processing steps
Solution Approach 1:
The patent ensures manufacturing precision by pre-positioning the core pin at the exact required angle before casting. This preliminary setup establishes the correct oil passage inclination in a single operation, maintaining the precision that would otherwise require multiple machining steps while significantly improving productivity by eliminating those additional operations.
Solution Approach 2:
The die casting process is made multi-functional by simultaneously achieving hole formation, inclination creation, and surface finishing in one operation. The angled core pin serves multiple purposes: it creates the oil passage cavity, establishes the required inclination angle, and provides a precise reference for subsequent assembly operations, thereby maintaining precision while boosting productivity.
Data Source
AI summary
A motor casing of cast metal used for a vehicle drive device, comprising an equipment mounting seat provided on a top part, an oil cooler connection seat, and a longitudinal hole opened in the oil cooler connection seat, wherein a seat surface of the equipment mounting seat is inclined to get higher from one side to the other, and the longitudinal hole is inclined to get higher from one side to the other in parallel to the seat surface.