Portal Unit Housing Mount Bolt Segmentation
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Solution Overview
Problem
Conventional portal units for vehicles have inefficient assembly processes and increased weight and cost due to the need for a connection member that matches the size of the housing body and cover, which are co-tightened using multiple connection bolts.
Innovation Solution
The portal unit features a housing with an inner side wall having mount bolts for the suspension unit, allowing the connection member to be downsized and assembled independently of the housing, with a configuration that includes a shaft portion and head portion for enhanced mount strength, enabling efficient assembly and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mount plate is co-tightened with the housing body and cover using multiple connection bolts, then the connection member can be securely fixed to the housing, but the mount plate must be substantially the same size as the housing body's end wall, which increases the weight and cost of the connection member
Solution Approach 1:
The invention divides the fixation function into two separate stages: first, the housing body and cover are connected using connection bolts; second, the connection member is fixed to the formed housing using separate mounting bolts. This segmentation allows the mount plate to be smaller and lighter while maintaining secure fixation, as it only needs to accommodate the mounting bolts rather than the entire housing structure.
Solution Approach 2:
The housing body and cover are connected together in advance using connection bolts to form a complete housing structure before the connection member is installed. This preliminary action creates a stable base that allows the mount plate to be downsized, as the structural integrity is already established by the pre-assembled housing.
2Reliability
If the mount plate is co-tightened with the housing body and cover using multiple connection bolts, then the connection member can be securely fixed to the housing, but the assembly work efficiency of the connection member deteriorates
Solution Approach 1:
The assembly process is segmented into distinct steps: first assembling the housing body and cover, then separately installing the connection member with its own mounting bolts. This segmentation simplifies each individual assembly operation, making the overall process more efficient compared to the complex simultaneous co-tightening of multiple components.
Solution Approach 2:
The housing assembly is prepared in advance by connecting the housing body and cover before the connection member is installed. This preliminary preparation reduces the complexity of the final assembly step, allowing workers to efficiently install the smaller mount plate without the constraints of simultaneous multi-component tightening.
3Reliability
If the mount plate is co-tightened with the housing body and cover using multiple connection bolts, then the connection member can be securely fixed to the housing, but the cost of the connection member increases
Solution Approach 1:
The fixation system is segmented into the housing assembly (body and cover) and the connection member (mount plate and brackets), each with their own dedicated fastening mechanism. This segmentation allows the mount plate to be manufactured at a smaller, more cost-effective size while maintaining secure fixation through the separate mounting bolt system.
Solution Approach 2:
The housing structure is preliminarily assembled and validated before the connection member is manufactured and installed. This allows for optimization of the mount plate design to be smaller and less expensive, as the structural requirements are already established by the pre-assembled housing.
Data Source
AI summary
A portal unit is provided. The portal unit includes a deceleration gear train and a housing. The housing includes an inner side wall that is formed with an input opening at a position above a rotation axial line of a driving wheel, an outer side wall that is formed with an output opening at a coaxial position with the rotation axial line of the driving wheel, and an intermediate wall that connects peripheral edges of the inner side wall and the outer side wall. The inner side wall is provided, at a radially outward position of the input opening, with mount bolts for the suspension unit. The mount bolts each include a shaft portion protruding inwardly in a vehicle width direction.