Upper Arm Attachment Structure for Low-Hood Double Wishbone Suspension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing attachment structures for double wishbone shock absorbers in vehicles suffer from reduced rigidity and deformation in front collisions, leading to interference issues with the hood and drive shaft due to insufficient vertical sectional height and rigidity, making it difficult to achieve a low hood height design.
Innovation Solution
An attachment structure for the upper arm of a double wishbone shock absorber that includes a reinforcing member with a rigid portion to increase the rigidity of the side member, allowing the inner end of the upper arm to be tiltably supported, and a design that reduces the vertical sectional height by lowering the top wall position while maintaining the bottom wall position, thus preventing deformation and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the attachment recesses are not closed in the side frame, then the manufacturing complexity is reduced, but the rigidity of the side frame decreases and deformation occurs in front collisions
Solution Approach 1:
The side frame is divided into multiple components: the main side frame body and separate reinforcing members. The reinforcing members are attached to specific regions (attachment recesses) to provide localized reinforcement without requiring the entire side frame to be a closed complex structure. This segmentation allows the simple open-side-frame design to achieve the required rigidity through strategic reinforcement.
Solution Approach 2:
Reinforcing members are strategically placed in specific locations where rigidity is needed most - at the attachment recesses and along the side frame edges. This local reinforcement approach provides the necessary strength and collision resistance only where required, rather than uniformly strengthening the entire side frame, thus maintaining manufacturing simplicity while achieving the desired rigidity.
2Length of stationary object
If the vertical sectional height dimension of the side frame is reduced, then the hood height can be minimized, but the side frame may interfere with the drive shaft when the drive shaft is raised
Solution Approach 1:
The side frame is designed with a U-shaped cross-section that utilizes the lateral dimension (width) more effectively to provide structural strength, allowing the vertical dimension (height) to be reduced. The U-shape configuration with proper wall thickness and reinforcement in the lateral direction compensates for the reduced height, maintaining overall structural integrity while enabling lower hood height design without drive shaft interference.
3Length of stationary object
If the top wall position is lowered to reduce vertical sectional height, then the hood height is reduced, but the ground clearance decreases and drive shaft interference occurs
Solution Approach 1:
The side frame employs localized reinforcement through U-shaped reinforcing members positioned at critical areas. This allows the top wall to be lowered for reduced hood height while the reinforcing members maintain structural strength and prevent excessive deformation. The strategic placement of reinforcement compensates for the reduced height, preserving ground clearance and preventing drive shaft interference.
Solution Approach 2:
The side frame combines the main frame structure with separate reinforcing members to create a composite structural system. This composite approach allows optimization of different regions - the main frame can have reduced height for compact hood design, while the reinforcing members provide the necessary structural support and collision resistance, effectively decoupling the height reduction from structural weakness.
Data Source
AI summary
The double wishbone shock absorber includes an upper arm that is pivotally supported by a side member having a rectangular cylindrical shape at an inner end thereof, and a lower arm that is pivotally supported by the suspension member at an inner end thereof and is pivotally supported at a lower end of the suspension at an outer end thereof. In a region of the side member that pivotally supports the inner end of the upper arm, an opening extending from the outer side hanging wall portion of the side member to the bottom wall portion is provided. A reinforcing member that closes the opening is attached to the opening. The reinforcing member is provided with a rigid portion for increasing rigidity.