Double Wishbone Suspension Lateral Arm Stabilizer Link Connection
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Solution Overview
Problem
The double wishbone type suspension device experiences instability in the lateral arm due to twisting caused by reaction loads from the stabilizer link, and forming a hole at the upper surface of the lateral arm may degrade its rigidity.
Innovation Solution
A double wishbone type suspension device configuration where the lower end of the stabilizer link is connected inside a hole on the upper surface of the lateral arm, and the compression arm is bifurcated to interpose the hole from both the inside and outside, maintaining the connection point on the line connecting the arm ends and reinforcing the lateral arm's rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lower end of the stabilizer link is connected to the upper surface of the lateral arm, then the connection is simplified, but the lateral arm twists and rotates about the line due to reaction load, causing instability
Solution Approach 1:
The compression arm is divided into two separate arms (inner compression arm and outer compression arm) that connect to the lateral arm at different locations. This segmentation allows the reaction load from the stabilizer link to be distributed to two distinct connection points, preventing the lateral arm from twisting about the line while maintaining connection simplicity.
2Stability of the object's composition
If a hole portion is formed at the upper surface of the lateral arm to locate the connection point on the line, then twisting is prevented, but the rigidity of the lateral arm is degraded
Solution Approach 1:
Instead of forming a hole in the lateral arm, the connection function is segmented to the two compression arms that connect at different locations. This avoids creating a weak point in the lateral arm while achieving the same goal of preventing twisting by distributing the load to two connection points.
Solution Approach 2:
The two compression arms act as intermediaries between the stabilizer link and the lateral arm. They transfer the reaction load to the lateral arm at two distinct locations, preventing twisting without requiring a hole in the lateral arm, thus maintaining its rigidity.
3Strength
If the compression arm is bifurcated to connect at two locations, then the lateral arm rigidity is maintained, but the device complexity increases
Solution Approach 1:
The inner compression arm and outer compression arm are merged into a single integrated component rather than being separate parts. This merging reduces the number of components and assembly steps, maintaining lateral arm rigidity through the bifurcated structure while minimizing device complexity.
Data Source
AI summary
A lower arm 13 of a double wishbone type suspension device includes a substantially linear lateral arm 19 of which one end is connected to a vehicle body and the other end is connected to a knuckle 11 and a compression arm 20 of which one end is connected to the vehicle body and the other end is connected to a middle portion of the lateral arm 19 in the vehicle width direction, the lateral arm 19 is connected to a lower end of a stabilizer link 31 at the inside of a hole portion 19a opened to an upper surface of the lateral arm, and the other end of the compression arm 20 is connected to the lateral arm 19 at bifurcated portions 20a and 20b interposing the hole portion 19a from the inside and the outside in the vehicle width direction.