Vehicle Subframe Mounting Bracket for Compact Double Wishbone Suspension
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Solution Overview
Problem
The existing double wishbone suspension system in vehicles faces challenges in compact passenger vehicles due to space constraints, limited design freedom, and restrictive assembly processes, which hinder the securement of a suitable upper arm length and rigidity, especially when trying to integrate it with compact vehicle designs.
Innovation Solution
A vehicle subframe structure with a mounting bracket that allows the upper arm to be pivotally coupled, enabling a 'V'-shaped configuration and improved assembly by pre-mounting the upper arm on the subframe, which simplifies the assembly process and enhances rigidity by fixing the mounting portion to a side member of the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a double wishbone type suspension is used to achieve high rigidity and good vibration insulation, then control stability and vibration insulation are improved, but the space required increases making it unsuitable for compact passenger vehicles
Solution Approach 1:
The upper arm is repositioned from a traditional side-member mounting location to a mounting bracket on the subframe, utilizing the vertical dimension above the subframe. This dimensional relocation allows the suspension geometry to maintain double wishbone characteristics while reducing the lateral space required in the engine room.
2Strength
If the upper arm is mounted to a side member of the vehicle body to secure rigidity, then coupling rigidity is improved, but the wheel hub size and arrangement are restricted limiting design freedom
Solution Approach 1:
The mounting function is segmented from the vehicle body side member to a dedicated mounting bracket on the subframe. This separation allows the upper arm to be coupled to the subframe rather than directly to the side member, providing independent optimization of both the suspension mounting location and the vehicle body structure.
Solution Approach 2:
The subframe acts as an intermediary structure between the vehicle body and the upper arm. The mounting bracket on the subframe provides the coupling point for the upper arm, while the subframe itself is mounted to the side member, thus mediating the connection and allowing flexible wheel hub positioning.
3Manufacturing precision
If the upper arm length is increased to achieve suitable wheel alignment, then wheel alignment control is improved, but the space required in the engine room increases
Solution Approach 1:
By relocating the upper arm mounting point to the subframe's mounting bracket, the upper arm can achieve its required length and geometry without extending as far laterally into the engine room. The vertical positioning on the subframe allows the upper arm to span the necessary distance for proper wheel alignment while maintaining compact lateral dimensions.
Data Source
AI summary
A structure of a vehicle subframe mounted to a vehicle, in which a wheel hub may be connected to a vehicle body through a lower arm and an upper arm disposed below and above one another, and in which the lower arm may be coupled in a traverse direction of the vehicle may include a plate-shaped body mounted to a lower portion of the vehicle body, and having the lower arm mounted thereon in the traverse direction of the vehicle, and a mounting bracket protruding from the body upwards wherein the upper arm may be pivotally coupled to an upper portion of the mounting bracket.