Vehicle Suspension Hanger with Arcuate Path for Tie-Down Hook

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Solution Overview

Problem

Existing supporting structures for leaf springs in vehicles face integrity and durability issues due to changes in loading conditions and moments applied during normal running or parking, particularly when external forces are applied through tie-down hooks.

Innovation Solution

A supporting structure with a proximal end attached to the vehicle body at a central axis and a distal end featuring an arcuate hanger that allows the tie-down hook to move in a circular path, reducing load and moment transmission and enhancing durability by aligning external forces with the central axis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional supporting member structure is used to secure the leaf spring, then the basic support function is achieved, but undesired loads and moments are applied to the supporting member when external forces are applied through tie-down hooks, compromising integrity and durability

Engineering Contradiction:
Improveintegrity and durability of supporting memberVSAvoidundesired loads and moments on supporting member
Core Design Contradiction:
ReliabilityVSForce

Solution Approach 1:

The hanger is configured with a circular arcuate path centered at the central axis of the supporting member. This curved geometry allows the tie-down hook to move along an arc during loading, ensuring that external forces are directed toward the central axis rather than creating eccentric loads. The circular path design transforms potentially harmful lateral forces into axial forces that the supporting member can better withstand, thereby improving reliability while reducing undesired moments.

Inventive Principle:
Principle #14Spheroidality (Curvature)

Solution Approach 2:

The hanger is designed to allow dynamic movement of the tie-down hook along the circular arcuate path rather than fixing it in a rigid position. This dynamic capability enables the system to adapt to varying loading conditions and directions, allowing the hook to naturally follow the arc as forces are applied. This movement ensures that loads are consistently directed toward the central axis, reducing undesired moments and improving the supporting member's durability under varying external forces.

Inventive Principle:
Principle #15Dynamics

2Reliability

If the tie-down hook is fixed in a rigid position on the supporting member, then structural simplicity is maintained, but rotation moments are generated when external forces are applied, compromising the durability of the leaf spring and supporting members

Engineering Contradiction:
Improvedurability of leaf spring and supporting membersVSAvoidcomplexity of hanger structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The hanger incorporates a circular arcuate path geometry that is relatively simple to manufacture while effectively preventing rotation moments. The curved path design allows the tie-down hook to move in an arc centered at the central axis, ensuring that external forces are directed toward the axis rather than creating eccentric moments. This geometric solution achieves the durability benefit without requiring complex mechanical mechanisms, maintaining reasonable structural simplicity.

Inventive Principle:
Principle #14Spheroidality (Curvature)

Solution Approach 2:

The hanger provides dynamic movement capability along the circular arcuate path without requiring complex actuation mechanisms. The simple curved guide structure allows the tie-down hook to naturally follow the arc under load, automatically directing forces toward the central axis. This passive dynamic behavior achieves the desired durability improvement while keeping the device complexity low, as no additional actuators or control systems are needed.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS8177244B2Supporting structure for vehicle suspension component
Publication Date: 2012.05.15 NISSAN MOTOR CO LTD
  • US8177244B2 patent drawing
  • US8177244B2 patent drawing
  • US8177244B2 patent drawing

AI summary

A vehicle suspension includes a vehicle body, a supporting member, wherein a proximal end is attached to the vehicle body at a central axis. The supporting member is configured to secure an end of a vehicle suspension component to the vehicle body. A distal end of the support member includes a hanger configured to receive and to allow a tie-down hook to move in an arcuate path defined by a circle centered at the central axis.