Vehicle Housing Bracket Holding Pin Shear Strength
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Solution Overview
Problem
Existing housing-securing units for vehicles face challenges in maintaining assembly integrity and workability after a shock, as the stoppers used to prevent bracket movement from exceeding allowable stress, often requiring increased dimensions or design changes that affect vehicle design and compatibility with existing brackets.
Innovation Solution
A housing-securing unit with a bracket that attaches to the housing via holding pins with inclined approach surfaces and holding surfaces, allowing easy assembly while preventing further movement by fitting into through holes, thus maintaining assembly integrity and workability without altering the vehicle's design or requiring changes to existing brackets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the size of the stopper in the shearing direction is increased to withstand big load caused by shock, then the load resistance is improved, but the whole dimension of the case is increased
Solution Approach 1:
The holding pin utilizes the thickness direction of the bracket as a new dimension to resolve the contradiction. By designing the bracket thickness to be greater than the holding pin diameter, the pin can extend through the bracket thickness, providing sufficient shear strength without increasing the case's planar dimensions. This dimensional transition allows the holding pin to withstand shock loads while maintaining compact case dimensions.
Solution Approach 2:
The invention changes the parameter of bracket thickness to resolve the contradiction. By specifying that the bracket thickness is greater than the holding pin diameter, the design optimizes the load-bearing capacity of the holding pin without requiring larger case dimensions. This parameter adjustment enables the system to withstand shock loads while maintaining compact overall dimensions.
2Strength
If the position of the piece of projection is changed to enlarge the size of the stopper, then the load resistance is improved, but the relative location relation between the case and bracket is changed
Solution Approach 1:
The invention segments the load-bearing function from the positioning function. The holding pin's positioning function is maintained at its original location (fitting into the through hole), while the load-bearing function is enhanced by utilizing the bracket thickness dimension. This segmentation allows the relative location relation to remain unchanged while still achieving improved load resistance.
Solution Approach 2:
The invention resolves the contradiction by transitioning to another dimension (bracket thickness) for load resistance enhancement. The holding pin's diameter and position in the planar view remain unchanged, preserving the relative location relation, while the bracket thickness is optimized to provide sufficient shear strength for withstanding shock loads.
3Shape
If the form of the bracket is changed to maintain the relative location relation, then the position stability is improved, but the device complexity is increased
Solution Approach 1:
The invention changes the parameter of bracket thickness to maintain the relative location relation without altering the bracket's overall form. By optimizing the thickness parameter to be greater than the holding pin diameter, the design achieves both position stability and load resistance while avoiding increases in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances workability during assembly and maintains assembly integrity after attachment, preventing bracket movement while withstanding shocks without increasing the vehicle's dimensions or altering the bracket's design, ensuring compatibility with existing brackets.
Implementation Method 1
The holding pin has an inclined approach surface and at least one holding surface. The inclined approach surface has a height that is increased as extending in the assembling direction, and the tip part of the side support component is firstly in contact with the inclined approach surface when the bracket is attached to the housing.
Implementation Method 2
The holding surface is formed to regulate the side support component from further moving in the assembling direction when the holding pin is fitted to the through hole of the side support component.
Data Source
AI summary
A housing-securing unit for a vehicle includes: a housing in which a circuit board is to be housed; and a bracket through which the housing is mounted to the vehicle. A holding pin having a column shape is provided on a side surface of the housing. The bracket has a side support component in which a through hole is formed for fitting the holding pin. The holding pin has an inclined approach surface having a height that is increased as extending in an assembling direction, and a holding surface formed to regulate the side support component from moving in the assembling direction and to oppose an inner peripheral surface of the through hole when the holding pin is fitted to the through hole. A height of a top part of the holding surface is more than or equal to a height of a top part of the inclined approach surface.