Vehicle Push Nut Structure for Reusable Secure Fastening
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Solution Overview
Problem
Conventional push nuts for vehicles suffer from deformation and damage during assembly due to the fixed hook jaw design, making them difficult to disassemble and reuse during maintenance.
Innovation Solution
The push nuts feature a connecting bridge with elastic deformation, supported by axial force supports with sloped contact surfaces and tapped internal walls, allowing the body to be inserted and removed without deforming, and preventing damage from excessive fastening by using a screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hook jaw is fixedly formed protruding at the left and right side of the body, then the push nut can be securely fixed in the member hole, but the hook jaw becomes deformed because it contacts with the internal wall of the hole, causing deformation and damage to areas around the member
Solution Approach 1:
The hook jaw is changed from a fixed rigid structure to a movable structure that can change its position and orientation. The rotation support allows the hook jaw to rotate and adjust its angle, changing the contact parameters with the member hole wall from point contact to line contact, distributing the stress and preventing deformation
Solution Approach 2:
The hook jaw is made dynamic by introducing the rotation support, allowing it to rotate and adjust its position during insertion and fixation. This dynamic adjustment enables the hook jaw to adapt to the hole geometry and distribute contact forces, preventing the deformation and damage caused by static fixed hook jaws
2Reliability
If the body is inserted into the hole of the member and becomes fixed by the hook jaw such that it does not fall out, then the push nut is securely mounted, but it is difficult to perform repair because the push nuts cannot be separated from the member
Solution Approach 1:
The connecting bridge is designed with elastic deformation capability, making it a dynamic structure that can reversibly change shape. During installation, the bridge deforms elastically to allow passage through the hole; during removal, the elastic deformation allows the bridge to expand and release the hook jaw from the hole, enabling easy disassembly while maintaining secure mounting during use
Solution Approach 2:
The connecting bridge changes its physical state between deformed and undeformed configurations. When deformed, it allows the hook jaw to pass through the hole; when undeformed, it provides the elastic force to hold the hook jaw in position. This parameter change enables both secure mounting and easy removal
3Reliability
If the body is inserted into the hole formed in the member, then the push nut blocks gaps for dustproof and waterproof effects, but the hook jaw contacts with the internal wall of the hole causing deformation
Solution Approach 1:
The hook jaw rotates to change its contact parameters with the member hole wall. By rotating to an optimal angle, the contact is transformed from point contact (which causes deformation) to line contact or distributed contact, maintaining the sealing effect while reducing localized stress and preventing deformation of both the hook jaw and member
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
This design enables easy assembly and disassembly of push nuts, preventing deformation and damage, and allows for reuse by maintaining the seal without falling out, while preventing deformation in the surrounding area and excessive fastening.
Implementation Method 1
the body 120 and the head 110 are connected by a connecting bridge 160 that has an elastic deformation outwardly
Implementation Method 2
an upper portion of the contact surface 141 of the head axial force support 140 and a lower portion of the contact surface 131 of the body axial force support 130 have rotation direction supports 131a, 141a respectively formed in a slope in order to prevent deformation due to excessive fastening with a fastening member 400 such as a screw
Data Source
AI summary
Push nuts for cars, comprising a head having a member contact surface formed protruding in left and right sides, and having a fastening hole formed penetrating at the center; and a body having formed penetrating at the center, a fastening hole having the same inner diameter and center as the fastening hole which is formed at the head, characterized in that the body and the head are connected to a connecting bridge that elastic deformation is performed outwards, and the head and the body connected with the connecting bridge respectively have a head axial force support and a body axial force support formed protruding toward a space, the head axial force support and the body axial force support having fastening holes having the same center as the fastening holes respectively formed penetrating.