Elastic Blind Rivet Sleeve for Stable Clamping Under Thermal Cycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Blind rivets with spring seat sleeves fail to maintain a reliable clamping force across varying temperatures, leading to potential cracking and loss of clamping force, which can cause defocusing or positional changes in components like light sources in headlamps.
Innovation Solution
A rivet sleeve with an elastic sleeve die head and a tubular design featuring recesses on its lateral surface, which maintains a stable clamping force over a wide temperature range by preventing crack formation and ensuring continuous clamping force through elastic deformation without plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blind rivet with a spring seat sleeve is used to connect components, then the components can be securely held, but cracks may form in the sleeve die head during frequent temperature changes, resulting in loss of clamping force
Solution Approach 1:
The patent changes the material parameter of the sleeve die head from conventional rigid material to elastic material. This allows the sleeve die head to undergo elastic deformation during temperature changes rather than cracking, while still maintaining the clamping force on the components. The elastic material's ability to reversibly deform resolves the contradiction between maintaining reliability and resisting strength loss from cracking.
Solution Approach 2:
The patent employs composite material construction where the blind rivet system combines different materials with complementary properties: the elastic sleeve die head material provides crack resistance through elastic deformation, while the overall rivet structure maintains securing capability. This composite approach allows simultaneous achievement of crack resistance and reliable component holding.
2Ease of manufacture
If the sleeve die head is made rigid to maintain structural integrity, then manufacturing is simpler, but it cannot adapt to temperature changes without cracking
Solution Approach 1:
The patent changes the material parameter from rigid to elastic, which fundamentally alters both manufacturability and temperature adaptability. The elastic material can be formed into the required shape and then naturally adapts to temperature variations through elastic deformation, eliminating the need for complex thermal compensation designs while maintaining structural integrity across temperature ranges.
Solution Approach 2:
The patent introduces dynamic adaptability to the sleeve die head by using elastic material that can dynamically adjust its shape in response to temperature changes. This dynamic behavior allows the component to adapt to varying thermal conditions without cracking, while the basic elastic component structure remains relatively simple to manufacture.
3Adaptability or versatility
If the blind rivet components have different coefficients of thermal expansion, then they can be made from different materials for optimal performance, but they expand to different degrees during temperature changes, potentially causing loss of clamping force
Solution Approach 1:
The patent changes the material parameter of the sleeve die head to elastic material, which fundamentally alters the thermal expansion behavior. The elastic material can accommodate differential thermal expansion between components through elastic deformation, maintaining contact pressure and clamping force consistency even when other components expand at different rates. This allows continued use of different materials for optimal performance while ensuring clamping force reliability.
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 provides a stable blind rivet that maintains a consistent clamping force from -40°C to +80°C, preventing crack formation and ensuring minimal defocusing or positional changes in components, thus ensuring reliable component connection.
Implementation Method 1
the sleeve die head is made of an elastic material and has at least two recesses spaced a distance apart in the lateral surface of the sleeve die head
Implementation Method 2
The blind rivet and the components to be connected may have different coefficients of thermal expansion, so that, in the case of a temperature change, they expand to different degrees
Implementation Method 3
the sleeve die head also has at least two recesses spaced a distance apart in the lateral surface of the sleeve die head... the occurrence of cracks in the sleeve die head of the rivet sleeve in the closed state, due to frequent positive as well as negative temperature changes may be mitigated
Data Source
AI summary
A rivet sleeve of a blind rivet for connecting at least one die-head-side component to a closing-head-side component, the rivet sleeve having a sleeve shank including a sleeve shank end. An elastic sleeve die head is arranged at an end of the sleeve shank opposite the sleeve shank end for ensuring a minimum clamping force between at least the die-head-side component and the closing-head-side component in a closed state of the blind rivet, the sleeve die head. The sleeve die head extend around the sleeve shank radially around the extension axis of the sleeve shank. At least two recesses spaced a distance apart in the lateral surface of the sleeve die head.