Fastening Device Tolerance Compensation via Threaded Adjusting Nut
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Solution Overview
Problem
Existing fastening devices with tolerance compensation are costly due to complex and expensive components, such as blind rivet nuts with dual threads and adjusting bushes with resilient fingers, which are difficult to produce and require costly materials.
Innovation Solution
A fastening device comprising a blind rivet nut, a threaded adjusting nut, a sleeve-shaped retainer, an adjusting unit with a threaded sleeve, a locating plate, and a driving bush, allowing for automatic tolerance compensation through a releasable coupled connection formed by a fastening screw, using standard and easily producible components with metallic and plastic materials to achieve high connecting strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex components like blind rivet nuts with dual threads and adjusting bushes with resilient fingers are used for tolerance compensation, then tolerance compensation capability is improved, but manufacturing cost increases
Solution Approach 1:
The fastening device is divided into separate functional modules: a fastening element (blind rivet nut) and a separate adjusting element (threaded adjusting nut with threaded sleeve). This segmentation allows each component to be manufactured independently using standard, cost-effective processes rather than requiring complex integrated components with dual threads and resilient fingers.
Solution Approach 2:
A threaded sleeve is introduced as an intermediary component that mediates between the fastening element and the adjusting element. This simple threaded sleeve enables tolerance compensation through straightforward threading operations without requiring complex resilient finger mechanisms or dual-threaded blind rivet nuts.
2Strength
If resilient fingers are used in the adjusting bush to achieve coupled connection, then connection strength is improved, but material cost increases
Solution Approach 1:
The invention replaces expensive resilient finger components with simpler, cheaper threaded connection elements. The threaded adjusting nut and threaded sleeve use standard metallic materials and threading processes that are far more cost-effective than manufacturing resilient fingers from specialized materials while achieving comparable or superior connection strength through mechanical threading.
Solution Approach 2:
The complex resilient finger mechanism is replaced with a pure mechanical threading system. The coupled connection is achieved through the interaction of external and internal threads rather than through elastic deformation of resilient fingers, eliminating the need for costly resilient materials and complex forming processes.
3Ease of manufacture
If standard fastening elements and simple geometric components are used, then ease of manufacture is improved, but tolerance compensation capability may be reduced
Solution Approach 1:
The adjusting element introduces dynamic adjustment capability through the threaded connection. By rotating the threaded adjusting nut within the threaded sleeve, the spacing between components can be dynamically adjusted to compensate for tolerances, maintaining reliability while using simple, standard geometric components that are easy to manufacture.
Solution Approach 2:
Tolerance compensation is achieved by changing the positional parameter of the adjusting element along the threaded axis. The threaded sleeve and adjusting nut allow precise control of the distance between fastening elements through rotational movement, enabling tolerance compensation without requiring complex component geometries.
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 cost-effective fastening device capable of absorbing high connecting forces while maintaining geometric simplicity, allowing for easy assembly and production, with the ability to achieve a strength class of 8 using metallic materials and resilient properties from plastic components.
Implementation Method 1
The adjusting bush is provided with resilient fingers distributed over the periphery which, when the fastening screw is screwed into the adjusting bush, bear against the thread of the screw and form therewith a so-called coupled connection
Data Source
AI summary
A device for fastening components with automatic compensation of tolerances of the spacing therebetween, comprising a base unit including a blind rivet nut securable to one of the components, a threaded adjusting nut and a sleeve-shaped retainer adapted to receive, an adjusting unit including a threaded sleeve, a locating plate and a driving bush connecting the threaded sleeve and the locating plate, the threaded sleeve adapted to be being screwed into the adjusting nut via a first thread pairing of a first thread direction, and a fastening screw which may be screwed into the rivet nut secured to one of the components via a second thread pairing of an opposing second thread direction, forming with the driving bush a releasable connection so that the adjusting unit rotates during rotation of the fastening screw, moving the locating plate into contact with the second component.