Two-Piece Threaded Fastener Assembly for Tight Installation Spaces
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Solution Overview
Problem
Existing threaded fasteners, such as lug bolts, often require more space than is available for installation, necessitating the removal of additional components or modifications to the wheel hub.
Innovation Solution
A two-piece threaded fastener assembly comprising a shaft head and a separate shaft, where the shaft head includes a fixing segment with an internally-threaded portion and a spline, and the shaft has externally-threaded portions for cooperation with the shaft head and a nut, allowing for secure assembly without the need for extensive space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional one-piece threaded fastener is used, then the fastening function is reliable, but the installation space required is excessive
Solution Approach 1:
The threaded fastener is divided into two separate pieces: a shaft head portion and a shaft portion. The shaft head portion includes a head with an internally-threaded portion, while the shaft portion includes externally-threaded portions. These two pieces are assembled together to form the complete fastener, allowing installation in restricted spaces while maintaining structural integrity and fastening reliability.
2Length of stationary object
If the fastener length is reduced to fit the space, then the installation becomes feasible, but the fastening strength is insufficient
Solution Approach 1:
The shaft portion is inserted into and nested within the shaft head portion. The externally-threaded portion of the shaft fits into the internally-threaded portion of the shaft head, creating a nested configuration that maximizes the use of available space while maintaining the necessary thread engagement length for adequate fastening strength.
3Ease of operation
If additional components are removed to create space, then the fastener can be installed, but the device complexity and risk of damage increase
Solution Approach 1:
By segmenting the fastener into two pieces that can be assembled together, the invention allows the shaft head portion to be installed first in the restricted space, followed by the shaft portion. This eliminates the need to remove additional components or modify the wheel hub, simplifying the installation process and reducing the risk of damage to surrounding components.
Data Source
AI summary
A threaded fastener assembly for use with a nut includes a shaft head and a separate shaft. The shaft head includes a head, and an internally-threaded portion. The shaft has a first externally-threaded portion for cooperation with the internally-threaded portion of the shaft head to selectively secure the shaft to the shaft head, a second externally-threaded portion for cooperation with the nut, and an integrated nut or wrenching portion for tightening the shaft to the shaft head.