Electric Motor Spoke Ejection Gun for Quiet, Adaptive Operation
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Solution Overview
Problem
Existing spoke ejection devices for spoked wheels face issues with non-optimized piston movements, noise pollution, and inability to accommodate different spoke sizes, leading to inefficiencies and increased production costs.
Innovation Solution
An electric motor-driven axial thrust system with adjustable piston movement and a radial thrust system for orientation control, combined with detection means, to optimize spoke ejection and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pneumatic or hydraulic control devices are used to drive the piston system, then the ejection operation can be carried out quickly and automatically, but the ejection movements of the piston system are not optimized and the devices are noisy
Solution Approach 1:
The patent replaces the pneumatic or hydraulic control system with an electric motor-driven system. The electric motor (20) directly drives the piston (13) through a transmission mechanism, eliminating the need for compressors, hydraulic pumps, and associated control valves that generate noise. This substitution maintains automated operation while significantly reducing noise levels and allowing for optimized piston movement profiles.
Solution Approach 2:
The electric motor enables precise control of piston movement parameters including speed, acceleration, and stroke length. The control system can adjust these parameters to optimize ejection for different spoke sizes, something difficult to achieve with fixed pneumatic/hydraulic systems. The motor's variable speed capability allows the piston to return a necessary and sufficient distance based on spoke length, reducing production time.
2Device complexity
If fixed piston movement is used in ejection devices, then the device structure is simple, but the device cannot accommodate spokes of different sizes
Solution Approach 1:
The patent implements dynamic piston movement control through the electric motor and control system. The piston stroke length and speed are variable rather than fixed, allowing the system to adapt to different spoke sizes. The control system adjusts the piston's return distance based on the length of the spoke being ejected, optimizing each ejection cycle without requiring physical reconfiguration of the device.
Solution Approach 2:
The electric motor-driven piston system serves multiple functions: it can eject spokes of various lengths, control ejection speed, and adjust stroke length. This single system replaces what would otherwise require multiple fixed-settings mechanisms or manual adjustments, providing universal adaptability across different spoke specifications while maintaining relatively simple device architecture.
3Device complexity
If the bent end of the spoke is not controlled during ejection, then the ejection process is simple, but the spoke can jam due to improper orientation
Solution Approach 1:
The patent employs a radial thrust system that acts on the spoke before and during the axial ejection process. This radial thrust component preliminarily positions and orients the bent end of the spoke, ensuring proper alignment with the hub hole before the main ejection force is applied. This preliminary orientation action prevents jamming without requiring complex post-ejection adjustment mechanisms.
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 system enables precise and quiet spoke ejection adaptable to various sizes, reducing production time and costs while improving productivity.
Implementation Method 1
the axial thrust system is moved by an electric motor
Implementation Method 2
an axial thrust system comprising a piston movable in the barrel to exert an axial thrust force at the head of the spoke to eject the spoke
Implementation Method 3
the device includes a radial thrust system for the spoke. In this way, the combination of axial support against the spoke head, and a radial thrust force from the spoke, makes it possible to force the bent part to orient itself
Data Source
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Figure 3~4
Figure 5
AI summary
The invention relates to a device (1) for ejecting a spoke (2) into a hole in a hub of a spoke wheel (2), the device (1) comprising a barrel (3) into which a spoke (2) having a bent portion (20) provided with a head (21) is inserted, the device (1) comprising an axial thrust system (4) having a piston (40) which is movable in the barrel (3) so as to exert an axial thrust force (4) at the head (21) of the spoke (2) in order to eject the spoke (2). According to the invention, the axial thrust system (4) is moved by an electric motor (5).