Twin Hammer Impact Tool Rolling Bead Friction Reduction
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Solution Overview
Problem
Conventional twin hammer impact tools experience increased vibration and operational inefficiencies due to the use of needle rollers, which require additional elastic retention rings and have high frictional forces, leading to unsmooth operations and positional deviations.
Innovation Solution
A twin hammer impact tool design incorporating a motor, drive unit, and hammer unit with rolling beads and packing rings that reduce friction and eliminate the need for elastic retention rings, enhancing smoothness and reducing vibration by using rolling beads with small contact areas and a packing ring system to immobilize the outer ring hammer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If needle rollers are used to transmit driving movements between primary and secondary hammers, then rotational inertia is enhanced, but frictional forces become overly high causing unsmooth operation and increased vibration
Solution Approach 1:
The patent replaces the needle roller mechanical system with a rolling element system. The rolling elements are received in roller channels between the primary and secondary hammers, substituting the needle roller contact mechanism with a rolling contact mechanism that reduces frictional forces while maintaining the force transmission function and rotational inertia enhancement.
2Force
If needle rollers are used for transmitting driving movements, then rotational inertia is enhanced, but operational smoothness deteriorates due to high friction and positional deviation
Solution Approach 1:
The patent substitutes the needle roller system with rolling elements that reduce friction and eliminate positional deviation issues. The rolling elements are constrained within roller channels, providing smooth operation while maintaining the rotational inertia benefits of the twin hammer configuration.
3Reliability
If elastic retention rings are added to retain needle rollers, then needle roller retention is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the elastic retention ring component from the system. By using rolling elements within roller channels, the need for separate retention structures is removed, simplifying the overall device structure while maintaining reliable retention of the force transmission elements.
4Ease of manufacture
If needle channels are processed with insufficient accuracy, then manufacturing is easier, but needle rollers swing due to positional deviation causing increased vibration
Solution Approach 1:
The patent replaces the needle roller system with rolling elements in roller channels. This substitution reduces the sensitivity to positional deviation and processing accuracy, allowing easier manufacturing while minimizing the harmful vibration effects that occur when needle rollers swing due to misalignment.
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 tool achieves reduced vibration, improved operational smoothness, and simplified construction by utilizing rolling beads with lower friction and eliminating the need for elastic retention rings, while maintaining high rotational inertia for effective hammering force.
Implementation Method 1
Each of the rolling beads is received within one of the bead grooves and one of the guiding grooves
Implementation Method 2
the conventional single hammer impact tool is generally designed to increase mass so as to improve rotational inertia
Data Source
AI summary
A twin hammer impact tool includes a hammer spindle, an inner ring hammer sleeved on the hammer spindle, an outer ring hammer disposed around the inner ring hammer, and rolling beads. The inner ring hammer has bead grooves each having a ball half-shape, and angularly spaced-apart hammer projections. The inner ring hammer is reciprocally movable relative to the hammer spindle while rotating together with the hammer spindle. The outer ring hammer has guiding grooves. The bead grooves respectively face and open toward the guiding grooves. Each rolling bead is received within one of the bead grooves and one of the guiding grooves. An output hammer has angularly spaced engagement projections to engage the hammer projections.