Impact Tool Nested Spring Support for Compact Striking Efficiency
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Solution Overview
Problem
Existing impact tools face challenges in achieving improved striking efficiency while minimizing size increase, which affects their operational effectiveness and usability.
Innovation Solution
The impact tool design incorporates a motor-driven spindle system with a hammer and anvil mechanism, supported by coil springs and a cup washer with support balls, allowing for efficient energy transfer and reduced axial length, thereby enhancing striking efficiency without significant size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the impact tool uses a traditional spring support structure, then the structure is simple, but the axial length increases and striking efficiency decreases
Solution Approach 1:
The cup washer is nested within the recess of the hammer, and the support balls are positioned within the support groove of the hammer. The spring assembly is nested between the cup washer and the flange, creating a compact nested structure that reduces axial length while maintaining functional complexity.
Solution Approach 2:
The support balls transition from a linear support arrangement to a spherical contact point arrangement, changing the dimension of contact from line to point. This allows the springs to be positioned more efficiently in the radial direction rather than extending axially, reducing the overall axial length of the assembly.
2Productivity
If the impact tool increases size for better striking efficiency, then striking efficiency improves, but the tool size increases
Solution Approach 1:
The nested arrangement of the cup washer within the hammer recess and the support balls within the support groove allows the energy transfer mechanism to be compacted. This maintains the necessary stroke length and impact force generation while reducing the overall tool volume and axial length.
Solution Approach 2:
The use of spherical support balls changes the contact geometry parameter from linear to point contact, enabling more efficient space utilization. This allows the spring mechanism to achieve the necessary compression and energy storage in a smaller axial space, improving striking efficiency without increasing tool size.
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
This design improves the striking efficiency of the impact tool by enabling high torque rotation while maintaining a compact size, effectively addressing the need for enhanced operability and efficiency.
Implementation Method 1
a first coil spring and a second coil spring surrounding the spindle shaft
Implementation Method 2
a support ball located in the support groove and supporting the cup washer
Data Source
AI summary
An impact tool has less size increase and improved striking efficiency. An impact tool includes a motor, a spindle rotatable with a rotational force from the motor and including a spindle shaft and a flange, an anvil, a hammer, first and second coil springs surrounding the spindle shaft, a cup washer, and a support ball. The anvil includes an anvil shaft to receive a tip tool and an anvil projection protruding radially outward from the anvil shaft. The hammer includes a hammer projection to strike the anvil projection in a rotation direction, a recess at a rear of the hammer, and a support groove inside the recess. The cup washer is located in the recess and supports front ends of the first and second coil springs. The support ball is located in the support groove and supports the cup washer.