Impact-Driven Tool Valve Body Dimensionality Change
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Solution Overview
Problem
Existing impact-driven tools face challenges with increased size, weight, and flow resistance due to the need for multiple annular grooves and larger diameters in switching valves, which complicates control and reduces striking efficiency.
Innovation Solution
A configuration that includes a cylinder with a large-diameter piston and a communication path with a vertical hole, allowing the upper and lower chambers to communicate directly, eliminating the need for annular grooves and reducing the valve body's length and diameter, while maintaining sufficient flow channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple annular grooves are provided in the valve body to maintain sufficient flow channels, then the flow channels are sufficient, but the total length of the switching valve is increased
Solution Approach 1:
The patent transitions from using multiple annular grooves arranged axially (one-dimensional arrangement) to a single through-hole with radial branches (two-dimensional/three-dimensional arrangement). The communication path extends radially from the axis of the valve body, allowing sufficient flow channel volume without increasing axial length.
2Productivity
If the diameter of the valve body is increased to form deep annular grooves, then the striking efficiency is improved, but the length and weight of the valve body are both increased
Solution Approach 1:
Instead of increasing valve body diameter to create deep annular grooves, the patent uses a through-hole extending axially with radial branches extending perpendicular to the axis. This three-dimensional configuration provides sufficient flow channel volume and improved striking efficiency without increasing the outer diameter or weight of the valve body.
3Productivity
If the length of the stroke is increased to improve striking efficiency, then the striking efficiency is improved, but the length and weight of the valve body are both increased
Solution Approach 1:
The patent achieves improved striking efficiency by optimizing the radial and axial dimensions of the communication path branches rather than increasing the overall stroke length. The radial branches provide sufficient flow area without extending the axial stroke, maintaining compact valve body length while improving hydraulic flow characteristics for better striking efficiency.
4Quantity of substance
If annular grooves are provided in the valve body, then flow channels are established, but flow resistance is increased to inhibit smooth flow of the hydraulic oil
Solution Approach 1:
The patent replaces annular grooves (which create flow resistance due to their confined geometry) with a through-hole configuration that allows hydraulic oil to flow freely axially and radially. The communication path with radial branches provides unobstructed flow channels with minimal flow resistance, establishing sufficient flow channels without the harmful flow resistance characteristic of annular grooves.
5Quantity of substance
If the inner diameter of the valve body is increased to maintain sufficient flow channels, then the flow channels are sufficient, but the outer diameter is increased causing oil leakage
Solution Approach 1:
The patent achieves sufficient flow channel volume through a three-dimensional communication path configuration (axial through-hole with radial branches) rather than increasing the inner diameter. This maintains a compact valve body outer diameter that prevents oil leakage while providing adequate flow channels through optimized internal geometry.
6Ease of operation
If the machining accuracy of the groove portions is enhanced, then the sliding of the valve body is not hindered, but the fabrication is time consuming
Solution Approach 1:
The patent replaces complex annular grooves requiring high machining accuracy with a through-hole configuration with radial branches. This simpler geometry is easier to machine with standard drilling and boring operations, reducing fabrication time while still providing smooth surfaces that enable proper valve body sliding through the communication path.
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 configuration reduces the weight and length of the valve body, improving control and striking efficiency by minimizing flow resistance and preventing oil leakage, leading to more stable and efficient operation.
Implementation Method 1
a high-pressure gas in a gas chamber formed above the piston is compressed during the rising process to store the energy, and the piston is lowered by the energy derived from expansion of the above-described gas to strike the upper end of a chisel
Implementation Method 2
a spool type in which the valve body is in the form of a round shaft, an annular groove is formed in the outer circumference of the valve body, the annular groove is displaced in the axial direction by the upward and downward movement of the valve body, and the flow channels of a hydraulic oil are thereby switched
Data Source
AI summary
An impact-driven tool includes a cylinder and a piston slidably inserted into the cylinder and has a large-diameter portion. The cylinder includes: a chamber on one end side; a chamber on the other end side; a communication path that allows the chamber on one end side and the chamber on the other end side to communicate with each other; and a valve chamber that is continuous with one end side in the axial direction of the communication path, and a valve body for piston lifting control that is incorporated so as to be movable up and down and is provided in the valve chamber.