Percussion Piston Valve Housing for Faster Stroke Adjustment
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Solution Overview
Problem
Existing percussion piston devices for percussion drill drives experience delays in adjusting stroke length, leading to inefficient response behavior and increased risk of leaks and mechanical damage due to separate control valve arrangements.
Innovation Solution
Combining the first and second control valves in a common valve housing with a metallic valve block, reducing fluid line paths and volume, and using a cover plate for a robust and leak-resistant design, along with electromagnetic actuation for quick and efficient control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control valve arrangements are used for controlling the percussion piston, then the device complexity is reduced and ease of manufacture is improved, but the response time increases and reliability deteriorates due to longer fluid line paths and increased leak risk
Solution Approach 1:
The patent combines the first control valve and second control valve into a single common valve housing, integrating multiple control functions into one unified structure. This merging eliminates the need for separate control valve arrangements, reducing the number of external hydraulic connections and minimizing fluid line paths. The integrated design improves response time and reliability while maintaining ease of manufacture through modular construction with a valve block and cover plate assembly.
2Reliability
If separate control valve arrangements are used, then device complexity is reduced, but the risk of leaks and mechanical damage increases due to more external connections and hose lines
Solution Approach 1:
By integrating both control valves into a single valve housing with a unified block structure, the patent minimizes the number of external hydraulic connections required. The internal fluid passages are contained within the valve block, eliminating the need for multiple external hose lines and connections that would be required with separate control valve arrangements, thereby reducing leak risk and mechanical damage potential.
Solution Approach 2:
The patent employs a cover plate with sealing elements (O-rings and seals) that closes the valve block, creating a sealed enclosure for the internal fluid passages. This sealed design contains all hydraulic fluid within the robust valve housing structure, eliminating external hose lines and connections that would be vulnerable to leaks and mechanical damage.
3Speed
If a common valve housing is used to combine control valves, then responsiveness is improved due to shorter fluid line paths, but manufacturing complexity increases
Solution Approach 1:
The valve housing is segmented into two main components: a valve block containing the internal fluid passages and control valve mechanisms, and a separate cover plate that seals the assembly. This segmentation allows the complex valve block to be manufactured and tested independently, then assembled with the cover plate using standard sealing techniques, thereby reducing overall manufacturing complexity while maintaining the responsiveness benefits of the integrated design.
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 enhances the responsiveness and adjustability of the percussion piston, providing a more compact, robust, and maintenance-friendly device with reduced risk of leaks and mechanical damage.
Implementation Method 1
a hydraulic fluid supply 30, a hydraulic fluid discharge 40, a first control device 50, through which at least the rear pressure chamber 16 is alternately connected to the hydraulic fluid supply 30 and the hydraulic fluid discharge 40 for effecting a reversing movement of the percussion piston 20
Implementation Method 2
at least one of the control valves (52, 62) has an electrically actuated actuating element, in particular an electromagnetic actuating element (78)
Data Source
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AI summary
The invention relates to a percussion piston device for a percussion drill drive, comprising a percussion piston which is reversibly mounted in a piston housing between a front impact position and a rear retraction position, wherein the percussion piston has at least one front pressure-bearing surface and at least one rear pressure-bearing surface, wherein together with the piston housing at least one front pressure chamber and one rear pressure chamber are formed, a hydraulic fluid supply, a hydraulic fluid discharge, a first control device by which at least the rear pressure chamber is alternately connected to the hydraulic fluid supply and the hydraulic fluid discharge to effect the reversing movement of the percussion piston, and a second control device by which at least one stroke of the percussion piston within the piston housing is adjustable.wherein the first control device comprises a controllable first control valve and the second control device comprises a controllable second control valve. According to the invention, the first control valve and the second control valve are arranged in a common valve housing.