Torque-Adjustable Pneumatic Tool with Dynamic Piston Assembly
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Solution Overview
Problem
Conventional pneumatic tools have unstable torque output due to unstable compressed air pressure, and lack adjustable torque settings, making them less versatile in use.
Innovation Solution
A torque-adjustable pneumatic tool design featuring a torque adjusting unit with a silencer, piston rod, piston sleeve, and spring, allowing for adjustable discharging gaps to control air flow and torque output through adjustable piston rod and sleeve members, enabling different torque and speed settings without electric components or increased weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional pneumatic tool is used, then structure is simple, but torque output is unstable and not adjustable
Solution Approach 1:
The patent applies the dynamics principle by making the piston rod axially movable relative to the silencer through adjustment members, allowing the discharging gap to be dynamically changed. This enables the torque output to be adjustable while maintaining a relatively simple overall structure, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent applies parameter changes by modifying the axial position of the piston rod to change the discharging gap parameter. This parameter adjustment directly controls the torque output, providing torque adjustability without requiring a completely different structural design, thus balancing adaptability with structural simplicity.
2Reliability
If compressed air pressure is used as power source, then tool is portable, but torque output becomes unstable
Solution Approach 1:
The patent applies self-service by using the piston rod and spring assembly to automatically regulate the discharging gap based on the compressed air pressure variations. The system self-adjusts the torque output without requiring external control mechanisms, thereby improving torque stability while avoiding additional complexity from external control systems.
Solution Approach 2:
The patent implements feedback through the spring mechanism that responds to pressure changes in the compressed air system. The spring automatically adjusts the piston rod position to compensate for pressure fluctuations, creating a feedback loop that stabilizes torque output without requiring complex electronic control systems.
3Adaptability or versatility
If fixed torque output is used, then device is simple, but cannot perform different locking stages
Solution Approach 1:
The patent applies dynamics by enabling the piston rod to be adjusted to different axial positions, creating variable discharging gaps that correspond to different torque levels. This allows the tool to perform multiple locking stages with a simple adjustment mechanism, resolving the contradiction between multi-stage capability and device complexity.
Solution Approach 2:
The patent applies segmentation by dividing the torque adjustment function into separate adjustable components (piston rod, adjustment members, spring). This modular segmentation allows independent adjustment of torque parameters without affecting the entire device structure, enabling multi-stage locking capability while maintaining overall device simplicity.
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 adjustable torque and speed settings at different operation stages, enhancing versatility and usability without adding weight or complexity, by modifying existing pneumatic tools to control air flow effectively.
Implementation Method 1
The spring (35) is mounted around the piston sleeve (33) and has two ends abutting respectively the piston sleeve (33) and the silencer (31)
Implementation Method 2
When the trigger assembly (73) is pressed, the compressed air will be led into the holding chamber (711) to actuate the driving device (72)
Implementation Method 3
The piston sleeve (33) is mounted around the piston rod (32) and is axially moveable relative to the piston rod (32)
Data Source
AI summary
A pneumatic tool has a body and a torque adjusting unit. The body has a trigger chamber, a trigger assembly, an inlet channel, and an outlet channel. The torque adjusting unit is connected with a bottom of the body, is mounted on one end of the outlet channel, and has a silencer, a piston rod, a piston sleeve, and a spring. The silencer is mounted detachably on the bottom of the body and having a discharging chamber. The piston rod is connected adjustably with the silencer and extends into the discharging chamber. The piston sleeve is mounted around the piston rod and is axially moveable relative to the piston rod. The spring is mounted around the piston sleeve and has two ends abutting respectively the piston sleeve and the silencer.