Hydraulic Torque Wrench Valve Adjusting Striking Accuracy
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Solution Overview
Problem
Conventional hydraulic torque wrenches face issues with large errors between set and actual striking torque, high initial torque, long torque generation cycles, high resistance, and poor durability, especially during reverse rotation and due to susceptibility to oil quantity fluctuations.
Innovation Solution
A striking torque adjustment device with a cylindrical valve element having a cutout portion, offset center of gravity, and supported by steel balls, which adjusts the hydraulic fluid flow path dynamically through centrifugal and inertial forces, eliminating the need for springs and allowing efficient energy use regardless of oil pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional output adjustment mechanism with a fixed hydraulic fluid flow path size is used, then the device structure is simple, but the error between actually generated striking torque and set striking torque is large
Solution Approach 1:
The patent applies the dynamics principle by making the hydraulic fluid flow path size variable rather than fixed. The output adjustment mechanism dynamically changes the flow path cross-sectional area based on operating conditions, allowing the system to adapt and maintain accurate striking torque across different operation phases. This dynamic adjustment resolves the contradiction by enabling high accuracy without requiring an overly complex multi-component mechanism.
Solution Approach 2:
The patent employs parameter changes by modifying the hydraulic fluid flow path characteristics (cross-sectional area) as a variable parameter. By changing this physical parameter in response to operational needs, the system achieves precise control over striking torque magnitude. This approach allows accurate torque generation while keeping the overall mechanism relatively simple, as it relies on a single adjustable parameter rather than multiple complex components.
2Measurement precision
If the hydraulic fluid flow path is restricted to control striking torque magnitude, then the striking torque accuracy improves, but the generation cycle of striking torque becomes long
Solution Approach 1:
The patent resolves this contradiction through dynamic adjustment of the hydraulic fluid flow path size. During different phases of operation, the flow path cross-sectional area is automatically varied - restricted when precision is needed and enlarged when speed is needed. This dynamic behavior allows the system to achieve both accurate striking torque control and short generation cycles by adapting the flow path size to real-time operational requirements.
Solution Approach 2:
The patent applies periodic action by cycling the hydraulic fluid flow path size between restricted and enlarged states during operation. This periodic variation in flow path characteristics enables the system to alternate between precision mode (restricted flow) and speed mode (enlarged flow), thereby achieving both accurate striking torque and short generation cycles through rhythmic parameter adjustment.
3Productivity
If the hydraulic fluid flow path is enlarged to shorten generation cycle, then the productivity improves, but the error between actually generated striking torque and set striking torque becomes large
Solution Approach 1:
The patent uses dynamics to resolve this contradiction by making the flow path size a variable parameter that automatically adjusts based on operational phase. When high productivity is needed, the flow path is enlarged to allow rapid fluid movement and short generation cycles. When precision is required, the flow path is restricted to maintain accurate torque control. This dynamic adaptation eliminates the need to choose between speed and accuracy.
Solution Approach 2:
The patent employs parameter changes by varying the hydraulic fluid flow path cross-sectional area according to operational requirements. This parameter adjustment enables the system to switch between different performance modes - using larger flow paths for speed and smaller flow paths for precision - thereby achieving both short generation cycles and high striking torque accuracy without compromise.
4Ease of operation
If a spring-based output adjustment mechanism is used, then the striking torque can be adjusted, but the durability becomes poor
Solution Approach 1:
The patent applies the taking out principle by removing the spring component from the output adjustment mechanism. Instead of using a spring-based system that suffers from durability issues, the patent extracts this problematic element and replaces it with a direct hydraulic control mechanism. This elimination of the spring while retaining torque adjustability capability resolves the contradiction between ease of operation and durability.
Solution Approach 2:
The patent employs mechanics substitution by replacing the mechanical spring-based adjustment mechanism with a hydraulic control system. The hydraulic mechanism uses fluid pressure and flow control to achieve torque adjustment without relying on elastic mechanical components. This substitution maintains the adjustability function while dramatically improving durability by eliminating the wear-prone spring elements.
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
Improves the accuracy and speed of striking torque generation, enhances durability, and reduces energy consumption while minimizing impact from oil quantity fluctuations, enabling efficient operation in both tightening and loosening directions.
Implementation Method 1
the rotational position of the valve element changes inside the cylinder portion by means of centrifugal force caused by the revolution of the valve element obtained from rotation of said liner
Implementation Method 2
an inertial force caused by the rotation of the valve element obtained from the sudden braking of the liner at the time of generation of the pulse
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
[Object] To provide a striking torque adjustment device of a hydraulic torque wrench which makes it possible to improve the accuracy of the magnitude of the striking torque generated by a striking torque generation device of the hydraulic torque wrench, shorten the generation cycle of the striking torque, and furthermore improve the durability and energy efficiency of the striking torque generation device of the hydraulic torque wrench, as well as making the device less susceptible to fluctuation in oil quantity. [Means for Solving] A liner 7 is provided with a cylinder portion 14a is formed in parallel to the rotation axis, and also a hydraulic fluid flow path 14c is formed which opens to a cylinder portion 14a to communicate with the interior of the liner serving as a high-pressure chamber and a low pressure chamber at the time of occurrence of the striking torque, and an automatic relief mechanism 14 is provided in which a cylindrical valve element 14b having a cutout portion 14b' serving as a flow path for hydraulic oil formed on the outer peripheral surface portion is disposed inside the cylinder portion 14a so as to be freely rotatable.