Steering Clutch Pressure Control for Sealing Ring PV Limits
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Solution Overview
Problem
Existing work vehicles with hydraulic steering clutches face challenges in maintaining a compact design that applies pressure hydraulically while preventing the sealing ring's PV value from reaching its maximum permissible value, leading to inefficiencies and potential leakage.
Innovation Solution
A work vehicle monitoring system that includes a controller to manage hydraulic fluid pressure and rotational speed, ensuring the PV value of the sealing ring does not exceed the maximum permissible value by adjusting the pressure based on rotational speed thresholds, and outputs maintenance information for timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic pressure is applied to engage the steering clutch, then the clutch engagement force is improved, but the PV value of the sealing ring increases and may reach the maximum permissible value
Solution Approach 1:
The patent implements dynamic pressure control where the hydraulic pressure supplied to the steering clutch is adjusted based on the rotational speed of the rotary member. When rotational speed is high, the pressure is reduced to keep the PV value within permissible limits, while when rotational speed is low, the pressure can be higher to ensure adequate clutch engagement force. This dynamic adjustment resolves the contradiction between maintaining sufficient engagement force and preventing excessive PV values that would damage the sealing ring.
Solution Approach 2:
The system changes the hydraulic pressure parameter according to the operational conditions (rotational speed). By varying the pressure parameter dynamically rather than maintaining a constant high pressure, the system achieves both adequate clutch engagement when needed and protective PV value management for the sealing ring during high-speed operation.
2Reliability
If the clutch structure includes springs for pressing clutch plates, then the clutch engagement reliability is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical spring-based pressing mechanism with a hydraulic pressure system. Instead of using springs to press the clutch plates, hydraulic fluid pressure is supplied to the clutch to achieve engagement. This substitution eliminates the need for complex spring mechanisms while maintaining reliable clutch engagement, thereby reducing device complexity while preserving engagement reliability.
3Reliability
If hydraulic fluid pressure is increased to ensure clutch engagement, then the clutch transmission reliability is improved, but the PV value of the sealing ring reaches the maximum permissible value
Solution Approach 1:
The system dynamically adjusts hydraulic pressure based on rotational speed conditions. During high-speed operation, pressure is automatically reduced to prevent excessive PV values that would harm the sealing ring, while during low-speed operation, pressure is maintained or increased to ensure reliable clutch transmission. This dynamic control strategy resolves the contradiction between transmission reliability and sealing ring protection.
Solution Approach 2:
The pressure control system incorporates feedback from rotational speed sensing to automatically adjust the hydraulic pressure supplied to the clutch. The system monitors the operational state and adjusts pressure accordingly, ensuring that clutch transmission reliability is maintained when needed while preventing harmful PV values during high-speed operation, thus resolving the contradiction between these two requirements.
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 system effectively manages hydraulic fluid pressure to prevent excessive PV values, enhancing the operational efficiency and longevity of the sealing rings by providing timely maintenance notifications.
Implementation Method 1
it is necessary to provide a sealing ring to prevent the hydraulic fluid from seeping out at the connected part of the hydraulic fluid supply channel between the support member and the rotary member
Implementation Method 2
a low hydraulic pressure state results in an engaged state, while a state in which the hydraulic pressure is equal to or greater than a specific level results in a disengaged state
Implementation Method 3
The rotational speed sensor senses a rotational speed of the rotary member
Data Source
AI summary
A work vehicle monitoring system includes a work vehicle and a monitoring device provided on an exterior of the work vehicle. The work vehicle includes a steering clutch, a rotary member having a first hydraulic fluid supply channel, a drive unit, a support member having a second hydraulic fluid supply channel, a sealing ring disposed between the first hydraulic fluid supply channel and the second hydraulic fluid supply channel, a controller that controls a pressure of a hydraulic fluid inside the first hydraulic fluid supply channel and the second hydraulic fluid supply channel, and an external output component that outputs data related to the pressure, a rotational speed, and a time. The monitoring device accepts the data from the external output component and outputs maintenance information about the sealing ring when a predicted wear amount of the sealing ring obtained from the determination basis data exceeds a specific threshold.