Hydraulic Cylinder Check Valve for Cold-Start Positioning Stability
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Solution Overview
Problem
Hydraulic actuators in harvester heads face difficulties in low temperature conditions due to viscous hydraulic oil, leading to unstable positioning and decreased control, as the hydraulic medium fails to reach a working temperature, causing inefficiencies in forestry and construction machines.
Innovation Solution
A hydraulic actuator design with a cavity and check valve system that allows continuous flow of hydraulic medium between the cylinder and piston rod chambers, enabling temperature increase and improved viscosity, along with an additional hydraulic connection for heat exchange, ensuring precise pressure control and faster temperature change, even when the actuator is not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic actuators are used in low temperature conditions, then the harvester head can operate in various weather conditions, but the hydraulic oil becomes viscous leading to unstable positioning and decreased control
Solution Approach 1:
The patent changes the temperature parameter of the hydraulic medium by introducing a heating element and thermal insulation. The heating element raises the temperature of the hydraulic oil from low temperature (causing high viscosity) to operating temperature (reducing viscosity), while thermal insulation maintains this temperature. This parameter change resolves the contradiction by enabling the system to adapt to low temperature environmental conditions while maintaining reliable positioning stability through controlled hydraulic fluid properties.
Solution Approach 2:
The patent applies preliminary action by pre-heating the hydraulic oil before it reaches the actuator through a heating element in the hydraulic line. This preliminary heating action ensures that the hydraulic medium arrives at the actuator at the correct temperature, preventing viscosity-related positioning issues before they occur, thus maintaining reliability while adapting to cold environmental conditions.
2Ease of manufacture
If hydraulic oil volume in lines exceeds actuator working volume, then the system can be designed with standard hydraulic lines, but the excess oil remains static and cold affecting control
Solution Approach 1:
The patent applies continuity of useful action by ensuring continuous circulation of the hydraulic medium through the actuator. The system is designed so that hydraulic oil continuously flows through the actuator chambers and returns to the reservoir, preventing static conditions. This continuous circulation ensures that all hydraulic oil, including the excess volume in lines, maintains operating temperature and viscosity, preserving control precision while allowing the use of standard hydraulic line designs.
3Reliability
If hydraulic medium flow is increased to improve temperature, then the temperature increase improves viscosity and control, but the hydraulic system requires more energy
Solution Approach 1:
The patent changes the temperature parameter of the hydraulic medium using a heating element and thermal insulation rather than increasing flow rate. By heating the hydraulic oil to raise its temperature and reduce viscosity, the system achieves improved control responsiveness without the energy penalty of continuous high-flow circulation. The thermal insulation maintains this temperature, reducing the ongoing energy required compared to flow-based heating methods.
Solution Approach 2:
The patent replaces the mechanical approach of using high flow rates to generate heat (through friction and compression) with a thermal approach using a heating element and insulation. This substitution reduces energy consumption because direct electrical or thermal heating is more efficient than relying on mechanical flow-induced heating, while achieving the same goal of maintaining hydraulic fluid at optimal temperature for responsive control.
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 solution enhances the control and positioning of hydraulic actuators under low temperature conditions by maintaining a continuous flow of hydraulic medium, ensuring accurate pressure control and faster temperature increase, thus improving the operational efficiency of harvester heads in forestry applications.
Implementation Method 1
A check valve may be coupled or connected with the cavity, allowing hydraulic medium to flow in an opening direction of the check valve so that hydraulic medium can flow through the cavity and the check valve
Implementation Method 2
The hydraulic medium flowing through the hydraulic circuit runs towards and from a hydraulic manifold control of the harvester head. Based on the continuous hydraulic medium flow the hydraulic medium can undergo a temperature increase
Implementation Method 3
The piston may separate the cylinder chamber and the piston rod chamber. A cavity may be provided in the piston, hydraulically coupling or connecting the cylinder chamber with the piston rod chamber
Data Source
AI summary
A harvester head having at least one hydraulic actuator with a cylinder and a piston. The hydraulic actuator having at least a cylinder chamber and a piston rod chamber, both chambers being connected to a hydraulic circuit. The piston separating the cylinder chamber and the piston rod chamber, a cavity provided in the piston, hydraulically connecting the cylinder chamber with the piston rod chamber and a check valve in connection with the cavity that allows hydraulic medium flow in an opening direction of the check valve.