农民和其他工人通常一次花几个小时在拖拉机开车，因此身体舒适是优先的。由于拖拉机的前轴受到高度可变载荷的约束，因此在悬架系统中使用的水源性系统被调整为固定的弹簧速率特征。现在，Freudenberg-Nok密封技术（Freudenberg-nok）正在测试一个新系统，该系统可以使用该系统来单独配置悬架。新系统在按下按钮时承诺更大的舒适性和灵活性。
Modern tractors must perform on roads as well as in fields, since the forces that act on the front axle are low when the tractor pulls attached equipment over a field and increase significantly when traveling on a road with a trailer. If the tractor is transporting a bale of hay using a front loader, the front axle is subjected to a very high load. In such cases, the forces can reach up to 10 tons.
This places high demands on the front axle’s suspension, which is largely executed with hydropneumatic systems in which hydraulic accumulators – and not conventional mechanical springs and dampers – are employed. In the process, the gas-side pressure in the hydraulic accumulator plays a central role in determining the suspension system’s rigidity.
弗洛伊登伯格诺is continually advancing the development of suspension systems that compensate for the tractor’s various operating conditions and offer the driver the best possible comfort. The company’s engineers are testing a new system in which the driver can configure the desired rigidity using an adjustment in the cockpit.
The hydropneumatic suspension is based on the principle of pressure and counterpressure. In this approach, the pressure produced by the excitation of the vehicle is balanced with a hydraulic counterpressure. The front wheels of the tractor are connected to a spring-loaded ball via the pistons of a hydraulic cylinder which serves as a hydraulic accumulator. This spring-loaded ball is filled with hydrogen under high pressure; a membrane separates the gas from the hydraulic fluid.
弗洛伊登伯格诺’s new system has the capacity to adaptively control the hydraulic counterpressure in line with the tractor’s load. In the process, a valve block communicates with the vehicle electronic system and adjusts the counterpressure with the help of pressure control valves. The counterpressure builds up by means of the hydraulic fluid in the annular space between the cylinder wall and the piston.
Specialists from Freudenberg-NOK work closely with tractor manufacturers on the application of suspension systems to various vehicle concepts and provide the best possible suspension for each area of application. This includes the design and simulation of the system, prototype construction, technical trials and testing, and the application of prototypes to customer systems. To achieve the best possible driving comfort, the services of Freudenberg-NOK engineers are rounded out with test drives and development work up to production.
弗洛伊登伯格诺
Filed Under:Hydraulic equipment + components
