Hydraulic valve device, hydraulic system with hydraulic valve device and machine
A technology of hydraulic valves and machines, which is applied in the direction of valve devices, fluid pressure actuating devices, valve operation/release devices, etc., and can solve the problems of reducing fatigue life, wear, fatigue failure, etc.
Active Publication Date: 2015-07-15
CATERPILLAR INC
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- Application Information
AI Technical Summary
Problems solved by technology
During operation of repeatedly opening and closing this flow path, the spool repeatedly contacts the poppet causing wear and reduced fatigue life
For example, in the case of a machine with a rated fatigue life of 10,000 working hours, this contact type anti-settling valve will experience fatigue failure after working for about 200 hours
Method used
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Embodiment Construction
[0014] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.
[0015] figure 1 A part of a hydraulic system comprising a hydraulic valve arrangement 1 according to an embodiment of the invention is schematically shown. Such as figure 1 As shown, the hydraulic valve device 1 is arranged in a housing, in which the plunger 2 is also arranged. The plunger 2 is able to open and close the hydraulic connection between the passage 3 communicating with the working cylinder and the passage 4 communicating with the pump. In the chamber 5 between the hydraulic valve device 1 and the plunger 2 there is provided a spring which urges the plunger 2 towards a position blocking the communication between the passage 3 and the passage 4 . An orifice 6 is formed in the plunger 2 to communicate the passage 3 with the chamber 5 . The hydraulic valve arrangement 1 is switchable between a closed state prev...
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The invention relates to a hydraulic valve device, a hydraulic system with the hydraulic valve device and a machine. The hydraulic valve device (1) comprises a valve shell (10), a poppet valve element (30) and a sliding column (40), wherein the poppet valve element (30) and the sliding column (40) are arranged in the valve shell (10); and a first hydraulic cavity (11) communicated with a working cylinder, a second hydraulic cavity (13) communicated with a hydraulic fluid container and a third hydraulic cavity (15) communicated with a pilot control opening (7) are limited. The poppet valve element (30) and the sliding column (40) can move in the valve shell (10) in the axial direction so as to be switched between a closing state preventing hydraulic fluid in the working cylinder from flowing to the hydraulic fluid container and an opening state allowing the hydraulic fluid in the working cylinder to flow to the hydraulic fluid container. In the process of switching the closing state to the opening state or switching the opening state to the closing state, the sliding column (40) is not in contact with the poppet valve element (30) all the time. Therefore, the durability of the hydraulic valve device can be improved by reducing abrasion caused by contact of a valve element.
Description
technical field [0001] This invention relates to hydraulic valve arrangements and in particular to anti-draft valves for use in hydraulic systems of machines such as loaders. The invention also relates to hydraulic systems and machines comprising the hydraulic valve arrangement. Background technique [0002] Hydraulic systems are usually used in machines such as loaders, and the operator controls the pilot control valve in the hydraulic system by manipulating the rocker to switch on or off the corresponding oil circuit, so that the working device performs the desired action. For example, the working device of a loader mainly includes booms and buckets, and the hydraulic system supplies hydraulic fluid to hydraulic cylinders (lift cylinders or bucket cylinders) associated with the booms and buckets, thereby achieving different actions, including Shovel digging, boom lifting or lowering, bucket tipping and discharging, etc. During the operation of the loader, it is often des...
Claims
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IPC IPC(8): F15B13/02
CPCF15B13/02F16K3/262F16K31/12
Inventor 黄长发吴海峰周畅桑成林
Owner CATERPILLAR INC