In the spring support position, shown in FIG. 2 is a cross-sectional view showing one embodiment of the working liquid reservoir of the present invention, wherein the drawing shows states in which the piston assumes different positions at left and right sides of the drawing. Figure 25 Valve Symbol Development. The trailer carries projecting piece (1) whic enters the open end of forked member (2) on th tractor. Alternatively the spring support could be activated automatically by the generation of an activation signal as soon as the controller 12 is switched into the fourth switch position. This control is performed by pilot pressure lines that extend from the relief valve to the first and the second supply line. Fluid power systems are divided into five basic parts: In the broad area of fluid power, two categories of pump symbols are used, depending on the motive media being used (i. e., hydraulic or pneumatic). The hydraulic control unit 50 includes a pump 30 which is driven by an electric motor M. The pump 30 is constituted of coupled plunger pumps, and a brake liquid pressure is applied to the respective wheel cylinders 201 to 204 through the normally-opened respective solenoid valves EV, while a brake liquid pressure of the respective wheel cylinders 201 to 204 is released to the working liquid reservoir 70 through the normally-closed respective solenoid valves AV. The right side of Figure 28 shows the fluid power diagram that represents the drawing in Figure 27. As can be understood from FIG. However, this configuration could be very dangerous if stopping the load from falling is the main concern. The control valve 52 is in a closed position. Due to the omission of the second control valve the number of possible sources of failure is also reduced, since one less component is applied. Under the circumstance in which the miniaturization of the working liquid reservoir per se is in progress, to ensure the more rapid responsiveness in a brake control, as one of external factors which influences the motion of the piston, it is required to ensure the smooth inflow of the working liquid into the hydraulic chamber and the smooth outflow of the working liquid from the hydraulic chamber.
Linear actuators have some form of piston device. This, gives not only compensation, but also the spring effect due to the torsion rods. Thomas Hobbes 1588 1679 elaborated on the concept of sovereignty shifting the. 2, a state in which the working liquid stored in the working liquid reservoir 70 is zero or almost zero is shown on a left side, while a state in which the working liquid reservoir 70 is filled with the stored working liquid is shown on a right side. The force is applied perpendicularly to the brake pedal. Although the invention has been described in terms of only two embodiments, anyone skilled in the art will perceive many varied alternatives, modifications and variations in the light of the above description as well as the drawing, all of which fall under the present invention. If during a lowering or lifting process a bump is transmitted to the piston 29, it can deflect in a spring-like motion without any danger of cavitation, since the lowering side is unloaded in the direction of the hydraulic reservoir 20. The basic elements of the brake control device are constituted of a tandem-type master cylinder 10 which constitutes a liquid pressure generating source of a brake, four wheel cylinders 201, 202, 203, 204 which are provided corresponding to four wheels of a vehicle, and a hydraulic control unit 50 which is positioned between the wheel cylinders 201 to 204 and the master cylinder 10. Valves should always be drawn in the de-activated position e. g. pushed over by the spring, not the solenoid. The linings are pressed against both sides of a disc attached to the rotating wheel. An example might be that as the cylinder extends, it contacts the roller, which switches the valve and this stops the cylinder stops moving. The '4 way' means it has 4 pipe connections, generally Pressure, Return, Port A and Port B. When the spring action is activated and in spring action position there is the assurance that during an excitation, for example, by the running gear of the telescopic loader 82, bump-like accelerations due to the free swinging of the boom are damped, so that the operating comfort can be increased, particularly when the operating tool 98 takes up loads and moves them.
A spring support system is proposed for the boom of a telescopic loader that is provided with a load holding valve or an automatic shut-off valve in order to secure the boom against falling off. Thereby, only a single control valve is used, preferably with which only the lifting side of the hydraulic cylinder is connected to the hydraulic accumulator. With electro-hydraulically controlled controllers such a switch is usually not required, since this task can be taken over by the software of an electronic control unit. The pedal rotates about the axis shown in the drawing and causes a force to be applied perpendicularly to the input piston (radius = 9. C) A communication passage is formed between an inner peripheral wall of the second cylinder bore and an outer periphery of the small-diameter portion of the piston, and the working liquid reciprocates between the donut-shaped hydraulic chamber and an external hydraulic circuit through the communication passage. When pressure is applied to the bottom chamber, the top chamber is aligned so that it drains back to the reservoir. In that way, for example, the hydraulic arrangement can also be applied to other vehicles, for example, to wheel loaders or front loaders or even to excavators or cranes, that are provided with hydraulically actuated components, that must be raised or lowered and in which spring support appears useful. Several kinds of diagrams can be used to show how systems work. A hydraulic arrangement for such a spring support system is disclosed in EP 1 157 963 A2. The patent gives full details of this interconnecting box, both diagrammatically and constructionally. The end of the spring is received in a rectangular hole in a metal bush (3) which is bonded to the rubber bush, the latter being also externally bonded to a thin sleeve (4).
The automatic shut-off valve 32 contains a pressure and spring controlled relief valve 34 as well as a check valve 36 that opens to the hydraulic cylinder side that is arranged over a bypass line 38 parallel to the relief valve 34. More specifically, the invention relates to a hydraulic arrangement having a spring support mode. 1) the first supply line 22 is closed and the second supply line 24 is connected to the hydraulic reservoir 20.
This may also be a manual, electric, hydraulic or pneumatic actuating arrangement 58. 2 shows a schematic view of a telescopic loader with a hydraulic arrangement of FIG. The working liquid reservoir 70 is housed in a block-like housing of the hydraulic control unit 50. The piston 29 remains stationary. A hydraulic arrangement 10 shown in FIG. In the embodiment shown in FIG. As long as the control valve 52 is in its closed position, that is as long as the hydraulic accumulator 48 is separated from the hydraulic cylinder 26, and thereby the spring support is also deactivated, then the piston 29 in its spring support position can move only in the direction of the second chamber 30. The controller can be configured so that it can be operated manually or even electrically, where obviously other methods are also conceivable, for example, pneumatic or hydraulic methods that shall, however, not be explained in any further detail. Figure 29 shows the kind of diagram that is likely to be encountered in the engineering field. The resulting pressure is transmitted by the brake fluid.
In addition to performing the duties of a shackle, the improved anchorage also permits the spring to twist to a considerable extent. 50 Ã 10-3 m) in the master cylinder. The foregoing relates to a preferred exemplary embodiment of the invention, it being understood that other variants and embodiments thereof are possible within the spirit and scope of the invention, the latter being defined by the appended claims. The controller 12 is preferably controlled manually, but can also be controlled electrically, hydraulically or pneumatically. DESCRIPTION OF THE PREFERRED EMBODIMENTS. 4 way 3 position directional valves. In comparison to conventional spring support systems, the result here is a more cost effective hydraulic arrangement, since the necessary second control valve is omitted along with its hose connection on the side of the second chamber of the hydraulic cylinder and instead a commercially available slide valve with a floating position function can be used. Hydraulic chamber to escape readily. Simultaneously the piston 29 can perform the spring motions since a connection has been established to the hydraulic accumulator 48 on the lifting side and from the hydraulic reservoir 20 on the lowering side. Hydraulic systems are often used in press work or other applications where the work piece must be held in place. In the individual positions the supply lines of the controller are connected to the hydraulic fluid feeder or to the reservoir in various ways or closed, corresponding to the positioning function (lifting, lowering, neutral position (holding) and spring support). Upload your study docs or become a.
This provides the assurance that the control unit 66 closes the control valve 52 when the switch is performed over the neutral position, but not in every switch process of the controller 12. Description of the Prior Art. An actuator in a fluid power system is any device that converts the hydraulic or pneumatic pressure into mechanical work. It also acts as an unloader valve to relieve pressure when the cylinder is not in operation. To convey this information, symbology conventions have been developed. Figure 24 Valve Operation. The control valve is preferably actuated electrically. In order to avoid this condition, the switch or the sensor 64 transmits a signal that is received by the control unit 66. This condition makes it necessary for the "lowering" function of the hydraulic cylinder to be detected or monitored at an appropriate location and must be considered in the switching logic of the spring support arrangement for the closing of the control valve, which has been found to be particularly costly and problematical in the case of purely mechanically actuated controllers. In the inside of the cylinder bore 560 which is hermetically sealed by the lid member 72, besides a resin-made piston 74, a conical compression spring 76 which pushes the piston 74 in the depth direction of the cylinder bore 560 is arranged. Pneumatic reservoirs are usually simple tanks and their symbology is usually some variation of the cylinder shown in Figure 20.
A pressure connection from the relief valve 34 to the section of the first supply line 22 on the side of the hydraulic cylinder is established over a first pressure line 40. Control or switching signals are generated over a control arrangement, not shown, with which the controller 12 as well as the control valve 52 are controlled or switched (see FIG. The land portions 92 between the groove passages 90 slide on an inner wall of the second cylinder bore 562 thus guiding the movement of the piston 74.
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