Figure 30 shows a pictorial diagram of a system. There has been known a technique which guides the piston at two points (that is, two portions). The cylinder bore 560 is a stepped bore which opens in a downwardly directed surface of the housing 550 when the housing 550 is set. 2 shows the cross-sectional structure of the working liquid reservoir 70. The piston 74 is integrally provided with a large-diameter portion 74L which is snugly fitted into and guided by the cylinder bore 560, a small-diameter portion 74S which extends in the axial direction from one surface of the large-diameter portion 74L, and a projecting portion 74P which is arranged on a side opposite to the small-diameter portion 74S. An application for the embodiments shown in FIG. 0 which is housed the.
BRIEF DESCRIPTION OF THE DRAWINGS. The guiding of the piston side at two portions as described in patent document 1 is basically effective in guiding the piston smoothly. Because these diagrams require so much space, they are not usually used for complicated systems. Fluid power system diagrams require much more complex valve symbology than standard P&IDs due to the complicated valving used in fluid power systems. Due to the use of a hydraulic arrangement, according to the invention, these multi-couplers can be retained since no additional hose is required for the connection of the lowering side of the hydraulic cylinder with the reservoir. This application is a 35 USC 371 application of PCT/JP 2005/021740 filed on Nov. 26, 2005. With an understanding of the principles involved in reading fluid power diagram, any diagram can be interpreted. Pushbutton PB-1 is used to activate the valve by energizing the S-1 solenoid (note the valve is shown in the de-energized position).
The ball on seat symbols inside the valve also indicates that this is a low leakage poppet style valve rather than a traditional spool style valve. The chief point is the means for allowing air or gas trapped in the. For the opening position of the control valve 52, that is, for the activated spring support, the result is the following conditions, corresponding to the various switch positions: In the lowering position (uppermost switch position of the controller of FIG. This preview shows page 5 - 6 out of 10 pages. 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. The middle valve also has two positions but it is operated by a solenoid and includes a detented hand emergency button. WO1990005814A1||1990-05-31||SHOCK ABSORBING DEVICE FOR A MOBILE MACHINE|. The working liquid reservoir is, in general, of a piston type, wherein a piston defines a hydraulic chamber and a gas chamber in the inside of a cylinder bore. Here the control valve 52 seals in closing position in the direction of the hydraulic accumulator 48. The controller 12 is preferably controlled manually, but can also be controlled electrically, hydraulically or pneumatically. 692, 886, which comes from General Motors Corporation, Detroit, Michigan, U. S. A.
We have prepared some practical tips on how to write an effective engineering cover to…. Furthermore the lowering side of the hydraulic cylinder is connected to a hydraulic reservoir, in order, on the one hand, to avoid cavitation during the lowering and, on the other hand, to permit free movement of the piston rod during the spring support process. The movement of the piston is relatively frequent and hence, it is important to effectively guide the piston. The pump 18 that is connected with the hydraulic reservoir 20 fills the first chamber 28 of the hydraulic cylinder 26 over the first supply line 22 and over the check valve 36 of the automatic shut-off valve 32 (the relief valve 34 of the load holding valve 32 is in its closing position). This can be accomplished, for example, in the form of a switch that is switched in connection with or as a function of the neutral position at the controller. As a result the piston 29 moves in the direction of the second chamber 30 and forces the hydraulic fluid located there through the second supply line 24 into the hydraulic reservoir 20. A sensor is also conceivable here that receives a proportional signal which is converted into an electrical signal in an appropriate software electronic, that switches the control valve into the closing position. The control valve is preferably provided with a closing position and an opening position, where in the opening position the control valve closes in one or both closing directions, but in the opening direction it opens in both directions, so that a spring support function occurs in connection with the hydraulic accumulator. Do you need an answer to a question different from the above? With the basic function understood, a detailed study of the diagram can be accomplished using a step-by-step analysis of each numbered local area in the diagram. The difference between them is that the point of the arrow touches the circle in a pump and the tail of the arrow touches the circle in a motor. A separate selector valve is arranged in order to be able to open the load holding valve on the one hand, and on the other hand, to make available a spring support function even in the neutral position of the hydraulic cylinder. 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 double arrow in the left box shows that the flow may pass in both directions. It may be appreciated that along with the anti-lock control, the working liquid in the circuit flows into or flows out from the working liquid reservoir 70 in response to operations of the pump 30 and the respective solenoid valves EV, AV.
3-way directional valves. EP1157963||2001-11-28||Hydraulic system for wheeled loader|. In order to provide this assurance the automatic shut-off valve 32 should or must be arranged in a meaningful way as shown on the lifting side of the hydraulic cylinder 26 where the lifting side is the side of the hydraulic cylinder 26 in which the pressure is built up in order to lift the load. Inside each tube is a torsion rod which is fixed to the tube at the outer end only. Art advantage claimed is that in the event of damage, the whole suspension unit can be quickly removed and replaced.
A SELF-ADJUSTING TAPPET. The controller 12 is connected to a hydraulic cylinder 26 over a first and a second supply line 22, 24, where the first supply line 22 leads to a first chamber 28 of the hydraulic cylinder 26 and the second supply line 24 leads to the second chamber 30 of the hydraulic cylinder 26. Since the controller is provided with a fourth switch position, a second selector valve can be omitted that would connect the second chamber of the hydraulic cylinder with a reservoir, as is provided in conventional solutions. 1), all inlet and outlet connections to the controller 12 are closed, that is, no hydraulic fluid can flow through the supply lines 22, 24. More specifically, the invention relates to a hydraulic arrangement having a spring support mode. Each wheel is carried by a pair of swinging arms (1) each of which is secured to a cross-tube (2). A control valve 52 is arranged in the hydraulic line 46. The task underlying the invention is seen in the need to create a hydraulic arrangement of the aforementioned type with which the cost of the attainment of the "lowering function" can be reduced. Reservoirs provide a location for storage of the motive media (hydraulic fluid or compressed gas). LOCAL AREA NUMBER 5. Symbol for an open reservoir with a strainer. Further, when the piston 74 moves, the working liquid flows into or flows out from the donut-shaped hydraulic chamber 82 through the groove passages 90 formed on the outer periphery of the small-diameter portion 74S and hence, there is no possibility that a force which disturbs the movement of the piston 74 (for example, an eccentric force) is generated attributed to the inflow and outflow of the working liquid. In the spring support position, shown in FIG. The working liquid reservoir 70 is a piston-type reservoir with a capacity of approximately 3 cc.
The automatic shut-off valve 34 as well as the control valve 52 are located in a common valve building block directly at the hydraulic cylinder 26. It is obviously also conceivable that other actuation methods are applied to the control valve, for example, a manual, hydraulic or pneumatic actuation. The controller can be configured in such a way that a fourth switch position switches to a so-called floating position. This problem has been solved! By collectively arranging the communication passage to the small-diameter portion 74S of the piston 74, the working liquid reservoir can be designed while alleviating the restriction on the position and the size (diameter) of working liquid reservoir. Pneumatic reservoirs are usually simple tanks and their symbology is usually some variation of the cylinder shown in Figure 20.
DE10133616A1||2003-01-30|. On the upstroke, the oil trapped in space 7 transmits the thrust to the piston and thence to the push-rod. As soon as the control valve 52 is closed, the piston 29 can no longer perform any movement since all lines 22, 24, 46 are closed. The check valve is arranged in a by-pass line that bypasses the relief valve, where the check valve opens in the direction of the first chamber. The hydraulic arrangement 10 includes a controller 12 that can be switched, for example, a slide valve that is connected by hydraulic lines 14, 16 with a pump 18 and a hydraulic reservoir 20, where the controller 12 can be switched in four operating positions, lifting, neutral, lowering, and spring support positions. Figure 22 Symbols for Rotary Actuators. Furthermore, by-pass arrangements around the control valve by means of check valves and orifices are conceivable in order to load the hydraulic accumulator.
Valves should always be drawn in the de-activated position e. g. pushed over by the spring, not the solenoid. The housing 550 defines a stepped cylinder bore 560, including a large diameter portion constituting the working liquid reservoir 70, together with a plurality of these chamber spaces. The working liquid reservoir 70 is housed in a block-like housing of the hydraulic control unit 50. In this way the cost of the electronics can be reduced considerably, since merely one switch is required that opens or closes the control valve. The tappet has a cylindrical sliding body, the lower end of which touches the cam whilst its upper part is bored to receive a piston.
Only by activating the spring support, can the piston 29 be deflected in both directions similarly to a spring. 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. In agricultural machines, such as, for example, telescopic loaders, wheel loaders, or front loaders on tractors, it is known practice to apply a hydraulic spring support system that provides spring support for the boom or the linkage in order to attain an improved spring suspension comfort, particularly during the operation. The 'two position' means that it has two switched positions i. e. it can sit in the A or B position. When the electrical solenoids are operated the spool position moves to either the right or left-hand position, allowing the different symbol logic to be employed. 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. They are all shown at standby in their centre positions.
Other possibilities for the automatic shut-off valve are also conceivable. Here, a land portion between neighboring groove passages functions as a guide wall which guides the movement of the piston. It is generally used for instructional purposes because it explains the functions while showing how the system is arranged. Accordingly, when the working liquid flows into or flows out from the hydraulic chamber 82, the piston 74 is guided by two portions on the respective outer peripheries of the large-diameter portion 74L and the small-diameter portion 74S and hence, the piston 74 is moved smoothly without becoming eccentric. 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. 10 1 The LOA position refers to a fetus whose occiput O is facing toward the.
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