DE1149583B - Control unit for hydraulic system, in particular with a group of closely spaced, interconnected individual valves - Google Patents

Description

GERMAN

PATENT OFFICE

H 46478 Xn / 47g

REGISTRATION DATE: JULY 27, 1962

NOTICE
THE REGISTRATION
ANDOUTPUTE
EDITORIAL: MAY 30, 1963

Control units for pressure medium controls, especially those with a group of each other closely adjacent, interconnected individual valves, generally consist of an upper connection piece, which the pressure medium is supplied by a pump, a lower connection piece, in which the outflowing pressure medium is collected before the return to a collecting container, and further from a large number of similar individual valves, which are arranged one above the other between upper and lower connecting pieces are clamped.

Each individual valve contains one or two working channels that open out on one side of the valve and selectively connected to one of the working channels with the pressure medium inlet or the pressure medium outlet can be. For this purpose, the individual valves are with aligned channels which extend from top to bottom through the group of stacked individual valves. At least one of these channels is provided for the flow of pressure medium and stands with it the inlet chamber of the inlet port in connection. Another forms the return channel, which is connected to a Chamber of the outlet port is in communication.

Although the control valves composed of individual valves have known advantages, it adheres So far they have also presented a very uncomfortable and highly objectionable disadvantage. With all valves so far, external leaks have occurred at the transition points where individual valves interact and are connected to the connecting pieces. The pressure medium under high pressure tends in addition, on the mutually aligned abutment surfaces of the feed and / or central channel sections in the Seals infiltrate between the individual sections and escape to the outside there. These Leakages were unavoidable in spite of the aligned mating surfaces of the neighboring components and despite the arrangement of O-rings, which are taut between the individual valves in all transmission channels were used and the ends of the respective channels as a continuation to the adjacent Surrounded single valve.

The deficiency not only leads to a loss of pressure medium, but also to the fact that oil is in the with the Control valve infiltrates the devices to be controlled and contaminates them. On the oily outer surfaces of the Valves and the devices carrying these valves then also collect considerable dirt and debris Amounts of dust. This disadvantage is particularly present if the controlled devices are already in the Control unit for hydraulic system,

especially with a group of closely spaced, interconnected

Single valves

Applicant:

Hydraulic Unit Specialties Company, Waukesha, Wis. (V. St. A.)

Representative: Dipl.-Ing. H. W. Schöning, patent attorney, Hamburg 1, Mönckebergstr. 31

Claimed priority: V. St. v. America, March 30, 1962 (No. 183 904)

Francis Henry Tennis, Milwaukee, Wis. (V. St. A.), has been named as the inventor

Dirt is moved, such as in bulldozers, bulldozers, front and rear loaders and the like.

With these disadvantages in mind, the object of the present invention is to provide a control unit of the type described above, which is designed so that at the transition points no pressure medium can escape to the outside between the individual valves. This is achieved by that the pressurized fluid channels meet in a zone of the mating surfaces, by a channel with a low pressure, preferably a pressure medium return channel, connected recess is surrounded.

In the following description, a preferred embodiment is shown with reference to the drawings the invention explained for example. In the drawings shows

1 shows a side view of a control valve consisting of several individual valves according to the present invention Invention,

FIG. 2 shows a cross section according to the section line 2-2 of FIG. 1,

3 shows a longitudinal section along the section line 3-3 of FIGS. 1 and

4 shows a perspective view of two adjacent individual valves which are separated from one another

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of the control valve to represent the mating surfaces that belong together at the transition points prevent the pressure medium from seeping out to the outside.

As the drawings show, the hydraulic system consists of several individual valves Control valve of the invention from the usual upper and lower housing parts 5 and 6 as inlet and Outlet nozzle and also a central part of

In this case, however, the upper end of the return duct extends into the upper connecting piece 5 extended into it with a bore 25, from which the pressure medium escape via a pressure relief valve 26 5 can when the pressure in the inlet chamber 10 becomes too high.

In the housing of the control valve there is also a substantially centrally arranged throughflow or Central channel 28 is provided between the feed and

any number of control sections or io return channel runs and in the usual way zig-zig-individual valves 7 is formed, which can be configured in a stack-like manner on top of one another. The central channel The pelt between the upper and lower connection 28 in each individual valve consists of two adjacent connecting pieces are clamped. Several bolts 8 hard inflow and outflow arms that also introduce from top to bottom through the top and other through the valve holes lower housing parts and the intermediate 15 stand and on the top and bottom of each Individual valves through to these tightly together- individual valve exactly opposite the connection opening. end of the channels of the adjacent individual valves.

As an example, it is assumed here that the central arm of the central channel in the upper part of the control valve of two in every relationship single valve 7 is connected to the outlet opening 11 of the identical individual valves 7 is formed, which are in the 20 inlet connection in connection, and the outlet side Center position ensure free flow and the arm of the center channel is in the lower individual valve parallel operation of two different hydraulic via the opening 13 with the chamber 12 of the outlet recess Allow circles (not shown). Connection.

In the case of the control valve described here, the valve shown as an example is equipped with a free

upper connection piece 5 at the top with a 25 flow in the middle position can be the inlet inlet or pump opening 9 is provided and contains pressure medium supplied through the port free through all in its interior an inlet chamber 10. In the control sections or individual valves 7 to the outlet center An outlet opening 11 is provided on the underside, as long as the valve spindles 16 are located seen. Similarly, the outlet contains the individual valves in those shown in FIGS clip 6 in its interior are an outlet chamber 12 30 neutral positions.

and has an inlet opening 13 at the top. From FIG. 2 it can be seen that the feed channel

which is vertically aligned with the opening 11 of the upper connecting piece 19 with essentially U-shaped feed channels 30. On the underside of the outlet connection of the individual valves 7 there is an outlet or collecting container opening 14 in front of it via check valves 31 in Verist, which can be seen in any working position. Although 35 of the control valve spindles 16 are not opened for the present invention, which is of importance, the individual valves 7 are designed as a double flow through the feed channel arm to the acting valves. To enable the desired working channel for each individual valve. The holds a valve bore 15 with a valve spindle feed channel 30 has two arms 32 which are connected between the 16, which extends in the longitudinal direction in the bore of a central channel 28 and the working channels 17 with the neutral position shown in FIG To be connected
different working positions pushed back and forth. Each individual valve 7 is also equipped with an alternating

can be. In each of these two working positions sentlichen U-shaped return channel 33 provided, one of the two working channels 17 is connected to the chamber with the return channel 20, mer 10 of the inlet port and the other with the opposite arms 34 of the channel Chamber 12 of the outlet connection 6 in connection. The 45 33 cut the bore 15 outside the working working channels 17 lead from the bore 15 to channels 17. As a result, when the valve spindle

16 is in the position shown in FIG. 2, which is supplied to the inlet connection 5 by a pump Pressure medium can flow freely through the valve to the outlet port, the valve spindle making the connection between the individual working channels and the neighboring supply and return channels locks. When the valve spindle is moved from the neutral position to any working position

19 or 20, which is provided with a corresponding 55, in which one of the larger central spindle lateral spacing blocks the central channel vertically through the stack of sections, a single valve 7 is created. The inlet end of the connection between one arm of the feed channel 32 feed channel 19 is a bore 21 on the lower and the adjacent working channel and furthermore one side of the inlet connection, which opens onto bores 22 in connection between the other working channel and the individual valves or control sections 7 the adjacent arm of the return duct,
is directed and a connection to the inlet chamber Although it is in the illustrated individual valves

manufactures. The lower end of the feed channel 19 is a parallel circuit valve, which is only for the purpose of explanation the lower connecting piece 6 blocked. Chosen in tion of the invention can be more self-similar The outlet end of the return line is, of course, also single valves for series parallel ducts 20 a hole 23 can be provided on the top of the circuit 65, in which case the outlet connector 6, which leads to chamber 12 and into a U-shaped feed channel 32 of each individual valve tical direction to the outlet bores 24 of his pressure medium from the inflow end of the central single valve or control sections 7 is aligned. channel receives this single valve and no more

outside and end on one side of the individual valve at connection openings 18, which are connected to one of the Connect the two connections of a hydraulic cylinder or the like.

Each working channel is through the valve slide 16 with either the inlet or the outlet port connectable. For this purpose, the housing of each individual valve is provided with supply and return channels

Claims (5)

5 6 Via a separate feed channel 19. In this lower ends of the channels 24 and 25 open from Trap is the inflow end of the central channel each down directly into the shallow recesses, Single valve provided with a side branch, while the upper ends of channels 23 and 24 in which leads from the central channel to the feed channel 31; that emerge from the mating surfaces 36 at points that the The non-return valve will then be located opposite in this branch at 5 flat recesses. So stand orderly. two adjacent sections of the return channel with The abutting surfaces of all of the individual elements in connection with each other via the flat recess 42 valves of the control valve and the upper and lower manure. Connection pieces are completely flat works, so that exact mating surfaces arise, the with- io entire pressure medium, which is under high pressure can be brought into engagement with each other when from the central channel 28 or the feed channel 19 in the individual valves are stacked on top of one another and tied through the dividing lines in the area of the islands 43, has seeped into the shallow recess 42 and from According to the present invention, there is via the return channel 20 to the storage container Top of each individual valve of the control valve 15 of the hydraulic system. It should still go up on it a base 37 a flat machined surface 36 are shown that the only O-ring 40 that the (Fig. 4) provided. A similar flat machined shallow recess surrounds, does not have the task of Mating surface 38 is on a base 39 on the back side of the pressure medium, which is under high pressure of each individual valve provided. If available, because the flat recess is below desires, the pedestals can also be omitted because they are using atmospheric or low pressure so that the flat mating surfaces 36 and the return channel 20 is connected. Thus, the 38 over the entire surface of the individual valves at pressure of the fluid in the flat Ausden Extend separation points. intake never exceed the value in the All collecting channels for the inflow and outflow of the associated storage tank of the system are available. Pressure medium open essentially in the middle is. leren area of these flat mating surfaces. The only low-pressure O-ring can thus be used effectively Individual valves composite control valves of the tiv external leaks at the transition points The type of valve affected here was previously able to prevent this from happening under the adjacent housing sections. Here High pressure fluid from the center is also important to keep the O-ring inside channel 28 un & 'or from the feed channel 19 to 30 of the pitch circle of the holes 45, in which the escape outside and a leakage flow to the tight bolt 8 for clamping the housing parts together engage adjacent mating surfaces of the individual valves. cause, so that the problem discussed in the introduction is clear to the person skilled in the art that the Q-rings also in the external leakage arose, for which it was previously possible to provide the grooves of the base 37- there was no solution. 35 nen. The flat recesses can be just as easily In the valve according to the invention, however, conditions are also provided in the surfaces 36 of the individual valves or external leakages at the transition points between the two mating surfaces 36 and 38,
the individual valves of the control valve effectively although the invention prevents hydraulic control. This prevention of leaks is described with valves with several individual valves, a single low-pressure O-ring 40 or 40, it is obvious that the inventive equivalent seal between two adjacent seals advantageously also enables separation points between housing parts. The O-ring 40 will be used in any two bodies with inner conduit connectors spaced from the outer circumference of the more manure, as long as one of these or less circular sockets 39 is in a one-conduit with a drain or stock-cut annular channel 41 at the bottom - 45 container can be connected, to which the leakage flow is arranged on the side of each housing section. Which can be directed. An example of such an arrangement depth of the channel is understandably, preferably where the connection between the lower valve is somewhat smaller than the thickness of the O-ring. The gutter til 7 and the outlet port 6, where the feed channel 41 delimits a shallow recess 42 in the 19 dead ends at the top 36 of the outlet port surface of the base 39, which is also a 5 ° and the high pressure pressure medium, a flat Surrounding surface 38 provided zone that exits at the lower end of the feed line, which can be referred to as island 43 and at which the recess 42 can enter, from there counter surface 36 of the underlying individual valve comes under low pressure via the return channel 23 to the plant . to be led away. According to the present invention, the 55th Central and / or feed channel 28 or 19 in the PATENT CLAIMS:
flat mating surfaces 36 of the housing sections in the area of the island 43 relatively close to one another, as can be seen in the first control unit for hydraulic system with FIG. Specifically, the lower of a plurality of mating surfaces ends of the feed channels 21 and 22 within the 60 connected housing parts, the pressure medium islands 43 of which are adjacent to the outflow ends of the central channels in the area of the mating surfaces of each individual valve. The upper butt, in particular control valve with several ends of the same channels, occur at the mating surfaces of the individual valves stacked on top of one another, thereby 36 on the upper sides of the individual valves to the outside. marked that the under high pressure The channel sections 23, 24 and 25, of which the 65 standing pressure medium channels (19, 28) in one Return channel 20 is formed, are with the zone (43) of the mating surfaces (36,38) against each other- shallow recesses 42 on the undersides of the butt, from one with a lower one below individual housing sections in connection. The pressurized channel, preferably one Druckmittekrücklaufkanal (20), connected recess (42) is surrounded. 2. Control unit according to claim 1, characterized in that the flat, under low pressure recess (42) is surrounded by a sealing ring (40) embedded between the mating surfaces (36, 38) of the adjacent housing parts (5, 6, 7). 3. Control unit according to claim 1 and 2, characterized in that the recess (42) is formed only in one of the mating surfaces (38). 4. Control unit according to claim 1 to 3, characterized in that in one of the mating surfaces (38) a channel (41) for receiving the sealing ring (40) is formed. 5. Control unit according to claim 1 to 4, characterized in that the housing parts (5, 6, 7) clamping the bolts (8) outside the flat recess (42) or the sealing ring (40) surrounding the recess (42) are arranged . Considered publications:
German Patent Nos. 36 220, 65 439;
U.S. Patent No. 2186,657. 1 sheet of drawings © 309 598/154 5.63