JPH06100291B2 - Hydraulic device for selection and transmission of pressure signal in block switching valve. - Google Patents

Description

Description: INDUSTRIAL APPLICABILITY The present invention discloses that the housing of a block switching valve has a blind hole-like recess in the flange face, which recess is covered by the flange face of the adjacent control block element. The two control passages in the housing lead to the bottom of the recess and the third control passage leads to the recess from the adjacent control block element, the lower of the two different magnitude pressure signals being introduced. In order to block the higher signal and to transmit the higher signal, the recess contains a replaceable insert for the alternative function, which insert allows the central connection of the shuttle valve to extract the higher signal. But,
Selectively connectable to a control passage in a block switching valve or a control passage in an adjacent control block element,
The present invention relates to a hydraulic device for selecting and transmitting a pressure signal in a block switching valve.

[Conventional technology]

Such a device is disclosed in German Patent Application No. 3309
No. 998, it is possible to incorporate different inserts into the blind hole recesses in the flange surface,
Left and right configurations are available in the same structural housing of the block switching valve. Each of these inserts consists of a multi-part structure having a shuttle valve therein, the spherical valve member of which is movable parallel to the flange face. These multi-part structures have the disadvantage that they are relatively expensive and require forming tools for non-machined parts for their manufacture.

[Problems to be solved by the invention]

The object of the present invention is to provide a hydraulic device which does not have these drawbacks.

[Means for solving problems]

In order to solve this problem, according to the present invention, a control passage for introducing the pressure signal of the block switching valve leads to the center of the bottom of the recess, and the opening to the bottom is configured as a conical valve seat, and the insert body is formed. Is guided axially in the recess and has the function of the valve member of the shuttle valve movable on the longitudinal axis of the recess.

〔The invention's effect〕

According to the present invention, it is possible to realize a left configuration and a right configuration with the same housing, while making a simpler and cheaper structure than the conventional one. That is, according to the present invention, the control passage for introducing the pressure signal of the block switching valve from the left as viewed from the operating side leads to the center of the bottom of the recess, and the opening to the bottom is formed as a conical valve seat. In the left configuration, where the maximum pressure signal must be directed to the left of the block switching valve, the axially movable insert itself in the recess is configured as the valve member of the shuttle valve, and therefore rotates about the central axis of the control passage. It can be manufactured inexpensively as one symmetrical turning part. In the case of the right configuration, the insert itself is fixedly provided in the recess, but the movable valve member therein indirectly serves as the valve member of the shuttle valve. In this case, unlike the prior art, the movable valve member inside the insert is movable on the axis of the control passage leading to the center of the bottom, so that the axial hole for guiding the valve member can be easily machined. Further, in both the left configuration and the right configuration, since the insert body performs the axial sealing, the sealing structure is simplified.

〔Example〕

An embodiment of the invention is shown in the drawings and will be described below.

FIG. 1 shows a simplified partial cross-section of the housing 10 of the first block switching valve 11, the first flange surface 12 of which has a second flange surface 14 of a second block switching valve 13 as a control block element. Is installed.

The housing 10 has a blind hole-shaped recess 15 from the first flange surface 12.
Is provided, the bottom 16 of which is at a distance from the spool hole 17. The bottom 16 has a first control passage 18 leading to a spool hole 17
From which the pressure signal Y1 is transmitted. The first control passage 18 extends coaxially to a cylindrically shaped recess 15 whose opening to the bottom 16 is designed as a conical valve seat 19.

A second control passage 21 extends in the housing 10 parallel to the first control passage 18 and connects a second flange surface 22 on the housing 10 to the bottom 16 of the recess 15. This second control passage 21 extends away from the spool hole 17 and opens into the bottom 16 between the conical valve seat 19 and the outer diameter of the recess 15. A third control passage is provided in the housing 23 of the second block switching valve 13 which is flange-coupled coaxially with the second control passage 21.
24 is extended. The third control passage 24 is the second flange surface
A pressure signal Y2 from a device (not shown) for selecting and transmitting the pressure signal at the second block switching valve 13 is transmitted to 14 and transmitted. The recess 15 in the housing 10 is the first flange surface
It is widened toward the 12 by a turning groove 25, and an O-ring 26 is provided in this turning groove for sealing against the outside, and at the same time, it has a function of preventing loss.

The recess 15 in the housing 10 accommodates an insert 27, which in the left configuration shown in FIG. 1 is constructed as an integrated turning part. In the region of the shoulder 28, the insert 27 is guided axially in the recess 15 and the resulting radial gap 29 is sized for easy transmission of the pressure signal. The insert 27 has on its inner end face 31 a closure member 32, the spherical sealing surface 33 of which cooperates with the housing fixed valve seat 19. A circularly extending sealing strip 35 is formed on the outer end face 34 of the insert 27 and acts like a seat valve with the second flange face 14 of the adjacent block switching valve 13. The diameter of the sealing strip 35 is chosen to be as large as possible and is approximately equal to the outer diameter of the insert 27, so that the opening of the third control passage 24 to the second flange face 14 is surrounded by the sealing strip 35. Within the plane.

The insert 27 is a weak spring supported on the second flange surface 14.
By 36, the sealing surface 33 is preloaded in the direction of the preferential position in contact with the conical valve seat 19 and the sealing strip 35 is separated from the second flange surface 14.

The recess 15 formed corresponding to the insert 27 is part of the first device 37 for selecting and transmitting the pressure signal in the block switching valve 11. The integral insert 27 forms the valve member of the shuttle valve, the first control passage 18 and the third control passage 24 form a side connection port, and the second control passage 21 forms the central connection port of the shuttle valve. The higher of the two pressure signals Y1, Y2 that have been formed and arrived is transmitted as the pressure signal Y via this central connection. In that case, the insert 27 defines an annular space 38 in the recess 15, this annular space 38 is connected to the second control passage 21 and its side connection ports 18, 24 can be alternately opened and closed. .

The operation of the first device 37 in the first block switching valve 11 is as follows.

In a load pressure compensated control system with multiple block switching valves, the maximum load pressure signal must be selected and transmitted to the pressure medium supply so that the motor under maximum load can also be controlled. For this purpose, the spool hole is passed through the first control passage 18 of the first block switching valve 11.
A pressure signal Y1 is taken from 17 and is equal to the maximum load of the connected motor. This pressure signal Y1 is input to the first device 37. A pressure signal Y2, which is equal to the maximum load of the motor controlled by the second block switching valve 13, for example, is taken out in the likewise adjacent second block switching valve 13. This pressure signal Y2 is also input to the device 37.

The incoming pressure signal Y2 is greater than the pressure signal Y1 and the insert 27
Is in the priority position shown in FIG. 1, the higher pressure signal Y2
Is also formed in the annular space 38 via the open sealing strip 35 and the radial gap 29 and via the second control passage 21 the pressure signal Y.
Is transmitted to the second flange surface 22. The annular space 38 is in this case closed off from the first control passage 18 by the closing member 32. Apart from the weak force of the spring 36, the force generated by the pressure difference between the two pressure signals Y2 and Y1 together with the pressure receiving surface defined by the effective seat diameter of the closure member 32 causes the insert 27 to move into the conical valve seat 19.
Is pressed against.

When the pressure signal Y1 is larger than the pressure signal Y2, the force of the spring 36 is overcome and the insert 27 is pushed to the right, and the sealing strip 35 is pushed to the second flange surface 14 of the adjacent block switching valve 13. Supported. This sealing strip 35 now defines the effective pressure receiving surface.
In this case, the connection from the third control passage 24 to the second control passage 21 is cut off. At the same time, the closure member 32 moves away from its valve seat 19, so that the higher pressure signal Y1 now passes through the sealing surface 33 to the annular space 38, from which it passes via the second control passage 21 to the second control passage 21.
Can be transmitted to the flange surface 22 of the.

Therefore, FIG. 1 shows the left configuration of the first controller 37,
The higher pressure signal of the two incoming pressure signals Y1 and Y2 is selected and transmitted, while the lower pressure signal is blocked. If the pressure medium inlet is provided to the left of the individual block valves 11, 13 when viewed from the operating side, and therefore the maximum control pressure signal has to be returned there, the control block is referred to as a left configuration.

FIG. 2 shows, in simplified form, a second device 40 for the selection and transmission of pressure signals in the block switching valve in the right configuration. In this second device 40, the housings 10 and 23 of both block switching valves 11 and 13 are the same as in FIG.
The recess 15 in the housing 10 accommodates a different second insert 41.

The second insert 41 differs from the first insert 27 according to FIG. 1 in particular in the following points. That is, the second insert does not assume the function of the valve member itself, but has additional structural elements therein for the shuttle valve function. The second insert 41 is now fixedly provided in the housing 10 and the shoulder 42
Is centered in the recess 15 and the sealing ring 43 provides a radial seal. The second insert 41 is sealingly and fixedly pressed against the conical valve seat 19 by means of a sealing cone 44 on the end face, whereby the annular space 38 is closed.

The sealing cone 44 surrounds a stepped blind hole 45 provided from the inner end surface 31, the step of which forms a valve seat 46. Blind hole
A spherical valve member 48 is guided to the outer portion 47 of 45 and functions as a shuttle valve. Outer portion 47 is the first control passage
Since the diameter is chosen to be larger than 18, the valve seat 19 fixed to the housing can likewise cooperate with the spherical valve member 48. A lateral hole 51 extends from the inner part 49 of the blind hole 45 into the annular space 38 leading to the second control passage 21. More blind holes 45
From the outer part 47 of the second insertion body 41 to the inclined hole 52.
34, where it is connected via a flat recess 53 to a third control passage 24 in the second block switching valve 13. A weak spring 54 provided in the blind hole 45 places the spherical valve member 48 in the preferred position as shown.

The operation of the second device 40 according to FIG.
The device 37 is different from the device 37 in FIG.

The spherical valve member 48 now takes over the shuttle valve function of the second insert 41 fixedly provided in the housing. Pressure signal
Y1 is generated in the first control passage 18 as before and the incoming second pressure signal Y2 is introduced into the second device 40 via the second control passage 21. The second pressure signal Y2 is the first pressure signal
When greater than Y1, the pressure is also formed in the third control passage 24 of the second block switching valve 13 via the annular space 38, the lateral hole 51, the inner valve seat 46, the inclined hole 52 and the recess 53, and the pressure there. Signal Y is transmitted to the right to the next block switching valve or connecting plate or pressure medium supply. The valve member 48 then contacts the valve seat 19 and closes off the first control passage 18.

If the pressure signal Y1 is the larger of the two incoming pressure signals,
The spherical valve member 48 resists the force of the weak spring 54 and its inner valve seat 46.
Upon hitting, the connection to the second control passage 21 is cut off. At the same time, the valve member 48 connects from the first control passage 18 to the third control passage 24 via the valve seat 19, the inclined hole 52 and the recess 53,
The larger pressure signal Y is transmitted to the right.

Therefore, by using different inserts 41, the right configuration is realized by the unchanging housings 10, 23 of the two block switching valves 11, 13. The right configuration means that on the operating side, facing the observer, there is a connecting plate containing the pressure medium inlet to the right of each block switching valve, and therefore a control block to which the maximum pressure signal must be directed. means.

FIG. 3 shows a third device 60 in a left configuration different from that according to FIG. 1, in which the same reference numbers are used for the same structural elements.

The first block switching valve 11 has a different housing 61 and the conical valve seat 19 is now obtained by the valve seat hole 62. The valve seat hole 62 is configured with a depth and an outer diameter so as to cooperate with the spherical valve member required in the right configuration for the shuttle valve function.

The second block switching valve 13 has another housing 63 with a recess 64 in the second flange face 14, which recess 64 is the second.
Partially intersects a third control passage 24 which ends away from the flange surface 14 of the.

The third insert 65 accommodated in the recess 15 has a flat seat 66 on the inner end surface 31 in addition to the sealing piece 35 on the outer end surface 34. The diameter of the flat seat 66 is larger than that of the valve seat hole 62, but smaller than the diameter of the sealing piece 35. The third insert 65 is guided in the recess with a radial gap 29 and takes on the function of the valve member in the shuttle valve by virtue of its axial mobility.

The action of the third device 60 is thus substantially identical to that of the first device 37 according to FIG.
66 determines the effective pressure surface. The coaxial indentation 64 in the housing 63 absorbs surface irregularities that may occur on the outer end surface 34 of the third insert 65 due to the center of rotation, for example during one-sided turning. Since the third control passage 24 no longer has to be drilled in the second flange face 14, its sealing strip 35 can be located on the same diameter, which results in a compact structure of the third device 60. Is promoted.

FIG. 4 shows a cross section of a fourth device 70 in the right configuration, using the same housings 61 and 63 as in FIG. The right configuration 70 and the left configuration 60 differ only in that the fourth insert 71 is different.

This fourth insert 71, like the second insert 41 according to FIG. 2, is provided in the recess 15 of the housing 61 and therefore has a shoulder 42 with a sealing ring 43. Furthermore, the fourth insert 71 comprises an inner valve seat 46, an inner part 49 and a blind hole 45 with a lateral hole 51 leading from the inner part to the annular space 38.
The outer portion 72 of the blind hole 45 is now of short construction so that it can accommodate the valve member 48. This outer part
72 leads to a turning groove 73 surrounded by a flat seat 66, from which a longitudinal hole 74 extending parallel to the blind hole 45 extends to the outer end face 34 of the fourth insert 71.

The action of the fourth device 70 largely corresponds to that of the right configuration according to the second, but the spherical valve member 48 alternates its end position outside the housing fixed valve seat hole 62 or the fourth insert 71. Can be taken in part 72. The turning groove 73 then takes on the function of the central connection of the shuttle valve, through which the selected higher pressure is transmitted.

FIG. 5 shows a fifth device 80 in which two shuttle valves are required, which are required when an alternative function is required on the adjacent flange surfaces. In FIG. 5, the second according to FIG.
The device 40 of FIG.
And Y2 are entered. The first insert 27 according to FIG. 1 is inserted into the connecting plate 81 which has the same recess 15 on its side. Therefore, the connection plate 81 has a first control passage 82.
After that, the pressure signal Y3 is input from, for example, the attached steering circuit. The maximum pressure signal Y of the pressure signals Y1 to Y3 can be taken out from the control output port 83 and transmitted to the regulator of the variable displacement pump.

The device thus realizes a left and a right configuration in the same housing, the insert being constructed as a simple turning part, preferably manufactured by axial inner and outer machining. In the left configuration an integral turning piece is sufficient, whereas in the right configuration the insert must accommodate a unique valve member of alternative function. A simple construction of the insert is generally obtained by axial sealing, preferably using metal sealing strips. In the first insert 27, a spherical sealing surface 33 having a spherical diameter smaller than the maximum diameter of the insert 27 can advantageously absorb any radial error. In the shuttle valve according to FIGS. 1 and 2, the valve member can be easily preloaded on one side to the preferred position by means of a weak spring.
In addition, the insert is configured so that if the flange surface requires two alternative functions, they can be provided facing each other as needed. In order to compensate the molding accuracy of the insert, if the flange surface covering the recess has an appropriate recess, the third
The simple and compact construction of the device according to FIGS. 4 and 5 is facilitated. In the second device 40, the spherical valve member 48 is easily prevented from being lost when the sealing cone 44 is caulked slightly inward. Similarly, the O-ring 26 in the turning groove 25 also takes on the loss-prevention function at the same time, unless the block switching valve 11 is combined from a plurality of valves into one control block.

Modifications of the illustrated embodiment are, of course, possible without departing from the spirit of the invention. It is particularly advantageous if the sealing cone 44 according to FIG. 2 is designed like a ball tip.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a block switching valve having a first device having a left configuration for selectively transmitting a pressure signal, and FIG.
Sectional drawing of the 2nd apparatus of the right structure according to the figure, FIG. 3 is sectional drawing of the 3rd apparatus of the left structure, FIG. 4 is sectional drawing of the 4th apparatus of the right structure according to FIG. FIG. 5 is a cross-sectional view of a fifth device in which the left configuration and the right configuration are doubly arranged on the adjacent flange surfaces. 10,23… Housing, 11,13… Block switching valve, 12,14
… Flange surface, 15… Concave, 16… Bottom, 18,21,24… Control passage, 19… Valve seat, 27,41… Insert, 27,48,65… Valve member.

Claims (10)

[Claims] 1. A housing (1) for a block switching valve (11).
0,61) has a blind hole-like recess (15) on the flange surface (12),
This recess (15) can be covered by the flange surface (14) of the adjacent control block element (13) and the two control passages (18,21) in the housing (10,61) are recessed (15). )
Two different magnitude pressure signals (Y1, Y2) leading to the bottom (16) of the third control passage (24) leading to the recess (15) from the adjacent control block element (13). The recess (15) has a replaceable insert (27,41,65,7) for alternative functions to block the lower signal and transmit the higher signal.
The central connection port (21) of the shuttle valve for accommodating 1) and for extracting the higher signal by this insert (27, 41, 65, 71) is the control passageway (18) in the block switching valve (11). Alternatively, the control passage (18) for introducing the pressure signal (Y1) of the block switching valve (11), which is selectively connectable to the control passage (24) in the adjacent control block element (13), has a recess. The bottom (16) of the (15) leads to the center, and the opening to the bottom (16) is configured as a conical valve seat (19), and the insert (2
7,41,65,71) is guided axially in the recess (15),
A valve member (2) of a shuttle valve movable on the longitudinal axis of the recess (15).
A hydraulic device for selecting and transmitting a pressure signal in a block switching valve, which is characterized by having the functions of 7,48,65). 2. The insert (27) itself is integrally formed as a valve member, has a central closing member (32) on its inner end surface (31), and has an annular sealing strip (35) on its outer end surface (34). ] The hydraulic device according to claim 1 characterized by having. 3. The insert (27) is guided into the recess (15) with a radial clearance (29), and the diameter of the pressure receiving surface surrounded by the sealing crosspiece (35) is equal to that of the insert ( 27. The hydraulic device according to claim 2, wherein the hydraulic device has a diameter substantially equal to that of 27). 4. Closure member (32) having a spherical sealing surface (33), said sealing surface facing the valve seat (19) in the housing (10). The hydraulic device according to item 2. 5. A valve seat (19) in which the insert (65) has a flat seat (66) facing the bottom (16) as a valve member of a shuttle valve, the flat seat having a diameter in the housing (61). A hydraulic device according to claim 2 or 3, characterized in that it is larger. 6. An insert (41; 71) having an annular ridge (44; 6) on the end face.
6) tightly and fixedly contacts the housing fixed bottom (16) with the annular ridge (44; 66) surrounding the blind hole (45), and the valve member (48) is guided in the blind hole (45). The housing fixed valve seat (19) and the inner valve seat (46) are attached to the valve member (48), and the inner valve seat (46) is inserted into the insert body (41; 71) in the recess (15). ), The second control passage (21) leads to the annular space (38) defined between the annular ridge (44; 66) and the radial sealing point (43), and the lateral connection from the blind hole (45). (52,53; 7
Claim 3, characterized in that 3,74) leads to the end face (34) of the insert (41; 71) opposite the annular ridge (44; 66). The hydraulic device described. 7. The annular ridge is a sealing cone (44), which directly surrounds the blind hole (45) and contacts the conical valve seat (19) in the housing (10) and the lateral connection is a lateral hole (52). The hydraulic device according to claim 6, wherein the hydraulic device is configured as follows. 8. The blind hole (45) in the insert (71) is coaxially opposed to the valve seat hole (62) in the housing (61) by the blind hole (45) and the valve seat hole (62). And a flat radial chamber (73) surrounded by an annular ridge (66) extends between the chamber (7
A hydraulic device according to claim 6, characterized in that a vertical hole (74) forming a horizontal connection portion is formed from 3). 9. An adjacent control block element (13) has a recess (64) coaxial with the recess (15), the control passage (24) of this control block element extending from the flange surface (14). 2. The method according to claim 1, characterized in that it terminates at a distance and partially intersects this recess (64) and the control passage (24) is on the diameter of the sealing bar (35). Hydraulic device. 10. An O-ring (26) on the flange surface (12).
2. The hydraulic device according to claim 1, characterized in that it is configured as a loss preventer for the insert (27; 41).