DE102018204854A1 - Valve assembly with a main spool and two spools - Google Patents

Abstract

The invention relates to a valve arrangement (10). According to the invention, the first and second pump channels (37, 38) are arranged directly next to one another, wherein they are respectively connected to the respectively assigned first and second control slide (51, 52) fork-like connecting channel (60) is provided by a trunk portion (63) to a first and a second branch portion (61; 62), the main slider (50) being connected to the trunk portion (63), the first branch portion (61) being peripheral is connected to the first spool (51), so that pressurized fluid from the first pump channel (37) via the first valve seat (53), further on the first branch portion (61) is conductive to the main spool (50), wherein the second branch portion (62) is circumferentially connected to the second spool (52), so that pressurized fluid from the second pump channel (38) via the second valve seat (54), further on the second branch portion (62) to the main slide (50) is conductive.

Description

The invention relates to a valve arrangement according to the preamble of claim 1.

From the EP 791 754 B1 a valve arrangement is known. According to one embodiment, a main slide and two spools are provided, wherein the spools are controlled by means of respectively associated pilot valves. The pilot valves are externally mounted on the housing, wherein they have a separate lower housing.

An advantage of the present invention is that the housing is particularly compact. The housing of a valve disc can be formed in one piece, with no lower housing, for example, for the pilot valve, are required. The flow paths for the pressurized fluid are particularly low in resistance. Next, the housing is inexpensive to produce by casting, with the machining of the Gußrohteils is limited to a minimum.

According to the independent claim it is proposed that the first and the second pump channel are arranged directly next to each other, wherein they are each connected to the end face of the respectively associated first and second control slide, wherein a fork-like branching from a trunk portion to a first and a second branch section Connecting channel is provided, wherein the main slide is connected to the stem portion, wherein the first branch portion is circumferentially connected to the first spool, so that pressurized fluid from the first pump channel via the first valve seat, further on the first branch portion is guided to the main spool, wherein the second branch portion is peripherally connected to the second spool, so that pressurized fluid from the second pump channel via the second valve seat, further on the second branch portion to the main spool is conductive. The first and the second pump channel are preferably arranged directly next to one another in the direction of the longitudinal axis. The central axis of the first and the second spool are preferably arranged in alignment. The valve assembly is preferably used with a pressurized fluid which is most preferably a liquid, such as hydraulic oil.

In the dependent claims advantageous refinements and improvements of the invention are given.

It may be provided that each of the first and a second control spool is associated with a first and a second pilot valve, wherein the center axes are arranged in each case parallel to the longitudinal axis, wherein they are arranged in alignment in the direction of the transverse axis aligned, wherein the first and the second pump channel are arranged in the direction of the longitudinal axis between the first and the second pilot valve. The first and / or the second pilot valve are preferably designed as Einschraubventile, which are installed from opposite sides of the housing forth in an associated receiving bore in the housing.

It can be provided that the central axes of the first and the second pilot valve are arranged offset along the transverse axis. Preferably, the central axis of the first pilot valve is arranged offset along the transverse axis to a central axis of the first spool, wherein the central axis of the second pilot valve along the transverse axis offset from a central axis of the second spool is arranged.

It can be provided that the first spool is arranged in the direction of the vertical axis between the first pilot valve and the main spool, wherein the second spool is arranged in the direction of the vertical axis between the second pilot valve and the main spool.

It can be provided that the housing has a first and a second sealing plane, which are aligned perpendicular to the transverse axis, wherein they are each defined by at least one sealing surface, wherein the sealing surfaces of the first and the second sealing plane facing away from each other, wherein the main slide, the first and the second spool and the connecting channel are arranged in the direction of the transverse axis between the first and the second sealing plane. Preferably, the first and the second pilot valve are arranged in the direction of the transverse axis between the first and the second sealing plane. The said sealing surfaces are flat.

It can be provided that the main slide, the first and the second spool and the connecting channel are arranged in the direction of the transverse axis centrally between the first and the second sealing plane, wherein the first and the second pilot valve in the direction of the transverse axis off-center between the first and the second second sealing level are arranged.

There may be provided a first and a second tank channel, which pass through the housing in the direction of the transverse axis, wherein they are spaced in the direction of the longitudinal axis, wherein the first tank channel is assigned in each case a separate first sealing surface in the first and in the second sealing plane, wherein second tank channel each have a separate second sealing surface in the first and is assigned in the second density level. The first and / or the second tank channel preferably pass through the housing in the region of the main slide, most preferably such that the pressure fluid can flow past one or both sides of the main slide.

It can be provided that a separate third sealing surface in the first and in the second sealing plane is assigned to each of the first and the second pump channel in common.

It can be provided that the two third sealing surfaces are penetrated by two first Zugankerbohrungen, which are spaced in the direction of the longitudinal axis, wherein the first and the second pump channel are arranged in the direction of the longitudinal axis between the first Zugankerbohrungen. The tie rod holes can be penetrated by tie rods or stud bolts.

It can be provided a second tie rod hole which passes through the housing in the direction of the transverse axis, wherein the second tie rod hole is assigned in each case a separate fourth sealing surface in the first and in the second sealing plane. Preferably, the second tie-rod bore is arranged in the vertical direction at a distance from the first tie-rod bores, wherein said tie-rod bores are most preferably arranged at opposite edge regions of the housing.

It can be provided that the main slide is disposed between two separate control covers, which are externally attached to the housing, wherein in each case a spring is accommodated in both control covers, which is supported depending on the position of the main slide on the housing or on the main slide. The two control covers and / or the two springs are preferably identical.

Protection is also claimed for a valve block which comprises at least one first valve arrangement according to the invention, wherein at least one second valve arrangement is provided, wherein all first and second valve arrangements have the same housing. The main slide and / or the first spool and / or the second spool of the first and the second valve assembly may be formed differently. The movable spool can also be replaced by immovable components that permanently close or release the relevant valve seat.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

• 1 einen Querschnitt einer erfindungsgemäßen Ventilanordnung;
• 2 eine Explosionsansicht der Ventilanordnung nach 1;
• 3 eine Seitenansicht der Ventilanordnung nach 1; und
• 4 einen Teil eines Schaltplans eines Ventilblocks mit einer erfindungsgemäßen ersten Ventilanordnung und einer zweiten Ventilanordnung.

The invention will be explained in more detail below with reference to the accompanying drawings. It shows:

• 1 a cross-section of a valve assembly according to the invention;
• 2 an exploded view of the valve assembly according to 1 ;
• 3 a side view of the valve assembly according to 1 ; and
• 4 a part of a circuit diagram of a valve block having a first valve arrangement according to the invention and a second valve arrangement.

1 shows a cross section of a valve arrangement according to the invention 10 , The valve arrangement 10 includes a housing 30 in which a main slider 50 with respect to a longitudinal axis 11 is received linearly movable. A vertical axis 13 runs perpendicular to the longitudinal axis 11 , wherein a transverse axis (No. 12 in 3 ) perpendicular to the longitudinal and the vertical axis 11 ; 13 runs. The housing 30 is designed in the manner of a valve disc, wherein it is produced in the casting process, for example, gray cast iron or aluminum.

The housing 30 has a first and a second pump channel 37 ; 38 and a first and a second tank channel 39 ; 40 which the housing 30 enforce in the direction of the transverse axis. The named channels 37 - 40 are arranged so that each results in a continuous channel when multiple housing 30 along the transverse axis are grown together to obtain a valve block.

At one perpendicular to the vertical axis 13 aligned side surface of the housing 30 are a first and a second work connection 72 . 73 provided, which are closed in the present case with a protective cover. In operation, a hydraulic cylinder, a hydraulic motor or another actuator is connected there. Both work connections 72 ; 73 are each with an associated pressure relief valve 74 secured against overpressure. The two identical pressure relief valves 74 are designed as Einschraubventile whose central axes parallel to the longitudinal axis 11 aligned, being in alignment on opposite sides of the housing 30 are arranged. When the pressure at the relevant work connection 72 ; 73 one on the pressure relief valve 74 is exceeded via the pressure limiting valve 74 a connection between the relevant work connection 72 ; 73 and the relevant tank channel 39 ; 40 open. It should be noted that the two tank channels 39 ; 40 at a height with the main slide 50 are arranged. In 2 they are more recognizable.

To the skin slider 50 are in 1 From left to right, the second tank channel is considered 40 , the second work connection 73 , a trunk section 63 a connection channel 60 , the first work connection 72 and the first tank channel 39 connected. In the in 1 represented by the two springs 71 preloaded middle position of the main slider 50 there is no fluid connection between said channels 40 ; 73 ; 60 ; 72 ; 39 , When the main slider 50 by pressurizing the in 1 left control cover 70 is moved to the right, the trunk section 63 with the second work connection 73 and the first work connection 72 with the first tank channel 39 connected. When the main slider 50 by pressurizing the in 1 right control cover 70 is shifted to the left, the trunk section 63 with the first work connection 72 and the second work connection 71 with the second tank channel 40 connected. In both cases, the opening cross sections are adjusted continuously. In the main valve 50 are preferably (not shown) provided fine control notches for this purpose. The structure of the control cover 70 is the subject of DE 10 2016 212 311 A1 the entire contents of which are referred to and incorporated in the content of the present application. The two control covers 70 are preferably formed identically, whereby they are flip-symmetrical about 180 ° on the housing 30 are attached.

The connection channel 60 branches fork-like from the trunk section 63 on a first and a second branch section 61 ; 62 , The first branch section 61 is circumferentially to a first spool 51 connected, the second branch section 62 on the circumference of a second spool 52 connected. The first and the second spool are parallel to the longitudinal axis 11 movable in the housing 30 recorded, with their central axes 55 ; 56 in an alignment midway between the first and second sealing planes (Nos. 31, 32 in 3 ) are arranged. They are installed from opposite sides into the housing. By means of the first and the second control slide is in each case an associated first and second valve seat 53 ; 54 closed fluid-tight. The first and the second pump channel 37 ; 38 are frontally to the respectively associated first and second spool 51 ; 52 connected. As a result, pressurized fluid from the first pump channel 37 over the first valve seat 53 , continue via the connection channel 60 to the main slider 50 conductive, wherein pressurized fluid from the second pump channel 38 over the second valve seat 54 , continue via the connection channel 60 to the main slider 50 is conductive. To the first and the second pump channel 37 ; 38 Preferably, a separate pump is connected in each case, so that by means of the first and the second control slide 51 ; 52 is adjustable in each case, which fluid flow from the two pumps for the supply of the valve assembly 10 associated actuator is provided.

The position of the first and second spool 51 ; 52 comes with a respective associated pilot valve 14 ; 15 set. The combination of spool and pilot valve is the subject of DE 10 2014 204 070 A1 the entire contents of which are referred to and incorporated in the present application. The special feature of this combination is that the free flow cross-section or the flow resistance at the respective valve seat 53 ; 54 essentially proportional to the electrical control on the relevant pilot valve 14 ; 15 is.

The present invention aims to provide the previously discussed components in a particularly compact and inexpensive to produce housing 30 accommodate. The flow paths of the pressurized fluid should be particularly short and low-resistance.

For this purpose, the first and the second pump channel 37 ; 38 in the direction of the longitudinal axis 11 immediately adjacent to each other between the first and the second pilot valve 14 ; 15 arranged. The pilot valves 14 ; 15 are arranged in alignment in the direction of the transverse axis, being from opposite sides of the housing 30 are installed ago and indeed in the manner of a screw-in valve. The first and second spools 51 ; 52 are in the direction of the vertical axis 13 each between the associated first and second pilot valve 14 ; 15 and the main slider 50 arranged. The first and the second pump channel 37 ; 38 are in the direction of the vertical axis 13 on the from the work connections 72 ; 73 opposite side of the housing 30 arranged.

Attention is still on the first two and the second tie rod bore 41 ; 42 which the housing 30 in the direction of the transverse axis 12 prevail, taking in the direction of the vertical axis 13 at opposite edges of the housing 30 are arranged. Into the tie rod holes 41 ; 42 in each case a (not shown) tie rod is installed, which passes through all the housing of a valve block, wherein the corresponding valve discs are held together firmly by the tie rods. The first and the second pump channel 37 ; 38 are in the direction of the longitudinal axis 11 between the first two tie rod holes 41 arranged.

2 shows an exploded view of the valve assembly 10 to 1 from the side the first density plane (No. 31 in 3 ) ago. The first density level 31 is made by a total of four separate sealing surfaces 33 - 36 defined, which are each formed just, wherein they are arranged in a plane. In the 2 invisible second sealing plane (No. 32 in 3 ) is relative to a median plane of the housing 30 essentially mirror-symmetrical to the first sealing plane. There, however, is the first and second pump channels 37 ; 38 and the first and second tank channels 39 ; 40 each provided with an annular groove for receiving a sealing ring to improve the seal.

The four separate sealing surfaces 33 - 36 are each at an associated side edge of the housing 30 arranged so that maximally large spans between the sealing surfaces 33 - 36 result. It is therefore not to be feared that the corresponding sealing gaps under the influence of the inside of the housing 30 widening acting hydraulic forces. The first and the second sealing surface 33 ; 34 are respectively the first and the second tank channel 39 ; 40 assigned, while this completely surrounded or circumscribe. The third sealing surface 35 surrounds or delimits the first and the second pump channel 38 ; 39 and the first two tie rod holes 41 , wherein said channels 38 ; 39 or drilling 41 completely surrounded by the third sealing surface or are delimited. The fourth sealing surface 36 is the second tie rod hole 42 assigned, while this completely bounded. Off the sealing surfaces 33 - 36 is the case 30 formed reset relative to the first and the second sealing plane. As a result, on the one hand material is saved. On the other hand, the clamping force caused by the tie rods is transmitted solely by the sealing surfaces, so that there is a high surface pressure and thus a good seal.

Attention is still on the spring 57 and the screw plug 58 , respectively the first and the second spool 51 ; 52 assigned. The feather 57 is between the respective spool 51 ; 52 and the screw plug 58 installed under preload. The screw plug 58 is in the case 30 screwed so that it is closed fluid-tight.

3 shows a side view of the valve assembly 10 to 1 , The viewing direction runs in the direction of the longitudinal axis. The side views from left and right in 1 are identical.

The first and second sealing levels can be seen 31 ; 32 , The entire valve arrangement 10 is between these density levels 31 ; 32 arranged so that several valve arrangements 10 along the transverse axis 12 can be grown together, each with a second 32 at a first sealing level 31 is applied.

The pressure relief valve 74 , the main slider (No. 50 in 1 ) and the spools (# 51, 52 in 1 ) are exactly in the middle between the first and the second sealing plane 31 ; 32 arranged. The pilot valves 14 ; 15 are off-center between the first and second sealing levels 31 ; 32 arranged to save space.

4 shows a part of a circuit diagram of a valve block 20 with a first valve arrangement according to the invention 21 and a second valve assembly 22 , The first valve arrangement 21 corresponds to the in 1 - 3 illustrated valve assembly. The symbols for the main valve 50 , the spool valve 51 ; 52 and the pressure relief valves 74 are marked accordingly.

The present part of the valve block 20 comprises a total of four valve disks or valve arrangements. The first valve arrangement 21 forms the most common variant. The second valve arrangement 22 In contrast, is simplified. In particular, the two spools were by a closure piece and a check valve 76 replaced. The corresponding actuator can thus only from the second pump channel 38 supplied with pressurized fluid, but not from the first pump channel 37 ago. It is understood that the corresponding pilot valves in the second valve assembly 22 were also omitted. However, the first and second valve assemblies have an identical housing.

Next is a third valve arrangement 23 provided all the functionalities of the first valve assembly 21 Includes, in addition, a pilot-operated check valve 77 is installed at the first work connection. This modification requires a slight change to the otherwise identical housing. The housing according to the invention is currently designed so that such modifications are carried out with little effort. As a result, the main body can be manufactured inexpensively in large numbers.

LIST OF REFERENCE NUMBERS

10

valve assembly

11

longitudinal axis

12

transverse axis

13

vertical axis

14

first pilot valve

15

second pilot valve

16

Center axis of the first pilot valve

17

Center axis of the second pilot valve

20

manifold

21

first valve arrangement

22

second valve arrangement

23

third valve arrangement

30

casing

31

first sealing level

32

second sealing level

33

first sealing surface

34

second sealing surface

35

third sealing surface

36

fourth sealing surface

37

first pump channel

38

second pump channel

39

first tank channel

40

second tank channel

41

first tie rod bore

42

second tie rod bore

50

main slide

51

first spool

52

second control slide

53

first valve seat

54

second valve seat

55

Center axis of the first spool

56

Center axis of the second spool

57

feather

58

Screw

60

connecting channel

61

first branch section

62

second branch section

63

trunk section

70

control cover

71

feather

72

first work connection

73

second work connection

74

Pressure relief valve

75

closing piece

76

check valve

77

check valve

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 791754 B1 [0002]
• DE 102016212311 A1 [0022]
• DE 102014204070 A1 [0024]

Claims (13)

Valve assembly (10) comprising a housing (30) in which a main slide (50) is received linearly movable with respect to a longitudinal axis (11), wherein a transverse axis (12) is aligned perpendicular to the longitudinal axis (11), wherein a vertical axis (13) perpendicular to the longitudinal and to the transverse axis (11; 12) is aligned, wherein a first and second pump channel (37; 38) are provided, which pass through the housing (30) respectively in the direction of the transverse axis (12), wherein a first and a second Spool (51; 52) are provided, which are arranged in the direction of the vertical axis (13) on the same side next to the main slide (50), wherein they are received in the direction of the longitudinal axis (11) linearly movable in the housing (30) in each case a first or a second valve seat (53, 54) can be closed by means of the first and the second control slide (51, 52), characterized in that the first and the second pump channel (37, 38) are arranged directly next to each other, wherein they each face on the respectively associated first and second control slide (51; 52), wherein a connection channel (60) branching fork-like from a trunk section (63) to a first and a second branch section (61; 62) is provided, the main slider (50) being connected to the trunk section (63), wherein the first branch portion (61) is peripherally connected to the first spool (51), so that pressurized fluid from the first pump channel (37) via the first valve seat (53), further on the first branch portion (61) to the main spool (50) is conductive wherein the second branch portion (62) is peripherally connected to the second spool (52), so that pressurized fluid from the second pump channel (38) via the second valve seat (54), further on the second branch portion (62) to the main spool (50) passable is. Valve arrangement after Claim 1 wherein the first and the second control spool (51; 52) each have a first and a second pilot valve (14; 15) is assigned, with their central axes (16; 17) are each arranged parallel to the longitudinal axis (11), wherein Direction of the transverse axis (12) are arranged in an aligned, wherein the first and the second pump channel (37; 38) in the direction of the longitudinal axis (11) between the first and the second pilot valve (14; 15) are arranged. Valve arrangement after Claim 2 wherein the central axes (16; 17) of the first and second pilot valves (14; 15) are offset along the transverse axis (12). Valve arrangement according to one of Claims 2 or 3 in which the first control slide (51) is arranged in the direction of the vertical axis (13) between the first pilot valve (14) and the main slide (50), the second control slide (52) being arranged in the direction of the vertical axis (13) between the second pilot valve (13). 15) and the main slide (50) is arranged. A valve assembly according to any one of the preceding claims, wherein the housing (30) has first and second sealing planes (31; 32) oriented perpendicular to the transverse axis (12), each defined by at least one sealing surface (33-36) wherein the sealing surfaces (33-36) of the first and second sealing planes (31; 32) face away from each other, wherein the main spool (50), the first and second spools (51; 52) and the communication passage (60) are in the direction the transverse axis (12) between the first and the second sealing plane (31; 32) are arranged. Valve arrangement after Claim 5 , backward on Claim 3 in that the main slide (50), the first and the second control slide (51; 52) and the connecting channel (60) are arranged in the direction of the transverse axis (12) centrally between the first and the second sealing plane (31; 32) the first and the second pilot valve (14; 15) in the direction of the transverse axis (12) off-center between the first and the second sealing plane (31; 32) are arranged. Valve arrangement after Claim 5 or 6 wherein the first and second sealing planes (31; 32) are each associated with a plurality of sealing surfaces (33-36) arranged such that the first sealing plane (31) of one housing (30) adjoins the second sealing plane (32) of another Housing (30) can be attached such that mutually associated sealing surfaces (33 - 36) sealingly abut each other. Valve arrangement after Claim 7 in which a first and a second tank channel (39, 40) are provided, which pass through the housing (30) in the direction of the transverse axis (12), being spaced in the direction of the longitudinal axis (11), the first tank channel (39) in each case a separate first sealing surface (33) in the first and in the second sealing plane (31; 32) is assigned, wherein the second tank channel (40) each have a separate second sealing surface (34) in the first and in the second sealing plane (31; 32) is assigned. Valve arrangement after Claim 7 or 8th wherein the first and the second pump channel (37; 38) are each assigned a separate third sealing surface (35) in the first and in the second sealing plane (31; 32). Valve arrangement after Claim 9 wherein the two third sealing surfaces (35) are penetrated by two first tie - bolt holes (41) which are spaced in the direction of the longitudinal axis (11), the first and second pumping channels (37; Direction of the longitudinal axis (11) between the first Zugankerbohrungen (41) are arranged. Valve arrangement according to one of Claims 7 to 10 in which a second tie rod bore (42) is provided, which passes through the housing (30) in the direction of the transverse axis (12), the second tie rod bore (42) each having a separate fourth sealing face (36) in the first and second sealing levels (FIG. 31, 32). Valve arrangement according to one of the preceding claims, wherein the main slide (50) between two separate control covers (70) is arranged, which are externally attached to the housing (30), wherein in both control covers (70) each have a spring (11) is accommodated, which depending on the position of the main slide (50) on the housing (30) or on the main slide (50) is supported. Valve block (20) with at least one first valve arrangement (21), which is designed according to one of the preceding claims, wherein at least one second valve arrangement (22) is provided, wherein all first and second valve assemblies (21; 22) have the same housing (30).

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