DE102010006464A1 - Hydraulic arrangement, has rinsing unit controlling pressure medium connection between pressure lines and tank, and hydropneumatic accumulator connected with pressure lines by slide valve - Google Patents

Abstract

The arrangement has a closed hydraulic circuit in which a hydraulic motor (4) and a hydro pump (2) are arranged. The motor and the pump are connected with each other by low pressure lines (6, 8). A feed unit (14) guides pressurizing medium from a tank (12) into the respective low pressure lines. A rinsing unit (10) controls pressure medium connection between the pressure lines and the tank. A hydropneumatic accumulator (16) is connected with the pressure lines by a slide valve (18) e.g. flush valve, loading valve and feeding valve.

Description

The invention relates to a hydraulic system according to the preamble of patent claim 1.

In the DE 102 59 315 B3 such a hydraulic arrangement is disclosed. Here, a hydraulic motor driving a hydraulic pump is provided in a closed hydraulic circuit, which are connected to each other via two pressure lines. A pressure medium is conveyed as a function of the conveying direction of the hydraulic pump via one of the two pressure lines to the hydraulic motor and passes from this via the pressure-lower pressure line back to the hydraulic pump. Between the pressure lines, a rinsing unit for connecting the lower-pressure pressure line is arranged with a tank. The flushing unit has a flush valve designed as a directional control valve and a pressure limiting valve arranged downstream of the flushing valve. In the pressure medium flow path between the purge valve and the pressure relief valve, a throttle is arranged. The pressure relief valve is acted upon by the pressure between the throttle and the pressure relief valve in an opening direction and a spring force in the closing direction.

This solution has the disadvantage that in the use of the flushing unit considerable pressure fluctuations in the hydraulic system can occur, which can lead to an impairment of the function of the hydraulic system.

In contrast, the present invention seeks to provide a hydraulic system with a closed hydraulic circuit, which ensures pressure fluctuations and high reliability.

According to the invention, a hydraulic system with a closed hydraulic circuit to a hydraulic motor and a hydraulic pump, which are in pressure fluid communication via two pressure lines. With a feed unit, a pressure medium from a tank in the respective pressure-lower pressure line can be conveyed. With a rinsing unit, a pressure medium connection between the respective lower-pressure pressure line and the tank can be opened. A hydraulic accumulator is connected via a slide valve with the respective lower-pressure pressure line.

This solution has the advantage that a hydraulic accumulator with the pressure lower pressure line is connected to the closed hydraulic circuit with low device complexity. As a result, for example, pressure fluctuations in the hydraulic circuit can be compensated in a simple manner. Furthermore, the hydraulic accumulator can serve in addition to or instead of the feed unit to the pressure medium supply for the pressure lower pressure line in the use of the flushing unit.

In an advantageous embodiment of the invention, the slide valve is a conventional flush valve, which corresponds for example to a flush valve of the flushing unit. Thus, the arrangement in this regard has two identical parts, whereby the assembly cost is reduced.

Preferably, the slide valve is used as a loading and feed valve, whereby the hydraulic accumulator can be charged via this, for example by the feed unit and can deliver via this pressure medium to the pressure-lower pressure line. Thus, several functions are possible via a single slide valve.

For pressure protection of the hydraulic accumulator branches off in the pressure medium flow path between the loading and feed valve and the tank from a pressure relief valve.

In another advantageous embodiment, a flushing valve of the flushing unit for connecting the pressure lower pressure line to the tank can be additionally used as the charge and feed valve to save components, wherein the hydraulic accumulator downstream of this purge valve is connected.

Advantageously, downstream of the purge valve, a pressure-adjusting valve with an upstream diaphragm is arranged. The valve spool of the pressure-adjusting valve is acted upon in an opening direction by the pressure in the pressure medium flow path between the purge valve and orifice and in the closing direction with a spring force. The hydraulic accumulator is then advantageously connected to this pressure fluid flow path.

Device technology with little effort, the charging and feed valve may be formed in a valve housing which is seated on a housing of the hydraulic motor. This embodiment is also characterized by an extremely compact design.

Alternatively, the flushing unit can sit in a housing block on the housing of the hydraulic motor and have a connection for the hydraulic accumulator.

Other advantageous developments of the invention are the subject of further subclaims.

In the following preferred embodiments of the invention will be explained in more detail with reference to schematic drawings. Show it:

1 a hydraulic circuit diagram of a hydraulic arrangement according to a first embodiment;

2 in a longitudinal sectional view of a flush valve according to the first embodiment;

3 a section of a hydraulic circuit diagram with the hydraulic arrangement according to a second embodiment;

4 a hydraulic circuit diagram with the hydraulic arrangement according to a third embodiment;

5 in a cross-sectional view of a hydraulic motor with a purging unit and a loading and feed valve according to the first or second embodiment;

6 in a cross-sectional view of the hydraulic motor of the 5 with a hydraulic accumulator;

7 in a cross-sectional view of a hydraulic motor with a flushing unit and a hydraulic accumulator according to the third embodiment; and

8th in a cross-sectional view of the flushing unit 7 ,

In the 1 is a circuit diagram of a hydraulic system with a closed hydraulic circuit according to a first embodiment shown. This drives a hydraulic pump 2 a hydraulic motor 4 at. The trained as adjusting hydraulic pump 2 promotes pressure medium in a first in the 1 upper or a second in the 1 lower pressure line 6 respectively. 8th to which the hydraulic motor 4 connected. About a flushing unit 10 is a pressure medium connection between the respective lower pressure line 6 respectively. 8th and a tank 12 openable. About a food unit 14 will pressure fluid from the tank 12 in the respective pressure lower pressure line 6 or 8th guided. Through the rinsing and feeding unit 10 . 14 is an exchange of pressure medium in the closed hydraulic circuit allows, with which heat and dirt particles are discharged.

To compensate for pressure fluctuations in the closed hydraulic circuit, in particular in the use of the food and / or rinsing unit 14 respectively. 10 , is a hydraulic accumulator 16 via a charge and feed valve, which serves as a slide valve 18 is formed, with the respective pressure lower pressure line 6 respectively. 8th connectable.

In the following, only the essential features of the hydraulic system for understanding the invention are shown. For more information about the closed hydraulic circuit with the hydraulic pump 2 , the hydraulic engine 4 and the rinsing and feeding unit 10 . 14 can be used, for example, on the data sheet RD 95 512 / 12.98 of the applicant.

The hydraulic pump 2 is via a drive shaft 20 driven by a drive unit, not shown. To pressure medium either in the first or second pressure line 6 . 8th to promote is the hydraulic pump 2 formed as adjustable by swiveling.

About the drive shaft 20 will be next to the hydraulic pump 2 another feed pump 22 the food unit 14 driven. This is via one on a tank connection of the feed pump 22 connected tank line 24 with the tank 12 connected. For filtering from the feed pump 22 conveyed pressure medium is in the tank line 24 a pressure medium filter 26 intended. At a pressure connection of the feed pump 22 is a supply line 28 the food unit 14 connected. From this branches a first and second connection line 30 and 32 starting with the first or second pressure line 6 respectively. 8th are connected. In every connection line 30 and 32 is one in the pressure fluid flow away from the feed pump 22 opening check valve 34 respectively. 36 arranged. Each parallel to the check valve 34 and 36 is a pressure relief valve 38 respectively. 40 to the connection line 30 respectively. 32 connected. That in the 1 upper pressure relief valve 38 serves to limit the pressure of a pressure in the upper first pressure line 6 and the lower pressure relief valve 40 to secure the lower second pressure line 8th , wherein upon reaching a predetermined maximum pressure in the pressure higher pressure line 6 or 8th the associated pressure relief valve 38 respectively. 40 a pressure fluid connection between the pressure lines 6 and 8th aufsteuert. To limit the feed pressure in the supply line 28 is to this another pressure relief valve 42 connected, via which a connection to the tank 12 is aufsteuerbar.

Through the food unit 14 is thus via the feed pump 22 Pressure fluid from the tank 12 over the tank line 24 , the supply line 28 to the pressure lower pressure line 6 respectively. 8th over the connecting line 30 respectively. 32 conveyed.

About the flushing unit 10 is the pressure lower pressure line 6 respectively. 8th with the tank 12 connectable. The flushing unit 10 has a flush valve designed as a switching valve 44 on. This is a 3/3-way valve, which is disclosed for example in the data sheet RD 95 512 / 12.98 of the applicant. A first flushing line 46 branches from the first pressure line 6 and is to a working port A of the purge valve 44 connected, and a second purge line 48 branches from the second pressure line 8th from and is to a working port B of the purge valve 44 connected. About a tank connection T is the purge valve 44 with an intermediate line 50 connected to an input port of a pressure switch valve 52 or pressure relief valve is connected. A valve spool of the purge valve 44 is centered by a spring centering with two springs in a middle position 0, in which the working ports A, B and the tank port T are locked. About a first of the first purge line 46 branching control line 54 in which a throttle is arranged, the valve spool is acted upon in the direction of a first switching position a with a control pressure. About a second on the purge line 48 connected control line 56 , in which also a throttle is arranged, the valve spool in the direction of a switching position b can be acted upon by a control pressure. The valve spool of the purge valve 44 is thus switched to the switching position a when the first pressure line 6 the higher pressure is or in the switching position b, if the second pressure line 8th the higher pressure is. In the switching position a is the working port B to the tank port T and thus the second purge line 48 or the pressure line 8th with the intermediate line 50 connected. In contrast, in the switching position a of the working port A with the tank port T and thus the first purge line 46 or the pressure line 6 me the intermediate line 50 in pressure medium connection.

About the pressure switch valve 52 is a pressure medium connection to the tank 12 openable. For this purpose, this points next to the input connection for the intermediate line 50 an outlet port for one with the tank 12 connected tank line 58 on. The operation of the pressure switching valve 52 corresponds to that of a pressure relief valve and has a valve body which is tensioned by a spring in a closed position, and the one with the intermediate line 50 connected control line 60 in the direction of opening positions with a control pressure can be acted upon. Upstream of the pressure switching valve 52 is a blind 62 arranged, the control line 60 in the pressure medium flow path between the diaphragm 62 and the purge valve 44 branches.

The following is the operation of the closed hydraulic circuit in 1 along with the flushing unit 10 and the food unit 14 explained. It is assumed by way of example that the pressure switch valve 52 at a pressure greater than 16 bar and the pressure relief valve 42 opens at a pressure of greater than 30 bar. Furthermore, a state is assumed in which the hydraulic pump 2 and the hydraulic motor 4 be operated such that the first pressure line 6 the lower pressure is. In this first pressure prevail, which is smaller than 16 bar. The flush valve 44 , that at a pressure difference of for example 3 to 5 bar between the two pressure lines 6 . 8th switches, is switched to the switching position b. The feed pump 22 now promotes via the first pressure line 6 opening check valve 34 Pressure medium in the pressure line 6 so that the pressure rises there. When the pressure reaches 16 bar, the pressure switch opens 52 , An amount of pressure fluid or flushing amount, through the flow area of the aperture 62 and the pressure in the first pressure line 6 is determined, thus flows to the tank 12 from. The pressure in the first pressure line 6 continues to rise above 16 bar because of the feed pump 22 promotes more pressure medium than at a pressure of 16 bar over the aperture 62 flows. Finally, the pressure in the first pressure line reaches 6 30 bar, so the pressure relief valve 42 opens and limits the low or feed pressure. The over the flushing unit 10 to the tank effluent or rinsed pressure fluid quantity is now given by the flow area of the aperture 62 and by the pressure difference across the aperture 62 at the rate of 30 bar.

According to the invention, to compensate for pressure fluctuations in the closed hydraulic circuit, in particular in the use of the rinsing and feeding unit 10 . 14 that's over the slide valve 18 with the first or second pressure line 6 . 8th connectable hydraulic accumulators 16 intended. That in a valve housing 63 trained slide valve 18 serves as a charge and feed valve, which is the hydraulic accumulator 16 with the respective lower pressure line 6 respectively. 8th combines. The slide valve 18 is according to the purge valve 44 the rinsing unit 10 formed (see data sheet RD 95 512 / 12.98 of the Applicant), which is extremely inexpensive simply another flush valve can be used for this purpose.

A working port A of designed as a 3/3-way valve spool valve 18 is over a first branch line 64 with the first pressure line 6 and a working port B via a second branch line 66 with the pressure line 8th connected. At a storage port S of the spool valve 18 is the hydraulic accumulator 16 via a storage line 68 connected. A valve spool of the slide valve 18 is biased via a spring centering in a middle position 0, with control pressure of one of the first branch line 64 branching control line 70 in a switching position a and at a control pressure of one of the second branch line 66 branching control line 72 switchable to the switching position b. In the switching position a is the second pressure line 8th with the storage line 68 and in the switching position b, the first pressure line 6 with the storage line 68 in pressure medium connection, whereby always the pressure lower pressure line 6 respectively. 8th with the hydraulic accumulator 16 connected is.

When the hydraulic accumulator 16 it is a low-pressure accumulator which can be biased for example to 10 bar and by the supply of 1 liter of pressure medium to 30 bar can be charged. If the pressure falls in the lower pressure line 6 respectively. 8th under the accumulator pressure of the hydraulic accumulator 16 , flows from this over the case here used as a feed valve spool valve 18 Pressure medium in the pressure lower pressure line 6 respectively. 8th , If the pressure in the pressure-lower pressure line is greater than the accumulator pressure, then, conversely, pressure medium flows from the pressure-lower pressure line via the slide valve used as a loading valve 18 to the hydraulic accumulator 16 , whereby this is charged.

2 represents in a cross-sectional view of a simplified structural design of the slide valve 18 out 1 This has a valve body 63 which is from a valve bore 76 is interspersed, in which a valve spool 78 is guided in a sliding manner. Its in the 2 left end face 80 is with a first pressure chamber 82 and his right side 84 with a second pressure chamber 86 in pressure medium connection. The pressure chambers 82 . 86 are due to radial extensions of the valve bore 76 educated. In the 2 is the valve spool 78 shown in its centered middle position. Between the two pressure chambers 82 . 86 open in the longitudinal direction of the valve bore 76 spaced apart a first and a second working channel 88 . 90 into the valve bore 76 the with the working port B or A off 1 are connected.

Midway between the two working channels 88 . 90 branches off the valve bore 76 one with the storage port S, see 1 , connected memory channel 92 from. The valve spool 78 points in each case in the area of the working channel 88 respectively. 90 a radial collar 94 respectively. 96 on. The two radial leagues 94 and 96 limit one with the memory channel 92 in pressure medium connection standing valve space 98 , Furthermore, the radial frets 94 . 96 and the valve spool 78 designed such that the first and second pressure chamber 82 and 86 each with the first and second working channel 88 respectively. 90 are in fluid communication and the valve spool 78 thus the end face with a control pressure of the branch lines connected to the working ports A and B, respectively 64 respectively. 66 out 1 can be acted upon.

end 100 . 102 of the valve spool 78 have about the same diameter as a middle one of the radial collars 94 . 96 limited section of the valve spool 78 on. One stop ring each 104 respectively. 106 is on the respective end section 100 respectively. 102 guided. The two pressure chambers 82 and 86 are each through a pot-shaped in the respective pressure chamber 82 respectively. 86 screwed closure element 108 respectively. 110 locked. On an inner bottom surface of the respective closure element 108 and 110 each supports a valve spring 112 respectively. 114 from and acts on the respective stop ring 104 respectively. 106 with a spring force, whereby this against a through the valve housing 63 Graded pressure chamber 82 respectively. 86 formed and the closure element 108 respectively. 110 assigning ring surface 116 respectively. 118 in the position shown the valve spool 78 is curious. Will the valve spool 78 from in the 2 shown middle position moved to the left, resulting in the 1 the switching position corresponds to a, then a pressure medium connection between the working channel 88 and the memory channel 92 turned on. The left stop ring 104 is doing by a between the Radialbund 94 and the reclassified end portion 100 formed annular shoulder of the valve spool 78 in the direction of the left closure element 108 moved. The displacement of the valve spool 78 ends to the left when the moving stop ring 104 on a stop ring 104 assigning ring end face 120 the closure element 108 strikes. Is the pressure in the left first pressure chamber? 82 larger than in the right second pressure chamber 86 , then the valve spool 78 in the 2 moved to the right. If this is done from the previously described switching position a, then the left stop ring 104 together with the valve spool 78 moved to the right until this on the ring surface 116 is applied. In contrast, the right stop ring 106 from the ring surface 118 moves away and wanders with the valve spool 78 to the right, up to an annular end face 122 the closure element 110 , whereby the displacement of the valve spool 78 is limited. In this position of the valve spool 78 is the right working channel 90 over the valve space 98 with the memory channel 92 connected.

Further information regarding the construction of the slide valve 18 can be found for example in the publication DE 10 2005 051 324 A1 in which also such a slide valve or flushing valve is shown.

3 shows a section of the hydraulic system according to a second embodiment. In contrast to the first embodiment of the 1 is the hydraulic accumulator 16 via a pressure relief valve 124 hedged. This is together with the gate valve 18 in a valve housing or housing block 126 arranged. This has a first and second housing connection MA and MB, with the branch line 64 respectively. 66 connected and to the first and second pressure line 6 respectively. 8th are connected. The pressure relief valve 124 has a pressure port P via a connection channel 128 with the storage line 68 connected is. This opens into a storage connection MS of the housing block 126 at which the hydraulic accumulator 16 over another storage line 130 connected. Furthermore, the pressure relief valve has 124 a tank connection T, which has a tank channel 132 with one in the housing block 126 trained tank connection MT is connected, in turn, for example, via a tank, not shown, with a tank in fluid communication. A valve body of the pressure relief valve 124 is via one of the memory line 68 branching control channel 134 in the opening direction with the accumulator pressure of the hydraulic accumulator 16 and acted upon in the closing direction by a spring force of a spring. The pressure relief valve 124 opens, for example, at a pressure of 50 bar.

4 illustrates a circuit diagram of the hydraulic system according to a third embodiment. The hydraulic accumulator 16 is not here as in the first two embodiments, an additional slide valve 18 connected to the closed hydraulic circuit, but to a flushing unit 136 connected, whereby a slide valve is advantageously saved. This is in a separate valve housing or housing block 138 educated. The first flushing line 46 is at a working port MA of the housing block 138 and the second purge line 48 connected to a working port MB, which in each case via a connecting line to the first and second pressure line 6 respectively. 8th in pressure medium connection. The tank line 58 opens into a tank channel MT of the housing block 138 that one with the tank 12 connected leakage line 139 the hydraulic motor 4 connected. The hydraulic accumulator 16 is via a storage line 140 with a storage port MS of the housing block 138 connected, this via a memory channel 142 with the intermediate line 50 between the aperture 62 and the purge valve 44 connected is. Parallel to the pressure switch valve 52 is a throttle 144 in the housing block 138 arranged.

The flush valve 44 serves in this third embodiment thus also as a charging and feed valve for the hydraulic accumulator 16 , bringing the slide valve 18 is saved from the previous embodiments 1 and 2. This leads to a much lower device complexity.

5 shows an advantageous arrangement of the slide valve 18 out 1 or the slide valve 18 together with the pressure relief valve 124 out 3 , in a cuboid valve housing or housing block 150 on the motor housing 152 the hydraulic motor 4 from the 1 sits, in a schematic longitudinal section view.

In the following, only the essential parts of the hydraulic motor for the understanding of the invention 4 described. Further information is disclosed, for example, in the data sheet RD 91610 / 07.09 of the applicant.

The hydraulic motor 4 has a shoot shaft 154 that with a drive disk 156 is firmly connected. The shoot shaft 154 is about rolling bearings 158 supported. With the drive disc 156 are articulated a plurality of pistons 162 connected in the cylinder bores of a cylinder drum 163 are guided axially displaceable. The cylinder drum 163 is based on a control disk 164 off, via a swivel device 165 is pivotable. In the motor housing 152 a first and second unillustrated pressure channel is formed, each with the first and second pressure line 6 respectively. 8th from the 1 are connected. The pressure channels are standing. with the piston 162 in the cylinder bores limited displacements of the cylinder drum 163 for driving the hydraulic motor 4 in active connection. The branch lines 64 respectively. 66 from the 1 or the working ports MA or MB of the housing block 126 out 3 are connected in a manner not shown with the first and second pressure channel. The connection takes place, for example, simply through holes in the motor housing 152 ,

In the 5 it can be seen that the housing block 150 extremely compact and space-saving at one of the drive shaft 154 facing away from the housing side 166 of the motor housing 152 can be arranged. The flushing unit 10 from the 1 is in the 5 at the bottom of the motor housing 152 attached.

In the 6 is the hydraulic engine 4 from the 5 shown in a cross-sectional view, wherein the housing block 150 not shown cut. In the 6 is also the hydraulic accumulator 16 from the 1 and 3 shown in a perspective view, via the memory line 68 (please refer 1 ) respectively. 130 (please refer 3 ) to the housing block 150 connected. In this illustration, the cylinder displacements with the cylinder cylinder 163 out 5 operatively connected first and second pressure channels 167 . 168 shown. For fastening the housing block 150 on the motor housing 152 used for example in the corners trained screw 170 ,

7 shows the hydraulic motor 4 in a longitudinal sectional view together with the flushing unit 136 from the 4 to which the hydraulic accumulator 16 over the storage line 140 connected. The flushing unit 136 This corresponds essentially to the rinsing unit 10 from the 5 However, they do not have a memory channel 142 having. The construction of the flushing unit 136 from the 7 is in the following 8th shown.

8th shows in a cross-sectional view of the flushing unit 136 from the 7 , This corresponds to large parts of the slide valve 18 from the 2 , but in addition are the aperture 62 , the pressure relief valve 52 and the memory channel 142 educated. The pressure relief valve 52 is over the aperture 62 with the valve room 98 connected. The memory channel 142 also flows into this valve chamber 98 ,

Disclosed is a hydraulic system with a closed hydraulic circuit, in which a hydraulic motor and a hydraulic pump are arranged. These are connected to each other via two pressure lines. Here, a feed unit is provided, with the pressure medium from a tank in which the respective lower pressure having pressure line can be conveyed. With a rinsing unit, a pressure medium connection between the low-pressure pressure line and the tank is turned on. Advantageously, a hydraulic accumulator can be connected via a slide valve to the pressure line having the lower pressure.

LIST OF REFERENCE NUMBERS

2

hydraulic pump

4

hydraulic motor

6

first pressure line

8th

second pressure line

10

rinsing unit

12

tank

14

supply unit

16

hydraulic accumulator

18

spool valve

20

drive shaft

22

feed pump

24

tank line

26

Pressure fluid filter

28

supply line

30

connecting line

32

connecting line

34

check valve

36

check valve

38

Pressure relief valve

40

Pressure relief valve

42

Pressure relief valve

44

flush valve

46

first flushing line

48

second purge line

50

intermediate line

52

Pressure sequence

54

control line

56

control line

58

tank line

60

control line

62

cover

63

valve housing

64

branch line

66

branch line

68

storage line

70

control line

72

control line

76

valve bore

78

valve slide

80

face

82

first pressure chamber

84

face

86

second pressure chamber

88

working channel

90

working channel

92

memory channel

94

radial collar

96

radial collar

98

valve chamber

100

end

102

end

104

stop ring

106

stop ring

108

closure element

110

closure element

112

valve spring

114

valve spring

116

ring surface

118

ring surface

120

Annular face

122

Annular face

124

Pressure relief valve

126

housing block

128

connecting channel

130

storage line

132

tank channel

134

control channel

136

rinsing unit

138

housing block

139

leakage line

140

storage line

142

memory channel

144

throttle

150

housing block

152

motor housing

154

drive shaft

156

drive Windscreen

158

roller bearing

162

piston

163

cylinder drum

164

control disc

165

swivel device

166

case side

167

pressure channel

168

pressure channel

170

screw

A

working port

B

working port

MA

working port

MB

working port

MT, T

tank connection

MS

memory connector

S

memory connector

0

center position

a, b

switch position

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

• DE 10259315 B3 [0002]
• DE 102005051324 A1 [0039]

Claims (8)

Hydraulic arrangement with a closed hydraulic circuit in which a hydraulic motor ( 4 ) and a hydraulic pump ( 2 ) and via two pressure lines ( 6 . 8th ), wherein a feed unit ( 14 ) is provided with the pressure medium from a tank ( 12 ) into the respective lower pressure line ( 6 . 8th ), and wherein a rinsing unit ( 10 . 136 ) is provided, with a pressure medium connection between the pressure-lower pressure line ( 6 . 8th ) and the tank ( 12 ) aufsteuerbar, characterized in that a hydraulic accumulator ( 16 ) via a slide valve ( 18 ) with the pressure-lower pressure line ( 6 . 8th ) is connectable. Hydraulic arrangement according to claim 1, wherein the slide valve ( 18 ) is a purge valve. Hydraulic arrangement according to claim 1 or 2, wherein the slide valve ( 18 ) is used as a charge and feed valve. Hydraulic arrangement according to claim 1 to 3, wherein in the pressure medium flow path between the slide valve ( 18 ) and the tank ( 12 ) a pressure relief valve ( 124 ) for securing the hydraulic accumulator ( 16 ) is arranged. Hydraulic arrangement according to claim 2 or 3, wherein a flushing valve ( 44 ) of the rinsing unit ( 136 ) for connecting the pressure lower pressure line ( 6 . 8th ) with the tank ( 12 ) additionally as a charge and feed valve ( 44 ) for the hydraulic accumulator ( 16 ) is used. Hydraulic arrangement according to claim 5, wherein downstream of the flushing valve ( 44 ) a pressure switch valve ( 52 ) with an upstream diaphragm ( 62 ) is arranged, the valve slide in an opening direction of the pressure in the pressure medium flow path between purge valve ( 44 ) and aperture ( 62 ) and in the closing direction is acted upon by a spring force, wherein the hydraulic accumulator ( 16 ) is connected to this pressure fluid flow path. Hydraulic arrangement according to one of the preceding claims, wherein the slide valve ( 18 . 44 ) in a valve housing ( 63 . 126 . 150 ) arranged on a motor housing ( 152 ) of the hydraulic motor ( 4 ) sits. Hydraulic arrangement according to one of the claims 1 to 6, wherein the flushing unit ( 10 ) with the flushing valve ( 44 ) in a housing block ( 138 ) on the motor housing ( 152 ) of the hydraulic motor ( 4 ) and a connection ( 142 ) for the hydraulic accumulator ( 16 ) having.

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