DE102022201909A1 - Vibration damper with a connection to a hydraulic system - Google Patents

Abstract

Vibration damper, comprising a cylinder in which a piston on a piston rod separates a working chamber on the piston rod side from a working chamber remote from the piston rod, both working chambers being connected via fluid lines within a line block connected to the cylinder to a hydraulic system which can be connected to at least one connection opening of the line block, the line block has at least one arbitrarily actuatable shut-off valve for a volume flow through the connection opening, a valve body of the shut-off valve being guided in a receiving space of the line block that is open at the end to the outside environment of the vibration damper, characterized in that a stop determines a maximum passage position of the valve body within the receiving space, wherein the stop is designed axially outside of the receiving space on the line block.

Description

The invention relates to a vibration damper according to the preamble of patent claim 1.

From the DE 10 2019 206 455 A1 a vibration damper is known which, in order to optimize the spatial arrangement, has a line block at the end, which comprises a line system for connecting a working chamber on the piston rod side and a working chamber remote from the piston rod, each with an adjustable damping valve device.

This type of vibration damper can also be connected to a hydraulic system if you use the line block according to the version shown in 7 provides.

The execution after the 7 the DE 10 2019 206 455 A1 especially when the vibration damper and the hydraulic system are installed separately and only connected to one another in the vehicle. During vehicle assembly, the vibration damper cannot be filled within the usual time cycle. The expenditure on equipment would be much too high.

In the older DE 10 2021 212 966 A1 a line block has at least one manually operable check valve to control the connection between the shock absorber and the hydraulic system. The check valve comprises a valve body which is held in a receiving space by means of a thread. A mechanical stop in the form of a locking ring is arranged inside the receiving space to support a maximum passage position. One problem is that it is very difficult to remove the locking ring from the receiving space, if necessary, in order to disassemble the valve body of the check valve. There is a risk that the wall of the receiving space will be damaged.

The line block is preferably made of aluminum, which is significantly softer than a steel solution. This increases the risk of damage even more.

In the case of an aluminum manifold block, the valve seating surfaces of the check valve can also be affected if the tightening torque for the closed position is exceeded.

In principle, there is an extreme amount of space in the installation space of the line block, which makes it difficult to actuate the shut-off valve.

The object of the present invention is to minimize the problems known from the prior art.

The object is achieved in that the stop is designed axially outside of the receiving space on the line block. By dispensing with the retaining ring previously provided, the dismantling of the valve body from the shut-off valve can be carried out much more simply and safely. Furthermore, the comparatively complex work step of screwing in the groove for the retaining ring is no longer necessary.

The stop is preferably formed by a stop plate fixed on an outer end face of the line block. The stop plate can be formed by a simple sheet metal body.

With regard to a simple overall assembly, the stop controls at least two check valves.

A simple option for attaching the stop to the line block is that the stop is fixed to the line block by means of a screw connection.

In order to keep the screwing effort low overall, the screwing connects the stop and a connection block for at least one connection line to a hydraulic system with the line block. Another advantage is that components that are fastened on both sides of the line block only need to be accessed in one direction to actuate the screw connection, so that the narrow installation space is taken into account.

As an alternative to screwing, the line block can have a clamping edge on which the stop is supported.

The external stop offers the possibility that a seal to the receiving space is functionally arranged between the line block and the stop. As a result, no dirt can get into the receiving space inside the check valve for the valve body.

For the partial problem of wear on the valve seat surfaces, it is provided that the check valve has an elastic valve seat ring which is connected to the line block or the valve body. The valve seat ring can be attached to the valve seat surface on the housing side, ie in the line block, but also to the valve body.

Alternatively, the valve body can have an elastomer body insert which, in comparison to a rigid valve body, compensates for signs of settling caused by aging within the shut-off valve.

With regard to greater freedom of choice when selecting the material for the elastomer body insert, it can be prestressed by a prestressing spring in the closing direction of the check valve.

The influence of the prestressing spring can be influenced in particular by the fact that the elastomer body insert is mounted on the valve body with axial play.

A further measure for simplified actuation of the shut-off valve even in very cramped space conditions consists in the valve body comprising a rotationally operable, axially stationary drive head and a closing head connected to the drive head in a torque-transmitting and axially movable manner. The actuating tool for the drive head thus always remains in the same pivoting plane.

The invention is to be explained in more detail on the basis of the description of the figures.

• 1u. 2 Längsschnitt durch einen erfindungsgemäßen Schwingungsdämpfer
• 3, 4, 7 u. 8 Varianten des Anschlags für die Sperrventile
• 5 u. 6 Varianten für Ventileinsätze beim Sperrventil
• 9 Sperrventil mit mehrteiligem Ventilkörper

It shows:

• 1u . 2 Longitudinal section through a vibration damper according to the invention
• 3 , 4 , 7 & . 8 stop valve variants
• 5 & . 6 variants for valve inserts for the shut-off valve
• 9 Check valve with multi-part valve body

The 1 and 2 show a longitudinal section through a vibration damper 1 with a cylinder 3 in which an axially movable piston rod 5 with a piston 7 is guided. The piston 7 is damping valves 9; 11 can be flowed through on both sides and divides the cylinder 3 into a working chamber 13 on the piston rod side and a working chamber 13 remote from the piston rod; 15. Both work spaces are completely filled with a hydraulic damping medium.

The working chamber 13 on the piston rod side is closed at the end by a piston rod guide 17 . At the other end of the cylinder 3 in series with the cylinder 3 is a pipe block 19 and between the cylinder 3 and the pipe block 19 a funnel-shaped reducer 21 is arranged. The reducer 21 represents a ring bottom with a first fluid connection 23 to an adjustable damping valve device 25 for the working chamber 15 remote from the piston rod. In principle, the reducer could also be an integral part of the wall of the cylinder 3 , ie it could be designed in one piece or welded to the cylinder 3 .

The working chamber 13 on the piston rod side is connected to a second damping valve device 29 via a second fluid connection 27 . The second fluid connection 27 is connected to the working chamber 13 on the piston rod side via a connection opening 31 within the piston rod guide 17 or in an area of the cylinder 3 which is not traversed by the piston 7 .

The cylinder 3 is encased by an intermediate tube 33 which is positioned radially on the cylinder 3 with a connection area 35 . An annular space between the intermediate tube 33 and an outer lateral surface of the cylinder 3 forms the longest section of the second fluid connection 29.

With its other end, the intermediate tube 33 is centered and held by a socket 37 of the line block 19 ( 2 ).

The cylinder 3 and the intermediate tube 33 are in turn encased by an outer container tube 41 . The container tube 41 extends at least from an outer end face 43 of the piston rod guide 17 to a centering shoulder 45 of the line block 19. Consequently, the line block 19 forms an end closure for the entire vibration damper 1.

An annular space between the intermediate tube 33 and an inner wall of the container tube 41 forms a compensating space 47 which is only partially filled with damping medium and which is filled by the piston rod 5 from the working spaces 13; 15 of the cylinder 3 compensates for the volume of damping medium displaced. Both adjustable damping valve devices 25; 29 are connected to the common compensation chamber 47 in the outflow direction.

The second fluid connection 27 is also connected to the line block 19 and both fluid connections 25; 29 have a separate radial channel 49 within the line block 19; 51, each connected to an input opening, not shown, of the damping valve devices 25; 29 is connected. With regard to the structure and function of the two damping valve devices 25; 29, which are structurally identical, is an example of the DE 10 2013 218 658 A1 referred.

A longitudinal section 57 of the second fluid connection 27 runs within the line block 19. The reducer 21 separates an annular space 59 within the second fluid connection 27 in the region of an end face 61 of the line block 19 from the working space 15 remote from the piston rod. This annular space 59 forms a radial transition within the second fluid connection 27 in the area of the outer lateral surface of the cylinder 3 and the axial longitudinal section 57 of the second fluid connection 27 within the line block 19. The radial channel 51 for the damping valve device 29 of the piston rod-side working chamber 13 is connected to this axial longitudinal section 57.

A longitudinal section 63 of the first fluid connection 23 ( 2 ). This longitudinal section 63 accommodates the reducer 21 and has the radial channel 49 in connection with a connecting piece 65 to the damping valve device 25 for the working chamber 15 remote from the piston rod. The two radial channels 49; 51 have an axial overlap, with the two damping valve device 25; 29 even have an identical axial distance to an end face 67 of the line block 19 in this specific exemplary embodiment. Due to the annular space 59, the longitudinal section 57 can be moved radially inwards in relation to the longitudinal section 63, which also increases the distance between the connecting pieces 65; 69 for the two damping valve devices 25; 29 can be minimized.

The line block 19 has a peripheral annular web 53 as part of the centering attachment. This annular web 53 is in axial overlap with the container tube 41. An outer housing 55 of the damping valve devices 25; 29 is pressure-tightly connected to the line block 19 in the area of the annular web 53 by means of a weld seam 71 . Furthermore, all axial channels 63; 57 in an end face of the line block 19 pointing in the direction of the working chambers and the compensating chamber. 51 executed.

Consequently, a receiving space 73 intersects; 75 for the two damping valve devices 25; 29 the end area of the compensating chamber 47. This creates transfer channels between the compensating chamber 47 and the damping valve devices 25; 29

On the line block 19, a hydraulic system 77 is connected by means of a pump, not shown, the damping medium in the two working chambers 13; 15 pumps. For this purpose, the line block 19 has a first and a second connection opening 79; 81, to which a connection line 85; 87 of the hydraulic system 79 are coupled. The connection block 83 is mechanically connected to the line block 19 via at least one fastening means 89 . ( 3 , 6 )

Furthermore, the line block 19 has at least one arbitrarily operable check valve 91; 93 for a volume flow through the connection openings 79; 81 on. How to get out of the particular 1 can recognize the at least one check valve and the at least one adjustable damping valve device 25; 29 arranged axially at different levels. Preference is given to the two check valves 91; 93 axially between the two damping valve devices 25; 29 and a connection element 95 fixed to the line block 19.

The hydraulic system 77 is preferably designed in such a way that a working space 13; 15 with one of the connection openings 79; 81 is connected. The connection openings 79; 81 can be flowed through in both directions during operation of the vibration damper, since, depending on requirements, a working space must be filled with damping medium or damping medium must be removed from this working space, e.g. B. in an unillustrated memory of the hydraulic system.

One check valve 91 each; 93 and the adjustable damping valve device 25; 29 are connected to the common fluid channel. The connection openings 79; 81 for the hydraulic system 77 and the check valves 91; 93 have a common angular orientation within the vibration damper 1, so that these components are arranged opposite each other on the line block 19. Furthermore, the longitudinal axes of the at least one check valve and the at least one adjustable damping valve device 25 intersect; 27

As in particular from the 8th can be seen, the check valve 91; 93, a connection space 97; 99, which is connected, for example, to the fluid line 63 in the line block 19 and to the connection opening 79, the connection space 97; 99, a valve seat surface 101 for a valve body 103; 105 of the check valve. A paragraph of the port opening 79; 81 forms the valve seat surface 101 for the valve body 103; 105. Even a slight axial adjustment of the valve body 103; 105 leads to a large transfer cross-section at the check valve 91; 93. The check valve 91; 93 is within the connection space 97; 99 aligned horizontally to the longitudinal axis of the vibration damper 1.

The valve body 103; 105 has a groove for a sealing ring 107 on its outer lateral surface, which seals the connection space 97 from the atmosphere.

During assembly of the vibration damper 1, the line block 19 is welded to the outer container tube 41 in accordance with a conventional base. The two check valves 91; 93 are in the locked position, i.e. the vibration damper 1 is hermetically sealed on the line block 19. In the further assembly process, the vibration damper is filled with damping medium and, if necessary, a volume of gas.

In a further assembly section, the check valves 91; 93 closed vibration damper 1 connected to the hydraulic system 77. To do this, the connection block is screwed onto the line block 19. This assembly step can be carried out at any assembly location. Only when the check valves 91; 93 are open, there is also a hydraulic connection between the vibration damper 1 and the hydraulic system 77.

The 3 until 9 show the line block 19 in the sectional plane through one of the check valves 91; 93. In the 3 the valve body 103 of the check valve 91 is in a receiving space 109 open at the end to the outside of the vibration damper 1; 111 of the line block 19 is guided. The recording room 109; 111 has an internal thread 112; 114 in that the valve body 103; 105 is guided and held axially. The threaded connection is permanently under the operating pressure within the connected connection space. A stop 113 determines a maximum passage position of the valve body 103; 105 within the accommodation space 109; 111 by a connection space 97; 99 opposite end face of the valve body 103; 105 rests against the stop 113.

The stop 113 is as a stop plate 115 axially outside of the receiving space 109; 111 performed on the line block 19 on a planar outer end face 117 of the line block. The stop 113 or the stop plate 115 is fixed to the line block 19 as a fastening means 89 by means of the screw connection. The screw connection 89 connects the stop 113 and the connection block 83 for the at least one connection line 85; 87 of the hydraulic system 77 with the line block 19. The connection block 83 and the stop 113 are arranged on both sides of the line block 19, so that within the line block 19 there is only a passage opening for the screw connection 89. The screw head of the fitting 89 and the check valve 91; 93 are accessible on a common side of the line block 19.

A seal 119 to the receiving space 109 is functional between the line block 19 and the stop 113; 111 arranged so that when the check valve 91; 93, the permanent position of the check valve 91; 93 corresponds to the system of the valve body 103; 105 at the stop 113 a seal of the receiving space 109; 111 is reached. A through hole 121; 123 in stop 113 for access to valve body 103; 105 does not therefore have a detrimental effect on contamination of the accommodating space 109; 111 out.

With the 4 is to show that the screw 89 does not necessarily have to be formed by a through screw. In this configuration of the connection of the stop 113 to the line block 19, the connection block 83 and the stop 113 have separate fastening means 89. This makes it possible for the length section 63 of the connection to the damping valve device 25 to be designed to be axially deeper.

The 5 shows an embodiment of the invention in which the stop 113 blocks both check valves 91; 93 controls by moving over the two receiving spaces 109; 111 extends. The screw connection 89 is arranged between the two check valves.

Furthermore, the 5 a check valve 91, in which the valve body 103 has an elastomer body insert 127 which rests on the valve seat surface 101 of the check valve 91 in the blocking position. In the valve body 103, starting from an end face pointing towards the valve seat surface 101, there is a blind opening 129, in which the elastomer body insert 127 is guided radially. The elastomer body insert 127 is mounted on the valve body 103 with axial play. If necessary, a locking ring 131 can close a connection with a wall of the valve body 103, the grooves required for this in the components involved permitting an axial displacement of the elastomer body insert 127 relative to the valve body 103 within limits. This axial play between the elastomeric body insert 127 and the valve body 103 serves as a prestressing spring 133, via which the elastomeric body insert 127 is prestressed in the closing direction of the check valve 91. This is intended to compensate for aging-related settling phenomena within the check valve 91, in particular by very large prestresses within the thread 112; 114 between the valve body 103; 105 and the line block 19 to be able to avoid.

A similarly acting form of the elastomer insert within the check valve is in 6 shown. The elastomer insert can also be designed as an elastic valve seat ring 135, which also forms the valve seat surface but is fastened in the connection space 97, for example via a support ring. Alternatively or in addition, the elastomer insert can also be fixed as a ring element on the end face in the area of the end face of the valve body 93 .

In the 7 the stop 113 is fixed to the line block 19 without a screw connection. Alternatively, the line block 19 for fixing the stop plate 115 has a clamping edge on which the stop plate 115 is supported. The clamping edge has at least two parallel receiving grooves 139; 141 for edge areas of the stop plate 115. If required, the stop plate 115 can have a small amount of shielding so that the stop plate 115 does not become detached from the line block 19 during operation of the vibration damper 1.

Another form of attachment of the stop 113 is simplified in the 8th shown. The attachment of the entire vibration damper 1 to a load-bearing component or component to be supported is also utilized for the stop plate 115 . In this case, the screw connection of an axle part 145 in the area of the connection organ of the vibration damper serves as a fastening point for the stop 113.

The execution of the stop 113 and the valve body 103 after 9 is particularly advantageous when only an extremely limited space is available for the assembly and disassembly of the valve body 103 . The difference to those in the 1 until 8th blocking valves 91 shown; 93 is that the valve body 103 comprises a rotationally operable, axially stationary drive head 147 and a closing head 149 which is connected to the drive head 147 in a torque-transmitting and axially movable manner. The closing head 149 is in the thread 112 according to the 1 until 8th out and has in the direction of the stop 113 via a plunger 151 which engages in a blind hole 153 of the drive head 147. The plunger 151 has a polygonal profile 155 which engages in a corresponding counter-profile 157 in the drive head 147 and thus produces a torque-transmitting function. The length of the ram is dimensioned such that there is always a torque-transmitting engagement of the closing head 149 in the drive head 147, regardless of the operating position of the check valve 91. The axial fixation of the drive head 147 in connection with the profile connection 155; 157 and the threaded connection 112 between the closing head 149 and the line block 19 ensures that a rotational movement of the drive head 147 is converted into an axial working movement of the closing head 149. The great advantage is that the drive head 147 does not perform any axial movement.

Reference List

1

vibration damper

3

cylinder

5

piston rod

7

Pistons

9

damping valve

11

damping valve

13

working space on the piston rod side

15

working space away from the piston rod

17

piston rod guide

19

line block

21

reducer

23

first fluid connection

25

adjustable damping valve device

27

second fluid connection

29

second adjustable damping valve means

31

port opening

33

intermediate tube

35

connection area

37

Support

39

connection area

41

tank tube

43

outer face

45

centering approach

47

balancing room

49

radial canal

51

radial canal

53

ring bar

55

Housing of the damping valve device

57

length section

59

annulus

61

face

63

length section

65

connecting piece

67

face

69

connecting piece

71

Weld

73

recording room

75

recording room

77

hydraulic system

79

first connection opening

81

second connection opening

83

terminal block

85

connecting cable

87

connecting cable

89

fasteners

91

check valve

93

check valve

95

connecting organ

97

connection room

99

connection room

101

valve seat surface

103

valve body

105

valve body

107

sealing ring

109

recording room

111

recording room

112

inner thread

113

attack

114

inner thread

115

stop plate

117

face of the line block

119

poetry

121

passage opening

123

passage opening

125

fasteners

127

elastomeric body insert

129

blind hole opening

131

locking ring

133

bias spring

135

valve seat ring

137

clamping edge

139

receiving groove

141

receiving groove

143

screw connection

145

axle part

147

power head

149

locking head

151

pestle

153

blind hole opening

155

polygonal profile

157

counter profile

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 102019206455 A1 [0002, 0004]
• DE 102021212966 A1 [0005]
• DE 102013218658 A1 [0031]

Claims (12)

Vibration damper (1) comprising a cylinder (3) in which a piston (7) on a piston rod (5) separates a working chamber (13) on the piston rod side from a working chamber (15) remote from the piston rod, both working chambers (13; 15) via fluid lines (23; 29) within a line block (19) connected to the cylinder (3) with a hydraulic system (79) that can be connected to at least one connection opening (79; 81) of the line block (19), the line block (19) having at least one arbitrarily actuatable shut-off valve (91; 93) for a volume flow through the connection opening (79; 81), wherein a valve body (101; 103) of the shut-off valve (91; 93) is located in a receiving space (109) of the Line blocks (19), characterized in that a stop (113) determines a maximum passage position of the valve body (101; 103) within the receiving space (109), the stop (113) being located axially outside the receiving space (109) on the line block ( 19) is executed. vibration damper claim 1 , characterized in that the stop (113) is formed by a stop plate (113) fixed on an outer face (117) of the line block (19). Vibration damper according to claims 1 or 2 , characterized in that the stop (113) controls at least two check valves (91; 93). Vibration damper according to at least one of Claims 1 - 3 , characterized in that the stop (113) is fixed to the line block (19) by means of a screw connection (89). vibration damper claim 4 , characterized in that the screw connection (89) connects the stop (113) and a connection block (83) for at least one connection line (85; 87) to the hydraulic system (79) with the line block (19). Vibration damper according to at least one of Claims 1 - 3 , characterized in that the line block (19) has a clamping edge (137) on which the stop (113) is supported. Vibration damper according to at least one of Claims 1 - 6 , characterized in that functionally between the line block (19) and the stop (113) a seal (119) to the receiving space (109) is arranged. Vibration damper according to at least one of Claims 1 - 7 , characterized in that the check valve (91; 93) has an elastic valve seat ring (135) which is connected to the line block (19) or the valve body (101; 103). Vibration damper according to at least one of Claims 1 - 7 , characterized in that the valve body (101; 103) has an elastomer body insert (127). vibration damper claim 9 , characterized in that the elastomer body insert (127) by a biasing spring (133) in the closing direction of the check valve (91; 93) is biased. Vibration damper according to at least one of claims 9 or 10 , characterized in that the elastomer body insert (127) is mounted with axial play on the valve body (101; 103). Vibration damper according to at least one of Claims 1 - 11 , characterized in that the valve body (101; 103) comprises a rotationally operable, axially stationary drive head (147) and a closing head (149) connected to the drive head (147) in a torque-transmitting and axially movable manner.

Images