WO2017182198A1

WO2017182198A1 - Adjustable vibration damper

Info

Publication number: WO2017182198A1
Application number: PCT/EP2017/055990
Authority: WO
Inventors: Andreas Förster
Original assignee: Zf Friedrichshafen Ag
Priority date: 2016-04-19
Filing date: 2017-03-14
Publication date: 2017-10-26
Also published as: DE102016206595A1

Abstract

The invention relates to an adjustable vibration damper (1), comprising at least one adjustable damping valve (33, 35) for every working movement direction of the vibration damper (1), wherein each damping valve (33, 35) is connected by means of a high-pressure connection (67, 69) to a working chamber (37, 39) and by means of a low-pressure connection (107, 109) to a storage device (49), wherein the two adjustable damping valves (33, 35) are arranged in a common housing (31) which has a connection chamber (59), wherein the connection chamber (59) has a communicating opening (53, 55) to each working chamber (37, 39) and, separately therefrom, a connection (57) to the storage device (49).

Description

Adjustable Schwinqunqsdämpfer

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

From DE197 03 872 A1 a concept for an adjustable vibration damper is known in which two adjustable damping valves are connected at their downstream or low pressure side to a common memory for the displaced by a piston rod damping medium volume. In DE197 03 872 A1 only a substitute chart for the concept is shown, but no constructive implementation.

DE 10 2012 202 100 A1 also relates to an adjustable vibration damper, each having a damping valve for each one working direction of the vibration damper. In this case, a flow distributor is used which has two receptacles for the adjustable Dämpfventileinrichtungen. Each of the adjustable damping valves is assigned a separate memory on the low pressure side. This design is significantly more complicated than the concept according to DE 197 023 872 A1.

From DE 10 2005 053 394 A1, an embodiment is known in which the concept of the arrangement of the adjustable damping valves to a common memory according to DE 197 03 872 A1 was realized constructively. In this design, there is the problem of complex flow control and the double connection of an external housing to a cylinder.

The object of the present invention is to provide a simple construction for a variable by means of two damping valves vibration in conjunction with a common low-pressure side memory.

The object is achieved in that the two adjustable damping valves are arranged in a common housing, which has a connection space, wherein the connection space has a connection opening to a respective working space and separated from it has a connection to the memory. Advantageously, the combination of the adjustable damping valves in conjunction with the connection space achieves a compact structural unit which can be connected comparatively easily to a vibration damper. There are no external lines necessary, which would have to be elaborately guided or protected.

In a further advantageous embodiment, the separation of the terminals of the working spaces and the memory via a channel element, wherein the channel element has a first channel group to the high pressure port and a second channel group to the low pressure port of the adjustable damping valves. By a simple series arrangement of the two adjustable damping valves and the channel element located therebetween very simple basic components are possible.

According to a subclaim, the channel element is divided into two, so that there is a separate channel element for each direction of movement of the vibration damper. By an axial division of the channel elements they are very simple in their structural design and can also be easily manufactured.

It is envisaged that each channel element is equipped with a check valve which opens in the inflow from the memory to the working space. Thus, the combination of a channel element with a check valve easier to implement, as if a one-piece channel element would be provided.

The low-pressure connection of the channel group is preferably connected to a storage connection space. The storage connection space has a disc-shaped basic shape and is determined by the distance between the two channel elements.

This is z. B. the rotational orientation of the channel element within the housing unimportant. Similarly, angled flow paths are avoided.

Advantageously, the channel element together with the housing forms a sealing point which separates a pressure connection space as part of the connection space from the storage connection space. A separate seal, z. As an O-ring, can be omitted. It is envisaged that the channel element is held axially by a valve housing. As a result, a series arrangement is achieved that allows individual assemblies that can be manufactured and checked individually.

With regard to simple components, the channel element has a ring shape and carries the associated non-return valve. The channel element and the associated non-return valve form a structural unit in which the non-return valve is fixed independently of the housing.

In this sense, the check valve covers a passage opening of the channel element.

As a further measure of a compact overall design, a valve disk assembly of the check valve extends into the passage opening.

According to an advantageous embodiment, the high-pressure connection of the adjustable damping valve has a connecting piece, on which the channel element is radially supported. The spigot offers the possibility of a simple O-ring arrangement between the channel element and the adjustable damping valve.

It is preferably provided that one of the channel groups is formed by a number of axial channels. The axial channels can be produced very easily.

Furthermore, one of the channel groups is formed by at least one radial channel. Due to the strictly separated alignment of the channel groups can on additional flow control elements, such. B. check valves are dispensed with.

In a further constructional embodiment, the at least one radial channel, bypassing the at least one axial channel, connects an outer circumferential surface of the channel element to the through-opening.

The invention will be explained in more detail with reference to the following description of the figures. It shows:

Fig. 1 sectional view of the adjustable vibration damper

Fig. 2 detail to Fig. 1

Fig. 3 u. 4 housing with adjustable damping valves

Fig. 1 shows an adjustable vibration damper 1 with a cylinder 3, in which a piston rod 5 together with a piston 7 attached thereto performs an axial working movement. The piston 7 may be equipped with a damping valve and / or a pressure relief valve for each direction of movement.

The cylinder 3 is completely enveloped by a container tube 9. End side, the container tube 9 has a bottom 11 which supports a centering ring 13 for the cylinder 3. The centering ring 13 is equipped with at least one axial flow connection 15. A piston rod guide 17 closes both the cylinder 3 and the container tube 9 at the other end.

In this embodiment, the container tube 9 is executed axially divided into two and takes between the two facing each other a terminal block 19. The connection block 19 has two separate channels 21; 23 to a pumping device 25 and two channels 27; 29 to a housing 31 with adjustable damping valves 33; 35 (see Figure 2).

The container tube 9 and the cylinder 3 form an annular space. Both a piston-rod-side working chamber 37, a piston rod-distant working chamber 39 and the annular space are completely filled with a damping medium. The piston rod-side working space 37 is connected via at least one radial opening 41 in the cylinder 3 to a first annular space portion 43, which in turn is connected to the first channel 27 in the connection block 19 to the housing 31. The same construction principle is used for the piston rod remote working space 39, which is connected via the axial flow connection 15 in the centering ring 13 and a second annular space portion 45 to the second channel 29 in the connection block 19. Both annular space sections 43; 45 are separated by a sealing separation flange 47 of the terminal block. Directly on the housing 31 with the adjustable damping valves 33; 35, a memory 49 is fixed, which compensates the displaced by the piston rod 5 Dämpfmediumvolumen.

The two figures 3 and 4 show the entire housing 31 in two sectional planes. The housing 31 has a connection sleeve 51 with two radial connection openings 53; 55 to the work spaces and a port 57 to the memory 49. A first radial communication opening 53 is in register with the first channel 27 and a second radial communication port 55 is coupled to the second channel 29 in the terminal block 19. The connection openings 53; 55 and the terminal 57 open into a connection space 59 of the housing 31. Based on a support flange 61, the housing 31 is symmetrical and has a receptacle 63; 65 for the adjustable damping valves 33; 35 for each direction of movement of the vibration damper. Each adjustable damping valve 33; 35 has a high pressure port 67; 69 with an optional inlet valve 71; 73 and a main stage valve 75; 77, that of a precursor valve 79; 81 is controlled. The basic principle of this valve combination is known, for example, from DE 10 2013 209 926 A1, so that reference is made to this document with regard to design details.

Within the connection space 59 is a two-part channel element 83; Arranged 85, which is supported on the support flange 61. At this point both single channel elements 83; 85 with the housing 31 on the support flange 61, a sealing point 87; 89, wherein the single channel elements 83; 85 each of a valve housing 91; 93 are held axially. The valve housing 91; 93 are in turn of fixing caps 95; 97 against the single channel elements 83; 85 biased.

Each of the single channel elements 83; 85 has a first channel group 99; 101 to the high pressure port 67; 69. A second channel group 103; 105 is formed by axial channels and is connected to a low pressure port 107; 109 of the respective adjustable damping valve 33; 35 connected. The first channel group is designed in the design of at least one radial channel. The at least one radial nal 99; 101 connects an outer circumferential surface 111; 113 of the single-channel element 83; 85 with a through hole 115; 117 of the single-channel element, which has a ring shape and is arranged spatially so that the axial channels 103; 105 be bypassed. The lateral surfaces 111; 113 have an at least slightly smaller outer diameter than the connection space 59, so that in the region of the lateral surfaces in each case an annular space 119; 121 is present and thus also a plurality of radial channels to a single connection opening 53; 55 is connectable without a defined orientation of the single channel elements would be necessary to the connection openings.

Via the passage opening 115; 117 there is a centering connection with a connecting piece 123; 125 of the high pressure port 67; 69 of the adjustable damping valve 33; 35. The centering connection is also sealed by means of an inserted in a groove ring seal.

Each single channel element 83; 85 is connected to a check valve 127; 129 equipped in the Nachströmrichtung from the memory 49 to the working space 37; 39 opens. For example, a protruding edge portion of the single-channel member is caulked with a check valve body 131, 133. The check valve 131, 133 covers the through-hole 115, 117 of the single-channel member 83, 85 toward a storage port space A valve disc assembly 137, 139 with at least one valve disc and a closing spring extends within the passage opening of the single-channel element.

During an extension movement of the piston rod 5 out of the cylinder 3, the damping medium from the piston rod-side working chamber 37 is conveyed via the radial opening 41 below the piston rod guide 17 into the first annular space section 43. At the separating flange 47, the damping medium enters the first connection opening 53 via the first channel 27 and reaches the annular space 119 as part of the connection space 59. Via the at least one radial channel 99, the damping medium reaches the high-pressure connection 67 of the adjustable damping valve 33 and the inlet valve in the further flow path 71. The check valve 127 is closed. Depending on the energization of a solenoid 141 as part of the adjustable damping valve 33, the pre-stage valve 79 determines a closing force that opposes the pending on the main-stage valve opening force. The damping medium flowing out of the main stage valve to the low-pressure connection 107 is supplied to the storage connection space 135 via the axial channels 103 in the channel element 83.

In this Arbeitsbewegungsrichtung the piston rod 5 is displaced from the piston rod side working space 37 Dämpfmediumvolumen smaller than the increase in volume of the piston rod remote working space 39. Consequently, the entire displaced from the piston rod side working chamber 37 damping medium via the opening check valve 133 into the through hole 1 17 of the second Single-channel element 85 displaced and further supplied via the radial channels 101 and the second connection opening 55 to the second channel 29. Via the second annular channel section 45, the damping medium flows further into the piston rod remote working chamber 39 and passes through the flow connection 15 in the centering ring 13. The volume fraction corresponding to the extending piston rod 5 is supplemented by the memory 49 and takes starting from the storage connection space 135 the same flow path as that from the piston rod side Arbeitsraum displaced damping medium, since the second channel groups 103; 105 are connected to the storage connection space.

During a retraction movement of the piston rod 5 and an associated volume reduction of the piston rod remote working space 39, the damping medium via the flow connection 15 and the second annular channel portion 45 to the second channel 29 in the terminal block 19 is supplied. Via the second channel 29, the damping medium flows through the radial channels 101 into the through-opening 17 of the second single-channel element 85. The flow path and the mode of operation of the second adjustable damping valve 35 correspond exactly to the description of the first adjustable damping valve 33 Main stage valve has reached the low pressure port 109 of the adjustable damping valve 35, then the other flow path via the axial channels 105 in the storage compartment 135. A portion of the damping medium is opened via the open check valve 127 in the first single-channel element 83 and further by the minimum at least one radial passage 99 of the first communication port 53 to the first channel 27 is supplied to keep the piston rod-side working space 37 filled without negative pressure. The excess damping medium volume corresponding to the displaced piston rod volume flows via the port 57 into the reservoir 49.

Parallel to the described damping medium flow can 25 via the pumping means damping medium between the two working chambers 37; 39 regardless of the direction of movement of the piston rod 5 are pumped. Stand for the damping medium with the two annular space portions 43; 45, the radial opening 41 and the flow connection 15 in the centering ring 13 largely identical flow paths available. Pump ports 143; 145 to the two annular space sections 43; 45 are also separated from the separation flange 47, so that the pump means 25 the housing 31 with the adjustable damping valves 33; 35 is connected in parallel hydraulically.

REFERENCE CHARACTERS

Vibration damper 59 Terminal compartment

Cylinder 61 Support flange

Piston rod 63 receptacle

Piston 65 intake

Reservoir pipe 67 High pressure connection

Bottom 69 high pressure connection

Centering ring 71 inlet valve

Flow connection 73 inlet valve

Piston rod guide 75 Main stage valve

Terminal block 77 Main stage valve

Channel 79 pre-valve

Channel 81 pre-valve

Pumping device 83 single channel element

Channel 85 single channel element

Channel 87 sealing point

Housing 89 sealing point

Adjustable damper valve 91 Valve body Adjustable damper valve 93 Valve body Piston rod side working space 95 Fixing cap Piston rod remote working space 97 Fixing cap

Radial opening 99 channel group first annulus section 101 channel group second annulus section 103 second channel group

Separation flange 105 second channel group

Storage 107 low-pressure connection

Connection sleeve 109 Low pressure connection

Connection opening 111 lateral surface

Connection opening 113 lateral surface

Connection 115 passage opening Through opening annulus

annulus

Connecting piece Connecting piece Non-return valve Non-return valve Non-return valve body Non-return valve body Storage connection space Valve equipment Valve assembly Solenoid coil

Pump connection pump connection

Claims

claims

An adjustable vibration damper (1) comprising at least one adjustable damping valve (33; 35) for each working movement direction of the vibration damper (1), each damping valve (33; 35) being connected to a working space (37; 39) via a high pressure port (67; ) and a low-pressure connection (107; 109) to a memory (49), characterized in that the two adjustable damping valves (33; 35) are arranged in a common housing (31) having a connection space (59), wherein the connection space (59) has a connection opening (53; 55) to a respective working space (37; 39) and separately therefrom a connection (57) to the reservoir (49).

2. An adjustable vibration damper according to claim 1, characterized in that the separation of the terminals of the working spaces (37; 39) and the memory (49) via a channel element (83; 85), wherein the channel element (83; 85) a first channel group (99, 101) to the high pressure port (67; 69) and a second channel group (103; 105) to the low pressure port (107; 109) of the variable damping valves (33; 35).

3. An adjustable vibration damper according to claim 2, characterized in that the channel element (83; 85) is divided into two, so that for each direction of movement of the vibration damper, a separate channel element (83; 85) is present.

4. An adjustable vibration damper according to claim 3, characterized in that each channel element (83; 85) is equipped with a check valve (127; 129) which opens in the inflow direction from the reservoir (49) to the working space (37; 39).

5. Adjustable vibration damper according to claim 2, characterized in that the low-pressure connection (107, 109) is connected via the channel group (103, 105) to a storage connection space (135).

6. An adjustable vibration damper according to claim 2, characterized in that the channel element (83; 85) together with the housing (31) forms a sealing point (87; 89) which forms the high-pressure connection space (67; 69) as part of the connection space (57). from the storage compartment (135) separates.

7. An adjustable vibration damper according to claim 2, characterized in that the channel element (83; 85) is held axially by a valve housing (91; 93).

8. An adjustable vibration damper according to claim 4, characterized in that the channel element (83; 85) has a ring shape and the check valve (127, 129) carries.

9. An adjustable vibration damper according to claim 8, characterized in that the check valve (127; 129) covers a passage opening (115; 117) of the channel element (83; 85).

10. An adjustable vibration damper according to claim 9, characterized in that a Ventilscheibenbestückung (137, 139) of the check valve (127, 129) in the passage opening (115, 117) extends.

11. An adjustable vibration damper according to claim 1, characterized in that the high-pressure port (67; 69) of the adjustable damping valve (33; 35) has a connecting piece (123; 125) on which the channel element (83; 85) is radially supported.

12. An adjustable vibration damper according to claim 2, characterized in that one of the channel groups (103, 105) is formed by a number of axial channels.

13. An adjustable vibration damper according to claim 2, characterized in that one of the channel groups (99, 101) is formed by at least one radial channel.

14. An adjustable vibration damper according to claims 12 and 13, characterized in that the at least one radial channel (99; 101) bypassing the at least one axial channel (103; 105) an outer circumferential surface (1 1 1, 1 13) of the channel element with the Through opening (1 15, 1 17) connects.