Adjustable damping valve device for shock absorber

Abstract

The invention relates to an adjustable damping valve device for a shock absorber, the damping valve device having a primary valve for controlling a primary valve, the primary valve having a flow connection to a working space on the piston rod side of the shock absorber and a flow connection to a working space remote from the piston rod, the control volume flow from the working space to the primary valve is rectified by means of a non-return valve assembly, the non-return valve assembly being designed on a multi-part main stage valve body of the main stage valve, the main stage valve body having a valve base body, the valve base body has at least one first check valve channel on an outer reference circle and at least one second check valve channel on an inner reference circle, the first check valve channel being combined with a first check valve disc for a control volume flow of a first of the two working spaces, and the second check valve channel being combined with a second check valve disc for a control volume flow of a second of the two working spaces. The second check valve channel has a second check valve disc associated with a second one of the two working spaces, and wherein a cover as a component of the main stage valve body spatially separates the check valve having the second check valve disc from the control chamber of the main stage valve body in order to function as a check valve housing on the outflow side.

Description

Technical Field

[0001] The invention relates to an adjustable damping valve arrangement for a shock absorber according to the preamble of patent claim 1 . Background Art

[0002] For example, the adjustable damping valve assembly known from DE 40 16 807 A1 comprises a primary valve and a main-stage valve. To rectify the control volume flow from the piston rod side or the working space remote from the piston rod to the primary valve, a check valve is hydraulically connected upstream of the primary valve. Numerous channels are required in the extremely confined space between the two working spaces and the primary valve. To achieve this, the main-stage valve body is constructed in two parts, with the screw-in securing two check valve discs that are axially spaced apart and open toward the primary valve.

[0003] The adjustable damping valve arrangement described in DE 44 18 972 A1 also includes a primary valve for controlling a main-stage valve. Here, the control volume flow between the working space and the primary valve is hydraulically rectified via two check valves. The difference is that the two check valves are spatially coaxially arranged relative to one another. The outer check valve has at least one check valve disk. The central check valve for the incoming flow from the working space remote from the piston rod includes a movably mounted ball as a closing element.

[0004] In this damping valve arrangement, the main-stage valve body is also designed in two parts and has a T-shaped base body with an axial channel, which in turn has a radial channel leading to the control chamber of the main-stage valve body. A connecting channel connects the working space remote from the piston rod to the axial channel via a central non-return valve and is also connected to the control chamber. The inflow channel for the non-return valve leading to the outside is formed in the annular element of the main-stage valve body. A groove in the receiving opening of the annular element at the base body connects the control chamber of the main-stage valve body to the radial channel in the T-shaped base body. A form-fit connection exists between the annular element and the base body. This design still has the weaknesses of a central non-return valve, as the closing body does not have a closing spring, but on the other hand can cover a large stroke in the axial channel. To ensure a good guiding function, the annular element must be subsequently processed in the area of ​​the guide surface in the control chamber due to the form-fit connection. Summary of the Invention

[0005] The object of the present invention is to provide a damping valve arrangement which has a simple structural design when using a plurality of check valves for rectifying the control volume flow.

[0006] This object is achieved in the following manner: the main stage valve body has an annular base body, which has at least one first check valve channel on an outer pitch circle and at least one second check valve channel on an inner pitch circle, the first check valve channel is combined with a first check valve disc for controlling the volume flow of the first of the two working spaces, and the second check valve channel has a second check valve disc associated with the second of the two working spaces, wherein a cover as a component of the main stage valve body spatially separates the check valve with the second check valve disc from the control chamber of the main stage valve body, thereby serving as a check valve housing on the outflow side.

[0007] The main advantage of the present invention is the compact arrangement of the check valve with the check valve disc. The check valve disc can utilize a large pressure-bearing surface to keep the lifting force for the check valve low.

[0008] In another advantageous design, the cover has a stepped profile on the inside, wherein the shoulder of the stepped profile forms a lift limiting surface for the second non-return valve disc. By limiting the lift stroke, a rapid non-return valve closing movement is also ensured.

[0009] According to an advantageous dependent claim, the cover has an outer side as a guide surface for the valve disk of the first nonreturn valve. The valve base body of the main stage valve body can be designed to be correspondingly simpler.

[0010] Additionally, it is provided that the cover has at least a web-shaped stop surface to limit the lifting movement of the valve disk of the first check valve. Thus, lifting limitation is produced for the two check valves.

[0011] Preferably, the valve basic body has a guide ring which radially supports the main stage valve body in the valve housing. The guide ring is preferably designed integrally with the valve basic body.

[0012] In a further advantageous embodiment, the main stage valve body comprises a bearing pin which is separate from the valve basic body and has an axial channel for connecting the control chamber to the primary valve.

[0013] According to an advantageous dependent claim, the load-bearing bolt has a first radial connection to the control chamber and a second radial connection in the check valve housing, wherein both radial connections open into the axial channel. Due to the separate radial connections and the associated possibility of different throttling functions with respect to the axial channel, the instantaneous pressure in the check valve housing can be significantly lower than the instantaneous pressure in the control chamber of the mainstage valve body. Consequently, the closing pressure acting on the second check valve disc can be lower than the pressure acting in the control chamber when the first check valve disc is open.

[0014] In addition, the bearing bolt has an axial stop for fixing the cover. The cover is axially fixed by stringing the cover and the valve base.

[0015] The valve base body preferably has a sleeve extension for the valve seat ring. The valve seat ring offers more flexibility in designing the pressure-bearing surface acting in the lifting direction on the mainstage valve. By separating the valve seat ring from the valve base body, all individual components of the mainstage valve body can be manufactured without undercuts, for example by sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in more detail with reference to the following drawings, wherein:

[0017] Figure 1 shows a section through the shock absorber in the region of the adjustable damping valve arrangement, and

[0018] Figure 2 Shown Figure 1 Detailed view of the . DETAILED DESCRIPTION

[0019] Figure 1 A cross section through an adjustable damping valve arrangement 1 for a shock absorber 3 is shown. In this exemplary embodiment, the damping valve arrangement 1 is shown located in a damping valve housing 5, which is located on an axially displaceable piston rod 7 in a working cylinder 9 of the shock absorber 1. However, the damping valve housing 5 and therefore the damping valve arrangement 1 can also be arranged spatially outside the shock absorber 1 and hydraulically connected, for example, via a line connection or a hose connection.

[0020] The damping valve arrangement 1 comprises an electromagnetic actuator 11 with a solenoid coil 13 and an armature 15 , which acts on the primary valve body 17 of a primary valve 19 at its end. At least one return spring 21 counteracts the force of the solenoid coil 13 .

[0021] The primary valve 19 serves for hydraulically actuating a main stage valve 23 , via which a piston rod-side working space 25 and a piston rod-remote working space 27 in the working cylinder 9 are connected to one another. Figure 1 The radial connecting channel 29 in the valve housing ring 31, which is a component of the damping valve housing 5, is shown. This connecting channel connects the piston rod-side working space 25 to the main stage valve 23. Passive damping valves 33 and 35 are arranged between the working space 27 remote from the piston rod and the main stage valve 23, respectively, for the flow direction through the damping valve arrangement 1. The two passive damping valves 33 and 35 are selectively operable. Regardless of the working direction of the piston rod 7 in the shock absorber 3, the damping force-determining volume flow of the damping medium in the working cylinder 9 is discharged via the connecting channel 29, the main stage valve 23, and the two passive damping valves 33 and 35. Furthermore, a separating piston 36, as a functional part of the damping valve housing 5, ensures the spatial separation of the two working spaces 25 and 27.

[0022] The main stage valve 23 includes a main stage valve body 37 and a main stage valve seat surface 39 (see Figure 2 ), the main-stage valve seat surface is formed by the valve ring 41 within the valve housing ring 31. The main-stage valve body 37 is guided axially displaceably within the stepped opening 43 of the valve housing ring 31. The main-stage valve body 37 seals against the inner side surface 43A of the stepped opening 43. The main-stage valve body 37, a portion of the side surface 43A, and the bottom 43B of the stepped opening 43 form a control chamber 45 for the main-stage valve 23. This control chamber 45 is connected to the radial connecting channel 29 via at least one first check valve channel 47. Due to the throttling function of the check valve channel 47, a pressure drop exists between the pressure in the connecting channel 29 and the pressure in the control chamber 45. The pressure in the control chamber 45 exerts pressure on the main-stage valve body 37, which acts as a closing force on the main-stage valve 23.

[0023] The main-stage valve body 37 has a valve pin 49 pointing toward the primary valve 19 and having a primary valve seat surface 51 at its end for the disk-shaped primary valve body 17. The valve pin 49 is hollow and has at least one radial connection 53 leading to an axial channel 55, in which the same pressure prevails as in the control chamber 45 and which acts as a control chamber for the primary valve 19, exerting a hydraulic lifting force on the primary valve body. It can also be provided that the connection opening 53 performs a throttling function, so that a pressure drop exists between the control chamber 45 of the main-stage valve body 37 and the axial channel.

[0024] The main stage valve body 37 is composed of multiple components and has a valve base 37G, which has at least the first check valve channel 47 on the outer pitch circle and at least one second check valve channel 59 on the inner pitch circle. The first check valve channel is combined with a first check valve disk 57 for the control volume flow from the piston rod-side working space 25, and the second check valve channel has a second check valve disk 61 associated with the second of the two working spaces 27. A cover 37D, as a component of the main stage valve body 37, spatially separates the check valve with the second check valve disk 61 from the control chamber 45 of the main stage valve body 37 and thus functions as a check valve housing 62 on the outflow side.

[0025] The cover 37D has a stepped profile on its inner side, wherein the shoulder of the stepped profile forms a lift-limiting surface 63 for the second check valve disk 61. The outer side of the cover 37D has a guide surface 65 for the first check valve disk 57. In addition, the cover 37D has at least a web-shaped stop surface 67 for limiting the lifting movement of the first check valve disk 57. As a result, the cover 37D has a geometry without undercuts and can be manufactured very easily using a sintering process, for example, if the mold parting surface is located in the region of the stop surface 67.

[0026] In addition, the valve basic body 37G has a guide ring 37F, which radially supports the main stage valve body 37 within the valve housing ring 31 .

[0027] The main-stage valve body 37 includes a bearing pin 37T, separate from the valve base 37G, which has an axial passage 55 for connecting the control chamber 45 to the primary valve 19. In addition to a first radial connection 53 connecting to the control chamber 45 of the main-stage valve body 37, the bearing pin 37T also has a second radial connection 69 that extends into the check valve housing 62. Both radial connections 53 and 69 open into the axial passage 55. Thus, the axial passage 55 can be formed as a simple blind opening whose open end is the valve seat surface 51 of the primary valve 19. The inner second pitch circle of the second check valve passage 59 is also located outside the projection surface 71 formed by the bearing pin 37T. The bearing pin 37T axially penetrates the valve base 37G with its centering section 73 for a support disk 75. The support disk 75 rests on a valve seat surface 77 for the main-stage valve body 37.

[0028] The load-bearing bolt 37T has an axial stop 79 for fixing the cover 37D, which is axially preloaded by the valve base body 37G. For this purpose, a fastening thread is used between the valve base body 37G and the load-bearing bolt 37T.

[0029] On the side of the valve base 37G facing away from the cover 37D, the valve base has a sleeve extension 37H for a valve seat ring 81. The valve seat ring 81 can optionally be used to increase the size of the pressure-bearing surface in the lifting direction away from the working space 27 of the piston rod. From a manufacturing perspective, the advantage of a separate valve seat ring 81 is that it makes it easier to manufacture the valve base 37G.

[0030] When flowing from the working space 27 remote from the piston rod to the damping valve arrangement 1 , the damping medium passes through the passive damping valve 35 and reaches the main stage valve 23 via the connecting chamber 83 .

[0031] The control volume flow flows through the second check valve channel 59 and the raised second check valve disk 61 into the check valve housing 62 and further through the second connection opening 69 into the axial channel 55, more specifically, the control chamber of the primary valve 19. The first radial connection 53 ensures the pressure supply from the axial channel 55 to the control chamber 45 for the main stage valve body 37. Here, the first check valve disk 57 closes the check valve channel 47 toward the connection opening 29. This prevents a hydraulic short circuit between the working spaces 25, 27 via the control chamber 45. The pressure in the axial channel 55 or in the control chamber of the primary valve 19 generates a hydraulic lifting force on the primary valve body 17.

[0032] When flowing from the piston rod-side working space to the damping valve arrangement 1, the damping medium enters the valve housing 5 through the connection opening 29 to the main stage valve 23 and reaches the control chamber 45 of the main stage valve body 23 via the first non-return valve channel 47 and the raised first non-return valve disk 57. Here, the control volume flow also flows via at least one radial connection 53 into the control chamber 55 of the primary valve 19.

[0033] Regardless of the direction of inflow into the primary valve 19, the damping medium discharged through the primary valve 19 reaches the rear chamber 85 of the primary valve 19 between the bottom 43B of the valve housing ring 31 and the actuator 11. This rear chamber is connected to a check valve assembly 87, which comprises a check valve ring 89 equipped with at least one check valve disk 91, 93 on both sides. These check valve disks 91, 93, combined with the check valve ring 89, form two check valves for controlling the control volume flow from the primary valve 19 into the two working chambers 25, 27 of the working cylinder 9. The damping valve housing 5 has at least one connecting opening 95, which is radial in this example, in the flow direction from the check valve assembly 87 toward the piston rod-side working chamber 25. To connect the primary valve 19 to the working chamber 27 remote from the piston rod on the outflow side, the valve housing ring 31 has a channel system 97 that opens into the connecting chamber 83. When flow is directed from one of the two working spaces 25 , 27 to the non-return valve arrangement 87 , the non-return valve in the corresponding flow direction, ie, the flow bypassing the primary valve 19 , is closed.

[0034] The non-return valve ring 89 has an annular groove 99 in the direction of the rear chamber 85, which in turn includes an axial connection opening 101 leading to the channel system 97 in the valve housing ring 31. The annular groove 99 is connected to a radially inner angled channel 103. The angled channel 103 thus connects the rear chamber 85 of the primary valve 19 to the connection opening 101.

[0035] The lifting movement of the non-return valve disk 93 for the channel system 97 in the valve housing ring 31 is limited by the valve housing ring 31. For the lifting movement of the non-return valve disk 91 on the upper side of the non-return valve ring 89, a cover ring 105 is used, which additionally fixes the non-return valve ring 89 axially in the damping valve housing 5.

[0036] Reference Signs List

[0037] 1 Adjustable damping valve device

[0038] 3 shock absorbers

[0039] 5 Damping valve housing

[0040] 7 Piston rod

[0041] 9 working cylinders

[0042] 11 Actuator

[0043] 13. Electromagnetic coil

[0044] 15 Armature

[0045] 17 Primary valve body

[0046] 19 Primary valve

[0047] 21 Return spring

[0048] 23 Main stage valve

[0049] 25 Working space on the piston rod side

[0050] 27 Working space away from piston rod

[0051] 29 Radial connecting channel

[0052] 31 Valve housing ring

[0053] 33 Passive Damping Valve

[0054] 35 Passive Damping Valve

[0055] 36 pistons

[0056] 37 Main stage valve body

[0057] 37D Main stage valve body cover

[0058] 37F Main stage valve body guide ring

[0059] 37G main stage valve body valve base

[0060] Sleeve extension for 37H main stage valve body

[0061] 37T Main Stage Valve Body Bearing Pins

[0062] 39 Main stage valve seat surface

[0063] 41 valve ring

[0064] 43 Stepped opening of valve housing ring

[0065] 43A Side of the step opening

[0066] 43B Bottom of stepped opening

[0067] 45 Control chamber of main stage valve body

[0068] 47 First throttle channel

[0069] 49 Valve pin

[0070] 51 Primary valve seat surface

[0071] 53 radial connection

[0072] 55 axial passage; control chamber of primary valve

[0073] 57 First check valve disc

[0074] 59 Second check valve channel

[0075] 61 Second check valve disc

[0076] 62 Check valve housing

[0077] 63 Lift limit surface

[0078] 65 guide surface

[0079] 67 stop surface

[0080] 69 second radial connection portion

[0081] 71 projection surface

[0082] 73 Centering section

[0083] 75 support plate

[0084] 77 Main stage valve seat surface

[0085] 79 Axial stop

[0086] 81 Seat ring

[0087] 83 Connection Room

[0088] 85 rear space

[0089] 87 Check valve assembly

[0090] 89 Check valve ring

[0091] 91 Check valve disc

[0092] 93 Check valve disc

[0093] 95 radial connection opening

[0094] 97-channel system

[0095] 99 annular groove

[0096] 101 Connection opening

[0097] 103 Corner Channel

[0098] 105 Cover ring.

Claims

1. An adjustable damping valve device (1) for a shock absorber (3), wherein: The damping valve device (1) has a primary valve (19) for controlling a main stage valve (23), wherein the primary valve (19) has a flow connection portion connected to a working space (25) on the piston rod side of the shock absorber (3) and a flow connection portion connected to a working space (27) remote from the piston rod, wherein a control volume flow from the working space (25, 27) to the primary valve (19) is rectified by a check valve assembly (47, 57, 59, 61), wherein the check valve assembly (47, 57, 59, 61) is designed at a multi-piece main stage valve body (37) of the main stage valve (23), characterized in that the main stage valve body (37) has a valve base body (37G) which There is at least one first check valve channel (47) on the outer pitch circle and at least one second check valve channel (59) on the inner pitch circle, the first check valve channel being combined with a first check valve disc (57) for controlling the volume flow of the first working space (25) of the two working spaces, the second check valve channel having a second check valve disc (61) associated with the second working space (27) of the two working spaces, wherein a cover (37D) as a component of the main stage valve body (37) spatially separates the check valve having the second check valve disc (61) from the control chamber (45) of the main stage valve body (37), thereby serving as a check valve housing (62) on the outflow side.

2. The damping valve device (1) according to claim 1, characterized in that The cover (37D) has a stepped profile on the inner side, wherein a shoulder of the stepped profile forms a lift-limiting surface (63) for the second non-return valve disc (61).

3. The damping valve device (1) according to claim 1 or 2, characterized in that The cover (37D) has an outer side as a guide surface (65) for the first non-return valve disk (57).

4. Damping valve arrangement (1) according to at least one of claims 1 to 3, characterized in that The cover (37D) has at least a web-shaped stop surface (67) for the lifting movement of the first non-return valve disk (57).

5. Damping valve arrangement (1) according to at least one of claims 1 to 4, characterized in that The valve basic body (37G) has a guide ring (37F) which radially supports the main stage valve body (37) in the valve housing (5).

6. Damping valve arrangement (1) according to at least one of claims 1 to 5, characterized in that The main stage valve body (37) includes a load pin (37T) separated from the valve base (37G), the load pin having an axial passage (55) for connecting a control chamber (45) of the main stage valve body (37) to the primary valve (19).

7. The damping valve device (1) according to claim 6, characterized in that The load-bearing bolt (37T) has a first radial connection (53) connected to the control chamber (45) and a second radial connection (69) leading into the non-return valve housing (62), wherein both radial connections (53, 69) open into the axial channel (55).

8. The damping valve device (1) according to claim 6 or 7, characterized in that The bearing bolt (37T) has an axial stop (79) for fixing the cover (37D).

9. Damping valve arrangement (1) according to at least one of claims 1 to 8, characterized in that The valve base (37G) has a sleeve extension (37H) for a valve seat ring (81).

Images