DE102011014235A1 - Damping device for wheel suspension of e.g. passenger vehicle, has pumping device attached to chambers and valve arrangement and provided with flooding units, where output of one of units is controlled in individual manner - Google Patents

Abstract

The device (1) has a drive source (21), and a working cylinder (7) that is divided into two working chambers (11) by a working piston (9). A valve arrangement (15) is attached to the working chambers for causing damping of a wheel suspension (3). A bidirectional activation pumping device (17) is attached to the working chambers and valve arrangement for causing activation force on the suspension. The activation pumping device is provided with two flooding units (27, 29), where output of one of the flooding units is controlled in an individual manner. An independent claim is also included for a method for operating a damping device.

Description

The invention relates to a damping device of a wheel suspension of a vehicle, with a divided by a working piston into two working chambers working cylinder, a working spaces associated valve assembly by means of a damping of the suspension is effected and a working spaces and the valve assembly associated bidirectional activation pumping device by means of an activation force on the Wheel suspension is effected.

Damping wheel suspensions of a vehicle is known. This can be done, for example, electrically activated, wherein by means of an electrically operable activation pumping device in addition to a damping force, an activation force on the suspension is effected. Furthermore, it is known to influence and / or effect a damping characteristic of the damping device by means of a valve arrangement. By means of the damping and / or the activation force driving characteristics of the motor vehicle can be influenced. An unpublished application of the same applicant with the official file reference 10 2010 014 185.2 relates to a damping device for a wheel suspension of a motor vehicle, having a working space having a cylinder in which a working space in two chambers dividing piston is guided relative to the cylinder, with a electric machine and having a two-ported and driven by the electric machine pump device with two conveyors, wherein in one conveyor via one of the connections as the pressure side working fluid in one of the chambers is conveyed and in the other direction of delivery via the other of the connections as the pressure side working medium into the other of the chambers is eligible. From the DE 10 2006 015 136 A1 is a pump, in particular vane pump or roller-cell pump, which is designed at least two-stroke (double-flow) or mehrhubig, with a rotation group having a contour ring, a rotor with radial slots, in which radially displaceable wings or rollers are arranged, and for axial sealing side plates or Housing side walls with Saugnieren and pressure kidneys known. It is provided that within the rotation group, a flood can be influenced so that a substantially unpressurized circulating within the rotation group is made possible and thus that an external promotion by suction kidney and pressure kidney is prevented through.

The object of the invention is to provide an improved damping device for a suspension of a vehicle, in particular to allow a smaller-sized and / or quieter operable and / or less expensive producible activation pumping device of the damping device.

The object is at a damping device of a suspension of a vehicle, with a divided by a working piston in two working chambers working cylinder, a work space associated valve assembly by means of damping the suspension is effected and a working spaces and the valve assembly associated bidirectional Aktivierungspumpvorrichtung means of an activation force the suspension is achieved by the fact that the activation pumping device has at least two floods, wherein at least one output variable of at least one of the floods is individually controllable. At damping devices of suspensions of vehicles, especially motor vehicles, different requirements. In particular, these can be advantageously used for a so-called roll stabilization, for example during a constant circular drive and / or slalom drive and / or cornering of the vehicle and / or motor vehicle. For this purpose, for example, on the outside wheels an activation force for issuing of the wheel suspension associated wheels and turn inside the wheels corresponding to a reset. In this case, comparatively large pressures are required for comparatively small volume flows of the activation pump device. In addition, driving the vehicle over uneven terrain to accomplish, being required by means of the activation device, in particular for positively influencing the driving characteristics of the vehicle, especially in comfort aspects, at relatively low pressures comparatively large volume flows from the Aktivierungspumpvorrichtung. Advantageously, this fundamentally wide design of the activation pumping device can be advantageously accomplished by the multi-flow design and the independent control of the at least one of the floods, wherein in comparison to a single-flow design, a particularly high-torque dimensioning of a corresponding drive, for example an electric drive of the activation pumping device and / or a design for particularly high speeds to produce the relatively high volume flows are not required. Advantageously, to generate the comparatively high pressures at low flow rates, the at least one of the floods can be switched off, so that a corresponding drive torque for generating correspondingly high pressures is available exclusively to the other flows. In the other case, for generating the highest possible volume flows at relatively low pressures, advantageously, the corresponding drive torque of the electric drive source to all floods be distributed, with a maximum high flow rate is possible. The output variable of one of the floods can be understood in particular to mean a delivery pressure or a delivery pressure difference and / or a delivery volume flow.

In one embodiment of the damping device is provided that the at least one of the floods is short-circuited. Advantageously, a corresponding hydraulic medium can be pumped in a circuit substantially without pressure by means of the short-circuited flood, with a minimum amount of hydraulic energy being converted. The hydraulic energy saved thereby can advantageously be used for generating a higher pressure and the remaining flows.

In a further embodiment of the damping device is provided that the at least two floods are associated with a common shaft. Advantageously, one of the shaft associated drive unit, for example, an electric motor for driving the activation pumping device is sufficient. Alternatively and / or additionally, hydraulic energy can also be withdrawn via the shaft so that the activation pump device can also be operated in a generator mode.

In a further embodiment of the damping device is provided that the at least one of the floods can be decoupled from the shaft. Advantageously, the at least one of the floods can be decoupled from the mechanical energy flow of the shaft so that the entire drive energy of the shaft, for example of the electric motor, is available to the remaining floods, in particular in order to generate a comparatively high pressure.

In a further embodiment of the damping device is provided that the at least one of the floods in a decoupled state rotationally fixed and fluid-tight blockable. Advantageously, it can be ensured that no undesired bypass flow takes place via the at least one of the floods.

In a further embodiment of the damping device is provided that at least one of the floods by means of a 3/2-way valve either short-circuitable or switchable between the work spaces. Advantageously, by means of the 3/2-way valve, the at least one of the floods can be switched on or switched off by means of short-circuiting.

In a further embodiment of the damping device is provided that the pumping device has a separate pump per flood. Advantageously, the pumping device can be composed of individual, in particular freely available on a market, pumps composed. Advantageously, no mehrflutige construction in a component is required. Rather, it is advantageous for individual parts to be combined to form the pumping device according to the invention.

The object is also achieved in a method for operating a damping device, in particular a damping device described above, a suspension of a vehicle, with activation of the damping device by means of a Aktivierungspumpvorrichtung with at least two floods individually driving at least one output of at least one of the floods. This results in the advantages described above.

The object is finally achieved in a motor vehicle with a damping device described above. This results in the advantages described above.

Further advantages, features and details will become apparent from the following description in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. Described and / or illustrated features form the subject of the invention, or independently of the claims, either alone or in any meaningful combination, and in particular may additionally be the subject of one or more separate applications.

The same, similar and / or functionally identical parts are provided with the same reference numerals. Show it:

1 a schematic view of a damping device for a suspension of a vehicle;

2 a schematic view of an activation pumping device, usable for in 1 shown damping device;

3 a schematic view of another activation pumping device usable for the in 1 shown damping device; and

4 a schematic view of another activation pumping device, usable for in 1 shown damping device.

1 shows a damping device 1 one only by means of the reference numeral 3 indicated suspension of a vehicle only partially shown 5 , In the vehicle 5 it may in particular be a motor vehicle, in particular a passenger car, in particular a truck and / or the like.

The damping device 1 has a working cylinder 7 on, by means of a working piston 9 in two workrooms 11 shared. The working piston 9 is fluid-tight and longitudinally displaceable within the working cylinder 7 stored and fixed one of the suspension 3 for the transmission of activation and / or damping forces associated piston rod 13 assigned.

The workrooms 11 is a valve assembly 15 assigned. By means of the valve arrangement 15 For example, which may include check valves, throttles, adjustable throttles, pressure control valves, adjustable pressure control valves, and / or the like, damping of the suspension may be used 3 causes and / or influenced and / or controlled.

To activate the suspension 3 , ie for active retraction and / or extension of the piston rod 13 or for applying the same with activation forces, has the damping device 1 an activation pumping device 17 on. The activation pumping device 17 is designed as a hydraulic bidirectional generator pump and a shaft 19 a drive source 21 assigned. The drive source 21 For example, it can be designed as an electric machine, in particular as an electric motor generator. The activation pumping device 17 is double-flow with a first part pump 23 and a second sub-pump 25 designed. The first part pump 23 promotes a first flood 27 and the second part pump 25 in a second flood 29 , The two sub-pumps 23 . 25 For example, they can be designed as gear pumps.

The sub-pumps 23 and 25 are rotatable together the shaft 19 assigned. As a special feature is the second flood 29 or at least one output of the second flood 29 separately influenced, namely by means of a 3/2-way valve 31 , The 3/2-way valve is designed to be used in a first, in 1 shown switch position the second tide 29 to a pump port 33 the activation pump device 17 interrupts and at the same time the second part pump 25 hydraulically shorts. It can be seen that in this first switching position of the 3/2-way valve 31 the second part pump 25 without contribution to a delivery volume or absorption volume of the activation pump device 17 virtually torque-free on the shaft 19 rotates. Advantageously, almost the entire drive torque of the drive source 21 by means of the shaft 19 the first part pump 23 available, so that a comparatively small volume flow with a comparatively high pressure or delivery pressure difference between the pump port 33 and another pump port 35 the activation pump device 17 is eligible.

In a second switching position of the 3/2-way valve 31 this connects the pump port 33 with the second tide 29 or switches the second flood 29 the second part pump 25 continuously. At the same time, a parallel to the second sub-pump 25 led short circuit branch 37 interrupted, so the first part pump 23 and the second part pump 25 both make a hydraulic contribution, the total pumping volume flow between the pump port 33 and the other pump port 35 the activation pump device 17 is available.

To influence the second flood 29 , in particular of the 3/2-way valve 31 and the drive source 21 , In particular a generator and / or drive power, the damping device 1 a control device 39 on. Corresponding control and / or signal paths are in 1 indicated by dashed arrows.

2 shows a further activation pumping device 17 analogous to the in 1 shown activation pumping device 17 , In the following, only the differences are explained in more detail.

In contrast to the representation according to 1 has the activation pumping device 17 the first part pump 23 , the second part pump 25 and a third sub pump 41 on. Alternatively and / or additionally, it may be in the sub-pumps 23 . 25 and 41 to act as separate hydraulic motor generator pumps.

Another difference is a power and / or moment flow of the common wave 19 by means of a first clutch 43 and a second clutch 45 interruptible. At the clutches 43 and 45 these may be in particular dry clutches, magnetically switchable clutches and / or hydraulic clutches. The couplings 43 and 45 are between the first and second sub-pump 23 . 25 and between the second sub-pump 25 and the third part pump 41 arranged. As a result, for example, by opening the first clutch 43 the second part pump 25 and the third part pump 41 from the power flow of the shaft 19 be separated. When closing the first clutch 43 and opening the second clutch 45 can the second part pump 25 from the power flow of the shaft 19 be separated. Advantageously, therefore, either alone the first part of the pump 23 or the first part pump 23 together with the second part pump 25 or all sub-pumps 23 . 25 . 41 between the pump port 33 and the other pump port 35 promote a hydraulic medium.

A control of the couplings 43 and 45 can by means of the control device 39 take what's in 2 is symbolized by dashed signal lines and / or control lines.

Another difference is the second pump 25 and the third part pump 41 each by means of a blocking device 47 braked, so that this also at a pressure difference, at the pump port 33 and the other pump port 35 is applied, not without resistance with open couplings 43 and or 45 rotate. Rather, these can be achieved by means of the blocking devices 47 rotatably and fluid-tight be set.

3 shows a further activation pumping device 17 analogous to the in the 1 and 2 shown. In this respect, only the differences are discussed.

The activation pumping device 17 according to the 3 is like the activation pumping devices of the 1 and 2 bidirectionally operable. In contrast to the representation according to the 2 sit the sub-pumps 23 . 25 and 41 on the common wave 19 whose power flow can not be interrupted. Still, the second tide can 29 and a third flood 49 in the third part pump 41 promotes, by means of the control device 39 to be influenced. This is the sub-pumps 25 and 41 one short-circuit branch each 37 connected in parallel, each of the short-circuit branches 37 each a first control member 51 has, for example, an adjustable throttle. Besides, in the second flood 29 and the third flood 49 in each case a second control member 53 switched, by means of which a hydraulic flow of the second tide 29 and / or the third flood 49 can be influenced. The second control organ 53 For example, each may have an adjustable throttle. The tax organs 51 and 53 are by means of the control device 39 Ansteuebar, what in 3 is symbolized by dashed signal and / or control paths. The second control organs 53 are each between the pump port 33 and a junction of the respective short circuit branch 37 switched, so that optionally the floods 29 and or 49 can be switched consistently, while the short-circuit branches 37 by means of the first control organs 51 are blockable. In this switching state promote the second part pump 25 and the third part pump 41 together with the first part pump 23 between the pump port 33 and the other pump port 35 , In a further switching state, the second control organs 53 be shut off and the first controllers 51 be opened so that the second part pump 25 and / or the third part pump 41 over the short circuit branches 37 short-circuited, so to speak, except for internal power losses torque-free on the shaft 19 run in a hydraulic short circuit.

Alternatively and / or additionally, intermediate states of the control organs 51 and 53 conceivable.

Alternatively and / or additionally, the in 1 shown 3/2-way valve 31 be designed as a switching valve and / or alternatively as a proportional valve, for example as a spring-reset electrically actuated 3/2-way switching valve or proportional valve.

4 shows a further activation pumping device 17 analogous to the in the 1 to 3 shown activation pumping device 17 , In this respect, only the differences and the description of the 1 to 3 directed.

In contrast to the representation of the 1 has the activation pumping device 17 in the presentation of the 4 a total of three individual partial pumps 23 . 25 . 41 on, the second part of the pump 25 a 3/2-way valve 31 and the third part pump 41 also an identically constructed 3/2-way valve 31 assigned. Regarding the operation of the 3/2-way valves 31 will be on the description of 1 directed. Advantageously, the second tide 29 and / or the third flood 49 be switched on separately and / or short-circuited. A corresponding control can by means of the control device 39 respectively. The control device 39 may be part of a central control of the vehicle and / or part of a separate control unit. In particular, the control device 39 Part of a control of a longitudinal and / or transverse dynamics, in particular spring damper characteristic, body position control and / or the like.

Advantageously, by means of the damping device according to the invention 1 Situations like a stationary circle of the vehicle 5 and / or a slalom ride be accomplished, in the comparatively high pressures at a relatively low delivery or displacement of the activation pumping device 17 are required, wherein the activation pumping device 17 , in particular the sub-pumps 23 . 25 and 41 of the 1 to 4 , Can be made adjustable, so that their absorption volumes are variably adjustable. In addition, advantageous rides over a comparatively uneven road, by the activation pumping device 17 a comparatively high delivery volume at relatively low pressures requires, be accomplished. These can optionally be the sub-pumps 23 . 25 such as 41 if necessary, be switched on and off.

Advantageously, the drive source 21 comparatively small dimensions and designed for comparatively low speeds, which advantageously allows cost-effective production and low-noise operation.

LIST OF REFERENCE NUMBERS

1

damping device

3

Arm

5

vehicle

7

working cylinder

9

working piston

11

workrooms

13

piston rod

15

valve assembly

17

activation pump

19

wave

21

a drive source

23

first part pump

25

second part pump

27

first tide

29

second tide

31

3/2-way valve

33

pump port

35

pump port

37

Short circuit branch

39

control device

41

third part pump

43

first clutch

45

second clutch

47

blocking device

49

third tide

51

first control organ

53

second control body

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 102006015136 A1 [0002]

Claims (9)

Damping device ( 1 ) a suspension ( 3 ) of a vehicle ( 5 ), comprising: - one by means of a working piston ( 9 ) in two workrooms ( 11 ) split working cylinder ( 7 ), - one of the workspaces ( 11 ) associated valve assembly ( 15 ) by means of a damping of the suspension ( 3 ), - one of the workspaces ( 11 ) and the valve assembly ( 15 ) associated bidirectional activation pumping device ( 17 ) by means of an activation force on the suspension ( 3 ), characterized in that the activation pumping device ( 17 ) at least two floods ( 27 . 29 ; 27 . 29 . 49 ), wherein at least one output of at least one of the floods ( 29 ; 29 . 49 ) is individually controllable. Damping device according to the preceding claim, characterized in that the at least one of the floods ( 29 ; 29 . 49 ) is short-circuitable. Damping device according to one of the preceding claims, characterized in that the at least two floods ( 27 . 29 ; 27 . 29 . 49 ) of a common wave ( 19 ) assigned. Damping device according to one of the preceding claims, characterized in that the at least one of the floods ( 29 ; 29 . 49 ) from the wave ( 19 ) can be decoupled. Damping device according to the preceding claim, characterized in that the at least one of the floods ( 29 ; 29 . 49 ) in a decoupled state rotationally fixed and fluid-tight blockable. Damping device according to one of the preceding claims, characterized in that the at least one of the floods ( 29 ; 29 . 49 ) by means of a 3/2-way valve ( 31 ) optionally short-circuitable or between the working spaces ( 11 ) is switchable. Damping device according to one of the preceding claims, characterized in that the activation pumping device ( 17 ) per flood ( 27 . 29 ; 27 . 29 . 49 ) a separate sub-pump ( 23 . 25 ; 23 . 25 . 41 ) having. Method for operating a damping device ( 1 ), in particular a damping device ( 1 ) according to one of the preceding claims, a suspension ( 3 ) of a vehicle ( 5 ), comprising: activating the damping device by means of an activation pump device ( 17 ) with at least two floods ( 27 . 29 ; 27 . 29 . 49 ), - individually controlling at least one output variable of at least one of the floods ( 29 ; 29 . 49 ). Vehicle ( 5 ), in particular motor vehicle, is set up, designed and / or constructed for carrying out a method according to the preceding claim and / or with a damping device ( 1 ) according to one of the preceding claims 1 to 7.

Images