DE102008048950A1 - Pressure operated rotary motor for use in vehicle i.e. car, has piston axially adjustable in housing, and work spaces arranged on both sides of piston, where connection is provided between work spaces and closed or released by valve - Google Patents

Abstract

The motor (20) has a piston (23) axially adjustable in housing (21). Work spaces (D1, D2) are arranged on both sides of the piston (23). The motor is arranged in a divided stabilizer with which two stabilizer halves are rotatable to each other for adjusting vehicle movements. A torque is produced between stabilizer halves by action of pressure of the work spaces in connection with coupling elements (25, 26). A connection is provided between the work spaces and closed or released by a valve based on a driving condition of a vehicle.

Description

The The invention relates to a fluid-actuated swing motor according to the preamble of the first claim and finds particular with active chassis for vehicle stabilization application.

DE 197 54 539 C2 describes a swing motor, which is arranged in a split vehicle axle and having a cylinder with radial ribs on the cylinder inside, in the cylinder, a motor shaft is arranged with wings, wherein the ribs and the wings form working chambers, which are acted upon by a hydraulic pressure, whereby a rotation of the motor shaft relative to the housing takes place. One end of the housing is fixedly connected to a part of the vehicle axle and the other end formed as a rotary shaft and connected to the other part of the vehicle axle, so that vehicle movements can be compensated by a rotational movement of the rotary shaft and an associated rotation of the two parts of the vehicle axle. Cross channels create a connection between the working chambers. The transverse channels meet in a bottom of the motor shaft in a collecting space which adjoins a switching valve, which z. B. is designed as a solenoid valve and thus has no additional pressure medium connections, to be ensured in this solution that the switching valve has two flow directions. Depending on the lateral acceleration, a throttling between the working spaces can be generated by the switching valve. If the connection between the work rooms is completely interrupted, the stabilizer acts like a passive element. If the connection between the working spaces is more or less throttle-free, the stabilizer effect can be reduced to a minimum.

adversely is that an electrical connection for valve through the Swivel motor or through the Druckkammem must do what structurally complex and fluidly unfavorable is. Due to the arrangement of the transverse channels are inherent Stömungswiderstände generated, which is disadvantageous affect the activation of the system. The main disadvantage However, this solution is that the stabilizer effect Although it can be reduced to a minimum, but not perfect Activation of the swing motor is possible.

A generic swing motor for chassis stabilization with active suspension is in DE 102 45 457 B3 disclosed. The swing motor is placed there in a split axis of a stabilizer. In the housing, an axially movable piston and pressure medium connections are present, which extend to pressure chambers in front of and behind the piston. A rotary shaft is set in rotation by an axial movement of the piston, so that both parts of the axis can be rotated relative to each other. The conversion of the axial movement of the piston in a rotary movement of the rotary shaft via ball rods, which are fixed to the piston and the housing. For certain driving situations of a vehicle (especially a car), namely when driving straight ahead, it is necessary to realize a clearance, in which the axle halves of the stabilizer can rotate freely without applying a torque to each other via the pivot motor. In the case of known pressure-actuated rotary motors, this has hitherto only been complicated and unfavorable in terms of flow technology.

task The invention is a pressure medium actuated swing motor to compensate for vehicle movements creating a clearance the outputs of the stabilizer allows, so that the outputs of the slewing motor freely pivotable to each other / rotatable are and thereby has a simple structural design and fluidically favorable works.

These The object is achieved with the features of the first claim. Advantageous embodiments emerge from the subclaims.

Of the pressure medium actuated swivel motor of a vehicle, the is arranged in a split stabilizer and with which the two Stabilizer halves to compensate for vehicle movements According to the invention has a in a housing axially displaceable piston and on both sides arranged on the piston working spaces, which by pressurizing the Workspaces in conjunction with one or more coupling elements a torque between the stabilizer halves generated is and there is a connection between workspaces, by means of a valve depending on the driving condition the vehicle is closable or releasable. The release the connection between the pressure chambers is in particular switched on straight ahead, so that the connections of the Pan motor are decoupled from each other, creating a clearance is guaranteed.

Especially gives the valve only at low, acting on the swing motor Loads (straight ahead, lateral acceleration towards zero) the Connection between the workspaces free, otherwise the connection between the work rooms completely closed is. Preferably, the valve is hydraulically actuated and is thus in particular by means of a hydraulic control pressure open.

Preferably the valve is integrated into the piston of the swing motor, it is but also possible, this outside the case to mount the swing motor.

In In a preferred embodiment, the valve is made a valve cylinder having a first lid and a second lid, wherein in the valve cylinder, a valve piston axially displaceable is arranged. The valve piston has one, with a control pressure act on the first piston part and one, among others with the spring force of a compression spring acted upon second piston part on. Both piston parts lie with their outside diameters on the inner diameter of the valve cylinder and are over a diameter-reduced connector with each other connected / coupled. Between the first piston part and the second Piston part leads at least a first breakthrough from the first Working space to the interior of the valve cylinder and at least one second breakthrough from the second working space to the interior of the valve cylinder. To disconnect the connection between the first and second working space is between the first and second breakthrough a sealing surface formed on a radially inwardly facing shoulder in the valve cylinder, to the second piston part can be applied.

Between the first cover and the first piston part is a control pressure chamber formed to which a control pressure line leads. Between the outer diameter of the first piston part and the inner diameter of the valve cylinder sits a sealing the control pressure chamber seal.

Between the second lid and the second piston part is a compression spring space formed, in which a compression spring sits between second lid and second piston part supports. To the compression spring chamber leads at least one overflow to the second workspace.

Of the Diameter of the second piston part tapers in the direction to the sealing surface or the diameter-reduced connector preferably conical and is attached to the conical surface the sealing surface can be applied.

The Piston surfaces of the first and second piston part are so dimensioned that only with application of a control pressure of the valve piston can be lifted off the sealing surface with its second piston part, so that at any pressure conditions in the first and second working space ensures that both pressure chambers are separated.

The Arrangement of the valve cylinder is preferably carried out by means of a radial circulating Federal in a recess of the piston of the swing motor. Alternatively, it is also possible, the outside of the valve Housing of the swivel motor to attach, in which case the Interior of the valve cylinder with reaching through the housing Breakthroughs associated with the work spaces.

Prefers is the device for applying a control pressure with a Device for detecting the driving condition of the vehicle coupled to to ensure that there is no unintentional decoupling / clearance he follows.

With the means for detecting the driving condition are in particular the steering angle and / or the lateral acceleration and / or the roll angle of the vehicle can be detected / evaluated and as a control variable to the device for applying the control pressure forwarded.

With the solution according to the invention becomes a simple one Possibility to unlock the two pressure chambers created, whereby the two stabilizer halves independently Move each other when driving straight ahead, since housing and rotary shaft of the swing motor are decoupled from each other. A Restricting the connection between work rooms, the leads to hydraulic hardening of the system, is with the inventive solution significantly reduced, either a complete seal the work spaces realized or the connection between the workrooms produced essentially lossless becomes.

The Invention will be described below with reference to embodiments and associated drawings explained in more detail.

It demonstrate:

1 : Longitudinal section of the valve,

2 : Longitudinal section of a slewing motor with integrated valve in a piston.

In 1 is the longitudinal section of a hydraulically actuated valve 1 , with which a first working space D1 and a second working space D2 of a swivel motor (s. 2 ) are connectable or separable depending on the driving condition of a vehicle, shown in the open position. The valve 1 has a valve cylinder 2 with a first lid 3 and a second lid 4 on. Through the first lid 3 is enough a control line 5 into the interior of the valve cylinder 2 , In the valve cylinder 2 is a valve piston 6 arranged axially displaceable, wherein the valve piston 6 a pressurizable with a control pressure piston first part 7 and a second piston part 8th having. Both piston parts 7 . 8th lie with their outer diameters on the inner diameter of the valve cylinder 2 and are about a diameter-reduced connector 9 With connected to each other. The second piston part 8th points towards the connector 9 a conical (tapered) area 8.1 on.

Between the first lid 3 and the first piston part 7 there is a control pressure chamber DS, between the second lid 4 and the second piston part 8th is a compression spring 10 in a compression spring chamber 10.1 arranged between the second lid 4 and second piston part 8th supported.

Between first and second piston part 7 . 8th lead towards the first piston part 7 several first breakthroughs 11 from the first working space D1 in the valve cylinder 2 and toward the second piston part 8th several second breakthroughs 12 from the second working space D2 in the valve cylinder 2 , Between the first and second breakthroughs 11 . 12 is on the valve cylinder 2 a radially inwardly facing radially circumferential shoulder 13 arranged, in the direction of the second piston part 8th a sealing surface 14 is arranged. To the sealing surface 14 is the rejuvenating area 8.1 of the second piston part 8th for separating the connection between the first and second working space D1, D2 can be applied (not shown here).

According to 1 can the existing in the pressure chambers D1, D2, not shown pressure medium freely through the openings 11 . 12 and the gap between connector 9 and inner diameter of the valve cylinder 2 and inside diameter of the paragraph 13 flow.

The control of the valve 1 via the control line 5 , It leads directly into the only sealed space of the valve 1 , in the form of the control pressure chamber DS. There then the control pressure acts on the entire circular piston surface A1 of the first piston part 7 , The first piston part 7 points towards the second piston part 8th a second annular piston surface A2. The second piston part 8th also has a third annular piston surface A3 in the direction of the first piston part and has a direction towards the second cover 4 a fourth piston surface A4, which in particular has the same size as the first piston surface A1. Also preferred are the effective piston surfaces A2 and A3 in the open state of the valve 1 same size.

The Piston surfaces A2 to A4 are with working chamber pressure of the pressure chambers D1, D2 acted against the piston surface A1 acts the Control pressure.

Through this area distribution is achieved that the gem. 1 open valve 1 when reducing the control pressure or without applied control pressure alone by the working space pressure D1, D2 and / or the spring force of the compression spring 10 closes, if the resultant is greater than the pressure prevailing in the control pressure chamber DS.

To the valve 1 gem. 1 To open, therefore, the control pressure in the control pressure chamber DS must be greater than the resultant force from the working space pressures D1, D2 and the spring force of the compression spring 10 be. The spring preferably serves as a return spring and has a comparatively low spring force. As a result, she sets an opening process, the z. B. is made with 180 bar, no significant resistance.

The activation gem. 1 should be done when low loads (only when driving straight ahead when the lateral acceleration is close to zero) on the swivel motor 1 Act.

When the valve is closed 1 act other piston surfaces. If no first working pressure D1 is present and a second working pressure D2 prevails, the valve piston moves 6 towards the sealing surface 14 until it touches it.

If there is a pressure D1 in the first working space and no pressure D2 acts, the pressure D1 acts on the entire second piston area A2 and only on a small effective area of the third piston area A3 between the connecting piece 9 and inner edge of the sealing surface 14 so that the resultant force is the valve piston 6 to the sealing surface 14 presses and the valve 1 remains closed.

In the spring chamber 10.1 in which the compression spring 10 sits, leads from the second working space D2 at least one overflow 10.2 , This serves to serve the oil from the second working space D2 in this pressure spring space 10.1 to guide to the volume of oil, resulting in opening and closing the valve 1 displaced or sucked in, ready to put. With the overflow opening 10.2 is also ensured that the piston surface A4 of the second piston part 8th , which are crucial for closing the valve 1 is, with the pressure prevailing in the second working space D2 pressure is applied.

At the outer diameter of the valve is a flange 15 provided with which it on the piston of the swing motor 20 (S. 2 ) is attachable.

The longitudinal section of a swivel motor with integrated valve in a piston is in 2 shown. The swivel motor 20 has a housing 21 on, against which a rotary shaft 22 is rotatable / pivotable. The rotary shaft 22 is connected to one half of a stabilizer, not shown, and the housing 21 with the other half of a stabilizer, which is coupled to the front axle or rear axle of a vehicle. By a pivoting movement between housing and shaft Both halves of the stabilizer are turned towards each other, whereby vehicle movements can be compensated. It is desirable that the stabilizer halves can rotate freely / decoupled from each other when driving straight ahead, so as to ensure a clearance.

The rotational movement between housing 21 and wave 22 is moved axially and rotatably in the housing 21 stored piston 23 in connection with first coupling elements 24 that between housing 21 and pistons 23 are arranged pivotally and second coupling elements 25 between pistons 23 and rotary shaft 22 are arranged, by pressurizing a first working space D1 and / or a second working space D2 causes, wherein the pressure chambers D1 and D2 on both sides of the piston 23 in the case 21 are formed and can be acted upon by pressure via not shown connection lines. Is z. B. the working space D2, between the piston 23 and rotary shaft 22 in the housing 21 is formed, depressurized and the working space D1, on the other side of the piston 23 when pressurized, the piston moves 23 towards the rotary shaft 22 and by the first coupling elements 24 is a torque on the piston 23 transfer. Because the piston 23 over the second coupling elements 25 with the rotary shaft 22 is also connected to this by axial lifting movement and the rotational movement of the piston 25 transmit a torque, so that the rotary shaft 22 in relation to the housing 21 performs a pivoting movement. If the pressure in the first working space D1 is reduced and pressure is generated in the second working space D2, so that the pressure in the second working space D2 is greater than the pressure in the first working space D1, the piston moves 23 from the rotary shaft 22 away and there will be an opposite rotational movement on the rotary shaft 22 transfer. If the pressure in both pressure chambers D1, D2 is equal, the swing motor acts 20 as a rigid connection between the stabilizer halves, not shown.

The first and second coupling elements 24 . 25 are preferably formed as ball rods and at both ends with the balls 26 swiveling on the housing 21 and on the piston 23 (Coupling elements 24 ) or pivotally on the piston 23 and at the rotary shaft 22 (Coupling elements 25 ) and fixed by means of unspecified fasteners ball joint shape. They continue to show a movement of the piston 23 changing spatial angular position.

To a decoupling between housing 21 and rotary shaft 22 to achieve such that the rotary shaft 21 free to the housing 21 can twist / pivot, is in the swing motor 20 a valve 1 integrated, with which under certain driving conditions, a connection between the pressure chambers D1, D2 can be made. This in 1 illustrated valve 1 is gem. Embodiment in 2 in the pistons 23 the swing motor 20 integrated. For this purpose, the piston 23 a breakthrough, at its inner diameter of the outwardly facing flange 15 of the valve 1 is fastened. On the rotary shaft 22 opposite side is the case 21 the swing motor 20 with a closure lid 27 locked. The cap 27 has a central hole 28 on, in which the control line 5 the valve is mounted rotatably and axially movable. This is required as the valve 1 is moved axially and pivoted together with the piston movement. The pressure medium supply to the control line 5 Upper is a supply line 29 passing through the cap 27 leads.

Gem. 2 is the valve 1 opened (as in 1 ), so that a connection between the pressure chambers D1, D2 is present (illustrated by dashed lines). The housing 21 and the rotary shaft 22 can thus rotate freely with each other.

alternative an embodiment not shown it is also possible, the valve on the outside of the housing to mount the swing motor.

1

Valve

2

valve cylinder

3

first cover

4

second cover

5

control line

6

plunger

7

first piston part

8th

second piston part

9

joint

10

compression spring

10.1

Pressure spring chamber

10.2

overflow

11

first breakthroughs

12

second breakthroughs

13

paragraph

14

sealing surface

15

flange

20

swing motor

21

casing

22

rotary shaft

23

piston

24

first coupling elements

25

second coupling elements

26

roll

27

cap

28

centric drilling

29

supply

A1

first piston area

A2

second piston area

A3

third piston area

A4

fourth piston area

D

seal

DS

Control pressure chamber

D1

first working space

D1

second working space

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 19754539 C2 [0002]
• - DE 10245457 B3 [0004]

Claims (17)

Pressure medium actuated pivot motor of a vehicle, which is arranged in a split stabilizer and with which the two stabilizer halves are pivotable to each other to compensate for vehicle movements, wherein the pivot motor ( 20 ) one in a housing ( 21 ) axially displaceable piston ( 23 ) and on both sides of the piston ( 23 ) arranged working spaces (D1, D2) and by pressure medium loading of the working spaces (D1, D2) in conjunction with one or more coupling elements ( 25 . 26 ) a torque between the stabilizer halves can be generated, wherein there is a connection between the working spaces, which by means of a valve ( 1 ) is closable or releasable depending on the driving condition of the vehicle. Pressure medium actuated pivoting motor according to claim 1, characterized in that the valve ( 1 ) only at low, on the swivel motor ( 20 ) acting loads (straight ahead, lateral acceleration to zero) the connection between the work rooms releases and otherwise the connection between the work spaces is completely closed. Pressure medium actuated pivoting motor according to claim 1 or 2, characterized in that the valve ( 1 ) is hydraulically actuated. Druckmittelbetätigbarer swing motor according to one of claims 1 to 3, characterized in that the valve ( 1 ) is opened by means of a hydraulic control pressure. Druckmittelbetätigbarer swing motor according to one of claims 1 to 4, characterized in that the valve ( 1 ) in the piston ( 23 ) of the swivel motor ( 20 ) integrated or outside of the housing ( 21 ) of the swivel motor ( 20 ) is attached. Pressure medium actuated pivoting motor according to one of claims 1 to 5, characterized in that the valve ( 1 ) from a valve cylinder ( 2 ) with a first lid ( 3 ) and a second lid ( 4 ), in which a valve piston ( 6 ) is arranged axially displaceable, wherein the valve piston ( 6 ), which can be acted upon by a control pressure, the first piston part ( 7 ) and one, at least with the spring force of a compression spring ( 10 ) acted upon second piston part ( 8th ), with their outer diameters on the inner diameter of the valve cylinder ( 1 ) and via a diameter-reduced connector ( 9 ) are connected to each other and between the first piston part ( 7 ) and the second piston part ( 8th ) at least a first breakthrough ( 11 ) from the first working space (D1) to the interior of the valve cylinder ( 2 ) and at least a second breakthrough ( 12 ) from the second working space (D2) to the interior of the valve cylinder ( 2 ) and for separating the connection between first and second working space (D1, D2) between first and second breakthrough ( 11 . 12 ) a sealing surface ( 14 ) on a radially inwardly pointing shoulder ( 13 ) in the valve cylinder ( 2 ) is formed, to which the second piston part ( 8th ) can be applied. Druckmittelbetätigbarer swing motor according to one of claims 1 to 6, characterized in that between the first lid ( 3 ) and the first piston part ( 7 ) a control pressure space (DS) is formed, to which a control pressure line ( 5 ) leads. Druckmittelbetätigbarer pivoting motor according to claim 7, characterized in that between the outer diameter of the first piston part ( 7 ) and the inner diameter of the valve cylinder ( 2 ) a control pressure chamber (DS) sealing gasket (D) sits. Druckmittelbetätigbarer swing motor according to one of claims 1 to 8, characterized in that between the second cover ( 4 ) and the second piston part ( 8th ) a compression spring chamber ( 10.1 ) is formed, in which a compression spring ( 10 ) between the second lid ( 4 ) and second piston part ( 8th ) is supported. Pressure medium actuated pivoting motor according to claim 9, characterized in that from the second working space (D2) to the compression spring space ( 10.1 ) at least one overflow opening ( 10.2 ) leads. Druckmittelbetätigbarer swing motor according to one of claims 1 to 10, characterized in that the diameter of the second piston part ( 8th ) towards the sealing surface ( 14 ) / to the diameter-reduced connector ( 9 ) decreased. Druckmittelbetätigbarer swing motor according to claim 11, characterized in that the diameter of the second piston part ( 8th ) reduced conically. Druckmittelbetätigbarer swing motor according to one of claims 1 to 12, characterized in that the piston surfaces (A1, A2) of the first and the piston surfaces (A3, A4) of the second piston part ( 8th ) are dimensioned so that only with application of a control pressure of the valve piston 6 with its second piston part ( 8th ) from the sealing surface ( 14 ) can be lifted. Pressure medium actuated pivoting motor according to one of claims 5 to 13, characterized in that the valve cylinder ( 2 ) by means of a radially circumferential flange ( 15 ) in a recess of the piston ( 23 ) of the swivel motor ( 20 ) attached is. Druckmittelbetätigbarer swing motor according to one of claims 5 to 13, characterized in that the outside of the housing ( 21 ) attached valve cylinder ( 2 ) with through the housing ( 21 ) of the swivel motor ( 20 ) reaching breakthroughs with the work spaces (D1, D2) is connected. Druckmittelbetätigbarer swing motor after a of claims 1 to 15, characterized in that a Device for applying a control pressure with a device is coupled to detect the driving condition of the vehicle. Druckmittelbetätigbarer swing motor after a of claims 1 to 16, characterized in that with the means for detecting the driving condition of the steering angle and / or detects the lateral acceleration and / or the roll angle of the vehicle and as a control quantity to the device for application the control pressure is forwarded.