WO2018177469A1

WO2018177469A1 - Device for adjusting the height of a vehicle body

Info

Publication number: WO2018177469A1
Application number: PCT/DE2018/100258
Authority: WO
Inventors: Harald Hochmuth; Manfred Kraus; Benjamin Wübbolt-Gorbatenko
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-03-30
Filing date: 2018-03-23
Publication date: 2018-10-04
Also published as: DE102017106879A1; DE102017106879B4

Abstract

The invention relates to a device for adjusting the height of a vehicle body, comprising a rotatably driven, axially fixed threaded spindle (1) and a threaded nut that can be axially moved along the threaded spindle (1), or a rotatably driven, axially fixed threaded nut (3) with a threaded spindle (1) that can be axially moved along the threaded nut (3). A rotatably fixed toothed ring (4) is arranged on the outer peripheral surface of the threaded nut (3) or the threaded spindle (1), said toothed ring being drivable at least indirectly by means of an actuator (5), the actuator (5) comprising a transmission unit (6) and a drive motor (7), the transmission unit (6) comprising a wobble mechanism (9) that can be driven indirectly by the drive motor (7), the wobble mechanism (9) comprising a first toothed wheel (11) which is arranged on a cam in a sliding manner, and can adopt a wobble movement by rotation of the cam, the first toothed wheel (11) causing a ring gear (12) to rotate by means of the wobble movement and driving the toothed ring (4) at least indirectly, the wobble mechanism (9) comprising a locking disk (13) for stopping the transmission unit (6) in a continuously variable manner.

Description

Device for level adjustment of a vehicle body

The invention relates to a device for level adjustment of a vehicle body. Generic devices for level adjustment of vehicle bodies are provided in particular for increasing the ground clearance of motor vehicles or their lowering in even lanes in the struts of the motor vehicles.

DE 10 2014 215 420 A1 discloses a device for height adjustment of a vehicle body, comprising a movement thread arranged between the vehicle body and a wheel carrier. The movement thread displaces two between an upper and a lower adjustment position against each other movable components. The device further comprises an axially non-displaceably connected to the first component, electric motor-driven spindle and a rotatably and axially displaceable spindle nut which is received on the spindle and connected to the second member axially non-displaceable. In order to protect the movement thread against high mechanical loads, the movement thread mechanically bridging, switchable, axially effective positive locking is provided at least at the upper adjustment position between the components.

The object of the present invention is to further develop a device for level adjustment of a vehicle body.

This object is achieved by a device for level adjustment of a vehicle body with the features of claim 1. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims of the following description and the accompanying drawings.

A device according to the invention for level adjustment of a vehicle body, comprising a rotationally fixed axially non-displaceable threaded spindle and a threaded spindle axially displaceable threaded nut or a rotationally driven axially immovable nut with a threaded nut along the axially displaceable threaded spindle, wherein on the outer peripheral surface of the threaded nut or the threaded spindle a rotatably arranged sprocket is trained, the at least indirectly by an actuator is drivable, wherein the actuator comprises a gear unit and a drive motor, wherein the gear unit comprises an at least indirectly driven by the drive motor wobble gear, wherein the wobble gear comprises a cam disposed on a first gear, which by a rotation of the eccentric in a wobbling motion is displaceable, wherein the first gear is caused by the tumbling motion of a ring gear in a rotational movement and at least indirectly drives the ring gear, and wherein the wobble gear has a locking disc for stepless locking of the gear unit.

The device is intended to carry out a lifting movement by the axial displacement of the threaded spindle relative to the threaded nut and thereby to carry and lift the resting on this vehicle axle vehicle weight. In other words, the weight of the vehicle is substantially intercepted by the adjusting element in the device for the period of increase. As a result, a ride height of the vehicle is changed and the vehicle can be brought into a desired target level position.

Preferably, the threaded spindle or the threaded nut receives at an upper distal end at least one anti-rotation element, which is intended to secure the threaded spindle or the threaded nut against rotation and to guide axially. In other words, the anti-rotation element is non-rotatably connected to the threaded spindle or with the threaded nut, wherein the anti-rotation element may also be attached to the adjusting element. The anti-rotation element may have guide cams which axially guide the threaded spindle or the threaded nut in a housing and secure against rotation.

For example, the threaded nut is rotatably mounted axially fixed in the device for level adjustment, so that a rotary drive of the threaded nut leads to a longitudinal displacement of the threaded spindle relative to the threaded nut, wherein depending on the direction of rotation of the threaded nut driving drive motor connected to the threaded spindle anti-rotation element and the threaded nut towards each other or be moved apart. Alternatively, the threaded spindle is axially fixed in the device for level adjustment by means of screw rotatably mounted, wherein a rotary drive of the threaded spindle leads to a longitudinal displacement of the threaded nut relative to the threaded spindle, depending on the direction of rotation of the threaded spindle driving drive motor connected to the threaded nut anti-rotation element and the Threaded spindle are moved towards each other or apart.

The screw drive can in particular be designed as a ball screw drive, but it is also conceivable to design the screw drive as trapezoidal screw drive or planetary gear drive. Depending on the arrangement of the components, the threaded spindle and / or the threaded nut can be seen as being longitudinally displacing. Preferably, the threaded spindle or the threaded nut is rotatably supported by at least two bearing elements and axially guided by at least two support elements. Consequently, the adjustment and the anti-rotation element are guided axially.

Preferably, in a motor vehicle with four wheels in each strut of the motor vehicle, a device according to the invention for height adjustment of the vehicle body is provided. Alternatively, a device according to the invention for height adjustment of the vehicle body is provided in a motor vehicle with four wheels at least on the two struts of an axle. Furthermore, the actuator is preferably fastened between the wheel carrier and the lower spring plate or between the vehicle body and the upper spring plate. Preferably, the gear unit has a second gear, wherein the second gear rotatably connected to the eccentric and at least indirectly driven by the drive motor. The second gear can be driven, for example, on the drive side by a drive shaft arranged on the drive shaft with toothing, whereby the eccentric is set in rotation. The drive shaft is preferably designed as a pinion shaft. Preferably, the gear unit further comprises a third gear for at least indirect drive of the ring gear, wherein the third gear is rotatably connected to the ring gear. In other words, the third toothed wheel is provided for by the tumbling motion of the first toothed wheel. to transmit the generated rotational movement of the ring gear on the rotatably connected with the ring gear threaded nut.

Furthermore, the first toothed wheel preferably has at least two guide cams which are at least partially positively engaged with a respective slot on the locking disc and are guided along a first guide direction. The longitudinal axes of the elongated holes are formed coaxially with the first guide direction. Preferably, the gear unit has a housing with at least two stationary bolts, wherein the locking disk is guided along a respective oblong hole of the respective bolt in a second guide direction, which is arranged perpendicular to the first guide direction. The longitudinal axes of the respective elongated holes are formed coaxially with the second guide direction.

In a full rotation of the eccentric, the locking disc moves back and forth along a linear path along the second guide direction, wherein the locking disc is guided in the respective oblong holes by means of the stationary bolts arranged on the housing. The distance of this movement is twice the amount of eccentricity. The eccentricity is formed from the distance of the axis of rotation of the first gear to the axis of rotation of the second gear, or from the distance of an eccentric axis to a pin axis. The eccentric axis extends through the center of a eccentric formed on the first eccentric diameter, wherein the first gear is slidably disposed on the first eccentric diameter. The bolt axis corresponds to the longitudinal axis of the bolt arranged in the housing, wherein the bolt axis furthermore extends through the center of a first eccentric diameter formed on the eccentric. Along the first guide direction, the locking disc is not displaced. However, due to the wobbling movement of the first toothed wheel with simultaneous movement of the locking disc along the second guide direction, a relative movement between the locking disc and the guide cam guided in the respective oblong holes along the first guide direction, whereby the guide cams are displaceable in the first guide direction.

The invention includes the technical teaching that the locking disc for locking the actuator is arranged rotationally fixed in the transmission unit. Through the locking disc It is achieved that an acting on the third gear retroactive torque can cause no adjustment of the arranged in the gear unit first or second gear or the eccentric. Such a torque acting on the output shaft can be broken down into components in the region of the oblong holes, each of which acts at right angles to the guide direction or to the respective longitudinal direction of the respective oblong holes. The advantage here is the play-free design of the wobble mechanism. A displacement of the threaded spindle relative to the threaded nut by means of screw drive can therefore only take place by an active actuation of the drive motor. Thus, an unwanted rotation of the threaded spindle, the threaded nut or arranged in the gear unit gears or the eccentric is prevented by the locking disc.

In particular, the gear unit is at least partially formed from a plastic. For example, the entire gear unit can be made of plastic. Alternatively, only individual components, such as the gears, may be formed of a plastic. Furthermore, by such a design of the gear unit is possible to manufacture the second gear with the eccentric or the third gear with the ring gear as a coherent, one-piece component. In the following, an embodiment of the invention is explained in more detail with reference to the four figures, wherein the same or similar components are provided with the same reference numerals. In this case, a simplified schematic side view of a respective device according to the invention for level adjustment of a vehicle body,

FIG. 2 is a schematic sectional view of a gear unit of the device according to the invention;

Figure 3 is a schematic exploded view of the partially illustrated gear unit according to Figure 2, and Figure 4 is a schematic plan view of the gear unit of the device according to the invention.

According to FIG. 1, an adjustment device according to the invention for adjusting the level of a vehicle body, not shown here, comprises a rotationally driven, axially non-displaceable threaded nut 3 with a threaded spindle 1 secured against rotation. In an alternative - not shown here - embodiment, the adjusting device for level adjustment of a vehicle body on a rotationally driven axially immovable threaded spindle 1 and an axially displaceable along the threaded spindle 1 threaded nut 3, wherein the threaded nut 3 is secured against rotation. The adjusting device is mounted, for example, between a wheel carrier and a lower spring plate of a vehicle. But it is also conceivable to mount the device between the body and the upper spring plate. The threaded spindle 1 receives an anti-rotation element 21 at an upper distal end, which is intended to secure the threaded spindle 1 against rotation and to guide it axially. The anti-rotation element has for example - not shown here - guide cams, which are axially guided in longitudinal recesses of a - not shown here - housing. Thus, the threaded spindle is guided axially and secured against rotation. The threaded spindle receives an adjusting element 22. The adjusting element 22 is for example a damper sleeve, which is provided for receiving a - not shown here - damper. The housing 17 is designed such that it can take a - not shown here - spring plate of the damper rotatably and axially fixed.

On the outer peripheral surface of the axially arranged between the two bearing elements 23 threaded nut 3, a rotatably arranged sprocket 4 is formed, which is driven by an actuator 5. The actuator 5 comprises a drive motor 7 embodied as an electric motor and a gear unit 6 arranged in a housing 17. A screw drive 2 is formed radially between the threaded spindle 1 and the threaded nut 3, with rolling elements 25 of the screw drive 2 on the inner circumferential surface of the threaded nut 3 and roll on the outer peripheral surface of the threaded spindle 1 with axial displacement of the threaded spindle 1 against the threaded nut 3. The screw drive 2 is designed as a ball screw drive, wherein the rolling Body are 25 balls. The balls of the ball screw roll upon rotation of the threaded nut 3 on grooves, the threaded nut 3 is an outer ring with grooves and the threaded spindle 1 is an inner ring with grooves. According to Figure 2 drives the drive motor 7 shown in Figure 1 on a drive side of the gear unit 6 by means of a - not shown - pinion a second gear 27 which is rotatably connected to a penetrated by a bolt 8 axially immovable eccentric 10. The bolt 8 is rotatably mounted on a housing 17 by means of two bearing elements 26 on a pin axis B. Alternatively, the eccentric 10 can also be driven directly by the drive motor 7. The eccentric 10 further has an axially adjacent to a first eccentric diameter 29 second eccentric diameter 30, wherein mounted on the first eccentric diameter 29, the second gear 27 rotatably and on the second eccentric diameter 30 a arranged in a wobble gear 9 first gear 1 1 is slidably mounted. The eccentric 10 rotates about the pin axis B and sets the first gear 1 1 in a wobbling motion. In a complete rotation through 360 degrees of the eccentric 10 describes the center of the first gear 1 1, which is arranged on an eccentric axis A, a circular arc. The distance of the eccentric axis A to the bolt axis B is the degree of eccentricity E. Thus, the first eccentric diameter 29, the bolt 8 and the second gear 1 1 are coaxial with the bolt axis B and the second eccentric diameter 30 coaxial with the first gear 1 arranged on the eccentric axis A.

The wobble gear 9 further includes a ring gear 12 which meshes with the first gear 1 1 and is set by the tumbling motion of the first gear 1 1 in a rotation. On a driven side of the gear unit 6, a third gear 28 is operatively connected to the ring gear 12 and provided to drive the rotatably arranged on the threaded nut 3 ring gear 4. Due to the reduction between the ring gear 12 and the first gear 1 1 rotates the third gear 30 in the described movement of the eccentric 10 at a lower angular velocity. The wobble mechanism 9 also has an axially disposed between the first and second gear 1 1, 27 locking disc 13, which is provided for locking the actuator 5, wherein the first gear 1 1 has two diametrically opposed guide cam 14 which in a respective Slot 15 in the lock disc 13 is received and guided along a first longitudinal guide. The first longitudinal guide means the guide of the guide cams 14 along the longitudinal direction of the respective oblong hole 15 in a first guide direction 16 shown in FIG.

Figure 3 shows an exploded view of the gear unit 6, wherein the locking disc 13 has two more diametrically opposed slots 19, which are provided to accommodate recorded in Figure 4 stationary formed on the housing 17 bolts 18 in a second longitudinal guide and lead. The second longitudinal guide means the guidance of the bolts 18 along the longitudinal direction of the respective oblong hole 19 in a second guide direction 20. The longitudinal guides of the elongated holes 15, 19 extend radially to the axis of the bolt 8, where you respective slots 15 of the guide cam 14 and the respective slots 19 of the bolts 18 are arranged alternately and uniformly around the pin axis B. In one revolution of the eccentric 10, the locking disc 13 moves in the second guide direction 20 along the bolts 18 receiving longitudinal guide of the slots 19 back and forth. The movement in one direction amounts to twice the eccentricity E of the eccentric axis A to the pin axis B. By the second longitudinal guide of the locking disc 13, the tumbling motion of the first wobbling first gear 1 1 is transmitted to the locking disc 13 only as far as the tumbling motion extends in the direction of the first longitudinal guide. The second longitudinal guide causes of the circular wobbling movement of the first gear 1 1, which takes place around a circle with the radius of eccentricity E about the pin axis B, only those components of movement are transferred to the locking disc 13, which extend in the first guide direction 16. Movement components of the tumbling motion, which extend in the second guide direction 20, however, lead to a relative movement between the first gear 1 1 and the locking disc 13. The locking disc 13 is further rotatably mounted on the two bolts 18 in the housing 17. By the locking disc 13 is achieved that an attacking on the third gear 28 torque has no unwanted adjustment / rotation of the first gear 1 1 or 8 of the bolt result. A torque acting on the third toothed wheel 28 can be transmitted to the longitudinal guides of the locking disc 13 in force disassemble which attack at right angles to the guide direction 16, 20 of the respective longitudinal guide. Due to the rotationally fixed mounting of the locking disc 13 in the housing 17, a locking of the actuator 5 is ensured. The formation of the respective longitudinal guides is basically arbitrary. The first longitudinal guide must ensure that the locking disc 13 can move over the path, which corresponds to the double eccentricity E, only in the second guide direction 20 relative to the housing 17. Likewise, the second longitudinal guide of any design must ensure that the first gear 1 1 and the locking disc 13 in the first guide direction 16 can move relative to each other, wherein the movement path of the double eccentricity E corresponds.

According to Figure 4, the bolts 18 are fixedly connected to the housing 17 of the gear unit 6, wherein the bolts 18 are arranged radially outside of the ring gear 12 and diametrically opposite one another.

LIST OF REFERENCE NUMBERS

1 threaded spindle

2 screw drive

3 threaded nut

4 sprocket

5 actuator

6 gear unit

7 drive motor

8 bolts

9 wobble gear

10 eccentrics

1 1 First gear

12 ring gear

13 locking disc

14 guide cams

15 slot

16 First direction

17 housing

18 bolts

19 slot

20 Second direction

21 anti-rotation element

22 adjusting element

23 bearing element

24 support element

25 rolling elements

26 bearing element

27 second gear

28 Third gear

29 First eccentric diameter 30 Second eccentric diameter

A eccentric axis

B bolt axis

E eccentricity

Claims

claims

1 . Device for level adjustment of a vehicle body, comprising a rotationally driven axially immovable threaded spindle (1) and a threaded nut (3) axially displaceable threaded nut (3) or a rotationally driven axially immovable nut (3) with a along the threaded nut (3) axially displaceable threaded spindle ( 1), wherein on the outer peripheral surface of the threaded nut (3) or the threaded spindle (1) a rotatably arranged sprocket (4) is formed, which is at least indirectly driven by an actuator (5), wherein the actuator (5) has a gear unit (6 ) and a drive motor (7),

characterized in that the gear unit (6) comprises at least indirectly by the drive motor (7) drivable wobble mechanism (9), wherein the wobble mechanism (9) on an eccentric (10) arranged first gear (1 1), which by a Rotation of the eccentric (10) is set in a tumbling motion, wherein the first gear (1 1) by the tumbling movement of a ring gear (12) in a rotational movement and at least indirectly drives the ring gear (4), and wherein the wobble gear (9) a Locking disc (13) for stepless locking of the gear unit (6), according to which an engaging retroactive torque can cause displacement of the in the gear unit (6) arranged eccentric (10) and a displacement of the threaded spindle (1) against the threaded nut (3 ) Therefore, only by an active actuation of the drive motor (7).

2. Apparatus according to claim 1,

characterized in that the gear unit (6) has a second gear (27), wherein the second gear (27) rotatably connected to the eccentric (10) and at least indirectly driven by the drive motor (7).

3. Device according to one of the preceding claims,

characterized in that the gear unit (6) further comprises a third gear (28) for at least indirectly driving the ring gear (4), wherein the third gear (28) rotatably connected to the ring gear (12). - 2 -

4. Device according to one of the preceding claims,

characterized in that the first gear (1 1) at least two guide cams (14) which are at least partially positively engaged with a respective slot (15) on the locking disc (13) and guided along a first guide direction (16) are.

5. Device according to one of the preceding claims,

characterized in that the locking disc (13) for locking the actuator (5) rotationally fixed in the gear unit (6) is arranged.

6. Device according to one of the preceding claims,

characterized in that the gear unit (6) has a housing (17) with at least two stationary bolts (18), wherein the locking disc (13) along a respective slot (19) of the respective bolt (18) in a second guide direction (20) is guided, which is arranged perpendicular to the first guide direction (16).

7. Device according to one of the preceding claims,

characterized in that the threaded spindle (1) or the threaded nut (3) at an upper distal end at least one anti-rotation element (21) receives, which is intended to secure the threaded spindle (1) against rotation and axially.

8. Device according to one of the preceding claims,

characterized in that the threaded spindle (1) or the threaded nut (3) by at least two bearing elements (23) rotatably mounted and axially guided by at least two support elements (24).

9. Device according to one of the preceding claims,

characterized in that the drive motor (8) is an electric motor. - 3 -

10. Device according to one of the preceding claims,

characterized in that the gear unit (7) is formed at least partially NEM plastic.