DE102017106879B4 - Device for adjusting the level of a vehicle body - Google Patents

Abstract

Device for level adjustment of a vehicle body, comprising a rotationally driven, axially immovable threaded spindle (1) and a threaded nut (3) axially displaceable along the threaded spindle (1) or a rotationally driven, axially immovable threaded nut (3) with a threaded spindle (3) axially displaceable along the threaded nut (3) 1), wherein on the outer circumferential surface of the threaded nut (3) or the threaded spindle (1) a non-rotatably arranged toothed ring (4) is formed, which can be driven at least indirectly by an actuator (5), the actuator (5) being a gear unit (6 ) and a drive motor (7), characterized in that the gear unit (6) comprises a wobble gear (9) which can be driven at least indirectly by the drive motor (7), the wobble gear (9) having a first gear arranged on an eccentric (10) (11), which can be set in a tumbling movement by rotating the eccentric (10), the first gear wheel (1 1) a ring gear (12) is set in rotation by the wobbling movement and at least indirectly drives the ring gear (4), and the wobble gear (9) has a locking disk (13) for stepless locking of the gear unit (6), after which an acting, retroactive Torque cannot cause any adjustment of the eccentric (10) arranged in the gear unit (6) and a displacement of the threaded spindle (1) relative to the threaded nut (3) therefore only takes place by actively actuating the drive motor (7).

Description

The invention relates to a device for level adjustment of a vehicle body according to the preamble of claim 1. Generic devices for level adjustment of vehicle bodies are provided in particular for increasing the ground clearance of motor vehicles or lowering them on level roads in the struts of the motor vehicles.

From the DE 10 2014 215 420 A1 discloses a device for adjusting the height of a vehicle body, containing a movement thread arranged between the vehicle body and a wheel carrier. The movement thread displaces two components that can be displaced relative to one another between an upper and a lower adjustment position. The device further comprises a spindle, which is axially immovably connected to the first component and rotatably driven by an electric motor, and a non-rotatable and axially displaceable spindle nut, which is received on the spindle and connected to the second component in an axially immovable manner. In order to protect the movement thread against high mechanical loads, a switchable, axially effective form-fit that mechanically bridges the movement thread is provided between the components at least at the upper adjustment position.

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

This object is achieved by a device for adjusting the level of a vehicle body having the features of claim 1. Preferred or advantageous embodiments of the invention emerge from the subclaims of the following description and the attached figures.

A device according to the invention for level adjustment of a vehicle body comprises a rotationally driven, axially immovable threaded spindle and a threaded nut axially displaceable along the threaded spindle or a rotationally driven, axially immovable threaded nut with a threaded spindle axially displaceable along the threaded nut, with a gear rim arranged in a rotationally fixed manner on the outer peripheral surface of the threaded nut or the threaded spindle is formed, which can be driven at least indirectly by an actuator, wherein the actuator comprises a gear unit and a drive motor, wherein the gear unit comprises a wobble gear that can be driven at least indirectly by the drive motor, the wobble gear comprising a first gear arranged on an eccentric, which is driven by a Rotation of the eccentric can be set in a tumbling motion, the first gear wheel setting a ring gear in a rotary motion by the tumbling motion and at least medium ar drives the ring gear, and wherein the wobble gear has a locking disk for continuously locking the gear unit.

The device is provided to execute a lifting movement by axially displacing the threaded spindle with respect to the threaded nut and thereby to carry and lift the vehicle weight resting on this vehicle axle. In other words, the weight of the vehicle is essentially absorbed by the adjusting element in the device for the period of the raising. As a result, the height of the vehicle is changed and the vehicle can be brought into a desired target level position.

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

For example, the threaded nut is rotatably mounted in the device for level adjustment in an axially fixed manner, so that a rotary drive of the threaded nut leads to a longitudinal displacement of the threaded spindle with respect to the threaded nut, with the anti-rotation element connected to the threaded spindle and the threaded nut towards or towards each other depending on the direction of rotation of the drive motor driving the threaded nut be moved apart.

Alternatively, the threaded spindle is rotatably mounted axially fixed in the device for level adjustment by means of a threaded drive, a rotary drive of the threaded spindle leading to a longitudinal displacement of the threaded nut with respect to the threaded spindle, with the anti-rotation element connected to the threaded nut and the threaded spindle depending on the direction of rotation of the drive motor driving the threaded spindle to be moved to or away from each other.

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

In a motor vehicle with four wheels, a device according to the invention for adjusting the height of the vehicle body is preferably provided in each suspension strut of the motor vehicle. Alternatively, in a motor vehicle with four wheels, a device according to the invention for adjusting the height of the vehicle body is provided at least on the two spring 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.

The gear unit preferably has a second gear wheel, the second gear wheel being non-rotatably connected to the eccentric and being at least indirectly drivable by the drive motor. The second gear can be driven on the drive side, for example, by a drive shaft with toothing arranged on the drive motor, as a result of which the eccentric is set in rotation. The drive shaft is preferably designed as a pinion shaft. Preferably, the gear unit further has a third gear for at least indirect drive of the ring gear, the third gear being connected to the ring gear in a rotationally fixed manner. In other words, the third gear is provided to transmit the rotational movement of the ring gear generated by the wobbling movement of the first gear to the threaded nut connected to the gear rim in a rotationally fixed manner.

Furthermore, the first gearwheel preferably has at least two guide cams, which are at least partially in positive engagement with a respective elongated hole on the locking disk and are guided along a first guide direction. The longitudinal axes of the elongated holes are formed coaxially to the first guide direction. The gear unit preferably has a housing with at least two stationary bolts, the locking disk being guided along a respective elongated 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 to the second guide direction.

With a full rotation of the eccentric, the locking disk moves back and forth on a linear path along the second guide direction, the locking disk being guided in the respective elongated holes by means of the bolts fixedly arranged on the housing. The distance of this movement is twice the amount of eccentricity. The eccentricity is formed from the distance between the axis of rotation of the first gear and the axis of rotation of the second gear, or from the distance between an eccentric axis and a bolt axis. The eccentric axis runs through the center of a first eccentric diameter formed on the eccentric, the first gear being arranged so as to slide on the first eccentric diameter. The bolt axis corresponds to the longitudinal axis of the bolt arranged in the housing, the bolt axis also running through the center of a first eccentric diameter formed on the eccentric. The locking disk cannot be displaced along the first guide direction. However, the wobbling movement of the first gear with simultaneous movement of the locking disc along the second guide direction results in a relative movement between the locking disc and the guide cams guided in the respective elongated holes along the first guide direction, the guide cams being displaceable in the first guide direction.

The invention includes the technical teaching that the locking disk for locking the actuator is arranged in the gear unit in a rotationally fixed manner. The locking disk ensures that a retroactive torque acting on the third gear cannot cause any adjustment of the first or second gear or the eccentric arranged in the gear unit. Such a torque acting on the output shaft can be broken down into components in the area of the elongated holes, each of which acts at right angles to the guide direction or to the respective longitudinal direction of the respective elongated holes. The backlash-free design of the wobble gear is advantageous. A displacement of the threaded spindle with respect to the threaded nut by means of a screw drive can therefore only take place through active actuation of the drive motor. In this way, unwanted rotation of the threaded spindle, the threaded nut or the gear wheels or the eccentric arranged in the gear unit is prevented by the locking disk.

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 gear wheels, can be made from a plastic. Such a design of the gear unit also makes it possible to manufacture the second gear with the eccentric or also the third gear with the ring gear as a coherent, one-piece component.

• 1 eine vereinfachte schematische Seitenansicht einer jeweiligen erfindungsgemäßen Vorrichtung zur Niveauverstellung eines Fahrzeugaufbaus,
• 2 eine schematische Schnittdarstellung einer Getriebeeinheit der erfindungsgemäßen Vorrichtung,
• 3 eine schematische Explosivdarstellung der teilweise dargestellten Getriebeeinheit gemäß 2, und
• 4 eine schematische Draufsicht der Getriebeeinheit der erfindungsgemäßen Vorrichtung.

In the following, an exemplary embodiment of the invention is explained in more detail with reference to the four figures explained, wherein the same or similar components are provided with the same reference numerals. Here shows

• 1 a simplified schematic side view of a respective device according to the invention for adjusting the level of a vehicle body,
• 2 a schematic sectional view of a gear unit of the device according to the invention,
• 3 a schematic exploded view of the partially shown transmission unit according to 2 , and
• 4th a schematic plan view of the gear unit of the device according to the invention.

According to 1 An adjusting device according to the invention for level adjustment of a vehicle body - not shown here - comprises a rotationally driven, axially immovable threaded nut 3 with a threaded spindle secured against rotation 1 . In an alternative embodiment - not shown here - the adjusting device for level adjustment of a vehicle body has a rotationally driven, axially immovable threaded spindle 1 and one along the lead screw 1 axially displaceable threaded nut 3 on, with the threaded nut 3 is secured against rotation. The adjustment 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 takes an anti-rotation element at an upper distal end 21st on that is provided for the threaded spindle 1 secure against rotation and guide axially. For this purpose, 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. The threaded spindle is thus guided axially and secured against rotation. The threaded spindle takes an adjustment element 22nd on. The adjustment element 22nd is for example a damper sleeve which is intended to accommodate a damper - not shown here. The case 17th is designed such that it can hold a spring plate of the damper - not shown here - in a rotationally and axially fixed manner.

On the outer circumferential surface of the axially between the two bearing elements 23 arranged threaded nut 3 is a non-rotatable ring gear 4th formed with an actuator 5 is driven. The actuator 5 comprises a drive motor designed as an electric motor 7th and one in one case 17th arranged gear unit 6th . Radially between the threaded spindle 1 and the threaded nut 3 is a screw drive 2 formed, with rolling elements 25th of the screw drive 2 on the inner peripheral surface of the threaded nut 3 and on the outer peripheral surface of the lead screw 1 with axial displacement of the threaded spindle 1 against the threaded nut 3 roll off. The screw drive 2 is designed as a ball screw drive, the rolling elements 25th Bullets are. The balls of the ball screw drive roll when the threaded nut is turned 3 on running grooves, the threaded nut 3 an outer ring with running grooves and the threaded spindle 1 represents an inner ring with running grooves.

After 2 drives the in 1 shown drive motor 7th on a drive side of the gear unit 6th by means of a pinion - not shown here - a second gear 27 on, that rotates with one of a bolt 8th penetrated axially immovable eccentric 10 connected is. The bolt 8th is by means of two bearing elements 26th on a bolt axis B. non-rotatably on a housing 17th stored. Alternatively, the eccentric 10 also directly from the drive motor 7th are driven. The eccentric 10 also has an axially to a first eccentric diameter 29 adjacent second eccentric diameter 30th on, with the first eccentric diameter 29 the second gear 27 rotatably mounted and on the second eccentric diameter 30th one in a wobble gear 9 arranged first gear 11 is slidingly mounted. The eccentric 10 rotates around the bolt axis B. and offsets the first gear 11 in a tumbling motion. With a complete 360 degree rotation of the eccentric 10 describes the center of the first gear 11 that is on an eccentric axis A. is arranged an arc of a circle. 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 8th and the second gear 11 coaxial on the bolt axis B. and the second eccentric diameter 30th coaxial with the first gear 11 on the eccentric axis A. arranged.

The wobble gear 9 further comprises a ring gear 12 , the one with the first gear 11 meshes and by the wobbling motion of the first gear 11 is set in a rotation. On one output side of the gear unit 6th is a third gear 28 with the ring gear 12 operatively connected and provided to the threaded nut 3 non-rotatably arranged ring gear 4th to drive. Due to the reduction between the ring gear 12 and the first gear 11 turns the third gear 30th during the described movement of the eccentric 10 with a lower angular velocity. The wobble gear 9 also has an axially between the first and second gears 11 , 27 arranged locking disc 13th on that to lock the actuator 5 is provided, the first gear 11 two diametrically opposed guide cams 14th has that in a respective elongated hole 15th in the locking disc 13th are added and guided along a first longitudinal guide. The guide cams are located under the first longitudinal guide 14th along the longitudinal direction of the respective elongated hole 15th in an in 4th illustrated first guidance direction 16 to understand.

3 shows an exploded view of the gear unit 6th , the lock washer 13th two further diametrically opposite elongated holes 19th has, which are provided in 4th shown stationary on the housing 17th trained bolts 18th take up and guide in a second longitudinal guide. The guide for the bolts is under the second longitudinal guide 18th along the longitudinal direction of the respective elongated hole 19th in a second guidance direction 20th to understand. The longitudinal guides of the elongated holes 15th , 19th run radially to the axis of the bolt 8th , with the respective elongated holes 15th the guide cam 14th and the respective elongated holes 19th the bolt 18th alternately and evenly around the bolt axis B. are arranged distributed. With one revolution of the eccentric 10 the locking disc moves 13th in the second guidance direction 20th along which the bolts 18th receiving longitudinal guide of the elongated holes 19th back and forth. The movement in one direction is twice the eccentricity E. the eccentric axis A. to the bolt axis B. . Through the second longitudinal guide of the locking disc 13th becomes the wobbling motion of the wobbling first gear 11 only insofar on the locking disc 13th transferred as the tumbling motion extends toward the first longitudinal guide. The second longitudinal guide causes the circular wobbling motion of the first gear 11 around a circle with the radius of eccentricity E. around the bolt axis B. takes place, only those movement components on the locking disc 13th that are transferred in the first guide direction 16 run away. Movement components of the wobbling movement in the second guide direction 20th run, however, lead to a relative movement between the first gear 11 and the lock washer 13th .

The lock washer 13th is also non-rotatable via the two bolts 18th in the housing 17th attached. Through the lock washer 13th is achieved that one on the third gear 28 attacking torque no unwanted adjustment / rotation of the first gear 11 or the bolt 8th has the consequence. One on the third gear 28 The torque acting on the locking disc can be applied to the longitudinal guides 13th break them down into force components, which are perpendicular to the guide direction 16 , 20th attack the respective longitudinal guide. Due to the non-rotatable mounting of the locking disc 13th in the housing 17th is a lock of the actuator 5 ensured. The design of the respective longitudinal guides is basically arbitrary. The first longitudinal guide must ensure that the locking disc is 13th via a path that is double eccentricity E. only in the second guide direction 20th opposite the housing 17th can move. Likewise, the second longitudinal guide must ensure that the first gearwheel is in any design 11 and the lock washer 13th in the first guidance direction 16 can move relative to each other, the path of movement being double the eccentricity E. corresponds.

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

List of reference symbols

1

Threaded spindle

2

Screw drive

3

Threaded nut

4th

Ring gear

5

Actuator

6th

Gear unit

7th

Drive motor

8th

bolt

9

Wobble gear

10

eccentric

11

First gear

12th

Ring gear

13

Lock washer

14th

Guide cam

15th

Long hole

16

First direction of leadership

17th

casing

18th

bolt

19th

Long hole

20th

Second direction of leadership

21st

Anti-rotation element

22nd

Adjustment element

23

Bearing element

24

Support element

25th

Rolling elements

26th

Bearing element

27

Second gear

28

Third gear

29

First eccentric diameter

30th

Second eccentric diameter

A.

Eccentric axis

B.

Bolt axis

E.

eccentricity

Claims (10)

Device for adjusting the level of a vehicle body, comprising a rotationally driven, axially immovable threaded spindle (1) and a threaded nut (3) axially displaceable along the threaded spindle (1) or a rotationally driven, axially immovable threaded nut (3) with a threaded spindle (3) axially displaceable along the threaded nut (3) 1), wherein on the outer circumferential surface of the threaded nut (3) or the threaded spindle (1) there is a non-rotatable toothed ring (4) which can be driven at least indirectly by an actuator (5), the actuator (5) being a gear unit (6 ) and a drive motor (7), characterized in that the gear unit (6) comprises a wobble gear (9) which can be driven at least indirectly by the drive motor (7), the wobble gear (9) having a first gear arranged on an eccentric (10) (11) which can be set in a tumbling motion by rotating the eccentric (10), the first gearwheel ( 11) a ring gear (12) is set in rotation by the wobbling movement and at least indirectly drives the ring gear (4), and the wobble gear (9) has a locking disk (13) for stepless locking of the gear unit (6), after which an engaging retroactive Torque cannot cause any adjustment of the eccentric (10) arranged in the gear unit (6) and a displacement of the threaded spindle (1) relative to the threaded nut (3) therefore only takes place by actively actuating the drive motor (7). Device according to Claim 1 , characterized in that the gear unit (6) has a second gear (27), wherein the second gear (27) is connected to the eccentric (10) in a rotationally fixed manner and can be driven at least indirectly by the drive motor (7). Device according to one of the preceding claims, characterized in that the gear unit (6) also has a third gear (28) for at least indirect drive of the ring gear (4), the third gear wheel (28) being non-rotatably connected to the ring gear (12) . Device according to one of the preceding claims, characterized in that the first gear wheel (11) has at least two guide cams (14) which are at least partially positively engaged with a respective elongated hole (15) on the locking disk (13) and along a first guide direction (16) are performed. Device according to one of the preceding claims, characterized in that the locking disk (13) for locking the actuator (5) is arranged non-rotatably in the gear unit (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), the locking disk (13) along a respective elongated hole (19) of the respective bolt (18) ) is guided in a second guide direction (20) which is arranged perpendicular to the first guide direction (16). Device according to one of the preceding claims, characterized in that the threaded spindle (1) or the threaded nut (3) receives at an upper distal end at least one anti-rotation element (21) which is provided to secure the threaded spindle (1) against rotation and to guide axially. Device according to one of the preceding claims, characterized in that the threaded spindle (1) or the threaded nut (3) is rotatably supported by at least two bearing elements (23) and is axially guided by at least two supporting elements (24). Device according to one of the preceding claims, characterized in that the drive motor (8) is an electric motor. Device according to one of the preceding claims, characterized in that the gear unit (7) is at least partially formed from a plastic.

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