WO2016004939A1

WO2016004939A1 - Suspension actuator

Info

Publication number: WO2016004939A1
Application number: PCT/DE2015/200364
Authority: WO
Inventors: Daniel Faber; Benjamin Wübbolt-Gorbatenko
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-07-07
Filing date: 2015-06-12
Publication date: 2016-01-14
Also published as: DE102014213121A1

Abstract

Disclosed is a suspension actuator (1) comprising a spindle drive (11) that is coupled to a drive unit and includes a threaded spindle (13) and a recirculating ball-type nut (12) for axially adjusting a component (14) of a motor vehicle chassis; the suspension actuator (1) comprises a Maltese cross mechanism provided with a driving wheel (4) and a star wheel (8); the driving wheel (4) includes a pin (6) and a blocking disk (5) and is connected to the drive unit (2); the star wheel (8) is coupled to the driving wheel (4) and has slots (9) for the pin (6) as well as contours (10), the shape of which is mirror-inverted in relation to the blocking disk (5).

Description

Fahrwerksaktuator

The invention relates to a Fahrwerksaktuator, comprising a drive coupled to a spindle drive with a threaded spindle and a ball nut for axially adjusting a component of a chassis of a motor vehicle.

Oerartige electromechanical Fahrwerksaktuatoren be used in motor vehicles, for example, as a mechanical level control, Hinterachsverstellung or lane and / or camber adjustment.

A conventional electromechanical Fahrwerksaktuator has a spindle drive, comprising a Gewindespindei and a recirculating ball nut, wherein either the Gewindespindei axially stationary and rotatable or the recirculating ball nut is axially stationary and rotatable. The other component is moved in a rotation in Axiairichtung. Mitteis the spindle drive can thus be converted into a rotational movement in a shift or a shift in a rotational movement.

Chassis actuators require in many cases a standstill, to avoid unwanted steep movement, that is, an adjustment of the output. When the drive is off, therefore, a lock to block a

Output part needed because a spindle drive is not self-locking

From DE 102008024910 A1 an actuator with a standstill backup is known, which is based on Reibschiuss.

In addition, formschlössige Stiilstandssicherungen as a locking contour or a pin lock are known. In addition, an externally controlled electric, pneumatic or hydraulic lock can be used, but it is a separate one Control and a separate actuator required for its activation energy is needed.

Oer invention is therefore an object of the invention to provide an actuator having a positive self-locking standstill

To solve this problem is provided according to the invention in a Fahrwerksaktuator of the type mentioned that it comprises a Maltese cross gear having a pin and a locking disc exhibiting, drive wheel connected to the drive and a coupled with the drive wheel, slots for the pin and gegengleich Having formed to the locking disc contours having stamper.

The invention is based on the idea that the function of an automatic

Stiiidandssicherung can be realized by a Maltese cross gear, which is coupled on the one hand with the drive and on the other hand with the spindle drive. The known Maltese cross gear comprises on the one hand the rotatable drive wheel, which has the pin and a circular segment-shaped contour, and on the other hand, the stamper, which is moved stepwise by the drive wheel. By the stepwise movement of the star wheel is rotated, so that the spindle drive, in particular the threaded spindle or the ball nut can be axially positioned in the desired manner, whereby the Fahrwerksaktuator invention can be used for the axial positioning of the associated component of a chassis of a motor vehicle. In the suspension actuator according to the invention, the stamper has contours on which are formed equal to the locking disk.

When the component of the landing gear is positioned in the desired manner, the drive wheel is rotated by the drive in such a way that the locking disc touches the corresponding contours of the star wheel. When the drive is switched off, ie in the de-energized state, the star wheel is automatically locked by the locking disc. This avoids undesirable movement of the star wheel, even when torque is applied by the component of the chassis connected to the spindle drive. Accordingly, the Maltese cross transmission used in the Fahrwerksaktuator invention acts as an automatic, automatic standstill, without the need for an additional actuator would be required. According to a first embodiment of the invention Fahrwerksaktuators the star wheel can be connected to the Kugeiumiaufmutter Accordingly, the ball nut is rotated when the drive is turned. The ball nut is then rotatably but axially fixed. The meshing with the recirculating nut Gewndespindel is thereby moved axially, whereby the desired adjustment of the component of the chassis is effected.

According to an alternative embodiment of the invention, it may be provided that the star wheel is connected to the threaded spindle When the drive, the threaded spindle is thus rotated. The threaded spindle is rotatably arranged but axially stationary. The intermeshing with the threaded ball nut is moved accordingly axially, whereby the desired axial positioning of the connected to the Kugeiumiaufmutter component of the chassis is effected.

In the suspension actuator according to the invention, the spindle drive can be brought into a blocking position by rotating the locking disk: until it is in engagement with the counter-contour of the star wheel. The locking disk is preferably designed as a circular segment (pitch circle), the star wheel has a correspondingly opposite contour.

For certain applications, it may be advantageous for the Maltese crossbome to be coupled with an upstream pretranslation. In this way, a desired Drehmomentübersetzung be effected Alternatively or additionally, it may be provided in the Fahrwerksaktuator invention that the Maltese cross gear is coupled to a downstream Nachüberset2ung. The post-translation can be used analogously to the translation of an Orehmoments. According to the invention, the pretranslation and / or the retranslation can be formed, for example, as a belt drive or spur gear. In this way, a torque generated by the drive or a drive speed can be adjusted to a required value by means of the forward or post-translation.

The suspension actuator according to the invention is preferably designed as a level control or lane-angle adjustment or Hinterachsverstellung or coupled with it. Further advantages and details of the invention are explained below on the basis of exemplary embodiments with reference to the drawings. The drawings are schematic representations and show:

Figure 1 is a side view of the essential components of a Fahrwerksaktuators invention;

FIG. 2 shows a top view of the chassis actuator shown in FIG.

FIG. 3 is a side view of an exemplary embodiment of a chassis actuator according to the invention; and

Figure 4 shows an exemplary embodiment of a Fahrwerksaktuators invention with a Nachusetzung.

The chassis actuator 1 shown in FIG. 1 comprises a drive 2 embodied as an electric motor, whose drive shaft 3 is fixedly connected to a drive wheel 4 of a Maltese cross trolley. When the drive 2 is turned on, the drive shaft 3 rotates the drive wheel 4.

In the plan view of Figure 2 is shown that the drive wheel 4 has a locking contour or a locking disc 5, which is approximately semicircular. In Figure 1 it can be seen that the locking disc 5 in comparison to the drive wheel 4 has a greater thickness. In addition, the drive wheel 4 comprises a pin or pin 6 which is cylindrical and is arranged orthogonal to the base of the drive wheel 4. When the drive 2, the drive wheel 4 is rotated about its axis of rotation 7. The Maltese cross gear is formed by the drive wheel 4 and a star wheel 8 which is plate-shaped and has slots 9 (locking contours) and contours formed opposite the locking disc 5. In the illustrated embodiment, the star wheel 8 has a total of three slots 9 and three contours 10 each of which is alternately arranged. However, this embodiment is not to be considered as a restriction, as other designs with a smaller or larger number of slots and locking contours are possible.

The slots 9 and the contours 10 of the star wheel 8 are arranged and adapted to the drive wheel 4. that the pin 6 engages with a rotation of the drive wheel 4 with the locking disc 5 each in a slot while the star wheel 8 continues to rotate. In the further course of the pin moves β out of the corresponding slot 9 out and the locking disc 5 touches the locking contour 10. The surfaces slide on each other without the star wheel 8 is rotated. Accordingly, the starwheel 8 performs a clocked, incremental rotational movement during which the transmitted torque changes due to the changing effective "lift slopes".

In Figure 1 it can be seen that the star wheel 8 is coupled to a Spirtdeitrieb 11. The star wheel 8 is fixedly connected to a ball nut 12, which in turn meshes with a threaded spindle 13. The threaded spindle 13 is connected at its free end to a component 14 of a chassis of a motor vehicle, which is shown only schematically in Figure 1. Upon rotation of the star wheel 8, the ball nut 12 firmly connected thereto is rotated, so that the threaded spindle 13 is displaced axially, which is indicated by the double arrow 15. Accordingly, the component 14 connected to the threaded spindle can be displaced axially. In a reversal of the direction of rotation of the drive 2, the component 14 is again moved in the opposite axiaie direction Figure 2 shows the position in which the stamper 8 is in a blocking position. The (negative) contour 10 of the star wheel 8 is engaged with the (positive) locking disk 5. After the component 14 has been moved to the desired axial position, the drive 2 is turned off. By the positive connection of the contour 10 with the locking disc 5, a rotation of the star wheel 8 is prevented, the star wheel 8 is locked in the position shown in Figure 2. Even if a torque introduced via the component 14 acts, the stamper 8 can not move. Accordingly, the Maltese cross gear acts as an automatic, automatic lock of Fahrwerksaktuators 1 in the off state. FIG. 3 shows an exemplary embodiment in which the chassis actuator 1, which comprises the drive wheel 4 and the starwheel 8, additionally has a pre-translation, which is designed as a helical gear 16. The chassis actuator 1 shown in Figure 3 corresponds to that of Figure 1, for reasons of clarity, however, some components are not shown, for example, the spindle drive 11th

The spur gear 16 includes two meshing spur gears 17, 18. wherein the spur gear 17 is coupled to the drive 2. When the drive 2 is switched on, the spur gear 17 is set in rotation, which drives the spur gear 18, via which the drive wheel 4 is rotated. By means of the vorzusselzung the torque generated by the drive and the speed can be adjusted according to the requirements. The existing from the drive wheel 4 and the output star wheel 8 existing Maltese Cross tragedy is locked in the disarmed state. Furthermore, the spur gear is load-free in the off state.

FIG. 4 shows a further exemplary embodiment of a chassis actuator 1, which comprises the drive wheel 4 and the starwheel 8 in accordance with the preceding exemplary embodiments. which form a Maltese cross gear. Notwithstanding the preceding exemplary embodiments, the Maltese Cross is a Nachversetzung assigned in the form of a belt drive 19, comprising two pulleys 20, 21, which are coupled together by a belt 22 or a chain. By determining the diameter of the two pulleys 20, 21 speed and torque can be adjusted as needed. In Figure 4 it can be seen that when the drive 2, the drive wheel 4 is rotated. Accordingly, the star wheel 8 is rotated stepwise, which is fixedly coupled to a pulley of the belt drive 19. Thereby, the other pulley is driven, which is connected to the spindle drive 11.

The chassis actuator 1 shown in FIG. 4 is designed as a rear axle adjustment. in which the component 14 can be adjusted axially. LIST OF REFERENCE NUMBERS

1 suspension actuator

2 drive

3 drive shaft

4 drive wheel

5 locking disc

6 pen

7 axis of rotation

8 star wheel

9 seasons

10 contour

11 spindle drive

12 recirculating ball nut

13 threaded spindle

14 component

15 double-headed arrow

16 helical gear

17 spur gear

18 spur gear

10 belt drive

20 pulley

21 pulley

22 straps

Claims

claims

1. Fahrwerksaktuator (1) comprising a drive coupled to a spindle drive (11) with a threaded spindle (13) and a ball nut (12) for axial Versteilen a component (14) of a chassis of a power * vehicle, characterized in that the Fahrwerksaktuator (1) comprises a Maltese cross gear. a pinion (6) and a locking disc (5) having, with the drive (2) connected to the drive wheel (4) and one with the drive wheel (4) coupled slots (9) for the pin (6) and gegengleich to the Locking disc (5) formed contours (10) exhibiting star wheel (8). 2. Fahrwerksaktuator according to claim 1, characterized in that the

Star wheel (8) with the ball nut (12) is connected.

Fahrwerksaktuator according to claim 1, characterized in that the star wheel (8) with the threaded spindle (13) is connected 4. Fahrwerksaktuator according to any one of the preceding claims, characterized in that the spindle drive (11) by turning the locking disc (5) until they themselves 8. Fahrwerksaktuator according to any one of the preceding claims, characterized in that the Maltese Cross is coupled with an upstream pretranslation in engagement with the gegengeich trained contour of the star wheel (8).

Chassis actuator according to one of the preceding claims, characterized ge

indicates that the Maltese cross gear with a downstream

Post-translation is coupled

7. Fahrwerksaktuator according to claim 5 or 6, characterized in that the pretranslation and / or the retranslation is designed as a belt drive (19) or spur gear (16) or are. 8. Fahrwerksaktuator according to one of the preceding claims, characterized in that it is designed as a level control or Hinterachsverstellung or lane camber or is coupled thereto.