DE102017129717A1 - Roll stabilizer for a motor vehicle - Google Patents

Abstract

The invention relates to a roll stabilizer (1) for a motor vehicle having a first stabilizer arm (21) and a second stabilizer arm (22) that can be torsionally stressed, and a coupling device (15) for coupling a first end (23) of the first stabilizer arm (21) having a second end (24) of the second stabilizer arm (22), which is convertible from a locking position to a release position, wherein in the locking position, the first end (23) and the second end (24) rotatably coupled to each other a rigid behavior of the roll stabilizer (1) to obtain, and the first end (23) and the second end (24) in the release position against each other by a predetermined maximum angle are rotatable to provide a soft behavior of the roll stabilizer (1), wherein the coupling means (15) first jaws (41) which define the first end (23) of the first stabilizer arm (21) in the locking position and in de Release release position, and second jaws (42) which define the second end (24) of the second stabilizer arm (22) in the locked position and release in the release position.

Description

The invention relates to a roll stabilizer for a motor vehicle having a first stabilizer arm and a second stabilizer arm claimable to torsion, and having a coupling means for coupling a first end of the first stabilizer arm with a second end of the second stabilizer arm, from a locking position to a release position is convertible, wherein in the locking position, the first end and the second end are rotatably coupled together to obtain a rigid behavior of the roll stabilizer, and the first end and the second end in the release position against each other by a predetermined maximum angle are rotatable to a soft To provide behavior of the roll stabilizer.

Such a roll stabilizer is from the WO 2005/056316 A1 known. The stabilizer arms of this roll stabilizer are coupled via a coupling device whose rigidity is adjusted via the viscosity of a magneto-rheological fluid. In this roll stabilizer, it has proved to be disadvantageous that a pressure vessel for the magneto-rheological fluid must be kept, which occupies a certain space and is maintenance-intensive.

Against this background, the task arises of specifying a compact roll stabilizer with adjustable rigidity.

The object is achieved by a roll stabilizer for a motor vehicle with a first stabilizer arm and a second stabilizer arm claiming torsion, and with a coupling device for coupling a first end of the first stabilizer arm with a second end of the second stabilizer arm, which from a locking position in a release position is convertible, wherein in the locking position, the first end and the second end are rotatably coupled together to obtain a rigid behavior of the roll stabilizer, and the first end and the second end in the release position against each other by a predetermined maximum angle are rotatable to provide a soft behavior of the roll stabilizer, wherein the coupling means comprises first jaws which define the first end of the first stabilizer arm in the locking position and release in the release position, and second jaws, the second end of the z Set wide stabilizer arm in the locked position and release in the release position.

The coupling device of the roll stabilizer according to the invention sets in its locking position, the ends of the stabilizer arms against each other, so that a maximum stiff behavior of the roll stabilizer can be achieved. By contrast, the ends of the two stabilizer arms in the release position of the clutch device are mutually rotatable by a predetermined maximum angle, whereby a soft state of the roll stabilizer is provided. The coupling device can be transferred from the locking position into the release position, so that optionally a high rigidity or a low rigidity can be set. Since the coupling device has clamping jaws, via which the ends of the stabilizer arms can be selectively set or released, the coupling device can be made compact and requires in particular no hydraulic or magneto-rheological fluids.

The roll stabilizer according to the invention is preferably suitable for those applications in which a reaction time of more than one second is sufficient.

According to an advantageous embodiment, the coupling device can be transferred to an intermediate position, in which the first end and the second end relative to the housing is rotatable about a predetermined intermediate angle, which is smaller than the maximum angle. In this respect, the rotational range of the first end relative to the second end in the intermediate position is more limited than in the release position. In the intermediate position of the coupling device, the roll stabilizer may therefore have a rigidity which lies between the high rigidity in the locking position and the low rigidity in the release position.

According to an advantageous embodiment, the coupling device by means of a motor, in particular an electric motor, the roll stabilizer from the locking position into the release position and possibly in the intermediate position can be transferred. By the motor, in particular electric motor, a compact drive for transferring the coupling device from the locking position to the release position and vice versa can be provided. Preferably, the motor is purely mechanically coupled to the coupling device, so that the use of hydraulic or magneto-rheological fluids is not required.

Preferably, the jaws are arranged in the locking position of the coupling device in a clamping position in which the jaws have a first distance from each other, and arranged in the release position of the coupling device in an open position in which the jaws have a second distance from each other, which is larger than that first distance. About the second distance of the jaws of the Maximum angle determined by which the ends can be rotated against each other maximum. Preferably, the first jaws and second jaws are each biased by spring elements in the direction of their clamping position.

According to an advantageous embodiment, the clamping jaws are in each case against an inner contour of a coupling bushing of the coupling device, which is arranged movably in an axial direction of the housing of the roll stabilizer. Preferably, the inner contour of the coupling bush is frusto-conical, so that the distance between the first jaws to each other or the distance of the second jaws can be adjusted to each other by the respective coupling socket abut the inner contour of the jaws along the axial direction of the housing is moved. It has proven to be advantageous if the coupling bushings have on their outer contour an external thread which is in engagement with an internal thread of a rotatable relative to the housing drive bushing. This makes it possible to effect a movement of the coupling bushing along the axial direction of the housing by a rotational movement of the drive bushing. The drive bush is preferably rotatably arranged by a motor, in particular an electric motor. It is particularly advantageous if the first clamping jaws are arranged within a first coupling bushing and the second clamping jaws within a second coupling bushing, wherein the first coupling bushing has a first external thread and the second coupling bushing has a second external thread and the first and the second external thread have opposite directions of rotation. Preferably, two internal threads corresponding to the first external thread and the second external thread are provided on the rotatable drive bush, which likewise have opposite directions of rotation.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen Wankstabilisators in einer schematischen Schnittdarstellung;
• 2 ein Ende eines Stabilisatorarms des Wankstabilisators nach 1 in einer perspektivischen Detaildarstellung;
• 3 die Kupplungseinrichtung des Wankstabilisators aus 1 in einer Verriegelungsstellung gezeigt einer Schnittdarstellung entlang der Schnittebene A-A in 1;
• 4 die Kupplungseinrichtung aus 3 in einer Freigabestellung; und
• 5 ein Diagramm des an dem Wankstabilisator anliegenden Drehmoments über dem Drehwinkel für die Verriegelungsstellung, Zwischenstellung und die Freigabestellung zur Veranschaulichung der einstellbaren Steifigkeit des Wankstabilisators.

Further details and advantages of the invention will be explained below with reference to the embodiment shown in the drawings. Hereby shows:

• 1 an embodiment of a roll stabilizer according to the invention in a schematic sectional view;
• 2 one end of a stabilizer arm of the roll stabilizer 1 in a perspective detail view;
• 3 the coupling device of the roll stabilizer 1 shown in a locking position of a sectional view along the cutting plane AA in 1 ;
• 4 the coupling device 3 in a release position; and
• 5 a diagram of the torque applied to the roll stabilizer over the rotation angle for the locking position, intermediate position and the release position to illustrate the adjustable stiffness of the roll stabilizer.

In the 1 is an embodiment of a roll stabilizer according to the invention 1 with adjustable stiffness suitable for use in a motor vehicle. About the roll stabilizer 1 Unwanted rolling movements of the motor vehicle can be reduced in particular when cornering and / or steering movements. The roll stabilizer 1 includes a first stabilizer arm 21 and a second stabilizer arm 22 that are claimable on torsion. In this respect, the stabilizer arms 21 . 22 designed as torsion bar springs. The stabilizer arms 21 . 22 are arranged substantially parallel to one another along an axial direction R.

The roll stabilizer 1 further comprises a housing 2 , According to the embodiment, the housing 2 a substantially cylindrical first housing part 90 and two on the end faces of the first housing part 90 arranged second housing parts 100 . 110 . 120 on. On the case 2 is for each of the two stabilizer arms 21 . 22 a rolling bearing 20 arranged, in particular a radial-axial roller bearing. About the rolling bearings 20 is a first end 23 of the first stabilizer arm 21 and a second end 24 of the second stabilizer arm 22 rotatable relative to the housing 2 of the roll stabilizer 1 stored. One on the respective stabilizer arm 21 . 22 arranged ring 12 with a pin 13 fixes the rolling bearing 20 opposite the housing 2 , in particular a second housing part 120 , The stabilizer arms 21 . 22 are with sealing elements 130 sealed against the housing.

A detail of the first end 23 of the first stabilizer arm 21 is in the 2 shown. This illustration shows that the end 23 of the stabilizer arm 21 has an area with oval cross-section. The second end 24 of the second stabilizer arm 22 is identical to the first end 23 educated.

Another component of the roll stabilizer 1 is a coupling device 15 with which the stabilizer arms 21 . 22 optionally can be rigidly coupled. The coupling device 15 has a locking position and a release position, in which the coupling device 15 can be optionally offset. In the locking position are the first end 23 of the first stabilizer arm 21 and the second end 24 of the second stabilizer arm 22 rotatably connected to each other to a rigid state of the roll stabilizer 1 provide. In the release position are the first end 23 and the second end 24 rotatable relative to each other by a predetermined maximum angle to a soft state of the roll stabilizer 1 provide. The first end and the second end 23 . 24 are with a centering piece 30 axially centered.

The coupling device 15 has first jaws 41 on that the first end 23 in the in 3 set lock position shown and in the in 4 Release release position shown. The jaws 41 act in particular with the oval portion of the first end 23 together. Furthermore, the coupling device comprises 15 second jaws 42 that are identical to the first jaws 41 are formed and the second end 24 set in the locked position and released in the release position. As the illustration in 3 it can be seen, are the jaws 41 . 42 in the locking position of the coupling device 15 arranged in a clamping position in which the jaws 41 . 42 have a first distance from each other and at the end 23 . 24 rest against the stabilizer arm. In the in 4 illustrated release position of the coupling device 15 are the jaws 41 . 42 arranged in an open position in which the jaws 41 . 42 have a second distance from each other that is greater than the first distance. The second distance is a measure of the maximum angle to which the ends 23 . 24 the stabilizer arms 21 . 22 can be twisted against each other. The maximum angle is determined to be twice the angle α _max , around which the end of a stabilizer arm 21 . 22 opposite the jaws 41 . 42 can turn maximum. In the open position, the respective end can 23 . 24 of the stabilizer arm 21 . 22 opposite the jaws 41 . 42 Turn, allowing a lower stiffness of the roll stabilizer 2 is obtained. The first jaws 41 and second jaws 42 are each about spring elements 50 biased in the direction of its clamping position.

As further shown in FIG 1 can be removed, are the jaws 41 . 42 each on an inner contour of one of two coupling sockets 61 . 62 the coupling device 15 on, in an axial direction R of the roll stabilizer 1 is movably arranged. The inner contour of the coupling socket 61 . 62 is frustoconical, so that the distance of the first jaws 41 to each other or the distance of the second jaws 42 can be adjusted to each other by the respective coupling socket 61 . 62 , on whose inner contour the jaws 41 . 42 abuts, along the axial direction R is moved.

On their outer contour have the coupling bushes 61 . 62 In addition, an external thread, which engages with an internal thread of a relative to the housing 2 rotatable drive bush 70 stands. Here are first jaws 41 within a first coupling socket 61 arranged and the second jaws 42 within a second coupling socket 62 , The first coupling socket 61 has on its outer contour on a first external thread and the second coupling socket 62 has on its outer contour on a second external thread, wherein the first and the second external thread 61 . 62 have opposite directions of rotation. The coupling sockets 61 . 62 are concentric within the drive socket 70 arranged, which is rotatable relative to the housing 2 is arranged. For storage of the drive bush 70 the housing 2 has several rolling bearings 80 . 93 , in particular needle roller bearings. On the inner contour of this rotatable drive bush 70 are provided with two corresponding to the first external thread and the second external thread internal thread, which also have opposite directions of rotation. The drive bush 70 can by means of one outside the housing 2 provided designed as an electric motor motor 140 to be turned around. The electric motor 140 is on a flange 100 of the housing 2 arranged and drives a pinion 70 on that with the drive socket 91 , in particular with a toothing 72 the drive socket 91 , cooperates. By the electric motor 140 can the coupling sockets 61 . 62 therefore from the in 1 shown position in the axial direction R are moved outward. According to 1 have the outer end faces of the coupling sockets 61 . 62 a minimum distance Lmin from a symmetry axis S of the housing arranged perpendicular to the axial direction 2 on. By the electric motor 140 can the coupling sockets 61 . 62 be spent in a position in which the outer end faces of the coupling bushes 61 . 62 take a larger, in particular a maximum distance Lmax from this axis of symmetry S.

Are the coupling sockets 61 . 62 in the position with minimum distance Lmin from the symmetry axis S, so are the jaws 41 . 42 in the locked position 3 , The roll stabilizer 1 then has a maximum stiffness. Are the coupling sockets 61 . 62 on the other hand, moving outwardly so as to have a maximum distance Lmax from the symmetry axis S, the jaws are located 41 . 42 in the open position 4 , The roll stabilizer 1 then has a minimal stiffness. It is also possible, the coupling sockets 61 . 62 to position in a position between these two positions, leaving an intermediate position of the jaws 41 . 42 is realized, in which the roll stabilizer 1 obtains an average stiffness between the maximum and the minimum stiffness.

The inner and outer threads are preferred as self-locking thread, in particular Trapezoidal thread, trained, so that no additional measures must be taken to the coupling device 15 in the locking position, to hold the release position of an intermediate position.

The 5 shows a diagram of the roll stabilizer 2 adjacent rolling torque M above the rotation angle α for the locking position, intermediate position and the release position to illustrate the adjustable stiffness of the roll stabilizer. It can be seen that the roll stabilizer 1 can be set stiff (solid line a), can be set soft (knit-dotted line b) or may have an average stiffness, which has a rigidity between the aforementioned settings (dotted line c).

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

• WO 2005/056316 A1 [0002]

Claims (4)

A roll stabilizer (1) for a motor vehicle having a first stabilizer arm (21) and a second stabilizer arm (22) that can be torsionally stressed, and a coupling device (15) for coupling a first end (23) of the first stabilizer arm (21) a second end (24) of the second stabilizer arm (22), which is convertible from a locking position to a release position, wherein in the locked position, the first end (23) and the second end (24) are rotatably coupled together to a rigid behavior of Roll stabilizer (1) to obtain, and the first end (23) and the second end (24) in the release position against each other by a predetermined maximum angle are rotatable to provide a soft behavior of the roll stabilizer (1), characterized in that the coupling device ( 15) first jaws (41) which define the first end (23) of the first stabilizer arm (21) in the locking position and in the Fre release second and second jaws (42) which define the second end (24) of the second stabilizer arm (22) in the locked position and release in the release position. Device after Claim 1 , characterized in that the coupling device (15) can be transferred to an intermediate position, in which the first end (23) and the second end (24) is rotatable relative to each other by a predetermined intermediate angle, which is smaller than the maximum angle. Device according to one of the preceding claims, characterized in that the coupling device (15) by means of a motor (140), in particular an electric motor, the roll stabilizer (1) from the locking position into the release position and optionally in the intermediate position can be transferred. Device according to one of the preceding claims, characterized in that the clamping jaws (41, 42) in each case on an inner contour of a coupling bush (61, 62) of the coupling device (15) abut, in an axial direction (R) of the roll stabilizer (1) movable is arranged.

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