DE102017105095B4 - Switchable roll stabilizer for a motor vehicle - Google Patents

Abstract

Switchable roll stabilizer (1) for a motor vehicle, comprising a first stabilizer half (2a) with a first clutch body (3a) and a second stabilizer half (2b) with a second clutch body (3b), wherein the two clutch bodies (3a, 3b) by means of a stationary The switch device (4) is at least indirectly connected to a drive motor (5) and a pin lock unit (8 comprising at least one axially displaceable pin (10), characterized in that the coupling device (4) on the first stabilizer half (2a) stationary and rotatably arranged cam disc (7), wherein the drive motor (5) is provided to the cam (7) to twist, and wherein the at least one pin (10) on a at the end face de R cam plate (7) axially formed, ramp-shaped contact surface (9) comes axially to rest in order to connect in a locking position of the pin locking unit (8), the two coupling body (3a, 3b) form-fitting manner with each other.

Description

Switchable roll stabilizer for a motor vehicle, comprising a first stabilizer half with a first coupling body and a second stabilizer half with a second coupling body, wherein the two coupling bodies are positively connected to each other by means of a switchable coupling device.

Usually, each wheel axle of a motor vehicle on a roll stabilizer, which operates on the torsion bar principle. The roll stabilizer is arranged substantially parallel to the vehicle axle and connected at both ends via a respective coupling rod with the wheel suspension. Furthermore, the roll stabilizer is provided to stabilize the body structure against unwanted rolling movements about the longitudinal axis of the motor vehicle. Such rolling movements occur, for example, when cornering or off-road driving of the motor vehicle. The rolling motion of the motor vehicle is influenced by the roll stabilizer by the compression movement of the left and right wheel suspension of an axle is coupled together using the roll stabilizer. Thus, there is a copying effect between the compression movements of the two wheels on the axle.

From the DE 10 2007 040 736 B4 a stabilizer device for an axle of a motor vehicle is known. The stabilizer device comprises a roll stabilizer and an actuatable switchable coupling device. The roll stabilizer is formed in two parts in a left stabilizer half and in a right stabilizer half and the stabilizer halves are positively connected to each other by means of the coupling device. The coupling device comprises two claw devices which axially and radially cover one another and span at least one tangential gap angle, in each case connected to a stabilizer half and a locking sleeve which can be displaced axially back and forth between a locking position and an unlocking position. The locking sleeve has at least one in the locking position in the tangential gap between the jaw devices recordable locking fingers, with a displacement device for displacing the locking sleeve by means of mechanical power transmission. The displacement device has a servo-electric transmission drive. In case of failure of the electrical power supply of the servo-electric transmission drive the locking sleeve is automatically displaced by means of an energy storage in the locking position.

Out US 2008/0277891 A1 is a switchable roll stabilizer known according to the features of the preamble of claim 1, the two stabilizer halves can be positively locked together by means of a coupling device. This coupling device comprises pins 108 by means of helical compression springs 110 be pressed in a locking position. The pencils 110 can by means of an electromagnet 106 be charged. When electricity flows, the pins become under the force of the electromagnet 110 pulled out of its locking position and the two stabilizer halves are rotated in this unlocked position to each other.

US2013 / 0260941 A1 discloses a four-wheel drive vehicle that can be toggled between a four-wheel-drive mode and a two-wheel-drive mode by energizing an engine 29 is switched on or off

The object of the present invention is to provide a switchable roll stabilizer of a motor vehicle with an alternative coupling device, which is formed inexpensively and compact.

An inventive switchable roll stabilizer for a motor vehicle comprises a first stabilizer half with a first coupling body and a second stabilizer half with a second coupling body, wherein the two coupling bodies are positively connected to one another by means of a switchable coupling device arranged fixedly on the first stabilizer half, wherein the coupling device is at least indirectly a drive motor is connected and a stationary and rotatably mounted on the first stabilizer half cam, wherein the drive motor is provided to rotate the cam, wherein the coupling device further comprises a non-rotatably mounted on the first coupling body pin locking unit with at least one axially displaceable pin, the axially abutting on a ramp-shaped contact surface formed axially on the end face of the cam plate in order to engage in a locking mechanism Position of the pin locking unit to connect the two coupling body form-fitting with each other. Preferably, the pin locking unit has at least two axially displaceable pins.

In other words, the roll stabilizer is switchable between at least two states. In particular, a distinction is made between an open switching state and at least one closed switching state, wherein the roll stabilizer has an unlocking position in the open switching state and the locking position in the closed switching state. In the locking position is formed by the positive connection of the two coupling body, a torsional moment in the roll stabilizer, wherein the Torsion torque is dependent on the angle of rotation of the two coupling body to each other. The larger the twist angle, the higher the torsional moment and the stiffening degree of the chassis. During normal driving, a lesser degree of stiffening is set for a high level of driving comfort. In sporty, especially winding road a higher degree of stiffening for a higher adhesion to the road and better control of the motor vehicle is set. In particular, a sensor for measuring the transverse acceleration is provided in order in dependence on the transverse acceleration of the motor vehicle in the unlocking position, the chassis of the motor vehicle can be maximally entangled without a torsional moment arises in the roll stabilizer. This allows improved off-road capability of the motor vehicle. The vehicle speed is preferably limited to 20 km / h in the unlocked position. For example, a switch for initiating the unlocking position can be provided for improved off-road capability of the motor vehicle. Advantageously, the degree of stiffening can be adjusted via a steering angle of the wheels of the motor vehicle, via a steering angle speed and / or via a transverse acceleration.

The starting position of the roll stabilizer is in the locked position. The coupling device is not driven by the drive motor in the locking position. Preferably, the drive motor is designed as an electric motor. Particularly advantageous is the energy-saving use of the drive motor, since energy is consumed only in an active unlocking of the locking position in the unlocked position. An indirect connection means that at least one further element in the power flow is arranged between the drive motor and the coupling device. Thus, the drive motor and the coupling device are operatively connected to each other.

Under the axially formed, ramp-shaped contact surface of the cam is to be understood that the cam plate has a plateau for the locking position and a ramp and a plateau for the unlocked position. Thus, the ramp is to be understood as a work area in which the pins of the pin locking unit is axially displaced by the rotation of the cam and switched between the locked position and unlocked position.

The invention includes the technical teaching that the respective pins of the pin locking unit have a circumferential collar, on the first axial bearing surface against a housing supporting spring comes to rest, which is provided to the federal government by a spring bias axially against an axially displaceable To press driver, the driver is axially abutting the ramp-shaped contact surface of the cam, and wherein the pins are axially displaceable upon rotation of the cam against the spring from the locking position to an unlocking position of the pin locking unit. In other words, the driver slides on rotation of the cam over the contact surface of the cam. The spring is formed as a compression spring and provided to bias the respective pins in order to prevent axial play between the pin locking unit and the axially formed, ramp-shaped contact surface of the cam. Thus, the compression springs serve as energy storage.

Preferably, the pin locking unit comprises four pins, wherein the pins are at least partially received and axially guided in the unlocked position by a respective bore in the first coupling body. The holes extend axially through the first coupling body, wherein the number of holes is identical to the number of pins. Thus, four holes in the first coupling body are provided for four pins, wherein the radial distance between the respective holes and the pins to the axis of rotation of the coupling device is the same. Other embodiments are also conceivable.

Preferably, the housing limits the pin locking unit in the radial and axial directions. The housing is connected to the first coupling body. Preferably, the housing is attached to the peripheral surface of the first coupling body.

Furthermore, preferably, the second coupling body on the front side to the present four circumferentially distributed holes, which are provided to at least partially receive pins of the pin locking unit in a locking position. In this case, lock in the locked position at any time, all four pins simultaneously. Preferably always only two pins fall into the holes of the second coupling body. The holes are preferably formed as elongated holes. It is also conceivable that the second coupling body has at least one bore on the end face. In a preferred embodiment, a multiplicity of slot bores are distributed circumferentially on the end face of the second clutch body. In particular, a nearly continuous locking is made possible with a single locking position. The radial distance of the holes in the first and second coupling body to the axis of rotation of the two stabilizer halves is identical. In other words, the holes of the first coupling body are aligned with the holes of the second coupling body.

Further preferably, the holes and the incident in the respective bores ends of the pins are provided with a circumferential slope. The angle of the slope is preferably 6 °, wherein the formation of the bevels on the holes and the ends of the pins ensures a secure collapse of the pins in the holes and also ensures the backlash of the system.

According to a preferred embodiment, the number of holes is not integer divisible by the number of pins. It is advantageous that thereby always only two pins are incident in the holes of the second coupling body.

Preferably, the coupling device comprises a gear unit. Thus, this allows a compact design of the drive motor or the use of a drive motor with lower power. The gear unit is preferably designed as a worm gear or spur gear.

Further preferably, the position of the cam can be measured by means of an angle sensor. The angle sensor is provided to determine the position of the roll stabilizer, wherein the drive motor is preferably controlled via stops provided for this purpose. Alternatively or additionally, the position of the two stabilizer halves is measured via an angle sensor.

• 1 eine schematische Ansicht eines erfindungsgemäßen Wankstabilisators,
• 2 eine vereinfachte schematische Längsschnittdarstellung zur Veranschaulichung einer Verriegelungsposition des erfindungsgemäßen Wankstabilisators,
• 3 eine vereinfachte schematische Längsschnittdarstellung zur Veranschaulichung einer Entriegelungsposition des erfindungsgemäßen Wankstabilisators,
• 4 eine schematische Detailschnittdarstellung zur Veranschaulichung des Aufbaus einer Kupplungsvorrichtung des erfindungsgemäßen Wankstabilisators,
• 5 eine schematische Perspektivdarstellung zur Veranschaulichung des Aufbaus der Kupplungsvorrichtung des erfindungsgemäßen Wankstabilisators,
• 6 eine schematische Querschnittdarstellung zur Veranschaulichung des Aufbaus eines Kupplungskörpers der Kupplungsvorrichtung, und
• 7 eine vereinfachte schematische Schnittdarstellung zur Veranschaulichung der Funktionsweise einer Stiftverriegelungseinheit der Kupplungsvorrichtung.

Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to the seven figures, wherein the same or similar elements are provided with the same reference numerals. Show it

• 1 a schematic view of a roll stabilizer according to the invention,
• 2 a simplified schematic longitudinal sectional view illustrating a locking position of the roll stabilizer according to the invention,
• 3 a simplified schematic longitudinal sectional view illustrating an unlocking position of the roll stabilizer according to the invention,
• 4 a schematic detail sectional view illustrating the construction of a coupling device of the roll stabilizer according to the invention,
• 5 a schematic perspective view illustrating the structure of the coupling device of the roll stabilizer according to the invention,
• 6 a schematic cross-sectional view illustrating the structure of a coupling body of the coupling device, and
• 7 a simplified schematic sectional view illustrating the operation of a pin locking unit of the coupling device.

According to 1 includes a switchable roll stabilizer 1 for a - not shown here - motor vehicle a first stabilizer half 2a and a second stabilizer half 2 B , which are positively connected with each other. The switchable roll stabilizer 1 is arranged transversely to the vehicle longitudinal axis and connected at its free ends to - not shown here - wheels or wheel carrier.

After the 2 and 3 is the first stabilizer half 2a rotatably with a first coupling body 3a and the second stabilizer half 2 B rotatably with a second coupling body 3b connected. The first stabilizer half 2a is partially from the second coupling body 3b accommodated, wherein the second coupling body 3b rotatable by means of a bearing element 18 on the first stabilizer half 2a is stored. One stationary on the first stabilizer half 2a arranged, switchable coupling device 4 is through a gear unit 6 with a drive motor 5 connected, with a cam 7 fixed in place and by means of two bearing elements 18 rotatable on the first stabilizer half 2a is stored. A - not shown here - drive shaft of the transmission unit 6 is non-rotatable with the drive motor 5 connected and a - not shown here - output shaft of the transmission unit 6 is non-rotatable with the first stabilizer half 2a connected. The drive motor 5 is designed as an electric motor and when energized to the cam 7 to twist. The coupling device 4 further comprises a pin lock unit disposed non-rotatably on the first clutch body 3a 8th attached to one on the face of the cam 7 axially formed, ramp-shaped contact surface 9 comes axially to the plant. The pin lock unit 8th includes four axially movable pins 10 which are intended to be in a locking position of the pin locking unit 8th the two coupling bodies 3a . 3b positively connect with each other.

To 2 is the coupling device 4 in a locked position. The locking position represents the initial state of the roll stabilizer 1 in which the drive motor 5 not being supplied with energy. The two coupling bodies 3a . 3b are by means of the coupling device 4 positively connected with each other. The pencils 10 are through respective holes 15 in the first coupling body 3a taken up and guided axially, wherein the second coupling body 3b on the front side circumferentially distributed holes 16 which are intended to the four pins 10 the pin locking unit 8th partially in a locked position. Due to the sectional view is only one of the four pins 10 visible, noticeable. A perspective view of the four pins 10 in the pin lock unit 8th is 5 refer to. In the locking position is created by the positive connection of the two coupling body a torsional moment in the roll stabilizer.

In 3 is the coupling device 4 in an unlocked position. The unlocked position is adjusted by the drive motor 5 the coupling device 4 drives, with the cam 7 is set in a rotational movement. The at the axially formed, ramp-shaped contact surface 9 the cam 7 axially coming to the plant pins 10 the pin locking unit 8th be moved axially, with the positive connection between the coupling bodies 3a . 3b is solved. In the unlocked position, the chassis of the motor vehicle can be entangled maximally, without creating a torsional moment in the roll stabilizer. The pencils 10 are in the unlocked position through the respective holes 15 in the first coupling body 3a partially received and guided axially.

4 shows the rotationally fixed to the first coupling body 3a trained pin locking unit 8th in an unlocked position, with the respective pins 10 the pin locking unit 8th a wraparound collar 11 have, at the first axial abutment surface against a housing 13 supporting spring 12 comes to the plant. The feather 12 is meant to be the federal government 11 by a spring bias axially against an axially displaceable driver 14 to press, taking the driver 14 at the ramp-shaped contact surface 9 the cam 7 comes axially to the plant, and where the pins 10 at rotation of the cam 7 against the spring 11 from the locking position to the unlocking position of the pin locking unit 8th are axially displaceable. The housing 13 limits the pin lock unit 8th in the radial and axial directions, the housing 13 on the peripheral surface of the first coupling body 3a is attached. The holes 16 as well as in the respective holes 16 incident ends of the pins 10 are present with a circumferential slope 17 Mistake. Further, the cam plate 7 in the present case an angle sensor 19 , which measures the position of the cam 7 , in particular for measuring the position of the stabilizer halves 2a . 2 B is provided on.

5 shows the arrangement of the coupling device 4 as well as the four pens 10 the pin locking unit 8th on the first coupling body 3a , The pencils 10 are at a radial distance from the axis of rotation of the stabilizer halves 2a . 2 B arranged circumferentially, with the fret 11 of the pens 10 by the spring preload of the respective spring 12 axially against the driver 14 is pressed. The driver 14 slides when the cam is rotated 7 along the axially formed, ramp-shaped contact surface 9 ,

According to 6 has the second coupling body 3b on the face present eleven evenly distributed and trained as long holes drill holes 16 on. The holes 16 are by footbridges 20 formed spaced from each other. The number of holes 16 is not integer by the number of pens 10 divisible. It is advantageous that thereby when locking the two coupling body 3a . 3b two pins each 10 in the respective holes 16 come to mind.

After the in 7 shown operation of the pin lock falls when locking the two coupling body 3a . 3b first a first pencil 10 into a hole 16 one. By further rotation of the first coupling body 3a relative to the second coupling body 3b comes the previously sunken first pin 10 on the bridge adjacent in the direction of rotation 20 to the plant. At the same time a second pin falls 10 in another hole 16 a, whereby the two coupling bodies 3a . 3b are locked in both directions of rotation. Consequently, there is a two-sided locking of the two coupling body 3a . 3b ,

LIST OF REFERENCE NUMBERS

1

roll stabilizer

2a, 2b

stabilizer half

3a, 3b

clutch body

4

coupling device

5

drive motor

6

gear unit

7

cam

8th

Pin locking unit

9

contact surface

10

pen

11

Federation

12

feather

13

casing

14

takeaway

15

drilling

16

drilling

17

slope

18

bearing element

19

angle sensor

20

web

Claims (10)

Switchable roll stabilizer (1) for a motor vehicle, comprising a first stabilizer half (2a) with a first clutch body (3a) and a second stabilizer half (2b) with a second clutch body (3b), wherein the two clutch bodies (3a, 3b) by means of a stationary The switch device (4) is at least indirectly connected to a drive motor (5) and a pin lock unit (8 comprising at least one axially displaceable pin (10), characterized in that the coupling device (4) on the first stabilizer half (2a) stationary and rotatably arranged cam disc (7), wherein the drive motor (5) is provided to the cam (7) to twist, and wherein the at least one pin (10) on one of the end face d he cam plate (7) axially formed, ramp-shaped contact surface (9) comes axially to the plant, in a locking position of the pin locking unit (8), the two coupling body (3a, 3b) to positively connect with each other. Switchable roll stabilizer (1) according to Claim 1 , characterized in that the respective pins (10) of the pin locking unit (8) have a circumferential collar (11), on the first axial bearing surface against a housing (13) supporting spring (12) comes to rest, which is provided , the collar (11) by a spring bias axially against an axially displaceable driver (14) to press, wherein the driver (14) on the ramp-shaped contact surface (9) of the cam (7) comes axially to the plant, and wherein the at least one pin (10) upon rotation of the cam disc (7) against the spring (11) from the locking position into an unlocking position of the pin locking unit (8) are axially displaceable. Switchable roll stabilizer (1) according to Claim 2 , characterized in that the housing (13) limits the pin locking unit (8) in the radial and axial directions. Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the pin locking unit (8) comprises four pins (10), wherein the pins (10) in the unlocked position by a respective bore (15) in the first coupling body (3a) at least partially absorbed and guided axially. Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the second coupling body (3b) on the front side circumferentially distributed bores (16), which are provided, pins (10) of the pin locking unit (8) in a locking position, at least partially record. Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the bores (16) and the ends of the pins (10) which are incident into the respective bores (16) are provided with a peripheral bevel (17). Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the number of holes (16) is not integer by the number of pins (10) is divisible. Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the coupling device (4) comprises a gear unit (6). Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the position of the cam disc (7) by means of angle sensor (19) is measurable. Switchable roll stabilizer (1) according to one of the preceding claims, characterized in that the bores (16) are formed as oblong holes.

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