ACTIVE ROLL STABILIZER

Abstract

An active roll stabilizer includes a divided torsion bar (1) having torsion bar parts (2, 3) which are arranged one behind the other along a torsion bar axis. An actuator (4) for transmitting torsional torques to the torsion bar (1) is provided. An electric motor (7) and a transmission (6) connected to the electric motor (7) are arranged in an actuator housing (5). The actuator housing (5) is connected to the one torsion bar part (2) for conjoint rotation and the transmission (6) is connected, on the output side, to the other torsion bar part (3) for conjoint rotation. A motor housing (11) of the electric motor (7) is connected, by means of only one of the two axial ends of said motor housing, to the actuator housing (5) for conjoint rotation.

Claims

1. An active roll stabilizer, having a divided torsion bar with two torsion bar parts arranged one behind the other along a torsion bar axis, an actuator for applying torque to the torsion bar parts, the actuator having an electric motor and a transmission connected to the electric motor arranged within an actuator housing, the actuator housing being connected to one of the two torsion bar parts for conjoint rotation and the transmission being connected, on an output side, to another of the two torsion bar parts for conjoint rotation, wherein a motor housing of the electric motor is connected at only a first of two axial ends to the actuator housing for conjoint rotation.

2. The active roll stabilizer according to claim 1, wherein a clearance fit is provided between a second of the two axial ends of the motor housing and the actuator housing.

3. The active roll stabilizer according to claim 1, wherein the motor housing has a hollow sleeve and two bearing shields, one bearing shield arranged at each axial end of the sleeve.

4. The active roll stabilizer according to claim 3, wherein one of the bearing shields faces the transmission and has a bushing for a motor shaft of the electric motor and the other bearing shield faces away from the transmission and has a rotor position sensor.

5. The active roll stabilizer according to claim 3, wherein one of the bearing shields has an annular shoulder which is arranged with the actuator housing for conjoint rotation.

6. The active roll stabilizer according to claim 4, wherein the other bearing shield has an annular shoulder which is supported with play on the actuator housing.

7. The active roll stabilizer according to claim 4, wherein the other bearing shield engages with play on a ring gear of the transmission.

8. The active roll stabilizer according to claim 3, wherein an annular gap is formed between the sleeve and the actuator housing.

9. The active roll stabilizer according to claim 3, wherein one of the bearing shields has an annular shoulder which is arranged with a ring gear connected to the actuator housing for conjoint rotation.

10. An active roll stabilizer comprising: a first torsion bar part; a second torsion bar part; an actuator housing connected to conjoint rotation with the first torsion bar part; an electric motor having a motor housing with a hollow sleeve, a first end of the sleeve connected to the actuator housing for conjoint rotation, a second end of the hollow sleeve not connected for conjoint rotation with the actuator housing; a transmission having an input connected for conjoint rotation to a rotor of the electric motor and having an output connected for conjoint rotation to the second torsion bar part.

11. The active roll stabilizer according to claim 10, further comprising: a first bearing shields arranged at the first axial end of the sleeve; and a second bearing shield arranged at the second axial end of the sleeve.

12. The active roll stabilizer according to claim 11, wherein the second bearing shield faces the transmission and has a bushing for a rotor shaft of the electric motor and the first bearing shield faces away from the transmission and has a rotor position sensor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The roll stabilizer is explained in more detail below with reference to exemplary embodiments shown in two figures. In the figures:

[0017] FIG. 1 shows an active roll stabilizer in a perspective representation, and

[0018] FIG. 2 shows an enlarged detail of the roll stabilizer according to FIG. 1 in longitudinal section.

DETAILED DESCRIPTION

[0019] The active roll stabilizer is provided with a divided torsion bar 1, between which torsion bar parts 2, 3, arranged one behind the other along a torsion bar axis, an actuator 4 is effectively arranged. The actuator 4 is provided for the transmission of torsional moments to the torsion bar 1.

[0020] A transmission 6 (only suggested) and an electric motor 7 are arranged in the actuator housing 5. The actuator housing 5 is connected to the one torsion bar part 2 for conjoint rotation. An output shaft 8 of the transmission 6, which is designed in particular as a planetary transmission 9, is connected to the other torsion bar part 3 for conjoint rotation. The motor shaft 10 of the electric motor 7 transfers the motor torque to the input shaft of the transmission 6. The motor shaft 10 can at the same time form the input shaft of the transmission 6.

[0021] The motor housing 11 has a hollow cylindrical sleeve 12 which, in the exemplary embodiment, is arranged coaxially with the hollow cylindrical actuator housing 5. A bearing shield 13, 14 is attached to each of the two axial ends of the sleeve 12, on which the motor shaft 10—i.e., the rotor—is rotatably mounted. An annular gap 17 is formed between the sleeve 12 and the actuator housing 5.

[0022] The bearing shield 13 is arranged on the side facing away from the transmission 6. This bearing shield 13 has an annular shoulder 15 projecting radially outward. The shoulder 15 of the bearing shield 13 is connected to the actuator housing 5 for conjoint rotation by means of a press fit. Alternatively or additionally, the bearing shield 13 can be connected to the actuator housing 5 in a form-fitting manner or firmly bonded therewith in order to transmit the motor torque.

[0023] The bearing shield 14 is arranged on the side facing the transmission 6. This bearing shield 14 has an annular shoulder 16 projecting radially inward. The shoulder 16 of the bearing shield 14 is mounted with a clearance fit on a ring gear 18 of the planetary transmission 9 that is connected to the actuator housing 5 for conjoint rotation.

[0024] The motor housing 11 of the electric motor 7 is consequently connected to the actuator housing 5 for conjoint rotation only by means of the bearing shield 13. The motor housing 11 consequently only absorbs the torque of the motor shaft 10. A rotor position sensor (not shown here) is supported on the bearing shield 13 and detects the rotor position of the rotor of the electric motor 7. The absence of a system load in the motor housing 11 ensures that the rotational position of the rotor or the motor shaft 10 is correctly determined and that torsion of the actuator housing 11 does not affect the measurement result.

LIST OF REFERENCE SYMBOLS

[0025] 1 Torsion bar [0026] 2 Torsion bar part [0027] 3 Torsion bar part [0028] 4 Actuator [0029] 5 Actuator housing [0030] 6 Transmission [0031] 7 Electric motor [0032] 8 Output shaft [0033] 9 Planetary transmissions [0034] 10 Motor shaft [0035] 11 Motor housing [0036] 12 Sleeve [0037] 13 Bearing shield [0038] 14 Bearing shield [0039] 15 Shoulder [0040] 16 Shoulder [0041] 17 Gap [0042] 18 Ring gear