ELECTROMECHANICALLY DRIVABLE BRAKE PRESSURE GENERATOR

Abstract

An electromechanically drivable brake pressure generator for a hydraulic brake system of a vehicle. The brake pressure generator including a spindle drive unit for converting a rotary movement on the drive side into a translational movement for the purpose of actuating a piston of a hydraulic piston-and-cylinder unit. A gear unit is arranged between the spindle drive unit and an electric drive motor. A drive motor axis and an axis of the spindle drive unit are arranged radially offset from one another. The piston-and-cylinder unit and the electric drive motor are arranged on axially opposite sides of the gear unit.

Claims

1-9. (canceled)

10. An electromechanically drivable brake pressure generator for a hydraulic brake system of a vehicle, comprising: a spindle drive unit configured to convert a rotary movement on a drive side into a translational movement to actuate a piston of a hydraulic piston-and-cylinder unit; and a gear unit arranged between the spindle drive unit and an electric drive motor; wherein a drive motor axis and an axis of the spindle drive unit are arranged radially offset from one another, and the piston-and-cylinder unit and the electric drive motor are arranged on axially opposite sides of the gear unit.

11. The electromechanically drivable brake pressure generator as recited in claim 10, wherein the gear unit includes a planetary gear which is arranged coaxially in relation to the drive motor axis.

12. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the planetary gear includes a ring gear on an output side, and the ring gear cooperates with a spur gear that drives a spindle of the spindle drive unit.

13. The electromechanically drivable brake pressure generator as recited in claim 11, wherein planet wheels of the planetary gear are configured as stepped planets.

14. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the planetary gear is configured to have two stages.

15. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the piston-and-cylinder unit is received in a valve housing opposite which the electric drive motor is mounted.

16. The electromechanically drivable brake pressure generator as recited in claim 15, wherein the electric drive motor includes a motor housing which is secured to the valve housing and on which a planet carrier is secured such that it cannot rotate in relation thereto.

17. The electromechanically drivable brake pressure generator as recited in claim 15, wherein a motor shaft of the electric drive motor extends into the valve housing, in which a speed sensor is arranged at an opposite axial end to the electric drive motor.

18. A vehicle, comprising: an electromechanical brake pressure generator for a hydraulic brake system, the electromechanical brake pressure generator including: a spindle drive unit configured to convert a rotary movement on a drive side into a translational movement to actuate a piston of a hydraulic piston-and-cylinder unit, and a gear unit arranged between the spindle drive unit and an electric drive motor, wherein a drive motor axis and an axis of the spindle drive unit are arranged radially offset from one another, and the piston-and-cylinder unit and the electric drive motor are arranged on axially opposite sides of the gear unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 shows a schematic illustration of an exemplary embodiment of a drive train of an electromechanical brake pressure generator in accordance with the present invention.

[0021] FIG. 2 shows a sectional view of an exemplary embodiment of a drive train of an electromechanical brake pressure generator in accordance with the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0022] FIG. 1 shows a schematic illustration of an exemplary embodiment of a drive train 14 of an electromechanical brake pressure generator in accordance with the present invention. Drive train 14 comprises an electric drive motor 18, with the aid of which a rotary movement a may be generated. Electric drive motor 18 is mechanically connected to a gear unit 22. In this exemplary embodiment, this gear unit 22 is a planetary gear. Planetary gear 22 is positioned coaxially in relation to a drive motor axis 26, and is arranged on a valve housing 28 of the brake pressure generator.

[0023] The drive speed of electric drive motor 18 is converted to a slower speed with the aid of planetary gear 22. On an output side, planetary gear 22 is mechanically connected to a hydraulic module 30. Hydraulic module 30 features a piston-and-cylinder unit 34 which, with the aid of an axial translational movement b of a spindle drive unit 38, generates a brake pressure. The drive train 14 that is illustrated in this exemplary embodiment has a biaxial arrangement. This means that an axis 42 of spindle drive unit 38 of hydraulic module 30 is arranged parallel to, and radially offset from, drive motor axis 26.

[0024] In this case, electric drive motor 18 is not arranged in valve housing 28 but abuts externally against planetary gear 22. Electric drive motor 18 and piston-and-cylinder unit 34, which is arranged in valve housing 28, are thus positioned on axially opposite sides of gear unit 22. This saves on the space for receiving electric drive motor 18, in valve housing 28, with the result that valve housing 28 can be of smaller configuration.

[0025] FIG. 2 shows a sectional view of an exemplary embodiment of a drive train 14 of an electromechanical brake pressure generator in accordance with the present invention. In this figure, the drive train 14 that is shown in FIG. 1 is illustrated in more detail. In this exemplary embodiment, hydraulic module 30, electric drive motor 18, and planetary gear 22 are arranged in a common external housing 46, which is connected to valve housing 28 with the aid of securing devices 50. Within this external housing 46, electric drive motor 18 is additionally also arranged in a separate motor housing 54, which is likewise connected to valve housing 28.

[0026] Electric drive motor 18 features a motor shaft 58 that is mounted relative to motor housing 54 with the aid of bearings 62. Arranged on motor shaft 58 is a sun wheel 66 of planetary gear 22, which is driven by electric drive motor 18. Sun wheel 66 cooperates with planet wheels 70, which are configured to rotate with the aid of a planet carrier 72 secured to motor housing 54.

[0027] In this exemplary embodiment, planet wheels 70 are configured as stepped planets. This means that planet wheels 70 have a larger diameter in a region of engagement with sun wheel 66 than in a region of engagement with a ring gear 74. In this case, ring gear 74 is mounted to be able to rotate in relation to valve housing 28. Motor shaft 58 is prolonged by planetary gear 22 to extend into valve housing 28. At an opposite axial end of motor shaft 58 to electric drive motor 18, a speed sensor 78 is arranged in valve housing 28 and detects the speed of motor shaft 58. In this exemplary embodiment, the speed is detected with the aid of a magnetic element 80 at the axial end of motor shaft 58.

[0028] Ring gear 74 features an external set of teeth, with the aid of which ring gear 74 cooperates with a spur gear 82 of spindle drive unit 38 such that spur gear 82 is rotated. In this arrangement, spindle drive unit 38 comprises a spindle 86, which is held such that it can rotate in a spindle drive receptacle 90 that is fixedly connected to valve housing 28. Additionally received in spindle drive receptacle 90 is a spindle nut 94 that engages with spindle 86 such that spindle nut 94 is axially displaceable as spindle 86 rotates.

[0029] Spur gear 82 is fixedly connected to a cup-shaped structural element 98 which is mounted such that it can rotate in relation to spindle drive receptacle 90. In addition, structural element 98 is fixedly connected to an end of spindle 86 such that spindle 86 is rotated with the aid of structural element 98, together with spur gear 82.