ELECTROMECHANICAL BRAKE PRESSURE GENERATOR FOR A HYDRAULIC BRAKE SYSTEM OF A VEHICLE

Abstract

An electromechanical brake pressure generator for a hydraulic braking system of a vehicle. The brake pressure generator has a spindle drive unit for converting an input-drive-side rotational motion into a translational motion for piston actuation of a hydraulic piston/cylinder unit. A multi-stage gear linkage is disposed between the spindle drive unit and an electric drive motor. The gear linkage encompasses a planetary gearset unit driven by a motor pinion constituting a sun gear, the output-drive-side ring gear of which unit drives the spindle drive unit. A motor shaft of the electric drive motor extends in adjacently parallel fashion next to a spindle drive shaft of the spindle drive unit.

Claims

1-10. (canceled)

11. An electromechanical brake pressure generator for a hydraulic braking system of a vehicle, comprising: a spindle drive unit configured to convert an input-drive-side rotational motion into a translational motion for piston actuation of a hydraulic piston/cylinder unit; a multi-stage gear linkage disposed between the spindle drive unit and an electric drive motor, the gear linkage encompassing a planetary gearset unit driven by a motor pinion constituting a sun gear, an output-drive-side ring gear of the planetary gearset unit configured to drive the spindle drive unit; and a motor shaft of the electric drive motor which extend in adjacently parallel fashion next to a spindle drive shaft of the spindle drive unit.

12. The electromechanical brake pressure generator as recited in claim 11, wherein the gear linkage is disposed on a first end face of the drive motor and spindle drive unit.

13. The electromechanical brake pressure generator as recited in claim 12, wherein an electronic control unit has electrical terminals for a sensor configured to detect a motor rotation speed in a region of the motor shaft and for the drive motor, the electronic control unit being disposed on a second end face, located oppositely from the first end face, of the drive motor and spindle drive unit.

14. The electromechanical brake pressure generator as recited in claim 11, wherein the gear linkage has an intermediate stepped gear whose larger gear meshes with an externally toothed ring gear of the planetary gearset unit, and whose motor pinion meshes with a spindle gear of the spindle drive unit.

15. The electromechanical brake pressure generator as recited in claim 11, wherein the electric drive motor is accommodated in a cup-shaped motor housing.

16. The electromechanical brake pressure generator as recited in claim 15, wherein the ring gear of the planetary gearset unit is mounted in rolling bearings on a bottom region of the cup-shaped motor housing.

17. The electromechanical brake pressure generator as recited in claim 15, wherein planet gears of the planetary gearset unit are disposed on a planet carrier attached to a bottom region of the cup-shaped motor housing.

18. The electromechanical brake pressure generator as recited in claim 15, wherein the cup-shaped motor housing comes into abutment with an edge region against a device housing that is of cuboidal basic geometry.

19. The electromechanical brake pressure generator as recited in claim 14, wherein the spindle drive unit encompasses a spindle nut and a spindle in threaded engagement with the spindle nut, the spindle nut or the spindle being drivable via the spindle gear, fastened coaxially to it, of the gear linkage so that a rotational motion of the spindle nut or of the spindle produces, under an influence of a torque brace, a translational motion respectively of the spindle or of the spindle nut.

20. A vehicle, comprising: an electromagnetic brake pressure generator for a hydraulic braking system, the electromagnetic brake pressure generator including: a spindle drive unit configured to convert an input-drive-side rotational motion into a translational motion for piston actuation of a hydraulic piston/cylinder unit; a multi-stage gear linkage disposed between the spindle drive unit and an electric drive motor, the gear linkage encompassing a planetary gearset unit driven by a motor pinion constituting a sun gear, an output-drive-side ring gear of the planetary gearset unit configured to drive the spindle drive unit; and a motor shaft of the electric drive motor extending in adjacently parallel fashion next to a spindle drive shaft of the spindle drive unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further features that improve the present invention will be depicted below in further detail, together with the description of a preferred exemplifying embodiment of the present invention with reference to Figures.

[0020] FIG. 1 is a schematic longitudinal section through an electromechanical braking force generator in accordance with an example embodiment of the present invention.

[0021] FIG. 2 is a perspective view of the brake pressure generator of FIG. 1 in a design embodiment, with a cover part opened.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0022] In accordance with FIG. 1, the electromechanical brake pressure generator for a hydraulic braking system (not depicted here in further detail) of a vehicle encompasses a spindle drive unit 1 by which a rotational motion a, generated on the input drive side by an electric drive motor 2, is converted into a translational motion b for piston actuation of a hydraulic piston/cylinder unit 3.

[0023] Located in the power flow between electric drive motor 2 and spindle drive unit 1 is a multi-stage gear linkage 4 that provides conversion of a rapid motor rotation speed of electric drive motor 2 down to a rotation speed that is slower in comparison, for driving spindle drive unit 1. Gear linkage 4 is disposed on a first end face 5, serving as a mechanical connection side, of drive motor 2 and spindle drive unit 1.

[0024] Second end face 6 located oppositely from first end face 5 serves, conversely, as an electrical connection side. Disposed on this second end face 6 is an electronic control unit 7 for applying control to electric drive motor 2 in accordance with a required braking force assistance, which is ascertained in a conventional manner. Also arranged in the region of that end of a motor shaft 8 which is located oppositely from gear linkage 4, in conjunction with electronic control unit 7, is a sensor 9 that directly detects the motor rotation speed of electric drive motor 2 and conveys it a short distance to electronic control unit 7 for regulation purposes.

[0025] In the electromechanical brake pressure generator, motor shaft 8 of electric drive motor 2 extends in adjacently parallel fashion next to a spindle drive shaft 10 of spindle drive unit 1. A planetary gearset unit 12, which is driven by a motor pinion 11 constituting a sun gear and is disposed coaxially with respect to electric drive motor 2, and whose output-drive-side ring gear 13 drives spindle drive unit 1, is provided in order to transfer drive power in the context of gear linkage 4. Several planet gears 14 (by way of example) of planet gearset unit 12 are mounted rotatably on a common planet carrier 15 that is attached in stationary fashion to the electromechanical brake pressure generator.

[0026] In this exemplifying embodiment, spindle drive unit 1 encompasses an externally located spindle nut 16 and a spindle 17 that is in direct threaded engagement therewith. Spindle nut 16 is drivable via a spindle gear 18, fastened coaxially thereon, of gear linkage 4, so that the rotational motion of spindle nut 16 produces, in a conventional manner, a translational motion of spindle 17 for actuation of hydraulic brake cylinder unit 3.

[0027] FIG. 2 illustrates in detail, with cover part 20 opened (and therefore not depicted here), the interaction of the components of gear linkage 4.

[0028] The components of gear linkage 4 include an intermediate stepped gear 19 whose larger gear 20 meshes with the externally toothed ring gear 13 of planetary gearset 12. A pinion (concealed here by large gear 20) of intermediate stepped gear 19 meshes on the output drive side with spindle gear 18 of spindle drive unit 1.

[0029] The electric drive motor (not visible in this perspective exterior view) is accommodated within a cup-shaped motor housing 21 whose bottom region also carries planetary gearset unit 12. The cup-shaped motor housing comes into abutment against a device housing 22 that is of cuboidal basic geometry. Located on the opposite side surface is a further housing part 23 for accommodation of electronic control unit 7 (not further evident here). Projecting into the substantially cuboidal device housing 22, which in this exemplifying embodiment is made of a lightweight alloy, is an input rod 24 for attachment of a brake pedal (not depicted in further detail here) that serves in conventional fashion to transfer a manual braking input.

[0030] The present invention is not limited to the preferred exemplifying embodiment described above. Variations thereof are instead also possible. For example, it is also possible to impart a different geometric conformation to the individual housing parts and components, provided the disposition concept, which contains a parallel adjacent disposition of the motor shaft and spindle drive shaft which are coupled to one another according to the present invention via the special gear linkage, is retained.