ELECTROMECHANICALLY DRIVABLE BRAKE PRESSURE GENERATOR

Abstract

An electromechanically drivable brake pressure generator for a hydraulic braking system of a vehicle. The electromechanically drivable brake pressure generator includes an electric motor for generating a input speed, a planetary gear set that is driven by the electric motor on the input side to decrease a gear ratio of the input speed, and a hydraulic module that is connected to the planetary gear set on the output side to generate a brake pressure. The planetary gear set includes stepped planets that are connected to a sun wheel of the planetary gear set on the input side and to an output component of the planetary gear set on the output side.

Claims

10. 1-10. (canceled)

11. An electromechanically drivable brake pressure generator for a hydraulic braking system of a vehicle, comprising: an electric motor configured to generate an input speed, a planetary gear set driven by the electric motor on an input side to decrease a gear ratio of the input speed; and a hydraulic module connected to the planetary gear set on an output side to generate a brake pressure; wherein the planetary gear set includes stepped planets that are connected to a sun wheel of the planetary gear set on the input side and to an output component of the planetary gear set on the output side.

12. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the output component is a planet carrier that accommodates the stepped planets.

13. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the output component is an annulus gear of the planetary gear set.

14. The electromechanically drivable brake pressure generator as recited in claim 12, wherein the stepped planets have a bearing area via which they are mounted in bores of the planet carrier.

15. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the stepped planets are mounted via planet axles at the electric motor or at a housing part.

16. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the output component is mounted via a bearing that is situated between a housing part and the output component.

17. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the output component is a spur wheel.

18. The electromechanically drivable brake pressure generator as recited in claim 11, wherein the stepped planets and/or the sun wheel are formed from a sintered metal material.

19. The electromechanically drivable brake pressure generator as recited in claim 13, wherein the stepped planets and/or a planet carrier and/or the annulus gear are formed from a plastic injection-molded material.

20. A vehicle, comprising: an electromechanically drivable brake pressure generator for a hydraulic braking system of the vehicle, including: an electric motor configured to generate an input speed, a planetary gear set driven by the electric motor on an input side to decrease a gear ratio of the input speed; and a hydraulic module connected to the planetary gear set on an output side to generate a brake pressure; wherein the planetary gear set includes stepped planets that are connected to a sun wheel of the planetary gear set on the input side and to an output component of the planetary gear set on the output side.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 shows a schematic illustration of one exemplary embodiment of a drive train of the electromechanical brake pressure generator according to the present invention,

[0021] FIG. 2 shows a first exemplary embodiment of a planetary gear set of the electromechanical brake pressure generator according to the present invention.

[0022] FIG. 3 shows a second exemplary embodiment of a planetary gear set of the electromechanical brake pressure generator according to the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0023] FIG. 1 shows a schematic illustration of one exemplary embodiment of a drive train 14 of an electromechanical brake pressure generator according to the present invention. Drive train 14 includes an electric motor 18, via which an input speed may be generated. Electric motor 18 is mechanically connected to an input side of a planetary gear set 22. In this exemplary embodiment, planetary gear set 22 is positioned coaxially to an electric motor axis 26. Planetary gear set 22 is additionally situated at a housing part 28 of the brake pressure generator that may be a valve housing, for example.

[0024] Via planetary gear set 22 the input speed of electric motor 18 is converted into a slower speed. Planetary gear set 22 is mechanically connected to a hydraulic module 30 at an output side. Hydraulic module 30 may have a brake pressure piston that is movable via a spindle nut arrangement in the axial direction to generate brake pressure. Drive train 14 illustrated in this exemplary embodiment is situated biaxially; this means that hydraulic module 30 is situated in parallel to electric motor axis 26.

[0025] FIG. 2 shows a first exemplary embodiment of a planetary gear set 22 of the electromechanical brake pressure generator according to the present invention. Planetary gear set 22 is connected via an electric motor shaft 34 to electric motor 18. At an end of electric motor shaft 34 a sun wheel 38 is rotatably fixedly situated, which is rotatable together with electric motor shaft 34. Sun wheel 38 is directly mechanically engaged with a first toothing area 42 of several stepped planets 46.

[0026] In this exemplary embodiment, stepped planets 46 have a bearing area 50, which is directly adjacent to first toothing area 46 and via which stepped planets 46 are rotatably mounted in a bore 54 of a planet carrier 58 in each case. In this way, no additional axle for mounting stepped planets 46 is necessary. In this exemplary embodiment, bearing area 50 and/or bore 54 is/are formed from a material that has a lubricating effect. Thus, no additional rolling or friction bearing is necessary for mounting stepped planets 46.

[0027] A second toothing area 62, which has a smaller diameter than first toothing area 42, is situated directly adjacent to bearing area 50. Moreover, second toothing area 62 has a smaller diameter than bearing area 50. In this way, an installation of stepped planets 46 in bores 54 is ensured. It is additionally ensured that an inner wall of bore 54 is not in contact with second toothing area 62.

[0028] Second toothing area 62 is directly engaged with an annulus gear 66, at which an inner toothing is formed. Annulus gear 66 is rotatably fixedly connected to housing part 28, which may be a valve housing of the brake pressure generator, for example.

[0029] Planet carrier 58 is mounted on the opposite side of housing part 28. Between planet carrier 58 and housing part 28, a bearing 74 is situated, via which planet carrier 58 is rotatable with regard to housing part 28. To directly mount planet carrier 58 with regard to housing part 28, planet carrier 58 has a planet carrier structural element 78, which is partially embedded in planet carrier 58, in this exemplary embodiment. Via planet carrier structural element 78, bearing loads may be received and distributed.

[0030] In this exemplary embodiment, planet carrier 58 is designed as an output component. For this purpose, planet carrier 58 includes a spur wheel 82, via which same is mechanically connected to hydraulic module 30.

[0031] FIG. 3 shows a second exemplary embodiment of a planetary gear set 22 of the electromechanical brake pressure generator according to the present invention. In contrast to the first exemplary embodiment shown in FIG. 2, stepped planets 46 are rotatably mounted via planet axles 86. Planet axles 86 are fixedly connected to housing part 28. In addition, stepped planets 46 do not have a bearing area 50. In this exemplary embodiment, second toothing area 62 is directly adjacent to larger first toothing area 46.

[0032] Annulus gear 66 has an inner toothing that is engaged with second toothing area 62 of stepped planets 46. In this exemplary embodiment, annulus gear 66 is rotatably mounted with regard to housing part 28 via a bearing 74. To directly mount annulus gear 66 with regard to housing part 28, annulus gear 66 has an annulus gear structural element 90, which is partially embedded in annulus gear 66, in this exemplary embodiment. Via annulus gear structural element 90, bearing loads may be received and distributed.

[0033] In contrast to the first exemplary embodiment, annulus gear 66 is designed as an output component in this exemplary embodiment. For this purpose, annulus gear 66 includes a spur wheel 82, via which same is mechanically connected to hydraulic module 30.