ELECTROMECHANICAL BRAKE PRESSURE GENERATOR INCLUDING A GEAR AND METHOD FOR MANUFACTURING A GEAR FOR AN ELECTROMECHANICAL BRAKE PRESSURE GENERATOR

Abstract

An electromechanical brake pressure generator for a hydraulic braking system of a vehicle. The electromechanical brake booster includes at least one gear for transferring a torque of the electric motor for brake pressure generation. The gear in this case includes a planetary carrier for supporting planetary wheels, planetary wheels pins which are connected to the planetary carrier and on which the planetary wheels are rotatably fastenable, and a pinion for transferring a drive torque or output torque, which is rotatably fixedly connected to the planetary carrier at a side thereof opposite the planetary wheel pins. At least the part of the planetary carrier that includes the planetary wheel pins is materially integrally formed with the latter from the same material.

Claims

1-10. (canceled)

11. An electromechanical brake pressure generator for a hydraulic braking system of a vehicle, comprising: at least one gear which is connected to an electric motor, the gear configured to transfer a torque of the electric motor for brake pressure generation, the gear including: a planetary carrier for supporting planetary wheels, planetary wheel pins which are connected to the planetary carrier and on which the planetary wheels are rotatably fastenable, and a pinion configured to transfer a drive torque or output torque, the pinion being rotatably fixedly connected to the planetary carrier at a side opposite the planetary wheel pins, wherein at least the part of the planetary carrier that includes the planetary wheel pins is materially integrally formed with the planetary wheel pins from the same material.

12. The electromechanical brake pressure generator as recited in claim 11, wherein the planetary carrier includes a shoulder between planetary wheel pins and the pinion, which forms a point of support for components of the gear.

13. The electromechanical brake pressure generator as recited in claim 11, wherein the pinion is materially integrally connected to the planetary carrier.

14. The electromechanical brake pressure generator as recited in claim 11, wherein the pinion is a plastic injection molded part.

15. The electromechanical brake pressure generator as recited in claim 11, wherein at least the part of the planetary carrier that forms the planetary wheel pins is a sintered part made of a metal.

16. The electromechanical brake pressure generator as recited in claim 11, wherein the planetary carrier also includes component structures made of plastic.

17. The electromechanical brake pressure generator as recited in claim 16, wherein the component structures are situated in an area between adjacent planetary wheel pins.

18. A method for manufacturing a gear of an electromechanical brake pressure generator, the gear including a planetary carrier for supporting planetary wheels, planetary wheel pins which are connected to the planetary carrier and on which the planetary wheels are rotatably fastenable, and a pinion configured to transfer a drive torque or output torque, the pinion being rotatably fixedly connected to the planetary carrier at a side opposite the planetary wheel pins, the method comprising: materially integrally manufacturing at least the planetary carrier and the planetary wheel pins using a primary shaping manufacturing method.

19. The method as recited in claim 18, wherein the primary shaping method is sintering or injection molding.

20. A vehicle, comprising: an electromechanical brake pressure generator for a hydraulic braking system, the electromechanical brake pressure generator including: at least one gear which is connected to an electric motor, the gear configured to transfer a torque of the electric motor for brake pressure generation, the gear including: a planetary carrier for supporting planetary wheels, planetary wheel pins which are connected to the planetary carrier and on which the planetary wheels are rotatably fastenable, and a pinion configured to transfer a drive torque or output torque, the pinion being rotatably fixedly connected to the planetary carrier at a side opposite the planetary wheel pins, wherein at least the part of the planetary carrier that includes the planetary wheel pins is materially integrally formed with the planetary wheel pins from the same material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Exemplary embodiments of the present invention are represented in the figures and explained in greater detail in the description below.

[0025] FIG. 1 shows a representation of an electromechanical brake booster from the related art,

[0026] FIG. 2 shows a simplified schematic representation of a hydraulic braking system from the related art for a vehicle including an electromechanical brake pressure generator.

[0027] FIG. 3 shows a perspective view of a first exemplary embodiment of a planetary carrier pinion, in accordance with the present invention.

[0028] FIG. 4 shows a perspective view of a second exemplary embodiment of a planetary carrier pinion, in accordance with the present invention.

[0029] FIG. 5 shows a perspective view of a third exemplary embodiment of a planetary carrier pinion, in accordance with the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0030] A simplified schematic representation of a hydraulic braking system 10 from the related art for a vehicle including an electromechanical brake pressure generator 14 is shown in FIG. 2. Hydraulic braking system 10 includes electromechanical brake pressure generator 14 and a piston/cylinder unit 18. Piston/cylinder unit 18 and electromechanical brake pressure generator 14 are both hydraulically connected to a brake hydraulic system 22, which is represented here only as a box.

[0031] Brake hydraulic system 22 is formed by various valves and further components to form a, for example, electronic stability program (ESP). In order to be able to decelerate the vehicle, brake hydraulic system 22 is also connected to at least one wheel braking unit 26, so that by a corresponding switching of valves, a brake force may be applied at wheel brake unit 26.

[0032] Piston/cylinder unit 18 is actuated using muscle force via a brake pedal 30. In contrast, the brake force of electromechanical brake pressure generator 14 is generated via an electric motor 34. For this purpose, electric motor 34 is connected to a gear 38, for example, a planetary gear, via which a threaded drive arrangement 42 is driven. Threaded drive arrangement 42 is connected to a hydraulic piston 46 situated in a hydraulic cylinder 44, so that a brake force is generatable.

[0033] A perspective view of a first exemplary embodiment of a planetary carrier pinion 50 is shown in FIG. 3. Planetary carrier pinion 50 according to the present invention in this case may be used in planetary gear 38 shown in FIG. 2. Planetary carrier pinion 50 includes an essentially circular and disk-shaped planetary carrier 54. Planetary carrier 54 in this exemplary embodiment is formed from a sintered metal.

[0034] Planetary wheel pins 58 extending in the axial direction, which are materially integrally formed with the planetary carrier 54, are situated at planetary carrier 54. In this exemplary embodiment, three planetary wheel pins 58 are situated at planetary carrier 54. A planetary gear (not shown) is rotatably fastenable at each of planetary wheel pins 58. Planetary carrier 54 also forms a shoulder 62, which is situated at a side opposite planetary wheel pins 58. This shoulder 62 is coaxially situated and has a smaller diameter than the rest of planetary carrier 54. Shoulder 62 in this case forms a point of support for a further component of gear 38, so that a, for example, ball bearing may be situated at this shoulder 62.

[0035] A pinion 66 oriented in the axial direction and coaxially positioned, which is rotatably fixedly connected to planetary carrier 54 and is usable for transferring a drive torque or output torque, is situated at this shoulder 62. Shoulder 62 is accordingly situated between pinion 66 and the rest of planetary carrier 54. Pinion 66 in this exemplary embodiment is materially integrally formed with shoulder 62 and thus with planetary carrier 54 and has a helical gearing 70. In order to be able to mount a bearing on shoulder 62, the outer diameter of pinion 66 is smaller than the diameter of shoulder 62. In this exemplary embodiment, entire planetary carrier pinion 50 is thus formed as a single part, which is manufactured in the form of a primary shaping manufacturing method, for example, with the aid of sintering.

[0036] FIG. 4 shows a perspective view of a second exemplary embodiment of planetary carrier pinion 50. This example differs from the first exemplary embodiment shown in FIG. 3 in that pinion 66 is molded onto planetary carrier 54 with the aid of an injection molding method. As a result, planetary carrier 54 and pinion 66 are formed from a different material. To be able to transfer a drive torque or output torque, planetary carrier 54 forms a pinion pin 74 on which pinion 66 is form-fittingly connected to planetary carrier 54.

[0037] A perspective view of a third exemplary embodiment of planetary carrier pinion 50 is shown in FIG. 5. This exemplary embodiment differs from the first exemplary embodiment shown in FIG. 3 to the extent that only the part of planetary carrier 54 forming planetary wheel pin 58 is formed from a shared material, so that planetary wheel pins 58 are materially integrally connected to planetary carrier 54. In this exemplary embodiment, planetary carrier 54 forms a circle sector 76 in the area of every planetary wheel pin 58. In order to be able to transfer a sufficient load, this material in this case is a sintered metal.

[0038] In an area between circle sectors 76, planetary carrier 54 forms a further material. In this exemplary embodiment, planetary carrier 54 includes component structures 78 made of plastic. The plastic in this case is introduced with the aid of injection molding. With these component structures 78, which are flexible and exhibit corresponding damping properties, a particular flexibility and damping of planetary carrier pinion 50 is set, so that a stiffness of the power train may be set. In this way overloads as a result of pressure peaks may be reduced.

[0039] In this exemplary embodiment, planetary carrier 54 is also materially integrally connected to shoulder 62 and to pinion 66. Shoulder 62 and pinion in this case are formed from the same material as planetary wheel pins 58 and thus materially integrally connected to these via corresponding circle sectors 76. In this way, a sufficient drive torque and output torque may be transferred via pinion 66 and corresponding circle sectors 76 to the planetary wheels situated at planetary wheel pins 58.