SPINDLE DRIVE UNIT FOR AN ELECTROMECHANICAL BRAKE PRESSURE GENERATOR, ELECTROMECHANICAL BRAKE PRESSURE GENERATOR

Abstract

A spindle drive unit for an electromechanical brake pressure generator in a hydraulic braking system of a vehicle for converting the rotational motion of a drive shaft of an electric motor into a translational motion of a piston that is coupled to the spindle drive unit. The spindle drive unit and/or the piston are/is enclosed, at least in sections, by an adapter sleeve having a male thread for screwing into a housing of the brake pressure generator. An electromechanical brake pressure generator that includes a spindle drive unit of this type is also described.

Claims

1-10. (canceled)

11. A spindle drive unit for an electromechanical brake pressure generator in a hydraulic braking system of a vehicle for converting a rotational motion of a drive shaft of an electric motor into a translational motion of a piston that is coupled to the spindle drive unit, the spindle drive unit comprising: an adapter sleeve, the spindle drive unit and/or the piston being enclosed, at least in sections, by the adapter sleeve, the adapter sleeve having a male thread for screwing into a housing of the brake pressure generator.

12. The spindle drive unit as recited in claim 11, wherein a roller bearing or ball bearing is mounted on and/or pressed onto, the adapter sleeve, the roller bearing or ball bearing being supported on a stop of the adapter sleeve in an axial direction.

13. The spindle drive unit as recited in claim 11, further comprising: a gearwheel configured to couple to the drive shaft.

14. The spindle drive unit as recited in claim 13, wherein the gearwheel is configured to directly or indirectly couple to a pinion of the drive shaft.

15. The spindle drive unit as recited in claim 11, wherein the adapter sleeve has an inner contour with at least one groove for forming a torque support.

16. The spindle drive unit as recited in claim 15, wherein the at least one groove includes two or three or four grooves,

17. The spindle drive unit as recited in claim 15, wherein a spindle or a spindle nut of the spindle drive unit has an outer contour with at least one wing that engages with the groove.

18. The spindle drive unit as recited in claim 15, wherein the piston is rotatably fixedly connected to a spindle of the spindle drive unit, and has an outer contour with at least one wing that engages with the groove.

19. The spindle drive unit as recited in claim 11, wherein the adapter sleeve is made of metal.

20. The spindle drive unit as recited in claim 19, wherein the metal is steel or aluminum.

21. The spindle drive unit as recited in claim 15, wherein a drive-side end of the spindle drive unit includes a cap having at least one opening on an end-face side for the engagement of an installation tool, a number and angular position of the at least one opening corresponding to a number and angular position of the at least one groove of the adapter sleeve.

22. An electromechanical brake pressure generator for a hydraulic braking system of a vehicle, comprising: a spindle drive unit for converting a rotational motion of a drive shaft of an electric motor into a translational motion of a piston that is coupled to the spindle drive unit, the spindle drive unit including an adapter sleeve, the spindle drive unit and/or the piston being enclosed, at least in sections, by the adapter sleeve, the adapter sleeve having a male thread for screwing into a housing of the brake pressure generator, the spindle drive unit being screwed, via the adapter sleeve, into the housing of the brake pressure generator, in which the electric motor is accommodated.

23. The electromechanical brake pressure generator as recited in claim 22, wherein the spindle drive unit which is screwed into the housing via the adapter sleeve is secured against loosening of the screw connection by a rotational direction of the male thread of the adapter sleeve and/or by an additional safeguard against loosening in the form of a coating of the male thread.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 shows a longitudinal section through an electromechanical brake pressure generator with a spindle drive unit according to an example embodiment of the present invention.

[0022] FIGS. 2A and 2B each show a perspective illustration of the adapter sleeve of the spindle drive unit in FIG. 1.

[0023] FIG. 3 shows a perspective illustration of the spindle nut of the spindle drive in FIG. 1.

[0024] FIG. 4 shows a perspective illustration of the spindle drive unit in FIG. 1.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0025] Electromechanical brake pressure generator 2 illustrated in FIG. 1 includes a housing 8 in which a spindle drive unit 1 according to the present invention with a piston 5, and an electric motor 4 with a drive shaft 3 are accommodated. Piston 5 and drive shaft 3 are situated axially parallel. That is, a longitudinal axis A.sub.1 of piston 5 and a longitudinal axis A.sub.2 of drive shaft 3 are aligned in parallel. In the present case, piston 5 is embodied as a hollow cylinder that is closed on the end-face side.

[0026] Drive shaft 3 is connected to a pinion 11 that meshes with a gearwheel 12 of the spindle drive unit 1, so that the rotational motion of drive shaft 3 is transferable to spindle drive unit 1. To convert the rotational motion of drive shaft 3 into a translational motion of piston 5, spindle drive unit 1 includes a spindle 14 and a spindle nut 15, which in the illustrated exemplary embodiment are accommodated in hollow cylindrical piston 5. Piston 5 in turn is enclosed, at least in sections, by an adapter sleeve 6 with a male thread 7, via which spindle drive unit 1 is screwed into housing 8 of brake pressure generator 2. Spindle drive unit 1 together with spindle 14 and spindle nut 15, piston 5, and adapter sleeve 6 form a module that is preassembled and inserted or screwed as a unit into housing 8 of brake pressure generator 2. At the same time, fixing of the module in housing 8 is ensured via the screw connection.

[0027] In the exemplary embodiment illustrated in FIG. 1, the preassembled module includes further components. These include a ball bearing 9 that is pressed onto adapter sleeve 6, and a cap 17. Ball bearing 9 pressed onto adapter sleeve 6 is supported on a stop 10 in the axial direction, which in the present case is formed by an annular collar 19 of adapter sleeve 6 (see also FIGS. 2A and 2B. Cap 17 encloses ball bearing 9 and the end of spindle drive unit 1 that protrudes from housing 8, so that the spindle drive unit is protected by cap 17. In addition, all components of the preassembled module are captively held by cap 17, which facilitates the insertion or screwing into housing 8. The screwing-in preferably takes place with the aid of an installation tool (not illustrated) which engages through openings 18 of cap 17 into grooves 13 of adapter sleeve 6 (see FIG. 2A and FIG. 4).

[0028] At the same time, a torque support of spindle drive unit 1 is achieved via grooves 13 of adapter sleeve 6. For this purpose, spindle nut 15 has an outer contour with wings 16 (see FIG. 3) that engage with grooves 13 of adapter sleeve 6.

[0029] Spindle drive unit 1 according to the present invention, including all components of the preassembled module, is shown in a single illustration in FIG. 4. That is, the spindle drive unit may also include gearwheel 12.