ASSEMBLY FOR A BRAKE BOOSTER AND BRAKE BOOSTER

Abstract

An assembly for a brake booster, for example, an electromechanical brake booster, comprises a motor output shaft of an electric motor, a transmission input shaft of a transmission which can be coupled to the electric motor, and a coupling element for power-transmitting coupling of the motor output shaft to the transmission input shaft. The coupling element has internal toothing which can be operatively connected or is operatively connected to the motor output shaft and to the transmission input shaft, as well as a brake booster with an assembly.

Claims

1. An assembly for a brake booster, comprising a motor output shaft an electric motor, a transmission input shaft of a transmission which can be coupled to the electric motor, and a coupling element for power-transmitting coupling of the motor output shaft to the transmission input shaft, wherein the coupling element has internal toothing which can be operatively connected or is operatively connected to the motor output shaft and to the transmission input shaft.

2. The assembly according to claim 1, wherein the motor output shaft has external toothing at least in some section or sections and/or the transmission input shaft has external toothing at least in some section or sections, wherein the external toothing of the motor output shaft and/or the external toothing of the transmission input shaft are/is designed to be complementary to the internal toothing of the coupling element.

3. The assembly according to claim 2, wherein the internal toothing of the coupling element is in engagement or can be brought into engagement with the external toothing of the motor output shaft and/or the external toothing of the transmission input shaft.

4. The assembly according to claim 1, wherein the coupling element and/or its internal toothing are/is designed to transmit a moment from the motor output shaft to the transmission input shaft.

5. The assembly according to claim 1, wherein the coupling element is designed as a sleeve having an axial through-hole, wherein the internal toothing is arranged in the through-hole.

6. The assembly according to claim 5, wherein the transmission input shaft has an end section which has external toothing and can be introduced or is introduced at least partially into the through-hole (5) of the coupling element.

7. The assembly according to claim 5, wherein the motor output shaft has an end section which has external toothing and can be introduced or is introduced at least partially into the through-hole of the coupling element.

8. The assembly according to claim 1, wherein the coupling element is arranged substantially between the motor output shaft and the transmission input shaft in an axial direction.

9. The assembly according to claim 1, wherein the assembly comprises a centering element for centering and/or aligning the motor output shaft and the transmission input shaft with respect to one another.

10. The assembly according to claim 9, wherein the centering element is arranged substantially between the motor output shaft and the transmission input shaft in the axial direction, in particular substantially between the motor output shaft and the coupling element or substantially between the transmission input shaft and the coupling element.

11. The assembly according to claim 9 wherein, the centering element has internal toothing, which can be operatively connected or is operatively connected to the motor output shaft to the transmission input shaft.

12. The assembly according to claim 11, wherein the internal toothing of the centering element is in engagement or can be brought into engagement with external toothing the motor output shaft or with the external toothing of the transmission input shaft.

13. The assembly according to claim 11, wherein the internal toothing of the centering element of complementary design to the external toothing of the motor output shaft and/or the external toothing of the transmission input shaft and/or to the internal toothing of the coupling element.

14. The assembly according to claim 9, wherein the centering element is designed as a sleeve having an axial through-hole, wherein the internal toothing is arranged in the through-hole.

15. The assembly according to claim 14, wherein an end section of the motor output shaft having external toothing can be passed or is passed through the through-hole of the centering element, or an end section of the transmission input shaft having external toothing can be passed or is passed through the through-hole of the centering element.

16. The assembly according to claim 9, wherein the centering element has a centering structure, and the coupling element has a counter-centering structure, which interacts with and/or corresponds to the centering structure of the centering element.

17. The assembly according to claim 16, wherein the centering structure and the counter-centering structure are designed to effect centering and/or alignment in a radial and/or axial direction and/or in a circumferential direction.

18. The assembly according to claim 16, wherein the centering structure and the counter-centring structure engage in one another substantially in an axial direction.

19. The assembly according to claim 16, wherein the centering structure and/or the counter-centering structure have/has a tooth structure and/or wedge structure, wherein the tooth structure and/or wedge structure are/is designed to effect centering and/or alignment in an axial direction and/or in a circumferential direction.

20. The assembly according to claim 16, wherein the centering structure has an inside diameter, and the counter-centering structure has an outside diameter, wherein the inside diameter of the centering structure and the outside diameter of the counter-centering structure are designed to effect radial centering and/or alignment.

21. The assembly according to claim 9, wherein a spring is arranged effectively between the centering element and the motor output shaft in an axial direction, or a spring element is arranged effectively between the centering element and the transmission input shaft in the axial direction.

22. (canceled)

Description

BRIEF DESCRIPTION OF DRAWINGS

[0034] Exemplary arrangements of the disclosure are described in greater detail below with reference to figures, which are schematic and illustrative and of which:

[0035] FIG. 1 shows a first view of an assembly having a coupling element;

[0036] FIG. 2 shows a second view of the assembly according to FIG. 1;

[0037] FIG. 3 shows a third view of the assembly according to FIG. 1;

[0038] FIG. 4 shows a fourth view of the assembly according to FIG. 1;

[0039] FIG. 5 shows a fifth view of the assembly according to FIG. 1;

[0040] FIG. 6 shows a sectional view of the assembly according to FIG. 1;

[0041] FIG. 7 shows a first view of an assembly having a coupling element and a centering element;

[0042] FIG. 8 shows a second view of the assembly according to FIG. 7;

[0043] FIG. 9 shows a third view of the assembly according to FIG. 7;

[0044] FIG. 10 shows a fourth view of the assembly according to FIG. 7;

[0045] FIG. 11 shows a fifth view of the assembly according to FIG. 7; and

[0046] FIG. 12 shows a sectional view of the assembly according to FIG. 7.

DETAILED DESCRIPTION

[0047] FIGS. 1 to 6 show various views of an assembly 1 for a brake booster, in particular for an electromechanical brake booster.

[0048] The assembly 1 comprises a motor output shaft 2 of an electric motor of the brake booster, a transmission input shaft 3 of a transmission of the brake booster, which can be coupled to the electric motor, and a coupling element 4 for power-transmitting coupling of the motor output shaft 2 to the transmission input shaft 3. The coupling element 4 is designed as a sleeve, such as a coupling sleeve, and has, in a through-hole 5, internal toothing 6, which can be operatively connected or is operatively connected to the motor output shaft 2 and to the transmission input shaft 3. With respect to the centre axis 7, the coupling element 4 is arranged substantially between the motor output shaft 2 and the transmission input shaft 3 in the axial direction.

[0049] The internal toothing 6 of the coupling element 4 is spline toothing extending in the axial direction with respect to a centre axis 7. The internal toothing 6 of the coupling element 4 has a multiplicity of tooth elements which, with respect to the centre axis 7, extend radially inwards in the radial direction in each case from a tooth root to a tooth tip and are of substantially trapezoidal and/or triangular design in cross section.

[0050] The motor output shaft 2 has an end section 8 with external toothing 9. The transmission input shaft 3 has an end section 10 with external toothing 11. The external toothing 9 of the motor output shaft 2 and the external toothing 11 of the transmission input shaft 3 are of complementary design to the internal toothing 6 of the coupling element 4.

[0051] The external toothing 9 of the motor output shaft 2 and the external toothing 11 of the transmission input shaft 3 are spline teeth extending in the axial direction with respect to the centre axis 7. The external toothing 9 of the motor output shaft 2 and the external toothing 11 of the transmission input shaft 3 each have a multiplicity of tooth elements which, with respect to the centre axis 7, extend radially outwards in the radial direction in each case from a tooth root to a tooth tip and are of substantially trapezoidal and/or triangular design in cross section.

[0052] The end section 10 of the transmission input shaft 3, which has the external toothing 11, can be introduced or is introduced at least partially into the through-hole 5 of the coupling element 4 at a first end face of the coupling element 4. The end section 8 of the motor output shaft 2, which has the external toothing 9, can be introduced or is introduced at least partially into the through-hole 5 of the coupling element 4 at a second end face of the coupling element 4 lying opposite the first end face. The internal toothing 6 of the coupling element 4 is in engagement or can be brought into engagement with the external toothing 9 of the motor output shaft 2 and the external toothing 11 of the transmission input shaft 3. The coupling element 4 and its internal toothing 6 are designed to transmit a moment, such as torque, from the motor output shaft 2 to the transmission input shaft 3.

[0053] FIGS. 7 to 12 show various views of an assembly 12 for a brake booster for example, for an electromechanical brake booster.

[0054] In contrast to the assembly 1 according to FIGS. 1 to 6, the assembly 12 additionally has a centring element 13 for centring and/or aligning the motor output shaft 2 and the transmission input shaft 3 with respect to one another, as well as a spring element 14.

[0055] With respect to the centre axis 7, the centering element 13 is arranged substantially between the motor output shaft 2 and the coupling element 4 in the axial direction. The centring element 13 is designed as a centering sleeve and has an axial through-hole 15 with internal toothing 16, which can be operatively connected or is operatively connected to the motor output shaft 2.

[0056] The internal toothing 16 of the centering element 13 is spline toothing extending in the axial direction with respect to a centre axis 7. The internal toothing 16 of the centering element 13 has a multiplicity of tooth elements which, with respect to the centre axis 7, extend radially inwards in the radial direction in each case from a tooth root to a tooth tip and are of substantially trapezoidal and/or triangular design in cross section. The internal toothing 16 of the centring element 13 is of complementary design to the external toothing 9 of the motor output shaft 2 and is in engagement or can be brought into engagement with the external toothing 9 of the motor output shaft 2. The end section 8 of the motor output shaft 2 having the external toothing 9 can be passed or is passed through the through-hole 15 of the centering element 13, for example if the spring element is displaced and/or compressed in the axial direction counter to its spring force by the centering element.

[0057] The centering element has a centering structure 18 in an axial end region 17. In an axial end region 19, the coupling element 4 has a counter-centring structure 20 which interacts with and corresponds to the centering structure 18 of the centering element 13. The centering structure 18 and the counter-centering structure 20 can engage in one another substantially in the axial direction and, for this purpose, have a tooth structure and/or wedge structure. The centering structure 18 and the counter-centering structure 20 are designed to effect centering and/or alignment in the radial and/or axial direction and/or in the circumferential direction. The centering structure 18 furthermore has an inside diameter 21, and the counter-centering structure 20 furthermore has an outside diameter 22. The inside diameter 21 of the centering structure 18 and the outside diameter 22 of the counter-centering structure 20 are designed to effect centring and/or alignment in the radial direction.

[0058] With respect to the centre axis 7, the spring element 14 is arranged effectively between the centering element 18 and the motor output shaft 2 in the axial direction. The spring element 14 is designed as a helical spring and is supported, on the one hand, on a shoulder of the motor output shaft 2 and, on the other hand, on the centering element 13. The spring element 14 is designed to make the centering element 13 project partially beyond the end section 8 of the motor output shaft 2, with the result that, in an initial position, the end section 8 of the motor output shaft 2 does not project beyond the centering element 13, or does not project completely through it, in the axial direction. Only when the spring element 14 is compressed in the axial direction counter to the spring force, for example when the centering element 13 and the coupling element 4 and/or the transmission input shaft 3 and the motor output shaft 2 are brought together, does the end section 8 of the motor output shaft 2 pass through the centering element 13 in the axial direction and come into optimum engagement with the internal toothing 6 of the coupling element 4.

[0059] In other respects, reference is additionally made, for example, to FIGS. 1 to 6 and the associated description.

[0060] In particular, “can” denotes optional features of the disclosure. Accordingly, there are also developments and/or exemplary arrangements of the disclosure that have the respective feature or features in addition or as an alternative.

[0061] If required, isolated features can also be selected from the combinations of features disclosed here and, breaking up a structural and/or functional relationship which may exist between said features, can be used in combination with other features to delimit the subject matter of a claim.