TRANSMISSION ASSEMBLY AND BRAKE BOOSTER

Abstract

A transmission assembly for a brake booster of a vehicle is disclosed. The transmission assembly comprises a rack module having a base section and at least one tooth row section; and at least one transmission arrangement for transmitting a moment, such as a torque. The at least one transmission arrangement is in engagement with the at least one tooth row section of the rack module and has a shaft, a screw wheel carried by the shaft and a cylindrical wheel. The at least one transmission arrangement has at least one relief element, which is arranged effectively in a load path of the at least one transmission arrangement, and brake booster for a vehicle that comprises an electric motor, a push rod and a transmission assembly, which acts between the electric motor and the push rod.

Claims

1. A transmission assembly for a brake booster of a vehicle, comprising a rack module having a base section and at least one tooth row section; and at least one transmission arrangement for transmitting a moment, wherein the at least one transmission arrangement is in engagement with the at least one tooth row section of the rack module and has a shaft, a screw wheel carried by the shaft and a cylindrical wheel, wherein the at least one transmission arrangement has at least one relief element, which is arranged effectively in a load path of the at least one transmission arrangement.

2. The transmission assembly according to claim 1, wherein the at least one relief element is designed to compensate for different rigidities in the load path.

3. The transmission assembly according to claim 1, wherein the at least one relief element is designed to compensate for a gear wheel offset.

4. The transmission assembly according to claim 1, wherein the at least one relief element is a damping element, wherein the damping element has a high or lower rigidity with respect to axial and/or radial forces and/or torsional moments.

5. The transmission assembly according to claim 1, wherein the at least one relief element is produced from rubber or a soft, plastic.

6. The transmission assembly according to claim 1, wherein the at least one relief element is elastically and/or plastically deformable.

7. The transmission assembly according to claim 1, wherein the at least one relief element is arranged effectively between the cylindrical wheel and the shaft of the at least one transmission arrangement.

8. The transmission assembly according to claim 1, wherein the cylindrical wheel of the at least one transmission arrangement has a main body and a gear wheel section, wherein the main body is designed as the at least one relief element.

9. The transmission assembly according to claim 1, wherein the rack module has two tooth row sections, and two transmission arrangements are provided, each of which, with its screw wheel, is in engagement with a tooth row section of the rack module.

10. A brake booster for a vehicle, comprising an electric motor, a push rod and a transmission assembly according to claim 1, which acts between the electric motor and the push rod.

11. The transmission assembly according to claim 2, wherein the at least one relief element is designed to compensate for a gear wheel offset.

12. The transmission assembly according to claim 3, wherein the at least one relief element is a damping element, wherein the damping element has a high or lower rigidity with respect to axial and/or radial forces and/or torsional moments.

13. The transmission assembly according to claim 4, wherein the at least one relief element is produced from rubber or a soft, plastic.

14. The transmission assembly according to claim 5, wherein the at least one relief element is elastically and/or plastically deformable.

15. The transmission assembly according to claim 3, wherein the at least one relief element is arranged effectively between the cylindrical wheel and the shaft of the at least one transmission arrangement.

16. The transmission assembly according to claim 3, wherein the cylindrical wheel of the at least one transmission arrangement has a main body and a gear wheel section, wherein the main body is designed as the at least one relief element.

17. The transmission assembly according to claim 3, wherein the rack module has two tooth row sections, and two transmission arrangements are provided, each of which, with its screw wheel, is in engagement with a tooth row section of the rack module.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0028] Exemplary arrangements of the disclosure are described in greater detail below with reference to figures, which are schematic and illustrative and of which:

[0029] FIG. 1 shows a brake booster having a transmission assembly with load paths;

[0030] FIG. 2 shows a detail of the transmission assembly;

[0031] FIG. 3 shows a variant of the transmission assembly; and

[0032] FIG. 4 shows a further variant of the transmission assembly.

DETAILED DESCRIPTION

[0033] FIG. 1 shows schematically an electromechanical brake booster 1 for a motor vehicle. The brake booster 1 comprises an electric motor, a push rod and a transmission assembly 2 which is effective between the electric motor and the push rod. The gear assembly 2 is designed to convert a rotational movement generated by the electric motor into a linear movement of the push rod.

[0034] The transmission assembly 2 has a rack module 3 having a base section 4 and at least one tooth row section 5. In the exemplary arrangement under consideration, the rack module 3 has two tooth row sections 5 arranged on the base section 4.

[0035] The transmission assembly 2 furthermore has at least one transmission arrangement 6. The at least one transmission arrangement 6 is designed to transmit a moment, such as a torque. In the exemplary arrangement under consideration, the transmission assembly 2 has two transmission arrangements 6, each of which is in engagement with a tooth row section 5 of the rack module 3.

[0036] The transmission assembly 2 has and/or defines at least one or more load paths 7 (illustrated by the arrows in FIG. 1). At least one transmission arrangement 6 has at least one relief element 8 which is arranged effectively in a load path 7 of the at least one transmission arrangement 6.

[0037] FIG. 2 shows in detail a segment of the transmission assembly 2 according to FIG. 1.

[0038] The two transmission arrangements 6 of the transmission assembly 2 are in engagement with the tooth row sections 5 of the rack module 3. The tooth row sections 5 are arranged diametrically opposite one another in relation to the longitudinal axis of the base section 4, wherein a first transmission arrangement 6 is in engagement with a first tooth row section 5 of the rack module 3 and a second transmission arrangement 6 is in engagement with a second tooth row section 5 of the rack module 3.

[0039] Each transmission arrangement 6 has a shaft 9, a screw wheel 10 carried by the shaft 9, and a cylindrical wheel 11. The screw wheels 10 engage effectively in toothing of the tooth row section 5 of the rack module 3.

[0040] The at least one relief element 8 is designed to compensate for different stiffnesses in the load path 7 and/or to compensate for a gear wheel offset. The at least one relief element 8 can be a damping element which has a high or relatively low rigidity in relation to axial and/or radial forces and/or torsional moments. The at least one relief element 8 can be produced from rubber or a, in particular soft, plastic, and can be elastically and/or plastically deformable.

[0041] The at least one relief element 8 is arranged effectively between the cylindrical wheel 11 and the shaft 9 of at least one transmission arrangement 6. The cylindrical wheel 11 is designed as a gear wheel and has a radially inner main body 12 and a radially outer gear wheel section 13 concentric with the shaft 9. The gear wheel section 13 is designed in such a way that it is in engagement with an electric motor and is driven by the latter, for example via one or more gear wheels and/or shafts. The main body 12 is fitted onto the shaft 9 of the transmission arrangement 6 and is connected to the shaft 9 for conjoint rotation therewith. The main body 12 is the relief element 8 or is designed as a relief element 8.

[0042] In other respects, reference is additionally made, in particular, to FIG. 1 and the associated description.

[0043] FIG. 3 shows a variant of the transmission assembly 2 which has only a single relief element 8.

[0044] According to this variant, only the main body 12 of the cylindrical wheel 11 of the transmission arrangement 6, illustrated at the top in FIG. 3, is designed as a relief element 8. The cylindrical wheel 11 illustrated at the bottom in FIG. 3 has a conventional main body 12.

[0045] In other respects, reference is additionally made, in particular, to FIGS. 1 and 2 and the associated description.

[0046] FIG. 4 shows a further variant of the transmission assembly 2, which has two relief elements 8.

[0047] According to this variant, the main bodies 12 of the cylindrical wheels 11 of the two transmission arrangements 6 are each designed as a relief element 8.

[0048] In other respects, reference is additionally made, in particular, to FIGS. 1 to 3 and the associated description.

[0049] 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.

[0050] 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.