Drum brake which can be operated by an electric motor

Abstract

A drum brake module for motor vehicles, the drum brake module being driven by an electric motor and having at least one parking brake function, includes an electromechanical cable pull actuator which is fastened on the anchor plate with the aid of an adapter. The adapter is designed as a one-piece, thin walled frame having at least one fastening flange for receiving the cable pull actuator and is held in place on the anchor plate.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 14 / 895,299, filed Dec. 2, 2015, which is national phase application of U.S. National Phase Application of PCT International Application No. PCT / EP2014 / 061514, filed Jun. 3, 2014, which claims priority to German Patent Application No. 10 2013 210 528.2, filed Jun. 6, 2013, the contents of such application being incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to an electrically actuated drum brake, in particular electromotively actuated drum brake module, with improved cable pull actuator arrangement for motor vehicles, comprising an electromechanical cable pull actuator which is arranged on an outer side of the anchor plate and which serves for driving a rotation-translation converter for converting a rotational drive input rotary movement into a translational actuation movement (B) of brake pads, which brake pads are arranged on an inn...

AI Technical Summary

Benefits of technology

[0009]In the case of the previously known systems, different vehicle requirements and differently exploitable installation conditions in the different motor vehicle models necessitate highly individual adaptations to a wide variety of components of the drum brake module. An aspect of the present invention therefore proposes solutions which permit particularly simple and efficient adaptation of a drum brake module to the various different motor vehicle applications in conjunction with particularly high efficiency.

[0010]To solve the problem, it is proposed that a drum brake module be provided which improves the adaptation to different installation conditions while at the same time maintaining a constant efficiency of the drum brake module over the service life, the cable pull actuator is assigned a cable pull guide body with a curved cable receptacle and with a U-shaped cross section. Said cable pull guide body may, as a separate component, be inserted, on an inner side of the carrier plate, into a positively locking receptacle so as to be forced into the receptacle by acting cable pull forces. The cable pull guidance function can be additionally improved by way of walls (U limbs) which are of raised form in the manner of a channel. The cable pull guide channel thus formed may be formed so as to be narrowed in funnel-shaped fashion proceeding from a cable inlet. The U limbs of the cable pull guide channel may furthermore be equipped with cams which at least partially engage over the cable so as to prevent an undesired escape of a slack cable, in particular in a released state of the brake. The cams may be provided, with an axial spacing to one another, in each case on opposite U limbs. The cable pull guide body may be of single-part or multi-part form. For example, the multi-part variant makes it possible for a holding component to be equipped with a cable pull guide channel component which has expedient friction characteristics. The single-part or multi-part cable pull guide body is finally fastened, by fastening means, to the anchor plate. For this purpose, on the cable pull guide body, there is preferably provided at least one detent means which comprises at least one elastic spring leg which engages elastically on a recess or on a cam of the anchor plate. The cable pull guide body may have incorporated solid lubricant constituents, and may preferably be composed of a plastics material that is resistant to high temperatures. Perpendicular to the cable axis, there may be provided one or more holding arms which are welded or riveted non-detachably, and directly or indirectly together with the support device, to the anchor plate.

Problems solved by technology

Parking brake cable pull systems with a central cable pull actuator are disadvantageous because, at a vehicle manufacturer, separate installation and articulation of the cable pull on the wheel brake is necessary, such that the final installation of cable pull actuator, cable pull and wheel brake can only be performed on the assembly line at the vehicle manufacturer, which increases the complexity of manufacture in that area.

This type of construction requires not only an electric motor which is dimensioned to be of relatively high power but also further very specifically designed components, and therefore does not permit simple variation in the context of mass production.

Problems arise in the event of hot shutdown.

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