Abstract: A drum brake apparatus includes: a housing; a main braking unit disposed on a first portion of the housing, and the main braking unit configured to be, during main braking, driven by a hydraulic pressure and pressing a shoe; a parking braking unit disposed on a second portion of the housing, the parking braking unit configured to be, during parking braking, driven by an electromotive force of an actuator and pressing the shoe; a first locking member configured to couple the housing to one surface of a back plate; and a second locking member configured to couple the actuator to the housing on another surface side of the back plate.

Abstract: An electronic parking brake device may include: a gear unit driven by an actuator; a rotating rod connected to the gear unit; a push rod unit configured to pressurize one or more shoes while moved in connection with the rotating rod; a clutch unit disposed to interfere with a moving line of the gear unit, and configured to apply a rotational load to the gear unit while abutting on the gear unit, when the gear unit is rotated at a present angle; and a controller configured to control the operation of the actuator according to the load applied to the actuator.

Abstract: Disclosed is a mechanical drum brake capable of returning brake shoes into the initial position thereof when the braking operation is released. In the mechanical drum, the brake shoes are smoothly returned to the initial position thereof due to leaf springs, which are fixed to the back plate and interpose an adjusting nut of an adjuster therebetween, when braking is released.

Abstract: A parking brake having first and second brake shoes with first ends that engages an anchor on a backing plate and second ends that engages an adjuster. An actuator engages the first ends of the first and second brake shoes to apply an input force to move the first and second brake shoes into engagement with a drum to oppose rotation of a drum and effect a brake application. The adjuster is defined by a plurality of spring washers encapsulated in a cup and located between a first shaft connected to the first brake shoe and a second shaft connected to the second brake shoe. The spring washers yield to a predetermined resistance force greater than a input force such that a space between the first and second brake shoes is limited to a fixed distance and as a result a braking force to set at a predetermined maximum level.

Abstract: An actuator for a drum brake including a plunger connected through a resilient member to a linkage attached to a web on a brake shoe. A rod extends from the plunger and engages a lever arm that is pivotally retained on the web. The lever engages an extendable strut of an adjuster arrangement through which a running clearance is maintained between the brake shoe and a drum. During a brake application, pressurization fluid acts on the plunger to develop an operational force that is communicated through the resilient member to move the brake shoe into engagement with a drum. Should the operational force overcome the resilient member, the plunger moves toward the linkage and a reactive force is applied through the rod that acts through the lever arm to prevent a pawl from rotating such that a current length of the strut and correspondingly a current running clearance is sustained.

Abstract: A linkage for connecting a brake cable to an actuator lever in a drum-in-hat park brake assembly. The linkage is defined by a continuous wire that is shaped into a base with parallel and adjacent first and second legs located in a first plane perpendicular to the base and parallel and adjacent third and fourth legs located in a second plane perpendicular to the base. The first and second legs each have a first section that extend a first distance from the base to a first loop and a second section that extend a second distance from the first loop to a second loop while the third and fourth legs extend a third distance from the base. The base has an opening defined by a complementary shape created between the first leg and the third leg and the second leg and the fourth leg.

Abstract: An linkage for connecting a brake cable to an lever in a drum-in-hat park brake assembly. The linkage is defined by a continuous wire that is shaped into a first engagement section that is separated from a second engagement section by a center section. The first engagement section is define by a loop that extends from the center section while the second engagement section is defined by a hook with an end that is spaced apart from the center section a distance that is greater than a radius of the hook such that a resilient force is required to move the end in a plane away from the center section and thereafter receive a loop on the brake cable through which an actuation force is transmitted to move a lever and effect a brake application.

Abstract: An adjuster strut (10) for use in a drum brake assembly. The adjuster strut (10) has an adjustable elongate extent with first and second engagement means (17,37) disposed at opposite ends thereof for engaging opposed braking members (11,12,35) of a brake assembly. The first engagement means (17) is arranged for receipt and support within an inwardly opening slot (19,20) formed in one of the braking members (11,12,35) and includes an end face (18) for abutting engagement with the inner end wall (19a,20a) of the slot opening (19,20). The first engagement means (17) further includes a first channel (21) extending rearwardly from the face (18), for receiving therein an edge or wall portion (hereinafter an “edge portion”) defining the slot opening (19,20). The braking members can include opposed cross-sectionally T-shaped brake shoes and a parking brake lever disposed adjacent the inwardly extending web of one of the brake shoes.

Abstract: A parking brake having first and second brake shoes with a first end engaging an anchor post on a backing plate and a second end engaging an adjuster. An actuator located adjacent the anchor post has a first end that engages a first web on the first brake shoe and a second end the engages second web on the second brake shoe. A brake cable is connected to the actuator assembly for providing a force for moving the first and second brake shoes into engagement with the drum to effect a brake application. The actuator is characterized by a housing having first and second spaced apart walls with a first end and a second end. The first and second ends each have first and second ears with the first and second ears on the first end being joined together adjacent a central plane mid-way between the first and second side walls to establish a first slot that receives the first web.