# US 12,000,446 B2 · Drum brake having a load measurement device

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- Number: US 12,000,446 B2
- Document ID: US12000446B2
- Status: Granted
- Kind: B2
- Application number: 17/612,422
- Filed: 2020-05-20
- Published: 2022-07-21
- Granted: 2024-06-04
- Earliest claimed: 2019-05-24
- Assignees: Continental Teves AG & Co. oHG
- Applicants: Continental Teves AG & Co. OHG
- Inventors: Martin Gädke; Holger von Hayn; Matthias Schulitz; Ahmed Sefo; Uwe Bach; Adrian Messner; Wolfgang Ritter; Jens Hoffmann; Falk Petzold; Martin Kruse; Christian Vey; Ulrike Meyer
- Web page: https://patentgrep.com/patent/US12000446B2

## CPC

- B60T 8/171: Detecting parameters used in the regulation; Measuring values used in the regulation
- F16D 65/22: adapted for pressing members apart {, e.g. for drum brakes}
- F16D 51/24: fluid actuated
- F16D 65/08: for internally-engaging brakes
- F16D 2051/001: {Parts or details of drum brakes}
- F16D 2066/005: {Force, torque, stress or strain}
- F16D 2121/24: using motors
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A drum brake having a brake drum, brake shoes, a carrier plate and a load measurement device in the region of an abutment is mountable on a steering knuckle. The abutment has a cylinder in which two pistons are guided, on the outer end faces of which the abutment ends of the brake shoes rest and the inner end faces of which are each supported by a spring on a step in the cylinder. A hollow peg projects from the outside of the cylinder and penetrates an opening in the carrier plate, such that it can be received in a receiving space in the steering knuckle resting on the carrier plate or in a reinforcement element fixed on the steering knuckle.

## Claims

### Claim 1

A drum brake comprising:
a brake drum;
two brake shoes, which can be applied to the brake drum, are secured on the brake shoe side of a carrier plate and each have a pressure end and an abutment end;
a spreader device situated between the pressure ends;
an abutment having a cylinder in which two pistons are guided, on the outer end faces of which the abutment ends of the brake shoes rest and the inner end faces of which are each supported by a spring on a step in the cylinder;
a load measurement device situated between the abutment ends wherein, the load measurement device determines the load prevailing at the abutment; and
a hollow peg which projects from the outside of the cylinder and penetrates an opening in the carrier plate, such that it can be received in a receiving space located in one of a steering knuckle resting against the carrier plate and in a reinforcement element fixed on the steering knuckle.

### Claim 2 (depends on 1)

The drum brake as claimed in claim 1, wherein the cylinder has lateral lugs for receiving one of screws and rivets, wherein the one of screws and rivets penetrate the carrier plate to be fixed to the steering knuckle resting against the carrier plate.

### Claim 3 (depends on 1)

The drum brake as claimed in claim 1, further comprising sensors in the peg and elements in the pistons, wherein the elements are sensed by the sensors.

### Claim 4 (depends on 3)

The drum brake as claimed in claim 3, wherein the sensors are accommodated in a sensor housing, which is inserted with an accurate fit into the hollow peg ensuring that the sensors are opposite the elements that can be sensed.

### Claim 5 (depends on 1)

The drum brake as claimed in claim 1, wherein the springs are one of disk springs and spiral disk springs.

### Claim 6 (depends on 1)

The drum brake as claimed in claim 1, wherein the springs are sleeve springs.

### Claim 7 (depends on 1)

The drum brake as claimed in claim 1, wherein the pins project laterally from the pistons, the ends of which pins point toward the peg and which pins carry the elements that can be sensed.

### Claim 8 (depends on 7)

The drum brake as claimed in claim 7, wherein the pins run in a longitudinal slot in an inner step in the cylinder.

### Claim 9 (depends on 8)

The drum brake as claimed in claim 8, wherein the sensors are accommodated in a sensor housing, which is inserted with an accurate fit into the hollow peg, thus ensuring that the sensors are opposite the elements that can be sensed.

### Claim 10 (depends on 8)

The drum brake as claimed in claim 8, wherein the the sensors are AMR sensors, and the elements that can be sensed are magnets.

### Claim 11 (depends on 8)

The drum brake as claimed in claim 8, wherein the sensors are accommodated in a sensor housing, which is inserted with a correct orientation into the hollow peg, thus ensuring that the sensors are opposite the elements that can be sensed.

### Claim 12 (depends on 11)

The drum brake as claimed in claim 11, wherein there is coding on the sensor housing to ensure the correct orientation.

### Claim 13 (depends on 1)

The drum brake as claimed in claim 1, wherein the elements that can be sensed are mounted in or on the lateral surface of the pistons.