# US 11,906,007 B2 · S-cam brake

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- Number: US 11,906,007 B2
- Document ID: US11906007B2
- Status: Granted
- Kind: B2
- Application number: 17/517,154
- Filed: 2021-11-02
- Published: 2023-02-02
- Granted: 2024-02-20
- Earliest claimed: 2021-07-27
- Assignees: Hyundai Motor Company; Kia Corporation
- Applicants: Hyundai Motor Company; Kia Corporation
- Inventors: Sang Weol Han; Jung Hoon Jin; Yoon Hwan Kim
- Web page: https://patentgrep.com/patent/US11906007B2

## CPC

- F16D 65/22: adapted for pressing members apart {, e.g. for drum brakes}
- F16D 51/22: mechanically actuated
- F16D 51/24: fluid actuated
- F16D 65/0006: {Noise or vibration control}
- F16D 65/38: Slack adjusters
- F16D 2121/08: acting on a membrane-type actuator, e.g. for gas pressure
- F16D 2125/30: acting on two or more cam followers, e.g. S-cams
- F16D 2200/0013: Cast iron
- F16D 2250/0007: Casting
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

An S-cam brake including a brake chamber to which compressed air is supplied; a slack adjuster rotatably connecting to the brake chamber; an S-cam unit having an S-cam connecting to and rotating around the slack adjuster; and a drum having a lining generating braking force with widening according to rotation of the S-cam is provided, wherein the brake chamber includes an upper housing having an air supply port through which compressed air is introduced; a lower housing coupled to the upper housing to form an internal space; a diaphragm having edges fixed to the upper housing and the lower housing and deformed by compressed air; a piston disposed to contact the diaphragm and move linearly; a piston push rod extending from the piston and having one end connected to the slack adjuster; and a spring having one end supported by the piston and the other end supported by the lower housing, wherein a thickness of the upper housing is greater than a thickness of the lower housing.

## Claims

### Claim 1

An S-cam brake comprising:
a brake chamber to which compressed air is supplied;
a slack adjuster rotatably connected to the brake chamber;
an S-cam unit having an S-cam connected to and rotating around the slack adjuster; and
a drum having a lining generating braking force with widening according to rotation of the S-cam,
wherein the brake chamber comprises:
an upper housing having an air supply port through which the compressed air is introduced;
a lower housing coupled to the upper housing to form an internal space;
a diaphragm having edges fixed to the upper housing and the lower housing and deformed by the compressed air;
a piston disposed to contact the diaphragm and move linearly;
a piston push rod extending from the piston and having one end connected to the slack adjuster; and
a spring having one end supported by the piston and the other end supported by the lower housing,
wherein a thickness of the upper housing is greater than a thickness of the lower housing,
wherein a bottom surface of the upper housing comprises a channel connected to the air supply port, and
wherein the channel is formed of a groove having a ‘+’ shape, in bottom view.

### Claim 2 (depends on 1)

The S-cam brake of claim 1, wherein a weight of the upper housing is 8.0 Kg to 9.7 Kg.

### Claim 3 (depends on 1)

The S-cam brake of claim 1, wherein a thickness of a central portion of the upper housing is 30 mm to 36 mm.

### Claim 4 (depends on 1)

The S-cam brake of claim 1, wherein the upper housing is formed of a casting containing an iron component.

### Claim 5 (depends on 1)

The S-cam brake of claim 1, wherein the diaphragm is disposed to contact the bottom surface of the upper housing when the compressed air is not supplied, and the channel forms a space between the bottom surface of the upper housing and the diaphragm.

### Claim 6 (depends on 1)

The S-cam brake of claim 1, wherein the channel has a width of 4 mm to 8 mm, a depth of 4 mm to 8 mm, and a length of 80 mm to 100 mm.

### Claim 7 (depends on 1)

The S-cam brake of claim 1, wherein the channel is formed of a groove having a circular or polygonal shape, in bottom view.

### Claim 8 (depends on 1)

The S-cam brake of claim 1, wherein the channel is formed of a groove having a polygonal funnel shape in which a lower portion thereof is wider than an upper portion thereof.

### Claim 9

An S-cam brake comprising:
a brake chamber to which compressed air is supplied;
a slack adjuster rotatably connected to the brake chamber;
an S-cam unit having an S-cam connected to and rotating around the slack adjuster; and
a drum having a lining generating braking force with widening according to rotation of the S-cam,
wherein the brake chamber comprises:
an upper housing having an air supply port through which the compressed air is introduced;
a lower housing coupled to the upper housing to form an internal space; and
a diaphragm having edges fixed to the upper housing and the lower housing and deformed by the compressed air,
wherein a weight of the upper housing is 8.0 Kg to 9.7 Kg,
wherein a bottom surface of the upper housing comprises a channel connected to the air supply port, and
wherein the channel is formed of a groove having a ‘+’ shape, in bottom view.

### Claim 10 (depends on 9)

The S-cam brake of claim 9, wherein the diaphragm is disposed to contact a bottom surface of the upper housing when the compressed air is not supplied, and a channel forms a space between the bottom surface of the upper housing and the diaphragm.