S-CAM BRAKE OF HORIZONTAL TRANSFERRING FORCE TYPE

• US 20190331182A1
• Filed: 12/05/2018
• Published: 10/31/2019
• Est. Priority Date: 04/30/2018
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Gim, Hyeong-U
• Granted Patent: US 10,753,413 B2
• Time in Patent Office: Days
• CPC Class Codes: F16D 2121/08 acting on a membrane-type actuator, e.g. for gas pressure
• CPC Class Codes: F16D 2125/30 acting on two or more cam followers, e.g. S-cams
• CPC Class Codes: F16D 51/22 mechanically actuated
• CPC Class Codes: F16D 65/22 adapted for pressing members apart , e.g. for drum brakes
• CPC Class Codes: F16D 65/38 Slack adjusters

Abstract

An S-cam brake includes an S-cam unit for braking a drum, where the S-cam unit includes an S-cam of an “S” shape having an involute tooth profile at left and right sides thereof, and horizontal tangential members forming contacting surfaces engaged with the involute tooth profile symmetrically around a center point of a circle at the left and right sides of the S-cam, and being spread at the left and right sides with normal lines of the contacting surfaces as a horizontal direction when the S-cam rotates.

Claims

1. An S-cam brake, comprising:

an S-cam unit for braking a drum,

wherein the S-cam unit includes;

an S-cam of “

S”

shape having an involute tooth profile at left and right sides thereof; and

horizontal tangential members forming contacting surfaces engaged with the involute tooth profile symmetrically around a center point of a circle at the left and right sides of the S-cam, and being spread at the left and right sides with normal lines of the contacting surfaces as a horizontal direction when the S-cam rotates.

2. The S-cam brake of claim 1, wherein the horizontal tangential members form the horizontal direction by the involute tooth profile formed at left and right surfaces thereof.

3. The S-cam brake of claim 2, wherein an upper center hole and a lower center hole are drilled in the horizontal tangential members at an interval and the horizontal tangential members are arranged symmetrically with respect to the center of the interval.

4. The S-cam brake of claim 3, wherein a fixing member is fastened to each of the upper center hole and the lower center hole.

5. The S-cam brake of claim 2, wherein:

the horizontal tangential members are divided into a left involute cam and a right involute cam;

the left involute cam forms the contacting surface at the left side of the S-cam; and

the right involute cam forms the contacting surface at the right side of the S-cam.

6. The S-cam brake of claim 5, wherein each of the positions of the left involute cam and the right involute cam is upwardly and downwardly distinguished with respect to the center of the S-cam.

7. The S-cam brake of claim 1, wherein:

the horizontal tangential members form the horizontal direction by the involute tooth profile formed at one side surface thereof; and

a cut-off surface is formed on an opposite side surface not forming the involute tooth profile.

8. The S-cam brake of claim 7, wherein:

an upper center hole and a lower center hole are drilled in the horizontal tangential members at an interval; and

the upper center hole and the lower center hole are positioned inside the cut-off surface.

9. The S-cam brake of claim 8, wherein:

a fixing member is fastened to each of the upper center hole and the lower center hole.

10. The S-cam brake of claim 7, wherein:

the horizontal tangential members are divided into a left variant involute cam and a right variant involute cam;

the left variant involute cam forms the contacting surface at the left side of the S-cam; and

the right variant involute cam forms the contacting surface at the right side of the S-cam.

11. The S-cam brake of claim 10, wherein each of the positions of the left variant involute cam and the right variant involute cam is upwardly and downwardly distinguished with respect to the center of the S-cam.

12. The S-cam brake of claim 1, wherein the horizontal tangential members form the horizontal direction by the circular exterior diameter.

13. The S-cam brake of claim 12, wherein:

the horizontal tangential members are divided into a left roller and a right roller;

the left roller forms the contacting surface at the left side of the S-cam; and

the right roller forms the contacting surface at the right side of the S-cam.

14. The S-cam brake of claim 13, wherein each of the positions of the left roller and the right roller is upwardly and downwardly distinguished with respect to the center of the S-cam.

15. The S-cam brake of claim 1, wherein:

the S-cam is engaged with a slack adjuster through a cam pin; and

the cam pin acts as a rotation center of the S-cam by movement of the slack adjuster.

16. The S-cam brake of claim 15, wherein the slack adjuster is operated as a brake chamber receiving the supply of compress air when a brake pedal is operated.

17. The S-cam brake of claim 1, wherein the horizontal tangential members form the contacting surfaces without protruding beyond the abrasion limit line of a lining provided at the drum.