Controlled contact guide pin for vehicle disc brakes

Patent metadata

Field	Value
Publication number	US-10054175-B2
Application number	US-201615355642-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Nov 18, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A guide pin, for a disc brake assembly, comprises a head portion and a stem. The stem extends from the head portion along an axis and has a circular cross section, a first stem portion, and a second stem portion. The first stem portion is adjacent a tip of the stem. The second stem portion is between the first portion and the head portion. The first stem portion has a first radius from the axis and the second stem portion has a second radius from the axis. The second radius is less than the first radius. A surface is on the first and second stem portions. A distance is from a plane to the surface. The plane is parallel to the surface and the axis is in the plane. The distance is less than the second radius.

First claim

What is claimed is:

1. A guide pin for a disc brake assembly, the guide pin comprising:
a head portion;
a stem extending from the head portion along an axis and having a circular cross section, a first stem portion adjacent a tip of the stem, and a second stem portion between the first stem portion and the head portion, wherein the first stem portion has a first radius from the axis, the second stem portion has a second radius from the axis, and the second radius is less than the first radius;
a planar surface on the first and second stem portions, wherein the planar surface intersects an arcuate surface defined by the first radius; and
a distance from a plane to the planar surface, wherein the plane is parallel to the planar surface, the axis is in the plane, and the distance is less than the second radius.

2. The guide pin of claim 1 further comprising:
a formed edge around the planar surface.

3. The guide pin of claim 1 further comprising:
at least one additional surface on the first stem portion; and
a second distance from the at least one additional surface to at least one additional plane corresponding to the at least one additional surface, wherein the at least one additional plane is parallel to the at least one additional surface, the axis is in the at least one additional plane, and the second distance is less than the first radius and not less than the second radius.

4. The guide pin of claim 3 wherein the at least one additional surface is planar.

5. The guide pin of claim 1 further comprising:
second and third surfaces on the first stem portion;
a second distance from a second plane to the second surface, wherein the second plane is parallel to the second and third surfaces and the axis is in the second plane; and
a third distance from the second plane to the third surface, wherein the second and third distances are each less than the first radius and not less than the second radius.

6. The guide pin of claim 5 wherein the second and third surfaces are planar.

7. The guide pin of claim 1 further comprising:
a bushing in a channel in the second stem portion, wherein the channel has a third radius that is less than the second radius.

8. The guide pin of claim 1 wherein the first and second stem portions are concentric.

9. The guide pin of claim 1 further comprising:
an anchor bracket having a bore, wherein the guide pin is slidably supported in the bore;
a brake caliper secured to the guide pin; and
inboard and outboard brake shoes supported on the anchor bracket by clips.

10. The guide pin of claim 1 , wherein the planar surface has a first width on the first stem portion and a second width on the second stem portion, the first width is transverse to the axis, the second width is parallel to the first width, and the first width is greater than the second width.

11. A disc brake assembly comprising:
first and second guide pins, wherein each of the first and second guide pins has
a head portion,
a stem extending from the head portion along an axis and having a circular cross section, a first stem portion adjacent a tip of the stem, and a second stem portion between the first stem portion and the head portion, wherein the first stem portion has a first radius from the axis, the second stem portion has a second radius from the axis, and the second radius is less than the first radius,
a planar surface on the first and second stem portions, wherein the planar surface intersects a circumference defined by the first radius, and
a distance from a plane to the planar surface, wherein the plane is parallel to the planar surface, the axis is in the plane, and the distance is less than the second radius;

an anchor bracket having first and second bores, wherein the first guide pin is slidably supported in the first bore and the second guide pin is slidably supported in the second bore;
a brake caliper secured to the first and second guide pins such that the planar surface of each of the first and second guide pins face in opposite directions; and
inboard and outboard brake shoes supported on the anchor bracket by clips.

12. The disc brake assembly of claim 11 wherein each of the first and second guide pins further have:
a formed edge around the planar surface.

13. The disc brake assembly of claim 11 wherein each of the first and second guide pins further have:
at least one additional surface on the first stem portion; and
a second distance from the at least one additional surface to at least one additional plane corresponding to the at least one additional surface, wherein the at least one additional plane is parallel to the at least one additional surface, the axis is in the at least one additional plane, and the second distance is less than the first radius and not less than the second radius.

14. The disc brake assembly of claim 13 wherein the at least one additional surface is planar.

15. A guide pin for a disc brake assembly, the guide pin comprising:
a head portion;
a stem extending from the head portion along an axis and having a circular cross section, a first stem portion adjacent a tip of the stem, and a second stem portion between the first stem portion and the head portion, wherein the first stem portion has a first radius from the axis, the second stem portion has a second radius from the axis, and the second radius is less than the first radius;
a planar first surface on the first and second stem portions, wherein the first surface intersects an arcuate surface defined by the first radius;
second and third surfaces on the first stem portion;
a first distance from a first plane to the first surface, wherein the first plane is parallel to the first surface, the axis is in the first plane, and the first distance is less than the second radius;
a second distance from a second plane to the second surface, wherein the second plane is parallel to the second and third surfaces and the axis is in the second plane; and
a third distance from the second plane to the third surface, wherein the second and third distances are each less than the first radius and not less than the second radius, the second and third surfaces are on opposite sides of the stem, and the first distance is perpendicular to the second and third distances.

16. The guide pin of claim 15 wherein the second and third surfaces are symmetric across the second plane.

17. The guide pin of claim 15 wherein the second and third distances are equal to the second radius.

18. The guide pin of claim 15 wherein the first surface intersects a second arcuate surface defined by the second radius.

19. The guide pin of claim 15 wherein the second and third surfaces intersect the arcuate surface defined by the first radius.

20. The guide pin of claim 15 wherein the first distance is perpendicular to the first surface, the second distance is perpendicular to the second surface, and the third distance is perpendicular to the third surface.

Assignees

• Kelsey Hayes Co

Inventors

• Kula Peter
• Berry Shawn

Classifications

• F16D55/227

  by two {or more} pins · CPC title

• F16D55/22655 Primary

  Constructional details of guide pins · CPC title

• F16D55/226

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• F16D65/095

  Pivots or supporting members therefor · CPC title

• F16D65/0087

  Brake housing guide members, e.g. caliper pins; Accessories therefor, e.g. dust boots · CPC title