Disk brake caliper piston system

Patent metadata

Field	Value
Publication number	US-9593728-B2
Application number	US-201514805469-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Jul 22, 2015
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A disk brake piston system having a piston having a metallic outer wall surrounding a central axis, the outer wall being of a material and a thickness which that could be formed by deep drawing; a metallic front wall closing one end of the outer wall, the front wall including a curved area extending toward an interior of the piston, the front wall being of a material and having a thickness that could be formed by deep drawing; and a sleeve positioned at least partially within the piston and configured to interface with an interior side surface of the outer wall such that the sleeve and the piston are restrained from rotating relative to one another around an axis parallel to the central axis, the sleeve comprising a flat or curved internal surface, having a non-circular cross-section, wherein the sleeve comprises a polymeric material.

First claim

The invention claimed is:

1. A disk brake piston system comprising:
a piston comprising:
a metallic outer wall surrounding a central axis, the outer wall being of a material and a thickness which that could be formed by deep drawing;
a metallic front wall closing one end of the outer wall, the front wall including a curved area extending toward an interior of the piston, the front wall being of a material and having a thickness that could be formed by deep drawing; and
a sleeve positioned at least partially within the piston and configured to interface with an interior side surface of the outer wall such that the sleeve and the piston are restrained from rotating relative to one another around an axis parallel to the central axis, the sleeve comprising a flat or curved internal surface, having a non-circular cross-section, wherein the sleeve comprises a polymeric material.

2. The disk brake piston system of claim 1 further comprising a nut located within the sleeve, the nut comprising a central opening having a treaded surface configured to communicate threadingly with a spindle having an external threaded surface, the nut further comprising an outer wall configured to interface with interior surface of the sleeve having the non-circular cross-section, such that the nut is restrained from freely rotating relative to the sleeve, and the outer wall of the nut configured to move longitudinally within the sleeve in a direction substantially parallel to the central axis, and the nut further comprising a first end located proximal the front wall, and the first end having a piston contact surface which contacts a nut contact surface on an inner surface of the front wall;
the nut configured such when the spindle is turned in a first direction, the nut moves in a linear direction substantially parallel to the central axis toward the front wall, and the piston contact surface pushes against the nut contact surface and piston contact surface.

3. The disk brake piston system of claim 2 , wherein the nut contact surface being located on curved area of the front wall, and when the spindle is turned in a first direction, the curved area of the front wall partially compresses.

4. The disk brake piston system of claim 3 , wherein the brake piston system is in operational communication with a disk brake system comprising a brake pad, and the disk brake piston system is configured to apply an actuating force to the brake pad, and upon a decrease in a temperature of the brake system, the dome partially decompresses with the piston continuing to apply an actuating force to the brake pad.

5. The disk brake piston system of claim 4 , wherein the disk brake system further comprises a rotor.

6. The disk brake piston system of claim 2 , wherein nut outer wall comprises a series of flat surfaces positioned around the circumference of the outer wall of the nut and each of the flat surfaces communicates operably with a corresponding flat surface located on the inner surface of the sleeve.

7. The disk brake piston system of claim 6 , further comprising a series of holes in the outer wall of the nut, each hole associated with a flat surface, and each of the hole positioned to create an opening from the a side of the outer wall of the nut facing the front wall to a side of the outer wall of the nut facing opposite the front wall.

8. The disk brake piston system of claim 2 further comprising a hole in the outer wall of the nut, the hole positioned to create an opening from the a side of the outer wall of the nut facing the front wall to a side of the outer wall of the nut facing opposite the front wall.

9. The disk brake piston system of claim 8 , wherein the hole is on an edge of the outer wall of the nut.

10. The disk brake piston system of claim 2 , the piston further comprises sleeve non-rotation points on the inner surface of the outer wall of the piston, the sleeve non-rotation points are configured to resist relative rotation between the sleeve and the piston.

11. The disk brake piston system of claim 10 , wherein the sleeve non-rotation points comprise one or more grooves, lands, high points, low points, surface roughening, and/or holes.

12. The disk brake piston system of claim 2 , wherein the piston is configured to apply an actuating force to a brake pad in operational communication with the piston.

13. The disk brake piston system of claim 1 , wherein the polymeric material is selected from the group consisting of thermosetting and thermoplastic polymers.

14. The disk brake piston system of claim 13 , wherein the polymeric material is a phenolic polymer.

15. The disk brake piston system of claim 13 , wherein the polymeric material is a crosslinked phenolic polymer.

16. The disk brake piston of claim 1 , wherein the flat or curved internal surface comprises a series of linked flat surfaces forming a polygon surrounding the central axis.

17. The disk brake piston of claim 1 , wherein the sleeve does not extend to the front wall.

18. The disk brake piston system of claim 1 , wherein the curved area is formed substantially at a center of the front wall.

Assignees

• Mando Corp

Inventors

• Demorais Antonio Eduardo
• Smith Daniel
• Lim Sangyong

Classifications

• B60T1/065

  employing disc (B60T1/062 takes precedence) · CPC title

• F16D65/005

  Components of axially engaging brakes not otherwise provided for · CPC title

• F16D2200/0034

  non-metallic · CPC title

• F16D2121/14

  Mechanical · CPC title

• F16D2200/0004

  metallic · CPC title