Disc brake for utility vehicles

Patent metadata

Field	Value
Publication number	US-10851857-B2
Application number	US-201916296983-A
Country	US
Kind code	B2
Filing date	Mar 8, 2019
Priority date	Sep 9, 2016
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A disc brake for utility vehicles includes a brake disc, a brake caliper spanning the brake disc, a brake carrier, and an application-side brake pad and a reaction-side brake pad, of which at least the application-side brake lining is accommodated in a lining slot of the brake carrier. The brake caliper houses a brake application device having a single pressure plunger arranged to exert a brake application force on the application-side brake lining via a pressure plate. The brake is configured with one or both of an operative plane of the pressure plate being offset in the direction of the exit side at a distance from a plane of symmetry of the disc brake, and a bevel on the exit side of at least the application-side brake lining.

First claim

What is claimed is:

1. A disc brake for utility vehicles, comprising:
a brake disc;
a brake caliper spanning the brake disc;
a brake carrier arranged to support the brake caliper over the brake disc;
an application-side brake pad;
a reaction-side brake pad; and
an application device located in the brake caliper, the application device including a single piston configured to exert an application force on the application-side brake pad via a pressure plate,
wherein
at least the application-side brake pad is accommodated in a pad cavity of the brake carrier,
the brake caliper has a central plane parallel to a rotation axis of the brake disc, and an entry side and an exit side relative to a direction of rotation of the brake disc,
the disc brake is arranged with one or more of
an action plane of the pressure plate against the application-side brake pad being offset to the exit side at a distance from the central plane, and
at least the application-side brake pad has a bevel on an exit side,

the pressure plate has a geometry which is asymmetric relative to the central plane, and
the asymmetric pressure plate is oval-shaped.

2. The disc brake as claimed in claim 1 , wherein
the brake carrier is formed as a frame that spans the brake disc and receives the application-side brake pad and the reaction-side brake pad.

3. The disc brake as claimed in claim 1 , wherein
an entry-side shoulder of a carrier plate of the application-side brake pad engages in an entry-side recess of the brake carrier.

4. The disc brake as claimed in claim 1 , wherein
the pressure plate is integrally formed with the piston.

5. The disc brake as claimed in claim 1 , wherein
the piston is guided in the central plane of the disc brake.

6. The disc brake as claimed in claim 1 , wherein
at least a portion of the asymmetric pressure plate includes the action plane and offset relative to the central plane in the direction of the exit side.

7. The disc brake as claimed in claim 1 , wherein
the application-side brake pad and the reaction-side brake pad each include a carrier plate and a friction lining carried by the carrier plate.

8. The disc brake as claimed in claim 1 , wherein
the disc brake includes both of the action plane of the pressure plate being offset from the central plane toward the exit side and the bevel on the exit side of the application-side brake pad,
the friction lining includes the exit-side bevel, and
configured such that the exit-side bevel of the friction lining creates an asymmetric friction lining friction surface having a centroid offset toward the entry side of the central plane, such that the offset centroid of the friction lining friction surface and the offset pressure plate cooperate during brake application to generate a correction moment against the rotation direction of the brake disc counter to a servo moment generated by application of the friction lining against the brake disc.

9. The disc brake as claimed in claim 8 , wherein
the bevel is configured such that when the friction lining is unworn, the amount of offset of the friction lining friction surface centroid over-compensates for the servo moment, and
during a wear life of the brake pad a diminishing thickness of the friction lining causes the friction lining friction surface centroid offset to decrease such that the amount of offset under-compensates for the servo moment.

10. The disc brake as claimed in claim 9 , wherein
a degree of over-compensation is between 70% and 30% above the servo moment, and
a degree of under-compensation is preferably between 70% and 30% below the servo moment MS.

11. The disc brake as claimed in claim 9 , wherein
a degree of over-compensation is between 55% and 45% above the servo moment, and
a degree of under-compensation is preferably between 55% and 450% below the servo moment MS.

12. The disc brake as claimed in claim 8 , wherein
the bevel is configured such that a first part of the bevel at least partially compensates for the servo moment, and a second part at least partially compensates for an effect of friction force of the brake pad carrier plate on the brake carrier.

13. The disc brake as claimed in claim 1 , wherein
a distance between the action plane and the central plane is between 0 mm and 10 mm.

14. The disc brake as claimed in claim 1 , wherein
a distance between the action plane and the central plane is between 2 mm and 4 mm.

15. The disc brake as claimed in claim 14 , wherein
the distance is dimensioned such the offset pressure plate reduces an amount of diagonal wear of the friction lining caused by a friction moment.

16. The disc brake as claimed in claim 8 , wherein
the bevel of the friction lining meets the carrier plate at a distance spaced from an exit side of the backing plate corresponding to a residual friction lining thickness at which the brake pad is to be replaced.

17. The disc brake as claimed in claim 8 , wherein
the bevel is at an angle relative to the friction lining friction surface of between 10° and 30°.

18. The disc brake as claimed in claim 8 , wherein
the bevel is at an angle relative to the friction lining friction surface of between 15° and 25°.

19. The disc brake as claimed in claim 8 , wherein
the bevel is at an angle relative to the friction lining friction surface of between 30° and 65°.

20. The disc brake as claimed in claim 8 , wherein
the bevel is at an angle relative to the friction lining friction surface of between 50° and 65°.

21. A vehicle, comprising:
at least one disc brake, the disc brake including
a brake disc;
a brake caliper spanning the brake disc;
a brake carrier arranged to support the brake caliper over the brake disc;
an application-side brake pad;
a reaction-side brake pad; and
an application device located in the brake caliper, the application including a single piston configured to exerts an application force on the application-side brake pad via a pressure plate,
wherein
at least the application-side brake pad is accommodated in a pad cavity of the brake carrier,
the brake caliper has a central plane parallel to a rotation axis of the brake disc, and an entry side and an exit side relative to a direction of rotation of the brake disc,
the disc brake is arranged with one or more of
an action plane of the pressure plate against the application-side brake pad being offset to the exit side at a distance from the central plane, and
at least the application-side brake pad has a bevel on an exit side,

the pressure plate has a geometry which is asymmetric relative to the central plane, and
the asymmetric pressure plate is oval-shaped.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Baumgartner Johann
• Petschke Andreas

Classifications

• F16D2065/026

  characterised by a particular outline shape of the braking member, e.g. footprint of friction lining · CPC title

• F16D65/18

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• F16D65/0971

  transmitting brake actuation force, e.g. elements interposed between brake piston and pad · CPC title

• F16D55/226 Primary

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