Disc brake for a commercial vehicle and brake pad set

Patent metadata

Field	Value
Publication number	US-10670091-B2
Application number	US-201715844186-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Jun 15, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A disc brake includes a brake caliper that engages over a brake disc, the caliper having a central opening over the brake disc. The disc brake has two brake pads which are located in the brake caliper, can be moved in opposite directions and each of which has a pad backing plate with a friction lining secured thereon. An action-side or application-side brake pad of the two brake pads can be pressed against the brake disc by a brake application device with the aid of at least one brake plunger. The brake also has at least one restoring device, by which the brake caliper can be returned. The restoring device has a spreading device which engages on the brake pads lying opposite one another and which acts with an identical force in opposition to the respective application direction. The spreading device has spring-loaded spreading elements, each engaging on its respective pad backing plate. The spreading device is located in the central opening and the spreading elements engage directly or indirectly, outside the friction linings, on at least two contact regions of the brake pads. These regions face each other at a distance from the center. The spreading device has spring-loaded arms which are interconnected in the central region of the opening and connected to a retaining bracket which is attached to the brake support plate.

First claim

What is claimed is:

1. A disc brake for a commercial vehicle, comprising:
a brake caliper which engages over a brake disc and which is in the form of a sliding caliper and which is fastened to a positionally static brake carrier and which has a central opening over the brake disc,
two brake pads which are arranged in the brake caliper and which are movable in opposite directions, each of the two brake pads having a pad carrier plate and a friction pad fastened thereto, wherein an action-side or application-side brake pad is pressable against the brake disc by way of an application device via at least one brake plunger, and
at least one resetting device by which the brake caliper is resettable after a braking-induced displacement and release of the brake, wherein
the resetting device has a spreading device which engages on the opposite brake pads and which acts equally counter to the respective application direction and which has resilient spring arms which engage on the respective pad carrier plates,
the spreading device is arranged in the central opening,
the spring arms engage, outside the friction pads, directly or indirectly, on at least two abutment regions of each pad carrier plate, which abutment regions are arranged spaced apart from one another relative to the center, so as to reset the two brake pads counter to an application direction,
the spring arms, in a central region of the central opening, are connected to one another and to a retaining bow which is attached to the brake carrier,
the spring arms are connected by a retaining stirrup to the retaining bow, and
the retaining stirrup has two retaining arms, each of which extends beyond the retaining bow and is fixedly connected to the retaining bow.

2. The disc brake as claimed in claim 1 , wherein
the spring arms extend, proceeding from the central region in the central opening, from the inside to the outside to the abutment regions which are arranged spaced apart from one another uniformly relative to the center.

3. The disc brake as claimed in claim 2 , wherein
the central region of the central opening extends to both sides of a virtual center of the opening approximately parallel to the plane of the brake disc over a length in a range from 30 to 50% of a longitudinal axis of the opening.

4. The disc brake as claimed in claim 1 , wherein
in each case, two spring arms bear against an associated pad carrier plate by way of in each case one thrust section of each spring arm.

5. The disc brake as claimed in claim 1 , wherein
the retaining bow is arranged in the region of an application-side edge of the opening.

6. The disc brake as claimed in claim 5 , wherein
the retaining bow is attached in a positionally static manner between the brake carrier and bearing beams of the brake caliper.

7. The disc brake as claimed in claim 6 , wherein
the retaining bow has at least one fastening section with an opening which is arranged coaxially with respect to a bearing receptacle of the brake carrier, to which the brake caliper is fastened by a bearing beam.

8. The disc brake as claimed in claim 1 , wherein
the spring arms are formed as two pairs of spring arms,
the pairs are arranged opposite one another in a longitudinal direction of the opening such that they are fastened by way of inner ends, which are in each case connected by a connecting section, in the central region of the central opening to the retaining stirrup, wherein their outer free ends interact with the pad carrier plates of the brake pads.

9. The disc brake as claimed in claim 8 , wherein
the retaining arms of the retaining stirrup have elongated holes at fastening points to the retaining bow.

10. The disc brake as claimed in claim 4 , wherein
each spring arm is formed, at the end, with a thrust section which, in its longitudinal direction, is formed with an elongated hole which is a guide section of the spring arm of the spreading device.

11. The disc brake as claimed in claim 10 , wherein
each thrust section lies in each case on a bearing surface of a respective pad carrier plate, and
the elongated holes of each thrust section interact in each case with a projection of the pad rear plate.

12. The disc brake as claimed in claim 1 , wherein
the spreading device has at least one additional resetting element which, in addition to the engagement point/the engagement points of the spring arms, engages at a further engagement point on the respective pad carrier plate of a brake pad.

13. The disc brake as claimed in claim 12 , wherein
the at least one additional resetting element is fastened by the retaining stirrup to the retaining bow.

14. The disc brake as claimed in claim 12 , wherein
the at least one additional resetting element is attached to a pad retaining stirrup.

15. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element makes contact, by way of a thrust section, with a pad side of the pad carrier plate of a brake pad.

16. The disc brake as claimed in claim 15 , wherein
the at least one additional resetting element makes contact, by way of its thrust section, with the pad side of the pad carrier plate of the brake pad in a lower region of the pad carrier plate.

17. The disc brake as claimed in claim 16 , wherein
the at least one additional resetting element makes contact, by way of its thrust section, with the pad side of the pad carrier plate of the brake pad in a slot in the friction pad.

18. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element, by way of a thrust section, makes contact with a thrust side of the pad carrier plate of a brake pad or engages with a retaining section of said thrust side.

19. The disc brake as claimed in claim 18 , wherein
the at least one additional resetting element has a spring arm which forms a spring in a plane parallel to the brake disc.

20. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element is arranged with an upper retaining end in an opening of the pad retaining stirrup on an application-side wall of the opening, and makes contact, by way of a lower thrust section, with a thrust side of the pad carrier plate of a rear-side brake pad.

21. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element is a spring arm, the upper end of which is attached via a spring coil with a fastening section to an application-side retaining end of the pad retaining stirrup, and a lower end of the spring arm, which is connected via a further spring coil with a clamping end, and
the clamping end engages with a retaining section on the thrust side of the pad carrier plate of the application-side brake pad.

22. The disc brake as claimed in claim 21 , wherein
the spring coils are formed as spiral springs with parallel longitudinal axes which run tangentially with respect to the brake disc.

23. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element is attached to an application-side retaining end of the pad retaining stirrup and has a spring arm which is connected to a spring unit which in turn engages with a retaining section on the thrust side of the pad carrier plate of the application-side brake pad.

24. The disc brake as claimed in claim 14 , wherein
the at least one additional resetting element is a spring unit which is attached to a base

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Fricke Jens
• Rguichi Abdelaziz
• Eichler Thomas
• Krause Oliver
• Klinger Matthias
• Peschel Michael
• Schoefberger Tobias
• Adamczyk Philipp
• Molnar Markus
• Hauser Maximilian
• Nesmjanowitsch Igor
• Heindl Martin
• Brandl Christian
• Pleintinger Martin
• Roth Natalie
• Sakel Kerstin
• Gasslbauer Franz
• Tropp Martin
• Asen Alexander

Classifications

• F16D65/0068

  Brake calipers · CPC title

• F16D65/097 Primary

  Resilient means interposed between pads and supporting members {or other brake parts} · CPC title

• F16D2055/0029

  Retraction devices · CPC title

• F16D55/226 Primary

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

• F16D65/0977

  Springs made from sheet metal · CPC title