Device for recognizing wear of a brake pad of a disc brake

Patent metadata

Field	Value
Publication number	US-11725706-B2
Application number	US-202117494196-A
Country	US
Kind code	B2
Filing date	Oct 5, 2021
Priority date	Oct 6, 2020
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A wear indication device ( 10 ) for a vehicle brake ( 1 ), preferably a disc brake of a commercial vehicle, for indicating a wear condition of a brake pad ( 20 ) comprising: a fixing section ( 12 ) for fixing the wear indication device ( 10 ) to a brake pad back plate ( 30 ), a sensor head ( 14 ) associated to the fixing section ( 12 ), and a channel ( 16 ) for receiving a signal cable ( 40 ) within the sensor head ( 14 ). According to the invention, the channel ( 16 ) is configured to receive two signal cables ( 40′, 40 ″).

First claim

What is claimed is:

1. A wear indication device ( 10 ) for a vehicle brake ( 1 ) for indicating a wear condition of a brake pad ( 20 ), the wear indication device comprising:
a fixing section ( 12 ) for fixing the wear indication device ( 10 ) to a brake pad back plate ( 30 ),
a sensor head ( 14 ) associated with the fixing section ( 12 ), and
a channel ( 16 ) defined within the sensor head ( 14 ) for receiving a signal cable ( 40 ),
wherein the channel ( 16 ) is sized and configured to receive two signal cables ( 40 ′, 40 ″);
wherein the channel extends fully through the sensor head in a direction parallel to the two signal cables;
wherein the channel ( 16 ) is a double channel having a first section ( 102 ) for the first cable ( 40 ′), and a second section ( 104 ) for the second cable ( 40 ″), wherein the first and second sections ( 102 , 104 ) are positioned adjacent to each other radially with respect to center axes thereof; and
wherein the center axis of the first section for the first signal cable ( 40 ′) has a distance to the fixing section ( 12 ) that is greater than a distance between the center axis of the second section for the second signal cable ( 40 ″) and the fixing section ( 12 ).

2. The wear indication device ( 10 ) according to claim 1 ,
wherein the respective cross-sections of the first and the second sections ( 102 , 104 ) at least partially overlap in a direction extending perpendicular to the back plate, such that the channel ( 16 ) includes a narrow necking area ( 106 ) partly separating the first section ( 102 ) from the second section ( 104 ) by way of at least one protrusion ( 108 ) in the sensor head ( 14 ) projecting inwardly into the double channel.

3. The wear indication device ( 10 ) according to claim 1 , wherein at least one of the first section ( 102 ) or the second section ( 104 ) of the double channel has at least a partly circular cross-section.

4. The wear indication device ( 10 ) according to claim 1 , wherein the double channel has a geometry such that the two signal cables ( 40 ′, 40 ″) are arranged at least partially in parallel to each other in direct contact or at a distance from each other when arranged within the channel ( 16 ).

5. The wear indication device ( 10 ) according to claim 1 , wherein the wear indication device ( 10 ) further comprises a substantially flat contact surface for contacting a brake pad back plate ( 30 ) when the wear indication device ( 10 ) is installed, said contact surface defining a zero plane (Z) having an axial axis (A) orthogonal to the plane.

6. The wear indication device ( 10 ) according to claim 5 , wherein a center axis of the first signal cable ( 40 ′) has a distance to the zero plane (Z) that is greater than a distance between the center axis of the second signal cable ( 40 ″) and the zero plane (Z) in the direction of the axial axis (A) when arranged within the channel.

7. The wear indication device ( 10 ) according to claim 5 , wherein the center axes of the first and second signal cables ( 40 ′, 40 ″) define a plane perpendicular to the zero plane (Z) when arranged within the channel.

8. The wear indication device ( 10 ) according to claim 5 , wherein the channel ( 16 ) and the signal cables ( 40 ′, 40 ″), when arranged within the channel, extend at least partially parallel to the zero plane (Z).

9. The wear indication device ( 10 ) according to claim 1 , wherein the channel ( 16 ) has a geometry such that the two signal cables ( 40 ′, 40 ″) are in contact when arranged within the channel, so that the two signal cables have the smallest possible distance from each other within the channel ( 16 ).

10. The wear indication device ( 10 ) according to claim 1 , wherein the sensor head ( 14 ) is formed of a plastic material.

11. A wear indication device ( 10 ) for a vehicle brake ( 1 ) for indicating a wear condition of a brake pad ( 20 ), the wear indication device comprising:
a fixing section ( 12 ) for fixing the wear indication device ( 10 ) to a brake pad back plate ( 30 ),
a sensor head ( 14 ) associated with the fixing section ( 12 ), and
a channel ( 16 ) defined within the sensor head ( 14 ) for receiving a signal cable ( 40 ),
wherein the channel ( 16 ) is sized and configured to receive two signal cables ( 40 ′, 40 ″);
wherein the channel extends fully through the sensor head in a direction parallel to the two signal cables;
wherein the wear indication device ( 10 ) further comprises a substantially flat contact surface for contacting a brake pad back plate ( 30 ) when the wear indication device ( 10 ) is installed, said contact surface defining a zero plane (Z) having an axial axis (A) orthogonal to the plane;
wherein the channel ( 16 ) has a geometry such that the two signal cables ( 40 ′, 40 ″) are arranged perpendicular to the axial axis (A) when arranged within the channel ( 16 ).

12. A vehicle brake ( 1 ), comprising:
a brake pad back plate ( 30 ) for carrying a brake pad ( 20 ),
a wear indication device ( 10 ) configured for indicating a wear condition of the brake pad ( 20 ), the wear indication device ( 10 ) including:
a fixing section ( 12 ) that fixes the wear indication device ( 10 ) to the brake pad back plate ( 30 ),
a sensor head ( 14 ) associated with the fixing section ( 12 ), and
a channel ( 16 ) defined within the sensor head ( 14 ) for receiving a signal cable ( 40 ),
wherein the channel ( 16 ) is sized and configured to receive two signal cables ( 40 ′, 40 ″), wherein the two signal cables extend through the channel parallel to each other;
wherein the channel extends fully through the sensor head in a direction parallel to the two signal cables;
wherein the channel ( 16 ) is arranged outside of the brake pad back plate ( 30 ) and within the brake pad ( 20 ).

13. The vehicle brake ( 1 ) according to claim 12 , wherein an end of the channel ( 16 ) closest to the brake pad back plate ( 30 ) is located at a distance from the brake pad back plate ( 30 ) that is 1 mm or less.

14. The vehicle brake ( 1 ) according to claim 12 , wherein the sensor head ( 14 ) is at least partially arranged in a cut-out ( 110 ) within the brake pad ( 20 ).

15. The vehicle brake ( 1 ) according to claim 12 , wherein the channel ( 16 ) is a double channel having a first section ( 102 ) for the first cable ( 40 ′), and a second section ( 104 ) for the second cable ( 40 ″), wherein the first and second sections ( 102 , 104 ) are positioned adjacent to each other radially with respect to center axes thereof.

16. The vehicle brake ( 1 ) according to claim 15 , wherein the respective cross-sections of the first and the second sections ( 102 , 104 ) at least partially overlap in a direction perpendicular to the back plate, such that the channel ( 16 ) includes a narrow necking area ( 106 ) partly separating the first section ( 102 ) from the second section ( 104 ) by way of at least one protrusion ( 108 ) in the sensor head ( 14 ) projecting inwardly into the double channel.

17. The vehicle brake ( 1 ) according to claim 15 , wherein the center axis of first section for the first signal cable ( 40 ′) has a distance to the fixing section ( 12 ) that is greater than a distance between the center axis of the second section for the second signal cable ( 40 ″) and the fixing section ( 12 ).

Assignees

• Zf Cv Systems Europe Bv

Inventors

• Strzala Wieslaw

Classifications

• F16D66/024 Primary

  Sensors mounted on braking members adapted to contact the brake disc or drum, e.g. wire loops severed on contact · CPC title

• F16D2066/001

  Temperature · CPC title

• F16D66/021 Primary

  using electrical detection or indication means · CPC title

• F16D65/095

  Pivots or supporting members therefor · CPC title