Sensor Device and Disc Brake Comprising a Sensor Device

Patent metadata

Field	Value
Publication number	US-2016258501-A1
Application number	US-201615155291-A
Country	US
Kind code	A1
Filing date	May 16, 2016
Priority date	Nov 20, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

A sensor device for a disc brake has a sensor gearing which can be coupled to at least one encoder, wherein the sensor gearing is arranged in a housing as a planetary gear mechanism and has an input for a first variable, which can be detected by the sensor device and which is associated with wear of the disc brake, and has an input for a second variable, which can be detected by the sensor device and which is associated with an operating movement of the disc brake. The sensor device can be changed over from a first state for detecting the first variable, which is associated with wear of the disc brake, and the second variable, which is associated with an operating movement of the disc brake, to a second state for detecting only the first variable, which is associated with wear of the disc brake.

First claim

What is claimed is:

1 . A sensor device for a disc brake, comprising:
a sensor gearing coupleable to at least one encoder; a housing in which is arranged the sensor gearing, the sensor gearing being a planetary gearing having an input for a first variable to be detected by the sensor device and an input for a second variable to be detected by the sensor device, wherein the first variable is associated with wear of the disc brake and the second variable is associated with an actuation stroke of the disc brake, the sensor device is configured to be convertible from a first state for detecting the first variable associated with the wear of the disc brake and the second variable associated with the actuation stroke of the disc brake, into a second state for detecting only the first variable associated with the wear of the disc brake.

2 . The sensor device according to claim 1 , wherein:
the input for the first variable to be detected is a sun gear of the sensor gearing, and the input for the second variable to be detected is a planet carrier of the sensor gearing having a planet carrier toothing.

3 . The sensor device according to claim 2 , wherein:
in the first state of the sensor device, the input for the second variable to be detected is in engagement with a stroke sensor drive unit, and in the second state of the sensor device, the input for the second variable is blocked.

4 . The sensor device according to claim 3 , wherein
the stroke sensor drive unit comprises at least one toothed gear which, in the first state of the sensor device, engages with the planet carrier toothing in an opening of the housing, wherein the planet carrier toothing is an external toothing.

5 . The sensor device according to claim 4 , wherein the at least one toothed gear is rotatably mounted, and is axially delimited, in a bracket and in the housing.

6 . The sensor device according to claim 5 , wherein the bracket is fastened removably to the housing.

7 . The sensor device according to claim 3 , wherein:
the input for the second variable to be detected is, in the second state of the sensor device, rotationally fixedly blocked by at least one fixing tooth of a bracket connected rotationally fixedly to the housing, and the at least one fixing tooth is in engagement with the planet carrier toothing in an opening of the housing, wherein the planet carrier toothing is an external toothing.

8 . The sensor device according to claim 7 , wherein the bracket is fastened removably to the housing.

9 . The sensor device according to claim 1 , wherein:
the input for the first variable to be detected is a drive shaft having at least one gearing stage coupled to a sun gear of the sensor gearing, and the input for the second variable to be detected is a planet carrier of the sensor gearing having a planet carrier toothing.

10 . The sensor device according to claim 9 , wherein:
in the first state, the input for the second variable to be detected is in engagement with a stroke sensor drive unit or is provided for direct engagement of a stroke sensor actuator of an associated disc brake, and in the second state, the input for the second variable to be detected is blocked.

11 . The sensor device according to claim 10 , wherein:
in the second state, the input for the second variable to be detected is rotationally fixedly blocked by at least one fixing arm, and the at least one fixing arm is in engagement with the planet carrier toothing, which planet carrier toothing is an external toothing.

12 . The sensor device according to claim 11 , wherein
the at least one fixing arm is fastened removably to the housing or is connected severably to the housing via a predetermined breaking section.

13 . The sensor device according to claim 11 , wherein
the at least one fixing arm is an insert part that is insertable rotatably fixedly into, and removable from, the housing.

14 . The sensor device according to claim 1 , further comprising the at least one encoder, wherein the at least one encoder is coupled to the sensor gearing.

15 . A disc brake for a motor vehicle, comprising:
a brake-application apparatus having a spreading mechanism; a wear-compensating readjustment apparatus having at least one mechanical readjustment device coupled to the spreading mechanism; and a sensor device for the disc brake, the sensor device comprising: a sensor gearing coupleable to at least one encoder; a housing in which is arranged the sensor gearing, the sensor gearing being a planetary gearing having an input for a first variable to be detected by the sensor device and an input for a second variable to be detected by the sensor device, wherein the first variable is associated with wear of the disc brake and the second variable is associated with an actuation stroke of the disc brake, the sensor device is configured to be convertible from a first state for detecting the first variable associated with the wear of the disc brake and the second variable associated with the actuation stroke of the disc brake, into a second state for detecting only the first variable associated with the wear of the disc brake, the input for the first variable to be detected is coupled to the at least one mechanical readjustment device, and the input for the second variable to be detected is coupled to the spreading mechanism via a stroke sensor drive.

16 . The disc brake according to claim 15 , wherein:
the spreading mechanism is a brake rotary lever and the disc brake comprises at least two spindle units with the mechanical readjustment device being insertable into a respective one or the two spindle units, the mechanical readjustment device is coupled to a driver via a synchronization unit, and the input for the first variable to be detected is coupled to a driver shaft of the driver.

17 . The disc brake according to claim 16 , wherein the stroke sensor drive has an angular gearing.

18 . The disc brake according to claim 17 , wherein the stroke sensor drive having the angular gearing comprises a stroke sensor actuator with a crown gear toothing.

19 . The disc brake according to claim 15 , wherein an axial offset between a plane of a lever pivot axis of a brake rotary lever forming the spreading mechanism and a plane of a sensor axis of the sensor device is compensated via a gearing stage of the stroke sensor drive.

20 . The disc brake according to claim 15 , wherein
the sensor device is arranged in the disc brake such that an axial offset between a plane of a lever pivot axis of the brake rotary lever, in which a sensor axis of the sensor device lies, and a plane of an axis of a spindle unit is compensated by a gearing stage of a drive unit which is an input for the first variable to be detected.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Staahl Christian
• Klingner Matthias
• Peschel Michael

Classifications

• F16D66/026

  indicating different degrees of lining wear · CPC title

• F16D65/568 Primary

  for synchronous adjustment of actuators arranged in parallel · CPC title

• F16D55/225

  the braking members being brake pads · CPC title

• F16D2066/003

  Position, angle or speed · CPC title

• F16D66/02

  Apparatus for indicating wear · CPC title