BRAKE DEVICE

Abstract

A brake device for braking a wheel, having a brake drum, a brake carrier for shifting a brake lining in order to press the brake lining against the brake drum, a sensor for sensing a rotational speed of the wheel, and an adjustment element configured to be coupled to the sensor and to spatially adjust the sensor.

Claims

1.-13. (canceled)

14. A brake device for braking a wheel, comprising: a brake drum; a brake carrier configured to shift a brake lining with respect to the brake drum; a sensor configured to detect a rotational speed of the wheel; and an adjustment element configured to be engaged with the sensor to spatially shift the sensor, wherein the adjustment element comprises a sleeve and accommodates a cable element of the sensor.

15. The brake device as claimed in claim 14, wherein the adjustment element is configured to transmit a pressure force to the sensor.

16. The brake device of claim 15, wherein the adjustment element is rigid.

17. The brake device as claimed in claim 15, wherein the adjustment element forms an integral part of a cable sleeve.

18. The brake device as claimed in claim 17, wherein the adjustment element has a length which corresponds to at least a distance of the sensor from an outer side of the brake device.

19. The brake device as claimed in claim 18, wherein the adjustment element is accessible from outside the brake drum.

20. The brake device as claimed in claim 19, wherein the adjustment element projects out of an interior space of the brake drum.

21. The brake device as claimed in claim 20, wherein the adjustment element at least one of projects through and mounted in an opening in a closure plate of the brake device.

22. The brake device as claimed in claim 21, wherein the adjustment element comprises at least one of metal and plastic.

23. The brake device as claimed in claim 22, wherein the adjustment element has a longitudinal axis which runs along a sensor longitudinal axis.

24. The brake device as claimed in claim 23, wherein the sensor is configured to be plugged axially into a sensor mount.

25. The brake device as claimed in claim 24, wherein the sensor is configured to be adjusted in an axial direction by the adjustment element.

26. The brake device as claimed in claim 25, wherein the adjustment element includes an indicator in the region of an end pf the adjustment element.

27. The brake device as claimed in claim 26, wherein the indicator is in the region of the part projecting of the closure plate.

28. The brake device as claimed in claim 14, wherein the adjustment element forms an integral part of a cable sleeve.

29. The brake device as claimed in claim 14, wherein the adjustment element has a length which corresponds to at least a distance of the sensor from an outer side of the brake device.

30. The brake device as claimed in claim 14, wherein the adjustment element is accessible from outside the brake drum.

31. The brake device as claimed in claim 14, wherein the adjustment element projects out of an interior space of the brake drum.

32. The brake device as claimed in claim 14, wherein the adjustment element at least one of projects through and mounted in an opening in a closure plate of the brake device.

33. The brake device as claimed in claim 14, wherein the adjustment element comprises at least one of metal and plastic.

34. The brake device as claimed in claim 14, wherein the adjustment element has a longitudinal axis which runs along a sensor longitudinal axis.

35. The brake device as claimed in claim 14, wherein the sensor is configured to be plugged axially into a sensor mount.

36. The brake device as claimed in claim 14, wherein the sensor is configured to be adjusted in an axial direction by the adjustment element.

37. The brake device as claimed in claim 14, wherein the adjustment element includes an indicator in the region of an end of the adjustment element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention will be described further below with reference to a preferred embodiment which is illustrated schematically in the appended figure. In the drawing:

[0020] FIG. 1 shows a cross-sectional view of a brake device according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The brake device 10 comprises a brake drum 20 which is rotatably mounted on an axle element 12. The axle element 12 extends along a longitudinal axis which is characterized by the reference symbol 14 in the figure. The axle element 12 can be, for example, a fixed, that is to say non-rotating, axle of a vehicle, in particular of a utility vehicle.

[0022] In order to mount the brake drum 20 in a rotating fashion relative to the axle element 12, bearing devices 22, for example roller bearings, are provided. A wheel hub 26 is mounted on the bearing devices 22 in such a way that it can rotate relative to the axle element 12. The brake drum 20 is fixedly connected to the wheel hub 26, with the result that it can rotate together with the wheel hub 26 about the axle element 12. In order to connect the wheel hub 26 and brake drum 20 in a rotationally fixed fashion, attachment bolts 28 are provided. However, instead of the bolts 28, other attachment devices can also be provided.

[0023] The brake drum 20 is shaped in the form of a drum and comprises a drum ring 21 which extends in the axial direction and in the circumferential direction around the axle element 12 and surrounds or bounds an interior space 24 of the drum.

[0024] A brake carrier 30 which is fixedly connected to the axle element 12 is arranged in the interior space 24 of the drum, that is to say inside the brake drum 20. The brake carrier 30 bears a brake lining carrier 32 which cannot be seen in the sectional view and is indicated only schematically. The brake lining carrier 32 is provided on its face lying radially on the outside with brake linings 34 (also indicated only schematically) which, when the brake device 10 is activated, press against a circumferential face, lying on the inside, of the brake drum 20. In order to shift the brake lining carrier 32 radially, an activation device 36 is provided, for example an expansion wedge unit. The activation device 36 can usually be operated hydraulically and can for this purpose have a hydraulic cylinder.

[0025] The interior space 24 of the drum is closed off, in particular in order to protect against soiling, by a closure plate 40 which is arranged in a non-rotating fashion on the axle element 12. The closure plate 40 is located on an axial end face of the interior space 24 of the drum, which end face is turned toward the center of the vehicle in the mounted state of the brake device 10. The closure plate 40 can be considered to be part of the brake carrier 30 and can be embodied in an integral fashion therewith, for example as a cast part. The closure plate 40 is located, in particular, at an open end of the brake drum 20.

[0026] A pole wheel 58 is arranged on the rotating components of the brake device 10, in particular on the wheel hub 26. The pole wheel 58 is mounted so as to be rotatable relative to the axle element 12 and rotates together with the brake drum 20 or the wheel hub 26. Said pole wheel 58 comprises, in a basically known fashion, a multiplicity of webs and openings in the circumferential direction which can be detected by means of a sensor 50, in particular an optical sensor. The sensor 50 is for this purpose arranged in a positionally fixed fashion relative to the axle element 12 and is attached, for example, to the brake carrier 30. When the brake drum 20 rotates about the axle element 12, the sensor 50 can determine the rotational speed in a basically known fashion by measuring the speed of the grill rods and/or openings of the pole wheel 58 which pass the sensor 50. The sensor 50 comprises a sensor housing 52 which is accommodated in a sensor mount 54. A longitudinal axis or central axis of the sensor 50, which axis is referred to as a sensor longitudinal axis 56, runs in an axial direction of the axle element 12, in particular parallel to the longitudinal axis 14. The sensor 50 can be plugged into the sensor mount 54 along the sensor longitudinal axis 56 and can be pressed as far as a stop. The position of the sensor 50 which is illustrated in FIG. 1 is referred to as the operating position. In this position, it is possible to measure the rotational speed of the wheel or of the brake drum 20 around the axle element 12.

[0027] A functional fault can occur as a result of undesired shifting of the sensor 50 away from the pole wheel 58, that is to say in the direction toward the right in FIG. 1, and measurement of the rotational speed is therefore no longer possible. This position is referred to as fault position. In order to move the sensor 50 from its fault position to the operating position, an adjustment element 60 is provided which is connected to, or can be engaged with, the sensor 50, in particular the sensor housing 52. The adjustment element 60 runs out of the interior space 24 of the drum, starting from the sensor 50 arranged in the interior space 24 of the drum. In this context, said adjustment element 60 extends through the closure plate 40, in which an opening 42 is formed for this purpose. The adjustment element 60 is embodied in the form of a sleeve or rod and is, in particular, an elongate element which extends in the axial direction of the brake device 10, preferably parallel to the longitudinal axis 14. An electrical or optical cable element 62 preferably runs in the adjustment element 60, with the result that the adjustment element 60 forms a sheath of the cable element 62. The cable element 62 can project out of the adjustment element 60 at the end lying opposite the sensor 50. So that the sensor 50 can be pressed on in the direction of the pole wheel 58 via the adjustment element 60, the adjustment element 60 is configured in a stiff or rigid fashion and preferably runs along a straight line, in particular coaxially with respect to the sensor longitudinal axis 56. When the brake device 10 is mounted, the adjustment element 60 is accessible, in particular from outside the closure plate 40 which closes off the interior space 24 of the drum. For this purpose, the adjustment element preferably has a length which is greater than the distance of the sensor 50 from an axial boundary of the interior space 24 of the drum, in particular the closure plate 40. It is particularly preferred if the adjustment element 60 projects through the closure plate 40 and projects at least 5-15 mm out of the latter. This ensures reliable activation and, if appropriate, also visual monitoring from the outside of the brake device 10 which is bounded by the brake drum 20 and/or the closure plate 40. The adjustment element 60 can also be referred to as a stiff or rigid cable sleeve or additional sleeve or as a dimensionally stable or additional cable reinforcement. A fault (ABV fault) which is caused by a displacement of the sensor 50 can be eliminated with the additional sleeve or cable reinforcement without disassembling built-on parts.

LIST OF REFERENCE NUMBERS

[0028] 10 Brake device

[0029] 12 Axle element

[0030] 14 Longitudinal axis

[0031] 20 Brake drum

[0032] 21 Drum ring

[0033] 22 Bearing device

[0034] 24 Interior space of the drum

[0035] 26 Wheel hub

[0036] 28 Attachment bolt

[0037] 30 Brake carrier

[0038] 32 Brake lining carrier

[0039] 34 Brake lining

[0040] 36 Activation device

[0041] 40 Closure plate

[0042] 42 Opening

[0043] 50 Sensor

[0044] 52 Sensor housing

[0045] 54 Sensor mount

[0046] 56 Sensor longitudinal axis

[0047] 58 Pole wheel

[0048] 60 Adjustment element

[0049] 62 Cable element