DE102011084260A1 - Device for mounting signal transducer i.e. active pulse transducer of rotation speed sensor on axle of vehicle, has support element forming pin insertable into slot, so that element and transducer are rotationally connected with axle - Google Patents

Abstract

The device (6) has a support element (34) i.e. disk, for supporting an active pulse transducer (2) and forming a pin (42) that is inserted into a slot on an axle (10), so that the support element and the transducer are rotationally connected with the axle. The pin is axially projected from a nose wheel. A clamping element (46) is provided for radial tensioning of the support element against the wheel. The support element has a recess for receiving the axle and individual items formed circumferentially around the recess. An independent claim is also included for a vehicle.

Description

Field of the invention

The invention relates to a device for fastening a signal receiver of a speed sensor to an axle of a vehicle.

Background of the invention

In vehicles, speed sensors measure the speed of a wheel relative to the chassis. For this purpose, the speed sensor must be mounted at a location in the vehicle, where it can detect the movement of the wheel relative to the chassis. The detected by a speed sensor speed is usually used by the anti-lock brake system for detecting a wheel locked by the brake or an advanced vehicle dynamics control, for example with traction control to detect the yaw rate. The extended vehicle dynamics control system then counteracts understeer or oversteer of the vehicle in good time through dedicated brake interventions.

From the DE 697 09 500 T2 It is known to integrate the speed sensor in the wheel bearing. For this purpose, the speed sensor has an encoder fixed to the inner ring, also called pole wheel, and a signal sensor positioned on the outer ring, which is held on the outer ring via a cover.

However, it has been shown that the data cable for forwarding the measurement results of the signal pickup to a vehicle electronics in the DE 697 09 500 T2 tear easily.

Object of the invention

It is an object of the invention to improve the attachment of a speed sensor in a vehicle.

Solution of the task

The object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.

The invention proposes a device with which the speed sensor can be fixed in a rotationally fixed manner to the axle of a vehicle via a pin connection.

The invention is based on the finding that it occurs in a real pivot bearing, such as a rolling bearing, that the rotating bearing partner entrains the actually stationary bearing partner. In the case of the wheel bearing of a vehicle in which a bearing partner is connected to the axle of the vehicle and the other bearing partner to the wheel of the vehicle, the bearing partner connected to the wheel can entrain the bearing partner associated with the axle, for example due to non-optimal lubrication conditions, and with respect to the axle twist.

However, if the signal sensor is held by the bearing partner connected to the axle, the signal sensor also rotates relative to the axle and winds its connection cable to the vehicle electronics around the axle. If, due to the limited length of the cable, the signal receiver can not continue to rotate with the bearing partner connected to the axle, the tensile forces acting on the cable can become so great that it eventually breaks.

Therefore, the invention proposes a device for mounting a signal receiver of a speed sensor on an axle of a vehicle, comprising a holding element for supporting the signal receiver and a pin formed on the holding element for insertion into a slot on the axle. In this way, the holding element and thus the signal sensor are rotatably connected to the axis.

The pin connection must be designed so that the pin abuts against a wall of the slot when the device is rotated relative to the axis. In this way, the device is rotationally secured against the axis. For this purpose, the tapping connection can be designed in particular in a form-fitting and / or force-locking manner. However, in principle, any shape for the pin is conceivable, which makes it possible to insert the pin in the slot.

The specified device reduces the likelihood of premature failure of the speed sensor, as can be effectively avoided by the rotationally fixed connection winding the connection cable to the vehicle electronics about the axis. A device having the vehicle is thus more reliable and fail-safe. Furthermore, manufacturing costs can be saved, since the connection cables are hardly exposed to the specified device mechanical tensile loads against which they would be manufacturing technology to protect, for example, by an increased cost of materials.

In a further development of the invention, the holding element is a disc and the pin is an axially protruding from the disc nose, which is inserted into the slot on the axis. Under a nose is understood to be an axially projecting from the disc element. This nose can be made in a particularly advantageous manner from the disc. These can be the contours of the nose except for one Bending edge are cut out of the disc by cutting, punching or other methods. The nose is finally bent around the bending edge. The bending radius can preferably be 90 °.

In an alternative or additional development, the device comprises a viewed from a rotational axis of the axis axially angled clamping element for axially engaging behind a clamping seat on a wheel bearing holding the axle. Due to the rear grip of the clamping seat on the wheel bearing, the clamping element can fix the device axially. This is particularly favorable for the assembly of the wheel bearing with the device on the axis, since the device on the wheel bearing in a suitable position for the speed sensor exactly prepositioned and can be mounted together with the wheel bearing on the axle. In addition, the device can be solved together with the wheel bearing from the axis and remove, for example, for maintenance purposes of this.

In a preferred development, the clamping element is provided for radial bracing of the holding element against the wheel bearing. Radial bracing in this context means that the clamping element is held by means of clamping forces which are applied against a center of the wheel bearing. These clamping forces can be applied for example by additional terminals or other components.

In a particularly preferred embodiment, the holding element has a recess for receiving the axis and the clamping element circumferentially around the recess, in particular at equal intervals, formed on individual elements. In this way, the clamping forces circumferentially around the wheel bearing, wherein a sum force of the individual clamping forces against the center of the wheel bearing is zero. In this way, the holding element without additional holding means is held concentrically on the wheel bearing and thus placed in the state on the axis and on the axis. The entire specified device can thus be integrally formed, for example, from a disk.

In a preferred development of the invention, the signal receiver is an active signal receiver. An active signal receiver is to be understood below to mean a signal sensor which converts the rotational speed into an electrical variable, such as voltage or current, while consuming energy. Active transducers are particularly beneficial in a vehicle because they provide readings even at low speeds (such as when starting up) because they are more accurate and because they offer additional features such as automatic relative position control between the transducer and the encoder.

The invention also provides a vehicle comprising an axle, a wheel bearing supporting the axle, and a specified device rotationally connected to the axle via the connector.

In one development of the invention, the wheel bearing comprises an insertion bevel at one axial end, which is engaged behind axially by the clamping element. In this way, the device is axially fixed to the wheel bearing and can be assembled or disassembled in the manner described above together with the wheel bearing.

In a preferred embodiment of the invention, the insertion bevel in the circumferential direction is flat, so that the clamping element is rotatably mounted in the axial rear handle. Eben means in this context that the axial cross sections follow through the chamfers of an ideal circular shape. In this way, the axially fixed to the wheel bearing clamping member can rotate about the insertion, so that no shear forces between the specified device and the relation to the axis actually stationary ring of the wheel bearing are constructed, if this ring still rotates relative to the axis.

In a particularly preferred embodiment of the invention, the device overhangs an axial end side of the wheel bearing radially. In this way, the signal receiver can be mounted axially spaced apart from the axial end side. In this position of the signal pickup, the reading distance between the signal pickup and the encoder is least affected by an axial displacement between the wheel bearing and the specified device, so that the probability of the occurrence of so-called ABS errors is reduced.

Short description of the drawing

Embodiments of the invention are explained below with reference to a drawing. Showing:

1 a first indicated a signal sensor on a wheel bearing specified device in a sectional view according to a first embodiment;

2 the specified device 1 in a front view;

3 a second a signal pickup attached to a wheel bearing specified device in a sectional view according to a second embodiment; and

4 : the specified device off 3 in a front view.

Detailed description of the drawing

It will open 1 Reference is made to a first a signal receiver 2 at a wheel bearing 4 fixing specified device 6 in a sectional view according to a first embodiment shows.

The wheel bearing 4 stores in a vehicle, not shown, a wheel hub 8th rotatable about an axis 10 , While at the wheel hub 8th about threaded holes 11 of which in 1 only one is shown, a not further shown wheel of a vehicle can be attached, is the axis 10 connected to a chassis of the vehicle, not shown.

The wheel bearing 4 has two in the wheel hub 8th recorded outer rings 12 and two inner rings 14 on where the axis is 10 is held. While the outer rings 12 in the wheel hub 8th are inserted, the inner rings 14 in the outer rings 12 inserted and via a clamping element 16 connected with each other. In a radial gap 20 between the outer rings 12 and the inner rings 14 are tapered rollers 18 arranged over which the outer rings 12 opposite the inner rings 14 can roll off. The tapered rollers 18 be in the radial gap 20 in rolling bearing cages 22 held. The radial gap 20 is also at its axial ends via seals 24 closed so that in the radial gap 20 a lubricant not shown in detail can be maintained, the friction between the tapered rollers 18 and the outer rings 12 or between the tapered rollers 18 and the inner rings 14 reduced. In the present embodiment, the wheel hub 8th looking into the picture plane on the left side a long front side 23 with the threaded hole 11 and on the right side one of the long front side 23 opposite short end 25 on. The short front 25 the wheel hub 8th closes flush with a frontal face 21 the inner rings 14 from.

The signal receiver 2 is part of a speed sensor 26 which further includes an encoder 28 , also called pole wheel, owns.

The encoder 28 has an annular perforated disc 27 with holes 30 on, with the perforated disc 27 concentric on the short end 25 the wheel hub 8th put on and in an axial gap 29 between the short end 25 the wheel hub 8th and the signal receiver 2 is arranged. The perforated disc 27 is over bent clamping elements 31 at the short end 25 the wheel hub 8th held. The holes 30 of the encoder 28 are in a manner not shown in the same radial distance from the center of the encoder, not shown 28 and arranged at a uniform circumferential distance from each other. Furthermore, there is the perforated disc 27 of the encoder 28 in the present embodiment of a ferromagnetic material, which is suitable, the magnetic properties of the space in the axial gap 29 to change.

The holes 30 the perforated disc 27 are radially at the height of the signal pickup 2 educated. Rotates the encoder 28 together with the wheel hub 8th so pull the holes 30 the perforated disc 27 in the radial gap 29 in regular and by the speed of the wheel hub 8th dependent time intervals before the signal sensor 2 past. This causes the magnetic properties of the space in the axial gap 29 in front of the signal sensor 2 depending on the speed of the wheel hub 8th change in a pulse shape. These pulses are from the signal sensor 2 recorded and as measurement results via a data cable 32 forwarded to the vehicle electronics for evaluation of the speed.

The signal receiver 2 is an active transducer that converts the acquired pulses into an electrical quantity, such as voltage or current, and through the data cable 32 sends to the vehicle electronics. From the point of view of the vehicle electronics, an active signal pickup therefore represents a voltage source. Active signal pickups are also capable of the position of the signal pickup 2 to capture on the axis. If the position deviates from a predetermined position, the vehicle electronics generate a so-called ABS error. This must then be eliminated as part of an inspection, for example, to ensure that the data cable 32 not around the axis 10 wraps and eventually rips.

To prevent the generation of an ABS error from the outset according to the invention a rotational movement of the signal pickup 2 around the axis 10 avoided. This is the signal sensor 2 on the specified device 6 held, the specified device 6 against twisting against the axle 10 is secured.

For this purpose, the specified device 6 a holding element 34 on that in 2 is shown in a front view. The holding element 34 is made in the present embodiment of an annular plate and has a ring portion 38 on, from the at a circumferential position radially a support area 40 protrudes. The ring area 38 and the carrying area 40 are shifted axially to each other. From the ring area 38 radially below the support area 40 is a cone 42 bent out, like a nose from the ring area 38 protrudes axially. It also penetrates the carrying area 40 a window 44 ,

The holding element 34 lies axially on the above-mentioned end face 21 the inner rings 14 on and is axially between the inner rings 14 and the axis 10 trapped. This grip clamping elements in the form of claws 46 that are radially below the ring area 38 are formed axially behind a clamping seat in the form of a bead 48 at the front 21 the inner rings 14 , The bead 48 therefore acts as an insertion bevel, which the device 6 over the claws 46 to the front side 21 the inner rings 14 attracts and the device 6 so axially on the front side 21 the inner rings 14 and thus at the wheel bearing 4 fixed. Because the front side 21 of the inner ring 14 flush with the short end 25 the wheel hub 8th concludes, lie the ring area 38 of the holding element 34 and the perforated disc 27 axially on a line. Because of the carrying area 40 axially to the ring area 38 is shifted, it overlaps the perforated disc 27 , In this way, the signal receiver 2 through the window 44 through the encoder 28 influenced magnetic properties of the space in the axial gap 29 and thus detect the pulses in the manner explained above.

The pin 42 takes over the actual rotation of the device 6 opposite the axis 10 , It is positively in a corresponding not further referenced slot in the axis 10 inserted. However, the form fit itself is not absolutely necessary. It is sufficient if slot the pin 42 after a certain rotation of the device 6 opposite the axis 10 provides a stop in the tangential direction, so that further rotation of the device 6 opposite the axis 10 is avoided. The pin 42 For example, you can use a machining technique such as sawing or milling, or a cutting technique such as punching from the support area 40 of the holding element 34 be cut out. This is the pin 42 except for a bending edge 43 from the holding element 34 worked out and then around the bending edge 43 axially from the retaining element 34 bent.

The claws 46 hold the device 6 as already mentioned about the bead 48 axially on the inner ring 14 , Will the wheel bearing 4 and thus the inner ring 14 for example, for maintenance purposes of the axle 10 removed, so does the device 10 thereby automatically removed. Ideally, the claws reach behind them 46 to the bead 48 axially frictionally engaged in the present embodiment. Alternatively to the axial fixation of the device 6 at the wheel bearing 4 with the claws, the holding device could, for example, also cohesively with the inner ring 14 get connected. An axial force or cohesive connection of the holding element 34 with the inner ring 14 also has the advantage that the specified device 6 on the inner ring 14 preassembled and thus can be placed in a precise position on the axle.

While the cones 42 thus a rotation of the specified device 6 opposite the axis 10 The claws allow it 46 the specified device 6 on the inner ring 14 pre-assembled on the axle 10 sit up and both together from the axle 10 to remove again.

The axis 10 and the inner rings 14 are against each other via an O-ring seal 50 sealed.

It will be on the 3 and 4 Reference is made to the signal receiver 2 at the wheel bearing 4 fixing specified device 6 in a sectional view according to a second embodiment show. In the 3 and 4 become the 1 and 2 the same elements with the same reference numerals and not described again.

In the second embodiment of 3 is the in 1 mentioned front page 21 of the inner ring 14 axially above the short end 25 the wheel hub 8th , In this way, the retaining element 34 the specified device 6 be made of an undeformed annular plate.

From the carrying area 40 is the window 44 along with the pin 42 cut out together in the manner already described, wherein the pin 42 then around the bending edge 43 is bent axially from the plate. The bent pin 42 Finally, to the rotation of the device against the axis 10 in the above-mentioned slot on the axis 10 in the form of a groove 52 introduced.

The claws 46 In the present embodiment, they are not on the radial underside of the ring area 38 but essentially in the radially middle region of the annular region 38 educated. Also, as a clamping seat no bead on the radial underside of the inner rings 14 educated. The claws 46 lie horizontally on the radial top of the inner rings 14 in the radial gap 20 on. That way, the claws can 46 the device 6 axially on the wheel bearing 4 hold with a clamping force, so that this as already mentioned in one piece with the device 6 can be installed in the vehicle. When removing the wheel bearing 4 However, this clamping force is not sufficient from the vehicle, the device 6 at the wheel bearing 4 axially fix so that the device is on the axis 10 remains. In this way, it is not necessary when removing the wheel bearing 4 the signal transducers 2 at the device 6 to solve, since this with the device 6 remains on the vehicle.

LIST OF REFERENCE NUMBERS

2

signal sensor

4

Wheel bearings

6

contraption

8th

wheel hub

10

axis

12

outer ring

14

inner ring

16

clamping element

18

Tapered roller

20

radial gap

21

front

22

Rolling bearing cage

23

front

24

poetry

25

front

26

Speed sensor

27

perforated disc

28

encoder

29

gap

30

hole

31

clamping element

32

data cable

34

retaining element

36

collar

38

ring area

40

support area

42

spigot

43

bending edge

44

window

46

claw

48

bead

50

poetry

52

groove

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 69709500 T2 [0003, 0004]

Claims (10)

Contraption ( 6 ) for attaching a signal receiver ( 2 ) a speed sensor ( 26 ) on an axis ( 10 ) of a vehicle comprising a holding element ( 34 ) for carrying the signal receiver ( 2 ) and one on the holding element ( 34 ) trained pin ( 42 ) for insertion into a slot ( 52 ) on the axis ( 10 ), so that the retaining element ( 34 ) and thus the signal sensor ( 2 ) with the axis ( 10 ) are rotatably connected. Contraption ( 6 ) according to claim 1, wherein the retaining element ( 34 ) a disc and the pin ( 42 ) are an axially projecting from the disc nose, in the slot ( 52 ) on the axis ( 10 ) can be inserted. Contraption ( 6 ) according to claim 1 of 2, comprising one of an axis of rotation of the axis ( 10 ) seen from axially angled clamping element ( 46 ) for axially engaging behind a clamping seat ( 48 ) on one axis ( 10 ) holding wheel bearing ( 4 ). Contraption ( 6 ) according to claim 3, wherein the clamping element ( 46 ) for radial clamping of the holding element ( 34 ) against the wheel bearing ( 4 ) is provided. Contraption ( 6 ) according to claim 3 or 4, wherein the retaining element ( 34 ) a recess for receiving the axis ( 10 ) and the clamping element ( 34 ) comprises circumferentially formed around the recess individual elements. Contraption ( 6 ) according to one of the preceding claims, comprising the pickup ( 2 ), which is an active pickup. Vehicle comprising an axle ( 10 ) with an axially extending slot, an axis ( 10 ) bearing wheel bearing ( 4 ) and a device ( 6 ) according to any one of the preceding claims, wherein the pin ( 42 ) for the rotationally fixed connection of the device ( 6 ) with the axis in the slot ( 52 ) is inserted. Vehicle according to claim 8, wherein the wheel bearing ( 4 ) at an axial end an insertion bevel ( 48 ) formed by the clamping element ( 46 ) is engaged axially behind. Vehicle according to claim 9, wherein the insertion bevel ( 48 ) is planar in the circumferential direction, so that the clamping element ( 46 ) is rotatably mounted in the axial rear handle. Vehicle according to one of the preceding claims, wherein the device ( 6 ) an axial end side ( 25 ) of the wheel bearing ( 4 ) radially overhangs.

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