DE102017207239A1 - Sensor arrangement for detecting the rotational speed of a transmission input shaft - Google Patents

Abstract

The invention relates to a sensor arrangement (1) for detecting the rotational speed of a transmission input shaft (4) of a motor vehicle transmission, comprising at least one transmitter (2) and at least one sensor (3), wherein the transmitter (2) rotatably connected to the transmission input shaft (4) is, and wherein the sensor (3) fixed within the transmission housing (5a) is provided and / or on the transmission housing (5a) is arranged.
The time required is reduced in terms of assembly or disassembly of the sensor assembly and / or the design effort for the sensor assembly and the associated costs are reduced by the fact that the encoder (2) arranged on the front side of the transmission input shaft (4) and / or is attached.

Description

The invention relates to a sensor arrangement for detecting the rotational speed of a transmission input shaft of a motor vehicle transmission, with at least one encoder and at least one sensor, wherein the encoder is rotatably connected to the transmission input shaft, and wherein the sensor is provided stationary within the transmission housing and / or arranged on the transmission housing is.

In the prior art, different sensor arrangement for detecting the rotational speed of a transmission input shaft of a motor vehicle transmission are already known. In general, all sensor arrangements have in common that they have at least one encoder and one sensor. The encoders are designed differently, these are usually non-rotatably connected to the respective component, in particular the transmission input shaft. The sensor, however, is usually stationary and mounted in the vicinity of the transmitter spaced. The design of the sensor arrangement or the arrangement of the transmitter and the sensor thus influences the manner of the measured value detection and the required installation space and the procedure during assembly or disassembly of the sensor arrangement. In the prior art, different sensor arrangements for detecting the rotational speed of a transmission input shaft of a motor vehicle transmission are now known.

In the DE 103 49 844 A1 from which this invention proceeds, a sensor arrangement for detecting the rotational speed of a transmission output shaft of a multi-stage gearbox is disclosed, wherein a stationary rod-shaped sensor is arranged on the gear housing and a sensor designed as a donor disc is arranged circumferentially on the transmission output shaft. A speed detection or a measured value detection of the transmission output shaft is realized in the radial direction.

In the DE 10 2006 018 818 A1 a sensor arrangement for detecting the rotational speed of a drive motor or the rotational speed of the transmission input shaft of an electrically driven vehicle is described in which a stationary sensor disposed in the transmission housing and a donor rotatably connected to the motor shaft. Here, the encoder is designed as a sender wheel and circumferentially mounted on the motor shaft.

The DE 20 2005 005 260 U1 discloses a device for measuring rotational movements of a wheel bearing, wherein a stationary sensor is arranged such that it detects the rotational movement of the rotating part of a bearing, wherein an encoder, formed as a sleeve is circumferentially mounted on the rotating part of the bearing.

The known in the prior art sensor arrangement for detecting the rotational speed of a transmission input shaft of a motor vehicle transmission from which the invention proceeds, and also the other known sensor arrangements are not yet optimally formed. On the one hand, an additional space around the rotating shaft is claimed due to the arranged around the circumference of the transmission input shaft or the rotating shaft encoder (or from the encoder disc), which in the end requires a large amount of space and on the other hand also increases the total length of the shaft (and thus also the rotating mass), in particular to allow a corresponding circumferential arrangement of the encoder on the shaft. Furthermore, the known sensor arrangements are structurally very complicated, which in particular increases the maintenance or repair scope. Especially with regard to the assembly or disassembly of the sensor arrangement, which is then only possible with a disassembly of the rotating shaft itself and other components, in particular the bearing, the known sensor arrangements are not yet optimally formed. This inevitably leads to an increased expenditure of time and consequently to increased costs. As a result, the sensor arrangements known in the prior art are therefore not yet optimally designed.

The invention is therefore based on the object, the above-mentioned sensor assembly now such design and further that in particular the time required in terms of assembly or disassembly of the sensor assembly and in particular the design effort for the sensor assembly are reduced, the associated costs also are minimized.

The aforementioned object is now achieved in that the transmitter is arranged on the front side of the transmission input shaft and / or fixed.

The basic principle of the invention initially goes to the fact that initially space can be saved because the encoder is arranged on the front side of the transmission input shaft and / or fixed, in principle not - as previously in the prior art - is arranged externally on the outside of the transmission input shaft. As a result, not only the radial space requirement is reduced, but also the total length of the transmission input shaft can be reduced accordingly. Furthermore, in particular by the frontal arrangement and / or attachment of the encoder to the transmission input shaft, a possibly existing frontal cavity in the transmission input shaft (in a hollow shaft) can be used. In particular, this is made possible by the fact that the encoder has multiple sections and / or is designed in several parts, the encoder in particular as a Transmitter wheel or is designed as a donor disc and has a shaft.

The shaft of the transmitter is now arranged in particular coaxially to the axis of rotation of the transmission input shaft, wherein the shaft is at least partially positioned in a frontal cavity of the transmission input shaft or preferably engages the shaft in the formed as a hollow shaft transmission input shaft at least partially into the frontal cavity. Thus, already existing space is used for mounting the encoder and avoided further expansion of the space of the transmission input shaft.

Thus, the encoder in the cavity of the transmission input shaft is not radially rotated or axially displaced, the shaft of the encoder is in particular non-positively and / or positively releasably fastened within the cavity. Preferably, this is achieved in that the shaft of the encoder, at least partially designed conical, and the conical shaft with a so-called expansion element in the cavity is positively and / or positively releasably secured within the frontal cavity of the transmission input shaft or is. The expansion element is in particular designed such that the at least partially conical shaft of the encoder is circumferentially covered by the inner surface of the expansion element or the inner surface of the expansion element rests against the outer surface of the shaft when the expansion element is pushed over the shaft of the encoder.

With the aid of a screw connection, the expansion element is also operatively operatively connected to the shaft, and in particular coaxially, in particular concentrically to the axis of rotation of the transmission input shaft or relative to the shaft of the encoder axially displaceable. By tightening the screw connection, the expansion element is pulled over the preferably conical shaft of the transmitter, whereby the expansion element is spread or at least partially expanded radially, in which case at least partially the outer surface of the expansion element against the inner wall or inner surface of the cavity of the transmission input shaft is pressed and Thus, a frictional connection between the transmission input shaft, the spreader and the shaft is made. For better effectiveness, the outer surface of the expansion element may at least partially have a coating or structuring or even elongated openings. As a result, can be realized in a very elegant way a fuse of the encoder against rotation or slippage and there are no inadmissible forces transmitted to the bearing of the transmission input shaft as may occur, for example, in a circumferential pressing a donor gear on the transmission input shaft.

Alternatively, however, an end-side fitting is conceivable if the transmission input shaft is designed as a solid shaft and in particular a cavity for the shaft of the encoder and for the expansion element would have to be introduced later.

In a further embodiment, the encoder has as the only component only the encoder wheel or the encoder disk, wherein at least one subsequent threaded bore is to be mounted in the then executed as a solid shaft transmission input shaft. Also conceivable is an end-side bonding of the encoder wheel and the encoder disk on the transmission input shaft, whereby the requirement of the subsequently introduced threaded hole is eliminated.

Also conceivable is a positive locking which is designed as a feather key connection between the shaft of the encoder and the particular designed as a hollow shaft transmission input shaft. Alternatively, the shaft of the encoder can be pinned in the trained as a hollow shaft gear input shaft and the encoder wheel or the encoder disc are then bolted to the shaft.

In order to simplify the assembly or disassembly of the sensor assembly in addition, it is provided that the sensor is arranged in or on a gear housing cover, wherein the gear housing cover is formed as a part of the transmission housing. Thus, the sensor from the outside or is easily accessible from outside the gear housing.

By completely removing the gear housing cover and the encoder is very easy to reach during maintenance operations, since a complete opening of the gear housing does not have to be done.

It is also advantageous that the sensor head of the sensor is aligned substantially to the end face of the transmission input shaft, in particular so that the measured value detection is axially feasible. It is particularly advantageous if the gear housing cover is positioned parallel to the end face of the transmission input shaft. Thus, the sensor integrated in the gear housing cover and thus the position or the distance of the sensor head to the encoder wheel can already be ensured during assembly in the gear housing cover.

Finally, the sensor arrangement is also advantageously arranged and / or executed such that it can be carried out for assembly and / or disassembly without dismantling the transmission input shaft.

At the same time this reduces the design complexity of the sensor assembly and simplifies the assembly and disassembly so that the associated costs are also reduced.

As a result, the disadvantages described above are avoided and corresponding advantages are achieved.

• 1 die Sensoranordnung im montierten Zustand in einem Getriebe eines Kraftfahrzeuges in der bevorzugten Ausführungsform in einer schematischen, teils geschnittenen Darstellung,
• 2 die Sensoranordnung aus 1 in der bevorzugten Ausführungsform in einer anderen perspektivischen Teil-Darstellung, und
• 3 die Sensoranordnung aus den 1 und 2 in der bevorzugten Ausführungsform in einer perspektivischen Teil-Darstellung, jedoch ohne weitere Getriebekomponenten.

There are now a variety of ways to design and further develop the sensor arrangement according to the invention in an advantageous manner. For this purpose, reference may first be made to the claims subordinate to claim 1. In the following, a preferred embodiment of the invention with reference to the drawings and the associated description may be explained in more detail. In the drawing shows:

• 1 the sensor arrangement in the assembled state in a transmission of a motor vehicle in the preferred embodiment in a schematic, partially sectioned representation,
• 2 the sensor arrangement 1 in the preferred embodiment in another perspective part representation, and
• 3 the sensor arrangement of the 1 and 2 in the preferred embodiment in a perspective part representation, but without further transmission components.

The 1 to 3 at least partially show a sensor arrangement 1 for detecting the rotational speed of a transmission input shaft 4 a motor vehicle transmission. The sensor arrangement 1 has at least one donor 2 and at least one sensor 3 , In particular for detecting the rotational speed of a motor vehicle drive, in particular the transmission input shaft 4 on.

The gear 5 or the motor vehicle are not shown here in detail or not completely. Shown is but at least partially a transmission housing 5a with a rotationally movable transmission input shaft arranged therein or mounted 4 ,

Shown in the 1 to 3 are the essential components, but these in several different representations, in particular for the preferred embodiment of the invention.

The disadvantages described above are now initially avoided by the fact that the encoder 2 frontally on the transmission input shaft 4 arranged and / or fixed. As a result, initially space is saved, as already described, wherein the total length of the transmission input shaft is also reduced. In detail, the following embodiment may now be made for the preferred embodiment of the invention:

The 1 schematically shows the sensor arrangement 1 when mounted on the gearbox 5a or partially in a gear housing cover 5b and / or partially on the transmission input shaft 4 arranged or integrated. Furthermore, it is off 1 at least partially apparent that within the transmission case 5a a here in particular horizontally aligned or mounted shaft, in particular the transmission input shaft 4 extends. The transmission input shaft 4 is well recognizable here in particular designed as a hollow shaft, wherein within the cavity 4a the transmission input shaft 4 a shaft 2a the giver 2 , a spreading element 6 as well as a central screw 7 is positioned. At the front of the transmission input shaft 4 is the giver 2 , here especially the donor wheel 2 B (or as encoder disk) executed encoder 2 arranged rotationally fixed.

With a central screw 7 becomes the expansion element 6 over the here cone-shaped shaft 2a the giver 2 functionally effective. This is a through hole in the shaft 2a the giver 2 and a receptacle for a nut in the expansion element 6 intended. This is done by tightening the central screw 7 the spreader 6 over the shaft 2a the giver 2 pulled and forcibly radially expanded, so that at least partially the outer surface of the expansion element against the inner wall or against the inner surface of the cavity 4a the transmission input shaft 4 is pressed and thus a frictional connection between the spreader 6 and the inner wall of the transmission input shaft 4 on the one hand and on the other hand also to the shaft 2a the giver 2 is produced. Thus, the giver 2 inside the cavity 4a positioned against rotation.

Furthermore, the shows 1 at least partially the gearbox 5a with the front of the transmission input shaft 4 opposite gear housing cover 5b , The gearbox housing cover 5b is preferably releasable with the transmission 5 connected in particular screwed. In the gearbox housing cover 5b is the sensor 3 stationary integrated and connected via corresponding electrical connections with a control unit (not shown). The sensor head 3a is through a breakthrough in the gearbox housing cover 5b to the dealer, in particular to the donor wheel 2 B up to an air gap of a few millimeters orthogonally introduced, whereby an axial data acquisition is enabled. The stationary sensor 3 , especially the sensor head 3a contains here preferably a Hall IC (not visible). Alternatively, an inductive measured value detection by the sensor head 3a respectively.

It is also obvious that by disassembling the gear housing cover 5b the giver 2 for maintenance or exchange of the encoder 2 (or the encoder wheel 2 B ) is easily accessible. It also becomes clear that this is without further disassembly, especially the transmission input shaft 4 is possible.

In 2 is now the sensor array 1 in the preferred embodiment shown in a perspective view. In this view is the sender wheel 2 B (or the encoder disc) and the sensor 3 and its orthogonal alignment with the encoder 2 clearly visible. The donor wheel 2 B is here frontally on the transmission input shaft 4 fitted and with the central screw 7 with the shaft 2a (not visible) of the encoder 2 or with the expansion element 6 (not visible) functionally effective connected.

In a further embodiment, the encoder 2 formed in several parts, so that after loosening the central screw 7 the donor wheel 2 B (or the encoder disc) as respective individual components of the encoder 2 dismantled or can be mounted. This is particularly advantageous when the encoder wheel is provided as a carrier for one or more magnets (not shown). As a magnet is understood here in particular any magnetizable material. Thus, for example, the encoder wheel may be formed as a plastic injection-molded part, wherein individual magnets have been encapsulated in the manufacture of the encoder wheel or subsequently attached to the encoder wheel, in particular were glued.

Due to the multi-part design, a magnetizable material can be used for the encoder wheel or the encoder disk or the encoder wheel or the encoder disk is made of a non-magnetizable material and is provided as a carrier for a magnetizable material or more magnets. For both alternatives, it is provided that the encoder disk or the encoder wheel is designed as incremental rotary encoder, rotary encoder or general rotary encoder.

The shaft of the encoder can thus be made of a different material, in particular of a non-magnetizable material, as the encoder wheel, for example a plastic, preferably polyamide, or even a light metal. The skillful selection of materials can reduce both the rotating mass and the cost of the encoder.

In 3 is now the sensor array 1 in perspective, without the other transmission components shown. As already explained above, the orthogonal orientation of the sensor head is also in this illustration 3a opposite the encoder or the encoder wheel 2 B clearly visible. Furthermore, here also the coaxial, in particular concentric positioning of the expansion element 6 opposite the shaft 2a the giver 2 clear. In particular, it is very easy to see that the expansion element 6 differently shaped, extending substantially over its length recesses 6a having. This essentially means that a desired deformation point is created, on the basis of which the expansion element 6 in the cavity 4a the transmission input shaft 4 (please refer 1 ) in an easy manner with spreading on the at least partially conical shaft 2a the giver 2 can slide along. The force required for this purpose, as previously described, by tightening the central screw 7 applied.

LIST OF REFERENCE NUMBERS

1

sensor arrangement

2

giver

2a

Shank of the encoder

2 B

Encoder wheel (or the encoder disk)

3

sensor

3a

sensor head

4

Transmission input shaft

4a

Cavity of the transmission input shaft

5

transmission

5a

gearbox

5b

Gear housing cover

6

spreader

6a

recesses

7

central screw

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 10349844 A1 [0003]
• DE 102006018818 A1 [0004]
• DE 202005005260 U1 [0005]

Claims (10)

Sensor arrangement (1) for detecting the rotational speed of a transmission input shaft (4) of a motor vehicle transmission, with at least one encoder (2) and at least one sensor (3), wherein the encoder (2) rotatably connected to the transmission input shaft (4), and wherein the sensor (3) is provided stationary within the transmission housing (5a) and / or arranged on the transmission housing (5a), characterized in that the transmitter (2) is arranged and / or attached to the end face of the transmission input shaft (4). Sensor arrangement after Claim 1 , characterized in that the encoder (2) is designed as a transmitter wheel (2b) or as a donor disk and has a shaft (2a). Sensor arrangement after Claim 2 , characterized in that the shaft (2a) of the transmitter (2) is arranged coaxially and / or concentrically to the axis of rotation of the transmission input shaft (4), wherein the shaft (2a) of the transmitter (2) at least partially in a frontal cavity (4a) the transmission input shaft (4) is positioned, in particular the shaft (2a) of the encoder (2) engages at least partially in the formed as a hollow shaft transmission input shaft (4). Sensor arrangement according to one of the preceding Claims 2 to 3 , characterized in that the shaft (2a) of the transmitter (2) can be fastened non-positively and / or positively releasably within the cavity (4). Sensor arrangement according to one of the preceding Claims 2 to 4 , characterized in that the shaft (2a) of the encoder (2) is at least partially conical. Sensor arrangement according to one of the preceding Claims 2 to 5 , characterized in that an expansion element (6) is provided, wherein the expansion element (6) in the cavity (4a) is positionable and the shaft (2a) of the encoder (2) by means of the expansion element (6) non-positively and / or positively within the cavity (4a) of the transmission input shaft (4) is releasably fastened. Sensor arrangement according to one of the preceding Claims 2 to 6 , characterized in that the shank (2a) of the transmitter (2) and the expansion element (6) by means of a screw connection functionally effective interconnected, in particular axially to the axis of rotation of the transmission input shaft (4) are displaceable relative to each other. Sensor arrangement according to one of the preceding Claims 1 to 7 , characterized in that the sensor (3) is arranged in or on a transmission housing cover (5b), wherein the transmission housing cover (5b) is formed as a part of the transmission housing (5a). Sensor arrangement according to one of the preceding Claims 1 to 8th , characterized in that the sensor (3) has a sensor head (3a) and the sensor head (3a) is substantially aligned with the end face of the transmission input shaft (4), in particular so that the measured value detection is axially feasible. Sensor arrangement according to one of the preceding Claims 1 to 9 , characterized in that the sensor arrangement (1) is arranged and / or designed such that it can be carried out for assembly and / or disassembly without disassembly of the transmission input shaft (4).

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