WO2019210908A1

WO2019210908A1 - Torque sensor arrangement and roll stabilizer having a torque sensor arrangement

Info

Publication number: WO2019210908A1
Application number: PCT/DE2019/100383
Authority: WO
Inventors: Dominik Reif; Manuel SCHMITT; Thomas Lindenmayr; Hendrik TECH
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2018-05-03
Filing date: 2019-04-29
Publication date: 2019-11-07
Also published as: DE102018110553A1

Abstract

The present invention relates to a torque sensor arrangement (01) for determining a torque at a machine element (02) extending in an axis (03), comprising at least one primary sensor which is the form of a magnetically coded section of the machine element (02), and at least one secondary sensor (04) which is arranged opposite the primary sensor and is intended to convert the changes in a magnetic field generated by the primary sensor into an electrical signal, wherein the secondary sensor (04) is arranged on a circuit board (05). The circuit board (05) has a base surface (07) and at least one surface (08) running at an angle to the latter, wherein the surface (08) is arranged opposite the primary sensor, and wherein the secondary sensor (04) is arranged on the surface (08). The torque sensor arrangement (01) also comprises a sleeve-shaped carrier (10) having an end-face flange (13) at one of the ends thereof, wherein the base surface (07) is fastened to the flange (13) and the surface (08) is fastened to the sleeve-shaped carrier (10). The invention also relates to a roll stabilizer having such a torque sensor arrangement.

Description

Drehmomentsensoranordnunq and roll stabilizer with

Drehmomentsensoranordnunq

The present invention relates to a torque sensor arrangement for detecting a torque on a machine element extending in an axis. The torque sensor arrangement is based on the inverse magnetostrictive effect. The invention further relates to a roll stabilizer with integrated

Torque sensor arrangement.

DE 10 2011 078 819 A1 shows a split roll stabilizer of a

Motor vehicle, softer between its two stabilizer parts has an actuator for a torsion of the stabilizer parts. At each stabilizer part a magnetically encoded primary sensor is arranged. The primary sensor is preferably as

formed magnetically coded portion of the stabilizer part. One as

Magnetic field sensor executed secondary sensor converts the changes of the magnetic field of the primary sensor into an electrical signal.

WO 2016/127988 A1 shows an arrangement for measuring a force or a moment on a machine element extending in an axis. The force or the moment acts on the machine element, which leads to mechanical stresses and the machine element deforms slightly. The machine element has at least two magnetization areas extending circumferentially about the axis for a magnetization formed in the machine element. The magnetization regions each form a primary sensor for determining the force or the moment. The arrangement further comprises at least a first magnetic field sensor, a second magnetic field sensor and a third magnetic field sensor, each of which has a secondary sensor for

Form determination of force or moment. The primary sensors, d. H. the magnetization regions are used to convert the force to be measured or the moment to be measured into a corresponding magnetic field, while the

Secondary sensors allow the conversion of this magnetic field into electrical signals. The magnetic field sensors are each for individual measurement of a direction component of a by the magnetization and by the force or the Moment caused magnetic field formed. The magnetic field occurs due to the inverse magnetostrictive effect. The magnetic field sensors are arranged opposite the machine element, wherein preferably only a small radial distance between the magnetic field sensors and an inner or outer surface of the machine element is present. The magnetic field sensors can be arranged in pairs at the same position, for example on a front and a back side of a circuit board.

Currently, standard magnetic boards are commonly used for magnetic field sensors. Since the magnetostrictive measuring principle works only up to a certain distance between primary and secondary sensor and provides reliable measured values, the magnetic field sensors should be placed as close as possible to the magnetization areas of the component. The magnetic field sensors are therefore placed as far outside as possible on the edge of the board to get as close to the primary sensor. However, placing components close to the edges is not always possible because given board design rules set a minimum distance between them

Prescribe board edge and the components to be placed on the board.

As a result, the distance between primary and secondary sensors can be large, so that this sensor principle only works poorly or not at all. Restrictions also exist due to certain installation space specifications.

The object of the present invention, starting from the prior art, is to provide a torque sensor arrangement with a secondary sensor placed on a printed circuit board, in which there is always an optimal distance between the secondary sensor and a primary sensor. Furthermore, a roll stabilizer with an integrated torque sensor arrangement is to be provided.

To achieve the object according to the invention is a torque sensor arrangement according to the appended claim 1 and a roll stabilizer according to the appended claim. 9 The torque sensor arrangement according to the invention is used to measure a torque on a machine element extending in an axis. The axis preferably forms an axis of rotation of the machine element. The

Torque sensor assembly comprises at least one primary sensor, which is designed as a magnetically coded portion of the machine element. The machine element is preferably a flange of a

Roll stabilizer on a motor vehicle, so that the primary sensor is formed as a magnetically coded portion of the flange. At least one secondary sensor is arranged opposite the primary sensor. The secondary sensor is used to convert the changes in the magnetic field of the primary sensor into an electrical signal. The secondary sensor is located on a circuit board and is preferably designed as an integrated circuit structure. The board has a flat base surface and at least one surface extending at an angle to the base surface. This angularly extending surface is arranged opposite the primary sensor. It is preferably substantially smaller in size than the base area. The secondary sensor is arranged on the angled surface. As advantageous, a perpendicular to the base surface has been found. The torque sensor assembly further includes a sleeve-shaped carrier to which the circuit board is attached.

A significant advantage of the torque sensor arrangement according to the invention is that a very close positioning of the secondary sensor to the machine element and the primary sensor is made possible by arranging the secondary sensor on the surface running at an angle to the base surface of the board. From the inventively realized very small distance between the

Magnetic field of the primary sensor and the secondary sensor result in comparatively strong homogeneous magnetic fields in the region of the secondary sensor. In this way very high measuring accuracies can be achieved. The inventive

Solution is also characterized by a very high robustness against external interference fields. Furthermore, it is advantageous that both axial and radial magnetic fields can be measured with the torque sensor arrangement, since the

Secondary sensors can be arranged in three dimensions. The solution can be realized cost-effectively and with little effort. The arrangement of the board on the carrier is a compact unit available, which can be mounted with little effort on the machine element. The assembly of board and carrier is preferably at least partially within the machine element. In this case, the magnetically coded portion extends on an inner surface of the machine element.

The carrier is preferably made of plastic. However, it should not be limited to plastic carriers. Other suitable materials are possible.

According to a preferred embodiment, the sleeve-shaped carrier has at its one end an end flange. The base of the board is in this case attached to the flange and the surface on the sleeve-shaped carrier.

On the base of the board is preferably an evaluation unit for evaluating the signals of the secondary sensor, which is preferably designed as an integrated circuit structure. The evaluation unit is preferably in

Data exchange with an external data processing unit.

The board is preferably designed as a flexible board or rigid flexible board. In this way, the angled surface can be realized with little effort. The board preferably has at least one flexible area. The angled or angled surface is over the flexible area with the

Floor area connected. Alternatively, the angled surface may also be connected to the base by means of soldered cables, cable-plug connections or plug connections.

According to an advantageous embodiment, the board comprises two angled surfaces, which are arranged opposite to each other. At least one secondary sensor is arranged on both surfaces. According to a preferred

Embodiment, the surfaces are connected via a respective flexible region with the base. The at least one secondary sensor is preferably formed by a forester probe, by a fluxgate magnetometer, by a flat sensor, by a coil, by a flat conductor sensor or by an XMR sensor. In principle, another type of sensor can also be used insofar as it is suitable for measuring the magnetic field produced by the inverse-magnetostrictive effect.

The magnetically coded portion forming the primary sensor preferably extends completely circumferentially about the axis. The magnetically coded portion is preferably permanently magnetized, so that the magnetization by a

Permanent magnetization is formed. In alternative embodiments, the torque sensor assembly further comprises at least one magnet for

Magnetizing the magnetically encoded region, so that the magnetization of the magnetically encoded region is basically temporary. The at least one magnet may be formed by at least one permanent magnet or alternatively by an electromagnet.

The machine element is preferably equipped with two primary sensors. The primary sensors preferably each have a secondary sensor arranged opposite one another.

According to an advantageous embodiment, the machine element as a flange of a roll stabilizer or as a wave, in particular a Flohlwelle

educated.

The electromechanical roll stabilizer according to the invention comprises two

Stabilizer parts, which are each coupled to a suspension of a vehicle. Between the stabilizer parts is an actuator for acting on the

Stabilizer parts arranged with moments. In the roll stabilizer is the

integrated torque sensor arrangement integrated. The primary sensor of

Torque sensor assembly is preferably formed as a magnetically coded portion of a non-rotatably connecting the stabilizer part with the actuator serving flange. Further advantages and details of the invention will become apparent from the following description of preferred embodiments, with reference to the

attached figures. Show it:

Fig. 1 is a sectional view of a preferred embodiment of a

torque sensor arrangement according to the invention;

FIG. 2 is a perspective view of a board attached to a carrier of the torque sensor arrangement according to the invention according to a first embodiment; FIG.

Fig. 3 shows the board of FIG. 2 in its non-angled or kinked

Status;

FIG. 4 shows the circuit board according to FIG. 3 in its bent state; FIG.

5 shows a second embodiment of the circuit board of the torque sensor arrangement in its non-angled or bent state.

FIG. 6 shows the circuit board according to FIG. 5 in its bent state; FIG.

Fig. 7 is a simplified overall view of an electromechanical

Roll stabilizer for a motor vehicle.

1 shows a sectional view of a preferred embodiment of a torque sensor arrangement 01 according to the invention. The torque sensor arrangement 01 serves to determine a torque on a machine element 02, which is preferably designed as a flange of a roll stabilizer (see FIG. 7). The machine element 02 has an axis 03, which also forms the axis of rotation of the machine element 02. The

Torque sensor assembly 01 initially comprises at least two primary sensors (not shown). These are magnetically coded sections of the machine element 02, which are arranged on the inner surface of the machine element 02. The magnetically coded sections extend completely circumferentially about the axis 03 and are axially spaced from each other. The machine element 02 is preferably made of a ferromagnetic material, which can be encoded in a simple manner magnetic sections. The primary sensors convert the forces applied to the machine element 02 forces into a magnetic signal which can be detected on the inner surface of the machine element 02.

The torque sensor arrangement 01 further comprises four secondary sensors 04, which are arranged in the immediate vicinity of the primary sensors, wherein each two of the secondary sensors 04 each one of the primary sensors opposite

are arranged. The secondary sensors 04 convert changes in the magnetic field, which are caused by forces acting on the primary sensors or mechanical stresses, into an electrical signal. The secondary sensors 04 are formed as integrated circuit structures, which are arranged on a circuit board 05. The board 05 has a base surface 07 and two angled to the base 07 extending angled surfaces 08. The angled surfaces 08 are arranged opposite to each other. In the embodiment shown, the base surface 07 is flat. The angled surfaces 08 are perpendicular to the base 07. In alternative embodiments, the base 07 may be uneven. The angled surfaces 08 can extend at any angle to the base surface 07. The angled surfaces 08 are the

Primary sensors arranged opposite. The secondary sensors 04 are located on the angled surfaces 08. By positioning the

Secondary sensors 04 on the angled surfaces 08, a very small distance between the primary sensors and the secondary sensors 04 can be realized. The small distance between the primary and secondary sensors results in comparatively strong homogenous secondary sensors

Magnetic fields, which allow a very high measuring accuracy and are robust against external interference fields.

The board 05 is attached to a sleeve-shaped carrier 10. In the embodiment shown, the fastening takes place by means of mechanical fastening means 12. The sleeve-shaped carrier 10 has an end face at one of its two ends Flange 13 on. The base 07 of the board 05 is fixed to the flange 13, while the angled surfaces 08 extend along the sleeve-shaped support 10 and are fixed to the surface thereof. An electrical connection plug (not shown) for the data exchange or the power supply is preferably arranged on the carrier 10. The carrier 10 is preferably made of plastic.

An evaluation unit 14 is arranged on the base 07 of the board 05. The evaluation unit 14 is preferably designed as an integrated circuit structure.

The board 05 is preferably designed as a flexible board or rigid flexible board.

FIG. 2 shows a perspective view of the board 05 of the torque sensor arrangement fastened to the carrier 10 according to a first embodiment. Figures 3 and 4 show the board 05 according to the first embodiment in detail. The circuit board 05 is shown in its non-angled or not kinked state in Fig. 3. Fig. 4 shows the board 05 in its folded state. The board 05 has in the embodiment shown on a circular, flat base surface 07. On the base 07, the evaluation unit 14 is arranged. The circuit board 05 further comprises the angled surfaces 08, which are rectangular in shape and arranged opposite one another. The surfaces 08 are dimensioned with a smaller width than the base surface 07. The surfaces 08 are connected via a respective flexible region 15 with the base 07. The flexible regions 15 allow an angular alignment of the surfaces 08 to the base surface 07. The surfaces 08 are aligned in their end position perpendicular to the base surface 07.

Figures 5 and 6 show a second embodiment of the board 05, wherein in Fig. 5, the not kinked and in Fig. 6, the bent state of the board 05 is shown. The circuit board 05 in turn comprises the base surface 07 and the angled surfaces 08. However, the base surface 07 here is rectangular. The surfaces 08 are in turn connected via the flexible regions 15 with the base 07. In the folded state of the board 05, the surfaces 08 are aligned perpendicular to the base 07. Fig. 7 shows an electromechanical roll stabilizer 17 with two stabilizer parts 18. Between the mutually facing ends of the stabilizer parts 18 is an actuator 19 for acting on the stabilizer parts 18 with torques

arranged. The stabilizer parts 18 are each connected via a flange 20 to the

Actuator 19 connected. The stabilizer parts 18 are supported by two stabilizer bearings 22 on a vehicle body (not shown). In the roll stabilizer 17, the already described torque sensor assembly 01 is integrated (not

) Shown. The primary sensor of the torque sensor arrangement is preferably designed as a magnetically coded section arranged on the flange 20. Here, only one of the two flanges 20 or both flanges 20 a

having magnetic coded section. Each flange 20 may comprise a plurality of magnetically coded sections for realizing a plurality of primary sensors. The integrated torque sensor arrangement, which may be constructed according to one of the embodiments explained above, allows a permanently accurate and reliable detection of the torques occurring. The of the

Measured values supplied to the torque sensor arrangement are fed to the control unit of the roll stabilizer 17 and utilized in the activation of the actuator 19. This allows the accuracy of the supplied by the roll stabilizer

improve corrective moments, which has an advantageous effect on the driving behavior (roll stability) of the vehicle, especially in borderline situations.

LIST OF REFERENCES

Torque sensor assembly

machine element

axis

secondary sensor

circuit board

Floor space

Angled surface

Carrier mechanical fasteners

flange

evaluation

flexible area

roll stabilizer

stabilizer parts

actuator

flange

stabilizer suspension

Claims

claims

1. torque sensor arrangement (01) for determining a torque

a machine element (02) extending along an axis (03), comprising:

• at least one primary sensor acting as a magnetically encoded one

Section of the machine element (02) is formed;

• at least one opposite to the primary sensor arranged

A secondary sensor (04) for converting the changes of a magnetic field generated by the primary sensor into an electrical signal, wherein the secondary sensor (04) is disposed on a board (05); characterized in that the circuit board (05) has a base surface (07) and at least one surface (08, 09) extending at an angle to this base surface, wherein the angularly extending surface (08, 09) is arranged opposite the primary sensor, and wherein the secondary sensor (04) on the surface (08) is arranged, and that the torque sensor assembly (01) further comprises a sleeve-shaped carrier (10), wherein the circuit board (05) on the sleeve-shaped carrier (10) is attached.

2. torque sensor assembly (01) according to claim 1, characterized in that the sleeve-shaped carrier (10) at one of its ends an end flange (13), wherein the base (07) on the flange (13) is fixed.

3. torque sensor assembly (01) according to claim 1 or 2, characterized

in that the magnetically coded section extends on an inner surface of the machine element (02), and in that the sleeve-shaped carrier (10) is arranged at least in sections within the machine element (02).

4. torque sensor assembly (01) according to one of claims 1 to 3, characterized in that the angularly extending surface (08) perpendicular to the base surface (07).

5. torque sensor assembly (01) according to one of claims 1 to 4, characterized in that on the base (07) an evaluation unit (14) for evaluating the signals of the secondary sensor (04) is arranged.

6. torque sensor assembly (01) according to one of claims 1 to 5, characterized in that the board (05) is designed as a flexible board or rigid flexible board.

7. torque sensor assembly (01) according to claim 6, characterized in that the board (05) has at least one flexible portion (15), wherein the angled surface (08) via the flexible portion (15) with the

Base (07) is connected.

8. torque sensor assembly (01) according to one of claims 1 to 5, characterized in that the angled surface (08) via cables or cable-plug connections or plug connections to the base (07) is connected.

9. Electromechanical roll stabilizer (17) for a vehicle with two

Stabilizer parts (18) which can each be coupled to a wheel suspension of the vehicle and with an actuator (19) arranged between the stabilizer parts (18) for acting on the stabilizer parts (18) with torques, the roll stabilizer (17) having a torque sensor arrangement (01) according to any one of claims 1 to 8, for detecting the torques impressed on the stabilizer parts (18).

10. roll stabilizer (17) according to claim 9, characterized in that the

Primary sensor of the torque sensor assembly (01) as a magnetically coded portion of a for connecting the stabilizer member (18) with the actuator (19) serving flange (20) is formed.