Sensor bearing system

Abstract

The invention relates to a sensor bearing system with a rotatable bearing component (38, 40, 50, 52) rotatably mounted relative to a stationary bearing component (12, 54) by means of two rolling bearings (42a, 42b) arranged at an axial distance from each other, and a sensor arrangement for detecting the rotational position and / or the rotational speed of the rotatable bearing component (38), which comprises a sensor ring (50) arranged on the rotatable bearing component (38, 40, 50, 52) and at least one sensor element (52) arranged on the stationary bearing component (12, 54), wherein a clamping element (46) is arranged on the rotatable bearing component (38, 40, 50, 52), which is designed both to generate an axial preload for the sensor bearing system and as a support element for fastening the sensor ring (50) of the sensor arrangement.

Description

[0001] The invention relates to a sensor bearing system according to the preamble of claim 1.

[0002] Such a sensor bearing system is used, for example, to detect rotation in a rotating system in order to capture the rotational speed and / or position of a rotating component relative to a stationary component.

[0003] Sensor bearing systems are used, for example, in the automotive industry, in automation technology, and especially in robotics, and can be part of a drive device for moving parts of automobiles or automated systems, particularly robots. A sensor bearing system comprises, for example, a bearing or bearing system for the rotary mounting of a rotatable bearing component relative to a stationary bearing component, and a sensor arrangement consisting of a sensor ring, which is attached, for example, to the rotatable bearing component, and a sensor element, which is attached, for example, to the stationary bearing component and detects the current rotational position and / or rotational speed of the sensor ring.

[0004] Such a sensor storage system is disclosed, for example, in DE 10 2022 206 985 A1.

[0005] The sensor arrangement requires additional installation space, which is often not available.

[0006] The object of the invention is to provide a sensor bearing system that requires the smallest possible installation space.

[0007] This problem is solved by a sensor bearing system with the features of claim 1.

[0008] The sensor bearing system comprises a rotatable bearing component which is rotatably mounted relative to a stationary bearing component by means of two rolling bearings arranged at an axial distance from each other, and a sensor arrangement for detecting the rotational position and / or the rotational speed of the rotatable bearing component, which includes a sensor ring arranged on one bearing component and at least one sensor element arranged on the other bearing component.

[0009] According to the invention, a clamping element is arranged on the rotatable bearing component, which serves both to generate an axial preload for the sensor bearing system and as a support element for attaching the sensor ring of the sensor arrangement.

[0010] Because the clamping element simultaneously serves to generate an axial preload of the rolling bearings and as a support element for the sensor ring of the sensor bearing system, the axial height of the sensor bearing system can be kept low in particular, and costs for the manufacture and assembly of additional components can be saved.

[0011] Preferably, the clamping element is designed as a preload nut that can be easily screwed onto a corresponding thread of a shaft of the sensor bearing system.

[0012] The clamping element can be positioned on the shaft of the sensor bearing system in such a way that it rests axially and force-transmittingly against an inner ring of one of the two rolling bearings.

[0013] To achieve a temperature-compensated preload force, an additional ring-shaped spring element can be arranged axially to transmit force between the clamping element and the inner ring of one of the two rolling bearings.

[0014] The sensor ring of the sensor bearing system may have optical, magnetic or other electronically readable markings that are readable by the at least one sensor element which has an optical, magnetic or other electronic sensor.

[0015] In a preferred embodiment of the invention, the sensor ring is designed as a magnetic sensor ring which is magnetized with several magnetic poles distributed around its circumference, with magnetic north poles and south poles alternating.

[0016] The sensor bearing system can preferably be designed as part of a drive device, in particular a belt drive device, wherein the sensor bearing system is designed for rotary bearing and position detection of an output shaft of the belt drive device.

[0017] An embodiment of the invention is described in more detail below with reference to the drawings. Fig. Figure 1 shows a section through a sensor bearing system as part of a belt drive. Fig. Figure 2 shows an enlarged view of section A in Fig. 1.

[0018] The sensor bearing system according to the invention is, for example, part of a system in the Fig. 1 and Fig.The belt drive 10 shown in Figure 2 comprises a housing 12 in which a drive motor 14 is arranged. The drive motor 14 is, for example, a permanent magnet electric machine housed in a motor housing 16. A drive shaft 18 of the drive motor 14 is rotatably mounted in the motor housing 16 by means of bearings 24. The bearings 24 are, for example, designed as rolling bearings and are arranged at an axial distance from each other in a bottom flange and an upper cover 16b of the motor housing 16. Motor electronics 30 are arranged in a cavity between the bottom flange and a lower cover 16a of the motor housing 16.

[0019] The drive motor 14 comprises a rotor 22, which is attached to the outer circumference of the shaft 18 and is magnetized on its outer circumferential surface or provided with permanent magnets that are separated by an air gap from an electric stator 26 surrounding the rotor 22. The electric stator 26 is supplied with current by the motor electronics 30 and thereby generates a magnetic field by which the rotor 22, together with the drive shaft 18, is set into rotation. The cover 16b or the motor housing 16 is attached to or in the housing 12 of the belt drive 10.

[0020] A free end of the drive shaft 18 protrudes from the cover 16b of the motor housing 16 and through an opening in the housing 12 of the belt drive 10 and carries a preferably toothed drive pulley 20.

[0021] The drive pulley 20 rotates a preferably toothed output pulley 40, which is attached to an output shaft 38, via a belt 44, preferably a toothed belt. The output shaft 38 is rotatably mounted in the housing 12 of the belt drive 10 by means of a sensor bearing system with two rolling bearings 42a, 42b. A load to be driven can be connected to the output shaft 38 and rotated by it. The drive pulley 20 and the output pulley 40 can have different diameters so that a desired gear ratio can be achieved. The drive motor 14 with the drive pulley, the output pulley, and the belt are preferably covered and protected by a cover 28. Only the output shaft 38 for attaching the load to be driven protrudes through an opening in the cover 28.

[0022] A sensor bearing system is used for the rotary support of the output shaft 38. This system comprises two rolling bearings 42a and 42b, which are preferably designed as tapered roller bearings in an O-arrangement. The rolling bearings 42a and 42b are preloaded by means of a clamping element 46, which is preferably designed as a clamping nut with an internal thread. The clamping element 46 is arranged on the output shaft 38 and engages in an external thread of the output shaft 38. By rotating the clamping element 46, it can be moved axially on the output shaft 38 such that its end face rests against an end face of an inner bearing ring of the lower rolling bearing 42b and exerts a compressive force on the inner bearing ring in the axial direction. The required preload of the two rolling bearings 42a and 42b can be set by tightening the clamping element 46 with a predetermined tightening torque.

[0023] Additionally, an annular spring element 48, designed, for example, as a wave spring, can be arranged between the clamping element 46 and the inner bearing ring of the lower rolling bearing 42b. In this case, a specific distance between the clamping element 46 and the inner bearing ring of the lower rolling bearing 42b is set by means of the clamping element 46, thereby pre-tensioning the spring element 48 and providing a desired preload force on the inner bearing ring of the lower rolling bearing 42b. By using the spring element 48, the set preload of the sensor bearing system can be maintained over a wide temperature range.

[0024] According to the invention, the clamping element 46 additionally serves as a sensor carrier for a sensor ring 50 of the sensor arrangement, wherein the sensor ring 50 is arranged on an end face of the clamping element 46 and is rigidly connected to it. The clamping element 46 and the sensor ring 50 rotate together with the output shaft 38.

[0025] The sensor ring 50 can preferably be designed as a magnetic ring which is screwed onto a lower end face of the clamping element 46 and which is magnetized with several magnetic poles distributed over its circumference, with magnetic north poles and south poles alternating.

[0026] A cover 54 is attached to the housing 12 of the belt drive 10, sealing the sensor bearing system at the bottom. At least one sensor element 52, designed as a magnetic field sensor, e.g., a Hall sensor, is arranged on the housing 12 or the cover 54. The sensor element 52 is axially opposite and at a small axial distance from the sensor ring 50. The sensor element 52 detects the orientation of the magnetic fields of the sensor ring 50, from which the rotation angle of the output shaft 38 can be calculated. The achievable accuracy of determining the rotation angle of the output shaft 38 depends on the number of magnetic poles of the sensor ring 50 and the number and positioning of the sensor elements 52 used. List of reference symbols 10 Belt drive 12 cases 14 Drive motor 16 Motor housings 16a upper cover 16b lower cover 18 Drive shaft 19 axis of rotation 20 Drive pulley 22 Rotors 24 Bearings 26 Stator 28 Cover 30 Engine electronics 38 Output shaft 39 axis of rotation 40 Output disc 42a Rolling bearings 42b Rolling bearings 44 belts 46 clamping element 48 spring element 50 Sensor ring 52 sensor elements 54 lids QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2022 206 985 A1

[0004]

Claims

Sensor bearing system with a rotatable bearing component (38, 40, 50, 52) rotatably mounted relative to a stationary bearing component (12, 54) by means of two rolling bearings (42a, 42b) arranged at an axial distance from each other, and a sensor arrangement for detecting the rotational position and / or the rotational speed of the rotatable bearing component (38), which comprises a sensor ring (50) arranged on the rotatable bearing component (38, 40, 50, 52) and at least one sensor element (52) arranged on the stationary bearing component (12, 54), characterized in that a clamping element (46) is arranged on the rotatable bearing component (38, 40, 50, 52), which is designed both to generate an axial preload for the sensor bearing system and as a support element for fastening the sensor ring (50) of the sensor arrangement. Sensor bearing system according to claim 1, characterized in that the clamping element (46) is designed as a preload nut that can be screwed onto an output shaft (38) of the rotatable bearing component. Sensor bearing system according to claim 1 or 2, characterized in that the clamping element (46) rests axially and force-transmittingly on an inner ring of one of the two rolling bearings (42a, 42b). Sensor bearing system according to one of claims 1 to 3, characterized in that an annular spring element (48) is arranged axially to transmit force between the clamping element (46) and the inner ring of one of the two rolling bearings (42a, 42b). Sensor bearing system according to one of claims 1 to 4, characterized in that the sensor ring (50) has optical, magnetic, inductive, capacitive or other electronically readable position markings which are readable by the at least one sensor element (52) which has an optical, magnetic, inductive, capacitive or other electronic sensor. Sensor bearing system according to one of claims 1 to 5, characterized in that the sensor ring (52) is a magnetic sensor ring which is magnetized with several magnetic poles distributed over its circumference, wherein magnetic north poles and south poles alternate. Drive device (10) with a sensor bearing system according to one of claims 1 to 6 . Drive device according to claim 7, characterized in that it is designed as a belt drive (10), wherein the sensor bearing system (50, 52) is designed for rotary bearing and position detection of the output shaft (38).

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