System having a transmission, support structure and torque support mounted therebetween with strain gauges

Abstract

A system having a torque support mounted between a transmission and a device to be driven by the transmission, wherein the transmission output shaft, which is rotatably mounted by means of bearings, in particular rolling bearings, accommodated in the transmission housing, is connected for conjoint rotation to a shaft of the device to be driven, said shaft being rotatably mounted by means of bearings, in particular rolling bearings, accommodated in the housing of the device to be driven, wherein the torque support has a first fastening region, a second fastening region and connecting regions, wherein the first fastening region is connected to a second fastening region by means of connecting regions, wherein respective strain gauges are mounted in the respective connecting regions, wherein the first fastening region is connected for conjoint rotation to the transmission housing, wherein the second fastening region is connected for conjoint rotation to the housing of the device to be driven.

Description

[0001] system

[0002] Description:

[0003] The invention relates to a system.

[0004] It is generally known that a torque support transfers the reaction torque of a gearbox to a component of the housing of the device driven by the gearbox or to a component connected to that housing.

[0005] From DE 11 2017 000 245 B4, a method for monitoring a gearbox is known as the closest prior art.

[0006] A method for measuring shear forces is known from DE 10 2013 202 647 A1.

[0007] A force measuring sensor is known from EP 3 239 676 A1.

[0008] The function of a torque support is to absorb the differential torque between the input and output shafts and transfer it to a supporting structure, in particular the housing of a driven device, a frame, or a rack. The supporting structure is either a part, in particular a housing part, of the driven device, or the driven device is attached to and / or connected to the supporting structure.

[0009] The invention is therefore based on the objective of achieving a precise detection and / or determination of the reaction moment.

[0010] According to the invention, the problem is solved in the system according to the features specified in claim 1.

[0011] Key features of the system are that the system has a torque support located between a gearbox and a device to be driven by the gearbox, wherein the driven shaft of the gearbox, rotatably mounted by means of bearings, in particular rolling bearings, housed in the gearbox housing, is connected to a device to be driven by means of bearings, in particular rolling bearings, housed in the gearbox housing.

[0012] ISI \ EIDOPAT 16.09.2025, the torque support is rotatably connected to the bearings, in particular rolling bearings, of the driven device, wherein the torque support has a first mounting area, a second mounting area and web areas, wherein the first mounting area is connected to a second mounting area by means of web areas, wherein a respective strain gauge is attached to the respective web area, wherein the first mounting area is non-rotatably connected to the gearbox housing, wherein the second mounting area is non-rotatably connected to a support structure, in particular wherein the support structure is part of the driven device or is connected to the driven device, in particular wherein the driven device is attached to the support structure.

[0013] A key advantage is the ability to precisely measure and / or determine the reaction torque. During gearbox operation, i.e., when transmitting torque, the reaction torque is transmitted through the torque arm via the web sections from the first to the second mounting point. As the torque is transmitted, the web sections are either compressed or stretched, and the resulting change in length can be measured by determining the correspondingly different resistances of the respective strain gauges. Unlike a solid body, the compression or stretching of the web sections is spatially clearly defined and measurable within the respective web section. This enables precise measurement and / or determination of the reaction torque transmitted through the torque arm.

[0014] In an advantageous embodiment, the strain gauges are electrically interconnected in a Wheatstone bridge. This offers the advantage of achieving high precision in torque determination, particularly with a high signal-to-noise ratio.

[0015] In an advantageous embodiment, a first web area is connected to the first fastening area at its first end area, a second web area is connected to the first fastening area at its first end area, a third web area is connected to the second fastening area at its first end area, a fourth web area is connected to the second fastening area at its first end area, the first web area is connected to the third web area at its second end area, the second web area is connected to the fourth web area at its second end area, in particular wherein the second end area of ​​the first web area is spaced apart from the second end area of ​​the second web area, in particular wherein the second end area of ​​the third web area is spaced apart from the second end area of ​​the fourth web area.An advantage of this design is that two web sections are connected, and the resulting pair contributes to transmitting the torque. The web sections of each pair are not parallel to each other, but rather aligned at a non-zero angle. Thus, when the other web section of the pair is stretched, one of the two web sections is compressed. Because of this angled orientation, a highly differential change in length within each pair can be achieved, resulting in high precision in measuring and / or determining the reaction torque.

[0016] In an advantageous embodiment, during a first direction of rotation of the driving shaft, the first web area is compressed and the resistance of a first strain gauge attached to the first web area depends, in particular proportionally, on the compression of the first web area; the second web area is stretched and the resistance of a first strain gauge attached to the second web area depends, in particular proportionally, on the elongation of the second web area; the third web area is stretched and the resistance of a third strain gauge attached to the third web area depends, in particular proportionally, on the elongation of the third web area; the fourth web area is compressed and the resistance of a first strain gauge attached to the fourth web area depends, in particular proportionally, on the compression of the fourth web area.The advantage here is that large differences between the resistances can be achieved, thus allowing for high precision in determining the reaction moment.

[0017] In an advantageous embodiment, the connection line links the center point or centroid of the first fastening area with the center point or centroid of the second fastening area, wherein the first and third web areas are arranged on the opposite side from the second and fourth web areas. It is advantageous that the torque is transmitted via the two paths formed by the web areas and can therefore be determined unambiguously and precisely.

[0018] In an advantageous embodiment, the axis of rotation of the driven shaft and the connecting line that links the center point or centroid of the first mounting area with the center point or centroid of the second mounting area form a plane that separates a spatial region accommodating the first and third web sections from a spatial region accommodating the second and fourth web sections. An advantage of this is that, due to a symmetrical design, the difference in resistance between the upper and lower paths can be used for precise torque determination, with the upper path being formed by the first and third web sections and the lower path being formed by the second and fourth web sections.

[0019] In an advantageous embodiment, the strain gauges are electrically interconnected such that a series circuit formed from the first strain gauge and the second strain gauge is electrically connected in parallel with a series circuit formed from the third strain gauge and the fourth strain gauge, in particular wherein the parallel circuit thus formed is supplied by a DC voltage source and the upper potential of the DC voltage source is connected to a first terminal of the first strain gauge and to a first terminal of the third strain gauge, in particular wherein the lower potential of the DC voltage source is connected to a first terminal of the second strain gauge and to a first terminal of the fourth strain gauge.The voltage applied between the center taps of the two series circuits is measured as a measure of the torque transmitted through the torque arm. An advantage of this method is that the highest possible sensitivity can be achieved during the measurement.

[0020] In an advantageous embodiment, a fifth web section is connected at its first end to the second mounting area and at its second end to the second end of the first and third web sections. An advantage of this is that additional strain gauges can be attached, thus enabling a further improved determination of the reaction torque.

[0021] In an advantageous embodiment, a sixth web section is connected at its first end to the second mounting area and at its second end to the second end of the second and fourth web sections. An advantage of this is that the two web sections can be arranged at an angle to each other, so that when a torque is transmitted, particularly a reaction torque, one of them is stretched and the other compressed, rather than both being stretched simultaneously. A further advantage is that additional strain gauges can be attached, thus enabling a more precise determination of the reaction torque.

[0022] In an advantageous embodiment, the first fastening area is designed as the first ring area. The advantage here is that a fastening element can project through the first ring area and be attached to the gearbox housing, in particular by being screwed into a threaded bore.

[0023] In an advantageous embodiment, the second fastening area is designed as a second ring area. The advantage here is that the second fastening element can protrude through the second ring area and be attached to the supporting structure.

[0024] In an advantageous embodiment, the first, second, third, and fourth web sections jointly define and / or surround a recess extending through the torque support. The advantage here is that the torque is transmitted through the surround and can therefore be precisely detected.

[0025] In an advantageous embodiment, the axis of rotation of the driven shaft and the connecting line that spans the center point or center of gravity of the first mounting area with the center point or center of gravity of the second mounting area form a plane, in particular a plane of mirror symmetry of the torque support, wherein the torque support is designed to be mirror-symmetrical to this plane. An advantage of this is that uniform compression or elongation is possible in the symmetrically arranged web areas.

[0026] In an advantageous embodiment, the first mounting area is arranged in a frame section of the torque support, which has further mounting areas at which the torque support is connected to the gearbox housing, wherein the frame section borders and / or surrounds a further recess extending through the torque support. An advantage of this is that improved mounting of the torque support is enabled.

[0027] In a preferred design, the torque support is made of steel. The advantage here is that high torques can be transmitted.

[0028] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0029] The invention will now be explained in more detail with reference to schematic illustrations:

[0030] Figure 1 shows a torque support 4 of an arrangement according to the invention, in particular a system according to the invention, for determining the torque, in particular reaction torque, in an oblique view.

[0031] Figure 2 shows the torque support 14 in a top view.

[0032] Figure 3 shows a gearbox with a torque support 14 attached.

[0033] Figure 4 shows the compressions and expansions occurring at the torque support 14 when the shaft is rotating in the direction of rotation 40.

[0034] Figure 5 shows the electrical interconnection of the strain gauges (1 , 2, 3, 4) in a Wheatstone bridge.

[0035] As shown in the figures, the arrangement has a torque support 14 which is attached to the housing 30 of a gearbox, the output shaft of which is rotated in the direction of rotation 40 and the torque delivered via the output shaft of which is to be determined by the arrangement.

[0036] Preferably, an electric motor is mounted on the input side of the gearbox, the rotor shaft of which functions as the input shaft of the gearbox or is non-rotatably connected to the input shaft of the gearbox, wherein the housing of the electric motor is rigidly connected to the housing 30 of the gearbox.

[0037] The torque support 14 has a first and second mounting area (5, 6) and two further mounting areas 15 through which screws protrude, their threaded sections being screwed into threaded bores provided in the housing 30. Thus, the torque support 14 is pressed against the housing 30 by the screw heads and connected by friction and / or force.

[0038] In the further mounting area 7, a ring-shaped buffer is accommodated through which an axle or further screw protrudes, which is attached to the supporting structure. The mounting areas (5, 6, 7) are connected to each other via web sections (8, 9, 10, 11, 12, 13) of the torque support 14.

[0039] In operation, the gearbox transmits a torque to the driven device of the system via the driven shaft, which rotates in direction 40. For this purpose, the driven shaft is connected to a shaft of the driven shaft. This transmits a reaction torque from the housing 30 to the supporting structure via the torque arm 14.

[0040] The reaction torque is introduced into the supporting structure via the fastening areas 5 and 6, which are connected to the housing 30 by means of the screws; the reaction torque is dissipated via the fastening area 7.

[0041] Some of the bridge sections (8, 9, 10, 11, 12, 13) are compressed or stretched 40 degrees depending on the direction of rotation.

[0042] With the direction of rotation 40 shown in Figure 4, the web areas 8 and 11 as well as 13 are compressed and the web areas 9, 10 and 12 are stretched.

[0043] A strain gauge (1, 2, 3, 4) is attached to each of the web sections (8, 9, 10, 11), so that the resistance of the respective strain gauge (1, 2, 3, 4) changes accordingly. The resistance of strain gauges 1 and 4 arranged on the stretched web sections 9 and 10 changes in the same way relative to each other, particularly under the same stress state, whereas the resistance of strain gauges 2 and 3 arranged on the stretched web sections 8 and 11 also changes in the same way relative to each other, particularly under the same stress state.

[0044] To achieve the best possible signal-to-noise ratio, the strain gauges (1, 2, 3, 4) are connected in a Wheatstone bridge, which is designed as a parallel connection of two series circuits, in particular half-bridges, wherein each of the two series circuits has two of the strain gauges (1, 2, 3, 4) connected in series, wherein in the first series circuit, in particular half-bridge, strain gauge 1 arranged on the stretched web area 10 is used as the upper resistance and strain gauge 2 arranged on the compressed web area 11 is used as the lower resistance, and in the second series circuit, in particular half-bridge, strain gauge 4 arranged on the stretched web area 9 is used as the lower resistance and strain gauge 3 arranged on the compressed web area 8 is used as the upper resistance.wherein the difference in potentials at the center tap of the two series circuits is recorded as a differential voltage, in particular which is a measure of the torque to be recorded, especially reaction torque, that is to be transmitted via the torque support from the gearbox housing 30 to the supporting structure.

[0045] The web areas (8, 9, 10, 11, 12, 13) preferably extend apart from each other, wherein the first end areas of the web areas (8, 9, 10, 11, 12, 13) are connected to each other and the respective other end area of ​​each of the web areas (8, 9, 10, 11, 12, 13) is connected either to the fastening area 6 or to the fastening area 7.

[0046] However, web sections 12 and 13 end at mounting area 7, spaced apart from the other mounting areas. This provides increased stiffness for holding the mounting area.

[0047] As shown in Figure 4, the sum of the lengths of the web areas 8 and 10 in their respective directions of greatest extension exceeds the distance between the fastening area 6 and the fastening area 7.

[0048] In the embodiment described here, the fastening areas (5, 6, 7) and the further fastening areas 15 are designed as ring areas, so that a fastening element, such as a screw, buffer, or rivet, can protrude through a recess in the fastening area, thus enabling simple fastening of the torque support 14 to the gearbox housing 30 or to the support structure. Alternatively, a material-fit connection between the gearbox housing 30 and the torque support 14 can also be used, or even a one-piece design of the torque support 14 and the gearbox housing 30. Preferably, the web areas 8 and 10 have an angle of less than 90° to each other, and in particular, more than 20°. Preferably, the web areas 9 and 11 have an angle of less than 90° to each other, and in particular, more than 20°.

[0049] In further embodiments according to the invention, a strain gauge is attached to further web areas, thus enabling an even more precise determination of the torque, in particular the reaction torque.

[0050] Reference symbol list

[0051] 1 strain gauge

[0052] 2 strain gauges

[0053] 3 strain gauges

[0054] 4 strain gauges

[0055] 5 Mounting area

[0056] 6 Mounting area

[0057] 7 Mounting area

[0058] 8 Steg be re ich

[0059] 9 Steg be re ich

[0060] 10 Bridge area

[0061] 11 Bridge area

[0062] 12 Bridge area

[0063] 13 Bridge area

[0064] 14 Torque support

[0065] 15 Mounting area

[0066] 30 Gearbox housings

[0067] 31 screw

[0068] 40 Direction of rotation of the driving shaft

[0069] U voltage

Claims

Patent claims:

1. System comprising a gearbox, a device to be driven by the gearbox, a support structure, in particular of the device, and a torque support mounted between the gearbox and the support structure, wherein the driven shaft of the gearbox, rotatably mounted by means of bearings, in particular rolling bearings, received in the gearbox housing, is non-rotatably connected to a shaft of the driven device, rotatably mounted by means of bearings, in particular rolling bearings, received in the housing of the device to be driven by the gearbox, characterized in that the torque support has a first mounting area, a second mounting area and web areas, wherein the first mounting area is connected to a second mounting area by means of web areas, wherein a respective strain gauge is mounted on the respective web area, wherein the first mounting area is non-rotatably connected to the gearbox housing.wherein the second fastening area is rotationally fixed to the support structure, in particular wherein the support structure is part of the device to be driven or is connected to the device to be driven, in particular wherein the device to be driven is attached to the support structure.

2. System according to claim 1, characterized in that the strain gauges are electrically interconnected in a Wheatstone bridge.

3. System according to one of the preceding claims, characterized in that a first web area (8) is connected at its first end area to the first fastening area, a second web area (9) is connected at its first end area to the first fastening area, a third web area (10) is connected at its first end area to the second fastening area, a fourth web area (11) is connected at its first end area to the second fastening area, the first web area (8) is connected at its second end area to the third web area (10) at its second end area, the second web area (9) is connected at its second end area to the fourth web area (11) at its second end area, in particular wherein the second end area of ​​the first web area (8) is connected to the second The end region of the second web area (9) is spaced apart, in particular wherein the second end region of the third web area (10) is separated from the second The end area of ​​the fourth bridge section (11) is spaced apart. - 15 - 4. System according to one of the preceding claims, characterized in that, in a first direction of rotation of the driving shaft, the first web area (8) is compressed and the resistance of a third strain gauge (3) attached to the first web area (8) depends, in particular proportionally, on the compression of the first web area (8), the second web area (9) is stretched and the resistance of a fourth strain gauge (4) attached to the second web area (9) depends, in particular proportionally, on the elongation of the second web area (9), the third web area (10) is stretched and the resistance of a first strain gauge (1) attached to the third web area (10) depends, in particular proportionally, on the elongation of the third web area (10), the fourth web area (11) is compressed and the resistance of a strain gauge (4) attached to the fourth web area (11) depends, in particular proportionally, on the elongation of the third web area (11) (11) attached second strain gauge (2), in particular proportionally, depends on the compression of the fourth web area (11).

5. System according to one of the preceding claims, characterized in that, with respect to the connecting line which connects the center point or centroid of the first fastening area (6) with the center point or centroid of the second fastening area (7) connects, wherein the first web area (8) and the third web area (10) are arranged on the opposite side to the second and fourth web areas (9, 11). - 16 - 6. System according to one of the preceding claims, characterized in that the axis of rotation of the driving shaft and the connecting line which connects the center point or center of gravity of the first mounting area (6) with the center point or center of gravity of the second mounting area (7) span a plane which separates a spatial area accommodating the first web area (8) and the third web area (10) from a spatial area accommodating the second web area (9) and the fourth web area (11).

7. System according to one of the preceding claims, characterized in that the strain gauges are electrically interconnected such that a series circuit formed from the first strain gauge (3) with the second strain gauge (4) is electrically connected in parallel with a series circuit formed from the third strain gauge (1) and the fourth strain gauge (2), in particular wherein the parallel circuit thus formed is supplied by a DC voltage source and the upper potential of the DC voltage source is connected to a first terminal of the first strain gauge (3) and to a first terminal of the third strain gauge (1), in particular wherein the lower potential of the DC voltage source is connected to a first terminal of the second strain gauge (4) and to a first terminal of the fourth strain gauge (2),the voltage applied between the center taps of the two series circuits is recorded as a measure of the torque transmitted through the torque arm. - 17 - 8. System according to one of the preceding claims, characterized in that a fifth web area (12) is connected with its first end area to the second fastening area (7) and with its second end area to the second end areas of the first web area (8) and the third web area (10).

9. System according to one of the preceding claims, characterized in that a sixth web area (13) is connected with its first end area to the second fastening area (7) and with its second end area to the second end areas of the second web area (9) and the fourth web area (11).

10. System according to one of the preceding claims, characterized in that the first fastening area is designed as a first ring area.

11. System according to one of the preceding claims, characterized in that the second fastening area is designed as a second ring area.

12. System according to one of the preceding claims, characterized in that the first web area (8), the second web area (9), the third web area (10) and the fourth web area (11) jointly border and / or surround a recess through the torque support. - 18 - 13. System according to one of the preceding claims, characterized in that the axis of rotation of the driving shaft and the connecting line which connects the center point or center of gravity of the first mounting area (6) with the center point or center of gravity of the second mounting area (7) span a plane, in particular a plane of mirror symmetry of the torque support, wherein the torque support is designed to be mirror-symmetrical to this plane.

14. System according to one of the preceding claims, characterized in that the first fastening area is arranged in a frame section of the torque support, which has further fastening areas (15) at which the torque support is connected to the gearbox housing, in particular wherein the frame section borders and / or surrounds a further recess through the torque support.

15. System according to one of the preceding claims, characterized in that the torque support is made of steel and / or that the torque support is additively manufactured.

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