Measuring assembly comprising a measuring pin

Abstract

The invention relates to a measuring assembly comprising a receiving component (1) with a conical cutout (2) and a measuring pin (3) with a conical outer circumferential surface (4) which is designed to at least partly correspond to the conical cutout, wherein the measuring pin (3) is at least partly provided in the conical cutout (2) and has at least one sensor (5) at the end which is directed into the conical cutout (2) and tensioning means (6) at the end which is directed out of the conical cutout (2) for generating a pre-tension between the conical cutout (2) and the conical outer circumferential surface (4). According to the invention, the measuring pin (3) is first axially inserted at least partly into the conical cutout (2), the tensioning means (6) for generating a pre-tension between the conical cutout (2) and the conical outer circumferential surface (4) of the measuring pin (3) is then screwed onto the measuring pin (3) end directed out of the conical cutout (2), and the sensor (5) is used at the measuring pin (3) end directed into the conical cutout (2) in order to check that the required pre-tension is achieved.

Description

[0001] P241399 DE

[0002] Measuring setup with a measuring bolt

[0003] The invention relates to a measuring arrangement with a receiving component having a recess and a measuring bolt arranged therein with at least one sensor.

[0004] For example, DE 102011 087 471 A1 discloses a component with a material recess and with a material element that contains at least one sensor, wherein the material element is force-fitted into the material recess and the material recess is flush at least on one side.

[0005] Furthermore, DE 102019 104 790 A1 discloses a component arrangement comprising a force-measuring bolt with at least one strain gauge for detecting and monitoring a state variable, wherein the force-measuring bolt is arranged in an arrangement component along a force or moment flow path of the state variable. Furthermore, at least one groove is provided in the cylindrical surface of the force-measuring bolt and / or in the surface of the arrangement component opposite this cylindrical surface.

[0006] DE 92 19210 U1 further describes a sensor for strain measurement in a bore of a component.

[0007] At least one strain gauge is arranged on the circumference of a cylindrical body made of elastic material and can be pressed against the bore wall by clamping means, whereby an axial force is exerted on the body by the clamping means in order to cause a deformation of the body in the radial direction, so that the strain gauge is positively connected to the bore wall by frictional forces in order to measure the strain produced by force acting on the component containing the bore.

[0008] WO 2019 / 232 675 A1 describes a method for measuring the preload of a bolted assembly. P241399 DE

[0009] US Patent 4,429,579 A describes a tension sensor with an axially extendable bore formed in the tie rod to accommodate a strain gauge element. One end of the gauge element is countersunk to receive a ball that concentrates the load when pressed against the bottom of the bore by a bolt screwed into the bore opening. The gauge element includes a narrow central shaft section on which multiple strain gauges are mounted. The bolt is used to preload the gauge element so that the mounted strain gauges measure changes in tie rod tension.

[0010] The object of the invention is to provide an alternative measuring arrangement comprising a receiving component and a measuring pin arranged therein. In particular, the overlap and preload between the recess in the receiving component and the measuring pin should be easily adjustable. This object is achieved by the subject matter of claim 1. Preferred embodiments are described in the dependent claims, the description, and the figures.

[0011] A measuring arrangement according to the invention comprises a receiving component with a conical recess and a measuring bolt with a conical outer circumferential surface formed at least partially corresponding to it, wherein the measuring bolt is arranged at least partially in the conical recess, wherein the measuring bolt furthermore has at least one sensor at an end directed into the conical recess, and wherein the measuring bolt has clamping means at an end directed out of the conical recess for generating a preload between the conical recess and the conical outer circumferential surface.

[0012] The receiving component can, for example, be part of a housing or part of a bearing and is preferably made of a metal. The measuring bolt can be configured as a force-measuring bolt, wherein the at least one sensor comprises, for example, a strain gauge. The outer geometry of the measuring bolt is at least partially or completely adapted to the inner geometry of the recess. Thus, the pitch on the outer geometry of the measuring bolt and the pitch on the inner geometry of the recess are identical in at least one overlap section. For example, the conical outer circumferential surface extends over at least 70% or at least 90% of the total axial length of the measuring bolt. For example, the conical outer circumferential surface extends over the entire axial length of the measuring bolt. A preload is generated between the recess and the measuring bolt via the clamping device in conjunction with the conical contact surfaces.The clamping device is designed to apply a force to the measuring bolt that precisely pre-tensions the measuring bolt in the recess.

[0013] According to one embodiment, the measuring pin has a larger diameter at the end pointing into the conical recess than at the end pointing out of the conical recess. In other words, the measuring pin is inserted into the conical recess with the end designed to protrude at least partially from it in the fully assembled state, the recess tapering in the insertion direction. This allows the measuring pin to be positioned precisely. Thus, the recess is designed as a through-hole, with the measuring pin closing the recess on one side.

[0014] According to one embodiment, the measuring bolt has a thread at the end protruding from the conical recess, which interacts with a screw, the screw being supported at least indirectly on an end face of the receiving component to draw the measuring bolt into the conical recess. For example, the thread is formed on a cylindrical stub of the measuring bolt, the screw being designed as a nut and screwed onto the cylindrical stub to adjust the preload. Alternatively, a threaded bore is formed on the measuring bolt, the screw being designed as a screw and screwed into the threaded bore to adjust the preload. Preferably, a washer is arranged axially between the screw and the end face of the receiving component. This allows the preload to be adjusted precisely.

[0015] According to one embodiment, the measuring pin has a smaller diameter at the end pointing into the conical recess than at the end pointing out of the conical recess. In other words, the measuring pin is inserted into the conical recess with the end designed to protrude into it when fully assembled, the recess tapering in the insertion direction. For example, the recess is designed as a blind hole, so that the measuring pin closes the recess. Alternatively, the recess is designed as a through hole, with the measuring pin closing the recess on one side.

[0016] According to one embodiment, a screw is arranged at the end of the measuring bolt protruding from the conical recess. The screw is supported by a support element that is rigidly connected to the receiving component, in order to press the measuring bolt into the conical recess. In particular, the support element has a threaded bore for receiving the screw, which is designed as a screw and presses axially against the measuring bolt to position it. Preferably, the support element is connected to the receiving component by means of further screws. Alternatively, other detachable or non-detachable joining methods are also applicable.

[0017] According to one embodiment, a screw is arranged at the end of the measuring bolt protruding from the conical recess. The screw has an external thread that interacts with an internal thread on the receiving component to press the measuring bolt into the conical recess. Preferably, the screw is designed as a clamping nut and has an internal hexagon socket for tool retention. For example, the end of the measuring bolt protruding from the conical recess is connected to the screw via a groove. In particular, the clamping nut has a central recess that at least partially receives the protruding end of the measuring bolt and engages positively in the groove on the measuring bolt. The groove enables rotational decoupling of the measuring bolt and the screw when the measuring bolt is withdrawn.

[0018] The invention also relates to a method for manufacturing a measuring arrangement according to the invention, wherein the measuring bolt is first inserted axially, at least partially, into the conical recess, and wherein the clamping device is then screwed onto the end of the measuring bolt protruding from the conical recess to generate a preload between the conical recess and the conical outer circumferential surface of the measuring bolt, and wherein the sensor is used at the end of the measuring bolt protruding into the conical recess to monitor whether the required preload has been achieved. Thus, during the assembly of the measuring bolt, the preload force between the measuring bolt and the recess can be detected and monitored via the sensor on the measuring bolt. The screwing action on the clamping device generates an axial force on the measuring bolt, which can be monitored and precisely adjusted during assembly.After installation, the measuring bolt uses the sensor to detect state variables in or on the receiving component.

[0019] Further measures improving the invention are described in more detail below, together with a description of preferred embodiments of the invention, with reference to the figures.

[0020] Figure 1 shows a highly simplified schematic sectional view of a measuring arrangement according to the invention in a first embodiment,

[0021] Figure 2 is a highly simplified schematic and partially cutaway perspective view of the measuring arrangement according to the first embodiment of the invention, P241399 DE

[0022] Figure 3 shows a highly simplified schematic sectional view of the measuring arrangement according to a second embodiment of the invention.

[0023] Figure 4 shows a highly simplified schematic and partially cutaway perspective view of the measuring arrangement according to the second embodiment of the invention.

[0024] Figure 5 shows a highly simplified schematic sectional view of the measuring arrangement according to the invention in a third embodiment and

[0025] Figure 6 shows a highly simplified schematic and partially cutaway perspective view of the measuring arrangement according to the third embodiment of the invention.

[0026] Figures 1 and 2 show a measuring arrangement according to a first embodiment comprising a receiving component 1 with a conical recess 2 and a measuring bolt 3 with a correspondingly shaped conical outer circumferential surface 4. The measuring bolt 3 is arranged with its conical geometry completely within the conical recess 2 and has an end extending into the conical recess 2 with a sensor 5 and an end extending out of the conical recess 2, on which clamping means 6 are arranged. The recess 2 is designed as a through-hole. In this embodiment, the measuring bolt 3 has a larger diameter at the end extending into the conical recess 2 than at the end extending out of the conical recess 2. The sensor 5, for example, is arranged as a meandering strain gauge on the end face with the larger diameter that points into the conical recess 2.The clamping device 6 is designed to generate a preload between the conical recess 2 and the conical outer circumferential surface 4 of the measuring bolt 3 and consists of a screw element 8 designed as a nut, which engages with a thread 7 on the end of the measuring bolt 3 protruding from the conical recess 2, and a washer 9, which is arranged axially between the screw element 8 and the end face of the receiving component 1, so that the screw element 8 is indirectly supported on the end face of the receiving component 1 via the washer 9 in order to pull the measuring bolt 3 into the conical recess 2. The screw element 8 is screwed onto a cylindrical stub 17 on the protruding end of the measuring bolt 3 and is supported on the receiving component via the washer 9, thereby exerting a tensile force on the measuring bolt 3.By tightening the nut, a targeted preload can be generated between measuring bolt 3 and receiving component 1 and precisely adjusted by monitoring the sensor signal.

[0027] Figures 3 and 4 show a measuring arrangement according to a second embodiment comprising a receiving component 1 with a conical recess 2 and a measuring pin 3 with a correspondingly shaped conical outer circumferential surface 4. The measuring pin 3, with its conical geometry, is almost completely positioned within the conical recess 2 and has an end extending into the conical recess 2 with a sensor 5 and an end extending out of the conical recess 2, on which clamping means 6 are arranged. In this embodiment, the measuring pin 3 has a smaller diameter at the end extending into the conical recess 2 than at the end extending out of the conical recess 2. The recess 2 is designed as a blind hole. The sensor 5, for example, is a meandering strain gauge arranged at the end face of the end extending into the conical recess 2 with the smaller diameter.The clamping device 6 is designed to generate a preload between the conical recess 2 and the conical outer circumferential surface 4 of the measuring bolt 3 and consists of a screw-type fastener 10, which is supported by a threaded bore 12 on a support element 11 that is fixedly connected to the receiving component 1, in order to press the measuring bolt 3 into the conical recess 2. In this case, the support element 11 is connected to the receiving component 1 by screws 18. The fastener 10 is screwed into the threaded bore 12 on the support element 11 and presses axially on the protruding end of the measuring bolt 3, thereby pressing the measuring bolt 3 into the conical recess. By tightening the fastener 10, a controlled P241399 DE.

[0028] Preload is generated between measuring bolt 3 and receiving component 1 and precisely adjusted by monitoring the sensor signal.

[0029] Figures 5 and 6 show a measuring arrangement according to a third embodiment comprising a receiving component 1 with a conical recess 2 and a measuring pin 3 with a correspondingly shaped conical outer circumferential surface 4. The measuring pin 3, with its conical geometry, is almost completely positioned within the conical recess 2 and has an end extending into the conical recess 2 with a sensor 5 and an end extending out of the conical recess 2, on which clamping means 6 are arranged. In this embodiment, the measuring pin 3 has a smaller diameter at the end extending into the conical recess 2 than at the end extending out of the conical recess 2. The recess 2 is designed as a blind hole. The sensor 5, for example, is a meandering strain gauge arranged at the end face of the end extending into the conical recess 2 with the smaller diameter.The clamping device 6 is designed to generate a preload between the conical recess 2 and the conical outer circumferential surface 4 of the measuring bolt 3 and consists of a screw element 13 designed as a clamping nut, which is arranged on the end of the measuring bolt 3 extending from the conical recess 2. The screw element 13 has an external thread 14 that engages with an internal thread 15 on the receiving component 1 to press the measuring bolt 3 into the conical recess 2. In this case, the measuring bolt 3 is connected to the screw element 13 at the end extending from the conical recess 2 via a groove 16 formed therein. The screw element 13 has a central bore for receiving and axially fixing the measuring bolt 3. The measuring bolt 3 and the screw element 13 are not rotationally fixed to each other.The screw 13 is screwed into the internal thread 15 on the receiving component 1 and exerts axial pressure on the protruding end of the measuring bolt 3, thereby pressing the measuring bolt 3 into the conical recess 2. By tightening the screw 13, a controlled preload can be generated between the measuring bolt 3 and the receiving component 1 and precisely adjusted by monitoring the sensor signal. P241399 DE.

[0030] List of reference signs

[0031] 1 Mounting component

[0032] 2 conical recesses

[0033] 3 measuring bolts

[0034] 4 conical outer peripheral surfaces

[0035] 5 Sensor

[0036] 6 clamping devices

[0037] 7 threads

[0038] 8 Screws

[0039] 9 disc

[0040] 10 screwdriving tools

[0041] 11 Support element

[0042] 12 threaded holes

[0043] 13 Screws

[0044] 14 external threads

[0045] 15 internal threads

[0046] 16 Nut

[0047] 17 stump

[0048] 18 screw

Claims

P241399 DE Patent claims 1. Measuring arrangement comprising a receiving component (1) with a conical recess (2) and a measuring bolt (3) with a conical outer circumferential surface (4) formed at least partially corresponding to it, wherein the measuring bolt (3) • is arranged at least partially in the conical recess (2), • has at least one sensor (5) at an end directed into the conical recess (2) and • has a clamping device (6) at an end extending out of the conical recess (2) to generate a prestress between the conical recess (2) and the conical outer circumferential surface (4).

2. Measuring arrangement according to claim 1, characterized in that the measuring bolt (3) has a larger diameter at the end directed into the conical recess (2) than at the end directed out of the conical recess (2).

3. Measuring arrangement according to claim 2, characterized in that the measuring bolt (3) has a thread (7) at the end extending out of the conical recess (2), which cooperates with a screw means (8), wherein the screw means (8) is supported at least indirectly on an end face of the receiving component (1) in order to pull the measuring bolt (3) into the conical recess (2).

4. Measuring arrangement according to claim 3, characterized in that a disk (9) is arranged axially between the screw means (8) and the end face of the receiving component (1 ).

5. Measuring arrangement according to claim 1 , P241399 DE characterized in that the measuring pin (3) has a smaller diameter at the end directed into the conical recess (2) than at the end directed out of the conical recess (2).

6. Measuring arrangement according to claim 5, characterized in that a screw means (10) is arranged on the end of the measuring bolt (3) extending out of the conical recess (2), wherein the screw means (10) is supported on a support element (11) which is firmly connected to the receiving component (1) in order to press the measuring bolt (3) into the conical recess (2).

7. Measuring arrangement according to claim 6, characterized in that the support element (11 ) has a threaded bore (12) for receiving the screw means (10).

8. Measuring arrangement according to claim 5, characterized in that a screw means (13) is arranged at the end of the measuring bolt (3) extending out of the conical recess (2), wherein the screw means (13) has an external thread (14) which interacts with an internal thread (15) on the receiving component (1) to press the measuring bolt (3) into the conical recess (2).

9. Measuring arrangement according to claim 8, characterized in that the measuring bolt (3) is connected to the screw means (13) at the end extending out of the conical recess (2) via a groove (16).

10. Method for manufacturing a measuring arrangement according to one of the preceding claims, wherein the measuring bolt (3) is first inserted axially, at least partially, into the conical recess (2), wherein the clamping means (6) is then attached to the end of the measuring bolt (3) extending out of the conical recess (2) to generate a preload between the conical recess (2) and the P241399 DE is screwed to the conical outer circumferential surface (4) of the measuring bolt (3), wherein the sensor (5) is used at the end of the measuring bolt (3) directed into the conical recess (2) to monitor the achievement of the required preload.

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