WO2024217758A1

WO2024217758A1 - System comprising a gear and a testing machine

Info

Publication number: WO2024217758A1
Application number: PCT/EP2024/055141
Authority: WO
Inventors: Zili Wu; Lech BANASIK
Original assignee: Sew-Eurodrive Gmbh & Co Kg
Priority date: 2023-04-17
Filing date: 2024-02-28
Publication date: 2024-10-24
Also published as: DE102024105651A1

Abstract

The invention relates to a system comprising a gear and a testing machine, having - a turntable that can be rotated by an electric drive, - a first linear axis, - a second linear axis, - a pinion connected in a rotationally fixed manner to a shaft, - a second drive, wherein brackets are connected in a rotationally fixed manner to the turntable, wherein the gear is connected to the turntable in a rotationally fixed manner by means of the brackets, wherein the pinion is engaged with the gear.

Description

System comprising a gear and a testing machine

Description:

The invention relates to a system comprising a gear and a testing machine.

It is generally known that a linear axis is a machine element for components that can be moved along a straight line.

From DE 10 2011 011 946 A1, a method for measuring and testing a workpiece is known as the closest prior art.

A gear testing machine is known from CN 1 03 969 B.

A gear positioning device is known from DE 11 2018 005 472 T5.

A segmented gear ring is known from US 2014 / 0 208 880 A1.

A transmission testing machine is known from CN 2 13 616 064 U.

The invention is therefore based on the object of making the testing machine capable of testing the gear under operating conditions.

According to the invention, the object is achieved according to the features specified in claim 1.

Important features of the invention in the system comprising a gear and a testing machine are that the system comprises a rotary table rotatable by an electric drive, a first linear axis, a second linear axis, a pinion connected in a rotationally fixed manner to a shaft, a second drive, in particular for the shaft, wherein holders are connected to the turntable in a rotationally fixed manner, wherein the gear is connected to the turntable in a rotationally fixed manner by means of the holders, wherein the pinion is in engagement with the gear, in particular wherein the teeth of the pinion are in engagement with the teeth of the gear, wherein the axial distance between the gear and the pinion is controllable by means of the second linear axis, wherein the axial position of the pinion related to the axial position of the gear is controllable by means of the first linear axis, in particular wherein the pinion can be braked by means of the second drive or wherein the torque transmitted from the electrical second drive of the gear to the pinion via the gear is transmitted to the second drive.

The advantage here is that the sound generated when the gear rotates can be monitored using the testing machine. The sound, in particular structure-borne sound, is preferably detected by a sensor and the sensor signal is subjected to a Fourier analysis and the spectrum thus created is monitored for exceeding a threshold value assigned to a respective frequency range. In addition, other tooth engagement conditions can be monitored using the testing machine, such as the contact surface during tooth engagement and the play, in particular the flank play, of the tooth engagement. In addition, the concentricity and the other parameters for the precision of the assembly of the gear, in particular the relative alignment of the segments to one another, can be checked. For this purpose, at least one corresponding sensor is also arranged in the testing machine.

It is also important that the axis of rotation of the gear is aligned vertically, although in real operating conditions, for example in a cement mill, the gear is intended to operate with a horizontally aligned axis of rotation. The operation of the gear is therefore intended in a different orientation than in the testing machine, whereby the axis of rotation in the intended operation is aligned perpendicular to the axis of rotation of the gear in the testing machine.

In an advantageous embodiment, the shaft has a shaft piece that is connected in a rotationally fixed manner by means of a chuck to an adapter shaft that can be set in rotation or braked by a second drive, wherein an electromagnetically actuated brake or clutch is arranged on the second drive, in particular wherein the second drive comprises an electric motor, in particular which is supported on the lower holding arm. The advantage here is that the shaft piece with the pinion pushed onto it can be replaced with another shaft piece, wherein the second drive driving the shaft piece does not have to be replaced but can be retained.

In an advantageous embodiment, the gear has segments arranged one behind the other in the circumferential direction, wherein the segments closest to one another are connected to one another by means of screws, in particular wherein each segment has a toothed area. It is advantageous that the gear is designed in segments and is held during operation by another component, such as a drum, in particular a cement drum, of a cement mill. Since the testing machine lacks the component that attaches the gear, the gear is held by a large number of holders. The segments are screwed together.

The segments enable the production of a large gear using a small gear cutting machine, which finely processes the toothed area of the segment, in particular by milling or grinding it. In particular, the gear is therefore larger than the gear cutting machine used. The gear can also be manufactured on a gear cutting machine that is small in comparison to the gear.

In an advantageous embodiment, the number of segments is equal to the number of holders, in particular where each segment is attached to the rotary table by at least one of the holders. It is advantageous that each segment is held individually by at least one holder. In particular, however, the holding is also improved by the screw connection of the segments to one another.

In an advantageous embodiment, the first linear axis is aligned perpendicular to the second linear axis. The advantage here is that on the one hand the axis distance, i.e. the radial position of the pinion, can be controlled and on the other hand the axial relative position of the pinion to the gear wheel.

In an advantageous embodiment, the rotation axis of the pinion is aligned parallel to the first linear axis, in particular vertically aligned. The advantage here is that the axial position of the pinion is adjustable and thus the width of the tooth engagement is also adjustable.

In an advantageous embodiment, the axis of rotation of the gear is aligned parallel to the first linear axis and/or to the axis of rotation of the pinion, in particular vertically aligned. The advantage here is that the pinion and the gear can be designed with spur gear teeth.

In an advantageous embodiment, the maximum diameter of the rotary table is smaller than the maximum diameter of the gear. The advantage here is that the gear can be larger than the rotary table and thus the gear ring would fall off the rotary table if the brackets were missing. The gear can be attached to the rotary table using the brackets, with the axis of the gear aligned coaxially to the axis of rotation of the rotary table. In an advantageous embodiment, the gear is designed as a ring and/or as a gear rim, the maximum diameter of the rotary table being smaller than the clear inner diameter of the gear, in particular the radial distance area covered by the holders overlapping the radial distance area covered by the rotary table and the radial distance area covered by the gear, in particular the rotary table being radially spaced from the gear. The advantage here is that the gear designed as a gear rim can be precisely assembled from segments, because the deviations from the target position and target alignment can be limited to a permissible level using the testing machine.

In an advantageous embodiment, the second linear axis is aligned perpendicular to the axis of rotation of the pinion and perpendicular to the axis of rotation of the gear,

In an advantageous embodiment, the pinion can be brought into engagement with the gearwheel using the second linear axis. The advantage here is that the pinion can be positioned radially towards the gearwheel using the second linear axis.

In an advantageous embodiment, the first holding arm and the second holding arm spaced apart from the first holding arm can be moved by the second linear axis, in particular in the vertical direction. It is advantageous that the vertical height of the pinion can be adapted to the vertical position of the gear.

In an advantageous embodiment, a support bearing which rotatably supports the shaft is accommodated in the second, in particular lower, holding arm, and/or a bearing which rotatably supports the shaft is accommodated in the first holding arm. It is advantageous in this case that the support bearing is positioned against a step of the second holding arm. In an advantageous embodiment, a sensor, in particular a structure-borne sound sensor and/or angle sensor, is arranged on the second holding arm and can be moved along with the holding arm, in particular when the linear axes move. The advantage here is that the values of a physical quantity, in particular structure-borne sound, can be recorded as close as possible to the engagement area.

In an advantageous embodiment, a mandrel area is formed on the second holding arm, which supports the shaft. The advantage here is that the shaft is stably mounted.

In an advantageous embodiment, the holders protrude radially above the rotary table, with the area covered by the holders in the axial direction overlapping with the area covered by the rotary table in the axial direction and with the area covered by the gear in the axial direction. The advantage here is that despite the size of the gear, it can be tested on the testing machine. In particular, the gear can be set in rotation by a rotary table that is much smaller than the gear.

In an advantageous embodiment, the axial distance between the gear and the pinion can be controlled by means of the linear position of the second linear axis. The advantage here is that the pinion can be moved towards the gear and brought into engagement.

In an advantageous embodiment, the first linear axis is driven by a first synchronous motor and/or the second linear axis is driven by a second synchronous motor. The advantage here is that the linear axis can be brought to the respective intended linear positions, in particular with high precision.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. The expert will find further reasonable combination possibilities of claims and/or individual claim features and/or features of the description and/or the figures, in particular from the task and/or the task arising from comparison with the prior art.

The invention will now be explained in more detail using schematic illustrations:

Figure 1 shows a testing device according to the invention, in particular a testing machine, for a segmented gear 1 in side view, wherein the gear is in engagement with a pinion 2.

In Figure 2, an area of the pinion 2 is schematically sketched.

As shown in the figures, the testing device has a rotary table 8 which can be set in rotary motion by an electric drive. The axis of rotation of the rotary table 8 is preferably aligned vertically.

Brackets 9 are mounted on the turntable, which hold the segmented gear 1.

The brackets 9 are detachably connected to both the rotary table 8 and the gear 1. The gear 1 is composed of segments which are screwed together.

The segments are arranged one behind the other in the circumferential direction - relative to the axis of rotation of the gear - and are connected to each other by means of tangentially directed screws.

The number of segments of gear 1 is between five and forty.

Each of the segments has a toothing, in particular straight toothing or helical toothing, on its radially outer circumference.

The rotation axis of the rotary table 8 is aligned coaxially to the rotation axis of the gear.

The radial direction is always related to the axis of rotation of the rotary table 8. The axial direction and the circumferential direction are also always related to the axis of rotation of the rotary table. The segments are identical to each other.

The pinion 2, which is in engagement with the gear 1, is driven by the gear 1 and has an axis of rotation aligned parallel to the axis of rotation of the gear 1.

The gear 1 is held by means of holders 9 which are arranged on the rotary table 8. The holders 9 are spaced apart from one another in the circumferential direction, in particular evenly spaced.

The pinion 2 is connected to a shaft piece in a rotationally fixed manner or the pinion 2 is designed as one piece with a shaft piece, in particular as a single piece.

Preferably, the shaft piece is connected in a rotationally fixed manner to a chuck 20 and to an adapter flange 21 and is therefore referred to below as a multi-part shaft 3.

The shaft 3 is rotatably mounted on two holding arms (4, 6), by which it is also held. The axis of rotation of the shaft 3 is preferably aligned vertically.

For this purpose, a lower holding arm 6 accommodates a support bearing 22, which rotatably supports the shaft 3 and supports it from below. A bearing is also accommodated in the upper holding arm 4, which rotatably supports the shaft 3.

The two holding arms (4, 6) are arranged to be displaceable by means of a first linear axis 5.

Thus, the pinion 2 can be moved linearly by means of the first linear axis 5, in particular in the vertical direction.

The first linear axis 5 and thus also the pinion 2 can be displaced, in particular horizontally, by means of a second linear axis 7.

The displacement direction of the first linear axis 5 is preferably aligned perpendicular to the displacement direction of the second linear axis 7. Thus, the axial distance between the rotation axis of the gear and the rotation axis of the pinion can be controlled by means of the linear axis 7.

The axes of rotation of gear 1 and pinion 2 are therefore parallel.

To test the gear 1, the linear axis 7 is moved in such a way that the pinion 2 is in engagement with the gear 1. The tooth engagement can then be checked when the gear 1 is rotated. Since the gear 1 is composed of segments that are screwed together, the engagement condition can be monitored by the test device and thus the precision of the connection of the segments can be checked.

The holders 9 are attached to the rotary table 8 and protrude radially beyond the rotary table 8. This makes it possible to test a gear 1 whose diameter is larger than the maximum diameter of the rotary table 8. The gear 1 cannot therefore be assembled from the segments on the rotary table.

With the vertically directed linear axis 5, the pinion 2 can be moved in the vertical direction and thus aligned with the gear 1.

The rotary table 8 is driven by the electric drive. The pinion 2 is thus driven by the gear 1. In order to achieve a predetermined load during tooth engagement, a drive 23 is provided which transfers the power supplied from the gear 1 to the pinion 2.

The drive 23 can preferably be a synchronous motor, which is preceded by a gearbox.

The support bearing 22 is accommodated in the lower holding arm 6 to rotatably accommodate the pinion 2.

The drive 23 is arranged below the holding arm 6, i.e. on the side of the holding arm 6 facing away from the support bearing 22. An angle sensor 24 of a sensor is arranged on the drive 23 so that a value of the angular position of the shaft 3 can be detected with the sensor. The signals from the sensor are fed to a control system which generates control signals for the drive 23 and for the electric drive of the rotary table 8.

On its front side facing downwards in the direction of gravity, the shaft 3 is supported on a mandrel 26, which acts both as a support and as a centering device. The mandrel 26 is arranged in or on the lower support arm.

Preferably, a clutch or brake 25 is arranged in the direction of gravity below the electric drive 23. Thus, the torque transmission from the shaft 3 to the drive 23 via the clutch or brake 25 can be interrupted, depending on the state of the clutch or brake 25. In this way, the load can be suppressed or controlled.

A shaft sealing ring is arranged axially next to the support bearing 22, which seals the lower holding arm 6 towards the shaft 3.

Each linear axis (5, 7) is preferably driven by a synchronous motor.

Preferably, the electric drive of the rotary table 8 is motor-operated and the drive 23 is operated as a generator. The concentricity of the gear 1 and other parameters of the gear 1 can be checked quickly and easily. However, with motor operation of the second drive 23, in particular and generator operation of the electric drive, i.e. first drive, a test can be carried out which comes closer to the real operating conditions.

In further embodiments according to the invention, the number of segments equals the number of holders 9. Thus, each segment is held by exactly one holder 9. list of reference symbols

1 segmented gear

2 pinions

3rd wave

4 upper support arm

5 Linear axis, vertical

6 lower support arm

7 Linear axis, horizontal

8 turntable

9 bracket

20 chucks

21 adapter shaft

22 support bearings

23 drive

24 angle sensors

25 clutch or brake

26 Thorn

Claims

Patent claims:

1. System comprising a gear and a testing machine, having a turntable rotatable by an electric drive, a first linear axis, a second linear axis, a pinion connected in a rotationally fixed manner to a shaft, a second drive, in particular for the shaft, characterized in that holders are connected in a rotationally fixed manner to the turntable, the gear being connected in a rotationally fixed manner to the turntable by means of the holders, the pinion being in engagement with the gear, in particular the teeth of the pinion being in engagement with the teeth of the gear, the axial distance between the gear and the pinion being controllable by means of the second linear axis, the axial position of the pinion related to the axial position of the gear being controllable by means of the first linear axis, in particular the pinion being braked by means of the second drive or the torque transmitted from the electric second drive of the gear to the pinion via the gear is transmitted to the second drive.

2. System according to claim 1, characterized in that the shaft has a shaft piece which is connected in a rotationally fixed manner by means of a chuck to an adapter shaft which can be set in rotation or braked by the second drive, wherein an electromagnetically actuated brake or clutch is arranged on the second drive, in particular wherein the second drive comprises an electric motor, in particular which is supported on a lower holding arm.

3. System according to one of the preceding claims, characterized in that the gear wheel has segments arranged one behind the other in the circumferential direction, wherein the segments closest to one another are connected to one another by means of screws, in particular wherein each segment has a toothed region.

4. System according to one of the preceding claims, characterized in that the number of segments is equal to the number of holders, in particular wherein each segment is attached to the turntable by at least one of the holders.

5. System according to one of the preceding claims, characterized in that the first linear axis is aligned perpendicular to the second linear axis.

6. System according to one of the preceding claims, characterized in that the axis of rotation of the pinion is aligned parallel to the first linear axis, in particular is aligned vertically, and/or the axis of rotation of the gear is aligned parallel to the first linear axis and/or to the axis of rotation of the pinion, in particular is aligned vertically.

7. System according to one of the preceding claims, characterized in that the maximum diameter of the rotary table is smaller than the maximum diameter of the

Gear and/or that the gear is ring-shaped and/or designed as a gear ring, wherein the maximum diameter of the rotary table is smaller than the clear inner diameter of the gear, in particular wherein the radial distance region covered by the holders overlaps with the radial distance region covered by the rotary table and with the radial distance region covered by the gear, in particular wherein the rotary table is radially spaced from the gear.

8. System according to one of the preceding claims, characterized in that the second linear axis is aligned perpendicular to the axis of rotation of the pinion and perpendicular to the axis of rotation of the gear, and/or that the pinion can be brought into engagement with the gear by means of the second linear axis.

9. System according to one of the preceding claims, characterized in that a first holding arm and a second holding arm spaced from the first holding arm are movable by the second linear axis, in particular in the vertical direction.

10. System according to one of the preceding claims, characterized in that a support bearing is accommodated in the second, in particular in the lower, holding arm, which rotatably supports the shaft and/or that a bearing is accommodated in the first holding arm, which rotatably supports the shaft.

11. System according to one of the preceding claims, characterized in that a sensor, in particular a structure-borne sound sensor and/or angle sensor, is arranged on the second holding arm and can be moved together with the holding arm, in particular when the linear axes move.

12. System according to one of the preceding claims, characterized in that a mandrel region is formed on the second holding arm, which supports the shaft.

13. System according to one of the preceding claims, characterized in that the holders project radially above the turntable, wherein the area covered by the holders in the axial direction overlaps with the area covered by the turntable in the axial direction and with the area covered by the gear in the axial direction.

14. System according to one of the preceding claims, characterized in that the axial distance between the gear and the pinion is controllable by means of the linear position of the second linear axis.

15. System according to one of the preceding claims, characterized in that the first linear axis is driven by a first synchronous motor and/or that the second linear axis is driven by a second synchronous motor.