EP4341196A1

EP4341196A1 - Drive arrangement comprising a shaft, a rope drum, a retaining means and a gear motor

Info

Publication number: EP4341196A1
Application number: EP22725164.2A
Authority: EP
Inventors: Gao QIONGHUA
Original assignee: SEW Eurodrive GmbH and Co KG
Current assignee: SEW Eurodrive GmbH and Co KG
Priority date: 2021-05-17
Filing date: 2022-04-21
Publication date: 2024-03-27
Also published as: WO2022242899A1; DE102022001370A1

Abstract

The invention relates to a drive arrangement comprising a shaft, a rope drum, a retaining means and a gear motor, in which: the gear motor has a gear driven by an electric motor of the gear motor, the output shaft of said gear being designed as a hollow shaft; bearings for rotatable mounting of the output shaft are accommodated in a housing part of the gear; the shaft is mounted rotatably by means of bearings accommodated in the retaining means; the rope drum is connected to the shaft for conjoint rotation; a torque support is connected to the retaining means; at least one screw passing though an opening in the torque support is screwed - into a threaded bore of the housing part of the gear or - into a threaded bore of a part resting against the housing part of the gear; the screw with its screw head presses a first damping ring onto the torque support and thus the torque support presses a second damping ring towards the housing part of the gear.

Description

Drive arrangement with a shaft, a cable drum, a holding device and a geared motor

Description:

The invention relates to a drive arrangement with a shaft, a cable drum, a holding device and a geared motor.

It is generally known that a drive arrangement is designed with a shaft, a cable drum, a holding device and a geared motor.

A cable drive is known from US Pat. No. 5,167,401 A as the closest prior art.

A cable winch is known from DE 103 21 760 B4.

A rope detection device is known from US 2006/0 163546 A1.

A cable drum is known from US 2016/0 236918 A1.

From CN 1 03803435 A a cable winch is known.

DE 43 35791 A1 discloses a device for lifting a load that extends over a greater horizontal length.

DE 199 03 227 C2 discloses a cable pull with overload protection.

A direct drive with a bearingless motor is known from US 2016/0 031 686 A1.

The invention is therefore based on the object of further developing a drive arrangement with a shaft, a cable drum, a holding means and a geared motor with an increased service life. According to the invention, the object is achieved in the drive arrangement with a shaft, a cable drum, a holding means and a geared motor according to the features specified in claim 1.

Important features of the invention in the drive arrangement with a shaft, a cable drum, a holding means and a geared motor are that the geared motor has a gear driven by an electric motor of the geared motor, the output shaft of which, in particular the output shaft, is designed as a hollow shaft, wherein in a Housing part of the gearbox bearings are accommodated for the rotatable mounting of the output shaft, the shaft being rotatably mounted by means of bearings accommodated in the holding means, in particular relative to the holding means, the cable drum being non-rotatably connected to the shaft, with two on the cable drum, in particular one from the other in the axial direction spaced-apart ropes are at least partially wound up, with a first roller mount being attached to the holding means, on which two rollers are accommodated and rotatably mounted, the rollers being spaced apart and aligned coaxially with one another, the axis of rotation of the rollers being parallel to the axis of rotation of the cable drum, with the minimum distance between the cable drum and the respective pulley being less than twice the cable diameter, in particular the diameter of the cable, and/or greater than the cable diameter, in particular to prevent the cable drum from being wrapped in multiple layers equal to the rope diameter. The advantage here is that the ropes are wound up in a controlled manner, which reduces wear and tear on the ropes and the risk of tears. This increases the service life. In addition, the drive arrangement according to the invention can be made compact and robust.

In an advantageous embodiment, the area covered by the cable drum in the axial direction includes the area covered by the two rollers in the axial direction. The advantage here is that both rollers cover the winding area of the two ropes on the rope drum. In particular, each turn of rope along the entire winding area can be touched by one of the two rollers. In this way, a cable winding can be prevented from moving out radially.

In an advantageous embodiment, the first of the rollers touches a first rope above the point at which the first rope begins to touch the rope drum, with the first roller having a circumferential angle distance of between 10° and 50° from this point and in relation to the axis of rotation of the rope drum /or to the horizontal plane, in particular with the first cable running essentially vertically from the cable drum, in particular from the point, to a first basket part, in particular with the end area of the first cable being attached to the first basket part, and/or the second of the roller touches a second rope above that point at which the second rope begins to touch the rope drum, with reference to the axis of rotation of the rope drum, the second roller 33 having a circumferential angular distance value of between 10° and 50° from this point and/or from the horizontal plane, in particular wherein the second cable from the cable drum, in particular from the point until runs essentially vertically to a second cage part, in particular with the end region of the second cable being attached to the second cage part. The advantage here is that a multi-layer uncontrolled and/or disorderly winding up of the rope can be prevented. This also reduces the wear on the ropes. The basket parts of a grab basket can be actuated with the two ropes, so that the grab basket formed from the two basket parts can be opened or closed. The two ropes are wound up synchronously, so that the two basket parts can also be actuated synchronously and the grab basket therefore closes or opens as symmetrically as possible. For this purpose, it is advantageous to wind up or unwind the two ropes on the same rope drum.

In an advantageous embodiment, a second roller holder is attached to the holding means, on which a third roller is received and rotatably mounted, the third roller being spaced apart from the other two rollers in the circumferential direction. wherein the axis of rotation of the third pulley is aligned parallel to the axis of rotation of the cable drum, wherein the minimum distance between the cable drum and the third pulley is less than twice the cable diameter, in particular the diameter of the cable, in particular to prevent multiple layers of winding on the cable drum, and /or is greater than the cable diameter or equal to the cable diameter, in particular the area covered by the cable drum in the axial direction encompassing the area covered by the third pulley in the axial direction. The advantage here is that the security against losing the rope or against uncontrolled disorderly winding up of the rope is reduced.

In an advantageous embodiment, a torque arm, in particular a torque arm part, is connected to the holding means, in particular by means of screws, with at least one screw passing through a recess in the torque arm being screwed into a threaded hole in the housing part of the transmission or is screwed into a threaded bore of a part resting on the housing part of the transmission, in particular in the direction of the axis of rotation of the shaft which is positively connected to the housing part, wherein the screw with its screw head presses a first damping ring onto the torque arm and the torque arm thus presses a second damping ring to the housing part of the transmission.

The advantage here is that shock loads, which are passed on to the holding means via the rods, can be dampened towards the geared motor. The drive arrangement is therefore of robust design. In addition, the cable drum is directly connected to the output shaft of the gearbox via the shaft. An adapter or a coupling is not provided. Therefore a compact solution is achieved.

In an advantageous embodiment, the gear is designed as a parallel shaft gear and the rotor shaft of the electric motor is aligned parallel to the shaft. The advantage here is that a cost-effective production is made possible.

In an advantageous embodiment, the inside diameter of the recess is larger than the maximum outside diameter of that area of the screw that covers the same area in the axial direction as the recess also covers in the axial direction. The advantage here is that the screw is spaced from the torque arm.

In an advantageous embodiment, the damping rings are made from a material that is softer and/or has higher elasticity and/or easier deformability than the material from which the torque support is made and/or from which the housing part is made. The advantage here is that high damping can be achieved.

In an advantageous embodiment, the damping rings are made of plastic and/or rubber. The advantage here is that damping of shock loads can be achieved. In an advantageous embodiment, the torque arm is designed as an L-shaped bent steel part, with a first leg of the L extending parallel to the axis of rotation of the shaft and the other leg extending perpendicular to the axis of rotation of the shaft. The advantage here is that a simple production of a robust component is made possible.

In an advantageous embodiment, each damping ring is designed in several pieces. The advantage here is that improved damping can be achieved.

In an advantageous embodiment, each damping ring is designed as a stack of rings, each of which is made of a different material. The advantage here is that improved damping of shock waves can be achieved and the geared motor is therefore arranged in a protected manner.

In an advantageous embodiment, the shaft is partially inserted into the hollow shaft and connected in a torque-proof manner, in particular by means of a feather key connection. The advantage here is that a compact yet robust design is made possible in a simple manner.

In an advantageous embodiment, ropes can be wound up on the rope drum, with a respective rope being connected to a respective basket part of a grab basket. The advantage here is that a simple, robust drive solution for the grab basket can be achieved.

In an advantageous embodiment, the basket parts are arranged so as to be rotatable about a common axis of rotation, with each basket part being connected via a respective pivot bearing to a rod which is connected to the holding means, in particular is connected with play. The advantage here is that simple, cost-effective production is made possible.

In an advantageous embodiment, a roller mount for rotatably supporting and holding a damping roller is attached to the holding means, the electric motor, in particular with its housing, against the roll holder. The advantage here is that effective damping can be achieved since the motor, in particular its housing, only fits loosely and it is therefore difficult for shock waves to propagate to the motor. Further advantages result from the dependent claims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, there are further meaningful combinations 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 posed by comparison with the prior art.

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

FIG. 1 shows a schematic sketch of a grab basket drive, in particular a shovel drive.

FIG. 2 shows a drive area of the drive according to the invention, having a geared motor, in an oblique view.

FIG. 3 shows the drive area without a geared motor.

As shown in the figures, the grab basket has two basket parts, in particular blades, which can be moved relative to one another. the two basket parts are arranged to be rotatable about a common axis of rotation. The axis of rotation is indicated schematically in FIG. 1 in a first position 1 and in a second position 2 . Depending on the rotational position of the basket parts around the axis of rotation, the position of the axis of rotation is shifted, since each basket part is connected via a swivel joint to a rod 5, which is connected to a holding means 23 of a cable winch drive 3 with only slight play.

A shaft 31 is rotatably mounted on the holding means 23, onto which a cable drum of the cable winch drive 3, which can be driven by a geared motor (20, 21) of the cable winch drive 3, is attached and connected in a rotationally fixed manner. The cable drum is driven by an output shaft, designed as a hollow shaft 22, of a gear 21 of the geared motor. The hollow shaft 22 is slipped onto the axially protruding shaft 31 and connected in a torque-proof manner.

The gear 21 is driven by an electric motor 20 .

Two ropes 4 can be wound up on the rope drum, each of the ropes 4 being connected to a respective basket part 6 so that the respective basket part can be pivoted by winding or unwinding the ropes 4 on the rope drum. A torque support 24 is connected to the holding means 23, through which the reaction torque of the geared motor can be derived. To connect the torque support 24, screws 25 are screwed into threaded bores in the housing part of the transmission or in a sheet metal part lying against the housing part of the transmission.

The screws 25 protrude through the torque support 24, damping rings 32 being attached on both sides of the torque support, through which the screws 25 also protrude.

Thus, the screw head of the respective screw 25 is in contact with a first of the damping rings 32, which is in contact with the torque support 24, which is pressed towards the housing part of the transmission via a respective second damping ring 32. The screws 25 protrude through a recess in the torque support, the recess having a larger inside diameter than the outside diameter of the screw 25 . Preferably, therefore, there is sufficient play between the respective screw 25 and the torque support 24 so that the geared motor is only slightly loaded in the event of sudden loads on the cage parts 6 .

Although shock loads acting on the cables 4 are transmitted to the hollow shaft 22 via the cable drum and the shaft 31, shock loads which are applied via the rods 5 are only transmitted via the holding means 23 and the torque support 24 and the intermediate damping rings 32 to transfer gearbox.

The damping rings 32 are made of a softer material than the torque support 24, which is preferably made of steel, and the housing part of the transmission, which is preferably made of steel. A plastic and/or rubber is suitable as the material for the damping rings 32 .

The electric motor 20, in particular the housing of the electric motor 20, is preferably in contact with a roller mount 35, so that the geared motor is protected from impacts.

The torque support 24 is designed as an L-shaped bent steel part, with a first leg of the L extending parallel to the axis of rotation of the shaft and the other leg extending perpendicularly to the axis of rotation of the shaft. The roller holder 35 is fastened to the holding means 23 and rotatably supports two rollers 33 which are coaxially aligned with one another. The two rollers 33 are spaced apart axially. The axes of rotation of the rollers 33 are aligned parallel to the axis of rotation of the cable drum 30 . The minimum distance between the cable drum 30 and the respective roller 33 is equal to the diameter of the cable 4. Thus, the respective cable 4 can be wound onto the cable drum 30 in only one layer. When winding or unwinding the respective cable 4, the roller 33 guides the respective cable 4. The roller 33 thus acts as a captive device.

The rollers 33 touch the respective rope 4 above that point at which the rope 4 begins to touch the rope drum 30 . In relation to the axis of rotation of the cable drum 30, the roller 33 has a circumferential angular distance of between 10° and 50° from this point and/or from the horizontal plane. The cable 4 runs from the cable drum 30, in particular from the point, to the respective basket part 6 essentially vertically.

The area covered by the cable drum 30 in the axial direction includes the area covered by the two rollers 33 in the axial direction.

A third roller 34 is also rotatably mounted on a further bracket connected to the holding means 23 , the axis of rotation of this third roller 34 also being aligned parallel to the axis of rotation of the cable drum 30 .

The area covered by the cable drum in the axial direction also includes the area covered by the third roller 34 in the axial direction. The minimum distance between the cable drum 30 and the third pulley 34 is also equal to the diameter of the cable 4. Thus, a further protection for the cable 4 is achieved. This is because the third roller 34 also only releases a single-layer winding of the cable drum 30 with the cable 4, thus in particular preventing a two-layer or multi-layer winding.

The area covered by the third roller 34 in the axial direction includes the area covered by the first and second roller 33 in the axial direction. Thus, only a single third roller 34 to secure the winding of both ropes 4 is necessary. In relation to the axis of rotation of the cable drum 30, the third roller 34 has an angular distance from the first roller 33 counter to the circumferential direction of between 70° and 90°. The third roller 34 is thus arranged below, ie below in the gravitational direction, the first roller 33 . The roller holder 35 has an axis which is firmly connected to the holding means 23 and on which the hollow-cylindrical rollers 33 are rotatably mounted by means of a roller bearing, in particular a needle bearing, or by means of plain bearings. The axis is connected centrally to the hardening means 23, so that the two rollers 33 can be arranged symmetrically to this central connection point.

On the other hand, the further roller holder for the third roller 34 is designed in two parts, so that both ends of the third roller 34 are each mounted via a roller bearing, in particular needle bearings, or by means of plain bearings, and each of the two parts of the roller holder is firmly connected to the holding means 23.

In further exemplary embodiments according to the invention, it is not the cable diameter that is selected as the respective minimum distance, but a larger value which is smaller than twice the cable diameter. Thus there is some play for the rope, but a two-layer or multi-layer winding is still prevented.

In further exemplary embodiments according to the invention, each damping ring is made in several pieces. In this case, therefore, each damping ring can be implemented as a stack of rings, each of which is made of a different material. A further improved damping can thus be achieved.

Reference List

1 first position 2 second position

3 winch drive

4 rope

5 rod

6 basket part, in particular blade 20 electric motor

21 gears

22 hollow shaft, in particular output shaft

23 holding means

24 Torque arm 25 bolts

30 rope drum

31 wave

32 damping ring

33 first or second roll 34 third roll

35 reel mount

Claims

Patent Claims:

1. Drive arrangement with a shaft, a cable drum, a holding device and a geared motor, the geared motor having a gear driven by an electric motor of the geared motor, the output shaft of which, in particular the output shaft, is designed as a hollow shaft, with bearings being accommodated in a housing part of the gear for the rotatable mounting of the output shaft, characterized in that the shaft is rotatably mounted by means of bearings accommodated in the holding means, in particular relative to the holding means, the cable drum being non-rotatably connected to the shaft, with two cables on the cable drum, in particular spaced apart from one another in the axial direction, at least partially wound up, a first roller holder being attached to the holding means, on which two rollers are received and rotatably mounted, the rollers being spaced apart and coaxially aligned with one another, the axis of rotation of the rollers being parallel to the axis of rotation of the cable drum is aligned whereby, in particular to prevent multi-layer winding of the cable drum, the minimum distance between the cable drum and the respective pulley is less than twice the cable diameter, in particular the diameter of the cable, and/or is greater than the cable diameter or is equal to the cable diameter.

2. Drive arrangement according to claim 1, characterized in that the area covered by the cable drum in the axial direction comprises the area covered by the two rollers in the axial direction.

3. Drive arrangement according to one of the preceding claims, characterized in that the first of the rollers touches a first rope above that point at which the first rope begins to touch the rope drum, the first roller 33 having a circumferential angle distance value relative to the axis of rotation of the rope drum between 10° and 50° to this point and/or to the horizontal plane, in particular with the first cable running essentially vertically from the cable drum, in particular from the point, to a first cage part, in particular with the first cable having its end region on the first cage part and/or that the second of the rollers touches a second rope above the point at which the second rope begins to contact the rope drum, with the second roller 33 having a circumferential angle distance value of between 10° and 50° relative to the axis of rotation of the rope drum ° has to this point and / or to the horizontal plane, in particular the zwe The rope runs essentially vertically from the rope drum, in particular from the point, to a second basket part, in particular the end region of the second rope being fastened to the second basket part.

4. Drive arrangement according to one of the preceding claims, characterized in that a second roller holder is attached to the holding means, on which a third roller (34) is received and rotatably mounted, the third roller being spaced apart from the other two rollers (33) in the circumferential direction is. wherein the axis of rotation of the third pulley is aligned parallel to the axis of rotation of the cable drum, wherein the minimum distance between the cable drum and the third pulley is less than twice the cable diameter, in particular the diameter of the cable, in particular to prevent multiple layers of winding on the cable drum, and /or is greater than the cable diameter or equal to the cable diameter, in particular the area covered by the cable drum in the axial direction encompassing the area covered by the third pulley in the axial direction.

5. Drive arrangement according to one of the preceding claims, characterized in that a torque support, in particular a torque support part, is connected to the holding means, in particular by means of screws, with at least one screw passing through a recess in the torque support being inserted into a threaded hole in the housing part of the transmission or is screwed into a threaded bore of a part resting on the housing part of the transmission, in particular in the direction of the axis of rotation of the shaft which is positively connected to the housing part, wherein the screw with its screw head presses a first damping ring onto the torque arm and the torque arm thus presses a second damping ring to the housing part of the transmission.

6. Drive arrangement according to one of the preceding claims, characterized in that the gear is designed as a parallel shaft gear and the rotor shaft of the electric motor is aligned parallel to the shaft.

7. Drive arrangement according to one of the preceding claims, characterized in that the clear inner diameter of the recess in the torque support (24) is larger than the maximum outer diameter of that area of the screw which covers the same area in the axial direction as the recess in the axial direction covered.

8. Drive arrangement according to one of the preceding claims, characterized in that the damping rings are made of a material which has a higher elasticity than the material from which the torque arm is made and / or from which the housing part is made.

9. Drive arrangement according to one of the preceding claims, characterized in that the damping rings are made of plastic and / or rubber.

10. Drive arrangement according to one of the preceding claims, characterized in that the torque support is designed as an L-shaped bent steel part, with a first leg of the L extending parallel to the axis of rotation of the shaft and the other leg extending perpendicular to the axis of rotation of the shaft.

11. Drive arrangement according to one of the preceding claims, characterized in that each damping ring is designed in several pieces.

12. Drive arrangement according to one of the preceding claims, characterized in that each damping ring is designed as a stack of rings, which are each made of different material, and/or that the shaft is partially inserted into the hollow shaft and is connected in a rotationally fixed manner, in particular by means of a feather key connection .

13. Drive arrangement according to one of the preceding claims, characterized in that ropes can be wound up on the rope drum, with a respective rope being connected to a respective basket part of a grab basket, and/or in that the basket parts are arranged so as to be rotatable about a common axis of rotation, with each Basket part is connected via a respective pivot bearing to a rod which is connected to the holding means, in particular is connected with play.

14. Drive arrangement according to one of the preceding claims, characterized in that a roller mount for rotatably mounting and holding a roller is attached to the holding means, the minimum distance between the roller and the rope drum being equal to the diameter of the rope, in particular the rope wound up on the rope drum , especially in such a way that the rope can only be wound up in one layer on the rope drum.

15. Drive arrangement according to one of the preceding claims, characterized in that the electric motor, in particular with its housing, rests against the roller mount.