EP4392202A1

EP4392202A1 - Clamping arrangement for the clamping-on of a workpiece, in particular a transmission housing

Info

Publication number: EP4392202A1
Application number: EP22750996.5A
Authority: EP
Inventors: Zili Wu
Original assignee: SEW Eurodrive GmbH and Co KG
Current assignee: SEW Eurodrive GmbH and Co KG
Priority date: 2021-08-26
Filing date: 2022-07-18
Publication date: 2024-07-03
Also published as: DE102022002625A1; WO2023025408A1

Abstract

A clamping device for the clamping-on of a workpiece, in particular a transmission housing, wherein a multi-part tie rod is received in a multi-part clamping block, wherein the tie rod has at least a rod lower part, an intermediate rod part and a rod upper part, wherein the clamping block has at least a base part, an intermediate part and an upper part, wherein the intermediate rod part has a first toothing which is in engagement with a toothing of the rod lower part, and a second toothing which is in engagement with a toothing of the rod upper part, wherein the rod lower part is connected to the base part.

Description

DTRQ7H D^T

WO 2023/025408 PCT/EP2022/025336

- 1 -

Clamp arrangement for clamping a workpiece, in particular a gear housing

Description:

5 The invention relates to a clamping arrangement for clamping a workpiece, in particular a transmission housing.

It is generally known that an object can be clamped to a tabletop with a clamping device.

The invention is therefore based on the object of further developing a clamping arrangement, in which case the clamping for workpieces of different sizes should be made possible with little effort.

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

Important features of the clamping arrangement for clamping a workpiece, in particular gear housing,

20, in particular where the clamping arrangement has at least one clamping device, are that a multi-piece pull rod is accommodated in a multi-piece clamping block, in particular the respective clamping device, in particular

25 is received with a precise fit, the pull rod having at least one lower rod part, one intermediate rod part and one upper rod part,

30 wherein the terminal block has at least a base part, an intermediate part and an upper part,

ISI \ EIDOPAT 07/18/2022

Received at EPO via web form on Jul 18, 2022 DTRQ7H D^T WO 2023/025408 PCT/EP2022/025336

- 2 - wherein the intermediate rod part has a first toothing, which engages with a toothing of the rod lower part, and a second toothing, which engages with a toothing of the rod upper part, in particular wherein the screw head fits into a threaded bore of the rod upper part

5 screwed-in first screw is supported on the upper part, the lower part of the rod being connected to the base part or at least being set against a step of the base part, in particular to limit the lower part of the rod in the direction of the tensile force caused by the screw when it is screwed into the upper part of the rod.

The advantage here is that due to the modular structure, the clamping device can be modified easily and quickly. Thus, a shorter or longer intermediate part can be used or the number of intermediate parts can be changed, since an interface is created between the base part and the intermediate part and also between the intermediate part and the upper part

15 interface is created. Correspondingly, both an interface between the lower rod part and the intermediate rod part and an interface between the upper rod part and the intermediate rod part are created.

The multi-piece pull rod formed in this way is due to the precisely fitting recording

20 in the terminal block can be subjected to a high force in the direction of the tensile force, since the pieces of the tie rod rest against one another in the direction of the tensile force and cannot deviate in the transverse direction, i.e. transversely to the direction of the tensile force.

Thus, the tie rod holds the terminal block together. At the top of the terminal block,

25, which is arranged on its underside on a base plate on which the workpiece is placed, a clamping bracket can be fastened, which then presses onto the workpiece from a second screw.

The workpiece clamped according to the invention is processed after clamping,

30 machined in particular in a machine tool, and is preferably a gear housing.

In an advantageous embodiment, the intermediate part is arranged between the base part and the upper part,

- 3 - wherein the intermediate rod part is arranged between the rod bottom part and the rod top part. The advantage here is that a modular design of the pull rod has a high

Allows 5 variance with a small number of parts. This means that workpieces of different sizes can be clamped on with little effort.

In an advantageous embodiment, a centering bolt is accommodated in the base part, which projects into the intermediate part, in particular, and which centers the intermediate part, another centering bolt is accommodated in the intermediate part, which projects into the upper part, in particular, and which centers the upper part, in particular the respective centering bolt by means of a respective set screw

15 is secured. The advantage here is that the base part is centered on the intermediate part and this is then centered on the upper part. The terminal block can therefore be manufactured with a high level of manufacturing accuracy. Because when connecting the parts, they are centered on each other using the centering bolts.

In an advantageous embodiment, the base part is connected to the intermediate part. The advantage here is that on the one hand the pull rod effects the connection by means of the tensile force and on the other hand it secures the connection itself in a form-fitting manner.

In an advantageous embodiment, one or the intermediate part is connected to the upper part

25 connected. The advantage here is that on the one hand the pull rod effects the connection by means of the tensile force and on the other hand it secures the connection itself in a form-fitting manner.

In an advantageous embodiment, the screw head of a further screw which protrudes through a slot in a clamping bracket and is connected to the upper part delimits

30 limits the clamping bracket, especially in the direction of the tensile force. The advantage here is that the sides of the terminal block and the pull rod facing away from the clamping bracket are connected to one another.

Received at EPO via web form on Jul 18, 2022 DTRQ7H D^T

WO 2023/025408 PCT/EP2022/025336

- 4 -

In an advantageous embodiment, a third screw screwed into the upper part supports the clamping bracket, in particular on the side of the clamping bracket facing the upper part. The advantage here is that an even clamping can be carried out in a secured manner.

- 5 -

In an advantageous embodiment, the centering bolts, in particular the first and the second, are arranged in a recess running through the terminal block,

5 in particular, the recess being closed off from the environment by means of a plug. The advantage here is that the recess is spaced from the pull rod. The centering function can thus be carried out at a distance from the pull rod.

In an advantageous embodiment, the pull rod, in particular the tensile force generated by the first screw, presses the upper part against the intermediate part, so that the intermediate part presses against the base part. The advantage here is that the pull rod stabilizes and holds the clamping block together.

In an advantageous embodiment with the teeth of the lower rod part in the

15 engaged first toothing of the intermediate rod part designed such that the tensile force generated by the first screw is positively passed through from the lower part of the rod to the intermediate rod part. The advantage here is that the adjacent tooth flanks extend transversely to the direction of tensile force. Thus, the tensile force is passed through. Shearing forces generated as a result of the precisely fitting accommodation of the pull rod in the

20 derived from the clamping block and secured the geometric shape of the drawbar.

In an advantageous embodiment, the second toothing of the intermediate rod part, which meshes with the toothing of the rod upper part, is designed in such a way that the tensile force generated by the first screw is positively transmitted from the intermediate rod part to the

25 rod top is passed through. The advantage here is that the adjacent tooth flanks extend transversely to the direction of tensile force. Thus, the tensile force is passed through. Shearing forces generated as a result are dissipated by the precisely fitting accommodation of the drawbar in the clamping block and the geometric shape of the drawbar is secured.

30 In an advantageous embodiment, the abutting tooth flanks of the meshing toothings are at an angle to the plane whose normal direction is aligned parallel to the direction of the tensile force and/or to the direction of the rod,

Received at EPO via web form on Jul 18, 2022 DTRQ7H D^T

WO 2023/025408 PCT/EP2022/025336

- 6 - wherein the absolute value of the angle is less than 10°, in particular has the value 0°, in particular at least for the right flank of a respective tooth of the respective

5 toothing or alternatively at least for the left flank of a respective tooth of the respective toothing. The advantage here is that the adjacent tooth flanks extend transversely to the direction of tensile force. Thus, the tensile force is passed through. Shearing forces generated as a result are dissipated by the precisely fitting accommodation of the drawbar in the clamping block and the geometric shape of the drawbar is secured.

In an advantageous embodiment, the respective toothing is designed as an involute toothing. The advantage here is that the toothing is easy to produce.

In an advantageous embodiment, the center point of the pitch circle is the toothing

15 is spaced from the tie rod and from the central axis of the tie rod, ie in particular from the straight line connecting the centers of gravity of the lower part of the rod and the upper part of the rod. The advantage here is that the adjacent tooth flanks extend transversely to the direction of tensile force. Thus, the tensile force is passed through. Shearing forces generated as a result are dissipated by precisely fitting the drawbar in the clamping block

20 and secured the geometric shape of the pull rod.

In an advantageous embodiment, the terminal block has a second intermediate part, which is arranged between the upper part and the base part.

25 wherein the pull rod has a second intermediate rod part which is arranged between the upper rod part and the lower rod part, in particular wherein the first intermediate part is structurally identical to the second intermediate part and/or wherein the first intermediate rod part is structurally identical to the second intermediate rod part. From

The advantage here is that the clamping device can be adapted to a workpiece of a different size with as little effort as possible.

Received at EPO via web form on Jul 18, 2022 DTRQ7S D^T WO 2023/025408 PCT/EP2022/025336

- 7 -

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 claims

5 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.

10

- 8th -

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

FIG. 1 shows a clamping arrangement for holding a workpiece in a non-positive manner in an oblique view.

5

FIG. 2 shows a sectional view of the clamping arrangement.

FIG. 3 shows a pull rod in a side view.

FIG. 4 shows a section of the pull rod on an enlarged scale.

FIG. 5 shows an oblique view of the pull rod.

In Figure 6, a first workpiece 60 with the clamping arrangement is shown on a base plate 1

15 attached.

In FIG. 7, a first workpiece 70 is fastened to a base plate 1 with one of the same parts of the clamping arrangement.

A sectional view associated with FIG. 7 is shown in FIG.

In the figure 9, the intermediate rod part 21 is shown in an oblique view.

FIG. 10 shows the top rod part 22 in an oblique view.

25

As shown in FIGS. 1 and 2 together with FIGS. 3 to 7, the clamping arrangement has a base part 2 which is fastened on a base plate 1 .

On the base part 2, an intermediate part 3 is placed, on which an upper part 4 is placed on

30 to which a clamping screw 7 is fastened, which protrudes through a longitudinal slot of a clamping bracket 8, in particular a clamping bar, and delimits it, in particular in the clamping direction.

- 9 -

A screw 5 applies tensile force to a pull rod that is designed in several pieces according to the invention. The tie rod protrudes from the base part 2 through the intermediate part 3 to the upper part 4 .

5 On the upper part 4 there is also a screw 6 acting as a support for the clamping bracket 8, in particular a support screw. In particular, the screw 6 is screwed into the upper part 4 .

A workpiece placed on the base plate 1 can thus be clamped by means of the clamping bracket 8 and can then be machined by a tool, in particular a machine tool.

Due to the modular structure, workpieces of different sizes can be clamped and

15 editable.

As shown in FIG. 2, a lower rod part 20 is accommodated and fixed in the base part 2 . The lower rod part 20 has teeth on its upper side, that is to say on its first end region.

20

An intermediate rod part 21 has teeth on each of its two end areas, that is to say in particular on its lower and upper end area.

The first of the two teeth of the intermediate part 21 is engaged with the

25 Serration of the lower part of the rod 20.

During production, after the teeth have been brought into engagement, the intermediate part 3 is placed on the base part 2 , with a centering pin 24 accommodated in the base part 2 centering the intermediate part 3 with respect to the base part 2 . In particular, the centering pin 24 protrudes from this

30 out of the base part 2 and after placing the intermediate part 3 into the intermediate part 3 .

- 10 -

The intermediate rod part 21 protrudes from the intermediate part 3 with the toothing arranged on its end region remote from the base part 2 .

5 Thus, in the next step, an upper rod part 22, which also has an end area provided with a toothing, is connected by the toothing of the upper rod part 22 being brought into engagement with the second of the two toothings of the intermediate rod part 21 and then an upper part 4 on the intermediate part 3 placed, with a recorded in the intermediate part 3 centering the upper part 4 to the intermediate part 3 centered.

In particular, the centering bolt protrudes from the intermediate part 3 and, after the upper part 4 has been put on, into the upper part 4 .

15 The rod upper part 22 has a threaded hole, in particular whose drilling axis is aligned parallel to the direction of the rod.

A screw 5 is screwed into this threaded hole in the rod upper part 22 , the screw head of which rests against the upper part 4 . The screw 5 protrudes through the upper part 4 and

20 thus pulls the upper rod part 22 towards the upper part 4 when screwed on, so that a tensile force is generated in the rod made of several pieces, which is formed from the lower rod part 20 , the intermediate rod part 21 and the upper rod part 22 .

The centering bolts 24 and 25 are radially connected by a respective one, through the base part 2

25 or through the intermediate part 3 protruding, in particular securing threaded pin fixed.

The centering bolts 24 and 25 are received in a recess which protrudes through the base part 2, through the intermediate part 3 and through the upper part 4.

30

The recess in the upper part is closed off from the environment by means of a plug 23 .

- 11 -

The toothings of the respective end regions are designed in such a way that the toothings which are in engagement with one another pass through the tensile force generated by the screw 5, in particular when the screw 5 is screwed in, in a form-fitting manner.

5

In order to prevent a radial deflection of the parts connected via the meshing teeth, i.e. the lower rod part 20 with the intermediate rod part 21 or the intermediate rod part 21 with the upper rod part 22, the lower rod part 20 after it has been connected to the intermediate rod part 21 and the intermediate part 3 has been placed on the base part 2 was received with a precise fit in the intermediate part 3 and the intermediate rod part 21 was received with a precise fit in the intermediate part 3 on the one hand and in the upper part together with the rod upper part 22 with a precise fit on the other hand.

The teeth of the toothing are preferably formed according to an involute toothing, with the center point of the pitch circle of the respective toothing outside of the

15 pull rod is positioned, in particular spaced from the central axis of the pull rod, which is formed from the lower rod part 20, the intermediate rod part 21 and the upper rod part 22.

So it is important that when generating the tensile force through the screw 5, each with each other

20 engaged toothings cannot be pulled apart because they cannot dodge transversely, in particular perpendicularly, to the direction of the tensile force, in particular as a result of the above-mentioned precisely fitting recordings.

The screw 6 is screwed into a threaded hole in the upper part 4, so that on

25 screw head of this screw 6, a support for the clamp 8 can be formed.

The clamping bracket 8 is delimited by the screw 5 in that the screw 5 protrudes through the slot of the clamping bracket 8 and the screw head of the screw 5 is arranged on the side facing away from the upper part 4 and as a result the clamping bracket 8 in

30 direction of traction limited.

- 12 -

As shown in FIG. 3 and FIG. By means of the screwed into the rod upper part 22 and on the upper part 4

5 supported screw, the tensile force is generated. This is because the screw head of the screw rests against the upper part 4 on the side of the upper part 4 facing away from the rod upper part 22 . The screw protrudes through the upper part hidden in FIG. 3 and FIG. 5 and is screwed into a threaded hole in the upper part 22 of the rod.

FIG. 4 clearly shows that the tooth flanks of the toothings that are in contact with one another are at an angle to that plane whose normal direction is aligned parallel to the direction of the tensile force. The amount of the angle is preferably less than 10° and may preferably disappear, ie reach zero, in particular at least for the right flank of a tooth or alternatively for the left flank

15 of the tooth.

As shown in FIG. 6, the clamping device formed in this way is used for clamping on a gear housing 60, the gear housing 60 being arranged between the clamping bracket 8 and the base plate 1. In total there are four, to the one described above

20 clamping device identical clamping devices used.

As shown in Figure 7 together with Figure 8, the clamping device is achieved by inserting an additional intermediate part 3 between the intermediate part 3 and the base part 2, and by additionally inserting a further intermediate rod part 21 between the lower rod part

25 20 and the intermediate rod part 21 can be extended. Accordingly, an additional centering bolt must also be provided in the additionally inserted intermediate rod part 21 .

Thus, a larger workpiece 70, in particular gear housing, with the

30 clamping devices can be attached to the base plate 1.

- 13 -

In further exemplary embodiments according to the invention, the further intermediate rod part 21 has a different length, with the intermediate part 3 likewise having a correspondingly different length. In this way, to the respective gear housing

5 a respective clamping device applicable.

In further exemplary embodiments according to the invention, the workpiece is attached to the base plate 1 by a plurality of clamping devices. However, the clamping devices are not the same, but different from each other.

10

In further exemplary embodiments according to the invention, a different toothing, in particular a splined toothing, is used instead of the involute toothing.

15

- 14 -

Reference List

1 base plate

5 2 base part

3 intermediate part

4 top

5 screw

6 screw, especially bearing screw

10 7 clamp screw

8 clamping brackets, in particular clamping bars

20 bar base

21 intermediate rod part

22 bar top

23 plugs

24 centering bolts

25 centering bolts

60 workpiece, in particular gear housing

70 workpiece, in particular gear housing

20

Received at EPO via web form on Jul 18, 2022

Claims

DTRQ7H D^T WO 2023/025408 PCT/EP2022/025336 - 15 - Patent claims: 5

1. Clamping arrangement for clamping a workpiece, in particular a gear housing, in particular wherein the clamping arrangement has at least one clamping device, characterized in that a multi-piece pull rod is accommodated in a multi-piece clamping block, in particular the respective clamping device, in particular is accommodated with a precise fit,

15 wherein the pull rod has at least a lower rod part, an intermediate rod part and a upper rod part, wherein the clamping block has at least a base part, an intermediate part and an upper part,

20 wherein the intermediate rod part has a first toothing, which is engaged with a toothing of the rod lower part, and a second toothing, which with a

toothing of the upper part of the rod is engaged,

25 wherein the lower rod part is connected to the base part or is at least placed against a step of the base part, in particular to limit the lower rod part in the direction of the tensile force caused by the screw when screwing into the upper rod part.

- 16 -

2. Clamping device according to claim 1, characterized in that the intermediate part is arranged between the base part and the upper part,

5 wherein the intermediate bar portion is located between the bar bottom and the bar top.

3. Clamping device according to one of the preceding claims, characterized in that a centering bolt is accommodated in the base part, which protrudes into the intermediate part, in particular and which centers the intermediate part, another centering bolt is accommodated in the intermediate part, which in the upper part

15 protrudes, in particular and which centers the upper part, in particular with the respective centering bolt being secured by means of a respective threaded pin.

20 4. Clamping device according to one of the preceding claims, characterized in that the base part is connected to the intermediate part and / or that

25 one or the intermediate part is connected to the upper part.

5. Clamping device according to one of the preceding claims, characterized in that

30 the screw head of a further screw (7) which protrudes through a slot of a clamping bracket and which is connected to the upper part limits the clamping bracket, in particular in the direction of the tensile force.

- 17 -

6. Clamping device according to one of the preceding claims, characterized in that a third screw screwed into the upper part supports the clamping bracket, in particular

5 on the side of the clamp bracket facing the upper part.

7. Clamping device according to one of the preceding claims, characterized in that the, in particular the first and the second centering pin in a through the terminal block

10 continuous recess are arranged, in particular wherein the recess is closed by means of a plug to the environment.

8. Clamping device according to one of the preceding claims, characterized in that the pull rod, in particular the tensile force generated by the first screw, presses the upper part against the intermediate part, so that the intermediate part presses against the base part.

20 9. Clamping device according to one of the preceding claims, characterized in that the screw head of a screwed into a threaded bore of the rod upper part first screw (5) is supported on the upper part.

- 18 -

10. Clamping device according to one of the preceding claims, characterized in that the standing with the toothing of the lower rod part in engagement with the first toothing

5 intermediate rod part is designed in such a way that the tensile force generated by the first screw is passed through in a form-fitting manner from the lower rod part to the intermediate rod part, and/or that

10 the second toothing of the intermediate rod part, which meshes with the toothing of the upper rod part, is designed in such a way that the tensile force generated by the first screw is passed through in a form-fitting manner from the intermediate rod part to the upper rod part.

- 19 -

11. Clamping device according to one of the preceding claims, characterized in that the abutting tooth flanks of the respectively engaged with each other

5 toothings have an angle to that plane whose normal direction is aligned parallel to the direction of the tensile force and/or to the direction of the rod, the absolute value of the angle being less than 10°, in particular having the value 0°, in particular at least for the right flank of a respective Tooth of the respective toothing or alternatively at least for the left flank of a respective tooth of the respective toothing.

12. Clamping device according to one of the preceding claims, characterized in that

15 the respective toothing is designed as an involute toothing.

13. Clamping device according to one of the preceding claims, characterized in that the center point of the pitch circle of the teeth is spaced from the pull rod and from

20 of the central axis of the drawbar, in particular of the straight line connecting the centers of gravity of the lower part of the rod and the upper part of the rod.

14. Clamping device according to one of the preceding claims, characterized in that

25 the clamping block has a second intermediate part arranged between the upper part and the base part, wherein the pull rod has a second intermediate rod part arranged between the upper rod part and the lower rod part,

30 in particular wherein the first intermediate part is structurally identical to the second intermediate part and/or wherein the first intermediate rod part is structurally identical to the second intermediate rod part.

Received at EPO via web form on Jul 18, 2022 DTRQ7H D^T

WO 2023/025408 PCT/EP2022/025336

- 20 -

15. Clamping device according to one of the preceding claims, characterized in that between the clamping bracket (8) and a base plate (1) connected to the base part (2)

5 a workpiece is clamped, in particular by tightening a clamping screw (7) protruding through the clamping bracket.

Received at EPO via web form on Jul 18, 2022