CN101907154B - Apparatus for converting rotary motion into linear motion - Google Patents

Abstract

The invention relates to an apparatus for converting rotary motion into linear motion, specifically to a belt transmission device, which has at least one drive shaft 1 driven by a driving device 8 and at least one steering shaft 11, wherein the drive shaft and the steering shaft can be provided with rollers (2, 12), the rollers (2, 12) can guide a traction piece 4, the rotational axis 13 of the steering shaft 11 can be sloped relative to the rotational axis 3 of the drive shaft 1 or be sloped in such a degree by aid of one adjusting device 10, so that the traction piece 4 guided by the rollers (2, 12) can move through sideward without contact at the roller 2 part of the drive shaft 1 and at the roller 12 part of the steering shaft 11, the steering of the traction piece 4 is performed on the driving device 8.

Description

Device for converting rotary motion into linear motion

technical field

The invention relates to a device for converting a rotary motion into a linear motion, in particular a belt drive, which has at least one drive shaft which can be driven by a drive and at least one steering shaft, which can be arranged There are rollers, wherein a traction element can be guided via the rollers, wherein the axis of rotation of the steering shaft is so inclined or tiltable by means of an adjustment device that the axis of rotation of the steering shaft is inclined to such an extent that The traction element can pass by without contact at the rollers of the driving shaft and the rollers of the steering shaft.

Background technique

There are mainly two methods known to date for converting a rotary movement into a linear movement using a traction element (see FIGS. 1 and 2 ). They differ mainly in the arrangement of the traction elements, the number of alternating bends of the traction elements, the minimum number of steering shafts required and the required construction space.

In the so-called O arrangement (see Fig. 1), the movement range of the linear axes is between the drive shaft and the steering shaft.

For example, WO 2006/008515A2 of 18.07.2005 describes a drive for a manipulator arm with a tilted steering axis, where a slide is moved by tilted steering rollers.

In the so-called Ω arrangement (see FIGS. 2 a and 2 b ), the traction element is tensioned via two steering shafts and a drive shaft. The disadvantage of the O setting compared to the Ω setting is the structural length. In the Ω setting, the structural length is only given by the structural length of the linear axis, while in the O setting, the structural length is at least extended by the driving shaft roller and the steering shaft roller. the size of the diameter. Disadvantages of the Ω arrangement compared to the O arrangement are the higher material consumption (two steering axes instead of one), and the so-called reverse rotation of the traction elements in the Ω arrangement (alternating bending), which places higher demands on the material of the traction element and thus requires a large deflection roller diameter.

For example, EP 0 790 098 A1 of April 24, 1996 describes a linear drive with an end-limited traction element and a pulley (Laufkatze) and a traction element Ω arrangement as described above.

Furthermore, DE 197 44 950 A1 of September 30, 1997 also describes a gate drive and belt drive with a driving roller and a driven roller.

Contents of the invention

It is therefore the object of the present invention to devise a device for converting a rotary motion into a linear motion which eliminates the above-mentioned disadvantages with respect to constructional length, material consumption and reverse inversion of the pulling element.

To this end, the invention proposes a device for converting rotary motion into linear motion, having at least one drive shaft that can be driven by a drive, and at least one steering shaft, said driving shaft and steering shaft being provided with rollers, wherein , a traction element is guided via the rollers, wherein the axis of rotation of the steering shaft is so inclined relative to the axis of rotation of the drive shaft that the traction element guided by the rollers can be positioned both at the rollers of the drive shaft and at the steering axis The rollers move past sideways without contact, and it is characterized in that the steering of the traction member is carried out on the drive device.

According to the invention, the above-mentioned object is achieved by the measure that the deflection of the traction means takes place on the drive.

This provides a compact and space-saving arrangement, since the traction element steering is then located on the drive itself and is not a separate unit from the drive.

In addition, reverse inversion of the traction element is avoided, since an oblique position (position) of the axis of rotation of the drive shaft relative to the axis of rotation of the steering shaft would lead to an offset offset of the traction element, so that the traction element (which is fixed, for example, on a linear axis) can be Both at the roller place of the drive shaft and at the roller place of the steering shaft, it is pulled sideways. Since the device can be positioned sideways, the required structural length is derived only from the length of the linear axis, and only one deflection axis is required, and reverse rotation of the traction element is avoided. The mutual oblique position of the axes can be achieved in various ways. A cost-effective embodiment is achieved by a fixed mutual oblique position of the axes. For this purpose, the angle of inclination is determined at the factory by tests and the additional parts are installed in the desired position without adjustment. The oblique position of the axes relative to one another can also be produced by an adjusting device. For example, one possibility consists in mounting the steering shaft (by means of sliding bushes, bearings or the like). As a result, the two axes of rotation are self-aligned with one another, and an angle of inclination of the axes relative to one another is automatically obtained. Likewise, the drive shaft and the steering shaft are guided in an adjustable manner relative to one another (by means of a clamping connection). Here, the ideal inclination angle is obtained by starting the operating stroke several times and repeatedly adjusting it at the same time.

Preferably, it can be provided that both rollers are mounted on the drive.

It has proven to be particularly advantageous if the device has exactly one steering shaft. A cost-effective embodiment can thus be achieved, since material can be saved in this way.

Preferably, it can be provided that the traction element is a form-locking traction element, since this prevents slippage between the mating parts.

In this case, it has been found to be particularly advantageous if the traction element is designed as a delimited traction element, since this is suitable for use of the device on a trolley or as a drive for a linear slide. In this case, the course of such a finite traction element passes from its first fastening point without contact next to the rollers of the drive shaft, via the rollers of the steering shaft and the rollers of the drive shaft, in a contactless manner on the steering shaft Passes alongside the rollers and extends to its second fixed point.

In this case, it has been found to be particularly advantageous if the traction element is designed as a toothed belt and the rollers as corresponding toothed wheels, since precise positioning can thus be achieved. Likewise, the gears can of course also be designed as toothed discs, belt (toothed) rollers or the like.

It can also be provided particularly advantageously here that the device has a tensioning device by which the traction element can be tensioned in order to generate a suitable drive belt tension, for example after a toothed belt has been replaced. The tensioning of the traction element is produced in that at least one clamping element, by which the end of the traction element is fixed to the end of the linear shaft, is arranged adjustably in the elongated hole. Likewise, the distance of the driving roller to the deflection roller can also be configured to be variable, for example by guiding the deflection roller support or the adjusting device in an elongated hole, thus acting as a tensioning device. Likewise, such a tensioning device can also be formed by a tensioning roller, which can be mounted, for example, between the drive roller and the deflection roller and presses against the drive belt so that a suitable drive belt tension is produced. Likewise, tensioning of the traction element can also be achieved by means of the eccentric pins of the deflection rollers.

According to a preferred embodiment, it can be provided that the drive device comprises an electric motor.

As a particularly suitable field of application, it can be provided here that the device is used to move linear axes in operating systems.

Therefore, the present invention also claims such an operating system, which is preferably applied to a manipulator.

In particular, such a device can be used in the operating system of an injection molding machine.

Description of drawings

Further details and advantages of the invention are explained in more detail below with reference to the illustrated exemplary embodiment with the aid of the drawings. in:

Fig. 1 shows the O arrangement mode (prior art) of belt transmission device,

Fig. 2a shows the Ω arrangement of the belt drive (prior art),

Figure 2b shows the arrangement of Ω with a belt drive ("trolley", prior art)

3 to 6 show an exemplary embodiment of the arrangement according to the invention in four schematic diagrams.

Detailed ways

FIG. 1 shows an arrangement O corresponding to the prior art, wherein the linear shaft 7 is moved between the roller 2 of the driving shaft 1 and the roller 12 of the steering shaft 11 by means of the traction element 4 .

FIG. 2 a shows an arrangement of Ω corresponding to the prior art, in which the linear axis 7 is moved by means of the traction element 4 . Here, the traction element 4 is driven by the roller 2 of the drive shaft 1 and guides the linear shaft 7 by means of reverse rotation through the rollers 12 , 12 ′ of the steering shaft 11 , 11 ′.

Figure 2b shows an arrangement of Ω corresponding to the prior art, wherein the linear axis 7 ("trolley") is moved by means of the traction element 4, the roller 2 of the drive shaft 1 and the two rollers of the steering shaft 11, 11' 12, 12' lie on said linear axis.

3 shows a device according to the invention for converting a rotary motion into a linear motion, wherein an end-limited traction element 4 (toothed belt) passes through a roller 12 of the steering shaft 11 and also through the drive shaft 1 One roller 2 is tensioned. Here, the two ends of the traction element 4 are connected to a linear axis 7 (for example a linear slide or a workbench) by means of clamping elements 5 and 6 . In this preferred embodiment, the two ends of the clamping elements 5 and 6 and thus the pulling element 4 lie in one plane. This is advantageous for the service life of the traction element 4 . Of course, it is also possible that the ends of at least one of the clamping elements 5 or 6 and thus also the pulling element 4 do not lie in a plane.

As can be seen in FIGS. 3 to 6 , the steering of the traction element 4 takes place directly on the drive 8 . In this case, the drive shaft 1 and the steering shaft 11 as well as the rollers 2 and 12 arranged thereon are mounted on the drive 8 .

As can be seen from the preferred embodiment, a tilted steering axis 11 is sufficient to achieve the desired deflection of the traction element 4 .

In this case, the steering shaft 11 is tilted by means of the adjusting device 10 to such an extent that the traction element 4 moves past the roller 2 of the drive shaft 1 and the roller 12 of the steering shaft 11 without contact. The drive shaft 1 is driven by a drive 8 . In the preferred embodiment, the drive shaft 1 is arranged vertically, while the steering shaft 11 is inclined relative to it. Likewise, the drive shaft 1 can of course also be additionally or separately tilted.

FIG. 4 shows details of the course of the traction element 4 , as it starts from the left and passes by the roller 2 of the drive shaft 1 without contact, via the roller 12 of the inclined steering shaft 11 to the right to the roller 2 of the drive shaft 1 . The roller 2 passes the roller 12 of the steering shaft 11 without contact and then extends to the right.

FIG. 5 shows a top view of FIG. 4 .

FIG. 6 shows the inclination of the axis of rotation 13 of the steering shaft 11 , whereby the desired offset of the traction element 4 is achieved.

The present invention has been specifically described above by means of the illustrated embodiment, however, it should be understood that the subject matter of the present application is not limited to the embodiment. To be precise, those measures and variants which belong to the transfer of the idea of the present invention are of course fully conceivable and expected.

For example, the traction element can be configured as a chain. Furthermore, for example in applications where less positioning accuracy is required, the traction element can be designed as a force-locking traction element, for example as a flat belt, a wedge-shaped belt or a round belt.

Furthermore, the device can also be used, for example, in situations where the skateboard is in motion and at the same time the traction element is fixed, for example in a tackle.

Table of reference signs

1 drive shaft

2 Roller of drive shaft (1)

3 The axis of rotation of the driving shaft (1)

4 traction parts

5 The first clamping piece, the fixed traction piece

6 The second clamping piece, fixing the traction piece

7 Linear shaft, preferably a linear slide

8 drive device

10 Adjusting device

11, 11' Steering shaft

12, 12' The roller of the steering shaft (11)

13. The axis of rotation of the 13″ steering shaft (11)

Claims (16)

1., for rotary motion being converted to the device of straight line motion, have

-at least one driving shaft (1) that can be driven by a drive unit (8),

-and at least one steering shaft (11),

-described driving shaft and steering shaft are provided with roller (2,12),

-wherein, guide a traction piece (4) by described roller (2,12),

-wherein, the spin axis (13) of steering shaft (11) so tilts relative to the spin axis (3) of driving shaft (1): the traction piece (4) guided by described roller (2,12) also contactlessly can be moved through at the roller of steering shaft (11) (12) place from the side at the roller of driving shaft (1) (2) place

It is characterized in that, turning to of described traction piece (4) is carried out on drive unit (8).

2. device as claimed in claim 1, it is characterized in that, two rollers (2,12) are all placed on drive unit (8).

3. device as claimed in claim 1, is characterized in that, this device has just what a steering shaft (11).

4. device as claimed in claim 1, it is characterized in that, described traction piece (4) is a kind of traction piece of positive.

5. device as claimed in claim 1, it is characterized in that, described traction piece (4) is configured to cingulum.

6. device as claimed in claim 1, it is characterized in that, this device is belt driver.

7. device as claimed in claim 1, it is characterized in that, the spin axis (13) of described steering shaft (11) can by means of the run-off the straight of a controlling device (10) relative to the spin axis (3) of described driving shaft (1).

8. the device according to any one of claim 1 to 7, is characterized in that, described traction piece (4) is configured to the traction piece holding limit.

9. device as claimed in claim 8, it is characterized in that, the extension route of traction piece (4) is from its first immovable point (5), contactlessly pass through on roller (2) side of driving shaft (1), via the roller (12) of steering shaft (11) and the roller (2) of driving shaft (1), contactlessly pass through on roller (12) side of steering shaft (11), extend to its second immovable point (6).

10. the device as described in any one of claim 1 to 7, is characterized in that, described roller (2,12) is configured to gear.

11. devices according to any one of claim 1 to 7, it is characterized in that, this device has at least one tension device (9), can by traction piece (4) tensioning with this tension device.

12. devices according to any one of claim 1 to 7, it is characterized in that, described drive unit (8) has a motor.

13. devices according to any one of claim 1 to 7, is characterized in that, traction piece (4) makes linear axis (7) motion.

14. operation systems, it has the device according to any one of claim 1 to 13.

15. mechanism hands, it has operation system as claimed in claim 14.

16. injection molding machines, it has operation system as claimed in claim 14.