DD209237A5 - DEVICE FOR CONVERTING A ROTATING INTO A LINEAR MOTION - Google Patents

Abstract

While the object of the invention is to inexpensively increase the utility value characteristics of rotary motion conversion to linear motion devices, the object is to develop such a device that does not lock when traveling to the end stop, which is self-locking is and which is designed so that the translation ratio can be made relatively far-reaching in the context of the basic form of the device. According to the invention, the object is achieved in such a way that the first body, advantageously consisting of a screw and a cylinder, on the side having the thread is also provided with teeth running transversely to the threads and in the direction of displacement and extending substantially throughout the body , and the respective roller transversely to the teeth and in the direction of displacement, the teeth corresponding to the teeth of the first Koerpers has teeth which are arranged along the whole roll.

Description

L 4 UU / 4 ό Berlin, 28. 4. 1983

A? i ¹ 16 H / 246 074/3 ~ ^ή 61 795/25/37

Device for converting a rotary into a linear movement

Field of application of the invention

The present invention relates to a device for converting a rotary motion into a linear motion consisting of a first elongated body provided with screw threads extending along the body and a second body rotatable coaxially in relation to the first body and having at least two hubs which are provided with teeth engaging in the screw threads of the first body, thereby shifting the body in relation to each other, one body in relation to the other.

Characteristic of the known technical solutions

Known gate directions of this type apply the screw-nut principle or are formed with ball nut screw »The first device is in their application due to the strong friction and the associated heat development-limited. The latter device, by its construction, causes the linear displacement in relation to the rotational movement to be relatively large, i. h, the possibility of varying the translation is limited.

To circumvent said problems, it is known to apply freely rotatable wheels or rollers which are mounted in one of the relatively displaceable parts and with parallel ribs or threads in the other part

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intervention. Turn ζ. As the threaded part, the wheels engage with the cams, .., with "d en ... thread and thereby displace the said wheeled part, since the squats follow closed circles, i. e., each cam is in its own plane, it is necessary that the axis of the respective wheel is inclined at an angle corresponding to the pitch angle of the thread, or when the axes of the wheels are arranged in parallel with the axis of the threaded portion in that the wheels are axially offset in relation to each other. This means that it is difficult to manufacture, which in itself already meets high demands for tight tolerances, so that the device works perfectly well.

Ss are also Torrichtungen known in which the wheels or rollers have threads that correspond to the threads of the threaded portion. However, the problem remains with these devices, which is also present in the above-described devices that the wheels are accurately guided by the threaded portion and As soon as there is a skewed pitch between the wheels and the threaded part or a wheel goes out of the squeegee, different wheel speeds result and the device inevitably seizes up tightly.

Among other things, increase the forces transferred between the parts and thus to be able to meet the increased wheel bearing forces, it is known dia. To surround wheels or rollers with a nut which is provided along the inside with thread engaging into the wheels, which in order to prevent the wandering of the wheels in the Matter. The same pitch angle as the threads

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of the wheels * In this type of device, it has been possible to synchronize the rotation of the wheels in relation to each other by providing one end of the respective wheel with a ring gear which engages a corresponding ring gear of the nut. Due to the relatively locked training, the wheels must interact with both the threaded part, the screw, and the threaded nut. Since a relative movement between the screw and the wheels can not be prevented, this training has serious disadvantages. Ss is z. B. very difficult to make the device self-locking, d. h., That it comes to a halt even under heavy load without a separate brake. Because of the possible relative movement between the screw and the wheels, it is necessary to disassemble the entire device when driving the device to a stop in an extreme position, to put them back into functional condition «

Object of the invention

The object of the invention is to inexpensively increase the utility properties of rotary to linear motion converting apparatus.

Explanation of the essence of the invention

The object of the invention is to develop a device for converting a rotating into a linear movement that does not lock when driving to the end stop, which is designed to be self-locking and which is designed so that the transmission ratio within the basic form of the device relatively far reaching can be made.

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According to the invention, the object is achieved in such a way that the first body is provided on the threaded side with transverse to the container and in the direction of displacement and along substantially the whole body extending teeth, and the respective roll transversely to the teeth and in the direction of displacement, having teeth corresponding to the teeth of the first body, arranged along the whole roll. Furthermore, according to the invention, the first body is in the form of a screw and the rollers are carried by a bearing housing supported at the ends of the rollers.

It is also according to the invention that the bearing housing has two peripheral, radially inwardly facing and axially separate bearing surfaces, which are provided with parallel.Huten, and that the respective roller is provided at each end with a journal, which correspond to the hats of the respective bearing surface , Combing is formed. Invention According to the invention, too, the cooperating particles and combs have trapezoidal shape. Furthermore, according to the invention, that the teeth of the rollers are formed of threads whose pitch is equal to the threads of the first body of the screw and its rotation opposite to these threads. According to the invention, moreover, that the mutually cooperating threads of the first body and the rollers have trapezoidal shape,

Another feature of the present invention is that the teeth of the first body intersect the thread pitches and the teeth of the respective roll are disposed on the bottom between the teeth and the roller. Also, according to the invention, the teeth are formed as slanted teeth.

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According to the invention, that the squats of the first body and the squats of each Holle are arranged on the Gemndeflanken. It is also according to the invention that the first body has the shape of an internally threaded cylinder and the respective roller is arranged to support at the respective end by means of a journal against an outwardly facing peripheral bearing surface, which is arranged on a plate-shaped carrier, and the respective Achszapfen and the respective bearing surface are provided with intermeshing parallel ridges, and the drivers are connected to an axially displaceable in the cylinder rod.

embodiment

The solution according to the invention will be explained in more detail below in several embodiments with reference to the accompanying drawings.

Ss show:

Pig. 1: a schematic longitudinal section through an embodiment of the device according to the invention;

ig. 2: the threaded screw included in this embodiment and a roller cooperating with the screw;

Pig. "3ί a partial section of screw and roller;

Pig. 4 is a schematic section of a part in this embodiment;

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Pig. 5: a section along Y-Y in Jig. 4 of the part in 51g. 4;

Pig. 6: schematized, another tooth formation between the eye screw and the roller;

Pig. 7: a schematic section through another embodiment sfonn the invention and

Pig. 8: a partial section of a further embodiment of the invention.

The one in Pig. In a bearing housing 3 supports a number of rollers 4 or wheels, which are provided with threads 5 which run opposite to the screw 1 and have the same pitch as the screw threads. The screw 1 .-- is driven by an electric motor 6 which is fixedly mounted in a cylinder 7. The bearing housing 3 is connected to a rod 8, which can accommodate the screw 1 in itself and is slidably mounted in bearings 9 at the end of the cylinder 7. Die.Stange 8 is supported by means of the periphery of the bearing housing 3 slidably carried in the cylinder. At the free ends of the cylinder 7 and the rod 8 Befestigungsösen .10 are arranged. Upon activation of the electric motor 6 and thereby rotation of the screw 1, the rollers 4 roll on the screw 1, whereby, as a result of the engagement of the threads, the bearing housing 3 and the rod 8 are displaced in relation to the cylinder 7.

To prevent relative movement between the threads of the screw and the threads of the rollers and thereby when driving

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To prevent the device against an end stop clamping the bearing housing 3 with the rollers, the screw 1 along its entire length at the thread crests arranged teeth 11. See in particular the Pig. 2 and 3 · The relevant roller 4 is between the containers 5, d. H. the threaded floors, provided with corresponding teeth 12. In the pig. 2 and 3, the screw 1 and a roller 4 are shown separated from each other, but in the assembled state, the rollers and the screw with their threads and teeth are intended to

/ ~ - \ Intervene * This assembled state is schematically from the Pig. 4 and 5, there is shown a screw 1 with five rollers 4 (only one shown) in it. As is apparent from FIGS. 2 and 4, the roller in question 4 a journal 13s & ^er ^ i "and a number of parallel trapezoidal ridges 14 is provided on each 3nde The bearing housing 3 is. At each end with an inwardly directed flange or thickening 15, which has an inwardly facing bearing surface 16, along the inner periphery of which are arranged parallel combs 17 corresponding to the ridges 14. As can be clearly seen in Fig. 4, in the assembled state the roller in question engages with its threaded and toothed teeth Peripherals into the

Wind ".windwind and toothed outside of the screw 1 and abuts against it, and with its journal 13 rests against the bearing surface 16 of the bearing housing 3, with the combs 14 in the hats 17. Qa the five rollers in a common plane with the aid of combs 14 and hats 17 are axially locked on the bearing housing 3, each roller 4 is pointed to a clearly defined position "along the periphery of the screw 1, in the present Pail with a Pün tin division of each other. A division maintaining roller bearing holder is not required.

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There, as in the Pig · 2 and. 4, the threads 2 and 5 ° of the screw and the rollers 4 trapezoidal shape has been given, and since the stub axles 13 are provided with the trapezoidal ridges 14 which engage in the corresponding hats 17, it is possible during operation of the "To minimize device acting radial forces and instead isolate the axial forces, whereby large bending moments can be avoided in the bearing housing 3. By arranging a number of combs 14 on the journal 13, a relatively large, the axial forces receiving bearing surface is obtained the relatively large Aniiegeflache, which is obtained between the threads of the screw 1 and the rollers 4 due to the trapezoidal shape, a total of such static friction can be achieved that the device is self-locking.

The arrangement of journal pins 13 freely rolling along the bearing surface 16 of the bearing housing 3 allows, to some extent, a suitable variation in the gear ratio of the device by changing the diameter of the axle journal 13 (as well as the bearing surface 16) while retaining the remaining variables. The formula for the total transfer U ₊ can be derived as follows:

^ü t ^{= S} ^ ⁿ R ⁺ % ^ ~ ^S »

^d 2

ⁿ p = ⁿ RD ^>

in the S = the slope (right- or left-hand thread)

the screw 1 and roller 4, d ₂ = diameter of the journal 13 »D ₀ = diameter of the bearing surface 16,

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η = distance of movement of the axle journal 13 in relation to the diameter of the bearing surface 16,

n _R - number of revolutions of roller 4 per screw rotation.

In Pig. Fig. 6 shows how the teeth of the screw 1 and roller 4, instead of in the thread crest or on the threaded base, are arranged on the thread flanks, ie, in the pig. β are the squats 11 'of the screw 1 and the curls 12 ^{f of} the roller are shown ·

Pig, Fig. 7 shows a gate direction according to the invention in which the screw is replaced by an internally threaded cylinder 19 driven by an induction motor whose rotor 20 is fixedly connected to the cylinder 19 and whose stator with windings 21 is fixed to a sleeve which also rotatably supports the cylinder 19 in the bearing 23. The cylinder 19 is partially surrounded by the cylinder 22. Sine in relation to the cylinder 19 slidable rod 24 carries at one end the rotatably mounted rollers 4 between a pair of plate-like holder or driver 25 "In Pig .. 7, the rollers are mounted on mounted on the drivers axes 2β. Such as Of course, as shown in FIG. 4, the rollers 4 may instead comprise stub axles 13, in which case the drivers have the shape of circular discs having peripheral bearing surfaces fixed to the rod 24 which are provided with hats, see Pig. 8, are provided in the same manner as the aforementioned storage areas with the hats 17 *

By using trapezoidal threads on screw (cylinder) and rollers as well as between journal and bearing surfaces, it is

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As mentioned, it is possible to eliminate the radial forces, while at the same time the radial tolerance in the production is not critical. It is to be emphasized that trapezoidal threads are not a necessity according to the invention, but also other types, for. B * pointed thread, can be applied. The teeth of the screw (the cylinder) and the rollers may preferably be obliquely cut, which contributes to a quieter running and to a force grant in the axial direction.

The Hollen 4 can, as follows. Fig. 4, be mounted on axles, wherein the bonding surfaces of the rollers and / or axles absorb the axial forces. If one is willing to accept the inconvenience of different roles in one and the same device, it is within the scope of the invention also possible to provide the rollers instead of threads 5 with parallel ridges, which in the thread 2 of the Sehraube (of the cylinder ) intervene. The bottoms between the combs are provided with teeth, as in the device described above. In such a door direction, however, the combs on one roll must be offset in relation to the combs on the other roll, i. h * when using five rolls on one screw, with a threaded entry, the ridges of a succeeding roll must be offset one-fifth of the thread pitch in relation to a previous roll.

Claims (5)

ο / c η 7 / O ^{61 795/25} 2460/4 3 - ιι - BrfindungsansOruch A device for converting a rotating to a linear motion, comprising a first elongated body provided with screw threads extending along the body, and a second body rotatable coaxially in relation to the first body and having at least two rollers provided with are provided in the screw threads of the first body engaging teeth, whereby when v 'rotation of the body in relation to each other'der one body is moved in relation to the other, characterized in that the first body, advantageously consisting of a screw (1) and a cylinder (19) on which the thread (2) side is also provided with transverse to the threads and in the direction of displacement and along substantially the whole body erstrekkenden teeth (11), and the respective roller (4) transverse to their teeth and in the direction of displacement extending teeth corresponding to the teeth of the first body (12) disposed along the entire roller (4). f ·   ' ^v "2. Torrichtung according to item 1, characterized in that the first body is in the form of a screw (1) and the rollers (4) are carried by a at the ends of Hollen is supported bearing housing (3). 3 * Device according to point 2, characterized in that the bearing housing (3) has two peripheral, radially inwardly facing and axially separate bearing surfaces (16) which are provided with parallel! Tuten (17), and that the respective roller (4 ) at each end with an axle pivot (13) 24607.4. 3 61 795/25 - 12 - is provided, which is formed with the hats (17) of the respective bearing surface (16) corresponding to combs (14). 4. Device according to item 3, characterized in that the cooperating hats (17) and combs (14) have trapezoidal shape. Device according to one of the items 1 to 4, characterized in that the teeth of the rollers (4) are formed from threads (5) whose pitch is equal to that of the threads (2) of the first body, the screw (1), and whose rotation is opposite to these threads. 6. The device according to item 5, characterized in that - the cooperating threads (2, 5) of the first body and the Hollen (4) have trapezoidal shape. 7. Device according to one of the preceding points, characterized in that the teeth (11) of the first body cut through the Gewindespitζen and the teeth (12) of the respective roller (4) are arranged at the bottom between the teeth of the roller. 8. Device according to one of the preceding points, characterized in that the teeth are formed as diagonally cut teeth * 9. Device according to one of the items 2 to 6, characterized in that the squats (11 ¹ ) of the first body and the ITocken (12 ') of the respective roller (4) are arranged on the thread flanks, 246074 3 10 · Torrichtung nach. Item 1, characterized in that the first body has the shape of an internally threaded cylinder (19) and the respective roller is arranged to support at the respective end by means of a pivot pin against an outwardly facing peripheral bearing surface on a plate-shaped carrier ( 2?) Is arranged, and the respective journal and the respective bearing surface are provided with intermeshing parallel ridges, and the drivers are connected to an axially displaceable in the cylinder (19) rod (24). For this 3 pages drawings