Device for transformation of rotary motion into progressive (versions)

FIELD: machine building.

SUBSTANCE: device for transformation of motion consists of screw, casing with covers and thread rolls. Thread rolls with ends installed in casing with ability of rotation around its axis and allows cylindrical threaded surfaces engaged to screw. At ends of each thread roll there are implemented spherical projections centres of which are located on axis of roller. At each cover there are implemented spherical angular clearances centres of which are also located on axis of corresponding roller. Additionally radius of spherical angular clearances in covers for 2-3% more than radius of spherical projections implemented on corresponding to it ends of each threaded roll. Device is outfitted by two pins which are provided for angular attitude of covers relative to casing.

EFFECT: increasing of output capability and durability of device, decreasing of its overall dimensions.

3 cl, 5 dwg

 

The invention relates to mechanical engineering and can be used as a mechanical screw transmission for converting rotary motion into reciprocating.

Known planetary roller screws passing, see Reshetov D.N. "Machine parts", a textbook for students of engineering and mechanical specialties, 4th edition, Moscow, Mashinostroenie, 1989, str consisting of screws, nuts and installed between the threaded rollers. The rollers its mechanical tails installed in the separators. To prevent spontaneous loosening of the rollers, they are additionally connected at the ends with nut toothed gearings. The coils of the rollers are threaded links with the turns of the screw and nut. When this jet perform multiple outer thread, and the nut - internal multiple threads.

The main disadvantage of this planetary roller screws transmission is the technological complexity of manufacturing on the inner surface of the nut, hardened to a higher hardness, high-precision multiple-thread (usually five or satisfide). Mainly for this reason, the development of production of planetary roller screws gears which most operational parameters exceed other transmission to convert rotational motion of postupatel is Noah, difficult. In the world production of planetary roller screws gears mastered only a few firms.

When the threaded nut is considered the planetary roller screws transmission performs the following functions:

receives the axial force from the actuator and transmits it through the rollers of the screw:

- keeps the rollers from moving in the radial direction from the axis of the screw to the nut;

- participates in the conversion of rotary motion into reciprocating.

Known technical solutions closest to the technical nature of the claimed device is a device for converting rotary motion into reciprocating, see RF patent №2310785 "a Device for converting rotary motion into reciprocating", F16H 25/00-25/24, F16H 1/34, IB No. 32, 2007, which is selected as a prototype.

This device consists of a screw housing mounted thereto caps, threaded rollers, each of which is mounted in the housing can be rotated around its own axis, two or more rings mounted in separators of balls, the number of which is twice the number of threaded rollers and seals. When the device is, typically, the screw rotates, and the housing with the screw rollers performs translational motion. Working axial force on the device is transmitted with wines is and on the rollers due to the screw mates turns these parts, and then threaded rollers on one of the covers through the balls installed in the separator. For this purpose, the ends of each threaded roller is made of a spherical undercut, and on the inner end surfaces of the caps - ring grooves. Each ball is simultaneously set in the undercut threaded roller and the annular radial groove of the cover. When the sphere radius must be smaller than the radius of the undercut in the screw rollers and the annular groove in the cover and in this condition the ratio of these three radii can be arbitrary.

To balance the radial force acting from the side of the screw in the screw roller, the latter directly on the cylindrical threaded surface are annular grooves in which are mounted rings. To stabilize the movement of the threaded rollers, the constancy of the transfer function of the device and eliminate misalignment of the threaded rollers, the latter are connected with the casing two toothed gearings, and balls mounted in each cover, installed in the separator.

This device has the following main disadvantages.

1. The device has a low load capacity due to the low contact strength in place of the pair of the ball with an annular radial groove in the lid. It is known that the contact strength of components such with whom praganiaj depends on the ratio of principal curvatures of the parts at the point of initial contact. One of the main curvature of the specified slot is equal to the radius of its profile, and the second is equal to zero. Hence the contact area in place of the pair of the ball with the specified groove is small, and the contact stresses are high.

2. All the balls installed in the annular radial groove of the cover, also installed in the spherical undercut the various threaded rollers and, in addition, in the separator. So the ball is imposed many relationships. All these parts are made with errors. Threaded rollers, even associated toothed gearings with the body, can keep up or outrun each other when the device is. Threaded rollers warp in the plane formed by the axes of the screw and roller at different angles under the action of axial load acting on the roller. It should be noted that the total axial force transmitted from the device, unevenly distributed between the rollers. Hence the axis of the holes in the separator under the balls does not coincide with the axis of the ball, which is determined by the contact force with cap and clip. The result is a decrease in efficiency because of the additional slide in the pair of balls and cage and reducing the load capacity and durability of the device.

The objective of the invention is to increase the load capacity and durability of the device for converting rotary motion into reciprocating accounts for the increase of the contact strength in place of the pair of threaded roller or bowl with cover, and by excluding from the device separators. In addition, the proposed device is structurally simple and has smaller dimensions.

For the 1-St variant of the device, this object is achieved in that it is provided with two pins, which are designed for the angular orientation of the lid relative to the housing, the ends of each threaded roller made of spherical protrusions, the centers of which are located on the axis of the threaded roller, and each cap is made of a spherical undercut, the centers of which are also located on the axis of the respective screw clip, with the radius of the spherical pagnutti in caps 2-3% more than the radius of the spherical projections made at the ends of each threaded roller. Perhaps the performance of this device, which is equipped with two rings, which are mounted in annular grooves made on the cylindrical threaded surface of each roller, and these slots perform as close as possible to the opposite ends of the threaded rollers, cylindrical threaded surface of each roller or one of its annular grooves made hex key, and the width of the annular grooves on the threaded rollers greater than the width of the rings is not less than 1.5 to 2 thread pitch of the screw.

For the 2nd variant of the device on the threaded ends of the rollers are made with eticheskie undercut, the centers of which are located on the axis of the threaded roller, and has the balls installed in the specified podotreme threaded rollers. This object is achieved in that the device is provided with two pins, which are designed for the angular orientation of the lid relative to the body, each cover is made of a spherical undercut, the centers of which are located on the axis of the respective screw clip, with the radius of the spherical pagnutti made on the ends of threaded rollers equal to the radius of the spherical pagnutti made in the lids, the radius of the balls 2-3% less than the radius of the spherical pagnutti made in the lids, and each ball is additionally installed in the spherical undercut the cover.

The invention is illustrated the accompanying drawings, where:

- figure 1 shows a General view of the device;

- figure 2 shows a section a - a in figure 1 for the basic version of the 1-St variant of the device;

- figure 3 shows a section a - a in figure 1 for additional performances of the 1-St variant of the device;

- figure 4 shows the location B in figure 2 for the 1-St variant of the device with a higher load capacity;

- figure 5 shows the position B in figure 2 for the 2nd variant of the device for which the transmission load of the threaded rollers on the cover is made through balls.

A device for converting reshitelnogo motion into reciprocating (option 1), see figure 1, consists of a screw 1 and node performing translational movement with the basic elements of "B" (Zapf under the bearings, which are intended for connection of the specified node with the Executive mechanism. The specified node, see figure 2, consists of a body 2 and the two covers 3, which is connected to the housing with 4 screws with lock washers 5 and the two pins 6. At least one between the lid 3 and the housing 2 is installed a set of shims or the compensator 7. There are other possible execution of the specified node, which provides Assembly and operation of the device.

To the outer end surface of each cover 3, see figure 2, attached l-shaped sleeve 8, which holds with axial and radial clearance slinger 9.

Inside the enclosure, see figure 2, set screw rollers 10, which usually from the neighborhood choose the greatest for increasing the load capacity of the device (the minimum number of threaded rollers is three). Threads of the rollers 10 engage with the turns of the thread of the screw 1. At the ends of each threaded roller 10, see figure 2, perform spherical protrusions G with radius Rp, the center of which is located on the axis of the threaded roller. On the inner end surface of each cover perform spherical undercut D with radius RKthe centre which is also located the Yong on the axis of the threaded roller, and the number of solution for back-facing one cap is equal to the number of rollers. To the axis of all of the rollers are parallel to the axis of the screw, the desired angular orientation of the lid relative to the body, which is carried out by means of two pins 6.

A feature of the Assembly of this device, see figure 2, is the selection of the thickness of the set of shims or compensator 7. This thickness should be such that the contact of the spherical projections "G" of each clip with a spherical odnotrahniki "D" in the opposite caps was without axial clearance at points "E" and "W"located on the nominal axis of the roller.

If the device screw is rotated, resulting in rotation around its own axis, all the rollers and the housing with the roller performs translational motion. With the side screws on each roller are axial and radial forces that must be balanced in the points "E" and "W", see figure 2, the initial contact of the spherical projections "G" roller and spherical pagnutti "D" in the opposite covers. So that under the action of radial forces to the point "E" and "W" have not been moved from the nominal position of the roller axis, it is necessary that RKwas 2-3% higher than RPsee figure 2, but no more. Otherwise, the device may stall.

The 1st variant of the device may have additional enforcement is. For him, see figure 3, on the threaded cylindrical surfaces of the rollers 10 are two groove "And". The device is equipped with two rings 11, which are made of spring steel and have high radial rigidity. Each ring 11 is installed in a corresponding groove "And". The ring size 11 should be such that they created a small preload on the screw pair of rollers 10 with the screw 1, in which the device is not jammed.

When assembling this device, see figure 3, due to the specified tightness you need the key to consistently voracity rollers 10 with rings 11 on the screw. For this purpose, each threaded cylindrical surface of each roller or one of its grooves And perform hex "K" key, and the width of the LPgroove And greater than the width of the LKring 11 1.5...2 thread pitch of the screw (the screw roller) to ensure the Assembly of the device. Then the axial position of all of the rollers are aligned with one of the covers 3, install the housing 2, connecting it with a pin and screws with this cover, and is fixed on the second housing cover, by adjusting the axial clearance of the housing with the lid relative to the roller.

When the device is on each roller operates additional overturning moment from axial forces from the screw and one of the covers. To ring 11, see figure 3, can more effectively play the take this tipping point, the grooves And rollers should be performed as close as possible to the opposite ends of the threaded rollers. That is, the distance between the slots "And" (ring 11) should be the maximum possible. The strength on rings from overturning moment will be the smallest and the roller in the plane formed by its axis and the axis of the screw, will have the smallest skew angle that will provide a more uniform load distribution between the turns of the threaded rollers along their axes, and consequently, will increase the load capacity and durability of the inventive device.

Perhaps a second version of the 1-St variant of the device with a higher load capacity by increasing the main curvature of the mating surfaces, resulting in an increased area of contact of these surfaces under load. For this purpose, see figure 4, increasing the radius of the spherical pagnutti in caps RKand the radius of the spherical protrusions on the ends of threaded rollers RPleaving the ratio unchanged.

To improve efficiency of the device, which slightly reduces the load capacity, possible 2nd variant of the inventive device. For this purpose, see figure 5, at the opposite ends of the threaded rollers perform spherical undercut "L" and set them in the balls 12, which also set the in spherical undercut "D", made in the lid 3. The radii of the spherical pagnutti "L" and "D" are equal, and the radius of the ball RW2-3% less than the radius of these pagnutti. The largest sphere radius RW,MAXthat you can apply for this option, the device must be less than half the diameter of the depressions of the thread roller. The value of RWsignificantly affect the load capacity of the device.

The device prototype load with threaded clip on the cap is passed balls. As noted above, the greatest radius of the ball RW,MAXhas a limit on size. The device prototype balls installed in the separator, causing the value of RW,MAXwill be even less. This value is further limited, as at the ends of the rollers should be placed in the key hole. Therefore, the greatest value of the sphere radius ToW,MAXfor device-prototype will be less than in the inventive device with the balls. The value of RW,MAXsignificantly affect the load capacity, as with the increase of RW,MAXsurface tension is less.

However, a more significant reduction of contact stresses and increasing the load capacity depends on the shape and dimensions of the contacting surfaces in the lid of the device. In the device-prototype this surface is circular with radius profile, one main Cree is the Eastern of which is equal to zero. Hence, the contact area of the ball and the annular groove is small. In the inventive device, this surface is spherical, the two main curvature which is the same and reach the maximum possible value. Hence, the contact area of the spherical undercut in the housing cover and a spherical protrusion of the threaded roller or ball (option 2) is significantly greater than in the device prototype.

In addition, the proposed device has a simpler construction than the device prototype.

The inventive device without having toothed crowns and separators for separating the balls, can have smaller dimensions.

1. A device for converting rotary motion into reciprocating containing a screw, a casing attached thereto caps, threaded rollers mounted in the housing can be rotated around its axis and having a cylindrical threaded surface included in threaded engagement with the screw, and the end faces, characterized in that the device is provided with two pins, which are designed for the angular orientation of the lid relative to the housing, the ends of each roller are spherical protrusions, the centers of which are located on the axis of the threaded roller, and each cap is made of a spherical undercut, the centers of which are also located on the axis of the respective screw clip, with the radius sherice is such pagnutti in caps 2-3% more than the radius of the spherical protrusions, performed at the ends of each threaded roller.

2. The device according to claim 1, characterized in that it has two rings, which are mounted in annular grooves made on the cylindrical threaded surface of each roller, and these slots perform as close as possible to the opposite ends of the threaded rollers, cylindrical threaded surface of each roller or one of its annular grooves made hex key, and the width of the annular grooves on the threaded rollers greater than the width of the rings is not less than 1.5 to 2 thread pitch of the screw.

3. A device for converting rotary motion into reciprocating containing a screw, a casing attached thereto caps, threaded rollers mounted in the housing can be rotated around its axis and having a cylindrical threaded surface included in threaded engagement with the screw, the ends of which are spherical undercut, the centers of which are located on the axis of the threaded roller, and balls mounted in said podotreme threaded rollers, characterized in that the device is provided with two pins, which are designed for the angular orientation of the lid relative to the body, each cover is made of a spherical undercut, the centers of which are located on the axis corresponding threaded roller, and for the with spherical pagnutti, performed on the threaded ends of the rollers is equal to the radius of the spherical pagnutti made in the lids, the radius of the balls 2-3% less than the radius of the spherical pagnutti made in the lids, and each ball is additionally installed in the spherical undercut the cover.



 

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