Ball cylindrical transmission

 

The invention relates to mechanical engineering, to the mechanisms of conversion speed, and can be used in various technical fields where it is necessary to change the speed of the rotating parts or magnitude of the transmitted torque. Ball cylindrical transmission contains three consistently covering each other bands, one of which is made oblique groove (one period), on the other multiperiod. Intermediate ferrule with a through longitudinal slots is a separator. In cylindrical ball transfer both raceways cut on a spherical surface. The technical result is to increase the uniformity of the accelerations experienced by the balls when moving along the tracks. In one modification of the invention is achieved by an additional technical result consists in the elimination of overturning moment. 2 C.p. f-crystals, 6 ill.

The invention relates to mechanical engineering, to the mechanisms of conversion speed, and can be used in various technical fields where it is necessary to change the speed of the rotating parts or magnitude of the transmitted torque.

Known planetary gears, of, performed on facing to each other surfaces of the Central wheels (SU 1019148, 1988, SU 1216498, 1986). Rolling elements are placed in the slots in the carrier. Any of the three parts of this transmission can serve as input, output or painted with a stationary element. In the future, a number of authors began to call such transfer sinusoscopy (SU1350417, 1987), and drove with slots - separator. Similar developments performs the firm “Synkinesis, USA, but its patents raceways are called Cams (US 5312306, 1994). In the above sources described two modifications of ball gear. In the disk details with raceways are disks, and periodic raceway performed on flat surfaces for periodic curves, in particular sinusoids with scale radius around forming a circle. In the cylindrical gear of the Central wheels are covering each other parts of cylindrical shape, and the raceway is made on the lateral cylindrical surfaces of these components in the form of a cylindrical sinusoids (Ignatiev P. M. Sinusoscopy gearboxes. Minsk, “Vysheishaya school”, 1983, page 5-7). Type curves, which made the raceway, a significant merkezine balls in its reciprocating movements have fairly large jumps in acceleration when passing through the vertices of the sinusoids. In the future, for a more smooth linear movement of the balls in the US patent (US 6039672, 2000) it was proposed to use in the raceways for the formation of main transmission segments and transition segments in the field of highs and lows polar radii of the various associated piecewise continuous functions. This decision effectively for disk transmission, where no particular problem in the manufacture of tracks of any complexity on a flat surface of the disk. For cylindrical gears in which one of the tracks located on the inner cylindrical surface, to implement this decision difficult. At the same time, the cylindrical transmission have certain advantages over disk, the main of which is to balance the transmission axis regardless of the number of balls and any number of periods of the raceways.

The simplest transfer cylindrical type, we choose the prototype (see patent US 5312306, 1994). It consists of three sequentially covering each other clip. The average housing located between the other two, made with prodolny slots for the balls and is a separator. On the lateral cylindrical surface of one of the clips made multiperiod dstanley a cylindrical wave with the number of periods equal to one. Identical transmission described in the book Ignatiev P. M. Sinusoscopy gearboxes. Minsk, “Vysheishaya school”, 1983, PP 8-12. In these mechanisms oblique groove made on covered parts, and the paper trail - the outer covering of the cage. This choice of the location of the tracks on the inner and outer parts is advantageous from the point of view of the silo-torque transfer characteristics. However, the manufacture of multi-period raceways on the inner cylindrical surface represents a significant technological problem, whose solution requires the use of special equipment and considerably increases the cost of the transfer. Daily track - slanting groove in cross section has the shape of an ellipse, and the chain of balls will be an ellipse with an uneven arrangement of the balls around the perimeter. That is, during operation, the balls are experiencing uneven acceleration relative to one of the tracks, causing beats and noise. In addition, a cylindrical gear with one of the tracks in the form of oblique grooves have the effect of overturning moment, which increases the load on the Cabinet part.

The objective of the invention is to provide a simple and inexpensive ballpoint transmission to the result, achieved by the invention is to improve the uniformity of the accelerations experienced by the balls when moving along the tracks. In one modification of the present invention, additional technical result consists in the elimination of overturning moment.

To solve this problem, a cylindrical ball gear, as the prototype contains three consistently covering each other clip. On facing to each other of the cylindrical surfaces of the two outer clips made periodic raceway sine wave and a slanting groove. The average clip is made with a through longitudinal grooves in which are placed the balls that are in simultaneous contact with both raceways in the extreme clips.

Unlike the prototype forming surface for both raceways is a sphere with its center lying on the axis of the cylindrical casing.

That is, the surfaces running tracks remain cylindrical form, changing only the shape of the imaginary surface, which includes forming curves for raceways. When you singleperiod track in the form of an oblique groove in cross section is transformed from Ellas is simplifying technology raceways slash groove should be carried out on the inner cylindrical surface of the outer ring.

To eliminate the overturning moment in the described cylindrical transfer it is advisable to perform a double row. For this purpose, the outer and inner hoops transmission performed by the second pair of paired raceways. Between the tracks of the second pair entered the second chain of balls, which are located in the second row of slots in the separator.

The invention is illustrated in graphic materials, where Fig.1 and 2 schematically depicts a longitudinal section of the proposed transmission with an oblique groove made on the outer and inner casings, respectively. In Fig.3A and 3b shows a longitudinal section of a two-row transfer with the elimination of overturning moment. In Fig.4 shows a view of the oblique groove 4 by the arrow F and, for comparison, the corresponding view on a slanting groove in the device, taken as a prototype. It should be noted that the possible layout and planting of the clamps is not limited to these drawings.

Ball cylindrical transmission is a three consistently covering each other clips 1, 2, and 3. In all the drawings the numeral 1 indicates the housing with an oblique groove 4, number 3 made with multiperiod groove 5, and figure 2 - intermediate holder - separator through a in Fig.2 is characterized by greater ease of manufacture of the raceway, where oblique groove 1 was performed on the inner cylindrical surface, and multiperiod groove 5 on the outer surface of the covered cage. In the drawings, the balls 7 are depicted in the two extreme positions. Forming surface tracks 4 and 5 is the General scope And with center at the point O which is the center of symmetry of the system clips. The radius of the sphere R is the distance from the middle of the separator 2 to the axis of DD1. The bottom of the track 4 is located respectively on the field, and the bottom track 5 on the sphere S. the radii of the spheres a, b and C differ from each other by an amount equal to the radius of the ball 7. The angle of the oblique groove 4 to the plane of the cross-section transmission denote. The magnitude of this angle may not be any. On the figures by the dashed line 8 shows the boundary position of the ball, at which the center of the ball 7 is outside of the separator 2, and the ball stops to pass the time. It is obvious that the boundary position of the ball depends on the radius R, thickness of the separator 2 and the diameter of the ball 7. Angle1, the corresponding boundary position 8 ball 7 and is the maximum angle of inclination of the oblique grooves 4. So, the angle1 depends on the radii of the clamps 1 and 3, the thickness of the separator is as a gearbox input shaft must be the holder 1 with an oblique groove, and output shaft and a body part can be the separator 2 or ferrule 3 with multiperiod raceway.

Double-row transfer in Fig.3A and 3b differs from the above only by the fact that each of the clips made additional raceways. To the holder with an oblique groove 4 is made additional groove 9 having the same largest angle and the groove 4, with the same (Fig.3a) or the opposite (Fig.3b) direction. In case of high requirements to transfer better to do the opposite inclination of the oblique grooves. In the case of providing a lower cost of manufacturing preferred the same inclination of the oblique grooves. The holder 3 is made more multiperiod track 10, and the separator-additional longitudinal slots 11, which posted more balls 12. Tracks 9 and 10 as well as tracks 4 and 5 are made on the spherical surface. The opposite inclination of the oblique grooves 4 and 11 creates a fully balanced system of moments. The same slope of the grooves removes the overturning moment due to the rigidity of the system. Outer ring 3 in this transfer serves as the output shaft, and to connect it with the shaft of the actuator is provided by the slots 13. The separator 2 is one the scrap and is connected with a drive device by means of pins 15.

The transmission will consider using Fig.1, for example, its use as a reducer for concreteness, let's agree that a fixed (Cabinet) the yoke is the yoke 3. During the rotation of the input shaft casing 1 under the action of the oblique grooves 4 balls as the satellites will be used to enhance the periodic raceway 3, simultaneously performing the reciprocating axial movement along the slots 6 of the separator 2. Since the groove 4 cut on the spherical surface, the trajectory of the ball it is a circle of radius R with a uniform arrangement of the balls in a circle (see Fig.4A). Fig 4b shows the corresponding trajectory of the balls along the paths through the device, taken as a prototype. It is obvious that in the prototype balls, moving in an ellipse, will experience significant fluctuations distances relative to each other. Or, in other words, in the proposed transfer each ball will make only angular displacement relative to the center of symmetry About and all balls chain will precessional regarding this point. In the prototype the ball in addition to angular movements experiencing deviations in the radius of the point O, which causes undesirable noise and beats.

Work double-row transfer Ohm overturning moment one row offset the tipping point of another transmission range when the opposite slopes of the grooves and is eliminated due to the distance between the points of application of the tipping points in the same direction of inclination of the oblique grooves.

In conclusion, it should be noted that the implementation of the oblique grooves on the field on the inner cylindrical surface of technologically more simple operation than running grooves on the cylinder in the prototype. Accordingly, multiperiod the groove easier to perform on the outer surface. Cutting such grooves can be produced on a conventional milling machine using simple devices. This, of course, extends the use of the proposed transfer in the simplest mechanisms, where the main requirement is the cheapness of the gear unit.

Claims

1. Ball cylindrical transmission containing three consistently covering each other, a cylindrical casing, facing each other, the surfaces of the two outer clips made periodic raceway sine wave and oblique groove, and the average clip is made with a through longitudinal slits, which are rolling elements, are in constant contact with both tracks, characterized in that the generatrix of the surface for both raceways is a sphere with its center lying on the axis of the cylindrical casing.

2. Ball cylindric.

3. Ball cylindrical transfer under item 1 or 2, characterized in that it is made double row.

 

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