Planet ball transmitting unit

FIELD: mechanical engineering.

SUBSTANCE: unit comprises tree disks (1), (2), and (3) which are arranged in series along the single axis and co-operate with each other through a chain of balls (6). Each of the disks can be driving, driven, and bearing links. Intermediate disk (1) is a floating washer freely mounted on the eccentric for the interaction with balls (6) by its cylindrical side. The mating sides of disks (2) and (3) are provided with closed curved way (5) and interrupted radial grooves (4) uniformly spaced over periphery. The depth of the closed way is greater than the radius of ball (6). The cross-pieces of radial grooves (4) are provided with axial projections (9) in the zone of movement of the centers of balls (6). The surfaces of projections (9) are inscribed in the surface of closed way (4) with a spaced relation for providing mutual rotation of the disks.

EFFECT: enhanced reliability.

4 dwg

 

The invention relates to the field of General engineering, namely the transmitting node for transmitting rotation conversion speed through the chain of balls that reduce the axial size with a simple structure, which can be used in drives of machines and mechanisms very wide application.

Transmitting nodes with rolling elements and axial location of the shaft is a high bearing capacity and resistance ratio. They are easier planetary gear mechanisms, overlapping the range of gear ratios that are not available for wave transmission. In such nodes raceway balls are periodic paths, one of which is discontinuous, consisting of a set of radial holes, to determine the position of the balls.

Among the known transmitting nodes of this type are most famous are the development of Mogilev machine building Institute, called by the authors sinusoidality transmissions: SU 1260604, SU 1276869, SU 1321965. All these devices consist of three disk units. Each link has a periodic groove that interacts with the rolling elements - balls. One link is connected to the housing, and the other driven shaft, and the third is kinematically connected with the drive shaft via an eccentric. In this case, the input frame link guides what can be done with the annular groove.

In these programs is typically used disk or annular separator with radial slits. He is subjected to increased wear due to the friction of the balls on the working surfaces of the slots. Depreciation increased due to uneven load distribution on the ball. To eliminate this drawback in the known transmitting node performs various additional measures to increase the wear resistance of the separator or to improve the uniformity of load distribution on the ball. So, in the author's certificate No. 1260604, in the separator instead of the slits is made of radial grooves, allowing to increase the strength of the separator. In the author's certificate No. 1357633 the separator is designed as a set of elastically deformable consoles with radial slots in them, the elastic deformation of the consoles compensates for uneven loads and increases the strength of the separator. In copyright certificates No. 1399548, 1821597 separator is designed with additional radial slots that provide great flexibility of the walls of the separator, providing a more uniform load distribution on the ball, but significantly reduced the strength of the separator. All these additional funds, increasing the uniformity of distribution of loads on the ball, reduce the strength and durability of the transmitting node.

Naib is more close to the present invention is the decision of the copyright certificate №1260604, in which the transmitting node has three sequentially disposed along one axis of the disk, interacting with each other through chains of balls. Average disk is floating washer and planted on the Cam, and facing each other, the surfaces of the other two disks are made periodically curved closed raceway and evenly spaced around the circumference of the radial grooves. In this device by running in the separator instead of the slots of the radial grooves increase the strength of the separator. However, in this separator the point of contact of the ball with raceways opposing disks are on the edges of the raceways, so wear on the edges of the tracks from the impact on them of balls is large enough. To shift the point of contact of the balls with the raceway from the edges need to increase the depth of the track. This will lead to a decrease in the depth of the tracks on the other disc, which affects the distribution of forces at the point of contact of the ball with the second track and increases its wear.

The objective of the invention is to create a simple transmitting node with a longer lifespan. The technical result achieved by the invention consists in the displacement of the contact points of the balls from the edges of the raceways and to improve the distribution of forces at the lowest possible working volume of the sending node.

Fasting is undertaken the task is solved by that the transmitting node as the prototype contains three sequentially disposed along one axis of the disk, interacting with each other through chains of balls. Each of these disks can be the master, slave and reference links, and the average disk is floating washer, for which he freely seated on the Cam, and the effect on the chain of balls its lateral cylindrical surface. On facing to each other of the mating surfaces of the other two disks are made periodically curved closed raceway and intermittent, evenly spaced around the circumference of the radial grooves. Unlike the prototype, the depth of the closed grooves is made larger the radius of the ball by reducing the depth of the radial grooves of the same size and in the range of movement of the center of the balls jumper radial grooves have an axial protrusions, the surface of which is inscribed in the surface of the closed groove with a clearance that enables the rotation of the discs relative to each other.

The result is that the point of contact of the ball with a closed raceway, and with a radial slot is offset from the edge of the track in the region remote from him, and all the interior space between the mating surfaces of the disks, not occupied by the balls, is a power weight, to the which greatly increases the strength and durability of the transmitting node.

Further, the invention is illustrated by drawings, on which:

Figure 1 - schematic representation of the transmitting node according to this invention.

Figure 2 - schematic representation of the transmitting node with an external floating washer.

Figure 3 shows the appearance of the disk with radial grooves and balls in a perspective view.

Figure 4 on an enlarged scale schematically shows the node a in figure 1.

The transmitting node includes three disk-level 1, 2 and 3 arranged in series along a single axis. At the disks 2 and 3 facing each other, the surfaces are periodic paths 4 and 5 for the balls 6. One of the tracks is a radial grooves 4, another track 5 - closed. Average disk 1 acts on the balls 6 of its outer lateral surface 7 and a floating washer. For this he was put through the bearing 10 on the Cam input shaft 11. One of the disks 2 and 3 is a support connected to the housing, and a second output connected to the output shaft. To enhance the working parts of the links, while maintaining the dimensions and mass of the transmitting node depth of closed raceways 5 is made larger the radius of the ball 6 on the value of Δ (see Figure 4). In order that the ball was in constant contact with both raceways, the radial depth of the groove 4 must be reduced by the same amount. When the transfer of the center of each ball 6 commits radial displacement equal to the amount of eccentricity of the floating washer 1 (O1O2figure 4). In the area of travel of the centers of balls O1O2the height of the walls of the radial grooves is increased by running jumper 8 (see Figure 4) between the grooves with axial protrusions 9. The surface of the protrusions 9 fits into the closed surface of the groove 5 with a gap 12, which provides the rotation of the disks 2 and 3 relative to each other.

The result is a complete filling of the internal space of the sending node and the strengthening of the working parts of both disk elements. The points of application of forces now are not the edges of the track 5 and the groove 4, and the area that is offset from the edges, which reduces the wear of the ball, and the possibility of destruction of the tracks. With this structure, both of conduit have a higher strength and wear resistance, and the transmitting unit has a high power characteristics due to enhanced working parts of the drive. Periodic raceway 5 is made in this example in the form of a sinusoidal curved grooves, the amplitude of which does not exceed the radius of the ball 6, and the depth greater than the radius of the ball 6 on the value of Δ. Figure 1 illustrates the case with a floating washer, acting on the balls of its outer side is the again, but possible external location of the puck when it acts on the balls of his inner lateral surface. This variant of the invention shown in figure 2. Shown here in the Assembly, the transmitting node, in which the floating washer 11is an input or output element, and one of the disks 21and 31represents the base link, the other output. On one of the disks is made a closed periodic track 51and on the other - radial grooves 41. Here the floating washer acts on the balls of his inner lateral surface 71and connected through bearings 10 with the input or output shaft 11.

Operation let us consider the example of Figure 1, where the input element is a floating washer 1. Say that the disk 2 with the radial grooves 4 is a slave and connected to the output shaft. Disk 3 with a closed periodic track 5 is the support and connected to the housing of the transmitting node. During the rotation of the input shaft of the floating washer 1 its lateral surface 7 acts on the balls 6 are placed in the grooves 4, causing them to roll on a closed periodic track 5. If we turn to Figure 4, it can be seen that the radial slots 4 bulb works in a small area, shifted to the center, the value of which corresponds to the eccentricity (section O1O2), and during the political track 5 ball affects the walls of the track, remote from the centre (section bb1figure 4). I.e. the ball is constantly affected by the radial groove 4 in the field OO1and on a periodic track - in area bb1. Figure 1 shows the balance of forces acting on the contact surface of the track and ball. Here F1a force from the side of the floating washer on top of the ball, F2- reaction force acting on the ball from the walls of a closed track on the supporting disk. Under the action of these forces the ball moves along the walls of the closed paths in the azimuthal direction, pressing on the radial wall of the groove with a force F3driving disk 2 with the radial grooves in motion relative to the disk 3. Figure 3 shows that the ball 6 acts on the protrusion 9 jumper 8 radial grooves 4 in the field, remote from its edges. The impact of the balls on the walls of the periodic track 5 is also not at its edges, where it is exposed to maximum damage, and at some depth from the edges of the track that prevents them from chipping. In the book Remagnetised “Sinusoscopy reducers” (Minsk, “Vysheishaya school”, 1983, pages 74-77) shows that the greatest destruction of the tracks are in areas provides maximum curvature, and for tracks such sites are found at the edges of the walls. The proposed construction of the balls impact on sloping areas Dor the LCD with low given curvature, thus, reducing wear and extending the life of the transmitting node. In addition, with this design there is a possibility of increasing the thickness of the coaxial disk elements, increasing the load capacity of the transmission.

The device in figure 2 is similar, except that the floating washer acts on balls outside of his inner lateral surface. Here eccentric input shaft 11 covers through the bearing 10 floating washer 1’.

Its final drive ratio of such a transmitting node depends on the number of balls and periods of closed raceways balls, and what elements (1, 2, 3) is the input, output and reference.

The proposed transmitter site ceteris paribus has a simple design, high strength characteristics and an increased service life by eliminating wear of the edges of the tracks at influence on them balls.

Planetary ball the transmitting node, containing three sequentially disposed along one axis of the disk, interacting with each other through chains of balls, each of which can be the master, slave and reference links, the average disk is floating washer, for which he freely seated on the Cam and affects the chain of balls its lateral cylindrical surface is stew, and facing each other of the mating surfaces of the other two disks are made periodically curved closed raceway and dashed evenly spaced around the circumference of the radial grooves, characterized in that the depth of closed raceways made larger radius of the ball by reducing the depth of the radial grooves of the same size and in the range of movement of the centers of balls jumper radial grooves have an axial protrusions, the surface of which is inscribed in the surface of the closed groove with a clearance that enables the rotation of the discs relative to each other.



 

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FIELD: mechanical engineering.

SUBSTANCE: unit comprises tree disks (1), (2), and (3) which are arranged in series along the single axis and co-operate with each other through a chain of balls (6). Each of the disks can be driving, driven, and bearing links. Intermediate disk (1) is a floating washer freely mounted on the eccentric for the interaction with balls (6) by its cylindrical side. The mating sides of disks (2) and (3) are provided with closed curved way (5) and interrupted radial grooves (4) uniformly spaced over periphery. The depth of the closed way is greater than the radius of ball (6). The cross-pieces of radial grooves (4) are provided with axial projections (9) in the zone of movement of the centers of balls (6). The surfaces of projections (9) are inscribed in the surface of closed way (4) with a spaced relation for providing mutual rotation of the disks.

EFFECT: enhanced reliability.

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