RU2589765C1 - Planetary gear - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: planetary gear includes eccentric carrier, three satellites with external teeth and holes, located symmetrically relative to plane of cross section of transmission, central wheel with internal teeth, two discs rigidly connected to each other and with output shaft tension rollers, pivotally mounted on rolling bearings and located in holes of pinions freely. Rollers are made in form of hollow cylinders with length of close to total width of three satellites, and each of them is fitted on one rolling bearing, mounted on brace.

EFFECT: invention allows to reduce radial size and cost of planetary gear.

1 cl, 2 dwg

Description

The invention relates to mechanical engineering and can be used in all sectors of the national economy, in particular in highly loaded mechanical drives.

Known planetary gear containing an eccentric carrier, two satellites with external teeth and holes, a central wheel with internal teeth, three disks with stepped holes rigidly connected by couplers to each other and with the output shaft, hollow rollers mounted freely movably in the holes of the satellites and disks and located eccentrically in two rows on couplers with a guaranteed gap (RF patent No. 2492376 C1, IPC F16H 1/32, publ. 09/10/2013, bull. No. 25).

The disadvantages of this transmission are its low technology due to the presence of stepped openings in the disks and vibration activity caused by the moment of centrifugal forces acting on two satellites displaced in opposite directions.

Also known is a planetary gear containing an eccentric carrier; three or four satellites with external teeth and holes located symmetrically with respect to the plane of the transmission cross section; central wheel with internal teeth; two disks rigidly connected to each other and with the output shaft by couplers; rolling bearings installed in discs; rollers mounted on rolling bearings and located freely in the holes of the satellites (international patent WO 2004/090377 A1, IPC F16H 1 / 32.QUASYPLANETARYGEARSYSTEM / LYKHOVYD, YuriyM. [UA / UA]; n1.Rad. Ukraine, 20-B-57070 , Kiev, 04215 (UA), 10.21.2004) (prototype).

The disadvantages of this design are its large radial size, which is due to the parallel arrangement of the couplers and rolling bearings in the disks, and the high cost due to the presence of a large number of rolling bearings.

The objective of the invention is to reduce the cost and radial size of the planetary gear.

To solve this problem in a planetary gear containing an eccentric carrier; three satellites with external teeth and holes located symmetrically with respect to the plane of the transmission cross section; central wheel with internal teeth; two disks rigidly connected to each other and with the output shaft by couplers; rollers mounted on rolling bearings and located in the holes of the satellites freely, the rollers are made in the form of hollow cylinders with a length close to the total width of the three satellites, and each of them is mounted on one rolling bearing mounted on the screed.

Reducing the cost of transmission is provided by reducing the number of rolling bearings due to the fact that each roller is made in the form of a hollow cylinder with a length close to the total width of the satellites and is mounted on only one rolling bearing. A reduction in radial size is achieved by installing hollow rollers through rolling bearings on the couplers.

Figure 1 shows a General view of the planetary gear in the context, figure 2 is a view along aa in figure 1.

The planetary gear contains an eccentric carrier, consisting of three eccentric rings 1 mounted motionless on the drive shaft 2, three bearings of the eccentric carrier 3, two narrow satellites 4, a wide satellite 5, a central wheel 6, two disks 7 and 8, couplers 9, rollers 10 , roller bearings 11, steel bushings 12, plastic bushings 13, housing 14.

The eccentric rings 1 are made with an eccentricity equal to the center distance of the planetary gear. The wide satellite 5 is made two times wider than the width of the narrow satellite 4. The diameter of the holes of the satellites 4, 5 is twice the outer diameter of the rollers 10 located in them by twice the distance of the center distance of the transmission. The Central wheel 6 is made with internal teeth. The disk 7 is made in one piece with the output shaft.

The eccentric rings 1 are located on the drive shaft 2 so that the landing surfaces of the two outermost ones are shifted to one side of the main axis of the planetary gear by the distance of its center distance, the middle one - in the opposite direction by the same amount. The narrow satellites 4 and the wide satellite 5 are mounted on the eccentric rings 1 by means of the bearings of the eccentric carrier 3 and engage with the central wheel 6. The central wheel 6 is fixedly mounted in the transmission housing 14.

Assembly planetary gear is as follows.

Ties 9 are pressed into the disk 7 with left steel sleeves dressed on them 12. Inside the rollers 10, bearings 11 and plastic sleeves 13 are inserted, after which the assembly units thus obtained are seated on the ties 9. Then, the right steel sleeves 12 are mounted on the ties 9 three eccentric rings 1 are mounted sequentially with two bearings 3 and satellites 4 and 5 mounted on them. The assembled block of satellites 4, 5, eccentric rings 1 and drive shaft 2 is seated with the holes of the satellites 4, 5 on the rollers 10. Disc 8 n is pressed onto the ties 9. The central wheel 6, which is fixedly mounted in the housing 14, is engaged with the satellites 4, 5.

The transfer works as follows.

The rotational movement from the drive shaft 2 is transmitted through the eccentric rings 1 and bearings 3 to the satellites 4, 5, and from them through the rollers 10 and couplers 9 to the disks 7 and 8. In this case, the plastic sleeves 13 limit the axial displacement of the bearing 11 and the roller 10, and also dampen shock loads.

Since the number of bearings 11 on which the rollers 10 are mounted is two times lower than the prototype, the cost of the proposed planetary gear design is lower by the amount corresponding to the cost of these bearings. And since in the disks 7, 8 there are only couplers 9, on which the rollers 10 are mounted through the bearings 11, the radial size of the disks 7, 8, satellites 4, 5 and the planetary gear are generally lower than that of the prototype.

INFORMATION SOURCES

1. RF patent No. 2492376 C1, IPC F16H 1/32, publ. 09/10/2013, bull. Number 25.

2. International patent WO 2004/090377 A1, IPC F16H 1/32. QUASYPLANETARY GEAR SYSTEM / LYKHOVYD, Yuriy M. [UA / UA]; n1. Rad. Ukraine, 20-B-570, Kiev, 04215 (UA), 10.21.2004 (prototype).

Claims (1)

A planetary gear containing an eccentric carrier, three satellites with external teeth and holes located symmetrically with respect to the plane of the transmission cross section, a central wheel with internal teeth, two disks rigidly connected to each other and with the output shaft by couplers, rollers mounted on rolling bearings and located in the holes of the satellites freely, characterized in that the rollers are made in the form of hollow cylinders with a length close to the total width of the three satellites, and each of them is seated on one rolling bearings mounted on the screed.

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