RU2593223C1 - Planetary gear - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to gear mechanical transmissions. Planetary gear includes eccentric carrier (1), satellites with external teeth (2), fixed central wheel with internal teeth (3), swivel casters with spherical surfaces (4), pins (5) installed in the cheek of output shaft (6). Swivel casters (4) are made hollow, and pins (5) are as cantilever beams with spherical surfaces located inside hollow swivel casters (4) and in contact with their inner cylindrical surfaces. Hollow swivel casters (4) are arranged simultaneously in apertures of satellites (2) and on pins (5) with minimum clearance letting swivel casters (4) to self-install during the motion transmission from satellites (2) through pins (5) to output shaft (6).

EFFECT: decreased axial dimension of planetary gear is achieved.

1 cl, 2 dwg

Description

The invention relates to the field of engineering, in particular to gear mechanical gears and can be used in all sectors of the economy.

Known planetary gear containing an eccentric carrier; two satellites with external teeth; motionless central wheel with internal teeth with their number 1-3 more than the number of teeth of the satellite; output shaft with a cheek; two disks rigidly connected between themselves and with the cheek of the output shaft, and prefabricated rollers located freely in the holes of the satellites, disks, and cheeks (RF patent No. 2460916, IPC F16H 1/32. Planetary gear / Plekhanov F.I., Goldfarb V. I. Publ. 10.09.2012, Bull. No. 25).

The disadvantage of this transmission is the large axial size, which is associated with the presence of two disks through which the load is transmitted from the satellites to the output shaft.

Also known is a planetary gear containing an eccentric carrier; two satellites; motionless central wheel; spherical rollers with spherical surfaces; an output shaft with a cheek and fingers installed in the cheek that connect the cheek to a disk located between the satellites. Moreover, the satellites and the disk are made with holes in which the articulated rollers are mounted movably with minimal clearances (US Pat. No. 2475662 of the Russian Federation, IPC F16H 1/32. Planetary gear / Plekhanov F.I., Perminov L.P. Publish. 02.20.2013, Bull. No. 5) (prototype).

The disadvantage of this design is also the large axial size due to the presence of a disk located between the transmission satellites.

The objective of the invention is to reduce the axial size of the planetary gear.

The solution to this problem is achieved by the fact that in a planetary gear containing an eccentric carrier; two satellites; motionless central wheel; spherical rollers with spherical surfaces; the output shaft with the cheek and the fingers installed in the cheek, the articulated rollers are hollow, and the fingers are in the form of cantilever beams with spherical surfaces located inside the hollow articulated rollers and in contact with their inner cylindrical surfaces.

The reduction in axial size is ensured by making the hinged rollers hollow, and the fingers in the form of cantilever beams with spherical surfaces located inside the hinged rollers, which does not require the use of a disk to transfer load (the load from the satellites to the output shaft is transmitted directly through the fingers).

The invention is illustrated by drawings.

In FIG. 1 shows a general sectional view of a planetary gear, in FIG. 2 is a view along A - A in FIG. one.

The planetary gear contains an eccentric carrier 1; two satellites 2; fixed central wheel 3; spherical rollers with spherical surfaces 4; fingers 5; output shaft with a cheek 6, housing 7, eccentric carrier bearings 8, satellite bearings 9, output shaft bearings 10.

The fixed central wheel 3 is made with internal teeth, the satellites 2 with the external, and the articulated rollers 4 with the hollow two external spherical surfaces and one inner cylindrical. The number of teeth of the fixed central wheel 3 is greater than the number of teeth of the satellite 2 by ΔZ = 1-3. The fingers 5 have spherical surfaces. Each satellite 2 is made with holes in the rim, the diameter of which is equal to the diameter of the spherical surface of the hinge roller 4. The cylindrical hole of the hinge roller 4 has a diameter equal to the diameter of the spherical surface of the finger 5.

The fingers 5 are pressed into the cheek of the output shaft 6. The satellites 2 are mounted by means of bearings 9 on the eccentric carrier 1 and engage with the fixed central wheel 3.

Assembly planetary gear is as follows.

The bearing of the eccentric carrier 8 is seated in the hole of the output shaft 6. The fingers 5 are pressed into the cheek of the output shaft 6. The pivot rollers 4 are mounted on the fingers 5, and the left satellite 2 with the bearing 9 installed in it and the right satellite 2 without the bearing are seated on them with their holes. After that, the satellites 2 are shifted in opposite radial directions by the amount of the center distance of the transmission each. The eccentric carrier 1 is mounted axially by bearings 8 and 9. After that, the bearing 9 is mounted simultaneously in the right satellite 2 and the eccentric carrier 1. Then, the second bearing 8 is mounted on the eccentric carrier 1, and the block of parts is inserted by axial movement inside the previously installed housing 7 wheels 3 so that the satellites 2 engage with the stationary central wheel 3. Then, bearings 10 are mounted on the output shaft 6 and at the same time in the housing 7.

The transfer works as follows.

Rotational movement is transmitted from the leading eccentric carrier 1 through satellites 2, articulated rollers 4 and fingers 5 of the driven shaft 6.

For the transmission of rotational motion and moment, the use of an additional link in the form of a disk is not required, which reduces the axial size of the planetary gear.

INFORMATION SOURCES

1. RF patent No. 2460916, IPC F16H 1/32. Planetary gear / Plekhanov F.I., Goldfarb V.I. Publ. 09/10/2012, Bull. Number 25.

2. RF patent No. 2475662, IPC F16H 1/32. Planetary gear / Plekhanov F.I., Perminov L.P. Publ. 02/20/2013, Bull. No. 5 (prototype).

Claims (1)

A planetary gear containing an eccentric carrier, two satellites, a fixed central wheel, articulated rollers with spherical surfaces, an output shaft with a cheek and fingers installed in the cheek, characterized in that the articulated rollers are hollow, and the fingers are in the form of cantilever beams with spherical surfaces, located inside the hollow articulated rollers and in contact with their inner cylindrical surfaces.

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