RU2762981C1 - Orbital reducer - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanical engineering, in particular to a gearbox and can be used to replace the known gearboxes of two, three, four-stage, worm, planetary and wave gearboxes. A gearbox is a device used in drives of machines, machine tools, with the help of which the transmission and conversion of torque is carried out. The effect is achieved by the design of the proposed orbital gearbox containing a housing and a cover, between which an outer ring is installed, containing on its inner surface toothed protrusions. An input high-speed shaft runs through the hole in the cover and is mounted in at least one bearing located in the hole in the cover. At the end of the input high-speed shaft, an eccentric shaft having an offset axis of rotation is rigidly fixed in at least one bearing. In this case, the output shaft is made of a single piece consisting of an inner ring containing on the outer surface toothed protrusions interacting with the protrusions on the outer ring, a base having an internal cavity interacting through at least one bearing with the said eccentric shaft, and the working part of the shaft mounted on at least one bearing in the housing outlet. In this case, the input and output shafts are on the same axis of rotation.

EFFECT: increasing the reliability and durability of the device, simplifying the design of the gearbox, reducing the dimensions of the rotation transmission units and the gearbox as a whole.

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Description

The invention relates to mechanical engineering, in particular to a gearbox and can be used to replace the known gearboxes of two, three, four-stage, worm, planetary and wave. A gearbox is a device used in drives of machines, machine tools, with the help of which the transmission and conversion of torque is carried out.

There is a known method of operation of a three-stage planetary gearbox, implemented in a three-stage planetary gearbox (Rudenko V.N. sequentially installed planetary gear sets.

The closest to the invention in technical essence is RU 180912 U1, 06/29/2018 planetary single-stage gearbox containing a satellite mounted for rotation on the eccentric of the high-speed shaft and meshed with a gear wheel installed in the gearbox housing, while it is fixed concentrically on the satellite to the ring gear, a bushing supported by a bearing mounted on an eccentric bushing fixed on a low-speed output shaft.

The disadvantage of the closest analogue is the weak reliability of the rotation transmitting unit, the large dimensions of the rotation transmission units, as well as the complexity of the device design.

The objective of the proposed invention is to refine the design of the device to eliminate the indicated disadvantages of the prototype.

The technical result of the proposed solution is to increase the reliability and durability of the device, simplify the design of the gearbox, reduce the dimensions of the rotation transmission units and the gearbox as a whole.

This result is achieved by the design of the proposed orbital gearbox, containing a housing and a cover, between which an outer ring is installed, containing on its inner surface toothed protrusions, an input high-speed shaft passes through the hole in the cover, installed in at least one bearing located in the hole of the cover, on the end of the input high-speed shaft is rigidly fixed in at least one bearing, an eccentric shaft having an offset axis of rotation, while the output shaft is made of a single piece consisting of an inner ring containing on the outer surface toothed protrusions interacting with protrusions on the outer ring, a base having an internal cavity interacting through at least one bearing with the said eccentric shaft, and a working part of the shaft mounted on at least one bearing in the housing outlet, while the input and output shafts are located on the same axis of rotation.

Preferably, the number of teeth of the inner ring is less than the number of teeth of the outer ring by exactly one tooth.

Further, the proposed invention will be discussed in detail taking into account the illustrations, where on

fig. 1 shows a general view of the proposed gearbox in two projections.

FIG. 2 section of the gearbox A-A according to FIG. one.

FIG. 3 general view of the proposed gearbox.

FIG. 4 is a section of the gearbox C-C according to FIG. 2.

Brief description of structural elements:

1 - case;

2 - cover;

3 - outer ring;

4 - input high-speed shaft;

5 - eccentric shaft;

6 - output shaft;

7 - inner ring;

8 - base;

9 - the working part of the shaft;

Z is the axis of rotation.

The orbital gearbox contains a housing 1 and a cover 2, between which an outer ring 3 is installed and fixed, containing on its inner surface toothed protrusions. The outer ring 3 is fixed between the body 1 and the cover 2 by means of bolted connections, while it is preferable to install these elements by means of additional interaction of protrusions and recesses on these elements 1-3. An input high-speed shaft 4 passes through the hole in the cover 2, installed in at least one bearing located in the hole of the cover 2. In this case, it is advisable to place a collar in the hole in the cover 2 to prevent dust / moisture from entering the internal mechanism, as well as to prevent loss of lubricant ...

At the end of the input high-speed shaft 4 is rigidly fixed in at least one bearing, preferably two, an eccentric shaft 5 having an offset axis of rotation (Z) relative to the input shaft 4. It is possible to make the input high-speed shaft 4 with an eccentric shaft 5 as a single monolithic part.

The output shaft 6 has a stepped shape and is made of a single piece consisting of an inner ring 7 containing on its outer surface toothed projections interacting when working with projections on the outer ring 3. Base 8 having an internal cavity interacting through at least one bearing, preferably two, with the above-mentioned eccentric shaft 5, and the working part 9 of the shaft, installed in at least one bearing in the outlet of the housing 1. In this case, in the opening of the housing 1, at the outlet of the working part of the shaft 9, it is also desirable to place a collar. Input 4 and output 6 shafts are on the same axis of rotation, and the eccentric shaft 5 has an offset axis of rotation. In this case, the number of teeth of the inner ring 7 is less than the number of teeth of the outer ring 3, while it is preferable that the number of teeth of the inner ring 7 is less than the number of teeth of the outer ring 3 by exactly one tooth, i.e. for example, the outer ring has 30 teeth and the inner ring has 29 teeth. This ratio will provide a gear ratio of 1:30, although depending on the need to obtain a different gear ratio and rotational speed, the number of teeth can be selected. Alternatively, the bearings mentioned can be replaced by sleeve bushings.

The execution of the output shaft 6 from a single part provides an increase in the reliability and durability of this unit and the device as a whole, since in this embodiment, the shaft 6 does not contain nodes and interface elements (bushings and bearings, as in the prototype) with each other, while, with other equal thicknesses , materials and diameters, a single one-piece part of the output shaft 6 will always be stronger in bending, torsion and other loads experienced in the gearbox assemblies, and therefore more durable. In addition, the exclusion of mating elements in the output shaft 6 will also further simplify the design of the gearbox, since this unit is made and operates as simply as possible without any additional auxiliary elements of the mechanism (bearings, bushings, etc.), as in the known analogue. In addition, due to the fact that the input high-speed shaft 4 with the eccentric shaft 5 is located inside the output shaft 6 (the inner cavity of the base 8), a significant reduction in the dimensions of the rotation transmission units is also provided.

The device works as follows.

The input shaft 4 of the gearbox receives rotation and transmits it to the eccentric shaft 5. The eccentric shaft 5 rotates in the bearing (s) and, due to the displaced axis of rotation, transfers motion to the outer toothed protrusions of the inner ring 7, which, in turn, begins to interact and move along the toothed protrusions of the outer ring 3, thereby creating a minimum movement of the output shaft 6, that is, in one revolution of the inner ring 7 around the outer ring 3, the output shaft 6 is displaced by exactly one tooth (with a teeth ratio of 30 to 29). Since the output shaft 6 is made of a single piece, this ensures the transmission of rotation through the base 8 to the working part 9 of the shaft installed in the bearing (s), while at the output (working part 9) there is a significant deceleration of the rotational speed of the output shaft 6.

The proposed invention improves the reliability and durability of the device, simplifies the design of the gearbox, and reduces the size of the rotation transmission units and the gearbox as a whole.

Claims (2)

1. Orbital gearbox, characterized in that it contains a housing, a cover, a high-speed shaft installed in at least one bearing located in the hole of the cover, an output shaft, characterized in that an outer ring is installed between the housing and the cover, containing on its inner surface toothed protrusions, the input high-speed shaft passes through the hole in the cover, at the end of the input high-speed shaft, an eccentric shaft with an offset axis of rotation is rigidly fixed in at least one bearing, while the output shaft is made of a single piece consisting of an inner ring containing on the outer the surface of the toothed protrusions interacting with the protrusions on the outer ring, the base, which has an internal cavity interacting through at least one bearing with the said eccentric shaft, and the working part of the shaft mounted on at least one bearing in the outlet of the housing, while the inlet and the output shafts are on the same axis of rotation. 2. Orbital reducer according to claim 1, characterized in that the number of teeth of the inner ring is less than the number of teeth of the outer ring by exactly one tooth.

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