RU2700233C2 - Planetary gear with indirect teeth and versions of planetary gear with indirect teeth - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: group of inventions relates to cylindrical gear transmissions, specifically to planetary gears, particularly helical or arched teeth. Planetary gear with indirect teeth, for example of arched shape, comprises sun wheel, crown gear and satellites engaged with them. Each satellite or crown gear is composed of segmented parts and provided with means for holding the respective parts in assembled state. Transmission is assembled by sequential engagement of segment parts of satellite or crown gear with further combination of said parts into a single part.

EFFECT: higher specific load capacity of planetary transmission due to use of circular or arched tooth with provision of such transfer.

5 cl, 5 dwg

Description

The group of inventions relates to the field of cylindrical gears, namely to planetary gears, in particular with helical or arched teeth.

Widely known planetary gears with cylindrical wheels having a straight or oblique tooth (see US 3635103 A, publ., 18.01.1972).

A disadvantage of the known gears is the fundamental incompatibility of such gears due to the impossibility of introducing into engagement the closing transmission elements associated precisely with the shape of the tooth. Moreover, it is known that the specific load capacity of arched gearing is 2.5-3 times higher than that of a straight gear.

The technical result of the claimed group of inventions is to increase the specific load capacity of a planetary gear due to the use of a circular or arched tooth with ensuring the collection of such a gear.

The problem is achieved in that in a planetary gear with indirect teeth, for example, an arched form containing a sun wheel, a ring gear and gears engaged with them, according to the invention, each satellite or ring gear is made up of segment parts and equipped with means for holding the corresponding parts in assembled condition.

The task is also achieved by the fact that the segment parts can be interconnected along curved surfaces located between the vertices of the extreme teeth of the neighboring parts.

The task is also achieved by the fact that the segment parts can have protrusions or recesses, forming an assembly with other parts of the annular conical surface interacting with means for holding the segment parts in contact with its conical surface with the conical surfaces of the contracted parts.

The task in part of one variant of the method of assembling a planetary gear with indirect teeth is also achieved by the fact that one segmented part of the satellite is engaged with the sun wheel, and the other segmented part of the same satellite is engaged with the ring gear and all parts of the satellite are assembled together, followed by retention of assembled parts.

The task in part of another variant of the method of assembling a planetary gear with indirect teeth is also achieved by engaging each satellite with the sun gear, after which each segment part of the ring gear is engaged with the corresponding satellite, and all parts of the ring gear are assembled together with subsequent retention assembled parts of the ring gear.

The claimed group of inventions is illustrated using the drawings.

In FIG. 1 shows a planetary gear with arched gearing;

In FIG. 2 shows a satellite assembled from segmented parts;

In FIG. 3 shows a assembly diagram of a satellite from three segment parts;

In FIG. 4 shows an assembly diagram of a planetary gear assembly with prefabricated satellites;

In FIG. 5 shows an assembly diagram of a planetary gear assembly with an assembled ring gear.

The described planetary gear comprises a sun wheel 1, carrier 2 with axles 3, on which satellites 5 are mounted by means of bearings 4, engaged with coaxial located sun wheel 1 and ring gear 6.

In one embodiment (Fig. 2-4), a prefabricated (for example, of three segment parts 7, 8 and 9) each satellite 5 is made. On the end surfaces of each part 7, 8 and 9, protrusions 10 with a conical surface 11 can be made, which in the assembled state they form an annular protrusion, on the conical surface of which is pulled by its inner conical surface 12, for example, the nut 13, thus pulling together all parts 7, 8 and 9 of the satellite 5 together and holding them in the assembled state during transmission operation. The nuts can be screwed onto auxiliary threaded elements 14, fastened to the satellite 5 by means of a thread or by means of corresponding protrusions and grooves (not shown in the drawing).

In another embodiment, the transmission of the national team made a ring gear 6, consisting of segment parts 15. In this case, the means for holding the parts 15 in the assembled state can be made in the form of an annular band 16 mounted on the part 15 with a radial interference and additional fastening, for example, similar fixing the parts of the satellite 5 (not shown in the drawing).

When assembling the transmission with prefabricated satellites 5, the sun wheel 1 and the ring gear 6 are installed in a predetermined position and sequentially engaged with the sun wheel 1, for example, the segment part 7, then part 8 with the ring gear 6, after which the assembly is closed by part 9, tightening the assembled satellite 5 with nuts 13. The bearing 4 can be installed before closing the assembly, or before the final tightening of the assembled satellite 5. Then carry out all known operations for the final assembly of the transmission.

When assembling the transmission with the assembled ring gear 6, the satellites 5 are first engaged with the sun wheel 1. In this case, the satellites 5 can already be mounted on their axles 3 in the carrier 2. For each satellite 5, the segment part 15 of the ring gear 6 is installed in a predetermined position after which an annular bandage 16 is installed on all parts 15 with the subsequent tightening of the assembled parts using means similar to those used in the assembly of the satellites 5.

The load capacity of gears with indirect teeth is 2.5-3 times higher than the load capacity of gears with straight teeth. This quality is achieved due to the greater bending strength of the tooth and lower specific load with a comparable gear width. In addition, in the specified type of gearing, the overlap coefficient is much higher, which also affects the transmission load capacity, as well as the smoothness of its operation.

However, the use of this type of engagement is limited by manufacturing and assembly capabilities. Therefore, currently manufactured gears are used only in gears with external gearing.

The manufacture of gears with internal arched gearing is in principle solvable, however, the problem of assembling precisely planetary gears with this type of teeth has not been solved, since it is impossible to engage a closing gear element with indirect teeth.

The solution to this problem is proposed to be solved by making the constituent satellites 5 or the ring gear 6. In this case, the gear element is engaged in succession in separate parts with subsequent fixation of the assembled element in the form of a single part.

Thus, the use of the claimed inventions allows the assembly of a highly loaded, with high specific performance, planetary gear, in particular for driving fans in aircraft dual-circuit turbojet engines.

Claims (5)

1. A planetary gear with indirect teeth, comprising a sun wheel, a ring gear and gears engaged with them, characterized in that each satellite or ring gear is made up of segment parts and provided with means for holding the corresponding parts in assembled condition. 2. The transmission according to claim 1, characterized in that the segment parts are interconnected along curved surfaces located between the vertices of the extreme teeth of adjacent parts. 3. The transmission according to claim 1, characterized in that the segment parts have protrusions or recesses, which are assembled with other parts to form an annular conical surface that interacts with the means for holding the segment parts in contact with its conical surface with the conical surfaces of the parts to be contracted. 4. The method of assembling a planetary gear with indirect teeth, which consists in the fact that one segmented part of the satellite is engaged with the sun wheel, and the other segmented part of the same satellite is engaged with the ring gear and all parts of the satellite are assembled together with subsequent retention of the assembled parts . 5. A method of assembling a planetary gear with indirect teeth, which means that each satellite is engaged with the sun gear, after which each segment part of the ring gear is engaged with the corresponding satellite and all parts of the ring gear are assembled together with subsequent retention of the assembled parts.

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