RU2580598C2 - Backlash-free planetary-lantern gear - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building, specifically to machine drives. Planetary lantern reducer consists of a high-speed stage, wherein central wheel with half herringbone gears 2 and 3 having outer involute teeth is engaged with satellites 5 with half herringbone gears 4 and 5, cantilever-fixed on eccentric shaft 6, rotating in bearings 12 housed in cage 8 lantern transmission satellites 9 cycloid tooth profile mounted by bearings 10 on respective cams of shaft, and interacting with the bobbin 11 fixed to inner surface of housing 1. Satellites of high-speed stage 5 are fixed on eccentric shafts by seats with interference generated by movement of said satellites by nuts 17 along conical ends of eccentric shafts.

EFFECT: simplified assembly of reducer and reduction gear backlash on output link.

1 cl, 2 dwg

Description

The invention relates to mechanical engineering, and more specifically to machine drives. The predominant field of application is servo systems: CNC machines, robots, etc., which are subject to increased gear ratio requirements.

The prior art planetary-pinion gearbox, which contains a high-speed and low-speed steps. The high-speed step is an involute spur planetary gear; the low-speed gear is a pinion gear. The high-speed stage consists of a central wheel (sun) and high-speed stage satellites. The pin drive consists of eccentric shafts installed in the carrier and cycloidal satellites engaged with the pin body. The satellites of the high-speed stage are motionlessly connected with the eccentric shafts of the pin drive gear. At the same time, both high-speed satellite gears and cycloidal satellite gears (analog) are located on eccentric shafts between their supports (catalog 999016 / En / De-03.2011 // URL: http://www.sumitomodriveeurope.com/en/motion-control- drives / fine-cuclo / FC_ENG_DEU_999016_03_2011_Web.pdf). In such a gearbox, it is difficult to ensure the exact angular alignment of the high speed stage satellites relative to the eccentric shafts of the eccentric shafts and to adjust the axial clearances in the bearings of the eccentric shafts.

The closest technical solution to the proposed invention (prototype) is a planetary gear reducer, in which the high speed gear satellites are located on the eccentric shafts cantilever (High Precision Gearheads RD Series catalog // URL: http: www.nabtescomotioncontrol.com/pdfs/ RDseriesENG_005_Wed.pdf). This gearbox facilitates accurate angular alignment of the high speed stage satellites relative to the eccentrics of the eccentric shafts, but it is difficult to adjust the axial clearances in the bearings of the eccentric shafts.

The essence of the invention lies in the use of chevron transmission in the high-speed stage of a planetary-pinion gear. The technical result of the claimed invention are: simplifying the assembly of the gearbox, since the use of a chevron transmission allows you to install each of the eccentric shafts on two floating bearings; reduction of play on the output link of the gearbox, since the use of chevron transmission allows you to increase the overlap coefficient in the gears of the teeth.

The invention is illustrated in the drawing, where in FIG. 1 shows a longitudinal section through a gearbox; FIG. 2 shows a view of the gearbox on the left.

The planetary-pinion gearbox contains a housing 1, a central wheel (sun) with half-chevrons 2 and 3 having external involute teeth, high-speed gear satellites 4 with half-chevrons 4 and 5, cantilevered on the eccentric shafts 6. Two bearings 7 of each eccentric shaft in the carrier 8 (output gear link) - floating. On the eccentrics of these shafts by means of bearings 10, cycloidal satellites 9 are installed, interacting with the pins 11 mounted in the housing. Bearings 12 are carrier supports in the housing. The satellites of the high-speed stage 4 are fixed on the eccentric shafts with an interference fit created by the movement of these satellites by the nuts 17 along the conical ends of the eccentric shafts. The half-chevron 2 is made in one piece with a nozzle mounted on the shaft of the engine 16 with a collet 15, studs 14 and nut 13. The half-chevron 3 is mounted on the half-chevron 2 with the nut 18. The half-chevrons 5 are fixed on the satellite 4 with screws 19. The central wheel and the satellites of the high-speed stage are detachable to enable assembly.

The work of the planetary gear reducer is as follows. The torque from the shaft of the engine 16 through the collet 15 is fed to the central wheel with half-chevrons 2 and 3, which rotates the satellites of the high-speed stage 4 and the eccentric shafts rigidly connected to it 6. The eccentric shafts rotate in phase, and the cycloidal satellites 9 perform plane-parallel motion, rolling opposite to each other on the spindles 11. The output link of the gearbox is the carrier 8, from which the torque is removed.

The assembly of the high-speed stage begins with fixing the half-chevron 2, made in one with the nozzle, on the motor shaft 16, tightening the threaded connection of the nut 13 with the stud 14, previously wrapped in a collet 15. Install the motor in the gearbox housing 1. The satellites of the high-speed stage 4 are put on the cantilever ends of the eccentric shafts 6 and, having entered into engagement with the half wheel chevron of the central wheel 2, are fixed on the shafts 6, tightening the nuts 17. On the half-chevron 2, made in one with the nozzle, put on the half chevron 3 with its subsequent fixation by tightening the nut 18. On the satellites 4 put on the half-chevrons 5, enter them into engagement with the half-chevron 3 with their subsequent fixation by tightening the screws 19.

Thus, the claimed design of the gearbox has a large gear ratio, low backlash, which meets the requirements for high-precision drives, ease of assembly and commissioning, and, ultimately, makes the use of the gearbox economically advantageous.

The analysis of the claimed technical solution for compliance with the conditions of patentability showed that the characteristics indicated in the independent claim are interrelated with each other with the formation of a stable set of necessary features that are not known at the priority date from the prior art, sufficient to obtain the required synergistic (over-total) technical result.

The properties regulated in the claimed compound by individual features are well known in the art and require no further explanation.

Thus, the above information indicates the fulfillment of the following set of conditions when using the claimed technical solution:

- an object embodying the claimed technical solution, when implemented, is intended for use in servo systems, in CNC machines, robots, etc.

- for the claimed object in the form described in the independent claim, the possibility of its implementation using the means and methods known from the prior art on the priority date on the priority date has been confirmed;

- the object embodying the claimed technical solution, when implemented, is able to ensure the achievement of the technical result perceived by the applicant.

Therefore, the claimed subject matter meets the requirements of the patentability conditions of “novelty” and “industrial applicability” under applicable law.

Claims (1)

A planetary pinion gearbox comprising a housing with a planetary high-speed and pinwheel low-speed stages, in which the high-speed stage consists of a central wheel mounted on the motor shaft with external involute teeth and the high-speed satellite gears interacting with it, cantilevered on eccentric shafts, and the low-speed stage consists of interacting with the hand rods of the housing of cycloidal satellites mounted on bearings of eccentric shafts, which, in turn, rotate in bearings, p located in the carrier, which is the output link of the gearbox, characterized in that in order to simplify assembly and reduce play, the teeth of the planetary high-speed stage are made chevron, and both bearings of each of the eccentric shafts in the carrier are floating.

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