RU2520887C1 - Planetary gear - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: planetary gear comprises an eccentric planet carrier (1), two planet pinions (2) with outer teeth, a stationary central gear wheel (3) with inner teeth, a driven shaft (4) and a mechanism to take over the motion from the pinions consisting of two unsupported disks (6) with holes where rubber bushes (7, 8) are set with tension, of pins (5) of the driven shaft and pins (9) of the pinions. Half of the rubber bushes (7) is set with tension on the pinions pins (9), the other half (8) - on the pins (5) of the driven shaft (4). Radial shift of every pinion (2) for the value of gear interaxle distance is provided by the summation of the deformation of the rubber bushes (7) set on the pinion pins (9) and of the radial movement of the unsupported disks (6) due to the deformation of rubber bushes (8) set on the driven shaft pins (5).

EFFECT: in the process of force and movement transfer the rubber bushes set in the holes of unsupported disks and on the pins provide for damping of impact loads reducing noise level.

2 dwg

Description

The invention relates to the field of engineering and can be used in all sectors of the economy, in particular in high-speed, lightly loaded drives.

Known planetary gear with gear or pinwheel gearing of wheels containing a leading eccentric carrier, one or two satellites, a fixed central wheel, a driven shaft and a mechanism for removing motion from the satellites, made in the form of the fingers of the driven shaft and mounted on them pin, located freely in the holes of the satellites (Kudryavtsev V.N. Planetary gears. M.-L .: Engineering, 1966.- P. 260, Fig. 147, a) (prototype).

The disadvantage of this design is the high noise level due to the presence of large gaps between the sprockets and the mating fingers and satellites, which leads to the appearance of shock loads during the rotational movement of the satellites.

The objective of the invention is to reduce noise.

For this, in a planetary gear containing a leading eccentric carrier, two satellites, a fixed central wheel, a driven shaft and a mechanism for removing motion from the satellites, the mechanism for removing motion from the satellites is made in the form of two unsupported disks with holes, rubber bushings, fingers of the driven shaft and fingers of the satellites ; moreover, one half of the rubber bushings is fitted with an interference fit in the holes of the non-supported disks and on the fingers of the satellites, the second - in the holes of the non-supported disks and on the fingers of the driven shaft.

Reducing the noise level is achieved due to the implementation of the mechanism for removing movement from satellites in the idea of discs mounted through rubber bushings on the fingers of the driven shaft and on the fingers of the satellites, which ensures the absence of gaps between the mating elements and the damping of shock loads during the rotational movement of the satellites.

In FIG. 1 is a sectional perspective view of a planetary gear; FIG. 2 is a view along AA in FIG. one.

The transmission contains a leading eccentric carrier 1; two satellites 2; fixed central wheel 3; driven shaft 4 with the fingers of the driven shaft 5 rigidly connected to it; two unsupported disks 6; rubber bushings 7, 8; satellite fingers 9; satellite bearings 10; bearings of the leading eccentric carrier 11; bearing of the driven shaft 12; mounting ring 13; covers 14 and 15.

The satellite 2 is made with external teeth, an annular groove for locating the support disk 6 in it, holes for rigid connection with the fingers of the satellite 9 and holes for arranging the fingers of the driven shaft 5, the diameter of which is greater than the diameter of the fingers of the driven shaft 5 by at least two axle transmission distances a _w . The fixed central wheel 3 is made with internal teeth in one piece with the gear housing.

The rubber bushings 7, 8 are fitted with an interference fit in the holes of the support disk 6 and are tightened on the fingers of the satellites 9 and the fingers of the driven shaft 5. The fingers of the satellites 9 are rigidly connected to the satellite 2, the fingers of the driven shaft 5 are rigidly connected to the driven shaft 4 and the mounting ring 13 The radii of the circles of the location of the centers of the holes of the support disk 6 and satellite 2, as well as the angular steps of the holes in these parts are the same.

The planetary gear assembly is carried out in the following sequence.

The fingers of the satellites 9 with rubber bushings 7 seated on them with an interference fit are installed in a tight fit in the holes of the satellites 2 and are expanded. The rubber bushings 8 are tightened in the holes of the non-supported discs 6, after which the non-supported discs 6 are fitted with bushings 8 with an interference fit on the fingers of the driven shaft 5. The satellites 2 are mounted on the non-supported discs 6 so that the rubber bushings 7 are tightened into the holes of the non-supported discs 6 ( interference increases the stiffness of the bushings and reduces the play backlash). The leading eccentric carrier 1 is inserted into the central holes of the satellites 2, then the bearings of the satellites 10 are installed on the seating surfaces of the leading eccentric carrier 1 and the satellites 2. Bearings 11 are mounted on the leading eccentric carrier 1. The driven shaft 4 is seated with holes on the bearing of the leading eccentric carrier 11 and the fingers of the driven shaft 5, which, after landing on them, the mounting ring 13 is expanded. After that, the satellite block is axially displaced into engagement with the fixed central wheel 3. The bearing of the driven shaft 12 is inserted into the cover 14, then the covers 14, 15 are mounted in the fixed central wheel 3 and are simultaneously mounted on the driven shaft 4 and the bearing of the driving eccentric carrier 11.

The transfer works as follows.

Rotational movement is transmitted from the leading eccentric carrier 1 by means of engagement with the fixed central wheel 3 to the satellites 2, from them through the fingers of the satellites 9 and the rubber bushings 7 to the support discs 6, and from them through the rubber bushings 8 and the fingers of the driven shaft 5 to the driven shaft 4. In this case the radial displacement of the axis of each satellite 2 relative to the transmission axis, equal to the interaxal distance a _w , consists of the displacement caused by the pressing of the fingers of the satellite 9 into the rubber bushings 7 by a value a ₁ , and the displacement caused by the radial By moving the unsupported disk 6 by a value of ₂ as a result of pressing the fingers of the driven shaft 5 into the rubber bushings 8, that is, a _w = a ₁ + a ₂ .

а₂), что предотвращает быстрый выход их из строя при демпфировании ударных нагрузок и снижении уровня шума.Thus, the relatively large radial displacement of the satellite a _{w is} ensured by two small deformations a ₁ and a _{2 of the} rubber bushings 7, 8 (a ₁ $$\approx$$

and ₂ ), which prevents their rapid failure when damping shock loads and reducing noise.

THE SOURCE OF INFORMATION

1. Kudryavtsev V.N. Planetary gears. M.-L.: Mechanical Engineering, 1966.-S. 260, fig. 147, a (prototype).

Claims (1)

A planetary gear containing a leading eccentric carrier, two satellites, a fixed central wheel, a driven shaft and a mechanism for removing motion from satellites, characterized in that the mechanism for removing motion from satellites is made in the form of two unsupported disks with holes, rubber bushings, fingers of the driven shaft and fingers satellites; moreover, one half of the rubber bushings is fitted with an interference fit in the holes of the non-supported disks and on the fingers of the satellites, the second - in the holes of the non-supported disks and on the fingers of the driven shaft.

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