JPH11101333A - Planetary gear part bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fetch supplied lubricating oil efficiently to a maximum limit in the inside of a bearing, improve lubricating performance inside the bearing and its durability. SOLUTION: In an outer ring 21, in one side width surface opposed to at least an oil supply means, an oil scoop ring 26 is provided. This oil scoop ring 26, consisting of an annular thin plate, has a fixed part 26a fixed to the outer ring 21 in the peripheral side and an oil receiver part 26b receiving lubricating oil sprung by centrifugal force to the internal peripheral side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing used for a planetary gear section of a vertical gear reduction (increase) apparatus for general industrial machines.

[0002]

2. Description of the Related Art As a vertical gear reduction (speed-up) device for general industrial machines, for example, as shown in FIG. 4, a vertical gear reduction device using a planetary gear mechanism is known. This vertical gear reduction device has an input shaft 2 having a sun gear 1 integrally or separately provided at a shaft end thereof, and an output shaft 3 meshing with the sun gear 1.
A plurality of planetary gears 4 held rotatably and revolvably by an internal gear 5 and an internal gear 5 meshed with each planetary gear 4 on an inner peripheral surface thereof
And a cylindrical housing 7 fixed to a fixing member 6 such as a motor case by an appropriate fixing means.

The output shaft 3 is coaxially arranged with the input shaft 2 and rotatably held by a bearing 8 fitted on a fitting surface of a housing 7. A plurality of (the same number as the planet gears) holding shafts 9 are provided integrally or separately, and the holding shafts 9 rotatably hold the planetary gears 4 via bearings 10.

In such a configuration, when the input shaft 2 is rotated, each planetary gear 4 revolves while being rotated by meshing with the sun gear 1 of the input shaft 2 and the internal gear 5 of the housing 7, thereby revolving. The output shaft 3 holding the gear 4 is rotated at the reduced number of revolutions of the planetary gear 4 in the same direction as the input shaft 2.

Conventionally, in the above-described vertical gear reduction device, the bearing 10 for rotatably holding the planetary gear 4 on the holding shaft 9 of the output shaft 3 has a spherical orbit formed on the inner peripheral surface as shown in FIG. An outer race 11, an inner race 12 having a double row of raceways formed on the outer peripheral surface, a double row barrel-shaped roller 13 for transferring between the raceways of the outer and inner races 11 and 12, and rollers 13 are held at equal circumferential intervals. The retainer 14 is a main component. This bearing 10
Rotates the planetary gear 4 on the holding shaft of the output shaft by fitting and fixing the planetary gear 4 on the outer peripheral surface of the outer ring 11 and fitting and fixing the inner ring 12 on the holding shaft of the output shaft (not shown). Hold as possible.

[0006] Since lubrication of the bearing 10 involves the revolution of the planetary gear 4, as shown in FIG. 4, oil is usually supplied by dripping or injection from a plurality of oiling nozzles 15 fixed to the housing 7. It is.

[0007]

As described above, lubrication of the bearing 10 used for the planetary gear 4 of the vertical gear reduction device is performed by dropping or spraying oil from a fueling nozzle 15 fixed to the housing 7. However, since the planetary gear 4 revolves, in the bearing 10 of the conventional structure shown in FIG. 5, the supplied lubricating oil is hardly splashed off by centrifugal force and flows into the bearing, and the lubrication performance inside the bearing is concerned. Therefore, there is a possibility that the durability of the bearing is reduced.

Therefore, the present invention aims to efficiently take the supplied lubricating oil into the interior of the bearing as efficiently as possible to improve the lubrication performance inside the bearing and the durability of the bearing.

[0009]

In order to solve the above-mentioned problems, according to the present invention, at least lubrication means for the outer ring is provided so that the supplied lubricating oil does not escape to the outside of the bearing even if the lubricating oil is splashed by centrifugal force. An oil scoop ring was provided on the opposite one side width surface.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 illustrates a planetary gear unit bearing 20 using a double-row self-aligning rolling bearing. This bearing 20
Includes an outer ring 21 having a spherical orbit on the inner peripheral surface, an inner ring 22 having a double row of orbits on the outer peripheral surface, and outer and inner rings 21 and 22.
Double row roller 23 that transfers between orbits, and roller 2
The main components are a retainer 24 that holds 3 at equal circumferential intervals. A planetary gear 25 is fitted and fixed to the outer peripheral surface of the outer ring 21 (the planetary gear 25 may be integrally formed with the outer peripheral surface of the outer ring 21). Further, the inner peripheral surface of the inner ring 22 is illustrated. The holding shaft of the output shaft is not fitted and fixed.

The bearing 20 differs from the conventional structure shown in FIG. 5 in that an oil scoop ring 26 is provided on the upper width surface of the outer ring 21. Oil scoop ring 26
For example, it is made of a metal annular thin plate,
a and an outer ring 21 and an inner ring 22 on the inner peripheral side.
Of the outer race 21 by snap-fitting the fixing portion 26a into an annular fixing groove 21a formed in the upper width surface of the outer race 21 via a snap ring 27. It is provided on the upper width surface.

As described above, the oil scoop ring 26 is provided on the upper width surface of the outer ring 21 so that the lubricating oil supplied from the oil supply nozzle by dropping or spraying can be supplied to the planetary gear 2.
Even if the lubricating oil is splashed off by the centrifugal force associated with the revolution of No. 5, the lubricating oil is received by the oil receiving portion 26b of the oil scoop ring 26 and hardly scatters outside the bearing. This allows the supplied lubricating oil to be efficiently and maximally taken into the inside of the bearing, so that good lubrication performance inside the bearing is ensured and the durability of the bearing is also improved.

In the above embodiment, the oil scoop ring 26 is fitted and fixed via the snap ring 27 in the annular fixing groove 21a formed on the upper width surface of the outer race 21. As shown in FIG. 2, the outer peripheral portion of the fixed portion 26a of the oil scoop ring 26 is
It is also possible to fix by caulking in an annular fixing groove 21a formed on the upper width surface of the upper part.

Further, in the above embodiment, the oil scoop ring 26 is fixed in the annular fixing groove 21a formed on the upper width surface of the outer ring 21. However, as shown in FIG. Oil scoop ring 2 on width
6 can be attached and fixed by appropriate means such as screwing.

In the above embodiment, the oil scoop ring 26 separate from the outer ring 21 is fixed to the outer ring 21, but the outer ring 21 is provided with the oil receiving portion 26b of the oil scoop ring 26 as an integral structure. You may.

Although the oil scoop ring 26 is made of metal in the above embodiment, the present invention is not limited to the material of the oil scoop ring 26.

In the above embodiment, the oil scoop ring 26 is provided only on the upper width surface of the outer ring 21.
Oil scoop rings 2 on the upper and lower width sides of 1
6 can be provided. In short, the oil scoop ring 26 may be provided on at least one width surface of the outer ring 21 facing the oil supply nozzle.

In the above embodiment, a double-row self-aligning rolling bearing is used. However, the present invention can use other than a double-row self-aligning rolling bearing.

Further, in the above description, the case where the present invention is applied to a vertical gear reduction (increase) apparatus has been described, but the present invention is also applicable to a horizontal gear reduction (increase) apparatus.

[0021]

As described above, according to the present invention,
By providing an oil scoop ring on at least one width surface of the outer ring with planetary gears facing the oil supply means, the lubricating oil supplied from the oil supply means can be efficiently and maximally taken into the inside of the bearing, and the lubrication performance inside the bearing and the lubrication performance of the bearing Durability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a planetary gear unit bearing of the present invention.

FIG. 2 is a sectional view of a main part showing another method of fixing the oil scoop ring.

FIG. 3 is a sectional view of a main part of a planetary gear unit bearing according to another embodiment of the present invention.

FIG. 4 is a schematic sectional view of a vertical gear reduction device.

FIG. 5 is a sectional view of a main part of a conventional planetary gear unit bearing.

[Explanation of symbols]

 Reference Signs List 20 planetary gear bearing 21 outer ring 22 inner ring 23 roller 24 retainer 25 planetary gear 26 oil scoop ring 26a fixing part 26b oil receiving part 27 snap ring

Claims (1)

[Claims] 1. A planetary gear unit bearing comprising an outer ring and an inner ring, and rolling elements equally disposed via a retainer between the outer ring and the inner ring, wherein a planetary gear is disposed on an outer peripheral surface of the outer ring. A planetary gear unit bearing provided with an oil scoop ring formed of an annular thin plate and having an oil receiving portion for preventing scattering of lubricating oil supplied from the oil supply means, on one width surface opposite to the oil supply device.