JP2000230545A - Reduction gears - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate adjustment, while eliminating working of a case by providing a sliding bearing for supporting a rotary shaft of a reduction gear, so that an axis of the inner diameter is decentered from an axis of the outer diameter. SOLUTION: In any one side bearing 11 of a rotary shaft, and axis A of the inner diameter 11a is decentered with respect to an axis B of the outer diameter 11b by ΔC. Since the axis A of the inner diameter 11b and an axis of rotary shafts 2, 4 or 7 coincide with each other and the axis B of the outer diameter 11b and an axis of a circular opening 10 provided in both sidewalls of a case 9 of a reduction gear coincide with each other, when the sliding bearing 11 is rotated along the circular opening 10, the axis A of the rotary shafts 2, 4 or 7 draws a circular locus at radius ΔC around the axis B of the circular opening 10. Consequently, when tooth bearing of a gear 6 and a gear 8 is poor because an axis 4a of the rotary shaft 4 and an axis 7a of the rotary shaft 7 are not in parallel with each other on the same flat surface, both the axes 4a, 7a are adjusted so as to be in parallel with each other on the same flat surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer, and more particularly, to a speed reducer capable of easily adjusting the gear contact between gears meshing with each other.

[0002]

2. Description of the Related Art When a gear of a speed reducer is damaged, in the case of a small speed reducer, the speed reducer is replaced with each case of the speed reducer, but in the case of a large speed reducer, the case is replaced with each case. This requires a lot of effort, so usually only the damaged gear pair is replaced with a new one.

[0003] Even if the gears are replaced, since the service life of large reduction gears is generally long, the case itself of the reduction gears is often distorted. Since the axes of the shafts are not parallel to each other, the contact of the teeth is poor and the shaft cannot be used.

Therefore, circular openings provided on both side walls of the case of the speed reducer for mounting a slide bearing for supporting the rotating shaft of the gear are made larger than before so as to mesh with each other. The rotation axes of the gears are adjusted so as to be parallel, so that the gear contact is improved.

[0005]

However, the above-mentioned conventional method of adjusting the tooth contact with the replacement of the gears of a large-size reduction gear has the following problems.

[0006] Normally, the tooth contact is adjusted in the following procedure. (1) The positions of the respective axes of the rotating shafts of a pair of gears to be replaced are measured, and if the axes are not parallel on the same plane, the case of the reduction gear is shifted to shift the positions of the axes. The hole for mounting the bearing of the rotating shaft provided on the side wall of the shaft is processed to enlarge the hole. (2) Install a new gear. (3) The tooth contact of the newly incorporated pair of gears is confirmed by painting, for example, Komeitan. (4) If the tooth contact is not good, the gear is processed manually on site. (5) Keep using it until the next repairable date. (6) Repeat (3) and (4) again on the next repair date.

As described above, since gear processing is required, a long time is required for repair, and adjustment work needs to be repeated at a monthly cycle in order to sufficiently improve the blade contact.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and does not require the machining of a case when replacing the gears of a large-size reduction gear. It is an object of the present invention to provide a speed reducer that can easily perform the speed reduction.

[0009]

In a reduction gear according to the present invention, a slide bearing for supporting a rotation shaft of a reduction gear is formed by a slide bearing having an inner diameter eccentric relative to an outer diameter axis. It is what it was.

Further, both ends of a rotary shaft of the reduction gear are supported by the eccentric sliding bearings.

In the speed reducer according to the present invention, when a pair of gears engaged with each other are replaced together with the rotating shaft, if the tooth contact of the replaced pair of gears is poor, a speed reducer equipped with a sliding bearing is provided. Is rotated along the circular opening provided in the side wall of the case.

The shaft center of the inner diameter of the sliding bearing that supports the rotating shaft of the gear is in relation to the outer diameter of the sliding bearing and, consequently, of the circular opening provided in the side wall of the case of the speed reducer. Because of the eccentricity, the axis of the inner diameter of the sliding bearing and the axis of the rotating shaft of the gear are the radius of eccentricity about the axis of the circular opening of the case of the reducer. Move along a circular orbit.

[0013] The poor gear contact of the gears is due to the fact that the rotation axes of a pair of gears are not parallel on the same plane. By moving the position of the shaft center of the rotating shaft by rotating the sliding bearing as described above, the rotating shafts of both gears can be in a parallel state on the same plane, and the tooth contact can be improved. Becomes

Although the tooth contact can be improved to some extent only by changing the position of the shaft on one side of the rotating shaft of the gear, it is preferable to change the position of both shafts of the rotating shaft of the gear arbitrarily. However, since a further improvement effect can be expected, it is preferable that the bearing is supported by a slide bearing in which both sides of the rotating shaft of the gear are eccentric.

[0015]

Embodiments of the present invention will be described with reference to the drawings. 1A and 1B are explanatory views of a speed reducer according to an embodiment of the present invention. FIG. 1A is a plan view, and FIG.
It is an arrow view.

In this speed reducer, the driving force of the electric motor 1 is controlled by a gear 3 attached to a rotating shaft 2 directly connected to the electric motor 1.
The gear 5 larger than the gear 3 attached to the rotating shaft 4
And transmitted by another gear 6 attached to the same rotating shaft 4 to a gear 8 larger than the gear 6 attached to the rotating shaft 7.

The driving force transmitted in this manner is transmitted to equipment such as a rolling mill by the rotating shaft 7.

The rotating shafts 2, 4 and 7 of the above-described speed reducer
Both ends are supported by cylindrical sliding bearings 11 in circular openings 10 provided on both side walls of a case 9 of the speed reducer.

In this sliding bearing 11, at least one of the bearings 11 on the rotating shaft has a shaft center A having an inner diameter 11a and a shaft center B having an outer diameter 11b, as shown in FIG. , ΔC. The axis A of the inner diameter 11a and the axis of the rotary shaft 2, 4 or 7 are provided in the same manner, and are provided on both side walls of the axis B of the outer diameter 11b and the case 9 of the speed reducer. Is manufactured so as to be the same as the axis of the circular opening 10, so that the sliding bearing 11 is connected to the circular opening 10.
Is rotated along the axis A of the rotation axis 2, 4 or 7
Draws a circular locus of radius ΔC around the axis B of the circular opening 10.

Therefore, for example, when the gears 6 and 8 have poor tooth contact, the axis 4a of the rotating shaft 4 and the rotating shaft 7
Is not parallel to the axis 7a of the rotating shaft 4, the sliding bearing 11 on one or both sides of the rotating shaft 7 is rotated while the rotating shaft 4 is fixed, and the axis 4a of the rotating shaft 4 is If the axis 7a of the rotating shaft 7 is adjusted so as to be parallel on the same plane, the tooth contact is improved.

If the eccentricity ΔC is increased, it may be difficult to make adjustments. However, when a new gear is incorporated, the eccentricity of the equipment may be measured in advance. The adjustment is a small value because it is caused by a shaft center measurement error and a gear processing error, and the eccentricity ΔC may be determined based on those values.

As described above, in the speed reducer of the present invention, the gear contact of the large speed reducer can be changed in a short time because the tooth contact can be adjusted only by rotating the slide bearing.

[0023]

According to the present invention, the tooth contact can be adjusted only by rotating the bearing, so that the repair time can be reduced unlike the conventional case involving the on-site machining of the gear. Therefore, the adjustment operation for each circumference may be repeated, and the adjustment operation for tooth contact is facilitated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a speed reducer according to an embodiment of the present invention;
(A) is a plan view, (b) is an AA arrow view of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Rotating shaft 3 Gear 4 Rotating shaft 5 Gear 6 Gear 7 Rotating shaft 8 Gear 9 Case of reduction gear 10 Circular opening 11 Sliding bearing 11a Inner diameter 11b Outer diameter A Inner diameter axis B Inner diameter axis ΔC Eccentricity

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Munetsugu Yuki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3J012 AB01 BB01 EB20 FB01 HB01

Claims (2)

[Claims] 1. A reduction gear characterized in that a slide bearing that supports a rotation shaft of a reduction gear is a slide bearing in which an inner diameter axis is eccentric with respect to an outer diameter axis. 2. The reduction gear according to claim 1, wherein both ends of the rotation shaft of the reduction gear are supported by the eccentric slide bearing.