JPS6023573Y2 - Grease injection device for sleeve bearings in gear transmissions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for injecting grease into a sleeve bearing in a gear transmission in which a part of a transmission shaft is supported by a sleeve bearing.

Generally, the transmission shaft of a gear transmission device is supported by a rolling bearing, but when a series of reduction gears is installed in a gear case with limited space, such as in the reduction gear mechanism of a small geared motor, due to space constraints, A part of the transmission shaft may be supported by a sleeve bearing that requires a small space.

In such cases, sleeve bearings tend to lack lubrication from the grease filled in the gear case compared to other rolling bearings.

In particular, since grease has a higher viscosity than lubricating oil, it is difficult to supply a sufficient amount of grease to the sleeve bearing using a splashing method that relies on the rotation of gears like lubricating oil.

For this reason, it is necessary to periodically inject grease into the sleeve bearing.

However, users in the field tend to neglect replenishing this grease.

In addition, some sleeve bearings use oil-impregnated or non-lubricated bearing materials for the metal of the sleeve bearing in order to eliminate the need for grease replenishment, but even with such sleeve bearings, when rotated for a long period of time, the lack of lubrication can cause seizures, etc. There were drawbacks that caused problems.

The purpose of the present invention is to eliminate the above-mentioned inconveniences and to provide a sleeve bearing that can automatically and forcibly inject the grease filled in the gear case into the sleeve bearing while the gear device is rotating to provide sufficient lubrication. The purpose of the present invention is to provide a grease injection device.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The drawing shows a geared motor equipped with the grease injection device of the present invention. Reference numeral 1 denotes a gear case accommodating a two-stage reduction gear train, and an output side wall 2 is formed integrally with the gear case 1.

3 is a cover on the input side, and this cover 3 is connected to the motor 4.
One end of the rotating shaft 5 of the motor 4 is supported by the cover 3 via a rolling bearing 6, and a first pinion 7 is connected to the tip of the cover 3.

Reference numeral 8 denotes an intermediate shaft on which a second pinion 9 is integrally carved, and a first stage gear 10 that meshes with the first pinion 7 is wedge-attached, and one end of the shaft is connected to the input side cover via a rolling bearing 11. 3, and the other end is supported on the side wall 2 via a rolling bearing 12.

13 is an output shaft that penetrates the side wall 2 and projects to the outside;
A second stage gear 14 that meshes with the pinion 9 is wedge-attached, and the intermediate portion passing through the side wall 2 is supported via a rolling bearing 15, but the inner end has limited space so a rolling bearing cannot be used. Since it is not possible to
An inner end portion 13a of the output shaft 13 is supported by the housing 17 via a bearing metal 18.

The holding housing 17 is provided adjacent to the outer periphery of the first pinion 7 , and an outer wall surface 19 of the holding housing 17 facing the first pinion 7 is formed into an arc-shaped curved surface concentric with the pinion 7 . close enough to partially cover the periphery of the

Reference numeral 20 denotes a grease inlet bored in the holding housing 17, which penetrates from the wall surface 19 to the metal 18, and the metal 18 is also provided with a hole 21 corresponding to the grease inlet 20.

It is preferable to use a non-lubricant bearing material such as nylon or polyacetal resin for the metal 18.
It may be an ordinary bearing base metal.

When the motor 4 operates and the series of gear trains rotates, the grease filled in the gear case 1 is transferred to each rolling bearing 11, 1.
2. Grease easily penetrates into the meshing part of the first pinion 7 and provides sufficient lubrication, while the grease adheres to the teeth of the first pinion 7 and prevents it from scattering outward due to the centrifugal force caused by its high-speed rotation. g) Its scattering is restricted by the outer wall surface 19 of the housing 17, and it is sent to the inlet 20 while being sandwiched between the tooth surface of the pinion 7 and the wall surface 19, and is fed to the inlet hole 20. The grease is sequentially pressed into the inlet 20 by the centrifugal force of the pinion 7, and is intensively fed into the sleeve bearing 16 through the inlet 20 and the hole 21. This grease allows the sleeve bearing 17 to fully penetrate deep into the metal 18. Lubricated.

Note that since the circumference of the pinion 7 and the wall surface 19 are close to each other, when the first pinion 7 is a helical gear, the gear pump works well and the grease is forcibly supplied from the inlet 20 to the bearing metal 18. transmission is carried out more effectively.

As described above, according to the grease injection device of the present invention, grease can be automatically and forcibly supplied to the sleeve bearing, which is difficult for the grease filled in the gear case to penetrate, to provide sufficient lubrication.

In addition, the outer wall surface of the holding housing provided adjacent to the outer periphery of the transmission gear is formed into an arcuate curved surface that is substantially concentric with the transmission gear, and the outer wall surface of the holding housing is formed in a circular arc shape that is approximately concentric with the transmission gear, and the outer wall surface of the holding housing is provided adjacent to the outer circumference of the transmission gear. The structure is extremely simple and the manufacturing process is easy, since a drive device for forced lubrication and other accessory devices are not required at all by just drilling a grease inlet that penetrates the shaft.

Note that the arc-shaped curved surface formed on the outer wall surface of the holding housing does not have to be a complete arc as long as it is curved so as to be close to the circumference of the pinion and partially cover it.

Therefore, the grease injection device of the present invention is suitable for lubrication of sleeve bearings, which is used when small geared motors have to incorporate a series of reduction gear trains in a limited narrow space, and the gear case of the gear system needs to be miniaturized. It is a very effective method.

[Brief explanation of drawings]

The drawings illustrate an embodiment of this invention, and FIG. 1 is a partially vertical front view of a geared motor equipped with a grease injection mechanism of this invention, FIG. 2 is an enlarged sectional view of the main part, and FIG.
It is an enlarged sectional view along the AA line of a figure. 1... Gear case, 2... Side wall, 3.
... Input side cover, 7 ... First pinion, 13 ... Output shaft, 13a ... Inner end of output shaft, 16 ...・Sleeve bearing, 17...
...Holding housing, 18...Bearing metal,
19...Outside wall surface.

Claims (1)

[Scope of utility model registration request] In a gear transmission device in which a part of a transmission shaft is supported by a sleeve bearing, a holding housing for the sleeve bearing is provided adjacent to the outer periphery of the transmission gear, and an outer wall surface of the holding housing facing the transmission gear is connected to the transmission gear. A grease inlet is formed in an arcuate curved surface substantially concentric with the gear, is disposed close to a local part of the transmission gear, and penetrates from the wall surface to the metal of the sleeve bearing. A device for injecting grease into sleeve bearings.