JPH0828668A - Wear powder discharging structure of turning reduction gear - Google Patents

Abstract

PURPOSE:To prevent the wear powder produced by the engagement of gears of a reduction gear from affecting a bearing of an output shaft and an oil seal. CONSTITUTION:An annular projected part 19 is provided on a casing 15, a recessed part 20 to be opened toward a planetary gear mechanism is formed between the projected part 19 and the inner circumferential surface of the casing 15, and a passage 21 is communicated with the recessed part 20. The passage 21 is connected to a pipe 23 having a stop valve 24 at the outer end part through the passage 22. When a hydraulic motor 1 is rotated, the wear powder of large specific gravity relative to the lubricating oil gradually falls down into the recessed part 20, and passed by the stirring action of the lubricating oil and guided from the recessed part to the pipe 23 closed by the stop valve 24 through the passages 21, 22 and stored therein. This wear powder is discharged outside by opening the stop valve 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear type slewing reducer used for construction machines such as hydraulic excavators and hydraulic cranes, and more particularly to improvement of a structure for discharging abrasion powder of the slewing reducer. .

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators and hydraulic cranes are provided with a lower traveling structure and an upper revolving structure, and a revolving mechanism is provided between the lower traveling structure and the upper revolving structure. By driving a hydraulic motor provided on the body and operating a turning mechanism via a vertical reduction gear, the upper-part turning body is made to turn with respect to the lower-part traveling body. And, as the structure of the speed reducer, an actual Kaihei 5-733 is used.
No. 68 is available. This configuration is shown in Figure 2.
This will be described below. A two-stage planetary gear mechanism is provided on the shaft 2 of the hydraulic motor 1 for turning, and a pinion 4 meshed with the inner teeth of the inner turning wheel that constitutes the turning mechanism is provided on the output shaft 3 at the final stage. ing. Therefore, when the shaft 2 of the hydraulic motor 1 is rotated, the pinion 4 rotates along with the output shaft 3 along the inner teeth of the turning inner ring. As a result, the upper swing body is swung with respect to the lower traveling body. At this time, the first stage sun gear 5 spline-coupled to the hydraulic motor 1
The first stage ring gear 6 and the first stage planetary gear 7 mesh with each other, so that the rotation of the sun gear 5 rotates from the planetary gear 7 through the first stage carrier 8 to the second stage sun gear 9.
Is transmitted to The sun gear 9 meshes with the second-stage ring gear 10 via the second-stage planetary gear 11, whereby the rotation of the sun gear 9 is transmitted from the planetary gear 11 to the output shaft 3 via the second-stage carrier 12. It At this time, axis 2
Rotation is reduced by the speed reducer by the two-stage planetary gear mechanism and transmitted to the output shaft 3. In order to lubricate the splined shaft 2, the first stage sun gear 5 and the coupling portion 14, the casing 15 of the speed reducer is filled with lubricating oil up to the line indicated by L in the drawing. Further, 16 and 17 are bearings, and 18 is an oil seal.

[0003]

In the above configuration,
As described above, the lubricating oil stays between the bearing 16 and the bearing 17 that support the output shaft 3. However, the abrasion powder generated by the meshing of the planetary gears is gradually mixed into the lubricating oil. In the vicinity of the lower bearing 17 and the oil seal 18, the sedimentation occurs. As a result, the bearing powder and oil seal 18 may be damaged by the accumulated and deposited wear powder.

The present invention has been made in view of the above circumstances, and it is possible to prevent a rotation deceleration which can prevent the abrasion powder generated by the meshing of the gears of the reduction gear from affecting the bearing of the output shaft and the oil seal. The purpose of the present invention is to provide an abrasion powder discharging structure for a machine.

[0005]

In order to achieve the above object, the present invention provides a planetary gear mechanism for transmitting rotation of a shaft of a hydraulic motor for turning which extends downward to an output shaft of a pinion located below. In a vertical swing reduction gear provided with, the annular casing is provided toward the carrier in the surrounding casing where the planetary gear carrier to which the output shaft is connected is located,
It is characterized in that the inside of the concave portion, which is formed between the convex portion and the inner peripheral surface of the casing, and opens toward the planetary gear mechanism, is connected to the outside by a passage.

Further, a pipe is connected to the passage, and the inside of the recess is connected to the outside by the pipe.

Further, a filter is provided in the passage or the pipe.

[0008]

With the above-mentioned structure, the abrasion powder having a larger specific gravity than the lubricating oil generated in the planetary gears, the carrier, etc. is discharged into the outside through the passage after descending into the recess. The above-mentioned abrasion powder does not continue to stay and settle in the casing.

[0009]

1 is a cross-sectional view showing an embodiment of a wear debris discharging structure for a swing speed reducer according to the present invention.

An embodiment of the present invention will be described below with reference to FIG. The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof is omitted.

A turning hydraulic motor 1 has a shaft 2 extending downward.
And a planetary gear mechanism that transmits the rotation of the shaft 2 to the output shaft 3 of the pinion 4 located below is provided in the vertical direction. Surrounding casing 15 in which the second-stage planetary gear carrier 12 connected to the output shaft 3 is located
A ring-shaped convex portion 19 is provided on the carrier 12, and a concave portion 20 that opens toward the planetary gear mechanism is formed between the convex portion 19 and the inner peripheral surface of the casing 15. A passage 21 provided in the vertical direction of the casing 15 is connected to the bottom portion of the casing. The passage 21 is
In order to connect the chamber filled with the lubricating oil formed between the bearing 16 and the bearing 17 to the outside of the casing 15, it is connected to a passage 22 provided in the horizontal direction of the casing 15. Further, the passage 22 is connected to a pipe 23 having a stop valve 24 provided at a hanging outer end portion thereof, so that the abrasion powder can be connected to a lubricating oil storage portion. Further, the convex portion 25 provided on the lower side of the inlet of the passage 22 is provided to prevent the abrasion powder passed from the passage 21 to the passage 22 from being guided toward the bearings 16 and 17.

In the above structure, when the hydraulic motor 1 rotates, the gears of the planetary gear mechanism that constitutes the speed reducer mesh with each other, so that the abrasion powder is agitated and mixed in the lubricating oil. The abrasion powder having a large specific gravity with respect to the lubricating oil gradually descends into the recess 20, and is further guided from the recess 20 through the passages 21 and 22 into the pipe 23 closed by the stop valve 24 by the stirring action of the lubricating oil. Stay temporarily. The abrasion powder is discharged to the outside by opening the stop valve 24. Therefore, since the abrasion powder generated by the planetary gear mechanism does not mix into the places where the bearings 16 and 17 and the oil seal 18 are located, the influence of the abrasion powder on them can be prevented.

A similar effect can be obtained by connecting a pipe to the passage 21 and discharging the abrasion powder directly from the passage 21 to the outside.

Further, by providing a filter on the side of the convex portion 25 of the passage 22, abrasion powder passing through the passage 22 will not be absorbed by the bearing 1.
It is possible to reliably prevent the vehicle from being guided in the directions 6 and 17.

The same effect can be obtained by using a blind plug instead of the stop valve 24.

[0016]

According to the first aspect of the present invention, according to the wear powder discharging structure of the orbiting speed reducer of the present invention, the wear powder generated by the meshing of the gears of the speed reducer with the bearing of the output shaft, the oil seal and the like. Since the influence can be suppressed, the durability of the swing speed reducer can be improved.

According to the second aspect, in addition to the above-mentioned effect, a temporary structure for the abrasion powder can be provided by a simple structure using a pipe.

As an effect of claim 3, in addition to the above effect, abrasion powder can be prevented from entering the bearing side, and the abrasion powder can be reliably removed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a wear debris discharging structure for a swing speed reducer according to the present invention.

FIG. 2 is a view showing a cross section of a conventional swing speed reducer.

[Explanation of symbols]

 1 Hydraulic Motor 2 Shaft 3 Output Shaft 4 Pinion 11 Planetary Gear 12 Carrier 19 Convex 20 Concave 21 Passage 22 Passage 23 Pipe 24 Stop Valve

Claims (3)

[Claims] 1. A vertical swing speed reducer equipped with a planetary gear mechanism for transmitting the rotation of a shaft of a hydraulic motor for swivel extending downward to an output shaft of a pinion located below, which is connected to the output shaft. In the surrounding casing where the planet gear carrier is located, an annular convex portion is provided toward the carrier, and the concave portion is formed between the convex portion and the inner peripheral surface of the casing and opens toward the planetary gear mechanism. The structure for connecting the outside to the outside through a passage, and a structure for discharging abrasion powder of a slewing reducer. 2. The abrasion powder discharging structure for a swing reduction gear according to claim 1, wherein a pipe is connected to the passage, and the inside of the recess is communicated to the outside by the pipe. 3. The structure of claim 2, wherein the passage is provided with a filter.