JPH0625653U - Oil drain structure of swing reducer - Google Patents

Abstract

(57) [Summary] [Purpose] The oil drain of the reduction gear is designed to be drained from the place where the abrasion powder generated by the gear meshing is accumulated or settled on the bearing of the output shaft or the oil seal. In a vertical planetary gear type speed reducer for transmitting the rotation of the shaft 2 of the upper hydraulic motor 1 to the lower output shaft 3, a reducer case for accommodating the upper and lower bearings 19 and 20 of the output shaft 3 is provided. A drain hole 27 is provided in the case 18 from the bottom of the lower bearing 20 to the outside of the case 18 through the outer peripheral axial direction, and the drain hole 27 has a discharge port 29 more than the bottom of the bearing 20.
Is connected to a siphon 28, which is an elastic body, which is a lower layer. [Effect] The abrasion powder at the bottom of the lower bearing is also discharged by the siphon together with the oil through the drain hole, and the abrasion powder is not accumulated in the oil around the bearing, thus improving the life of the bearing. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a turning speed reducer such as a power shovel, and more particularly to an oil drain structure of a turning speed reducer.

[0002]

[Prior art]

 Conventionally, the structure of a power shovel or the like is roughly divided into a lower traveling structure and an upper revolving structure.A revolving mechanism is provided between the lower traveling structure and the upper revolving structure. The upper revolving structure can rotate with respect to the lower traveling structure by operating the revolving mechanism of the drive source via the speed reducer. As shown in FIG. 3, the speed reducer used for the turning mechanism is provided with a two-stage planetary gear mechanism on the shaft 2 of the hydraulic motor 1 which is the drive source, and on the output shaft 3 of the final stage. Is provided with a swing pinion 4 which is a turning mechanism. The swing pinion 4 meshes with the ring gear 5 of the swing circle, which has internal teeth. Therefore, when the shaft 2 of the hydraulic motor 1 described above rotates, the swing pinion 4 of the output shaft 3 rotates, but the ring gear 5 of the swing circle meshing with the swing pinion 4 is fixed to the lower traveling body 6. Since the swing pinion 4 does not rotate, the swing pinion 4 rotates by meshing with the teeth of the ring gear 5, whereby the upper revolving structure 7 provided with the swing pinion 4 revolves around the revolving center. In this case, the first-stage sun gear 8 spline-coupled to the hydraulic motor 1 meshes with the first-stage ring gear 9 and the first-stage planetary gear 10, so that the rotation of the sun gear 8 is prevented. It is transmitted from the planetary gear 10 to the second stage sun gear 12 via the first stage carrier 11. The sun gear 12 meshes with the second stage ring gear 13 via the second stage planetary gear 14, whereby the rotation of the sun gear 12 is output from the planetary gear 11 through the second stage carrier 15 to the output. The rotation of the hydraulic motor shaft 2 is transmitted to the shaft 3, but the rotation of the hydraulic motor shaft 2 is decelerated by the speed reducer having the two-stage planetary gear mechanism as described above to rotate the output shaft 3 by the connection of the spline 16. ing. In order to lubricate the fitting portion of the spline 17 between the hydraulic motor shaft 2 and the first stage sun gear 8, the reducer case 18 is filled with lubricating oil up to the line L. In the figure, 19 and 20 are bearings, and 21 is an oil seal. In the above structure, the lubricating oil is always communicated between the bearings 19 and 20 supporting the output shaft 3. When the lubricating oil is drained by this, if the drain plug 23 that closes the horizontal hole 22 provided in the reduction gear case 18 located immediately above the bearing 20 is removed, the lubricating oil is discharged from here. It will be

[0003]

[Problems to be solved by the device]

 However, in the case where there is a grease bath 24 under the swing circle such as a power shovel and the oil in the turning speed reducer case 18 is drained, the horizontal hole of the speed reducer case 18 is set as described above. Since there are no drain holes other than No. 22, it could not be discharged anywhere other than this. However, the abrasion powder generated by the meshing of the planetary gears floats in the lubricating oil and stays in the recess 26 of the shaft end cover 25 provided at the bottom of the bearing 20 according to the gravity and accumulates and accumulates. However, in the case of oil drain, it can be discharged only from the horizontal hole 22 at a position higher than the above-mentioned bearing 20, so that the concave portion 26 is a place where sedimentation and accumulation always occurs, and if the wear powder increases, the bearing 19 or 20 is damaged or the oil seal 21 is damaged. In particular, if the oil seal 21 is damaged, the lubricating oil in the reducer case 18 will flow out to the outside such as the grease bath 24, and if the gears or bearings in the reducer case 18 are damaged by seizure, etc. There was a drawback.

In view of this, the present invention has a drain for a swing reduction gear configured to drain from a place where wear powder generated by gear meshing is retained or settled on a bearing of an output shaft or an oil seal. The purpose was to provide a mechanism to eliminate the drawbacks of the prior art.

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems of the prior art, the present invention provides a vertical planetary gear type speed reducer for transmitting the rotation of an upper hydraulic motor shaft to a lower output shaft. The reducer case that accommodates the lower bearing is provided with a drain hole extending from the bottom portion of the lower bearing to the outside of the case through the outer peripheral axial direction, and the drain hole is formed from the bottom portion of the bearing. It is also characterized by connecting an elastic siphon whose outlet is lower.

[0006]

[Action]

 With the above configuration, the floating wear powder, which has a higher specific gravity than the lubricating oil, is also discharged at the same time when the lubricating oil is discharged.

[0007]

【Example】

 FIG. 1 is a sectional view showing an embodiment of a swing speed reducer according to the present invention, FIG. 2 (a) is a sectional view taken along the line AA of FIG. 1, and FIG. 2 (b) is a modification of (a).

The present invention will be described below with reference to the embodiment shown in FIG. The parts common to those in FIG. 3 are designated by the same reference numerals as those in FIG. 3, and the description thereof will be omitted. The present invention is a vertical planetary gear type speed reducer for transmitting the rotation of the shaft 2 of the upper hydraulic motor 1 to the lower output shaft 3, and accommodates the upper and lower bearings 19 and 20 of the output shaft 3. The reduction gear case 18 is provided with a drain hole 27 communicating from the bottom of the lower bearing 20 to the outside of the case 18 through the axial direction of the outer circumference, and the drain hole 27 is provided with a drain hole 27 of the bearing 20. It is configured by connecting an elastic siphon 28 having a lower outlet 29 than the bottom.

A shaft end cover 25 is provided at the bottom of the bearing 20 and is integrally fixed to the reduction gear case 18 by fastening means such as bolts (not shown). The shaft end cover 25 is provided with an annular recess 30 which faces upward, and a part of which extends in the circumferential direction is located outside the bearing 20 of the reduction gear case 18 as shown in FIG. 2 (a). It is connected to the lower end of a drain hole 27 provided parallel to the axis of the bearing 20. Alternatively, as shown in FIG. 2 (b), the drain hole 27 'may be a square hole along the axial direction of the bearing 20 like a key groove. An upper end of the vertical drain hole 27 is formed horizontally, and a drain cock 31 that can be opened and closed by a handle is screwed into the end portion. The lower end of the cock 31 is an opening, to which the siphon 28 is connected. Then, the discharge port 29 at the lower end of the siphon 28 is provided in a length that is longer than the bottom surface of the recess 30 by H.

Next, the operation will be described. When the handle of the cock 31 is turned to the open position, the lubricating oil in the reducer case 18 and the abrasion powder accumulated in the recess 30 of the shaft end case 25 below the bearing 20 are removed by the siphon 28. Although it is sucked up through the drain hole 27 and discharged from the discharge port 29, the present invention is provided so that the length of the siphon 28 is located H below the bottom surface of the recess 30. Therefore, all the oil in the reducer case 18 is discharged. Further, since the drain hole 27 is provided at a position separated from the bearing 20, there is no possibility that abrasion powder and the like will be accumulated on the bearing 20 due to flow agitation when discharging, unlike the conventional case.

Although the present invention has been described in the embodiment as applied to a two-stage planetary gear type speed reducer, the same effect can be obtained when applied to a planetary gear type speed reducer other than two stages. Needless to say.

[0012]

[Effect of device]

 INDUSTRIAL APPLICABILITY As described above, the present invention is a vertical planetary gear type speed reducer that transmits the rotation of the upper hydraulic motor shaft to the lower output shaft. The bottom of the lower bearing is provided with a drain hole extending from the bottom of the lower bearing to the outside of the case through an axial direction, and the drain hole is provided with an elastic body having a lower outlet than the bottom of the bearing. Since the siphon is connected, the abrasion powder at the bottom of the lower bearing will also be discharged by the siphon together with the oil through the drain hole, and the abrasion powder will not be accumulated in the oil around the bearing. The bearing life can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of an oil drain structure for a swing speed reducer according to the present invention.

2A is an explanatory view showing a cross section taken along the line AA of FIG. 1, and FIG. 2B is a cross sectional view showing a modified example of FIG.

FIG. 3 is an explanatory view showing a cross section of an oil drain structure of a conventional swing speed reducer.

[Explanation of symbols]

 1 Hydraulic Motor 2 Shaft 3 Output Shaft 18 Reduction Gear Case 19, 20 Bearing 27 Drain Hole 28 Siphon 29 Discharge Port

Claims (1)

[Scope of utility model registration request] 1. A vertical planetary gear type speed reducer for transmitting the rotation of an upper hydraulic motor shaft to a lower output shaft, wherein the speed reducer case housing the upper and lower bearings of the output shaft is A drain hole communicating from the bottom of the lower bearing to the outside of the case through the outer peripheral axial direction is provided, and an elastic siphon whose outlet is lower than the bottom of the bearing is connected to the drain hole. The oil drain structure of the slewing reducer characterized by the above.