JPH0590022U - Swing reducer - Google Patents

Abstract

(57) [Abstract] [Purpose] Wear powder such as gears floating in the lubricating oil inside the slewing reducer installed in the slewing machine is accumulated and settled on the bearings and oil seals arranged under the case. Reduce the amount. [Structure] A spacer 5 and a tray 6 having a concave upper surface are fitted to the outer peripheral portion of the output shaft 1 between bearings 2 and 3 which support the output shaft 1 in a vertical planetary gear type speed reducer. Here, the diameter D of the outer peripheral portion of the tray is as large as possible than the diameter d of the overhang portion formed in the case 4 for holding the bearing 2, and the gap s between the outer diameter of the tray 6 and the case 4 is s. ₁ is a size as small as possible within a range where the output shaft 1 does not interfere with rotation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wear debris protection structure inside a reduction gear of a swing reduction gear mounted on a swing type machine such as a hydraulic power shovel.

[0002]

[Prior Art]

 FIG. 5 shows a cross section of a swing reducer mounted on an upper swing body for driving a swing mechanism installed between a lower traveling body and an upper swing body that constitute a swing type machine such as a hydraulic power shovel. It is a figure. A vertical two-stage planetary gear type speed reduction mechanism is fitted on the shaft 10a of the turning motor 10 as a drive source, and the swing pinion 1a formed at the lower end of the output shaft 1 at the last stage meshes with the ring gear 11 of the swing circle. is doing. Therefore, when the shaft 10a of the turning motor 10 rotates, the swing pinion 1a rotates at a reduced speed. Since the ring gear 11 meshing with the swing pinion 1a is fixed to the lower traveling body (not shown) and does not rotate, the upper revolving superstructure 12 equipped with the swing reduction gear rotates while the swing pinion 1a meshes with the ring gear 11. Will be done. In such a swing speed reducer, in order to lubricate the gears and the bearings that form the planetary gear type speed reduction mechanism, and the rotating parts such as the bearings 2 and 3 that support the output shaft 1, the case 4 up to the L line shown in the figure Lubricating oil is filled. Further, an oil seal 7 is fitted in a lower end hole of the case 4 into which the output shaft 1 is fitted to prevent leakage of lubricating oil in the case 4. In such a slewing speed reducer, abrasion powder generated by meshing of gears and rotation of the bearing portion floats in the lubricating oil and moves downward due to gravity with the passage of time, so that the lower bearing 3 and the oil sheet 7 Accumulates and precipitates in the vicinity.

[0003]

[Problems to be solved by the device]

 In such a slewing reducer, wear particles such as planet gears floating in the lubricating oil accumulate and settle over time in the lower bearing that supports the output shaft and in the oil seal fitted to the lower end of the case. These parts wear and break. In particular, if the oil seal is damaged, the lubricating oil in the reduction gear will flow out to the outside, which will cause seizure and damage to the gears and bearings in the reduction gear. The present invention aims to solve such problems.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, as a first means, in a vertical planetary gear type swing reducer that reduces the rotation of a rotary motor attached to the upper part and transmits it to the lower output shaft, The upper surface of the output shaft between the two bearings that support the bearing is a recessed upper surface for wear debris.

As a second means, instead of the tray fitted on the output shaft in the first means, a tray having a concave upper surface is fitted on the inner surface of the case between the two bearings. Alternatively, the structure is such that a tray is formed on the inner surface of the case.

[0006]

[Action]

 According to the above structure, most of the abrasion powder generated from the gears and floating in the lubricating oil settles in the tray and is prevented from reaching the lower part of the case.

[0007]

【Example】

The present invention will be described below with reference to the embodiments shown in the drawings. 1 and 2 are cross-sectional views of a vertical type planetary gear type slewing speed reducer according to the first means, and FIGS. 3 and 4 are cross-sectional views of a relevant part according to the second means. . In FIG. 1 relating to the first means, a main shaft 1 for transmitting the rotation of an unillustrated upper swing motor to a lower swing pinion 1a via a planetary gear type speed reduction mechanism includes two bearings 2 and 3 Supported by Case 4. In such a swing reduction gear, in the present invention, a spacer 5 and a tray 6 having a concave upper surface are fitted around the outer periphery of the output shaft 1 between the bearings 2 and 3. Here, as shown in the drawing, the diameter D of the outer peripheral portion of the receiving tray 6 is larger than the diameter d of the overhang portion formed in the case 4 to hold the bearing 2, and the outer diameter of the receiving tray 6 is as large as possible. The clearance s ₁ between the case 4 and the case 4 should be as small as possible within a range where interference does not occur when the output shaft 1 rotates. By attaching such a saucer 6, most of the wear debris generated in each gear part and floating in the lubricating oil is trapped in the recess of the saucer 6 as it settles over time. The wear particles that settle on the bearing 3 and the oil seal 7 are extremely small.

Next, FIG. 2 shows a case in which the receiving tray 8 in which the spacer 5 and the receiving tray 6 of FIG. 1 are combined is fitted to the outer peripheral portion of the output shaft 1. The relational dimensions and operation of the receiving tray 8 and the case 4 are shown in FIG. The same as 1.

In FIG. 3 relating to the second means, the tray 9 is fitted on the inner surface of the case 4, and the upper and lower end surfaces are fixed by being sandwiched between the bearing 3 and the case 4. . Here, the clearance s ₂ between the inner diameter of the tray 9 and the outer diameter of the output shaft 1 is made as small as possible within the range where the output shaft 1 does not interfere with the rotation, so that the abrasion powder in the lubricating oil passing through this clearance is The amount of sedimentation on the bearing 3 and the oil seal 7 is reduced. Further, in FIG. 4, a tray 4a corresponding to the tray 9 in FIG. 3 is integrally formed on the inner surface of the case 4. The operation of the embodiment shown in FIGS. 3 and 4 is similar to that of the first means.

[0010]

[Effect of the device]

 In the slewing speed reducer with this structure, most of the wear particles of the planetary gears floating in the lubricating oil move downwards over time, but most of them are trapped in the recesses of the tray and support the output shaft. The amount of stagnation and sediment on the bearing and the oil seal part at the bottom of the case will be very small. As a result, damage due to bearing wear is reduced, and seizure damage to gears and bearings due to oil outflow due to oil seal damage can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a vertical turning reduction gear according to a first example of the first means of the present invention.

FIG. 2 is a sectional view of a second example of the first means.

FIG. 3 is a cross-sectional view of the main part of a vertical turning reduction gear according to a first example of the second means of the present invention.

FIG. 4 is a sectional view according to a second example of the second means.

FIG. 5 is a cross-sectional view of a vertical planetary gear type swing reduction gear according to a conventional structure.

[Explanation of symbols]

1 Output shaft 7 Oil seal 2,3 Bearing 10 Swing motor 4 Case 11 Ring gear 5 Spacer 12 Upper swivel body 6,8,9 Receiving tray

Claims (2)

[Scope of utility model registration request] 1. A vertical planetary gear type slewing reducer for reducing the rotation of a swing motor attached to an upper part and transmitting the rotation to an output shaft of a lower part, on an output shaft between two bearings supporting the output shaft. A turning speed reducer having a structure in which a tray for wear powder having a concave upper surface is fitted. 2. Instead of the saucer fitted on the output shaft in claim 1, a saucer having a concave upper surface is fitted on the inner surface of the case between the two bearings, or a saucer is formed on the inner surface of the case. A turning speed reducer characterized by being formed.