JPH04366234A - Slewing gear for construction equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing device for construction machinery suitable for use in swinging an upper rotating structure on a lower traveling structure of a construction machine.

0002

2 to 4 show a hydraulic excavator as an example of a construction machine equipped with a conventional swing device.

In the figure, 1 is an undercarriage, 2 is a swing device including a swing motor device 10, which will be described later.
The swinging device 2 rotatably supports an upper rotating structure 3 on the lower traveling structure 1, and the upper rotating structure 3 is provided with a driver's cab 4 and the like. Furthermore, a working device 5 having a bucket 5A at its tip is provided at the front of the upper revolving body 3.

The turning device 2 is shown in FIGS. 3 and 4.
It is configured as shown in . In the figure, reference numeral 6 denotes an inner ring having an internal gear 6A formed on its inner periphery, and the inner ring 6 is fixed to a cylinder 1A forming a part of a truck frame constituting the lower traveling body 1 with bolts 1B.

Reference numeral 7 denotes an outer ring rotatably fitted to the inner ring 6 via steel balls 8, and the outer ring 7 is fixed to the revolving frame 3A constituting the upper revolving body 3 with bolts 3B. The outer ring 7 constitutes a turning ring 9 together with the inner ring 6 and the steel balls 8.

Reference numeral 10 denotes a swing motor device as a swing drive mechanism for swinging the upper swing structure 3 with respect to the lower traveling structure 1, and the swing motor device 10 includes a swing motor section 11; It consists of a casing body 13A that is integrally fixed and fixed to the rotating frame 3A by bolts 12, and an annular cover 13B that is attached to the lower end of the casing body 13A, and has a reduction gear (not shown) built therein. Casing for reduction gear 1
3, and an output shaft 1 extending downward from the casing 13.
4, and a pinion 1 having an external gear 15A provided at the tip of the output shaft 14 and meshing with the internal gear 6A of the inner ring 6.
5 and the casing 13, an outer race 16A is fitted to the casing body 13A side, and an inner race 16B is fitted to the output shaft 14. The bearing 16 is generally configured to support the output shaft 14 between the outer race 16A and the casing 13. ing. In addition, in the embodiment, the casing body 1 of the casing 13 for a reduction gear
Although 3A is composed of two members, an upper and a lower part, it may be a single casing body.

The speed reduction device is provided inside the casing 13, and the rotation of the swing motor section 11 is slowed down by the speed reduction device and outputted from the output shaft 14. The outer race 16A of the bearing 16 is fixedly supported on the inner peripheral side of the casing body 13A and the cover 13B, and the cover 13B is fastened to the casing body 13A with bolts 17. Also,
As shown in FIG. 3, the external gear 15A of the pinion 15 has a tooth bottom diameter of D1 and a tooth tip diameter of D2 (D2>D1).

Reference numeral 18 denotes a spacer inserted between the inner race 16B of the bearing 16 and the pinion 15. The spacer 18 is formed in an annular shape, and the upper surface of the spacer An oil reservoir 18A is formed on the side, and an O-ring groove 18B, into which an O-ring 19 is mounted, is formed on the inner peripheral side in a concave annular shape. Further, a tapered portion 18D is formed in the spacer 18 on the side of the contact surface 18C with the pinion 15 and on the inner peripheral side.
Interference with rounded portions formed at the corners of the output shaft 14 is avoided, and the contact surface 18C of the spacer 18 and the pinion 15 are brought into close contact with each other. As a result, the spacer 18
The pinion 15 and the inner race 16B are positioned in the axial direction, and the outer circumferential surface 18E of the spacer 18 comes into sliding contact with a lip portion 22B of a seal member 22, which will be described later.

Reference numeral 20 denotes a grease bath for supplying grease 21 to the meshing part A between the internal gear 6A of the inner ring 6 and the external gear 15A of the pinion 15. It is provided in a concave ring shape on the inner peripheral side of the turning ring 9.

Reference numeral 22 denotes a seal member for preventing gear oil that lubricates the reduction gear and the like from leaking to the grease bath 20 side within the casing 13.
As a lip seal consisting of an annular support part 22A having an "L"-shaped cross section fixedly supported on the cover 13B side, and a bifurcated lip part 22B integrally provided on the distal end side of the annular support part 22. It is configured.

[0011]The sealing member 22 has a lip portion 2.
The oil sump 18A is press-fitted into the seal insertion step 13B1 of the cover 13B with the 2B facing inward, and the lip 22B comes into sliding contact with the outer peripheral surface 18E of the spacer 18.
The cover 13B fixed to the casing body 13A is integrated with the output shaft 14 to prevent gear oil from leaking to the grease bath 20 side, and to prevent dust, grease, etc. from entering the oil reservoir 18A. Rotating spacer 1
8 is sealed liquid-tightly.

Note that 23 is an oil level gauge provided in communication with the inside of the casing 13 in order to measure the level of gear oil.

The hydraulic excavator of the prior art is constructed as described above, and when the upper rotating structure 3 is to be rotated, the rotation motor section 11 is driven to rotate, and the rotation of the output shaft 14 is decelerated by the speed reduction device. The pinion 15 rotates while meshing with the internal gear 6A of the inner ring 6 fixed to the cylinder 1A, and rotates around the inner circumference of the inner ring 6. As a result, the casing 13, which is fixed to the revolving frame 3A and supports the output shaft 14 via the bearing 16, rotates together with the revolving frame 3A, thereby performing the revolving operation of the upper revolving body 3.

[0014]

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, the internal gear 6A of the inner ring 6 and the pinion 1
When these gears mesh with each other at the meshing part A with the external gear 15A of No. It may push open the lip portion 22B and enter the casing 13.

Here, the casing 13 is filled with gear oil for the reduction gear, and when the grease 21 enters the casing 13 side, this grease 21 mixes with the gear oil, contaminates the gear oil, changes the viscosity, etc. This causes deterioration of the properties and failure of the reduction gear, and there are also problems such as gear oil overflowing due to the intrusion of the grease 21 spouting out of the casing 13 from the gauge hole (not shown) of the oil level gauge 23.

The present invention has been made in view of the problems of the prior art described above, and provides a swing device for construction machinery that can prevent grease in a grease bath from entering the casing side. The purpose is to

[0017]

[Means for Solving the Problems] The features of the configuration adopted by the present invention in order to solve the above-mentioned problems are as follows:
A grease reservoir space is provided on the side of the contact surface with the pinion, which is larger than the diameter of the tooth bottom and smaller than the diameter of the tooth tip of the pinion, and temporarily stores the grease from the grease bath.

[0018]

[Operation] With the above configuration, the grease pushed upward from the meshing part between the internal gear on the inner ring side and the pinion is temporarily stored in the grease reservoir space of the spacer, and the grease is temporarily collected in the grease reservoir space of the spacer, and While lubricating the meshing part with the pinion, it is returned into the grease bath through this meshing part.

[0019]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In this embodiment, the same components as those in the prior art are denoted by the same reference numerals, and their explanations will be omitted.

In the figure, reference numeral 31 indicates a spacer used in this embodiment, and the spacer 31 is formed into an annular shape almost similar to the spacer 18 of the prior art, and has an oil reservoir 31A and an O-ring groove 31B. However, the spacer 31 of this embodiment is located on the contact surface 31C side with the pinion 15, and a grease reservoir space 31D surrounding the output shaft 14 is formed.

[0021] Here, the grease reservoir space 31D is
The inner peripheral side of the grease reservoir space 31D is hollowed out in the axial direction from the contact surface 31C side of the grease reservoir 31, and the peripheral wall surface 31E of the grease reservoir space 31D is larger than the root diameter D1 of the pinion 15 and larger than the tooth tip diameter D2. It is formed small. The spacer 31 is fitted between the inner race 16B of the bearing 16 and the pinion 15, and rotates together with the output shaft 14.

The swinging device for a hydraulic excavator according to this embodiment is constructed as described above, and its basic operation is not particularly different from that of the prior art.

In order to rotate the upper rotating body 3 relative to the lower traveling body 1, the rotating motor section 11 is rotationally driven, and the pinion 15 at the tip of the output shaft 14 is rotated by the external gear 15A.
When the internal gear 6A of the inner ring 6 is rotated in a meshed state, the grease 21 accumulated between the internal gear 6A and the external gear 15A flows upward at the meshing part A of the internal gear 6A and the external gear 15A. Being pushed up.

However, the pushed up grease 21 is
The flow flows into the grease reservoir space 31D of the spacer 31 from between the external gear 15A and the internal gear 6A of the pinion 15, and the flow in the radial direction flows into the peripheral wall surface 31 of the grease reservoir space 31D.
Since it is blocked by E, the lip portion 22B of the sealing member 22 can be pushed open to prevent the grease 21 from entering the casing 13 of the reduction gear.

When the rotation motor section 11 is stopped and the rotation of the output shaft 14 is stopped, the grease 21 remaining in the grease reservoir space 31D is removed from the external gear 15 of the pinion 15.
Grease bath 2 is supplied from grease reservoir space 31D while lubricating the tooth surfaces of both A and internal gear 6A through the gap between them.
Returned to within 0.

Therefore, according to this embodiment, the grease 21
It is possible to solve the problem that the oil enters the casing 13 side and contaminates the gear oil on the reduction gear side and deteriorates its properties, or that the gear oil overflows from inside the casing 13 and squirts out from the gauge hole of the oil level gauge 23.

Furthermore, the internal gear 6A of the inner ring 6 and the pinion 1
The grease 21 pushed upward by the meshing part A with the external gear 15A of No. 5 is temporarily stored in the grease reservoir space 31D and eventually returned to the grease bath 20.
It is possible to eliminate the grease 21 that accumulates on the upper side and does not contribute to lubrication, and the lubrication by the grease 21 can be performed effectively.

In the above embodiment, a hydraulic excavator was used as an example of the construction machine, but the construction machine is not limited to this, and any construction machine having a swing device, such as a hydraulic crane, can have the same effect as in the above embodiment. It can be effective.

[0029]

Effects of the Invention As detailed above, according to the present invention, the spacer is formed so as to be located on the side of the contact surface with the pinion and to be larger than the tooth bottom diameter and smaller than the tooth tip diameter of the pinion. is,
Since we have provided a grease storage space to temporarily store the grease from the grease bath, the output shaft is rotated and the internal gear and pinion in the inner ring mesh, and the grease is pushed upward from inside the grease bath. The grease can be temporarily stored in the grease reservoir space, and by reducing the force with which the grease is pushed up, it is possible to prevent the grease from entering the casing. Further, the grease once accumulated in the grease reservoir space can be returned to the grease bath through the meshing part between the internal gear of the inner ring and the pinion, so that the meshing part between the two can always be kept in a lubricated state. Therefore,
It is possible to eliminate the problem caused by the grease pushed up from the meshing portion entering into the casing, and it is also possible to effectively lubricate by utilizing the grease once pushed up.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an enlarged main part of a swing device according to an embodiment of the present invention.

FIG. 2 is an overall view showing a conventional hydraulic excavator.

FIG. 3 is an enlarged longitudinal sectional view of the turning device shown in FIG. 2;

FIG. 4 is an enlarged view of the main part in FIG. 3;

[Explanation of symbols]

1 Lower traveling body 2 Swivel device 3 Upper rotating body 6 Inner ring 6A Internal gear 9 Swing ring 10 Swing motor device (swing drive mechanism) 13 Casing 14 Output shaft 15 Pinion 16 Bearing 16B Inner race 20 Grease bath 21 Grease 31 Spacer 31D Grease reservoir space A meshing part

Claims (1)

[Claims] 1. A swing ring provided between a lower traveling body and an upper swing structure, and having an internal gear formed on the inner periphery of the inner ring side;
a swing drive mechanism that is attached to the upper revolving body and is integrally provided with a pinion that meshes with the internal gear on the tip side of the output shaft; and a grease bath provided on the lower traveling body side, and the swing drive mechanism includes a bearing that rotatably supports the output shaft within a casing, and an inner race of the bearing between the bearing and the pinion. A rotating device for construction machinery comprising a positioning annular spacer, wherein the spacer has a tooth tip that is located on the contact surface side with the pinion and is larger than the bottom diameter of the pinion. A turning device for construction machinery, characterized in that a grease reservoir space is formed to be smaller than the diameter of the grease bath and temporarily store grease from the grease bath.