JPH07189291A - Turning device of work machine - Google Patents

Abstract

PURPOSE:To make it possible to form a solid weld of a base plate which constitutes a grease bath and repair easily damages, such as cracks generated in the weld. CONSTITUTION:A ring-shaped offset portion 33 is formed on the inner periphery side of a round shell 22 where a ringshaped outside plate 35 is welded with and mounted to the ring-shaped offset portion 33. An inner side plate 36, which is in outside diameter-dimensions smaller than the inside diameter dimensions of an internal gear 16 of an inner wheel 11, is removably mounted with screws 38 or the like in such a fashion that a large sized-hole of the outer side plate 35 may be closed, thereby preventing the generation of a sap which may produce grease leakage between the outer side plate 35 and the round shell 32. During assembling time and repairing time, the outside plate 35 on the ring-shaped offset portion 33 may be welded from both upper and lower surfaces by way of the large sized hole 35. The outside plate 35 can be formed solidly on the round shell 35. In addition, it is possible to separate the inner side plate 36 from a track frame 7 by removing the screw 38. It is also possible to repair easily cracks or the like generated in a grease bath 40.

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 a working machine which is preferably used for a swing type working machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art FIGS. 4 to 7 show a hydraulic excavator as a working machine having a turning device according to the prior art.

In the figure, 1 is a lower traveling body, 2 is an upper revolving body mounted on the lower traveling body 1 so as to be rotatable, and the upper revolving body 2 is a revolving frame 3 and on the revolving frame 3. It comprises a driver's cab 4, a machine room 5, and a counterweight (not shown) provided at the rear of the machine room 5 and the like. Although not shown in FIG. 4, a work device such as a boom, an arm and a bucket is attached to the front side of the upper swing body 2.

Reference numeral 6 denotes a revolving device provided between the revolving frame 3 and the track frame 7 constituting the lower traveling body 1. The revolving device 6 is, as shown in FIG. The speed reducer 17 and the grease bath 21 are generally included.

Reference numeral 8 denotes a cylindrical round cylinder located in the center of the track frame 7 and forming a part of the track frame 7. The round cylinder 8 has a plurality of screw holes 8A (only one is shown at the upper end). ) Is formed, and the slewing wheel 10 is fixed to the screw hole 8A via a bolt 9. Here, the slewing wheel 10 is composed of an inner ring 11, an outer ring 12, a steel ball 13 and the like which will be described later.

Reference numeral 11 denotes an inner ring which constitutes the swivel wheel 10. The inner ring 11 is formed as an annular ring, and a plurality of bolts which are circumferentially spaced from each other and penetrate from the upper end side to the lower end side are inserted into the inner ring 11. A hole 11A (only one is shown) is formed. Then, the inner ring 11 is fixed to the upper end of the round barrel 8 by tightening the bolts 9 in the respective bolt insertion holes 11A. A recess 11B having a semicircular cross section is formed on the outer peripheral surface of the inner ring 11.

Reference numeral 12 denotes an outer ring which constitutes the swivel wheel 10. The outer ring 12 is formed as an annular ring having a diameter dimension that can be fitted to the outer peripheral side of the inner ring 11, and bolt insertions similar to the inner ring 11 are inserted. Holes 12A, 12A, ...
(Only one is shown) are formed. Also, the outer ring 12
A recess 12B having a semicircular cross-section is formed on the inner peripheral side of each of the plurality of steel balls 13, 13, ... (Only one is shown) between the recess 12B and the recess 11B of the inner ring 11. Has been done.

The steel balls 13 are composed of an inner ring 11 and an outer ring 1.
By rolling between the inner ring 11 and the outer ring 12, the inner ring 11 and the outer ring 12 can smoothly rotate relative to each other. Further, the outer ring 12 is inserted into the bolt insertion holes 12A with bolts 15 through washers 14, and the bolts 15 are fastened to the screw holes 3A provided in the revolving frame 3, whereby the revolving wheel 1
The outer ring 12 side of No. 0 is fixed to the revolving frame 3.

Reference numeral 16 denotes an internal gear that is integrally formed on the inner peripheral side of the inner ring 11, and the internal gear 16 is a pinion 1 to be described later.
The swivel wheel 10 is swung by meshing with 8 and rotating.

Reference numeral 17 denotes a speed reducer provided on the side of the upper revolving structure 2, a hydraulic motor (not shown) is provided on the upper end side of the speed reducer 17, and the internal portion is provided on the lower end side of the speed reducer 17. A pinion 18 that meshes with the toothed gear 16 is provided. Then, the speed reducer 17 decelerates the rotation of the turning motor and transmits it to the pinion 18, and the pinion 18 meshes with the internal gear 16 fixed to the round barrel 8 to rotate, thereby turning on the track frame 7. Rotate the frame 3.

Reference numeral 19 denotes a bottom plate, which is made of an annular thin plate, and the bottom plate 19 is provided on the outer peripheral side of the bottom plate 19 and the round barrel 8.
It is attached by forming a welded portion 19A between the inner peripheral side and the inner peripheral side. The bottom plate 19 forms a grease bath 21 with the inner ring 11 of the turning wheel 10 together with a tubular member 20 described later.

Reference numeral 20 denotes a cylindrical member fixed to the inner peripheral side of the bottom plate 19, and the cylindrical member 20 extends upward from the center side of the bottom plate 19 and projects to the same height as the inner ring 11. As a result, a concave annular grease bath 21 is formed between the bottom plate 19 and the inner ring 11. And
Grease 22 is stored in the grease bath 21 so that the internal gear 16 and the pinion 18 are lubricated.

The hydraulic excavator according to the prior art has the above-mentioned structure. When the upper revolving structure 2 is revolved, the revolving motor is rotationally driven, and this rotation is decelerated by the speed reducer 17 and transmitted to the pinion 18. And the pinion 1
By rotating in a state of being meshed with the internal gear 16 of the inner ring 11 fixed to the round body 8, 8 rotates around the inner circumference of the inner ring 11 while revolving. As a result, the upper-part turning body 2 turns around the lower-part traveling body 1.

When the swivel device 6 is disassembled in order to repair the grease bath 21 and the like, for example, after removing the bolts 15 fastening the outer ring 12 of the swivel wheel 10 to the swivel frame 3, As shown in FIG. 4, the upper swing body 2
As shown in FIG. 6, the wires 23, 23 are hung on the pin and the crane is lifted in the direction of arrow A by a crane or the like.
Is removed from the internal gear 16 of the inner ring 11, and the inside of the grease bath 21 is cleaned and the welded portion 19A and the like are repaired.

[0015]

By the way, in the above-mentioned prior art, since the outer peripheral side of the bottom plate 19 is welded and fixed to the inner peripheral side of the round barrel 8, the outer diameter of the bottom plate 19 is set to the round barrel. It is necessary to form it smaller than the inner diameter dimension of 8, and a root gap G is necessarily formed between the bottom plate 19 and the round barrel 8 as shown in FIG. However, since the bottom plate 19 constituting the grease bath 21 is made of a thin plate, it is difficult to completely close the root gap G with the welded portion 19A, and vibration due to running or working of the hydraulic excavator is also caused. There is a problem that cracks are easily generated in the welded portion 19A of the bottom plate 19 and the round barrel 8 and the grease 22 leaks from the grease bath 21.

Further, a lower plate 7A of the track frame 7 is provided below the bottom plate 19, and since the distance between the lower plate 7A and the bottom plate 19 is narrow, the bottom plate 7 is provided between the round cylinder 8 and the bottom plate 19. 19
There is a problem that the welded portion 19A can be formed only on the upper side of the base plate, and the welded portion can be formed on the upper and lower sides of the bottom plate 19 to improve the strength.

Further, since the distance between the lower plate 7A of the track frame 7 and the bottom plate 19 is narrow, there is a problem that it is difficult to repair when the grease bath 21 is damaged such as cracks.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can firmly form a welded portion of a bottom plate and can easily repair even if damage such as cracks occurs in the welded portion. It is an object of the present invention to provide a swivel device for a working machine capable of

[0019]

In order to solve the above problems, a swivel device for a working machine according to the present invention comprises a round cylinder provided on a track frame of the working machine and a swivel frame for the working machine on the round cylinder. In order to rotatably support the inner ring side, the inner ring side is fixed to the round cylinder, the outer ring side is fixed to the revolving frame, and has a pinion that meshes with an internal gear formed on the inner ring side of the revolving wheel. It is composed of a speed reducer that reduces the rotation of the swing motor and transmits it to the pinion, and a bottom plate that is provided on the round cylinder and forms a grease bath with the inner ring of the swing wheel.

The features of the configuration adopted by the present invention are:
The bottom plate is composed of an annular outer plate portion whose outer peripheral side is fixed to the inner peripheral surface side of the round barrel, and an inner plate portion located inside the outer plate portion and detachably attached to the outer plate portion. Especially.

[0021] Here, it is preferable to form an annular step portion on the inner peripheral side of the round cylinder, to which the outer peripheral side of the outer plate portion is welded.

The outer diameter of the inner plate portion is preferably smaller than the inner diameter of the internal gear formed on the inner ring side of the turning wheel.

[0023]

With the above structure, since the bottom plate forming the grease bath is composed of the outer side plate and the inner side plate, the weight of the outer side plate can be reduced and the thick plate can be used to firmly form the outer side plate. You can Further, since a large hole can be formed on the inner peripheral side of the outer plate portion, the outer plate portion can be welded to the inner peripheral side of the round barrel from both the upper and lower surfaces through the hole, and the outer plate portion can be welded. It can be firmly attached to the round body, and the labor of repair can be reduced.

An annular step portion is formed on the inner peripheral side of the round cylinder,
If the outer peripheral side of the outer plate portion is welded to the annular step portion, the outer plate portion can be easily welded to the inner side of the round cylinder even if the outer diameter dimension of the outer plate portion and the inner diameter dimension of the round barrel differ to some extent. It is possible to prevent the formation of a gap that causes grease leakage.

Further, if the outer diameter of the inner plate portion is formed to be smaller than the inner diameter of the internal gear formed on the inner ring side of the slewing wheel, the inner plate portion of the bottom plate can be left with the inner ring attached to the cylinder. Can be removed to the top.

[0026]

Embodiments of the present invention will be described in detail below with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a swivel device according to this embodiment, and the swivel device 31 includes a round barrel 32, a grease bath 40, and the like, which will be described later, almost like the swivel device 6 according to the prior art. .

Reference numeral 32 denotes a round cylinder used in the present embodiment. The round cylinder 32 has a plurality of screw holes 32A (only one is shown) formed at the upper end, substantially like the round cylinder 8 described in the prior art. Although formed into a cylindrical shape, an annular step portion 33 is concentrically formed on the inner peripheral side of the round barrel 32 so that the lower side has a predetermined depth from the upper end and the lower side has a small diameter.

Reference numeral 34 denotes a bottom plate provided on the round barrel 32, and the bottom plate 34 is an outer plate portion 35 and an inner plate portion 36 which will be described later.
It is composed of and.

Reference numeral 35 denotes an outer side plate portion, which is formed of an annular plate material having a large diameter hole 35A (see FIG. 3) in the center, and the outer peripheral side of the upper surface of the outer side plate portion 35 is the round barrel 32. It is fixed by forming a welded portion 35B on the annular stepped portion 33. The lower surface side of the outer side plate portion 35 is fixed to the round barrel 32 by forming a welded portion 35C between the outer side plate portion 35 and the annular step portion 33.

Reference numeral 36 denotes an inner plate portion, and the inner plate portion 36 is formed by an annular thin plate, and the outer diameter dimension D of the inner plate portion 36.
As shown in FIG. 2, 1 is formed with a diameter smaller than the inner diameter dimension D2 of the internal gear 16 of the inner ring 11. The outer peripheral side of the inner side plate portion 36 is superposed on the inner peripheral portion of the outer side plate portion 35 via an annular seal member 37 that prevents grease from leaking, and a plurality of screws 38 (only one is shown). It is detachably fixed.

Reference numeral 39 denotes a tubular member fixed to the inner peripheral side of the inner plate portion 36. The tubular member 39 is substantially the same as the tubular member 20 described in the prior art, and the central portion of the inner plate portion 36. A concave annular grease bath 40 is formed between the inner ring 11 and the bottom plate 34 by extending upward from the side and protruding to almost the same height as the inner ring 11.

The turning device 31 according to the present embodiment has the above-described structure, and its basic operation is not particularly different from that according to the prior art.

However, in this embodiment, the annular step portion 33 is formed on the inner peripheral side of the round barrel 32, and the bottom plate 34 is formed on the annular step portion 33.
Since the annular outer plate portion 35 constituting the outer peripheral portion is welded and attached on the outer peripheral side, even if there is a dimensional error between the outer diameter dimension of the outer plate portion 35 and the inner diameter dimension of the round cylinder, for example, the outer peripheral side of the outer plate portion 35. Can be welded in contact with the annular stepped portion 33 of the round barrel 32, and it is possible to reliably prevent the formation of a gap that leaks the grease 22 like the root gap G shown in FIG.

The outer plate portion 35 has a large diameter hole 35A in the center.
Since it is formed, the weight can be reduced, and the plate can be firmly formed using a thick plate. Further, at the time of assembling and repairing, the annular step portion 3 is inserted through the large diameter hole 35A.
3 can be welded to the outer side plate portion 35 on both upper and lower sides, the outer side plate portion 35 can be firmly attached to the round barrel 32, and the time and effort for repair can be greatly reduced. .

Since the outer diameter D1 of the inner plate portion 36 is smaller than the inner diameter D2 of the internal gear 16 formed on the inner ring 11 side of the slewing wheel 10, as shown in FIG. 38 is pulled out, and the inner plate portion 36 is indicated by an arrow A.
The inner plate portion 36 can be separated from the track frame 7 together with the tubular member 39 with the slewing wheel 10 attached to the round body 32 only by lifting in the direction. For example, a crack or the like occurs at the welding portion of the grease bath 40. Even in the case, the repair can be easily performed.

Although the hydraulic excavator has been described as an example of the working machine in the above-described embodiment, the present invention is not limited to this, and the working machine may be used in a turning device of another working machine such as a hydraulic crane. Good.

[0038]

As described above in detail, according to the present invention, the bottom plate forming the grease bath with the inner ring of the slewing wheel is the annular outer plate having the outer peripheral side fixed to the inner peripheral surface side of the round cylinder. Department,
The weight of the outer plate portion can be reduced by being configured with the inner plate portion that is located inside the outer plate portion and is detachably attached to the outer plate portion, and the outer plate portion can be made strong by using a thick plate. It can be formed and can be welded from the upper and lower both sides between the outer plate portion and the round barrel through the hole of the outer plate portion, and the outer plate portion can be firmly attached to the round barrel, The time required for repair can be greatly reduced.

In this case, the outer diameter of the outer plate portion and the inner diameter of the round barrel are different to some extent by forming an annular step portion on the inner peripheral side of the round body, to which the outer peripheral side of the outer plate portion is welded. However, the outer plate portion can be easily welded to the inner peripheral side of the round cylinder, and it is possible to prevent the formation of a gap that causes grease leakage.

Further, by forming the outer diameter of the inner plate portion to have a smaller diameter than the inner diameter of the internal gear formed on the inner ring side of the slewing wheel, the inner plate of the bottom plate can be attached with the inner ring attached to the cylinder. The part can be removed from the track frame, greatly simplifying the repair work.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of essential parts showing a turning device of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which a pinion is disassembled from an inner ring of a turning wheel.

FIG. 3 is a vertical cross-sectional view showing a state in which an inner plate portion is disassembled from an outer plate portion of a bottom plate.

FIG. 4 is an external view of a conventional hydraulic excavator.

5 is a longitudinal sectional view of a main part of the swivel device as viewed in the direction of arrow VV in FIG.

6 is a longitudinal sectional view showing a state in which a pinion is disassembled from the inner ring of the turning wheel shown in FIG.

FIG. 7 is an enlarged cross-sectional view showing a welded portion of a round body and a bottom plate.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 3 Revolving Frame 7 Track Frame 7A Lower Plate 10 Revolving Wheel 11 Inner Ring 12 Outer Ring 16 Internal Gear 17 Reducer 18 Pinion 33 Annular Step 34 Bottom Plate 35 Outer Plate 35A Large Diameter Hole 35B, 35C Welding part 36 Inner plate part 40 Grease bath

Claims (3)

[Claims] 1. A circular cylinder provided on a track frame of a working machine, and an inner ring side fixed to the circular cylinder and an outer ring side fixed to the circular frame so as to rotatably support the swing frame of the working machine on the round cylinder. A slewing wheel that is fixed to the slewing wheel, and a pinion that has a pinion that meshes with an internal gear formed on the inner ring side of the slewing wheel, and a speed reducer that reduces the rotation of the slewing motor and transmits the rotation to the pinion,
In a revolving device for a working machine, comprising a bottom plate provided on the round cylinder and forming a grease bath with an inner ring of the revolving wheel, the bottom plate is an annular shape whose outer peripheral side is fixed to an inner peripheral surface side of the round cylinder. Of the outer plate part and an inner plate part that is located inside the outer plate part and is detachably attached to the outer plate part. 2. The swivel device for a working machine according to claim 1, wherein an annular step portion to which the outer peripheral side of the outer plate portion is welded is formed on the inner peripheral side of the round cylinder. 3. The working machine according to claim 1, wherein the outer diameter of the inner plate portion is smaller than the inner diameter of the internal gear formed on the inner ring side of the slewing wheel. Swivel device.