JPH09203079A - Swivel for construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] In a construction machine having an upper swing structure installed on a lower traveling structure via a swing device, a truck frame box having a simple structure and without affecting other components. Allow larger shapes. [Structure] The mounting seat 45 for fixing the inner ring 40 of the slewing wheel 39 has a predetermined tightening allowance and has sufficient strength when the bolt 46 for fixing the inner ring 40 is screwed. With the required thickness dimension, it is connected to the outer peripheral side of the annular upper plate 36a of the main body portion 36 of the track frame 35 and fixed by welding means, whereby the dimension of the main body portion 36 in the height direction of the box. Can be increased, and the strength can be improved. Also, the box of the beam 37 connected to the side plate 36c on the outer peripheral side of the main body portion 36 can be made large, the strength of the entire track frame 35 is improved, and the height position of the lower surface portion from the ground is increased, The minimum ground clearance can be increased.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hydraulic shovel or the like,
The present invention relates to a revolving device for revolving an upper revolving structure in a construction machine configured to rotatably connect an upper revolving structure on a lower traveling structure.

[0002]

2. Description of the Related Art An example of a construction machine is a hydraulic excavator shown in FIG. In the figure, 1 is a lower traveling body,
2 is an upper swing body. The undercarriage 1 has left and right crawler belts 3, 3, and each of these crawler belts 3 has a drive tumbler 4
And the idler 5 are wound around, and the drive tumbler 4 and the idler 5 are mounted on the side frame 6
It is connected to. Then, as shown in FIG. 6, the left and right side frames 6 are connected to the track frame 7. The track frame 7 is a body portion 7 formed in an annular shape.
a and four beams 7b extending from the outer peripheral surface of the main body portion 7a. These four beams 7b are connected to each side frame 6 at two places respectively, and bolts 8 are used. It is fixed to the side frame 6. The track frame 7 is provided with a revolving device 9, and the upper revolving structure 2 is rotatably connected to the lower traveling structure 1 by the revolving device 9. As a result, the upper swing body 1
Front working mechanism 10 including, for example, a bucket as a boom, an arm, and a front attachment provided in the
And the operator boarded and operated the hydraulic excavator,
The operator cab 11 for performing work such as excavation of earth and sand can be oriented in a desired direction.

In the above structure, the turning device 9 is shown in FIG.
It is constructed as shown in. As is clear from the figure,
The track frame 7 of the undercarriage 1 is provided with a mounting seat 12 formed of a ring body formed in an annular shape, fixed to the mounting frame 12 by means such as welding.
The inner ring 13 constituting the is fixed by bolts 14. On the other hand, the outer ring 15 is the swing frame 16 of the upper swing body 2.
Is hung vertically on the lower surface of the outer ring 15, and a bolt 17 is attached from the lower surface side of the outer ring 15 so that the bolt 17 is attached to the revolving frame 1.
It is fixed by being screwed into 6. Inner ring 13 and outer ring 1
By interposing the bearing 18 between the inner ring 13 and the outer ring 5, the inner ring 13 and the outer ring 15 constitute a slewing wheel that is relatively rotatable. Inner teeth 13 a are formed on the inner surface side of the inner ring 13, and the revolving frame 16 of the upper revolving structure 2 is provided.
A turning motor 19 is fixedly provided in the shaft, and an output shaft 19a of the turning motor 19 extends downward from an opening 16a provided in the turning frame 16. The turning pinion 20 is connected to the output shaft 19a, and the turning pinion 20 meshes with the inner teeth 13a of the inner ring 13.

A bottom plate 21 is provided on the inner surface side of the mounting seat 12 in order to lubricate the meshing portion between the turning pinion 20 and the inner teeth 13a.
And a standing wall 22 is erected on the inner peripheral side end of the bottom plate 21. Therefore, an annular chamber is formed by the bottom plate 21, the standing wall 22, and the surface on which the inner teeth 13a of the inner ring 13 are formed, and by supplying grease into the chamber, a meshing portion of the inner teeth 13a and the pinion 20 is formed. A grease bath 23 for lubrication is formed.

[0005]

By the way, the main body portion 7a
The track frame 7 including the beam 7b and the beam 7b receives the entire weight of the upper swing body 2. In order to make the track frame 7 lightweight and have necessary strength,
The cross-sectional shape is made by assembling a steel plate into a box shape consisting of a lower plate, an upper plate and left and right side plates by means such as welding. That is, the main body 7a is an annular hollow beam, and the beam 7b
Consists of a hollow beam extending from its outer peripheral surface. here,
In the box structure, the larger the size of this box, the better the structural strength,
In particular, in order to support the load from above, like the upper revolving superstructure 2, the size of the box in the height direction may be increased.
Therefore, to improve the strength of the track frame 7,
The size and shape of the box forming the main body 7a and its beam 7b, especially the size in the height direction, must be increased.

For this purpose, it is considered that the track frame 7 is first raised to the upper side. However, since the turning device 9 is provided on the main body portion 7a of the track frame 7 and the upper turning body 2 is further installed on the turning device 9, the height of the entire vehicle is increased by the increased size. Become. When the vehicle height becomes high, the hydraulic excavator is transferred from the work site to another work site or the like, so that there is a possibility that the vehicle height limit under the road traffic regulations cannot be satisfied when the hydraulic excavator is placed on the trailer. On the other hand, even if the main body 7a and its beam 7b are extended downward, the configuration of the box itself can be increased. However, in this case, the minimum ground clearance becomes low, and even if there is a small protrusion on the ground while the vehicle is traveling, the traveling condition of the vehicle is significantly deteriorated, such as the truck frame 7 colliding. Therefore, the track frame 7
It is not possible to extend the box below.

The present invention has been made in view of the above points, and it is an object of the present invention to increase the box shape of a track frame with a simple structure without affecting other components. To do so.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a track frame of an undercarriage is provided with an annular box-shaped main body and an extension from the main body. , A beam connected to the side frame, and a mounting seat for fixing the inner ring of the slewing wheel connected to the upper plate of the main body. The mounting seat is screwed with a bolt for fixing the inner ring. The feature is that the structure has a minimum required dimension in the thickness direction for forming the screw hole.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A track frame is composed of a cylindrical hollow beam-shaped main body on which a slewing wheel is installed, and a beam extending from the main body. The rings are connected and the beam is the connection to the side frame in the track frame. First, in order to improve the strength of the track frame, the box of the main body is enlarged. The inner ring that constitutes the slewing wheel is fixed to a mounting seat provided on the track frame with a bolt, and the mounting seat is integrated with an upper plate of the main body of the track frame. As a result, the main body can be arranged at a position substantially separated from the swivel frame of the upper swing body by the height dimension of the swivel wheel, and the size of the box of the main body in the height direction can be increased.

Since the inner ring forming the turning wheel is fixed to the mounting seat, the plate member forming the mounting seat has a thickness enough to provide at least a screw hole for fixing the bolt. Must be However, in the above-described mounting seat in the conventional technology, not only is a screw hole of a predetermined depth formed, but in addition to that, a spacer is provided to provide a space equal to or longer than the length of the bolt for fixing the outer ring. It's working. For this reason, the height of the mounting seat becomes extremely high. That is, the outer ring has a bolt inserted from the lower side to fix the bolt to the revolving frame. In order to fix the bolt, a space longer than the entire length of the bolt is provided below the outer ring. . However, in the present invention, the mounting seat does not have a function as a spacer, and the height dimension of the mounting seat is reduced by limiting the thickness dimension to provide the screw hole necessary for fixing the inner ring with the bolt. . As a result, the dimension in the height direction of the box of the main body of the truck frame can be increased without affecting the minimum ground clearance or the vehicle height.

The work of fastening the outer ring to the revolving frame with bolts is performed from below. The main body, which has the mounting seats integrated, is located at a position where it does not interfere with the bolt mounting part of the outer ring, so even if the height of the main body is increased, the work to secure the bolt It does not cause any trouble. However, the beam extends through the lower part of the outer ring to the side frame. Therefore, if the height of the beam is increased, the beam interferes and the bolt cannot be mounted.

By the way, the beam extends from the main body portion at four places, but there is a space in the lower portion of the portion between the connecting portions of each beam to the main body portion. Therefore, if the space formed below the portion between the connecting portions of the respective beams to the main body portion is used, the beams do not become an obstacle when the bolts are mounted. For this reason, a space is secured at a portion between the beams or at a front portion and a rear portion between the beams so that at least one bolt can be fixed to the revolving frame via the outer ring. When the upper revolving structure is installed on the revolving wheel, it is pressed against the outer ring due to its own weight. If the bolt is fixed at least at one place, the upper revolving structure can be revolved. Moreover, when the upper revolving structure is turned, the outer ring also follows and rotates, so that the portion of the outer ring located in the space where the bolt can be fastened changes. Therefore, the bolts can be fixed over the entire circumference by sequentially fixing the bolts while rotating the upper revolving structure by a required angle.

[0013] In short, it is not necessary in the prior art to provide a space equal to or longer than the length of the bolt for fixing the outer ring between the upper surface of the beam and the lower surface of the outer ring, which is required in the prior art. In some cases it is not mandatory. Therefore, there is no need to restrict the height of the beam, and the size of the beam box can be expanded in the height direction as well as the main body forming the track frame.

In this way, by enlarging the size of the box of the entire track frame in the height direction, its strength is remarkably improved. Further, it is possible to position the lower surface of the track frame upward, and thus it is possible to raise the minimum ground clearance. Further, when the upper surface of the main body of the track frame is raised to be substantially at the same height as the mounting seat, the upper surface of this main body can be used as the bottom surface of the grease bath. Therefore, if the annular standing wall is fixedly provided inside the inner ring on the upper surface of the main body, the grease bath can be formed only by that, and the configuration of the grease bath is simplified.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show the first embodiment of the present invention, and FIG. 4 shows the second embodiment.

First, in the first embodiment, as is apparent from FIGS. 1 and 2, the turning device 30 includes the lower traveling body 31.
The lower traveling body 31 has left and right side frames 33, and a drive tumbler and an idler are connected to the side frames 33, although not shown. A crawler belt 34 is wound around the drive tumbler and the idler. The left and right side frames 33 are connected to the track frame 35. The track frame 35 is
As is clear from FIG. 3, it is composed of a box-shaped annular main body 36 and four beams 37 extending from the main body 36. Each side frame 33 has two beams 37. The beam 37 is connected by bolts 38. The above configuration is not particularly different from the above-described prior art.

In FIG. 1, reference numeral 39 denotes a slewing wheel. The slewing wheel 39 includes an inner ring 40, an outer ring 41, and the inner ring 4 thereof.
0, a bearing 42 interposed between the outer ring 41, and the inner ring 40 of the inner ring 40 has a turning inner tooth 40a.
Are formed. A swivel pinion 44 connected to an output shaft 43a of a swivel motor 43 mounted on the swivel frame 32 is meshed with the inner teeth 40a. Therefore, when the swivel pinion 44 is rotated, the swivel frame 32 moves horizontally. Rotate to. Then, the inner ring 40 of the turning wheel 39
Is fastened to the mounting seat 45 with bolts 46, and the outer ring 41 is attached to the lower surface of the swing frame 47 of the upper swing body 32 with bolts 48.
It is fixed by.

Here, the mounting seat 45 is the track frame 3
5 constitutes a part of the main body portion 36. That is, the main body portion 36 has a box shape, and has an annular upper plate 36a formed of a steel plate, side plates 36b and 36c provided on the inner and outer peripheral sides of the upper plate 36a, and a lower plate 36d.
It is composed of A bolt 46 for fixing the inner ring 40 is screwed into the mounting seat 45. The mounting seat 45 is an annular steel plate that is thicker than the upper plate 36a in order to have a predetermined tightening allowance and sufficient strength. It is formed. The mounting seat 45 is connected to the outer peripheral side of the upper plate 36a, abuts against the upper plate 36a and is welded to the outer peripheral side plate 3.
It is welded to the upper surface of 6c. Further, the beam 37 constituting the track frame 35 is fixed to the side plate 36c on the outer peripheral side of the main body portion 36 by welding means, and the beam 37 also has a box shape.

Further, the turning inner teeth 40 of the inner ring 40
The upper plate 3 of the main body 36 of the track frame 35 in order to lubricate the meshing portion between the a and the turning pinion 44.
An annular standing wall 49 is provided at a position inside the inner ring 40 of 6a.
Are fixedly provided by welding means. Therefore, the grease bath 50 is formed by the inner ring 40, the standing wall 49 and the upper plate 36a.

The present embodiment is constructed as described above, and it is necessary for the mounting seat 45 to have a necessary tightening margin for securely fixing the inner ring 40, and The mounting seat 45 has only a thickness dimension required to form a screw hole having a minimum required depth, and the mounting seat 45 is arranged at substantially the same position as the upper plate 36a of the main body 36 of the track frame 35. Therefore, the upper plate of the main body 36 is compared with the mounting seat of the prior art which also functions as a spacer that makes the distance between the outer ring and the upper plate more than the length dimension of the bolt. Since the size of the box can be increased by increasing the position of 36a, especially the size in the height direction, the strength of the upper revolving structure 32 in the vertical direction on which the weight acts is significantly improved.

Further, the turning internal teeth 40 formed on the inner ring 40
The grease bath 50 is provided in order to lubricate the meshing portion between the a and the turning pinion 44 to enable smooth turning, but the inner ring 40 is fixed to the upper plate 36a of the main body 36 of the track frame 35. The upper surface 36a is shared by the bottom wall of the grease bath 50 by being raised to a position almost the same as the height of the mounting seat 45 to be installed. Therefore, the configuration of the grease bath 50 can be simplified. .

By the way, the slewing wheel 39 is mounted on the lower traveling body 31.
In connecting the upper revolving structure 32 via the, the revolving wheel 39 is first installed on the track frame 35 of the lower traveling structure 31, and its inner ring 40 is fixed by fixing it to the mounting seat 45 with the bolt 46. It Here, the turning wheel 39 is fixed to the lower traveling body 31 before the upper turning body 32 is mounted, so that the bolt 46 can be easily fixed. When the slewing wheel 39 is fixed to the lower traveling body 31, the upper slewing body 32 is placed on the slewing wheel 39, and the upper slewing body 32 is fixed.

The outer ring 41 of the revolving wheel 39 is fixed to the revolving frame 47 of the upper revolving structure 32 with bolts 48. Moreover, the bolt 48 is fastened by screwing the bolt 48 into the revolving frame 47 by inserting the bolt 48 from below the outer ring 41. Therefore, a space below the outer ring 41 for inserting the bolt 48 is required. However, it is not necessary to have such a space above the beam 37. Where the four beams 37
The areas of the connecting portions to the main body portion 36 are each smaller than 90 °, as is apparent from FIG. Therefore, there is a predetermined space below the portion between the adjacent beams 37, 37, and at the portion located in this space, one or a plurality of bolts 48 can be fixed without the beam 37 being an obstacle. It becomes a state. Therefore, with the upper revolving structure 32 installed on the revolving wheel 39, first, one or several bolts 48 are fastened to each of the four spaces. As a result, the outer ring 41 and the upper revolving structure 32 are temporarily connected.

A swinging motor 43 is mounted on the upper swinging body 32, and a swinging pinion 44 is connected to an output shaft 43a of the swinging motor 43.
Is engaged with the turning internal teeth 40a of the inner ring 40, the turning motor 43 is operated, and the upper turning body 32 is turned by a predetermined angle. During this turn, the outer ring 41 is also interlocked with the inner ring 40.
Will rotate around, and in the space mentioned above,
The unattached portion of the bolt 48 faces. In this state, the turning is stopped, the bolts 48 are fastened, and this work is repeated sequentially, so that the bolts 48 can be fastened all around the outer ring 41.

As described above, since the beam 37 does not get in the way when the bolt 48 is fixed, the beam 37 can be formed into an arbitrary shape.
Since the size of the outer side plate 36c connected and fixed to the side plate 36c in the height direction is large, the size of the box of the beam 37 connected and fixed to the side plate 36c can also be increased in the height direction. . Therefore, the strength of the entire track frame 35 can be significantly improved.

Therefore, FIG. 4 shows a structure configured to improve the beam intensity. In the figure, the same or equivalent members as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

The beam 62 extending from the main body portion 61 constituting the track frame 60 has a box shape, and the upper plate 62a thereof is continuously raised as it goes to the main body portion 61. It is in a tilted state. The tip of the upper plate 62a is integrally provided with the main body 61, is joined to a mounting seat 45 to which the inner ring 40 is fixed, and is fixed by welding means. Of course, the upper plate 62a
Is inclined, the upper ends of the side plates 62b and 62c also have an inclined shape corresponding thereto. However,
The lower plate 62d extends substantially horizontally.

With this structure, the box of the beam 62 becomes larger and the strength thereof is also improved. The size of the box of the main body 61 and the size of the box of the main body 61 are increased, and the strength of the track frame 60 as a whole is remarkably improved. To do. Particularly, by fixing the upper plate 62a of the beam 62 to the thick mounting seat 45, the fixing strength is also improved. Therefore, even if the number of devices installed in the upper-part turning body 32 is increased or the capacity of the bucket in the front working mechanism is increased, the load can be sufficiently borne.

Further, the minimum ground clearance can be increased together with or instead of improving the strength of the track frame 60. In order to increase the minimum ground clearance, the main body 61 and the beam 62 which form the track frame 60 are formed.
Raise the lower surface of. As a result, even if there is a protrusion or the like from the ground at the work site where the vehicle is traveling, the possibility that the track frame 60 will collide with such a protrusion is reduced, and smooth traveling is possible.

[0030]

As described above, the present invention is required to form a screw hole into which a bolt for fixing the inner ring of the turning wheel is screwed, in the upper plate portion of the main body portion of the truck frame of the lower traveling body. Since the mounting seats having the minimum dimension in the thickness direction are connected and provided, it is possible to increase the box shape of the track frame with a simple structure without affecting other structural members.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a configuration of a turning device in a first embodiment of the present invention.

FIG. 2 is a front view of a hydraulic excavator as an example of a construction machine equipped with the turning device of FIG.

FIG. 3 is a plan view of a turning device.

FIG. 4 is a sectional view of an essential part of a turning device showing a second embodiment of the present invention.

FIG. 5 is a side view of a hydraulic excavator provided with a turning device.

FIG. 6 is a sectional view of a main part of a swivel device according to a conventional technique.

[Explanation of symbols]

 30 Swivel Device 31 Lower Traveling Body 32 Upper Slewing Body 33 Side Frame 35,60 Track Frame 36,61 Main Body 37,62 Beam 39 Slewing Wheel 40 Inner Ring 41 Outer Ring 45 Mounting Seat 46,48 Bolt 47 Slewing Frame 49 Standing Wall 50 Grease Bath

Claims (3)

[Claims] 1. An upper revolving structure is rotatably installed on a lower traveling structure via a revolving wheel, and of the inner and outer wheels forming the revolving wheel, the lower traveling structure has inner teeth formed on its inner peripheral surface. An inner ring is fixed to the inner ring with a bolt, and an outer ring connected to the inner ring is rotatably connected to the upper ring. In the construction machine adapted to be meshed with, the inner tooth frame of the lower traveling body includes an annular box-shaped main body portion and a beam extending from the main body portion and connected to the side frame. A mounting seat for fixing the inner ring of the slewing wheel is connected to the upper plate of the main body, and the mounting seat has a minimum thickness necessary to form a screw hole into which the bolt is screwed. The feature is that it has a dimension in the direction. A turning device for construction machinery. 2. A beam connected to a side frame of the lower traveling body is provided on the main body so as to extend, and the beam has a box shape, and an upper ring of an outer ring fixed to the upper revolving superstructure of the box is provided. The turning device for a construction machine according to claim 1, wherein a distance from the lower surface is set to be shorter than a length dimension of a bolt for fixing the outer ring. 3. An upper wall portion of the track frame further has an annular standing wall fixedly provided inside the inner ring, and a grease bath is formed between the standing wall and the inner ring. The swivel device for a construction machine according to claim 1, which is characterized in that.