JP2000291064A - Rotary construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a cut portion in a main frame of an upper rotary body to satisfy the limit of a transport width, and to prevent foreign matters from infiltrating from the outside. SOLUTION: An upper rotary body 6 arranged on a track frame 2 of a lower traveling body 1, is made up of a main frame 7 which is disposed at a central portion and frontward and rearward extends, and right and left bed frames which can be divided. The main frame 7 is provided with a rotary wheel mounting portion 7B at a location around a rotation center O, and the rotary wheel mounting portion 7B is provided with right and left cut portions 20, 20. By each cut portion 20, a lateral width W of the main frame 7 is made smaller than an external diameter D of an external wheel 25. The external wheel 25 of a rotary wheel 22 has a cover 37 attached thereto at a location corresponding to each cut portion 20, by means of a bolt 38 or the like, and each cover 37 has a seal member provided therefor, for sealing between each cut portion 20 of the main frame 7 and the cover 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine having a swing device such as a hydraulic shovel, and more particularly, to a swing type construction machine.
The present invention relates to a large-sized revolving construction machine in which an upper revolving superstructure is divided at the time of transportation and assembled at a work site.

[0002]

2. Description of the Related Art In general, a swing type construction machine such as a hydraulic shovel includes a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and an elevating and lowering mechanism which moves up and down on a front side of the upper revolving body. And a pivoting device for pivoting the upper revolving unit in an arbitrary direction with respect to the lower traveling unit between the lower traveling unit and the upper revolving unit. .

[0003] In this type of conventional rotary construction machine, for example, in the case of a large model, the upper revolving superstructure is divided into a central main frame and left and right bed frame sides, and is divided into three parts. The working device is provided on the side of the main frame, and a counterweight for balancing with the working device is provided on the rear end side of the main frame.

When a large construction machine is transported to a work site or the like, the upper revolving unit is divided into a central main frame and left and right bed frame sides in order to satisfy a limitation on a transport width and the like. After transporting them on separate trailers or the like in a divided state, the upper and lower revolving units are assembled on the lower traveling unit by connecting the left and right bed frame sides to the central main frame at the work site. I have.

[0005]

By the way, in the above-mentioned large-sized construction machine according to the prior art, since the turning wheel of the turning device is provided between the main frame of the upper turning body and the lower traveling body, earth and sand, etc. The load such as the excavation reaction force received from the working device during the excavation work is received by the revolving wheel mounting portion provided on the main frame of the upper revolving superstructure.

For this reason, when increasing the excavating force or the like of the working apparatus, it is necessary to make the main frame of the upper revolving structure stronger and larger. However, when the size of the main frame is increased to increase the width, there is a problem that it becomes difficult to satisfy the limitation of the transport width.

In order to satisfy the limitation of the transport width, the inventors of the present invention provide left and right cut portions at the turning wheel mounting portion of the main frame, and make the width of the main frame smaller than the outer diameter of the turning wheel. Considered to do.

However, in this case, a gap is formed between the turning wheel provided on the lower traveling body and the main frame due to the left and right cut portions. A defect that a foreign substance such as dust invades occurs.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a cut portion on a main frame of an upper revolving structure so as to satisfactorily satisfy restrictions on a transport width and the like. It is another object of the present invention to provide a revolving construction machine capable of reducing material cost and weight, and preventing foreign substances from entering a grease bath or the like of a revolving device. .

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a lower traveling body, and left and right bed frames which are pivotally mounted on the lower traveling body with respect to a central main frame. An upper revolving body whose side can be divided, between the main frame and the lower traveling body of the upper revolving body, an inner ring provided on the lower traveling body side and having an internal gear formed on an inner peripheral side; The rotation of the rotation motor is performed with respect to an outer ring rotatably provided on the inner ring via a rolling element and to which the main frame is detachably attached, and a pinion provided on the main frame and meshing with an internal gear of the inner ring. The present invention is applied to a turning type construction machine including a turning speed reducer for transmitting at a reduced speed, and a grease bus provided on the lower traveling body side for storing lubricating oil to be supplied between the pinion and the internal gear. .

The first aspect of the present invention is characterized in that the left and right lateral widths of the main frame are smaller than the outer diameter of the outer ring. A right cut portion is provided, and the outer ring is provided with a cover for preventing foreign matter from entering at a position corresponding to the left and right cut portions.

With this configuration, the width of the main frame can be made smaller than the outer diameter of the outer race to satisfy the limitation of the transportation width. Parts,
The main frame can be reduced in size and weight.
Then, the gap generated between the cut portion of the main frame and the outer ring of the turning wheel can be covered by the cover, and foreign matter from the outside can be prevented from entering the grease bath by the cover.

According to the second aspect of the present invention, the left and right cut portions are configured to extend in parallel with each other along the front and rear directions of the main frame, and between the cover and the cut portion along the cut portion. And a sealing member that extends.

Thus, the width of the main frame can be effectively reduced at the left and right cut portions extending in parallel to each other in the front and rear directions of the main frame. By providing the seal member over substantially the entire length of the cut portion, the space between the cover and the cut portion can be reliably sealed, and a countermeasure against foreign matter such as rainwater can be effectively taken.

Further, according to the third aspect of the invention, the cut portion is provided with a step portion for overlapping on the cover, and the seal member is configured to abut against the step portion with interference.
With this, for example, in a state where the cover is previously assembled on the upper surface side of the outer ring, when the main frame is mounted on the outer ring of the turning wheel from above, the step portion of the cut portion can be arranged so as to overlap the cover, At times, the sealing member can be elastically deformed between the cover and the step portion, and the sealing performance can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A large-sized hydraulic excavator will be described below as an example of a swing type construction machine according to an embodiment of the present invention.
This will be described in detail with reference to FIGS. 1 to 11 of the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a lower traveling body. The lower traveling body 1 includes, as shown in FIGS. 5 to 7, a track frame 2 having a round body 2A at the center and a left side of the track frame 2. , Right and left crawler belts 5, 5 wound between the idler wheel 3 and the drive wheel 4.

Reference numeral 6 denotes an upper revolving unit which is rotatably provided on the track frame 2 of the lower traveling unit 1.
The main frame 7 is located at a central portion and extends forward and rearward as shown in FIGS.
2 and 3, the left and right bed frames 8 and 9 are provided so as to be separable (detachable) as shown in FIGS. 2 and 3, and the counter is detachably provided at the rear end of the main frame 7. And a weight 10 and the like.

Here, as shown in FIGS. 1 to 3, a pair of brackets 7A, 7A, etc., which support the working device 11 so as to be able to move up and down, are provided on the front end side of the main frame 7.
Around the turning center O, a mounting portion 7B (hereinafter, referred to as a turning wheel mounting portion 7B) for the turning wheel 22, which will be described later, is provided at a position corresponding to the round body 2A of the track frame 2. A counter weight 1 is provided at the rear end of the main frame 7.
A pair of weight attachment portions 7C, 7C to which 0 is attached are provided.

On the other hand, on the front side of the left bed frame 8, a cab bed 12 erected upward as shown in FIG. 1 and a cab defining an operator cab mounted on the cab bed 12 are provided. 13, and a building cover 15 that defines a machine room accommodating the prime mover 14 and the like is provided on the rear side of the cab bed 12 as shown in FIGS. 2 and 3.

Further, another building cover 16 accommodating the prime mover 14 and the like is also provided inside the bed frame 9 on the right side, and a multiple valve device 17 including a plurality of directional control valves and the like is provided in front of the building cover 16. , 17 are provided. The weight attachment portions 7C, 7C are provided on the rear side of the main frame 7.
A large fuel tank 18 and a hydraulic oil tank 19 are disposed in front of the tank.

Reference numerals 20 and 20 denote left and right cut portions provided on the turning wheel mounting portion 7B of the main frame 7, respectively.
Numerals 0 are located on the left and right sides of the turning wheel mounting portion 7B, and extend parallel to each other with a certain length in the front and rear directions of the main frame 7. Each of the cut portions 20 has a lateral width W of the main frame 7 smaller than an outer ring 25 (outer diameter D) of the turning wheel 22, which will be described later, as shown in FIGS. (Not shown), etc., so as to satisfy transportation restrictions.

As shown in FIG. 11, the cut portion 20 of the main frame 7 is provided with a stepped portion 20A having an L-shaped cross section on the lower surface side.
The depth dimension d and the height dimension h are formed in order to provide the cut portion 20 with an allowance for the overlap. The depth d of the stepped portion 20A is set to the inner surface 3 of the cover 37 described later.
7A, the position is set back by the dimension d1, and this dimension d1 is slightly larger than a protrusion dimension d2 (d1> d2) described later.

Reference numeral 21 denotes the track frame 2 of the lower traveling body 1.
And a main frame 7 of the upper revolving unit 6. The revolving unit 21 is provided with a bolt on the round body 2 </ b> A of the track frame 2 as shown in FIGS. 6, 7 and 9. Inner ring 24 and outer ring 2 which are attached using
5 and a speed reducer 30 for turning described later.
And a turning motor 31 and a grease bus 33 and the like.

Numeral 24 denotes an inner ring which constitutes a part of the turning wheel 22. The inner ring 24 has a plurality of bolts 23 as shown in FIG.
The center of rotation O is fixed to the upper end side of
Are arranged in a concentric manner around the center. An internal gear 24A is formed on the inner peripheral side of the inner ring 24 over the entire circumference, and the internal gear 24A is configured to mesh with a pinion 32 described later. Further, an annular notch step portion 24B is provided below the internal gear 24A on the inner peripheral side of the inner ring 24, and a grease bus 33 described later is provided in the notch step portion 24B.

Reference numeral 25 denotes an outer ring which constitutes the turning wheel 22 together with the inner ring 24. The outer ring 25 is rotatable around the inner ring 24 through rollers 26, 27 and 28 as rolling elements as shown in FIG. 7 and 8, and is fixed to the turning wheel mounting portion 7B of the main frame 7 using a plurality of bolts 29, 29,... And outer ring 25
Is larger than the width W of the main frame 7 as shown in FIGS.

Reference numeral 30 denotes a turning speed reducer mounted on the main frame 7 of the upper turning body 6, and the speed reducer 30 is constituted by a planetary gear speed reducer or the like, and has an upper end side as shown in FIG. A swing motor 31 composed of a hydraulic motor is provided. A pinion 32 is provided at the lower end of the speed reducer 30.
The pinion 32 is meshed with an internal gear 24 </ b> A formed on the inner ring 24 of the turning wheel 22.

The pinion 32 revolves while rotating along the internal gear 24A when the rotational force of the revolving motor 31 is transmitted via the speed reducer 30, and the revolving force at this time causes the upper revolving unit 6 to revolve. It is configured to turn on the undercarriage 1.

Here, the main frame 7 of the upper swing body 6
As shown in FIG. 2 to FIG. 4, for example, four sets of reduction gears 30 (rotation motor 31
And the pinion 32 of each of the speed reducers 30 is meshed with the internal gear 24A of the inner race 24 at regular intervals.

Reference numeral 33 denotes a lubricating oil G such as grease to be supplied to a meshing portion between the internal gear 24A of the inner ring 24 and each pinion 32.
As shown in FIG. 9, the grease bath 33 includes an annular bottom plate 34 whose outer peripheral edge is fixed to the notch step 24B of the inner race 24 using bolts or the like, A cylindrical plate 35 erected upward from the inner peripheral edge side. The cylindrical plate 35 forms a lubricating oil storage space 36 such as grease on the bottom plate 34 between the cylindrical plate 35 and the inner ring 24 of the turning wheel 22. ing.

Reference numerals 37, 37 denote a pair of left and right covers for preventing intrusion of foreign matter provided on the outer ring 25 of the turning wheel 22, and the respective covers 37 are provided at respective cut portions of the main frame 7 as shown in FIGS. At the position corresponding to 20, the outer ring 25 of the turning wheel 22 is covered from above, and the inside of the turning wheel 22 (for example, the grease bath 3
A foreign material such as rainwater or dust is prevented from entering the inside 3) together with a seal member 39 described later.

Here, the cover 37 is formed of a thin steel plate or the like into an elongated trapezoidal plate shape as shown in FIG. 10, and its contour corresponds to the outer shape of the outer ring 25. And the cover 37
Are detachably fixed to the upper surface side of the outer ring 25 by using a plurality of bolts 38, 38,...
As shown in FIG. 7, the outer ring 25 extends to a position almost in contact with the inner peripheral surface.

Reference numeral 39 denotes a sealing member for sealing between the cut portion 20 of the main frame 7 and the cover 37. The sealing member 39 is formed as an elongated plate-like packing made of an elastic resin material, as shown in FIGS. Is fixed to the upper surface side of the cover 37 by means such as adhesion. And
The seal member 39 extends linearly along the inner side surface 37A of the cover 37, and its inner end is formed as shown in FIG.
7 protrudes from the inner side surface 37A by a protrusion dimension d2 (d2 <d1).

The total height h 1 of the cover 37 and the seal member 39 is determined by the cut portion 20 of the main frame 7.
Is larger than the height h of the step portion 20A (h1> h). When the cut portion 20 of the main frame 7 is superimposed on the seal member 39, the seal member 39 is elastically deformed as shown in FIG. The space between the cut portion 20 of the frame 7 and the cover 37 can be sealed well.

The large-sized hydraulic excavator according to the present embodiment has the above-described configuration, and its operation will be described next.

First, at a work site or the like, the lower traveling body 1
When the upper swing body 6 is swung upward, the swing motor 31 of the swing device 21 shown in FIG. 7 is driven to rotate, and the rotation of the swing motor 31 is transmitted to the pinion 32 via the speed reducer 30. The pinion 32 is used as the internal gear 24 of the inner ring 24.
By rotating while meshing with A, the upper-part turning body 6
Is turned on the undercarriage 1.

Further, a lubricating oil G is contained in a grease bath 33 provided on the round body 2A of the lower traveling body 1, and the pinion 32 is immersed in the lubricating oil G together with the internal gear 24A. The meshing portion between the internal gear 24A and the pinion 32 is always kept in a lubricated state, and the turning operation of the upper turning body 6 can be stabilized.

On the other hand, when excavation work such as earth and sand is performed using the working device 11 provided on the front side of the upper revolving unit 6, the upper revolving unit 6 is turned on the lower traveling unit 1 in an arbitrary direction. In this state, the work apparatus 11 is operated to excavate earth and sand by the bucket 11A or the like. Then, when discharging the sediment loaded in the bucket 11A to another position, the upper revolving unit 6 is turned toward another position, and the working device is operated in this state to discharge the sediment in the bucket 11A. Let it.

In this case, the excavation reaction force from the bucket 11A and the weight of the upper revolving unit 6 are received by the revolving wheel mounting portion 7B provided on the main frame 7 of the upper revolving unit 6, and the revolving device is used. 21 as a load, and a large thrust load and a radial load are applied between the inner ring 24 and the outer ring 25 of the turning wheel 22 via the rollers 26 to 28. Become.

A large load is also applied between the internal gear 24A of the inner race 24 and the pinion 32 due to the weight of the upper revolving unit 6, and a large frictional force is applied between the internal gear 24A and the pinion 32. Is more likely to occur. These loads, frictional forces, and the like become larger as the vehicle structure becomes larger.

For this reason, in the case of a large-sized hydraulic excavator, the size of the turning wheel 22 is increased in accordance with the vehicle weight or the like in order to increase the load capacity of the turning wheel 22, for example, to reduce the tooth width of the internal gear 24A. By comparison, the height dimension (axial dimension) of the inner ring 24 and the outer ring 25 and the like is increased, and the outer diameter D and the like of the outer ring 25 are increased.

In order to increase the excavating force or the like of the working device 11, it is necessary to make the main frame 7 of the upper swing body 6 more robust and to increase the size. However, if the size of the main frame 7 is increased and the width is increased to a size corresponding to the outer diameter D of the outer race 25, it becomes difficult to satisfy the limitation of the transport width.

That is, in the case of a large-sized hydraulic excavator, the lower traveling unit 1 and the upper revolving unit 6 are each disassembled into a plurality of pieces and transported, and then assembled at a work site to satisfy the limitation of the transport width. I have. However, even when the upper swing body 6 is divided into the central main frame 7 and the left and right bed frames 8 and 9 as shown in FIG. It becomes impossible to satisfy the limitation of the transport width during transport.

Therefore, in the present embodiment, the left and right cut portions 2 are attached to the turning wheel mounting portion 7B of the main frame 7.
4, the width W of the main frame 7 is formed to be smaller than the outer diameter D of the turning wheel 22 as shown in FIG.
A cover 37 is attached to each of the cuts 5 at positions corresponding to the cuts 20 with bolts 38 and the like, and each cover 37 is provided with a seal member 39 for sealing between the cuts 20 of the main frame 7. I have.

As a result, the width W of the main frame 7 can be made smaller than the outer diameter D of the turning wheel 22 by the left and right cut portions 20 provided on the turning wheel mounting portion 7B of the main frame 7. It is possible to satisfactorily satisfy the limitation of the transport width. The material of the main frame 7 (steel)
Can be reduced by the cut portion 20, the material cost can be reduced, the manufacturing cost can be reduced, and the weight can be reduced.

In this case, the turning wheel mounting portion 7B of the main frame 7 is made of a thick steel plate or the like, and a large number of bolts 29, between the left and right cut portions 20, 20 with respect to the turning wheel 22 on the lower traveling body 1 side. 29,... For this reason,
The main frame 7 can be fixed to the revolving wheel 22 with sufficient strength, and a load due to the excavation reaction force or the like is applied between the revolving wheel mounting portion 7B of the main frame 7 and the revolving wheel 22 on the lower traveling body 1 side. We can certainly receive it.

The turning wheel mounting portion 7 of the main frame 7
Even when a gap due to the cut portion 20 is formed between B and the swivel wheel 22, a cover 37 for preventing foreign matter from entering is provided on the outer ring 25 of the swivel wheel 22 at a position corresponding to the cut portion 20. Since the seal member 39 is provided between the lower traveling unit 1 and the unit 20, it is possible to prevent foreign matters such as rainwater and dust from entering the grease bath 33 and the like on the lower traveling body 1 through the gap.

Particularly, as shown in FIG. 11, the cut portion 20 of the main frame 7 is formed with a step portion 20A having an L-shaped cross section having a depth dimension d and a height dimension h.
A allows the cut portion 20 to have a margin for overlapping the cover 37 (seal member 39).

The step portion 20A of the cut portion 20 is
The depth d of the step portion 20A extends to a position deeper than the inner surface 37A of the cover 37 by a distance d1 and is larger than the protrusion d2 of the seal member 39 (d1> d2). Is formed. Further, the height h of the step portion 20A is formed to be smaller than the total height h1 of the cover 37 and the seal member 39.

As a result, the cut portion 2 of the main frame 7
When the “0” is superimposed on the seal member 39, the seal member 39 is largely elastically deformed as shown in FIG. 9, and can be brought into contact with the step portion 20 A of the cut portion 20 with interference. Then, the gap between the cut portion 20 and the cover 37 can be completely closed by the seal member 39, and it is possible to satisfactorily prevent foreign matters such as rainwater and dust from entering the grease bath 33 side.

Therefore, according to the present embodiment, the left and right cut portions 20, 20 are provided on the main frame 7 of the upper swing body 6.
Is provided, it is possible to satisfactorily satisfy the limitation of the transport width, etc., and it is possible to reduce material cost and weight. In addition, foreign substances from the outside can be prevented from entering the grease bath 33 of the turning device 21 and the like.
The life of the lubricating oil G and the like housed therein can be reliably extended.

In the above embodiment, the sealing member 3
9 has been described as being provided on the cover 37 by means such as bonding, but instead of this, for example, the step portion 20 of the cut portion 20 may be provided.
A seal member is provided on the A side, and this seal member is
It may be configured to abut against the inner side surface 37A or the like with interference.

Further, in the above-described embodiment, a three-row roller type swivel wheel in which three sets of rollers 26, 27 and 28 serving as rolling elements are disposed between the inner ring 24 and the outer ring 25 of the swivel wheel 22 is provided. 2
2 has been described as an example, but the present invention is not limited to this. For example, an angular type turning wheel using a rolling element formed of a steel ball or the like may be used.

Furthermore, in the above-described embodiment, a large-sized hydraulic excavator has been described as an example of a construction machine. However, the present invention is not limited to this, and for example, other turning equipment equipped with a turning device having a grease bath or the like is used. It can be widely applied to construction machinery and the like.

[0055]

As described above in detail, according to the first aspect of the present invention, the main frame of the upper revolving structure is provided with left and right cut portions, and the cut portions are provided with the left and right lateral widths of the main frame. The outer frame is formed to have a size smaller than the outer diameter of the outer ring, and the outer ring is provided with a cover for preventing foreign matter intrusion at positions corresponding to the left and right cut portions. For example, when the main frame is transported by a trailer or the like, the transport width can be satisfactorily satisfied.

Further, the material cost of the main frame can be reduced, the manufacturing cost can be reduced, and the weight of the main frame can be reduced. Then, the gap generated between the cut portion of the main frame and the outer ring of the turning wheel can be covered by the cover, and foreign matter from the outside can be prevented from entering the grease bath by the cover.

According to the second aspect of the present invention, the width of the main frame can be effectively reduced by extending the left and right cut portions parallel to each other in the front and rear directions of the main frame. Further, by providing the seal member over the entire length of the cut portion, the space between the cover and the cut portion can be reliably sealed, and foreign matter such as rainwater can be reliably blocked from entering the grease bath side.

Further, according to the third aspect of the present invention, when the main frame is attached to the outer ring of the turning wheel from above with the cover previously assembled on the upper surface side of the outer ring, the stepped portion of the cut portion is covered. The sealing member can be elastically deformed between the cover and the step portion, and the gap between the cut portion and the cover can be reliably sealed.

[Brief description of the drawings]

FIG. 1 is an overall view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view showing the internal structure of the upper swing body in FIG.

FIG. 3 is a plan view showing a state where the upper swing body in FIG. 2 is disassembled into a main frame and left and right bed frames.

FIG. 4 is a plan view showing a state where a main frame is mounted on a lower traveling body.

FIG. 5 is a front view of a lower traveling body and a main frame shown in FIG. 4;

FIG. 6 is a left side view of the lower traveling body and the main frame shown in FIG. 4;

FIG. 7 is an enlarged cross-sectional view of the track frame, the turning device, and the like as viewed from the direction indicated by arrows VII-VII in FIG.

FIG. 8 is an enlarged plan view showing a turning wheel mounting portion and the like in FIG. 4;

FIG. 9 is an enlarged cross-sectional view of a cover provided on an outer wheel of a turning wheel, a cut portion of a main frame, and the like, as viewed from the IX-IX direction in FIG.

FIG. 10 is an enlarged plan view showing a turning wheel, a cover, and the like before a main frame is mounted.

FIG. 11 is an enlarged cross-sectional view of the state before the main frame is attached to the outer wheel of the turning wheel, as viewed from the XI-XI direction in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Track frame 2A round body 6 Upper revolving body 7 Main frame 7B Attachment part (slewing ring attaching part) 8, 9 Bed frame 20 Cut part 20A Stepped part 21 Swivel device 22 Swirl ring 24 Inner ring 24A Internal gear 25 Outer ring 26, 27, 28 Roller (roller) 30 Reduction gear 31 Swing motor 32 Pinion 33 Grease bath 37 Cover 39 Seal member G Lubricating oil

Claims (3)

[Claims] 1. An upper revolving unit comprising: a lower traveling unit; and an upper revolving unit which is rotatably mounted on the lower traveling unit and is configured such that left and right bed frame sides can be divided with respect to a central main frame. Between the main frame and the lower traveling body, an inner ring provided on the lower traveling body side and having an internal gear formed on an inner peripheral side, and the main wheel rotatably provided via a rolling element on the inner ring. An outer ring to which a frame is detachably attached; a speed reducer for turning which transmits the rotation of the turning motor to a pinion provided on the main frame and meshing with the internal gear of the inner ring; And a grease bath for storing lubricating oil to be supplied between the pinion and the internal gear, wherein the main frame has a left and right lateral width defined by an outer diameter of the outer ring. Left to the mounting portion of the outer race for also be reduced,
A revolving construction machine, wherein a right cut portion is provided, and a cover for preventing intrusion of foreign matter is provided on the outer ring at a position corresponding to the left and right cut portions. 2. The left and right cut portions extend parallel to each other along the front and rear directions of the main frame, and a seal member extending along the cut portion is provided between the cover and the cut portion. The swivel type construction machine according to claim 1, which is provided. 3. The revolving construction machine according to claim 2, wherein the cut portion is provided with a stepped portion for overlapping the cover, and the seal member is configured to abut against the stepped portion with an interference.