JP2000170208A - Slewing type construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease an oil amount of lubricating oil stored in a grease bath, reduce the total weight including the grease bath, and improve durability and longevity. SOLUTION: An annular cutout step part 48 located under an internal gear 47 is formed on an inner ring 42 of a slewing ring 41. Stopper plates 56 are fixed on an inner periphery side of a round drum 8 by welding. When a bottom plate 51 of a grease bath 50 is positioned to the inner ring 42, an outer periphery edge part 51A of the bottom plate 51 is held between a lower surface of the cutout step part 48 and stopper plates 56. Furthermore, a lubricating oil storage space 53 for supplying lubricating oil G such as grease to a pinion 26 and the internal gear 47 is formed between a cylindrical plate 52 stood upward from an inner periphery edge part 51B of the bottom plate 51 and the inner ring 42.

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, a hydraulic crane, etc., and more particularly to a swing type construction machine having a large-diameter swing wheel and a large overall structure. Related to construction machinery.

[0002]

2. Description of the Related Art In general, a lower traveling body as a base, an upper revolving body rotatably mounted on the lower traveling body, and a work provided on the front side of the upper revolving body so as to be capable of elevating. BACKGROUND ART A swing type construction machine such as a hydraulic shovel or a hydraulic crane including an apparatus is known from, for example, JP-A-7-189291. In this type of conventional swing type construction machine, a swing device is provided between the lower traveling structure and the upper swing structure, and the swing device moves the upper swing structure in an arbitrary direction with respect to the lower traveling structure. It is configured to turn.

Therefore, a large-sized hydraulic excavator will be described as an example of a swing type construction machine provided with a swing device according to the prior art with reference to FIGS. 6 to 8.

In FIG. 1, reference numeral 1 denotes a lower traveling body as a base, and the lower traveling body 1 includes a track frame 7 and the like described later. Reference numeral 2 denotes an upper revolving structure that is rotatably provided on the lower traveling structure 1. The upper revolving structure 2 includes a cab 4 defining a driving cab on a revolving frame 3, a building cover 5 defining a machine room, and A counter weight 6 and the like are provided. A working device (not shown) is provided on the upper revolving unit 2 at the front side of the revolving frame 3 so as to be able to move up and down.

[0005] Reference numeral 7 denotes a track frame serving as a main body of the lower traveling body 1. The track frame 7 has a center frame 9 having a round body 8 in the center as shown in FIG. The vehicle generally comprises a pair of side frames 10 (only one is shown) provided on both right sides and extending in front of and behind the vehicle. And the round body 8 of the center frame 9
Is disposed so as to be concentric with respect to a pivot axis OO as a pivot center shown in FIG. 7, and the upper revolving unit 2 is pivoted about a pivot axis OO by a later-described pivot device 14 on the round body 8. Is turned.

An idler wheel 11 is provided at one end of each side frame 10 as shown in FIG. 6, and a drive wheel 12 driven by a traveling hydraulic motor (not shown) or the like is provided at the other end. Is provided. A crawler belt 13 is wound between the idler wheel 11 and the drive wheel 12, and the vehicle is driven by driving the crawler belt 13 with the rotational force of the hydraulic motor.

A turning device 14 is provided between the lower traveling structure 1 and the upper revolving structure 2. The revolving device 14 is, as shown in FIG. 7 and FIG. 8, a turning wheel 15 including an inner wheel 16 and an outer wheel 19, which will be described later, provided between the turning frame 8 and the turning frame 3 on the upper turning body 2 side, a speed reducer 24 and a turning motor 25 for turning, described later, and the grease bus 2.
7 and the like.

Reference numeral 16 denotes an inner ring of a turning wheel 15 provided on the lower traveling body 1 side. The inner ring 16 is formed by using a plurality of bolts 17 (only one is shown) serving as a fastening member and the like, and an upper end surface of the round body 8. And is concentrically arranged around the pivot axis OO. An internal gear 18 is formed on the inner peripheral side of the inner ring 16 over the entire circumference, and the internal gear 18 is configured to mesh with a pinion 26 described later.

Further, an annular convex portion 16A projecting outward in the radial direction is integrally formed on the outer peripheral side of the inner ring 16, and rollers 20 and 2 described later are provided between the annular convex portion 16A and the outer ring 19.
A plurality of pieces 1 and 22 are arranged in the circumferential direction, respectively.

Reference numeral 19 denotes an outer ring that constitutes the turning wheel 15 together with the inner ring 16, and the outer ring 19 includes rollers 20 as rolling elements.
It is rotatably attached to the outer peripheral side of the inner ring 16 via the vias 21 and 22, and is fixed to the revolving frame 3 on the upper revolving unit 2 side using a plurality of bolts 23 (only one is shown).

Here, among the rollers 20, 21 and 22, the roller 20 is formed with a maximum outer diameter.
A plurality of rolls are provided between the upper surface side of the six annular convex portions 16A and the outer ring 19 so as to be rollable. A plurality of rollers 21 each having an intermediate diameter are rotatably disposed between the lower surface of the annular convex portion 16A and the outer ring 19, and the roller 22 having the smallest diameter is provided with the annular convex portion 16A.
A plurality of rolls are provided between the outer peripheral surface of the outer ring 19 and the outer ring 19.

The rollers 20, 21, and 22
2 receives the thrust load and the radial load acting between the inner ring 16 and the outer ring 19, thereby smoothly rotating the outer ring 19 around the inner ring 16, and the upper revolving structure 2 is stabilized on the lower traveling structure 1. To compensate for being driven to turn.

Reference numeral 24 denotes a speed reducer for turning mounted on the turning frame 3 of the upper turning body 2. The speed reducer 24 is constituted by a planetary gear speed reducer or the like, and a turning motor comprising a hydraulic motor is provided at the upper end side. 25 are provided. A pinion 26 is provided at the lower end of the speed reducer 24 so as to protrude downward, and the pinion 26 meshes with an internal gear 18 formed on the inner ring 16 of the turning wheel 15.

The pinion 26 revolves while rotating along the internal gear 18 when the rotational force of the revolving motor 25 is transmitted through the speed reducer 24, and the revolving force at this time causes the upper revolving body 2 to rotate. Is turned on the undercarriage 1.

In the case of a large-sized hydraulic excavator, a turning device 14 provided between the lower traveling structure 1 and the upper revolving structure 2 is used.
However, for example, two to four sets of reduction gears 24 and rotation motors 25 located around the rotation axis OO are configured, and the pinion 26 of each of these reduction gears 24 is provided with the internal gear 16 of the inner race 16 at regular intervals. 18 is engaged.

Reference numeral 27 denotes a grease bath for storing lubricating oil G such as grease to be supplied to a meshing portion between the internal gear 18 of the inner ring 16 and each pinion 26. The grease bath 27 is, as shown in FIG. An annular bottom plate 28 whose peripheral edge is fixed to the inner circumference of the upper end side of the round body 8 by full circumference welding, and a cylindrical plate 29 erected upward from the inner peripheral edge side of the bottom plate 28, The plate 29 forms a space 30 for housing a lubricating oil such as grease on the bottom plate 28 with the inner ring 16 of the turning wheel 15.

In the prior art constructed as described above, when turning the upper swing body 2 on the lower traveling body 1, the swing motor 25 of the swing device 14 is driven to rotate, and the swing motor 25 is rotated.
Is transmitted to the pinion 26 via the speed reducer 24, and the pinion 26 rotates while meshing with the internal gear 18 of the inner race 16, whereby the upper revolving unit 2 is driven to rotate on the lower traveling unit 1. . And the pinion 26 is the internal gear 18
At the same time, it is immersed in the lubricating oil G in the grease bath 27, and the meshing portion between the internal gear 18 and the pinion 26 is maintained in a lubricated state.

When excavation work such as earth and sand is performed using the working device provided on the front side of the upper swing body 2, the upper swing body 2 is turned on the lower traveling body 1 in an arbitrary direction. In this state, the work device is operated to excavate earth and sand by a bucket (not shown), for example. Then, when discharging the sediment loaded in the bucket to another position, the upper revolving unit 2 is turned toward another position, and the working device is operated in this state to discharge the sediment in the bucket.

In this case, the excavation reaction force from the bucket and the weight of the upper revolving unit 2 act as a load on the revolving wheel 15 of the revolving unit 14, and a load is applied between the inner ring 16 and the outer wheel 19 of the revolving wheel 15. , A large thrust load and a large radial load are applied via the rollers 20, 21, 22.

Further, a large load is also applied between the internal gear 18 of the inner ring 16 and the pinion 26, and a large frictional force is easily generated between the internal gear 18 and the pinion 26. These loads, frictional forces, and the like become larger as the vehicle structure becomes larger.

Therefore, in the prior art, in order to increase the load capacity of the turning wheel 15 used in a large-sized hydraulic excavator, the size of the turning wheel 15 is increased according to the vehicle weight or the like. In comparison, the height dimension (axial dimension) of the inner ring 16 and the outer ring 19 and the like is made larger.

A lubricating oil G such as grease is accommodated in the lubricating oil accommodating space 30 of the grease bath 27, and the lubricating oil G keeps the space between the internal gear 18 and the pinion 26 in a lubricated state. The frictional force generated between the internal gear 18 and the pinion 26 is reduced by the lubricating oil G.

[0023]

In the prior art described above, the bottom plate 28 of the grease bath 27 is fixed to the inner periphery of the upper end side of the round body 8 by means such as full circumference welding or the like. A lubricating oil accommodating space 30 is formed on the bottom plate 28 between the cylindrical plate 29 erected upward and the inner ring 16. And this lubricating oil storage space 30
Inside, lubricating oil G such as grease is supplied so as to have a prescribed height with respect to the tooth width of the internal gear 18.

However, in the case of a large hydraulic excavator,
In order to increase the load capacity of the turning wheel 15, the height of the inner ring 16 and the like is formed to be larger than the tooth width of the internal gear 18, so that the lubricating oil G to be stored in the grease bath 27 is used. 8 increases to the height level H1 illustrated in FIG. 8, and there is a problem that the lubricating oil G having an oil amount of, for example, several hundred kg must be stored in the grease bath 27.

The height level H is set in the grease bath 27.
In order to accommodate the lubricating oil G, the cylindrical plate 29 of the grease bath 27 needs to be formed large in the height direction, which not only increases the material cost of the cylindrical plate 29 but also increases the entire vehicle. There is a problem that the weight of the body also increases.

Further, the bottom plate 28 of the grease bath 27 has a configuration in which the outer peripheral edge portion is welded and fixed to the inner peripheral portion on the upper end side of the round body 8, so that not only the welding length is increased, but also the welding portion is increased. However, there is a problem that residual stress is easily generated, and if a crack occurs, the lubricating oil G in the grease bath 27 may leak to the outside.

The inventors of the present invention have previously reported in Japanese Patent Application No. Hei.
No. 26351, an annular step 31 is provided on the inner peripheral side of the inner ring 16 below the internal gear 18 as in the other prior art shown in FIG. Has been proposed in which the bottom plate 28 is fixed by a plurality of bolts 32.

In this case, the bottom plate 28 of the grease bath 27 can be attached to the inner peripheral side of the inner ring 16, and the distance from the bottom plate 28 to the internal gear 18 is compared with the prior art shown in FIG. Can be shortened. For this reason, the lubricating oil G such as grease is filled in the lubricating oil storage space 30 formed on the bottom plate 28 between the cylindrical plate 29 and the inner ring 16 at the height level H2.
The lubricating oil G having a prescribed height with respect to the tooth width of the internal gear 18 can be stored only by storing the lubricating oil G up to (H2 <H1), and the amount of lubricating oil G stored in the grease bath 27 can be reduced. There is an advantage.

However, in another conventional technique shown in FIG. 9, the outer peripheral edge of the bottom plate 28 is directly fixed to the annular step 31 formed on the inner peripheral side of the inner ring 16 by a plurality of bolts 32. Therefore, the following inconvenience may occur.

That is, during operation of the hydraulic excavator, the inner ring 16
Since an external force such as a torsional force is applied to the bolts 32, the external force at this time acts as a bending force and a shearing force on the bolts 32, and the bolts 32 may be loosened.

When each bolt 32 is loosened during operation, the lubricating oil G in the grease bath 27 not only leaks from between the annular step 31 of the inner race 16 and the outer peripheral edge of the bottom plate 28, but also In the worst case, the bolt 32 may be broken by a shearing force, and it is difficult to improve durability and life.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can reduce the amount of lubricating oil to be accommodated in a grease bath, and can reduce the total weight including the grease bath. It is an object of the present invention to provide a revolving construction machine capable of reducing the number of times and improving the workability during assembly.

Another object of the present invention is to enable the bottom plate of the grease bath to be positioned on the inner peripheral side of the inner race by using a stopper or the like for holding, and to cause cracks due to residual stress and the like. It is an object of the present invention to provide a swivel type construction machine capable of solving the above problem and improving durability and life.

[0034]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a lower traveling body and an upper revolving body which is rotatably supported on the lower traveling body via a revolving device.
The turning device is formed on an inner ring provided on the lower traveling body side, an outer ring provided on the upper revolving structure side and rotatably attached to the inner ring via a rolling element, and formed on an inner peripheral side of the inner ring. A rotation speed reducer having a pinion that meshes with the internal gear and transmitting rotation to the pinion by reducing the rotation of the rotation motor; anda lubricating oil supplied between the pinion of the speed reducer and the internal gear of the inner ring. The present invention is applied to a swing type construction machine constituted by a grease bath for storing.

A feature of the structure adopted by the first aspect of the present invention is that the grease bath is positioned on the inner peripheral side of the inner ring with the outer peripheral portion located below the internal gear, and the inner peripheral An annular bottom plate whose portion extends inward in the radial direction, and a cylindrical plate that stands upward from the inner peripheral edge side of the bottom plate and forms a lubricating oil accommodating space on the bottom plate with the inner ring. And
On the inner peripheral side of the inner ring, there is provided an annular notch step extending in a circumferential direction at a lower position of the internal gear in order to position an outer peripheral edge of the bottom plate, and the notch is provided on the lower traveling body side. A stopper for holding the outer peripheral edge of the bottom plate is provided between the step and the step.

With this configuration, the outer peripheral edge of the bottom plate can be sandwiched between the holding stopper provided on the lower traveling body side and the notch step of the inner ring, and the torsion of the inner ring directly affects the bottom plate. You will not do it. Further, the bottom plate of the grease bath can be attached to the inner peripheral side of the inner ring, and the distance from the bottom plate to the internal gear can be shortened. When lubricating oil such as grease is supplied into the lubricating oil storage space formed on the bottom plate between the cylindrical plate and the inner ring, even if a small amount of lubricating oil is supplied compared to the prior art, Lubricating oil can be stored up to a specified height with respect to the tooth width of the gear.

According to the second aspect of the present invention, the lower traveling body has a round body at the center of the track frame, and the stopper is located on the inner peripheral side of the round body and protrudes upward toward the lower surface of the bottom plate. It is configured to be provided. As a result, the upper end of the stopper provided on the inner peripheral side of the round body abuts against the lower surface of the bottom plate, and the outer peripheral edge of the bottom plate is strongly sandwiched between the upper end of the stopper and the notch step of the inner ring. can do.

Further, according to the third aspect of the present invention, a fastening member for fastening the inner ring is provided at the upper end side of the round body, and the fastening force of the fastening member causes the stopper between the round body side and the notch step of the inner ring to interpose. And a pinching force for pinching the outer peripheral edge of the bottom plate.

Thus, when assembling the inner ring on the upper end side of the round body, the outer peripheral edge of the bottom plate is sandwiched between the stopper on the round body side and the notch step of the inner ring. A clamping force for clamping the outer peripheral edge of the bottom plate can be generated by the fastening force.

On the other hand, in the invention of claim 4, the stopper comprises a plurality of stopper plates fixed at intervals on the inner peripheral side of the round body, and each of the stopper plates has an upper end formed by cutting the outer peripheral edge of the bottom plate into the inner ring. It is configured to press toward the notch step. Thereby, the outer peripheral edge of the bottom plate can be pressed against the notch step of the inner ring at the upper end side of each stopper plate, and the entire grease bath including the bottom plate can be assembled to the inner ring.

According to the fifth aspect of the present invention, the stopper is
A plurality of brackets having bolt holes fixed at intervals on the inner peripheral side of the round body, and screwed into the bolt holes of each bracket, and the upper end side presses the outer peripheral edge of the bottom plate toward the notch step of the inner ring. It consists of a plurality of bolts.

In this case, by pressing the outer peripheral edge of the bottom plate against the notch step of the inner ring at the upper end side of each bolt, the gap between the upper end of each bolt and the notch step of the inner ring is formed. The outer peripheral edge of the bottom plate can be pinched, and the entire grease bath including the bottom plate can be assembled to the inner ring, and the screwing position of the bolt with respect to the bolt hole of each bracket is adjusted to appropriately adjust the pinching force. Can be fine-tuned.

According to the sixth aspect of the present invention, a nut is fastened to each bolt, and each nut is secured to the bolt by pressing the outer peripheral edge of the bottom plate against the notch step of the inner ring. Is performed. Thereby, while pressing the outer peripheral edge of the bottom plate against the notch step of the inner ring at the upper end of each bolt,
Each nut can hold the bolt in a locked state.

Further, according to the invention of claim 7, a seal member is provided at the outer peripheral edge of the bottom plate to seal between the notch step of the inner ring. Accordingly, the gap between the outer peripheral edge of the bottom plate and the inner peripheral side of the inner ring can be sealed by the seal member, and the leakage of the lubricating oil stored in the lubricating oil storage space of the grease bath can be prevented.

[0045]

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 the accompanying drawings. In the present embodiment, the same components as those in the prior art shown in FIGS. 6 to 8 are denoted by the same reference numerals, and description thereof will be omitted.

Here, FIG. 1 to FIG. 3 show a first embodiment of the present invention. In the figure, reference numeral 41 denotes a turning wheel employed in the present embodiment. The turning wheel 41 constitutes the turning device 14 together with a turning speed reducer 24, a turning motor 25, and the like, similarly to the turning wheel 15 described in the related art. , Inner ring 42, outer ring 4
3 and rollers 44, 45, 46, and the like.

An annular projection 42A is integrally formed on the inner ring 42 of the revolving wheel 41 on the outer peripheral side, and rollers 44, 4 as rolling elements are provided between the annular projection 42A and the outer ring 43.
5, 46 are rollers 20, 21, 22 described in the prior art.
They are arranged so that they can roll in the same manner as described above. An internal gear 47 including a plurality of teeth 47A is integrally formed on the inner peripheral side of the inner ring 42. The pinion 26 meshes with the internal gear 47 in the same manner as the internal gear 18 described in the related art. ing.

Numeral 48 denotes an annular notch step provided on the inner peripheral side of the inner ring 42. The notch step 48 is located below the internal gear 47 as shown in FIG. It is formed as an annular step in the shape of a letter. The notch step portion 48 includes a lower surface 48A and a peripheral surface 48B extending all around the inner peripheral side of the inner ring 42.

In this case, the lower surface 48A of the notch step portion 48
Is flush with the lower end surface 47B of the internal gear 47 (in the same plane).
And a flat surface on which the outer peripheral side of a bottom plate 51 described later is abutted. As shown in FIG. 3, the internal gear 47 has a concave curved flank 47C located at the lower end side of each tooth portion 47A, and the flank 47C faces downward to the lower end face 47B. Extends to.

Reference numeral 49 denotes a plurality of bolt insertion holes (only one is shown) formed in the inner ring 42, and a plurality of the bolt insertion holes 49 are provided at regular intervals in the circumferential direction of the inner ring 42. It is drilled in the direction (axial direction). And
Each bolt 17 as a fastening member is inserted into each bolt insertion hole 49 similarly to the related art, and the inner ring 42 is firmly fastened to the upper end side of the round body 8 by each bolt 17.

Reference numeral 50 denotes a grease bath which stores lubricating oil G such as grease to be supplied to a meshing portion between the internal gear 47 of the inner ring 42 and each of the pinions 26. The grease bus 50 is the grease described in the prior art. A bottom plate 51 and a tubular plate 52 are formed in substantially the same manner as the bus 27, and the tubular plate 52 forms a lubricating oil storage space 53 such as grease on the bottom plate 51 between the bottom plate 51 and the inner ring 42 of the turning wheel 41. .

However, the bottom plate 51 of the grease bath 50 is
As shown in FIG. 2, the outer peripheral side is formed as a thin outer peripheral edge 51A, and the outer peripheral edge 51A is abutted against the lower surface 48A of the notch step portion 48 on the inner peripheral side of the inner ring 42. .

A cylindrical plate 52 is fixed to the bottom plate 51 on the inner peripheral edge 51B side by welding. The cylindrical plate 52 has a smaller height (axial direction) than the cylindrical plate 29 described in the related art, and the upper end thereof slightly exceeds the upper surface of the pinion 26 as shown in FIG. Extending to the position.

Here, as shown in FIG. 1, the outer peripheral edge 51A of the bottom plate 51 is
The grease bus 50 is attached to the inner peripheral side of the inner ring 42 by being sandwiched between the two notch step portions 48. Lubricating oil G such as grease is supplied into the lubricating oil accommodating space 53, and the lubricating oil G is lubricated on the bottom plate 51 so as to have a specified height level H 3 with respect to the tooth width of the internal gear 47. It is stored in the oil storage space 53.

Reference numeral 54 denotes a seal groove formed in the outer peripheral edge portion 51A of the bottom plate 51. Reference numeral 55 denotes an O-ring as a seal member mounted in the seal groove 54. The O-ring 55 is an inner ring 42.
Abuts against the lower surface 48A of the notch step portion 48 with an interference on the inner peripheral side of the notch portion, thereby providing a liquid-tight seal between the outer peripheral edge portion 51A of the bottom plate 51 and the lower surface 48A of the notch step portion 48. ing.

That is, when assembling the bottom plate 51 of the grease bath 50 on the inner peripheral side of the inner ring 42, the outer peripheral edge 51 A of the bottom plate 51 is connected to the notch step 48 on the inner peripheral side of the inner ring 42 as shown in FIG. Each stopper plate 56 is pressed upward by the stopper plate 56 so that the bottom plate 51
Is sandwiched between the notch step 48 of the inner race 42 and each stopper plate 56.

Thus, the O-ring 5 in the seal groove 54
5 is a lower surface 48A of the notch step portion 48 on the inner peripheral side of the inner ring 42.
, And a liquid-tight seal is provided between the outer peripheral edge 51A of the bottom plate 51 and the lower surface 48A of the notch step 48.

Are stopper plates for clamping which are fixed to the inner peripheral side of the round body 8 by welding. Each stopper plate 56 is made of a metal plate such as a steel plate and has a rectangular shape as shown in FIG. It is formed, and its upper end protrudes upward from the upper surface of the round body 8 by a predetermined fixed dimension. The upper end surface of each stopper plate 56 is formed as a flat surface, and sandwiches the outer peripheral edge 51A of the bottom plate 51 between the notch step 48 of the inner race 42 from above and below.

Further, reference numeral 57 denotes a bottomed bolt fastening hole formed at the upper end side of the round body 8.
Each of the bolts 1 is disposed at regular intervals in the circumferential direction and is inserted into a bolt insertion hole 49 of the inner race 42 as shown in FIG.
The lower end of 7 is screwed. At this time, a fastening force is applied between the round body 8 and the inner ring 42 by the bolts 17, and the outer peripheral edge 51 </ b> A of the bottom plate 51 is brought into contact with the notch step 48 of the inner ring 42 by the fastening force. It is strongly clamped between the stopper plate 56.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in the present embodiment, an annular notch step 48 is formed below the internal gear 47 on the inner ring 42 of the revolving wheel 41 and the inner peripheral side of the Each stopper plate 56 is provided, and the bottom plate 51 of the grease bath 50 is provided.
Is positioned with respect to the inner ring 42, the outer peripheral edge 51A of the bottom plate 51 is sandwiched between the lower surface 48A of the notch step 48 and each stopper plate 56. In this case, when the inner ring 42 is fastened and fixed to the round body 8 using the bolt 17, the bolt 1 is attached to the bottom plate 51.
The clamping force of No. 7 generates a clamping force.

Therefore, the bottom plate 51 of the grease bath 50 can be positioned with respect to the notch step portion 48 of the inner race 42 by using the stopper plates 56 on the round body 8 side.
The lubricating oil storage space 5 for supplying the lubricating oil G such as grease to the pinion 26 and the internal gear 47 is provided between the inner ring 42 and the cylindrical plate 52 erected upward from the inner peripheral edge 51B of the lubricating oil.
3 can be formed as a sturdy structure.

The inner ring 4 arranged above the round body 8
Since the bottom plate 51 of the grease bath 50 is attached to the inner peripheral side of the second through a notch step 48 in the form of a ring, the distance from the bottom plate 51 to the tooth portion 47A of the internal gear 47 is compared with that of the prior art. The amount of the lubricating oil G to be supplied to the specified height (the height level H3 shown in FIG. 1) of the internal gear 47 in the lubricating oil accommodating space 53 is greatly reduced as compared with the prior art. Can be done.

Since the height level H3 of the lubricating oil G contained in the grease bath 50 can be made smaller than the height level H1 (H1> H3) described in the prior art, the cylindrical plate 5
2 can be shortened, the material cost can be reduced, and the weight can be reduced.

Further, in order to attach the bottom plate 51 to the inner ring 42, it is only necessary to clamp the outer peripheral edge 51A of the bottom plate 51 between the notch step portion 48 of the inner ring 42 and each stopper plate 56. There is no need to apply welding means or the like to the outer peripheral side of the bottom plate 51, and there is no fear of cracks or the like due to residual stress at the time of welding, and the entire grease bath 50 is provided with an annular notch And the like.

Even when the excavator is running, turning, excavating, or the like, the reaction force generated during running, twisting occurs on the round body 8 side, or even when an external force such as torsion is applied to the turning wheel 41 side. This influence does not reach the bottom plate 51 side from between the notch step portion 48 of the inner race 42 and each stopper plate 56, and the outer peripheral edge 51A of the bottom plate 51 can be held in a stable holding state for a long period of time.

Therefore, according to the present embodiment, the amount of the lubricating oil G to be accommodated in the grease bath 50 can be reliably reduced, and the total weight of the grease bath 50 including the cylindrical plate 52 can be reduced. It can be reduced effectively. Then, the bottom plate 51 of the grease bath 50 is positioned on the inner peripheral side of the inner ring 42 by using a holding means such as each stopper plate 56 instead of the welding means. It is not necessary to perform welding or the like on the upper end side, and it is also possible to solve the problem that cracks occur due to the influence of residual stress and the like.

Also, when an external force such as a torsional force is applied to the inner ring 16 of the turning wheel 15 or the like during the operation of the hydraulic excavator, the external force at this time is applied to the outer peripheral edge 51A of the bottom plate 51 by, for example, bending stress. And shear stress, thereby preventing adverse effects, and can reliably improve durability and life.

The grease bath 50 has a simple structure in which the outer peripheral edge 51A of the bottom plate 51 is sandwiched between the notch step 48 of the inner race 42 and each stopper plate 56.
Can be positioned on the inner peripheral side of the inner ring 42,
For example, as shown in FIG.
In addition to eliminating the need for fixing means such as the above, it is possible to eliminate the work of machining the screw holes, etc., to improve the workability during assembly, and to simplify the repair work and the like.

Further, an O-ring 55 is attached between the lower surface 48A of the notch step 48 and the outer peripheral edge 51A of the bottom plate 51 on the inner peripheral side of the inner ring 42, so that the outer peripheral edge 51A of the bottom plate 51 is provided. And the notch step portion 48 can be sealed in a liquid-tight manner, and the O-ring 55 can prevent the lubricating oil G stored in the lubricating oil storage space 53 from leaking to the outside for a long time.

Next, FIGS. 4 and 5 show a second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals. The description is omitted.

The feature of the present embodiment is that the stopper 61 for clamping provided on the inner peripheral side of the round body 8 is provided with a bolt hole 6 fixed to the inner peripheral side of the round body 8 at intervals as shown in FIG.
And a plurality of bolts 63, 6 screwed into bolt holes 62A of the brackets 62 and having upper ends protruding upward from the round body 8.
3, ...

Here, each bracket 62 is formed to be bent in an L-shape, and each bolt hole 62A is formed vertically. Each bracket 62 is integrated with the inner peripheral side of the round body 8 by means such as welding. Also, each bolt 63
Is in contact with the outer peripheral edge 51A of the bottom plate 51 from below, and presses the outer peripheral edge 51A of the bottom plate 51 toward the notch step 48 of the inner race 42.

A nut 64 is screwed into the bolt 63 from above the bracket 62, and the outer peripheral edge 51 A of the bottom plate 51 is pressed against the notch step 48 of the inner race 42 by the upper end of the bolt 63. Each nut 64 is fastened to the upper surface of the bracket 62 so that each bolt 63
It is configured to stop locking.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, particularly, in the present embodiment, the upper end side of each bolt 63 is provided. The outer peripheral edge 51A of the bottom plate 51 is
The outer peripheral edge 51A of the bottom plate 51 can be sandwiched between the upper end of each bolt 63 and the notch step 48 of the inner race 42 by pressing against the notch step 48.

As a result, the entire grease bath 50 including the bottom plate 51 can be stably assembled to the inner race 42, and the screwing position of the bolt 63 with the bolt hole 62A of each bracket 62 can be adjusted, so that the bottom plate 51
Can be finely adjusted.

In each of the above embodiments, the seal groove 54 is formed on the outer peripheral edge 51A of the bottom plate 51, and the O-ring 55 is mounted in the seal groove 54.
Alternatively, for example, a seal groove may be formed on the lower surface 48A side of the notch step portion 48, and a seal member such as an O-ring may be mounted in the seal groove.

In each of the above embodiments, the turning wheel 41
The present invention has been described by taking as an example a three-row roller type swivel wheel 41 in which three sets of rollers 44, 45 and 46 serving as rolling elements are arranged between an inner ring 42 and an outer ring 43 of the present invention. Not only
For example, a configuration using an angular turning wheel or the like using a rolling element made of a steel ball or the like may be adopted.

Further, in each of the above embodiments, a large hydraulic excavator has been described as an example of a construction machine. However, the present invention is not limited to this. For example, a turning device such as a large hydraulic crane is provided. It can be widely applied to swiveling construction machines.

[0080]

As described in detail above, according to the first aspect of the present invention, since the lubricating oil accommodating space is formed between the inner ring and the cylindrical plate that is erected upward from the inner peripheral edge of the bottom plate, An annular notch step is provided on the inner peripheral side of the inner ring at a lower position of the internal gear, and a holding stopper for holding the bottom plate of the grease bus between the notch step and the lower traveling body side is provided. With this configuration, the bottom plate of the grease bath can be stably positioned on the inner peripheral side of the inner ring, and the distance from the bottom plate to the internal gear can be shortened.

Accordingly, the amount of lubricating oil to be accommodated in the grease bath can be reliably reduced, and the entire weight of the grease bath including the cylindrical plate can be effectively reduced. It is not necessary to perform welding or the like on the upper end side of the round body, which is easy, and it is possible to solve the problem that cracks occur due to the influence of residual stress and the like. Further, even when an external force such as a torsional force is applied to the inner ring of the turning wheel or the like during operation of the construction machine, the external force at this time has an adverse effect on the outer peripheral edge side of the bottom plate, for example, as a bending stress or a shear stress. Can be prevented, and the durability and life can be reliably improved.

Further, the bottom plate of the grease bath can be positioned on the inner peripheral side of the inner ring by using a simple structure in which the outer peripheral edge of the bottom plate is sandwiched between the notch step of the inner ring and the stopper. As in the prior art, fixing means such as bolts for fixing the bottom plate can be dispensed with, so that screw hole machining and the like can be eliminated, workability during assembly can be improved, and repair work and the like can be simplified.

According to the second aspect of the present invention, a stopper is provided on the inner peripheral side of the circular cylinder provided at the center of the track frame, and the stopper is located on the inner peripheral side of the circular cylinder and provided on the lower surface of the bottom plate. The upper edge of the stopper is abutted against the lower surface of the bottom plate, so that the outer peripheral edge of the bottom plate is strongly positioned between the upper edge of the stopper and the notch step of the inner ring. The bottom plate of the grease bath can be stably mounted on the inner peripheral side of the inner ring.

According to the third aspect of the present invention, a fastening member for fastening the inner ring is provided at the upper end side of the round body, and the stopper of the round body and the notch step of the inner ring are formed by the fastening force of the fastening member. Because it is configured to generate a clamping force that clamps the outer peripheral edge of the bottom plate, when assembling the inner ring on the upper end side of the round body,
The outer peripheral edge of the bottom plate is sandwiched between the stopper on the circular cylinder side and the notch step of the inner ring, and in this state, a clamping force for clamping the outer peripheral edge of the bottom plate can be provided by the fastening force of the fastening member. .

On the other hand, in the invention according to the fourth aspect, the outer peripheral edge of the bottom plate is pressed toward the notch step of the inner ring by using a plurality of stopper plates fixed to the inner peripheral side of the round body at intervals. Because the outer peripheral edge of the bottom plate can be pressed against the notch step of the inner ring at the upper end side of each stopper plate, the entire grease bath including the bottom plate is stably assembled to the inner ring. Can be attached.

In the invention according to the fifth aspect, since the stopper is constituted by the plurality of brackets and the plurality of bolts, the outer peripheral edge of the bottom plate abuts on the notch step of the inner ring at the upper end side of each bolt. , The outer peripheral edge of the bottom plate can be sandwiched between the upper end of each bolt and the notch step of the inner ring, and the entire grease bath including the bottom plate can be stably assembled to the inner ring. Then, by adjusting the screwing positions of the bolts with respect to the bolt holes of each bracket, the pinching force on the bottom plate can be finely adjusted appropriately, and the durability and life of the entire grease bath including the bottom plate can be improved.

In the invention according to the sixth aspect, nuts are fastened to the respective bolts, and the nuts are provided with the outer peripheral edge of the bottom plate pressed against the notch step of the inner ring. Since the locking is performed, the upper edge of each bolt presses the outer peripheral edge of the bottom plate against the notch step of the inner ring, and each nut can hold the bolt in the locking state. The durability and life of the entire grease bath including the grease can be further improved.

Further, in the invention according to claim 7, since the gap between the outer peripheral edge of the bottom plate and the notch step of the inner ring is sealed by a seal member, the lubricating oil accommodated in the lubricating oil accommodating space is provided. However, leakage to the outside from between the outer peripheral edge of the bottom plate and the inner peripheral side of the inner ring can be reliably prevented, and the sealing performance can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a turning device and the like of a hydraulic shovel according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a bottom plate and a cylindrical plate constituting the grease bath in FIG.

FIG. 3 is an exploded vertical sectional view showing the swivel device according to the first embodiment in an enlarged manner before a bottom plate is sandwiched between an inner race and a stopper plate.

FIG. 4 is a longitudinal sectional view showing a turning device and the like of a hydraulic shovel according to a second embodiment.

FIG. 5 is an exploded vertical cross-sectional view showing the turning device according to the second embodiment in an enlarged manner before a bottom plate is sandwiched between an inner ring and a stopper.

FIG. 6 is an external view showing a conventional hydraulic excavator.

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

8 is an enlarged longitudinal sectional view showing a turning device and the like in FIG. 7;

FIG. 9 is a longitudinal sectional view showing a turning device of a hydraulic shovel according to another related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Revolving frame 7 Track frame 8 Round body 14 Revolving device 17 Bolt (fastening member) 24 Reduction gear 25 Revolving motor 26 Pinion 41 Revolving wheel 42 Inner ring 43 Outer ring 44, 45, 46 Roller (Rolling) 47) Internal gear 48 Notch step 50 Grease bath 51 Bottom plate 51A Outer peripheral edge 51B Inner peripheral edge 52 Tubular plate 53 Lubricating oil storage space 54 Seal groove 55 O-ring (seal member) 56 Stopper plate (Stopper) 61 Stopper 62 Bracket 62A Bolt hole 63 Bolt 64 Nut G Lubricating oil

Claims (7)

[Claims] 1. An undercarriage, and an upper revolving body rotatably supported on the lower traveling body via a revolving device, wherein the revolving device includes an inner ring provided on the lower traveling body side,
An outer ring provided on the upper revolving body side and rotatably attached to the inner ring via a rolling element, and a pinion meshed with an internal gear formed on the inner peripheral side of the inner ring, and rotates the rotation motor. A speed reducer for turning that decelerates and transmits to the pinion;
In a revolving construction machine comprising a grease bus for storing lubricating oil supplied between a pinion of the speed reducer and an internal gear of the inner ring, the grease bus has an outer peripheral edge formed of the internal gear. An annular bottom plate that is positioned on the inner side of the inner ring at the lower side, and whose inner peripheral edge extends inward in the radial direction, and is erected upward from the inner peripheral edge side of the bottom plate, A cylindrical plate forming a lubricating oil accommodating space on a bottom plate between the inner ring and the inner ring. An annular notch step extending to the lower traveling body side, and a stopper for holding the outer peripheral edge of the bottom plate with the notch step is provided on the lower traveling body side. machine. 2. The vehicle according to claim 1, wherein the lower traveling body has a round body in a center portion of the track frame, and the stopper is provided on an inner peripheral side of the round body and protrudes upward toward a lower surface of the bottom plate. The swiveling construction machine according to claim 1. 3. A fastening member for fastening the inner ring is provided at an upper end side of the round body, and the bottom plate is provided between a stopper on the round body side and a notch step of the inner ring by a fastening force of the fastening member. The swiveling construction machine according to claim 2, wherein the rotating construction machine is configured to generate a clamping force for clamping an outer peripheral edge. 4. The stopper comprises a plurality of stopper plates fixed to the inner peripheral side of the round body at intervals, and each stopper plate has an upper end formed on the outer peripheral edge of the bottom plate at a notch step of the inner ring. The turning type construction machine according to claim 2, wherein the turning type construction machine is configured to be pressed toward the construction. 5. The stopper has a plurality of brackets having bolt holes fixed to the inner peripheral side of the round body at intervals, and is screwed into the bolt holes of each of the brackets, and the upper end is formed on the outer peripheral edge of the bottom plate. 4. A plurality of bolts pressed against the notch step of the inner ring. 5.
The swivel-type construction machine according to 1. 6. A structure in which nuts are fastened to the bolts, and the nuts lock the bolts in a state where the outer peripheral edge of the bottom plate is pressed against the notch step of the inner ring. The turning type construction machine according to claim 5, wherein 7. The swivel according to claim 1, wherein a seal member is provided at an outer peripheral edge portion of the bottom plate to seal a gap between the notch step portion of the inner race. Construction machinery.