JP2922817B2 - Swivel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hydraulic excavator,
The present invention relates to a swivel device which is provided in a construction machine such as a hydraulic crane and is preferably used to swing an upper swing body on a lower traveling body of the construction machine.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic shovel or a hydraulic crane generally includes a lower traveling body for traveling on a road surface and an upper revolving body provided with a working device and the like. By operating a turning device provided between the vehicle and the traveling body, a turning operation is performed on the lower traveling body.

[0003] FIGS. 7 and 8 show an example in which a conventional turning device is used for a hydraulic excavator.

In the drawing, reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 has a revolving frame 3; 3
A machine room 4, an operator's cab 5, a counterweight 6, and the like are provided above. Reference numeral 7 denotes a working device mounted on the revolving frame 3 so as to be able to move up and down, and the working device performs excavation work of earth and sand.

[0005] Reference numeral 8 denotes a turning device provided on the turning frame 3. As shown in FIG. 8, the turning device 8 is supplied with pressurized oil from the outside to rotate the output shaft 9 A. The turning device 8 transmits the rotation of the hydraulic motor 9 to the lower traveling body 1, and causes the turning frame 3 and the like to pivot with respect to the lower traveling body 1.

Reference numeral 10 denotes a housing constituting the main body of the turning device 8. The housing 10 has a small-diameter flange portion 11A formed at the upper end and a large-diameter flange portion 11B formed at the lower end, and a large-diameter flange portion. 11B is provided on the housing main body 11 fixed to the revolving frame 3, a small-diameter flange portion 11A of the housing main body 11, a ring gear 12 having an internal gear 12A formed on the inner peripheral side, and provided above the ring gear 12. And a cover 13 to which the hydraulic motor 9 is attached on the upper end side. Here, the housing main body 11 has an upper bearing 2, which will be described later,
7 is formed, a mounting step 11D to which the lower bearing 29 is mounted is formed below the inner periphery, and further, between each of the mounting steps 11C and 11D,
An attachment step 11E to which the oil seal 30 is attached is formed.

Reference numeral 14 denotes a reduction gear mechanism which is disposed below the cover 13 and is disposed in the housing 10 and constitutes a reduction mechanism together with the ring gear 12.
Consists of a first-stage planetary gear mechanism 15 and a second-stage planetary gear mechanism 20, which will be described later.
Thus, two-stage deceleration is performed.

Reference numeral 15 denotes a first-stage planetary gear mechanism. The planetary gear mechanism 15 includes a sun gear 16 spline-coupled to an output shaft 9A of the hydraulic motor 9, and an internal gear 12A of the sun gear 16 and the ring gear 12. , And revolve around the sun gear 16 while revolving around itself.
(Only one is shown) and a carrier 19 that rotatably supports each planetary gear 17 via a pin 18 and transmits the revolution of each planetary gear 17 to a sun gear 21 described later.

Reference numeral 20 denotes a second-stage planetary gear mechanism located below the first-stage planetary gear mechanism 14.
Is a sun gear 21 meshing with the internal gear of the carrier 19.
A plurality of planetary gears 22, 22,... (Only one is shown) meshing with the sun gear 21 and the internal gear 12A of the ring gear 12 and revolving around the sun gear 21 while rotating around the sun gear 21; 22 is rotatably supported via a pin 23, and the revolution of each of the planetary gears 22 is described below with a pinion shaft 25.
And a carrier 24 that transmits the power to the carrier.

Reference numeral 25 denotes an upper bearing 2 in the housing body 11.
7 and a pinion shaft as an output shaft rotatably supported via a lower bearing 29. The pinion shaft 25 has a small diameter portion 25A on the upper side and a large diameter portion 2 on the lower side.
5B. A spline 25C is formed on the outer periphery of the upper end side of the pinion shaft 25, and the spline 25C is spline-coupled to the carrier 24 described above.

Reference numeral 26 denotes a pinion provided at the lower end of the pinion shaft 25. The pinion 26 projects from the inside of the housing body 11 to the lower surface side of the turning frame 3, and has internal teeth of an inner ring 33 constituting a turning wheel 32 described later. 33A.

Reference numeral 27 denotes an upper bearing provided between the housing main body 11 and the small diameter portion 25A of the pinion shaft 25. The upper bearing 27 includes an outer ring fitted to the mounting step 11C of the housing main body 11, and a pinion. A tapered roller bearing including an inner ring fitted to the small diameter portion 25A of the shaft 25 and a plurality of tapered rollers disposed between the inner ring and the outer ring is used.

Reference numeral 28 denotes an annular retaining ring which is located between the carrier 24 of the planetary gear mechanism 20 and the upper bearing 27 and is fitted to the small diameter portion 25A of the pinion shaft 25. The retaining ring 28 is a pinion shaft. The positioning of the upper bearing 27 in the axial direction 25 is performed.

Reference numeral 29 denotes a large diameter portion 25B of the housing body 11 and the pinion shaft 25 which is located below the upper bearing 27.
And a lower bearing provided between the lower bearing 29 and the lower bearing 29.
Is composed of an outer ring fitted to the mounting step 11D of the housing body 11, an inner ring fitted to the large diameter portion 25B of the pinion shaft 25, and a plurality of tapered rollers disposed between the inner ring and the outer ring. Tapered roller bearings are used.

Reference numeral 30 denotes an upper bearing 2 in the housing body 11.
An oil seal provided in a space portion 31 formed between the lower gear 7 and the lower bearing 29. The oil seal 30 includes a lubricating oil for lubricating the planetary gear mechanisms 15 and 20 and the upper bearing 27 described above; The grease lubricating the lower bearing 29 is used to isolate the grease, which will be described later.
And the inner peripheral side is the large diameter portion 2 of the pinion shaft 25.
5B is brought into sliding contact with 5B in a liquid-tight manner with appropriate elasticity.

Reference numeral 32 denotes a turning wheel provided on the lower surface side of the turning frame 3. The turning wheel 32 includes an inner ring 33 provided on a round body 1 A provided at the center of the lower traveling body 1 and a turning wheel. An outer ring 34 fixed to the lower surface of the frame 3;
And a plurality of steel balls 35 (only one is shown) for smoothly rotating (turning) the outer ring 34 and the inner ring 33 between the inner ring 33 and the inner teeth 33 </ b> A of the inner ring 33. The above-mentioned pinion 26 is engaged.

Accordingly, the torque of the hydraulic motor 9 is transmitted to the pinion shaft 25 and the pinion 26 via the reduction gear mechanism 14.
The pinion 26 revolves around the inner periphery of the inner ring 33 while being engaged with the internal teeth 33A. Then, the revolving force is transmitted to the turning frame 3 via the housing 10 and the like, whereby the turning frame 3 performs a turning operation on the lower traveling body 1 via the turning wheel 32.

Reference numeral 36 denotes a cylindrical partition member located between the pinion 26 and the lower bearing 29 and fitted to the large-diameter portion 25B of the pinion shaft 25. A portion 36A is formed, and a small gap is formed between the outer peripheral edge of the enlarged diameter portion 36A and the inner peripheral surface on the lower end side of the housing body 11. The enlarged diameter portion 36 </ b> A of the partition member 36 is positioned above and below the lower bearing 29 and formed in the space portion 31 of the housing body 11 in the upper grease reservoir 37 and the lower grease reservoir 38. It serves to keep the grease filled in.

Reference numeral 39 denotes a grease bus provided on the inner peripheral side of the revolving wheel 32. The grease bus 39 is disposed on the inner peripheral surface of the round body 1A in a concave annular shape over the entire circumference. And
The grease bath 39 is filled with a gel-like lubricant such as grease, and this grease allows the pinion 26 and the inner ring 3 to be filled.
The meshing portion with the third internal teeth 33A is always lubricated.

The turning device 8 according to the prior art has the above-described configuration. When pressure oil is supplied to the hydraulic motor 9 from the outside, the output shaft 9A rotates, and this rotation is performed by the first stage planetary gear mechanism 15. Are transmitted from the sun gear 16 to each planetary gear 17, and each planetary gear 17 revolves while rotating around the inner periphery of the ring gear 12, and this revolving is performed by the sun gear of the second stage planetary gear mechanism 20 via the carrier 19. 21. Then, the rotation of the sun gear 21 causes each planetary gear 22 to revolve while rotating on the inner periphery of the ring gear 12, and this revolution is transmitted from the carrier 24 to the pinion shaft 25 via the spline 25 </ b> C. In this manner, the rotation of the hydraulic motor 9 is reduced by two steps by the reduction gear mechanism 14 including the planetary gear mechanisms 15 and 20, and the rotation of the pinion shaft 25 becomes high torque.
Conveyed to.

The rotation of the pinion shaft 25 causes the pinion 26 to revolve while rotating on the inner periphery of the revolving wheel 32, and the revolving is transmitted from the pinion shaft 25 to the revolving frame 3 via the housing body 11, The upper swing body 2 performs a swing operation on the lower traveling body 1.

[0022]

In the turning device 8 according to the prior art as described above, the lubricating oil sealed in the housing body 11 by the oil seal 30 is used.
Lubrication is performed on the meshing portion of each gear constituting the reduction gear mechanism 14 and the upper bearing 27, and the pinion 26 and the inner ring 33 are lubricated.
Lubrication for the meshing part with the internal teeth 33A
The lubrication of the lower bearing 29 is performed by the grease filled in the lower bearing 29 and the upper grease reservoir 37 formed above and below the lower bearing 29 in the space 31 of the housing body 11 and the lower grease. It is performed by grease filled in the storage chamber 38.

However, when the lower bearing 29 rotates together with the pinion shaft 25 during the operation of the turning device 8, the grease filled in the upper grease storage chamber 37 is displaced along the tapered rollers of the lower bearing 29. The grease flowing into the storage chamber 38 and gradually decreasing, and the grease filled in the lower grease storage chamber 38 is also disposed between the enlarged diameter portion 36A of the partition member 36 and the inner peripheral surface on the lower end side of the housing body 11. It leaks to the outside from the formed minute gap.

However, the filling and replacement of the grease into the turning device 8 is not normally performed until the overhaul of the hydraulic excavator.
7. If the amount of grease filled in the lower grease reservoir 38 gradually decreases and proper lubrication of the lower bearing 29 is not performed, the smooth rotation of the pinion shaft 25 is hindered, and the rotation device 8 is stabilized. A problem arises in that the operation cannot be compensated for a long time.

The present invention has been made in view of the above-mentioned problems of the prior art, and a swivel device capable of smoothly rotating a rotating shaft and constantly compensating stable operation for a long period of time by properly lubricating a bearing. The purpose is to provide.

[0026]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a housing having a lower end attached to an upper revolving body and a rotation source provided at an upper end, and provided in the housing. A deceleration mechanism for decelerating the rotation of the rotation source, an output shaft protruding downward from inside the housing, and outputting the rotation decelerated by the deceleration mechanism, provided on a lower end side of the output shaft, and A pinion that meshes with a revolving wheel that rotatably supports the upper revolving unit; and an upper and a lower rotatably supporting the output shaft in the housing.
Upper and lower bearings provided between the housing and the output shaft so as to be spaced downward, and lubricating oil for lubricating the speed reduction mechanism and lubricating portions of the pinion and the turning wheel in the housing. The present invention is applied to a swivel device including an oil seal provided in a space between the upper bearing and the lower bearing to isolate grease.

The first aspect of the present invention is characterized in that the lower end of the housing is provided with grease extruded from a meshing portion between the pinion and the revolving ring by the lower bearing and the oil seal. The grease introduction passage for introducing the grease into the grease storage chamber defined therebetween is provided.

In this case, at least one grease introduction passage may be provided in the vicinity of the meshing portion between the pinion and the turning wheel.

According to a third aspect of the present invention, at the lower end side of the housing, a grease receiving portion for receiving grease extruded from a meshing portion between the pinion and the turning wheel and guiding the grease to the grease introduction passage. It is desirable to provide a part.

Further, the grease receiving portion can be formed integrally with the housing by extending a lower end of the housing toward the turning wheel.

Further, it is preferable that a grease holding plate for holding grease to be introduced into the grease introduction passage be provided on the inner peripheral side of the grease receiving portion.

[0032]

According to the first aspect of the invention, the rotation of the rotation source is transmitted to the output shaft via the speed reduction mechanism, and the pinion provided at the lower end of the output shaft meshes with the rotation wheel to rotate the rotation wheel. As a result, the upper swing body performs a swing operation with respect to the lower swing body. At this time, the grease lubricating the meshing portion between the pinion and the slewing ring is pushed out by the meshing between the pinion and the slewing ring, and the grease is introduced into the housing through the grease introduction passage provided at the lower end of the housing. Since the grease is introduced into the grease chamber defined between the oil seal and the grease, the grease introduced into the grease chamber can always properly lubricate the lower bearing.

According to the second aspect of the invention, at least one grease extruded by the meshing of the pinion and the turning wheel is provided near the meshing portion of the pinion and the turning wheel. The grease is introduced into the grease chamber through the passage and lubricates the lower bearing.

According to the third aspect of the present invention, the grease extruded by the engagement between the pinion and the turning wheel is guided to the grease introduction passage by the grease receiving portion provided at the lower end of the housing, so that the grease is reliably provided. The grease is introduced into the grease reservoir via the introduction passage.

Further, according to the structure of the fourth aspect, the grease extruded by the engagement between the pinion and the turning wheel is guided to the grease introduction passage by the grease receiving portion formed integrally with the lower end of the housing.

According to the fifth aspect of the present invention, most of the grease extruded by the engagement between the pinion and the turning wheel is held by the grease holding plate provided on the inner peripheral side of the grease receiving portion. Thereafter, the grease is guided to the grease introduction passage by the grease receiving portion, and is introduced into the grease reservoir through the grease introduction passage, so that the lower bearing can be efficiently lubricated by the grease.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same components as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 to 3 show a first embodiment of the present invention.

In the figure, reference numeral 41 denotes a housing 1 according to the prior art.
0 shows a housing body applied to the present embodiment instead of the housing body 11 constituting the housing body 4.
Reference numeral 1 denotes a mounting step portion 41C in which a small-diameter flange portion 41A and a large-diameter flange portion 41B formed at upper and lower ends, respectively, and an outer ring of the upper bearing 27 are fitted in substantially the same manner as the housing body 11 described in the prior art. And a mounting step 41D to which the outer ring of the lower bearing 29 is fitted, and a mounting step 41E to which the outer peripheral side of the oil seal 30 is fixed, but which will be described later on the lower end side of the housing body 41. It differs from the prior art in that a grease introduction passage 42, a grease receiving portion 43, and the like are formed.

Reference numeral 42 denotes a grease introduction passage formed at the lower end of the housing body 41.
Is disposed almost directly above a meshing portion between the internal teeth 33A of the inner ring 33 constituting the turning wheel 32 and the pinion 26. The lower end side of the grease introduction passage 42 has the inner teeth 3 of the inner ring 33.
An opening is formed in the vicinity of a meshing portion between the pinion 3A and the pinion 26, and an upper end side is opened in an upper grease reservoir 37 defined between the lower bearing 29 and the oil seal 30. Therefore, the inner ring 33
The upper grease reservoir 37 and the vicinity of the meshing portion between the internal teeth 33A and the pinion 26 always communicate with each other via the grease introduction passage 42, and the grease held in the grease bath 39 is
The internal gear 33 </ b> A of the inner ring 33 meshes with the pinion 26 and is pushed out of the pinion 26 to form a grease introduction passage 42.
Through the upper grease reservoir 37.

Reference numeral 43 denotes a grease receiving portion integrally formed on the lower end side of the housing main body 41. The grease receiving portion 43 has a grease introduction passage 42 at the lower end side of the housing main body 41 as shown in FIGS. The formed portion is formed so as to protrude in an arc shape toward the turning wheel 32 (downward), and surrounds the meshing portion between the internal teeth 33A of the inner ring 33 and the pinion 26 from the outer peripheral side. Here, the grease receiving portion 43 is provided between the inner teeth 33A of the inner race 33 and the pinion 26.
And serves to guide the grease extruded by the engagement between the internal teeth 33A of the inner ring 33 and the pinion 26 into the grease introduction passage 42. The grease receiving portion 4 is provided inside the grease receiving portion 43.
3, a grease storage space 44 surrounded by the inner ring 33, the upper end surface of the pinion 26, and the lower bearing 29 is formed.

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

According to the present embodiment, however, the lower end of the housing body 41 in which the lower bearing 29 is fitted, the vicinity of the meshing portion between the pinion 26 and the internal teeth 33A of the inner ring 33 constituting the turning ring 32, and the lower portion Since the grease introduction passage 42 that is located above the side bearing 29 and communicates with the upper grease reservoir 37 formed in the housing main body 41 is provided, the following operation and effect can be obtained.

That is, when the pinion shaft 25 rotates during the operation of the turning device, the pinion 26 meshes with the internal teeth 33A of the inner race 33, so that the grease bath 39
The grease inside is extruded above the pinion 26 and is introduced into the upper grease reservoir 37 through the grease introduction passage 42 as shown by an arrow F in FIG. The grease introduced into the upper grease storage chamber 37 flows downward along the respective tapered rollers of the lower bearing 29 that revolves around the pinion shaft 25 while rotating around itself, and returns to the grease storage space 44. As described above, during operation of the turning device, the grease circulates through the circulation path including the grease storage space 44, the grease introduction passage 42, the upper grease storage chamber 37, and the like, so that the lower bearing 29 is always properly lubricated. be able to.

By providing the grease receiving portion 43 at the lower end side of the housing body 41, the grease pushed out of the pinion 26 by the engagement between the pinion 26 and the internal teeth 33A of the inner race 33 can be used. As a result, the amount of grease introduced into the upper grease reservoir 37 through the grease introduction passage 42 increases, and the lower bearing 29 can be efficiently lubricated. .

Further, the inner space 33 formed inside the grease receiving portion 43 is pushed out by the engagement between the internal teeth 33A of the inner ring 33 and the pinion 26, and collides with the lower end surface of the lower bearing 29 and the like. Since a part of the grease to be scattered is held, the grease held in the grease storage space 44 lubricates the lower bearing 29 and the lower bearing formed by the grease introduced into the upper grease storage 37 described above. Due to a synergistic effect with the lubrication action on the lower bearing 29, the lower bearing 29 can be more efficiently lubricated.

Furthermore, according to the present embodiment, the axial dimension of the large-diameter portion 25B of the pinion shaft 25 is reduced by eliminating the need for the partition member 36 used in the prior art swivel device 8. The side bearing 29 is configured to support the pinion shaft 25 near the pinion 26. Accordingly, the size and weight of the turning device can be reduced, and the force (meshing reaction) acting on the pinion shaft 25 in the direction of separating from the inner ring 33 due to the engagement of the pinion 26 and the internal teeth 33A of the inner ring 33. Force) can be reduced, and an excellent operational effect of extending the life of the lower bearing 29 can also be obtained.

Next, FIGS. 4 to 6 show a second embodiment according to the present invention.
Is shown. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 51 denotes a housing main body according to the present embodiment. The housing main body 51 has a small-diameter flange portion 51A, a large-diameter flange portion 51B, and a mounting step portion, similarly to the housing main body 41 of the first embodiment. 51C, 51D, 51E
And the like, but the housing body 51
A grease receiving portion 52 and the like, which will be described later, are formed all around the lower end side.

Reference numeral 52 denotes a grease receiving portion formed on the lower end side of the housing main body 51. The grease receiving portion 52 is formed so that the inner peripheral wall of the housing main body 51 into which the outer ring of the lower bearing 29 is fitted extends over the entire circumference. The inner teeth 33 </ b> A of the inner ring 33 projecting toward the pinion 26 (downward), and the protruding end thereof constitutes the turning wheel 32.
The pinion 26 is formed so as to extend to the vicinity of the meshing portion.

Reference numeral 53 denotes a substantially cylindrical spacer fitted to the pinion shaft 25 and interposed between the inner ring of the lower bearing 29 and the pinion 26.
A space for disposing a grease holding plate 54 to be described later is secured on the inner periphery of the lower end side of 1.

Numeral 54 denotes an annular grease holding plate which is disposed on the inner peripheral side of the grease receiving portion 52 and holds grease extruded from a meshing portion between the internal teeth 33A of the inner race 33 and the pinion 26. The holding plate 54 is connected to the housing body 5.
An annular engaging groove 5 formed over the entire inner circumference on the lower end side
A disk-shaped partition plate portion 54A whose outer peripheral side is engaged with 1F; a grease which extends toward the pinion 26 while reducing the diameter from the inner peripheral side of the partition plate portion 54A, and is opened on the pitch circumference of the pinion 26; And a circulation portion 54B, and is attached to the annular engagement groove 51F via a retaining ring 55 for a hole. A gap 54C is provided between the open end of the grease circulating portion 54B and the spacer 53 fitted to the pinion shaft 25.

Reference numeral 56 denotes a grease storage space formed on the inner peripheral side of the grease receiving portion 52. The grease storage space 56
It is formed as an annular space surrounded by the inner peripheral surface of the grease receiving portion 52, the lower end surface of the lower bearing 29, the spacer 53, the grease holding plate 54, and the like. And the inner ring 33
The grease extruded from the meshing portion between the internal teeth 33A and the pinion 26 is introduced into the grease storage space 56 through the gap 54C, and is held in the grease storage space 56 by the grease holding plate 54.

Are a plurality of grease introduction passages provided at the lower end side of the housing body 51. Each of the grease introduction passages 57 is fitted with an outer ring of the lower bearing 29 as shown in FIG. It is provided at equal intervals on the lower end side inner periphery of the housing main body 51, and a part of the inner teeth 33 </ b> A of the inner race 33 is provided.
The other portion is disposed near the meshing portion between the pinion 26 and the other portion, at a portion (non-meshing portion) separated from the meshing portion between the internal teeth 33A of the inner race 33 and the pinion 26. The lower end of each grease introduction passage 57 opens to the grease storage space 56, and the upper end opens to the upper grease storage chamber 37 defined between the lower bearing 29 and the oil seal 30.

The turning apparatus according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that according to the first embodiment.

According to the present embodiment, however, a grease receiving portion 52 is provided at the lower end of the housing body 51 over the entire periphery thereof, and a grease holding plate 54 is provided on the inner peripheral side of the grease receiving portion 52. In addition, since a plurality of grease introduction passages 57 for communicating the upper grease storage chamber 37 and the grease storage space 56 are provided on the inner periphery on the lower end side of the housing body 51, the following operation and effect can be obtained.

That is, when the pinion shaft 25 rotates during the operation of the turning device, the grease extruded by the engagement between the pinion 26 and the internal teeth 33A of the inner race 33 is introduced into the grease storage space 56 through the gap 54C, and the grease is discharged. It is held in the grease storage space 56 by the holding plate 54. At this time, since the grease receiving portion 52 and the grease holding plate 54 are provided on the lower end side of the housing body 51 over the entire circumference, the internal teeth 3 of the pinion 26 and the inner ring 33 are provided.
Most of the grease extruded by engagement with 3A can be held in the grease storage space 56.

The grease sequentially introduced into the grease storage space 56 by the engagement of the pinion 26 with the internal teeth 33A of the inner ring 33 due to the rotation of the pinion shaft 25 as shown by an arrow G in FIG. The grease is introduced into the upper grease reservoir 37 via a grease introduction passage 57 provided near the meshing portion between the pinion 26 and the internal teeth 33A of the inner ring 33. The grease introduced into the upper grease reservoir 37 flows downward along each tapered roller of the lower bearing 29 that revolves while rotating around the pinion shaft 25, and lubricates the lower bearing 29. Reflux into the grease storage space 56.

At this time, most of the grease returned from the upper grease storage chamber 37 into the grease storage space 56 via the lower bearing 29 is formed by the grease holding plate 54 and the spacer 53 as shown by an arrow H in FIG. Is discharged into the grease bath 39 through the gap 54C between the
As shown by an arrow I in FIG. 5, a part of the grease that has flowed back into the grease introduction passage 57 provided at a portion separated from the meshing portion between the pinion 26 and the internal teeth 33A of the inner ring 33.
The lubricating oil is introduced into the upper grease storage chamber 37 through the lower bearing 29, and is again provided for lubrication of the lower bearing 29. Thus, a grease circulation path including the grease storage space 56, the respective grease introduction passages 57, the upper grease storage chamber 37, and the like is formed, and the lower bearing 29 can be efficiently lubricated by the grease flowing through the circulation path. it can.

As described above, according to the present embodiment, the grease receiving portion 52 formed on the entire periphery of the lower end side of the housing body 51,
A grease holding plate 5 provided on the inner peripheral side of the grease receiving portion 52
By forming the grease storage space 56 from 4 and the like,
Most of the grease extruded by the engagement between the pinion 26 and the internal teeth 33 </ b> A of the inner ring 33 can be held in the grease storage space 56. And the grease storage space 56
The grease held in the grease is introduced into the upper grease reservoir 37 through the respective grease introduction passages 57 in large quantities.
Lubrication of the lower bearing 29 with grease introduced into the upper grease reservoir 37 can be performed more efficiently.

Further, the inner teeth 3 of the pinion 26 and the inner ring 33
By providing the grease introduction passage 57 also at a portion separated from the meshing portion with the 3A, a part of the grease that has flowed back from the upper grease storage chamber 37 into the grease storage space 56 can be transferred through the grease introduction passage 57 to the upper grease. The lubrication of the lower bearing 29 can be performed more efficiently because the lubrication of the lower bearing 29 can be performed because the lubrication of the lower bearing 29 can be performed again by being introduced into the storage chamber 37.

In the first embodiment, the housing body 4
Although a case where the grease receiving portion 43 is integrally formed on the lower end side of the first example is described as an example, and a case where the grease receiving portion 52 is integrally formed on the lower end side of the housing main body 51 is described in the second embodiment, The present invention is not limited to this, and a separate grease receiving portion may be fixed to the lower end side of the housing body.

In each of the above embodiments, the turning device having the two-speed reduction gear mechanism 14 has been described as an example. However, the present invention is not limited to this, and the present invention is not limited to this. May be used for the turning device having the reduction gear mechanism.

Further, in each of the above embodiments, the case where the turning device is used for a hydraulic excavator has been described as an example. However, the present invention is not limited to this, and may be used as a turning device for a hydraulic crane and other construction machines. Can be.

[0065]

As described above in detail, according to the first aspect of the present invention, a grease introduction passage is provided at the lower end side of the housing, and the grease reservoir defined between the oil seal and the lower bearing in the housing. And the meshing portion between the pinion and the turning wheel is configured to communicate with each other through the grease introduction passage, so that the grease extruded from the meshing portion between the pinion and the turning wheel is always supplied through the grease introduction passage. It can be introduced into the grease reservoir. Therefore, the lower bearing is always properly lubricated by the grease introduced into the grease reservoir, so that the output shaft can always be smoothly rotated, and stable operation can be compensated for a long time.

According to the second aspect of the present invention, by providing the grease introduction passage near the meshing portion between the pinion and the turning wheel, the grease pushed out from the meshing portion between the pinion and the turning wheel can be reliably greased. The grease can be introduced into the grease reservoir via the introduction passage.

According to the third aspect of the present invention, grease extruded from the meshing portion between the pinion and the turning wheel is received,
By providing a grease receiving portion for guiding the grease to the grease introduction passage at the lower end side of the housing, the amount of grease introduced into the grease reservoir through the grease introduction passage increases, so that the grease is introduced into the grease reservoir. Lubrication of the lower bearing with grease can be performed efficiently.

According to the fourth aspect of the present invention, the grease receiving portion is formed integrally with the lower end side of the housing body, so that the positioning of the grease receiving portion with respect to the meshing portion between the pinion and the turning wheel can be performed reliably. it can.

Further, according to the fifth aspect of the present invention, a grease holding plate for holding grease to be introduced into the grease introduction passage is provided on the inner peripheral side of the grease receiving portion, so that the pinion and the turning wheel can be connected to each other. Most of the grease extruded from the engagement portion is held by the grease holding plate and can be reliably introduced into the grease chamber through the grease introduction passage, so that the amount of grease introduced into the grease chamber increases. Thus, lubrication of the lower bearing with the grease can be performed more efficiently.

[Brief description of the drawings]

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

FIG. 2 is a partially broken longitudinal sectional view showing a lower bearing, a grease receiving portion, a grease introduction passage and the like in FIG. 1 in an enlarged manner.

FIG. 3 is a cross-sectional view as seen from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a turning device according to a second embodiment of the present invention.

5 is an enlarged longitudinal sectional view of the same position as FIG. 2 showing a lower bearing, a grease receiving portion, a grease introduction passage and the like in FIG. 4;

6 is a cross-sectional view as seen from the direction of arrows VI-VI in FIG. 5;

FIG. 7 is an external view showing a conventional hydraulic excavator.

FIG. 8 is a longitudinal sectional view showing a conventional turning device.

[Explanation of symbols]

 Reference Signs List 9 hydraulic motor (rotation source) 10 housing 14 reduction gear mechanism (reduction mechanism) 25 pinion shaft (output shaft) 26 pinion 27 upper bearing 29 lower bearing 30 oil seal 31 space 32 swirl ring 37 upper grease reservoir (grease reservoir) Chamber) 41, 51 Housing body 42, 57 Grease introduction passage 43, 52 Grease receiving portion 54 Grease holding plate

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yuji Igawa 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Engineering Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) E02F 9/12 E02F 9/00

Claims (5)

(57) [Claims] 1. A housing having a lower end attached to an upper revolving structure and a rotation source provided on an upper end, a reduction mechanism provided in the housing and reducing the rotation of the rotation source,
An output shaft projecting downward from the housing and outputting rotation reduced by the speed reduction mechanism; and a slewing wheel provided at a lower end side of the output shaft and supporting the upper slewing body to be able to swivel with respect to the lower traveling body. An upper and lower bearing provided between the housing and the output shaft so as to be rotatably supported within the housing and rotatably supporting the output shaft in the housing; In order to isolate the lubricating oil for lubricating the speed reduction mechanism and the grease for lubricating the meshing portion between the pinion and the turning wheel, the lubricating oil is provided in a space between the upper bearing and the lower bearing. In a swivel device including an oil seal, grease extruded from a meshing portion between the pinion and the swivel wheel is provided at a lower end side of the housing with a grease reservoir defined between the lower bearing and the oil seal. A swivel device having a grease introduction passage for introducing the grease into the chamber. 2. The turning device according to claim 1, wherein at least one grease introduction passage is provided near a meshing portion between the pinion and the turning wheel. 3. A grease receiving portion is provided at a lower end side of the housing for receiving grease extruded from a meshing portion between the pinion and the turning wheel and guiding the grease to the grease introduction passage. 3. The turning device according to 2. 4. The turning device according to claim 3, wherein the grease receiving portion is formed integrally with the housing by extending a lower end side of the housing toward the turning wheel. 5. The turning device according to claim 3, wherein a grease holding plate for holding grease to be introduced into the grease introduction passage is provided on an inner peripheral side of the grease receiving portion.