JP2010013805A - Revolving device of construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a revolving device of construction machinery capable of supplying grease to a second bearing for holding a revolving output shaft without causing contamination of equipment and members around a housing due to grease. <P>SOLUTION: In this revolving device of the construction machinery, a grease supply part for supplying grease to the second bearing 8 for holding a part being remote from a planetary reduction gear part 3 of the revolving output shaft 4 is composed of a pipe passage part provided on the revolving output shaft 4 and having a first opening opened in an end part of the revolving output shaft 4 at one end and a second opening for supplying grease to the second bearing 8 at the other end and a grease nipple 16 attached to the first opening in the pipe passage part. The pipe passage part is composed of a first pipe passage 18 extended in the direction of shaft axis of the revolving output shaft 4 and having a first opening 17 and a second pipe passage 20 communicating with the first pipe passage 18, extended in the direction crossing the direction of shaft axis of the revolving output shaft 4, and having a second opening 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a turning device for a construction machine having a bearing box that is provided in a construction machine having a turning body such as a hydraulic excavator or a crane and holds a turning output shaft.

  FIG. 6 is a side view showing a hydraulic excavator cited as an example of a construction machine. As shown in FIG. 6, the excavator 60 includes a traveling body 61, a revolving body 63 disposed on the traveling body 61 via a revolving wheel 62, and the revolving body 63 can be rotated in the vertical direction. And a work machine 64 that performs excavation work and the like. A driver's cab 65 is provided at a front position of the revolving structure 63. Further, a turning device 66 for turning the turning body 63 by engaging with the turning wheel 62 is provided.

  As a conventional technique of the above-described swivel device 66, there is one disclosed in Patent Document 1, for example. FIG. 7 is a cross-sectional view of a main part showing a conventional turning device shown in Patent Document 1. As shown in FIG.

  The output of the hydraulic motor 67, which is a component of the turning device 66, is transmitted from the motor output shaft 68 to the planetary reduction mechanism unit 69, and is decelerated and increased in torque and transmitted to the turning output shaft 70. The rotation of the turning output shaft 70 is transmitted to the turning of the turning body 63 via the turning wheel 62.

  The hydraulic motor 67 and the upper surface portion of the ring gear 71 are coupled to each other. The ring gear 71 and the upper surface portion of the housing 72 are coupled to each other. The housing 72 is coupled to the revolving structure 63 at the flange portion 73.

  The planetary reduction mechanism 69 is composed of a two-stage planetary reduction mechanism. The output of the hydraulic motor 67 is transmitted to the first-stage sun gear 74 by the motor output shaft 68, and the planetary gear 75 is a ring gear formed integrally with the housing 72. 71 and revolving while rotating between the sun gear 74. The revolution of the planetary gear 75 is transmitted as the rotation of the second stage sun gear 77 through the carrier 76 that supports the planetary gear 75, and the planetary gear 78 rotates between the ring gear 71 and the sun gear 77 while rotating around. Do. The revolution of the planetary gear 78 is transmitted to the turning output shaft 70 of the bearing housing 80 via the carrier 79 that supports the planetary gear 78.

  A first bearing 81 that is attached to the housing 72 and holds a portion of the turning output shaft 70 close to the planetary speed reduction mechanism 69, and a second bearing 81 that is attached to the housing 72 and holds the portion of the turning output shaft 70 far from the planetary speed reduction mechanism 69. The turning output shaft 70 is rotatably supported by the bearing 82. The first bearing 81 and the second bearing 82 are self-aligning roller bearings.

  An oil seal 83 for sealing gear oil is disposed between the first bearing 81 and the second bearing 82. The planetary reduction mechanism 69 and the first bearing 81 are lubricated with gear oil. The second bearing 82 is lubricated with grease filled between the inner and outer.

  The housing 72 is provided with a grease supply conduit 84 whose end on the grease supply side opens on the surface of the housing 72, and a grease nipple 85 is attached to the opening of the grease supply conduit 84. ing. The grease supply pipe 84 and the grease nipple 85 constitute a grease supply section that supplies grease to the second bearing 82.

  The housing 72 is provided with a gear oil discharge conduit 86, and the gear oil discharge conduit 86 is provided with a stop valve 87.

The above-described second bearing 82 is provided with a grease seal 88 and is sealed by the grease seal 88 so that the grease does not leak. Further, an annular plate 90 is disposed between the second bearing 81 and the output gear 89 of the turning output shaft 70. This plate 90 is used to reduce the intrusion of grease and foreign matter into the turning device 66 due to the engagement between the output gear 89 of the turning output shaft 70 and the turning wheel 62, and to prevent the leakage of the grease that lubricates the second bearing 82. Is provided. Grease is used to lubricate the meshing portion of the output gear 89 and the swivel wheel 62, and the traveling body 61 is provided with a grease bus 91. In addition, Patent Documents 2 and 3 disclose a swing device having a configuration substantially equivalent to that of the swing device 66 described above.
Japanese Patent No. 3565775 JP 2000-110197 A JP 2006-207184 A

  In the conventional techniques shown in Patent Documents 1 to 3 described above, for example, the conventional technique shown in Patent Document 1, the end portion of the grease supply pipe 84 that supplies the grease to the second bearing 82 opens to the surface of the housing 72. Since the grease nipple 85 is attached to the opening, there is a concern that when the grease is supplied through the grease nipple 85, the grease leaks and the devices and members around the housing 72 are contaminated with the grease. When contamination due to such grease occurs, it is necessary to remove complicated contamination grease on the devices and members around the housing 72.

  The present invention has been made from the actual situation in the above-described prior art, and an object of the present invention is to supply grease to the second bearing holding the turning output shaft without causing contamination of the equipment and members around the housing by grease. It is to provide a swivel device for a construction machine.

  To achieve this object, a swivel device for a construction machine according to the present invention is provided in a construction machine having a swivel body, and includes a hydraulic motor, a planetary reduction mechanism connected to the hydraulic motor, and the planetary reduction mechanism. A turning output shaft that is rotated by a portion, and a bearing box that holds the turning output shaft. The bearing box is attached to the housing and is a portion of the turning output shaft that is close to the planetary reduction mechanism portion. A first bearing that holds the second rotation bearing, a second bearing that holds a portion of the turning output shaft far from the planetary reduction mechanism, an oil seal that seals between the first bearing and the second bearing, and the first A grease supply unit that supplies grease to the two bearings, and in the turning device of the construction machine that turns the turning body by the rotation of the turning output shaft driven by the hydraulic motor, the grease supply unit includes: A pipe line portion provided on the turning output shaft, having a first opening that opens at one end of the turning output shaft at one end, and a second opening that can supply grease to the second bearing at the other end; It comprises a grease nipple attached to the first opening of the pipe line part, and is characterized in that grease for lubricating the second bearing is supplied from the grease nipple through the pipe line part.

  In the present invention configured as described above, when supplying the grease to the second bearing holding the turning output shaft, the grease is supplied from the grease nipple attached to the first opening at the end of the turning output shaft. Even if the grease leaks from the grease nipple during the supply of the grease, the leaked grease can be kept in the housing in which the turning output shaft is accommodated. That is, grease at the time of supplying grease does not leak to the surface side of the housing. Therefore, grease can be supplied to the second bearing without causing contamination of the equipment and members around the housing with grease.

  Further, in the construction machine turning device according to the present invention, in the above invention, the pipe section extends in the axial direction of the turning output shaft, and the first pipe having the first opening, It is characterized by comprising a second pipe line that communicates with one pipe line and extends in a direction intersecting the axial center direction of the turning output shaft and has the second opening.

  Further, in the above-described invention, the swivel device for the construction machine according to the present invention is configured such that the first opening of the first conduit is formed at an end portion of the swivel output shaft that is located on the far side from the planetary reduction mechanism. It is characterized by that.

  Further, in the above-described invention, the swivel device for the construction machine according to the present invention is configured such that the first opening of the first pipe line is formed at an end portion of the swivel output shaft that is located on the side closer to the planetary reduction mechanism. It is characterized by that.

  The turning device for a construction machine according to the present invention is characterized in that, in the above invention, a recess is formed at the end of the turning output shaft, and the first opening is formed at the bottom of the recess. In the present invention configured as described above, even when the grease is leaked from the grease nipple when the grease is supplied to the second bearing, the leaked grease is retained in the recess formed at the end of the turning output shaft. I can keep it.

  The turning device for a construction machine according to the present invention includes a grease supply unit that is provided in a bearing box and that supplies grease to a second bearing that holds the turning bearing, and the end of the turning output shaft is provided at one end. A pipe portion having a first opening that is open at the other end and a second opening that can supply grease to the second bearing at the other end, and a grease nipple attached to the first opening of the pipe portion. Therefore, even when grease leaks from the grease nipple when supplying grease to the second bearing, the leaked grease can be retained in the housing that accommodates the turning output shaft. The grease can be supplied to the second bearing without causing contamination of the equipment and members by grease. This eliminates the need for troublesome removal of contaminated grease on the devices and members around the housing as in the prior art.

  Hereinafter, the best mode for carrying out a turning device for a construction machine according to the present invention will be described with reference to the drawings.

  Each embodiment described below is also provided in a hydraulic excavator exemplified as an example of a construction machine, for example, similarly to the swivel device 66 shown in FIG. 6 described above. Therefore, description will be made using the reference numerals shown in FIG. 6 as necessary.

  FIG. 1 is a longitudinal sectional view of an essential part showing a first embodiment of a construction machine turning device according to the present invention. The swivel device 1 according to the first embodiment shown in FIG. 1 has a hydraulic motor 2 at the top, and a planetary reduction mechanism that engages with the motor output shaft of the hydraulic motor 2 below the hydraulic motor 2. 3, and a bearing box 5 that holds a turning output shaft 4 that is rotated by the planetary reduction mechanism unit 3 below the planetary reduction mechanism unit 3.

  The bearing box 5 includes a housing 6 that forms an outer shell and is fixed to the swivel body 63, and a portion of the housing 6 that is mounted on the housing 6 and that is close to the planetary reduction mechanism unit 3 of the swivel output shaft 4. A first bearing 7 to be held, a second bearing 8 that holds a portion of the turning output shaft 4 far from the planetary speed reduction mechanism 3, and an oil seal 9 that seals between the first bearing 7 and the second bearing 8. And are arranged.

  Further, in the housing 6, a nut 10 that can be screwed into the turning output shaft 4 to press the first bearing 7, that is, can apply preload to the first bearing 7 and the second bearing 8, is housed. A plate 11 is disposed at the lower end of the housing 6 to prevent the grease supplied to the second bearing 8 from leaking to the outside and preventing foreign matter from entering the housing 6 from the outside. A lip seal 13 is disposed between the annular groove 12 formed in the shape 6.

  The traveling body 61 is provided with a grease bus 14 in which grease is accommodated, and the internal gear of the turning wheel 62 interposed between the traveling body 61 and the turning body 63 meshes with the output gear 15 of the turning output shaft 4. Thus, the swivel device 1 is fixed to the swivel body 4.

  In the swivel device 1 according to the first embodiment, a grease supply unit that supplies grease to the second bearing 8 has a first opening that opens at one end of the swivel output shaft 4 at one end, and a second at the other end. It consists of a pipe line portion having a second opening capable of supplying grease to the bearing 8 and a grease nipple 16 attached to the first opening of the pipe line portion.

  The above-described pipe line portion extends, for example, in the axial center direction of the turning output shaft 4 and communicates with the first pipe line 18 having the first opening 17 and the first pipe line 18. The second pipe 20 has a second opening 19 that extends in a direction crossing the axial direction. The first opening 17 of the first pipe line 18 is formed in the bottom surface 21 </ b> A of the recess 21 provided at the end portion of the turning output shaft 4 located on the side far from the planetary speed reduction mechanism portion 3.

  FIG. 2 is a cross-sectional view of a principal part showing a state at the time of supplying grease in the first embodiment shown in FIG. As shown in FIG. 2, the operation of supplying grease to the second bearing 8 is performed simultaneously with the operation of applying a preload to the first bearing 7 and the second bearing 8 by rotating the nut 10, for example. .

  When the preload is applied to the first bearing 7 and the second bearing 8, the output gear 15 of the turning output shaft 4 is held unrotatable by the output shaft stopper 22, and the pin 25 at the lower end of the arm portion 24 of the housing rotating shaft 23. The pin 29 at the lower end of the socket 28 attached to the lower end of the nut rotating shaft 27 is inserted into the hole 30 of the nut 10. . In this state, the nut rotation shaft 27 is rotated in the direction in which the first bearing 7 is tightened, and the housing rotation shaft 23 is rotated in the direction opposite to the nut rotation shaft 27 to detect the torque of the housing 6. When it is detected that the torque of the housing 6 has reached a predetermined value, the nut 10 has applied a preload having a desired value to the first bearing 7 and the second bearing 8.

  When supplying the grease to the second bearing 8, for example, the tip nozzle 31 provided in a grease feeder (not shown) is attached to the grease nipple 16, and the preloading operation to the first bearing 7 and the second bearing 8 is performed. During this period, grease is supplied. The grease discharged from the tip nozzle 31 is guided to the first pipeline 18 and further to the second pipeline 20 communicating with the first pipeline 18, and the second opening 19 of the second pipeline 20. To the second bearing 8.

  The turning output shaft 4 is rotated via the planetary reduction mechanism 3 by the drive of the hydraulic motor 2, and is arranged on the traveling body 61 through the meshing between the output gear 15 of the turning output shaft 4 and the turning wheel 62. The swivel body 63 is turned.

  According to the swivel device 1 according to the first embodiment configured as described above, when supplying grease to the second bearing 8 that holds the swivel output shaft 4, the first opening 17 at the end of the swivel output shaft 4. Since the grease is supplied from the grease nipple 16 attached to the housing, even if the grease is leaked from the grease nipple 16 during the supply of the grease, the leaked grease is kept in the housing 6 in which the turning output shaft 4 is accommodated. I can leave. That is, grease at the time of supplying grease does not leak to the surface side of the housing 6. Therefore, the grease can be supplied to the second bearing 8 without causing contamination of the equipment and members around the housing 6 with grease, and the complicated work of removing the contaminated grease on the equipment and members around the housing 6 is unnecessary. It becomes.

  In particular, the recess 21 is formed at the lower end of the turning output shaft 4, and the first opening 17 of the first pipe line 18 is formed on the bottom surface 21 </ b> A of the recess 21. Even when grease leaks from the grease nipple 16 during supply, the leaked grease can be retained in the recess 21 formed at the end of the turning output shaft 4.

  In the first embodiment, the operation of supplying grease to the second bearing 8 is performed during the operation of applying the preload to the first bearing 7 and the second bearing 8 by rotating the nut 10. The grease supply operation can be performed without increasing the work time required for the production of the bearing box 5, that is, the production of the swivel device 1, and the production work efficiency of the swivel device 1 can be improved.

  FIG. 3 is a cross-sectional view of an essential part showing a second embodiment of the present invention. Also in the swivel device 32 according to the second embodiment, the pipe line portion constituting the grease supply portion extends in the axial direction of the swivel output shaft 34 accommodated in the housing 6 of the bearing box 33, and the first opening A first pipeline 36 having a first passage 36, and a second pipeline 38 communicating with the first pipeline 36 and extending in a direction intersecting the axial direction of the turning output shaft 34 and having a second opening 37. Consists of. Unlike the first embodiment, the first opening 35 of the first conduit 36 is formed at an end portion of the turning output shaft 34 located on the side closer to the planetary speed reduction mechanism unit 3. Other configurations are the same as those of the first embodiment described above.

  Also in the second embodiment, when the hydraulic motor 39 is driven, the turning output shaft 34 is rotated via the planetary reduction mechanism unit 3, and the vehicle travels through the engagement between the output gear 40 of the turning output shaft 34 and the turning wheel 62. The revolving structure 63 arranged on the body 61 revolves.

  FIG. 4 is a longitudinal sectional view showing a state when supplying grease in the second embodiment shown in FIG. Also in the second embodiment, for example, as shown in FIG. 4, the grease supply operation to the second bearing 8 is performed simultaneously with the operation of rotating the nut 10 to apply the preload to the first bearing 7 and the second bearing 8. To do.

  When preload is applied to the first bearing 7 and the second bearing 8, as in the first embodiment, the tip of the pin 25 at the lower end of the arm portion 24 of the housing rotating shaft 23 is formed in the screw hole formed in the housing 6. The screw is engaged with the portion 26 so that the pin 42 at the lower end of the cylindrical nut rotating shaft 41 is inserted into the hole 30 of the nut 10. In this state, the nut rotation shaft 41 is rotated in the direction in which the first bearing 7 is tightened, and the housing rotation shaft 23 is rotated in the direction opposite to the nut rotation shaft 41 to detect the torque of the housing 6. When it is detected that the torque of the housing 6 has reached a predetermined value, the nut 10 has applied a preload having a desired value to the first bearing 7 and the second bearing 8.

  When supplying the grease of the second bearing 8, for example, the tip nozzle 31 provided in a grease supply unit (not shown) and inserted into the nut rotating shaft 41 is attached to the grease nipple 16, and the first bearing 7 described above is provided. The grease is supplied during the preload application operation to the second bearing 8. The grease discharged from the tip nozzle 31 is guided to the first pipeline 36 and further to the second pipeline 38 communicating with the first pipeline 36, and the second opening 37 of the second pipeline 38. To the second bearing 8.

  Similarly to the first embodiment, in the second embodiment configured as described above, when supplying grease to the second bearing 8 that holds the turning output shaft 34, the first opening at the end of the turning output shaft 34 is also provided. Since the grease is supplied from the grease nipple 16 attached to 35, even if the grease leaks from the grease nipple 16 during the supply of the grease, the leaked grease is retained in the housing 6 in which the turning output shaft 34 is accommodated. I can keep it. That is, grease at the time of supplying grease does not leak to the surface side of the housing 6. Therefore, the grease can be supplied to the second bearing 8 without causing contamination of the equipment and members around the housing 6 with grease, and the complicated work of removing the contaminated grease on the equipment and members around the housing 6 is unnecessary. It becomes.

  Also, in the second embodiment, as in the first embodiment, grease is supplied to the second bearing 8 during the operation of rotating the nut 10 to apply preload to the first bearing 7 and the second bearing 8. Therefore, the grease supply operation can be performed without increasing the work time required for the manufacture of the bearing box 33, that is, the manufacture of the turning device 32, and the manufacturing work efficiency of the turning device 32 can be improved. Can do.

  FIG. 5 is a longitudinal sectional view of an essential part showing a third embodiment of the present invention. In the third embodiment, the first opening 47 of the first pipe 46 constituting the pipe part is formed on the bottom surface 44 </ b> A of the recess 44 formed at the upper end of the turning output shaft 43. Other configurations are the same as those of the second embodiment described above.

  Similarly to the second embodiment, the swivel device 48 according to the third embodiment also has a pipe line portion that constitutes a grease supply section in the axial direction of the swivel output shaft 43 accommodated in the housing 6 of the bearing box 49. A first pipe 46 having a first opening 47, a first pipe 46 communicating with the first pipe 46, and extending in a direction intersecting the axial direction of the turning output shaft 43, and the second opening 50. And a second pipe line 51 having The first opening 47 of the first conduit 46 is formed in the bottom surface 44 </ b> A of the concave portion 44 provided at the end portion of the turning output shaft 43 located on the side close to the planetary speed reduction mechanism portion 3.

  Even in the third embodiment, when the hydraulic motor 51 is driven, the turning output shaft 43 is rotated via the planetary reduction mechanism unit 3, and the output gear 52 and the turning wheel 62 of the turning output shaft 43 are engaged with each other. The turning body 63 disposed on the traveling body 61 turns.

  The third embodiment has the same effects as the second embodiment, and further, a recess 44 is formed at the upper end of the turning output shaft 43, and the first pipe 46 is connected to the bottom surface 44 </ b> A of the recess 44. Since the one opening 47 is formed, even when the grease is leaked from the grease nipple 16 when supplying the grease to the second bearing 8, the leaked grease is formed in the end portion of the turning output shaft 43. 44 can be retained.

It is a principal part longitudinal cross-sectional view which shows 1st Embodiment of the turning apparatus of the construction machine which concerns on this invention. It is principal part sectional drawing which shows the state at the time of the grease supply in 1st Embodiment shown in FIG. It is principal part sectional drawing which shows 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of the grease supply in 2nd Embodiment shown in FIG. It is a principal part longitudinal cross-sectional view which shows 3rd Embodiment of this invention. It is a side view which shows the hydraulic shovel mentioned as an example of a construction machine. It is a principal part longitudinal cross-sectional view which shows the conventional turning apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turning apparatus 2 Hydraulic motor 3 Planetary speed reduction mechanism part 4 Turning output shaft 5 Bearing box 6 Housing 7 1st bearing 8 2nd bearing 9 Oil seal 15 Output gear 16 Grease nipple [grease supply part]
17 1st opening 18 1st pipe line (pipe part) [grease supply part]
19 2nd opening 20 2nd pipe line (pipe part) [grease supply part]
31 Nozzle tip 32 Swivel device 33 Bearing box 34 Swivel output shaft 35 First opening 36 First pipe (pipe section) [grease supply section]
37 2nd opening 38 2nd pipe line (pipe part) [grease supply part]
39 Hydraulic motor 40 Output gear 43 Turning output shaft 44 Recess 44A Bottom surface 46 First pipe (pipe section) [grease supply section]
47 1st opening 48 slewing device 49 bearing box 50 2nd opening 51 2nd pipe line (pipe part) [grease supply part]
52 Output gear

Claims (5)

Provided in a construction machine having a rotating body,
A hydraulic motor, a planetary reduction mechanism connected to the hydraulic motor, a turning output shaft that rotates by the planetary reduction mechanism, and a bearing box that holds the turning output shaft;
The bearing box has a housing, a first bearing that is mounted on the housing and holds a portion of the turning output shaft that is close to the planetary speed reduction mechanism, and a portion of the turning output shaft that is far from the planetary speed reduction mechanism. A second bearing, an oil seal that seals between the first bearing and the second bearing, and a grease supply unit that supplies grease to the second bearing,
In a turning device for a construction machine for turning the turning body by rotation of the turning output shaft driven by the hydraulic motor,
The grease supply section
A pipe line portion provided on the turning output shaft, having a first opening that opens at one end of the turning output shaft at one end, and a second opening capable of supplying grease to the second bearing at the other end;
Consisting of a grease nipple attached to the first opening of the pipe section,
A swiveling device for a construction machine, characterized in that grease for lubricating the second bearing is supplied from the grease nipple through the conduit portion. The swivel device for a construction machine according to claim 1,
The pipe portion extends in the axial center direction of the turning output shaft, communicates with the first pipe passage having the first opening, and the axial direction of the turning output shaft. A swiveling device for a construction machine, comprising: a second pipe line extending in an intersecting direction and having the second opening. The swivel device for a construction machine according to claim 2,
The swivel device for a construction machine, wherein the first opening of the first pipe line is formed at an end portion of the swivel output shaft that is located on the far side from the planetary speed reduction mechanism. The swivel device for a construction machine according to claim 2,
The swivel device for a construction machine, wherein the first opening of the first pipe line is formed at an end portion of the swivel output shaft that is located on a side closer to the planetary speed reduction mechanism. The swivel device for a construction machine according to claim 3 or 4,
A turning device for a construction machine, wherein the recess of the turning output shaft is formed at the end of the turning output shaft, and the first opening is formed at the bottom of the recess.

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