Tracked walking device of machine tool

Abstract

The tracked traveling device of the machine tool includes tracks, a track frame, a rotating mechanism, a support mechanism, and a floating seal. The track frame includes a housing section and a mounting section. The mounting section extends from the inner surface of the housing section. The rotating mechanism includes a rotating body wound around the track. The rotating mechanism is disposed on the outer side of the mounting section in the axial direction of the rotating body. The support mechanism rotatably supports the rotating mechanism. At least a portion of the support mechanism is disposed within the internal space of the housing section. The support mechanism is mounted on the mounting section. The floating seal seals the space between the rotating mechanism and the support mechanism. The support mechanism includes a sealing cover. The sealing cover covers the floating seal from the inner side in the axial direction. The sealing cover is disposed on the inner side of the mounting section in the axial direction.

Description

Technical Field

[0001] This invention relates to a tracked walking device for machine tools. Background Technology

[0002] Machine tools include those equipped with tracked walking devices. For example, in the machine tool of Patent Document 1, the tracked walking device includes tracks, sprockets, a housing, a reducer, a travel motor, and a track frame. The tracks are wound around the sprockets. The travel motor is connected to the sprockets via the reducer. The housing is mounted on the track frame. The travel motor and the reducer are disposed inside the housing and the track frame and supported by the housing.

[0003] In addition, the tracked walking device features a floating seal. The floating seal is positioned between the sprocket and the housing. This seal effectively prevents foreign objects such as sand from entering the housing.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-178963 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] The aforementioned floating seals can sometimes fail due to wear. In such cases, it is necessary to disassemble the tracked drive system to replace the floating seal. Specifically, first, cut the track and remove it from the sprocket. Next, disassemble the reducer and remove it from the housing. Then, replace the floating seal.

[0009] Therefore, in conventional tracked walking devices, replacing the floating seal requires disassembling the entire device and removing the tracks, sprockets, reducers, etc., which is a cumbersome process. The purpose of this invention is to make the replacement of the floating seal in a tracked walking device easier.

[0010] Technical solutions for solving technical problems

[0011] The tracked traveling device of this disclosed machine includes a track, a track frame, a rotating mechanism, a support mechanism, and a floating seal. The track frame supports the track. The track frame includes a housing section and a mounting section. The housing section has an internal space. The mounting section extends from the inner surface of the housing section. The rotating mechanism includes a rotating body that winds around the track. The rotating mechanism is disposed outside the mounting section in the axial direction of the rotating body. The support mechanism rotatably supports the rotating mechanism. At least a portion of the support mechanism is disposed in the internal space. The support mechanism is mounted on the mounting section. The floating seal seals the area between the rotating mechanism and the support mechanism. The support mechanism includes a sealing cover. The sealing cover covers the floating seal from the inside in the axial direction. The sealing cover is disposed inside the mounting section in the axial direction.

[0012] In the tracked walking device of the present invention, the floating seal can be accessed by removing the sealing cover from the support mechanism. Furthermore, the sealing cover is disposed inside the mounting portion in the axial direction. Therefore, the sealing cover can be removed from the inside of the mounting portion without disassembling the rotating mechanism disposed outside the mounting portion. Thus, the floating seal can be easily replaced by removing the sealing cover without disassembling the track and the rotating mechanism.

[0013] Invention Effects

[0014] According to this disclosure, the replacement of floating seals in tracked walking devices becomes easy. Attached Figure Description

[0015] Figure 1 It is a side view of the machine.

[0016] Figure 2 It is a top view of the machine.

[0017] Figure 3 yes Figure 1 Section II-II in the diagram.

[0018] Figure 4 This is a perspective view of the tracked walking device with the inner cover removed, viewed from the inside along the axis.

[0019] Figure 5 This is a side view of the tracked walking device with the inner cover removed, viewed from the inside along the axis.

[0020] Figure 6 This is an enlarged view showing the structure near the floating seal.

[0021] Figure 7 This is a side view of the tracked walking device with the inner cover and sealing cover removed, viewed from the inside along the axial direction. Detailed Implementation

[0022] Hereinafter, the tracked walking device of the machine tool according to the embodiments will be described with reference to the accompanying drawings. Figure 1 This is a side view of the machine tool 1 in the embodiment. Figure 2 This is a top view of the working machine 1. In this embodiment, the working machine 1 is an excavator such as a hydraulic excavator or an electric excavator.

[0023] like Figure 1 and Figure 2 As shown, the working machine 1 includes a working device 3, a rotating body 4, and a pair of left and right tracked traveling devices 5 and 6. The working device 3 is mounted on the rotating body 4 in an operable manner. The working device 3 includes a boom 11, a forearm 12, and a bucket 13. The boom 11 is rotatably mounted relative to the rotating body 4. The forearm 12 is rotatably mounted relative to the boom 11. The bucket 13 is rotatably mounted relative to the forearm 12.

[0024] The tracked traveling device 5 includes a first rotating mechanism 21, a second rotating mechanism 22, a track 23, and a track frame 24. The track frame 24 supports the track 23 via a plurality of rollers 25. It should be noted that in the accompanying drawings, only one of the plurality of rollers 25 is labeled with reference numeral 25, and the reference numerals for the other rollers 25 are omitted.

[0025] The first rotating mechanism 21 includes a first rotating body 26. The second rotating mechanism 22 includes a second rotating body 27. In this embodiment, the first rotating body 26 is a sprocket, and the second rotating body 27 is an idler wheel. A track 23 is wound around the first rotating body 26 and the second rotating body 27. Although not shown in the figure, the track 23 includes a plurality of track plates interconnected. The working machine 1 moves by driving the track 23.

[0026] Figure 3 yes Figure 1 Section III-III in the diagram. Figure 3 As shown, the first rotating mechanism 21 includes a first hole 28. The first hole 28 extends along the axial direction of the first rotating body 26. Figure 2 As shown, the axis Ax1 of the first rotating body 26 extends along the left-right direction of the working machine 1. That is, the axial direction of the first rotating body 26 is consistent with the left-right direction of the working machine 1. The axial direction of the first rotating body 26 is the same as the axial direction of the left and right tracked walking devices 5 and 6.

[0027] The tracked traveling device 5 includes a support mechanism 30. The support mechanism 30 is fixed to the track frame 24. A portion of the support mechanism 30 is disposed within a first hole 28. The support mechanism 30 supports the first rotating mechanism 21 so that it can rotate. The support mechanism 30 includes a support shaft 31, a traveling motor 32, and a sealing cover 33. The support shaft 31 is disposed within the first hole 28 of the first rotating mechanism 21. The support shaft 31 extends along the axial direction of the first rotating body 26. The support shaft 31 is coaxially disposed with the first rotating body 26. Bearings 34 and 35 are disposed between the outer peripheral surface of the support shaft 31 and the inner peripheral surface of the first hole 28. The support shaft 31 supports the first rotating mechanism 21 so that it can rotate via the bearings 34 and 35. The support shaft 31 includes a second hole 36. The second hole 36 extends along the axial direction.

[0028] The travel motor 32 is disposed within the second hole 36 of the support shaft 31. The travel motor 32 rotates the first rotating mechanism 21. The travel motor 32 is, for example, an electric motor. Alternatively, the travel motor 32 may also be a hydraulic motor. The travel motor 32 includes a drive shaft 37 and a motor housing 38. The drive shaft 37 extends along its axial direction. The drive shaft 37 is coaxially configured with the first rotating body 26. The drive shaft 37 is connected to the first rotating mechanism 21. The motor housing 38 supports the drive shaft 37. The sealing cover 33 will be described in detail later.

[0029] The first rotating mechanism 21 includes a final reducer 41, a rotating body housing 42, and a boss 43. The final reducer 41 is connected to the drive shaft 37. The final reducer 41 reduces the rotation of the drive shaft 37 and transmits it to the first rotating body 26. The final reducer 41 includes a first reducer 44, a second reducer 45, and a third reducer 46. The first reducer 44, the second reducer 45, and the third reducer 46 may include, for example, a planetary gear mechanism. However, the first reducer 44, the second reducer 45, and the third reducer 46 may also include a reduction mechanism other than a planetary gear mechanism. It should be noted that in Figure 3 The simplified diagram shows the first reducer 44, the second reducer 45, and the third reducer 46.

[0030] The first reducer 44 and the second reducer 45 are disposed within the second hole 36 of the support shaft 31. The first reducer 44 is positioned axially outside the travel motor 32. The first reducer 44 is connected to the drive shaft 37. The second reducer 45 is positioned axially outside the first reducer 44. The second reducer 45 is connected to the first reducer 44. The third reducer 46 is positioned axially outside the second reducer 45. The third reducer 46 is positioned axially outside the support shaft 31. The third reducer 46 is connected to the second reducer 45.

[0031] The rotating housing 42 is disposed outside the first rotating body 26 in the axial direction. The rotating housing 42 is connected to the first rotating body 26. The third reducer 46 is disposed inside the rotating housing 42. The third reducer 46 is supported by the rotating housing 42. The final reducer 41 transmits the rotation of the drive shaft 37 to the rotating housing 42. The rotating housing 42 is connected to the first rotating body 26. The rotating housing 42 and the first rotating body 26 rotate integrally. The first rotating body 26 rotates as the rotating housing 42 rotates.

[0032] The boss 43 is disposed on the inner side of the first rotating body 26 in the axial direction. The boss 43 is connected to the first rotating body 26. The boss 43 and the first rotating body 26 rotate integrally. The aforementioned first hole 28 is provided inside the first rotating body 26, the rotating body housing 42, and the boss 43. The first hole 28 is filled with lubricating oil.

[0033] The track frame 24 includes a storage section 51 and a mounting section 52. The storage section 51 is disposed inside the first rotating body 26 in the axial direction. The storage section 51 has an internal space S1. A portion of the support mechanism 30 is disposed within the internal space S1 of the storage section 51. At least a portion of the travel motor 32 is disposed within the internal space S1 of the storage section 51. The storage section 51 includes a wall section 53 and an inner cover 54. Figure 4 This is a perspective view of the tracked walking device 5 with the inner cover 54 removed, viewed from the inside along the axial direction. Figure 5 This is a side view of the tracked walking device 5 with the inner cover 54 removed, viewed from the inside along the axial direction.

[0034] like Figure 4 and Figure 5 As shown, wall portion 53 covers the interior space S1 in the front-to-back and top-to-bottom directions. Wall portion 53 includes a first wall portion 55 and a second wall portion 56. The first wall portion 55 has a curved plate-like shape. The first wall portion 55 is disposed at the rear, above, and below the interior space S1. The second wall portion 56 is disposed at the front of the interior space S1. The second wall portion 56 includes a hole 57. A cable 58 connected to the travel motor 32 passes through the hole 57.

[0035] like Figure 3 As shown, the inner cover 54 is disposed on the inner side of the internal space S1 along the axial direction. The inner cover 54 has a plate-like shape extending in the vertical and horizontal directions and the front-back direction. The inner cover 54 is detachably mounted to the wall portion 53. For example, the inner cover 54 is mounted to the wall portion 53 by bolts 59 and 60.

[0036] Mounting portion 52 extends from the inner surface of wall portion 53 in both vertical and longitudinal directions. Mounting portion 52 has a plate-like shape. Mounting portion 52 is fixed to wall portion 53. For example, mounting portion 52 is fixed to wall portion 53 by welding. Mounting portion 52 is disposed inside the first rotating body 26 in the axial direction. That is, the first rotating body 26 is disposed outside the mounting portion 52 in the axial direction. Mounting portion 52 includes a first opening 61. The boss 43 of the aforementioned support mechanism 30 and the first rotating mechanism 21 extends through the first opening 61. Support mechanism 30 is mounted on mounting portion 52.

[0037] The tracked traveling device 5 includes a floating seal 62. The floating seal 62 is disposed axially between the first rotating mechanism 21 and the support mechanism 30. The floating seal 62 seals the space between the first rotating mechanism 21 and the support mechanism 30. Specifically, the floating seal 62 is disposed between the boss 43 and the sealing cover 33. The floating seal 62 has an outer diameter smaller than the first opening 61 of the mounting portion 52. At least a portion of the floating seal 62 is located inside the mounting portion 52 in the axial direction. The support shaft 31 has an outer diameter smaller than the floating seal 62. The support shaft 31 is disposed radially inside the floating seal 62.

[0038] Figure 6 This is an enlarged view showing the construction near the floating seal 62. (See attached image.) Figure 6 As shown, the floating seal 62 includes a first seal 63 and a second seal 64. The first seal 63 is mounted on the boss 43. The second seal 64 is mounted on the sealing cover 33. Specifically, a first recess 65 is provided at the end of the boss 43 on the inner side in the axial direction. The first seal 63 is mounted on the first recess 65. A second recess 66 is provided in the sealing cover 33. The second seal 64 is mounted on the second recess 66.

[0039] The first seal 63 includes a first O-ring 67 and a first metal sealing ring 68. The second seal 64 includes a second O-ring 69 and a second metal sealing ring 70. The first metal sealing ring 68 and the second metal sealing ring 70 are tightly fitted together by the elastic force of the first O-ring 67 and the second O-ring 69. Therefore, when the first rotating body 26 rotates, the first metal sealing ring 68 and the second metal sealing ring 70 are tightly fitted and slide within the floating seal 62. Thus, the first rotating mechanism 21 is supported by the support mechanism 30 to enable rotation, and foreign objects such as sand are prevented from passing between the support mechanism 30 and the first rotating mechanism 21 and intruding.

[0040] The first rotating mechanism 21 includes a flange 71. The flange 71 extends radially outward from the boss 43 toward the first rotating mechanism 21. The flange 71 is axially opposite to the mounting portion 52 from the outside of the mounting portion 52. The flange 71 forms a labyrinth structure between the boss 43 and the mounting portion 52. This further suppresses the intrusion of foreign objects such as sand between the support mechanism 30 and the first rotating mechanism 21.

[0041] The aforementioned sealing cover 33 is disposed inside the floating seal 62 in the axial direction. The floating seal 62 is disposed between the boss 43 and the sealing cover 33 in the axial direction. The sealing cover 33 covers the floating seal 62 from the inside in the axial direction. The sealing cover 33 has an outer diameter larger than the first opening 61 of the mounting portion 52. The sealing cover 33 is disposed inside the mounting portion 52 in the axial direction. The sealing cover 33 is mounted to the mounting portion 52 in a detachable manner. The sealing cover 33 is mounted to the mounting portion 52 by a plurality of first bolts 72. It should be noted that in the drawings, only one of the plurality of first bolts 72 is labeled with reference numeral 72, and the reference numerals for the other first bolts 72 are omitted.

[0042] The sealing cover 33 is separate from the support shaft 31. The sealing cover 33 is disposed axially inside the support shaft 31. The sealing cover 33 is detachably mounted to the support shaft 31. The sealing cover 33 is also disposed axially inside the motor housing 38. The sealing cover 33 is detachably mounted to the motor housing 38. The sealing cover 33 is mounted to the support shaft 31 and the motor housing 38 by a plurality of shared second bolts 73. It should be noted that in the accompanying drawings, only one of the plurality of second bolts 73 is labeled with reference numeral 73, and the reference numerals for the other second bolts 73 are omitted.

[0043] like Figure 5 As shown, the sealing cover 33 has an annular shape. The sealing cover 33 includes a second opening 74. (As indicated...) Figure 3 As shown, the travel motor 32 protrudes into the internal space S1 of the track frame 24 through the second opening 74. Figure 5 and Figure 6 As shown, the sealing cover 33 includes an outer diameter portion 75, an inner diameter portion 76, and a middle portion 77. The outer diameter portion 75 is located radially outward from the floating seal 62. The inner diameter portion 76 is located radially inward from the floating seal 62. The middle portion 77 is located radially between the outer diameter portion 75 and the inner diameter portion 76.

[0044] The sealing cover 33 is mounted on the mounting portion 52 at the outer diameter portion 75. For example... Figure 6As shown, a bolt hole 78 is provided in the outer diameter portion 75. A bolt hole 79 is provided in the mounting portion 52. The outer diameter portion 75 is mounted to the mounting portion 52 using a first bolt 72 that passes through the bolt hole 78 in the outer diameter portion 75 and the bolt hole 79 in the mounting portion 52. The first bolt 72 is inserted into the bolt hole 78 in the outer diameter portion 75 and the bolt hole 79 in the mounting portion 52 from the inside of the sealing cover 33 in the axial direction.

[0045] The sealing cover 33 is mounted on the support shaft 31 at its inner diameter portion 76. A bolt hole 81 is provided in the inner diameter portion 76. A bolt hole 82 is provided in the support shaft 31. A bolt hole 83 is provided in the motor housing 38. The inner diameter portion 76 is mounted on the support shaft 31 using a second bolt 73 that passes through the bolt holes 81 in the inner diameter portion 76, 83 in the motor housing 38, and 82 in the support shaft 31. The second bolt 73 is inserted axially from the inside of the sealing cover 33 into the bolt holes 81 in the inner diameter portion 76, 83 in the motor housing 38, and 82 in the support shaft 31.

[0046] In the tracked walking device 5 described above in this embodiment, when replacing the floating seal 62, firstly, as follows: Figure 4 and Figure 5 As shown, the inner cover 54 is removed from the track frame 24. This allows access to the sealing cover 33 from the inside of the track frame 24. Next, the sealing cover 33 is removed from the mounting portion 52 and the support shaft 31. Thus, as... Figure 7 As shown, the floating seal 62 is exposed and can be accessed from the inside of the track frame 24. Therefore, the floating seal 62 can be easily replaced without cutting the track 23 or removing the first rotating mechanism 21 from the outside of the track frame 24. It should be noted that the structure of the tracked walking device 6 is the same as that of the tracked walking device 5, so detailed description is omitted.

[0047] The present invention has been described above as an embodiment of the invention, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

[0048] The working machinery 1 is not limited to an excavator, but can also be other machinery such as a bulldozer or a dump truck. The structure of the first rotating mechanism 21 is not limited to the above-described embodiment and can be modified. For example, the number of reducers is not limited to 3. The number of reducers can be less than 3 or more than 3. The first rotating body 26 is not limited to a sprocket, but can also be an idler wheel. The above-described floating seal 62 and sealing cover 33 structure can also be applied to the second rotating mechanism 22.

[0049] Industrial availability

[0050] According to this disclosure, the replacement of floating seals in tracked walking devices becomes easy.

[0051] Explanation of reference numerals in the attached figures

[0052] 1: Working machinery; 5: Tracked walking device; 21: First rotating mechanism; 23: Track; 26: First rotating body; 24: Track frame; 30: Support mechanism; 31: Support shaft; 32: Walking motor; 33: Sealing cover; 37: Drive shaft; 38: Motor housing; 43: Boss; 51: Storage part; 52: Mounting part; 61: First opening; 62: Floating seal; 71: Flange part; 75: Outer diameter part; 76: Inner diameter part; Ax1: Axis.

Claims

1. A tracked walking device, which is a tracked walking device for working machinery, comprising: track; A track frame includes a storage section with an internal space and a mounting section extending from the inner surface of the storage section to support the track; A rotating mechanism, comprising a rotating body for winding around the track, disposed on the outside of the mounting portion in the axial direction of the rotating body; A support mechanism, at least a portion of which is disposed within the internal space, mounted on the mounting portion, and rotatably supports the rotating mechanism; and A floating seal that seals the space between the rotating mechanism and the supporting mechanism. The support mechanism includes a sealing cover that covers the floating seal from the inside of the floating seal in the axial direction. The sealing cover is disposed inside the mounting portion in the axial direction.

2. The tracked walking device according to claim 1, The sealing cover is installed on the mounting part in a detachable manner.

3. The tracked walking device according to claim 1, The mounting portion includes an opening. The rotating mechanism includes a boss extending from the rotating body through the opening toward the inside in the axial direction.

4. The tracked walking device according to claim 3, The floating seal is disposed between the boss and the sealing cover.

5. The tracked walking device according to claim 3, The sealing cover has an outer diameter larger than the opening.

6. The tracked walking device according to claim 3, The floating seal has an outer diameter smaller than the opening.

7. The tracked walking device according to claim 3, The rotating mechanism includes a flange portion extending radially from the boss along the rotating mechanism. The flange portion is opposite to the mounting portion from the outside of the mounting portion in the axial direction.

8. The tracked walking device according to claim 1, The support mechanism includes a support shaft disposed within the rotating mechanism and rotatably supporting the rotating mechanism. The sealing cover is disposed inside the support shaft in the axial direction.

9. The tracked walking device according to claim 8, The sealing cover is installed on the support shaft in a detachable manner.

10. The tracked walking device according to claim 8, The support shaft has a smaller outer diameter than the floating seal.

11. The tracked walking device according to claim 8, The sealing cover includes: The outer diameter portion is located radially outward from the floating seal; as well as The inner diameter portion is located radially inward compared to the floating seal. The sealing cover is installed on the mounting part at the outer diameter portion and on the support shaft at the inner diameter portion.

12. The tracked walking device according to claim 8, The support mechanism includes a walking motor disposed within the internal space of the storage section. The walking motor includes a drive shaft connected to the rotating mechanism and a motor housing supporting the drive shaft. The sealing cover is disposed inside the motor housing in the axial direction.

13. The tracked walking device according to claim 12, The sealing cover is installed in a detachable manner on the motor housing.

14. The tracked walking device according to claim 13, The sealing cover connects the support shaft and the motor housing with bolts and is installed on the support shaft and the motor housing.

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