JP2014231339A - Travel device for crawler vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly lubricate a splined part between a support member and a carrier in the last stage.SOLUTION: On the axial direction one side of a rotary shaft 39, there provided a male spline on the rotation source side 39A1 which is splined to a driven gear 27 of a speed reduction mechanism 23 and a male spline on the oil reservoir space side 39A2 which extends in an oil reservoir space 21. On a fitting flange contact surface 48B of a nut member 48 that is screwed with a male screw 47F of a carrier 47 in the last stage, a plurality of oil passages 49 is provided. By this, a lubricant 52 stored in the oil reservoir space 21 is scooped up by a male spline on the oil reservoir space side 39A2 of the rotary shaft 39, and attached to an end surface 14C of a fitting flange 14 of a support member 12. This oil drop 52A flows down along the end surface 14C onto the outer peripheral surface of the nut member 48, and then, is supplied via the oil passages 49 of the nut member 48 to a splined part between the support member 12 and the carrier 47.

Description

  The present invention relates to a traveling apparatus for a tracked vehicle including an endless crawler track (crawler) such as a hydraulic excavator or a hydraulic crane.

  Generally, a tracked vehicle such as a hydraulic excavator or a hydraulic crane has a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front side of the upper revolving body. It is roughly constituted by a working device provided so as to be able to move up and down.

  Here, a traveling device for a tracked vehicle according to the prior art is usually a cylindrical support in which a female spline portion is formed on the inner peripheral side, which is fixed to one side of the front and rear sides of the side frame constituting the track frame. A member, a rotation source attached to the support member, an oil sump space formed between the support member and the rotation source, and a crawler for traveling that is rotatably supported on the outer peripheral side of the support member via a bearing. A drum having a meshing sprocket attached thereto, a rotating shaft inserted in the axial direction of the support member between the rotation source and the drum, and a planetary gear provided in the drum for reducing the rotation of the rotating shaft and transmitting it to the drum And a speed reduction mechanism.

  The final stage carrier of the planetary gear reduction mechanism includes a small-diameter cylindrical portion fitted on the inner peripheral side of the support member, and a gear that is provided on the other axial side of the cylindrical portion and rotatably supports the planetary gear. A male spline portion that is located on one side in the axial direction and is splined to the female spline portion of the support member, and a shaft further than the male spline portion. An external thread portion that is located on one side in the direction and faces the oil sump space is provided. Then, a nut member is screwed onto the male screw portion of the last stage carrier, and by tightening this nut member, the bearing that supports the drum is pivoted between the support member and the gear support portion of the last stage carrier. It can position in a direction (refer patent document 1).

Japanese Utility Model Publication No. 61-139876

  By the way, in the traveling device according to the prior art, the cylindrical portion of the carrier of the final stage constituting the planetary gear reduction mechanism is splined to the cylindrical body of the support member fixed to the track frame, so that the planetary gear reduction mechanism The reduced rotation is transmitted to the drum. Therefore, since the reaction force when the drum is rotated always acts on the spline connecting portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage, the spline connecting portion is lubricated with lubricating oil. There is a need.

  In a traveling device according to the prior art, the height position of the level of the lubricating oil for lubricating the planetary gear reduction mechanism is normally set to the position of the axis that is the rotation center of the drum. For this reason, lubricating oil cannot be supplied to the part of the spline coupling portion between the cylindrical body of the support member and the cylindrical portion of the carrier at the final stage, which is above the drum axis.

  Accordingly, the female spline provided in the cylindrical body of the support member and a part of the male spline provided in the cylindrical portion of the carrier in the final stage (part higher than the axis of the drum) remain engaged with each other without any lubricating oil. In addition, the vibration is caused by the vibration caused by the rotational reaction force of the drum and the vibration caused by the traveling of the hydraulic excavator. As a result, there is a problem that the female spline provided in the cylindrical body of the support member and / or the male spline provided in the cylindrical portion of the carrier of the last stage causes fretting wear and the life thereof is reduced.

  The present invention has been made in view of the above-described problems of the prior art, and can properly lubricate the spline coupling portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage, and can extend its life. An object of the present invention is to provide a traveling apparatus for a tracked vehicle.

  In order to solve the above-described problems, the present invention provides a support member that has a cylindrical body that extends in the axial direction and a mounting flange that is provided on one axial side of the cylindrical body and is fixed to a track frame of a tracked vehicle. A rotation source mounted on the mounting flange of the support member, an oil sump space formed between the rotation source and the mounting flange of the support member, and one axial side is the outer peripheral side of the cylindrical body of the support member A drum that is rotatably supported via a bearing and has a covered cylindrical shape that is closed on the other side in the axial direction by a lid, and a sprocket that meshes with a crawler track for traveling on the outer peripheral side; and the rotation source A rotating shaft that is inserted between the drum in the axial direction of the support member, one side in the axial direction is splined to the rotation source, and the other side in the axial direction is supported by the lid of the drum, and in the drum Provided said times A planetary gear reduction mechanism of one or more stages for reducing the rotation of the shaft and transmitting it to the drum; and a lubricating oil stored in the oil reservoir space and the drum; On the circumferential side, a female spline portion is provided on one side in the axial direction, and the carrier of the final stage of the planetary gear reduction mechanism is a small-diameter cylindrical portion fitted in the cylindrical body of the support member, and the cylinder Formed on the other side in the axial direction of the portion, and a gear support portion that rotatably supports the planetary gear. The outer peripheral side of the cylindrical portion of the carrier of the final stage is positioned on one side in the axial direction and the support A male spline portion splined to the female spline portion of the member, and a male screw portion provided on the outer peripheral side of the cylindrical portion and positioned in the axial direction further than the male spline portion and facing the oil sump space The last stage carrier male And a nut member for axially positioning the bearing between the support member and the gear support portion of the carrier of the final stage, and the nut member and a mounting flange of the support member, In the meantime, the present invention is applied to a traveling device for a track type vehicle in which a rotation stopping member for stopping rotation of the nut member screwed into the male screw portion of the last stage carrier is provided.

  A feature of the configuration adopted by the invention of claim 1 is that a male spline portion provided on one side in the axial direction of the rotating shaft includes a rotation source side male spline portion that is splined to the rotation source, and the rotation An oil reservoir space-side male spline portion extending from the source-side male spline portion into the oil sump space and scooping up the lubricating oil stored in the oil sump space, of the nut member; On the side of the mounting flange contact surface that contacts the mounting flange, the lubricating oil scraped up by the male spline portion on the oil sump space side receives the female spline portion of the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage. An oil passage for supplying a spline coupling portion between the female spline portion and the female spline portion is provided.

  According to a second aspect of the present invention, the cylindrical portion of the carrier of the final stage is provided with a vent hole that is located in the vicinity of the other axial side of the male spline portion and communicates the inner peripheral side and the outer peripheral side of the cylindrical portion. There is a configuration to provide.

  According to a third aspect of the present invention, four or more oil passages are provided at a constant angle in the circumferential direction of the mounting flange contact surface of the nut member.

  According to a fourth aspect of the present invention, the mounting flange of the support member is provided with a recessed portion that is recessed toward the female spline portion of the cylindrical body, and the recessed portion is reduced in diameter from the oil sump space in a tapered shape. It is comprised by the inclined surface and the nut contact surface which is located in the innermost part of this inclined surface, and the attachment flange contact surface of the said nut member contacts.

  According to a fifth aspect of the present invention, the mounting flange of the support member is lubricated by the male spline portion on the oil reservoir space side of the rotating shaft above the nut member and positioned in the oil reservoir space. An oil guide plate for guiding oil to the oil passage of the nut member is provided.

  According to the first aspect of the present invention, when the rotation source is actuated to rotate the rotation shaft, the oil sump space side male extending into the oil sump space in the male spline portion provided on one side in the axial direction of the rotation shaft. The lubricating oil stored in the oil sump space is scraped up by the spline portion. This lubricating oil becomes oil droplets and adheres to the end face located in the oil sump space of the mounting flange of the support member, and flows down to the outer peripheral face of the nut member along this end face. Then, the oil droplets flowing down to the outer peripheral surface of the nut member pass through the oil passage provided on the mounting flange contact surface side of the nut member and the female spline portion provided on the cylindrical body of the support member and the carrier 47 of the final stage. It is supplied to a spline coupling part between the male spline part provided in the cylindrical part.

  Accordingly, the lubricating oil can be sufficiently supplied also to the portion located above the drum axis in the spline connecting portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage. As a result, the spline coupling portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage can be properly lubricated over the entire circumference, and the life of the support member and the carrier can be extended. The reliability of the entire traveling device can be improved.

  According to the invention of claim 2, even when the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage are fitted with no gap, air on the outer peripheral side of the cylindrical portion is allowed to pass through the vent hole to the inner periphery of the cylindrical portion. Can be pulled out to the side. As a result, the lubricating oil can be supplied not only to the vicinity of the nut member but also to the back part separated from the nut member with respect to the spline coupling portion between the cylindrical body of the support member and the last stage carrier. It is possible to properly lubricate the spline connecting portion between the cylindrical body of this and the cylindrical portion of the carrier of the final stage.

  According to the invention of claim 3, for example, when four oil passages are provided at an angle interval of 90 degrees with each other on the mounting flange contact surface side of the nut member, the liquid level height of the lubricating oil is the axis of the drum. Even if it is set to the height position, at least one oil passage can be arranged above the position of the axis of the drum regardless of the tightening amount of the nut member. Therefore, by providing four or more oil passages in the nut member, the lubricating oil can be supplied to the spline connecting portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage through at least one oil passage. it can.

  According to the fourth aspect of the present invention, the oil droplets adhering to the mounting flange of the support member flow to the nut contact surface along the tapered inclined surface of the recessed portion provided in the mounting flange. The lubricating oil can be guided toward the oil passage provided on the mounting flange contact surface side. As a result, oil droplets adhering to the mounting flange are efficiently collected by the recessed portion, and a large amount of lubricating oil is supplied to the spline connecting portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage through the oil passage of the nut member. can do.

  According to the fifth aspect of the invention, a large amount of the lubricating oil scraped up by the oil reservoir space side male spline portion of the rotating shaft is attached to the oil guide plate, so that a large amount of oil is provided in the vicinity of the oil passage provided in the nut member. Lubricating oil can be collected. As a result, a large amount of lubricating oil can be supplied to the spline connecting portion between the cylindrical body of the support member and the cylindrical portion of the carrier of the final stage through the oil passage of the nut member, and the spline connecting portion can be efficiently lubricated. it can.

It is a front view which shows the hydraulic shovel as a tracked vehicle provided with the traveling apparatus which concerns on this invention. It is sectional drawing which looked at the traveling apparatus from the arrow II-II direction in FIG. FIG. 3 is a partial enlarged cross-sectional view showing a portion III in FIG. 2 in an enlarged manner. FIG. 4 is a cross-sectional view of a support member, a rotation shaft, a final stage carrier, a nut member, a rotation stop member, and the like as seen from the direction of arrows IV-IV in FIG. It is a disassembled perspective view which shows a support member, a rotating shaft, the carrier of the last stage, a nut member, a rotation stop member, etc. FIG. 4 is an enlarged view of a main part showing a state in which lubricating oil is supplied to a spline joint between the support member and the last stage carrier in FIG. 3. It is a principal part enlarged view similar to FIG. 6 which shows the modification of this invention.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a traveling device for a tracked vehicle according to the present invention is applied to a traveling device for a hydraulic excavator as an example, and will be described in detail with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a tracked vehicle. The vehicle body of the hydraulic excavator 1 is configured by a track-type (crawler type) lower traveling body 2 that can be self-propelled and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A working device 4 is provided on the front side of the upper swing body 3 so as to be able to move up and down, and the working device 4 performs excavation work of earth and sand.

  Here, the lower traveling body 2 includes a track frame 5 as a base, and the track frame 5 includes left and right side frames 5A (only the left side is illustrated) extending in the front and rear directions. A traveling device 11 to be described later is provided on one end side in the longitudinal direction of each side frame 5A, and idler wheels (idlers) 6 are provided on the other end side in the longitudinal direction of each side frame 5A. An endless crawler belt (crawler) 7 is wound around a sprocket 33 and an idler wheel 6 described later of the traveling device 11.

  Next, the traveling device used in the present embodiment will be described.

  11 denotes a traveling device provided on one end side in the longitudinal direction of each side frame 5A constituting the track frame 5, and the traveling device 11 includes, as shown in FIG. The drum 29, the rotating shaft 39, the planetary gear speed reduction mechanisms 40 and 44, the nut member 48, the lubricating oil 52, and the like are included. The traveling device 11 decelerates the rotation of the rotation source 16 by the planetary gear reduction mechanisms 40 and 44 and rotates the drum 29 with a large torque, so that the sprocket 33 and the idler wheel 6 attached to the drum 29 are rotated. The wound crawler belt 7 is driven to go around.

  Reference numeral 12 denotes a support member fixed to each of the left and right side frames 5A of the track frame 5. The support member 12 supports the drum 29 in a rotatable manner. Here, the support member 12 is disposed on the cylindrical body 13 extending in the axial direction along the axis OO serving as the rotation center of the drum 29, and on the axial direction one side (rotation source 16 side) of the cylindrical body 13. It is integrally formed with a disk-shaped mounting flange 14.

  Here, a female spline portion (hole spline portion) 13A is formed on the inner peripheral side on one axial side of the cylindrical body 13, and the female spline portion 13A is connected to a male spline portion 47E of a carrier 47 described later by spline coupling. It is what is done. Further, a bearing engagement step portion 13B having a larger diameter than the cylindrical body 13 is provided on the entire outer periphery of the cylindrical body 13 on one axial direction side, and an inner ring of a later-described bearing 37 is provided on the bearing engagement step portion 13B. Is configured to engage.

  On the other hand, the mounting flange 14 is formed in a disk shape whose diameter increases from the outer peripheral surface of the cylindrical body 13. The outer peripheral edge of the mounting flange 14 is a stepped disk-shaped frame mounting surface 14A, and a plurality of bolt holes (internal threaded holes) 14B are screwed into the frame mounting surface 14A. Then, with the frame mounting surface 14A of the mounting flange 14 in contact with the side frame 5A, the bolts 15 inserted through the side frame 5A are screwed into the bolt holes 14B, so that the support member 12 is attached to the side frame 5A. It is done.

  Further, an end surface 14C located on the opposite side of the mounting flange 14 from the cylindrical body 13 is provided with a recessed portion 14D that is annularly recessed toward the female spline portion 13A of the cylindrical body 13. The recessed portion 14D includes an inclined surface 14D1 that is tapered from an oil sump space 21 that will be described later, and an annular flat surface that is orthogonal to the axis OO of the drum 29 at the back of the inclined surface 14D1. It is formed by a nut contact surface 14D2 that is formed and a nut member 48 described later contacts.

  On the other hand, an annular protrusion 14E concentric with the cylindrical body 13 is provided on the outer peripheral side of the end face 14C with respect to the recessed portion 14D so as to protrude in the axial direction, and a deceleration described later is provided on the outer peripheral surface of the annular protrusion 14E. The inner peripheral surface of the machine casing 17 is fitted. Further, a plurality of bottomed bolt holes 14F are screwed on the outer side of the end face 14C in the radial direction from the annular protrusion 14E. Furthermore, in the vicinity of the recessed portion 14D in the end face 14C, two locking bolt holes 14G for attaching a locking member 51 described later are screwed (see FIG. 5).

  Reference numeral 16 denotes a rotation source provided on one side in the axial direction of the support member 12, and this rotation source generates torque for rotationally driving the drum 29. Here, the rotation source 16 includes a speed reducer casing 17, a speed reduction mechanism 23, and a travel motor 28 which will be described later.

  Reference numeral 17 denotes a reduction gear casing attached to one side of the support member 12 in the axial direction. The reduction gear casing 17 is attached to the inner casing 18 attached to the attachment flange 14 of the support member 12 and the inner casing 18. And an outer casing 19. Here, the inner casing 18 includes a peripheral wall portion 18A extending along the axis OO of the drum 29 and an inner wall portion 18B integrally formed on one side in the axial direction of the peripheral wall portion 18A.

  The other side in the axial direction of the peripheral wall portion 18 </ b> A is fitted to an annular protrusion 14 </ b> E provided on the mounting flange 14 of the support member 12. On the other hand, a bearing mounting hole 18C is formed in the inner wall portion 18B at a position corresponding to the axis OO of the drum 29, and a bearing mounting hole 18C is formed on the outer end surface 18D facing the outer casing 19 of the inner wall portion 18B. A bearing mounting recess 18E is formed on the upper side. Further, an oil sump space 21 described later is formed between the inner end surface 18F facing the mounting flange 14 in the inner wall portion 18B and the end surface 14C of the mounting flange 14 of the support member 12.

  On the other hand, the outer casing 19 is configured by a cylindrical peripheral wall portion 19A attached to the inner casing 18, and an outer wall portion 19B integrally formed so as to cover the peripheral wall portion 19A on one side in the axial direction. Yes. A flange portion 19C is provided on the peripheral edge portion on the other side in the axial direction of the peripheral wall portion 19A, and a plurality of bolts 20 are inserted through the flange portion 19C and the peripheral wall portion 18A of the inner casing 18. Then, the inner casing 18 and the outer casing 19 are integrally attached to the mounting flange 14 by screwing each bolt 20 into a bottomed bolt hole 14 </ b> F screwed to the mounting flange 14 of the support member 12. .

  Further, a bearing mounting recess 19D is formed in the outer wall portion 19B at a position corresponding to the bearing mounting hole 18C of the inner casing 18, and a bearing mounting hole 19E is formed at a position corresponding to the bearing mounting recess 18E of the inner casing 18. It is installed. Further, a motor mounting surface 19F for mounting a travel motor 28 described later is formed at a position corresponding to the bearing mounting hole 19E on the outer surface of the outer wall portion 19B.

  Reference numeral 21 denotes an oil sump space formed between the mounting flange 14 of the support member 12 and the speed reducer casing 17 of the rotation source 16. The oil sump space 21 stores lubricating oil 52 described later. The oil sump space 21 is formed between the mounting flange 14 and the inner casing 18 by fastening the inner casing 18 and the outer casing 19 of the speed reducer casing 17 together with the mounting flange 14 of the support member 12 using bolts 20. Is formed. In addition, a speed reduction mechanism accommodation space 22 is formed between the inner casing 18 and the outer casing 19.

  Reference numeral 23 denotes a speed reduction mechanism accommodated in the speed reduction mechanism accommodation space 22 of the speed reducer casing 17. The speed reduction mechanism 23 includes a small-diameter drive gear 25 rotatably supported by two bearings 24 attached to the bearing attachment recess 18E of the inner casing 18 and the bearing attachment hole 19E of the outer casing 19, and the inner casing 18. The bearing mounting hole 18C of the outer casing 19 and the bearing mounting recess 19D of the outer casing 19 are rotatably supported by two bearings 26, and are constituted by a large-diameter driven gear 27 that always meshes with the drive gear 25. .

  Here, a female spline portion 25A is formed on the inner peripheral side of the boss portion of the drive gear 25, and a motor shaft 28A of a travel motor 28 described later is spline-coupled to the female spline portion 25A. On the other hand, a female spline portion 27A is formed on the inner peripheral side of the boss portion of the driven gear 27, and a rotation source side male spline portion 39A1 of a rotating shaft 39 described later is spline-coupled to the female spline portion 27A.

  Reference numeral 28 denotes a travel motor attached to the speed reducer casing 17, and the travel motor 28 is constituted by a variable displacement hydraulic motor, for example. The travel motor 28 is bolted to the motor mounting surface 19F of the outer casing 19, and the motor shaft 28A of the travel motor 28 is eccentric upward with respect to the axis OO of the drum 29. It protrudes into the speed reduction mechanism accommodation space 22 through the mounting hole 19E. In this way, the motor shaft 28A of the traveling motor 28 is eccentric upward with respect to the axis OO of the drum 29, whereby the mounting position of the traveling motor 28 is separated upward from the ground, and the hydraulic excavator 1 travels. The configuration is such that rocks or the like can collide with the traveling motor 28.

  On the other hand, a male spline portion is formed on the outer peripheral side of the motor shaft 28A, and the motor shaft 28A is spline-coupled to a female spline portion 25A of the drive gear 25 disposed in the speed reduction mechanism accommodation space 22. Therefore, when the travel motor 28 is operated to rotate the motor shaft 28A, the rotation of the travel motor 28 is decelerated in accordance with the gear ratio of the drive gear 25 and the driven gear 27 to a rotation shaft 39 described later. Communicated.

  Reference numeral 29 denotes a cylindrical drum rotatably supported on the support member 12. The drum 29 is formed in a covered cylindrical shape as a whole, and accommodates planetary gear reduction mechanisms 40 and 44 to be described later. Here, the drum 29 includes a drum main body 30 disposed on the outer peripheral side of the cylindrical body 13 constituting the support member 12, a ring gear 31 attached to the other axial side of the drum main body 30, and a shaft of the ring gear 31. It is roughly constituted by a lid 32 attached to the other side in the direction.

  Here, the drum body 30 is formed in a short stepped cylindrical shape, and a large-diameter flange portion 30 </ b> A is integrally formed on the outer peripheral surface of the drum body 30. A sprocket 33 that meshes with the crawler belt 7 is fixed to the flange portion 30 </ b> A using a plurality of bolts 34. On the other hand, on the inner peripheral surface of the drum main body 30, an annular step portion 30B for positioning the bearings 37 and 38, which will be described later, in the axial direction protrudes over the entire circumference.

  The ring gear 31 is formed as a cylindrical body that is open on both sides in the axial direction, and is attached to the other axial side of the drum body 30 using a plurality of bolts 35. On the inner peripheral surface of the ring gear 31, an internal gear 31A that meshes with a planetary gear 42 described later and an internal gear 31B that meshes with a planetary gear 46 described below are provided side by side in the axial direction.

  The lid 32 is formed in a substantially disc shape, and is attached to the other side in the axial direction of the ring gear 31 using a plurality of bolts 36, thereby covering the other side in the axial direction of the ring gear 31. A bearing 32 </ b> A is provided on the inner side surface of the lid 32 to support the other side in the axial direction of the rotating shaft 39 described later.

  Reference numerals 37 and 38 denote two bearings provided between the cylindrical body 13 constituting the support member 12 and the drum main body 30. The inner rings of the bearings 37 and 38 are respectively fitted to the outer circumferential surface of the cylindrical body 13 constituting the support member 12, and the outer rings of the bearings 37 and 38 are fitted to the inner circumferential surface of the drum body 30, respectively. Yes. Accordingly, the drum 29 is rotatably supported by the cylindrical body 13 of the support member 12 via the bearings 37 and 38.

  In this case, the bearing 37 is positioned in the axial direction by engaging the inner ring with the bearing engaging step portion 13 </ b> B of the cylindrical body 13 and engaging the outer ring with the annular step portion 30 </ b> B of the drum body 30. On the other hand, the bearing 38 is positioned in the axial direction when the inner ring engages with a gear support 47C of the carrier 47 described later and the outer ring engages with the annular step 30B of the drum body 30.

  Reference numeral 39 denotes a rotation shaft that is inserted between the rotation source 16 and the drum 29 in the cylindrical body 13 of the support member 12 in the axial direction. The rotation shaft 39 is disposed concentrically with the axis OO of the drum 29. Has been. One side of the rotating shaft 39 in the axial direction is splined to the female spline portion 27A of the driven gear 27 constituting the rotation source 16, and the other side of the rotating shaft 39 in the axial direction is a bearing provided on the lid body 32 of the drum 29. 32A is supported.

  Here, a long male spline portion 39A is formed on one side in the axial direction of the rotary shaft 39, and the male spline portion 39A is spline-coupled to the female spline portion 27A of the driven gear 27. 39A1 and an oil sump space side male spline portion 39A2 extending into the oil sump space 21 from the rotation source side male spline portion 39A1. In this case, the oil sump space side male spline portion 39A2 extends from the inner end face 18F of the inner casing 18 into the oil sump space 21 with an axial length dimension L. The oil sump space-side male spline portion 39A2 scrapes up the later-described lubricating oil 52 stored in the oil sump space 21 as the rotating shaft 39 rotates.

  Further, a male spline portion 39B shorter than the male spline portion 39A is formed on the other side in the axial direction of the rotating shaft 39, and this male spline portion 39B is splined to the inner peripheral side of the sun gear 41 described later. Yes. The rotation shaft 39 transmits the rotation reduced by the reduction mechanism 23 to the planetary gear reduction mechanism 40.

  Reference numeral 40 denotes a first-stage planetary gear speed reduction mechanism provided in the drum 29. The planetary gear speed reduction mechanism 40 meshes with a sun gear 41 in which the male spline portion 39B of the rotating shaft 39 is spline-coupled, and the sun gear 41 and the internal gear 31A of the ring gear 31, and rotates around the sun gear 41. A plurality of planetary gears 42 (only one is shown) that revolves while revolving, and a carrier 43 that rotatably supports the planetary gears 42 via pins 43A and the like. The planetary gear reduction mechanism 40 decelerates the rotation of the sun gear 41 and transmits the revolution of the planetary gear 42 to the second-stage sun gear 45 to be described later via the carrier 43.

  Reference numeral 44 denotes a second-stage planetary gear reduction mechanism provided in the drum 29. The planetary gear speed reduction mechanism 44 includes a sun gear 45 splined to the first stage carrier 43 with the rotary shaft 39 inserted on the inner peripheral side, and the sun gear 45 and the internal gear 31B of the ring gear 31. A plurality of planetary gears 46 (only one is shown) that mesh with each other and a final stage carrier 47 that rotatably supports the planetary gears 46 via pins 47A and the like.

  Here, the carrier 47 at the final stage extends in the axial direction along the axis OO of the drum 29, and has a small-diameter cylindrical portion 47B fitted into the cylindrical body 13 of the support member 12, and the cylindrical portion 47B. It is formed by a gear support portion 47C provided on the other side in the axial direction and rotatably supporting the planetary gear 46 via a pin 47A. The cylindrical portion 47B includes a fitting cylinder portion 47D that is located on the other side in the axial direction and is fitted to the inner peripheral surface of the cylindrical body 13, and a female spline portion of the cylindrical body 13 of the support member 12 that is located on one side in the axial direction. The male spline part 47E spline-coupled to 13A and the male screw part 47F which is located further on the one axial side than the male spline part 47E and faces the oil sump space 21 are provided.

  When the cylindrical portion 47 </ b> B is inserted into the cylindrical body 13 of the support member 12, the fitting cylinder portion 47 </ b> D is fitted to the inner peripheral surface of the cylindrical body 13, so that the carrier 47 is aligned with the axis OO of the drum 29. Positioned above, the male spline portion 47E is splined to a female spline portion 13A provided on the cylindrical body 13 of the support member 12. Accordingly, the last stage carrier 47 is fixed in the rotational direction with respect to the support member 12, and the rotation of the planetary gear 46 supported by the carrier 47 is transmitted to the drum 29 via the internal gear 31 </ b> B of the ring gear 31. The

  When the cylindrical portion 47B is inserted into the cylindrical body 13 of the support member 12, the male screw portion 47F is connected to the oil reservoir space 21 from the nut contact surface 14D2 of the recessed portion 14D provided on the mounting flange 14 of the support member 12. The nut member 48 described later is screwed into the male screw portion 47F.

  Further, a vent hole 47G that penetrates in a radial direction from the outer peripheral surface of the cylindrical portion 47B to the inner peripheral surface is formed between the fitting cylindrical portion 47D and the male spline portion 47E in the cylindrical portion 47B. A space formed between the cylindrical body 13 of the support member 12 and the cylindrical portion 47B of the carrier 47 communicates with the inner peripheral side of the carrier 47 through the vent hole 47G.

  Next, reference numeral 48 denotes a nut member that is screwed into the male screw portion 47F of the final stage carrier 47. The nut member 48 is fastened to the male screw portion 47F of the carrier 47, whereby the gears of the support member 12 and the carrier 47 are shown. The bearings 37 and 38 are positioned in the axial direction between the support portion 47C. Here, the nut member 48 is formed in a cylindrical shape as a whole as shown in FIGS. 4 to 6, and a female screw portion 48 </ b> A that is screwed into the male screw portion 47 </ b> F of the carrier 47 is screwed on the inner peripheral side thereof. . The end surface of the nut member 48 on the other side in the axial direction is a flat mounting flange contact surface 48B. The mounting flange contact surface 48B is tightened into the male threaded portion 47F of the carrier 47, thereby supporting the support member 12. It contacts with the nut contact surface 14D2 of the recessed portion 14D provided on the mounting flange 14 of.

  Reference numeral 48C denotes a plurality of (for example, eight) arcuate protrusions projecting from the outer peripheral surface of the nut member 48. These arcuate protrusions 48C are arranged at regular intervals in the circumferential direction. Thus, a plurality of engagement grooves 48D having a constant groove width are formed between the arcuate protrusions 48C, and a tool (not shown) for tightening the nut member 48 into each engagement groove 48D is formed. Can be engaged. Further, by engaging a locking member 51 (described later) with one of the engagement grooves 48D, the nut member 48 fastened to the male thread portion 47F of the carrier 47 can be locked. Yes.

  Reference numeral 49 denotes a plurality (for example, six) of oil passages provided on the mounting flange contact surface 48B of the nut member 48. Each of these oil passages 49 is formed by a groove (oil groove) having a circular arc section extending radially between the outer peripheral edge and the inner peripheral edge of the mounting flange contact surface 48B, and is constant in the circumferential direction of the mounting flange contact surface 48B. Are arranged at intervals of.

  Accordingly, as shown in FIG. 6, when the nut member 48 is tightened into the male threaded portion 47 </ b> F of the carrier 47, the mounting flange abutting surface 48 </ b> B of the nut member 48 is recessed in the mounting flange 14 of the support member 12. A space through which the lubricating oil 52 flows is formed between the nut contact surface 14D2 and each oil passage 49 when contacting the nut contact surface 14D2 of the portion 14D.

  As a result, the lubricating oil 52 scraped up by the oil sump space side male spline portion 39A2 of the rotary shaft 39 adheres to the end surface 14C of the mounting flange 14 to become oil droplets 52A, and the inclined surface of the recessed portion 14D from the end surface 14C. When flowing down to the outer peripheral surface of the nut member 48 along 14D1, the oil droplet 52A passes through the oil passage 49 of the nut member 48 and the female spline portion 13A of the support member 12 (cylindrical body 13) and the final carrier 47 (cylindrical). To the spline coupling portion with the male spline portion 47E of the portion 47B). Accordingly, the lubricating oil 52 is also supplied to a portion of the spline coupling portion between the female spline portion 13A of the support member 12 and the male spline portion 47E of the carrier 47 that is located above the axis OO of the drum 29. It is the structure which can do.

  In this case, the cylindrical portion 47B constituting the final stage carrier 47 is provided with a vent hole 47G penetrating in a radial direction from the outer peripheral side to the inner peripheral side of the cylindrical portion 47B. Therefore, the air in the space formed between the cylindrical body 13 of the support member 12 and the cylindrical portion 47B of the carrier 47 can be discharged to the inner peripheral side of the carrier 47 through the vent hole 47G. Lubricating oil 52 can be reliably supplied to the spline connecting portion between the cylindrical body 13 of the member 12 and the cylindrical portion 47B of the carrier 47.

  Reference numeral 51 denotes a rotation stop member attached to the attachment flange 14 of the support member 12, and the rotation stop member 51 stops rotation of the nut member 48 fastened to the male thread portion 47 </ b> F of the carrier 47. The locking member 51 is formed in a substantially T-shape, and includes a mounting plate portion 51A that is attached to the end face 14C of the mounting flange 14, and a protrusion 51B that protrudes from the central portion in the length direction of the mounting plate portion 51A. ing.

  Then, the nut member 48 is fastened to the male thread portion 47F of the carrier 47, and the locking member 51 of the locking member 51 is brought into contact with the nut contact surface 48D2 of the mounting flange 14 with the mounting flange contact surface 48B of the nut member 48 being in contact. The protrusion 51 </ b> B is engaged with the engagement groove 48 </ b> D of the nut member 48. Then, the bolt 51C inserted through the mounting plate portion 51A of the locking member 51 is screwed into the locking bolt hole 14G provided in the end surface 14C of the mounting flange 14, whereby the nut member 48 is externally threaded portion 47F of the carrier 47. It is possible to stop the rotation in the state where it is tightened.

  Reference numeral 52 denotes lubricating oil stored in the reducer casing 17 and the drum 29, and the height position of the liquid surface of the lubricating oil 52 is normally set at the position of the axis OO of the drum 29. When the drum 29 rotates, the speed reduction mechanism 23 disposed in the speed reducer casing 17, the planetary gear speed reduction mechanisms 40 and 44 disposed in the drum 29, the bearings 37 and 38, etc. are lubricated by the lubricating oil 52. be able to.

  The traveling device 11 according to the present embodiment has the above-described configuration. When the traveling motor 28 operates and the motor shaft 28A rotates, the rotation of the motor shaft 28A is driven from the drive gear 25 of the speed reduction mechanism 23 to the driven gear. The rotary shaft 39 decelerated while being transmitted to the sprocket 27 and spline-coupled to the driven gear 27 outputs the decelerated rotation to the sun gear 41 of the first stage planetary gear reduction mechanism 40.

  When the first-stage sun gear 41 rotates, the planetary gear 42 revolves while rotating around the sun gear 41, and the revolution of the planetary gear 42 is transmitted to the carrier 43. The reduced rotation of the carrier 43 is transmitted to the sun gear 45 of the second stage planetary gear reduction mechanism 44, and the planetary gear 46 meshing with the sun gear 45 rotates while meshing with the internal gear 31B of the ring gear 31. . Here, since the last stage carrier 47 that supports the planetary gear 46 is splined to the support member 12, the rotation of the planetary gear 46 is transmitted to the drum 29 via the internal gear 31 </ b> B of the ring gear 31.

  As described above, the rotation of the traveling motor 28 is transmitted to the drum 29 after being decelerated by three stages by the speed reduction mechanism 23 and the planetary gear speed reduction mechanisms 40 and 44. As a result, the drum 29 rotates with a large torque, and the crawler belt 7 wound around the sprocket 33 and the idler wheel 6 attached to the drum 29 is driven to rotate, so that the excavator 1 can run.

  In this case, the reducer casing 17 and the drum 29 are filled with the lubricating oil 52 up to the height position of the axis 29 of the drum 29. Thereby, when the traveling device 11 is operated, the speed reduction mechanism 23, the planetary gear speed reduction mechanisms 40 and 44, the bearings 37 and 38, and the like can be properly lubricated by the lubricating oil 52.

  Here, when attention is paid to the spline coupling portion between the female spline portion 13A provided on the cylindrical body 13 of the support member 12 and the male spline portion 47E provided on the cylindrical portion 47B of the carrier 47 at the final stage, the support member 12 is supported. Of the spline connecting portion between the carrier 47 and the carrier 47, the lower part (lower half) of the drum 29 than the axis OO is immersed in the lubricating oil 52. On the other hand, it is necessary to supply the lubricating oil 52 to the part above the axis OO of the drum 29 (upper half) in the spline connecting portion between the support member 12 and the carrier 47.

  Therefore, in the present embodiment, the male spline portion 39A provided on one side in the axial direction of the rotation shaft 39 is replaced with the rotation source side male spline portion 39A1 splined to the driven gear 27 of the speed reduction mechanism 23, and the rotation source side. An oil sump space side male spline part 39A2 extending from the male spline part 39A1 into the oil sump space 21 is formed.

  For this reason, as shown in FIG. 6, the lubricating oil 52 stored in the oil sump space 21 can be scraped up by the oil sump space side male spline portion 39A2 of the rotating shaft 39, and the picked-up lubricating oil A large number of oil droplets 52 </ b> A consisting of 52 can be attached to the end face 14 </ b> C of the mounting flange 14 constituting the support member 12, and can flow down along the end face 14 </ b> C as indicated by an arrow A.

  In the present embodiment, a plurality of oil passages 49 are provided on the mounting flange contact surface 48B of the nut member 48 that is screwed into the male thread portion 47F of the carrier 47. Accordingly, when the mounting flange contact surface 48B of the nut member 48 is contacted with the nut contact surface 14D2 of the recessed portion 14D of the mounting flange 14, the space between the nut contact surface 14D2 and each oil passage 49 is reached. A space through which the lubricating oil 52 flows can be formed.

  In this case, in the present embodiment, six groove-like oil passages 49 are provided on the mounting flange contact surface 48B of the nut member 48 at a constant interval (60 degrees in the circumferential direction). Therefore, regardless of the tightening amount when the mounting flange contact surface 48B of the nut member 48 contacts the nut contact surface 14D2 of the mounting flange 14 (concave portion 14D), at least two oil passages 49 are provided. The drum 29 can be disposed above the axis OO.

  Thereby, the oil droplet 52A attached to the end surface 14C of the mounting flange 14 flows down from the end surface 14C to the outer peripheral surface of the nut member 48 along the inclined surface 14D1 of the recessed portion 14D, and then through the oil passage 49 of the nut member 48. The spline connecting portion between the female spline portion 13A of the support member 12 (cylindrical body 13) and the male spline portion 47E of the final stage carrier 47 (cylindrical portion 47B) is supplied. For this reason, the lubricating oil 52 can be sufficiently supplied also to a portion of the spline coupling portion between the support member 12 and the carrier 47 that is located above the axis OO of the drum 29. As a result, the spline coupling portion between the support member 12 and the final stage carrier 47 can be properly lubricated over the entire circumference, and the life of the support member 12 and the carrier 47 can be extended. 11 reliability can be improved.

  Moreover, the cylindrical portion 47B of the carrier 47 is provided with a vent hole 47G that is located between the fitting cylindrical portion 47D and the male spline portion 47E and penetrates in the radial direction from the outer peripheral side to the inner peripheral side of the cylindrical portion 47B. It is configured. Thereby, the space formed between the cylindrical body 13 of the support member 12 and the cylindrical portion 47B of the carrier 47 can be communicated with the inner peripheral side of the carrier 47 through the vent hole 47G.

  Therefore, even in a state where the space between the cylindrical body 13 of the support member 12 and the cylindrical portion 47B of the carrier 47 is closed by the fitting portion between the cylindrical body 13 and the fitting cylindrical portion 47D, the arrow in FIG. As indicated by B, the air on the outer peripheral side of the cylindrical portion 47B can be extracted to the inner peripheral side of the cylindrical portion 47B through the vent hole 47G. As a result, with respect to the spline coupling portion between the cylindrical body 13 of the support member 12 and the cylindrical portion 47 </ b> B of the carrier 47 of the final stage, the lubricating oil extends not only to the vicinity of the nut member 48 but also to the back portion separated from the nut member 48. 52 can be supplied, and the spline coupling portion between the cylindrical body 13 of the support member 12 and the cylindrical portion 47B of the carrier 47 at the final stage can be properly lubricated.

  Next, FIG. 7 shows a second embodiment of the present invention. A feature of the present embodiment is that an oil guide plate is provided above the nut member, and the lubricating oil scraped up by the oil reservoir space side male spline portion of the rotating shaft is guided to the oil passage of the nut member by the oil guide plate. It is in the configuration. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 61 denotes an oil guide plate attached to the end face 14C of the mounting flange 14 constituting the support member 12. The oil guide plate 61 is located above the nut member 48 in the oil sump space 21 of the speed reducer casing 17. Is arranged. The oil guide plate 61 guides the lubricating oil 52 scraped up by the oil sump space side male spline portion 39A2 of the rotating shaft 39 to the oil passage 49 of the nut member 48.

  Here, the oil guide plate 61 is formed by bending a thin plate such as a steel plate into a substantially V shape, and extends vertically along the end surface 14C of the mounting flange 14, and the lower end of the vertical surface portion 61A. An inclined surface portion 61B extending obliquely upward from the side toward the inner end surface 18F of the inner casing 18 is formed. Then, by attaching the vertical surface portion 61A of the oil guide plate 61 to the end surface 14C of the mounting flange 14 above the nut member 48 using the bolts 62, the inclined surface portion 61B of the oil guide plate 61 becomes the end surface 14C of the mounting flange 14. It is the structure which protrudes in the oil sump space 21 diagonally upward.

  The traveling device according to the present embodiment is provided with the oil guide plate 61 as described above, and most of the lubricating oil 52 scraped up by the oil sump space side male spline portion 39A2 of the rotating shaft 39 is formed on the oil guide plate 61. It comes to adhere to the inclined surface part 61B. Thereby, as shown by the arrow C in FIG. 7, many oil droplets 52A adhering to the inclined surface portion 61B quickly reach the outer peripheral surface of the nut member 48 along the inclined surface 14D1 of the recessed portion 14D. Can flow down.

  As a result, a large amount of lubricating oil 52 can be collected in the vicinity of the oil passage 49 provided in the nut member 48, and a large amount of lubricating oil 52 is splined between the support member 12 and the carrier 47 through the oil passage 49 of the nut member 48. Since it can supply to a joint part, the spline joint part of the cylindrical body 13 of the support member 12 and the cylindrical part 47B of the carrier 47 can be lubricated efficiently.

  In the embodiment described above, the speed reducer casing 17, the speed reduction mechanism 23, and the travel motor 28 constitute the rotation source 16, and after the speed of the travel motor 28 is reduced by the speed reduction mechanism 23, the rotation shaft 39 is moved. The structure which transmits to the planetary gear reduction mechanism 40 of the 1st step via is illustrated. However, the present invention is not limited to this. For example, the speed reduction mechanism 23 is omitted, and the rotation of the travel motor 28 is transmitted to the first stage planetary gear speed reduction mechanism 40 via the rotation shaft 39 without speed reduction. Also good. In this case, a joint connected to the motor shaft 28A of the traveling motor 28 can be provided, and the rotation source side male spline portion 29A of the rotary shaft 39 can be spline-coupled to the joint.

  Further, in the above-described embodiment, the case where the oil passage 49 including a groove (oil groove) having an arcuate cross section is provided on the mounting flange contact surface 48B of the nut member 48 is illustrated. However, the present invention is not limited to this. For example, an oil passage including a hole (oil hole) having a circular cross section may be provided in the vicinity of the mounting flange contact surface 48B.

  In the above-described embodiment, the case where the cylindrical portion 47B of the carrier 47 at the final stage is provided with the vent hole 47G that communicates the outer peripheral side and the inner peripheral side of the cylindrical portion 47B is illustrated. However, the present invention is not limited to this, and a configuration in which the vent hole 47G is not provided in the cylindrical portion 47B of the carrier 47 may be adopted. Even in this case, by removing air through a slight gap formed between the fitting cylindrical portion 47D of the carrier 47 and the fitting portion of the cylindrical member 13 of the supporting member 12, the cylindrical member 13 of the supporting member 12 and Lubricating oil 52 can be supplied to a spline coupling portion with the cylindrical portion 47 </ b> A of the carrier 47 even to a back portion separated from the nut member 48.

  Further, in the above-described embodiment, the case where the six oil passages 49 are provided on the mounting flange contact surface 48B of the nut member 48 with a constant interval is illustrated. However, the present invention is not limited to this, and in a state where the mounting flange contact surface 48B of the nut member 48 is in contact with the nut contact surface 14D2 of the mounting flange 14, at least one oil passage 49 is connected to the drum 29. What is necessary is just the structure arrange | positioned above this axis OO. Therefore, it is preferable to provide four or more oil passages 49 with a fixed interval with respect to the mounting flange contact surface 48B of the nut member 48.

  Furthermore, although the crawler type hydraulic excavator has been exemplified as the tracked vehicle in the above-described embodiment, the present invention is not limited to this, and is widely applied to other tracked vehicles such as a crawler type hydraulic crane. be able to.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 5 Track frame 11 Traveling apparatus 12 Support member 13 Cylindrical body 13A Female spline part 14 Mounting flange 14D Recessed part 14D1 Inclined surface 14D2 Nut contact surface 16 Rotation source 21 Oil reservoir space 29 Drum 32 Lid body 33 Sprocket 37, 38 Bearing 39 Rotating shaft 39A1 Rotation source side male spline part 39A2 Oil sump space side male spline part 40, 44 Planetary gear speed reduction mechanism 47 Final stage carrier 47B Cylindrical part 47C Gear support part 47E Male spline part 47F Male thread part 47G Vent hole 48 Nut member 48B Mounting flange contact surface 49 Oil passage 52 Lubricating oil 61 Oil guide plate

Claims (5)

A support member which has a cylindrical body extending in the axial direction and a mounting flange provided on one side in the axial direction of the cylindrical body and is fixed to the track frame of the tracked vehicle;
A rotation source attached to a mounting flange of the support member;
An oil sump space formed between the rotation source and the mounting flange of the support member;
One side in the axial direction is rotatably supported on the outer peripheral side of the cylindrical body of the support member via a bearing and the other side in the axial direction is covered with a lid, and the outer side meshes with a crawler belt for traveling. A drum with a sprocket attached thereto,
A rotation shaft that is inserted between the rotation source and the drum in the axial direction of the support member, one side in the axial direction is splined to the rotation source, and the other side in the axial direction is supported by the lid of the drum;
A one-stage or multiple-stage planetary gear reduction mechanism that is provided in the drum and decelerates rotation of the rotation shaft and transmits the rotation to the drum;
The oil sump space and the lubricating oil stored in the drum,
On the inner peripheral side of the cylindrical body of the support member, a female spline portion is provided on one side in the axial direction,
The final stage carrier of the planetary gear speed reduction mechanism includes a small-diameter cylindrical portion fitted in the cylindrical body of the support member, and a gear support that is provided on the other axial side of the cylindrical portion and rotatably supports the planetary gear. Formed by the part,
On the outer peripheral side of the cylindrical portion of the carrier of the final stage, there is a male spline portion located on one side in the axial direction and splined to the female spline portion of the support member, and further in the axial direction than the male spline portion. A male screw portion provided on the outer peripheral side of the cylindrical portion located on the side and facing the oil sump space;
A nut member for axially positioning the bearing between the support member and the gear support portion of the final stage carrier is screwed to the male screw portion of the final stage carrier,
In a traveling apparatus for a tracked vehicle, a rotation stopping member is provided between the nut member and a mounting flange of the support member to stop the nut member screwed into the male screw portion of the last stage carrier. ,
A male spline portion provided on one axial side of the rotation shaft extends into the oil sump space from a rotation source side male spline portion that is splined to the rotation source, and the rotation source side male spline portion. It is constituted by an oil sump space side male spline portion that scrapes up the lubricating oil stored in the oil sump space,
The lubricating oil scraped up by the oil reservoir space-side male spline portion on the mounting flange contact surface side of the nut member that contacts the mounting flange of the support member is a female spline portion of the cylindrical body of the support member. A tracked vehicle travel device characterized in that an oil passage is provided to supply a spline coupling portion between the first stage carrier and the female spline portion of the cylindrical portion of the carrier of the last stage.   The cylindrical portion of the carrier at the final stage is provided with a vent hole that is located near the other axial side of the male spline portion and communicates the inner peripheral side and the outer peripheral side of the cylindrical portion. A traveling device for a tracked vehicle according to 1.   3. The tracked vehicle travel device according to claim 1, wherein four or more oil passages are provided at a constant angle in a circumferential direction of a mounting flange contact surface of the nut member. 4.   The mounting flange of the support member is provided with a recessed portion that is recessed toward the female spline portion of the cylindrical body, and the recessed portion includes an inclined surface that is tapered from the oil reservoir space, and the inclined surface. 4. The traveling device for a tracked vehicle according to claim 1, wherein the running device is configured by a nut abutting surface that is located in a deep part of the nut member and abuts against a mounting flange abutting surface of the nut member.   On the mounting flange of the support member, the lubricating oil scraped up by the oil sump space side male spline portion of the rotating shaft is positioned above the nut member and located in the oil sump space. The traveling device for a tracked vehicle according to claim 1, 2, 3, or 4, wherein an oil guide plate is provided to guide the oil passage.

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