JPWO2019044233A1 - Reduction gear - Google Patents

Abstract

Provided is a speed reduction device capable of stably supplying lubricating oil to a spline connection portion between a rotation source and a rotation shaft even when a rotation side housing rotates at high speed for a long time. The reduction gear transmission 14 includes a plurality of stages of planetary gear mechanisms 23, 31, and 37 that reduce the rotation of the hydraulic motor 12 and transmit the reduced rotation to the rotating housing 17. The rotation side housing 17 is filled with lubricating oil 43 while being connected at the spline connection part S. The third carrier 40 of the final stage planetary gear mechanism 37 is fixedly supported by the fixed side housing 15, and is supplied by the through hole 45 formed in the third carrier 40 and the space 46 existing above the spline coupling portion S. By forming the path 44, even when the vehicle is running at high speed for a long time, the lubricating oil 43 squirting from the meshing portion between the third sun gear 38 and the third planetary gear 39 passes through the through hole 45 and the space 46, and the spline joint is formed. S was supplied.

Description

  The present invention relates to a reduction gear suitable for use in, for example, a hydraulic shovel, a traveling device of a hydraulic crane, and the like.

  In general, tracked vehicles such as hydraulic shovels have a traveling body that can travel on its own using a traveling device, an upper revolving body that is mounted on the traveling body so as to be able to turn, and an elevating body that can move up and down to the front side of the upper revolving body. It is roughly constituted by the provided working device.

  The traveling device includes a fixed-side housing fixed to one side in the front and rear directions of a side frame fixed to the left and right of the track frame of the traveling body, a rotation source attached to the fixed-side housing, and a fixed-side housing. A rotatable housing that is rotatably supported and has a sprocket that meshes with the crawler belt for traveling, a rotatable shaft inserted in the axial direction of the fixed housing between the rotatable source and the rotatable housing, A planetary gear mechanism for reducing the rotation and transmitting the rotation to the rotation side housing.

  As a prior art of the traveling device configured as described above, as described in Patent Document 1, a speed reducer that can obtain a large reduction ratio by providing a plurality of stages, for example, three stages, of a planetary gear mechanism is used. What was known is known.

  Specifically, in the reduction gear device described in Patent Document 1, the first-stage planetary gear mechanism is provided on a rotating shaft having one end spline-coupled to an output shaft of a rotation source, and on the other end of the rotating shaft. A first planetary gear, which is disposed so as to mesh with the first sun gear, the first sun gear, and an internal gear provided on the inner peripheral side of the rotation side housing, and revolves around the first sun gear while rotating around itself. And a first carrier rotatably supporting the first planetary gear. The second-stage planetary gear mechanism is loosely fitted to the rotating shaft, and meshes with the second sun gear to which the revolution of the first carrier is transmitted, and the second sun gear and the internal gear of the rotating housing. A second planetary gear is provided and revolves around the second sun gear while rotating around the second sun gear, and a second carrier rotatably supports the second planetary gear. Further, the third stage (final stage) planetary gear mechanism has a third sun gear loosely fitted on the rotation shaft and to which the revolution of the second carrier is transmitted, and a third sun gear and an internal gear of the rotation side housing. A third planetary gear that is arranged to mesh with the second sun gear and that rotates around the second sun gear; and a third carrier that rotatably supports the third planetary gear, wherein the third carrier is a stationary housing. Is mounted in a non-rotating state.

  In the speed reducer configured as described above, when the motor serving as the rotation source rotates, the rotation is controlled by a first stage planetary gear mechanism including a first sun gear, a first planetary gear, a first carrier, and the like to a predetermined reduction ratio. And only the revolution of the first planetary gear is output from the first carrier to the second sun gear of the second stage planetary gear mechanism. The second-stage planetary gear mechanism including the second sun gear, the second planetary gear, the second carrier, and the like further reduces the rotation from the first carrier at a predetermined reduction ratio, and only rotates the second planetary gear. From the second carrier to the third sun gear of the final stage planetary gear mechanism. Further, in the final stage planetary gear mechanism including the third sun gear, the third planetary gear, the third carrier, and the like, since the third carrier is attached to the fixed housing in a non-rotating state, the rotation from the second carrier is not performed. The output can be transmitted from the third sun gear to the rotating housing via the third planetary gear while reducing the output at a predetermined reduction ratio, and a large rotating torque can be generated in the rotating housing.

JP-A-10-159914

  By the way, in the traveling apparatus according to the prior art, the rotating housing is usually filled with lubricating oil for lubricating the planetary gear mechanism, and the lubricating oil is supplied to a position passing through the center axis of the sun gear of the planetary gear mechanism. Is filled. Here, the oil level of the lubricating oil is small when the vehicle is stopped or running at low speed and for a short time, because the stirring and scattering action of the lubricating oil due to the rotation of the planetary gear mechanism is small. The lower part of the spline connection between the shaft and the rotating shaft will continue to be immersed in the lubricating oil.

  However, when the vehicle is running at high speed for a long period of time, the lubricating oil sticks to the internal gear of the rotating housing due to the action of viscosity or centrifugal force, and the oil level of the lubricating oil drops accordingly. In some cases, the spline joint between the shaft and the rotating shaft is completely exposed from the lubricating oil surface. If this state continues, the lubricating oil supplied to the spline joint between the output shaft and the rotating shaft of the motor becomes insufficient, causing a problem that the life of the spline joint is shortened. If the amount of lubricating oil is increased to such an extent that a necessary and sufficient oil level can be secured even when the oil level is low, it is possible to supply the lubricating oil to the spline joint even when the oil level is low. In this case, since the stirring resistance of the lubricating oil is increased, another problem that the running efficiency is reduced occurs, and further, the problem that the cost of the lubricating oil is increased also occurs.

  The present invention has been made in view of such circumstances of the prior art, and has as its object the purpose of rotating the rotating source and the rotating shaft even if the rotating housing rotates at high speed for a long time without increasing the amount of lubricating oil. It is an object of the present invention to provide a speed reducer capable of stably supplying lubricating oil to a spline joint.

  In order to achieve the above object, a reduction gear transmission according to the present invention includes a fixed housing, a rotation source provided in the fixed housing, a rotating housing rotatably supported by the fixed housing, and one end. A side is spline-coupled to the rotation source, the other end includes a rotation shaft supported by the rotation-side housing, and a multi-stage planetary gear mechanism that reduces the rotation of the rotation shaft and transmits the rotation to the rotation-side housing, In the speed reducer in which the rotating side housing is filled with lubricating oil, a carrier of the last stage planetary gear mechanism is fixedly supported by the fixed side housing, and the last stage planetary gear is mounted on the carrier. A supply path is provided facing the meshing portion between the sun gear and the planetary gear of the mechanism, and meshes with the sun gear and the planetary gear with the rotation of the rotation source. It is characterized in that the lubricant adhering is supplied to the spline coupling portion of the rotary shaft and the rotational source through the supply path.

  ADVANTAGE OF THE INVENTION According to the reduction gear transmission of this invention, even if a rotating side housing rotates at high speed and for a long time, lubricating oil can be stably supplied to the spline connection part of a rotation source and a rotating shaft. Problems, configurations, and effects other than those described above will be apparent from the following description of the embodiments.

1 is a front view showing a hydraulic excavator provided with a speed reducer according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the traveling device disposed on the traveling body as viewed from the direction of arrows II-II in FIG. 1. FIG. 3 is an enlarged view of a main part of the traveling device shown in FIG. 2. It is a sectional view showing an important section of a reduction gear concerning a 1st embodiment of the present invention. FIG. 5 is an explanatory diagram viewed from an arrow A direction in FIG. 4. It is a sectional view of the traveling device provided with the reduction gear concerning a 2nd embodiment of the present invention. It is a sectional view of the traveling device provided with the reduction gear concerning a 3rd embodiment of the present invention. It is a sectional view of a traveling device provided with a reduction gear according to a fourth embodiment of the present invention. It is a sectional view of a traveling device provided with a reduction gear according to a fifth embodiment of the present invention. FIG. 10 is an explanatory view of a final stage carrier provided in the reduction gear transmission of FIG. 9 as viewed from a hydraulic motor side. It is a sectional view of a traveling device provided with a reduction gear according to a sixth embodiment of the present invention.

  Hereinafter, an embodiment of a reduction gear transmission according to the present invention applied to a traveling device of a hydraulic shovel will be described in detail with reference to the accompanying drawings as an example.

  First, the configuration of the excavator will be described. FIG. 1 is a front view of a hydraulic excavator which is a typical example of a construction machine. The hydraulic excavator 1 has a tracked (crawler) traveling body 2 which can move on its own and a turnably mounted on the traveling body 2. The revolving superstructure 3 is roughly constituted by a working device 4 provided on the front side of the upper revolving structure 3 so as to be capable of ascending and descending. The working device 4 is used to perform excavation work and the like. .

  The traveling body 2 includes a track frame 5 serving as a base. The track frame 5 has left and right side frames 5A (only the left side is shown) extending in the front and rear directions. An idler wheel 6 is provided at one end in the longitudinal direction of each side frame 5A, and a traveling device 9 described later is provided at the other end in the longitudinal direction of each side frame 5A. An endless crawler belt (crawler) 8 is wound around a drive wheel (sprocket) 7 and an idle wheel 6 of the traveling device 9.

  FIG. 2 is a cross-sectional view of the traveling device 9 as viewed from the direction of arrows II-II in FIG. 1, and FIG. 3 is an enlarged view of a main part of the traveling device 9 shown in FIG.

  As shown in FIGS. 2 and 3, the traveling device 9 includes a hydraulic motor 12, a reduction gear 14, a fixed housing 15, a rotation housing 17, a rotation shaft 24, and the like. It includes a stage, for example, a three-stage planetary gear mechanism 23, 31, 37 or the like. Then, the traveling device 9 rotates the drive wheel 7 with a large torque by decelerating the rotation of the hydraulic motor 12 by the speed reduction device 14, and causes the crawler belt 8 wound between the drive wheel 7 and the idle wheel 6 to rotate. It is driven to rotate.

  The hydraulic motor 12, which is a rotation source, drives the cylindrical output shaft 13 to rotate by supplying pressure oil from a hydraulic pump (not shown). A hole-side spline portion 13A is provided on the inner peripheral surface of the output shaft 13, and the hole-side spline portion 13A and a shaft-side spline portion 24A of the rotary shaft 24, which will be described later, are spline-coupled (see FIG. 3). .

  The fixed side housing 15 has a cylindrical portion 15A, a bottom portion 15B, and a lid portion 15C, and the hydraulic motor 12 is housed therein. An annular flange portion 15D is integrally formed on the outer peripheral side of the cylindrical portion 15A, and the flange portion 15D is fixed to the side frame 5A using a bolt or the like. A shaft-side spline portion 15E is provided on the outer peripheral side of the cylindrical portion 15A, and the shaft-side spline portion 15E is spline-connected to a hole-side spline portion 40B of the third carrier 40 in the final stage described later. An output shaft 13 is rotatably installed at the center of the bottom 15B, and the output of the hydraulic motor 12 is transmitted from the output shaft 13 to the rotation shaft 24.

  The rotating housing 17 is roughly composed of a drum main body 10 located on the outer peripheral side of the fixed housing 15, the drum 11 provided with the internal gear 11 </ b> A on the inner peripheral side, and a bottom lid 16 for closing the drum 11. ing.

  The drum body 10 is rotatably supported by a cylindrical portion 15A of the fixed housing 15 via a main bearing 50, and the main bearing 50 is axially positioned by a bearing nut 25 attached to the distal end of the fixed housing 15. Have been. A mechanical seal (floating seal) 20 is provided outside the main bearing 50, and seals a later-described lubricating oil 43 filled in the rotating housing 17 by the mechanical seal 20. An annular flange portion 10A is integrally formed on the outer peripheral side of the drum body 10, and a drive wheel (sprocket) 7 meshing with the crawler belt 8 is fixed to the flange portion 10A using a bolt 18. . As shown in FIG. 2, the length of the traveling device 9 in the axial direction is set shorter than the width of the crawler belt 8, so that the entire traveling device 9 fits within the width of the crawler belt 8.

  The drum 11 is fixed to the drum main body 10 using bolts 19, and on the inner peripheral side of the drum 11, an internal gear 11A with which first to third planetary gears 27, 33, and 39 described later mesh is provided. ing.

  The bottom cover 16 is fixed to the opening end of the drum 11 using bolts 21. Inside the bottom cover 16, a liner 22 located at the center of the shaft and slidingly contacting a tip end surface of a first sun gear 26 described later. Are fitted.

  The reduction gear transmission 14 reduces the rotation of the hydraulic motor 12 and transmits the reduced rotation to the rotating housing 17. The fixed housing 15, the rotating housing 17, the first-stage planetary gear mechanism 23, and the second-stage planetary gear The mechanism 31 includes a third stage (final stage) planetary gear mechanism 37 and the like.

  The first-stage planetary gear mechanism 23 reduces the rotation of the hydraulic motor 12 and transmits the reduced rotation to the second-stage planetary gear mechanism 31. The rotation shaft 24, the first sun gear 26, the first planetary gear 27, It is composed of a first carrier 28 and the like.

  The shaft side spline portion 24A is provided on the base end side of the rotating shaft 24. As described above, the shaft side spline portion 24A is splined to the hole side spline portion 13A provided on the output shaft 13 of the hydraulic motor 12. Are combined. That is, the rotating shaft 24 is disposed coaxially with the output shaft 13 of the hydraulic motor 12 and rotates integrally with the output shaft 13 of the hydraulic motor 12.

  The first sun gear 26 is provided on the tip end side of the rotating shaft 24, and the first planetary gear 27 meshes with the first sun gear 26 and an internal gear 11 </ b> A provided on the inner peripheral side of the drum 11. . The first planetary gears 27 revolve around the first sun gear 26 while rotating, and are provided, for example, three around the first sun gear 26 (only one is shown).

  The first carrier 28 is a disk-shaped member having a diameter smaller than the diameter of the addendum of the internal gear 11 </ b> A, and has a shaft insertion hole in the center of which the rotation shaft 24 is inserted. The first carrier 28 rotatably supports each first planetary gear 27 via a bearing 29 and a pin 30. Each first planetary gear 27 revolves while rotating around the first sun gear 26. The orbit is transmitted to the second sun gear 32 of the planetary gear mechanism 31 at the next stage.

  The second-stage planetary gear mechanism 31 reduces the rotation of the first-stage planetary gear mechanism 23 and transmits the reduced rotation to the third-stage planetary gear mechanism 37. The second sun gear 32 and the second planetary gear 33 , The second carrier 34 and the like.

  The second sun gear 32 has a shaft insertion hole through which the rotating shaft 24 is inserted at the center, and the second sun gear 32 is spline-coupled to the first carrier 28 of the first stage. A plurality of second planetary gears 33 are arranged so as to mesh with the second sun gear 32 and the internal gear 11 </ b> A (only one is shown), and revolve around the second sun gear 32 while rotating.

  The second carrier 34 is a disk-shaped member having a diameter smaller than the diameter of the addendum of the internal gear 11 </ b> A, and has a shaft insertion hole through which the rotating shaft 24 is inserted at the center. The second carrier 34 rotatably supports each second planetary gear 33 via a bearing 35 and a pin 36, and each second planetary gear 33 revolves while rotating around the second sun gear 32. The orbit is transmitted to the third sun gear 38 of the final stage planetary gear mechanism 37.

  The final stage (third stage) planetary gear mechanism 37 reduces the rotation of the second stage planetary gear mechanism 31 and transmits the reduced rotation to the drum 11 of the rotary housing 17. It comprises a planetary gear 39, a third carrier 40 and the like.

  The third sun gear 38 has a shaft insertion hole through which the rotating shaft 24 is inserted at the center, and the third sun gear 38 is spline-coupled to the second carrier 34 in the second stage. The third planetary gear 39 meshes with the third sun gear 38 and the internal gear 11A, and a plurality of, for example, three, are arranged so as to rotate around the third sun gear 38 (only one is shown). .

  The third carrier 40 is a disk-shaped member having a diameter smaller than the diameter of the addendum of the internal gear 11 </ b> A, and has a shaft insertion hole in the center of which the rotary shaft 24 is inserted. The third carrier 40 rotatably supports each third planetary gear 39 via a bearing 41 and a pin 42. An inner surface of an annular projection 40A protruding from one end face of the third carrier 40 toward the hydraulic motor 12 side. Is formed with a hole side spline portion 40B. The third carrier 40 is attached to the fixed housing 15 in a non-rotating state by spline-connecting the hole side spline portion 40B and the shaft side spline portion 15E of the fixed housing 15.

  As a result, when the hydraulic motor 12 operates and the output shaft 13 rotates, the rotation of the output shaft 13 is caused by the rotation of the rotation shaft 24, the sun gear 26, the first planetary gear 27, the first carrier 28, etc. The speed is reduced at a predetermined reduction ratio by the gear mechanism 23, and only the revolution of the first planetary gear 27 is output from the first carrier 28 to the second sun gear 32 of the second-stage planetary gear mechanism 31.

  Then, the second stage planetary gear mechanism 31 including the second sun gear 32, the second planetary gear 33, the second carrier 34, and the like further reduces the rotation from the first carrier 28 at a predetermined reduction ratio, and Only the revolution of the planetary gear 33 is output from the second carrier 34 to the third sun gear 38 of the planetary gear mechanism 37 at the final stage (third stage).

  Further, in the final stage planetary gear mechanism 37 including the third sun gear 38, the third planetary gear 39, the third carrier 40, and the like, the third carrier 40 is attached to the stationary housing 15 in a non-rotating state. Therefore, the rotation output from the second carrier 34 is transmitted from the third sun gear 38 to the drum 11 via the third planetary gear 39 while being reduced at a predetermined reduction ratio. As a result, the rotating housing 17 including the drum 11, the drum body 10, the bottom cover 16 and the like rotates with a large torque, and the crawler belt 8 wound around the idler wheel 6 and the driving wheel 7 is driven to circulate, whereby the hydraulic pressure is increased. The excavator 1 runs.

  In the traveling device 9 configured as described above, the lubricating oil 43 for smoothly driving each of the gears provided in the first to third planetary gear mechanisms 23, 31, and 37 is provided inside the rotation side housing 17. The lubricating oil 43 is filled up to the vicinity of a horizontal plane passing through the central axis of the rotating shaft 24 (the straight line P shown in FIG. 3).

  Here, the oil level of the lubricating oil 43 is such that the lubricating oil 43 is agitated by the rotation of each of the planetary gear mechanisms 23, 31, and 37 when the vehicle (the traveling body 2) is stopped or running at a low speed for a short time. Because the scattering action is small, the lower part of the spline connection part S (the connection point between the hole side spline part 13A and the shaft side spline part 24A) between the output shaft 13 and the rotary shaft 24 of the hydraulic motor 12 is kept immersed in the lubricating oil 43. become. However, when the vehicle is running at high speed for a long time, the lubricating oil 43 sticks to the internal gear 11A of the drum 11 due to the action of viscosity or centrifugal force, and the oil level of the lubricating oil 43 is lowered accordingly. There is a possibility that the spline joint between the output shaft 13 and the rotary shaft 24 may be completely exposed from the oil level of the lubricating oil 43.

  In the speed reducer 14 according to the first embodiment of the present invention, in order to solve such a problem, the third carrier 40 of the final stage planetary gear mechanism 37 includes the third sun gear 38 and the third planetary gear 39. A supply path 44 facing the meshing portion is provided. Hereinafter, the supply path 44 will be described in detail with reference to FIGS. 4 and 5.

  FIG. 4 is a cross-sectional view showing a main part of the reduction gear transmission 14 according to the first embodiment provided in the traveling device 9, and FIG. 5 is an explanatory diagram viewed from the direction of arrow A in FIG.

  In the reduction gear transmission 14 according to the first embodiment, a through hole 45 is formed in the third carrier 40 at the final stage, and the through hole 45 is provided between the cylindrical portion 15A of the fixed housing 15 and the third carrier 40. The through-hole 45 and the space 46 constitute a supply path 44 (see FIG. 3) by communicating with the existing space 46.

  As shown in FIG. 5, the through hole 45 is formed in a long hole shape so as to face the meshing portion between the third sun gear 38 and the third planetary gear 39, and the through hole 45 is formed inside the rotation side housing 17. Is located above the oil level of the lubricating oil 43 filled in. The space 46 is located around a spline joint S where the hole side spline 13A of the output shaft 13 and the shaft spline 24A of the rotary shaft 24 are joined. It communicates with the upper space 46. That is, the inlet of the supply path 44 is located at the meshing portion between the third sun gear 38 and the third planetary gear 39, and the outlet of the supply path 44 is located above the spline connection S between the output shaft 13 and the rotating shaft 24. ing.

  In the speed reducer 14 having such a supply path 44, when the hydraulic motor 12 rotates, the third planetary gear 39 meshing with the third sun gear 38 rotates while meshing with the internal gear 11A, and these third sun gears 38 rotate. Then, the lubricating oil 43 attached to the tooth surface of the meshing portion of the third planetary gear 39 is jetted in the axial direction. The lubricating oil 43 enters the space 46 through the through hole 45 that is the inlet of the supply path 44, and is supplied to the spline joint S from the lower end of the space 46 that is the outlet of the supply path 44. Therefore, even when the vehicle is running at high speed for a long time, the third sun gear 38 and the third planetary gears are connected to the spline joint S between the hole side spline portion 13A of the output shaft 13 and the shaft side spline portion 24A of the rotary shaft 24. The lubricating oil 43 squirting from the meshing portion of the gear 39 is supplied, so that a reduction in the life of the spline connecting portion S can be suppressed.

  As described above, in the reduction gear transmission 14 according to the first embodiment, the third carrier 40, which is a component of the planetary gear mechanism 37 in the final stage, is fixedly supported by the fixed housing 15, and Because the through hole 45 facing the meshing portion between the third sun gear 38 and the third planetary gear 39 is provided in the third carrier 40 and the through hole 45 communicates with the space 46 above the spline coupling portion S. Even if the oil level of the lubricating oil 43 drops when the vehicle is running at high speed for a long time, the lubricating oil 43 spouting from the meshing portion between the third sun gear 38 and the third planetary gear 39 is supplied to the spline connection portion S. Can be. Therefore, the lubricating oil 43 can be supplied to the spline connection portion S during high-speed and long-time running without increasing the filling amount of the lubricating oil 43, which causes problems such as a decrease in running efficiency and an increase in the cost of the lubricating oil 43. Without this, it is possible to suppress a decrease in the life of the spline connection portion S.

  FIG. 6 is a cross-sectional view of a traveling device provided with a reduction gear according to the second embodiment, and portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals.

  In the reduction gear transmission 14 according to the second embodiment shown in FIG. 6, the depth dimension D (the length along the axial direction of the fixed housing 15) of the space portion 46 communicating with the through hole 45 is smaller than that of the first embodiment. The lower end of the space 46 is opposed to a position slightly shifted from the tip of the output shaft 13 provided with the hole side spline portion 13A to the other end in the axial direction. That is, the lower end of the space portion 46 that is the outlet of the supply path 44 is located directly above the shaft-side spline portion 24A of the rotating shaft 24 exposed from the spline connection portion S. The other configuration is basically the same as that of the first embodiment.

  In the speed reducer 14 according to the second embodiment configured as described above, the lubricating oil 43 squirted from the meshing portion of the third sun gear 38 and the third planetary gear 39 flows from the through hole 45 through the space 46. Since the lubricating oil 43 is efficiently supplied to the shaft-side spline portion 24A of the rotary shaft 24 at the pinpoint, the lubricating oil 43 is guided to the hole-side spline portion 13A and the shaft-side spline portion 24A to be connected at the spline connection portion S, and the spline connection is performed. A reduction in the life of the portion S can be suppressed.

  FIG. 7 is a cross-sectional view of a traveling device provided with a reduction gear according to the third embodiment, and portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals.

  In the speed reducer 14 according to the third embodiment shown in FIG. 7, a tapered through hole 47 is formed in the third carrier 40, and the supply path 44 is configured by the through hole 47 and the space 46. ing. The through hole 47 has a tapered through hole in which the opening diameter on the outlet side facing the space 46 is smaller than the opening diameter on the inlet side facing the meshing portion of the third sun gear 38 and the third planetary gear 39. Has become. The other configuration is basically the same as that of the first embodiment.

  In the speed reducer 14 according to the third embodiment configured as described above, the lubricating oil 43 squirted from the meshing portion between the third sun gear 38 and the third planetary gear 39 passes through the space portion 46 from the through hole 47. The lubricating oil 43 spouted from the meshing portion is converged by the tapered through hole 47 because the through hole 47 is tapered to reduce the opening diameter on the outlet side. Can be efficiently sent to the space 46. Accordingly, the lubricating oil 43 can be supplied to the spline joint S between the output shaft 13 and the rotating shaft 24 even during high-speed and long-time running, and a reduction in the life of the spline joint S can be suppressed.

  FIG. 8 is a cross-sectional view of a traveling device provided with a reduction gear according to the fourth embodiment, and portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals.

  In the reduction gear transmission 14 according to the fourth embodiment shown in FIG. 8, an inclined hole 48 is formed in the third carrier 40, and the supply path 44 is configured by the inclined hole 48. The inclined hole 48 is provided inside a bulged portion 40 </ b> C protruding from the end surface of the third carrier 40, and the bulged portion 40 </ b> C enters the lower end of the space 46. One end of the inclined hole 48 faces the meshing portion between the third sun gear 38 and the third planetary gear 39, the other end of the inclined hole 48 faces near the spline joint S, and the inclined hole 48 has one end. It slopes down from the opening on the (inlet) side to the opening on the other end (outlet) side. The other configuration is basically the same as that of the first embodiment.

  In the speed reducer 14 according to the fourth embodiment configured as described above, the lubricating oil 43 squirted from the meshing portion between the third sun gear 38 and the third planetary gear 39 passes obliquely downward inside the inclined hole 48. Thus, even when the vehicle is running at high speed for a long time, it is possible to suppress a decrease in the life of the spline coupling portion S.

  FIG. 9 is a cross-sectional view of a traveling device provided with a speed reducer according to a fifth embodiment, and FIG. 10 is an explanatory diagram of a final stage carrier provided in the speed reducer as viewed from a hydraulic motor side. Corresponding parts are denoted by the same reference numerals.

  In the reduction gear transmission 14 according to the fifth embodiment shown in FIG. 9, a slit 49 is provided in the third carrier 40 instead of the through hole 45, and the slit 49 and the space 46 constitute the supply path 44. ing. As shown in FIG. 10, the upper end of the slit 49 is located at a position facing the meshing portion between the third sun gear 38 and the third planetary gear 39, and the lower end of the slit 49 is provided at the center of the third carrier 40. The shaft insertion hole 40D. The slit 49 can be easily formed in the third carrier 40 by cutting or the like, and by adjusting the slit width W of the slit 49, it is possible to easily control the ejection flow rate of the lubricating oil 43. The other configuration is basically the same as that of the first embodiment.

  In the speed reducer 14 according to the fifth embodiment configured as described above, the lubricating oil 43 squirting from the meshing portion of the third sun gear 38 and the third planetary gear 39 is splined from the slit 49 through the space 46. Since it is supplied to the connecting portion S, it is possible to suppress a decrease in the life of the spline connecting portion S even during high-speed and long-time running.

  FIG. 11 is a cross-sectional view of a traveling device provided with a speed reducer according to the sixth embodiment, and portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals.

  In the reduction gear transmission 14 according to the sixth embodiment shown in FIG. 11, the bearing nut 25 is fastened to the distal end side of the fixed housing 15, and the bearing nut 25 is locked using a screw member 51 in order to prevent the bearing nut 25 from rotating. The nut 25 is fixed to the inner ring of the main bearing 50. The screw member 51 is not connected to the third carrier 40, and the third carrier 40 is attached to the fixed housing 15 in a non-rotating state by spline-connecting the hole side spline portion 40B to the shaft side spline portion 15E. ing. The other configuration is basically the same as that of the first embodiment.

  In the reduction gear transmission 14 according to the sixth embodiment configured as described above, the bearing nut 25 is prevented from rotating using the screw member 51 that is separate from the third carrier 40. Irrespective of this, the through hole 45 serving as the inlet of the supply path can be easily set at the optimum position above the oil level of the lubricating oil 43.

  In each of the embodiments described above, the case where the rotation of the hydraulic motor 12 is reduced by the first to third planetary gear mechanisms 23, 31, and 37 and transmitted to the rotating housing 17 has been described. The number of mechanisms is not limited to three if it is two or more.

  The above-described embodiments are merely examples for describing the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Traveling body 3 Upper revolving superstructure 4 Working device 5 Track frame 6 Idle wheel 7 Drive wheel 8 Crawler belt 9 Traveling device 10 Drum main body 11 Drum 11A Internal gear 12 Hydraulic motor (rotation source)
DESCRIPTION OF SYMBOLS 13 Output shaft 13A Hole side spline part 14 Reduction gear 15 Fixed side housing 15A Cylindrical part 16 Bottom cover 17 Rotation side housing 23 First stage planetary gear mechanism 24 Rotation axis 24A Shaft side spline part 25 Bearing nut 26 First sun gear 27 First planetary gear 28 First carrier 31 Second stage planetary gear mechanism 32 Second sun gear 33 Second planetary gear 34 Second carrier 37 Third stage (final stage) planetary gear mechanism 38 Third sun gear 39 Third Planetary gear 40 Third carrier (final stage carrier)
40C Swelling part 40D Shaft insertion hole 43 Lubricating oil 44 Supply path 45 Through hole 46 Space 47 Through hole 48 Inclined hole (Supply path)
49 Slit 50 Main bearing 51 Screw member S Spline joint

Claims (9)

A fixed-side housing, a rotation source provided in the fixed-side housing, a rotation-side housing rotatably supported by the fixed-side housing, one end of which is spline-coupled to the rotation source, and the other end of which is the rotation-side housing. A rotation shaft supported by the rotation shaft, and a plurality of stages of planetary gear mechanisms for reducing the rotation of the rotation shaft and transmitting the rotation to the rotation side housing, wherein the rotation side housing is filled with lubricating oil. ,
The carrier of the last stage of the planetary gear mechanism is fixedly supported by the fixed side housing, and the carrier is provided with a supply path facing the meshing portion of the sun gear and the planetary gear of the last stage of the planetary gear mechanism. The lubricating oil attached to the meshing portion between the sun gear and the planetary gear is supplied to the spline coupling portion between the rotation source and the rotation shaft through the supply path with the rotation of the rotation source. A speed reducer characterized by the above-mentioned. The reduction gear according to claim 1,
A speed reducer, wherein an outlet at a lower end of the supply path faces the spline joint at a position shifted to the other end of the rotating shaft. The reduction gear according to claim 1,
The supply path has a through hole formed in the carrier, and the opening of the through hole on the rotation source side is at a position lower than at least the same height as the opening on the engagement portion side. A speed reducer characterized by being set. The reduction gear transmission according to claim 3,
The reduction gear, wherein the through-hole is a tapered hole having an opening diameter on the rotation source side smaller than an opening diameter on the engagement portion side. The reduction gear according to claim 1,
The supply path has an inclined hole formed in the carrier,
The reduction gear, wherein the inclined hole is inclined with a downward slope from the opening on the engagement portion side toward the opening on the rotation source side. The reduction gear according to claim 1,
A reduction gear, wherein an insertion hole through which the rotating shaft is inserted is provided in the carrier, and the supply path has a slit reaching an outer peripheral edge of the insertion hole. The reduction gear transmission according to claim 2,
The supply path has a through hole formed in the carrier, and the opening of the through hole on the rotation source side is at a position lower than at least the same height as the opening on the engagement portion side. A speed reducer characterized by being set. The reduction gear transmission according to claim 7,
The reduction gear, wherein the through-hole is a tapered hole having an opening diameter on the rotation source side smaller than an opening diameter on the engagement portion side. The reduction gear transmission according to claim 2,
The supply path has an inclined hole formed in the carrier,
The reduction gear, wherein the inclined hole is inclined with a downward slope from the opening on the engagement portion side toward the opening on the rotation source side.

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