JP7203631B2 - gearbox and carrier - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gear device having a planetary gear mechanism and a carrier that supports the planetary gear.

Patent Literature 1 discloses a gear device with two planetary gear mechanisms. This gearing is configured as a speed reducer and reduces the rotation transmitted from the hydraulic motor by means of two planetary gear mechanisms.

The gear device of Patent Document 1 includes a hydraulic motor, a first planetary gear mechanism, and a second planetary gear mechanism. The hydraulic motor has a motor shaft extending from a tubular casing. A hydraulic motor rotates a motor shaft with hydraulic oil supplied in a casing.

The first planetary gear mechanism includes a first sun gear provided at the tip of the motor shaft of the hydraulic motor, and a plurality of first planetary gears arranged around the first sun gear so as to mesh with the first sun gear. and a rotary carrier including a plurality of columnar support portions that support the first planetary gear. The rotary carrier is rotatably arranged with respect to the motor shaft at a position closer to the casing than the first sun gear.

The second planetary gear mechanism includes a second sun gear rotatably provided on a portion of the motor shaft closer to the casing than the first sun gear, and arranged around the second sun gear so as to mesh with the second sun gear. and a fixed carrier having a plurality of columnar supports for supporting the second planetary gears. A fixed carrier is fixed to the casing.

A spline is provided on the inner peripheral surface of the rotating carrier, and this spline meshes with the second sun gear. Also, the first planetary gear and the second planetary gear mesh with a common internal gear.

With the above configuration, in the gear device of Patent Document 1, when the motor shaft rotates, the first planetary gear revolves around the first sun gear due to the rotation of the first sun gear, and the first planetary gear revolves around the first sun gear. The motion causes the rotating carrier to rotate. After that, the rotation of the rotary carrier causes the second sun gear to rotate, and the rotation of the second sun gear causes the second planetary gear to revolve around the second sun gear. The revolving motion of the second planetary gear rotates the internal gear.

Japanese Utility Model Laid-Open No. 9-240525

In a gear device having a plurality of planetary gear mechanisms, an increase in the number of parts makes it difficult to create a lubricating oil supply route. Therefore, a structure capable of forming a good lubrication state as simply as possible is desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gear device and a carrier capable of easily forming a good lubrication state in the gear device.

A gear device according to the present invention includes a sun gear, a plurality of planetary gears arranged around the sun gear so as to mesh with the sun gear, and a support portion supporting each of the plurality of planetary gears. a planetary gear mechanism comprising: a carrier that rotates with the revolving motion of the plurality of planetary gears around the first sun gear and has a through portion between the adjacent support portions; and a carrier that faces the through portion. and another planetary gear mechanism arranged.

The second planetary gear mechanism, wherein the other planetary gear mechanism comprises another sun gear and another planetary gear arranged around the other sun gear so as to mesh with the other sun gear, The through portion may face a part of the orbit that the other planetary gear draws around the other sun gear.

The through portion may have a tapered shape in which the cross-sectional area increases toward the other planetary gear mechanism.

The penetrating portion may have a sector shape whose circumferential length increases outward in a radial direction with respect to the center of rotation of the sun gear.

Further, a carrier according to the present invention is a carrier that constitutes a planetary gear mechanism together with a sun gear and a plurality of planetary gears around the sun gear, wherein support portions that support each of the plurality of planetary gears are adjacent to each other. a penetrating portion provided between the supporting portions, the penetrating portion being arranged to face another planetary gear mechanism.

In the carrier according to the present invention, the penetrating portion may be arranged to face a part of the revolution orbit drawn by the planetary gear of the other planetary gear mechanism around the corresponding sun gear.

The through portion may have a tapered shape in which the cross-sectional area increases toward the other planetary gear mechanism.

The penetrating portion may have a sector shape whose circumferential length increases radially outward with respect to the center of rotation of the sun gear that constitutes the planetary gear mechanism.

Further, another gear device according to the present invention includes a first sun gear, a plurality of first planetary gears arranged around the first sun gear so as to mesh with the first sun gear, and the plurality of first planetary gears. 1. A carrier that includes support portions that support each of the planetary gears, that rotates as the plurality of first planetary gears revolve around the first sun gear, and that has a penetrating portion between the adjacent support portions. a first planetary gear mechanism comprising: a second sun gear; and a plurality of second planetary gears arranged around the second sun gear so as to mesh with the second sun gear; and a second planetary gear mechanism arranged so that the portion and the second planetary gear face each other.

ADVANTAGE OF THE INVENTION According to this invention, the favorable lubricating state in a gear apparatus can be easily formed.

1 is a schematic cross-sectional view of a gear device according to an embodiment of the invention; FIG. 2 is a perspective view of a carrier of a first planetary gear mechanism that constitutes the gear device shown in FIG. 1; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG.

An embodiment of the present invention will be described below.

FIG. 1 is a schematic cross-sectional view of a gear device 1 according to this embodiment. Elements shown in FIG. 1 and other drawings used in the following description may include elements whose sizes, scales, and the like are shown differently from the actual ones in order to facilitate understanding. Further, the gear device 1 described below is configured as a device that reduces the rotation output from the hydraulic motor 10, and can be used as a device that drives a traveling device of construction machinery, for example. However, the gear device 1 may be used in other working machines, and its use is not particularly limited.

The gear device 1 includes a first planetary gear mechanism PG1, a second planetary gear mechanism PG2, and a first planetary gear mechanism PG1 and a second planetary gear mechanism PG2 that cover the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. and a rotating casing RC that also serves as an internal gear. In the gear device 1, the rotation output from the motor shaft 14 of the hydraulic motor 10 is decelerated by the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2, and the decelerated rotation is transmitted to the rotating casing RC to rotate the rotating casing RC. RC rotates. As a result, the driven portion (not shown) coupled to the flange portion 30 provided on the rotary casing RC can be driven. The configuration of the hydraulic motor 10 is not particularly limited, and for example, a swash plate type piston pump can be used as the hydraulic motor 10 .

The first planetary gear mechanism PG<b>1 includes a first sun gear 15 , a plurality of first planetary gears 16 , and a first carrier 17 that supports the plurality of first planetary gears 16 . The second planetary gear mechanism PG2 includes a second sun gear 19, a plurality of second planetary gears 20, and a second carrier/motor fixing portion 21 that supports the plurality of second planetary gears 20 and fixes the hydraulic motor 10. , provided.

In the present embodiment, the second carrier/motor fixing portion 21 has a function of supporting the second planetary gear 20 and a function of fixing the hydraulic motor 10 to the gear device 1, that is, integrally incorporating the same. The motor shaft 14 of the hydraulic motor 10 extends from the second carrier/motor fixing portion 21 toward the first planetary gear mechanism PG1 and the second planetary gear mechanism PG2. It is coupled to the planetary gear mechanism PG1. In this embodiment, the carrier portion of the second planetary gear mechanism PG2 that supports the second planetary gear 20 is integrated with the portion that fixes the hydraulic motor 10, but may be configured as different members.

The rotating casing RC has a hollow cylindrical shape, and the end portion of the second carrier/motor fixing portion 21 is inserted into the inner side of the opening portion on one side in the axial direction. The opening on the other side of the rotary casing RC is closed with a lid 22 . The rotating casing RC is rotatably held by the second carrier/motor fixing portion 21 via casing bearings 28 (28a, 28b), and rotates about the rotation axis A. As shown in FIG. The rotation axis A of the rotary casing RC coincides with the rotation axis (center axis) of the motor shaft 14 .

Lubricating oil is supplied to the inside of the rotating casing RC, and the lubricating oil supplied to the inside of the rotating casing RC lubricates the first planetary gear mechanism PG1 and the second planetary gear mechanism PG inside the rotating casing RC.

Internal teeth 13 are provided on the inner periphery of the rotary casing RC, and the internal teeth 13 mesh with the first planetary gear 16 and the second planetary gear 20 . That is, the rotary casing RC is configured as an internal gear. The internal teeth 13 may be formed integrally with the rotary casing RC, or may be formed separately and fixedly attached to the rotary casing 12 .

In the present embodiment, in the first planetary gear mechanism PG1, the first sun gear 15 is provided at the tip of the motor shaft 14 extending from the second carrier/motor fixing portion 21, and rotates integrally with the motor shaft 14. It rotates around axis A. A plurality of first planetary gears 16 are arranged around the first sun gear 15 so as to mesh with the first sun gear 15 . Each of the plurality of first planetary gears 16 is arranged between the first sun gear 15 and the internal teeth 13 and meshes with both the first sun gear 15 and the internal teeth 13 . Each first planetary gear 16 is rotationally driven with the rotation of the first sun gear 15 and revolves around the first sun gear 15 .

The first carrier 17 constitutes a planetary frame that holds the first planetary gears 16, and holds each of the plurality of first planetary gears 16 in a cantilevered state via a gear bearing 23 so as to be rotatable. there is Specifically, the first carrier 17 includes a disk-shaped base portion 35 and a plurality of columnar, particularly columnar support portions 29 (three support portions 29 in this embodiment) projecting from the base portion 35 . have. The base portion 35 is arranged on one side (that is, the left side in FIG. 1) of the plurality of first planetary gears 16 with respect to the axial direction Da in which the rotation axis A extends. The plurality of support portions 29 protrude from the base portion 35 from one side toward the other side in the axial direction Da, and rotatably hold each of the plurality of first planetary gears 16 via the gear bearing 23 .

The plurality of support portions 29 may be provided integrally with the base portion 35 or may be provided separately from the base portion 35 . As shown in FIG. 2 , the plurality of support portions 29 are arranged on the outer peripheral portion of the first carrier 17 with a uniform angle (that is, 120 degrees) shifted in the circumferential direction Dc. Correspondingly, the first planetary gears 16 supported by the respective support portions 29 are arranged with a uniform angle (that is, 120 degrees) in the circumferential direction Dc.

The plurality of support portions 29 receive circumferential force about the rotation axis A when the first planetary gear 16 revolves. As a result, the first carrier 17 rotates about the rotation axis A as the first planetary gear 16 revolves around the first sun gear 15 .

Further, in the present embodiment, through portions 40 are provided between adjacent support portions 29 in the first carrier 17 . The through portion 40 penetrates the first carrier 17 (specifically, the base portion 35) in the axial direction Da. In the present embodiment, as shown in FIG. 2, three penetrating portions 40 are provided with a uniform angle (that is, 120 degrees) in the circumferential direction Dc.

When viewed in the axial direction Da, the length of the penetrating portion 40 in the circumferential direction increases radially outward with respect to the rotation center of the first sun gear 15, in other words, radially outward with respect to the rotation axis A. It has a fan shape. More specifically, the inner peripheral side portion and the outer peripheral side portion of the inner peripheral surface of the penetrating portion 40 extending in the circumferential direction Dc form arcs centered on the rotation axis A, and the inner peripheral portion of the penetrating portion 40 Portions of the surface positioned on both sides in the circumferential direction form arcs extending along the concentric circles of the adjacent columnar support portions 29 .

The second planetary gear mechanism PG2 is arranged adjacent to the first planetary gear mechanism PG1 in the axial direction Da, and the through portion 40 is positioned to face the second planetary gear mechanism PG2. Here, the penetrating portion 40 has a tapered shape in which the cross-sectional area increases toward the second planetary gear mechanism PG2. FIG. 3 is a cross-sectional view along line III-III in FIG. 2, and is a cross-sectional view of the first carrier 17 cut along a curved surface extending in the circumferential direction Dc and the axial direction Da. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, and is a cross-sectional view of the first carrier 17 taken along a plane extending in the radial direction and the axial direction Da.

In the present embodiment, the inner peripheral side portion and the outer peripheral side portion of the inner peripheral surface of the penetrating portion 40 extending in the circumferential direction Dc are tapered such that the cross-sectional area increases toward the second planetary gear mechanism PG2. It's becoming Further, portions of the inner peripheral surface of the penetrating portion 40 located on both sides in the circumferential direction are also tapered such that the cross-sectional area increases toward the second planetary gear mechanism PG2. Note that the shape of the penetrating portion 40 is not particularly limited. For example, although the inner peripheral surface of the penetrating portion 40 in the present embodiment is wholly tapered, it may be partially tapered.

Returning to FIG. 1, a hollow portion is formed in the radial center portion of the flat base portion 35 of the first carrier 17, and this hollow portion is spline-connected to the end portion of the second sun gear 19. An internal tooth portion 37 is formed in the circumferential direction Dc.

The second planetary gear mechanism PG2 will be described below. The second sun gear 19 is formed in a cylindrical shape, and is inserted into a portion of the motor shaft 14 on one side (second carrier/motor fixing portion 21 side) of the first sun gear 15 in the axial direction Da. It is rotatably provided. The second sun gear 19 is arranged to face the first sun gear 15 with the first carrier 17 interposed therebetween. External teeth are formed on the outer circumference of the second sun gear 19, and the internal tooth portion 37 of the first carrier 17 is spline-coupled to the external teeth, and a plurality (three) of the second planetary gears 20 are meshed with the external teeth. ing.

Each of the three second planetary gears 20 is rotatably supported by columnar support portions 34 provided at three equally positioned positions in the circumferential direction Dc on the end face of the second carrier/motor fixing portion 21 . Each of the plurality of second planetary gears 20 is arranged between the second sun gear 19 and the internal teeth 13 and meshes with both the second sun gear 19 and the internal teeth 13 . Each second planetary gear 20 is rotationally driven with the rotation of the second sun gear 19 and revolves around the second sun gear 19 . The revolution of the second sun gear 19 rotates the rotary casing RC.

In FIG. 1, the area occupied by one second planetary gear 20 in the radial direction is indicated by symbol SA. The revolution orbit of the second planetary gear 20 during revolution is drawn by rotating the occupied area SA about the rotation axis A by 360 degrees. In the present embodiment, the orbit of the second planetary gear 20 and the penetrating portion 40 of the first carrier 17 face each other in the axial direction Da.

Next, operation of the gear device 1 will be described.

When the hydraulic motor 10 fixed to the second carrier/motor fixing portion 21 rotates the motor shaft 14 , the first sun gear 15 rotates along with the rotation of the motor shaft 14 . The first planetary gear 16 meshes with the internal teeth 13 and revolves around the first sun gear 15 . As the first planetary gear 16 rotates, the first carrier 17 rotates, and the second sun gear 19 spline-connected to the internal tooth portion of the first carrier 17 rotates. The rotation of the second sun gear 19 causes the second planetary gears 20 rotatably supported by the support portion 34 of the second carrier/motor fixing portion 21 to rotate, thereby rotating the second planetary gears 20 and the internal teeth. 13, the rotating casing RC rotates.

During the operation described above, inside the rotary casing RC, lubricating oil is applied to the meshing portion between the first sun gear 15 and the first planetary gear 16 in the first planetary gear mechanism PG1 and the second sun gear in the second planetary gear mechanism PG2. 19 and the second planetary gear 20, the meshing portion between the internal tooth portion of the first carrier 17 and the second sun gear 19, etc. are lubricated.

Here, in the present embodiment, lubricating oil present on the side where the support portion 29 protrudes from the first carrier 17 passes through the penetrating portion 40 to the second planetary gear mechanism PG2 side. At this time, since the first carrier 17 is rotating, it is possible to spread the lubricating oil over a wide range of the second planetary gear mechanism PG2. Since the lubricating oil supply path to the second planetary gear mechanism PG2 formed by the through portion 40 can be configured by providing the through portion 40 in a disk-shaped carrier that has been conventionally used, the structure becomes complicated. To realize a good lubricating state of the gear device 1 while suppressing the cost and processing cost. If the portion corresponding to the first carrier 17 is a conventional disk-shaped carrier, it is particularly difficult to lubricate the portion of the second planetary gear mechanism PG2 near the motor shaft 14. In this embodiment, a very good lubricating state can be achieved as compared with the conventional configuration.

Therefore, according to the present embodiment, a good lubricating state in the gear device 1 can be easily formed by the penetrating portion 40 of the first carrier 17 . Further, the through portion 40 of the first carrier 17 can also reduce the weight of the gear device 1 .

In addition, the through portion 40 faces a part of the revolution orbit drawn by the second planetary gear 20 around the second sun gear 19 . As a result, the lubricating oil flowing out from the through portion 40 toward the second planetary gear mechanism PG2 causes the meshing portion between the second sun gear 19 and the second planetary gear 20, the shaft supporting portion of the second planetary gear 20, and the second planetary gear mechanism PG2 to move. The external teeth of gear 20 can be effectively lubricated.

Further, the through portion 40 has a tapered shape in which the cross-sectional area increases toward the second planetary gear mechanism PG2. As a result, the lubricating oil can be smoothly passed to the second planetary gear mechanism PG2 side, and the lubricating oil can be effectively diffused over a wide range of the second planetary gear mechanism PG2.

Furthermore, the penetrating portion 40 has a sector shape whose circumferential length increases toward the outside in the radial direction with respect to the center of rotation of the first sun gear 15 . As a result, the lubricating oil smoothly passes to the second planetary gear mechanism PG2, and the proper rigidity of the first carrier 17 can be maintained while effectively diffusing the lubricating oil over a wide range of the second planetary gear mechanism PG2. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications may be made to the above-described embodiments.

Reference Signs List 1 gear device PG1 first planetary gear mechanism PG2 second planetary gear mechanism RC rotating casing 10 hydraulic motor 13 internal tooth 14 motor shaft 15 first sun gear 16 first planetary gear 17 first Carrier 19 Second sun gear 20 Second planetary gear 21 Second carrier/motor fixing portion 22 Lid 23 Gear bearing 28 Casing bearing 29 Support portion 30 Flange portion 34 Support portion 35 Base portion 37... Internal tooth portion 40... Through portion

Claims (9)

a sun gear; a plurality of planetary gears arranged around the sun gear so as to mesh with the sun gear; a planetary gear mechanism comprising a carrier that rotates with the revolution of the planetary gear and has a penetrating portion between the adjacent support portions;
and another planetary gear mechanism arranged to face the through portion. The other planetary gear mechanism comprises another sun gear and another planetary gear arranged around the other sun gear so as to mesh with the other sun gear,
2. The gear unit according to claim 1, wherein the through portion faces a portion of the orbit that the other planetary gear describes around the other sun gear. 3. The gear device according to claim 1, wherein said through portion has a tapered shape with a cross-sectional area increasing toward said other planetary gear mechanism. The gear device according to any one of claims 1 to 3, wherein the through portion has a sector shape whose circumferential length increases toward the outer side in the radial direction with respect to the center of rotation of the sun gear. A carrier that forms a planetary gear mechanism together with a sun gear and a plurality of planetary gears around the sun gear,
a support portion that supports each of the plurality of planetary gears;
and a penetrating portion provided between the adjacent support portions,
A carrier arranged such that the through portion faces another planetary gear mechanism. 6. The carrier of claim 5, wherein the carrier is arranged such that the penetration faces a portion of the orbit that the planetary gear of the other planetary gear mechanism describes about the corresponding sun gear. 7. The carrier according to claim 5, wherein said through portion has a tapered shape with a cross-sectional area increasing toward said other planetary gear mechanism. 8. The penetrating portion according to claim 5, wherein the through portion has a sector shape whose circumferential length increases toward the outer side in the radial direction with respect to the center of rotation of the sun gear that constitutes the planetary gear mechanism. career. a first sun gear; a plurality of first planetary gears arranged around the first sun gear so as to mesh with the first sun gear; and a support portion supporting each of the plurality of first planetary gears. and a carrier that rotates as the plurality of first planetary gears revolve around the first sun gear and has a through portion between the adjacent support portions;
a second sun gear; and a plurality of second planetary gears arranged around the second sun gear so as to mesh with the second sun gear, wherein the penetrating portion and the second planetary gear face each other. and a second planetary gear mechanism arranged in the .

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