JP2585579Y2 - Reduction gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reduction gear for an industrial machine, and more particularly to a final reduction gear for an industrial vehicle, a construction vehicle, and the like.

[Conventional technology]

Conventionally, when a large reduction ratio (7 to 9 or more) is required in a reduction gear transmission, a combination of a spur gear reduction gear and a planetary gear reduction gear, or a two-stage combination of a planetary gear reduction gear, or It employs a multi-stage reduction mechanism that combines more reduction gears.

FIG. 2 is a cross-sectional view of a conventional hydraulically driven final reduction gear of a crawler type construction vehicle.
Are fastened by bolts 3.

A hub 32 is rotatably mounted on the shaft 31 via a bearing 5. The sprocket 6 is fastened to the hub 32 by bolts 7, and the internal gear 33 is covered with a cover 34.
And is fastened by a bolt 35. The output pinion 41 of the hydraulic motor 40 fixed to the shaft 31 is
And a large gear 42 axially mounted by a bearing 43 to form a spur gear reducer. A sun gear 44 is connected to the large gear 42 by a spline 45. A carrier 50 is connected to the shaft 31 by a spline 51.
Is mounted with a shaft 52 on which a planetary gear 53 is mounted by a bearing 54. The planetary gear 53 meshes with the internal gear 33 and the sun gear 44 to form a planetary gear reducer.

When the hydraulic motor 40 is driven, the rotation of the output pinion 41 is
The sprocket 6 is driven by being reduced in speed by the aforementioned spur gear reducer and planetary gear reducer.

[Problems to be solved by the invention]

According to the above configuration, since the configuration is made by combining the spur gear reducer and the planetary gear reducer, the following problems occur.

(1) The length L3 from the center of the sprocket to the end face of the hydraulic motor is large, and the field of the final reduction gear is large. Therefore, the total width L4 is also large, and it is difficult to store the data within the crawler belt width (so-called in-shoot), so that the hydraulic motor may be damaged by contact with an obstacle during traveling.

(2) The number of items is large, the weight is heavy, and the cost is high.

The present invention has been made in view of the above problems, and has as its object to provide a compact, lightweight, low-cost reduction gear having a small overall width.

[Means for solving the problem]

To achieve the above object, the reduction gear transmission according to the present invention has a hollow shaft fixed to a track frame, a rotation output member rotatably mounted on the outer periphery of the shaft via a bearing, and a rotation output member attached to the shaft. An internal gear, a sun gear driven by a drive source attached to the hollow interior of the shaft,
A planetary gear integrally formed with a large gear meshing with the sun gear and a small gear meshing with the internal gear, and arranged in parallel in the axial direction, and a carrier on which the planetary gear is rotatably mounted. In the reduction gear transmission, the inner gear of the shaft, and an internal gear disposed at a position overlapping with the bearing in the axial direction of the shaft, rotatably sandwiches the planetary gear, and
One end side to be sandwiched is composed of a carrier fixed to the rotation output member, and the power from the drive source is reduced and output to the rotation output member via the sun gear, the planetary gear, and the carrier.

[Action]

According to the above configuration, (a) the power from the drive source is meshed with the small gear from the large gear meshed with the sun gear via the small gear formed integrally with the large gear, and is attached to the shaft. After being transmitted to the internal gear, the rotation is reduced and output to a rotation output member integrally formed with the carrier via a carrier that supports a planetary gear including a large gear and a small gear. (B) The planetary gear meshing with the internal gear disposed on the inner periphery of the shaft and the other end of the carrier holding the planetary gear are housed in the carrier, and one of the carriers holding the planetary gear. Since the end side also serves as the cover of the speed reducer, the width of the speed reducer can be reduced by the width, and the speed reducer easily fits within the width of the crawler belt.

(C) Since the thrust force and the radial force acting on the carrier are securely supported by the shaft from the rotary output member via the bearing, the carrier is prevented from rattling.
In addition, the meshing between the planetary gear supported by the carrier and the internal gear disposed on the inner periphery of the shaft is prevented by a backlash between the inner and outer peripheral surfaces of the internal gear, so that each contact is prevented. The uneven wear of the gears is reduced, and no additional thrust receiver acting on the carrier is required.

〔Example〕

Hereinafter, embodiments of the reduction gear transmission according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. A shaft 2 is fastened to a track frame 1 by bolts 3. A hub 4 to which a sprocket 6 is fastened with a bolt 7 is mounted on the shaft 2 via a bearing 5. The hydraulic motor 10 is fixed to the center of the shaft 2, and a sun gear 12 is connected to the output shaft 11 by a spline 13. An internal gear 14 is connected to the inner periphery of the shaft 2 by a spline 15, and is fixed by a snap ring 16, a plate 17, and a bolt 18. Carrier 20 has bolt 21 on hub 4
A planetary gear 23 is axially attached to the carrier 20 by a shaft 22 via a bearing 26. Planet gear 23 is a large gear
The large gear 24 meshes with the sun gear 12, and the small gear 25 meshes with the internal gear 14.

Next, the operation will be described. When the hydraulic motor 10 is driven, the sun gear 12 drives the large gear 24 of the planetary gear 23 at a reduced speed. The small gear 25 of the planetary gear 23 revolves while rotating on the inner periphery of the internal gear 14. That is, the carrier 20 revolves integrally with the hub 4. In this case, the reduction ratio between the sun gear 12 and the hub 4 is the reduction ratio of the reduction ratio of the general one-stage planetary reduction gear because the planetary gear 23 is constituted by the large gear 24 and the small gear 25.
The speed reduction ratio is 1.2 to 1.5 times, and a reduction ratio equivalent to that of the conventional reduction gear combining the spur gear reduction gear and the planetary gear reduction gear can be obtained.

[Effect of the invention]

As described in detail above, the present invention has the following effects.

(1) Since the speed reducer easily fits within the width of the crawler belt, the speed reducer is protected from obstacles such as rocks, that is, so-called speed reducers can be made into shoes, and the durability of the speed reducer is improved.

(2) The backlash of the carrier is prevented, and the uneven wear of each gear is reduced, so that the durability of the reduction gear is improved. In addition, since the thrust receiver acting on the carrier is not separately required, the structure of the reduction gear is reduced. Simplified.

[Brief description of the drawings]

 FIG. 1 is a sectional view of the speed reducer of the present invention, and FIG. 2 is a sectional view of a conventional speed reducer. 1 Track frame 2 Shaft 4 Hub 10 Hydraulic motor 12 Sun gear 14 Internal gear 20 Carrier 22 Shaft 23 Planetary gear

Claims (1)

(57) [Scope of request for utility model registration] 1. A hollow shaft fixed to a track frame, a rotation output member rotatably mounted on the outer periphery of the shaft via a bearing, an internal gear mounted on the shaft, and a hollow inside of the shaft. A sun gear driven by a drive source attached to the gear, a large gear meshing with the sun gear, and a small gear meshing with the internal gear are integrally formed, and a planetary gear arranged in parallel in the axial direction. And a carrier having a planetary gear rotatably mounted thereon, wherein the internal gear is disposed on the inner periphery of the shaft and overlapped with the bearing in the axial direction of the shaft, and the planetary gear is rotated. A carrier that is freely pinched and has one end fixed to a rotary output member, and the power from the drive source is reduced and output to the rotary output member via a sun gear, a planetary gear, and a carrier. Do Reduction gear according to claim.