JP2009057996A - Hydraulic motor with planetary gear type reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic motor with a planetary gear type reduction gear of which internal gear formed on an internal circumference surface of a main body is improved so as to have a long lifetime at low cost. <P>SOLUTION: The hydraulic motor 10 with the planetary gear type reduction gear is provided with a hydraulic motor 11 and a reduction gear 13 including a planetary gear mechanism 12 rotatably joined with the hydraulic motor 11. The planetary gear mechanism 12 comprises sun gears 25, 33, the internal gear 29, a planetary gear 35, and the like. Splines 37 are formed on an inner circumference surface of the main body 28, and the sun gear 25 and the internal gear 29 meshing with the planetary gear 35 are joined with the splines 37. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hydraulic motor with a reduction gear, and more particularly to a planetary gear type hydraulic motor with a reduction gear capable of reducing the cost of a planetary gear reduction gear.

The gear life of the planetary gear type hydraulic motor device with a reduction gear can be controlled by designing the life of the gear according to the design, but the use of high-strength material due to the size of the internal gear of the main body leads to high cost. Therefore, it was a neck part that was avoided and extended the life.
Therefore, in general, the internal gear of such a planetary gear type speed reducer has improved surface pressure strength and bending strength by subjecting cast iron to surface treatment or carburizing treatment of steel material. However, the cost of surface treatment and carburizing treatment of such a large internal gear increases depending on the mass of the target part. Therefore, in the two-stage planetary gear reducer, the tooth heights of the first gear and the second gear are reduced. It has been devised to reduce the mass of the internal gear by changing it according to the surface pressure (see Patent Document 1).
JP 11-37225 A

However, in the thing shown in patent document 1, since it has been forced to carburize a big internal gear main body as a means to improve the surface pressure strength and bending strength of the material calculated | required by a gear, the processing cost is still expensive. Become. Further, when the gear of the reduction gear reaches the end of its life, it is necessary to replace the main body itself, and thus it is necessary to remove the traveling motor device from the mechanical device.
The present invention has been made to solve the above-described problems, and overcomes the increase in material cost due to the increase in the internal gear main body and the high cost due to processing and heat treatment, thereby facilitating implementation and ease of workability. An object of the present invention is to provide a low-cost, long-life planetary gear type hydraulic motor with a reduction gear.

The invention according to claim 1 for solving the above-mentioned problem is a planetary gear type reduction gear-equipped hydraulic motor in which an axial piston type hydraulic motor and a planetary gear type reduction gear are combined.
A spline portion formed on the inner peripheral surface of the main body,
An internal gear fitted into the spline and fitted in the main body;
It is provided with.
According to the present invention, it is possible to provide a low-cost and long-life planetary gear-type hydraulic motor with a reduction gear that facilitates implementation and facilitates workability.

  The present invention can provide a planetary gear type hydraulic motor with a reduction gear having a long life without significantly increasing costs.

Hereinafter, preferred embodiments of a planetary gear type hydraulic motor with a reduction gear will be described in the present invention, and the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic longitudinal sectional view showing a schematic structure of a planetary gear type hydraulic motor 10 with a reduction gear according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. is there. The planetary gear type reduction gear-equipped hydraulic motor 10 includes a swash plate type axial piston type hydraulic motor 11 and a reduction gear 13 including a planetary gear mechanism 12 rotatably coupled to the hydraulic motor 11.
The speed reducer 13 is rotatably supported by a bearing 15 on the outer wall of the casing 14 of the hydraulic motor 11 and is attached so as not to move in the axial direction. A reduction gear chamber 16 which is a space in the reduction gear 13 is constituted by an oil seal 17, a floating seal 18, an O-ring 19 for the floating seal 18, and O-rings 20 to 22. The motor chamber 23 is secured in a sealed state. Lubricating oil is enclosed in the reduction gear chamber 16.

  The shaft 24 of the hydraulic motor 11 is coupled in the rotational direction by a first sun gear 25 and a spline 26. A plurality of, for example, three planetary gears 27 are arranged in the circumferential direction around the first sun gear 25 (only one is shown in FIG. 1). And a spline (spline part) 37 formed inside the main body 28 so as to be engaged with both teeth of the internal gear 29 and is rotatably held by a shaft 30. The shaft 30 is press-fitted into a carrier 31 and is coupled to the carrier 31 by a spring pin 32. The planetary gear mechanism 12 includes first and second sun gears 25 and 33, an internal gear 29, a planetary gear 35, and the like. The second sun gear 33 is coupled in the rotational direction by the carrier 31 and the spline part 34. A plurality of, for example, four planetary gears 35 are arranged in the circumferential direction around the second sun gear 33 (only one is shown in FIG. 1). And the internal gear 29 are arranged so as to mesh with each other, and are rotatably held by a shaft portion 36 integrated with the casing 14.

A spline (spline part) 37 is formed in the axial direction on the inner peripheral surface of the main body 28 on the opening side (left side in FIG. 1) of the reduction gear chamber 16, and an internal gear 29 is fitted to the spline 37. ing. In this case, the internal gear 29 can be made of a material that can extend the life strength of the gear regardless of the main body 28, for example, chrome molybdenum steel. Surface treatment and heat treatment can be performed.
On the other hand, since the main body 28 can use an inexpensive material, for example, cast iron, it is not necessary to frequently use a high-strength material. Furthermore, since the assembly is easy, the time required for the assembly work can be reduced.

The planetary gear type speed reducer-equipped hydraulic motor 10 according to the first embodiment of the present invention is basically configured as described above. Therefore, the power (rotation, torque) of the hydraulic motor 11 is determined by the shaft 24. The first sun gear 25, the planetary gear 27, the carrier 31, the second sun gear 33, and the planetary gear 35 are transmitted from the main body 28 through the spline 26 to the crawler (not shown) through the internal gear 29.
In the planetary gear type reduction gear-equipped hydraulic motor 10 according to the first embodiment, the internal gear 29 that meshes with the planetary gears 27 and 35 is not formed directly on the main body 28 but is formed on the inner peripheral surface of the main body 28. The spline 37 is fitted. This makes it possible to change a necessary part, for example, the material of the internal gear 29 and to perform heat treatment.

FIG. 3 is a schematic longitudinal sectional view showing a schematic structure of a planetary gear type hydraulic motor 40 with a reduction gear according to the second embodiment of the present invention. In FIG. 3, the same components as those of FIG. The same reference numerals are assigned and detailed description is omitted.
The planetary gear type hydraulic motor 40 with a reduction gear according to the second embodiment is characterized in that internal gears 41 and 42 that mesh with the planetary gears 27 and 35 are provided individually.
As a result, the specifications (modules, etc.) of the individual gears of the planetary gears 27 and 35 can be appropriately changed.

  According to the present invention, by adopting such a structure, when the life of the gear is reached, it is possible to deal with it by replacing parts, and maintenance management becomes easy.

1 is a schematic longitudinal sectional view of a planetary gear type hydraulic motor with a reduction gear according to a first embodiment of the present invention. It is sectional drawing along the II-II line of FIG. It is a schematic longitudinal cross-sectional view of the planetary gear type hydraulic motor with a reduction gear according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 40 Hydraulic motor with planetary gear type reduction gear 11 Hydraulic motor 12 Planetary gear mechanism 13 Reduction gear 16 Reduction gear chamber 23 Hydraulic motor chamber 25, 33 Sun gear 26, 34, 37 Spline 27, 35 Planetary gear 28 Main body 29, 41 42 Internal gear 31 Carrier

Claims (1)

In a hydraulic motor with a planetary gear type reduction gear that combines an axial piston type hydraulic motor and a planetary gear type reduction gear,
A spline portion formed on the inner peripheral surface of the main body,
An internal gear fitted into the spline and fitted in the main body;
A planetary gear type hydraulic motor with a reduction gear.

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