JPS6217447A - Planetary gear - Google Patents

Abstract

PURPOSE:To make the bearing face pressure of a bearing uniform and prevent the damage of said bearing by providing a single bearing in a gear chamber while providing a ring gear having flexibility which restrains the rotation of an internal gear. CONSTITUTION:In a gear chamber B, a partition wall which partitions its input side is formed by an input side cover member 16 and a partition wall which partitions its output side is formed by an upper wheel chamber 17 and a lower wheel chamber 18. Also, in the gear chamber B, a single bearing 21 is provided between the upper wheel chamber 17 and the lower wheel chamber 18 and supports an output shaft 15. And, a planetary gear mechanism consisting of a sun gear 22 provided on the input shaft 14, planetary gears 24 supported by a carrier 25 provided on the output shaft 15, and an internal gear 23 the rotation of which is restrained by a ring gear 27, are housed in the gear chamber B to transmit rotation from the input shaft 14 to the output shaft 15. The ring gear 27 is formed to have flexibility.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a planetary gear device, and in particular, it makes it possible to provide a single bearing in a gear chamber to have a cantilevered structure, and to reduce the bearing surface pressure of the bearing. The present invention relates to a planetary gear device capable of equalizing the reaction force of the driving force and transmitting the reaction force to the output shaft side.

[Prior Art] Generally, a planetary gear device as shown in FIG. 2 is employed for small to medium output power.

As shown in the figure, an input shaft 1 and an output shaft 2 are coaxially inserted into a gear chamber A. gear! Disc-shaped frames 4a and 4b are attached to the input shaft 1 in A through a joint 3.
is supported by the input side cover member 5 that partitions the input side of the gear chamber A.

A sun gear 6 is provided between the frames 4a and 4b, forming one end of the input shaft 1, and is meshed with the outer periphery of the sun gear 6 to rotate the inner periphery of an internal gear 7. A planetary gear 9 is provided.

The planetary gear 9 is fitted onto a planetary gear shaft 10 whose both ends are supported by the frames 4a and 4b.

Further, the rotation of the internal gear 7 is restricted by the ring gear 11. The ring gear 11 has its tip meshed with the outer circumferential part of the internal gear 7,
is supported by the input side cover member 5.

[Problems to be Solved by the Invention] However, in this conventional planetary gear device, the input shaft 1 and the output shaft 2 are each supported by a planetary frame side bearing 12 and an output shaft side bearing 13, respectively. had been adopted.

Therefore, when the output shaft 2 in the gear chamber A undergoes radial axial displacement due to external thermal expansion on the output shaft side of this device, the axial displacement causes the free frame side bearing 12 and the output shaft side bearing to There is a problem in that the load applied to the bearings 12 and 13 becomes unbalanced, or the contact surfaces become lopsided, resulting in damage to these bearings 12 and 13.

[Object of the Invention] The present invention was devised to effectively solve the problems in conventional planetary gear devices.

The purpose of the present invention is to prevent damage to the bearing by equalizing the bearing surface pressure of the bearing, and to reduce the weight of the device by transmitting the reaction force of the driving force to the output shaft side, thereby facilitating maintenance and inspection work. The object of the present invention is to provide a Y11 gearing device that can achieve the above goals.

[Summary of the Invention] In order to achieve the above object, the present invention includes an input shaft and an output shaft coaxially inserted into a gear chamber, and a planetary gear between a sun gear on the input shaft side and an internal gear covering the sun gear. In a planetary gear device that transmits the rotational force of an input shaft to an output shaft via a gear, a single bearing for pivotally supporting the output shaft is provided on a partition wall that partitions the gear seedlings, and a single bearing for pivotally supporting the output shaft is provided. In order to regulate rotation, a flexible ring gear is provided on the partition wall on the output shaft side, the tip of which extends to cover the outer periphery of the internal gear. The ring gear and single bearing are used to equalize the bearing surface pressure applied to the bearing and to transmit the reaction force of the driving force to the partition wall on the output shaft side.

[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, an input shaft 14 located on the input side and an output shaft 15 located on the output side are coaxially inserted into a gear chamber B.

This gear '1B has a partition wall that partitions its input side formed by an input side cover member 16, and a partition wall that partitions its output side formed by a dismounting chamber 17 and a dismounting chamber 18. Further, the upper half of the gear chamber B is partitioned by the upper half cover member 19, and the lower half thereof is divided by the lower half cover member 2o.
It is divided by.

Further, a single bearing 21 is provided on the gear IB.

The bearing 21 is provided between the alighting chamber 17 and the alighting chamber 18 to pivotally support the output shaft 15.

In the gear chamber B thus formed, various gears are provided for transmitting rotational force from the input shaft 14 inserted therein to the output shaft 15.

A thick RAM wheel 22 is provided coaxially with one end of the input shaft 14, and an internal tooth #123 is provided so as to cover the sun tooth 1122.

A planetary gear 24 is provided between the sun gear 22 and the internal gear 23 in mesh with them. The T1 star gear 24 is rotatably fitted onto a planetary gear shaft 26 supported at one end by a frame (carrier) 25 provided at one end of the output shaft 15. That is, the planetary gear 24 revolves around the outer periphery of the sun gear 22 while rotating.

Further, the rotation of the internal gear 23 is restricted by a ring gear 27.

In particular, the base end of this ring tooth lI27 is the gear WB.
It is supported by the dismounting chamber 17 and the dismounting chamber 18 that define the output side of the dismounting chamber 17 and the dismounting chamber 18, and is formed so as to extend from the dismounting chamber 17 and the dismounting chamber 18 so that the distal end portion thereof covers and meshes with the outer peripheral portion of the internal gear 23. Further, the ring gear 27 is formed into a thin cylindrical shape so as to have flexibility.

By configuring as above, the output shaft 1 outside the gear chamber B
5, if the axis is displaced in the radial direction, it is a gear! i! The single bearing 21 provided at B and the flexible ring gear 27 can prevent the bearing 21 from being damaged.

That is, the single bearing 21 forms the output shaft 15 in a cantilevered structure, and the ring gear 27 absorbs and relieves the force due to the axial displacement acting on the internal gear 23, thereby reducing the bearing surface of the bearing 21. It can equalize the pressure.

Further, a reaction force of the driving power is generated in the internal teeth 123, but this reaction force is transmitted to the disembarking chamber 17 via the ring gear 27.
This is transmitted to the alighting seedling 18, and the device is finally installed on the bottom surface of the alighting compartment. Therefore, the cover member 1 excluding the alighting v17 and the alighting compartment 18
6, 19.20, the reaction force of the driving power is not transmitted to this, and as a result, the cover member 16.19.20
can be made into a thinner structure to reduce weight.

In addition, an input side cover member 1 that partitions the input side of the gear chamber B
6, the sun gear 22. Planetary gear 24. The internal gear 23 can be removed, the number of assembly steps can be significantly reduced, and maintenance and inspection work for the device can be facilitated.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since a single bearing is provided in the gear chamber and a flexible ring gear is provided to restrict the rotation of the internal gear, the bearing surface pressure of the bearing can be equalized, preventing damage to the bearing. can be prevented.

:2] By preventing the reaction force of the driving power from being transmitted to the cover members that partition the teeth, each cover member can have a thin wall structure, and weight reduction can be achieved.

(3) By simply removing the cover member that partitions the input side of the gear chamber, components such as gears in the gear chamber can be removed individually, facilitating maintenance and inspection.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a planetary gear cover according to the present invention, and FIG. 2 is a side sectional view showing a conventional planetary gear III device. In the figure, 14 is an input shaft, 15 is an output shaft, 21 is a bearing, 22
is a sun gear, 23 is an internal gear, 24 is a planetary gear, and 27 is a ring gear. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative patent attorney: Nobuo Kinutani 24...Planet, gear 27...S〕Z) Hi Taku

Claims (1)

[Claims] The input shaft and output shaft are coaxially inserted into the gear chamber, and the input shaft transmits the rotational force of the input shaft to the output shaft via the planetary gear between the sun gear on the input shaft side and the internal gear that covers it. In the gear device, a single bearing for pivotally supporting the output shaft is provided on a partition wall that partitions the gear chamber, and a single bearing is provided at the partition wall on the output shaft side to restrict rotation of the internal gear. 1. A planetary gear device characterized in that a flexible ring gear is provided on an outer peripheral portion of an internal gear so as to cover the outer peripheral portion of the internal gear.