JP3835709B2 - Lubrication mechanism of flexibly meshing gear system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication mechanism of a flexure meshing gear device. More specifically, the present invention relates to a lubrication mechanism for efficiently lubricating each friction portion of the apparatus.
[0002]
[Prior art]
In a flexure-meshing gear device, a grease cartridge made of a swongy material is placed inside the flexible external gear, and the grease is impregnated in the device without supplying grease from the outside. There is known a lubrication mechanism that lubricates each part of the above. Such lubrication by the grease cartridge is suitable for the case where the flexure meshing gear device is configured as a unit structure and is fixedly mounted at a desired location on the user side.
[0003]
[Problems to be solved by the invention]
The applicant of the present invention first arranges the first and second end plates at both ends in the apparatus axial direction, and supports the rotary input shaft so as to be rotatably supported between both ends, and bends between them. There has been proposed a unit-type flexibly meshing gear device having a configuration incorporating a rigid internal gear, a flexible external gear, and a wave generator that constitute a meshing gear mechanism. For example, it is disclosed in the specification of Japanese Patent Application No. 7-120957.
[0004]
The flexibly meshing gear device having the structure disclosed in this patent application and the like is small and compact, and in particular, its length (dimension in the device axial direction) can be reduced.
[0005]
Such a unit-type flexibly meshing gear device is installed and fixed at a desired location on the user side. Therefore, it is desirable to lubricate each part in the apparatus using a built-in grease cartridge system. Even if the installation posture is different, it is desirable that each friction part in the apparatus is lubricated efficiently.
[0006]
An object of the present invention is to always sufficiently lubricate the internal lubrication portion by making the internal space of the unit-type flexibly meshing gear device in a liquid-tight state and disposing a grease cartridge at an appropriate position inside the unit space. This is to propose a possible lubrication mechanism.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the flexibly meshing gear device of the present invention, first and second end plates are disposed at both ends in the device axial direction, and a rotation shaft is provided between the end plates at the center thereof. In a unit type in which an annular sealed space is defined by disposing a bearing and a rigid internal gear on the outer peripheral side of the first end that is partitioned by a wave generator. The structure which has arrange | positioned the 1st and 2nd grease cartridge to the board | substrate side and the 2nd end plate side is employ | adopted, respectively.
[0008]
In the present invention, the first grease cartridge arranged on the first end plate side is arranged in the inner space on the inner peripheral side on the input shaft side partitioned by the flexible external gear. A grease cartridge and a fourth grease cartridge disposed in the inner space on the outer peripheral side on the bearing side are provided.
[0009]
Thus, in the flexibly meshing gear device of the present invention, a sealed internal space is defined by the first and second end plates, and the bearings and rigid internal gears arranged on the outer peripheral side between these end plates. Has been. In this internal space, the meshing portion of the rigid internal gear and the flexible external gear, and the friction portion of the wave bearing of the wave generator fitted into the inner peripheral surface of the flexible external gear are sandwiched between the two sides. The first and second grease cartridges are respectively disposed. Therefore, no matter how the mounting posture of the apparatus is switched, these portions are lubricated by both the grease cartridges or the grease cartridge on one side.
[0010]
The first grease cartridge includes third and fourth grease cartridges disposed on the inner peripheral side and the outer peripheral side with the flexible external gear interposed therebetween. Therefore, the third grease cartridge located on the inner peripheral side lubricates the frictional portion between the wave generator and the inner peripheral surface of the flexible external gear, the bearing portion of the input shaft, and the like. Further, the frictional portion and the sliding portion of the bearing are lubricated by the fourth grease cartridge located on the outer peripheral side.
[0011]
Thus, if the lubrication mechanism of this invention is employ | adopted, the lubrication with respect to each part in an apparatus can always be performed appropriately.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A top hat type flexure meshing gear device to which the present invention is applied will be described below with reference to FIG.
[0013]
A top-hat type flexure meshing gear device 1 shown in the figure includes a first end plate 2 and a second end plate 3 arranged at a certain interval in the direction of the device axis 1a. Between the first and second end plates 2 and 3, the input rotation shaft 4 is arranged in the direction of the device axis 1 a. The input rotation shaft 4 protrudes outward through the first end plate 2. In addition, the first end plate 2 is rotatably supported via a ball bearing 5 with respect to the inner peripheral surface 2a. An oil seal 51 for sealing between the first end plate 2 and the input rotary shaft 3 is attached to the outside of the ball bearing 5.
[0014]
Similarly, on the second end plate 3 side, it is rotatably supported via a ball bearing 6 with respect to an inner peripheral surface 3a of a circular groove formed on the inner surface thereof. As described above, the input rotation shaft 4 is supported by the first and second end plates 2 and 3 in a both-end supported state. A high-speed rotating member such as a motor output shaft is connected to the protruding portion 4a of the input rotating shaft 4 that penetrates the first end plate 2 and protrudes outward.
[0015]
Between these first and second end plates 2 and 3, a cross roller bearing 7 is disposed on the outer peripheral side on the first end plate 2 side, and on the second end plate 3 side. A rigid internal gear 11 is arranged. Inside the cross roller bearing 7 and the rigid internal gear 11, a top hat-shaped flexible external gear 12 is arranged.
[0016]
The flexible external gear 12 includes a cylindrical body portion 13, a diaphragm 14 spreading radially outward from an opening end of the body portion 13 on the first end plate 2 side, and the diaphragm 14. An annular boss 15 continuing to the outer peripheral edge of the body portion 13 and external teeth 16 formed on the outer peripheral surface of the opening end of the body portion 13 on the second end plate 3 side are provided.
[0017]
A wave generator 17 is fitted inside the trunk portion 13 where the external teeth 16 of the flexible external gear 12 are formed. The wave generator 17 includes an elliptical rigid cam plate 18 and a wave bearing 19 fitted to the outer peripheral surface. The rigid cam plate 18 is fixed to the outer periphery of the input rotary shaft 4.
[0018]
The outer ring 71 of the cross roller bearing 7 is fastened and fixed to the first end plate 2 by a fastening bolt 21 via an annular boss 15 of a flexible external gear. Therefore, the three members of the first end plate 2, the flexible external gear 12, and the outer ring 71 of the cross roller bearing are fastened. Sealing rings 41 and 42 are attached to the mating surfaces of these three members for sealing.
[0019]
The inner ring 72 of the cross roller bearing 7 is fastened and fixed to the second end plate 3 side by the fastening bolt 22 via the rigid internal gear 11. Therefore, the three members of the second end plate 3, the rigid internal gear 12, and the inner ring 72 of the cross roller bearing are fastened. Sealing rings 43 and 44 are also attached to the mating surfaces of these three members for sealing.
[0020]
Of the mating surfaces of the outer ring 71 and the inner ring 72 of the cross roller bearing 7, the mating surface 74 on the second end plate 3 side is exposed to the outside. The mating surface 74 is sealed with an oil seal 75 attached thereto.
[0021]
Thus, the cross roller bearing 7 enables relative rotation between the first end plate 2 side and the second end plate 3 side. One of these end plates is connected to the driven side, and the other side is fixed so as not to rotate. As a result, the high speed rotation input from the input rotating shaft 4 is greatly decelerated and transmitted to the driven member side by a known deceleration principle.
[0022]
As described above, the device 1 is a unit type in which the annular sealed space 10 is defined by the end plates 2 and 3 on both sides, the cross roller bearing 7 and the rigid internal gear 11. The sealed space 10 is divided by a wave generator 17 into left and right by an internal space 10 a on the first end plate 2 side and an internal space 10 b on the second end plate 3 side. Further, the inner space 10a on the inner peripheral side is partitioned from the inner space 10c on the outer peripheral side by the flexible external gear 12.
[0023]
Here, a portion of the inner surface of the second end plate 3 facing the opening end 13a of the body portion 13 of the flexible external gear has a certain depth toward the device axis 1a. And an annular grease cartridge 82 is mounted therein. That is, the grease cartridge 82 is arranged in the internal space 10b. The grease cartridge 82 is made of, for example, a porous elastic material, and is impregnated and held with grease.
[0024]
Further, in the internal space 10 a, an annular grease cartridge 81 is disposed between the annular bearing receiver 2 b formed on the inner surface of the first end plate 2 and the flexible external gear 12. ing. The grease cartridge 81 can also be formed from the same material as the above-described grease cartridge 82, and the grease is impregnated and held. The grease cartridge 81 is attached and fixed to the first end plate 2 side.
[0025]
Further, in the internal space 10 c, an annular grease cartridge 83 is disposed between the inner peripheral surface of the inner ring 72 of the cross roller bearing 7 and the flexible external gear 12. The grease cartridge 83 is also made of the same material as the grease cartridges 81 and 82, and is fixedly attached to the inner peripheral surface of the inner ring.
[0026]
In the flexure meshing gear device 1 configured as described above, the grease that has flowed out of the grease cartridge 81 lubricates the portion of the wave bearing 19 of the wave generator 17 and also the portion of the input rotary shaft 4 on the ball bearing 5 side. Lubricate. The grease that has flowed out from the grease cartridge 82 lubricates the portion of the wave bearing 19 of the wave generator 17 and also lubricates the meshing portion of the inner teeth 11 a and the outer teeth 16. Further, the ball bearing 6 portion of the input rotating shaft 4 is lubricated. Further, the grease that has flowed out of the grease cartridge 83 lubricates the meshing portion of the inner teeth 11 a and the outer teeth 16 and also lubricates the portion of the cross roller bearing 7.
[0027]
In this way, each lubrication portion inside the apparatus 1 is lubricated by the grease supplied from the three grease cartridges 81, 82, 83. Therefore, lubrication to each sliding part and friction part inside the apparatus is sufficiently performed. Therefore, the wear of these sliding parts can be suppressed as much as possible, and the life of the apparatus can be extended.
[0028]
In the above description, the description has been given by taking as an example a flexure meshing gear device including a top-hat-shaped flexible external gear. However, the lubrication mechanism of the present invention can also be applied to a flexure meshing gear device having a cup-shaped flexible external gear. Similarly, the present invention can be applied to a flexure meshing gear device including a flat-shaped flexible external gear.
[0029]
Further, in the above description, the second end plate 3 side is a sealed end face, but the input rotary shaft 4 may be projected through the second end plate 3. In this way, the input rotary shaft 4 can be easily connected regardless of which side the high-speed rotation source is on. In this case, an oil seal may be attached to the second end plate 3 side. For the input rotation shaft 4, a hollow rotation shaft may be employed.
[0030]
Further, in the above description, the cross roller bearing 7 is employed to enable relative rotation between the first end plate 2 side and the second end plate 3 side. Alternatively, ball bearings may be used.
[0031]
In addition, in the above description, the inner ring of the bearing and the rigid internal gear are configured as separate members, but they may be formed as an integrated object.
[0032]
【The invention's effect】
As described above, the flexibly meshing gear device of the present invention has an annular sealed space by the first and second end plates, the bearing and the rigid internal gear disposed on the outer peripheral side of the space between them. The grease cartridge is arranged at an appropriate position so that each lubrication portion inside the sealed space is sufficiently lubricated.
[0033]
Therefore, according to the present invention, even if the mounting posture of the apparatus is changed, lubrication can be appropriately performed on each lubricating portion inside the apparatus, and the apparatus life can be extended.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a cross-sectional configuration of a top-hat type flexure meshing gear device to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible meshing gear apparatus 2 1st end plate 3 2nd end plate 4 Rotation input shaft 7 Cross-roller bearing 71 Outer ring 72 Inner ring 74 Oil seal 10 Sealed space 10a, 10b, 10c Internal space 11 Stiff internal gear 11a Internal teeth 12 Flexible external gear 13 Flexible external gear body 16 External teeth 17 Wave generator 19 Wave generator wave bearing 19a Wave bearing outer rings 41, 42, 43, 44 Seal ring 51 Oil Seal 81, 82, 83 Grease cartridge

Claims (2)

The first and second end plates disposed at both ends of the device axial line direction, these first and second end plates, bearings and rigidity both on the outer peripheral side when rotatably disposed a rotary shaft at its center In the unit type flexure meshing gear device in which the annular sealed space is partitioned by arranging the internal gear,
First and second grease cartridges are respectively disposed in the internal space on the first end plate side and the internal space on the second end plate side that are partitioned by the wave generator disposed in the sealed space. Has been placed,
The first grease cartridge disposed in the internal space on the first end plate side is partitioned by a flexible external gear disposed in the sealed space, on the inner peripheral side on the rotating shaft side. A third grease cartridge disposed in the space; and a fourth grease cartridge disposed in the outer peripheral space on the bearing side;
A lubrication mechanism for a flexibly meshing gear device, wherein grease is impregnated and held in these grease cartridges. First and second end plates arranged at a certain interval in the apparatus axial direction, and the centers of the first and second end plates extend in the apparatus axial direction. A rotary shaft that is rotatably supported by the end plate, a rigid internal gear disposed between the first and second end plates, and a top hat-shaped flexible gear disposed inside the rigid internal gear. A flexible external gear, a wave generator fitted inside the flexible external gear and fixed to the outer periphery of the rotary shaft, and the first and second end plates. Bearings,
The outer ring of the bearing is fixed to the first end plate and the flexible external gear side, and the inner ring of the bearing is fixed to the second end plate and the rigid internal gear side. ,
The flexible external gear is continuous with a cylindrical body, a diaphragm extending radially outward from the first end plate side of the body, and an outer peripheral edge of the diaphragm. An annular boss, and external teeth formed on the outer peripheral surface of the opening end of the body portion on the second end plate side,
An annular first grease cartridge is disposed on the inner surface of the second end plate facing the opening end of the body portion, and is located between the outer peripheral surface of the body portion and the inner ring of the bearing. An annular second grease cartridge is disposed, and an annular third grease cartridge is disposed between the inner peripheral surface of the body portion on the first end plate side and the rotation shaft. A lubrication mechanism for a flexibly meshing gear device, wherein the first to third grease cartridges are impregnated and held with grease.

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