JP2605037Y2 - Planetary roller type power transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary roller type power transmission, and more particularly, to an oil bath lubrication type planetary roller type power transmission.

[0002]

2. Description of the Related Art In a conventional planetary roller type power transmission device, grease and lubricating oil are sealed so as to be in contact with the planetary roller, and an oil film of grease and lubricating oil is formed on a transfer surface of the planetary roller. Has been done.

[0003]

In the grease lubrication system using grease, although the sealing structure is simple, during operation, the grease is pushed out to both axial sides of the transfer surface of the planetary roller by the movement of the planetary roller. Oil is likely to occur on the transfer surface,
Lubrication capacity tends to be insufficient. On the other hand, an oil bath lubrication system using a lubricating oil is superior to a grease lubrication system in that the lubricating ability is high, but the sealing structure of the lubricating oil is complicated.

As disclosed in Japanese Utility Model Laid-Open Publication No. 1-82356, the applicant of the present application has disclosed a technique in which grease extruded from a transfer surface of a planetary roller is collected near the transfer surface in a grease lubrication system. is suggesting.
However, this technology does not employ a structure in which grease is actively supplied to the transfer surface of the planetary roller, and is therefore insufficient to stably form an oil film on the transfer surface without breaking the oil film. It was something.

[0005] The present invention has been made in view of such inconvenience, and while simplifying the lubricating oil sealing structure,
It is an object of the present invention to provide a planetary roller type power transmission device configured to stably form an oil film on a transfer surface of a planetary roller.

[0006]

SUMMARY OF THE INVENTION A planetary roller type power transmission device according to the present invention is provided with a fixed wheel, a sun shaft inserted concentrically with the fixed wheel, and interposed therebetween in a press-contact state. A plurality of cylindrical planetary rollers, a carrier shaft that rotatably supports each planetary roller, and a direct contact with any one of the fixed wheel, the sun shaft and the planetary roller after being disposed between the adjacent planetary rollers. And an oil-impregnated member in the form of a roller. These oil-impregnated members are rotatably provided at the same intervals as the planetary rollers.

According to the above construction, the oil-impregnated member rotates around the sun axis in accordance with the revolving operation of the planetary roller, and the fixed wheel, the sun shaft and the planetary roller which are in direct contact with the oil-impregnated member. The lubricating oil contained in the oil-impregnated member adheres to either of the above. That is, when the oil-impregnated member is in contact with the planetary rollers, the lubricating oil is directly supplied to the planetary rollers, and when the oil-impregnated member is in contact with the fixed wheel or the sun shaft, these oils are fixed. Lubricating oil is indirectly supplied to the planetary rollers through the wheel and the sun shaft.

[0008] Then, oil-impregnated member roller shape in this case, specifically, rotatable What cylindrical or columnar shape der
Because is a, not only requires less rotational load acting on the planetary roller, will be the total outer peripheral surface of the oil-impregnated member and uneven wear is suppressed as a result the contact surface, longer life Can be realized. Further, since these oil-impregnated members are provided at the same intervals as the planetary rollers, the oil-impregnated members can be incorporated into the power transmission device as one unit, and the assemblability can be improved. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a configuration of a planetary roller type power transmitting device according to the present embodiment, FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view showing a configuration of a modified example of the planetary roller type power transmission device, and FIG. 4 is a sectional view taken along line (4)-(4) in FIG.

As shown in FIG. 1, a planetary roller type power transmission device according to the present embodiment
And a plurality of shafts (3 in the figure) interposed in a press-contact state between the fixed wheel 1 and the sun shaft 2.
), A planetary roller 3 having a cylindrical shape, a carrier shaft 4 for rotatably supporting each planetary roller 3, and the carrier shaft 4
Are arranged between the adjacent planetary rollers 3 while being rotatably supported, and are in direct contact with the transfer surface of each planetary roller 3 (the same number as the number of the planetary rollers 3), specifically, Are provided with cylindrical oil-impregnated members 5,. These oil-impregnated members 5,.
It is provided for each of the same equally spaced positions.

At this time, the carrier shaft 4 is arranged coaxially with the sun shaft 2, and a disc-shaped flange 6 extending radially outward is integrally formed at an end of the carrier shaft 4. I have. Further, a first support shaft 7 and a second support shaft 8 are provided upright at cantilever positions at circumferentially equally spaced positions on the flange 6, that is, at three locations.
The planetary roller 3 is supported on the support shaft 7, and the oil-impregnated member 5 is supported on the second support shaft 8, for example, via a rolling bearing (not shown) called a cage and roller. Supported as state.

On the other hand, each of the cylindrical oil-impregnated members 5,... Is made by using a porous material such as a foamable resin such as polyethylene, and has numerous holes existing therein. Is pre-impregnated with a lubricating oil such as methyl silicon. The diameters of these oil-impregnated members 5,... Are smaller than the diameters of the planetary rollers 3,. Contact surface. In addition, since each oil-impregnated member 5 has a cylindrical shape, it is needless to say that the oil-impregnated amount, that is, the retained amount of the lubricating oil can be easily adjusted after adjusting its thickness.

Therefore, in the power transmission device according to the present embodiment, the speed reducer, that is, the sun shaft 2 is the input side,
When the carrier shaft 4 is used as a reduction device having an output side, the planetary rollers 3 and 3
Are revolved while rotating, and the carrier shaft 4 is rotated at a rotation speed corresponding to the number of revolutions. In this case, since the oil-impregnated members 5,... Are rotated and revolved by the planetary rollers 3,. , And an oil film is formed on the transfer surfaces of the planetary rollers 3,.

In the present embodiment, the oil-impregnated members 5,.
Are brought into contact with the planetary rollers 3 to supply lubricating oil directly to the transfer surface of each planetary roller 3, but the present invention is not limited to such a configuration. Although not shown, each of the oil-impregnated members 5,... Is either one of the raceway surface of the fixed wheel 1 and the raceway surface of the sun shaft 2, or the fixed wheel 1, the sun shaft 2 and the planetary roller 3 ,... May be brought into contact with each other, and when the oil-impregnated members 5,. .. Are supplied indirectly to the planetary rollers 3,.

By the way, the planetary roller type power transmission device of the present invention has a configuration according to the above-described embodiment, that is,
The configuration described with reference to FIGS. 1 and 2 is not limited to the configuration described above, and it is a matter of course that the configuration may be modified as shown in FIGS. 3 and 4. That is, in the power transmission device of this modified example, four planetary rollers 3,... Are used, and the planetary rollers 3,... Each of the four oil-impregnated members 5,... Arranged in contact with both the transfer surface of the planetary roller 3 and the inner peripheral surface of the fixed wheel 1.

At this time, the oil-impregnated members 5,... Are provided at the same intervals as the planetary rollers 3, but are not supported by the flange 6. . Therefore, these oil-impregnated members 5,
Are supported in the axial direction by being sandwiched between the flange 6 and the cover 9 which are opposed to each other. Here, the number of the planetary rollers 3,... And the oil-impregnated members 5,... Is four, but the number is not necessarily four, and may be three. .

[0018]

As described above, according to the planetary roller type power transmission device of the present invention, the oil impregnating member is positively brought into contact with any one of the fixed wheel, the sun shaft and the planetary rollers. Therefore, the oil film can be stably formed without causing any oil film breakage on the transfer surface of the planetary roller, while simplifying the lubricating oil sealing structure.

[0019] In the present invention, oil-containing member is roller-shaped, specifically, the rotation allowed me cylindrical or columnar shape der
Because is the ability, it becomes that fewer rotational load acting on the planetary roller, will be the total outer peripheral surface of the oil-impregnated member and uneven wear is suppressed as a result the contact surface, A longer life can be realized. Further, since these oil-impregnated members are provided at the same intervals as the planetary rollers, by incorporating the oil-impregnated members as one unit into the power transmission device, simultaneous positioning with other members is possible, and assembly is possible. It is also possible to improve the performance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a planetary roller type power transmission device according to the present embodiment.

FIG. 2 is a sectional view taken along the line (2)-(2) in FIG.

FIG. 3 is a longitudinal sectional view showing a configuration of a modified example of the planetary roller type power transmission device.

FIG. 4 is a sectional view taken along the line (4)-(4) in FIG.

[Explanation of symbols]

 Reference Signs List 1 fixed wheel 2 sun shaft 3 planetary roller 4 carrier shaft 5 oil-impregnated member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-258555 (JP, A) JP-A-1-307566 (JP, A) JP-A-63-203952 (JP, A) JP-A-49-49 135074 (JP, A) Actually open 1979-31183 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 13/08 F16H 57/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed wheel, a sun shaft inserted concentrically through the fixed wheel, a plurality of cylindrical planetary rollers interposed therebetween in a press-contact state, and rotatably supporting each planetary roller. And a roller-shaped oil-impregnated member disposed between adjacent planetary rollers and directly in contact with one of the fixed ring, the sun shaft and the planetary rollers. The planetary roller type power transmission device is provided so as to be rotatable at the same intervals as the planetary roller.