JP2015148261A - planetary roller transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planetary roller transmission capable of eliminating the occurrence of a backlash.SOLUTION: A planetary roller transmission 1 of the present invention comprises: a sun roller 10; a plurality of first planetary rollers 11a and 11b arranged adjacent to and around the sun roller 10 for revolving while auto-rotating; a plurality of second planetary rollers 12 arranged around the outer circumferences of the revolution tracks of the first planetary rollers 11a and 11b thereby to form a revolution track concentric to the sun roller 10 and arranged adjacent to abut against the outer circumferences of the first planetary rollers 11a and 11b; and a stationary ring 13 arranged adjacent to the second planetary roller 12 and enveloping while pressing the second planetary rollers 12 individually.

Description

  The present invention relates to a planetary roller transmission.

  For example, as disclosed in Patent Document 1, the planetary roller transmission includes a sun roller, a plurality of planetary rollers that revolve around the sun roller while revolving around the sun roller, and the revolution of the planetary roller. A fixed ring arranged so as to be concentric with the sun roller on the outer periphery of the orbit and a carrier for taking planetary roller revolution motion concentric with the sun roller as input or taking out as output.

JP 2011-102624 A

  In the planetary roller transmission as described above, even if the planetary roller revolves, there is a fitting clearance between the rotating shaft hole of the planetary roller and the shaft that passes through the hole, so that the shaft is not covered by the fitting clearance. While moving inside, the inner periphery of the planetary roller rotation center shaft hole and the outer periphery of the shaft of the carrier are not in contact with each other, and no motion is transmitted. As a result, backlash occurs in the planetary roller transmission.

  The present invention has been made under such a background, and an object thereof is to provide a planetary roller transmission that can eliminate the occurrence of backlash.

  The present invention is a sun roller, a plurality of first planetary rollers that are arranged adjacent to the periphery of the sun roller and revolve while rotating, and a revolution orbit that is concentric with the sun roller on the outer periphery of the revolution orbit of the first planetary roller. A plurality of second planetary rollers arranged adjacent to each other so as to contact the outer peripheral surface of the first planetary roller, and a fixing ring arranged adjacent to the second planetary roller and pressing and enclosing each of the second planetary rollers And a planetary roller transmission.

  For example, the outer periphery of two adjacent first planetary rollers may be in contact with one second planetary roller, or two second planetary rollers may be applied to each first planetary roller. You may make it contact.

  Furthermore, the carrier which is a concentric shaft with the sun roller which takes out the rotation rotational motion of the planetary roller of the side which has one mutual contact point as an output between the first planetary roller and the second planetary roller can be provided.

  According to the present invention, the occurrence of backlash in the planetary roller transmission can be eliminated.

It is a figure which shows the structure of the planetary roller transmission which concerns on 1st embodiment of this invention. It is a figure which expands and shows the structure of the sun roller of FIG. 1, a 1st planetary roller, a 2nd planetary roller, and a fixing ring. It is a figure which shows the structure of the conventional planetary roller transmission as a comparative example. It is a figure which shows the structure of the planetary roller transmission which concerns on 2nd embodiment of this invention.

  A planetary roller transmission 1 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the planetary roller transmission 1 includes a sun roller 10, first planetary rollers 11a and 11b, a second planetary roller 12, a fixed ring 13, a rotating shaft 14, and a carrier C. The rotating shaft 14 is integrally fixed to the carrier C.

  When the sun roller 10 rotates counterclockwise as indicated by an arrow in FIG. 1, the carrier C to which the rotating shaft 14 is integrally fixed rotates clockwise as indicated by an arrow. Further, when the sun roller 10 rotates clockwise, the carrier C rotates counterclockwise.

  Below, operation | movement of the planetary roller transmission 1 is demonstrated in detail. In the following description, the case where the fixing ring 13 is fixed using the sun roller 10 as an input shaft will be described. According to this, the output appears as the rotation of the carrier C. That is, the input rotation of the sun roller 10 is shifted and output as the rotation of the carrier C.

  When the sun roller 10 as the input shaft rotates, the rotation is transmitted to the first planetary rollers 11a and 11b. Further, the rotation of the first planetary rollers 11 a and 11 b is transmitted to the second planetary roller 12. Since the second roller 12 is sandwiched between the two first rollers 11a and 11b and the fixing ring 13, the first planetary rollers 11a and 11b and the second planetary roller 12 are both fixed to the sun roller 10. Revolving while rotating between the rings 13, the carrier C to which the rotary shaft 14 is integrally fixed rotates via the rotary shaft 14 fitted in the rotation center holes of the first planetary rollers 11 a and 11 b.

  At this time, as shown in FIG. 2, there is a fitting gap G between the first planetary rollers 11a and 11b and the rotating shaft 14, but the first planetary rollers 11a and 11b are forced to move away from each other. In order to receive F1a and F1b, each is pressed against the rotating shaft 14. Accordingly, the fitting gap G is at a predetermined position on the inner circumference of the first planetary rollers 11a and 11b, and the position does not move and the gap does not increase or decrease.

  That is, on the first planetary rollers 11a and 11b sandwiched between the sun roller 10 and the second planetary roller 12, forces F2a and F2b that the first planetary rollers 11a and 11b press the sun roller 10 are acting. Further, forces F3a and F3b act on the first rollers 11a and 11b as reaction forces of the forces F2a and F2b. Furthermore, forces F4a and F4b are applied so that the second roller 12 presses the first rollers 11a and 11b, respectively. Moreover, the force F5 which the 2nd planetary roller 12 presses the fixing ring 13 is acting, and the reaction force of the force F5 is divided | segmented into force F4a and F4b, respectively. At this time, the resultant force of the forces F3a and F3b and the forces F4a and F4b becomes the forces F1a and F1b.

  Thereby, even if the first planetary rollers 11a and 11b revolve in the clockwise direction or the counterclockwise direction, the carrier C rotates without causing a transmission delay due to the gap G of the fitting portion. That is, the planetary roller transmission 1 can eliminate backlash accompanying rotation.

  Here, a conventional planetary roller transmission 50 is shown in FIG. 3 as a comparative example. The sun roller 60, a plurality of planetary rollers 61 that revolve around the same orbit while rotating around the sun roller 60, and the outer periphery of the revolution orbit of the planetary roller 61 are arranged to be concentric with the sun roller 60. The fixing ring 62, the rotating shaft 63 of the planetary roller 61, and the rotating shaft 63 are integrally fixed, and the carrier 64 for taking the planetary roller revolving motion concentric with the sun roller 60 as an input or as an output, Have

  In such a conventional planetary roller transmission 50, the fitting gap G between the inner periphery of the planetary roller 61 and the outer periphery of the rotating shaft 63 is changed between forward and reverse rotation of the sun roller 60 and before and after the rotation starts from the stop. Change the position with. For example, when the sun roller 60 is rotating clockwise, the rotating shaft 63 is biased to a position in the counterclockwise direction on the inner periphery of the planetary roller 61. Here, when the sun roller 60 is reversely rotated in the counterclockwise direction, the rotating shaft 63 moves from the position in the counterclockwise direction on the inner periphery of the planetary roller 61 to the position in the clockwise direction in the opposite direction and is biased. . Within the movement time of the rotating shaft 63, the rotation of the sun roller 60 is not transmitted to the planetary roller 61, and backlash occurs.

  On the other hand, in the planetary roller transmission 1, as shown in FIG. 2, the rotation shafts 14 of the first planetary rollers 11a and 11b are always biased to a predetermined position regardless of the rotation direction of the sun roller 10. . Therefore, in the planetary roller transmission 1 as well as the conventional planetary roller transmission 50, the fitting gap G exists, but the fitting gap G does not cause backlash. Thereby, the planetary roller transmission 1 can realize a speed change operation without backlash.

  It should be noted that the fitting clearance is not so different between the large planetary roller transmission and the small planetary roller transmission. Therefore, the fitting gap becomes larger as the size becomes smaller when viewed relatively. Therefore, the smaller the planetary roller transmission 1 according to the present embodiment, the more useful.

  As described above, according to the planetary roller transmission 1, the sun roller 10, the plurality of first planetary rollers 11a and 11b that are arranged adjacent to the periphery of the sun roller 10 and revolve while rotating, the first A plurality of second planetary rollers 12 arranged so as to be concentric with the sun roller 10 on the outer circumference of the orbit of the planetary rollers 11a and 11b and arranged adjacent to the outer circumferential surface of the first planetary rollers 11a and 11b. And the fixing ring 13 that is arranged adjacent to the second planetary roller 12 and presses and encloses each of the second planetary rollers 12, the occurrence of backlash in the planetary roller transmission 1 can be eliminated.

  Thereby, it is not necessary to increase the component manufacturing accuracy in order to reduce backlash, and the manufacturing cost can be reduced. Further, since there is no backlash, there is no transmission delay in forward / reverse rotation and stopping. Furthermore, since the revolution direction of the first planetary rollers 11a and 11b is reverse to the rotation direction of the sun roller 10, the rolling speed of the first planetary rollers 11a and 11b is increased, and the rotation speed of the sun roller 10 is low. However, an oil film on the contact surface is easily generated. Further, as compared with the planetary roller transmission 50 of the comparative example of FIG. 3, the planetary roller transmission 1 according to the present embodiment has two first planetary rollers 11 a and 11 b in contact with one sun roller 10. Further, the pressing force per one first planetary roller 11a or first planetary roller 11b is reduced, and the durability of the first planetary rollers 11a and 11b can be improved.

(Other embodiments)
The above-described embodiment of the present invention can be variously modified without departing from the gist thereof. For example, as in the planetary roller transmission 1a shown in FIG. 4, two second planetary rollers 12a and 12b are provided for one first planetary roller 11c, and the rotation shaft 14a of the second planetary rollers 12a and 12b is provided. It is also possible to have a fixing ring 13a that presses and encloses each of the carrier Ca and the second planetary roller for integrally fixing the two.

  In addition, the inner diameter portions of the first planetary rollers 11a and 11b shown in FIG. 1 have a sliding bearing structure with respect to the rotating shaft 14, but instead of this, a rolling bearing structure may be used as shown in FIG. It can be easily analogized that the backlash due to the internal clearance of the rolling bearing and the fitting clearance of the rolling bearing can be eliminated by the action of the forces F1a and F2a.

  Moreover, although the rotating shaft 14 fixed integrally with the carrier C is fitted in the rotation center shaft hole of the 1st planetary rollers 11a and 11b shown in FIG. 1, without using the rotating shaft 14, what is the carrier C? You may make it hold | maintain the outer peripheral surface of 1st planetary roller 11a, 11b with a carrier of a different shape.

  In the above description, the double planetary roller has been described as an example. However, it is not necessary to limit the planetary roller to double for the purpose of eliminating the occurrence of backlash. In consideration of the size of the transmission, the transmission ratio, the load, etc., a triple or more multiple planetary roller may be used.

DESCRIPTION OF SYMBOLS 1,1a ... Planetary roller transmission, 10 ... Sun roller, 11a, 11b, 11c ... 1st planetary roller, 12, 12a, 12b ... 2nd planetary roller, 13, 13a ... Fixed ring, 14, 14a ... Rotating shaft, C, Ca ... Career

Claims (4)

With sun rollers,
A plurality of first planetary rollers arranged adjacent to the periphery of the sun roller and revolving while rotating;
A plurality of second planetary rollers arranged on the outer circumference of the revolution orbit of the first planetary roller so as to be a revolution orbit of a concentric circle with the sun roller, and arranged adjacent to and in contact with the outer circumferential surface of the first planetary roller;
A fixing ring that is arranged adjacent to the second planetary roller and presses and encloses each of the second planetary rollers;
Having
A planetary roller transmission characterized by that. The planetary roller transmission according to claim 1, wherein
The outer periphery of two adjacent first planetary rollers and one second planetary roller abut,
A planetary roller transmission characterized by that. The planetary roller transmission according to claim 1, wherein
Two second planetary rollers are brought into contact with each first planetary roller,
A planetary roller transmission characterized by that. The planetary roller transmission according to any one of claims 1 to 3,
Between the first planetary roller and the second planetary roller, it has a carrier that is a concentric shaft with the sun roller that takes out the rotational rotation of the planetary roller on the side having one contact point as an output.
A planetary roller transmission characterized by that.

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