JPS6024341B2 - Friction roller transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises: a first shaft and a second ball arranged on the same scale line; an annular casing mounted on the two wheels;
An annular body having the same relationship with the above-mentioned two shafts and fixed immovably relative to the annular casing, and a group of planetary rollers arranged in an annular space between the above-mentioned two axes and the annular body. The present invention relates to a friction roller transmission device that can be used as a transmission, an insert device, or the like.

The present invention will be explained below with reference to the accompanying drawings. 1 and 2 show a friction loaf transmission according to an embodiment of the invention.

That is, this friction loaf transmission has a first shaft 1 having an outer peripheral surface with a perfect circular cross-sectional shape, and is arranged on the same axis in close proximity to the first shaft 1, and has a diameter smaller than that of the first shaft 1. Roller transfer section 2 that is large and has an outer circumferential surface with a perfect circular cross-sectional shape
a, an annular casing 3 mounted on both the shafts 1 and 2, and an inner peripheral surface that is concentric with the wheels 1 and 2 and has a perfect circular cross-sectional shape. an annular body 4 fixed immovably relative to the annular casing 3; and a planetary roller group 6 arranged in an annular space 5 between the two wheels 1 and 2 and the annular body 4. It is equipped with Further, the planetary row group 6 is composed of a large number of rollers that are in frictional contact with each other in a rollable manner, and these rollers are made up of a plurality of rollers that are in rollable and frictional contact with the inner circumferential surface 4 of the annular body 4. an outer roller 6a, a plurality of inner rollers 6b that are in transferably frictional contact with the outer circumferential surface of the first ball 1, and a plurality of intermediate rollers that are transferably and frictionally contacted with the outer circumferential surface of the roller transfer portion 2a of the second shaft 2. roller 6c. The large number of rollers constituting the planetary roller group 6 are arranged so that each inner roller 6b is in frictional contact with two intermediate rollers 6c, and each intermediate roller 6c is in frictional contact with two outer rollers 6a.

Therefore, each loaf constituting the planetary roller group 6 is all supported at three points and incorporated into the transmission device in a stable state. That is, for example, when looking at one inner loaf 6b, this roller 6b is in frictional contact with the first shaft 1 and the two intermediate rollers 6c at three points, and is supported at three points by these; All the rollers making up the planetary roller group are supported at three points. Such a stable arrangement allows the friction roller transmission to operate smoothly and improve its accuracy. In addition, the first
In the figure, 7a, 7b, 7c, and 7d indicate bearings. The annular body 4 is compressed radially inward to properly hold the planetary roller group 6 within the annular space 5, so that each roller does not slip when the friction roller transmission is operated. An external force P is applied to make the transfer possible.

The external force P is applied when the casing 3 is framed after the shafts 1, 2, the planetary roller group 6, the annular body 4, etc. have been assembled. That is, in the illustrated embodiment, the outer peripheral surface of the annular body 4 is
2 extending radially inward from the middle part in the bag line direction to both sides of the bag line direction.
On the other hand, the annular casing 3 is composed of two annular casing parts 3a and 3b having inner side slopes 3a' and 3b' that engage with the respective slopes 4b and 4c. ing. The annular casing parts 3a and 3b are connected together by applying an axial force using bolts 8a, 8b, etc. to bring them closer to each other. When the slopes 4b and 4c of the annular body 4 and the inner wall slopes 3a' and 3b' of each annular casing part
This engagement generates a force that compresses the annular body 4 radially inward, that is, the external force P described above. Further, due to the engagement between the inclined surfaces 4b and 4c and the inner wall slopes 3a' and 3b', the annular body 4 and the casing 3 are reliably fixed so that they do not move relative to each other. Next, a plurality of outer rollers 6a
are arranged so as to be spaced apart from each other in the circumferential direction of the annular space 5, and the same is true for each inner roller 6b and valley intermediate roller 6c.

Therefore, these rollers 6a, 6b, and 6c are in a relative relationship such that all the rollers can shift when the friction roller transmission is operated, that is, when a rotational input is applied to the first shaft 1, for example. They are arranged so that they are in frictional contact with each other. In addition, 4d and 4d' in FIG. 1 indicate that when the loaf is skewed, that is, when the friction roller transmission device is operated, the enemy line of each roller is kept parallel to the marquee line of the first shaft 1 and the second shaft 2. In order to avoid the phenomenon of not sagging or tilting with respect to the axis of the latter, the annular body 4 is formed at both left and right ends (Fig. 1).
The annular protrusion is shown extending radially inward. As shown in FIG. 2, one of the annular protrusions 4d'1 is inserted between the shafts 1, 2 and the annular body 4 before attaching the casing 3 during assembly of the friction roller transmission. A notch 4d'' for inserting each roller into the space 5 is formed.
The friction roller transmission device according to the embodiment of the present invention has the configuration described above, and as shown in FIG. 6b
, each intermediate roller 6c and each outer roller 6a rotate counterclockwise, clockwise, and anti-Japanese clockwise, respectively, and each roller 6a, 6b, and 6c integrally rotates on both shafts 1.
, 2 with the number of revolutions n7.

Further, at this time, the second shaft 2 rotates counterclockwise at a wide rotation speed, while the annular body 4 and the casing 3 rotate counterclockwise at a wide rotation speed. The functions of the rotational speed n to ratio and the revolution number n7 can be easily derived by applying the theory of a well-known planetary gear device including a sun gear, a planetary gear, an internal gear, and the like. Each of the above rotation speeds n. Among the relationships between n6 and revolution number 7, especially the first
The relationship between the rotational speed n of the second shaft 1, the rotational speed ratio of the second shaft 2, and the rotational speed of the annular body 4 and the annular casing 3 is expressed by the following equation. Monkey ten. Saki 11 ----
-(1)n1=. - Dragon n60 B・n5 1-ear; However, the above formula [1} was obtained assuming that sufficient external force P is applied to the annular body 4 and that no slipping occurs while each roller is transferred, and S , indicates the outer diameter of the loaf transfer portion 2a of the second shaft 2, S2 indicates the inner diameter of the annular body 4, and S3 indicates the outer diameter of the first shaft 1.

As is clear from the above formula {1}, the first shaft 1, the second shaft 2, and the annular casing 3 have a constant value regardless of the outer diameter, rotation speed, revolution speed, etc. of each roller forming the planetary roller group 6. Perform rotational motion in relation.

Furthermore, by appropriately selecting the values of S to S3, it is possible to set the relationship among the rotational speeds n, n, and n6 to a desired value. As explained above, in the friction roller transmission device of the present invention, the three members, the first shaft 1, the second shaft 2, and the annular casing 3, rotate in a predetermined relationship.

Therefore, by applying rotational input to some of these members and extracting rotational output from the other members, the transmission device can be used as a transmission, a differential device, or the like. That is, for example, FIGS. 1 to 3
Fixing the annular casing in the transmission shown in the figure,
(That is, in the above equation [...where n5=0]) the first axis 1
If an input rotational speed n is given to the input rotational speed n, a larger output rotational speed n6 can be extracted from the second shaft 2. However, in this case, the transmission device is a speed increasing device. Furthermore, it is clear that if the annular casing 3 is fixed and the input rotational speed is applied to the second shaft 2, and the output rotational speed is taken out from the first shaft 1, the above-mentioned transmission device becomes a reduction gear device. . In addition, the annular casing 3
When fixed and = 0, 1 is the rotational speed of the second shaft 2 ~
The fact that the rotational speed n of the first gear 1 becomes larger can be easily understood by applying the relationship between S and S3 in the transmission devices shown in Figs. 1 to 3 to the above equation 0. It is. In this way, by fixing one of the three members described above and using the other two members as the input member and the output member, respectively, the friction roller transmission device of the present invention can be used as a transmission. I can do it. Furthermore, the friction roller transmission device of the present invention can also become a differential device by applying rotational input to two of the three materials and extracting rotational output from the other material. it is obvious. The friction roller transmission device of the present invention can be used for various purposes as described above, and has the advantage that it can operate smoothly because each roller forming the planetary rollers plays the role of a bearing during operation.

In addition, this transmission device does not use gears, but the rollers forming the planetary roller group 6 are brought into frictional contact with each other so as to be transferable, and the outer roller 6a and the intermediate roller 6
c and the inner roller 6b, respectively, on the inner circumferential surface 4a of the annular body 4.
, is configured so that rotation can be transmitted by contacting the outer circumferential surface of the roller rolling portion 2a of the second shaft 2 and the outer circumferential surface of the first shaft 1 in a transferable manner after friction. Therefore, there are inherent drawbacks in devices that use gears to transmit rotation, namely backlash that causes backlash during operation;
Also, there are no drawbacks such as uneven rotation due to tooth profile, etc. Furthermore, even when the diameter of each roller constituting the planetary loaf group is made small to make the entire transmission device compact, it has the advantage of being able to operate well, and is very effective.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a friction roller transmission according to an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory side view showing the arrangement of the shaft, the planetary roller group, and the annular body, and FIG. 3 is a diagram illustrating the operation of the transmission device. 0 1...First axis, 2...Second axis,
3... Annular casing, 4... Annular body, 5... Annular space, 6... Planetary roller group, 6a... Outer roller, 6b ...Inner roller, 6c...Middle loaf. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A first shaft having an outer peripheral surface with a perfect circular cross-sectional shape;
a second shaft that is arranged close to and on the same axis as the first shaft and includes a roller rolling portion having an outer circumferential surface having a diameter larger than that of the first shaft and a perfect circular cross-sectional shape; an annular casing mounted on both axes, and an annular casing that is concentric with the two axes, has an inner circumferential surface with a perfect circular cross-sectional shape, and is fixed immovably relative to the annular casing. and a planetary roller group arranged in an annular space between the two shafts and the annular body, the planetary roller group being composed of a large number of rollers that are in frictional contact with each other in a rolling manner, These rollers include a plurality of outer rollers that are in rollable and frictional contact with the inner peripheral surface of the annular body, a plurality of inner rollers that are in rollable and frictional contact with the outer peripheral surface of the first shaft, and a plurality of inner rollers that are in rollable and frictional contact with the outer peripheral surface of the first shaft. It includes a plurality of intermediate rollers that rollably come into frictional contact with the outer circumferential surface of the roller rolling section, and each of the many rollers constituting the planetary roller group is in frictional contact with two intermediate rollers. and each intermediate roller is arranged in frictional contact with two outer rollers. 2. The friction roller transmission device according to claim 1, wherein the outer circumferential surface of the annular body has two slopes extending radially inward from an axially intermediate portion of the annular body toward both sides thereof. In addition, the annular casing is composed of two annular casing parts, each having an inner wall slope that engages with each of the slopes, and which are connected together by bolting or the like, and the connection When an axial force is applied to the two casing parts, the engagement between the two slopes of the annular body and the slopes of the inner walls of each casing produces a force that compresses the annular body radially inward. A friction roller transmission device characterized in that it is configured to cause a friction roller transmission to occur.