JP6278234B2 - Planetary roller type transmission - Google Patents

Description

  The present invention relates to a planetary roller transmission.

  Conventionally, planetary roller transmissions are known. The planetary roller type transmission includes an input shaft, an output shaft, a fixed wheel disposed concentrically with the input shaft, a plurality of cylindrical planetary rollers that are in rolling contact with both the input shaft and the fixed wheel, and an output shaft. And a carrier fixed to the. The following Patent Document 1 describes a pair of annular regulating members arranged with a plurality of planetary rollers sandwiched in the axial direction. The pair of regulating members regulate the range of axial movement of each planetary roller.

JP-A-8-93872

When the skew to the planetary roller (inclination of the central axis of the planetary roller with respect to the intended rotation axis) occurs, the planetary roller intermittently contacts the regulating member. Further, the contact strength of the planetary roller with respect to the regulating member also changes according to the position of the planetary roller and the skew angle. Therefore, there is a possibility that the rotational torque of the output shaft is uneven.
Accordingly, an object of the present invention is to provide a planetary roller type transmission that can suppress the rotation unevenness caused by the contact between the planetary roller and the regulating member to be low, and thereby has high rotation accuracy.

  The invention according to claim 1 for achieving the above object includes an input shaft (11), a fixed ring (12) concentrically arranged around the input shaft and the input shaft, and the input shaft. And a plurality of cylindrical planetary rollers (13) in rolling contact with both of the fixed wheels, an output shaft (6), and a carrier fixed to the output shaft and rotatably supporting each of the plurality of planetary rollers. (10) and a pair of annular restricting plates (21, 21) that are elastically deformable and sandwich each of the plurality of planetary rollers in the axial direction (X) and restrict movement of the plurality of planetary rollers in the axial direction 22; 121, 122) and a portion of each annular restricting plate in contact with the planetary roller on the opposite side of the planetary roller via an annular space (31, 32; 131, 132). Regulatory wall that regulates elastic deformation Characterized in that it comprises a 129, 130) and the planetary roller type transmission (5; 29, 30 to provide 105).

In this section, the alphanumeric characters in parentheses represent reference signs of corresponding components in the embodiments described later, but the scope of the claims is not limited to the embodiments by these reference numerals.
If; (W3, W4 W1, W2 ) is the load of skew assumed value in the portion where the planetary rollers are in contact in said annular regulating plate is applied The invention according to claim 2, the axial width of the annular space The planetary roller transmission according to claim 1, wherein the annular restriction plate that is elastically deformed is set to a width that does not contact the restriction wall.

According to a third aspect of the present invention, the axial width (W1, W2; W3, W4) of the annular space is smaller than the deformation amount when the annular restricting plate is deformed until reaching the yield point. The planetary roller transmission according to claim 1 or 2, wherein the planetary roller transmission is set.
According to a fourth aspect of the present invention, an annular portion (161, 162) protruding in a direction intersecting the annular restricting plate is formed at an axial end edge of the annular restricting plate. It is a planetary roller type transmission as described in any one of these.

1 is a diagram showing a schematic configuration of an image forming apparatus equipped with a planetary roller transmission according to an embodiment of the present invention. It is sectional drawing which expands and shows the principal part of the planetary roller type transmission which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which the 1st collar ring elastically deformed in FIG. It is sectional drawing which expands and shows the principal part of the planetary roller type transmission which concerns on other embodiment of this invention. It is sectional drawing which expands and shows the principal part of the planetary roller type transmission which concerns on another form.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing a schematic configuration of a power transmission unit 1 of an image forming apparatus such as a printing machine equipped with a planetary roller transmission 5 according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a main part of the planetary roller transmission 5 according to one embodiment of the present invention.
The power transmission unit 1 of the image forming apparatus includes a driven body 2, a planetary roller transmission unit 3 that rotationally drives the driven body 2, a driven body input shaft 4 of the driven body 2, and a planetary roller transmission 5. And a coupling 7 that couples the output shaft 6 to each other. In the power transmission unit 1, the planetary roller type transmission unit 3 is placed in a lateral state in which the output shaft 6 is horizontal.

The planetary roller type transmission unit 3 includes an electric motor 8, a planetary roller type transmission 5, and a housing 9 that integrally accommodates the electric motor 8 and the planetary roller type transmission 5.
The housing 9 includes a first housing 9A made of, for example, aluminum for housing and holding the electric motor 8, and a second housing 9B made of, for example, aluminum for housing and holding a part of the output shaft 6 and the carrier 10 described below. .

The planetary roller type transmission 5 includes an input shaft 11, a fixed wheel (sun wheel) 12, a plurality (for example, three in this embodiment) of planetary rollers 13, an output shaft 6, a carrier 10, a first Second collar rings (annular restriction plates) 21 and 22.
A motor shaft 8 </ b> A of the electric motor 8 is connected to the input shaft 11. The motor shaft 8A may be provided as an input shaft.

The fixed ring 12 is fixed between the first housing 9A and the second housing 9B in a state of being sandwiched concentrically with the input shaft 11. The fixed ring 12 has an annular shape, and is formed using, for example, bearing steel. The first housing 9 </ b> A, the fixed ring 12, and the second housing 9 </ b> B are fixed by a plurality of bolts 15.
A plurality of planetary rollers 13 are accommodated in the fixed ring 12. The plurality of planetary rollers 13 are arranged at equiangular intervals in an annular space formed between the fixed wheel 12 and the input shaft 11. Each planetary roller 13 is arranged so as to be in rolling contact with both the outer peripheral surface of the input shaft 11 and the inner peripheral surface of the fixed ring 12 in a pressure contact state via a lubricant. Each planetary roller 13 has a cylindrical shape (or an annular shape) and is formed using, for example, bearing steel.

  The carrier 10 has a disk shape. On one side (the right side in FIG. 1) 10A of the carrier 10, cylindrical pins 16 having the same number as the planetary rollers 13 are provided so as to be perpendicular to the one side 10A. In other words, the plurality of planetary rollers 13 protrude from the common carrier 10. As shown in FIG. 1, the pins 16 may be separate parts from the carrier 10 or may be provided integrally with the carrier 10. Each pin 16 is inserted through the corresponding planetary roller 13. Thus, the planetary roller 13 is rotatably supported in a loosely fitted state. The pin 16 has a cylindrical shape, and is formed using, for example, bearing steel.

  A cylindrical bush 17 is interposed between the pair of planetary rollers 13 and the pin 16. The bush 17 has an outer peripheral surface 17A formed of a cylindrical surface, and the thickness thereof is uniform throughout the entire circumferential direction. The bush 17 is made of, for example, resin or ceramic, and is externally fixed to the outer periphery of the pin 16 by an interference fit. A clearance is provided between the inner periphery of each planetary roller 13 and the outer periphery of each bush 17.

The output shaft 6 is fixed to the other surface 10 </ b> C (left surface in FIG. 1) side of the carrier 10. Further, the output shaft 6 is supported by the second housing through one rolling bearing 19 at one position in the middle thereof. Therefore, the output shaft 6 is rotatably provided.
When the rotational driving force from the electric motor 8 is applied to the output shaft 6, each planetary roller 13 rotates in a predetermined rotation direction and revolves in a predetermined revolution direction. As the planetary roller 13 revolves, the carrier 10 rotates (spins). The rotational driving force of the carrier 10 is taken out from the planetary roller type transmission 5 through the output shaft 6, and the driven member 2 of the image forming apparatus is rotationally driven using this rotational driving force.

The first and second collar rings 21 and 22 are arranged so as to sandwich each of the plurality of planetary rollers 13 in the axial direction (the same direction as the axial direction X of the input shaft 11 and the output shaft 6). The movement of the plurality of planetary rollers 13 in the axial direction X is restricted.
The first collar ring 21 is formed by using, for example, a phosphor bronze material and has a ring plate shape. The first collar ring 21 has substantially the same inner diameter as the inner peripheral surface of the first housing 9A. The first collar ring 21 is interposed between the peripheral edge of one end face (left end face in FIG. 2) 9AA of the first housing 9A and the peripheral edge of the other end face (right end face in FIG. 2) of the fixed ring 12. It is disguised. The first collar ring 21 formed using a phosphor bronze material is elastically deformable (has flexibility).

  The second collar ring 22 is formed using, for example, a phosphor bronze material and has an annular plate shape. The second collar ring 22 has substantially the same inner diameter as the inner peripheral surface of the second housing 9B. The second collar ring 22 is interposed between the peripheral edge of the other end face 9BA (the right end face in FIG. 2) of the second housing 9B and the peripheral edge of the one end face (the left end face in FIG. 2) of the fixed ring 12. It is disguised. The second collar ring 22 formed using a phosphor bronze material is elastically deformable (has flexibility).

Each bolt 15 is inserted into the first housing 9A, the fixed ring 12 and the second housing 9B in a state of being inserted through the insertion holes 23 and 24 of the first and second collar rings 21 and 22. Accordingly, the first and second collar rings 21 and 22 are fixed to the housings 9A and 9B.
In this embodiment, the first and second collar rings 21 and 22 have specifications common to each other.

  A first annular step portion 27 is formed at one end (left side in FIG. 2) of the inner peripheral surface 25 of the first housing 9A. The first annular step portion 27 is continuous with the one end surface 9AA of the first housing 9A. The first annular step 27 constitutes a first regulating wall 29 that regulates deformation of the first collar ring 21 in the axial direction X. A first annular space 31 is defined by the first annular step portion 27 and the other surface 21A of the first collar ring 21. More specifically, the first restriction wall 29 is in contact with the other surface 21A (the right face in FIG. 2) of the inner peripheral portion of the first collar ring 21 that is elastically deformed, and the displacement of the first restriction wall 29 Regulate the amount. In other words, the first restriction wall is disposed on the main surface (the other surface 21A) opposite to the planetary roller 13 at the portion of the first collar ring 21 that contacts the planetary roller 13 via the first annular space 31. 29 is formed.

  The axial width W1 of the first annular space 31 in the axial direction X is a load of an assumed skew value (a desired pressure contact force of the planetary roller 13 × 0. The width is set to be larger than the elastic deformation amount of the inner peripheral portion of the first collar ring 21 along the axial direction X when a load having a size of 3 is applied. The axial width W1 of the first annular space 31 is set to a width smaller than the deformation amount when the first collar 21 is deformed until reaching the yield point.

  A second annular step 28 is formed at the other side (right side in FIG. 2) end of the inner peripheral surface 26 of the second housing 9B. The second annular step 28 is continuous with the other end surface 9BA of the second housing 9B. The second annular step portion 28 constitutes a second restriction wall 30 that restricts deformation of the second collar ring 22 in the axial direction X. A second annular space 32 is defined by the second annular step portion 28 and the one surface 22A of the second collar ring 22. More specifically, the second restriction wall 30 is in contact with the inner peripheral portion of one surface 22B (the left surface in FIG. 2) of the inner peripheral portion of the second collar ring 22 that is elastically deformed, so that the second restriction wall 30 is in contact. The amount of displacement of the wall 30 is regulated. In other words, on the main surface (one surface 22 </ b> B) side opposite to the planetary roller 13 in the portion of the second collar ring 22 that contacts the planetary roller 13, the second regulating wall is interposed via the second annular space 32. 30 is formed.

  The axial width W2 of the second annular space 32 in the axial direction X is a load of an assumed skew value at the portion of the second collar ring 22 in contact with the planetary roller 13 (the desired pressure contact force of the planetary roller 13 × 0. 3 is set to a width larger than the amount of elastic deformation of the inner peripheral portion of the second collar ring 22 along the axial direction X when a load having a size of 3 is applied. The axial width W2 of the second annular space 32 is set to be smaller than the deformation amount when the second collar ring 22 is deformed until reaching the yield point.

In this embodiment, the first and second second annular stepped portions 27 and 28 have specifications common to each other.
In the planetary roller 13, skew (inclination of the central axis of the planetary roller 13 with respect to the rotational axis along the axial direction X) and axial movement in the X direction may occur. FIG. 3 shows a case where the planetary roller 13 moves to the other side in the axial direction X (rightward in FIG. 2). In this case, the planetary roller 13 moved to the other side in the axial direction X (to the right in FIG. 2) contacts the inner peripheral portion of the first collar ring 21, and the second collar ring 22 is moved to the other side in the axial direction X ( Press toward the right of Fig. 2. Thereby, the inner peripheral part of the 1st collar ring 21 elastically deforms to the other (right side of FIG. 2) of the axial direction X, and curves. Since the pressing force from the planetary roller 13 is absorbed by the elastic deformation of the first collar ring 21, as a result, the pressing force (planetary roller 13) caused by the contact between the planetary roller 13 and the first collar ring 21. A sharp increase in the frictional force between the roller 13 and the collars 21 and 22 can be suppressed. When the force with which the planetary roller 13 presses the first collar ring 21 is large, the other surface 21 </ b> A (the left surface in FIG. 2) of the inner periphery of the curved first collar ring 21 is the first restriction wall 29. The amount of deformation of the first restricting wall 29 is restricted due to contact.

  On the other hand, when the planetary roller 13 moves in one of the axial directions X (left side in FIG. 2), the planetary roller 13 that has moved in the axial direction X on one side contacts the inner peripheral portion of the second collar ring 22. The second collar ring 22 is pressed toward one side in the axial direction X (left side in FIG. 2). Thereby, the inner peripheral part of the 2nd collar ring | wheel 22 is elastically deformed to one side (left side of FIG. 2) of the axial direction X, and curves. Since the pressing force from the planetary roller 13 is absorbed by the elastic deformation of the second collar ring 22, as a result, the pressing force (planetary roller 13) caused by the contact between the planetary roller 13 and the second collar ring 22. A sharp increase in the frictional force between the roller 13 and the collars 21 and 22 can be suppressed. When the force with which the planetary roller 13 presses the second collar ring 22 is large, one surface 22 </ b> A (the right surface in FIG. 2) of the inner periphery of the curved second collar ring 22 is formed on the second restriction wall 30. The amount of deformation of the second restriction wall 30 is restricted by contact.

  That is, if the planetary roller 13 presses the first collar ring 21 in the left direction in FIG. 2 as a result of skew or movement in the axial direction X, the inner peripheral portion of the second collar ring 22 is moved in the axial direction X. If the planetary roller 13 comes to press the second collar ring 22 in the right direction in FIG. The inner peripheral portion of the second collar ring 22 is elastically deformed to the other side in the axial direction X (to the right in FIG. 2).

  As described above, according to this embodiment, since the annular spaces 31 and 32 are formed on the opposite side of the planetary roller 13 in the portions where the planetary rollers 13 of the collar rings 21 and 22 are in contact with each other, Elastic deformation of the collars 21 and 22 accompanying the pressing contact with the rings 21 and 22 is allowed. Since the pressing force from the planetary roller 13 is absorbed by the elastic deformation of the collar rings 21 and 22, the pressing force of the collar rings 21 and 22 by the planetary roller 13 due to the contact between the planetary roller 13 and the collar rings 21 and 22 ( A sharp increase in the frictional force between the planetary roller 13 and the collars 21 and 22 can be suppressed. Thereby, rapid fluctuations in torque loss can be suppressed, and as a result, uneven rotation torque of the output shaft 6 can be suppressed.

  In addition, when the collar rings 21 and 22 receive a large pressing force from the planetary roller 13, the first and second collar rings 22 are expected to be greatly elastically deformed. The amount of elastic deformation of the collars 21 and 22 is regulated by contact with 21 and 22. Thereby, generation | occurrence | production of the damage of the collar rings 21 and 22 can be prevented beforehand. In particular, in this embodiment, the widths W1 and W2 in the axial direction X of the first and second annular spaces 31 and 32 are larger than the deformation amount when the corresponding collar rings 21 and 22 are deformed until they reach the yield point. Since the width is set to be small, the regulating walls 29 and 30 come into contact with the corresponding collar rings 21 and 22 before the collar rings 21 and 22 are plastically deformed. Thereby, damage to collar rings 21 and 22 can be prevented more effectively.

FIG. 4 is an enlarged cross-sectional view showing a main part of a planetary roller type transmission 105 according to another embodiment of the present invention.
Of the planetary roller transmission 105 according to another embodiment, the same reference numerals are assigned to the same components as those of the planetary roller transmission 5 according to the above-described embodiment, and the description thereof is omitted.
A planetary roller type transmission 105 according to another embodiment includes a first collar ring (annular restriction plate) 121 and a second collar instead of the collar rings 21 and 22 of the planetary roller type transmission 5 according to the above-described embodiment. A collar ring (annular restriction plate) 122 is provided.

  The first collar 121 includes a first annular plate-shaped portion 151 and the other one in the axial direction X from the first annular plate-shaped portion 151 (the right side in FIG. 4. A cylindrical first flange portion (annular portion) 161 projecting in a vertical direction (a direction intersecting the first annular plate-shaped portion 151) toward a direction away from the first annular plate-shaped portion 151, for example, a phosphor bronze material It is formed integrally using. The first annular plate-like portion 151 has substantially the same inner diameter as the inner peripheral surface 25 of the first housing 9A. The first collar ring 121 is interposed between the peripheral edge portion of the first end face 9AA of the first housing 9A and the peripheral edge portion of the other end face (four end faces in FIG. 2) of the fixed ring 12. The first collar ring 121 formed using a phosphor bronze material is elastically deformable (has flexibility).

  The second collar 122 includes a second annular plate-like portion 152 and one of the second annular plate-like portions 152 in the axial direction X (the left side in FIG. 4. And a cylindrical second flange portion (annular portion) 162 projecting in the vertical direction (direction intersecting the second annular plate-like portion 152) toward the opposite direction), for example, phosphor bronze material It is formed integrally using. The second annular plate-shaped portion 152 has substantially the same inner diameter as the inner peripheral surface 26 of the second housing 9B. The second collar ring 122 is interposed between the peripheral edge portion of the other end face 9BA of the second housing 9B and the peripheral edge portion of one end face (left end face in FIG. 4) of the fixed ring 12. The second collar ring 122 formed using a phosphor bronze material is elastically deformable (has flexibility).

Each bolt 15 is inserted into the first housing 9A, the fixed ring 12 and the second housing 9B in a state of being inserted through the insertion holes 123 and 124 of the first and second annular plate-like portions 151 and 152. Thus, the first and second collar rings 121 and 122 are fixed to the housings 9A and 9B.
The thickness of the first and second collar rings 121 and 122, particularly the thickness of the first and second annular plate-like portions 151 and 152, is the first and second collar rings according to the above-described embodiment. It is set thinner than 21 and 22, respectively.

In this embodiment, the 1st and 2nd collar rings 121 and 122 have the item which is mutually common.
At one end (left side in FIG. 4) of the inner peripheral surface 25 of the first housing 9A, a first annular step portion 127 continuous with the one end surface 9AA (left end surface in FIG. 4) of the first housing 9A. Is formed. A first restriction wall 129 that restricts deformation of the first collar ring 121 in the axial direction X is configured by the first annular stepped portion 127. A first annular space 131 is defined by the first annular step portion 127 and the other surface 121A of the first annular plate-like portion 151 of the first collar ring 121. The axial width W3 of the first annular space 131 in the axial direction X is a load of an assumed skew value (a desired pressure contact force of the planetary roller 13 × 0. When a load having a size of 3) is applied, the width is set such that the tip of the first flange portion 161 of the first flange ring 121 that is elastically deformed does not hit. The axial width W3 of the first annular space 131 is set to be smaller than the deformation amount when the first collar ring 121 is deformed until it reaches the yield point. In this respect, the first annular step portion 127 is different from the first annular step portion 27 of the above-described embodiment.

  A second annular step 128 that is continuous with the other end surface 9BA of the second housing 9B is formed at the other end (right side in FIG. 4) of the inner peripheral surface 26 of the second housing 9B. The second annular step portion 128 constitutes a second restriction wall 130 that restricts deformation of the second collar ring 122 in the axial direction X. A second annular space 132 is defined by the second annular step portion 128 and the other surface 122A of the second annular plate-like portion 152 of the second collar ring 122. The axial width W4 of the second annular space 132 in the axial direction X is a load of an assumed skew value (a desired pressure contact force of the planetary roller 13 × 0. The width is set such that the tip of the second flange portion 162 of the second collar ring 122 that is elastically deformed does not hit when a load having a size of 3 is applied. The axial width W4 of the second annular space 132 is set to be smaller than the deformation amount when the second collar ring 121 is deformed until it reaches the yield point. In this respect, the second annular step portion 128 is different from the second annular step portion 28 of the above-described embodiment.

  As mentioned above, according to this embodiment, in addition to the same operation effect as the above-mentioned embodiment, the following operation effect is produced. That is, since the annular plate-like portions 151 and 152 of the collar rings 121 and 122 are set to be thin, the collar rings 121 and 122 are more easily elastically deformed. Moreover, since the collar rings 121 and 122 have the flange portions 161 and 162, even if the wall thickness is reduced to increase the amount of elastic deformation, it is possible to prevent the strength from being lowered accordingly. That is, the elastic force of the collar rings 121 and 122 can be increased without reducing the strength of the collar rings 121 and 122. As a result of increasing the amount of elastic deformation of the collars 121 and 122, the pressing force from the planetary roller 13 to the collars 121 and 122 when the planetary roller 13 is pressed against the collars 121 and 122 is further absorbed. . Furthermore, since the flange portions 161 and 162 are provided, the revolution of the planetary roller 13 is stabilized without reducing the rigidity of the collar ring in the circumferential direction.

As described above, rapid fluctuations in torque loss can be further suppressed, and as a result, uneven rotation torque of the output shaft 6 can be suppressed.
FIG. 5 is an enlarged cross-sectional view showing a main part of a planetary roller type transmission 205 according to another embodiment.
The planetary roller type transmission 205 is in rolling contact with an input shaft (not shown), a fixed wheel 212 provided concentrically with the input shaft, and both the outer peripheral surface of the input shaft 211 and the inner peripheral surface of the fixed wheel 212. A plurality of planetary rollers 213 sandwiching each of the plurality of planetary rollers 213, the output shaft (not shown), the carrier 210 fixed to the output shaft, and the plurality of planetary rollers 213 in the axial direction X. And first and second collar rings 221 and 222 for restricting the movement in the axial direction X.

The first collar ring 221 is interposed between the first housing 209 </ b> A that holds an electric motor (not shown) that generates a rotational driving force transmitted to the input shaft 211 and the fixed ring 12. The second collar ring 221 is interposed between the second housing 209 </ b> B that holds the carrier 210 and the output shaft 206 and the fixed ring 212.
In this other form, the inner peripheral surfaces 225 and 226 of the first and second housings 209A and 209B are constituted by concave cylindrical surfaces. Therefore, an annular space is not formed on the opposite side of the planetary roller 213 at the portion of each collar ring 221, 222 that contacts the planetary roller 213. Therefore, the elastic deformation of the collar rings 221 and 222 is not allowed when the planetary roller 213 is pressed against the collar rings 221 and 222. Therefore, there is no escape space for the pressing force of the collar rings 221 and 222 by the planetary roller 213 (friction force between the planetary roller 213 and the collar rings 221 and 222) due to the contact between the planetary roller 213 and the collar rings 221 and 222. Therefore, the pressing force increases rapidly. As a result, a sudden fluctuation in torque loss is caused, and as a result, there is a possibility that unevenness occurs in the rotational torque of the output shaft.

As mentioned above, although two embodiment of this invention was described, this invention can also be implemented with another form.
For example, in each of the above-described embodiments, the inner diameter of the first housing 9A and the inner diameter of the second housing 9B are set to be approximately equal, so that the first and second collar rings 21, 22; The inner diameters are set to be approximately equal to each other. However, when the first and second housings 9A and 9B are different from each other, the inner diameters of the first and second collar rings 21 and 22; 121 and 122 are different from each other. .

In each of the above-described embodiments, the case where the regulation walls 29, 30; 129, 130 are provided in the housings 9A, 9B has been described. However, the regulation walls 9, 30; 129, 130 are attached to other members attached to the housings 9A, 9B. May be provided.
In each of the above-described embodiments, it has been described that the annular spaces 31, 32; 131, 132 are formed by the annular step portions 27, 28; 127, 128 perpendicular to the axial direction X. The annular spaces 31, 32; 131, 132 may be formed by a tapered surface that approaches the planetary roller 13 side as it goes.

Further, in each of the embodiments described above, the material of the collar rings 21, 22; 121, 122 has been described as a phosphor bronze material. However, hardened steel that is less worn and difficult to yield may be used as the material of the collar ring. .
Further, in each of the above-described embodiments, the case where the planetary roller transmissions 5 and 105 are mounted on the image forming apparatus has been described as an example. However, the present invention is also applied to a planetary roller transmission that is applied to other apparatuses. Can be applied.

  In addition, various design changes can be made within the scope of matters described in the claims.

DESCRIPTION OF SYMBOLS 5 ... Planetary roller type transmission, 6 ... Output shaft, 10 ... Carrier, 11 ... Input shaft, 12 ... Fixed wheel, 13 ... Planetary roller, 21 ... First collar ring (annular restricting plate), 22 ... Second Collar wheel (annular restriction plate), 29 ... first restriction wall, 30 ... second restriction wall, 31 ... first annular space, 32 ... second annular space, 105 ... planetary roller transmission, 121 ... First collar ring (annular restriction plate), 122 ... Second collar ring (annular restriction plate), 129 ... First restriction wall, 130 ... Second restriction wall, 131 ... First annular space, 132 ... Second annular space 161... First flange portion (annular portion), 162... Second flange portion (annular portion), W1... Axial width, W2... Axial width, W3. Axial width, X ... Axial direction

Claims (4)

An input shaft;
A fixed ring disposed concentrically on the input shaft around the input shaft;
A plurality of cylindrical planetary rollers in rolling contact with both the input shaft and the fixed ring;
An output shaft;
A carrier fixed to the output shaft and rotatably supporting each of the plurality of planetary rollers;
A pair of annular restricting plates that are provided so as to be elastically deformable, sandwich each of the plurality of planetary rollers in the axial direction, and restrict the movement of the plurality of planetary rollers in the axial direction;
The annular regulating plate includes a regulating wall that is disposed through an annular space on the opposite side of the planetary roller at a portion where the planetary roller comes into contact, and regulates an elastic deformation amount of each annular regulating plate, Planetary roller type transmission. The axial width of the annular space, wherein, when the load of skew assumed value in the portion where the planetary rollers are in contact in the annular regulating plate is applied, so that the annular regulating plate that is elastically deformed not hit the regulating wall The planetary roller transmission according to claim 1, wherein the planetary roller transmission is set to a wide width.   The planetary roller transmission according to claim 1 or 2, wherein an axial width of the annular space is set to be smaller than a deformation amount when the annular restricting plate is deformed until reaching a yield point. .   The planetary roller transmission according to any one of claims 1 to 3, wherein an annular portion protruding in a direction intersecting the annular restriction plate is formed at an axial end edge of the annular restriction plate.

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