JP2000120820A - Multistage roller transmission and planetary roller type power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize lubricating function at each contact part by arranging a thickness eliminating part continued in a circumferential direction on a part on an inner circum ferential surface of an outer ring which is brought into contact with a roller, in a transmission provided with multistage roller formed by multiply arranging a roller groups in a radial direction between a sun roller and the outer ring. SOLUTION: A sun roller 1 is mounted on one end of a high speed rotary shaft 7 journaled to one housing 6, and a plurality of first roller 3a is arranged on the fore-and-aft position of the sun roller 1. A plurality of second rollers 3b are supported to the housing 6 by a supporting shaft 9, and abuts on a rotary shaft of the first rollers 3a. An outer ring 2 which is brought into contact with the second roller 3b is mounted on an outer peripheral part of a holder 16 on a low speed rotary shaft 13 journaled to the other housing 12. A thickness eliminating part 4 continued to a circumferential direction and formed by eliminating a thickness of a part of an area is formed on an inner circumferential surface of the outer ring 2 so as to ensure lubricating property, increase contact surface pressure of a roller contact part, and improve power transmission performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage roller transmission having a multi-stage roller disposed between a sun roller and an outer ring, and a planetary planet having a planetary roller disposed between a sun roller and an outer ring. The present invention relates to a roller type power transmission device.

[0002]

2. Description of the Related Art In power transmission by gears, vibration and noise due to meshing of teeth are likely to occur. On the other hand, in the traction drive, power is transmitted through an oil film formed between the smooth rotating bodies that roll or slide, and thus has a feature of lower vibration and lower noise than a gear.

A typical traction drive having a constant speed ratio is a planetary roller type power transmission device as shown in FIG. This is one in which each gear constituting the planetary gear is replaced with a roller or a ring-shaped member, and a sun roller 31 and an outer ring 32 arranged with their axes aligned, and a space between the sun roller 31 and the outer ring 32. And a carrier 34 that holds the planetary rollers 33 rotatably at equal intervals in the circumferential direction. In this device, for example, by regulating the rotation of the ring 32 in the circumferential direction, the sun roller
Power transmission between 31 and carrier 34 is performed. In this planetary roller type power transmission device, it is possible to set the gear ratio to 10 or more, but from the balance between the contact surface pressure between the sun roller 31 and the planetary roller 33 and the contact surface pressure between the outer ring 32 and the planetary roller 33, A gear ratio of 3 to 6 is appropriate.

[0004] As a power transmission device capable of obtaining a larger gear ratio, there is a friction type multi-stage roller transmission. This is shown in FIG.
As shown in FIG. 25, the sun roller 1 and the outer ring 2 are arranged so that their axes coincide with each other, and the multi-stage roller 3 is arranged in a space formed between the sun roller 1 and the outer ring 2. Is done. The multi-stage roller 3 is configured by arranging a group of rollers arranged at equal intervals in the circumferential direction in multiple stages in the radial direction.
Or more. Then, by providing each roller of any of the roller groups with a plurality of outer peripheral surfaces (rolling surfaces) having different rotation radii, it is possible to achieve a gear ratio larger than that of the planetary roller type power transmission device.

In FIG. 24, a two-stage roller group (a first roller 3a and a second roller 3b) is arranged as the multi-stage roller 3, and only the first roller 3a is provided with a rolling surface having two kinds of turning radii. It is an example. If rotation around the sun roller 1 of the first roller 3a and the second roller 3b (revolution) is restricted, the speed ratio e is expressed by _{e = (R O R 1L)} / (R S R 1S).

On the other hand, when the rotation of the outer ring 2 is restricted instead of the rotation (revolution) of the first roller 3a and the second roller 3b around the sun roller 1, the speed ratio e
_{Is, e = (R O R 1L} ) / (R S R 1S) -1 25 represented by the multi-stage roller 3 as three stages of rollers (the first roller 3a, the second roller 3b, and a third roller 3c) and place
In this example, the first and second rollers 3a and 3b are provided with rolling surfaces having two types of rotation radii. If rotation around the sun roller 1 of each roller 3 a to 3 c (revolution) is restricted, the speed ratio e is expressed by _{e = (R O R 1L R} 2L) / (R S R 1S R 2S).

[0007] Rotation of each roller 3a-3c around sun roller 1
Instead of regulating (revolution), rotation of the outer ring 2
Is regulated, the gear ratio e is e = (R_OR
_1LR_2L) / (R_SR_1SR_2S) +1.

By increasing the number of stages in the radial direction as described above, it is possible to obtain a large reduction ratio while preventing an increase in size in the axial direction.

[0009]

In the friction type multi-stage roller transmission shown in FIGS. 24 and 25, power is transmitted by disposing each stage roller between the rolling surfaces of the sun roller 1 and the outer ring 2 in a pressure-contact state. Is applied to each contact portion, that is, a contact portion X between the sun roller 1 and the first roller 3a, a contact portion Y between the first roller 3a and the second roller 3b, and a contact portion between the second roller 3b and the outer ring 2. Z (see FIG. 26A). As shown in FIG. 26 (b), the sun roller 1 and the first roller 3a are in contact with each other at two positions spaced apart in the axial direction, and their rolling surfaces have widths of L _X1 and L _X2 , respectively.
And the widths of the contact surfaces Y and Z are L _Y and L _Z respectively.
Then, the axial widths of the contact portions X, Y, and Z are generally set to be substantially equal [(L _X1 + L _X2 ) ≒ L _Y ≒ L _Z ]. The contact surface pressure at each contact portion in this case is as shown in FIG.
Due mainly to the difference in the radius of curvature, a difference occurs in the contact surface pressure of each of the contact portions X, Y, and Z. In particular, when the widths of the contact portions X, Y, and Z are equal, the difference in the contact surface pressure is large, and the contact surface pressure of the contact portion Z is considerably smaller than the surface pressure of the contact portion Y.

[0010] Oil viscosity is exponential with increasing pressure
Is known to increase. Traction drive
The contact area of the
General and due to its high contact pressure,
Oil has a very high viscosity. Oil in such a state
Traction drive due to the large shear resistance of the membrane
Transmit power. As shown in FIG.
The number has pressure dependence and is relatively low, such as 1 GPa or less.
In the range of contact pressure, traction increases with increasing contact pressure.
The coefficient indicates an increasing characteristic. That is, as shown in FIG.
If the contact pressure of the contact part 3 is low,
The coefficient cannot be obtained, and the power transmission performance decreases. At the contact Z
Large interference allowance to obtain sufficient traction coefficient
When assembling the above friction type multi-stage roller transmission,
The contact pressure of the contact part X and contact part Y becomes excessive, and the life of the device
Greatly decreases.

[0011] In addition, the friction type multi-stage roller transmission
For stable operation over
Lubricating oil so that a sufficient oil film is formed
Need to be paid. Oil bath lubrication,
Or adopt forced lubrication to supply pumped lubricating oil
In this case, sufficient lubricating oil can be supplied to each contact,
Equipment size and cost by adding
Invite. For downsizing of equipment and reduction of manufacturing cost
It is desirable that the lubrication system be grease lubrication. I
However, in the case of grease lubrication,
Grease is eliminated, and lubricating oil is likely to be insufficient. friction
-Type multi-stage roller transmission reduces rolling pressure and reduces rolling fatigue.
To improve the service life, all contact parts should be in line contact
I have. In this way, the contact form at each contact is line contact
If, remove grease from the rolling surface during operation
Is more remarkable than point contact
No.

[0012] Therefore, the present invention provides a contact surface in each contact portion.
Reduces pressure fluctuations and lubrication function at each contact
The purpose is to stabilize.

[0013]

In order to achieve the above object,
In the present invention, a sun roller, an outer ring concentrically arranged on the outer peripheral side of the sun roller, and a roller group provided between the sun roller and the outer ring and arranged at equal intervals in the circumferential direction are arranged in multiple stages in the radial direction. And a sun roller, each stage roller and an outer ring are pressed against each other, and among the multi-stage rollers, each roller in at least one of the stages has a plurality of outer peripheral surfaces having different rotation radii. In the friction-type multi-stage roller transmission, a thinned portion continuous in the circumferential direction is provided in a part of the inner peripheral surface of the outer ring that comes into contact with the roller.

[0014] If the thinned portion is formed on the inner peripheral surface of the outer ring having the smallest contact surface pressure, the width of the contact portion with the roller in the axial direction is reduced, so that the contact surface pressure at the contact portion is reduced. Can be increased. Therefore, the difference from the contact surface pressure at other contact portions can be reduced, and the power transmission performance is improved by increasing the traction coefficient. Further, since the thinned portion also functions as an oil reservoir for retaining the lubricant, it is possible to stably supply the lubricant to the contact portion.

The above-mentioned thinned portion is formed, for example, in a groove shape,
Alternatively, it is formed by notching the axial end of the contact surface. The thinned portion may be formed in an annular shape or partially in the circumferential direction (formed in an arc shape).

If an oil-impregnated member is arranged in the thinned portion, more abundant oil can be supplied to the contact portion, and the lubricity is improved.

If the opening in the axial direction of the thinned portion formed at the time of contact with the roller is sealed, the thinned portion becomes a closed space, so that the lubricant can be confined in the thinned portion.
Further, when the oil-containing member is arranged in the meat removing portion, the oil-containing member is prevented from falling off. The sealing can be performed by a side plate for restricting the axial movement of the roller, or a flange formed by extending the inner peripheral surface of the outer ring toward the inner diameter side.

[0018] The bottom surface of the thinned portion is cylindrical and conical
It can also be.

From the same viewpoint as above, a sun roller, an outer ring concentrically arranged on the outer peripheral side of the sun roller,
A planetary roller device provided between a sun roller and an outer ring and having planetary rollers arranged at equal intervals in a circumferential direction, wherein a sun roller, a planetary roller and an outer ring are pressed against each other. Can be made substantially the same as the contact surface pressure between the sun roller and the roller.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1A and 1B show one embodiment of a multi-stage roller transmission according to the present invention. As shown in the figure, this multi-stage roller type transmission has a sun roller 1, an outer ring 2 concentrically arranged on the outer peripheral side of the sun roller 1, and a circumference between the outer peripheral surface of the sun roller 1 and the inner peripheral surface of the outer ring 2. A multi-stage roller 3 in which a group of rollers arranged at equal intervals are pressed and arranged in multiple stages in the radial direction is configured as a main component. It is sufficient that the multi-stage rollers 3 are arranged in a plurality of stages, and the number of stages is not limited (two stages in FIG. 24, three stages in FIG. 25, or more stages may be used). An example in which the roller 3a and the second roller 3b are configured in two stages will be described. The number of roller groups in each stage is not limited, but is preferably three or more. In the present embodiment, a case is exemplified in which four rollers 3a and 3b in each stage are arranged.

[0022] The first roller 3a is an axial direction having two turning radii.
It is formed in an H-shaped section. The outer peripheral surface of the first roller 3a
The outer peripheral surface on the large diameter side is the sun roller 1 and the outer peripheral surface on the small diameter side is
Are in pressure contact with the second rollers 3b, respectively. 2nd roller 3b
Is a pair of bolts bolted to both end faces of the outer ring 2.
Moved in the axial direction by being clamped from both sides in the axial direction by the side plate 8
Is regulated. The second roller 3b is a first roller
3a is fitted into the recess between the large diameter parts.
Rollers 3a and 3b regulate the axial movement of the other roller
It has a structure that works together. Sun roller 1 and first roller 3a
Contact portions X are located at two places separated in the axial direction.
The axial width of the two contact parts is L_X1, L_X2And the first b
Contact portion Y between roller 3a and second roller 3b,
The axial width of the contact portion Z between the ring 2 and the second roller 3b
L_Y, L_ZThen, (L_X1+ L_X2) ≒ L_Y> L_ZNoseki
The engagement holds.

FIG. 2 shows the overall structure of the friction type multi-stage roller transmission. The sun roller 1 is mounted on one end of a high-speed rotating shaft 7 rotatably supported on one housing 6 by two bearings 5. The second roller support shafts 9 for the number of the second rollers 3b are implanted in the housing 6, and the second rollers 3b are supported by the second roller support shafts 9 via bearings 10 so that the second roller 3b is supported. 3b, and the rotation (revolution) of the first roller 3a around the high-speed shaft 7 is restricted. A low-speed rotating shaft 13 is rotatably supported on the other housing 12 via two bearings 14. The housing 6 and the housing 12 are bolted so that the high-speed shaft 7 and the low-speed shaft 13 are coaxially arranged. And so on. In FIG. 2, the outer ring 2 and the low-speed shaft 13 are connected by a separate member (outer ring holder 16), but the low-speed shaft 13 and the outer ring 2 are integrally formed to form an inner peripheral surface of one end of the low-speed shaft 13. The outer peripheral surface of the two rollers 3b may be brought into contact.

FIG. 3 is an overall structural diagram in which the rotation of the outer ring 2 is regulated instead of regulating the rotation (revolution) of the first roller 3a and the second roller 3b around the sun roller 1. As in FIG. 2, the outer ring 2 and the sun roller 1
In the meantime, the four first rollers 3a and the second rollers 3b are respectively arranged at equal circumferential intervals in a pressed state. The outer ring 2 is mounted on the housing 6 so as to be coaxial with the high-speed shaft 7.
Is fixed with bolts 17. The second roller supporting shafts 9 are implanted in the large-diameter portion of the shaft end of the low-speed shaft 13 by the number of the second rollers 3b, and the second rollers 3b are connected to the second roller supporting shaft 9 via bearings 10. It is supported rotatably.

In the present invention, as shown in FIG. 1 to FIG. 3, a part of the inner peripheral surface of the outer ring 2 which comes into contact with the second roller 3b is lightened to remove the peripherally continuous thinning. The part 4 is formed. FIG. 4 shows an example of the thinned portion 4 in which annular notches 4 a are provided at both axial ends of the inner peripheral surface of the outer ring 2. The axially central side of the outer ring 2 is a rolling surface 2a that is in rolling contact with the outer peripheral surface of the second roller 3b. The thinning portion 4 may be provided in a part in the circumferential direction, and may be formed in an arc shape, instead of being provided in an annular shape. In addition, this meat removing section 4
It can be applied regardless of whether or not the rotation (revolution) of each roller 3a, 3b around the sun roller 1 is regulated.

[0026] By providing the thinning portion 4, the outer
Width L of the contact portion Z between the ring 2 and the second roller 3b_ZIs the first row
Width L of the contact portion Y between the roller 3a and the second roller 3b_YSmaller than
(L_Z<L_Y). As a result, as shown in FIG.
By increasing the contact surface pressure of the contact portion Z, the contact
The difference in contact pressure can be reduced, and the power transmission of the device
Performance can be improved. In addition, as described above, the contact portion Z
When the contact surface pressure is increased, the fatigue life at the contact portion Z becomes shorter.
Although there is a concern about lowering
The sun roller 1 having the contact portion X
In addition, as shown in FIG.
Even if the surface pressure of the contact portion Z is increased,
The fatigue life of the entire machine does not decrease significantly. Therefore,
Width L at contact Z_ZMeans that the contact surface pressure is
Below the contact pressure (less than the lowest of both contact pressures)
In the axial width corresponding to the contact surface pressure
It is desirable to specify.

[0027] Also formed on the inner peripheral surface of the outer ring 2.
The thinned portion 4 is filled with a lubricant (lubrication) sealed inside the transmission.
Oil or lubricating grease)
Also works, so that lubricant is stably supplied to the contact portion Z.
be able to. The lubricant supplied to the contact portion Z is
Stable supply to the contact part Y by adhering to the roller 3b
Contacting the first roller 3a.
X is supplied stably. In addition, the meat removing section 4 includes a second roller 3b.
Has an opening in the axial direction at the time of contact with
Is sealed by the side plate 8 as shown in FIG.
Oil accumulated in the meat portion 4 is stably supplied to the contact portion Z without leaking.
Be paid.

FIGS. 6 (a) and 6 (b) show the thinned portion 4 formed as a groove 4b at the center of the inner peripheral surface of the outer ring 2 from the axial end. (A) shows a case where two grooves 4b are arranged in parallel, and (b) shows a case where one groove 4b is provided. These grooves 4b form a completely sealed space when the second roller 3b comes into contact with the outer ring 2, so that the grooves 4b
The oil accumulated in the contact portion Z is supplied stably to the contact portion Z without leaking.

[0029] FIG. 7 shows the axial direction of the inner peripheral surface of the outer ring 2.
Two grooves 4b are juxtaposed as a thinned portion 4 on the center side from the end,
Furthermore, the inner peripheral surface on the axial end side is larger than the inner peripheral surface on the center side.
By forming to the diameter (D₁<D_Two), Axial direction of each groove 4b
Only the inner peripheral surface on the side facing the center is the rolling surface 2a.
You. In this case, as shown in FIG. 8, contact with the second roller 3b is performed.
When touching, the outer peripheral surface of the second roller 3b and the side plate 8 form the groove 4b.
Since it is sealed, the ability to hold the lubricant in the groove 4b is increased.
Can be.

As shown in FIG. 9, the thinned portion 4 is closed with a side plate 8 (right side in the drawing), and a flange 2b formed by extending the inner diameter of one end of the outer ring 2 toward the inner diameter. You may. This flange portion 2b also plays a role of restricting the axial movement of the second roller 3b, like the side plate 8.

[0031] The bottom surface of the thinned portion 4 is a cylindrical surface as described above.
Alternatively, a conical surface may be used. Fig. 10 (a) shows the outer
The bottom surface of the notch 4a provided at both ends in the axial direction of the
This is an example. Also in this case, as shown in FIG.
By sealing the notch 4a with the side plate 8 (sealing with the flange 2b)
The notch 4a can be a closed space.

[0032] Each of the above-mentioned meat removing portions 4 has an oil held therein.
May be disposed. FIG.
(A) and (b) are examples of such a case, and (a) shows two notches 4a.
The oil-impregnated member 18 is disposed in the groove 4b.
This is an example in which 18 is arranged. As the oil-impregnated member 18, sintered
A porous member molded from a material impregnated with lubricating oil,
A foamable resin such as polyethylene is molded into a porous
Which is impregnated with lubricating oil, or polyethylene
Solidifies the mixture of resin and lubricating oil by heating and cooling
What was done, etc. can be used. Whichever oil-impregnated member
However, since the exuded oil is supplied to the contact area,
Improved lubricity is achieved. Cross-sectional shape of oil-impregnated member 18
Is sufficient if it has a shape and dimensions that can be accommodated in the meat removing section 4.
In addition, the length direction is annular and a part of the circumference is
It may be in the form of a string arranged only in the area.

The above configuration can be similarly applied to the planetary roller type power transmission shown in FIG.
That is, a circumferentially continuous thinned portion is provided in a partial area of the inner peripheral surface of the outer ring 32, and the contact surface pressure between the outer ring 32 and the planetary roller 33 is substantially equal to the contact surface pressure between the sun roller 31 and the planetary roller 33. They are set to the same level. Any of the configurations shown in FIG. 4 to FIG. 11 can be applied as the mode of the fillet portion.

[0034] Use the above multi-stage roller transmission as a gearbox.
If used, the high speed shaft 7 and the low speed shaft 13 of the roller transmission
Are connected to the rotating shaft of the load side and the rotating shaft of the prime mover, respectively.
It is. When used as a reduction gear, the high-speed shaft 7 and
The low-speed shaft 13 and the load-side rotation shaft
Each is connected. Serrations are used as these connection methods.
When using components or couplings,
And serrations on the high-speed axis 7 and low-speed axis 13
Alternatively, since the keyway is provided, the number of processing steps increases. Also,
When using the spline connection method,
Although it is easier to attach and detach than
Since a line is provided, the number of processing steps increases.

In order to solve this problem, a hollow cylindrical portion is formed on the input member or the output member of the transmission, and a roller type one-way clutch is inserted into the hollow cylindrical portion.
It is preferable that a driving-side rotating shaft or a load-side rotating shaft be inserted into the inner peripheral portion of the roller clutch. Further, a hollow cylindrical portion is formed on the rotating shaft of the prime mover or the rotating shaft on the load side, a roller type one-way clutch is inserted into the hollow cylindrical portion, and an input member or an output member of the transmission is mounted on an inner peripheral portion of the roller clutch. May be inserted. The input member may be either a high-speed side or a low-speed side rotation axis, and the output member is an opposite side (low-speed side or high-speed side) rotation axis.

With the above configuration, when power is always transmitted from the prime mover by rotation in one direction, the shaft can be easily attached and detached as compared with the connection method using serrations and couplings. In addition, there is no need to provide serrations or key grooves in the connecting portion, and the processing cost can be reduced.

FIGS. 12 to 17 show an embodiment using the roller-type one-way clutch 20, and FIGS.
FIG. 17 shows an embodiment in which the rotation (revolution) of the first roller 3a and the second roller 3b around the sun roller 1 is restricted.
Is an embodiment in which the rotation (rotation) of the outer ring 2 is restricted.

[0038] FIG. 12 shows an outer member serving as an input / output member on the low-speed side.
Roller holder 16 and roller type one-way clutch 20
Through the outer ring 2 and the driving side rotating shaft or load
Shows a case where rotation is transmitted to the side rotation shaft 21.
You. In the figure, the outer ring 2 and the outer ring holder
Da 16 is connected with bolt 22 and nut 23, but both members
May be combined by press fitting. Outer ring holder
16 has a hollow cylindrical portion 24, and a roller type
One-way clutch 20 is inserted, and this one-way clutch
The drive side or load side rotation is
The turning shaft 21 is inserted.

FIG. 13 illustrates an embodiment in which the outer ring 2 and the outer ring holder 16 are integrally formed. A hollow cylindrical portion 24 for inserting the roller type one-way clutch 20 is formed on the outer ring 2, and the rotation of the outer ring 2 is transmitted to the driving side or load side rotating shaft 21 via the roller type one-way clutch 20. Is transmitted.

FIG. 14 shows a rotating shaft on the driving or load side.
A hollow cylindrical portion 24 is formed in the hollow cylindrical portion 24, a roller type one-way clutch 20 is inserted into the hollow cylindrical portion 24, and a shaft portion 16a of the outer ring holder 16 is further provided on an inner peripheral portion of the roller type one-way clutch 20.
(Low speed shaft 13) is inserted.

FIGS. 15 and 16 show a high speed shaft 7 and a driving or load side rotating shaft via a roller type one-way clutch 20.
21 shows an embodiment in the case where rotation is transmitted to and from a motor 21. In FIG. 15, one end of the high-speed shaft 7 is a sun roller.
A hollow cylindrical portion 24 for inserting the roller-type one-way clutch 20 is formed in the shaft, and a driving-side or load-side rotating shaft 21 is inserted into an inner peripheral portion of the one-way clutch 20. On the other hand, in FIG. 16, a hollow cylindrical portion 24 for inserting the roller-type one-way clutch 20 to the rotating shaft 21 on the driving side or the load side is shown.
The high-speed shaft 7 whose one end is the sun roller 1 is inserted into the inner peripheral portion of the one-way clutch 20.

FIG. 17 shows an embodiment in which the rotation of the outer ring 2 is restricted. The second roller support shafts 9 of the number equal to the number of the second rollers 3b are provided on the second roller carrier 25 which is the input / output member on the low speed side. Is planted. Further, a hollow cylindrical portion 24 for inserting the roller-type one-way clutch 20 is formed in the second roller carrier 25, and the driving-side or load-side rotating shaft 21 is inserted into the inner peripheral portion of the one-way clutch 20. Is done.

FIGS. 18 and 19 show the roller type one-way clutch 20 housed in the hollow cylindrical portion 24. FIG. The roller type one-way clutch 20 is a roller having the clutch function.
It is characterized in that bearings 20b for applying a radial load are provided on both axial sides of 20a. FIG. 18 shows a case where the bearing 20b is a needle roller bearing, and FIG. 13 shows a case where it is a sliding bearing such as an oil-impregnated bearing.

[0044]

As described above, according to the present invention, the circumferentially thinned portion is formed on the inner peripheral surface of the outer ring having the smallest contact surface pressure. Can be reduced, and the contact surface pressure at the contact portion can be increased. Therefore, the difference from the contact surface pressure at other contact portions can be reduced, and the power transmission performance is improved by increasing the traction coefficient. Further, unlike the case where a large interference is added, the contact surface pressure at another contact portion does not become excessive and the life of the device is not shortened.

If an oil-impregnated member is arranged in the meat removing portion, a more abundant oil can be supplied to the contact portion, and the lubricity can be further improved.

If the opening in the axial direction of the thinned portion formed at the time of contact with the roller is sealed, the thinned portion becomes a closed space, so that the lubricant can be confined in the thinned portion. Excellent effect for stable supply of lubricant. Further, when the oil-containing member is arranged in the meat removing portion, it can be prevented from dropping off.

[Brief description of the drawings]

1A and 1B are diagrams showing an embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along line AA in FIG. 1B, and FIG. 1B is a cross-sectional view in a radial direction.

2A and 2B are diagrams showing an embodiment of the present invention, in which FIG. 2A is a cross-sectional view taken along line BB in FIG. 2B, and FIG. 2B is a cross-sectional view taken along line AA in FIG. FIG.

3A and 3B are diagrams showing an embodiment of the present invention, in which FIG. 3A is a sectional view taken along line BB in FIG. 3B, and FIG. 3B is a sectional view taken along line AA in FIG. FIG.

FIG. 4 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 5 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 6 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 7 is an enlarged sectional view in the axial direction showing an embodiment of the present invention.

FIG. 8 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 9 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 10 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 11 is an enlarged sectional view in the axial direction showing the embodiment of the present invention.

FIG. 12 is an axial sectional view of a multi-stage roller transmission having a roller-type one-way clutch.

FIG. 13 is an axial sectional view of a multi-stage roller transmission having a roller-type one-way clutch.

FIG. 14 is an axial sectional view of a multi-stage roller transmission having a roller-type one-way clutch.

FIG. 15 is an axial sectional view of a multi-stage roller transmission having a roller-type one-way clutch.

FIG. 16 is an axial sectional view of a multi-stage roller transmission having a roller type one-way clutch.

FIG. 17 is an axial sectional view of a multi-stage roller transmission having a roller-type one-way clutch.

FIG. 18 is an enlarged sectional view in the axial direction showing a structure of a roller-type one-way clutch.

FIG. 19 is an enlarged sectional view in the axial direction showing a structure of a roller type one-way clutch.

FIG. 20 is a diagram showing a relationship between interference and average contact surface pressure in the product of the present invention.

FIG. 21 is a diagram showing the relationship between the interference and the average contact surface pressure in a conventional product.

FIG. 22 is a perspective view of a planetary roller type power transmission device.

FIG. 23 is a diagram showing a relationship between a slip / roll rate and a traction coefficient at different pressures.

24A and 24B are diagrams showing a schematic structure of a conventional multi-stage roller transmission, wherein FIG. 24A is a front view, and FIG.
It is sectional drawing in a line.

FIG. 25 is a front view showing a schematic structure of a conventional multi-stage roller transmission.

FIG. 26 is a view showing a conventional multi-stage roller transmission, and FIG.
The figure is a sectional view in the radial direction, and the figure (b) is the AA in the figure (a).
It is sectional drawing in a line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sun roller 2 Outer ring 2b Collar part 3 Multi-stage roller 3a 1st roller 3b 2nd roller 4 Filling part 4a Notch 4b Groove 8 Side plate 18 Oil impregnated member

Claims (9)

[Claims] A sun roller and an outer peripheral side of the sun roller
Outer ring centered, sun roller and outer
Rows provided between rings and arranged at equal intervals in the circumferential direction
And a multi-stage roller in which the roller groups are arranged in multiple stages in the radial direction.
The sun roller, each roller and the outer ring.
At least one of the multi-stage rollers
Each roller in that stage has multiple outer radii with different turning radii.
In a friction type multi-stage roller transmission with a peripheral surface,  In a part of the inner peripheral surface of the outer ring that contacts the roller,
Multi-stage characterized by having a circumferentially thinned part
Roller transmission. 2. The multi-stage roller transmission according to claim 1, wherein the thinned portion is groove-shaped. 3. The multi-stage roller transmission according to claim 1, wherein the thickness reducing portion is a notch provided at an end in the axial direction. 4. The multi-stage roller transmission according to claim 1, wherein an oil-impregnated member is disposed in the thinning portion. 5. The multi-stage roller transmission according to claim 1, wherein an axial opening of the thinned portion formed at the time of contact with the roller is closed. 6. The multi-stage roller transmission according to claim 5, wherein the opening is sealed with a side plate for restricting axial movement of the roller. 7. The multi-stage roller transmission according to claim 5, wherein the opening is sealed by a flange formed by extending an inner peripheral surface of the outer ring toward an inner diameter side. 8. The multi-stage roller transmission according to claim 1, wherein the bottom surface of the thinned portion is a cylindrical surface or a conical surface. 9. A sun roller and an outer peripheral side of the sun roller.
Outer ring centered, sun roller and outer
Planets installed between rings and arranged at equal intervals in the circumferential direction
Roller, sun roller, planetary roller and outer
In a planetary roller device where the sealings are pressed against each other,  The contact pressure between the outer ring and the planetary rollers is
The feature is that it is almost the same as the contact surface pressure between the roller and the roller.
Planetary roller type power transmission device.