JP3528516B2 - Friction roller type transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various mechanical devices.
Incorporates to reduce the rotational driving force of the drive unit such as an electric motor
Or a friction roller type transmission that transmits to a driven part while increasing the speed
When the power of the drive unit is not necessary for the improvement of
By preventing parts from becoming loads,
It is intended to improve efficiency. 2. Description of the Related Art A friction roller type transmission is known as a planetary gear type or the like.
Occurs even when operating at higher speeds than a gear transmission.
Noise is small. Utilizing such a friction roller type transmission
The power of the electric motor is used as auxiliary power to power the bicycle.
Electric assisted bicycle that reduces the treading force required to step on the dull
Is described in, for example, JP-A-7-95744.
As is known from the prior art. FIG.
It is a block diagram of the drive device with auxiliary powers, such as a turning vehicle. rotation
To drive a load 1 such as a car gear,
A first input unit 2 and a second input unit 3 which is an electric motor
Are provided in parallel with each other. Compared to the first input unit 2
Subsequent stage of the second input unit 3 which is high-speed but low-torque
The section is provided with a speed reducer 4, which is input from the second input section 3.
The speed of the applied power is reduced and the torque is increased. the above
The second input unit 3 uses the sensor (not shown) to
The driving force applied from the input unit 2 is detected, and this driving force is detected.
And generates a driving force corresponding to the first input unit 2.
Even if the obtained force is small, the load 1 can be driven freely. Immediately
That is, the driving torque T generated in the first input unit 2 ₁ In response
Drive torque T _Two The second input unit 3 and the speed reducer
4 generated. And, these two driving torques T
₁ , T _Two Are joined at the joining section 5 and these two driving torques are combined.
T ₁ , T _Two Drive torque T _Three (Loss due to friction, etc.
If loss is not taken into account, T _Three = T ₁ + T _Two )
The load 1 is driven. By the way, for example, consider a bicycle with an auxiliary power.
Pedals despite a gentle downhill or strong tailwind
Required to drive the load 1 when stepping on
Torque T _Three Drive torque applied to the first input unit 2
K T ₁ Becomes larger (T ₁ > T _Three ) In some cases. Like this
In this case, the drive torque applied to the first input unit 2
K T ₁ Of the torque T required to drive load 1 _Three To
Excess torque (T ₁ -T _Three ) Is an arrow in FIG.
As shown, the second input unit from the junction 5 through the speed reducer 4
Backflow to 3 Then, the second input unit 3 is configured
The electric motor rotor is driven to rotate. As a result,
The driving torque T applied to the first input unit 2 ₁ Is load 1
Is not effectively used for driving the first input unit 2
Torque T ₁ The force required to generate the
The treading force required to step on) increases unnecessarily. In order to eliminate such inconvenience, conventionally,
A one-way clutch is provided between the speed reducer 4 and the junction 5;
Power can be freely transmitted only from the reduction gear 4 to the junction 5
And had On the other hand, the speed reducer 4 is generally used.
Change from friction roller type to wedge roller type
By omitting the one-way clutch,
For example, it is considered as in Japanese Patent Application No. 9-061329. Figure
Reference numeral 17 denotes such a wedge roller type friction roller type transmission.
1 schematically shows the structure of the machine. [0005] This wedge roller type friction roller type transmission
The machine has a center roller 7 having an outer peripheral surface as a first cylindrical surface 6,
The inner peripheral surface as a second cylindrical surface 8 around the center roller 7
The center roller 7 is freely rotatable relative to the center roller 7.
An outer ring 9 is provided. The center roller 7 has a first rotating shaft.
And fixed to the end of the outer ring 9 concentrically with the first rotating shaft.
The end of the second rotating shaft is fixedly connected to the outer ring 9 concentrically.
Set. Of the first cylindrical surface 6 and the second cylindrical surface 8
In the annular space 10 between, three pivots 11a, 11b,
The central roller 7 and the outer ring 9 are arranged in parallel with each other.
Intermediate rollers 12a, 12b by pivots 11a, 11b,
12c is rotatably supported. Each of these intermediate rows
The outer peripheral surfaces of the rollers 12a, 12b and 12c
These third cylindrical surfaces 13, 1
3 is brought into contact with the first and second cylindrical surfaces 6 and 8.
You. The center of the center roller 7 and the center of the outer ring 9
By eccentrically adjusting the width of the annular space 10 to a circle.
It is uneven throughout the circumference. And among the above three
One intermediate roller of the intermediate rollers 12a, 12b, 12c
Roller 12a in the circumferential direction of the annular space 10 slightly.
The wedge roller is supported so that it can be
The wedge roller is formed by a spring 14 as a pressure means.
The intermediate roller 12a to the narrow portion of the annular space 10
, And is elastically pressed. In the friction roller type transmission constructed as described above,
When the rotational force is transmitted, for example, the center roller 7
Rotate clockwise in FIG. 17 as indicated by arrow A in FIG.
And an intermediate roller 12a serving as the wedge roller.
As shown by an arrow B in the figure, a counterclockwise rotation around the pivot 11a is performed.
And the outer ring 9 rotates in the opposite direction as indicated by the arrow C.
Rotate clockwise. Thus, the intermediate roller 12a
Rotates as indicated by the arrow B, and sandwiches the intermediate roller 12a.
The center roller 7 and outer ring 9 held by
As a result, the entire intermediate roller 12a is rotated as shown in FIG.
As shown by an arrow d in FIG.
It tends to be. That is, the intermediate roller 12a is
From the center roller 7 that rotates in the direction
The intermediate roller 12a itself rotates in the direction of arrow B
As a result, the contact with the second cylindrical surface 8 provided on the inner peripheral surface of the outer ring 9 is achieved.
Again, due to the reaction from the contact,
Receive strength. As a result, when the center roller 7 rotates,
The intermediate roller 12a is located at a narrow portion of the annular space 10.
They tend to move toward minutes. And this middle row
The third cylindrical surface 13 provided on the outer peripheral surface of the
The first cylindrical surface 6 provided on the outer peripheral surface of the center roller 7 and the outer ring 9
The second cylindrical surface 8 provided on the inner peripheral surface is strongly pressed. this
As a result, the third cylindrical surface 13 and the first cylindrical surface 6
The inner diameter side contact portion 15 which is a contact portion, and the third cylinder
An outer diameter side contact which is a contact portion between the surface 13 and the second cylindrical surface 8
The contact pressure of the contact portion 16 increases. The intermediate roller 12 serving as the wedge roller
The contact pressure of both inner and outer contact portions 15, 16 with respect to a
Becomes higher, the outer circumference of the intermediate roller 12a is increased.
A member pressed by a third cylindrical surface 13 provided on the surface.
At least one of the center roller 7 and the outer ring 9
The other member is based on the assembling gap or elastic deformation, etc.
Slight displacement over each diametric direction. As a result,
Provided on the outer peripheral surface of the remaining two intermediate rollers 12b and 12c.
Contact between third cylindrical surfaces 13 and 13 and first cylindrical surface 6
Two inner-diameter-side contact portions 15, 15, and
The contact between each third cylindrical surface 13, 13 and the second cylindrical surface 8
The contact pressure of the two outer diameter side contact portions 16, 16 which are contact portions
Get higher. Intermediate row that functions as the above wedge roller
The annular space 10 within the annular space 10
The force to move toward the narrow part is
According to the magnitude of the torque transmitted from the roller 7 to the outer ring 9
Will change. And, as this force increases, each of the above
The contact pressure between the inner and outer contact portions 15, 16 is increased.
You. Therefore, the contact pressure according to the torque to be transmitted is automatically adjusted.
To ensure the transmission efficiency of the friction roller type transmission
You. In the above example, the center roller 7 is used as the input side,
By using the outer ring 9 as the output side, the friction roller type transmission can be used.
The case where it is used as a speed reducer is shown. In contrast
The outer ring 9 as an input side and the center roller 7 as an output side.
Using friction roller type transmission as gearbox
Also in the case, except for the rotation direction being reversed,
The contact pressure according to the transmitted torque is automatically selected and
While ensuring the transmission efficiency of the friction roller type transmission,
Power can be transmitted between the motor and the center roller 7. On the other hand, the member on the output side is
When rotating at a speed higher than the speed corresponding to the member,
The intermediate roller 12a functioning as a wedge roller is
It tends to move to the wide part of the annular space 10,
Each of the inner diameter side contact portions 15, 15 and the outer diameter side contact portion 16,
16, the contact pressure between the center roller 7 and the outer ring 9 is reduced.
Power transmission between them is cut off. That is, the friction roller type
When a speed machine is used as a speed reducer, the center roller 7 is
The outer ring 9 moves in the direction of arrow C in FIG.
When the intermediate roller 12a rotates, the intermediate roller 12a
Move to the wide part of the annular space 10 against the elasticity
It tends to be. Using the above friction roller type transmission as a gearbox
When using the above, keep the outer ring stopped
When the center roller 7 rotates in the direction opposite to the arrow A in FIG.
The intermediate roller 12a resists the elasticity of the spring 14
It tends to move to the wide part of the annular space 10.
You. Thus, a wedge roller type friction roller type transmission
In the case of, the speed of the output side member depends on the input side member.
When rotating at a higher speed than the center roller 7 and the outer ring 9
Disconnect power transmission between For this reason, FIG.
6, the one between the speed reducer 4 and the junction 5
The second input, which is an electric motor,
A drive to be applied to the first input unit 2 based on the presence of the unit 3
It is possible to prevent the power from becoming too large. [0010] Like an electric assist bicycle, it should be added to the load 1.
When the direction of the driving force is fixed,
A wedge roller type friction roller as shown in FIG.
If a gear-type transmission is used, the one-way clutch can be omitted.
Cost and transmission efficiency by optimizing the contact pressure
It is compatible with securing. In contrast, load 1
When the direction of the driving force is not constant, as shown in FIG.
A simple friction roller type transmission cannot be used. That is, FIG.
In a friction roller type transmission as shown in
Acts as a wedge roller when the direction of rotation is reversed
The intermediate roller 12a moves to the wide portion of the annular space 10.
And each inner diameter side contact portion 15, 15 and each outer
When the contact pressure of the radial contact portions 16, 16 is lost, the center roller
Power cannot be transmitted between the outer ring 7 and the outer ring 9. example
Like amusement park playground equipment or a paddling boat,
It is a device that drives by stepping on the dull, and the pedal is moved in both directions
Parts that may be rotated include a friction as shown in FIG.
A roller-type transmission cannot be used. In such a case, as shown in FIG.
Of the intermediate rollers 12a, 12b, 12c
Intermediate rollers 12a and 12b function as wedge rollers
A friction roller type transmission having a structure for causing the friction roller transmission is used. This figure 1
8 is described in U.S. Pat. No. 4,709,589.
1 schematically illustrates a friction roller type transmission. This second example of friction
In the case of a roller type transmission, three intermediate rollers 12a,
12b, 12c, two intermediate rollers 12a, 12c.
b is slightly changed in the circumferential direction of the annular space 10.
A wedge roller is provided by freely supporting it.
Then, these two intermediate rollers that become wedge rollers
12a and 12b are directed toward the narrow portion of the annular space 10.
In the circumferential direction, the springs 14 as pressing means
Elastic in opposite directions (directions approaching each other)
Is pressed. According to the structure of the second example, the center
Regardless of the relative rotation direction between the roller 7 and the outer ring 9,
The two intermediate rollers 12a, 1 serving as the wedge rollers
2b, one of the intermediate rollers 12a (or 12b).
b) bites into the narrow part of the annular space 10,
Each inner diameter side contact portion 15, 15 and each outer diameter side contact portion 16, 1
Secure the contact pressure of 6. Therefore, the rotation of the power to be transmitted
Regardless of the direction, the transmission efficiency can be secured by optimizing the contact pressure.
Wear. [0012] As shown in FIG.
Transmission efficiency can be ensured regardless of the rotation direction of the power to be achieved
In the case of a friction roller type transmission, as shown in FIG.
Thus, the torque T required to drive the load 1 _Three First than
Drive torque T applied to one input unit 2 ₁ Grows larger
(T ₁ > T _Three ) In the case, the drive torque is
K T ₁ The force required to generate the unnecessarily increases. Immediately
That is, in the case of the friction roller type transmission shown in FIG.
Regardless of the relative rotation direction between the center roller 7 and the outer ring 9,
Power is transmitted between the center roller 7 and the outer ring 9.
Therefore, the torque T required to drive the load 1 _Three than
Drive torque T applied to first input unit 2 ₁ Is bigger
Then, the power input by the human input from the first input unit 2 is used.
In addition to the load 1, the electric
The motor must also be driven. As a result,
Since the force to be applied to the first input unit 2 is unnecessarily large,
Not good. A single intermediate roller as shown in FIG.
Friction law that allows only 12a to function as a wedge roller
In the case of a gear type transmission as well, the rotational force in the opposite direction from the load 1 side
When the load 1 is added, the load 1 and the second input unit 3 (FIGS.
6) cannot be separated. For example, electric assisted rotation
When moving the car backwards, start from the rear wheel 1 of the bicycle, which is the load 1.
The reduction gear 4 is configured via a chain and a crankshaft.
The outer ring 9 (FIG. 17) is turned clockwise in FIG.
In the opposite direction). In such a case,
The intermediate roller 12a is mounted on a narrow portion of the annular space 10.
It tends to be displaced and turns from the outer ring 9 to the center roller 7.
Transmits rolling force. As a result, the electric assist bicycle is retracted.
In this case, the electric motor constituting the second input unit 3 is rotated.
Must be turned, and the electric assist bicycle retracts accordingly.
The force required to do so increases. On the other hand, US Pat. No. 4,481,842 specification
Are transmitted through a friction roller type transmission.
A structure that cuts off the transmission of power when the torque exceeds a certain value
Is described. However, the structure described in this specification
In this case, if the torque is less than the above-mentioned fixed value,
Even if you don't want to do it, it will transmit power. Anti
On the other hand, if the torque is equal to or greater than the above
Even if you don't want to, the transmission of power is cut off. Therefore
It cannot be a means for solving the above problem. Book
In view of such circumstances, the friction roller type transmission of the present invention
Realizes a structure that allows you to arbitrarily select whether or not to transmit power
It was invented to do so. According to the present invention, there is provided a friction-roller-type transformer.
The transmission is the same as a conventionally known friction roller type transmission.
Like this, the first rotation axis and the end of this first rotation axis
The outer peripheral surface is fixed concentrically with the first rotation axis and the first cylindrical surface
The center roller and the inner peripheral surface as the second cylindrical surface
Around the center roller, relative rotation to this center roller
And one end of the outer ring concentric with the outer ring.
A second rotating shaft coupled and fixed to the outer ring, and the first cylindrical surface;
In the annular space between the first cylindrical surface and the second cylindrical surface.
A plurality of pivots arranged parallel to the rotation axis, and each of these pivots
It is rotatably supported by a shaft, and the outer peripheral surface of each is
And a plurality of intermediate rollers having a cylindrical surface. Soshi
The center of the first rotation axis, the second rotation axis,
By decentering the center of the ring, the width of the annular space
The law is uneven throughout the circumference. Also, the above plural
At least one of the intermediate rollers of
The annular space is supported so as to be slightly displaceable in the circumferential direction.
With the wedge roller,
The at least one intermediate roller of the annular space
Pressing means for elastically pressing toward narrow parts is provided.
ing. In particular, in the friction roller type transmission of the present invention,
The wedge roller, or an intermediate roller
Use a magnetic material or permanent magnet
Made of stone. And this magnetic material or permanent magnet
To the intermediate roller or to the pivot supporting this intermediate roller.
To support and fix the solenoid.
With the wedge roller based on energization or de-energization
To the wide part of the above annular space.
It is displaceable. The friction roller type transmission of the present invention constructed as described above.
In the case of a machine, the rotational driving force applied from the original input side
Only the intermediate roller that becomes the wedge roller when transmitting
Only when rotational driving force is input from the
It is elastically pressed toward the narrow part of the shape space. this
Therefore, when transmitting the rotational driving force applied from the original input side
To the outside, torque is transmitted between the center roller and the outer ring.
Will not be heard. 1 to 7 show an embodiment of the present invention.
1 shows a first example. Friction roller to which the present invention is applied
The transmission 17 is made of a non-magnetic material such as an aluminum alloy.
A housing 18 is provided. This housing 18
Is the rotational drive of the electric motor 19 constituting the second input unit.
The end of the shaft 20 is concentric with the rotary drive shaft 20 and
State covering the central roller 7 provided integrally with the rotary drive shaft 20
And fixed to a frame or the like (not shown). In addition, above
The rotation drive shaft 20 may be a first rotation shaft or a first rotation shaft described in claims.
Corresponds to the second rotation axis. The housing 18 has
A bottom cylindrical main body 21 and a base opening of the main body 21 are closed.
And a cover 22. The center roller 7 has a lid
22 through a through hole 23 provided substantially at the center of the housing 22.
Inserted into the ring 18. The inner peripheral surface of the through hole 23
Between the outer peripheral surface of the base roller 7 and the center end of the central roller 7.
4 are provided. Also, the center is located inside the housing 18.
Around the roller 7, three pivots 11a, 11b
Are arranged in parallel with the center roller 7, respectively.
That is, one end of each of these pivots 11a, 11b (FIGS. 1, 4)
Is supported on the lid 22 and at the other end.
(Left end in FIGS. 1 and 4) is supported by the connecting plate 25.
In addition, two of these three pivots 11a and 11b are pivotable.
Both ends of the shafts 11b, 11b are connected to the lid 22 and the connecting plate.
25 into the fitting holes 26, 26 provided in
It is fixed by inserting without it. Therefore, these
Two pivots 11b, 11b are
There is no displacement in the circumferential or diametric direction. On the other hand, the remaining one pivot 11a is
Both ends of the cover 22 and the connecting plate 25 are
A slight displacement of the jing 18 in the circumferential and diametric directions
We support now. For this purpose, the lid 22 and the connecting plate
25, a part matching the both ends of the pivot 11a
As shown in FIGS. 2 to 4, the outside of both ends of the pivot 11 a
A circle having an inner diameter larger than the diameter or the lid 22
And a support hole 27 in the form of a long hole in the circumferential direction of the connecting plate 25,
27 are formed in alignment with each other,
Both ends of the pivot 11a are loosely engaged with 7, 27.
You. Each of these pivots 11a, 11b is
The intermediate rollers 12a, 12b, 12c are rotatably supported.
I have A part of the connecting plate 25 is connected to the lid 2.
2 (the above intermediate rollers 12a, 12b, 12c
It is a part of the space on the side of the space where it was installed.
Projected at a position off the intermediate rollers 12a, 12b, 12c
Connected to the projection 28. Further, each of the above-mentioned components is provided inside the housing 18.
The part surrounding the inter-rollers 12a, 12b, 12c has a bottom
A cylindrical outer ring 9 is provided rotatably. This outer ring 9
Is a cylindrical portion 29 and one end of the cylindrical portion 29 (FIGS. 1 and 4).
(Left end) Disc portion 30 closing the opening. Circle of these
The inner peripheral surface of the cylindrical portion 29 is a smooth second cylindrical surface 8.
Each of the intermediate rollers 12a, 12b,
Abuts on third cylindrical surfaces 13, 13 provided on the outer peripheral surface of 12c
It is free. Also, the outer surface of the disk portion 30 (each of the above
The space between the intermediate rollers 12a, 12b and 12c is
On the opposite side, the left side of FIGS.
(The right ends of FIGS. 1 and 4) are fixedly connected. This output shaft
31 is the second rotation shaft or the first rotation described in the claims.
Corresponds to the axis. The output shaft 31 is connected to the housing
Second through hole provided at the center of the main body 21 constituting the
32, and protrudes out of the housing 18.
You. In addition, the outer peripheral surface of the portion near the base end of the output shaft 31 is
A bearing 33 is provided between the second through hole 32 and the inner peripheral surface thereof,
The outer ring 9 and the output shaft 31 are connected to the housing 18.
And rotatably supported. Each of the intermediate rollers 12a, 12b, 12c
Of the outer ring 9 and the outer peripheral surface of the center roller 7
It is in contact with the inner peripheral surface. Friction roller type transmission of the present invention
In the case of a machine, the conventional structure shown in FIGS.
As with the friction roller type transmission of
7 and the center of the output shaft 31 and the center of the outer ring 9 are eccentric.
I have. That is, as described above, the center roller 7 is inserted.
The through hole 23 is provided substantially at the center of the housing 18.
In contrast, a second through hole through which the output shaft 31 is inserted
32 is slightly off the center of the housing 18
Position. For this reason, the circumference of the housing 18 is
The wall thicknesses are uneven throughout the circumference. Also this
The output shaft 31 and the outer ring 9 supported inside the second through hole 32
And are concentric with each other. Therefore, the center roller 7 and the upper
The outer ring 9 and the output shaft 31 are connected to the c
It is the amount of deviation δ (Figs. 1, 4) from the center of the housing 18.
Are eccentric to each other. Then, the center roller 7
Each of the above-mentioned components exists between the outer peripheral surface and the inner peripheral surface of the outer ring 9.
Annular space in which the inter rollers 12a, 12b, 12c are provided
The width of 10 is changed by the circle corresponding to the amount of eccentricity of δ.
It is uneven in the circumferential direction. As described above, the width dimension of the annular space 10 is circular.
The intermediate rollers 12a,
The outer diameters of 12b and 12c are different. That is, outside the above
The side where the center roller 7 is eccentric with respect to the wheel 9 (see FIGS.
Diameter of two intermediate rollers 12a, 12b located on the lower side)
Are made the same as each other and have a relatively small diameter. This
On the other hand, the center roller 7 is eccentric with respect to the outer ring 9 and
On the opposite side (upper side of FIGS. 1, 2 and 4)
The diameter of the roller 12c is adjusted to the two intermediate rollers 12a, 1
2b is larger than the diameter. And these three
A third roller provided on the outer peripheral surface of the intermediate rollers 12a, 12b, 12c
The three cylindrical surfaces 13 and 13 are attached to the outer peripheral surface of the center roller 7.
The first cylindrical surface 6 provided and the second cylindrical surface provided on the inner peripheral surface of the outer ring 9 are provided.
It is in contact with the second cylindrical surface 8. The friction roller type
The gear ratio of the speed unit 17 is determined by the diameter of the first cylindrical surface 6 and the second
Is determined by the ratio of the diameter to the diameter of the cylindrical surface 8. Therefore, necessary
In order to obtain a reduction ratio, three
Outer sleeve and the outer peripheral surface of this sleeve
The outer peripheral surfaces of the rollers 12a, 12b and 12c
You can also. In this case, the first cylindrical surface is
It becomes the outer peripheral surface. Also, a relatively small diameter 2
Of the intermediate rollers 12a, 12b
The middle of one (right side in FIG. 2) rotatably supported around
Roller 12a can function freely as a wedge roller
I have. For this reason, in the case of this example, the intermediate roller 12a
Between the pivot 11a, which pivotally supports
As shown in 2, 4 and 5, a spring 14 as a pressing means is provided.
ing. This spring 14 is a compression coil spring.
The wedge roller is connected via a piece 34 and the pivot 11a.
12a toward the narrow portion of the annular space 10,
Sexually pressing. Further, the friction roller type transmission 17 of the present invention
In some cases, the intermediate row acts as the wedge roller.
The pivot 11a supporting the bearing 12a is made of a magnetic material such as steel.
It is composed of Then, it is held on a part of the lid 22.
The hole 35 is formed in the support hole 27 formed in the lid 22.
It opens on the wide side of the annular space 10 on the peripheral surface.
It is provided in a state. Then, the solenoid is inserted into the holding hole 35.
While holding the id 36, the tip of this solenoid 36
Surface (the lower left end surface in FIG. 3) is the outer peripheral surface of the end of the pivot 11a.
Facing. When energizing the solenoid 36,
Act between the solenoid 36 and the pivot 11a
The magnetic attraction force is larger than the elastic force of the spring 14. this
The spring 14 is connected to the connecting plate 25 by the solenoid
The door 36 is installed in the lid 22 while being aligned with each other.
And an intermediate roller pivotally supported by the pivot 11a.
The displacement direction of 12a can be freely selected. That is,
When the solenoid 36 is not energized, the pivot 11a and the
The intermediate roller 12a pivotally supported by the pivot 11a of the
Narrow portion of the annular space 10 based on the elasticity of
When the solenoid 36 is energized.
The above-mentioned pivot 11a and an intermediate part pivotally supported by this pivot 11a
The roller 12a is moved toward the wide portion of the annular space 10.
To be displaced. The friction roller type transmission 1 constructed as described above
If the transmission of rotational force is performed by using the wedge roller 7,
Intermediate roller 12a and guide roller
On the outer peripheral surface of the two intermediate rollers 12b and 12c
The third cylindrical surfaces 13, 13 provided and the center roller 7
First cylindrical surface 6 provided on outer peripheral surface and inner peripheral surface of outer ring 9
, The contact pressure with the second cylindrical surface 8 provided at the second position can be secured. Soshi
Through the three intermediate rollers 12a, 12b, and 12c.
Then, from the center roller 7 to the outer ring 9, it is efficiently rotated.
Rolling force can be transmitted. In this way, outside the center roller 7
The operation when transmitting the rotational driving force to the wheel 9 is described in FIG.
Is similar to that of the first example of the conventional structure shown in FIG.
A duplicate description will be omitted. Particularly, in the case of the friction roller type transmission of the present invention.
Is applied from the center roller 7 which is the original input side.
When transmitting the rotational driving force, the central roller 7
Acts as wedge roller only when force is applied
The intermediate roller 12a to be narrowed,
Press elastically toward the part. For example, in the case of this example,
The energization of the solenoid 36 is performed according to the flowchart of FIG.
The control is performed under the conditions shown in (1). First, the electric motor 19
And the rotational driving force generated by the electric motor 19
From the central roller 7 to the three intermediate rollers 12a, 1
When transmitting to the outer ring 9 via 2b and 12c,
The energization of the solenoid 36 is stopped. As a result,
Of the first example of the conventional structure shown in FIG.
And efficiently rotates from the center roller 7 to the outer ring 9.
Driving force can be transmitted. On the other hand, the electric motor 19 is energized.
Instead, it is necessary to extract the rotational driving force from the electric motor 19.
When unnecessary, the solenoid 36 is energized. So
The intermediate roller 12a through the pivot 11a.
Is, as shown in FIG. 7, a wide portion of the annular space 10.
Displace toward. As a result, the three intermediate rollers 1
3a provided on the outer peripheral surfaces of 2a, 12b, and 12c, respectively.
Provided on the cylindrical surfaces 13 and 13 and the outer peripheral surface of the center roller 7
A second cylindrical surface provided on the first cylindrical surface 6 and an inner peripheral surface of the outer ring 9.
The contact pressure with the cylindrical surface 8 is lost. In this state,
The rotation of the outer ring 9 is transmitted to the center roller 7.
And the presence of the electric motor 19 causes the outer ring 9 to rotate.
No longer resists rolling. Therefore, for example, electric
Work to retract the assist bicycle can be performed lightly.
You. FIG. 8 shows a second embodiment of the present invention.
An example is shown. The first example described above, as shown in FIG.
When power is supplied to the solenoid 36, the
The end face is brought into contact with the outer peripheral surface of the pivot 11a made of magnetic material.
On the other hand, in the case of this example, these two surfaces are mutually connected.
And kept separated. That is, in the case of this example,
When the solenoid 36 is energized, the pivot 11a is
4 when the suction is performed against the elasticity of
Before the tip surface of the shaft comes into contact with the outer peripheral surface of the pivot 11a.
So that the outer peripheral surface of the contact hole comes into contact with the inner peripheral surface of the support holes 27, 27.
are doing. With this configuration, the solenoid
When energization of the solenoid 36 is stopped,
It is easy to separate the outer peripheral surface of the pivot 11a from the outer peripheral surface.
The shaft 11a can be hardly magnetized. Other configurations and works
The usage is the same as in the case of the first example described above. Next, FIGS. 9 to 11 show an embodiment of the present invention.
3 shows a third example. This example is shown in FIG.
As in the second example of the conventional structure, the rotation of the rotational driving force to be transmitted
In order to ensure sufficient transmission efficiency regardless of the direction,
Each of the intermediate rollers 12a and 12b
The present invention is applied to a structure that functions as a
You. In order to apply the present invention to such a structure,
A pivot that pivotally supports the intermediate rollers 12a and 12b
11a, 11a elastic in opposite directions with respect to the circumferential direction
So that the springs 14 and 14
The solenoids 36a and 36b are provided. Each of these Soleno
The installation structure of the guides 36a and 36b is the first example described above or
This is the same as the case of the second example described above. The friction roller type variable roller of the present embodiment configured as described above
In the case of a high-speed gear, the two solenoids 36a and 36b
Energization is controlled under the conditions shown in the flowchart of FIG.
I do. First, the electric motor 1 that rotationally drives the center roller 7
9 (FIG. 1), and the electric motor 19
When transmitting the rolling drive force from the center roller 7 to the outer ring 9
Depends on the rotation direction (see arrows a and b in FIG. 10).
One solenoid 36a (or 36b) is energized and the other solenoid
Power supply to the solenoid 36b (36a) is stopped. This result
As a result, the same as the case of the second example of the conventional structure shown in FIG.
In this way, the center roller 7 and the outer ring 9
It can transmit rotational driving force. On the other hand, the electric motor 19 is energized.
Instead, it is necessary to extract the rotational driving force from the electric motor 19.
If not necessary, the solenoids 36a and 36b
Turn on electricity. And, via the two pivots 11a, 11a
The intermediate rollers 12a and 12b are set to a width
Displace away from each other toward a wide area. this
As a result, the outer circumferences of the three intermediate rollers 12a, 12b, 12c
A third cylindrical surface 13, 13 provided on each of the surfaces,
The first cylindrical surface 6 provided on the outer peripheral surface of the center roller 7 and the outer surface
The contact pressure with the second cylindrical surface 8 provided on the inner peripheral surface of the ring 9 is lost.
I do. In this state, the rotational movement of the outer ring 9 is the center of the rotation.
The electric motor 1 is no longer transmitted to the rollers 7.
9 does not become a resistance to the rotation of the outer ring 9
Become. FIG. 12 shows a second embodiment of the present invention.
Four examples are shown. In the case of this example, the elasticity of the spring 14
A solenoid 36 for displacing the pivot 11a against
Provided in parallel with the center roller 7 so as to penetrate the lid 22
It is provided in the holding hole 35a. The lid 22 is an electric motor.
Data 19 (FIG. 1), so that it is configured as described above.
By doing so, wiring to energize the solenoid 36
Out of the electric motor with a friction roller type transmission.
I can do it. Also, to the stator constituting the electric motor 19
And the energization control to the solenoid 36 are mutually controlled.
In the case of the structure shown in FIG. 12,
These stators and the solenoid 36 can be arranged close to each other.
Thus, the wiring for the above-described energization control can be simplified. Other
The configuration and operation are the same as, for example, the first example described above. In the case of each of the above examples, the solenoid
Intermediate functioning as a wedge roller based on the power supply to the
The rollers are linked via a pivot that supports this intermediate roller.
It is made to displace to the wide part of the shape space. However
However, in order to achieve the object of the present invention, on the contrary,
Acts as a wedge roller when the solenoid is de-energized.
The intermediate roller that has less elasticity than the suction force of the solenoid.
A wide portion of the annular space based on the elasticity of the spring
It can be displaced in minutes. In this case the above
Solenoid acts as the wedge roller.
Roller elastically toward the narrow part of the annular space
It constitutes a pressing means for pressing. Furthermore, the above wedge
The intermediate roller that functions as a roller is made of a magnetic material such as steel.
And provided so as to face the outer peripheral surface of the intermediate roller.
When the solenoid is energized, the intermediate roller
Like displacing into a wide (or narrow) part of the shape space
May be configured. With this configuration, the intermediate row
The ends of the pivot supporting the shaft are spring-loaded into this intermediate row.
To the narrow (or wide) part of the annular space.
It can be elastically pressed. Therefore, the axis and the intermediate row
Of the force acting on the ring in the circumferential direction of the annular space.
Better. Next, FIG. 13 shows a second embodiment of the present invention.
Five examples are shown. In this case, the wedge roller and
The end of the pivot 11a that supports the intermediate roller that functions as
A pair of holding holes 35 sandwiching the loosely engaged support holes 27
b, 35c are opposite to each other with respect to the circumferential direction of the annular space.
It is provided on the side. And, each of these holding holes 35b, 35
Arrange solenoids 36c and 36d in c respectively.
The tip surface of each of the solenoids 36c and 36d is
The end portion 11a is opposed to the outer peripheral surface. First to first mentioned above
Unlike the case of the four examples, the pivot 11a is narrowed in the annular space.
There is no spring provided for pressing to the other side. As described above, the pair of solenoids 36c, 36
d, in the case of this example, between the center roller 7 and the outer ring.
Depending on whether or not to transmit torque between
Power is supplied to the solenoid 36c (36d), and the other solenoid
The power supply to the switch 36d (36c) is stopped. That is,
When transmitting the rotational driving force from the roller 7 to the outer ring,
When the solenoid 36c (lower left in FIG. 13) is energized,
To the other (upper right in FIG. 13) solenoid 36d.
To stop. As a result, the pivot 11a and the pivot 11a
The intermediate roller pivotally supported by 11a has a width of the annular space.
Displaced into a narrow part. In this state, the structure of this example is as described above.
As in the case of the first example of the conventional structure shown in FIG.
The rotational driving force is efficiently transmitted from the center roller 7 to the outer ring.
Can be reached. That is, in the case of this example, the one solenoid
The upper roller 36c raises the intermediate roller serving as a wedge roller.
Pressing elastically toward the narrow part of the annular space
Functions as pressure means. On the other hand, from the center roller 7 to the outer ring
If there is no need to transmit rotational driving force to
The other solenoid 36d is energized and the other solenoid 36d is energized.
The energization of the solenoid 36c is stopped. And the above-mentioned pivot 1
1a and the intermediate roller pivotally supported by the pivot 11a
To the wide portion of the annular space. This
In the state described above, the rotation of the outer ring is
Is not transmitted, and is connected to the center roller 7.
The presence of the electric motor reduces the resistance to rotation of the outer ring.
Will not be. It should be noted that, as in the present embodiment, it functions as a wedge roller.
A pair of solenoids is provided for each pivot supporting the intermediate roller
The structure to be provided is, as in the third example described above, two intermediate rollers.
Applied to a structure that functions as a wedge roller
You can do it. Furthermore, it functions as a wedge roller.
The intermediate roller is made of a magnetic material such as steel.
A pair of solenoids provided opposite the outer peripheral surface of the roller
Based on the power supply control to the guide, this intermediate roller is
It may be configured to be displaced in the circumferential direction of the space. Next, FIG. 14 shows a second embodiment of the present invention.
Six examples are shown. In this case, the wedge roller and
The pivot 11a supporting the intermediate roller 12a functioning as
While magnetizing in the axial direction (left-right direction in FIG. 14),
The outer peripheral surface of one end (right end in FIG. 14) of this pivot 11a is
The front end face (lower end face in FIG. 14) of the solenoid 36 is opposed to
I have. Then, the direction of the current supply to the solenoid 36 is switched off.
Switching the tip surface between the S pole and the N pole based on the
I am here. Also in the case of this example, the pivot 11a is annularly empty.
No spring is provided to press the narrow part between them. still,
The solenoid 36 is set in an annular space with respect to the pivot 11a.
Provide on the side where the width of the gap is narrower or on the side where the width is wider
Is optional and can be designed according to the installation space.
Set forth in However, depending on which side it is installed, the center row
Depending on whether the torque is transmitted between
The directions of power supply to the solenoids 36 are opposite to each other. In the case of this example configured as described above, the center
Whether or not torque is transmitted between the roller and the outer ring
The direction of energization to the solenoid 36 is switched.
The magnetic pole on the end face of the solenoid 36 is switched. The following
In the description, the solenoid 36 is connected to the pivot 11a.
And provided on the side where the width of the annular space 10 is widened.
The case where one end of 1a is an S pole will be described. center
When transmitting the rotational driving force from the rollers to the outer ring,
The end face is magnetized to the S pole. As a result, the
Axis 11a and this axis
The intermediate roller 12a pivotally supported by the annular space 11a
It is displaced to a narrow portion of 10. The structure of this example in this state
Are the same as those in the first example of the conventional structure shown in FIG.
In this way, the center roller is
Power can be transmitted. That is, in the case of this example,
Solenoid 36 is an intermediate row that serves as a wedge roller.
The rubber 12a is elastically directed toward the narrow portion of the annular space.
It functions as a pressing means for pressing on the surface. On the other hand, from the center roller to the outer ring
If there is no need to transmit rotational driving force to the
The tip surface is magnetized to the N pole. And act between different poles
The pivot 11a and the pivot 1
The intermediate roller 12a, which is pivotally supported by 1a, is
Displace toward the wide part between them. In this state,
The rotation of the outer ring is not transmitted to the center roller.
It becomes. In the case of the structure of this example configured as described above,
By simply providing one solenoid without the spring,
A shaft 11a and the intermediate row pivotally supported by the shaft 11a;
Can be displaced in both circumferential directions of the annular space.
it can. Therefore, it can be configured to be relatively small and lightweight. Seo
The side where the width of the annular space 10 becomes narrower with respect to the pivot
Magnetizing the necessity of transmission of rotational driving force
The same operation and effect can be obtained except that the direction is reversed. In the above description, three pivots and an intermediate row are used.
Although the description mainly focuses on the case where three
If there are multiple shafts and multiple intermediate rollers,
A friction roller type transmission of a rubber type can be configured. That is,
The number of intermediate rollers may be two or four.
No. However, when two intermediate rollers are provided, these two
The intermediate rollers in the circumferential direction of the center roller.
On the side where the width of the annular space is slightly narrower than the radially opposite side
Place it near the part. Also, two wedge rollers are provided
In this case, three or more intermediate rollers are required. The friction roller type transmission according to the present invention has been described above.
Because it is configured and works as described, ensuring transmission efficiency and
Prevention of unnecessary resistance addition can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first example of an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a sectional view taken along the line BB in FIG. FIG. 4 is a sectional view taken along line CC of FIG. 2; FIG. 5 is an enlarged sectional view taken along the line DD. FIG. 6 is a flowchart showing a control state of a solenoid when the structure of the first example is used. FIG. 7 is a schematic EE cross-sectional view of FIG. FIG. 8 is a view similar to FIG. 5, showing a second example of the embodiment of the present invention. FIG. 9 is a view similar to FIG. 2, showing a third example of the embodiment of the present invention. FIG. 10 is a view similar to FIG. 3; FIG. 11 is a flowchart showing a control state of a solenoid when the structure of the third example is used. FIG. 12 is a view similar to FIG. 5, showing a fourth example of the embodiment of the present invention. FIG. 13 is a view similar to FIG. 3, showing the fifth example. FIG. 14 is a view similar to FIG. 5, showing the sixth example; FIG. 15 is a block diagram showing a normal operation state of the driving device with an auxiliary power mechanism. FIG. 16 is a block diagram showing an operation state of the driving device with the auxiliary power mechanism in a state where the driving speed of the first input unit is higher than that of the load. FIG. 17 is a schematic sectional view showing a first example of a conventional friction roller type transmission. FIG. 18 is a schematic sectional view showing the second example. [Description of Signs] 1 Load 2 First input unit 3 Second input unit 4 Reducer 5 Merging unit 6 First cylindrical surface 7 Center roller 8 Second cylindrical surface 9 Outer ring 10 Annular space 11a, 11b Axis 12a , 12b, 12c Intermediate roller 13 Third cylindrical surface 14 Spring 15 Inner diameter contact portion 16 Outer diameter contact portion 17 Friction roller type transmission 18 Housing 19 Electric motor 20 Rotary drive shaft 21 Main body 22 Lid 23 Through hole Reference numeral 24 Bearing 25 Connecting plate 26 Fitting hole 27 Supporting hole 28 Projecting portion 29 Cylindrical portion 30 Disk portion 31 Output shaft 32 Second through hole 33 Bearing 34 Pressing pieces 35, 35a, 35b, 35c Holding holes 36, 36a, 36b , 36c, 36d solenoid

────────────────────────────────────────────────── (5) References JP-A-59-50263 (JP, A) French Patent Application Publication 2542406 (FR, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) F16H 13/00-15/56

Claims (1)

(57) [Claims 1] A first rotating shaft and an end portion of the first rotating shaft which is fixed concentrically with the first rotating shaft and has an outer peripheral surface formed of a first cylinder. A central roller having an inner peripheral surface, an outer ring having an inner peripheral surface serving as a second cylindrical surface around the central roller and freely rotatable relative to the central roller, and one end connected to the outer ring concentrically with the outer ring. A fixed second rotation axis, a plurality of pivots arranged in parallel with the first rotation axis in an annular space between the first cylindrical surface and the second cylindrical surface, A plurality of intermediate rollers rotatably supported by the respective pivots, each having an outer peripheral surface as a third cylindrical surface,
By decentering the center of the first rotation shaft and the centers of the second rotation shaft and the outer ring, the width of the annular space is made uneven in the circumferential direction, and the width of the plurality of intermediate rollers is reduced. At least one of the intermediate rollers is supported so as to be slightly displaceable in the circumferential direction of the annular space to form a wedge roller, and the at least one intermediate roller serving as the wedge roller is connected to the annular space. In a friction roller type transmission provided with a pressing means for elastically pressing toward a narrow portion, an intermediate roller serving as the wedge roller or a pivot supporting the intermediate roller is made of a magnetic material or a permanent magnet. At the same time, the solenoid is supported and fixed opposite to the intermediate roller made of the magnetic material or the permanent magnet or the pivot supporting the intermediate roller. An intermediate roller to be the wedge roller on the basis of the energization stop, a friction roller type transmission, characterized in that is freely displaced toward the wide portion of the annular space.