JP2001234999A - Axial force generating device and traction transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable axial force generating device by a simple constitution and to provide a traction transmission using it. SOLUTION: This axial force generating mechanism 10 comprises a centrifugal force generating mechanism, a converting mechanism converting the centrifugal force into the axial force, etc. The centrifugal force generating mechanism comprises a weight 11 rotating from a rotation center at a prescribed rotation radius. The converting mechanism comprises an operating member 14 fixed to an input shaft 2, a reference member 15 rotating with the input shaft 2 and displaceably supported along the input shaft 2, a positioning mechanism 20 regulating the position of the reference member 15, an arm 12 connecting the operating member 14 to the weight 11 by a pin connection, an arm 13 connecting the reference member 15 to the weight 11 by the pin connection, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial force generator for generating an axial force by utilizing a centrifugal force caused by a rotational motion, and a traction transmission using the same.

[0002]

2. Description of the Related Art A general traction transmission mechanism includes an input disk rotating in conjunction with an input shaft, an output disk rotating in conjunction with an output shaft, a transmission roller interposed between the input disk and the output disk, and It is composed of an axial force generating mechanism for generating a pressing force of the transmission roller. The transmission roller is supported by a support member called a trunnion to allow rotation about the roller axis and to be tiltable in a plane including the roller axis and the disk rotation axis.

[0003]

As an axial force generating mechanism of such a traction transmission mechanism, a roller is interposed between two rotating cams, and the axial force is controlled in accordance with a change in the distance between the cam surfaces by controlling the rotating torque. In general, a rotating cam system is used (for example, Japanese Patent Application Laid-Open No. H10-2671).
No. 01). In the case of this method, there is a problem that when the rotational torque is small, the pressing force becomes small and a slip occurs between the transmission roller and the disk.

In addition, the present applicant has proposed a direct pulling system in which an actuator for directly pulling the trunnion to the disk side is provided without using a rotating cam to generate a pressing force of a transmission roller (Japanese Patent No. 2972688
issue).

An object of the present invention is to propose another system, and to provide a highly reliable axial force generator with a simple structure and a traction transmission using the same.

[0006]

According to the present invention, there is provided a centrifugal force generating mechanism which rotates with a rotating shaft to generate a centrifugal force, and converts the centrifugal force generated by the centrifugal force generating mechanism into an axial force along the rotating axis. An axial force generator comprising a conversion mechanism.

[0007] According to the present invention, by utilizing the centrifugal force associated with the rotational movement, it is not necessary to prepare a special drive source, so that the configuration can be simplified. Also, the centrifugal force Fc
Is Fc = mr using mass m, radius of gyration r, and angular velocity ω.
Since it is represented by ω ^ 2, the magnitude of the centrifugal force can be adjusted in a wide range and the axial force can be adjusted in a wide range by changing the rotation radius r and the angular velocity ω.

Further, according to the present invention, the centrifugal force generating mechanism has a weight that rotates with a predetermined radius of rotation from the center of rotation, and the conversion mechanism includes a first arm connecting the rotary shaft and the weight, It is characterized by having a second arm connecting the weight and the reference member whose displacement is regulated.

According to the present invention, a large centrifugal force can be generated by the rotational movement of the weight. In addition, when the centrifugal force is generated in the weight by connecting and supporting the weight with the two arms, the first arm presses the rotation shaft toward the reference member. As a result, the centrifugal force can be efficiently converted to the axial force with a simple mechanism.

Further, the present invention is characterized in that a centrifugal force adjusting mechanism for adjusting the rotation radius of the weight by adjusting the regulation position of the reference member along the rotation axis direction is provided.

According to the present invention, by adjusting the regulation position of the reference member along the direction of the rotation axis, the rotation radius of the weight can be adjusted, and accordingly, the magnitude of the centrifugal force also becomes variable. As a result, the magnitude of the axial force can be arbitrarily adjusted even when the rotation speed ω of the rotating shaft is constant.

Further, according to the present invention, the centrifugal force generating mechanism has a fluid sealed in a hollow portion, the conversion mechanism holds the fluid,
It is characterized by having a pressure receiving member that can be displaced along the rotation axis direction according to the fluid pressure.

According to the present invention, a large centrifugal force can be generated by the rotational movement of the sealed fluid. A liquid having a large specific gravity is preferable as the fluid generating the centrifugal force, and examples thereof include oil, water, and mercury. Further, by providing a pressure receiving member displaceable along the rotation axis direction, when a centrifugal force is generated in the fluid, the pressure reception member generates a pressing force along the rotation axis direction according to the fluid pressure. As a result, the centrifugal force can be efficiently converted to the axial force with a simple mechanism.

Further, the present invention is characterized in that it has a fluid replenishment passage including a communication hole formed in the rotating shaft and a communication passage communicating the communication hole with the hollow portion.

According to the present invention, by providing a fluid replenishment passage for replenishing the sealed fluid, the fluid leaked from the hollow portion can be circulated and reused. Therefore, it is possible to eliminate the mechanical difficulty of completely enclosing the fluid on which a large centrifugal force acts.

Further, the present invention is characterized by including a relief valve for adjusting the pressure of the sealed fluid.

According to the present invention, the pressure acting on the pressure receiving member can be adjusted by providing the relief valve for controlling the leakage flow rate of the sealed fluid and adjusting the pressure of the sealed fluid. As a result, the magnitude of the axial force can be arbitrarily adjusted even when the rotation speed ω of the rotating shaft is constant.

The present invention also provides an input shaft rotated by an external drive source, an input disk interlocked with the input shaft, an output disk interlocked with the output shaft, and a transmission roller interposed between the input disk and the output disk. And a shaft force generating mechanism provided on at least one of the input shaft and the output shaft for generating a pressing force of the transmission roller.

According to the present invention, the structure of the axial force generating mechanism can be simplified, and the magnitude of the axial force can be adjusted in a wide range. Therefore, a highly reliable continuously variable transmission with a simple structure can be realized. .

[0020]

FIG. 1A is a configuration diagram showing a first embodiment of the present invention. The traction transmission 1 is
An input shaft 2 that is rotated by an external drive source such as an engine or a motor, and an input disk 3 that rotates in conjunction with the input shaft 2
An output disk 6 that rotates in conjunction with the output shaft 7, a transmission roller 4 interposed between the input disk 3 and the output disk 6, an axial force generating mechanism 10 for generating a pressing force of the transmission roller 4, and the like. It consists of.

The transmission roller 4 is supported by a support member 5 called a trunnion to allow rotation about the roller axis and to be tiltable in a plane including the roller axis and the disk rotation axis.

The distance measured from the disk rotation axis at the position where the transmission roller 4 contacts the input disk 3 is defined as the input contact radius Ri, and the position where the transmission roller 4 contacts the output disk 6 is measured from the disk rotation axis. The distance is the contact radius Ro on the output side, the rotation speed of the input shaft 2 and the input disk 3 is Ni, and the rotation speed of the output shaft 7 and the output disk 6 is N
If o, the relationship of speed ratio No / Ni = Ri / Ro is established. Thus, by controlling the tilt angle of the transmission roller 4, each of the contact radii Ri and Ro changes continuously, so that the speed ratio No / Ni can be changed continuously.

The axial force generating mechanism 10 rotates together with the input shaft 2 to generate a centrifugal force, and converts the centrifugal force generated by the centrifugal force generating mechanism into an axial force along the input shaft 2. It is composed of a mechanism.

The centrifugal force generating mechanism is composed of a weight 11 that rotates at a predetermined radius of rotation from the center of rotation.
Using the turning radius r and the angular velocity ω, the centrifugal force Fc = mr
Generates ω ^ 2.

The conversion mechanism includes an operating member 14 fixed to the input shaft 2, a reference member 15 that rotates together with the input shaft 2 and is displaceably supported along the input shaft 2, and regulates the position of the reference member 15. A positioning mechanism 20, an arm 12 for connecting the operating member 14 and the weight 11 by a pin connection, and a reference member 1
It is composed of an arm 13 and the like connecting the weight 5 and the weight 11 by pin connection.

FIG. 1B is an arrangement view of the axial force generating mechanism 10 as viewed from the front end side of the input shaft 2. A plurality of weights 11 (here, four) are arranged axially symmetrically around the input shaft 2, and each weight 1
Arms 12 and 13 supporting the first member 1 are connected to the operating member 14 and the reference member 15 in an axisymmetric manner.

The operating member 14 is applied with a preload (preload) by the disc spring 8 to generate a constant axial force.
By pressing the input shaft 2 toward the output disk 6,
The pressing force of the transmission roller 4 in the rotation stopped state is secured. A spline bearing 16 is interposed between the reference member 15 and the operating member 14, allowing axial displacement between the two and integrating the rotational movements of the two. This spline bearing may be arranged between the reference member 15 and the input shaft 2.

Next, the operation of the axial force generating mechanism 10 will be described.
When the input shaft 2 rotates at the angular velocity ω, the weight 11 also moves to the arm 1
The centrifugal force Fc is generated in each weight 11 by rotating with the rotation radius r determined by the support angles 2 and 13. Centrifugal force Fc is arm 1
2 and 13 and the force Fa transmitted to the arm 13 is rigidly supported by the reference member 15, while the force Fa is transmitted to the arm 12.
Is transmitted to the input shaft 2 of the operating member 14.
, And a force Fr in the radial direction of the input shaft 2. When the support angle of the arm 12 is θ, the force Fp = F
b · cos θ is established, and this corresponds to the axial force generated by the operating member 14. The radial force Fr includes four arms 1
2 are offset symmetrically because they are connected axisymmetrically.

The axial force Fp thus generated depends on the pressing force between the transmission roller 4 and the input disk 3 and the transmission roller 4
And the output disk 6 acts as a pressing force.

The centrifugal force Fc is the mass m of the weight 11 and the radius of gyration r.
And the angular velocity ω, the magnitude of the axial force Fp can be changed by changing any of the parameters.

Therefore, by adjusting the axial position of the reference member 15 by the positioning mechanism 20, the arm 1 is moved.
Since the rotation angle r of the weight 11 changes as the supporting angles of the weights 2 and 13 change, the centrifugal force Fc and the axial force Fp can be arbitrarily adjusted.

FIG. 1C is a graph showing the relationship between the axial force Fp and the turning radius r of the weight 11. Since the axial force Fp is proportional to the turning radius r, the magnitude of the axial force Fp can be arbitrarily adjusted by adjusting the turning radius r. Note that F1 in the graph corresponds to the preload of the disc spring 8, and when the operating member 14 is displaced toward the input disk 3 and the axial force Fp of the operating member 14 exceeds the preload F1, the disc spring 8 is activated. No longer.

Further, by changing the rotation speed of the external drive source, the angular velocity ω of the input shaft 2 also changes, so that the centrifugal force Fc and the axial force Fp can be arbitrarily adjusted.

FIG. 1D is a graph showing the relationship between the axial force Fp and the angular velocity ω of the input shaft 2. The axial force Fp is the angular velocity ω
, The magnitude of the axial force Fp can be arbitrarily adjusted by adjusting the angular velocity ω. F1 in the graph
Similarly corresponds to the preload of the disc spring 8.

By applying such a variable axial force generating mechanism 10 to the traction transmission 1, when the transmission torque in the traction transmission 1 is large, the pressing force of the transmission roller 4 can be increased. It is possible to reliably prevent the transmission roller 4 from slipping. In particular, when the rotation speed is very high, the slip on the contact surface (traction surface) between the disk and the transmission roller increases, and the risk of slipping increases. However, if an axial force generating mechanism using centrifugal force is used, axial force control according to the rotation speed (angular velocity) can be easily performed, and slip at high speed can be prevented. Further, when the transmission torque in the traction transmission 1 is small, by reducing the pressing force of the transmission roller 4, it is possible to prevent excessive stress from being applied to the transmission roller 4, the input disk 3, the output disk 6, and the like. The life and reliability of members can be greatly improved.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention. Here, a configuration example of the positioning mechanism 20 will be described.

A spline bearing 16 is interposed between the reference member 15 and the input shaft 2, allowing axial displacement between the two and integrating the rotational movements of the two. A hollow ball screw 21 is disposed outside the reference member 15. Angular bearing 22 between reference member 15 and ball screw 21
Is mounted, the axial displacement between the two is transmitted, and the rotational movement between the two is separated. A nut 24 is screwed to the outside of the ball screw 21 via a ball row 23. Here, the nut 24 is fixed to a housing or the like.
Moves linearly.

The teeth formed on the outer periphery of the ball screw 21 mesh with the gear 25, and the gear 25 meshes with the gear 26,
The gear 26 is a rotation angle control type motor 2 such as a step motor.
7 is driven to rotate.

Next, the operation will be described. By forward or reverse rotation of the motor 27, the ball screw 21 also rotates forward or backward, displaces back and forth with respect to the fixed nut 24, and the reference member 15 moves along the input shaft 2 to the operating member 14 or the input disk. Displaced toward 3. When the reference member 15 is positioned on the operation member 14 side, the arms 12 and 13
Is increased, the radius of rotation r of the weight 11 is increased, and the centrifugal force Fc and the axial force Fp are increased.

On the other hand, when the reference member 15 is positioned on the input disk 3 side, the support angles of the arms 12 and 13 become small, the turning radius r of the weight 11 becomes short, and the centrifugal force Fc
And the axial force Fp decreases.

Although the configuration using the ball screw 21 as the positioning mechanism 20 has been described above, another linear actuator may be used.

FIG. 3 is a block diagram showing a third embodiment of the present invention. The traction transmission 1 is, like FIG.
An input shaft 2 that is rotated by an external drive source such as an engine or a motor, and an input disk 3 that rotates in conjunction with the input shaft 2
And an output disk that rotates in conjunction with the output shaft, a transmission roller 4 interposed between the input disk 3 and the output disk, an axial force generating mechanism 10 for generating a pressing force of the transmission roller 4, and the like. 3, the output shaft and the output disk are not shown.

The axial force generating mechanism 10 rotates together with the input shaft 2 to generate a centrifugal force, and converts the centrifugal force generated by the centrifugal force generating mechanism into an axial force along the input shaft 2. It is composed of a mechanism.

The centrifugal force generating mechanism has a fluid Q sealed in a hollow portion 32 sandwiched between the rear surface of the input disk 3 and the cylinder disk 30. Using the mass m, the radius of gyration r and the angular velocity ω, the centrifugal force Fc = m
Since rω ^ 2 is generated, a larger centrifugal force Fc is distributed as the distance from the input shaft 2 increases.

The conversion mechanism is a cylinder disk 3 having two large and small cylindrical portions extending in the axial direction from the dish-shaped disk.
0, and an input disk 3 that slides on the inner surface of the outer cylindrical portion and the inner cylindrical portion. The cylinder disk 30 is fixed to the input shaft 2.

A spline bearing 41 is interposed between the input disk 3 and the input shaft 2. The input disk 3 is allowed to be displaced in the axial direction, and can be displaced according to the pressure of the fluid Q sealed in the hollow portion 32. Function as a simple pressure receiving piston. A seal member 40 for preventing leakage of the fluid Q is provided on a sliding surface between the cylinder disk 30 and the input disk 3 and a gap between the input disk 3 and the input shaft 2.

A preload (preload) is applied to the input disk 3 by the disc spring 8 to generate a constant axial force.
By pressing the input disk 3 toward the transmission roller 4, the pressing force of the transmission roller 4 in the rotation stopped state is secured.

The input shaft 2 has a communication hole 2a through which the fluid Q passes.
Are formed, and communication passages 2b and 30a for communicating the communication hole 2a and the hollow portion 32 at the mounting position of the cylinder disk 30 are formed.
2 is secured. When the fluid Q can be used as lubricating oil, it is also supplied to the spline bearing 41 and other traction transmission members through the communication hole 2c of the input shaft 2.

The outer cylindrical portion of the cylinder disk 30
A communication hole 30b through which the fluid Q passes is formed, and a relief valve 31 for adjusting the pressure of the sealed fluid Q is provided at an outlet of the communication hole 30b.

The fluid Q leaked from the relief valve 31 and other members is collected in the fluid receiver 45. The collected fluid Q passes through a filter 46 for removing foreign matter, and
Then, the pressure is supplied to the communication hole 2 a again, and the pressure is supplied to the hollow portion 32. The pressure of the pump 47 is equal to the fluid Q
It is enough to circulate.

Next, the operation of the axial force generating mechanism 10 will be described.
When the input shaft 2 rotates at an angular velocity ω, the cylinder disk 3
0 and the input disk 3 also rotate, and a pressure corresponding to the distribution of the centrifugal force Fc is generated in the fluid Q sealed in the hollow portion 32. The pressure of the fluid Q presses the back surface of the input disk 3 which is a pressure receiving piston, and the input disk 3
An axial force is generated to displace the side.

The axial force thus generated acts as a pressing force between the transmission roller 4 and the input disk 3 and a pressing force between the transmission roller 4 and the output disk.

Since the centrifugal force Fc is a function of the mass m, the radius of gyration r and the angular velocity ω, the magnitude of the axial force can be changed by changing any of the parameters.

Here, the pressure acting on the input disk 3 can be adjusted by controlling the leakage flow rate of the fluid Q by adjusting the opening of the relief valve 31 and adjusting the pressure of the sealed fluid Q. As a result, the magnitude of the axial force can be arbitrarily adjusted even if the angular velocity ω of the rotating shaft is constant.

The configuration in which the input disk 3 also serves as a pressure receiving member has been described above. However, a configuration in which a pressure receiving member is provided separately from the input disk 3 and both are connected may be used. Also,
Although the hollow portion 32 has been described as an example of the tapered cross-sectional shape in which the interval becomes narrower as the distance from the input shaft 2 increases, other shapes may be used.

FIGS. 4A, 4B and 4C are partial cross-sectional views showing another example of the structure of the axial force generating mechanism 10. FIG. FIG.
(A), the cylinder disk 30 and the pressure receiving disk 35
The hollow part 32 whose distance between them is constant irrespective of the turning radius
Here is an example. FIG. 4B shows an example of the hollow portion 32 in which the distance between the cylinder disk 30 and the pressure receiving disk 35 increases as the distance from the input shaft 2 increases. The pressure receiving disk 35 generates an axial force due to the centrifugal force Fc of the fluid Q sealed in the hollow portion 32. In FIG. 4C, an elastomer 39 instead of the seal member 40 is bonded to the cylinder disk 30 and the pressure receiving disk 35, and the relative displacement between the two disks is absorbed by the elastic deformation of the elastomer 39.

FIGS. 5 to 7 are block diagrams showing the axial force control system of the traction transmission 1. FIG. FIG. 5 shows an example in which the above-described axial force generating mechanism 10 is provided on the input shaft 2 of the traction transmission 1.

The driving torque of the external engine 50 is transmitted to the input shaft 2, and is continuously variable by a traction transmission mechanism constituted by the input disk 3, the transmission roller 4, the output disk 6 and the like, and is taken out from the output shaft 7. .

A torque sensor 51 is attached to the input shaft 2 and outputs a torque signal S corresponding to the torque acting on the input shaft 2.
Output t. The transmission roller 4 is provided with a tilt angle sensor 52 for detecting the tilt angle of the transmission roller 4 and outputs a tilt angle signal Sα. Since the inclination angle of the transmission roller 4 reflects the input contact radius Ri of the input disk 3 and the output contact radius Ro of the output disk 6, the gear ratio of the traction transmission mechanism can be indirectly measured by the inclination angle sensor 52.

The control unit 53 determines the magnitude of the current driving torque from the torque signal St, determines the gear ratio of the traction transmission mechanism from the inclination angle signal Sα, and determines the axial force control signal S
p is output to the axial force generating mechanism 10 to generate a necessary and sufficient axial force so as not to cause excessive stress while preventing the transmission roller 4 from slipping. Further, if a rotation speed sensor is attached to the input shaft 2 and a rotation speed signal is input to the control unit 53, it is possible to generate a necessary and sufficient axial force in consideration of the driving rotation speed.

FIG. 6 shows an example in which the above-described axial force generating mechanism 10 is provided on the output shaft 7 of the traction transmission 1. Since the axial force generating mechanism 10 generates the axial force using the centrifugal force, the axial force generating mechanism 10 can be provided on the output shaft 7 that is a rotating shaft to generate the pressing force of the transmission roller 4.

The control section 53 outputs the axial force control signal Sp to the axial force generating mechanism 10 based on the torque signal St from the torque sensor 51 and the tilt angle signal Sα from the tilt angle sensor 52.
To generate a necessary and sufficient axial force so as not to cause excessive stress while preventing the transmission roller 4 from slipping.

FIG. 7 shows an example in which the above-described axial force generating mechanism 10 is provided on both the input shaft 2 and the output shaft 7 of the traction transmission 1. Since the axial force generating mechanism 10 generates the axial force by using the centrifugal force, the axial force generating mechanism 10 is provided on the input shaft 2 and the output shaft 7 which are the rotating shafts. Can also be generated.

The control unit 53 outputs an axial force control signal Sp to both the axial force generating mechanisms 10 based on the torque signal St from the torque sensor 51 and the inclination angle signal Sα from the inclination angle sensor 52 to transmit power. A necessary and sufficient axial force is generated so as not to cause an excessive stress while preventing the roller 4 from slipping.

[0065]

As described in detail above, according to the present invention, the use of the centrifugal force associated with the rotational movement eliminates the need for preparing a special drive source, thereby simplifying the configuration. Since the centrifugal force Fc is expressed by Fc = mrω ^ 2 using the mass m, the turning radius r, and the angular velocity ω, the magnitude of the centrifugal force can be adjusted in a wide range by changing the turning radius r and the angular velocity ω. It is possible to adjust the axial force in a wide range.

The centrifugal force generated by the weight is supported by connecting the weight with the two arms, so that when the centrifugal force is generated in the weight, the first arm presses the rotating shaft toward the reference member. Can be converted to force.

Further, the magnitude of the axial force can be arbitrarily adjusted by adjusting the regulating position of the reference member along the rotation axis direction.

Further, since a large centrifugal force is generated by the rotational motion of the sealed fluid, and the pressure receiving member generates a pressing force along the direction of the rotation axis according to the fluid pressure, the centrifugal force is efficiently generated by a simple mechanism. Can be converted to force.

When the centrifugal force type axial force generating mechanism is used, the pressing force increases as the number of rotations increases as long as the rotation radius is not changed, which is very effective in preventing slip during high-speed rotation. Further, by performing control based on the torque, the number of revolutions, and the tilt angle, it is possible to always adjust to the optimal axial force, thereby preventing slip at a large torque and extending the life of the device.

[Brief description of the drawings]

FIG. 1A is a configuration diagram showing a first embodiment of the present invention, FIG. 1B is a layout view of an axial force generating mechanism 10 viewed from the tip end side of an input shaft 2, and FIG. ) Is a graph showing the relationship between the axial force Fp and the turning radius r of the weight 11, and FIG. 1D is a graph showing the relationship between the axial force Fp and the angular velocity ω of the input shaft 2.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIGS. 4A, 4B, and 4C are partial cross-sectional views illustrating another configuration example of the axial force generation mechanism 10. FIGS.

FIG. 5 is a block diagram showing an axial force control system of the traction transmission 1.

6 is a block diagram showing an axial force control system of the traction transmission 1. FIG.

FIG. 7 is a block diagram showing an axial force control system of the traction transmission 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traction transmission 2 Input shaft 3 Input disk 4 Transmission roller 5 Support member 6 Output disk 7 Output shaft 8 Disc spring 10 Axial force generating mechanism 11 Weight 12, 13 Arm 14 Operating member 15 Reference member 20 Positioning mechanism 21 Ball screw 24 Nut Reference Signs List 30 Cylinder disk 31 Relief valve 32 Hollow part 45 Fluid receiver 51 Torque sensor 52 Inclination angle sensor 53 Control unit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Koji Kawakami 2 Kawasaki-cho, Kakamigahara-shi, Gifu F-term in Commuter Helicopter Advanced Technology Research Institute Co., Ltd. (Reference) 3J051 AA03 BA03 BD02 BE09 CA05 CB07 DA02 EA07 EB03

Claims (7)

[Claims] 1. A centrifugal force generating mechanism that rotates together with a rotation shaft to generate a centrifugal force, and a conversion mechanism that converts the centrifugal force generated by the centrifugal force into an axial force along the rotation axis. Axial force generator. 2. The centrifugal force generating mechanism has a weight that rotates with a predetermined radius of rotation from a center of rotation, and the conversion mechanism has a first arm that connects the rotary shaft and the weight, and a displacement in the direction of the rotary axis is restricted. 2. The axial force generator according to claim 1, further comprising a second arm connecting the reference member and the weight. 3. The axial force generating device according to claim 2, further comprising a centrifugal force adjusting mechanism for adjusting a regulating position of the reference member along a rotation axis direction to adjust a rotation radius of the weight. . 4. The centrifugal force generating mechanism has a fluid sealed in a hollow portion, and the conversion mechanism has a pressure receiving member that holds the fluid and is displaceable along a rotation axis direction according to the fluid pressure. The axial force generator according to claim 1, wherein: 5. The axial force generating device according to claim 4, further comprising a fluid replenishing passage including a communication hole formed in the rotating shaft and a communication passage communicating the communication hole with the hollow portion. 6. The axial force generator according to claim 5, further comprising a relief valve for adjusting a pressure of the sealed fluid. 7. An input shaft rotated by an external drive source, an input disk interlocked with the input shaft, an output disk interlocked with the output shaft, a transmission roller interposed between the input disk and the output disk, and an input shaft. And a shaft force generating mechanism according to any one of claims 1 to 6, provided on at least one of the output shaft and the output shaft, for generating a pressing force of the transmission roller.