JP2001355699A - Continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuously variable transmission capable of flexibly setting a relative positional relation of an input shaft and an output shaft to a positional relation having linearity, a right angle or other angles and continuously varying and controlling a speed reduction ratio between the input shaft and the output shaft. SOLUTION: The device has the input shaft 2 and the output shaft 3, an input cone 4 and an output cone 5 provided on each of the input shaft 2 and the output shaft 3 and a power transmission wheel 7 arranged so as to be abutted on conical surfaces 9 and 10 of both of the cones 4 and 5 and provided rotatably around a shaft center of a support shaft 6. The support shaft 6 of the power transmission wheel 7 is tiltable to a prescribed angle in a plane including shaft centers of the input shaft 2 and the output shaft 3 and the conical surfaces 9 and 10 of both of the cones 4 and 5 abutting on the power transmission wheel 7 are formed into recessed curved surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission, and more particularly to a technique for performing variable flow control in a blower, a pump, and the like of an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a blower and a pump of an air conditioner are driven by a motor. The rated rotation speed of this motor is defined by the power supply frequency and the number of poles, and is generally calculated by the following equation. Motor rotation speed (rpm) = power supply frequency (Hz) x 1
20 / number of poles of motor × (1−slip ratio) Since the slip ratio is generally 3%, for example, when a motor having 4 poles is driven at a power supply frequency of 50 (Hz), 1455
(Rpm).

For this reason, when variably controlling the flow rate in a blower or a pump, the rotation speed of the motor is controlled by changing and adjusting the power supply frequency with an inverter.

[0004]

However, when the motor is controlled by an inverter, there is a possibility that high-frequency leakage current or electric noise (electromagnetic waves) may be generated, which may adversely affect surrounding electronic devices.

In general, there is a continuously variable transmission as a means for reducing the rotation speed of a motor and transmitting it to equipment, and various types of transmissions are known, but the relative positional relationship between an input shaft and an output shaft is not known. There were structurally limited problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a linear positional relationship between an input shaft and an output shaft.
It is an object of the present invention to provide a continuously variable transmission that can be flexibly set to a positional relationship having a right angle or another angle and that can continuously variably control a reduction ratio between an input shaft and an output shaft. And

[0007]

In order to solve the above-mentioned problems, a continuously variable transmission according to the present invention comprises an input shaft and an output shaft, and an input shaft provided on each of the input shaft and the output shaft. A power transmission wheel that is disposed in contact with the conical surfaces of both cones and an output cone and that is rotatably provided around the axis of the support shaft, wherein the support shaft of the power transmission wheel has an input shaft and an output shaft. And the cones of both cones abutting on the power transmission wheel form a concave curved surface.

[0008] With the above configuration, the torque of the input shaft is transmitted to the power transmission wheel via the input cone, and the power transmission wheel transmits the torque to the output shaft via the output cone. At this time, the rotation speed of the power transmission wheel changes according to the contact position of the power transmission wheel with respect to the conical surface of the input cone, and the rotational speed becomes slower as the contact position is closer to the small diameter side of the input cone. The rotation speed becomes faster as is closer to the large diameter side of the input cone. The rotation speed of the output shaft changes depending on the contact position of the power transmission wheel with respect to the conical surface of the output cone. The closer the contact position is to the smaller diameter side of the output cone, the faster the rotation speed is. The rotation speed decreases as the diameter increases.

On the other hand, the power transmission wheel is tilted on a plane including the axis of the input shaft and the output shaft, so that the power transmission wheel always abuts on the conical surface of the cone, which is a concave curved surface of both cones. Changes, the contact position with respect to the input cone moves to the small diameter side, the contact position with respect to the output cone moves to the large diameter side, and as the contact position with respect to the input cone moves to the large diameter side, the output increases. The contact position with respect to the cone moves to the smaller diameter side. Therefore, by adjusting the tilt angle of the power transmission wheel, the rotation speed transmitted from the input shaft to the output shaft can be increased or decreased.

According to a second aspect of the present invention, there is provided a continuously variable transmission.
The input shaft, the output shaft, and at least one intermediate shaft; the input cone, the output cone, and the intermediate cone provided on each axis of the input shaft, the output shaft, and the intermediate shaft; and the conical surface of both the input cone and the intermediate cone. The first-stage power transmission wheel, which is disposed in contact with and is rotatably provided around the axis of the support shaft, and is disposed in contact with the conical surfaces of the cones of both the intermediate cone and the input cone, and is provided around the axis of the support shaft. And a second-stage power transmission wheel rotatably provided on the first stage. The support shaft of the first-stage power transmission wheel can be tilted at a predetermined angle on a plane including the axis of the input shaft and the intermediate shaft. The support shaft of the stage power transmission wheel can be tilted at a predetermined angle on a plane including the axis of the intermediate shaft and the output shaft, and the conical surface of each cone abutting on the first and second stage power transmission wheels has a concave curved surface. It is what makes.

With the above configuration, the torque of the input shaft is transmitted to the first power transmission wheel via the input cone, and the first-stage power transmission wheel transmits the torque to the intermediate cone, and the torque of the intermediate cone is transmitted to the second power transmission wheel. The stepped power transmission wheels transmit torque to the output shaft via the output cone.

Therefore, by adjusting the tilt angles of the first and second stage power transmission wheels and combining the respective tilt angles, the rotational speed transmitted from the input shaft to the output shaft can be increased or decreased at an arbitrary rate. it can.

According to a third aspect of the present invention, there is provided a continuously variable transmission.
At least one of the cones has a shape having a diameter different from that of the other cones. With the above-described configuration, the rate of change varies depending on the ratio of the diameters of both cones, and the maximum diameter on the large diameter side of the input cone is larger than the minimum diameter on the small diameter side of the output cone, and the minimum diameter on the small diameter side of the input cone is If the output cone is smaller than the maximum diameter on the large diameter side, there is a state in which the input shaft and the output shaft have the same speed during the tilting of the power transmission wheel. Area exists.

If the minimum diameter on the small diameter side of the input cone is equal to or larger than the maximum diameter on the large diameter side of the output cone,
During the tilting of the power transmission wheels, the output shaft always rotates at an increased speed with respect to the rotation speed of the input shaft, and there is only a speed increasing region where the speed increasing rate changes.

When the maximum diameter on the large diameter side of the input cone is equal to or smaller than the minimum diameter on the small diameter side of the output cone,
During the tilting of the power transmission wheels, the output shaft always rotates at a reduced speed relative to the rotation speed of the input shaft, and there is only a deceleration range where the deceleration rate changes.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, a continuously variable transmission 1 has an input shaft 2 and an output shaft 3 rotatably held by a fixed member such as a casing or the like. 90 °), and each of the input shaft 2 and the output shaft 3 has an input cone 4
And an output cone 5.

A rotatable power transmission wheel 7 is disposed between the cones 4 and 5 around the axis of the support shaft 6. The power transmission wheel 7 has a belt 8 having a large frictional force on the outer peripheral edge, and the belt 8 has a conical surface (friction surface) of both cones 4 and 5.
9 and 10, and the support shaft 6 is disposed on a fixed member such as a casing so as to be tiltable at a predetermined angle (90 ° in the present embodiment) on a plane including the axis of the input shaft 2 and the output shaft 3. are doing. For this reason, the conical surfaces of both the cones 4 and 5 form a concave curved surface along the outer peripheral edge of the power transmission wheel 7, that is, the locus drawn by the belt 8 as it tilts.

With the above configuration, the rotational force of the input shaft 2 is transmitted to the power transmission wheel 7 via the input cone 4 rotating integrally with the input shaft 2, and the power transmission wheel 7 is transmitted via the output cone 5 to the output shaft 3. To transmit torque to

At this time, the rotation speed of the power transmission wheel 7 is
It changes depending on the diameter of the input cone 4 at the contact position of the power transmission wheel 7 with respect to the conical surface 9 of the input cone 4, and the rotational speed becomes slower as the contact position is on the smaller diameter side of the input cone 4, and the contact position is The rotational speed increases as the diameter of the input cone 4 increases. The rotation speed of the output shaft 3 changes depending on the contact position of the power transmission wheel 7 with the conical surface 10 of the output cone 5, and the rotation speed increases as the contact position is closer to the smaller diameter side of the output cone 5. As the position is closer to the large diameter side of the output cone 5, the rotation speed becomes lower.

On the other hand, the power transmission wheel 7 tilts its support shaft 6 in a plane including the axis of the input shaft 2 and the output shaft 3 so that the conical surface 9, which forms the concave curved surface of both cones 4, 5, The contact position changes while always contacting the position 10.

As shown in FIG. 1, when the tilt angle of the power transmission wheel 7 is at the intermediate position, the power transmission wheel 7 abuts on the input cone 4 and the output cone 5 having the same diameter, and the input shaft 2
The output shaft 3 rotates at a constant speed with respect to the rotation speed.

As shown in FIG. 4, as the contact position of the power transmission wheel 7 with respect to the input cone 4 moves to the small diameter side, the contact position of the power transmission wheel 7 with the output cone 5 moves to the large diameter side. The output shaft 3 rotates at a reduced speed with respect to the rotation speed of the input shaft 2.

As shown in FIG. 5, as the contact position of the power transmission wheel 7 with respect to the input cone 4 moves to the large diameter side, the contact position of the power transmission wheel 7 with the output cone 5 moves to the small diameter side. The output shaft 3 rotates at an increased speed with respect to the rotation speed of the input shaft 2.

Therefore, the rotational speed transmitted from the input shaft 2 to the output shaft 3 can be increased or decreased by adjusting the tilt angle of the power transmission wheels 7. At this time, the rate of change varies depending on the ratio of the diameters of both cones 4 and 5, and when both cones 4 and 5 have the same shape, the maximum diameter aφ on the large diameter side of input cone 4 is the output cone 5 Minimum diameter d on the small diameter side
The minimum diameter bφ larger than φ and on the small diameter side of the input cone 4
Is smaller than the maximum diameter cφ on the large diameter side of the output cone 5, there is a state where the input shaft 2 and the output shaft 3 are at a constant speed while the power transmission wheel 7 is tilted. Speed-up and deceleration ranges.

As shown in FIG. 6, when the minimum diameter bφ on the small diameter side of the input cone 4 is equal to or larger than the maximum diameter cφ on the large diameter side of the output cone 5, while the power transmission wheel 7 is tilted, The output shaft 3 always rotates at an increased speed with respect to the rotation speed of the input shaft 2, and there is only a speed increase region where the speed increase rate changes.

As shown in FIG. 7, when the maximum diameter aφ on the large diameter side of the input cone 4 is equal to or smaller than the minimum diameter dφ on the small diameter side of the output cone 5, while the power transmission wheel 7 is tilted, The output shaft 3 always rotates at a reduced speed with respect to the rotation speed of the input shaft 2, and there is only a deceleration range where the deceleration rate changes.

FIG. 8 shows another embodiment of the present invention, in which the input shaft 2 and the output shaft 3 are arranged on a straight line, and the intermediate shaft 11 is positioned at a right angle to the input shaft 2 and the output shaft 3. An intermediate cone 12 having the same shape as the input cone 4 and the output cone 5 is provided on the intermediate shaft 11 so as to be rotatable around the axis. A support shaft 13 is provided between the input cone 4 and the intermediate cone 12.
First-stage power transmission wheel 14 rotatably provided around the axis of the vehicle
Has been arranged. The first stage power transmission wheels 14 are
Thus, the support shaft 13 can be tilted at a predetermined angle on a plane including the axis of the input shaft 2 and the intermediate shaft 11 by contacting the conical surfaces 9 and 15 of both the cones 4 and 12.

Between the intermediate cone 12 and the output cone 5,
A second-stage power transmission wheel 17 provided rotatably around the axis of the support shaft 16 is arranged. The second stage power transmission wheel 17
The belt 8 comes into contact with the conical surfaces 15, 10 of the cones 12, 5, and the support shaft 16 can be tilted at a predetermined angle in a plane including the axis of the intermediate shaft 11 and the output shaft 3.

With the above configuration, the rotational force of the input shaft 2 is transmitted to the first power transmission wheel 14 via the input cone 4,
The first-stage power transmission wheels 14 transmit torque to the intermediate cone 12, and the rotational power of the intermediate cone 12 is transmitted to the second-stage power transmission wheels 17.
Transmit torque to the output shaft 3 via the output cone 5. The mechanism by which the rotation speed increases or decreases in the above-described operation is the same as in the previous embodiment, and a detailed description thereof will be omitted.

Therefore, by adjusting the tilt angles of the first-stage power transmission wheels 14 and the second-stage power transmission wheels 17 and combining the respective tilt angles, the rotational speed transmitted from the input shaft 2 to the output shaft 3 can be arbitrarily increased or decreased. Can increase or decrease at a rate
The input shaft 2 and the output shaft 3 can be arranged at right angles.

FIG. 9 shows another embodiment of the present invention, in which an input shaft 2 and an output shaft 3 are arranged in parallel and an intermediate shaft 11 is provided at a position perpendicular to the input shaft 2 and the output shaft 3. ,
An intermediate cone 18 is provided on the intermediate shaft 11 so as to be rotatable around the axis. The intermediate cone 18 has vertically symmetrical conical surfaces 19 and 20 facing the conical surface 9 of the input cone 4 and the conical surface 10 of the output cone 5.

The first-stage power transmission wheel 14 disposed between the input cone 4 and the intermediate cone 18 abuts on the conical surfaces 9 and 19 of the cones 4 and 18 with the belt 8, and the support shaft 13 is connected to the input shaft 2. And at a predetermined angle in a plane including the axis of the intermediate shaft 11.

The second-stage power transmission wheel 17 disposed between the intermediate cone 18 and the output cone 5 abuts on the conical surfaces 20, 10 of both cones 18, 5 by the belt 8, and the support shaft 16 is And at a predetermined angle on a plane including the axis of the output shaft 3.

In the above configuration, the torque of the input shaft 2 is transmitted to the first power transmission wheel 14 via the input cone 4, and the first-stage power transmission wheel 14 transmits the torque to the intermediate cone 18, The second stage power transmission wheel 17 transmits the rotational force to the output shaft 3 via the output cone 5. Therefore, by adjusting the tilt angles of the first-stage power transmission wheels 14 and the second-stage power transmission wheels 17 and combining the respective tilt angles, the rotational speed transmitted from the input shaft 2 to the output shaft 3 is increased or decreased at an arbitrary rate. Input shaft 2
And the output shaft 3 can be arranged in parallel.

As shown in FIG. 10, it is also possible to arrange the input shaft 2 and the output shaft 3 at a twisted position, and to provide the intermediate shaft 11 at a position perpendicular to the input shaft 2 and the output shaft 3. is there.

In the configuration shown in FIG. 11, the input shaft 2 and the output shaft 3 are arranged at right angles to each other, and an auxiliary output cone 21 having the same shape as the input cone 4 and the output cone 5 is provided at the other end of the output shaft 3. Are provided so as to be rotatable integrally with the output shaft 3. The first-stage power transmission wheel 14 disposed between the input cone 4 and the auxiliary main power cone 21 abuts on the conical surfaces 9 and 22 of both cones 4 and 21 with the belt 8, and the support shaft 13 is connected to the input shaft 2 and the output shaft. It can be tilted at a predetermined angle in a plane including the axis of the shaft 3. A second-stage power transmission wheel 17 disposed between the input cone 4 and the output cone 5 is connected to the belt 8 by both the cones 4,
5, the support shaft 16 can be tilted at a predetermined angle on a plane including the axis of the input shaft 2 and the output shaft 3, and is rotated in reverse with the first-stage power transmission wheel 14. It has a mechanism (not shown) that tilts in the direction.

In the above configuration, the torque of the input shaft 2 is transmitted to the first power transmission wheel 14 via the input cone 4, and the first stage power transmission wheel 14 transmits the torque to the auxiliary output cone 21, The rotational force of the cone 21 is transmitted to the output shaft 3. On the other hand, the torque of the input shaft 2 is transmitted to the second power transmission wheel 17 via the input cone 4, and the second-stage power transmission wheel 17 transmits the torque to the output shaft 3 via the output cone 5.

Therefore, by adjusting the tilt angles of the first-stage power transmission wheels 14 and the second-stage power transmission wheels 17, the rotation speed transmitted from the input shaft 2 to the output shaft 3 can be increased or decreased. Transmission power can be increased by transmitting power in the system.

In the configuration shown in FIG. 12, the input shaft 2 and the output shaft 3 are arranged on a straight line, and the connecting shaft 23 is arranged at right angles to the input shaft 2 and the output shaft 3. On the side, a pair of intermediate cones 12 having the same shape as the input cone 4 and the output cone 5 are provided so as to be rotatable integrally with the connection shaft 23.

A pair of first-stage power transmission wheels 14 disposed between the input cone 4 and each of the intermediate cones 12 abut on the conical surfaces 9 and 15 of the cones 4 and 12 with the belt 8, and rotate the support shaft 1.
3 can tilt at a predetermined angle on a plane including the axis of the input shaft 2 and the connecting shaft 23. The second-stage power transmission wheel 17 disposed between the output cone 5 and each intermediate cone 12 has:
The belt 8 contacts the conical surfaces 10 and 15 of both cones 5 and 12, and the support shaft 16 can be tilted at a predetermined angle on a plane including the axis of the connection shaft 23 and the output shaft 3.
The stage power transmission wheels 14 have a mechanism (not shown) that tilts in the opposite direction in conjunction with each other, and each second stage power transmission wheel 17 has a mechanism (not shown) that tilts in the opposite direction in conjunction with each other. .

In the above-described configuration, the torque of the input shaft 2 is transmitted to each first power transmission wheel 14 via the input cone 4, and each first stage power transmission wheel 14 transmits the torque to the intermediate cone 12, The rotational force of the intermediate cone 12 is transmitted to the output shaft 3 via the output cone 5.

Therefore, by adjusting the tilt angle of each first-stage power transmission wheel 14 and each second-stage power transmission wheel 17, the rotation speed transmitted from the input shaft 2 to the output shaft 3 can be increased or decreased. The transmission power can be increased by transmitting the power by two systems.

In the configuration shown in FIG. 13, the input shaft 2 and the pair of output shafts 3 are arranged at right angles, and each output shaft 3 is provided with an output cone 5 respectively. The first-stage power transmission wheel 14 disposed between the input cone 4 and one output cone 5 abuts on the conical surfaces 9 and 10 of both cones 4 and 5 with the belt 8, and the support shaft 13 is connected to the input shaft 2 and the output shaft 5. The output shaft 3 can be tilted at a predetermined angle on a plane including the axis. Input cone 4
The second-stage power transmission wheel 17 disposed between the output cone 5 and the other output cone 5 is connected to the belt 8 by the conical surfaces 9 of both cones 4 and 5,
10, the support shaft 16 can be tilted at a predetermined angle in a plane including the axis of the input 2 and the output shaft 3.

In the above-described configuration, the torque of the input shaft 2 is transmitted to the first power transmission wheel 14 and the second power transmission wheel 17 via the input cone 4, and the first stage power transmission wheel 14
Transmits torque via one output cone 5 to one output shaft 3.
The second stage power transmission wheel 17 is connected to the other output cone 5
The rotational force is transmitted to the other output shaft 3 via.

Therefore, the rotational speed transmitted from the input shaft 2 to each output shaft 3 is individually increased or decreased by separately adjusting the tilt angles of the first-stage power transmission wheels 14 and the second-stage power transmission wheels 17. And input 2
It can be divided into system outputs.

FIGS. 14 to 17 show a configuration in which the continuously variable reduction gear of the present invention is applied to a blower of an air conditioner.
In this air conditioner, a suction port 52 and a discharge port 53 are provided on a top surface along a longitudinal direction of a casing 51, and a ventilation path from the suction port 52 to the discharge port 53 is formed inside the casing 51. An air filter 54, a heating coil 55, a cooling coil 56, and a humidifier 57 are arranged in the road. A blower 59 driven by a motor 58 is installed inside the casing 51 immediately below the discharge port 52, and the motor 58 and the blower 59 are connected by the continuously variable transmission 1.

In the continuously variable transmission 1, as shown in FIGS. 16 and 17, the input shaft 2 is connected to the motor shaft 61 of the motor 58 via the shaft coupling 60, and the output shaft 3 is connected via the shaft coupling 62. It is connected to the blower shaft 63 of the blower 59.

As shown in FIGS.
The motor shaft 61 of the blower 59 and the blower shaft 63 of the blower 59 can be arranged at a twisted position and connected by the continuously variable transmission 1. FIGS. 20 to 21 show the stepless reduction gear of the present invention using the pump 6.
FIG. 4 shows a configuration applied to FIG. 4, wherein a motor shaft 61 of a motor 58 and a drive shaft 65 of a pump 64 are arranged at right angles,
The input shaft 2 is connected to a motor shaft 61 of a motor 58 via a shaft coupling 60, and the output shaft 3 is connected to a pump 6 via a shaft coupling 62.
4 drive shaft 65.

FIGS. 22 to 23 show another configuration in which the continuously variable reduction gear of the present invention is applied to a pump 64. A motor shaft 61 of a motor 58 and a drive shaft 65 of the pump 64 are arranged in parallel. The input shaft 2 is connected to the motor 5 via the shaft coupling 60.
8, and the output shaft 3 is connected to a drive shaft 65 of a pump 64 via a shaft coupling 62.

[0050]

As described above, according to the present invention, the torque of the input shaft is transmitted to the output shaft via the input cone, the power transmission wheel, and the output cone, or the torque of the input shaft is transmitted to the input cone, the first cone. Transmission to the output shaft via the stage power transmission wheel, intermediate cone, second stage power transmission wheel, and output cone, and by adjusting the tilt angle of the power transmission wheel, arbitrarily increase or decrease the rotation speed transmitted from the input shaft to the output shaft Can be faster.

At this time, the input cone and the output cone are formed to have appropriate diameters to increase or decrease the speed at a constant speed while the power transmission wheel is tilted. And a configuration in which the deceleration rate always changes in the deceleration direction.

[Brief description of the drawings]

FIG. 1 is a plan view of a continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a side view of the continuously variable transmission.

FIG. 3 is a front view of the continuously variable transmission.

FIG. 4 is a plan view showing a decelerated state of the continuously variable transmission.

FIG. 5 is a plan view showing a speed increasing state of the continuously variable transmission.

FIG. 6 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 7 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 8 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 9 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 10 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 11 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 12 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 13 is a plan view of a continuously variable transmission according to another embodiment of the present invention.

FIG. 14 is a plan view of an air conditioner to which the continuously variable transmission according to the present invention is applied.

FIG. 15 is a front view of the air conditioner.

FIG. 16 is an enlarged plan view of a main part of the air conditioner.

FIG. 17 is an enlarged front view of a main part of the air conditioner.

FIG. 18 is a front view of another air conditioner to which the continuously variable transmission according to the present invention is applied.

FIG. 19 is an enlarged front view of a main part of the air conditioner.

FIG. 20 is a plan view of a pump to which the continuously variable transmission according to the present invention is applied.

FIG. 21 is a front view of the pump.

FIG. 22 is a plan view of another pump to which the continuously variable transmission according to the present invention is applied.

FIG. 23 is a front view of the pump.

[Explanation of symbols]

 Reference Signs List 1 continuously variable transmission 2 input shaft 3 output shaft 4 input cone 5 output cone 6 support shaft 7 power transmission wheel 8 belt 9, 10 conical surface (friction surface) 11 intermediate shaft 12 intermediate cone 13 support shaft 14 first stage power transmission Wheel 15 Conical surface 16 Support shaft 17 Second stage power transmission wheel 18 Intermediate cone 19, 20 Conical surface

Claims (3)

[Claims] 1. An input shaft and an output shaft, an input cone and an output cone provided on each of the input shaft and the output shaft, and a contact cone disposed on both cones. A power transmission wheel that is rotatably provided, and a support shaft of the power transmission wheel can be tilted at a predetermined angle on a plane including the axis of the input shaft and the output shaft, and both cones contact the power transmission wheel. A continuously variable transmission characterized in that the conical surface of the above has a concave curved surface. 2. An input shaft, an output shaft, and at least one intermediate shaft; an input cone, an output cone, and an intermediate cone provided on each of the input shaft, the output shaft, and the intermediate shaft; and both an input cone and an intermediate cone. Place it in contact with the cone surface of the cone,
A first-stage power transmission wheel rotatably provided around the axis of the support shaft, and a first-stage power transmission wheel which is disposed in contact with the conical surfaces of the cones of both the intermediate cone and the input cone, and is rotatably provided around the axis of the support shaft. A second-stage power transmission wheel, a support shaft of the first-stage power transmission wheel can be tilted at a predetermined angle on a plane including the axis of the input shaft and the intermediate shaft, and a support shaft of the second-stage power transmission wheel is provided. The shaft is tiltable at a predetermined angle in a plane including the axis of the intermediate shaft and the output shaft, and the conical surface of each cone abutting on the first and second power transmission wheels forms a concave curved surface. Continuously variable transmission. 3. The continuously variable transmission according to claim 1, wherein at least one of the cones has a shape having a diameter different from that of the other cones.