JP3774391B2 - Full toroidal continuously variable transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a full toroidal continuously variable transmission.
[0002]
[Prior art]
In the full toroidal continuously variable transmission, the following three hydraulic systems are generally required for the shift control and the supply of lubricating oil. The first is a hydraulic system of a hydraulic cylinder for pressing the input / output disk and the roller, the second is a hydraulic system used for the operation of a clutch for switching between low rhedium and high rhedium, and the third is in the transmission. This is a hydraulic system for circulating lubricating oil.
[0003]
[Problems to be solved by the invention]
In the conventional full toroidal continuously variable transmission, all these three hydraulic pressures are generated by an engine driven hydraulic pump. For this reason, the flow rate of the oil is variable in synchronization with the rotational speed of the engine, and the pump is configured to waste energy by discharging oil even when unnecessary.
[0004]
Therefore, there is a problem that the hydraulic pump is not driven by the engine but is electrically driven so that the flow rate can be controlled and the hydraulic pressure is generated as much as necessary when necessary.
Moreover, regarding the hydraulic system for lubricating oil, it is desirable to use an electric pump instead of an engine-driven hydraulic pump so that the lubricating oil can be discharged even when the engine is stopped to prevent the seizure of the mission when the engine is started. There is a request. In a toroidal type continuously variable transmission that transmits power by interposing an oil film between the disk and the roller without directly contacting the disk and the roller, direct contact between the disk and the roller due to the oil film breakage during transmission operation is prevented. Therefore, it is important to always supply the lubricating oil to the contact portion between the disk and the roller.
[0005]
However, the drive source of a conventional electric pump is a motor with a brush, but the engine room where the electric pump is located is in a high temperature environment with an ambient temperature of 120 ° C or higher. However, there is a problem that the lifetime is short.
[0006]
On the other hand, in order to avoid brush wear, it is conceivable to use a brushless motor as a drive source of the electric pump. The brushless motor is a synchronous motor that exhibits characteristics equivalent to those of a DC motor, and is a device that includes a synchronous motor and a driver for driving.
When using a synchronous motor as a brushless motor, a sensor such as a Hall element is generally required to detect the angular position of the rotor, and an alternating current corresponding to the angular position of the rotor detected by this sensor is generated. Generated by the inverter and applied to the field winding.
[0007]
However, as described above, the engine room or the like where the electric pump is disposed is in a high temperature environment. However, a brushless motor with a sensor has a problem that the sensor is vulnerable to heat.
Thus, both a motor with a brush and a brushless motor are weak in a high temperature environment.
[0008]
Furthermore, in a motor with a sensor, if the sensor harness is long, it is likely to be affected by electrical noise, and therefore the distance between the motor and the driver needs to be shortened.
[0009]
Moreover, the conventional full toroidal continuously variable transmission has two pumps in each of the three series, and has six pumps as a whole. For this reason, if the pump drive source is replaced with a brushed motor or a brushless motor, it is necessary to arrange as many as six motors in a position avoiding high temperatures in the engine room, or to install separate heat insulation means. The above restrictions become large, and the mounting flexibility and compactness are lacking.
[0010]
The present invention has been made in view of such problems, and provides a full toroidal continuously variable transmission that can ensure the adaptability of an electric motor to a high temperature environment and can increase the degree of freedom in layout and compactness. The purpose is to do.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means. That is, according to the first aspect of the present invention, a roller that is disposed in a toroidal gap between an input disk and an output disk facing each other and transmits torque between the disks, and an end load hydraulic pressure for applying an end load to the disk. A cylinder, a carriage that can rotate the roller and tiltably support the rotation shaft of the roller, and can move forward and backward to push and pull the roller, and a hydraulic cylinder that applies driving force in the forward and backward direction of the carriage. In the full toroidal continuously variable transmission, the hydraulic pump is driven by operating an end load hydraulic cylinder and a hydraulic cylinder that applies a driving force in the advancing and retreating direction of the carriage by the hydraulic pressure generated by the hydraulic pump. A sensorless brushless motor is used as the motor to perform the sensorless brushless motor. The synchronous motor is controlled to be started by a start control device, and the start control device includes an inverter that applies an alternating current of a predetermined frequency to the field winding of the synchronous motor, and an end of the field winding of the synchronous motor Voltage detection means for detecting the voltage and the voltage detected by the voltage detection means can be corrected so that the influence of the voltage waveform based on the alternating current given by the inverter is reduced, and the voltage waveform component due to the back electromotive force can be confirmed. And a waveform correction unit that corrects the first voltage dividing resistor element connected to the field winding of the synchronous motor and the first voltage dividing resistor element connected in series. The circuit includes a second voltage-dividing resistor element and a third voltage-dividing resistor element that is detachably connected in parallel to the second voltage-dividing resistor element, and the third voltage-dividing resistor element includes: , By switching the connection / disconnection to the second voltage dividing resistor element according to the switching signal from the inverter, the voltage division ratio of the circuit is changed so that the influence of the voltage waveform based on the alternating current given by the inverter is reduced. The voltage waveform corrected by the waveform correction means is fed back to the control signal of the inverter.
[0012]
A sensorless brushless motor has no problem of brush wear and therefore has a longer life than a motor with a brush. Further, since the sensorless brushless motor does not include a sensor, it can operate even in a high temperature environment such as the vicinity of the engine.
Moreover, the harness of the sensor can be eliminated and the influence of electrical noise is not significant, so that the harness can be long. Therefore, there is no problem even if the distance between the motor and the driver is long, and the degree of freedom of these positional relationships is improved.
From the above, adaptability to a high temperature environment is improved, it is not necessary to avoid a high temperature position such as the vicinity of the engine, etc., the degree of freedom in layout is increased, and a compact design can be achieved.
[0013]
The end voltage of the field winding is a combination of a voltage waveform based on an alternating current given from the inverter and a voltage waveform based on a voltage waveform based on the counter electromotive force of the synchronous motor. However, the counter electromotive force waveform with respect to the composite waveform is small.
Therefore, in the present invention, the circuit voltage dividing ratio of the waveform correction means is changed by the switching signal from the inverter, and the combined waveform is corrected so that the influence of the voltage waveform based on the alternating current given by the inverter is reduced. The voltage waveform component due to the back electromotive force becomes clear.
Therefore, even when the rotational speed of the armature is slow at the time of starting the synchronous motor, the phase difference of the back electromotive force component can be reflected in the control signal of the inverter. The sensorless mode can be set, and even if the pump is repeatedly controlled to stop and start as necessary, the startability up to the sensorless mode is good, so that a smooth operation is ensured.
[0014]
Further, the second invention further includes a lubricating oil pump for supplying lubricating oil to the contact portion between the both disks and the roller, and a sensorless brushless motor is used as a motor for driving the lubricating oil pump. It is characterized by that.
[0015]
Also in the second invention, by adopting a sensorless brushless motor,
Since the life is long, adaptability to high temperature environments is improved, and it is not necessary to avoid high temperature positions such as the vicinity of the engine, the degree of freedom in layout is increased and the size can be reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a main part of a full toroidal continuously variable transmission according to an embodiment of the present invention. In the figure, the variator 1 of the full toroidal continuously variable transmission according to the present embodiment is provided with an input shaft 3 that is connected to an output shaft (not shown) of an engine that is a power source of the vehicle and is rotationally driven. The input disks 5 are supported in the vicinity of both ends.
[0017]
A concave curved track surface 5b is formed on one side surface of each input disk 5, and a spline hole 5a having a plurality of grooves is formed on the inner periphery thereof. The input disk 5 is assembled to the input shaft 3 so as to be integrally rotatable by coupling the spline hole 5a to a spline shaft 3a provided in the input shaft 3. Further, each input disk 5 is restricted from moving away from each other by a locking ring 51 fixed to the input shaft 3.
[0018]
An output portion 6 including an output member 6a and an output disk 6b supported by the output member 6a so as to be integrally rotatable with each other is relatively rotated with respect to the input shaft 3 at the axial center portion of the input shaft 3. It is provided freely. A concave curved track surface 6c is formed on one side surface of the output disk 6b facing the track surface 5b of the input disk 5. A sprocket gear 6e that meshes with the chain 6d is formed on the outer periphery of the output member 6a, and power is extracted to the outside through the chain 6d.
[0019]
The output disk 6b is incorporated in a state in which fine movement in the axial direction is allowed with respect to the output member 6a, and a back plate 6h is provided on the back surface thereof with a gap constituting the oil chamber 6g of the end load cylinder. Is arranged. The oil chamber 6g is sealed by a casing 6f and a seal (not shown). By supplying oil pressure from the hydraulic circuit to the oil chamber 6g, the output disk 6b is urged toward the opposing input disk 5 to thereby end the terminal. A load is applied.
[0020]
A space between the raceway surface 5b of the pair of input disks 5 and the raceway surface 6c of the output disk 6b facing each other is formed as a toroidal gap, and each toroidal gap has a plurality of, for example, three disc shapes. The rollers 7 are arranged at equal circumferences.
Lubricating oil is supplied from the hydraulic circuit between the roller 7 and the raceway surfaces 5b and 6c. In FIG. 1, only one roller 7 disposed in each toroidal gap is shown for the sake of simplification of the drawing.
[0021]
Further, as shown by the solid line in FIG. 1, each of the rollers 7 has a position on the both raceway surfaces 5b and 6c where the toroidal gap is the maximum dimension in the opposing direction of the both raceway surfaces 5b and 6c. It is arranged so as to be able to roll, and is supported by a carriage 8 so as to be rotatable and its rotation shaft 7a being tiltable. A driving force by a hydraulic cylinder is applied to the carriage 8 in a direction intersecting the paper surface of FIG. 1, and the rotation shaft 7a tilts as shown by a two-dot chain line in FIG.
[0022]
FIG. 2 shows a hydraulic circuit. This hydraulic circuit supplies hydraulic oil to the hydraulic cylinder 10 and the end load cylinder for tilting the rotating shaft 7a of the roller, and supplies lubricating oil between the roller 7 and the raceway surfaces 5b and 6c. Is.
In FIG. 2, for the sake of simplification of explanation, the configuration relating to one roller 7 is shown, but in reality, a hydraulic cylinder 10 is provided for each roller.
[0023]
In the figure, the carriage 8 is connected to the roller 7. The carriage 8 has first and second oil chambers 10a and 10b, and applies a driving force to the carriage 8 in the forward and backward directions. A hydraulic cylinder 10 is connected.
[0024]
Hydraulic pipes 31 and 32 are connected to the first and second oil chambers 10 a and 10 b, respectively. The hydraulic pipes 31 and 32 are connected to the first hydraulic pump 11 via the proportional valve 23. The first hydraulic pump 11 is connected to the oil tank 20 via a hydraulic pipe 30 and supplies hydraulic oil from the oil tank 20 to the first and second oil chambers 10a and 10b. Further, electromagnetic pressure control valves 14 and 15 controlled by a control device (not shown) are connected to the first and second oil chambers 10a and 10b via hydraulic pipes 33 and 34, respectively.
These electromagnetic pressure control valves 14 and 15 are connected to the oil tank 20 via hydraulic pipes 35 and 36, respectively, and supply hydraulic oil to the first and second oil chambers 10a and 10b with the above configuration. Is configured to generate hydraulic pressures P1 and P2 for pushing and pulling the roller 7 in the first and second oil chambers 10a and 10b, respectively.
[0025]
In addition, since the switching between the first oil chamber 10a and the second oil chamber 10b is performed by the proportional valve 23, the valve can be switched linearly, and the pressure is rapidly reduced by switching the valve at the time of high pressure, and the transmission shift It can prevent a shock.
[0026]
Further, hydraulic oil is supplied from the hydraulic pipe 38 via the shuttle valve 22 to the oil chamber 6g of the end load cylinder. The shuttle valve 22 is for supplying high-pressure oil pressure to the oil chamber 6g out of the oil pressure of the hydraulic pipe 31 and the hydraulic pipe 32.
The hydraulic circuit includes a second hydraulic pump 12 for supplying lubricating oil to a variator and the like in addition to the first hydraulic pump 11 for supplying oil to the shift control actuators 10 and 6b. Lubricating oil is supplied from the second hydraulic pump 12 to the variator side via the proportional valve 24, and lubricating oil required at the contact portion between the input and output disks 5, 6b and the roller 7 is supplied. The second hydraulic pump also supplies the lubricating oil to the chain 6d and other parts where the lubricating oil is required.
[0027]
Although not shown, the hydraulic circuit includes a third hydraulic pump that is used to actuate a clutch for switching between the low and high rhediums of the toroidal continuously variable transmission. The third hydraulic pump is connected to the low rhedium clutch and the high radium clutch via the proportional valve.
[0028]
The first hydraulic pump 11, the second hydraulic pump 12, and the third hydraulic pump are each constituted by an electric pump driven by an electric motor. Therefore, compared with an engine-driven pump, energy consumed by the engine can be saved, and pump noise due to a high engine speed can be reduced.
[0029]
Here, the first hydraulic pump 11 is one electric pump equipped with a motor of about 1 kW, the second hydraulic pump 12 is one electric pump equipped with a motor of about 300 W, and the third hydraulic pump The pump is a single electric pump equipped with a motor of about 1 kW. In this way, an electric pump having an output suitable for each of the three hydraulic systems is provided, and the hydraulic flow rate is optimized. Further, since each series is constituted by a single pump, the apparatus can be reduced in size.
[0030]
FIG. 3 shows a schematic configuration diagram of the first to third hydraulic pumps 11 and 12. The hydraulic pumps 11 and 12 include a pump main body 15, a motor 16 for driving the pump main body 15, and a driver 17 for the motor 16. The driver 17 and the motor 16 are driven by electric power supplied from a battery 18. Be operated. Note that the voltage of the battery 18 corresponds to a higher voltage (for example, DC42V) that will be required in the future.
[0031]
For the first to third hydraulic pumps 11 and 12 that are electric pumps, a sensorless brushless motor is employed as the motor 16 and the driver (startup control device) 17. That is, a synchronous motor is used as the motor, and there is no sensor for detecting the angular position of the rotor. The driver 17 always operates with high efficiency so that the synchronous motor 16 exhibits a characteristic equivalent to a DC motor. Is done.
[0032]
The first to third hydraulic pumps 11 and 12 are arranged in the engine room. However, since the motor is sensorless and brushless, it can operate stably in a long life even in a high temperature environment, so avoid high temperature engines. There is no need to place them. For this reason, the freedom degree of mounting becomes high and size reduction can be achieved.
In particular, in the full toroidal type continuously variable transmission as in the present embodiment, the number of hydraulic pumps necessary for the control and the like is large or the size is large, and thus the above effect is remarkable.
[0033]
As shown in FIG. 4, the synchronous motor 16 has an armature (rotor) 82 and a field winding 81. An alternating current having a predetermined frequency is applied to the field winding 81 of the synchronous motor 16 from the three-phase inverter circuit 91. The end voltage of the field winding 81 is detected by the voltage detection / waveform correction circuit 110, and the detected voltage is waveform-corrected so that the voltage waveform component due to the counter electromotive force can be confirmed, as will be described later. .
[0034]
The corrected voltage waveform is integrated by the integration circuit 111, further converted into a square wave by the square wave conversion circuit 112, and then given as one input of the phase difference detection circuit 104.
On the other hand, the oscillation output of the oscillation circuit 101 (this oscillation circuit 101 can be constituted by, for example, a VCO (Voltage Controlled Oscillator)) is given to the 120 ° energization waveform generation circuit 102 to control the synchronous motor 16. A 120 ° energization waveform is generated. This waveform is given to a PWM (Pulse Width Modulation) circuit 106, and the inverter circuit 91 is controlled by its output.
[0035]
The phase of the voltage is extracted from the output of the 120 ° energization waveform generation circuit 102, and the extracted voltage phase is given as the other input of the phase difference detection circuit 104. The phase difference detection circuit 104 detects and outputs the phase difference between the two voltages of the output of the square wave conversion circuit 112 and the output of the 120 ° energization waveform generation circuit 102. The phase difference is amplified by the differential amplifier 105 and fed back to the oscillation circuit 101. Thereby, the oscillation frequency of the oscillation circuit 101 is controlled.
[0036]
Since the back electromotive force appearing at the end voltage of the field winding 81 of the synchronous motor 16 is fed back to the control signal of the inverter 91 in this way, when the back electromotive force is generated, the back electromotive force is immediately determined based on the back electromotive force. Since the output of the energization waveform generation circuit 102 is adjusted, the synchronous motor 16 enters a commutation mode (sensorless mode) in a very short period after starting.
[0037]
In the circuit shown in FIG. 3, the gain of the differential amplifier 105 is controlled based on the speed setting signal. That is, the gain of the differential amplifier 105 is proportional to the speed setting signal so that the synchronous motor 16 can be accelerated smoothly. Further, the difference between the output frequency of the oscillation circuit 101 and the set frequency that is the speed setting signal is obtained by the subtractor 107, amplified by the amplifier 108, and supplied to the PWM circuit 106. As a result, the peak value of the waveform generated by the 120 ° energization waveform generation circuit 102 is controlled.
[0038]
FIG. 5 is a circuit diagram showing a specific example of the voltage detection / waveform correction circuit 110. This circuit 110 includes voltage detection means for detecting the end voltage of the field winding 81, and waveform correction for correcting the detected voltage so that the influence of the voltage waveform based on the alternating current given by the inverter is reduced. Functions as a means. As shown in FIG. 5, the voltage detection / waveform correction circuit 110 can be configured by a circuit including, for example, three voltage dividing resistance elements 121 to 123 and an analog switch 124. The resistance elements 121 and 122 are connected in series, and one end of the resistance element 121 is connected to the end of the field winding 81 of the synchronous motor 16. The open end of the resistance element 122 is grounded. Thereby, the voltage divided by the resistance ratio of the resistance elements 121 and 122 can be detected as the end voltage of the field winding 81. This detection voltage is applied to the integration circuit 111 to form an integrated waveform.
[0039]
In this embodiment, a resistance element 123 is connected in parallel to the resistance element 122. The resistance element 123 is connected via an analog switch 124 so that it can be connected or disconnected at an arbitrary timing. The analog switch 124 is composed of, for example, a non-contact switch such as a MOS transistor. The analog switch 124 is switched by a switching signal of the inverter 91 (a signal given from the PWM circuit 106).
[0040]
With this configuration, since the voltage dividing ratio of the voltage detection circuit changes depending on whether the analog switch 124 is turned on or off, the resistance is divided by turning on the analog switch 124 only during a period in which current is supplied from the inverter 91 to the synchronous motor 16. The influence of the voltage waveform based on the current output from the inverter 91 can be reduced by changing the pressure ratio.
[0041]
As shown in FIG. 6a, when the synchronous motor 16 is started, an AC current having a low frequency is supplied from the inverter 91 to the field winding 81, and the armature (rotor) 82 is drawn to start rotation. When the armature 82 rotates, a counter electromotive force is generated, and the amplitude of the counter electromotive force increases as the armature 82 increases in rotation. The end voltage of the field winding 81 is a composite waveform of a voltage waveform based on the alternating current supplied from the inverter 91 and a voltage waveform based on the back electromotive force (FIG. 6b).
[0042]
Even if this combined waveform is directly applied to the integrating circuit 111, the counter electromotive force component is hardly reflected in the integrated waveform because the counter electromotive force waveform with respect to the entire combined waveform is small.
Here, since the alternating current waveform supplied from the inverter 91 is a waveform output by the inverter 91 itself and is already known, the circuit 110 as a waveform correction means is used to convert the alternating current waveform from the inverter 91 into a waveform. The influence of the voltage waveform based on the output current is reduced to clarify the back electromotive force component as shown in FIG.
[0043]
Therefore, even when the rotational speed of the armature 82 is slow when the synchronous motor 16 is activated, the phase difference (advanced phase) of the back electromotive force component can be reflected in the control signal to the inverter 91, and a short time immediately after activation. Among them, the synchronous motor 16 can be set to a commutation mode (sensorless mode). As a result of actual measurement, the synchronous motor 16 was able to be in the commutation mode (sensorless mode) in about 0.06 seconds.
[0044]
For smooth operation, the hydraulic pumps 11 and 12 used in the transmission are required to have, for example, 0.2 seconds or less before the hydraulic pressure rises as an electric pump. 1 second or less is required, but the above sensorless brushless motor can sufficiently satisfy this requirement.
[0045]
Therefore, the hydraulic pressure can be quickly raised immediately before the engine is started from the engine stopped state, and smooth operation is ensured even if the control for repeatedly stopping and starting the pump is performed as necessary. Further, even when the pump is always operated, since it is sensorless and brushless, it can have a long life even in a high temperature environment.
In addition, since the startability is good, it is possible to start the lubricating oil system second hydraulic pump 12 before starting the transmission and supply lubricating oil before starting the transmission, thereby preventing seizure of the transmission. it can.
[0046]
FIG. 7 shows a second embodiment. In the second embodiment, an engine drive pump 11a and an electric pump 11b driven by an electric motor are used as the first hydraulic pump. Both pumps 11a and 11b are arranged in parallel, and oil can be supplied from both pumps 11a and 11b to the oil chamber 6g of the hydraulic cylinder 10 and the end load cylinder. Here, the engine drive pump 11a is used as a main pump, and the electric pump 11b is used as an auxiliary pump. That is, when the vehicle is traveling, the actuators 10 and 6g are driven by the engine drive pump 11a, and when the vehicle is idle stopped, the hydraulic pressure can be generated by the electric pump to set the transmission in the idle state.
Therefore, if the accelerator pedal is depressed from the idle stop state, the vehicle can be started instantly.
[0047]
In addition, when the vehicle is traveling normally, oil is supplied by the engine drive pump 11a, and when the engine speed becomes small and the oil flow rate is likely to be insufficient, the electric pump 11b can be operated to ensure the minimum flow rate.
By doing in this way, the pump capacity | capacitance of the engine drive pump 11a can be made small, an engine load becomes small and energy saving can be achieved.
[0048]
【The invention's effect】
According to the present invention, since a sensorless brushless motor is used for the pump, it has no problem of brush wear and has a long life, and since it is not equipped with a sensor, it can operate even in a high temperature environment such as the vicinity of the engine. .
Therefore, adaptability to a high temperature environment is improved, it is not necessary to avoid a high temperature position such as the vicinity of the engine, the degree of freedom in layout is increased, and a compact design can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a main part of a toroidal-type continuously variable transmission.
FIG. 2 is a hydraulic circuit diagram of a toroidal type continuously variable transmission.
FIG. 3 is a schematic configuration diagram of a sensorless brushless motor.
4 is a specific circuit configuration diagram of a driver and a synchronous motor in FIG. 3. FIG.
FIG. 5 is a circuit showing a specific example of a voltage detection / waveform correction circuit;
FIG. 6 is a waveform diagram illustrating that a waveform is corrected.
FIG. 7 is a hydraulic circuit according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Variator 5 Input disk 6a Output disk 7 Roller 10 Hydraulic cylinder 11 1st hydraulic pump (for shift control actuator)
12 Second hydraulic pump (for lubrication)

Claims (2)

A roller arranged in a toroidal gap between the opposing input disk and output disk to transmit torque between both disks;
An end load hydraulic cylinder for applying an end load to the disc;
A carriage that is rotatable and supports the rotation axis of the roller in a tiltable manner, and a carriage that can be advanced and retracted to push and pull the roller;
A hydraulic cylinder for applying a driving force in the forward and backward direction of the carriage;
With
In a full toroidal continuously variable transmission that performs shift control by operating a hydraulic cylinder for end load and a hydraulic cylinder that applies a driving force in the advancing and retreating direction of the carriage by the hydraulic pressure generated by the hydraulic pump,
A sensorless brushless motor is used as a motor for driving the hydraulic pump,
In the sensorless brushless motor, the synchronous motor is controlled to be activated by the activation control device,
The activation control device includes:
An inverter for applying an alternating current of a predetermined frequency to the field winding of the synchronous motor;
Voltage detection means for detecting the end voltage of the field winding of the synchronous motor;
A waveform correcting means for correcting the voltage detected by the voltage detecting means so that the influence of the voltage waveform based on the alternating current given by the inverter is reduced, and correcting the voltage waveform component due to the back electromotive force;
With
The waveform correcting means includes a first voltage dividing resistor element connected to a field winding of the synchronous motor, a second voltage dividing resistor element connected in series to the first voltage dividing resistor element, and the second voltage dividing element. And a third voltage dividing resistor element connected in parallel with the voltage resistive element in a separable manner, and the third voltage dividing resistive element is connected to the second voltage dividing element by a switching signal from the inverter. By switching the connection / disconnection to the voltage dividing resistor element, the voltage dividing ratio of the circuit is changed, and the correction is made so that the influence of the voltage waveform based on the alternating current given by the inverter becomes small.
A full toroidal continuously variable transmission, wherein the voltage waveform corrected by the waveform correcting means is fed back to the control signal of the inverter. Further comprising a lubricating oil pump for supplying lubricating oil to the contact portion between the two disks and the roller,
2. The full toroidal continuously variable transmission according to claim 1, wherein a sensorless brushless motor is used as a motor for driving the lubricating oil pump.

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