JP6519327B2 - Toroidal type continuously variable transmission - Google Patents

Description

  This invention is used, for example, in automatic transmissions for vehicles (cars), automatic transmissions for construction machines (construction machines) and agricultural machines (agriculture machines), aircraft (fixed wing machines, rotary wing machines, airships, etc.) The present invention relates to improvement of a toroidal continuously variable transmission used by being incorporated in an automatic transmission for adjusting the operating speed of various industrial machines such as an automatic transmission for a generator (generator) and a pump.

  The use of toroidal type continuously variable transmissions as transmissions for motor vehicles is described in many publications and is implemented and known in part. 6 to 8 show an example of the conventional structure of such a toroidal type continuously variable transmission. This toroidal type continuously variable transmission is called a double cavity type, and supports the input side disks 2, 2 around the both ends of the input shaft 1 via ball splines 3, 3. Therefore, the two input disks 2 are supported coaxially and freely in synchronization with each other. Further, an output gear 4 is supported around an intermediate portion of the input shaft 1 so as to freely rotate relative to the input shaft 1. Then, the output side disks 5 are spline-engaged with both end portions of a cylindrical portion provided at the central portion of the output gear 4. Therefore, these both output side disks 5, 5 rotate synchronously with the output gear 4.

  Further, a plurality of (usually two to three) power rollers 6, 6 are held between the both input side disks 2, 2 and the both output side disks 5, 5, respectively. These power rollers 6, 6 are rotatably supported on the inner side surfaces of trunnions 7, 7 as support members via support shafts 8, 8 and a plurality of rolling bearings. The respective trunnions 7, 7 are pivotally displaceable around pivots 9, 9 provided concentrically with each other at each of the respective trunnions 7, 7 at respective longitudinal end portions. The operation of inclining the trunnions 7 is performed by displacing the trunnions 7 in the axial direction of the pivots 9 by the hydraulic actuators 10.

  At the time of operation of the toroidal type continuously variable transmission as described above, the input side disk 2 of one (left side in FIGS. 6 to 7) and the pressing device 12 of the loading cam type are Drive through rotation. As a result, the pair of input side disks 2, 2 supported at both ends of the input shaft 1 rotate in synchronization while being pressed in a direction approaching each other. Then, this rotation is transmitted to the both output side disks 5, 5 through the power rollers 6, 6 and taken out from the output gear 4.

  When the rotational speed ratio between the input shaft 1 and the output gear 4 is changed, first, when decelerating is performed between the input shaft 1 and the output gear 4, the respective trunnions 7 and 7 are as follows: It is swung to the position shown in FIG. Then, as shown in FIG. 7, the peripheral surfaces of the power rollers 6, 6 are the outer portions of the inner side surfaces of the both input side disks 2, 2 and the outer periphery of the inner side surfaces of the both output side disks 5, 5 Abut on each of the close parts. On the contrary, when acceleration is performed, the trunnions 7, 7 are rocked in the opposite direction to that in FIG. The circumferential surface of each of the power rollers 6, 6 is opposite to the outer peripheral portion of the inner side surface of the both input side disks 2, 2 and the both output side disks 5, 5 contrary to the state shown in FIG. The respective trunnions 7, 7 are inclined so as to respectively abut the center portion of the inner surface. If the inclination angles of these trunnions 7, 7 are made to be intermediate, an intermediate speed ratio (gear ratio) can be obtained between the input shaft 1 and the output gear 4.

  When such a toroidal type continuously variable transmission as described above is incorporated into an actual continuously variable transmission for an automobile, it is possible to construct a continuously variable transmission by combining it with a gear type differential unit such as a planetary gear mechanism. First, also described in many publications, are widely known in the art. In order to put this type of continuously variable transmission into practical use as an automatic transmission for automobiles, the torque (passing torque) passing through the above-described toroidal type continuously variable transmission is measured, and this toroidal type continuously variable transmission It is necessary to control the gear ratio of the engine and the output of the engine.

  The passing torque can also be determined indirectly from the number of revolutions of the engine and the degree of accelerator opening, but this is not practical because the error becomes large according to various situations. On the other hand, Patent Document 1 describes a toroidal continuously variable transmission capable of directly measuring the passing torque. The toroidal type continuously variable transmission described in the patent document 1 has first and second end portions and an intermediate portion of a hollow rotary shaft that transmits torque between an output side disk and a sun gear of a planetary gear mechanism. Of the first and second rotation detection sensors supported by a part of a pair of support columns provided to support both ends of the output-side disc, Is closely opposed to the detected portion of the encoder. When the hollow rotary shaft is elastically torsionally deformed in accordance with the transmission of torque, the phases of the first and second encoders in the circumferential direction are shifted, so the output signals of the first and second rotation detection sensors are mutually different. The torque (passing torque) can be obtained based on the phase difference between them.

However, in the case of the structure described in Patent Document 1 described above, there is room for improvement from the viewpoint of easily ensuring the measurement sensitivity of the passing torque.
That is, in the case of the structure described in the above-mentioned patent document 1, since the amount of elastic twist deformation of the hollow rotating shaft accompanying the load of passing torque is small, the amount of change of the phase difference is also small. As a result, it is difficult to increase the measurement sensitivity of the passing torque.

Unexamined-Japanese-Patent No. 2004-308859

  SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention has been invented in order to realize a structure in which it is easy to ensure the measurement sensitivity of the passing torque of a toroidal type continuously variable transmission.

The toroidal type continuously variable transmission according to the present invention has an input side disk and an output side disk which are disposed coaxially with each other with their inner side surfaces facing each other freely for relative rotation, and both the input side and the output side. A plurality of power rollers sandwiched between the disks, a plurality of support members rotatably supporting the power rollers, and displacement of the respective support members allow the disks on both the input side and the output side And a pressing device for pressing both the input side and the output side disks in a direction approaching each other in the axial direction.
Further, in this pressing device, a driven cam surface, which is an unevenness in the circumferential direction, provided on the outer surface of the input disc, and an inner surface axially facing the driven cam surface are circumferentially arranged. And a cam plate coaxial with the input-side disc and freely provided with relative displacement in the rotational direction relative to the input-side disc, the drive-side cam surface and the driven-side cam It is a loading cam type | mold thing provided with the several rolling element clamped between surfaces.
In particular, in the case of the toroidal type continuously variable transmission of the present invention, the first encoder, the second encoder, the first sensor, and the second sensor are provided.
The first encoder is a cam plate or a member that rotates in synchronization with the cam plate (for example, a drive shaft that transmits torque to the cam plate, or a crankshaft of an engine that transmits torque to the drive shaft) A member rotating in synchronization with the input side disk or the input side disk (for example, an input shaft on which the input side disk having the driven side cam surface is externally supported, or the external surface is supported on the input shaft Another input-side disc) and a member that revolves in synchronization with the rolling elements (rotation of the cam plate and the input-side disc with changes in the magnitude of the torque input to the cam plate) A member which is relatively displaced in the direction, for example, an annular member holding the rolling elements, one of the two target members (one member or a separate member) As) It is is varied alternately in the circumferential direction of the characteristic of the detector itself.
In addition, the second encoder is provided on the other target member (integrally or as a separate member) of the two target members, and alternately changes the characteristics of its own detected portion in the circumferential direction. ing.
The first sensor is supported by a portion which does not rotate even in use in a state in which the detection portion of the first encoder is opposed to the detection portion of the first encoder. The output signal is changed in accordance with the characteristic change of the portion in which the detection unit is opposed.
The second sensor is supported by a portion which does not rotate even in use in a state in which the detection portion of the second encoder is opposed to the detection portion of the second encoder. The output signal is changed in accordance with the characteristic change of the portion in which the detection unit is opposed.
Then, based on the phase difference between the output signals of the first and second sensors and the transmission ratio, the torque (passing torque of the toroidal type continuously variable transmission) input to the cam plate is measured. (Calculation) It is free.

In the practice of the present invention, preferably, the first encoder is provided on the outer peripheral portion of the one target member.
In addition, preferably, the second encoder is provided on an outer peripheral portion of the other target member.

When the present invention is carried out, any type of first (second) sensor type may be used as long as it can acquire a pulse signal according to the rotation of the one (other) target member. Depending on the type of sensor to be used, the shape, processing, molding, etc. of a part (for example, the outer peripheral part) of the one (the other) target member may be appropriately determined. In other words, if the combination of the first (second) encoder and the first (second) sensor can acquire a pulse signal according to the rotation of the target member, various combinations should be adopted. Can.
For example, the first (second) encoder provided on a part (for example, the outer peripheral portion) of the one (the other) target member (integrally or as a separate member) It can also be made of a magnetic material in which concave portions, through holes, notches, etc.) and solid portions (convex portions, pillars, tongues, etc.) are alternately arranged in the circumferential direction, or a detection surface It is also possible to use a multipole magnet in which the part magnetized to the S pole and the part magnetized to the N pole are alternately arranged in the circumferential direction.
When the above-mentioned magnetic material is used as the first (second) encoder, an electromagnetic pick-up rotation sensor or a Hall element is used as the first (second) sensor. A magnetic detection sensor incorporating a magnetic detection element such as a Hall IC, an MR element (including a GMR element, a TMR element, an AMR element) and a permanent magnet can be used.
On the other hand, in the case where the multipolar magnet as described above is used as the first (second) encoder, the magnetic detection element as described above is used as the first (second) sensor in the detection unit. The built-in magnetic detection sensor can be used. In this case, it is not necessary to provide a permanent magnet in the magnetic detection sensor.

More specifically, when the present invention is implemented, the following detection means 1 and 2 can be employed.
"Detection means 1"
The first and second target members are made of a magnetic material such as magnetic steel, and the outer peripheral portions of the first and second target members are shaped into a concavo-convex shape like a gear. And these both outer peripheral parts are made into the to-be-detected part of a 1st, 2nd both encoder.
At the same time, the electromagnetic pickup rotation sensor is used as each of the first and second sensors.
"Detection means 2"
The first and second target members are made of a magnetic material such as magnetic steel, and the outer peripheral surface of the first and second target members is a portion magnetized to the S pole and a portion magnetized to the N pole. Arrange alternately in the circumferential direction. And these both outer peripheral surfaces are made into the to-be-detected part of a 1st, 2nd both encoder.
At the same time, the magnetic detection sensor (having no permanent magnet) is used as both the first and second sensors, and the first and second sensors are integrated by a single sensor holder. , Constitute one sensor unit.

Further, in the case of practicing the present invention, for example, the one target member provided with the first encoder is synchronized with the cam plate or a member rotating in synchronization with the cam plate, or synchronized with each rolling element Of the other target member provided with the second encoder, in synchronization with the input-side disc or the input-side disc In addition to the rotating member, a third encoder and a third sensor can be provided.
The third encoder is provided (integrally or as a separate member) on the output-side disc or a part that rotates in synchronization with the output-side disc, and the characteristics of its own detected part in the circumferential direction It shall be changed alternately.
Further, the third sensor is supported by a portion that does not rotate even in use in a state in which the detection portion of the third encoder faces the detection portion of the third encoder, and the third sensor is The output signal is changed in accordance with the characteristic change of the portion in which the detection unit of FIG.
Then, the transmission ratio can be measured (calculated) freely based on the cycle (or frequency) of the output signal of the second sensor and the cycle (or frequency) of the output signal of the third sensor.
The combination of the third encoder and the third sensor is also the same as the combination of the first (second) encoder and the first (second) sensor, the output side disc or the output side disc Various combinations can be adopted as long as it can acquire a pulse signal according to the rotation of the part rotating in synchronization with the above.

  Further, the toroidal type continuously variable transmission of the present invention includes a gear type differential unit (for example, a planetary gear device) formed by combining a plurality of gears, and between the toroidal type continuously variable reduction device and the differential unit. The continuously variable transmission can be configured together with a clutch device for switching the power transmission state of

According to the toroidal continuously variable transmission of the present invention configured as described above, it is easy to ensure the measurement sensitivity of the passing torque (torque input to the cam plate constituting the pressing device) of the toroidal continuously variable transmission it can.
That is, in the case of the present invention, the cam plate or the member rotating in synchronization with the cam plate, the input side disk or the member rotating in synchronization with the input side disk, and the synchronization with the rolling elements Relative displacement of the two target members (the first and second encoders provided on them) in the rotational direction, which are selected from among the members rotating and revolving, between the output signals of the first and second sensors The passing torque can be measured based on the phase difference and the transmission ratio between the input and output disks. In particular, in the case of the present invention, the first and second target members have a larger relative displacement amount per unit passing torque in the rotational direction than the two axial positions of the torque transmission shaft. Both encoders are provided. Therefore, the measurement sensitivity of the passing torque can be easily ensured.

The figure similar to FIG. 6 which shows the 1st example of embodiment of this invention. The A section enlarged view of FIG. Diagram showing the output signals (A-phase, B-phase) of the first and second sensors in a state where torque is not applied (a) and a state where torque is applied (b). FIG. 8 is a diagram showing an example of the relationship between the phase difference ratio between the output signals of the first and second sensors, the transmission ratio between both the input and output disks, and the passing torque. The figure similar to FIG. 2 which shows the 2nd example of embodiment of this invention. Sectional drawing which shows one example of the toroidal type continuously variable transmission conventionally known. BB sectional drawing of FIG. CC sectional drawing of FIG.

First Example of Embodiment
A first example of the embodiment of the present invention will be described with reference to FIGS.
The feature of this example mainly measures the torque (passing torque) passing through the toroidal type continuously variable transmission to the installation portion of the loading cam type pressing device 12a and one (left in FIG. 1) input side disc 2a. The point is to load the configuration to do. The configuration and operation of the other parts are basically the same as those of the conventional structure shown in FIGS.

  That is, the toroidal type continuously variable transmission of this embodiment is called a double cavity type, and supports the input side disks 2 a and 2 around the both end portions of the input shaft 1 via the ball splines 3 and 3. Therefore, both the input side disks 2a, 2 are supported coaxially and freely rotatably in synchronization with each other. Further, an output gear 4 is supported around an intermediate portion of the input shaft 1 so as to freely rotate relative to the input shaft 1. The output side disks 5a and 5 are spline-engaged with both ends of a cylindrical portion provided at the center of the output gear 4. Therefore, these both output side disks 5a, 5 rotate synchronously with the output gear 4. Further, a plurality of (usually two to three) power rollers 6, 6 are provided between the input side disks 2a, 2 and the output side disks 5a, 5 (see FIGS. 7 to 8). It is pinching. Each of these power rollers 6, 6 is provided on the inner surface of trunnions 7, 7 (see FIGS. 7-8) as support members via support shafts 8, 8 (see FIGS. 7-8) and a plurality of rolling bearings. , Is rotatably supported. The respective trunnions 7, 7 are pivotally displaceable around pivots 9, 9 (see FIG. 8) provided concentrically with each other at the respective longitudinal ends of the respective trunnions 7, 7. The operation (speed change operation) for inclining each of these trunnions 7, 7 is performed by displacing each of these trunnions 7, 7 in the axial direction of the pivots 9, 9 by hydraulic actuators 10, 10 (see FIG. 8). .

  Also in the case of this example, at the time of operation, one (left side in FIG. 1) input side disc 2a is rotationally driven via the loading cam type pressing device 12a by the drive shaft 11 connected to a power source such as an engine. . As a result, the pair of input-side disks 2a, 2 supported at both ends of the input shaft 1 rotate in synchronization while being pressed in a direction approaching each other. Then, this rotation is transmitted to the both output side disks 5 a 5 via the power rollers 6 6 and taken out from the output gear 4.

  The pressing device 12a is a plurality of sets held in a rollable manner by a disk-shaped cam plate 13 disposed around the base end (the left end in FIG. 1) of the input shaft 1 and an annular retainer 14. The rollers 15, 15 are rolling elements (for example, four sets). The cam plate 13 is provided concentrically with the input shaft 1 around the base end of the input shaft 1 by a rolling bearing 16 capable of supporting radial loads and thrust loads such as angular ball bearings. Relative rotation with respect to the input shaft 1 is freely supported. The bearing ring constituting the rolling bearing 16 may be provided separately from the input shaft 1 and the cam plate 13 as shown in FIG. 1, or as shown in FIG. It can also be provided integrally with the cam plate 13. Further, the inner side surface (right side surface in FIGS. 1 and 2) of the cam plate 13 is a drive side cam surface 17 which is uneven in the circumferential direction. Further, the outer surface (left surface in FIGS. 1 and 2) of the input disk 2a, which is axially opposed to the drive cam surface 17, has a shape similar to that of the drive cam surface 17. The side cam surface 18 is used. Then, with the rollers 14, 15 nipped between the drive side cam surface 17 and the driven side cam surface 18 while being held rollably in the pocket of the cage 14, the input shaft 1 It is rotatably supported centering on the radial axis with respect to the center of. The cage 14 revolves in synchronization with the rollers 15, 15.

  The pressing device 12a having such a configuration mechanically generates a pressing force proportional to the magnitude of the torque (= the passing torque) input from the drive shaft 11 to the cam plate 13. Specifically, as the torque input to the cam plate 13 increases, the rollers 15, 15 are directed from the bottom side portion of the drive side cam surface 17, 18 toward the top side portion of the driven side cam surfaces 17, 18. The distance between the cam plate 13 and the one input side disc 2a is expanded by moving in a stationary manner. By such an action, the pressing device 12a generates a pressing force proportional to the magnitude of the torque. Then, by pressing the both input side discs 2a, 2 with each other by the pressing force in the direction approaching each other, the circumferential surface of each of the power rollers 6, 6 and the inner side face of the both input side discs 2a, 2 and the above The surface pressure of the traction portion which is the contact portion with the inner side surface of both output side disks 5a, 5 is secured, and the occurrence of harmful slippage in each of these traction portions is prevented or suppressed. In addition, when the pressing device 12a generates the pressing force, the one input side disk 2a acts on the cam plate 13 in the axial direction and the rotational direction by an amount corresponding to the pressing force (the torque). Relative displacement.

Moreover, the toroidal type continuously variable transmission of this example is provided with the first to third encoders 19 to 21 and the first to third sensors 22 to 24.
Among them, the first encoder 19 is provided on the outer peripheral portion of the cam plate 13 concentrically with the cam plate 13 and integrally with the cam plate 13. The second encoder 20 is provided on the outer peripheral portion of the one input side disc 2a concentric with the one input side disc 2a and integrally with the one input side disc 2a. The third encoder 21 is provided on an outer peripheral portion of one (left in FIG. 1) output side disc 5a concentrically with the one output side disc 5a and integrally with the one output side disc 5a. It is done. In the case of this example, these first to third encoders 19 to 21 are target members (the cam plate 13, the one input side disc 2a, the one output side disc 5a, each of which is a magnetic material such as magnetic steel). On the outer peripheral surface of), a plurality of recesses and protrusions are formed alternately at equal pitches in the circumferential direction. That is, the outer peripheral part of each of these object members is shape | molded in uneven | corrugated shape like a gear. Thereby, the magnetic characteristics of the outer peripheral surface (the detected portions of the first to third encoders 19 to 21) of the target members (12, 2a, 5a) are alternately changed at equal pitches in the circumferential direction. ing. Further, in the case of the present embodiment, the number of times of change of the magnetic characteristics per one rotation is made equal among the detected portions of the first to third encoders 19 to 21.

  Further, the first sensor 22 is supported and fixed to a casing 25 which is a portion which does not rotate even in use in a state where its own detection portion is opposed to the detected portion of the first encoder 19 in the radial direction. . Further, the second sensor 23 is supported and fixed to the casing 25 in a state where its own detection portion is opposed to the detected portion of the second encoder 20 in the radial direction. Further, the third sensor 24 is supported and fixed to the casing 25 in a state where its own detection portion is opposed to the detected portion of the third encoder 21 in the radial direction. In this state, each of the first to third sensors 22 to 24 corresponds to a change in magnetic characteristics of a portion of the detected portions of the first to third encoders 19 to 21 facing its own detection unit. Change the output signal. For this reason, inexpensive electromagnetic pick-up type rotation sensors as the first to third sensors 22 to 24, Hall elements, Hall ICs, MR elements (including GMR elements, TMR elements, and AMR elements) in the detection unit are included, respectively. Etc. and a permanent magnet are used. In the case of this example, the one input side disc 2a and the first encoder 19 are displaced in the axial direction according to the change of the pressing force generated by the pressing device 12a. For this reason, even when such a displacement occurs, the radially opposed state of the detected portion of the first encoder 19 and the detection portion of the first sensor 22 is maintained (the output of the first sensor 22 The dimensions of each part are regulated so that the strength does not decrease excessively. Further, the output signals of the first to third sensors 22 to 24 can be transmitted to a computing unit (not shown) through a harness drawn one by one from each of the first to third sensors 22 to 24. .

  In the case of this example, when one of the pair of pulse signals which are output signals of the first and second sensors 22 and 23 is A phase and the other is B phase, the drive is performed. The phase difference θ between the A phase and the B phase in the neutral state in which no torque is input from the shaft 11 to the cam plate 13 is 0 (electrical angle) as shown in FIG. rad) is set to 0 (degrees). However, when implementing the present invention, the phase difference θ in the neutral state can also be set to a value other than 0 {eg, π (rad) = 180 (degrees) in electrical angle}. In any case, in the case of this example, in order to set the phase difference θ in such a neutral state, the first and second sensors 22 and 23 and the first and second encoders 19, It regulates the configuration and relative position of 20.

  In the case of the toroidal-type continuously variable transmission of this example having the above-mentioned configuration, the period (and frequency) of the output signal of the second sensor 23 corresponds to the rotational speed of the one input disc 2a during operation. Change. Further, the period (and frequency) of the output signal of the third sensor 24 changes in accordance with the rotational speed of the one output side disk 5a. Therefore, based on the periods (or frequencies) of the output signals of the second and third sensors 23 and 24 {e.g., by calculating the ratio between these two periods (or frequencies)}, the input side, the output It is possible to measure (calculate) the transmission ratio R between the two side disks (2a, 2), (5a, 5).

  Further, when torque T is input from the drive shaft 11 to the cam plate 13, the first encoder 19 provided on the outer peripheral portion of the cam plate 13 and the outer peripheral portion of the one input side disc 2a. When the second encoder 20 provided is relatively displaced in the rotational direction, the phase difference θ changes, for example, in the order of (a) → (b) in FIG. 3. Here, the phase difference ratio == θ / φ, which is the ratio of the phase difference θ to the pulse period φ of the A phase, takes a value commensurate with the torque T (the relative displacement in the rotational direction). That is, there is a predetermined correlation between the phase difference ratio ν and the torque T. However, as shown in FIG. 4, this correlation differs depending on the transmission ratio R between the input and output disks (2a, 2) and (5a, 5). . In FIG. 4, solid line A indicates the correlation when the gear ratio R is 1 (equal speed), and broken line B indicates a certain value of the gear ratio R less than 1 (deceleration region) The dashed-dotted line C shows the correlation in the case where the transmission ratio R takes a certain value greater than 1 (in the speed increasing region). Therefore, in the case of the present example, if the correlation that is different for each of the gear ratios R is examined in advance, it is possible to use the gear ratio R and the phase difference ratio し て, The torque T can be obtained. Note that the processing unit performs processing for obtaining the transmission ratio R and the torque T.

  According to the toroidal continuously variable transmission of the present embodiment as described above, it is possible to easily ensure the measurement sensitivity of the passing torque (= the torque T) of the toroidal continuously variable transmission. That is, in the case of this example, the rotational directions of the first encoder 19 provided on the outer peripheral portion of the cam plate 13 and the second encoder 20 provided on the outer peripheral portion of the one input side disc 2a. Relative displacement is detected as a phase difference ratio .nu. Between the output signals of the first and second sensors 22, 23, and based on the phase difference ratio .nu. And the transmission ratio R, the passing torque is detected. Can be measured. In particular, in the case of this example, compared with two axial positions of the torque transmission shaft (for example, the middle portion and the end portion of the hollow rotation shaft in the conventional structure described in the above-mentioned Patent Document 1), The first and second encoders 19 and 20 are provided on the outer peripheral portions of the cam plate 13 and the one input side disc 2a, which increase the relative displacement amount in the rotational direction per unit passing torque. There is. Therefore, the measurement sensitivity of the passing torque can be easily ensured. As a result, when configuring the continuously variable transmission by combining the toroidal continuously variable transmission of this embodiment and a gear type differential unit such as a planetary gear mechanism, optimization of various controls (for example, clutch engagement force control) It becomes feasible, and it is effective for downsizing (improvement of fuel efficiency by reducing pump loss) due to reduction of capacity of hydraulic pump, and weight reduction (improvement of fuel consumption) by optimization of design of each part (shortening of shaft dimensions, reduction of gear diameter, etc.) It can be effective.

  In the case of this embodiment, the first encoder 19 is mounted on the outer peripheral portion of the cam plate 13 and the outer peripheral portion of the one input side disc 2a, which respectively serve as the outer peripheral portion of the toroidal type continuously variable transmission. The two encoders 20 are provided, and the first and second sensors 22 and 23 are provided at portions facing from the radially outer side to the detected portions of the first and second encoders 19 and 20, respectively. Is adopted. For this reason, as in the conventional structure described in the above-mentioned Patent Document 1, the first and second encoders and the first and second sensors are installed at the radial center portion of the toroidal type continuously variable transmission. As compared with the case where the configuration is adopted, the installation space for the first and second encoders 19 and 20 and the first and second sensors 22 and 23 is secured, and the first and second sensors 22 and 23 are provided. The arrangement of the harness drawn from each of the above can be easily performed.

  Further, in the case of the present embodiment, a position where the first and second sensors 22 and 23 are close to each other (a radial direction outer side of the pressing device 12a provided at one axial end of the toroidal type continuously variable transmission Also, from this point of view, the harnesses drawn from the first and second sensors 22 and 23 can be easily disposed.

  Furthermore, in the case of this example, the second encoder 20 and the second sensor 23 are used for both the measurement of the transmission ratio R and the measurement of the torque T. Therefore, the number of encoders and sensors to be installed can be reduced by this amount, which contributes to the cost reduction of the toroidal type continuously variable transmission.

Second Example of Embodiment
A second example of the embodiment of the present invention will be described with reference to FIG.
In the case of this example, the single sensor unit 27 is configured by embedding the first sensor 22a and the second sensor 23a in the sensor holder 26 made of synthetic resin. Then, in a state where the detection portion of the first sensor 22a is opposed to the detection portion of the first encoder 19, and the detection portion of the second sensor 23a is opposed to the detection portion of the second encoder 20 in the radial direction. The sensor unit 27 is supported and fixed to the casing 25.
In the case of this example having such a configuration, since the first and second sensors 22a and 23a are supported and fixed to the casing 25 as a single sensor unit 27, the casing 25 may be deformed. Unnecessary change of the retardation ratio 変 化 can be prevented from occurring. Therefore, the reliability of measurement of passing torque can be improved. Further, since the harnesses of the first and second sensors 22a and 23a can be put together into one and pulled out from the sensor unit 27, the arrangement of the harness can be more easily performed.
The other configurations and functions are the same as those of the first example of the embodiment described above.

In the case of practicing the present invention, the first to third encoders support and fix an object made separately from the target member (cam plate, input side disk, output side disk, etc.) to the target member. The configuration can also be adopted.
Further, the first encoder or the second encoder can be provided on a member (for example, a holder holding each rolling element) which revolves in synchronization with each rolling element constituting the pressing device.
Also, the third encoder can be provided in another part (the other output side disk, output gear, etc.) that rotates in synchronization with one output side disk.
Also, to measure the transmission ratio between the input and output disks, any conventionally known method that does not use the second and third encoders and the second and third sensors is adopted. You can also. In this case, the third encoder and the third sensor can be omitted.
Further, the toroidal type continuously variable transmission of the present invention is not limited to the half toroidal type, but can be a full toroidal type. Furthermore, the toroidal type continuously variable transmission of the present invention can be implemented regardless of whether it is a double cavity type or a single cavity type.

Reference Signs List 1 input shaft 2, 2a input side disk 3 ball spline 4 output gear 5, 5a output side disk 6 power roller 7 trunnion 8 support shaft 9 pivot shaft 10 actuator 11 drive shaft 12, 12a pressing device 13 cam plate 14 retainer 15 roller 16 Rolling bearing 17 Drive side cam surface 18 Driven side cam surface 19 First encoder 20 Second encoder 21 Third encoder 22, 22a First sensor 23, 23a Second sensor 24 Third sensor 25 Casing 26 Sensor holder 27 Sensor unit

Claims (1)

An input-side disc and an output-side disc which are disposed coaxially with each other and with their inner side faces facing each other so as to allow relative rotation freely,
A plurality of power rollers sandwiched between the input and output disks;
A plurality of support members rotatably supporting the respective power rollers;
An actuator for displacing each of the support members to change a gear ratio between the input and output disks;
A pressing device for pressing both the input and output disks in a direction in which they approach each other in the axial direction;
The pressing device includes a driven cam surface as unevenness in the circumferential direction provided on the outer surface of the input side disc, and an inner side surface facing the driven cam surface in the axial direction as unevenness in the circumferential direction. And a cam plate coaxially with the input side disc and freely provided with relative displacement in the rotational direction relative to the input side disc, the drive side cam surface and the driven side cam surface, and Of a loading cam type, with a plurality of rolling elements sandwiched between
A toroidal type continuously variable transmission,
Select from the cam plate or a member rotating in synchronization with the cam plate, the input side disk or a member rotating in synchronization with the input side disk, and a member rotating in synchronization with the rolling elements A first encoder provided on one of the two target members and having the characteristics of its detected portion alternately changed in the circumferential direction;
A second encoder provided on the other target member of the two target members and having the characteristics of its own detected portion alternately changed in the circumferential direction;
In a state in which the detection portion of the first encoder is opposed to the detection portion of the first encoder, the portion is supported by a portion that does not rotate even in use, and a portion of the detection portion of the first encoder with the detection portion opposed A first sensor that changes an output signal in response to a change in the characteristic of
In a state in which the detection portion of the second encoder is opposed to the detection portion of the second encoder, the portion is supported by a portion that does not rotate even in use, and a portion of the detection portion of the second encoder with the detection portion opposed A second sensor that changes the output signal in response to the characteristic change of
It is characterized in that the torque input to the cam plate can be measured based on the phase difference between the output signals of the first and second sensors and the transmission ratio.
Toroidal continuously variable transmission.

Images