JP2016038304A - Rotation transmission device with torque measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize structure of a rotation transmission device with a torque measurement device capable of sufficiently securing the measurement accuracy of torque.SOLUTION: A torque transmission shaft 5 is rotatably supported by a pair of rolling bearings 6a, 6b with respect to housing, and first and second encoders 7, 8 are provided on both shaft direction-ends of the torque transmission shaft 5 while the rolling bearings 6a, 6b are adjacent to each other. In addition, respective detection parts of first and second sensors 9, 10 supported by the housing are made to respectively face first and second detected surfaces 15, 16 provided on outer peripheral surfaces of the first and second encoders 7, 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an improvement in a rotation transmission device with a torque measuring device that is incorporated into, for example, an automatic transmission for an automobile, and transmits torque and is used to measure the magnitude of the transmitted torque.

  The rotational speed of the shaft that constitutes the automatic transmission for automobiles and the magnitude of torque transmitted by this shaft are measured, and the measurement results are used as information for performing shift control of the transmission or engine output control. It has been used for a long time. Conventionally, as an apparatus that can be used to measure the magnitude of torque, the amount of elastic torsional deformation of the shaft is converted into the phase difference between the output signals of a pair of sensors, and the torque is converted based on this phase difference. An apparatus for measuring the size is known (see, for example, Patent Document 1). Such a conventional structure will be described with reference to FIG.

  In the case of the conventional structure shown in FIG. 3, a pair of encoders 2 and 2 are fitted and fixed at two positions in the axial direction of the torque transmission shaft 1 that transmits torque during operation. The magnetic characteristics of the detected surfaces provided on the outer peripheral surfaces of both encoders 2 and 2 change alternately and at equal pitches in the circumferential direction. Further, the pitches at which the magnetic characteristics of the two detection surfaces change in the circumferential direction are equal to each other on the two detection surfaces. The two sensors 3 and 3 are supported by a housing (not shown) in a state where the detection portions of the pair of sensors 3 and 3 are opposed to both the detection surfaces. These sensors 3 and 3 change their output signals in response to changes in the magnetic characteristics of the portions where their detection portions are opposed to each other.

  The output signals of the sensors 3 and 3 as described above periodically change as the encoders 2 and 2 rotate together with the torque transmission shaft 1. The frequency (and period) of this change takes a value commensurate with the rotational speed of the torque transmission shaft 1. For this reason, this rotational speed is calculated | required based on this frequency (or period). In addition, when the torque transmission shaft 1 is elastically twisted and deformed as the torque is transmitted by the torque transmission shaft 1, the encoders 2 and 2 are relatively displaced in the rotational direction. As a result, the phase difference ratio (= phase difference / 1 period) between the output signals of the sensors 3, 3 changes. The phase difference ratio takes a value commensurate with the torque (the elastic torsional deformation amount of the torque transmission shaft 1). Therefore, the torque can be obtained based on this phase difference ratio.

  However, the Patent Document 1 does not disclose a specific support structure for the torque transmission shaft 1 with respect to the housing with respect to a rotation transmission device with a torque measuring device having a conventional structure. For this reason, for example, it can be considered that the torque transmission shaft 1 is rotatably supported by the sliding bearing with respect to the housing. However, when such a configuration is adopted, a torque loss applied to the torque transmission shaft 1 is caused by friction loss due to the sliding bearing, and the measurement accuracy of the torque is deteriorated. Further, Patent Document 1 does not disclose any specific configuration (material, presence / absence of heat treatment, etc.) of the torque transmission shaft 1. For this reason, for example, when used for an application in which torsional stress is repeatedly applied to the torque transmission shaft 1 such as a transmission for an automobile, there is a possibility that a problem occurs in durability of the torque transmission shaft 1.

Japanese Unexamined Patent Publication No. 63-82330

  The present invention has been invented in order to realize a structure of a rotation transmission device with a torque measuring device that can sufficiently ensure the accuracy of torque measurement in view of the circumstances as described above.

The rotation transmission device with a torque measuring device of the present invention includes a torque transmission shaft, a pair of encoders, and a pair of sensors.
Of these, the torque transmission shaft is rotatably supported by a portion such as a housing that does not rotate during use, and transmits torque during use.
The pair of encoders are obtained by alternately changing the characteristics of the respective detection surfaces in the circumferential direction, and directly or other members are placed at two positions separated in the axial direction of the torque transmission shaft. Each is indirectly supported.
The pair of sensors is supported by a portion that does not rotate even when in use, and each detection portion is opposed to the detection surface of each encoder, for example, in the radial direction (or axial direction).
The rotation transmission device with a torque measuring device according to the present invention is capable of measuring the torque applied to the torque transmission shaft based on the phase difference (phase difference ratio) between the output signals of the two sensors.

In particular, in the rotation transmission device with a torque measuring device of the present invention, the torque transmission shaft is rotatably supported by one or a plurality of rolling bearings with respect to a portion that does not rotate during the use.
In addition, at least one of the encoders is disposed at a position adjacent to the rolling bearing.

  When the rotation transmission device with a torque measuring device of the present invention as described above is implemented, for example, as in the invention described in claim 2, an encoder disposed at a position adjacent to the rolling bearing is connected to the torque transmission device. The sensor is supported on the inner ring constituting the rolling bearing that is externally fitted and fixed to the shaft, or the sensor whose detection portion faces the detection surface of the encoder is supported by a portion that does not rotate even when used. It is supported by the outer ring constituting the rolling bearing.

  In carrying out the present invention, the torque transmission shaft is subjected to surface treatment (quenching, tempering treatment, etc.), for example, so that the surface hardness is HV400 or more and the surface carbon concentration is 0.2. It is preferable to set it as weight% or more.

  Further, when the present invention is implemented, for example, the encoder is made of a permanent magnet, and the portion magnetized to the S pole and the portion magnetized to the N pole are alternately arranged in the circumferential direction on the detected surface of the encoder. In addition, the encoder can be made of a simple magnetic metal, and a configuration in which through holes (or concave portions) and column portions (or convex portions) are alternately provided in the circumferential direction on the detection surface of the encoder can be adopted. . Also, if the encoder is made of magnetic metal and has a structure in which a through hole (or recess) and a column (or protrusion) are provided on the surface to be detected, a permanent magnet is installed on the sensor side combined with such an encoder. Include.

Further, when implementing the present invention, the position (formation position, installation position) of the input part for inputting torque to the torque transmission shaft is not particularly limited, and for example, it can be provided at one end part in the axial direction, It can also be provided in the axially intermediate portion or the other axial end portion. As the input portion, for example, a spline portion (male spline portion or female spline portion), a key engagement portion, a fitting surface portion, and a screw portion are directly formed on the outer peripheral surface or inner peripheral surface of the torque transmission shaft. In addition, a configuration in which an input gear, an input pulley, an input sprocket, and the like are provided integrally with the torque transmission shaft or coupled and fixed separately can be employed.
Similarly, the position (formation position, installation position) of the output part for outputting torque from the torque transmission shaft is not particularly limited, and can be provided at one end part in the axial direction, Or it can also provide in an axial direction other end part. As the output portion, for example, a spline portion (male spline portion or female spline portion), a key engagement portion, a fitting surface portion, and a screw portion are directly formed on the outer peripheral surface or inner peripheral surface of the torque transmission shaft. In addition, a configuration in which an output gear, an output pulley, an output sprocket, and the like are provided integrally with the torque transmission shaft or coupled and fixed separately can be employed. The torque transmission shaft may be provided with a plurality of output portions. In this case, for example, a plurality of output gears having different numbers of teeth may be provided, or different types of output portions (for example, an output pulley and an output). Gears, etc.) can be provided.

Further, when carrying out the present invention, as a rolling bearing for rotatably supporting the torque transmission shaft with respect to a portion that does not rotate even when using a housing or the like, for example, a ball bearing such as a deep groove type or an angular type, Tapered roller bearings, cylindrical roller bearings, radial needle bearings, and self-aligning roller bearings can be used. In addition, when using a plurality of bearings, different types of bearings can be employed. For example, a portion between the torque input portion and the output portion of the axial intermediate portion of the torque transmission shaft can be used. , Can be supported rotatably.
Moreover, when implementing this invention, the said torque transmission shaft can be made into a solid or hollow shape (hollow cylinder shape), for example. Further, the rotary shaft of the power source that inputs torque to the torque transmission shaft can be arranged coaxially, parallel, or at a right angle to the torque transmission shaft.

According to the rotation transmission device with a torque measuring device of the present invention configured as described above, it is possible to realize a structure that can sufficiently ensure the accuracy of torque measurement.
That is, in the case of the present invention, since a rolling bearing is used as a bearing for rotatably supporting the torque transmission shaft in a portion that does not rotate even in use, for example, compared to a case where a sliding bearing is used, Friction loss generated at the bearing can be reduced. For this reason, it is possible to prevent the torque applied to the torque transmission shaft from decreasing, and to ensure the accuracy of torque measurement.
In the case of the present invention, since at least one encoder is disposed at a position adjacent to the rolling bearing, the displacement amount of the encoder in the radial direction can be reduced. For this reason, it is possible to suppress fluctuations in the air gap (opposite spacing) between the detected surface of the encoder and the detection portion of the sensor, and it becomes easy to ensure sufficient torque measurement accuracy.

  Further, in the case of the invention described in claim 2, since the air gap fluctuation between the encoder and the sensor can be effectively suppressed, the torque measurement accuracy can be improved.

  Further, regarding the torque transmission shaft, if the surface hardness is HV400 or more and the surface carbon concentration is 0.2% by weight or more, the durability of the torque transmission shaft can be improved. In particular, it can be preferably applied to applications requiring durability.

  Further, if the torque transmission shaft is solid, it is advantageous in securing the strength of the torque transmission shaft. On the other hand, if the torque transmission shaft is hollow, a large displacement amount (elastic torsional deformation amount) in the circumferential direction of the torque transmission shaft can be secured, so that the torque measurement accuracy can be further improved. .

The cross-sectional schematic diagram of the rotation transmission apparatus with a torque measuring device which shows the 1st example of embodiment of this invention. The figure similar to FIG. 1 which shows a 2nd example similarly. The schematic side view which shows an example of the rotation transmission apparatus with a torque measuring device of a conventional structure.

[First example of embodiment]
A first example of the embodiment of the present invention will be described with reference to FIG. The rotation transmission device 4 with the torque measuring device of this example is used by being incorporated in, for example, an automatic transmission for an automobile. Such a rotation transmission device 4 with a torque measuring device includes a housing (mission case) (not shown), a hollow torque transmission shaft 5 that functions as an input shaft (or counter shaft) such as a belt type CVT, and a pair of rolling elements. Bearings 6 a and 6 b, a first encoder 7, a second encoder 8, a first sensor 9, and a second sensor 10 are provided.

  The torque transmission shaft 5 is made of an alloy steel such as carbon steel in a hollow cylindrical shape, and the axially intermediate end portions of the torque transmission shaft 5 are rotatable with respect to the housing by the rolling bearings 6a and 6b. It is supported. For this reason, in the case of this example, the torque transmission shaft 5 has a both-end support structure. The torque transmission shaft 5 is subjected to heat treatment such as carbonitriding, quenching, and tempering so that the surface hardness of the torque transmission shaft 5 is HV400 or more and the surface carbon concentration is 0.2% by weight. That's it. The torque transmission shaft 5 is provided with a torque input section and a torque output section (not shown) at positions separated from each other in the axial direction.

  As a specific structure of the torque input portion, for example, a spline portion (male spline portion or female spline portion), a key engagement portion, a fitting surface portion, and a screw are provided on the outer peripheral surface or inner peripheral surface of the torque transmission shaft 5. In addition to the configuration in which the portion is formed directly, a configuration in which an input gear, an input pulley, an input sprocket, and the like are provided integrally with the torque transmission shaft or coupled and fixed separately can be employed. Further, as a specific structure of the torque output portion, a spline portion (male spline portion or female spline portion), a key engagement portion, a fitting surface portion, a screw portion on the outer peripheral surface or inner peripheral surface of the torque transmission shaft In addition, a configuration in which an output gear, an output pulley, an output sprocket, and the like are provided integrally with the torque transmission shaft or coupled and fixed separately can be employed. It is also possible to provide a plurality of output units. In this case, for example, a plurality of output gears having different numbers of teeth or a different type of output unit (for example, an output pulley and an output gear) may be provided. it can.

  The double rolling bearings 6a and 6b are, for example, deep groove type and angular type ball bearings, tapered roller bearings, cylindrical roller bearings, radial needle bearings, self-aligning roller bearings and the like (in the illustrated example, deep groove type ball bearings). Each of which is composed of an annular outer ring and an inner ring, and a plurality of rolling elements. Of these, the outer rings are respectively fitted and fixed to the housing, and the inner rings are respectively fitted and fixed to portions near both ends of the intermediate portion of the torque transmission shaft 6 in the axial direction. Each rolling element is provided between the outer ring raceway formed on the inner peripheral surface of the outer ring and the inner ring raceway formed on the outer peripheral surface of the inner ring so as to be able to roll while being held by a cage. It has been. In the case of this example, the two rolling bearings 6a and 6b have opposite contact angles.

  The first encoder 7 is fixed to one end of the torque transmission shaft 5 in the axial direction. For this reason, the first encoder 7 can rotate (synchronously) together with one end of the torque transmission shaft 5 in the axial direction. On the other hand, the second encoder 8 is fixed to the other axial end portion of the torque transmission shaft 5. For this reason, the second encoder 8 can rotate (synchronously) with the other axial end of the torque transmission shaft 5. The first and second encoders 7 and 8 are supported by and fixed to the axial ends of the torque transmission shaft 5 and are circular crank-shaped support rings 11 and 12 made of a magnetic metal plate. And encoder bodies 13, 14 made of cylindrical permanent magnets fixed to the outer peripheral surfaces of the support rings 11, 12.

  Examples of magnetic powders contained in the encoder bodies 13 and 14 include ferrite-based magnetic powders such as strontium ferrite and barium ferrite, and rare earth elements such as samarium-iron, samarium-cobalt, and neodymium-iron-boron. Magnetic powder can be used. The outer peripheral surface of the encoder body 13 constituting the first encoder 7 is defined as a first detected surface 15, and the outer peripheral surface of the encoder body 14 constituting the second encoder 8 is defined as a second detected surface 16. It is said. The first and second detected surfaces 15 and 16 have the same diameter and are arranged concentrically with each other. Further, on both the first and second detected surfaces 15 and 16, S poles and N poles are alternately arranged at equal pitches in the circumferential direction, and the magnetic characteristics are alternately changed in the circumferential direction. And at an equal pitch. The total number of magnetic poles (S poles and N poles) of the first and second detected surfaces 15 and 16 coincide with each other. The first encoder is an inner ring constituting a rolling bearing 6a that supports a portion of the torque transmission shaft 5 closer to one end in the axial direction instead of a structure that is directly supported and fixed to one end in the axial direction of the torque transmission shaft 5. A structure for supporting and fixing to the substrate may be adopted. Similarly, instead of a structure in which the second encoder is directly supported and fixed to the other axial end portion of the torque transmission shaft 5, a rolling bearing 6b that supports a portion near the other axial end portion of the torque transmission shaft 5 is provided. You may employ | adopt the structure supported and fixed to the inner ring to comprise.

  The first and second sensors 9, 10 are made of synthetic resin holders 17, 18, sensor bodies 19, 20 embedded (held) at the tips of the holders 17, 18, and a harness 21, respectively. , 22 and supported and fixed to the housing. Magnetic detectors such as Hall elements, Hall ICs, MR elements (including GMR elements, TMR elements, and AMR elements) are included in the respective detection units (first and second detection units) constituting the sensor bodies 19 and 20. In the state where the elements are incorporated and the holders 17 and 18 are supported and fixed to the housing, the detection unit (first detection unit) of the first sensor 9 is connected to the first detection surface 15 and the second detection unit 15 The detection part (second detection part) of the sensor 10 is made to face and oppose to the second detected surface 16 through a minute gap in the radial direction. For this reason, the first sensor 9 changes the output signal in response to a change in the magnetic characteristics of the first detected surface 15, and the second sensor 10 changes the magnetic characteristics of the second detected surface 16. Correspondingly, the output signal is changed. In the case of this example, the output signals of the first and second sensors 9 and 10 are transmitted through harnesses 21 and 22 to arithmetic units (not shown). The first sensor may adopt a structure in which the first sensor is supported and fixed to the outer ring constituting the rolling bearing 6a instead of the structure that is supported and fixed to the housing. Similarly, instead of the structure in which the second sensor is supported and fixed to the housing, a structure in which the second sensor is supported and fixed to the outer ring constituting the rolling bearing 6b may be employed.

  In the case of the rotation transmission device 4 with the torque measuring device of this example having the above-described configuration, the output signals of both the first and second sensors 9 and 10 together with the torque transmission shaft 5 are the first and second encoders. As 7 and 8 rotate, each changes periodically. Here, the frequency (and period) of this change takes a value commensurate with the rotational speed of the torque transmission shaft 5. Therefore, if the relationship between these frequencies (or periods) and the rotational speed is examined in advance, the rotational speed can be obtained based on the frequencies (or periods). When torque is transmitted by the torque transmission shaft 5, the portion between the torque input portion and the torque output portion is elastically twisted and deformed, so that the axial direction of the torque transmission shaft 5 is increased. Both ends (first and second encoders 7 and 8) are relatively displaced in the rotational direction. As a result of the relative displacement of the first and second encoders 7 and 8 in the rotational direction in this way, the phase difference ratio between the output signals of the first and second sensors 9 and 10 (= phase difference). / 1 period) changes. Here, this phase difference ratio takes a value commensurate with the torque. Therefore, if the relationship between the phase difference ratio and the torque is examined in advance, the torque can be obtained based on the phase difference ratio.

In particular, according to the rotation transmission device 4 with the torque measuring device of this example, it is possible to ensure a good measurement accuracy of the torque.
That is, in this example, since a pair of rolling bearings 6a and 6b are used as bearings for rotatably supporting the torque transmission shaft 5 on the housing, for example, sliding bearings are used. Compared with the case where it supports, the friction loss which arises in a bearing part can be reduced. For this reason, it is possible to prevent the torque applied to the torque transmission shaft 5 from decreasing, and to ensure the accuracy of torque measurement.
In the case of this example, the first and second encoders 7 and 8 are arranged at positions adjacent to the respective rolling bearings 6a and 6b that rotatably support the torque transmission shaft 5. For this reason, the detected surfaces (first and second detected surfaces 15 and 16) of the first and second encoders 7 and 8 and the detecting portions (first of the first and second sensors 9 and 10) It is possible to suppress fluctuations in the air gap with the second detection unit), and it becomes easy to ensure sufficient torque measurement accuracy.

Further, in the case of this example, the surface hardness of the torque transmission shaft 5 is set to HV400 or more and the surface carbon concentration is set to 0.2% by weight or more. Therefore, the durability of the torque transmission shaft 5 is improved. I can plan. Therefore, the rotation support device 4 with the torque measuring device of the present example can be preferably applied to applications such as automobiles and wind power generators that require particularly durability.
Further, since the first and second sensors 9 and 10 are respectively supported and fixed to the housing, when the housing is deformed, the first and second sensors 9 and 10 are connected to the first and second sensors. Since the encoders 7 and 8 are displaced in the same direction, the influence of the deformation of the housing on the torque detection accuracy can be reduced. Further, since the first and second encoders 7 and 8 are directly supported and fixed to the torque transmission shaft 5, for example, the first and second encoders 7 and 8 are connected to the rolling bearings 6a. , 6b, the support rings 11 and 12 can be downsized, which is advantageous in reducing the manufacturing cost.

[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, torque is transmitted to the torque transmission shaft 5a from the intermediate shaft 23 arranged in parallel with the torque transmission shaft 5a. For this purpose, a belt-type input pulley 24, which is an input portion for inputting torque, is fixed to the other end portion of the torque transmission shaft 5a in the axial direction, and the shaft of the torque transmission shaft 5a is fixed. An output gear 25, which is an output unit for outputting torque, is fixed to one end side portion of the direction intermediate part. The intermediate shaft 23 is rotatably supported by a pair of rolling bearings 26a and 26b with respect to a housing (not shown), and an output pulley 27 fixed to an intermediate portion in the axial direction of the intermediate shaft 23, the input pulley 24, The belt 28 is stretched between the two. In the case of this example, the torque transmission shaft 5a includes both side portions (the other end in the axial direction and one end in the axial direction) sandwiching the portion where the input pulley 24 and the output gear 25 are installed. A pair of rolling bearings 6a and 6b are rotatably supported with respect to the housing. The output gear 25 can be a spur gear or a helical gear.

  Further, in the case of this example, the support ring 11a constituting the first encoder 7a is supported and fixed to the inner ring constituting the rolling bearing 6a, and the support ring 12a constituting the second encoder 8a is fixed to the rolling bearing. It is supported and fixed to the inner ring constituting 6b. In the case of this example as well, the first sensor 9 in which the detection portion (first detection portion) is opposed to the outer peripheral surface (first detection surface 15a) of the encoder body 13 constituting the first encoder 7a. Is supported and fixed to the housing, and the detection unit (second detection unit) is opposed to the outer peripheral surface (second detection surface 16a) of the encoder body 14 constituting the second encoder 8a. 10 is supported and fixed to the housing.

In the case of this example having the above-described configuration, the first and second encoders 7a and 8a are smaller in size and lighter in weight than the torque transmission shaft 5a. Each is attached to an inner ring constituting 6b. For this reason, compared with the case where the first and second encoders 7a and 8a are directly attached to the torque transmission shaft 5a, the attachment workability of the first and second encoders 7a and 8a can be improved. Further, the detected surfaces (first and second detected surfaces 15a and 16a) of the first and second encoders 7a and 8a and the detecting portions (first and second sensors 9 and 10) of the first and second sensors 9 and 10 are used. It is possible to suppress fluctuations in the air gap with the second detection unit), and it becomes easy to ensure sufficient torque measurement accuracy. In the case of this example, the first and second sensors 9 and 10 are supported and fixed to the housing. However, they may be supported and fixed to the outer rings constituting the rolling bearings 6a and 6b. . If such a configuration is adopted, the detection parts of the first and second sensors 9, 10 and the detected surfaces of the first and second encoders 7a, 8a (first and second detected surfaces). It becomes possible to manage the air gap in the radial direction with respect to 15a, 16a) more strictly. The pulleys 24 and 27 may be pulleys constituting a belt type continuously variable transmission.
About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

  In each example of the above-described embodiment, the torque transmission shaft has been described as an example of a structure in which the torque transmission shaft is rotatably supported using a pair of rolling bearings with respect to a housing that does not rotate during use. In carrying out the above, the number of rolling bearings for rotatably supporting the torque transmission shaft is not limited to two, but may be one or three or more. Furthermore, in each example of the above-described embodiment, a configuration is adopted in which the encoder is made of a permanent magnet, and N poles and S poles are alternately arranged on the detected surface of the encoder in the circumferential direction. ing. However, the encoder is made of a simple magnetic material, and a solid portion such as a convex portion, a tongue piece, or a column portion on the detection surface of the encoder, and a thinned portion such as a concave portion, a notch, or a through hole, A configuration in which they are alternately arranged in the circumferential direction can also be adopted. When such a configuration is adopted, a permanent magnet is incorporated on the sensor side. Furthermore, the structures of the examples of the above-described embodiments can be implemented in appropriate combination.

  The torque transmission shaft that constitutes the rotation transmission device with the torque measuring device of the present invention is not limited to the rotation shaft that constitutes the power train of the automobile, but, for example, the rotation shaft of the windmill (main shaft, rotation shaft of the speed increasing device) Roll neck, rolling shaft of rolling stock (axle, rotating shaft of speed reducer), rotating shaft of machine tool (main shaft, rotating shaft of feed system), construction machinery / agricultural machinery / home appliance / motor rotating shaft, etc. The rotation shafts of various mechanical devices can be targeted. Further, when configuring a power train of an automobile, for example, an input shaft (turbine shaft) to which torque is input from a torque converter or a countershaft can be targeted. Further, the form of the transmission in the case of constituting the transmission by incorporating the rotation transmission device with the torque measuring device of the present invention is not particularly limited, and various continuously variable transmissions such as an automatic transmission (AT), a belt type and a toroidal type. It is possible to adopt a transmission that changes gears under the control of the vehicle, such as a machine (CVT), an automated manual transmission (AMT), a dual clutch transmission (DCT), and a transfer. The relationship between the installation position of the transmission and the drive wheels is not particularly limited, and there are front engine front wheel drive vehicles (FF vehicles), front engine rear wheel drive vehicles (FR vehicles), four wheel drive vehicles, and the like. It becomes a target. Further, the measured rotational speed and torque may be used for vehicle control other than shift control and engine output control. Further, the power source placed on the upstream side of the transmission does not necessarily need to be an internal combustion engine such as a gasoline engine or a diesel engine, and may be an electric motor used for a hybrid vehicle or an electric vehicle, for example. Further, when implementing the present invention, it is essential to measure the torque, but it is not essential to measure the rotational speed. Even if rotation speed is required, it can be measured by a separate simple structure.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Encoder 3 Sensor 4 Rotation transmission device with torque measuring device 5, 5a Torque transmitting shaft 6a, 6b Rolling bearing 7, 7a First encoder 8, 8a Second encoder 9 First sensor 10 Second sensor 11, 11a Support Ring 12, 12a Support ring 13 Encoder body 14 Encoder body 15, 15a First detected surface 16, 16a Second detected surface 17 Holder 18 Holder 19 Sensor body 20 Sensor body 21 Harness 22 Harness 23 Intermediate shaft 24 Input pulley 25 Output Gear 26a, 26b Rolling bearing 27 Output pulley

Claims (2)

A torque transmission shaft that is rotatably supported to a portion that does not rotate during use and transmits torque;
The characteristics of the respective detection surfaces that rotate together with the torque transmission shaft, which are respectively supported directly or indirectly via other members at two positions separated in the axial direction of the torque transmission shaft, with respect to the circumferential direction. A pair of alternating encoders;
A pair of sensors supported by a portion that does not rotate during use in a state in which the respective detection units are opposed to the detection surfaces of these encoders,
Based on the phase difference between the output signals of both sensors, a rotation transmission device with a torque measurement device capable of measuring the torque applied to the torque transmission shaft,
The torque transmission shaft is rotatably supported by a rolling bearing with respect to a portion that does not rotate during the use,
A rotation transmission device with a torque measuring device, wherein at least one of the encoders is disposed at a position adjacent to the rolling bearing.   An encoder disposed at a position adjacent to the rolling bearing is supported by an inner ring constituting the rolling bearing, or a sensor having a detection portion facing the detection surface of the encoder, The rotation transmission device with a torque measuring device according to claim 1, wherein the rotation transmitting device is supported by a constituting outer ring.

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