JP2015137926A - Rotation transmission device with torque measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a structure which allows improvement in attachment workability of a sensor and allows simplification of arrangement work of a harness.SOLUTION: An inner shaft 9 is disposed on the inner diameter side of a torque transmission shaft 6, and one axial end part of the inner shaft 9 is connected to one axial end part of the torque transmission shaft 6 so as not to be relatively rotatable, and the other axial end part of the inner shaft 9 is projected from an opening in the other axial end part of the torque transmission shaft 6 toward the other axial side. A first encoder 10 is attached to the other axial end part of the torque transmission shaft 6 via an inner ring 15b, and a second encoder 11 is attached to the other axial end part of the inner shaft 9 adjacently to the first encoder 10. This configuration allows detection parts of both of first and second sensors 37 and 38 held by one holder 36 to face detection object surfaces of the first and second encoders 10 and 11 respectively.

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 (for example, see Patent Documents 1 and 2). Such a conventional structure will be described with reference to FIG.

  In the case of the conventional structure shown in FIG. 10, a pair of encoders 2 and 2 are externally 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, which are the outer peripheral surfaces of the encoders 2 and 2 that are the detected portions, 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, in the case of the rotation transmission device with the torque measuring device having the conventional structure as described above, the two sensors 3 and 3 need to be attached to the housing with a relative positional relationship with high accuracy in a state of being separated in the axial direction. There is. For this reason, the mounting work of both the sensors 3 and 3 becomes troublesome. Further, since two harnesses 4 and 4 are required in total, the wiring work of these harnesses 4 and 4 becomes troublesome (the handling property becomes worse), and the cost and the weight increase.
As other prior art documents related to the present invention, there are inventions described in Patent Documents 3 to 5 in addition to Patent Documents 1 and 2 described above.

JP-A-1-254826 Japanese Unexamined Patent Publication No. 63-82330 Japanese Patent Application Laid-Open No. 60-213569 Japanese Patent Publication No. 7-18767 JP 2013-19828 A

  In view of the circumstances as described above, the present invention was invented to realize a structure that can improve the mounting workability of the sensor, simplify the wiring work of the harness, and reduce the cost and weight. is there.

A rotation transmission device with a torque measuring device of the present invention includes a torque transmission shaft, a pair of rolling bearings, an input gear and an output gear, an inner shaft, a first characteristic change member, a second characteristic change member, and a sensor. Device.
Of these, the torque transmission shaft is hollow.
The double rolling bearing is, for example, a roller bearing such as a tapered roller bearing or a ball bearing, and rotatably supports both axial end portions of the torque transmission shaft with respect to a portion that does not rotate even when a housing is used, for example. .
The input gear and the output gear are fixed to an axially intermediate portion sandwiched between the rolling bearings on the outer peripheral surface of the torque transmission shaft in a state of being separated from each other in the axial direction.
Further, the inner shaft is disposed concentrically with the torque transmission shaft on the inner diameter side of the torque transmission shaft, and one end portion in the axial direction is directly or indirectly rotated relative to one end portion in the axial direction of the torque transmission shaft. Linked impossible.
The first characteristic changing member has an annular first detected portion whose characteristic is changed in the circumferential direction, and rotates the other axial end of the torque transmission shaft among the rolling bearings. It is attached to an inner ring constituting a freely supported rolling bearing.
The second characteristic changing member has an annular second detected portion whose characteristics are changed in the circumferential direction, and the second detected portion is in a state of being close to the first detected portion ( For example, it is attached to the other axial end of the inner shaft in a state of being adjacent to each other with an interval of 10 mm or less, more preferably 5 mm or less.
Further, the sensor device can detect a phase change in the circumferential direction between the first and second detected parts and is supported by a portion that does not rotate during use. The detection part is made to oppose both detected parts.

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, the first characteristic changing member is used as the magnetic characteristic of the first detected portion. Are changed in the circumferential direction alternately and at the same pitch, and the second characteristic changing member is changed in the magnetic characteristic of the second detected portion alternately in the circumferential direction at the same pitch. This is the second encoder.
Further, the sensor device includes a first sensor that changes the output signal in response to a change in magnetic characteristics of the first detected portion with the first detecting portion facing the first detected portion, and the second sensor A second sensor that causes the second detection unit to face the detection unit and changes an output signal in response to a change in magnetic characteristics of the second detection unit; and a holder that holds both the first and second sensors A sensor unit having

Alternatively, for example, as in the invention described in claim 3, one of the first and second characteristic changing members is made of a magnetic material, and the detected portion is related to the circumferential direction. The concave / convex member for torque detection is formed into a concave / convex shape, and the other characteristic changing member is made of a non-magnetic plate and has a plurality of holes in the detected portion at equal intervals in the circumferential direction. A perforated member for torque detection is provided in a portion between the torque detecting uneven member and the sensor device in a state of overlapping in a radial direction or an axial direction with respect to a detected portion of the detecting uneven member.
The sensor device may be a coil sensor unit that includes a coil as a detection unit and changes impedance in response to a phase change in the circumferential direction between the detected units.

  Moreover, when implementing the rotation transmission device with a torque measuring device of the present invention, preferably, as in the invention described in claim 4, for example, the axial end of the inner shaft is connected to the rolling bearing of the both rolling bearings. It connects with the inner ring | wheel which comprises the rolling bearing which supported the axial direction one end part of the torque transmission shaft rotatably.

According to the rotation transmission device with a torque measuring device of the present invention configured as described above, the work of attaching the sensor can be improved, the wiring work of the harness can be simplified, and the cost and weight can be reduced.
That is, in the case of the present invention, the first detected portion of the first characteristic change member for detecting the phase of the other axial end portion of the torque transmission shaft using the inner shaft, and the torque transmission shaft The second detected portion of the second characteristic change member for detecting the phase of the one end portion in the axial direction is disposed close to each other, and one sensor device is provided on each of the first and second detected portions. The structure which makes a detection part oppose is employ | adopted. For this reason, the attachment workability | operativity of this sensor apparatus can be made favorable. Further, since the number of harnesses can be reduced from two to one, the wiring work of the harness can be simplified and the cost and weight can be reduced.
Furthermore, in the case of the present invention, since the first characteristic changing member is attached to the inner ring having a smaller size than the torque transmission shaft, the first characteristic changing member is compared with the case where the first characteristic changing member is attached to the torque transmission shaft. Installation workability can be improved.
Furthermore, in the case of the invention described in claim 4, since one end of the inner shaft in the axial direction is connected to the inner ring having a smaller size than the torque transmission shaft, compared to the case of connecting to the torque transmission shaft. The connecting workability of the inner shaft can be improved.

The AA sectional view of Drawing 2 showing the 1st example of an embodiment of the invention. The end view which looked at the rotation transmission device with a torque measuring device from the other axial end side. The figure equivalent to FIG. 1 which shows the 2nd example of embodiment of this invention. The figure corresponding to FIG. 2 similarly. The figure equivalent to FIG. 1 which shows the 3rd example of embodiment of this invention. Similarly, the end view which looked at the rotation transmission apparatus with a torque measuring device from the axial direction one end side. The perspective view which shows the 4th example of embodiment of this invention. The figure which corresponds to FIG. The figure corresponding to FIG. 2 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 FIGS. The rotation transmission device 5 with a torque measuring device of this example is used by being incorporated in, for example, a counter shaft and a counter gear portion of an automatic transmission for an automobile. Such a rotation transmission device 5 with a torque measuring device includes a housing (mission case) (not shown), a hollow (hollow cylindrical) torque transmission shaft 6 that functions as a counter shaft, and an input gear that each functions as a counter gear. 7 and an output gear 8, an inner shaft 9, a first encoder 10, a second encoder 11, one sensor unit 12, and a pair of tapered roller bearings 13a and 13b.

  The torque transmission shaft 6 is made of an alloy steel such as carbon steel in a cylindrical shape, and a pair of tapered roller bearings having axially opposite ends arranged in opposite directions with respect to the housing. It is rotatably supported by 13a and 13b.

  These tapered roller bearings 13a and 13b are respectively provided with inner rings 15a and 15b having conical convex inner ring raceways 14a and 14b on the outer peripheral surface and outer rings 17a and 17b having conical concave outer ring raceways 16a and 16b on the inner peripheral surface. And a plurality of tapered rollers 19a and 19b provided between the inner ring raceways 14a and 14b and the outer ring raceways 16a and 16b so as to be able to roll while being held by the cages 18a and 18b. Each of the inner rings 15a and 15b is adjacent to a portion of the outer ring surface adjacent to the small diameter side of each of the inner ring raceways 14a and 14b, and outward flange-shaped small flange portions 20a and 20b are also adjacent to the large diameter side. The portions have large flange portions 21a and 21b each having an outward flange shape. Of the two tapered roller bearings 13 a and 13 b having such a configuration, the inner ring 15 a constituting the tapered roller bearing 13 a disposed on one end side in the axial direction (left end side in FIG. 1) is the shaft of the torque transmission shaft 6. The outer ring 17a is fitted and fixed to the housing in the same manner. In this state, one end side portion in the axial direction of the inner ring 15a protrudes to one end side in the axial direction from the one end side small diameter step portion 22, and the end surface on the large diameter side of the inner ring 15a and the axial direction of the input gear 7 A spacer 23 is sandwiched between the one end surface. On the other hand, the inner ring 15b constituting the tapered roller bearing 13b disposed on the other end side in the axial direction (the right end side in FIG. 1) is a small diameter step portion on the other end side formed on the other end portion in the axial direction of the torque transmission shaft 6. The outer ring 17b is also fitted and fixed to the housing. In this state, the large-diameter side end surface of the inner ring 15 b is directly abutted against the other axial end surface of the output gear 8.

  Particularly in the case of this example, a support cylinder portion 25 for attaching the first encoder 10 is provided on an inner ring 15b constituting the tapered roller bearing 13b disposed on the other axial end side. Specifically, the support tube portion 25 having a smaller diameter than the small flange portion 20b and a cylindrical outer peripheral surface is provided at the other axial end of the inner ring 15b. For this reason, in the case of this example, the axial dimension of the inner ring 15b on the other end side in the axial direction is longer than the axial dimension of the inner ring 15a on the one end side in the axial direction, as much as the support cylinder portion 25 is provided. ing.

  The input gear 7 and the output gear 8 are separated from each other in the axial direction at the axially intermediate portion sandwiched between the tapered roller bearings 13a and 13b on the outer peripheral surface of the torque transmission shaft 6. It is fixed with. Specifically, the input gear 7 is a helical gear made of an alloy steel such as carbon steel, and is externally fitted and fixed to a portion closer to one end (the left end in FIG. 1) of the axial direction intermediate portion of the torque transmission shaft 6. ing. The fitting portion between the inner peripheral surface of the input gear 7 and the outer peripheral surface of the torque transmission shaft 6 is a cylindrical surface fitting portion 26 for securing concentricity (both outer diameter side and inner diameter side cylindrical surfaces are press-fitted together. A fitting portion formed by fitting) and an involute spline engaging portion 27 for preventing relative rotation are arranged adjacent to each other in the axial direction. Further, the axial positioning of the input gear 7 with respect to the torque transmission shaft 6 is performed on the other end surface in the axial direction of the input gear 7 (the right end surface in FIG. 1) on the stepped surface 28 formed on the outer peripheral surface of the torque transmission shaft 6. ) By contacting the part closer to the inner diameter. Further, the output gear 8 is a helical gear made of alloy steel such as carbon steel, and the torque is arranged at a portion closer to the other end (right end in FIG. 1) in the axial direction intermediate portion of the outer peripheral surface of the torque transmission shaft 6. It is formed (fixed) integrally with the transmission shaft 6. In the case of the illustrated structure, the torque input from the input gear 7 is output from the output gear 8 when the torque transmission shaft 6 rotates. At this time, a portion of the torque transmission shaft 6 between the gears 7 and 8 is elastically twisted and deformed.

  Further, in the case of the structure shown in the figure, the tooth inclination directions of the input gear 7 and the output gear 8 are helical gears, respectively. 8 is controlled so that the axial reaction force acting on the axial direction 8 is in a direction facing each other (pressing each other). Thereby, at the time of forward rotation of the two gears 7 and 8, at least a part of the axial reaction force acting on the two gears 7 and 8 can be canceled. Thus, the axial load applied to the tapered roller bearings 13a and 13b during the forward rotation of the gears 7 and 8 is suppressed, and the friction loss (dynamic torque) of the tapered roller bearings 13a and 13b is correspondingly reduced. ).

  The inner shaft 9 is made of an alloy steel such as carbon steel in a cylindrical shape (circular tube), and is arranged concentrically with the torque transmission shaft 6 on the inner diameter side of the torque transmission shaft 6. Further, the inner shaft 9 is connected to one end portion in the axial direction (left end portion in FIG. 1) of the torque transmission shaft 6 indirectly in a relatively non-rotatable manner and the other end portion in the axial direction. (The right end portion in FIG. 1) is projected from the other axial opening of the torque transmission shaft 6 to the other axial side. In the case of the illustrated structure, in order to connect one axial end of the inner shaft 9 to one axial end of the torque transmission shaft 6 in a relatively non-rotatable manner, The torque transmission shaft 6 is projected from one axial opening to the one axial end, and an outward flange-shaped connecting flange 29 is formed on the outer peripheral surface of the projected portion. Of the inner ring 15a that is externally fitted and fixed to the outer peripheral surface of the connecting flange portion 29 and the one end side small-diameter step portion 22 of the torque transmission shaft 6, the one end side small-diameter step portion 22 protrudes toward one end in the axial direction. The inner peripheral surface of the portion is fitted and fixed by an interference fit so as not to be relatively rotatable. In addition, in order to connect these both peripheral surfaces so that relative rotation is impossible, the engagement by an involute spline or a key can also be employ | adopted, for example. In the case of this example, a small gap is provided between the outer peripheral surface of the inner shaft 9 and the inner peripheral surface of the torque transmission shaft 6 over the entire length in the axial direction and the entire circumference. Yes. The portion between these can be filled with lubricating oil and function as a film damper.

  The first encoder 10 is externally fitted and fixed to a support cylinder portion 25 of an inner ring 15b that constitutes the tapered roller bearing 13b disposed on the other axial end side. In other words, the first encoder 10 is indirectly attached to the other axial end portion of the torque transmission shaft 6 via the inner ring 15b. For this reason, the first encoder 10 can rotate (synchronously) with the other axial end of the torque transmission shaft 6. On the other hand, the second encoder 11 is fitted and fixed to a portion (the other end in the axial direction) of the inner shaft 9 that protrudes from the other axial opening of the torque transmission shaft 6 to the other axial end. Has been. In other words, the second encoder 11 is indirectly attached to one end of the torque transmission shaft 6 in the axial direction via the inner shaft 9 (and the inner ring 15a). For this reason, the second encoder 11 can rotate (synchronously) with one axial end portion of the torque transmission shaft 6.

  Further, the first and second encoders 10 and 11 are each made of a magnetic metal and have an annular support ring 30 which is externally fitted and fixed to the support cylinder portion 25 or the other axial end portion of the inner shaft 9. 31 and cylindrical permanent magnets 32 and 33 fixed to the outer peripheral surfaces of the respective support rings 30 and 31. The outer peripheral surface of the permanent magnet 32 constituting the first encoder 10 is defined as a first detected portion 34, and the outer peripheral surface of the permanent magnet 33 constituting the second encoder 11 is defined as a second detected portion 35. It is said. The first and second detected parts 34 and 35 have the same diameter, are concentric with each other, and are adjacent to each other in the axial direction (for example, within an interval of 10 mm or less, preferably 5 mm or less in the axial direction). Open). Further, the detected parts 34 and 35 are respectively provided with S poles and N poles alternately and at equal pitches in the circumferential direction, and magnetic characteristics are alternately and equally pitched in the circumferential direction. It is changing. The total number of magnetic poles (S poles and N poles) of the detected parts 34 and 35 coincides with each other.

  A female screw is formed on the inner peripheral surface of the support ring constituting the second encoder, and this female screw is screwed to a male screw portion formed at the other axial end of the inner shaft, so that the second encoder is attached to the inner shaft. You may attach to an axial direction other end part.

  The sensor unit 12 includes a synthetic resin holder 36, first and second sensors 37 and 38 embedded (held) in a state adjacent to the tip of the holder 36 in the axial direction, and one sensor unit 12. The harness 39 is provided. Magnetic elements such as Hall elements, Hall ICs, MR elements (including GMR elements and TMR elements) are included in the detection units (first detection unit and second detection unit) of the first and second sensors 37 and 38, respectively. In the state where the detection element is incorporated and the holder 36 is supported and fixed to the housing, the first detection part of the first sensor 37 is connected to the first detection part 34 and the second sensor 38. The second detection part is made to approach and oppose the second detected part 35, respectively. For this reason, the first sensor 37 changes the output signal corresponding to the change in the magnetic characteristics of the first detected part 34, and the second sensor 38 changes the magnetic characteristic of the second detected part 35. Correspondingly, the output signal is changed. In the case of this example, the output signals of the first and second sensors 37 and 38 are transmitted to a calculator (not shown) through one harness 39 drawn in the axial direction. In the case of the structure shown in the figure, the holder 36 is fixed to the housing by screws using an attachment hole 40 formed in the holder 36.

  Also in the case of the rotation transmission device 5 with the torque measuring device of the present example having the above-described configuration, the output signals of the first and second sensors 37 and 38 constituting the sensor unit 12 are transmitted to the torque transmission shaft 6. At the same time, the first and second encoders 10 and 11 change periodically as they rotate. Here, the frequency (and period) of this change takes a value commensurate with the rotational speed of the torque transmission shaft 6. 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). Further, when torque is transmitted between the input gear 7 and the output gear 8 by the torque transmission shaft 6, the portion between the two gears 7 and 8 is elastically twisted and deformed. These gears 7 and 8 (both ends in the axial direction of the torque transmission shaft 6 and the first and second two encoders 10 and 11) are relatively displaced in the rotational direction. As a result of the relative displacement of the first and second two encoders 10 and 11 in the rotational direction in this way, the phase difference ratio between the output signals of the first and second sensors 37 and 38 (= phase difference). / 1 period) changes. Here, this phase difference ratio takes a value commensurate with the torque. Therefore, also in the case of this example, 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 5 with the torque measuring device of the present example, the work of attaching the sensor can be improved, the wiring work of the harness can be simplified, and the cost and weight can be reduced.
That is, in the case of this example, the phase of one end portion in the axial direction of the torque transmission shaft 6 is arranged on the inner diameter side of the torque transmission shaft 6, and the other end portion in the axial direction is the axial direction of the torque transmission shaft 6. It can be transmitted to the inner shaft 9 protruding from the other end opening. Therefore, the first encoder 10 for detecting the phase of the other axial end portion of the torque transmission shaft 6 and the second encoder 11 for detecting the phase of the one axial end portion of the torque transmission shaft 6 are provided. Can be arranged adjacent to the other axial end portion of the torque transmission shaft 6 (arranged together). Therefore, in the case of this example, since it is possible to use one sensor unit 12 holding the first and second sensors 37 and 38 in the holder 36, the sensor mounting workability is good. Can be. Specifically, the first and second sensors 37 and 38 can be positioned with high accuracy by performing the operation of attaching the holder 36 to the housing only once. Further, since the number of harnesses can be reduced from two to one, the wiring work of the harness can be simplified (the handling property can be improved), and the cost and weight can be reduced.

  In the case of this example, since the first encoder 10 is attached to the inner ring 15b which is smaller in size and lighter than the torque transmission shaft 6, the first encoder 10 is connected to the torque transmission shaft 6. Compared to the case where the first encoder 10 is directly attached to the transmission shaft 6, the attachment workability of the first encoder 10 can be improved. Furthermore, in the case of this example, one end portion in the axial direction of the inner shaft 9 is connected to the inner ring 15a which is smaller in size and lighter in weight than the torque transmission shaft 6, so that the inner shaft 9 As compared with the case of connecting to the torque transmission shaft 6, the connecting workability of the inner shaft 9 can be improved.

[Second Example of Embodiment]
A second example of the embodiment of the present example will be described with reference to FIGS. The feature of this example is that the support structure of the sensor unit 12a is devised. That is, in this example, a synthetic resin holder 36a holding a first sensor and a second sensor (not shown) is formed in an annular shape, and this holder 36a is connected to the other end side in the axial direction of the torque transmission shaft 6. Is supported and fixed to an outer ring 17b constituting a tapered roller bearing 13b. Therefore, in the case of this example, a small-diameter fitting cylinder part 41 is formed at one axial end of the holder 36a, and this fitting cylinder part 41 is connected to the inner peripheral surface of the other axial end of the outer ring 17b. The inner surface of the cylindrical surface portion 42 is fixed.

In the case of this example having the above-described configuration, the holder 36a can be easily positioned (especially in the radial direction). The gap in the radial direction between the detection section) and the detected sections of the first and second encoders 10 and 11 (first and second detected sections 34 and 35) can be easily and strictly managed. become.
About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

[Third example of embodiment]
A third example of the embodiment of the present example will be described with reference to FIGS. The feature of this example is that the connecting structure of the axial end portion of the inner shaft 9a is devised. That is, in the case of this example, one end portion of the inner shaft 9a in the axial direction is not the inner ring 15a constituting the tapered roller bearing 13a disposed on one end side in the axial direction of the torque transmission shaft 6a, but the torque transmission shaft 6a. It is directly connected to one axial end portion. For this reason, in the case of this example, the total axial length of the one end side small diameter step portion 22a formed at one end portion in the axial direction of the torque transmission shaft 6a is larger than in the case of the first example and the second example of the above embodiment. Further, the inner ring 15a is prevented from projecting to one end side in the axial direction from the one end side small diameter step portion 22a. Then, the inner peripheral surface of the extension 43 of the one-end-side small-diameter stepped portion 22a and the outer peripheral surface of the connecting flange portion 29a formed at one end in the axial direction of the inner shaft 9a are fitted with an interference fit so as not to be relatively rotatable. It is fixed.

In the case of this example having the above-described configuration, it is possible to sufficiently secure the fitting length between the one end side small diameter step portion 22a and the inner ring 15a. It is possible to effectively prevent relative rotation (creep) with respect to the side small diameter step portion 22a.
About another structure and an effect, it is the same as that of the case of the 2nd example of embodiment mentioned above.

[Fourth Example of Embodiment]
A fourth example of the embodiment of the present example will be described with reference to FIGS. The feature of this example is that the structure of the portion for measuring the magnitude of the torque transmitted by the torque transmission shaft 6 is devised. That is, in the case of this example, the support cylinder portion 25 of the inner ring 15b constituting the tapered roller bearing 13b disposed on the other end side in the axial direction corresponds to the torque detecting hole member described in the claims. The torque detection sleeve 44 is fitted and fixed. On the other hand, the torque detecting uneven member 45 is fitted and fixed to the other axial end of the inner shaft 9b.

  Of these, the torque detecting concavo-convex member 45 is made of a magnetic material, and is formed in a cylindrical shape as a whole. The outer peripheral surface shape is a concavo-convex shape (gear shape) in the circumferential direction on the outer peripheral surface in the axial direction. The torque detecting uneven portion 46 corresponding to the second detected portion described in the claims is provided. Then, in the state where one axial end portion of the torque detecting uneven member 45 is inserted into the inner diameter side of the axial other end opening of the torque transmission shaft 6, the axial one end portion of the torque detecting uneven member 45 is The inner shaft 9b is externally fitted and fixed to the other axial end. The inner shaft can be projected from the other axial opening of the torque transmission shaft to the other side in the axial direction, and an uneven portion for torque detection can be formed directly on the outer peripheral surface of the projected portion.

  On the other hand, the torque detection sleeve 44 is made of a nonmagnetic metal plate having conductivity such as an aluminum alloy, and is formed in a stepped cylindrical shape as a whole, and has a large diameter that is externally fixed to the support cylinder portion 25. A cylindrical portion 47 and a small diameter cylindrical portion 48 are provided. Of these, the small-diameter cylindrical portion 48 corresponds to the first detected portion described in the claims, and this torque detecting unevenness is formed on the outer diameter side of the torque detecting uneven portion 46 (second detected portion). It arrange | positions concentrically in the state which adjoined to the part 46 and radial direction. In this state, the small-diameter cylindrical portion 48 is located at a portion between the torque detecting uneven member 45 and a torque sensor unit 51 described later. The small-diameter cylindrical portion 48 is provided with a plurality of substantially rectangular through holes 49, 49 in double rows in the axial direction and at equal intervals in the circumferential direction. The circumferential phases of the window holes 49, 49 are shifted from each other by a half pitch.

  Further, the coil sensor unit 51 is supported and fixed to the outer ring 17b constituting the tapered roller bearing 13b disposed on the other end side in the axial direction by using a support member 50 having an L-shaped cross section and an annular shape as a whole. ing. The coil sensor unit 51 is concentrically disposed on the outer diameter side of the small diameter cylindrical portion 48 of the torque detecting uneven portion 46 and the torque detecting sleeve 45. The coil sensor unit 51 includes a cylindrical detection main body 52, a resin base 53 provided in a state of projecting radially outward from the outer peripheral surface of the detection main body 52, and the base 53. And a plurality of (four in the illustrated example) metal pins 54, 54 and connection terminals 55. The detection main body 52 includes a plurality of (two in the illustrated example) coil bobbins 56, 56 formed by winding a coil, and a metal yoke member 57 covering the coil bobbins 56, 56. The connection terminal 55 is provided on a part of the detection body 52 in the circumferential direction so as to protrude radially outward, and is connected to the coil bobbins 56 and 56. The connection terminal 55 is connected to a circuit board (not shown), and transmits the output signal of the coil sensor unit 51 to a calculator through a single harness.

Also in the case of the rotation transmission device 5 with the torque measuring device of the present example having the above-described configuration, torque is transmitted by the torque transmission shaft 6, and among the torque transmission shaft 6, the input gear 7 and the output gear 8. The portion for detecting torque is indirectly attached to one end of the torque transmission shaft 6 in the axial direction through the inner shaft 9b by an amount corresponding to the direction and magnitude of the torque. Circumference between the torque detecting uneven portion 46 of the uneven member 45 and the small diameter cylindrical portion 48 of the detecting sleeve 44 that is indirectly attached to the other axial end of the torque transmission shaft 6 via the inner ring 15b. The positional relationship with respect to the direction changes. For this reason, a change occurs in the impedance of the coil bobbins 56 and 56 constituting the coil sensor unit 51. Therefore, the direction and magnitude of the torque can be detected based on this impedance change.
About another structure and an effect, it is the same as that of the case of the 1st example of embodiment mentioned above.

  The torque transmission shaft constituting the rotation transmission device with a torque measuring device of the present invention can be a counter shaft or an input shaft (turbine shaft) to which torque is input from a torque converter. Further, the type of transmission used by incorporating the rotation transmission device with the torque measuring device of the present invention is not particularly limited, and various types of continuously variable transmissions (CVT) such as automatic transmission (AT), belt type and toroidal type, It is possible to employ a transmission that performs a shift by vehicle-side control, such as an automated manual transmission (AMT) or a dual clutch transmission (DCT). In addition, the relationship between the installation position of the transmission and the drive wheels is not particularly limited, and both the front engine front wheel drive vehicle (FF vehicle) and the front engine rear wheel drive vehicle (FR vehicle) are targeted. Further, the measured rotational speed and torque may be used for vehicle control other than shift control and engine output control. Further, the prime mover 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 in 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. Further, in the case of the first to third examples of the above-described embodiment, the first and second encoders are made of permanent magnets, and the first and second encoder detected surfaces have N and S poles. Are alternately arranged in the circumferential direction. 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.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Encoder 3 Sensor 4 Harness 5 Rotational transmission device with torque measuring device 6, 6a Torque transmitting shaft 7 Input gear 8 Output gear 9, 9a, 9b Inner shaft 10 First encoder 11 Second encoder 12, 12a Sensor unit 13a , 13b Tapered roller bearings 14a, 14b Inner ring raceway 15a, 15b Inner ring 16a, 16b Outer ring raceway 17a, 17b Outer ring 18a, 18b Retainer 19a, 19b Tapered roller 20a, 20b Small flange part 21a, 21b Large collar part 22, 22a One end side Small diameter step portion 23 Spacer 24 Other end side small diameter step portion 25 Support cylinder portion 26 Cylindrical surface fitting portion 27 Involute spline engagement portion 28 Step surface 29, 29a Connecting flange portion 30 Support ring 31 Support ring 32 Permanent magnet 33 Permanent magnet 34 First detected part 35 Second detected part 36, 36a Holder 7 First sensor 38 Second sensor 39 Harness 40 Mounting hole 41 Fitting cylinder part 42 Cylindrical surface part 43 Extension part 44 Torque detection sleeve 45 Torque detection uneven part 46 Torque detection uneven part 47 Large diameter cylindrical part 48 Small diameter cylindrical part 49 Window hole 50 Support member 51 Coil sensor unit 52 Detection body 53 Base 54 Pin 55 Connection terminal 56 Coil bobbin 57 Yoke member

Claims (4)

A hollow torque transmission shaft;
A pair of rolling bearings rotatably supporting both axial ends of the torque transmission shaft;
Of the outer peripheral surface of the torque transmission shaft, an input gear and an output gear fixed in an axially spaced state to an axial intermediate portion sandwiched between the rolling bearings,
An inner shaft that is disposed on the inner diameter side of the torque transmission shaft, and that has one end in the axial direction coupled directly or indirectly to the one end in the axial direction of the torque transmission shaft so as not to be relatively rotatable;
An inner ring constituting a rolling bearing having an annular first detected portion whose characteristics are changed in the circumferential direction and rotatably supporting the other axial end portion of the torque transmission shaft among the rolling bearings. A first characteristic change member attached to the
An annular second detected portion whose characteristics are changed with respect to the circumferential direction, and the second detected portion close to the first detected portion, the other axial end portion of the inner shaft A second characteristic change member attached to the
Supported by the part that does not rotate during use with the detection part facing the first and second detection parts, and detects the phase change in the circumferential direction between the first and second detection parts. With possible sensor devices,
Rotation transmission device with torque measuring device. The first characteristic changing member is a first encoder that changes the magnetic characteristic of the first detected portion alternately and at an equal pitch in the circumferential direction,
The second characteristic change member is a second encoder that changes the magnetic characteristic of the second detected portion alternately and at an equal pitch in the circumferential direction,
The sensor device includes a first sensor that causes a first detection unit to face the first detection unit and changes an output signal in response to a change in magnetic characteristics of the first detection unit, and the second detection unit. A second sensor that opposes the second detection unit to change the output signal in response to a change in magnetic characteristics of the second detected portion, and a holder that holds both the first and second sensors. A sensor unit,
The rotation transmission device with a torque measuring device according to claim 1. Of the first and second characteristic changing members, either one of the characteristic changing members is made of a magnetic material, and the detected portion has an uneven shape in the circumferential direction, and the other is a torque detecting uneven member. The characteristic changing member is made of a non-magnetic plate, and has a plurality of holes in the detected portion at equal intervals in the circumferential direction, and the radial direction or the axial direction with respect to the detected portion of the uneven member for torque detection Is a perforated member for torque detection that is disposed in a portion between the uneven member for torque detection and the sensor device in a state of being superimposed on
This sensor device is a coil sensor unit that includes a coil as a detection unit and changes impedance in response to a phase change in a circumferential direction between the two detection units.
The rotation transmission device with a torque measuring device according to claim 1. The axial direction one end part of the said inner shaft is connected with the inner ring | wheel which comprises the rolling bearing which rotatably supported the axial direction one end part of the said torque transmission shaft among the said both rolling bearings. A rotation transmission device with a torque measuring device according to any one of the above.

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