JPH0788895B2 - Torque detector for automatic transmission - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detection device for detecting the output torque of an automatic transmission used in a vehicle, and more particularly to accurately detecting the output torque of the automatic transmission. It was done.

[Conventional technology]

Generally, an automatic transmission is configured to change the power transmission path by changing the power transmission path by selective hydraulic operation of various friction elements. However, if the power transmission path is switched too quickly, a shift shock may occur, which may cause occupant discomfort. give.

In order to prevent this shift shock, it is necessary to measure the operating hydraulic pressure of the friction element by measuring the input torque and the output torque to the friction element and performing a predetermined calculation based on these to control the output torque. It is important as an element to judge whether or not a gear shift shock is actually generated when the hydraulic pressure of each friction element is controlled to perform a gear shift operation.
By feeding back this output torque to the shift control device that controls the hydraulic pressure for each friction element, the shift shock can be suppressed as much as possible. Therefore, it is desired to accurately detect the output torque.

As a conventional torque detecting device for an automatic transmission, there are, for example, those described in JP-A-61-127952 and JP-A-61-127953.

In this conventional example, one or a plurality of torque detectors each having a built-in torque detection element are fitted to a rear end portion of a transmission case for a front-mounted engine rear wheel drive of a vehicle, a fitting structure, a rib and a screw engaging with the rib. It is attached by a structure or a flange structure, and the detection surface of the torque detector is opposed to the output shaft extending from the transmission case with a predetermined distance in the circumferential direction. The torque detector has a structure in which an exciting coil and a detection coil are wound around a substantially U-shaped magnetic core, and the outer peripheral surface of the output shaft facing the torque detector has a higher detection sensitivity. To
A thin film (ribbon) having a thickness of 20 to 30 μm and made of a magnetically permeable member such as amorphous is adhered with a heat resistant adhesive.

[Problems to be solved by the invention]

However, in the above-described conventional torque detecting device for an automatic transmission, since the torque detecting head in which the exciting coil and the detecting coil are wound around the magnetic core is applied as the torque detector, the mounting position thereof is large in the mounting space. It is limited to the inside of the rear extension that is connected to the outside of the transmission, and is large on the outer peripheral side like the output shaft of the automatic transmission for front engine front wheel drive and the counter shaft that is the final output stage connected to it. There is a problem that the torque detection head cannot be provided for the rotating member having no mounting space, and the output torque cannot be detected. Especially, in the case of an automatic transmission for front-mounted engine front-wheel drive, There is a restriction on the total length in the axial direction, and the length of the counter shaft is lengthened to secure the mounting space for the torque detector around it. Rukoto can not.

Therefore, the present invention has been made by paying attention to the problems of the above-mentioned conventional example, and by directly detecting the torque of the counter shaft which is the final output stage connected to the output shaft, An object of the present invention is to provide a torque detection device for an automatic transmission that can solve the problems.

[Means for solving problems]

The driving force from the engine is transmitted through the input shaft connected to the torque converter, and the driving force is automatically shifted and transmitted to the output shaft by appropriately selecting a plurality of fastening elements in the transmission case, In an automatic transmission that outputs the driving force transmitted to the output shaft to a differential device via a counter shaft connected to the output shaft, the output shaft, the counter shaft, and the differential device are arranged in parallel, and the counter is provided. The output shaft is connected to one end of the shaft, and the differential device is connected to the other end thereof, and an annular ring having a shape magnetic anisotropy is formed on an outer peripheral surface of an intermediate portion between the output shaft and the connection position of the differential device in the counter shaft. A torque detecting surface is formed and the transmission casing facing the torque detecting surface is formed. It is characterized in that the cylindrical member fixed to the scan wearing the torque detector having a detection coil.

[Action]

According to the present invention, the outer peripheral surface or the inner peripheral surface of the counter shaft, which is the final output stage connected in parallel to the output shaft in the transmission case, has a shape magnetic anisotropy or has a shape magnetic anisotropy. A torque detection surface is formed by sticking a thin film having a property, and a torque detector including a detection coil is provided on a cylindrical member fixed to the transmission case facing the torque detection surface, thereby acting on the torque detection surface. A change in magnetic permeability of the torque detection surface due to a tensile force or a compression force based on the torque is detected by the detection coil. As described above, since it is only necessary to provide the detection coil as the torque detector, it is possible to arrange the torque detector in a slight gap between the counter shaft and the fixed-side member facing the counter shaft. The transmitted output torque can be accurately detected.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an automatic transmission for driving front wheels of a front engine according to an embodiment of the present invention.

In the figure, 1 is a transmission case, a converter housing 2 is integrally connected to the front end side thereof, and a side cover 3 is integrally connected to the rear end side thereof.

Transmission case 1 of converter housing 2
An oil pump cover 4 is fixed to the side, and a hydraulic pump 5 is arranged between the oil pump cover 4 and the converter housing 2. The oil pump cover 4 is formed with a cylindrical portion 4a as a fixed-side cylindrical member extending in the converter housing 2 at the center thereof.
The input shaft 6 is fitted inside, and the drive shaft 5a of the hydraulic pump 5 connected to the pump 7p of the torque converter 7 is fitted outside.

In the torque converter 7, the converter cover 7c is connected to the crankshaft 9 of the engine via the drive plate 8, the stator 7s is connected to the cylindrical portion 4a of the oil pump cover 4 via the one-way clutch 10, and the turbine 7t is input. It is splined to the shaft 6.

A power train is connected to a rear end portion of the input shaft 6 in the transmission case 1, as schematically shown in FIG.

This power train has a front planetary gear G _F and a rear planetary gear G _R , and among the sun gear S _F , the carrier C _F and the ring gear R _F of the front planetary gear G _F , the sun gear S _F is the band brake B. It can be fixed by / B and can be connected to the input shaft 6 by the reverse clutch R / C, and the carrier C _F can be connected to the input shaft 6 by the high clutch H / C. It prevents rotation of and can be fixed by low reverse brake LR / B. Rear planetary gear G _R sun gear S _R , carrier C _R and ring gear R _R
Among them, the sun gear S _R is directly connected to the input shaft 6,
C _R is connected to ring gear R _R and output shaft 11, and ring gear R _R
Can be connected to the carrier C _F by the low clutch L / C.

Such a power train can obtain a predetermined shift speed by selectively hydraulically operating various friction elements, and can automatically shift to a corresponding shift speed by changing a friction element that is hydraulically operated.

Further, as shown in FIG. 1, an idler gear 12 is meshed with the output shaft 11, and a pinion reduction gear 13 having a shaft portion 13a as a counter shaft and a final drive pinion 13b is spline-coupled to the idler gear 12, The final drive pinion 13b is connected to the differential device 14 on the front wheel side.

Then, the shaft portion 13a of the pinion reduction gear 13
And a cylindrical portion 1a formed on the transmission case 1
A torque detection device 20 that detects the rotational torque transmitted to the shaft portion 13a as the output torque of the automatic transmission is disposed therebetween.

That is, as shown in FIGS. 3 and 4, the torque detection device 20 includes a torque detection surface 20A formed on the outer peripheral surface of the shaft portion 13a and a torque detection device including a coil facing the torque detection surface 20A. The device 20B and a measuring unit 20C that measures the rotational torque based on the detection signal of the torque detector 20B.

The torque detection surface 20A has a first groove row 32A composed of a plurality of grooves a, ..., A along the circumferential direction of the shaft portion 13a.
(See FIGS. 3 and 5) and a second groove row 32B (see FIGS. 3 and 5) composed of a plurality of grooves b, ..., B.

Further, each of the grooves a, ..., A has an inclination angle of −45 degrees with respect to the axial direction of the shaft portion 13a (see the arrow A in FIG. 3) (where the axial direction is the reference axis). , When the counterclockwise direction is taken as positive and when the clockwise direction is taken as negative), each of the grooves b, ..., b is +
It is formed at a predetermined depth (for example, 1 mm) with an inclination angle of 45 degrees at equal intervals.

By providing the grooves a, ..., A and b, ..., B, the first and second groove rows 32A, 32B are provided between the grooves a ,. ..., b Band-shaped ridges a ', ..., a'and b'as a part of the circumference, ...
., B 'are formed (see FIG. 5). This ridge a '...
.., a ′ and b ′, ..., b ′ guide the magnetic flux φ for torque detection, which will be described later, with a predetermined inclination angle (45 degrees in this embodiment) with respect to the shaft axis direction. (Refer to the dotted line in FIG. 5), whereby the first and second groove rows 32A,
32B is capable of possessing shape magnetic anisotropy with mutually opposite characteristics.

Therefore, the groove length, the groove width, and the groove interval for each of the grooves a, ..., A and b, ..., B are set to predetermined values that can secure the above-described shape magnetic anisotropy.

In practice, the groove rows 32A and 32B of the torque detection surface 20A are formed by cutting the pinion reduction gear 13 using a cutting machine such as a hobbing machine.

Here, the first and second groove rows 32A and 32 in the present embodiment.
B is set so as to have a so-called positive magnetostriction property in which the magnetic permeability increases when subjected to tensile deformation.

On the other hand, the torque detector 20B has a predetermined distance in the groove rows 32A, 32B in the annular grooves 33A, 33B formed at positions facing the respective groove rows 32A, 32B of the cylindrical portion 1a facing the torque detection surface 20A. First and second for excitation and detection, which are close to and face each other via the air gap
It has coils 34A and 34B.

On the other hand, the above-mentioned measuring unit 20C is configured as shown in FIG. To explain this in detail, in the figure, 40 is the
1, second coil 34A, 34B and resistance (resistance value R ₁ , R ₂ ) 41A, 41B
It is a bridge circuit with. In this bridge circuit 40, the inductance L ₁ of the first coil 34A is a value including the inductive inductance of the first groove row 32A, and similarly, the inductance L ₂ of the second coil 34B is the inductance of the second groove row 32B. It is a value including the induction inductance. Then, the AC power supply 42 is connected to the input terminals a and b of the bridge circuit 40.
On the other hand, the output terminals c and d are connected to the signal processing unit 43 that processes the detection signal. Here, the frequency of the AC power supply 42 is set to a value (for example, about 10 kHz to 30 kHz) sufficient to generate a so-called skin effect, in which the magnetic flux passing through the groove rows 32A and 32B is distributed only on the surface thereof. .

In addition, the signal processing unit 43 uses the rectifier circuits 44A and 44B that convert the detection signals from the output terminals c and d of the bridge circuit 40 into direct current, the output of the rectifier circuit 44A as positive, and the output of the rectifier circuit 44B as negative. A differential amplifier 45 that takes the difference between them and amplifies and outputs the amplified signal as a torque detection signal is configured.

Here, in the present embodiment, the inductances L ₁ and L ₂ of the bridge circuit 40 are set so that L ₁ = L ₂ in the state where the rotational torque is not transmitted to the input shaft 6, and therefore, In the state, the resistance values R ₁ and R _{2 of the} resistors 41A and 41B are set so that the output of the bridge circuit 40 becomes zero, that is, the balanced state.

Next, the operation of the above embodiment will be described.

First, when the select lever (not shown) is set to the neutral range or the parking range and the engine is stopped, the converter cover 7c and the pump 7p of the torque converter 7 are stopped rotating, and the input shaft 6 The output shaft 11 and the pinion reduction gear 13 are in a rotation stop state, and the rotational torque of the shaft portion 13a of the pinion reduction gear 13 remains zero. in this case,
When the AC power supply 42 of the measuring unit 20C is turned on and the AC current of a predetermined frequency is supplied to the first and second coils 34A and 34B,
A magnetic closed circuit as shown by the dotted line in FIG. 3 is formed.
That is, looking at this in the magnetic circuit applied to the first coil 34A, each magnetic flux φ passes through the cylindrical portion 5a, the air gap, and the first groove row 32A, and again becomes a path through the air gap and the cylindrical portion 5a. The same applies to the magnetic circuit related to the second coil 34B.

At this time, the magnetic fluxes Φ, ..., Φ in the first and second groove rows 32A, 32A are due to the skin effect, the surface portions of the first and second groove rows 32A, 32B, that is, the grooves a. , ...,
Strip-shaped ridges a'between a and b, ..., b
., A'and b ', ..., b', and pass through with a positive or negative 45 degree inclination angle with respect to the axial direction (see the dotted line in FIG. 5). In this state, the inductance L ₁ = L ₂ as described above, so the bridge circuit
The AC outputs of the output terminals c and d of 40 have the same phase and the same potential. Therefore, the DC outputs of the rectifier circuits 44A and 44B are equal to each other, the output value of the differential amplifier 45 becomes zero, and the rotational torque for the input shaft 6 is displayed.

From this state, when the ignition switch (not shown) is turned on and the engine is started, the converter cover 7c of the torque converter 7 and the pump 7p are accompanied by this.
Rotates, and the rotational torque of the engine is transmitted to the input shaft 6 directly connected to the turbine 7t.

However, in this state, since the neutral range or the parking range is selected by the select lever, hydraulic oil is not supplied to each clutch and brake of each power train, and the state is in the open state, and the input shaft 6 and the output shaft 11
Since the output shaft 11 and the pinion reduction gear 13 maintain the rotation stopped state, the torque detection value output from the differential amplifier 45 of the torque detection device 20 also maintains zero.

When the drive range is selected with the select lever from this stopped state, the low clutch L / C is engaged by this, and the ring gear R _R of the rear planetary gear G _R rotates to the left due to the operation of the one-way clutch OWC. Prevent. Therefore, the rotational force transmitted to the input shaft 6, the sun gear S _R of the rear planetary gear G _R, carrier C _R
Is transmitted to the output shaft 11 via the idler gear 12, and is transmitted from the output shaft 11 to the shaft portion 13a of the pinion reduction gear 13 in the counterclockwise direction when viewed from the direction of arrow A in FIG. 3 (arrow in FIG. 5). Rotational torque in the F direction) is transmitted.

Due to this rotational torque, the first groove row 32A of the torque detection surface 20A is subjected to compressive deformation in the direction indicated by-in Fig. 5, while the second groove row 32B is tensile deformed in the direction indicated by-in Fig. 5. Receive. By this deformation action, the first
In the groove row 32A of, the magnetic permeability decreases, and the magnetic fluxes φ, ..., φ passing therethrough decrease, and as a result, the inductance L ₁
Is reduced. On the other hand, in the second groove row 32B, the magnetic permeability increases, and the magnetic flux φ passing therethrough is ...
φ increases, and eventually the inductance L ₂ increases.

Therefore, in the bridge circuit 40 of the measuring unit 20C, the balance is lost, and the voltage at the output end c-b side becomes higher than that at the output end db side. Therefore, in the signal processing unit 43, the output of the rectifier circuit 44A is the rectifier circuit 44B.
And the differential amplifier 45 outputs a rotational torque detection signal indicating a positive value.

When further accelerating from this starting condition, the low clutch L / C
The band brake B / B becomes operation state in addition to fixing the sun gear S _F of the front planetary gear G _F. Thus, the rotational force transmitted to the input shaft 6 is transmitted to the ring gear R _F of the front planetary gear G _F via the sun gear S _R, the carrier C _R of the rear planetary gear G _R, now the carrier C _F, low Clutch L / C, rear planetary gear G
Via the ring gear R _R, and carrier C _R of _R is transmitted to the output shaft 11. Therefore, the speed is increased by the amount by which the rear ring gear R _R rotates compared to the first speed state. Therefore, the rotational torque transmitted to the shaft portion 13a of the pinion reduction gear 13 decreases from that in the starting state, and the torque detection value corresponding to this is output from the differential amplifier 45 of the measuring unit 20C.

When the accelerator pedal is further depressed to accelerate, band brake B / B is released, and instead of this, high clutch H / C
Is engaged, the low speed clutch L / C is released when the vehicle is further accelerated, and the band brake B / B is engaged instead of the low clutch L / C, thereby shifting to the fourth speed state. Accordingly, the rotational torque transmitted to the shaft portion 13a of the pinion reduction gear 13 gradually decreases,
The torque detection value corresponding to these is measured by the differential amplifier 4 of the measuring unit 20C.
Output from 5.

On the other hand, if the reverse range is selected from the state where the neutral range or the parking range is selected with the select lever, the reverse clutch R / C is engaged and
It concluded that the low reverse brake LR / B, the rotational force transmitted to the input shaft 6 is transmitted to the output shaft 11 via the reverse clutch R / C, sun gear S _F of the front planetary gear G _F, and a ring gear R _F The output shaft 11 rotates in the reverse direction, so that the rotational torque in the clockwise direction (the direction indicated by the arrow R in FIG. 5) is transmitted to the pinion reduction gear 13 when viewed from the direction indicated by the arrow A in FIG.

In this state, tensile deformation occurs in the groove row 32A of the torque detection surface 20A of the shaft portion 13a of the pinion reduction gear 13 in the direction indicated by the arrow in Fig. 5, and the magnetic permeability increases. While the inductance L ₁ increases, the groove array 32B undergoes compressive deformation in the direction shown by the arrow in the figure, the permeability decreases, and the inductance L ₂ decreases. Therefore, the measuring unit 20
Since the voltage between the terminals c and b of the bridge circuit 40 at C drops and the voltage between the terminals d and b rises, the differential amplifier 45 outputs a negative output voltage according to the rotational torque. .

Therefore, when the above-described measurement is executed for various rotational torques for each rotational direction input to the shaft portion 13a of the pinion reduction gear 13, the pinion reduction gear 13
The value shown in FIG. 7 is obtained because the value of the rotational torque applied to the shaft portion 13a and the value of the magnetic permeability of the first and second groove rows 32A and 32B are in a proportional relationship. That is, when the rotation torque is zero, the output voltage of the signal processing unit 43 becomes zero, and when the counterclockwise or clockwise rotation torque is applied to the shaft portion 13a of the pinion reduction gear 13 from this state, the torque is changed. A positive or negative output voltage proportional to the value is obtained. In other words, the value of the output voltage makes it possible to know the magnitude of the rotational torque input to the shaft portion 13a of the pinion reduction gear 13, that is, the output torque of the automatic transmission, and the sign of the output voltage makes it possible to know the direction of application of the rotational torque. be able to.

Therefore, the shaft portion of the pinion reduction gear 13
The torque detection value in 13a includes the torque fluctuation due to the shift shock that occurs when each friction element of the power train is engaged / released. Therefore, this torque detection value is used as the operating oil pressure of each friction element of the power train shown in FIG. By supplying it as a feedback signal to the gear shift control device 50 that controls the gear shift control, it is possible to perform optimum gear shift control that suppresses gear shift shock during gear shift.

The present embodiment has various advantages because it is constructed and operates as described above.

First, the torque detection surface 20A is the pinion reduction gear 1
Grooves a, ..., a and b, ..., b are formed directly on the outer peripheral surface of the shaft portion 13a of FIG. 3, thereby forming a single member utilizing the magnetic characteristics of the shaft portion 13a itself. Since there,
Compared to the case of sticking a magnetostrictive thin film, its processing process is simplified, it can be made inexpensive, and it becomes mechanically robust, as in the case of a composite member that sticks a magnetostrictive thin film, There is no difference in the coefficient of thermal expansion between the members,
The temperature characteristics are improved, and since the torque detection surface 20A is formed over the circumferential surface of the predetermined area, the detection outputs thereof are averaged in the circumferential direction, and structural defects inside the shaft portion 13a, etc. Is not directly affected by the local disturbance of the magnetic characteristics, and even if eccentricity occurs in the shaft portion 13a, the effect of this eccentricity error can be canceled by both sides sandwiching the shaft portion 13a. Can be significantly improved.

Further, in the present embodiment, the torque detection surface 20A is configured such that the two groove rows 32A and 32B receive the deformation forces in the opposite directions with respect to the rotational torque, so that output signals of opposite polarities are obtained. Therefore, the range width of the detection signal with respect to the change of the torque can be set large, and the input torque can be detected while maintaining the above-mentioned high accuracy.

Furthermore, in this embodiment, the first and second coils 34A and 34B are
Since it is configured to be used for both excitation and detection,
The size can be further reduced as compared with the case where both coils are separately wound.

In each of the above-described embodiments, the case where the first and second groove rows 32A and 32B are provided as the torque detection surface has been described, but the present invention is not necessarily limited to this, and for example, the above The configuration can be simplified with only one of them, and in that case, one or both of the rotating torques can be appropriately measured depending on the way of assembling the bridge circuit 40 of the measuring unit 20C. On the other hand, in the above case,
When the mounting space is large, the torque detection surface 20A
Alternatively, a plurality of sets of the torque detectors 20B and the torque detectors 20B may be provided so as to have the shape magnetic anisotropy in the same direction, thereby increasing the detection output and further improving the detection accuracy.

Further, in each of the above-described embodiments, the grooves a, ..., A and
The inclination angles of b, ..., b are set to −45 degrees and +45 degrees, respectively, but the present invention is not necessarily limited to this.
For example, the inclination angles may be opposite to each other, or may be an angle other than 45 degrees depending on the processing requirements.

Furthermore, in the measuring unit 20C described above, the case where the output voltage according to the rotation torque is measured has been described, but the output voltage is digitized and processed by the microcomputer,
It is also possible to perform power train shift control.

By the way, in the present invention, the groove is provided obliquely as the magnetic flux direction defining means constituting the shape magnetic anisotropy,
As a modification of this, a groove-shaped non-magnetic member may be embedded to reduce leakage of magnetic flux and to ensure more secure passage of magnetic flux in an oblique direction.

Further, in the above embodiment, the case where the torque detection surface is directly formed on the shaft portion 13a of the pinion reduction gear 13 has been described, but the present invention is not limited to this, and a thin film formed with an amorphous slit array is used as a pinion. It may be attached to the shaft portion 13a of the reduction gear 13.

Further, not only when the rectifier circuits 44A and 44B are applied as the measuring unit, but when the AC differential amplifier is applied as the differential amplifier, the output terminals c and d of the bridge circuit 40 are directly input to the differential amplifier. The bridge circuit 44 may be connected to the side, as long as it is configured so that the balanced state and the unbalanced state of the output terminals c and d of the bridge circuit 44 can be detected.

Furthermore, the automatic transmission is not limited to the configuration of the above embodiment, and the present invention can be applied to an automatic transmission having any other configuration.

As described above, according to the present invention, the output shaft, the counter shaft, and the differential device are arranged in parallel in the transmission case of the automatic transmission, and the output shaft is provided at one end of the counter shaft. , The differential device is connected to the other end, respectively, to form an annular torque detection surface having a shape magnetic anisotropy on the outer peripheral surface of the intermediate portion between the connection position of the output shaft and the differential device in the counter shaft, Since the torque detector having the detection coil is arranged on the cylindrical member fixed to the transmission case facing the torque detection surface, it becomes possible to directly detect the output torque of the automatic transmission. Greatly improves the control accuracy of the shift control device that suppresses shift shock by using Can be improved.

Further, since the torque detection device can be arranged in a narrow space, the total length of the transmission case does not become long, and a special bracket or the like can be used when mounting the torque detector on the cylindrical member fixed to the transmission case. In addition, since the counter shaft and the cylindrical member are concentrically arranged, it is possible to maintain a uniform gap between the detection coil of the torque detector and the torque detection surface.

Further, since the counter shaft has a relatively long length, the degree of freedom in designing the torque detection device is large, and the rotational force of the output shaft is input through the reduction gear, so that the output shaft is Since the rotational torque is increased in comparison, the detection accuracy can be improved without using a highly accurate torque detection device, and thus the torque detection surface can be easily formed.

Furthermore, since the counter shaft has gears arranged on the input side and the output side respectively,
It is possible to adjust according to the dynamic range of the torque detection device, and also from this point, the torque detection accuracy of the detection device can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a schematic view showing an example of a power train, FIG. 3 is a partially enlarged sectional view of an essential part of FIG. 1, and FIG. Fig. 5 is a sectional view taken along the line IV-IV in Fig. 5, Fig. 5 is a development view showing a torque detecting surface formed on the input shaft, Fig. 6 is a block diagram showing an example of a measuring unit, and Fig. 7 is a torque detecting device torque. It is a characteristic diagram which shows the relationship with an output voltage. In the figure, 1 is a transmission case, 4 is an oil pump cover, 4a is a cylindrical part, 6 is an input shaft, 7 is a torque converter, 11 is an output shaft, 12 is an idler gear, 13 is a pinion reduction gear, and 13a is a shaft part (counter. Shaft), 14 is a differential device, 20 is a torque detection device, 20A is a torque detection surface, 20B is a torque detector, 20C is a measuring unit, 32A and 32B are groove rows, 34A and 34B are coils, 40 is a bridge circuit, and 45 is a 45. Is a differential amplifier.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroyuki Hirano 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Kunihiko Morikawa 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. ( 72) Inventor Hisashi Kitahara, 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture, Nissan Motor Co., Ltd. (72) Masaki Sugimoto, 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) Reference: JP-A-61 -127952 (JP, A)

Claims (1)

[Claims] 1. A driving force from an engine is transmitted through an input shaft connected to a torque converter, and the driving force is automatically changed and output by appropriately selecting a plurality of fastening elements in a transmission case. In an automatic transmission that transmits the driving force transmitted to an output shaft to a differential device via a counter shaft connected to the output shaft, the output shaft, the counter shaft, and the differential device are arranged in parallel. At the same time, the output shaft is connected to one end of the counter shaft and the differential device is connected to the other end of the counter shaft, and the shape magnetic anisotropy is formed on the outer peripheral surface of the intermediate portion between the connection positions of the output shaft and the differential device on the counter shaft. Of the transformer, which forms an annular torque detecting surface having a property, and faces the torque detecting surface. Torque detecting apparatus for an automatic transmission, characterized in that mounted a torque detector in a cylindrical member fixed to Tsu Deployment casing having a detection coil.