JP2020101502A - Vehicle torque sensor - Google Patents

Abstract

To provide a vehicle torque sensor measuring torque given to a rotation shaft having magnetostrictive characteristic in which electromagnetic noise can be decreased to suppress hysteresis error.SOLUTION: A torque sensor 1 comprises: a plurality of detection coils 30, 35; a measurement part 41; metal coil shield parts 6, 7; and a magnetic ring 8. The detection coils 30, 35 are formed by winding insulated wire around a rotation shaft separated by a prescribed distance from the rotation shaft. The coil shields 6, 7 cover at least one part of side face parts 30A, 30B that are edge faces in an axial direction L side of the rotation shaft of the detection coils 30, 35. The measurement part 41 detects change of inductance in the detection coils 30, 35 to measure torque applied to the rotation shaft. In an outer peripheral side of the magnetic ring 8, a component is used in which an electromagnetic wave can be transmitted.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a vehicle torque sensor that measures a torque applied to a rotating shaft having a magnetostrictive characteristic.

Patent Document 1 below proposes a technique in which a magnetostrictive torque sensor covers the outer peripheral side of a detection coil arranged around the rotating shaft with a shield portion for the purpose of reducing electromagnetic noise.

Japanese Patent No. 3065230

However, the torque sensor of Patent Document 1 has a problem that the magnetic field generated in the shield portion may increase the hysteresis error of the torque sensor.
One aspect of the present disclosure is to enable a hysteresis error to be suppressed while reducing electromagnetic noise in a vehicle torque sensor that measures torque applied to a rotating shaft having a magnetostrictive characteristic.

One aspect of the present disclosure is a vehicle torque sensor that measures torque applied to a rotating shaft having a magnetostrictive characteristic, and includes a plurality of detection coils, a measurement unit, a coil shield unit, and a magnetic ring. ..
The plurality of detection coils are configured by winding insulated wires around the rotating shaft at a predetermined distance from the rotating shaft. The coil shield portion is formed of a material that suppresses the transmission of a magnetic field, and covers at least a part of a side surface portion that is an end surface of the plurality of detection coils on the axial direction side of the rotating shaft. The measuring unit measures the torque applied to the rotating shaft by detecting the change in the inductance of the plurality of detection coils. The magnetic ring is arranged on the outer peripheral side of the plurality of detection coils and has a magnetic body formed in a hollow cylindrical shape. A member having a material that allows the transmission of a magnetic field is arranged on the outer peripheral side of the magnetic ring.

With such a configuration, electromagnetic noise can be reduced by covering the side surface portions of the plurality of detection coils with the shield portion. Further, according to such a configuration, the outer peripheral side of the magnetic ring is not covered with the member that blocks the transmission of the magnetic field, and the magnetic field generated by the member that blocks the transmission of the magnetic field on the outer peripheral side can be suppressed. It is possible to suppress the hysteresis error of the sensor.

It is an exploded perspective view of a torque sensor. It is a perspective view (the 1) of a torque sensor. It is a perspective view (the 2) of a torque sensor. It is sectional drawing when a torque sensor is attached to a rotating shaft. It is a perspective view of the torque sensor which attached the terminal shield part. It is a perspective view of the torque sensor after resin molding. It is a block diagram of a measurement unit. 7 is a graph showing the relationship between torque and sensor sensitivity. It is a graph which shows the relationship between a torque and a hysteresis error. 6 is a graph showing the relationship between torque and the degree of variation in sensor sensitivity. It is a block diagram showing a measuring device. 6 is a graph showing the influence of a magnetic field generated when operating the torque motor in the torque sensor of the embodiment. 6 is a graph showing the influence of a magnetic field generated when operating a torque motor in a torque sensor of a reference example.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1-1. Overall configuration of torque sensor]
FIG. 1 is an exploded perspective view of a torque sensor 1 according to an aspect of the present disclosure. 2 and 3 are perspective views of the torque sensor 1 after assembly. FIG. 4 is a sectional view when the torque sensor 1 is attached to the rotating shaft 2.

As shown in FIG. 4, the torque sensor 1 is a magnetostrictive sensor that is mounted around a rotating shaft 2 having a magnetostrictive characteristic and measures a rotating torque applied to an arbitrary rotating shaft 2 mounted on a vehicle. ..

As shown in FIGS. 1 to 4, the torque sensor 1 includes a magnetostrictive torque sensor coil 5, coil shield portions 6 and 7, a magnetic ring 8, a terminal holding portion 9, and a plurality of terminal portions 50. Equipped with. In addition, in FIG. 1, the description of the terminal holding portion 9 and the terminal portion 50 is omitted.

The magnetostrictive torque sensor coil 5 includes a bobbin 20, and a first detection coil 30 and a second detection coil 35 (hereinafter also referred to as “detection coils 30 and 35”) that are configured by an insulated wire wound around the bobbin 20. ) And.

The rotating shaft 2 is made of a material having a magnetostrictive characteristic, and is formed in a cylindrical shape, in other words, a rod shape. Examples of the material having the magnetostrictive property include nickel, iron-aluminum alloy, iron-cobalt alloy and the like.

As the material used for the rotary shaft 2, either a positive magnetostrictive material whose magnetic permeability decreases when compressed and increases in tension or a negative magnetostrictive material whose magnetic permeability increases when compressed and decreases in tensile is used. It doesn't matter. As the rotating shaft 2, for example, a shaft used for torque transmission of a power train system, a shaft used for torque transmission of an engine of a vehicle, or the like can be adopted.

The bobbin 20 is inserted in the hollow portion of the magnetic ring 8. Coil shield portions 6 and 7 are arranged on both side surfaces of the bobbin 20 along the axial direction L of the rotary shaft 2. In other words, the bobbin 20 is fixed to the magnetic ring 8 so as to be sandwiched between the coil shield portions 6 and 7.

As shown in FIG. 4, in the torque sensor 1, a gap is formed between the inner wall of the bobbin 20 and the rotary shaft 2. By forming the gap, the torque sensor 1 is configured so as not to contact the rotating shaft 2. The bobbin 20 is provided apart from the rotating shaft 2 by a predetermined distance Δd, and is provided coaxially with the rotating shaft 2.

Further, since the torque sensor 1 is fixed to a fixed member such as a housing, the torque sensor 1 is configured not to rotate with the rotation of the rotating shaft 2.
The detection coils 30 and 35 are formed on the outer peripheral surface of the bobbin 20 by winding an insulated wire so as to be inclined ±45 degrees with respect to the axial direction L. The change in magnetic permeability when torque is applied to the rotating shaft 2 is greatest in the direction of ±45 degrees with respect to the axial direction L. Therefore, the inclination of the insulated wire with respect to the axial direction L is ±45 degrees. However, the angle of winding the insulated wire is not limited to ±45 degrees with respect to the axial direction L, and may be any angle.

In the present embodiment, the detection coils 30 and 35 are formed on the outer peripheral surface of the bobbin 20. Therefore, it is preferable to use the bobbin 20 made of a material, for example, a resin, which has a smaller influence on the magnetic flux generated in the detection coils 30 and 35 than the metal material.

The magnetic ring 8 is made of a magnetic material, for example, a ferromagnetic material such as a dust core, and has a hollow cylindrical shape. The bobbin 20 provided with the detection coils 30 and 35 is inserted into the hollow portion of the magnetic ring 8, and the magnetic ring 8 is arranged so as to cover the outer peripheral surface of the bobbin 20.

The inner diameter of the magnetic ring 8 is approximately the same as the outer diameter of the bobbin 20, and is formed slightly larger than the outer diameter of the bobbin 20. The magnetic ring 8 plays a role of suppressing magnetic flux generated in the detection coils 30 and 35 from leaking to the outside and lowering the sensitivity.

Here, in the torque sensor 1, a resin member (resin mold) 62 is arranged on the outer peripheral side of the plurality of detection coils 30 and 35 centering on the rotating shaft 2 and on the outer peripheral side of the magnetic ring 8. The resin member 62 is made of synthetic resin or the like, and allows the transmission of a magnetic field. It should be noted that the magnetic ring 8 is not limited to the resin member 62 on the outer peripheral side thereof, but a material that allows transmission of a magnetic field, for example, a nonmetal such as air may be arranged.

The “member formed of a material that allows the passage of a magnetic field” may include a metal (an example of a material that suppresses the passage of a magnetic field) in a range where the passage of electromagnetic waves is allowed. Specifically, a material such as a metal that suppresses the transmission of electromagnetic waves may be included within a range in which the characteristics such as the sensitivity and the hysteresis error of the detection coils 30 and 35 do not change.

The terminal holding portion 9 is arranged in contact with the coil shield portion 6 on one side of the coil shield portions 6 and 7. More specifically, the terminal holding portion 9 is arranged on the surface of the coil shield portion 6 opposite to the bobbin 20. The terminal holding portion 9 is formed in a ring shape having an outer diameter substantially matching the outer diameter of the magnetic ring 8 and an inner diameter substantially matching the inner diameter of the bobbin 20. A plurality of terminal portions 50 are connected to the terminal holding portion 9, and the plurality of terminal portions 50 are held by the terminal holding portion 9. In this embodiment, the two terminal parts 50 are held by the terminal holding part 9. However, the number of the terminal portions 50 held by the terminal holding portion 9 may be one, or may be three or more. The terminal holding portion 9 is made of an insulating material such as resin.

The terminal portion 50 is made of a conductive material, for example, a metal material, and is arranged so as to project to the outer peripheral side of the terminal holding portion 9. The terminal portion 50 is electrically connected to the insulated electric wires that form the plurality of detection coils 30 and 35.

The coil shield parts 6 and 7 have a function of protecting the detection coils 30 and 35 from external electromagnetic noise (shielding electromagnetic noise (magnetic field and electric field)). The coil shield portions 6 and 7 are arranged in contact with side surface portions 30A and 30B, which are end faces of the plurality of detection coils 30 and 35 on the axial direction L side of the rotation shaft.

The coil shield parts 6 and 7 of the present embodiment are made of, for example, aluminum, which is a conductive material. The coil shield parts 6 and 7 may be formed of, for example, an alloy of aluminum and another metal material. The coil shield parts 6 and 7 may be made of any substance as long as it has a function of shielding electromagnetic noise.

The coil shield portion 6 on one side covers only the side surface portion 30A of the detection coils 30 and 35. That is, the coil shield portion 6 on one side has an outer diameter that substantially matches the inner diameter of the magnetic ring 8 and an inner diameter that substantially matches the arrangement surface 20A on the bobbin 20 on which the insulated wires of the detection coils 30 and 35 are arranged. It has a ring shape.

The coil shield portion 7 on the other side covers all of the side surface portions 30B of the detection coils 30 and 35, the end surface of the bobbin 20, and the end surface of the magnetic ring 8. That is, the coil shield portion 7 on the other side is configured in a ring shape having an outer diameter substantially matching the outer diameter of the magnetic ring 8 and an inner diameter substantially matching the inner diameter of the bobbin 20.

[1-2. Peripheral configuration of torque sensor]
In the torque sensor 1, the terminal section 50 is electrically connected to the measuring section 41 described later. The terminal section 50 and the measuring section 41 are connected by a shield wire 53 as shown in FIGS. However, the terminal portion 50 and the shield wire 53 are connected via an insulated electric wire 52 extending from the shield wire 53.

The insulated electric wire 52 constitutes the shielded wire 53 and is a conductor wire with a coating. The insulated wire 52 includes a conductor and an insulating coating that covers the conductor. The shielded wire 53 is formed by covering the periphery of the plurality of insulated wires 52 (four insulated wires 52 in this embodiment) with a structure (for example, SUS braid) that shields electromagnetic noise and a sheath. The insulated electric wire 52 extending from the shielded wire 53 is a portion of the insulated electric wire 52 that is exposed by removing the structure for shielding the electromagnetic noise and the sheath from the shielded wire 53.

In the present embodiment, the terminal shield portion 60 is provided around the insulated electric wire 52 extending from the terminal portion 50 and the shield wire 53 in order to improve resistance to electromagnetic noise.
The terminal shield part 60 is made of metal such as aluminum or aluminum alloy having a function of shielding electromagnetic noise. As shown in FIG. 5, the terminal shield part 60 covers at least the periphery of the terminal part 50, and in the present embodiment, covers the periphery of the part from the terminal part 50 to the insulated wire 52.

As shown in FIG. 6, the torque sensor 1 in which the terminal shield portion 60 is arranged is resin-molded so that the entire torque sensor 1 is covered with the resin member 62. However, the shield wire 53 is configured to extend outward from the resin member 62.

The torque sensor 1 resin-molded in this way is disposed on the rotary shaft 2 and connected to the measuring unit 41 for use.
[1-3. Configuration of measuring unit]
As shown in FIG. 7, the torque sensor 1 includes a measurement unit 41 that measures the torque applied to the rotating shaft 2 by detecting the change in the inductance of the first detection coil 30 and the second detection coil 35. There is. Hereinafter, the inductances of the pair of coils forming the first detection coil 30 are L1 and L4, and the inductances of the pair of coils forming the second detection coil 35 are L2 and L3.

The measurement unit 41 includes a bridge circuit 42, an oscillator 43, a voltage measurement circuit 44, and a torque calculation unit 45. The bridge circuit 42 is configured by sequentially connecting the detection coils 30 and 35 in a ring shape.

The oscillator 43 applies an AC voltage between the contact a between the detection coils 30 and 35 and the contact b between the detection coils 30 and 35. The voltage measuring circuit 44 detects the voltage between the contact point c between the detection coils 30 and 35 and the contact point d between the detection coils 30 and 35.

The torque calculator 45 calculates the torque applied to the rotating shaft 2 based on the voltage measured by the voltage measuring circuit 44. In the measuring unit 41, when the torque is not applied to the rotating shaft 2, the inductances L1 to L4 of the detection coils 30 and 35 are equal to each other, and the voltage detected by the voltage measuring circuit 44 is substantially zero.

Here, when torque is applied to the rotary shaft 2, the magnetic permeability in the +45 degree direction with respect to the axial direction L decreases or increases, and the magnetic permeability in the −45 degree direction with respect to the axial direction L increases or decreases. To do. Therefore, when torque is applied to the rotating shaft 2 with the AC voltage applied from the oscillator 43, the inductance of the first detection coil 30 decreases or increases, and the inductance of the second detection coil 35 increases or decreases. As a result, the voltage detected by the voltage measurement circuit 44 changes, and the torque calculation unit 45 calculates the torque applied to the rotary shaft 2 based on this change in voltage.

Since the detection coils 30 and 35 of each layer have the same configuration except that the winding directions are different, the influence of the temperature on the inductance of the detection coils 30 and 35 is canceled by using the bridge circuit 42 as shown in FIG. It is possible to accurately detect the torque applied to the rotary shaft 2. Further, in the torque sensor 1, when the inductance increases or decreases in the first detection coil 30, the inductance decreases or increases in the second detection coil 35 without fail. Therefore, by using the bridge circuit 42 as shown in FIG. The sensitivity can be further improved.

[1-4. Experimental result]
It was confirmed by experiments that the torque sensor 1 of the present embodiment has good characteristics. 8 is a graph showing the relationship between torque and sensor sensitivity, FIG. 9 is a graph showing the relationship between torque and hysteresis error, and FIG. 10 is a graph showing the relationship between torque and the degree of variation in sensor sensitivity.

Note that the hysteresis error represents a relative reversibility error, that is, a difference between characteristic curves obtained when the load is increased and when the load is decreased. The smaller the hysteresis error value, the better.

In this experiment, as shown in FIG. 4, various torque sensors including the torque sensor 1 of the present embodiment are mounted on a resin fixed base or an aluminum fixed base 65, and the rotary shaft 2 is installed in the torque sensor. Was placed through. Then, torque was applied to the rotating shaft 2 to measure variations in sensor sensitivity, hysteresis error, and sensor sensitivity. The fixed base 65 holds the torque sensor while surrounding the outer peripheral side of the torque sensor. The aluminum fixed base covers the outer peripheral side of the torque sensor with aluminum, and the resin fixed base covers the outer peripheral side of the torque sensor with resin.

In this experiment, a torque sensor not including the coil shield parts 6 and 7 of the present embodiment using a resin fixing base is referred to as a “sensor fixing base (resin)”, and an aluminum fixing base is used in the present embodiment. The torque sensor including the aluminum coil shield portions 6 and 7 similar to the embodiment is referred to as “sensor fixing base (Al)+side surface Al shield”. Further, a torque sensor provided with a shield part made of a dust core using an aluminum fixing base is referred to as “sensor fixing base (Al)+side surface dust core shield”, and a resin fixing base is used in the present embodiment. The configuration that holds the torque sensor 1 is described as "resin fixing base + side shield".

Regarding "resin fixing base + side shield", "sensor fixing base (resin)", "sensor fixing base (Al) + side surface Al shield" are measured only when the torque applied to the rotary shaft 2 is ±300 Nm. ", and "sensor fixing stand (Al) + side surface dust core shield" were measured when torque applied to the rotary shaft 2 was ±50 Nm, ±150 Nm, and ±300 Nm.

Regarding the sensor sensitivity, as shown in FIG. 8, an output of approximately 5.6 mV/Nm was obtained for any torque and torque sensor. That is, it can be seen that the presence or absence of the side shield part has almost no effect on the sensor sensitivity.

As for the hysteresis error, as shown in FIG. 9, it was found that the error tends to increase as the torque increases. When the torque applied to the rotating shaft 2 is ±300 Nm, the hysteresis error of the “resin fixing base+side shield” that is the torque sensor 1 of the present embodiment is smaller than that of the “sensor fixing base (resin)”. That is, it is understood that the hysteresis error is reduced (effective) by the coil shield portions 6 and 7 that cover the side surfaces of the detection coils 30 and 35. Further, when the torque applied to the rotary shaft 2 is ±300 Nm, the hysteresis error of the “resin fixing base+side shield” which is the torque sensor 1 of the present embodiment is “sensor fixing base (Al)+side Al shield”. Was equivalent to. From this, it can be understood that the necessity of providing the shield portion on the outer circumference of the magnetic ring 8 is low.

Regarding the degree of variation in the sensor sensitivity, as shown in FIG. 10, the “resin fixing base+side shield” and the “sensor fixing base (Al)+side Al shield” including the coil shield portions 6 and 7 of the present embodiment are used. , The variation was smaller than other configurations, and good results were obtained.

Next, the influence of the magnetic field generated when operating the torque motor was measured using the measuring device 70 shown in FIG. The torque motor is an electric motor that drives the rotary shaft 2 to rotate, and applies torque to the rotary shaft 2. A torque motor was arranged at a distance of about 1 m from the torque sensor 1. As shown in FIG. 11, the measuring device 70 includes a torque meter 71, a connection unit 72, a drive detection circuit 73, an AD board 74, and a calculation unit 75.

The torque meter 71 is a sensor that measures the torque applied to the rotary shaft 2 from the torque motor. The connection portion 72 is a part of a path for sending a signal transmitted through the shielded wire 53 to the drive detection circuit 73. The connection part 72 is configured by assembling a connector, for example.

The drive detection circuit 73 detects the torque applied to the rotary shaft 2 based on the signal detected by the torque sensor 1 as in the case of the measurement unit 41 described above. The AD board 74 has a function of a well-known analog/digital converter. The AD board 74 converts the analog signal from the torque meter 71 into a digital signal, converts the analog signal from the drive detection circuit 73 into a digital signal, and sends the digital signal to the calculation unit 75.

The calculation unit 75 is configured as a known calculation device such as a personal computer. The calculation unit 75 outputs the torque measured by the torque meter 71 and the torque measured by the torque sensor 1 in time series.

By using such a measuring device 70, the output from the torque sensor in the state where the power supply of the torque motor is turned on and the torque motor is not driven (the torque is not applied to the rotating shaft 2 from the torque motor) is checked. It was The power supply to the torque motor is turned on about 9 seconds after the start of measurement. From about 9 seconds after the start of measurement to about 30 seconds, the power of the torque motor is turned on and the torque motor is not driven. The state in which the power source of the torque motor is turned on indicates a standby state in which the torque motor can be operated at any time, for example, a state in which only an exciting current is supplied to the exciting torque motor.

In this experiment, in the torque sensor 1 of the present embodiment, as shown in FIG. 12, the output from the torque sensor 1 did not significantly change before and after the power supply to the torque motor was turned on, and the output was stable at less than ±20 mV. On the other hand, in the torque sensor of the comparative example that does not include the coil shield parts 6 and 7 of the present embodiment, as shown in FIG. 13, after the power supply of the torque motor is turned on, an output of about −80 mV is generated from the torque sensor 1. .. That is, in the torque sensor of the comparative example, due to the influence of the magnetic field generated in the torque motor, the same output as when the torque was applied was generated although the torque was not applied to the rotary shaft 2.

From these results, the coil shield portions 6 and 7 that cover the side surfaces of the detection coils 30 and 35 are effective in shielding the electromagnetic noise generated from the torque motor, and the shield portions are provided around the detection coils 30 and 35. It can be seen that the necessity of providing it is low.

[1-5. effect]
According to the embodiment described in detail above, the following effects are achieved.
(1a) One aspect of the present disclosure is a torque sensor 1 that measures a torque applied to a rotating shaft having a magnetostrictive characteristic, and includes a plurality of detection coils 30, 35, a measuring unit 41, a coil shield unit 6, and a coil shield unit 6. 7 and a magnetic ring 8.

The plurality of detection coils 30 and 35 are configured by winding an insulated wire around the rotary shaft at a predetermined distance from the rotary shaft. The coil shield portions 6 and 7 are formed of a material that suppresses the transmission of electromagnetic waves, and cover at least a part of the side surface portions 30A and 30B that are end surfaces of the plurality of detection coils 30 and 35 on the axial direction L side of the rotation shafts. The measurement unit 41 measures the torque applied to the rotating shaft by detecting the change in the inductance of the plurality of detection coils 30 and 35. The magnetic ring 8 is arranged on the outer peripheral side of the plurality of detection coils and has a magnetic body formed in a hollow cylindrical shape. A member having a material that allows transmission of electromagnetic waves is arranged on the outer peripheral side of the magnetic ring 8.

With such a configuration, by covering the side surface portions 30A and 30B of the plurality of detection coils 30 and 35 with the shield portion, it is possible to reduce the influence of the electromagnetic noise on the detection coils 30 and 35. Further, according to such a configuration, the outer peripheral side of the magnetic ring 8 is not covered with the member that blocks the transmission of electromagnetic waves, so that the hysteresis error of the torque sensor can be suppressed.

Further, according to such a configuration, since the magnetic ring 8 is provided, it is possible to suppress the magnetic flux generated in the detection coils 30 and 35 from leaking to the outside, and it is possible to suppress the deterioration of the sensor sensitivity.

(1b) In one aspect of the present disclosure, the coil shield parts 6 and 7 may be arranged in contact with the side surface parts 30A and 30B.
According to such a configuration, since the coil shield portions 6 and 7 are arranged in contact with the side surface portions 30A and 30B, it is possible to further suppress electromagnetic noise from entering the detection coils 30 and 35.

(1c) In one aspect of the present disclosure, the coil shield portions 6 and 7 may cover all of the side surface portions 30A and 30B where the insulated wire is arranged.
According to such a configuration, the coil shield portions 6 and 7 cover the entire area of the side surface portions 30A and 30B where the insulated wires are arranged, so that electromagnetic noise is further suppressed from entering the detection coils 30 and 35. be able to.

(1d) One aspect of the present disclosure may further include a terminal portion 50 and a metal terminal shield portion 60. An electric wire that is electrically connected to the insulated electric wire is connected to the terminal portion 50. The terminal shield part 60 covers the periphery of the terminal part 50.

According to such a configuration, since the terminal shield part 60 made of metal is provided, it is possible to prevent electromagnetic noise from entering the terminal part 50.
[2. Other Embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be implemented.

(2a) In the above embodiment, the coil shield parts 6 and 7 are arranged in contact with the side surface parts 30A and 30B, but the invention is not limited to this. For example, the coil shield parts 6 and 7 may be arranged apart from the side surface parts 30A and 30B by a predetermined distance.

(2b) In the above-described embodiment, the coil shield portions 6 and 7 are configured to cover all of the side surface portions 30A and 30B where the insulated wire is arranged, but the present invention is not limited to this. For example, the coil shield parts 6 and 7 only need to cover at least a part of the regions where the insulated wires are arranged in the side surface parts 30A and 30B.

(2c) A plurality of functions of one constituent element in the above embodiment may be realized by a plurality of constituent elements, or one function of one constituent element may be realized by a plurality of constituent elements. .. Further, a plurality of functions of a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. Moreover, you may omit a part of structure of the said embodiment. Further, at least a part of the configuration of the above-described embodiment may be added or replaced with the configuration of the other above-described embodiment. Note that all aspects included in the technical idea specified by the wording recited in the claims are embodiments of the present disclosure.

(2d) In addition to the torque sensor described above, the present disclosure can be realized in various forms such as a system including the torque sensor.

DESCRIPTION OF SYMBOLS 1... Torque sensor, 2... Rotation axis, 5... Magnetostrictive torque sensor coil, 6... Coil shield part, 7... Coil shield part, 8... Magnetic ring, 9... Terminal holding part, 20... Bobbin, 20A... Arrangement surface , 30... First detection coil, 30A, 30B... Side surface part, 35... Second detection coil, 41... Measuring part, 50... Terminal part, 52... Insulated wire, 53... Shield wire, 60... Terminal shield part, 62... Resin member, 65... Fixed base, 70... Measuring device.

Claims (5)

A vehicle torque sensor for measuring torque applied to a rotating shaft having a magnetostrictive characteristic,
A plurality of detection coils formed by winding insulated wires around the rotating shaft at a preset distance from the rotating shaft;
A coil shield part formed of a material that suppresses the transmission of electromagnetic waves that covers at least a part of a side surface part that is an end surface on the axial side of the rotating shaft in the plurality of detection coils,
By detecting a change in inductance in the plurality of detection coils, a measuring unit that measures the torque applied to the rotating shaft,
A magnetic ring having a magnetic body formed in a hollow cylindrical shape, which is arranged on the outer peripheral side of the plurality of detection coils,
Equipped with
A member having a material that allows transmission of electromagnetic waves is arranged on the outer peripheral side of the magnetic ring. The vehicle torque sensor according to claim 1, wherein
A torque sensor in which the coil shield portion is arranged in contact with the side surface portion. The vehicle torque sensor according to claim 1 or 2, wherein
The coil shield portion is a torque sensor that covers the entire area of the side surface where the insulated wire is arranged. The vehicle torque sensor according to any one of claims 1 to 3, wherein:
A terminal portion to which an electric wire electrically connected to the insulated electric wire is connected,
A terminal shield portion formed of a conductive material that covers the periphery of the terminal portion,
A torque sensor further comprising: The vehicle torque sensor according to any one of claims 1 to 4, wherein:
The member having a material that allows transmission of electromagnetic waves is a torque sensor made of a non-metallic material.