Steering device

Abstract

Provided is a technique for a steering device capable of detecting a holding state without being affected by deterioration of a coating film while ensuring flexibility. The steering device includes: a rotating portion; and a grip portion connected to the rotating portion and gripped by an occupant, the grip portion including: a core portion; and a cover part that covers the core part and includes a first layer that is disposed near the core part with respect to the second layer and the third layer and that has conductivity, a second layer that is disposed between the first layer and the third layer and that is formed of a flexible material that does not have conductivity, and a third layer that is exposed to the outside at the grip part and that is formed of a flexible material that does not have conductivity. The steering device is provided with: a detector that detects a change in capacitance between the first layer and an occupant holding the grip section, the first layer being formed of a material that does not have conductivity, and the detector being configured to detect a change in capacitance between the occupant holding the grip section and the first layer; and a control unit that determines the gripping state of the gripping unit on the basis of the change in capacitance detected by the detector.

Description

Technical Field

[0001] The invention relates to a steering device. Background Art

[0002] Regarding the steering wheel of Patent Document 1, a conductive material is included in the skin material covering the core covering part. The core covering part covers the core. The skin material includes: a base material layer, which is attached to the core covering part; an elastomer layer, which is laminated on the base material layer; and a coating layer, which is applied to the elastomer layer. The elastomer layer uses a flexible elastomer material, a rubber material, polyvinyl chloride, etc. as a material. The coating layer is formed by applying a coating containing polyurethane resin, acrylic resin, silicone resin, fluororesin, etc. The conductive material is included in the elastomer layer and the coating layer. In Patent Document 1, the elastomer layer and the core are used as electrodes respectively, and the driver's gripping condition of the steering wheel is detected based on the change in capacitance of the capacitance sensor that detects the capacitance therebetween. Regarding the steering wheel of Patent Document 1, the softness of the skin material is ensured by the elastomer layer. In addition, regarding the steering wheel of Patent Document 1, the conductive material is included in the coating layer, and the conductive material is present at a position close to the driver's hand, so that the gripping condition can be detected together with the elastomer layer containing the conductive material.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-992

[0004] In Japanese Patent Publication No. 2019-992, the following scheme is considered, that is, by plating the elastomer layer, the elastomer layer contains a conductive material. It is generally known that by plating the elastomer layer, the flexibility of the elastomer layer is reduced compared to the method without plating. In addition, it is generally known that the coating of the steering wheel is a part in contact with the air, so it is easy to deteriorate. Therefore, the following steering device is desired, that is, it is possible to ensure flexibility and detect the gripping condition without being affected by the degradation of the coating. Summary of the invention

[0005] The present invention can be implemented as the following aspects.

[0006] (1) According to one embodiment of the present invention, a steering device is provided. The steering device is provided on a mobile body, and comprises: a rotating part rotatably mounted on the mobile body; and a gripping part connected to the rotating part and gripped by a passenger, the gripping part comprising: a core part disposed on both sides across the rotating part; and a covering part covering the core part and including a first layer, a second layer, and a third layer, the first layer being disposed at a position close to the core part relative to the second layer and the third layer and having conductivity, the second layer being disposed between the first layer and the third layer and being formed of a non-conductive and flexible material, the third layer being exposed to the outside at the gripping part and being formed of a non-conductive material, the steering device further comprising: a detector detecting a change in capacitance between the passenger gripping the gripping part and the first layer; and a control part determining a gripping condition of the gripping part based on the change in capacitance detected by the detector.

[0007] According to the steering device of this method, the first layer has conductivity, so that the gripping condition of the gripping portion is detected based on the change in the capacitance of the first layer. For example, compared with a method in which the second layer is formed of a flexible material and the third layer, which is a portion that contacts the occupant and is easily in contact with the air, contains a conductive material, the softness of the covering portion can be ensured, and the gripping condition can be detected without being affected by the deterioration of the third layer.

[0008] (2) In the steering device of the above aspect, the first layer may be fixed to the core portion by a double-sided tape or an adhesive, and the second layer may be fixed to the first layer by a double-sided tape or an adhesive.

[0009] If the first layer having the conductive material contacts the air, the accuracy of the detection electrode as the first layer may be reduced due to the decrease in the dielectric constant of the air. According to the steering device of this mode, the first layer is fixed to the core body portion by a double-sided tape or an adhesive. In addition, the second layer is bonded to the first layer by a double-sided tape or an adhesive. Thus, for example, compared with a mode in which the first layer is sewn to the core body portion, it is possible to suppress the first layer from contacting the air, thereby suppressing the reduction in accuracy.

[0010] (3) In the steering device of the above aspect, a heater layer may be provided between the core portion and the cover portion, the heater layer may include a heating wire, and the heating wire may be configured to be energized.

[0011] For example, in a method in which the first layer is not conductive and a conductive material is separately arranged between the covering portion and the core portion relative to the first layer, in order to detect capacitance, the conductive material is preferably in contact with the covering portion. Therefore, in a case where the steering device has a heater layer that can further generate heat, the heater layer is mostly arranged between the conductive material and the core portion. In this case, it is possible that the heat of the heater layer is difficult to conduct to the covering portion. According to the steering device of this method, the heater layer is arranged between the covering portion and the core portion, so the heat of the heater layer is easily conducted to the covering portion. The grip portion can be effectively heated up.

[0012] (4) In the steering device of the above aspect, the first layer may be fixed to the heater layer by a double-sided tape or an adhesive, and the second layer may be fixed to the first layer by a double-sided tape or an adhesive.

[0013] If the first layer having the conductive material contacts the air, the dielectric constant of the air may decrease, which may reduce the accuracy of the detection electrode as the first layer. According to the steering device of this mode, the first layer is fixed to the heater layer by a double-sided tape or an adhesive. In addition, the second layer is fixed to the first layer by a double-sided tape or an adhesive. Thus, for example, compared with a mode in which the first layer overlaps only with the heater layer, it is possible to suppress the first layer from contacting the air, thereby suppressing the reduction in accuracy.

[0014] The present invention can be implemented in various forms other than the steering device, for example, in the form of a grip, a vehicle having the steering device, a method for manufacturing the steering device, a method for manufacturing the grip, and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the steering device according to this embodiment.

[0016] Figure 2 yes Figure 1 Sectional view II-II.

[0017] Figure 3 It is a block diagram showing the structure of the control unit.

[0018] Figure 4 It is a diagram showing a cross section of a grip portion according to a second embodiment. DETAILED DESCRIPTION

[0019] A. First Implementation Method:

[0020] Figure 11 is a schematic diagram of a steering device 1 of the present embodiment. The steering device 1 is provided on a mobile body. In the present embodiment, the steering device 1 is provided on a vehicle. The steering device 1 is a device operated by a driver who is a passenger of the vehicle. The steering device 1 is connected to the rotation axis AR of the vehicle and is configured to be rotatable around the axis AX of the rotation axis AR. The rotation of the steering device 1 is transmitted to a steering gear box not shown in the figure via the rotation axis AR. For convenience, the direction along the axis AX of the rotation axis AR is recorded as the front-rear direction. The direction in which the steering device 1 stands upright in the direction orthogonal to the axis AX is recorded as the up-down direction. The direction of 12 o'clock is centered on the rotation axis AR at the top. The direction of 6 o'clock is centered on the rotation axis AR at the bottom. The direction orthogonal to the axis AX and the up-down direction is recorded as the left-right direction. The direction of 3 o'clock is centered on the rotation axis AR to the right. The direction of 9 o'clock is centered on the rotation axis AR to the left. The steering device 1 has a grip 10, a rotating portion 20, a detector 30, and a control portion 40.

[0021] The grip portion 10 is a portion gripped by the driver. In the present embodiment, the grip portion 10 has an approximately annular shape when viewed in the front-rear direction. The grip portion 10 is connected to the rotating portion 20 on the inner circumference of the grip portion 10. The grip portion 10 covers a portion of the rotating portion 20. Thus, the grip portion 10 is connected to the rotating portion 20. The grip portion 10 has a core portion 110 and a covering portion 120. Figure 1 In FIG. 1 , the core portion 110 is indicated by a dotted line.

[0022] Figure 2 yes Figure 1 The core portion 110 is a portion constituting the skeleton of the grip portion 10. Figure 1 As shown, the core body 110 is arranged on both sides of the rotating part 20 when viewed in the front-rear direction. Figure 2 As shown, the core portion 110 has a core 111 and a core covering portion 112. The core 111 has a ring shape when viewed in the front-to-back direction. The core 111 is formed of metal and has conductivity. The core 111 is formed, for example, of iron, aluminum, magnesium, or an alloy thereof. The core 111 is grounded. The core covering portion 112 covers the core 111. The core covering portion 112 is formed of an insulating material other than metal. The core covering portion 112 can be formed, for example, by insert molding using a soft material such as foamed polyurethane or an elastic material. In addition, the core covering portion 112 can also be formed of a hard material.

[0023] The covering portion 120 covers the core portion 110. Figure 2As shown in FIG. 1 , the cover 120 is the outermost layer of the grip 10 and is the portion held by the driver. The cover 120 includes a first layer 121, a second layer 122, and a third layer 123. The first layer 121 functions as a capacitive sensor for detecting capacitance generated between the first layer 121 and the driver holding the grip 10. Figure 1 The first layer 121 is electrically connected to the detector 30 by the lead wire LR shown. Figure 2 As shown, the first layer 121 is arranged at a position close to the core 110 relative to the second layer 122 and the third layer 123. In this embodiment, the first layer 121 is bonded to the core 110 by a double-sided tape 50. The first layer 121 is formed by metal plating a fiber cloth. In this embodiment, a synthetic fiber formed of polyester is used as the fiber cloth. For example, a metal such as copper, nickel, tin, and silver is selected as the conductive material.

[0024] The second layer 122 is a portion for making the driver who holds the grip portion 10 feel softness. The second layer 122 is arranged between the first layer 121 and the third layer 123. In the present embodiment, the second layer 122 is laminated on the first layer 121 by the double-sided tape 51. The second layer 122 is formed of a material that is not conductive but has flexibility. In the present embodiment, the second layer 122 is formed of PET (Polyethylene terephthalate). The third layer 123 protects the surface of the second layer 122. The third layer 123 is exposed to the outside of the grip portion 10 and is a portion that contacts the driver. The third layer 123 is laminated on the second layer 122 by the double-sided tape 52. The third layer 123 is formed of a material that is not conductive. In the present embodiment, the third layer 123 is formed of a coating including silicone resin, acrylic resin, polyurethane resin, etc.

[0025] Figure 1 The rotating part 20 shown is mounted on the vehicle in a rotatable manner. The rotating part 20 is arranged at a position surrounded by the grip part 10. The rotating part 20 has a shape with a space inside. The space inside the rotating part 20 is provided with a detector 30, a control unit 40, an airbag (not shown), various circuits, etc.

[0026] The detector 30 detects the capacitance between the driver holding the grip portion 10 and the first layer 121. The detector 30 detects the change in capacitance between the driver holding the grip portion 10 and the first layer 121 based on the detected capacitance. The detector 30 has various circuits such as an oscillation circuit, a resonance circuit, a detection circuit, and an amplifier circuit to detect the change in capacitance. Specifically, if the grip portion 10 is held by the driver, the capacitance between the first layer 121 as a detection electrode and the driver changes relative to the capacitance when the grip portion 10 is not held. With respect to the detector 30, the resonant frequency that changes with the change in capacitance is amplitude modulated. The original signal is taken out from the amplitude modulated signal, amplified, and output as a voltage. Information on the voltage value is sent from the detector 30 to the control unit 40.

[0027] Figure 3 40 is a block diagram showing the structure of the control unit 40. Figure 3 As shown, the control unit 40 is composed of a CPU as a processor, a RAM and a ROM. The ECU (Electronic Control Unit) realizes various functions by executing pre-installed programs. The control unit 40 controls the steering device 1 based on the voltage value sent from the detector 30 and the instruction of the vehicle ECU (not shown).

[0028] The control unit 40 determines the gripping condition of the gripping portion 10 based on the capacitance detected by the detector 30. The control unit 40 determines whether the gripping portion 10 is gripped by the driver based on the capacitance detected by the detector 30. Specifically, the control unit 40 compares the voltage value of the detection result with a preset threshold value, and detects whether the gripping portion 10 is gripped based on the comparison result.

[0029] The control unit 40 further controls the airbag, notifies the driver, etc. When the driver releases his hand from the grip 10 while the vehicle is running, the control unit 40 notifies the driver, etc., that the driver's hand has left the grip 10 by means of a buzzer, etc., and via a speaker or monitor (not shown).

[0030] In the steering device 1 of the present embodiment, the first layer 121 has conductivity, and the gripping condition of the gripping portion 10 is detected based on the change in capacitance of the first layer 121. For example, compared with a method in which a conductive material is included in the second layer 122 formed of a flexible material or in the third layer 123 which is a portion in contact with a driver as a passenger and is easily in contact with the air, the gripping condition can be detected while ensuring the flexibility of the covering portion 120 and without being affected by the deterioration of the third layer 123.

[0031] The inventors of the present application have found that the metal-plated fiber cloth has similar stretch properties to the second layer 122 and the third layer 123. By using the metal-plated fiber cloth as the first layer 121, it is possible to suppress poor appearance due to wrinkles caused by the difference in stretchability with the second layer 122 and deterioration of the function of the capacitive sensor of the first layer 121.

[0032] In addition, compared with, for example, a method in which a capacitive sensor is disposed between the cover 120 and the core 110 in addition to the first layer 121, the number of components of the steering device 1 can be reduced. Therefore, when manufacturing the steering device 1, the assembly man-hours of the components can be reduced. Human errors and equipment malfunctions accompanying manufacturing can be suppressed. Furthermore, compared with a method in which a capacitive sensor is disposed between the cover 120 and the core 110 in addition to the first layer 121, the steering device 1 has fewer structures, so the possibility of malfunctions can be reduced.

[0033] If the first layer 121 having a conductive material comes into contact with the air, the dielectric constant of the air may decrease, which may cause the accuracy of the detection electrode of the first layer 121 to decrease. In the steering device 1 of the present embodiment, the first layer 121 is bonded to the core portion 110 by the double-sided tape 50. In addition, the second layer 122 is stacked on the first layer 121 by the double-sided tape 51. Thus, compared with, for example, a method in which the first layer 121 is sewn to the core portion 110 or a method in which the second layer 122 overlaps the first layer 121, it is possible to suppress the first layer 121 from coming into contact with the air, thereby suppressing the decrease in accuracy.

[0034] B. Second Implementation Method:

[0035] Figure 4 It is a diagram showing a cross section of a grip portion 10B according to the second embodiment. Figure 4 and Figure 2 The second embodiment is different from the first embodiment in that the grip portion 10B includes a heater layer 60 .

[0036] The heater layer 60 generates heat by being energized, thereby raising the temperature of the gripping portion 10B. The heater layer 60 is disposed between the core portion 110 and the covering portion 120. In the present embodiment, the heater layer 60 is mounted on the surface of the core portion 110 by a double-sided tape 53. In addition, the heater layer 60 is bonded to the first layer 121 by a double-sided tape 54. In the present embodiment, the heater layer 60 is formed by configuring a heating wire on a nonwoven fabric. The heating wire is configured to be energized by an electric wire not shown in the figure. The energization is performed by the control of the control unit 40.

[0037] The control unit 40 of the second embodiment switches the ON / OFF control of the power supply to the heater layer 60 based on the gripping condition of the gripping portion 10B. For example, when it is determined that the gripping portion 10B is not gripped by the driver, the control unit 40 switches the power supply to the heater layer 60 to the OFF control. For example, when it is determined that the gripping portion 10B is gripped for a period greater than or equal to a predetermined number of seconds, the control unit 40 switches the power supply to the heater layer 60 to the ON control.

[0038] For example, in a method in which the first layer 121 is not conductive and a conductive material is arranged between the cover 120 and the core 110 differently from the first layer 121, in order to detect capacitance, it is preferable that the conductive material is in contact with the cover 120. Therefore, in a case where the steering device 1 has a heater layer 60 that can further generate heat, it is conceivable that the heater layer 60 is often arranged between the conductive material and the core 110. In this case, the heat of the heater layer 60 may be difficult to conduct to the cover 120. According to the steering device 1 of the second embodiment, the heater layer 60 is arranged between the cover 120 and the core 110, so the heat of the heater layer 60 is easily conducted to the cover 120. The grip 10B can be efficiently heated.

[0039] According to the steering device 1 of the second embodiment, the first layer 121 is bonded to the heater layer 60 by the double-sided tape 54. In addition, similarly to the first embodiment, the second layer 122 is laminated on the first layer 121 by the double-sided tape 51. Thus, for example, compared with a configuration in which the first layer 121 overlaps only the heater layer 60, it is possible to suppress the first layer 121 from contacting the air, and thus it is possible to suppress a decrease in the accuracy of the detection electrode as the first layer 121.

[0040] C. Other implementations:

[0041] C1. Other implementations 1:

[0042] (1) In the above-mentioned embodiment, the steering device 1 is provided in a vehicle. In addition, the steering device may be provided in a mobile body other than a vehicle, such as a ship or an aircraft.

[0043] (2) In the above embodiment, the grip portion 10 has a substantially annular shape when viewed in the front-to-back direction. For example, the grip portion may have a rectangular or trapezoidal shape when viewed in the front-to-back direction. For example, the grip portion may have a substantially rectangular parallelepiped shape surrounding the rotating portion.

[0044] (3) In the above embodiment, the first layer 121 is formed by applying metal plating to the surface of the fiber cloth. For example, the first layer may be formed by a blank woven from metal wires. For example, the first layer may be a metal fiber such as steel wool, or may be a structure woven together with metal wires and fiber cloth. In the method of applying metal plating to the surface of the fiber cloth, the elasticity is maintained compared to the blank woven from metal wires.

[0045] (4) In the above embodiment, synthetic fibers made of polyester are used as the fiber cloth. In addition, for example, synthetic fibers made of nylon, acrylic, polyurethane, etc. can be used as the fiber cloth, and natural fibers, plant fibers, animal fibers, etc. can also be selected.

[0046] (5) For example, a combination of a first layer formed of a fiber cloth subjected to metal plating and a non-first layer formed of a fiber cloth not subjected to metal plating may be arranged on the surface of the core body. The first layer subjected to metal plating may be arranged at a gripping portion where the occupant is more likely to grip, and the non-first layer may be arranged at other portions.

[0047] (6) In the above embodiment, the second layer 122 is formed of PET (Polyethylene terephthalate). Alternatively, the second layer may be formed of a rubber material, an elastomer material, or the like.

[0048] (7) In the above embodiment, the control unit 40 controls the airbag, notifies the driver, etc. For example, if the control unit determines that the gripping portion is not gripped within a certain period of time after the notification, the control unit may send a signal to the ECU to stop the vehicle.

[0049] (8) For example, the gripping portion may include a shielding layer and an insulating layer between the first layer and the core portion. The shielding layer is electrically connected to the first layer via a voltage follower circuit or the like, and is controlled to have the same potential as that of the first layer. Therefore, no charge is accumulated in the first layer and the shielding layer, and the first layer does not function as a part of a capacitor composed of the first layer, the insulating layer, the shielding layer, and the core portion. As a result, the noise of the capacitance caused by the potential difference generated between the first layer and the core portion can be removed from the capacitance detected by the detector.

[0050] In the embodiment in which the grip portion has an insulating layer and a shielding layer, the insulating layer is a flexible substrate having insulating properties disposed between the first layer and the shielding layer. The insulating layer is made of, for example, a flexible film such as polyimide or PET.

[0051] C2. Other implementation methods 2:

[0052] (1) In the above embodiment, the first layer 121 is bonded to the core portion 110 by the double-sided tape 50, and the second layer 122 is stacked on the first layer 121 by the double-sided tape 51. In addition, for example, the first layer can be fixed to the core portion by an adhesive, and the second layer can be fixed to the core portion by an adhesive. As the adhesive, a material mainly composed of an elastomeric material, a rubber material, or polyvinyl chloride can be used. For example, acrylic, styrene, silicone, olefin, polyurethane, and epoxy can be used for the elastomeric material. For the rubber material, butadiene rubber, silicone rubber, ethylene propylene rubber, and chloroprene rubber can be used. In this method, for example, compared with the method in which the first layer is sewn to the core portion, it is also possible to suppress the first layer from contacting the air, thereby suppressing the reduction in accuracy.

[0053] (2) For example, the second layer may be attached to the first layer by a double-sided tape or adhesive, and the first layer may be sewn to the core. Alternatively, the first layer may be attached to the core by a double-sided tape or adhesive, and the second layer may be fixed by overlapping the first layer without using the double-sided tape or adhesive. In this manner, it is possible to suppress a decrease in the accuracy of the detection electrode as the first layer, as compared to a manner in which the first layer is sewn to the core and the second layer overlaps the first layer.

[0054] (3) For example, the first layer may be fixed to the core by welding or adhesive. Also, for example, the second layer may be fixed to the first layer by welding or adhesive.

[0055] C3. Other implementation methods 3:

[0056] (1) In the second embodiment described above, the heater layer 60 has a heating wire. Alternatively, for example, the heater layer may be formed of a flexible sheet material in which a heating element is arranged in a resin material.

[0057] (2) In the second embodiment, the control unit 40 switches the ON / OFF control of the power supply to the heater layer 60 based on the gripping condition of the gripping unit 10. In addition, for example, the control unit may control the heater layer not based on the gripping condition of the gripping unit. For example, the control unit may continue to control the power supply to the heater layer to be ON while the vehicle is running, and switch the power supply to the heater layer to be OFF when the power supply of the vehicle is cut off.

[0058] C4. Other implementation methods 4:

[0059] (1) In the above-mentioned second embodiment, the first layer 121 is bonded to the heater layer 60 by the double-sided tape 54, and the second layer 122 is stacked on the first layer 121 by the double-sided tape 51. In addition, for example, the first layer can be fixed to the heater layer by an adhesive, and the second layer can be fixed to the core portion by an adhesive. As the adhesive, a material mainly composed of an elastomeric material, a rubber material, or polyvinyl chloride can be used. For the elastomeric material, for example, acrylic, styrene, silicone, olefin, polyurethane, and epoxy can be used. For the rubber material, butadiene rubber, silicone rubber, ethylene propylene rubber, and chloroprene rubber can be used. In this method, for example, compared with a method in which the first layer only overlaps the heater layer, it is possible to suppress the first layer from contacting the air, and thus it is possible to suppress the reduction in the accuracy of the detection electrode as the first layer.

[0060] (2) For example, the second layer may be fixed to the first layer by a double-sided tape or an adhesive, and the first layer may be fixed to the heater layer without using a double-sided tape or an adhesive. Alternatively, the first layer may be fixed to the core portion by a double-sided tape or an adhesive, and the second layer may be fixed by overlapping the first layer without using a double-sided tape or an adhesive. In this manner, it is possible to suppress a decrease in the accuracy of the detection electrode as the first layer, as compared to a manner in which the first layer overlaps the heater layer and the second layer overlaps the first layer.

[0061] (3) For example, the first layer may be fixed to the heater layer by welding or adhesive. Also, for example, the second layer may be fixed to the first layer by welding or adhesive.

[0062] The present invention is not limited to the above-mentioned embodiments, and can be implemented in various structures within the scope of the main purpose. For example, the technical features of the embodiments corresponding to the technical features in each mode recorded in the invention content column can be appropriately replaced or combined in order to solve part or all of the above-mentioned problems or to achieve part or all of the above-mentioned effects. In addition, if the technical feature is not described as an indispensable feature in this specification, it can be appropriately deleted.

[0063] Description of the label

[0064] 1…steering device, 10, 10B…grip portion, 20…rotating portion, 30…detector, 40…control portion, 50, 51, 52, 53, 54…double-sided tape, 60…heater layer, 110…core portion, 111…core, 112…core covering portion, 120…covering portion, 121…first layer, 122…second layer, 123…third layer, AR…rotating axis, AX…axis line, LR…lead wire

Claims

1. A steering device, which is provided on a moving body, wherein: The steering device comprises: a rotating part rotatably mounted on the moving body; as well as a gripping portion connected to the rotating portion and gripped by a passenger, The gripping portion comprises: a core body portion disposed on both sides of the rotating portion; and a covering portion, which covers the core portion and includes a first layer, a second layer, and a third layer, The first layer is arranged at a position close to the core portion relative to the second layer and the third layer and has electrical conductivity. The second layer is disposed between the first layer and the third layer and is formed of a non-conductive but flexible material. The third layer is exposed to the outside of the grip portion and is formed of a non-conductive material. The steering device also has: a detector for detecting a change in capacitance between the first layer and an occupant holding the holding portion; as well as A control unit determines a gripping condition of the gripping unit based on a change in capacitance detected by the detector.

2. The steering device according to claim 1, wherein: The first layer is fixed to the core portion by a double-sided tape or an adhesive, The second layer is fixed to the first layer by a double-sided tape or an adhesive.

3. The steering device according to claim 1, wherein: Furthermore, a heater layer is provided between the core part and the covering part, and the heater layer has electric heating wires. The heating wire is configured to be energizable.

4. The steering device according to claim 3, wherein: The first layer is fixed to the heater layer by a double-sided tape or an adhesive, The second layer is fixed to the first layer by a double-sided tape or an adhesive.

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