JP5332640B2 - Steering force detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve measurement accuracy by stabilizing the attachment state of a sensor part to a steering wheel. <P>SOLUTION: A sensor body 17 is attached to a steering wheel 1, and an input grip 43, which an operator holds to input a rotation steering force to the steering wheel 1, is attached to the outer circumference of the sensor body 17. The sensor body 17 includes strain-generating parts 57, 59 generating a strain in response to transmission of the steering force input to the input grip 43 and detects the steering force of the steering wheel 1, based on the strain of the strain generating parts 57, 59. The sensor body is substantially U-shaped, and a connecting arm 25 is attached on the opening side of the sensor body 17. By having a screw member 25, attached on the connecting arm 25 screwed such that the tip of the screw member 25, the tips of a plurality of pressing pins 37 provided on a curved part 19 of the sensor body 17 are pressed against and are fixed on the steering wheel 1. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a steering force detection device that detects a steering force when a steering wheel is rotated.

  As a device for detecting the rotational operation force of the steering wheel, there is known a device in which a strain generating portion serving as a sensor portion that generates distortion during the rotational operation of the steering wheel is attached to the steering wheel via an internal sleeve and an external sleeve. (See Patent Document 1 below).

  Each of the inner sleeve and the outer sleeve has a cylindrical shape formed by combining a pair of semi-cylindrical members, and is attached so as to sandwich the steering wheel. At that time, the strain generating portion has one end fixed between the ends of the pair of semi-cylindrical members of the inner sleeve and the other end fixed between the ends of the pair of semi-cylindrical members of the outer sleeve. Yes. In this state, the operator grasps the external sleeve and rotates the steering wheel, whereby the operating force at that time is transmitted to the strain generating portion.

JP 2008-164421 A

  By the way, in the above-described conventional apparatus, when the sensor portion (strain generating portion) is attached to the steering wheel, an internal sleeve that is formed into a cylindrical shape by combining a pair of semi-cylindrical members is attached so as to be wound around the steering hole. is there. For this reason, when an operating force is input from the outer sleeve to the inner sleeve through the strain generating portion, there is a risk of slipping between the inner surface of the inner sleeve and the outer surface of the steering wheel, and the mounting state is unstable. Therefore, the measurement accuracy is insufficient.

  Therefore, an object of the present invention is to stabilize the attachment state of the sensor portion to the steering wheel and increase the measurement accuracy.

In the present invention, a sensor main body including a strain generating portion that generates distortion due to transmission of an operation force from an input member is attached so as to cover a part of the outer peripheral portion along the rotation direction when the steering wheel is operated. The sensor body is fixed to the at least three locations along the circumferential direction of the outer periphery by using a fixing means so as to sandwich the steering wheel, and the sensor body covers the outside as viewed from the rotation center of the steering wheel. Provided with a bending portion, provided with a pair of connecting portions respectively extending from both ends of the bending portion toward the rotation center portion of the steering wheel, wherein one of the plurality of fixing means includes a connecting arm, The connecting arm has one end rotatably connected to one of the pair of connecting portions and the other end connected to the other of the pair of connecting portions. Linking fixed by coupling Te, wherein the connecting surface of the other end of the connecting arm, a connecting surface of the connecting portion of the other being connected to the connecting surface of the end portion of said other is, one of the connecting arm It is formed in the circular arc surface centering on the rotation center in an edge part, These each connection surface is characterized by the close_contact | adherence .

According to the present invention, since the attachment state of the sensor body to the steering wheel is stabilized, it is possible to improve the measurement accuracy of the steering force when the operator grasps the input member and rotates the steering wheel.
Further, the sensor body can be easily and reliably fixed to the steering wheel by the connecting arm in a state where the sensor body is mounted so as to cover the steering wheel.
Further, by rotating the connecting arm with respect to one connecting portion around one end, the other end is connected to the other connecting portion, and the other end is the other connecting portion. It is possible to displace to a non-connected state separated from.

FIG. 3 is an enlarged AA sectional view of FIG. 2 showing the first embodiment of the present invention. It is a front view of the steering wheel which attached the sensor block of FIG. It is the top view seen from the upper direction of Drawing 1 of a sensor main part. FIG. 5 is a correlation diagram between an operation force and an operation angle of a steering wheel. FIG. 4A is a cross-sectional view corresponding to FIG. 1 and FIG. 3B is a plan view corresponding to FIG. 3 according to a second embodiment of the present invention. FIG. 4 is a front view of a steering wheel corresponding to FIG. 2 and (b) is a cross-sectional view corresponding to FIG. 1 according to a third embodiment of the present invention. It is a control block diagram of the example which provided the gyro sensor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an enlarged AA sectional view of FIG. 2 showing the first embodiment of the present invention. As shown in FIG. 2, the ring-shaped rim portion 3 of the steering wheel 1 has two circumferential directions. Sensor blocks 5 and 7 are attached. Each of the sensor blocks 5 and 7 is located at a position substantially corresponding to a portion where the driver as an operator holds the steering wheel 1 with both hands when the vehicle including the steering wheel 1 is driven, that is, the boss at the center of the steering wheel 1. It is attached in the vicinity of the spoke portions 11 and 13 extending from the portion 9 to the left and right.

The steering wheel 1 includes a spoke portion 15 that extends downward in addition to the above-described spoke portions 11 and 13 that extend to the left and right, and a steering shaft (not shown) that extends from the boss portion 9 toward the rear side of the drawing in FIG. It is attached so that it can rotate.
Since the sensor blocks 5 and 7 described above have the same basic configuration, the sensor block 5 in FIG. 1 shown as a cross-sectional view along the line AA in FIG. 2 will be mainly described below.

  As shown in FIG. 1, the sensor block 5 includes a sensor body 17 having a substantially U-shaped cross section. The sensor main body 17 is made of, for example, aluminum, and is steered in a state of being substantially parallel to each other from a curved portion 19 having a circular arc cross section covering almost half of the outer periphery of the rim portion 3 and from both upper and lower ends in FIG. The wheel 1 includes a pair of connecting portions 21 and 23 extending toward the rotation center portion located on the right side in FIG.

  That is, the sensor body 17 described above has a substantially U-shaped cross section including a curved portion 19 that covers the outer side when viewed from the rotation center portion of the steering wheel 1, and the rotation center portion of the steering wheel 1 extends from both ends of the curve portion 19. Thus, a pair of connecting portions 21 and 23 extending toward each other is provided.

  Here, one connecting portion 21 located in the upper part in FIG. 1 is located on the surface side on the operator side in a state where the operator grasps the steering wheel 1 (sensor blocks 5 and 7). The connection part 21 is formed longer than the connection part 23 located in the back side. The connecting portions 21 and 23 are connected to each other by a connecting arm 25.

  The connecting arm 25 is formed so that the width in the direction orthogonal to the paper surface in FIG. The connecting arm 25 is connected so that one end of the lower part in FIG. 1 is rotatably connected to the connecting part 23 via a connecting pin 27 and the other end of the upper part is inserted from the bolt insertion hole 21 a of the connecting part 21. The bolt 29 is fastened and fixed to the screw hole 25a.

  In the connected state of FIG. 1, the connecting surface 21b of the connecting portion 21 is a gently concave curved surface, while the connecting surface 25b of the connecting arm 25 is a gently convex curved surface, and the connecting surfaces 21b and 25b are in close contact with each other. It is in a state of being. Each of the connecting surfaces 21b and 25b forms a circular arc surface centering on the rotation center of the connecting pin 27. Therefore, by rotating the connecting arm 25 about the connecting pin 27, the connection state of FIG. The connecting surface 25b of the connecting arm 25 can be displaced to an unconnected state separated from the connecting surface 21b of the connecting portion 21.

  Further, a spring accommodating hole 25c for accommodating the spring 31 is provided on the connecting surface 25b of the connecting arm 25 on the back side (left side in FIG. 1) from the screw hole 25a. One end of the spring 31 is fixed to the bottom of the spring accommodating hole 25c, a steel ball 33 is attached to the other end, and a part of the steel ball 33 is provided on the connecting surface 21b side of the connecting portion 25. I'm getting in. By pressing the steel ball 33 into the recess 21 c with the spring 31 and entering, the connecting arm 25 is temporarily fixed to the connecting portion 21 in a state before the connecting bolt 29 is fastened.

  A screw hole 25d penetrating from the outside toward the rim portion 3 of the steering wheel 1 is formed at a substantially central portion in the longitudinal direction (vertical direction in FIG. 1) of the connecting arm 25, and a pin member is formed in the screw hole 25d. The screw member 35 is screwed in. The screw member 35 is formed with a screw portion 35a on the outer periphery over its entire length, is provided with a pressing portion 37 that presses against the rim portion 3 at the tip, and a tool insertion hole for inserting and rotating a tool (not shown) on the base end side. 35b is provided. In addition, the pressing direction by the screw member 35 described above is directed to the center P of the cross-sectional shape shown in FIG.

  Further, the bending portion 19 of the sensor main body 17 located on the opposite side of the rim portion 3 with respect to the screw member 35 described above is provided as a pin member at a position shifted vertically from the center P of the rim portion 3 in FIG. The pressing pin 37 is attached. As shown in FIG. 1, a pair of upper and lower pressing pins 37 are provided in a direction perpendicular to the front and back sides of the paper surface in FIG. 1 with respect to the screw member 35 (more precisely, a direction along the curved shape of the rim 3). 4) are provided in total. That is, a plurality of the pressing pins 37 are provided along the rotation direction when the steering wheel 1 is operated.

  Instead of providing a plurality of the pressing pins 37 along the rotation direction when the steering wheel 1 is operated, a long pressing member may be provided along the rotation direction. Therefore, in this case, the sensor body 17 is attached so as to cover a part of the outer peripheral portion along the rotational direction when the steering wheel 1 is operated, and the circumferential direction of the attached outer peripheral portion (the rim portion 3 in FIG. 1). The steering wheel 1 is fixed to at least three locations along the circumferential direction of the cross section of the steering wheel 1 by using the two pressing members and the one screw member 35.

  Each of the pressing pins 37 is inserted and fixed in the fixing hole 19a formed in the curved portion 19 with the shaft portion 37a, and one end portion of the shaft portion 37a protrudes toward the rim portion 3 and is pressed against the protruding end portion. A portion 37b is formed. The pressing portion 37 b has a tip with a convex curved surface, and presses the convex curved surface against the rim portion 3. The pressing direction by the pressing pin 37 is directed to a point Q between the center P of the rim portion 3 and a portion pressed by the screw member 35 on the outer periphery of the rim portion 3.

  Therefore, the sensor main body 17 has a rim of the steering wheel 1 by a total of five points: one screw member 35 provided on the connecting arm 25 and four pressing pins 37 provided on the curved portion 19 of the sensor main body 17. The outer peripheral part of the part 3 is fixed by pressing. In this fixed state, gaps 39 and 41 are formed between the outer periphery of the rim portion 3 and the sensor body 17 and the connecting arm 25.

  The connecting arm 25, the screw member 35, and the pressing pin 37 constitute a fixing means. Therefore, one of the plurality of fixing means includes the connecting arm 25 that is connected to the connecting portions 21 and 23 of the sensor body 17 so as to be detachable.

  FIG. 3 is a plan view of the sensor main body 17 as viewed from above in FIG. 1, and a screw hole 21d for attaching the input grip 43 shown in FIG. Similarly, a screw hole 23a for attaching the input grip 43 is also provided in the lower connecting portion 23 in FIG. These screw holes 21d and 23a are located on the upper and lower sides of the center P of the rim portion 3 in FIG. 1, and the centers of the screw holes 21d and 23a and the center P are located on the same straight line. In FIG. 3, the input grip 43 is indicated by a virtual line (two-dot chain line).

  The input grip 43 constitutes an input member that is gripped by an operator and inputs a rotational operation force with respect to the steering wheel 1 and is made of, for example, a resin. The sensor body 17 has substantially the same shape so as to substantially cover it. That is, the input grip 43 covers the curved portion 45 having a circular arc shape in a state of being substantially in contact with the outer peripheral surface of the curved portion 19 and the outside of the connecting portions 21 and 31 from the upper and lower ends of the curved portion 45 in FIG. The plane fixing portions 47 and 49 extending in parallel with each other are provided and have a substantially U-shaped cross section. The curved surface 45 of the input grip 43 is provided with a slit 45a along the curved surface shape.

  Then, fixing bolts 51 and 53 are respectively inserted into bolt insertion holes 47a and 49a provided in the plane fixing portions 47 and 49 of the input grip 43, and the fixing bolts 51 and 53 are connected to the connecting portions 21 and 32, respectively. The input grip 43 is fixed to the sensor body 17 by fastening to the screw holes 21d and 23a, respectively.

  Here, the lower plane fixing portion 49 in FIG. 1 covers almost the entire connecting portion 23 of the sensor body 17, but the upper plane fixing portion 47 is a bolt insertion hole 21 a for connecting the connecting arm 25. It is located in the curved part 19 side rather than, and it is set as the shape which covers substantially half of the connection part 21. FIG.

  A part of the connecting portion 21 of the sensor body 17 at a portion facing the flat surface fixing portion 47 of the input grip 43 is slightly thin by forming a notch surface 21e outside the circular boss portion 21f around the screw hole 21d. A gap (not shown) is formed between the notch surface 21e and the flat surface fixing portion 47. The boss portion 21 f is a portion that contacts the flat surface fixing portion 47. A pair of strain-generating portions 57 and 59 are formed in one portion of the thin portion of the notch surface 21e corresponding to the gap (not shown) as shown in FIG.

  The strain generating portions 57 and 59 generate distortion by transmitting the operating force input to the input blip 43, and are located on both the upper and lower sides of the boss portion 21f in FIG. 3, and the rim portion in FIG. 3 is located above the center P. That is, the centers of the strain generating portions 57 and 59 are located on a straight line extending in the vertical direction passing through the center P in FIG.

  Such strain generating portions 57 and 59 are similarly provided on the lower plane fixing portion 49 side in FIG. 1, and the centers of these upper and lower strain generating portions 57 and 59 are the center P in FIG. It is located on a straight line that passes in the up-down direction.

  The upper and lower strain generating portions 57 and 59 correspond to a connecting portion that connects the movable portion 61 including the thin portion and the boss portion 21f formed with the notch surface 21e and the fixed portion 63 outside the movable portion 61 to each other. That is, the movable portion 61 is integrated with the fixed portion 63 via the strain generating portions 57 and 59, and the outer peripheral edge of the movable portion 61 is made with respect to the inner peripheral edge of the fixed portion 63 by the peripheral notch openings 65 and 67. It is separated.

  The notch opening 65 is formed in a portion corresponding to almost half of the periphery of the boss portion 21f, and the elongated hole openings 65a and 65b adjacent to the strain-generating portions 57 and 59, and the elongated hole openings 65a, 65a, An arc-shaped slit opening 65c is provided to allow the 65b to continue on the bolt insertion hole 21a side.

  On the other hand, the notch opening 67 has one end at the elongated hole openings 67a and 67b and the elongated hole openings 67a and 67b which are located on the opposite side of the elongated hole openings 65a and 65b with respect to the strain generating portions 57 and 59. Are provided with linear slit openings 67c and 67d. In the slit openings 67c and 67d, the ones provided in the upper and lower connecting portions 21 and 23 in FIG. 1 are continuously located in the same straight line in the plan view of FIG.

  Further, a large semicircular opening 67e is formed on the opposite side of the slit opening 65c with the boss 21f in the movable portion 61 as a boundary. What was provided in 21 and 23 is mutually continuous.

  A strain gauge 69 is attached to the outer surface of the strain generating portions 57 and 59 near the fixed portion 63, for example. The strain gauge 69 constitutes a strain detector that detects the strain of the strain generating portions 57 and 59. The output of the strain gauge 69 is connected to a bridge circuit (not shown) wired at an appropriate position of the sensor body 17, and the output from the bridge circuit is passed through an output cable 71 as a signal line as shown in FIG. The amplifier 73 takes in. The amplifier 73 includes a steering force calculator that receives the output signal of the strain gauge 69 and calculates the steering force (torque) of the steering wheel 1 and is detachably attached to the steering column on the vehicle body side.

  The output cable 71 is set to a length that can be followed when the steering hole 1 is rotated by a necessary amount (angle) when the steering force is measured. The connector 75 is provided with a ferromagnetic portion on the sensor body 17 side and is detachably attached by a magnet 77.

  The same applies to the above-described output cable 71 and connector 75 for the other sensor blocks 7 shown in FIG.

  Next, the operation will be described. The operator grasps only the input grip 43 by wrapping the sensor block 5 with the left hand and the sensor block 7 with the right hand. At this time, the thumb is placed on the plane fixing part 47 of the input grip 43, and other fingers such as other index fingers are put on the plane fixing part 49 on the opposite side.

  In this state, when the operator rotates the steering wheel 1 in either the left or right direction, this rotational operation force is transmitted to the sensor via the fixing bolts 51 and 53 that are the connection portions from the input grip 43 to the sensor body 17. It is transmitted to the movable portion 61 of the main body 17 and further transmitted to the fixed portion 63 of the sensor main body 17 through the strain generating portions 57 and 59.

  The rotational operation force transmitted to the fixing portion 63 is transmitted to the rim portion 3 of the steering wheel 1 through the connecting arm 25, the screw member 35 and the pressing pin 37, which are fixing means, whereby the steering wheel 1 rotates.

  In the process in which the rotational operation force is transmitted, the strain generating portions 57 and 59 are distorted. This strain is detected by the strain gauge 69, and the detection signal of the strain gauge 69 passes through the output cable 71 from the bridge circuit. The steering force (torque) is calculated by being input to the amplifier 73. The calculated steering force data is captured by the control device 79 shown in FIG. 7 to be described later. For example, as shown in FIG. 4, the operation force varies depending on the relationship between the operation (rudder) force (N) and the operation angle (°). After determining whether it is within the allowable range of the minute ΔF, the data is output by displaying it.

  In addition, what is necessary is just to utilize the gyro sensor 81 (FIG. 5) mentioned later about the measurement of the operation angle (rotation angle) of the steering wheel 1. FIG.

  When the steering wheel 1 needs to be rotated greatly, an amplifier 73 is attached to, for example, the boss portion 9 on the rotating steering wheel 1 side, a transmitter is mounted on the amplifier 73, and a receiving function is provided on the vehicle body side. The provided control device 79 is arranged.

  According to the present embodiment, the sensor body 17 is arranged so as to cover a part of the outer peripheral portion along the rotational direction when the steering wheel 1 is operated, and the four pressing pins 37 and the one screw member 35 are disposed. Thus, the rim 3 of the steering wheel 1 is fixed so as to be clamped, so that the attachment state of the sensor body 17 to the rim 3 can be stabilized. Thereby, when the operator grasps the input grip 43 and rotates the steering wheel 1, it is possible to suppress the displacement of the sensor body 17 with respect to the steering wheel 1 and increase the measurement accuracy of the steering force.

  At this time, in the present embodiment, since the sensor body 17 is measured in a state where it is attached to the steering wheel 1 that is actually used when the vehicle is driven, without using the steering wheel exclusively for measurement by removing the steering wheel 1, The steering force can be measured easily and accurately.

  Further, when the steering wheel 1 is rotated at the time of measuring the steering force, the input grip 43 covering the strain generating portions 57 and 59 is gripped, so that the operator's finger touches the strain generating portions 57 and 59. Accurate measurement is possible without any problems.

  In the present embodiment, since a plurality of pressing pins 37 are provided along the rotation direction when the steering wheel 1 is operated, the attachment state of the sensor body 17 to the rim portion 3 can be further stabilized.

  Further, in the present embodiment, the sensor body 17 has a substantially U-shaped cross section including a curved portion 19 that covers the outside as viewed from the rotational center portion of the steering wheel 1, and the steering wheel 1 rotates from both ends of the curved portion 19. A pair of connecting portions 21 and 23 extending respectively toward the central portion is provided, and a connecting arm 25 is provided for connecting to the connecting portions 21 and 23 so as to be detachable, and serves as a fixing means. For this reason, the sensor main body 17 can be easily and reliably fixed to the rim portion 3 by the connecting arm 25 in a state where the sensor main body 17 is mounted so as to cover the rim portion 3 of the steering wheel 1.

  Further, by screwing the screw member 35, which is a pin member, into the connecting arm 25, the rim portion 3 of the steering wheel 1 can be fixed by being sandwiched between the screw member 35 and the pressing pin 37.

  In this embodiment, the output cable 71 connects the amplifier 73 and the strain gauge 69, which receive the output signal of the strain gauge 69 that detects the strain of the strain generating portions 57 and 59, and calculates the steering force of the steering wheel 1. A connector 75 on the strain gauge 69 side of the output cable 71 is detachably attached to the sensor body 17 via a magnet 77.

  For this reason, for example, when the steering wheel 1 is suddenly rotated or greatly rotated, the attracted state of the magnet 77 is removed and the connector 75 is detached from the sensor body 17, and the output cable 71 is disconnected. Damage can be suppressed.

  FIG. 5 shows a second embodiment of the present invention. In this embodiment, a gyro sensor 81 is attached to the tip of the connecting portion 21 of the sensor body 17 to measure the angle (steering angle) of one rotation of the steering wheel. The rotation angle measured by the gyro sensor 81 is obtained by adding the angle at which the vehicle turns by this rotation to the angle at which the steering wheel 1 is rotated.

  For this reason, another gyro sensor 83 (see FIG. 7) is installed in the amplifier 73 in the first embodiment, for example, on the vehicle body side, and the gyro sensor 83 on the vehicle body side uses the rotation angle measured by the gyro sensor 81. By subtracting the measured rotation angle, the rotation angle (absolute steering angle) of the steering wheel 1 can be accurately measured.

  Note that the vehicle-side gyro sensor 83 can be installed at a position closer to the steering column as in the amplifier 73 provided on the vehicle body side, or a plurality of gyro sensors 83 can measure the vehicle turning more accurately. .

  By measuring the rotation angle of the steering wheel 1 by the gyro sensor 81, not only the steering force but also the steering angle can be easily and accurately measured without removing the steering wheel 1.

  FIG. 6 shows a third embodiment of the present invention. In this embodiment, with respect to the first embodiment shown in FIG. 2, an operation knob 85 is attached to one of the two sensor blocks 5, 7, for example, the sensor block 7. The operator grasps the operation knob 85 and rotates the steering wheel 1 to measure the steering force and the steering angle.

  In this embodiment, since the steering wheel 1 is rotated by grasping the operation knob 85, the operability particularly when the steering wheel 1 is largely rotated is improved.

  FIG. 7 is a control block diagram of an example in which the gyro sensors 81 and 83 are provided. Each data measured by the strain gauge 69 and the gyro sensors 81 and 83 is transmitted to the control device 79 through the amplifier 73 by wire or wireless. Thus, the steering force and the steering angle are calculated.

  Therefore, the control device 79 includes a steering force calculation unit that calculates the steering force of the steering wheel 1 and also includes a steering angle calculation unit that detects the absolute steering angle of the steering wheel 1.

  In each of the above-described embodiments, the two sensor blocks 5 and 7 are provided. However, any one of the sensor blocks 5 and 7 may be provided.

DESCRIPTION OF SYMBOLS 1 Steering wheel 17 Sensor main body 19 Bending part of sensor main body 21, 23 Connecting part of sensor main body 25 Connecting arm (fixing means)
35 Screw member (pin member, fixing means)
37 Pressing pin (pin member, fixing means)
43 Input grip (input member)
57, 59 Strain generation part of sensor body 69 Strain gauge (strain detection part)
71 Output cable (signal line)
75 Connector (connection part)
77 Magnet 79 Control device (steering force calculation unit, steering angle calculation unit)
81,83 Gyro sensor

Claims (5)

A sensor main body is attached to the outer peripheral portion of the steering wheel, and an input member that is gripped by an operator and inputs a rotational operation force to the steering wheel is attached to the outer peripheral side of the sensor main body, and the sensor main body is input to the input member. A steering force detecting device for detecting a steering force of a steering wheel based on the distortion of the strain generating portion, wherein
The sensor body is attached so as to cover a part of the outer peripheral part along the rotational direction when the steering wheel is operated, and the fixing means is used for at least three places along the circumferential direction of the attached outer peripheral part. Fix the sensor body so as to sandwich the steering wheel,
The sensor body includes a curved portion that covers an outer side when viewed from the rotation center portion of the steering wheel, and includes a pair of connecting portions that extend from both ends of the bending portion toward the rotation center portion of the steering wheel. One of the plurality of fixing means comprises a connecting arm;
The connecting arm has one end portion rotatably connected to one of the pair of connecting portions, and the other end portion connected to the other of the pair of connecting portions by a connector. Fixed ,
The connection surface of the other end of the connection arm and the connection surface of the other connection connected to the connection surface of the other end are centered on the rotation center at the one end of the connection arm. A steering force detecting device formed on an arcuate surface, wherein the connecting surfaces are in close contact with each other .   The fixing means includes a pin member that is fixed in a state of being pressed against an outer peripheral portion of the steering wheel, and a plurality of the pin members are provided along a rotation direction when the steering wheel is operated. Item 2. The steering force detection device according to Item 1.   The steering force detection device according to claim 2, wherein the pin member provided on the connection arm is a screw member.   A strain detection unit that detects a strain of the strain generation unit is provided in the vicinity of the strain generation unit, a steering force calculation unit that receives an output signal of the strain detection unit and calculates a steering force of the steering wheel, and the distortion detection unit 4. The signal line is connected to each other by a signal line, and the connection part of the signal line on the strain detection part side is detachably attached to the sensor body via a magnet. The steering force detection device according to item.   The sensor body is provided with a gyro sensor for detecting the steering angle of the steering wheel, and the vehicle body side is provided with a gyro sensor for detecting the turning angle of the vehicle. Based on the output signal of each gyro sensor, the absolute value of the steering wheel is determined. The steering force detection device according to any one of claims 1 to 4, further comprising a steering angle calculation unit that detects a steering angle.

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