JP2017191000A - Rod member moving amount detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately detect the moving amount of a rod member in an axial direction.SOLUTION: A shift rod moving amount detection device 11 is provided with: a displacement sensor 12 that can detect a distance from a member located in a prescribed detection direction; and a detection target unit 14 that has a detection target surface 15 the distance of which from the displacement sensor 12 is to be detected by the displacement sensor 12, and that is provided to a shift rod 13 so as to be movable with the shift rod 13 in an axial direction and positioned within a range including the detection direction of the displacement sensor 12 during the movement of the shift rod 13 within a prescribed range in the axial direction. The detection target surface 15 is configured so as to be equal in distance from the axial center of the shift rod 13 on a cross section on a vertical surface in the axial direction, and to be longer in distance from the axial center O of the shift rod 13 from one end side to the other end side in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rod member movement amount detection device for detecting an amount of movement of an axial direction of a rod member, and in particular, is provided on the rod member, and the distance from the displacement sensor corresponds to the movement of the rod member in the axial direction. The present invention relates to a rod member movement amount detection device including a detection target portion on which a changing detection target surface is formed.

  2. Description of the Related Art Conventionally, in a transmission provided in a vehicle, a shift state or the like is grasped by detecting a position and a movement amount of a shift rod to which a shift fork is attached.

  For example, as a technique for detecting the position of the shift rod, two detection sensors are provided, and a detected portion is provided on the shift rod, and the position of the shift rod is determined based only on the detection result of the detected portion by the two detection sensors. There is known a technique for detecting (for example, Patent Document 1).

  Further, as a device using a technique for detecting the movement amount of the shift rod, a rod member movement amount detection device 51 shown in FIG. 5 is known. The rod member movement amount detection device 51 includes a displacement sensor 52 and a detection target portion 54 provided on the shift rod 53 and having a detection target surface 55 on which a distance is detected by the displacement sensor 52. The detection target surface 55 of the detection target unit 54 is configured by a plane that is inclined so that the distance from the displacement sensor 52 changes in accordance with the movement of the shift rod 53 in the axial direction (AB direction in the figure). For this reason, the movement distance of the shift rod can be detected based on the distance from the detection target surface 55 detected by the displacement sensor 52.

JP 2010-160104 A

  For example, in the rod member movement amount detection device 51 as shown in FIG. 5, the movement amount of the shift rod 53 can be detected by detecting the distance (change in distance) from the displacement sensor 52.

  In such a rod member movement amount detection device 51, the shift rod 53 has a circular outer cross section in a plane perpendicular to the axial direction, and the shift rod 53 may rotate around the axis center. is there.

  When the shift rod 53 rotates around the axis center, the distance between the detection target surface 55 of the detection target portion 54 and the displacement sensor 52 changes. In this case, the distance detected by the displacement sensor 52 includes a change in the distance between the displacement sensor 52 and the detection target surface 55 due to the rotation of the detection target surface 55. For this reason, there is a problem that the axial movement amount of the shift rod 53 detected based on the distance detected by the displacement sensor 52 deviates from the actual movement amount of the shift rod 53.

  Then, an object of this invention is to provide the technique which can detect the moving amount | distance of the axial direction of a rod member appropriately.

  In order to achieve the above-described object, a rod member movement amount detection device according to an aspect of the present invention provides a movement amount in the axial direction of a rod member having a circular cross-section in a plane perpendicular to the axial direction. A rod member movement amount detection device for detecting a rod member, which is provided on the rod member so as to be movable together with the rod member in the axial direction and a sensor capable of detecting a distance from a member in a predetermined detection direction. A detection target portion having a detection target surface that is located in a range including the detection direction of the sensor and is a detection target of a distance between the sensor and the sensor when moving within a predetermined range in the axial direction of The target surface is configured to be equidistant from the axial center of the rod member in a cross section taken along a plane perpendicular to the axial direction, and the axial center of the rod member increases from one end side to the other end side in the axial direction. So that the distance from It is configured.

  In the rod member movement amount detection device, the detection target surface may be formed in a circular shape surrounding the outer periphery of the rod member in a cross section taken along a plane perpendicular to the axial direction.

  Further, in the rod member movement amount detection device, the distance from the axial center of the rod member to the detection target surface is connected to the one end side in the cross section of the detection target surface in the axial direction at one end side in the axial direction. It may be shorter than the radius of the rod member.

  In the rod member movement amount detection device, the detection target surface may be formed in an arc shape in a cross section taken along a plane perpendicular to the axial direction.

  In the rod member movement amount detection device, the detection target unit includes a fixing unit for inserting the rod member into a through hole formed in the inner periphery and fixing the detection target unit to the rod member, and a detection target surface. You may make it comprise the thin-plate-shaped curved surface part to comprise, and the connection part which connects a fixing | fixed part and a curved surface part.

  In the rod member movement detection device, the detection target portion and the rod member may be integrally formed.

  In the rod member movement amount detection device, the sensor is an eddy current type displacement sensor that detects a distance from a member in the detection direction by generating a magnetic flux in the detection direction, and is a detection target of the detection target portion. The member constituting the surface may be a conductor.

  According to the present invention, it is possible to appropriately detect the amount of movement of the rod member in the axial direction.

FIG. 1A is a perspective view of a shift rod movement amount detection device according to the first embodiment of the present invention. FIG. 1B is a side view of a part of the shift rod movement amount detection device according to the first embodiment of the present invention. It is a one part perspective view of the shift rod movement amount detection apparatus which concerns on 2nd Embodiment of this invention. FIG. 3A is a perspective view of a shift rod movement amount detection device according to the third embodiment of the present invention. FIG. 3B is a side view of a part of the shift rod movement amount detection device according to the third embodiment of the present invention. FIG. 4A is a perspective view of a shift rod movement amount detection device according to the fourth embodiment of the present invention. FIG. 4B is a side view of a part of the shift rod movement amount detection device according to the fourth embodiment of the present invention. FIG. 5 is a perspective view of a part of a rod member movement amount detection device according to a conventional example.

  Hereinafter, a shift rod movement amount detection device that is an example of a rod member movement amount detection device according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1A is a perspective view of a shift rod movement amount detection device according to the first embodiment of the present invention, and FIG. 1B is a shift rod movement amount detection device according to the first embodiment of the present invention. FIG. FIG.1 (b) is the side view which looked at the shift rod movement amount detection apparatus from the A direction of Fig.1 (a).

  The shift rod movement amount detection device 11 is a shift direction of the shift rod 13 for moving the transmission mechanism in order to engage / disengage the internal shaft and the transmission gear in a transmission provided in the vehicle (see FIG. This is a device for detecting the amount of movement in 1 (a) AB direction. The shift rod movement amount detection device 11 includes a displacement sensor 12, a shift rod 13 as an example of a rod member, a detection target unit 14, and a control unit 19.

  The shift rod 13 is, for example, a member having a circular outer portion in a cross section perpendicular to the columnar or cylindrical axial direction (the AB direction in FIG. 1A). The shift rod 13 has, for example, a shaft portion with a radius r0. A shift fork (not shown) that is engaged with the outer periphery of a sleeve of a transmission mechanism (not shown) is fixed to the shift rod 13. The shift rod 13 is supported by an unillustrated guide so as to be movable in the axial direction. For example, the guide guides the movement of the shift rod 13 in the axial direction by coming into contact with the entire circumference or a part of the circular portion of the cross section perpendicular to the axial direction of the shift rod 13. The shift rod 13 is moved in the axial direction by, for example, an actuator (not shown).

  The displacement sensor 12 is a sensor that detects a distance and displacement from a member existing in a predetermined detection direction (in this embodiment, the axial direction of the detection sensor 12). For example, the displacement sensor 12 generates a magnetic flux in the detection direction to generate an eddy current in a member in the detection direction, and detects information related to a state caused by the eddy current, thereby It is an eddy current type displacement sensor that detects the distance between them. In the present embodiment, the detection direction of the displacement sensor 12 is adjusted to be vertically downward in a plane perpendicular to the axial direction of the shift rod 13. The detection direction of the displacement sensor 12 is not limited to this direction as long as the distance can be detected using the detection target surface 15 of the detection target unit 14.

  The detection target part 14 is formed in a truncated cone shape by a conductor such as iron or aluminum, for example. The outer surface of the detection target portion 14, that is, the side surface of the truncated cone is a detection target surface 15 from which the distance is detected by the displacement sensor 12. A through hole 18 through which the shift rod 13 is inserted is formed in the detection target portion 14 along the central axis of the detection target portion 14. After the shift rod 13 is inserted into the through hole 18, the detection target portion 14 is fixed to the shift rod 13 so as to be integrally movable in the axial direction by a pin or the like (not shown).

  In a state in which the detection target portion 14 is fixed to the shift rod 13, the detection target surface 15 is a cross section on a plane perpendicular to the axis of the shift rod 13 at the first end portion 16 located at the end on the A direction side. The distance from the axial center O of the shift rod 13 to the detection target surface 15 is a circular shape having the same distance (radius r1: r1> r0). Further, the detection target surface 15 is a distance from the axial center O of the shift rod 13 to the detection target surface 15 in a cross section taken along a plane perpendicular to the axis of the shift rod 13 as it goes from the first end 16 toward the B direction. In the second end portion 17 that is configured to gradually become longer and is positioned at the end on the B direction side, a detection target is detected from the axial center O of the shift rod 13 in a cross section in a plane perpendicular to the axis of the shift rod 13. The distance to the surface 15 is configured to be a circular shape having an equal distance (radius r2: r2> r1). In the detection target portion 14, it is possible to detect the movement distance within the range of the axial distance between the first end portion 16 and the second end portion 17 of the shift rod 13.

  In the present embodiment, as described above, the detection direction of the displacement sensor 12 is aligned vertically downward, and when the shift rod 13 moves in the axial direction, the center of the detection direction of the displacement sensor 12 is It moves on the line ML of 1 (b). At this time, when the shift rod 13 moves in the axial direction, the distance between the displacement sensor 12 and the detection target surface 15 is changed and detected according to the movement.

  The control unit 19 includes a known CPU, ROM, RAM, input port, output port, and the like. The control unit 19 detects the movement distance in the axial direction of the shift rod 13 based on the sensor value from the displacement sensor 12 (the distance from the displacement sensor 12 to the detection target surface 15). For example, the correspondence between the distance from the displacement sensor 112 to the detection target surface 15 and the movement distance from the predetermined reference position in the axial direction of the shift rod 13 is stored in a memory (not shown) of the control unit 19, The unit 19 may specify the moving distance of the corresponding shift rod 13 from the sensor value.

  As described above, the shift rod moving amount detection device 11 according to the first embodiment is a distance from the axial center O of the shift rod 13 to the detection target surface 15 in a cross section taken along a plane perpendicular to the axis of the shift rod 13. Therefore, even if the shift rod 13 and the detection target portion 14 rotate about the axis center O, the distance between the axis center O of the shift rod 13 and the detection target surface 15 does not change. For this reason, the distance between the displacement sensor 12 and the detection target surface 15 in the detection direction of the displacement sensor 12 changes even if rotation about the axial center O of the shift rod 13 and the detection target portion 14 occurs. do not do. For this reason, even if rotation about the shaft center O of the shift rod 13 and the detection target portion 14 occurs, the sensor value output from the displacement sensor 12 does not change, and the amount of movement of the shift rod 13 in the axial direction does not change. Does not affect. Therefore, the shift amount of the shift rod 14 in the axial direction can be appropriately detected without being affected by the rotation about the axis center O of the shift rod 13 and the detection target portion 14.

  Next, a shift rod movement amount detection apparatus according to the second embodiment of the present invention will be described. Here, differences from the first embodiment will be described.

  FIG. 2 is a perspective view of a part of the shift rod movement amount detection device according to the second embodiment of the present invention.

  The shift rod movement amount detection device according to the second embodiment has a shift rod 23. The shift rod 23 includes a first shift rod portion 23A, a detection target portion 24, and a second shift rod portion 23B. The shift rod 23 is integrally formed, for example.

  The first shift rod portion 23 </ b> A is a cylindrical member having a radius r <b> 0 and is connected to the first end portion 26 of the detection target portion 24. The second shift rod portion 23 </ b> B is a cylindrical member having a radius r <b> 0 and is connected to the second end portion 27 of the detection target portion 24.

  The detection target part 24 is formed in a truncated cone shape, for example. The outer surface of the detection target portion 24, that is, the side surface of the truncated cone is a detection target surface 25 from which the distance is detected by the displacement sensor 12.

  The detection target surface 25 of the detection target portion 24 is detected from the axial center O of the shift rod 23 in the cross section of the first end portion 26 located at the end on the A direction side in a plane perpendicular to the axis of the shift rod 23. The distance to the target surface 25 is an equal distance (radius r3: shorter than the radius r0 of the first shift rod portion 23A (r0> r3)). Further, the detection target surface 25 is a distance from the axial center O of the shift rod 23 to the detection target surface 25 in a cross section taken along the plane perpendicular to the axis of the shift rod 23 as it goes from the first end portion 26 toward the B direction. In the second end 27 located at the end on the B direction side, the object to be detected is detected from the axial center O of the shift rod 23 in a cross section perpendicular to the axis of the shift rod 23. The distance to the surface 25 is configured to be a circular shape having an equal distance (radius r4: r4> r3). In the present embodiment, the detection direction of the displacement sensor 12 is aligned so that the center of the detection direction of the displacement sensor 12 is on the detection target surface 25.

  According to the shift rod movement amount detection device according to the second embodiment, the radius r3 of the first end portion 26 of the detection target portion 24 is shorter than the radius r0 of the first shift rod portion 23A. The size can be reduced, or the difference in radius between the first end portion 26 and the second end portion 27 can be increased while suppressing the size of the detection target portion 24. For example, when the difference in radius between the first end portion 26 and the second end portion 27 of the detection target portion 24 is the same as the difference in radius between the first end portion 16 and the second end portion 17 in the first embodiment. The size of the detection target part 24 can be made smaller than the detection target part 14 of the first embodiment. Further, when the size of the maximum diameter portion of the detection target portion 24 is the same as that of the detection target portion 14 of the first embodiment, the difference in radius between the first end portion 26 and the second end portion 27 is set to the first embodiment. The difference in radius between the first end portion 16 and the second end portion 17 can be made larger, and the detection accuracy by the detection sensor 12 can be improved.

  Next, a shift rod movement amount detection device according to a third embodiment of the present invention will be described. Here, differences from the first embodiment will be described.

  FIG. 3A is a perspective view of a shift rod movement amount detection device according to the third embodiment of the present invention. FIG. 3B is a side view of a part of the shift rod movement amount detection device according to the third embodiment of the present invention. FIG.3 (b) is the side view which looked at the shift rod movement amount detection apparatus from the A direction of Fig.3 (a).

  The detection target part 34 is integrally formed of, for example, a conductor such as iron or aluminum. The detection target part 34 includes a fixed part 38, a curved surface part 40, and a connecting part 39. The fixing portion 38 has a through hole through which the shift rod 13 is inserted on the inner periphery. The fixing portion 38 is fixed to the shift rod 13 so as to be integrally movable in the axial direction by a pin or the like (not shown) after the shift rod 13 is inserted into the through hole. The curved surface portion 40 is a thin plate-like member that constitutes the detection target surface 35 whose interval is detected by the displacement sensor 12. The detection target surface 35 corresponds to a part of the side surface of the truncated cone. The connecting portion 39 is a member that connects the fixed portion 38 and the curved surface portion 40.

  In the first end portion 36 located at the end on the A direction side, the detection target surface 35 extends from the axis center O of the shift rod 13 to the detection target surface 35 in a cross section taken along a plane perpendicular to the axis of the shift rod 13. The distance is configured to be an arc with an equal distance (radius r5: r5> r0). In the present embodiment, the arc of the detection target surface 35 is formed so as to include a range on both sides sandwiching a position (position on the line ML) corresponding to the center of the detection direction in the design of the detection sensor 12. Note that the arc formation range may be determined so that even if the shift rod 13 rotates, it is guaranteed that any part of the detection target surface 35 is in the center of the detection direction of the detection sensor 12.

  Further, the detection target surface 35 is a distance from the axial center O of the shift rod 13 to the detection target surface 35 in a cross section taken along a plane perpendicular to the axis of the shift rod 13 as it goes from the first end 36 toward the B direction. In the second end 37 positioned at the end on the B direction side, the object to be detected from the axial center O of the shift rod 13 in the cross section perpendicular to the axis of the shift rod 13 The distance to the surface 35 is configured to be an arc with an equal distance (radius r6: r6> r5). In the present embodiment, the arc of the detection target surface 35 is formed so as to include a range on both sides sandwiching a position (position on the line ML) corresponding to the center of the detection direction in the design of the detection sensor 12. Note that the arc formation range may be determined so that even if the shift rod 13 rotates, it is guaranteed that any part of the detection target surface 35 is in the center of the detection direction of the detection sensor 12.

  In the present embodiment, as described above, the detection direction of the displacement sensor 12 is aligned vertically downward, and when the shift rod 13 moves in the axial direction, the center of the detection direction of the displacement sensor 12 is It moves on the line ML of 3 (b). At this time, when the shift rod 13 moves in the axial direction, the distance between the displacement sensor 12 and the detection target surface 35 is changed and detected according to the movement.

  According to the shift rod moving amount detection device according to the third embodiment, the detection target surface 35 is configured by the thin curved surface portion 40 and the detection target surface 35 is formed in an arc shape, so that the detection target portion 34 is reduced in weight. be able to. In addition, since the detection target surface 35 has an arc shape instead of a circular shape, a necessary area around the shift rod 13 to ensure the movement of the detection target portion 34 can be reduced.

  Next, a shift rod moving amount detection apparatus according to a fourth embodiment of the present invention will be described. Here, differences from the first embodiment will be described.

  FIG. 4A is a perspective view of a shift rod movement amount detection device according to the fourth embodiment of the present invention. FIG. 4B is a side view of a part of the shift rod movement amount detection device according to the fourth embodiment of the present invention. FIG. 4B is a side view of the shift rod movement amount detection device viewed from the direction A in FIG.

  The detection target part 44 is integrally formed of a conductor such as iron or aluminum. The detection target part 44 includes a fixed part 48 and a curved surface part 49. The fixing portion 48 has a through-hole through which the shift rod 13 is inserted on the inner periphery. The fixing portion 48 is fixed to the shift rod 13 so as to be integrally movable in the axial direction by a pin or the like (not shown) after the shift rod 13 is inserted into the through hole. The curved surface portion 49 is a member that constitutes the detection target surface 45 whose interval is detected by the displacement sensor 12. The curved surface portion 49 corresponds to a shape (partial truncated cone) obtained by extracting a portion corresponding to a predetermined central angle with the truncated cone as the axis center.

  The detection target surface 45 has a first end 46 located at the end on the A direction side, and a cross section taken along a plane perpendicular to the axis of the shift rod 13 from the axial center O of the shift rod 13 to the detection target surface 45. The distance is configured to be an arc with an equal distance (radius r5: r5> r0). In the present embodiment, the arc of the detection target surface 45 is formed so as to include a range on both sides sandwiching a position (position on the line ML) corresponding to the center of the detection direction in the design of the detection sensor 12. The arc formation range may be determined so that even if the shift rod 13 rotates, it is guaranteed that any part of the detection target surface 45 is in the center of the detection direction of the detection sensor 12.

  Further, the detection target surface 45 is a distance from the axial center O of the shift rod 13 to the detection target surface 45 in a cross section taken along the plane perpendicular to the axis of the shift rod 13 as it goes from the first end 46 to the B direction side. In the second end 47 located at the end on the B direction side, the object to be detected from the axial center O of the shift rod 13 in the cross section perpendicular to the axis of the shift rod 13 The distance to the surface 45 is configured to be an arc with an equal distance (radius r6: r6> r5). In the present embodiment, the arc of the detection target surface 45 is formed so as to include a range on both sides sandwiching a position (position on the line ML) corresponding to the center of the detection direction in the design of the detection sensor 12. It should be noted that the arc formation range may be determined so as to ensure that any part of the detection target surface 45 is at the center of the detection direction of the detection sensor 12 even if the shift rod 13 rotates.

  In the present embodiment, as described above, the detection direction of the displacement sensor 12 is aligned vertically downward, and when the shift rod 13 moves in the axial direction, the center of the detection direction of the displacement sensor 12 is It moves on the line ML of 4 (b). At this time, when the shift rod 13 moves in the axial direction, the distance between the displacement sensor 12 and the detection target surface 45 is changed and detected according to the movement.

  According to the shift rod movement amount detection device according to the fourth embodiment, the detection target surface 45 is configured by a partial truncated cone, and therefore the weight can be reduced as compared with the case where the detection target unit 45 is configured by a truncated cone. The area required around the shift rod 13 to secure the movement of the detection target portion 44 can be reduced.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, in the above embodiment, the shift rod is used as an example of the rod member. However, the present invention is not limited to this, and the present invention can be applied to any rod member that moves in the axial direction.

  In the above embodiment, an eddy current type displacement sensor is used as an example of the displacement sensor. However, the present invention is not limited to this, and the displacement sensor may be, for example, an object using light (laser). Alternatively, an optical displacement sensor that detects the distance of the object, an ultrasonic displacement sensor that detects the distance to the object using ultrasonic waves, or a contact displacement sensor may be used. The positional relationship between the displacement sensor and the detection target surface may be adjusted according to the detection principle of the displacement sensor. For example, if the displacement sensor is an optical displacement sensor that projects light perpendicular to the detection target surface and receives diffuse reflection light to detect the distance, the light emitted by the displacement sensor is used. What is necessary is just to adjust an axis | shaft so that it may face the axial center O of the shift rod 13. FIG. Moreover, what is necessary is just to determine the member which comprises a detection target surface according to the detection principle of the displacement sensor to be used.

  Further, in the third embodiment, the distance from the axial center O of the shift rod 13 to the detection target surface 35 is an equidistant arc shape in the cross section of the detection target surface 35 in a plane perpendicular to the axial direction. However, the present invention is not limited to this, and the cross section in a plane perpendicular to the axial direction may be circular. If it does in this way, compared with the case where a detection target part is formed in truncated cone shape like 1st Embodiment, a detection target part can be reduced in weight.

  In the first, third, and fourth embodiments, the shift rod and the detection target part are formed separately and then fixed. However, the present invention is not limited to this, and the shift is performed. The rod and the detection target part may be integrally formed.

DESCRIPTION OF SYMBOLS 11 Shift rod moving amount detection apparatus 12 Displacement sensor 13, 23 Shift rod 14, 24, 34, 44 Detection target part 15, 25, 35, 45 Detection target surface 16, 26, 36, 46 1st edge part 17, 27, 37, 47 Second end portion 19 Control unit 38, 48 Fixing portion 39 Connecting portion 40, 49 Curved portion

Claims (7)

A rod member movement amount detection device for detecting the amount of movement in the axial direction of a rod member having a circular outer portion of a cross section in a plane perpendicular to the axial direction,
A sensor capable of detecting a distance between a member in a predetermined detection direction;
It is provided in the rod member so as to be movable together with the rod member in the axial direction, and is located in a range including the detection direction of the sensor when the rod member moves within a predetermined range in the axial direction. A detection target portion having a detection target surface that is a detection target of the distance between the sensor, and
The detection target surface is configured to be equidistant from the axial center of the rod member in a cross section in a plane perpendicular to the axial direction, and as it goes from one end side to the other end side in the axial direction, A rod member movement amount detection device configured to increase a distance from an axial center of the rod member. 2. The rod member movement amount detection device according to claim 1, wherein the detection target surface is formed in a circular shape surrounding an outer periphery of the rod member in a cross section taken along a plane perpendicular to the axial direction. The rod connected to the one end side by a distance from the axial center of the rod member to the detection target surface in a cross section of a plane perpendicular to the axial direction on one end side in the axial direction of the detection target surface The rod member movement amount detection device according to claim 2, which is shorter than a radius of the member. The rod member movement amount detection device according to claim 1, wherein the detection target surface is formed in an arc shape in a cross section taken along a plane perpendicular to the axial direction. The detection target portion includes a fixing portion for fixing the detection target portion to the rod member by inserting the rod member through a through hole formed in an inner periphery, and a thin plate-like curved surface constituting the detection target surface The rod member movement amount detection device according to any one of claims 1 to 4, further comprising a connecting portion that connects the fixing portion and the curved portion. The rod member movement amount detection device according to any one of claims 1 to 5, wherein the detection target portion and the rod member are integrally formed. The sensor is an eddy current type displacement sensor that detects a distance from a member in the detection direction by generating a magnetic flux in the detection direction;
The rod member movement amount detection device according to any one of claims 1 to 6, wherein a member constituting the detection target surface of the detection target portion is a conductor.

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