JP5269710B2 - Movement detector - Google Patents

Description

  The present invention relates to a movement detection device used to detect the opening / closing amount of a valve provided in an exhaust gas recirculation device of an internal combustion engine and the movement amount of various device mechanisms, and in particular, a magnet is mounted on a moving part. The present invention relates to a movement detection device in which a magnetic detector for detecting a leakage magnetic field from the magnet is provided in a fixed portion.

  In various devices, a movement detection device including a magnet and a magnetic detector that detects a leakage magnetic field from the magnet is used to detect the movement state of the moving unit. As an example, Patent Document 1 below discloses an opening degree detection device that detects an opening / closing amount of a variable valve provided in a carburetor of an internal combustion engine using a magnetic sensor.

  In this opening degree detection device, a holder provided in a valve chamber reciprocates together with a piston valve which is a moving part. A plastic magnet is fixed to the holder, and the plastic magnet moves in the valve chamber as the piston valve and the holder move. A sensor chamber is integrally formed outside the valve chamber, and three magnetic sensors are provided in the sensor chamber side by side in the moving direction of the plastic magnet. In this opening degree detection device, three magnetic sensors detect the movement position of the plastic magnet, thereby detecting that the piston valve has reached the first opening degree, the second opening degree, or the third opening degree. Is.

JP 7-317574 A

  However, as in the invention described in Patent Document 1, in the form in which one is the moving part and the other is the fixed part and the holder that holds the magnet is moved together with the moving part, a strong impact is applied to the moving part. Sometimes a strong impact is also applied to the holder side.

  As a result, the part which fixedly supports between the holder and the moving part (piston valve) was damaged, resulting in a problem that the holder was detached from the moving part.

  Accordingly, the present invention solves the above-described conventional problems, and in particular, an object of the present invention is to provide a movement detection device that is superior in detection accuracy and impact resistance as compared with the conventional one.

The movement detection apparatus in the present invention is
A moving unit; a magnet that moves together with the moving unit; a magnetic detector that is installed in the fixed unit and detects a leakage magnetic field from the magnet; and a guide surface that holds the magnet and is provided in the fixed unit A sliding holder that slides between the moving part and the sliding holder, and presses the sliding holder in the guide surface direction and faces the sliding holder in the sliding direction. And a connecting member having a holding portion that is held from the surface.

  In the present invention, since the sliding holder moves while being pressed in the guide surface direction by the connecting member, the opposing distance between the magnetic detector and the magnet can be set with high accuracy, and excellent detection accuracy can be obtained. By holding both side surfaces facing the sliding direction of the sliding holder by the holding part provided on the member, even if a strong impact is applied to the moving direction of the moving part, the sliding holder is detached from the connecting member. It is possible to prevent and improve the impact resistance.

  In the present invention, it is preferable that the sliding holder is pressed and held by the elastic force of the holding portion. The impact can be easily absorbed by the holding portion, and the impact resistance can be improved more effectively.

In the above, it is preferable that the connecting member is a leaf spring, and each holding portion has a portion bent toward each side surface direction of the sliding holder facing each holding portion. In particular, it is preferable that the holding portion has a shape in which an end portion of the leaf spring is folded inward. Thereby, the strength and springiness of the holding portion can be improved with a simple structure.
Alternatively, in the present invention, the sliding holder may be held by the holding portion.

In the present invention, the connecting member is a leaf spring, and the leaf spring includes a mounting piece fixed to the moving portion, and the first bending portion is folded back from the mounting piece to move the moving portion. An intermediate piece extending in a direction, and a pressing piece that is folded back from the intermediate piece at a second bent portion and extends in a direction opposite to the intermediate piece,
It is preferable that the holding portion is provided integrally with the pressing piece, and the sliding holder is held in a space formed between the pressing piece and each holding portion.

  When the leaf spring having the above structure is used, the sliding holder is pressed against the guiding surface with a load with little bias both when the sliding holder slides in one direction on the guiding surface and in the other direction. In addition, when the sliding holder slides in both directions on the guide surface, it is possible to ensure adhesion with the guide surface, and it is difficult for rattling to occur during movement.

  When the leaf spring having the above structure is used, the leaf spring is not easily elastically deformed by the force acting in the moving direction when the moving portion is moving, and the moving portion is slid with the moving portion during the movement of the moving portion. It is possible to suppress a displacement in the movement direction between the moving holder and the detection accuracy can be improved. On the other hand, the leaf spring in the present invention is not easily elastically deformed in the moving direction even when a strong impact is applied in the moving direction of the moving part. Therefore, in the conventional structure without the holding part of the present invention, the connecting member is interposed. A strong impact is likely to be applied to the sliding holder side, and a portion where the sliding holder and the connecting member are fixed is damaged, and the sliding holder is likely to be detached from the connecting member. On the other hand, in the present invention, since the holding portions are provided on both sides of the connecting member (plate spring) in the moving direction of the pressing piece, the plate spring having the above-described structure is used, and the moving portion has a strong impact in the moving direction. Even if it is added, it is easy to absorb the impact in the holding portion, and therefore the sliding holder can be hardly detached from the connecting member, and the impact resistance can be improved.

  In the present invention, the sliding holder is provided with a support portion that is spaced from the moving portion in the moving direction, and the elastic pressing force from the pressing piece acts on the support portion. Is preferred.

  Further, in the present invention, the attachment piece is provided with a holding piece that is spaced apart in the moving direction of the moving part, and a part of the moving part is the holding piece from both sides in the moving direction. It is preferable to be sandwiched. By providing the clamping piece on the mounting piece, it is possible to prevent the leaf spring itself from rattling in the moving direction with respect to the moving part.

  Moreover, in this invention, it is preferable that the auxiliary | assistant press piece which presses the said magnet directly and positions the said magnet to the said sliding holder is integrally provided in the said press piece. In the above invention, the slide holder can be pressed against the guide surface by the pressing piece of the leaf spring, and the magnet is pressed against the sliding holder by the auxiliary pressing piece, thereby stabilizing the positioning of the magnet and the sliding holder. I can do it.

  Further, in the present invention, a shaft portion is provided integrally with the moving portion, and the shaft portion has a structure protruding outward from the housing which is the fixed portion, and even if a strong impact is applied from the shaft portion, Accordingly, the impact resistance can be effectively improved.

  According to the movement detection device of the present invention, both detection accuracy and impact resistance can be improved as compared with the conventional case.

Sectional drawing which shows the movement detection apparatus of this Embodiment, The perspective view of the connection member (leaf spring) of this embodiment, An exploded perspective view showing the sliding holder, the magnet and the connecting member from the back side, Sectional view of sliding holder and connecting member, The longitudinal cross-sectional view which shows the modification of the holding part which comprises a connection member.

  FIG. 1 is a cross-sectional view showing a movement detection device of this embodiment. FIG. 2 is a perspective view of the connecting member (leaf spring) of the present embodiment. FIG. 3 is an exploded perspective view of the connecting member, the magnet, and the sliding holder as seen from the back side. FIG. 4 is a longitudinal sectional view showing the connecting member and the sliding holder. FIG. 5 is a longitudinal sectional view showing a modified example of the holding portion constituting the connecting member.

  A movement detection device 10 shown in FIG. 1 is, for example, for detecting the degree of opening and closing of a control valve 1 that controls the circulation amount of exhaust gas in an exhaust gas recirculation device (EGR) of an internal combustion engine. The control valve is opened and closed by the power of the motor or the like according to a command from a control unit provided in the automobile.

  The movement detection device 10 includes a housing 11 that is a fixed portion. The housing 11 is formed of a non-magnetic material by injection molding with a synthetic resin material. A thrust bearing 13 is attached to the lower portion of the housing 11, and a shaft portion 12a is slidably held in the Y1-Y2 direction on the thrust bearing 13. The shaft portion 12a moves in the Y1-Y2 direction according to the opening degree of the control valve 1 when the control valve 1 opens and closes. A moving part 12 b is integrally formed on the upper part of the shaft part 12 a, and the shaft part 12 a and the moving part 12 b move up and down in the cylinder 11 a inside the housing 11. The shaft portion 12a and the moving portion 12b are formed of a nonmagnetic material such as a synthetic resin material. A compression coil spring 17 is housed in the cylinder 11a. The compression coil spring 17 constantly urges the shaft portion 12a and the moving portion 12b in the Y2 direction. The compression coil spring 17 is made of a nonmagnetic material such as stainless steel for springs.

  A guide portion for linearly moving the moving portion 12b in the Y1-Y2 direction is provided in the cylinder 11a, and the shaft portion 12a and the moving portion 12b are guided by the thrust bearing 13 and the guide portion to be Y1- It is moved linearly in the Y2 direction. A guide surface 14 is formed on the inner surface of the cylinder 11a on the X1 side. The guide surface 14 is a plane extending in the direction orthogonal to the paper surface of FIG. 1 and in the Y1-Y2 direction.

  A holding recess 15 is formed in the housing 11 on the X1 side of the guide surface 14. A magnetic detector 16 is held in the holding recess 15. The magnetic detector 16 is fixed in close contact with the positioning surface 15a on the X2 side of the holding recess 15. The dimension of the guide surface 14 and the positioning surface 15a in the X direction is determined with high accuracy by dimensional control when the housing 11 is manufactured. For this purpose, the distance in the X direction between the magnetic detector 16 in close contact with the positioning surface 15a and the guide surface 14 is set with high accuracy.

  The magnetic detector 16 can detect a change in strength of the magnetic flux in the X1 direction and the X2 direction and a change in the direction thereof, and includes a detection element such as a Hall element or a magnetoresistive effect element.

  As shown in FIG. 1, a sliding holder 20 is provided in the cylinder 11 a, and a magnet 30 is held on the sliding holder 20. A connecting member (plate spring) 40 is provided between the sliding holder 20 and the moving portion 12 b, and the sliding holder 20 is pressed against the guide surface 14 by the elastic force of the connecting member 40. When the shaft portion 12a and the moving portion 12b move in the Y1-Y2 direction according to the opening degree of the control valve 1, the sliding holder 20 slides in close contact with the guide surface 14 together with the moving portion 12b.

  As shown in FIGS. 3 and 4, the sliding holder 20 has a thin rectangular parallelepiped shape and is formed of a nonmagnetic material such as a synthetic resin material. As shown in FIGS. 1, 3 and 4, an opening 23 is formed on the front side which is the X1 side (the side facing the guide surface 14). The opening 23 has, for example, a rectangular shape, penetrates the sliding holder 20 in the X1-X2 direction, and communicates with a holding recess 24 formed inside the sliding holder 20. Thus, by providing the opening 23 on the surface of the sliding holder 20 facing the guide surface 14, the facing area of the facing surface with respect to the guide surface 14 can be reduced. Alternatively, it is possible to slide more effectively by forming a rail surface that protrudes in the direction of the guide surface 14 and extends in the Y1-Y2 direction on the facing surface (a plurality of rail surfaces may be provided at intervals in the Z1-Z2 direction). The frictional resistance at the time can also be reduced.

  As shown in FIG. 3, the holding recess 24 is formed inside the sliding holder 20 and opens to the back side (X2 side). A back surface 25 facing the X2 side of the sliding holder 20 has a frame shape surrounding the periphery of the opening of the holding recess 24. A portion of the back surface 25 located on the short side on the Y1 side functions as the first support portion 25a, and a portion located on the short side on the Y2 side functions as the second support portion 25b. And the part located in the long side of Z1 side is the side support part 25c, and the part located in the long side of Z2 side is the side support part 25d.

  Positioning protrusions 26a and 26a projecting in the X2 direction are integrally formed on the edge portion on the Z1 side and the edge portion on the Z2 side of the first support portion 25a, respectively, and on the Z1 side of the second support portion 25b. Positioning projections 26b and 26b projecting in the X2 direction are integrally formed on the edge and the edge on the Z2 side, respectively.

  As shown in FIGS. 3 and 4, in the holding recess 24 of the sliding holder 20, the first positioning portions 27a and 27a formed on the Y1 side and the second positioning portions 27b formed on the Y2 side, 27b is provided. As shown in FIG. 4, the pair of first positioning portions 27a, 27a provided on the Y1 side and the pair of second positioning portions 27b, 27b provided on the Y2 side are parallel to the YZ plane. Located on H.

  As shown in FIG. 4, a front inner surface 28a is located on the Y1 side and a front inner surface 28b is located on the Y2 side in the holding recess 24. The front inner surfaces 28a and 28b are formed on the X1 side with respect to the positioning plane H. The front inner surface 28a on the Y1 side is an inclined curved surface or inclined plane that moves in the X1 direction as it goes in the Y2 direction, and the front inner surface 28b on the Y2 side is an inclined curved surface that moves in the X1 direction as it goes in the Y1 direction. Or it is an inclined plane.

  As shown in FIG. 4, in the holding recess 24, a press-fit surface 29a is formed on the inner surface on the Y1 side, and a press-fit surface 29b is formed on the inner surface on the Y2 side. The interval between the press-fitting surface 29a and the press-fitting surface 29b in the Y1-Y2 direction is the same as or slightly shorter than the length of the magnet 30 in the Y1-Y2 direction. The magnet 30 and the sliding holder 20 are positioned by being lightly press-fitted into the 24.

  The magnet 30 is a magnet in which magnetic powder such as Nd—Fe—B is sintered, or a magnet in which the magnetic powder and a small amount of synthetic resin are sintered, and the surface thereof is coated with an epoxy resin. used. As described above, the magnet 30 has a rectangular shape that can be press-fitted into the holding recess 24 of the sliding holder 20. As shown in FIGS. 1 and 3, the magnet 30 is magnetized such that the upper end surface 31 facing the Y1 side and the lower end surface 32 facing the Y2 side are opposite to each other. In the illustrated embodiment, the upper end surface 31 is magnetized with an N pole and the lower end surface 32 is magnetized with an S pole.

  As shown by the broken line in FIG. 4, the surface of the magnet 30 facing the X1 side is a facing surface 33. As shown by broken lines in FIG. 1 and FIG. 4, the opposing surface 33 of the magnet 30 has a shape in which a central region including the central portion 33c protrudes in the X1 direction from the upper end portion 33a and the lower end portion 33b. That is, the facing surface 33 has a curvature only in the Y1-Y2 direction, does not have a curvature in the Z1-Z2 direction, and is a cylindrical curved surface. As shown in FIG. 4, when the center line extending in the X direction by dividing the magnet 30 into two in the Y1-Y2 direction is defined as Ox, the central portion 33c located on the center line Ox in the facing surface 33 is furthest toward the X1 side. It protrudes.

  The magnet 30 has a flange 34 formed on the Z1 side, and a flange 34 formed on the Z2 side, at a position retreating to the X2 side from the facing surface 33. The surfaces facing the X1 side of the flange portions 34, 34 are contact portions 34a, 34a. The contact portions 34a and 34a are planes parallel to the YZ plane.

  As shown in FIG. 1, the magnet 30 is mounted in the holding recess 24 from the back of the sliding holder 20 with the facing surface 33 facing the X1 side. The upper end surface 31 and the lower end surface 32 of the magnet 30 are press-fitted into the press-fitting surface 29a and the press-fitting surface 29b of the holding recess 24 so that the magnet 30 is positioned and held by the sliding holder 20 so as not to move in the Y direction. Is done.

  Further, the contact portions 34a and 34a formed on the flange portions 34 and 34 of the magnet 30 are equally contacted with the first positioning portions 27a and 27a and the second positioning portions 27b and 27b in the holding recess 24. Thus, the relative position of the magnet 30 with respect to the sliding holder 20 in the X1 direction is determined.

  The opposing surface 33 of the magnet 30 has a projecting curved surface shape with the central portion 33c protruding in the X1 direction, and includes the central portion 33c of the opposing surface 33 with the magnet 30 positioned and held in the holding recess 24. The central region enters the inside of the opening 23 of the sliding holder 20. As shown in FIG. 1, when the sliding holder 20 is pressed against the guide surface 14 in the cylinder 11 a of the housing 11, the distance δ between the central portion 33 c of the facing surface 33 and the guide surface 14 does not contact each other. The magnetic flux density of the leakage magnetic field applied from the magnet 30 to the magnetic detector 16 can be increased.

  The connecting member 40 in the present embodiment is formed of a stainless steel plate for springs that is a nonmagnetic material. As shown in FIGS. 1, 2, 3, and 4, the connecting member 40 includes a mounting piece 41 that faces the X2 side. The attachment piece 41 is substantially flat. The connecting member 40 is formed by forming a first bent portion 42 in a U shape on the Y2 side of the mounting piece 41 and folding back the intermediate piece 43. The intermediate piece 43 is substantially flat and extends in the Y1 direction. A second bent portion 44 is formed in a U shape on the Y1 side of the intermediate piece 43, and a pressing piece 45 is folded back. The pressing piece 45 is substantially flat and extends in the Y2 direction.

  The pressing piece 45 of the connecting member 40 has a pair of support holes 48a and 48a opened at the end on the Y1 side with a space in the Z1-Z2 direction, and spaced on the Y2 side in the Z1-Z2 direction. A pair of support holes 48b and 48b are opened.

  As shown in FIGS. 2, 3, and 4, the pressing piece 45 is formed with a pair of holding portions 52, 52 extending in the X <b> 1 direction at an interval in the Z <b> 1-Z <b> 2 direction from the Y1 side end. The pair of holding portions 53, 53 are formed to extend in the X1 direction with an interval in the Z1-Z2 direction from the end portion on the Y2 side.

  The minimum distance T1 between the holding portions 52 and 53 facing in the Y1-Y2 direction when the sliding holder 20 is not held is the width between both side surfaces 20a and 20b of the sliding holder 20 in the Y1-Y2 direction. It is slightly narrower than the dimension T2 (see FIG. 4).

Further, the pressing piece 45 is formed with an elongated notch 45a at the center, and a tongue-shaped auxiliary pressing piece 49 extending integrally from the pressing piece 45 to the Y2 side is formed in the notch 45a. . As shown in FIGS. 2, 3, and 4, the auxiliary pressing piece 49 is deformed so as to slightly protrude from the pressing piece 45 toward the X1 side.
Thus, the three-dimensional connecting member 40 shown in FIG. 2 is formed from one leaf spring.

  After the magnet 30 is mounted in the holding recess 24 of the sliding holder 20, positioning protrusions 26 a and 26 a formed on the back of the sliding holder 20 are inserted into the support holes 48 a and 48 a that open to the pressing piece 45, The positioning protrusions 26b and 26b are inserted into the support holes 48b and 48b. Thereby, the sliding holder 20 is positioned with respect to the connecting member 40. At this time, both side surfaces 20a, 20b of the sliding holder 20 in the Y1-Y2 direction are held by the holding portions 52, 53 formed at the end of the pressing piece 45 in the connecting member 40 in the Y1-Y2 direction. Then, the positioning protrusions 26a, 26a, 26b, 26b protruding from the pressing piece 45 of the connecting member 40 in the X2 direction are melted, crushed and fixed by caulking.

  Thus, a component assembly in which the sliding holder 20, the magnet 30, and the connecting member 40 are integrated is completed. In this component assembly, the auxiliary pressing piece 49 formed on the pressing piece 45 directly urges the back surface 35 of the magnet 30 in the X1 direction. With this urging force, the contact portions 34a and 34a of the magnet 30 move. The magnet 30 is pressed against the positioning portions 27a, 27a and 27b, 27b of the sliding holder 20 and is held in the sliding holder 20 so as not to rattle in the X1-X2 direction.

  In the present embodiment, since both side surfaces 20a, 20b of the sliding holder 20 in the Y1-Y2 direction are held by the holding portions 52, 53 provided on the connecting member 40, the holding portions 52, 53 together with the caulking fixing described above. The sliding holder 20 can be held by the connecting member 40, or even if there is no caulking, or caulking is provided to the extent that it is temporarily fixed when the component assembly is installed in the housing 11. Even so, the sliding holder 20 can be held on the connecting member 40 appropriately and easily.

  As shown in FIGS. 2, 3 and 4, the attachment piece 41 of the connecting member 40 is formed with a holding piece 46 on the Y2 side and a holding piece 47 on the Y1 side. As shown in FIG. 4, one clamping piece 46 is bent at a right angle in the X1 direction, and the other clamping piece 47 is bent in a U shape so as to be elastically deformable in the Y1 direction.

  As shown in FIG. 1, attachment surfaces 12c and 12d facing the X1 side are formed on the moving portion 12b. The mounting surface 12c and the mounting surface 12d are formed with an interval in the Y1-Y2 direction, and the mounting surface 12c and the mounting surface 12d are located on the same plane parallel to the YZ plane. And the clamping protrusion 12e which protrudes to a X1 direction is integrally formed between the attachment surface 12c and the attachment surface 12d.

  As shown in FIG. 2, after the connecting member 40 is attached to the sliding holder 20, as shown in FIG. 1, the attachment piece 41 of the connecting member 40 is in close contact with the attachment surfaces 12c and 12d of the moving part 12b. At this time, the clamping protrusion 12e is clamped from the Y1-Y2 direction by the clamping piece 46 and the clamping piece 47. Since the sandwiching piece 47 can be elastically deformed, the sandwiching protrusion 12e is securely sandwiched between the sandwiching piece 46 and the sandwiching piece 47 without causing rattling in the Y1-Y2 direction. The connecting member 40 is positioned in the X1-X2 direction with respect to the moving portion 12b by attaching the attachment piece 41 to the attachment surfaces 12c and 12d, and sandwiching the sandwiching protrusion 12e with the sandwiching pieces 46 and 47, Positioned in the Y1-Y2 direction. Further, although not shown, the moving portion 12b is provided with a positioning mechanism for positioning the attachment piece 41 of the connecting member 40 in the Z1-Z2 direction.

  After the sliding holder 20 and the connecting member 40 are attached to the moving part 12b as described above, the moving part 12b and the shaft part 12a are mounted in the cylinder 11a of the housing 11 shown in FIG. On the moving part 12b, stoppers 51, 51 facing the back part of the pressing piece 45 of the connecting member 40 with a little space are formed integrally protruding with a space in the Y1-Y2 direction. Therefore, even when the pressing piece 45 of the connecting member 40 is pushed in the X2 direction when the moving part 12b is assembled in the cylinder 11a, the pressing piece 45 hits the stoppers 51 and 51, and an excessive deformation stress is applied to the connecting member 40. It can be prevented from acting.

  As shown in FIG. 1, in a state in which the movement detecting device 10 is assembled, the connecting member 40 is slightly compressed in the X2 direction, and the sliding holder is moved by the elastic restoring force of the connecting member 40 in the X1 direction. 20 is pressed against the guide surface 14 in the cylinder 11a.

  When the moving part 12b formed integrally with the shaft part 12a moves in the Y1-Y2 direction, the sliding holder 20 moves while being pressed in the direction of the guide surface 14 by the connecting member 40, so that the magnetic detector 16 and the magnet 30 Can be set with high accuracy, and excellent detection accuracy can be obtained.

  In addition, the connecting member 40 is provided with holding portions 52 and 53 on both sides in the Y1-Y2 direction that is the moving direction of the moving portion 12b, and the holding portions 52 and 53 face the Y1-Y2 direction of the sliding holder 20. Both side surfaces 20a and 20b are held. As a result, when a strong impact is applied from the shaft portion 12a to the moving direction (Y1-Y2 direction) of the moving portion 12b, the impact force can be relaxed by the holding portions 52, 53. The impact force applied to the portion 26b can be suppressed, or even if the caulking fixing portion is damaged by the impact force, the holding portions 52 and 53 can prevent the sliding holder 20 from being detached from the connecting member 40.

  Thus, in this embodiment, it is possible to improve both impact resistance as well as detection accuracy.

  As shown in FIGS. 1, 2, 3, and 4, the holding portions 52, 53 have shapes in which the tips 52 a, 53 a are folded back inward (directions of both side surfaces 20 a, 20 b of the sliding holder 20). The folded portion comes into contact with both side surfaces 20 a and 20 b of the sliding holder 20.

  The connecting member 40 is a leaf spring, and the sliding holder 20 can be pressed and held by the elastic force of the holding portions 52 and 53 by adopting the structure of the holding portions 52 and 53 described above. Thereby, the impact force can be easily absorbed by the holding portions 52 and 53, and the impact resistance can be improved more effectively. Further, as in this embodiment, by forming the ends 52a and 53a of the holding portions 52 and 53 inwardly, the strength and springiness of the holding portions 52 and 53 can be improved with a simple structure. It is.

  Or as shown to Fig.5 (a), the holding parts 54 and 55 can be bent so that it may become substantially S shape in the Y1-Y2 direction, and the spring property of the holding parts 54 and 55 can also be improved. As shown to Fig.5 (a), each holding | maintenance part 54 and 55 has the part 54a and 55a bent toward each side 20a and 20b direction which opposes. Since the minimum distance between the opposing portions 54a and 55a in the Y1-Y2 direction before holding the sliding holder 20 is slightly smaller than the width dimension between both side surfaces 20a and 20b of the sliding holder 20, sliding When the holder 20 is inserted between the holding portions 54 and 55, the elastic force of the holding portions 54 and 55 effectively acts inward from the side surfaces 20a and 20b, whereby the sliding holder 20 can be appropriately held.

  Alternatively, as shown in FIG. 5B, for example, projections 20c and 20d projecting on both side surfaces 20a and 20b facing the Y1-Y2 direction of the sliding holder 20 are formed, and the holding portions 56 and 67 are formed as the projections. It is also possible to have a structure in which the sliding holder 20 is held by the holding portions 56 and 57 by being bent so as to extend from the side surface to the lower surface of the portions 20c and 20d. Note that the protrusions 20c and 20d are not formed on the sliding holder 20, and the side surfaces 20a and 20b are substantially flat surfaces, so that the holding portions 56 and 57 extend from the side surfaces 20a and 20b to the lower surface 20e of the sliding holder 20. It is good also as the holding structure extended and formed.

  In addition, the connecting member (leaf spring) 40 shown in FIG. 2 has an attachment piece 41 fixed to the moving portion 12b, and is folded back from the attachment piece 41 by the first bent portion 42 to move the moving portion 12b (Y1). -Y2 direction), and a pressing piece 45 that is folded back from the intermediate piece 43 at the second bent portion 44 and extends in the opposite direction to the intermediate piece 43 is provided. The attachment piece 41, the intermediate piece 43, and the pressing piece 45 are also parallel to the guide surface 14 in the cylinder 11a in the attachment state of FIG. The holding portions 52 and 53 are provided integrally with the pressing piece 45, and the sliding holder 20 is held in a space formed between the pressing piece 45 and the holding portions 52 and 53. It has become.

  When the connecting member 40 having the above structure is used, the sliding holder 20 is biased with respect to the guiding surface 14 both when the sliding holder 20 slides in the one direction and when sliding in the other direction. The load can be pressed with a small load, and when the sliding holder 20 slides the guide surface 14 in both directions, the adhesiveness with the guide surface 14 can be secured, and rattling is unlikely to occur during movement.

  Further, when the connecting member 40 composed of a leaf spring having the above structure is used, when the moving part 12b is moving, the connecting member 40 is not easily elastically deformed by the force acting in the moving direction, and the moving part 12b is not moved. In the middle, it is possible to suppress the occurrence of displacement in the moving direction (Y1-Y2 direction) between the moving unit 12b and the sliding holder 20, and the detection accuracy can be improved. On the other hand, the connecting member 40 in this embodiment is not easily elastically deformed in the moving direction even when a strong impact is applied in the moving direction (Y1-Y2) of the moving part 12b. If the structure is not provided, the impact force is likely to be applied to the caulking fixing portion between the sliding holder 20 and the connecting member 40 via the connecting member 40, and the caulking fixing portion is damaged, and the sliding holder 20 is detached from the connecting member 40. It tends to occur. On the other hand, as in the present embodiment, the holding portions 52 and 53 are provided on both sides in the moving direction of the pressing piece 45 of the connecting member (leaf spring) 40, so that the connecting member 40 having the above structure is used. Even if a strong impact is applied in the moving direction of the moving part 12b, the holding parts 52 and 53 can easily absorb the impact force, and therefore the sliding holder 20 can be hardly detached from the connecting member 40, and the impact resistance is effectively improved. It is possible.

  The connecting member 40 in the present embodiment is provided with holding portions for holding the both side surfaces 20a and 20b of the sliding holder 20 only on both sides in the Y1-Y2 direction, which is the moving direction of the moving portion 12b. Thus, it is possible to provide holding portions on both sides in the X1-X2 direction orthogonal to the moving direction.

  The number of holding parts is not limited. Accordingly, one holding portion may be provided on each of the Y1 side and the Y2 side, but the connecting member 40 shown in FIGS. 2 and 3 has a pressing piece 45 at the center of the end portion on the Y1 side. Since the integral second bent portion 44 is provided, the holding portions 52 are respectively provided on both sides of the second bent portion 44 from the Y1 side of the pressing piece 45 as shown in FIG. , 52 is preferable because the slide holder 20 can be held in a well-balanced manner.

DESCRIPTION OF SYMBOLS 1 Control valve 10 Movement detection apparatus 11 Housing 12a which is a fixed part Shaft part 12b Moving part 12e, 12d Mounting surface 14 Guide surface 16 Magnetic detector 20 Sliding holder 23 Opening part 24 Holding recessed part 25a 1st support part 25b 2nd Support portion 26a First positioning projection 26b Second positioning projection 30 Magnet 33 Opposing surface 40 Connecting member (leaf spring)
41 Attachment piece 42 1st bending part 43 Intermediate piece 44 2nd bending part 45 Pressing piece 49 Auxiliary pressing pieces 52-57 Holding part

Claims (10)

  A moving unit; a magnet that moves together with the moving unit; a magnetic detector that is installed in the fixed unit and detects a leakage magnetic field from the magnet; and a guide surface that holds the magnet and is provided in the fixed unit A sliding holder that slides between the moving part and the sliding holder, and presses the sliding holder in the guide surface direction and faces the sliding holder in the sliding direction. And a connecting member that includes a holding portion that is held from a surface.   The movement detecting device according to claim 1, wherein the sliding holder is pressed and held by an elastic force of the holding portion.   The movement detecting device according to claim 2, wherein the connecting member is a plate spring, and the holding portion is bent toward the both side surfaces of the sliding holder.   The movement detection device according to claim 3, wherein the holding portion has a shape in which an end portion of the leaf spring is folded inward.   The movement detection device according to claim 1, wherein the sliding holder is held by the holding portion. The connecting member is a leaf spring, and the leaf spring has an attachment piece fixed to the moving portion, and is folded back from the attachment piece at a first bent portion and extends in the moving direction of the moving portion. An intermediate piece, and a pressing piece that is folded back from the intermediate piece at a second bent portion and extends in a direction opposite to the intermediate piece,
6. The holding part is provided integrally with the pressing piece, and the sliding holder is held in a space formed between the pressing piece and each holding part. The movement detection device according to item 1.   The movement according to claim 6, wherein the sliding holder is provided with a support portion arranged at an interval in the moving direction of the moving portion, and an elastic pressing force from the pressing piece acts on the support portion. Detection device.   The mounting piece is provided with a holding piece arranged at an interval in the moving direction of the moving part, and a part of the moving part is held by the holding piece from both sides in the moving direction. Item 8. The movement detection device according to Item 6 or 7.   The movement detection according to any one of claims 6 to 8, wherein the pressing piece is integrally provided with an auxiliary pressing piece that directly presses the magnet and positions the magnet on the sliding holder. apparatus.   The movement detecting device according to claim 1, wherein a shaft portion is provided integrally with the moving portion, and the shaft portion protrudes outside from a housing which is the fixed portion.

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