JP6195379B2 - Position detection device - Google Patents

Description

  The present invention relates to a non-contact type position detection device having a magnet and a sensor unit that detects the operation of the magnet.

  The non-contact type position detection device is superior in durability with no wear on the contact part and more movable than the contact type position detection device that requires physical contact between the movable body and the sensor unit. It has the advantage that the part can be airtight. For this reason, it is used for the position sensor which measures the air pressure in a motor vehicle, the pressure sensor which measures the pressure of the liquid in household appliances, etc.

  As such a conventional example, Patent Document 1 proposes a non-contact linear position sensor (position detection device) 800 having a magnet 840 and a magnetic sensor 882 that detects the operation of the magnet 840. FIG. 17 is a longitudinal sectional view of a linear position sensor 800 in Conventional Example 1 (Patent Document 1).

  A linear position sensor 800 shown in FIG. 17 includes a housing 822 and a lower actuator housing 823 that form a cavity 826 and a cavity 827 partitioned by a flexible rubber boot 825 (diaphragm), and is disposed in the cavity 826 and accommodated in a magnet carrier 810. A magnet 840 that moves in the vertical direction (Z direction shown in FIG. 17), a magnetic sensor 882 that generates an electrical signal indicating the position of the magnet 840 in the vertical direction, and a tube 831 that extends out of the housing 822 from the cavity 826. And a shaft 870 that is held by the blanket 860 and penetrates the cavity 827 and extends out of the lower actuator housing 823.

  Further, the linear position sensor 800 has a tube 831 connected to a vacuum source such as an intake manifold of an engine or a vacuum tank, receives a change in air pressure due to the vacuum source, changes the air pressure in the cavity 826, and the flexible rubber boot 825. The (diaphragm) moves up and down. Then, the magnet carrier 810 urged toward the flexible rubber boot 825 (diaphragm) by the spring 850 moves up and down together with the flexible rubber boot 825 (diaphragm), and the position of the magnet 840 accommodated in the magnet carrier 810 is changed. It can be detected by the magnetic sensor 882.

  However, depending on the device connected to the other end of the shaft 870 (in the conventional example 1, the bypass of the turbocharger attached to the engine or the wastegate valve), the shaft 870 is tilted as it moves up and down, and the magnet carrier 810 is accompanied accordingly. The (magnet 840) sometimes tilted (shown in the drawing described in Patent Document 1 of Conventional Example 1). For this reason, the magnetic field change by the magnet 840 occurs, and there is a problem that the detection accuracy by the magnetic sensor 882 is reduced as compared with the case where the magnet 840 does not tilt.

  In response to this problem, Patent Document 2 proposes a diaphragm device 900 having a moving shaft 905 and a detection shaft 921. FIG. 18 is a longitudinal cross-sectional configuration diagram of a diaphragm device 900 in Conventional Example 2 (Patent Document 2).

  A diaphragm device 900 shown in FIG. 18 has a detection shaft 921 that can move in the axial direction, and includes a lift sensor 920 that detects the displacement of the detection shaft 921, a diaphragm 903 that deforms in response to external pressure fluctuations, and a diaphragm 903. And a moving shaft 905 that can move in the direction in which the diaphragm 903 moves in accordance with the deformation. The distal end 905a on one side of the moving shaft 905 is spherical and is configured to press one end of the detection shaft 921. As a result, even if the moving shaft 905 is inclined due to the influence of the device to which the moving shaft 905 is connected, the tip 905a of the moving shaft 905 is spherical, and thus the moving shaft 905 presses one end of the detection shaft 921. At this time, the configuration is such that the influence of the inclination of the moving shaft 905 is hardly transmitted to the detection shaft 921. For this reason, even if the moving shaft 905 is inclined, there is an effect that a measurement error in detecting the moving distance of the detection shaft 921 by the lift sensor 920 does not occur. The lift sensor 920 uses a magnet and a magnetic sensor similar to those in the first conventional example.

Special table 2011-505574 gazette JP 2012-102782 A

  However, in the conventional example 2, the problem of the conventional example 1 is solved brilliantly. However, when vibration or the like is transmitted from the outside to the diaphragm device 900, the moving shaft 905 and the detection shaft 921 are displaced, and the moving shaft 905 is moved. There has been a concern that the movement of the sensor will not be transmitted to the detection shaft 921 well. For this reason, there is a possibility that the detection accuracy of the diaphragm device 900 is lowered.

  The present invention solves the above-described concerns, and an object thereof is to provide a position detection device in which a decrease in detection accuracy is suppressed.

  In order to solve this problem, a position detection device of the present invention includes a movable magnet, a sensor unit that detects an operation of the movable magnet, and a drive unit that moves the movable magnet. A movable body that can be driven integrally with a movable magnet is provided, and a connecting portion that couples the movable magnet and the movable body by a magnetic force is provided between the movable magnet and the movable body. It is said.

  According to this, the position detection device of the present invention is configured so that the movable magnet is not tilted even when the moving body is slightly tilted and the connecting portion that is engaged with the moving body is tilted. It is connected. For this reason, since a movable magnet will move linearly, the fall of the detection accuracy of a sensor part by receiving the influence of a moving body can be suppressed. In addition, since the coupling portion and the movable magnet are coupled by magnetic force, the coupling portion and the movable magnet are not displaced even when there is an external influence such as vibration, so that the movement of the driving unit can be reliably performed on the movable magnet. I can tell you. By these things, the position detection apparatus with which the fall of detection accuracy was suppressed can be provided.

  In the position detection device of the present invention, the connecting portion includes a magnetic body disposed so as to face the movable magnet, and a holder portion to which the moving body is fixed and holds the magnetic body. It is characterized by.

  According to this, the movable magnet and the moving body are connected by the magnetic force using the movable magnet that is the detection target. For this reason, a connection part can be comprised, without increasing a number of parts. As a result, the position detection device can be easily and inexpensively manufactured.

  In the position detection device of the present invention, at least one surface of the movable magnet and the magnetic body facing each other is covered with a resin.

  According to this, when the movable magnet moves, it can be prevented that the movable magnet and the magnetic body are slidably contacted to scrape the movable magnet. Thereby, since there is no change in the magnetic field from the movable magnet due to scraping of the movable magnet, it is possible to further suppress a decrease in detection accuracy.

  In the position detection device of the present invention, at least one of the facing surfaces where the movable magnet and the magnetic body face each other is a curved surface.

  According to this, even when the moving body moves while tilting, the curved surface absorbs the tilt and the contact between the movable magnet and the magnetic body can be made smooth. For this reason, a movable magnet can be moved, without giving the influence of inclination with respect to a movable magnet. As a result, the magnetic field generated by the movable magnet becomes a desired value, so that the sensor unit can accurately detect the operation of the movable magnet.

  Further, in the position detection device of the present invention, the connecting portion includes a magnet holder portion that holds the first connecting magnet on one side, and a moving body holder portion that holds the second connecting magnet on one side, The movable magnet is disposed opposite to the other side of the magnet holder portion, the movable body is fixed to the other side of the movable body holder portion, and the first coupling magnet and the second coupling magnet are opposed to each other. The opposing surfaces of the first connecting magnet and the second connecting magnet are magnetized with a plurality of sets of magnetic poles.

  According to this, even if there is an external influence such as vibration, the connecting portion that connects the movable magnet and the moving body portion by the magnetic force is configured by the first connecting magnet and the second connecting magnet. Deviation can be reliably suppressed. As a result, the operation of the drive unit can be reliably transmitted to the movable magnet, and a decrease in detection accuracy can be further suppressed.

  In the position detection device of the present invention, at least one surface of the first coupling magnet and the second coupling magnet facing each other is covered with a resin.

  According to this, when a movable magnet moves, it can prevent that a 1st connection magnet and a 2nd connection magnet come into sliding contact, and a 1st connection magnet and a 2nd connection magnet are scraped. As a result, the durability of the position detection device can be improved.

  In the position detection device of the present invention, at least one of the facing surfaces where the first coupling magnet and the second coupling magnet face each other is a curved surface.

  According to this, even when the moving body moves while tilting, the curved surface absorbs the tilt, and the contact between the first and second connecting magnets facing each other is made smooth. Can do. For this reason, a movable magnet can be moved, without giving the influence of inclination with respect to a movable magnet. As a result, the magnetic field generated by the movable magnet becomes a desired value, so that the sensor unit can accurately detect the operation of the movable magnet.

  In the position detection device of the present invention, even if the moving body is slightly tilted and the connecting portion that is engaged with the moving body is tilted, the movable magnet is not tilted and is connected by magnetic force while maintaining the same posture. For this reason, since a movable magnet will move linearly, the fall of the detection accuracy of a sensor part by receiving the influence of a moving body can be suppressed.

It is a disassembled perspective view explaining the position detection apparatus of 1st Embodiment of this invention. It is a perspective view explaining the position detection apparatus of a 1st embodiment of the present invention. It is a side view explaining the position detection apparatus of a 1st embodiment of the present invention. It is a top view explaining the position detection apparatus of the first embodiment of the present invention. It is a figure explaining the position detection apparatus of 1st Embodiment of this invention, Comprising: It is sectional drawing in the VV line | wire shown in FIG. It is a figure explaining the position detection apparatus of 1st Embodiment of this invention, Comprising: It is the structure sectional drawing which showed the movable magnet shown in FIG. 5, the moving body, and the connection part. It is a figure explaining operation | movement of the position detection apparatus concerning 1st Embodiment of this invention, Comprising: It is sectional drawing which shows the state which the movable magnet moved upwards from the state of FIG. It is a disassembled perspective view explaining the position detection apparatus of 2nd Embodiment of this invention. It is a perspective view explaining the position detection apparatus of 2nd Embodiment of this invention. It is a side view explaining the position detection apparatus of 2nd Embodiment of this invention. It is a top view explaining the position detection apparatus of the second embodiment of the present invention. It is a figure explaining the position detection apparatus of 2nd Embodiment of this invention, Comprising: It is sectional drawing in the XII-XII line | wire shown in FIG. It is a figure explaining the position detection apparatus of 2nd Embodiment of this invention, Comprising: It is the structure sectional drawing which showed the movable magnet shown in FIG. 12, a moving body, and a connection part. It is a figure explaining operation | movement of the position detection apparatus concerning 2nd Embodiment of this invention, Comprising: It is sectional drawing which shows the state which the movable magnet moved upwards from the state of FIG. FIGS. 15A and 15B are diagrams illustrating a modification of the position detection device according to the first embodiment of the present invention, in which FIG. 15A is a configuration cross-sectional view illustrating Modification 1, and FIG. FIG. It is a figure explaining the modification of the position detection apparatus concerning 2nd Embodiment of this invention, Comprising: Fig.16 (a) is a structure sectional drawing which shows the modification 5, FIG.16 (b) is a modification. FIG. It is a longitudinal direction sectional view of a linear position sensor in Conventional Example 1. It is a vertical direction cross-section block diagram of the diaphragm apparatus in the prior art example 2.

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

[First Embodiment]
FIG. 1 is an exploded perspective view for explaining a position detection apparatus 101 according to a first embodiment of the present invention. FIG. 2 is a perspective view illustrating the position detection apparatus 101 according to the first embodiment of the present invention. FIG. 3 is a side view illustrating the position detection device 101 according to the first embodiment of the present invention. FIG. 4 is a top view for explaining the position detection apparatus 101 according to the first embodiment of the present invention.

  The position detection device 101 according to the first embodiment of the present invention has an appearance as shown in FIGS. 2 to 4 and is formed by combining an upper case K11 and a lower case K19. As shown in FIG. K11 and movable magnet 12 that moves in the space inside lower case K19, sensor unit 13 that detects the operation of movable magnet 12, movable body 15 that can be driven integrally with movable magnet 12, movable magnet 12 and movable body 15, and a drive unit 16 that moves the movable magnet 12. In addition, the position detection device 101 of the first embodiment is connected to a connector case H18 containing a connector CN for electrical connection with an external device, and a pneumatic control device such as a decompression source (not shown) by a tube or the like. Fitting F19.

  FIG. 5 is a diagram for explaining the position detection device 101 according to the first embodiment of the present invention, and is a cross-sectional view taken along the line V-V shown in FIG. 4. FIG. 6 is a diagram showing the movable magnet 12, the moving body 15, and the connecting portion 14 shown in FIG. FIG. 7 is a view for explaining the operation of the position detection apparatus 101 according to the first embodiment of the present invention, and is a cross section when the movable magnet 12 moves upward from the lower limit state of FIG. 5 and is positioned in the upper limit state. FIG.

  First, the upper case K11 and the lower case K19 of the position detection device 101 are manufactured by processing a metal material, and when the upper case K11 and the lower case K19 are combined, they are shown in FIGS. Thus, the accommodating part K1s which accommodates the movable magnet 12 and the drive part 16, and can move the movable magnet 12 is formed.

  Further, as shown in FIGS. 1 to 3, the upper case K11 is provided with a fitting F19 extending vertically from the side wall of the intermediate portion. The fitting F19 is formed in a hollow shape, and the housing portion K1s is connected to the outside through the hollow space. Further, on the upper side of the upper case K11, an engagement receiving portion K1g to which one side of the connector case H18 is inserted and engaged is provided, and the connector case H18 is provided.

  Further, as shown in FIG. 1, the lower case K19 has an opening K19h opened at the center of the bottom surface K19b. The opening K19h has a movable body, which will be described later, as shown in FIG. Fifteen moving axes J5 are inserted. Further, the opening K19h keeps the inside of the accommodating portion K1s on the lower case K19 side at atmospheric pressure.

  Next, the movable magnet 12 of the position detection device 101 uses a cylindrical permanent magnet, and is held by a movable magnet holder H12 made of synthetic resin, as shown in FIGS. Yes. The movable magnet holder H12 is formed so as to cover the cylindrical outer shape of the movable magnet 12, and the movable magnet holder H12 includes four rib portions H12r formed to project in four directions in plan view (see FIG. 1). ), A spacer portion S4 provided on the side facing the connecting portion 14 of the movable magnet 12 is provided.

  Further, as shown in FIGS. 5 and 7, the rib portion H12r of the movable magnet holder H12 is configured to come into contact with the inner wall surface K11p of the upper case K11. Thus, when the movable magnet 12 moves up and down (moves in the Z direction shown in FIG. 5) between the lower limit state of FIG. 5 and the upper limit state of FIG. 7, this inner wall surface K11p becomes a guide surface, and the movable magnet 12 Guides up and down movement. As a result, the movable magnet 12 moves linearly in the vertical direction (Z direction shown in FIG. 5). Further, since the rib portion H12r of the movable magnet holder H12 and the inner wall surface K11p of the upper case K11 are repeatedly slidably contacted, the movable magnet 12 is compared with the case where the movable magnet 12 and the inner wall surface K11p are slidably contacted. The surface can be prevented from being scraped.

  Further, as shown in FIGS. 5 to 7, the spacer portion S4 of the movable magnet holder H12 is disposed so as to cover the surface of the movable magnet 12 on the connecting portion 13 side with a synthetic resin. Further, the spacer portion S4 has a curved surface facing the connecting portion 14. In addition, in 1st Embodiment, although spacer part S4 was formed separately, you may form integrally with the main body of the movable magnet holder H12. Moreover, it is suitable to use a fluororesin or polyoxymethylene (POM, polyoxymethylene) as a synthetic resin material of the movable magnet holder H12.

  Next, the sensor unit 13 of the position detection device 101 is formed by packaging a hall element and a semiconductor element with a thermosetting synthetic resin, and as shown in FIGS. 5 and 7, the side wall of the upper case K11 is formed. Is disposed on the outer wall surface K11q facing the movable magnet 12. Since the sensor unit 13 is mounted on the circuit board and mounted on the one side of the connector case H18 together with the circuit board, the connector case H18 is merely engaged with the engagement receiving part K1g of the upper case K11. It is disposed at a position facing K11q. And the sensor part 13 detects the change of the magnetic field accompanying the operation | movement of the up-down direction of the movable magnet 12, and has detected the position of the movable magnet 12. FIG.

  Next, as shown in FIGS. 5 to 7, the connecting portion 14 of the position detection device 101 includes a magnetic body M4 disposed so as to face the movable magnet 12, and a holder portion H4 that holds the magnetic body M4. , And is configured. For this reason, the movable magnet 12 and the magnetic body M4 of the connecting portion 14 are connected by magnetic force. Thereby, the movable magnet 12 which is a detection target is used, and the movable magnet 12 and the connecting portion 14 can be connected by a magnetic force. For this reason, the connection part 14 can be comprised, without increasing a number of parts. As a result, the position detection device 101 can be easily and inexpensively manufactured. In the first embodiment of the present invention, a permanent magnet is used as the magnetic body M4, and a synthetic resin is used as the holder portion H4.

  Next, the moving body 15 of the position detecting device 101 can be driven integrally with the movable magnet 12, and as shown in FIGS. 5 and 7, the piston portion to which the holder portion H4 of the connecting portion 14 is fixed. P5, a moving shaft J5 engaged with the piston portion P5, and a reinforcing plate A5 engaged with the moving shaft J5 and disposed below the piston portion P5 (Z2 direction shown in FIG. 5). It is configured. For this reason, the movable magnet 12 and the movable body 15 are coupled by magnetic force by the coupling portion 14 disposed between the movable magnet 12 and the movable body 15.

  The piston portion P5 of the moving body 15 is made of a metal material and is formed in a cylindrical shape as shown in FIGS. 1, 5 and 7, and has a bottom surface portion 15b on one side. In the center of the bottom surface portion 15b, It has a hole 15h through which the moving shaft J5 is inserted.

  The reinforcing plate A5 of the moving body 15 is made of a metal material and is formed in a disk shape as shown in FIG. 1, and has a through hole 15k through which the moving shaft J5 is inserted at the center.

  The moving axis J5 of the moving body 15 is made of a metal material, is formed in a substantially cylindrical shape as shown in FIG. 1, and has a cylindrical protruding portion 15t having a small outer shape on one side (the Z1 side shown in FIG. 1). doing. As shown in FIGS. 5 and 7, the moving shaft J5 has a protrusion 15t inserted through the hole 15h and the through hole 15k, and a piston portion P5 and a reinforcing plate using a bearing or a ring (not shown). It is fixed to A5. In addition, the other side has a cylindrical shape with a flat end surface in FIG. 1, but can be changed into various shapes for convenience of connection with the operation target component to be connected.

  Further, as described above, the moving shaft J5 is assembled so as to protrude from the opening K19h of the lower case K19 to the outside of the lower case K19, and is connected to an operation target component such as a valve (not shown). For this reason, when the operation target component is connected to the movement axis J5, as described above, the movement axis J5 is tilted as a whole with the vertical movement of the movable body 15 due to the influence of the operation target component. May tilt. However, since the position detection device 101 is provided with the connecting portion 14 that connects the movable magnet 12 and the moving body 15 by magnetic force between the movable magnet 12 and the moving body 15, the moving body 15 is slightly Even if the connecting portion 14 that is tilted and engaged with the moving body 15 is tilted, the movable magnet 12 is not tilted and is connected by a magnetic force while maintaining the same posture. For this reason, since the movable magnet 12 moves linearly, a decrease in detection accuracy of the sensor unit 13 due to the influence of the moving body 15 can be suppressed. Moreover, since the coupling portion 14 and the movable magnet 12 are coupled by magnetic force, the coupling portion 14 and the movable magnet 12 are not displaced even when there is an external influence such as vibration, and the movement of the driving portion 16 can be performed. It can be reliably transmitted to the movable magnet 12.

  In the first embodiment of the present invention, as described above, one surface of the movable magnet 12 facing the magnetic body M4 of the connecting portion 14 is provided on the spacer portion S4 configured to cover the surface with resin. Is provided. Thereby, when the movable magnet 12 moves up and down, it can prevent that the movable magnet 12 and the magnetic body M4 slide, and the movable magnet 12 and the magnetic body M4 are shaved.

  In the first embodiment of the present invention, as described above, one of the opposing surfaces of the movable magnet 12 and the magnetic body M4 facing each other is a curved surface, so even when the moving body 15 moves while tilting. The curved surface of the spacer portion S4 absorbs the inclination, and the contact between the movable magnet 12 (spacer portion S4) and the magnetic body M4 can be made smooth. For this reason, the movable magnet 12 can be linearly moved without affecting the movable magnet 12 by an inclination. Thereby, since the magnetic field by the movable magnet 12 becomes a desired value, the sensor unit 13 can detect the operation of the movable magnet 12 with high accuracy.

  Finally, as shown in FIGS. 5 and 7, the drive unit 16 of the position detection device 101 includes a diaphragm D6 that divides the inside of the housing unit K1s into two spaces, and a biasing member F6 that biases the bottom 16b of the diaphragm D6. And is configured. The two spaces refer to a decompression chamber on the upper case K11 side of the diaphragm D6 and an atmosphere chamber on the lower case K19 side of the diaphragm D6.

  The diaphragm D6 of the drive unit 16 is made of a rubber material having elasticity, and is formed in a cylindrical shape as shown in FIG. 1, and a flange portion 16f sandwiched between the upper case K11 and the lower case K19, and a deformable deformation. It is comprised from the part 16e and the bottom part 16b which has the through-hole 16h (refer FIG. 5) by which the movement axis J5 is inserted in the center. As shown in FIGS. 5 and 7, the diaphragm D6 is disposed so that the bottom portion 16b of the diaphragm D6 is sandwiched between the bottom surface portion 15b of the piston portion P5 and the reinforcing plate A5, and the moving shaft J5 is formed in the through hole. It is inserted through 16 h and fixed to the moving body 15. Thereby, even if the diaphragm D6 deform | transforms, the bottom part 16b of the diaphragm D6 can maintain a plane.

  The urging member F6 of the drive unit 16 is a coil spring whose both ends are flattened, and as shown in FIGS. 5 and 7, one end abuts against the ceiling surface of the upper case K11 and the other end is the bottom surface of the piston part P5. It is in contact with the portion 15b. The urging member F6 urges the piston portion P5 downward.

  The drive unit 16 configured as described above moves the movable magnet 12 in the vertical direction by deformation of the diaphragm D6. That is, when the decompression chamber is depressurized from the fitting F19 connected to the pneumatic control device by a tube or the like from the lower limit state of FIG. 5, the diaphragm D6 is deformed and resists the urging force of the urging member F6. The bottom part 16b of the first part moves upward (Z1 direction shown in FIG. 5). When the force due to the pressure reduction in the decompression chamber is greater than the biasing force of the biasing member F6, the bottom 16b of the diaphragm D6 is moved to the upper limit state of FIG. On the other hand, when the decompression of the decompression chamber is released, the bottom 16b of the diaphragm D6 is moved to the lower limit state of FIG. 5 by the biasing force of the biasing member F6. In this manner, the movable magnet 12 and the moving body 15 are moved in the vertical direction by the drive unit 16 moving in the vertical direction. The position detection device 101 according to the first embodiment of the present invention detects the position of the movable magnet 12 in the vertical direction at this time.

  The effects of the position detection device 101 according to the first embodiment of the present invention configured as described above will be described below.

  Since the position detection device 101 according to the first embodiment of the present invention includes the connecting portion 14 that connects the movable magnet 12 and the moving body 15 by the magnetic force between the movable magnet 12 and the moving body 15, Even if the body 15 is slightly tilted and the connecting portion 14 that is engaged with the moving body 15 is tilted, the movable magnet 12 is not tilted and is connected by a magnetic force while maintaining the same posture. For this reason, since the movable magnet 12 moves linearly, a decrease in detection accuracy of the sensor unit 13 due to the influence of the moving body 15 can be suppressed. Moreover, since the coupling portion 14 and the movable magnet 12 are coupled by magnetic force, the coupling portion 14 and the movable magnet 12 are not displaced even when there is an external influence such as vibration, and the movement of the driving portion 16 can be performed. It can be reliably transmitted to the movable magnet 12. As a result, it is possible to provide the position detection apparatus 101 in which a decrease in detection accuracy is suppressed.

  In addition, since the connecting portion 14 has the magnetic body M4 disposed so as to face the movable magnet 12, the movable magnet 12 and the movable body 15 are connected using the movable magnet 12 that is a detection target. Is made possible by magnetic force. For this reason, the connection part 14 can be comprised, without increasing a number of parts. As a result, the position detection device 101 can be easily and inexpensively manufactured.

  Moreover, since the mutually opposing surfaces of the movable magnet 12 and the magnetic body M4 are covered with resin, when the movable magnet 12 moves, the movable magnet 12 and the magnetic body M4 come into sliding contact with each other, and the movable magnet 12 and the magnetic body It is possible to prevent the M4 from being scraped. Thereby, since there is no change in the magnetic field from the movable magnet 12 due to the scraping of the movable magnet 12, it is possible to further suppress a decrease in detection accuracy.

  Further, since one of the opposing surfaces of the movable magnet 12 and the magnetic body M4 facing each other is a curved surface, even when the moving body 15 moves while tilting, the curved surface absorbs the tilt and the movable magnet 12 is moved. And the magnetic body M4 can be made smooth. For this reason, the movable magnet 12 can be linearly moved without affecting the movable magnet 12 by an inclination. Thereby, since the magnetic field by the movable magnet 12 becomes a desired value, the sensor unit 13 can detect the operation of the movable magnet 12 with high accuracy.

[Second Embodiment]
FIG. 8 is an exploded perspective view illustrating the position detection device 102 according to the second embodiment of the present invention. FIG. 9 is a perspective view for explaining a position detection apparatus 102 according to the second embodiment of the present invention. FIG. 10 is a side view illustrating the position detection device 102 according to the second embodiment of the present invention. FIG. 11 is a top view for explaining a position detection device 102 according to the second embodiment of the present invention. Moreover, the position detection apparatus 102 of 2nd Embodiment differs in the structure of the connection part 24 with respect to 1st Embodiment. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The position detection device 102 according to the second embodiment of the present invention has an appearance as shown in FIGS. 9 to 11 and is formed by combining an upper case K11 and a lower case K19. As shown in FIG. K11 and movable magnet 22 that moves in the space in lower case K19, sensor unit 13 that detects the operation of movable magnet 22, movable body 25 that can be driven integrally with movable magnet 22, movable magnet 22 and movable body 25, and a drive unit 26 that moves the movable magnet 22. In addition, the position detection device 102 of the second embodiment is connected to a connector case H18 having a connector CN for electrical connection with an external device, and a pneumatic control device such as a decompression source (not shown) by a tube or the like. Fitting F19.

  FIG. 12 is a diagram illustrating the position detection device 102 according to the second embodiment of the present invention, and is a cross-sectional view taken along line XII-XII shown in FIG. FIG. 13 is a diagram showing the movable magnet 22, the moving body 25, and the connecting portion 24 shown in FIG. 12. FIG. 14 is a diagram for explaining the operation of the position detection apparatus 102 according to the second embodiment of the present invention, and is a cross section when the movable magnet 22 moves upward from the lower limit state of FIG. 12 and is positioned in the upper limit state. FIG.

  First, the upper case K11 and the lower case K19 of the position detection device 102 are manufactured by processing a metal material as in the first embodiment of the present invention, and the upper case K11 and the lower case K19 are combined. In this case, as shown in FIGS. 12 and 14, the movable magnet 22 and the drive unit 26 are accommodated, and the accommodating part K1s in which the movable magnet 22 is movable is formed. Since the upper case K11 and the lower case K19 have the same configuration as that of the first embodiment of the present invention, detailed description thereof is omitted.

  Next, the movable magnet 22 of the position detection device 102 uses a cylindrical permanent magnet. As shown in FIGS. 8, 12, and 13, a cylindrical movable magnet holder H22 made of synthetic resin is used. Is retained. The movable magnet 22 is held by the movable magnet holder H22 being inserted into the cylinder of the movable magnet 22. As the synthetic resin material for the movable magnet holder H22, it is preferable to use polybutylene terephthalate resin (PBT, polybutyleneterephtalate) or polyamide resin (polyamide).

  Next, as in the first embodiment of the present invention, the sensor unit 13 of the position detection device 102 is formed by packaging a Hall element and a semiconductor element with a thermosetting synthetic resin. As shown in FIG. 14, it is disposed on the outer wall surface K11q facing the movable magnet 22 with the side wall of the upper case K11 interposed therebetween. The sensor unit 13 detects the position of the movable magnet 22 by detecting a change in the magnetic field accompanying the vertical movement of the movable magnet 22.

  Next, as shown in FIGS. 12 to 14, the connecting portion 24 of the position detection device 102 includes a magnet holder portion H14, a first connecting magnet M14 held on one side of the magnet holder portion H14, and a first connecting portion. It has a second connecting magnet M24 disposed to face the magnet M14, and a moving body holder H24 that holds the second connecting magnet M24 on one side. And as shown in FIG. 13, the opposing surface of the 1st connection magnet M14 and the 2nd connection magnet M24 is magnetized by the multiple sets of magnetic poles. For this reason, the 1st connecting magnet M14 and the 2nd connecting magnet M24 come to be connected by strong magnetic force. Thus, even when there is an external influence such as vibration, the displacement in the plane direction (X direction shown in FIG. 13) can be suppressed, and the operation of the drive unit 26 can be reliably transmitted to the movable magnet 22.

  As shown in FIGS. 12 and 14, the movable magnet 22 is disposed opposite to the other side of the magnet holder portion H <b> 14 of the connecting portion 24, and the movable magnet 22 and the connecting portion 24 are connected by magnetic force. . The moving body 25 is fixed to the other side of the moving body holder portion H24. For this reason, the movable magnet 22 and the moving body 25 are connected by magnetic force. In addition, although the movable magnet 22 and the connection part 24 are connected suitably by magnetic force, the movable magnet holder H22 and the magnet holder part H14 may be fitted and the movable magnet 22 and the connection part 24 may be connected. .

  Moreover, in 2nd Embodiment of this invention, as shown in FIG. 12 thru | or 14, it covers so that the surface may be covered with resin on the one surface of the 1st connection magnet M14 facing the 2nd connection magnet M24. A configured spacer portion S24 is provided. Thereby, when the movable magnet 22 moves up and down, the first coupling magnet M14 and the second coupling magnet M24 slide, and the first coupling magnet M14 and the second coupling magnet M24 come into sliding contact with each other and the movable magnet 22 is in contact. Can be prevented from scraping.

  Furthermore, in 2nd Embodiment of this invention, as shown in FIG. 12 thru | or 14, the opposing surface which opposes the 2nd connection magnet M24 in this spacer part S24 is a curved surface. That is, one of the facing surfaces where the first connecting magnet M14 and the second connecting magnet M24 face each other is a curved surface. In the second embodiment of the present invention, synthetic resin is used as the magnet holder portion H14 and the moving body holder portion H24.

  Next, the moving body 25 of the position detecting device 102 can be driven integrally with the movable magnet 22, and the moving body holder portion H24 of the connecting portion 24 is fixed as shown in FIGS. A piston portion P5; a moving shaft J5 engaged with the piston portion P5; and a reinforcing plate A5 engaged with the moving shaft J5 and disposed below the piston portion P5 (Z2 direction shown in FIG. 12). Configured. For this reason, the movable magnet 22 and the movable body 25 are coupled by magnetic force by the coupling portion 24 disposed between the movable magnet 22 and the movable body 25.

  The piston part P5, the reinforcing plate A5, and the moving shaft J5 of the moving body 25 are formed using a metal material as in the first embodiment. Since the piston part P5, the reinforcing plate A5, and the moving shaft J5 have the same configuration as that of the first embodiment of the present invention, detailed description thereof is omitted.

  When the moving axis J5 of the moving body 25 configured in this way is connected to an operation target component such as a valve (not shown), as described above, the vertical movement of the moving body 25 is influenced by the operation target component. As a result, the movement axis J5 is inclined and the entire moving body 25 is inclined. However, since the position detecting device 102 is provided with the connecting portion 24 that connects the movable magnet 22 and the moving body 25 by magnetic force between the movable magnet 22 and the moving body 25, the moving body 25 is slightly Even if one side (moving body holder portion H24 side) of the connecting portion 24 that is tilted and engaged with the moving body 25 is tilted, the movable magnet 22 is not tilted and is connected by a magnetic force while maintaining the same posture. . For this reason, since the movable magnet 22 moves linearly, a decrease in detection accuracy of the sensor unit 13 due to the influence of the moving body 25 can be suppressed. Moreover, since one side of the connecting portion 24 and the movable magnet 22 are connected via the other side (magnet holder portion H14 side) of the connecting portion 24 by magnetic force, even when there is an external influence such as vibration. The one side of the connecting portion 24 and the other side of the connecting portion 24 are not displaced, and the movement of the driving portion 26 can be reliably transmitted to the movable magnet 22.

  In addition, as described above, in the position detection device 102, since one of the opposing surfaces where the first coupling magnet M14 and the second coupling magnet M24 face each other is a curved surface, the moving body 25 moves while tilting. However, the curved surface can absorb the inclination, and the contact of the first contact magnet M14 and the second connection magnet M24 facing each other can be made smooth. For this reason, the movable magnet 22 can be linearly moved without affecting the movable magnet 22 by an inclination. Thereby, since the magnetic field by the movable magnet 22 becomes a desired value, the sensor unit 13 can detect the operation of the movable magnet 22 with high accuracy.

  Finally, as in the first embodiment of the present invention, as shown in FIGS. 12 and 14, the drive unit 26 of the position detection device 102 includes a diaphragm D6 that divides the interior of the housing unit K1s into two spaces, and a diaphragm D6. And an urging member F6 for urging the bottom portion 26b. The two spaces refer to a decompression chamber on the upper case K11 side of the diaphragm D6 and an atmosphere chamber on the lower case K19 side of the diaphragm D6. Further, since the drive unit 26 has the same configuration as that of the first embodiment of the present invention, detailed description thereof is omitted.

  In the position detection device 102 configured as described above, when the decompression chamber is decompressed from the lower limit state shown in FIG. 12, the diaphragm D6 is deformed and resists the urging force of the urging member F6, and the bottom of the diaphragm D6. 26b moves upward (Z1 direction shown in FIG. 12). Then, when the force due to the decompression of the decompression chamber is greater than the urging force of the urging member F6, the bottom 26b of the diaphragm D6 is moved to the upper limit state of FIG. On the other hand, when the decompression of the decompression chamber is released, the bottom 26b of the diaphragm D6 is moved to the lower limit state of FIG. 12 by the biasing force of the biasing member F6. In this way, the movable part 22 moves in the vertical direction by moving the drive unit 26 in the vertical direction. The position detection device 102 according to the second embodiment of the present invention detects the position of the movable magnet 22 in the vertical direction at this time.

  The effects of the position detection device 102 according to the second embodiment of the present invention configured as described above will be collectively described below.

  As described above, the position detection device 102 according to the second embodiment of the present invention includes the connecting portion 24 that connects the movable magnet 22 and the moving body 25 by magnetic force between the movable magnet 22 and the moving body 25. Therefore, even if the moving body 25 is slightly tilted and the one side (moving body holder H24 side) of the connecting portion 24 that is engaged with the moving body 25 is tilted, the movable magnet 22 is not tilted and remains as it is. It is connected by magnetic force while maintaining. For this reason, since the movable magnet 22 moves linearly, a decrease in detection accuracy of the sensor unit 13 due to the influence of the moving body 25 can be suppressed. Moreover, since one side of the connecting portion 24 and the movable magnet 22 are connected via the other side (magnet holder portion H14 side) of the connecting portion 24 by magnetic force, even when there is an external influence such as vibration. The one side of the connecting portion 24 and the other side of the connecting portion 24 are not displaced, and the movement of the driving portion 26 can be reliably transmitted to the movable magnet 22.

  In addition, since the connecting portion 24 that connects the movable magnet 22 and the moving body 25 by magnetic force is configured by the first connecting magnet M14 and the second connecting magnet M24, even when there is an external influence such as vibration, the planar direction It is possible to reliably suppress the deviation. As a result, the operation of the drive unit 26 can be reliably transmitted to the movable magnet 22 and a decrease in detection accuracy can be further suppressed.

  Further, since the surfaces of the first connecting magnet M14 and the second connecting magnet M24 facing each other are covered with resin, when the movable magnet 22 moves, the first connecting magnet M14 and the second connecting magnet M24 slide. In contact therewith, it is possible to prevent the first coupling magnet M14 and the second coupling magnet M24 from being scraped. As a result, the durability of the position detection device 102 can be improved.

  In addition, since at least one of the portions where the magnet holder portion H14 and the moving body holder portion H24 come into contact with each other is a curved surface, even when the moving body 25 moves while tilting, the curved surface absorbs the tilt and opposes it. The contact of the first contact magnet M14 and the second connection magnet M24 in contact with each other can be made smooth. For this reason, the movable magnet 22 can be moved without affecting the movable magnet 22 by an inclination. Thereby, since the magnetic field by the movable magnet 22 becomes a desired value, the sensor unit 13 can detect the operation of the movable magnet 22 with high accuracy.

  In addition, this invention is not limited to the said embodiment, For example, it can deform | transform and implement as follows, These embodiments also belong to the technical scope of this invention.

  FIG. 15 is a diagram for explaining a modification of the position detection apparatus 101 according to the first embodiment of the present invention. FIG. 15A shows the configuration of the modification 1 showing the movable magnet 12 and the connecting portion B14. It is sectional drawing, FIG.15 (b) is a structure sectional drawing of the modification 2 which showed the movable magnet 12 and the connection part C14. FIG. 16 is a diagram for explaining a modification of the position detection apparatus 102 according to the second embodiment of the present invention. FIG. 16A shows the configuration of the modification 5 showing the movable magnet 22 and the connecting portion B24. It is sectional drawing and FIG.16 (b) is a structure sectional drawing of the modification 6 which showed the movable magnet 22 and the connection part 24. As shown in FIG.

<Modification 1>
In the first embodiment, the holder portion H4 of the connecting portion 14 is configured using a synthetic resin material. However, as shown in FIG. 15A, the holder portion BH4 is formed using a soft magnetic material such as iron. May be suitably configured. Thereby, the holder part BH4 becomes a yoke, the magnetic force is further improved, and the connection by the magnetic force between the movable magnet 12 and the connecting part B14 can be strengthened.

<Modification 2>
In the first embodiment, the connecting portion 14 is composed of the magnetic body M4 and the holder portion H4. However, as shown in FIG. 15B, the magnetic body CM4 is made of a soft magnetic material such as iron. It may be configured. Thereby, the number of parts can be reduced, and the position detection apparatus 101 can be manufactured easily and inexpensively. Further, as shown in FIG. 15B, a spacer portion BS4 disposed between the movable magnet 12 and the magnetic body CM4 is provided on the magnetic body CM4 side, and the connecting portion C14 is formed by the magnetic body CM4 and the spacer portion BS4. May be configured.

<Modification 3>
In the first embodiment, one of the surfaces of the movable magnet 12 and the magnetic body M4 facing each other is covered with the resin. However, both surfaces may be covered with the resin. Furthermore, both surfaces may be curved.

<Modification 4>
In the said 1st Embodiment, although the permanent magnet was used as the magnetic body M4, the block body using the material of soft magnetic bodies, such as iron, may be sufficient.

<Modification 5>
In the second embodiment, the movable body holder portion H24 of the connecting portion 24 is configured using a synthetic resin material. However, as illustrated in FIG. 16A, the movable body holder portion H24 is moved using a soft magnetic material such as iron. The body holder part BH24 may be suitably configured. Thereby, the moving body holder part BH24 becomes a yoke, magnetic force improves more, and the connection by the magnetic force of the movable magnet 22 and connection part B24 can be strengthened.

<Modification 6>
As shown in FIG. 16B, a configuration in which a rib portion CH22r similar to that of the first embodiment is provided on the outer periphery of the movable magnet 22 of the second embodiment may be employed. Thereby, when the movable magnet 22 moves up and down (moving in the Z direction shown in FIG. 12) between the lower limit state of FIG. 12 and the upper limit state of FIG. 14, the inner wall surface K11p of the upper case K11 becomes a guide surface. The vertical movement of the movable magnet 22 is guided. As a result, the movable magnet 22 moves linearly in the vertical direction (Z direction shown in FIG. 12).

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the object of the present invention.

12, 22 Movable magnet 13 Sensor part 14, 24, B14, B24, C14 Connecting part H4, BH4 Holder part H14 Magnet holder part H24, BH24 Moving body holder part M4, CM4 Magnetic body M14 First connecting magnet M24 Second connecting magnet 15, 25 Moving body 16, 26 Drive unit 101, 102 Position detection device

Claims (7)

In a position detection device having a movable magnet, a sensor unit that detects the operation of the movable magnet, and a drive unit that moves the movable magnet,
A movable body that can be driven integrally with the movable magnet;
A position detecting device, wherein a connecting portion for connecting the movable magnet and the moving body by a magnetic force is provided between the movable magnet and the moving body.   The said connection part has the magnetic body arrange | positioned so as to oppose the said movable magnet, and the holder part to which the said moving body adheres and hold | maintains the said magnetic body, The Claim 1 characterized by the above-mentioned. Position detection device.   The position detection device according to claim 2, wherein at least one surface of the movable magnet and the magnetic body facing each other is covered with a resin.   4. The position detection device according to claim 2, wherein at least one of facing surfaces where the movable magnet and the magnetic body face each other is a curved surface. 5. The connecting portion has a magnet holder portion that holds the first connecting magnet on one side, and a moving body holder portion that holds the second connecting magnet on the one side,
The movable magnet is disposed opposite to the other side of the magnet holder part,
The movable body is fixed to the other side of the movable body holder part,
The first connecting magnet and the second connecting magnet are arranged opposite to each other;
The position detecting device according to claim 1, wherein opposing surfaces of the first connecting magnet and the second connecting magnet are magnetized by a plurality of sets of magnetic poles.   The position detecting device according to claim 5, wherein at least one surface of the first connecting magnet and the second connecting magnet facing each other is covered with a resin.   The position detection device according to claim 5 or 6, wherein at least one of opposing surfaces of the first connecting magnet and the second connecting magnet facing each other is a curved surface.