JP3191531U - Position detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detecting device capable of reducing rattling of a holder in a vibrating environment and extending the sliding life of the holder. A holder holding a magnet, magnetic resistance elements 31 and 32, an urging member 40 for urging the holder, and a case 50 for accommodating the holder are provided. The holder has a magnet holding portion 23, a circular shaft portion 24, a tapered portion 25, and an urging member receiving portion 26. The case 50 accommodates the first receiving portion 51 that receives the shaft portion 24, the second receiving portion 52 that receives the tapered portion 25, and the urging member 40 at a position eccentric from the virtual axis C1 of the shaft portion 24. A member accommodating portion 53 is provided. The distance from the reference position W1 of the holder to the first receiving portion 51 so that the load applied to the first receiving portion 51 at the initial position of the holder is larger than the load applied to the second receiving portion 52. D1 is shorter than the distance D2 to the second receiving portion 52. [Selection diagram] FIG. 10

Description

  The present invention relates to a position detection apparatus that detects the position of a detected object to be displaced.

  Conventionally, for example, many output values from a position detection device have been used for various types of vehicle control, and occupy important positions for control.

  As such a position detection sensor, Patent Document 1 describes a sensor that can prevent relative vibration of a slider receiver (holder). FIG. 12 is a cross-sectional view showing the sensor 100. FIG. 13 is a view showing a state in which the slider receiver 115 and the brush 114 are incorporated in the casing 111.

  As shown in FIG. 12, the sensor 100 includes a casing 111, a shaft 112 that can enter and exit the casing 111, a resistance substrate 113, a brush 114, a slider receiver 115, and a slider receiver 115. And a return spring 116 for applying a spring force. The casing 111 includes a pair of guide grooves 119 and 120 extending in a direction parallel to the axis of the shaft 112 as shown in FIG. The slider receiver 115 includes a protrusion 122 that engages with one guide groove 119 and a protrusion 124 that engages with the other guide groove 120. The slider receiver 115 slides in a direction parallel to the axis of the shaft 112 against the return spring 116 by the pressing force to the shaft 112. By disposing the return spring 116 eccentrically from the axis of the shaft 112, the protrusions 122 and 124 of the slider receiver 115 are pressed against the guide grooves 119 and 120. In this state, an elastic force is exerted by the return spring 116 to restrict the movement of the slider receiver 115 in a direction parallel to the axis of the shaft 112. In addition, tapered surfaces (regulating surfaces) 122a and 124a are provided at pressure contact portions between the protrusions 122 and 124 of the slider receiver 115 and the guide grooves 119 and 120, respectively. Therefore, the slider receiver 115 is also restricted from moving in a direction orthogonal to a plane including the axis of the shaft 112 and the center line of the return spring 116. Thereby, the relative vibration of the slider receiver 115 can be prevented.

  In a traveling vehicle, the position detection device is exposed to a severe vibration state according to the road surface condition or the like. In such a vibration environment, the position detection device is required to suppress the rattling of the slider receiver (holder) and to have a long life performance of sliding of the slider receiver (holder).

Japanese Patent No. 2771376

  However, it has not been considered how to apply a load to the sliding contact portion of the holder in order to prevent the holder from rattling in a vibration environment.

  The present invention has been made to solve the above-described problems, and is a position detection device capable of reducing the shakiness of the holder in a vibration environment and extending the life of sliding of the holder. The purpose is to provide.

  The present invention includes a holder having a magnet holding portion in which a magnet constituting a detection portion is held, a magnetoresistive element constituting the detection portion together with the magnet, a biasing member biasing the holder, and the biasing And a case for housing the holder and the magnetoresistive element, wherein the holder has a circular shaft portion, a taper portion, and an urging member receiving portion, A first receiving portion that receives the shaft portion, a second receiving portion that receives the tapered portion, and a position that is eccentric from the virtual axis of the shaft portion so as to press the holder against the first receiving portion and the second receiving portion. An urging member accommodating portion for accommodating the urging member, and a load applied to the first receiving portion at an initial position of the holder is greater than a load applied to the second receiving portion. So that Distance to the first receiving portion from the reference position of the serial holder characterized in that it is shorter than the distance to the second receiving unit.

  According to this, the distance from the reference position of the holder to the first receiving portion is shorter than the distance to the second receiving portion, and the load applied to the first receiving portion is applied to the second receiving portion. It is comprised so that it may become larger than the load applied with respect to it. Accordingly, it is possible to reduce the shakiness of the holder in a vibration environment and to prolong the life of sliding of the holder. Moreover, since the shakiness on the shaft portion side can be suppressed by making the load of the first receiving portion larger than that of the second receiving portion, the operating force is easily transmitted.

  Further, in the position detection device of the present invention, the case has a restricting portion that restricts movement of the holder toward the shaft portion by the urging force of the urging member, and the urging member receiver And the restricting portion are arranged so as to sandwich the virtual axis of the shaft portion in a direction intersecting the extending direction of the shaft portion, and the restricting portion is an extension of the shaft portion of the holder It is arranged so as to abut on the side far from the urging member receiving part in a direction along the surface and in a direction intersecting with the direction in which the shaft part extends, and in the initial position of the holder, the holder is The urging force of the urging member is received in a state where the movement toward the front side is restricted by the restricting portion.

  According to this, by arranging the urging member receiving portion and the holder restricting portion with the virtual axis interposed therebetween, the load on the first receiving portion side becomes a large load at the initial position, and the shaft portion Shaking can be suppressed.

  In the position detection device of the present invention, the reference position of the holder is a direction in which the shaft portion extends when the holder holding the magnet is pivotally supported in another direction intersecting the direction in which the shaft portion extends. In the direction in which the shaft portion extends, on the side close to the shaft portion of the magnet holding portion, and in the direction intersecting the direction in which the shaft portion extends. It is characterized in that the holding member is located closer to the biasing member receiving portion than a position corresponding to a portion where the restricting portion contacts.

  The reference position is a position where the holder holding the magnet is suspended without rotating in the direction in which the shaft portion extends when the holder is supported in another direction intersecting the direction in which the shaft portion extends. By setting the position of the biasing member receiving portion with respect to this reference position, an appropriate load setting can be performed.

  Further, in the position detection device of the present invention, in the maximum operation position, the first load from the reference position of the holder is such that a load applied to the first receiving portion is larger than a load applied to the second receiving portion. The distance to the first receiving part is shorter than the distance to the second receiving part.

  According to this aspect, by always increasing the load on the first receiving portion side, the shaft portion is always stabilized without rattling.

  In the position detection device of the present invention, the biasing member receiving portion of the holder is arranged on the shaft portion side with respect to the reference position.

  According to this aspect, the urging force is sufficiently transmitted to the first receiving portion and the second receiving portion by being arranged closer to the shaft portion than the reference position.

  In the position detecting device of the present invention, the biasing member receiving portion of the holder is disposed closer to the shaft portion than the magnet.

  According to this aspect, the urging force can be sufficiently transmitted by disposing the urging member receiving portion closer to the shaft portion than the magnet.

  Further, in the position detection device of the present invention, the biasing member receiving portion of the holder is disposed on the upper surface side of the holder, and the first receiving portion of the case is disposed on the lower surface side of the shaft portion, The taper portion of the holder is formed on an upper surface side of a portion opposite to the shaft portion with the magnet interposed therebetween.

  With such a positional relationship, a load can be applied appropriately.

  According to the present invention, the distance from the reference position of the holder to the first receiving portion is such that the load applied to the first receiving portion is larger than the load applied to the second receiving portion. 2 shorter than the distance to the receiving part. Therefore, it is possible to provide a position detection device capable of reducing the shakiness of the holder under a vibration environment and extending the life of sliding of the holder.

It is a perspective view which shows the position detection apparatus of embodiment of this invention. It is a perspective view of the direction different from FIG. It is a disassembled perspective view which shows the position detection apparatus of embodiment of this invention. It is a front view which shows the position detection apparatus of embodiment of this invention. It is a right view which shows the position detection apparatus of embodiment of this invention. It is sectional drawing cut | disconnected by the VV line | wire of FIG. It is explanatory drawing which shows the external shape of a holder. It is sectional drawing cut | disconnected by the VIII-VIII line of FIG. It is explanatory drawing which expanded the holder and 2nd receiving part vicinity of FIG. It is explanatory drawing which shows the position detection apparatus of an initial state. It is explanatory drawing which shows the position detection apparatus of the maximum operation position. It is sectional drawing which shows the conventional sensor. It is a figure which shows the state which integrated the slider receiver and the brush in the casing in the conventional sensor.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is a perspective view showing a position detection device 1 according to an embodiment of the present invention. FIG. 2 is a perspective view in a different direction from FIG. FIG. 3 is an exploded perspective view showing the position detection device 1 according to the embodiment of the present invention. FIG. 4 is a front view showing the position detection apparatus 1 according to the embodiment of the present invention. FIG. 5 is a right side view showing the position detection apparatus 1 according to the embodiment of the present invention. 6 is a cross-sectional view taken along line VV in FIG. FIG. 7 is an explanatory view showing the outer shape of the holder 20. 4 is a rear view showing an outer shape of a case 50. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is an explanatory diagram enlarging the vicinity of the holder 20 and the second receiving portion 52 of FIG. FIG. 10 is an explanatory diagram showing the position detection device 1 in the initial state. FIG. 11 is an explanatory diagram showing the position detection device 1 for the maximum operation position. In the following description, the Z1 side in FIG. 1 is described as the upper side, the Z2 side as the lower side, the X1 side as the left side, the X2 side as the right side, the Y1 side as the front side, and the Y2 side as the rear side. This is for ease of explanation, and does not limit the mounting direction of the position detection device 1.

  In the position detection device 1 of the present embodiment, the detection unit 10 is accommodated in a case 50, and the detection unit 10 detects the position of the shaft portion 24 protruding from the case 50. As shown in FIG. 3, the detection unit 10 includes a holder 20 having a magnet holding unit 23 that holds the magnets 21 and 22, magnetoresistive elements 31 and 32 for detecting the relative positions of the magnets 21 and 22, and It is comprised by. As shown in FIG. 3, the holder 20 is formed with a magnet holding part 23, a shaft part 24, a taper part 25, and an urging member receiving part 26.

  The case 50 is formed by molding a synthetic resin, and as shown in FIG. 3, a bearing portion 50 a through which the shaft portion 24 of the holder 20 is inserted is formed. Further, the case 50 is provided with a connector portion 50b, and terminals 33 connected to the magnetoresistive elements 31 and 32 of the detecting portion 10 are disposed. Further, as shown in FIGS. 1 to 4, the case 50 is formed with an attachment hole 50 c, and a bolt is inserted into the attachment hole 50 c to be fixed to a device (not shown). The case 50 has a role of waterproofing and dustproofing for protecting the detection unit 10 as well as fixing to the device and positioning.

  As shown in FIG. 6, the case 20 accommodates the holder 20 and the magnetoresistive elements 31 and 32. Further, as shown in FIG. 6, when the virtual axis C1 of the shaft portion 24 of the holder 20 is hypothesized, the urging member 40 is accommodated in the case 50 at a position eccentric from the virtual axis C1 upward (Z1 side). A member accommodating portion 53 is formed.

  The biasing member 40 is a metal coil spring. As shown in FIG. 6, the urging member 40 is supported by a cover 57 on the rear side (Y2 side). The cover 57 is formed by molding a synthetic resin, and is engaged with the case 50 and attached. Thus, the urging member 40 is sandwiched between the urging member receiving portion 26 of the holder 20 and the cover 57 and is compressed so as to always urge the holder 20 forward.

  In the position detection device 1 of the present embodiment, a seal member 58 is applied so as to close a gap between the case 50 and the cover 57. Further, a seal member 58 is also applied to the gap between the magnetoresistive elements 31 and 32 and the case 50. Further, the connector portion 50b is closed watertight while a wiring material (not shown) is electrically connected to the terminal 33. For this reason, the position detection apparatus 1 of this embodiment is kept waterproof and dustproof.

  Next, the feature of the holder 20 of the position detection device 1 of the present embodiment will be described in more detail.

  In the holder 20, magnets 21 and 22 are fixed by press-fitting, as shown in FIG. 7, to a magnet holder 23 formed of synthetic resin. A circular shaft portion 24 is formed to protrude from the magnet holding portion 23 to the front side (Y1 side). Further, taper portions 25 are formed on the right side (X1 side) and the left side (X2 side) of the magnet holding portion 23 on the rear side (Y2 side) when viewed from the shaft portion 24. An urging member receiving portion 26 is formed on the upper side (Z1 side) where the shaft portion 24 protrudes from the magnet holding portion 23. In addition, the magnet holding part 23, the shaft part 24, the taper part 25, and the biasing member receiving part 26 may be formed by integrally molding a synthetic resin, or a plurality of members are assembled by press-fitting or the like. There may be. Moreover, you may form the axial part 24 with a nonmagnetic metal material.

  The biasing member receiving portion 26 of the holder 20 is disposed closer to the shaft portion 24 than the magnets 21 and 22. Further, the urging member receiving portion 26 is disposed on the upper surface side (Z1 side) of the holder 20 in the vicinity of the extending surface 20a from which the shaft portion 24 protrudes. If the virtual axis C1 of the shaft portion 24 is hypothesized, it is a position eccentric from the virtual axis C1 upward (Z1 side). The taper portion 25 of the holder 20 is formed on the upper surface side of the portion opposite to the shaft portion 24 across the magnets 21 and 22. Further, when the holder 20 holding the magnets 21 and 22 is pivotally supported by a virtual axis C2 imaginary in another direction (X1-X2 direction) intersecting the direction in which the shaft portion 24 extends, the holder 20 is suspended without rotating. The matching position is assumed to be a reference position W1. That is, the reference position W1 of the holder 20 is the position of the center of gravity of the holder 20 in a state where the magnets 21 and 22 are held. As shown in FIG. 7, the virtual axis C2 is an axis in the X1-X2 direction passing through the reference position W1, and the reference position W1 is a rotation center when the holder 20 is pivotally supported by the virtual axis C2. . The reference position W1 is a direction (Z1-Z2) that is close to the shaft portion 24 of the magnet holding portion 23 and intersects the direction in which the shaft portion 24 extends in the direction in which the shaft portion 24 extends (Y1-Y2 direction). In the direction), the magnet holding portion 23 is positioned closer to the biasing member receiving portion 26 than the position corresponding to the portion with which the restricting portion 54 abuts.

  The case 50 is formed in a shape that enables the operation of the holder 20 according to the shape of the holder 20. A bearing portion 50a is formed so that the shaft portion 24 of the holder 20 can be inserted. A portion on the Z2 side of the bearing portion 50a that receives the shaft portion 24 when the shaft portion 24 receives a load directed downward (Z2 side) is illustrated in FIG. Further, the portion on the Y2 side of the bearing portion 50a with which the magnet holding portion 23 of the holder 20 abuts is illustrated in FIG. The restricting portion 54 restricts the movement of the holder 20 toward the shaft portion 24 by the urging force of the urging member 40.

  Further, as shown in FIGS. 8 and 9, the holder 20 slides on the case 50 along the shapes of the biasing member housing portion 53 in which the biasing member 40 is disposed, the magnet holding portion 23, and the taper portion 25. A movable guide portion 55 is formed.

  The guide portion 55 is provided with a second receiving portion 52 that receives the tapered portion 25. The tapered portion 25 has a shape in which both ends in the X1-X2 direction are inclined downward (Z2 side) and inclined upward (Z1 side) toward the center side where the virtual axis C1 is located, and the second receiving portion 52 is It is formed in a corresponding shape. For this reason, when the taper portion 25 receives an upward load, it does not cause a positional shift in the X1-X2 direction along the inclination of the second receiving portion 52, and the rotational shake with the virtual axis C1 as the rotation axis. Stabilizes without causing

  Next, the operation of the holder 20 that moves from the front side (Y1 side) to the rear side (Y2 side) when the shaft portion 24 of the position detection device 1 of the present embodiment receives an external force will be described.

  As shown in FIGS. 6 and 7, the biasing member receiving portion 26 is disposed on the upper side (Z1 side) with respect to the virtual axis C <b> 1 of the shaft portion 24. Further, the biasing member accommodating portion 53 that accommodates the biasing member 40 is also provided at a position eccentric from the virtual axis C1, and the central axis of the biasing member 40 is located above the virtual axis C1.

  The restricting portion 54 is a portion along the extending surface 20a of the shaft portion 24 of the holder 20 and an urging member in a direction (Z1-Z2 direction) intersecting the direction in which the shaft portion 24 extends (Y1-Y2 direction). It arrange | positions so that the side far from the receiving part 26 may contact | abut. That is, the urging member receiving portion 26 and the restricting portion 54 are disposed so as to sandwich the virtual axis C1 of the shaft portion 24 in a direction intersecting with the direction in which the shaft portion 24 extends. In the initial position of the holder 20 shown in FIG. 6, the urging member receiving portion 26 urged by the urging member 40 is pressed toward the front side (Y1 side), and the holder 20 is moved forward by the restricting portion 54. The urging force by the urging member 40 is received in a state where the movement to is restricted. For this reason, the magnet holding part 23 of the holder 20 abuts on the restricting part 54 and the shaft part 24 acts to apply a load to the first receiving part 51 toward the lower side (Z2 side).

  On the other hand, the rear side (Y2 side) of the holder 20 acts to apply a load toward the upper side (Z1 side) opposite to the shaft portion 24, but the guide portion 55 of the case 50 corresponds to the tapered portion 25. Since it is formed in a shape, it is in a state of being pressed against the second receiving portion 52 of the guide portion 55.

  As shown in FIG. 10, the distance D1 from the reference position W1 to the first receiving portion 51 is set to the second receiving portion 52 (Y2 of the taper portion 25) with respect to the reference position W1 that is the center of gravity position of the holder 20. It is shorter than the distance D2 to the position where the side end is pressed. For this reason, the urging force received from the urging member 40 is distributed so that the load applied to the first receiving portion 51 is larger than the load applied to the second receiving portion 52. In FIG. 10, the right side view of the holder 20 and the sectional view of the case 50 and the like are combined for easy viewing.

  The biasing member receiving portion 26 of the holder 20 is disposed closer to the shaft portion 24 than the reference position W1. The urging force is sufficiently transmitted to the first receiving portion 51 and the second receiving portion 52 by being arranged closer to the shaft portion 24 than the reference position W1. Since the holder 20 is in contact with the first receiving portion 51 and the second receiving portion 52 of the case 50 under a load by the urging force of the urging member 40, rattling in a vibration environment is reduced. The Moreover, since the shakiness by the side of the axial part 24 can be suppressed by making the load of the 1st receiving part 51 larger than the 2nd receiving part 52, it becomes easy to transmit operating force.

  In a state where the shaft portion 24 of the position detecting device 1 of the present embodiment receives an external force and reaches the maximum operation position as shown in FIG. 11, the distance D3 from the reference position W1 to the first receiving portion 51 is as follows. It becomes longer than the distance D1 at the initial position. At this time, it is preferable that the distance D3 is shorter than the distance D2 from the reference position W1 to the second receiving portion 52. In the state shown in FIG. 11, the load on the first receiving portion 51 side is always increased, and the shaft portion 24 is always stable without being shaken.

  Hereinafter, the effect by having set it as this embodiment is demonstrated.

  The position detection device 1 of the present embodiment includes a holder 20 having a magnet holding part 23 that holds magnets 21 and 22, magnetoresistive elements 31 and 32, a biasing member 40 that biases the holder 20, and biasing And a case 50 for housing the member 40, the holder 20, and the magnetoresistive elements 31 and 32. The holder 20 has a circular shaft portion 24, a taper portion 25, and an urging member receiving portion 26. The case 50 includes a first receiving portion 51 that receives the shaft portion 24, a second receiving portion 52 that receives the tapered portion 25, and an urging member 40 that houses the urging member 40 at a position eccentric from the virtual axis C <b> 1 of the shaft portion 24. Member housing portion 53 is provided. From the reference position W1 of the holder 20 to the first receiving portion 51 so that the load applied to the first receiving portion 51 is larger than the load applied to the second receiving portion 52 at the initial position of the holder 20. The distance D1 is shorter than the distance D2 to the second receiving portion 52.

  According to this, the distance D1 from the reference position W1 of the holder 20 to the first receiving part 51 is shorter than the distance D2 to the second receiving part 52, and the load applied to the first receiving part 51 is It is comprised so that it may become larger than the load applied with respect to the 2nd receiving part 52. FIG. Therefore, the shakiness of the holder 20 in a vibration environment can be reduced and the life of sliding of the holder 20 can be increased. Moreover, since the shakiness by the side of the axial part 24 can be suppressed by making the load of the 1st receiving part 51 larger than the load of the 2nd receiving part 52, it becomes easy to transmit operating force.

  The case 50 has a restricting portion 54 that restricts movement of the holder 20 toward the shaft portion 24 by the urging force of the urging member 40. The urging member receiving portion 26 and the restricting portion 54 are The imaginary axis C1 of the shaft portion 24 is disposed so as to be sandwiched in a direction intersecting the direction in which the shaft portion 24 extends. At the same time, the restricting portion 54 is a portion along the extending surface 20a of the shaft portion 24 of the holder 20 and abuts on the side far from the biasing member receiving portion 26 in a direction intersecting with the direction in which the shaft portion 24 extends. Are arranged as follows. For this reason, at the initial position of the holder 20, the holder 20 receives the urging force by the urging member 40 in a state where the movement to the front side is restricted by the restricting portion 54. According to this, since the biasing member receiving portion 26 and the restricting portion 54 of the holder 20 are arranged with the virtual axis C1 interposed therebetween, the load on the first receiving portion 51 side is a large load at the initial position. Thus, rattling of the shaft portion 24 can be suppressed.

  The reference position W1 of the holder 20 does not rotate in the direction in which the shaft portion 24 extends when the holder 20 holding the magnets 21 and 22 is pivotally supported in another direction intersecting the direction in which the shaft portion 24 extends. It is a position to hang on. The reference position W1 is a position close to the shaft portion 24 of the magnet holding portion 23 in the direction in which the shaft portion 24 extends, and in a direction intersecting the direction in which the shaft portion 24 extends, the restricting portion 54 of the magnet holding portion 23 It is located closer to the urging member receiving portion 26 than the position corresponding to the contacted portion. The reference position W1 is a position where the holder 20 holding the magnets 21 and 22 is suspended without rotating in the direction in which the shaft portion 24 extends when the holder 20 is supported in another direction intersecting the direction in which the shaft portion 24 extends. is there. By setting the position of the urging member receiving portion 26 with respect to the reference position W1, an appropriate load can be set.

  Further, the distance D3 from the reference position W1 of the holder 20 to the first receiving portion 51 is set so that the load applied to the first receiving portion 51 is larger than the load applied to the second receiving portion 52 at the maximum operation position. The distance is shorter than the distance D2 to the second receiving portion 52. According to this aspect, by always increasing the load on the first receiving portion 51 side, the shaft portion 24 is always stabilized without rattling.

  Further, the biasing member receiving portion 26 of the holder 20 is disposed closer to the shaft portion 24 than the reference position W1. According to this aspect, the urging force is sufficiently transmitted to the first receiving portion 51 and the second receiving portion 52 by being arranged on the shaft portion 24 side with respect to the reference position W1.

  Further, the urging member receiving portion 26 of the holder 20 is disposed closer to the shaft portion 24 than the magnets 21 and 22. According to this aspect, the urging force can be sufficiently transmitted by disposing the urging member receiving portion 26 closer to the shaft portion 24 than the magnets 21 and 22.

  Further, the biasing member receiving portion 26 of the holder 20 is disposed on the upper surface side of the holder 20, the first receiving portion 51 of the case 50 is disposed on the lower surface side of the shaft portion 24, and the taper portion 25 of the holder 20 is It is formed on the upper surface side of the portion opposite to the shaft portion 24 across the magnets 21 and 22. With such a positional relationship, a load can be applied appropriately.

  As described above, the position detection device 1 according to the embodiment of the present invention has been specifically described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. It is possible. For example, the present invention can be modified as follows and belongs to the technical scope of the present invention.

  In the present embodiment, the distance D3 from the reference position W1 to the first receiving portion 51 at the maximum operation position is shorter than the distance D2 from the reference position W1 to the second receiving portion 52. The aspect which becomes equidistance with D2 may be sufficient. Further, the distance D3 may be longer. In these cases, the load applied to the first receiving portion 51 does not become larger than the load applied to the second receiving portion 52, but the shaft portion 24 rattles if the urging force by the urging member 40 is an appropriate magnitude. Stabilize without.

DESCRIPTION OF SYMBOLS 1 Position detection apparatus 10 Detection part 20 Holder 20a Extension surface 21, 22 Magnet 23 Magnet holding part 24 Shaft part 25 Taper part 26 Energizing member receiving part 31, 32 Magnetoresistive element 33 Terminal 40 Energizing member 50 Case 50a Bearing part 50b connector portion 50c mounting hole 51 first receiving portion 52 second receiving portion 53 urging member housing portion 54 restricting portion 55 guide portion 57 cover 58 seal member C1, C2 virtual axis lines D1, D2, D3 distance W1 reference position

Claims (7)

A holder having a magnet holding part that holds a magnet that constitutes the detection part, a magnetoresistive element that constitutes the detection part together with the magnet, a biasing member that biases the holder, the biasing member, and the holder And a case for housing the magnetoresistive element,
The holder has a circular shaft portion, a tapered portion, and a biasing member receiving portion,
The case includes a first receiving portion that receives the shaft portion, a second receiving portion that receives the tapered portion, and a virtual portion of the shaft portion that presses the holder against the first receiving portion and the second receiving portion. An urging member accommodating portion that accommodates the urging member at a position eccentric from the axis, and
From the reference position of the holder to the first receiving portion, the load applied to the first receiving portion is larger than the load applied to the second receiving portion at the initial position of the holder. A position detecting device, wherein the distance is shorter than the distance to the second receiving portion. The case has a restricting portion that restricts movement of the holder toward the shaft portion by the urging force of the urging member;
The urging member receiving portion and the restricting portion are disposed so as to sandwich the virtual axis of the shaft portion in a direction intersecting with the extending direction of the shaft portion, and the restricting portion is provided on the holder of the holder. It is a part along the extending surface of the shaft part, and is arranged so as to abut on the side far from the biasing member receiving part in the direction intersecting the direction in which the shaft part extends,
2. The position according to claim 1, wherein, at the initial position of the holder, the holder receives a biasing force from the biasing member in a state in which the holder is restricted from moving forward by the restriction portion. Detection device.   The reference position of the holder is a position where the holder holding the magnet is suspended without rotating in the direction in which the shaft portion extends when the holder is supported in another direction intersecting the direction in which the shaft portion extends. In the direction in which the shaft portion extends, the portion where the restricting portion of the magnet holding portion abuts on the side close to the shaft portion of the magnet holding portion and in the direction crossing the direction in which the shaft portion extends. The position detection device according to claim 2, wherein the position detection device is located closer to the urging member receiving portion than a position corresponding to.   The distance from the reference position of the holder to the first receiving portion is set so that the load applied to the first receiving portion is larger than the load applied to the second receiving portion at the maximum operation position. The position detection device according to claim 1, wherein the position detection device is shorter than a distance to the receiving portion.   The position detecting device according to claim 1, wherein the biasing member receiving portion of the holder is disposed closer to the shaft portion than the reference position.   The position detecting device according to claim 1, wherein the biasing member receiving portion of the holder is disposed closer to the shaft portion than the magnet. The biasing member receiving portion of the holder is disposed on the upper surface side of the holder, the first receiving portion of the case is disposed on the lower surface side of the shaft portion, and the taper portion of the holder is the magnet. The position detection device according to claim 1, wherein the position detection device is formed on an upper surface side of a portion opposite to the shaft portion with respect to the shaft portion.