JP2018155667A - Mobile body detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile body detector which can make an accurate detection even if a vibration is generated.SOLUTION: The mobile body detector includes: a magnetic detection element 10 for outputting an electric signal according to the movement of a detection target object; a magnet 20 for applying a magnetic field to the magnetic detection element 10; a lead terminal 30 connected to the magnetic detection element 10; a first housing 40 having a container 43 for containing the magnetic detection element 10, the magnet 20, and the lead terminal 30; a second housing 50 covering the container 43, connected to the first housing 40 to be engaged with the first housing, and facing the detection target object. The first housing 40 includes: a fixing part 42 to be fixed to a fixing target 70; a first protrusion part on the side of the surface where the first and second housings 40 and 50 contact with each other which is adjacent to the fixing part 42; and a second protrusion part on the side of the contact surface of the first and second housings 40 and 50 which is opposite to the fixing part 42.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a moving body detection apparatus.

  A moving body detection device is used to detect the movement of a moving body that moves linearly or rotationally. For example, the moving body detection device fixing structure disclosed in Patent Document 1 includes a sensor unit including a magnetic detection element, a magnet that applies a magnetic field to the magnetic detection element, and a substrate connected to the magnetic detection element. The detection unit is covered with a cover connected to the sensor body and fixed to the device via the cover, and a change in the magnetic field accompanying the movement of the moving body is detected.

JP 2006-208023 A

  In the fixed structure of the moving body detection device disclosed in Patent Document 1, the sensor body is fixed to the device via the cover, so the magnetic detection element or the like may be displaced in the cover due to vibration of the device, etc. There is a problem that the detection accuracy is lowered.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a moving body detection apparatus with high detection accuracy even when vibration occurs.

The moving object detection apparatus 100 of the present invention is
A magnetic detection element 10 for outputting an electrical signal corresponding to the movement of the detection object D;
A magnet 20 for applying a magnetic field to the magnetic detection element 10;
A lead terminal 30 connected to the magnetic detection element 10;
A first housing 40 having an accommodating portion 43 for accommodating the magnetic detection element 10, the magnet 20 and the lead terminal 30;
A second housing 50 that covers and fits the first housing 40 and is disposed to face the detection object D, covering the housing portion 43.
A fixing portion 42 for fixedly installing the first housing 40 on the fixing object 70;
A first protrusion P1 on the fixed portion 42 side of the contact surfaces 41c, 52c of the first and second housings;
A second projecting portion P2 on the opposite side of the fixed portion 42 of the contact surfaces 41c, 52c of the first and second housings;
Is provided.

The second protrusion P2 protrudes from the first protrusion P1.

  The first housing 40 is provided with a first protrusion P1 and a second protrusion P2.

  Alternatively, the second housing 50 is provided with a first protrusion P1 and a second protrusion P2.

  Alternatively, the first housing 40 is provided with either one of the first projecting portion P1 and the second projecting portion P2.

  ADVANTAGE OF THE INVENTION According to this invention, even if a vibration arises, a mobile body detection apparatus with high detection accuracy can be provided.

The figure which shows the moving body detection apparatus which concerns on one Embodiment of this invention. The figure which looked at FIG. 1 from the Z direction. FIG. 3 is a sectional view taken along line AA in FIG. 2. The figure which removed the 2nd housing from the moving body detection apparatus of FIG. The figure which shows the 2nd housing of FIG. The figure which shows the state before components attachment of FIG. (A) The principal part enlarged view around the 2nd protrusion part, (b) The principal part enlarged view around the 1st protrusion part. The figure which concerns on the 2nd housing of another embodiment of this invention.

Hereinafter, a mobile object detection apparatus according to an embodiment for carrying out the present invention will be described with reference to the drawings.
In the following description, based on the state of the moving body detection apparatus 100 shown in FIG. 1, the front-rear direction is the X direction, the left-right direction is the Y direction, and the up-down direction is the Z direction. In the following description, the direction in which the arrows indicating the X direction, the Y direction, and the Z direction are directed is the + (plus) direction, and the opposite direction is the-(minus) direction.
2 and 3, the moving body detection device 100 of the present invention includes a magnetic detection element 10 that outputs an electric signal according to the movement of the detection object D, and a magnet 20 that applies a magnetic field to the magnetic detection element 10. The lead terminal 30 connected to the magnetic detection element 10, the first housing 40 to which the magnetic detection element 10, the magnet 20 and the lead terminal 30 are attached on one side and the one side of the first housing 40 are covered. And a second housing 50 that is coupled and arranged to face the detection target. The first housing 40 is provided with a fixing portion 42 for fixing and mounting on the fixing object 70, and leads A part of the terminal 30 is embedded and integrated.

  The moving body detection device 100 is configured as, for example, a rotation detection device provided near the axle of the front wheel of a two-wheeled vehicle, and measures the vehicle speed from the detected number of rotations of the front wheel. That is, in the moving body detection device 100, the front wheel axle is the detected object, the vehicle body in the vicinity of the axle is the fixed object 70, and the fixed portion 42 of the first housing 40 is fixed to the fixed object 70. A second housing 50 fitted and connected to the housing 40 is disposed to face the axle.

  The magnetic detection element 10 includes a Hall IC that senses a change in a magnetic field accompanying the movement of a moving body D that is a detection target. The magnetic detection element 10 is provided such that a terminal 10b protrudes rearward (−X direction) at a right angle from the upper end of the detection unit 10a with respect to the detection unit 10a on the vertical surface (YZ plane) at the tip. The magnetic detection element 10 is accommodated in the accommodating portion 43 of the first housing 40. The accommodating portion 43 is formed integrally with the first housing 40 and is formed so as to protrude forward (+ X direction). The accommodating portion 43 is formed with a first recess 43a having an opening at the front central portion and opening upward (+ Z direction), and the detection portion 10a of the magnetic detection element 10 from above (+ Z direction) in the first recess 43a. Is disposed so that the front end surface (the end surface in the + X direction) of the detection unit 10a is positioned at the opening in the front central portion and faces the detection target.

  The magnet 20 is for applying a magnetic field to the magnetic detection element 10. The magnet 20 is composed of, for example, a ferrite magnet formed in a rectangular parallelepiped shape. The magnet 20 is housed from below in a second recess 43b provided in the rear (−X direction) adjacent to the first recess 43a in which the magnetic detection element 10 is accommodated and opened downward (−Z direction).

The lead terminal 30 is disposed in parallel with the upper surface of the housing portion 43 integrally formed with the first housing 40 and is embedded and integrated in the first housing 40 and the housing portion 43 by insert molding. Is connected to the terminal 10b of the magnetic detection element 10 by soldering or the like, and the end 30a (see FIG. 3) on the rear side is externally connected as a connector pin protruding into the connector 44 on the rear side of the first housing 40. Can be derived.
A substrate is provided between the front end of the lead terminal 30 and the terminal 10b of the magnetic detection element 10, and an electronic component such as an IC or a chip element for processing a detection signal of the magnetic detection element 10 is mounted. The output signal processing circuit is provided so that the output signal processed by the substrate processing circuit can be led out from the connector portion 44 via the lead terminal 30, or the detection signal from the magnetic detection element 10 is detected. Is output and processed by an external processing circuit.

  As shown in FIG. 4, the first housing 40 is formed concentrically at the center portion of the main body portion 41 having a substantially oval outer shape connecting two large and small arc portions and the small arc portion of the main body portion 41. The fixing part 42, the housing part 43 integrally formed by protruding forward (+ X direction) from the center of the large arc part of the main body part 41, and the rear part (−X direction) protruding from the large arc part of the main body part 41 And integrally formed connector portion 44, and is made of a synthetic resin such as a polybutylene terephthalate (PBT) resin. Note that the two arc portions may have the same size.

The fixing portion 42 is made of a metal and has a cylindrical collar 42 a and is integrated with a portion protruding below the main body portion 41 of the first housing 40. The fixed portion 42 is integrated by insert-molding a metal cylindrical collar 42 a in a small arc portion of the main body portion 41. As shown in FIG. 3, the first housing 40 can be fixed to the collar 42 a by inserting a fixing bolt from the rear (−X direction) and tightening it to the fixing object 70.
In the main body 41, a portion surrounded by an inner edge portion of the large arc portion and a semicircular portion on the large arc portion side of the collar 42a of the small arc portion is a side wall portion 41a, and an inner portion surrounded by the side wall portion 41a is The rear (−X direction) side is closed by a flat bottom plate portion 41 b which is a concave portion.

  The bottom plate portion 41 b is a contact surface in the X direction with the second housing 50. A first protrusion P1 is provided on the fixed plate 42 side of the bottom plate portion 41b, and a second protrusion P2 is provided on the opposite side of the fixed portion 42. The height H2 from the bottom plate portion 41b of the second projecting portion P2 is set higher (projected) than the height H1 from the bottom plate portion 41b of the first projecting portion P1. By fitting the first housing 40 and the second housing 50, the first and second projecting portions P <b> 1 and P <b> 2 are crushed, and a gap is hardly generated between the first housing 40 and the second housing 50. In addition, since the height H2 of the second protrusion P2 is higher than the height H1 of the first protrusion P1, the second protrusion P2 is the second protrusion P2 when the fixing object 70 and the fixing part 42 are tightened with the fixing bolt. It is easier to crush than 1 protrusion part P1. The lid plate portion 52b and the fixed object 70 are brought into contact with each other without a gap by the second projecting portion P2.

As shown in FIG. 3, the accommodating portion 43 projects forward from the front side of the bottom plate portion 41 b of the main body portion 41 through the cylindrical portion 43 c and is integrally molded with a synthetic resin in a substantially rectangular parallelepiped shape. An O-ring groove is formed on the outer peripheral portion of the cylindrical portion 43c and an O-ring 45 is mounted, and a sealing state is established between the cylindrical housing 43c and a second housing 50 to be fitted and connected.
As described above, the accommodating portion 43 is provided with the first concave portion 43a and the second concave portion 43b. The magnetic detecting element 10 is mounted on the first concave portion 43a, and the magnet 20 is mounted on the second concave portion 43b. Is done.

  The connector 44 has a hollow rectangular tube shape and is open at the rear (−X direction) and protrudes rearward from the bottom plate 41b of the main body 41, and is formed integrally with an external connector (see FIG. (Not shown) can be connected to each other in a predetermined direction, and the engagement and connection of the connectors can be held by the engagement irregularities.

As shown in FIGS. 1 and 5, the second housing 50 is fitted and connected so as to cover the housing portion 43 on one side (front side (+ X direction)) of the first housing 40, and is opposed to the detected object. The bottomed cylindrical portion 51 to be disposed and the flange portion 52 formed integrally with the opening end of the cylindrical portion 51 are formed. The second housing 50 is made of the same synthetic resin as the first housing 40, and is made of synthetic resin such as polybutylene terephthalate (PBT) resin.
In the second housing 50, the cylindrical portion 51 functions as a cover that covers the magnetic detection element 10, the magnet 20, and the like housed in the housing portion 43 formed integrally with the first housing 40. On the outer periphery, a plurality of reinforcing ribs 51a are integrally formed at equal intervals in the circumferential direction. The rib 51a increases the rigidity and reduces the influence of vibration from the fixed object 70. In addition, the rib 51 a has a function as an invitation when attaching the O-ring 53 and an invitation when attaching the moving body detection apparatus 100 to the fixed object 70. An O-ring groove 51 b is formed behind the rib 51 a of the cylindrical portion 51, and an O-ring 53 is attached to seal between the fixed object 70 and the first vibration of the fixed object 70 is caused by the O-ring 53. Transmission to the housing 40 is suppressed.
The flange portion 52 is formed in an outer shape along the inner shape of the side wall portion 41a of the first housing 40, and closes the side wall portion 52a surrounding the periphery and the opening on the front side of the side wall portion 52a, and is cylindrical. It is comprised with the cover plate part 52b in which the part 51 was provided integrally. A bottom surface 52 c of the side wall 52 a is a contact surface in the X direction with the first housing 40.
Accordingly, the second housing 50 is mounted and connected so as to cover the inside of the first housing 40, so that the flange portion 52 of the second housing 50 is provided inside the side wall portion 41 a of the first housing 40. The side wall portion 52a is fitted so as to be in contact with each other, the opening portion of the side wall portion 41a is closed by the cover plate portion 52b, and the flange portion 52 has the same thickness as the fixing portion 42 of the first housing 40. .
That is, when the height of the side wall portion 41a of the main body portion 41 of the first housing 40 and the height of the side wall portion 52a of the flange portion 52 of the second housing 50 are in the fitted connection state, the lid plate portion 52b is The thickness is set to be the same as that of the fixed portion 42 of the first housing 40.
Further, the flange portion 52 of the second housing 50 is sandwiched between the first housing 40 and the fixed object 70 when the first housing 40 is fixedly installed on the fixed object 70 by the fixing portion 42, and the moving body The detection device 100 can be reliably held on the fixed object 70.

Between the first housing 40 and the second housing 50, a connection holding mechanism 60 that holds the fitting connection state is provided.
In the first housing 40 on the fixed side fixed to the fixed object 70, four engagement recesses 61 are formed as substantially rectangular holes in the side wall 41a.
On the side wall 52a of the second housing 50, which is a coupling side to be fitted and connected to the first housing 40, there is an engaging convex portion 62 provided with a hook that engages with the engaging concave portion 61 from the inside to the outside. It is integrally formed.
Thus, the hook of the engaging convex portion 62 of the second housing 50 is connected to the first housing 40 by attaching the side wall portion 52a of the second housing 50 to the inner side of the side wall portion 41a of the first housing 40 and connecting them. The engagement and engagement state of the first housing 40 and the second housing 50 is held by the connection holding mechanism 60 by engaging with the hole of the engagement recess 61 of the housing 40.
Note that the engagement recess 61 and the engagement protrusion 62 may be reversely provided with the engagement protrusion 62 in the first housing 40 and the engagement recess 61 in the second housing 50.
Furthermore, in this moving body detection apparatus 100, when the first housing 40 is fixedly installed on the fixed object 70 via the fixing portion 42, the flange portion 52 of the second housing 50 that is fitted and connected to the first housing 40 is provided. The movable body detecting device 100 is securely held on the fixed object 70 even if a problem occurs in the fitting and connecting state by the connection holding mechanism 60, for example, between the first housing 40 and the fixed object 70. Can do.

As shown in FIG. 3, such a moving body detection device 100 has a second housing in a first housing 40 in which an O-ring 45 is attached to a cylindrical portion 43 c and the magnetic detection element 10 and the magnet 20 are accommodated in the accommodation portion 43. The housing 50 is covered and fitted and connected, and the engagement concave portion 61 and the engagement convex portion 62 of the connection holding mechanism 60 are engaged to hold the connection state. In addition, an O-ring 53 is mounted in the O-ring groove 51 b of the second housing 50.
Next, the moving body detection apparatus 100 is configured such that the second housing 50 is mounted in the mounting hole 71 facing the detection target (not shown) formed in the fixed object 70, and the collar 42 a of the fixing portion 42 of the first housing 40. The mounting bolts placed in are fixed to the fixing object 70 by fastening them. A connector for mounting is connected to the connector portion 44 from the outside so that a detection signal can be output to the outside.
As a result, the moving body detection device 100 is fixed to the fixed object 70 with the mounting bolt, and the detected body and the magnetic detection element 10 face each other, and the amount of movement of the detected body (such as the number of rotations) is the magnetic detection element 10. Is detected (measured).
When the moving body detection device 100 is, for example, a rotation detection device, the axle of the front wheel of the two-wheeled vehicle is the detected body, the vehicle body in the vicinity of the axle is the fixed object 70, and the first housing 40 is fixed to the fixed object 70. By fixing the fixing portion 42, the tip of the second housing 50 that is fitted and connected to the first housing 40 is disposed in the mounting hole 71 so as to face the axle. As a result, the rotational speed of the axle is measured from the magnetic change caused by the rotation of the axle of the two-wheeled vehicle that is to be detected, and the vehicle speed is calculated and output to the outside, or the rotational speed of the axle is detected and output. Is done.

In the moving body detection device 100, the housing portion 43 is integrally formed in the first housing 40 and the lead terminal 30 is embedded and integrated by insert molding, and the magnetic detection element 10 is housed in the first recess 43 a of the housing portion 43. Since the magnet 20 is accommodated in the second recess 43b and the first housing 40 is fixed to the fixed object 70 via the fixing portion 42, the vibration system of the detection object D and the moving object detection device 100 are The vibration system is the same.
Thus, in the apparatus so far, the second housing 50 is fixed to the fixed object 70 on the device side, and the first housing 40 is connected to the second housing 50, so that the vibration of the detected object is the first. The vibration is transmitted from the two vibration systems to the first housing 40 in which the magnetic detection element 10 and the magnet 20 are housed and fixed via the two housings 50, and the detection accuracy is lowered due to the influence of these vibrations. However, according to the moving body detection apparatus 100 of the present application, there is only one vibration system, and the detection can be performed with high accuracy while suppressing the influence of vibration.
In the conventional apparatus, the magnetic detection element 10 and the magnet 20 are accommodated in the second housing 50 and filled with resin to be cured. However, in the moving body detection apparatus 100 of the present application, fixing by filling with resin is performed. Is not required, and it is not necessary to provide a curing time, and can be produced efficiently in a short time.
In the moving body detection device 100, the second housing 50 is arranged and fitted and connected to the inside of the first housing 40, so that the second housing 50 can be made compact and reduced in size and weight. The influence of vibration can be suppressed by reducing the mass of the vibration system.
Further, since the second housing 50 is mounted in the mounting hole 71 of the fixed object 70 via the O-ring 53 mounted on the outer periphery of the O-ring groove 51b, the vibration from the fixed object 70 is mitigated by the O-ring 53. And a vibration reduction effect can be expected.

As described above in detail with the embodiment, according to the moving body detection device 100 of the present invention, the magnetic detection element 10 that outputs an electric signal according to the movement of the detected object, and the magnetic detection element 10 Magnet 20 for applying a magnetic field, lead terminal 30 connected to magnetic detection element 10, first housing 40 to which magnetic detection element 10, magnet 20 and lead terminal 30 are attached on one side, and first housing 40 A second housing 50 that is fitted and connected so as to cover one side of the first housing 50 and is disposed to face the detection target, and the first housing 40 has a fixing portion for fixing and fixing to the fixing object 70. 42 and a part of the lead terminal 30 is embedded and integrated, the vibration system of the fixed object 70 and the vibration system of the magnetic detection element 10 and the magnet 20 are the same, and different vibration systems. It can be detected with high accuracy by suppressing a reduction in detection accuracy due.
Further, since the magnetic detection element 10 and the magnet 20 are fixed to the first housing 40 fixed to the fixing object 70, it is necessary to fix the magnetic detection element 10 and the magnet 20 by filling the second housing 50 with resin and curing. No curing time is required, and production can be efficiently performed in a short time.

  According to the moving body detection apparatus 100 of the present invention, the second housing 50 is provided with the flange portion 52 that is sandwiched between the first housing 40 and the fixed object 70 when the fixing portion 42 is fixed. The second housing 50 can be securely fixed via the first housing 40. Thereby, even if the fitting connection of the 1st housing 40 and the 2nd housing 50 may be released by any chance, the fixed state to fixed object 70 can be maintained as it is.

  According to the moving body detection apparatus 100 of the present invention, the fixed portion 42 includes a metal-made cylindrical collar 42 a and is integrated with the first housing 40, and the flange portion 52 is provided around the fixed portion 42. Since it is formed at least in part, it can be securely fixed to the fixing object 70 by the metal collar 42a of the fixing portion 42, and the fixing portion 42 is fixed with the flange portion 52 interposed therebetween. Can be fixed more firmly and securely.

The present invention is not limited to the above-described embodiment.
For example, in the above-described embodiment, the case where the moving object detection device 100 is used as the rotation detection device to detect the object to be rotated is described as an example. It may be.

  The case where the magnetic detection element 10 is configured by a Hall IC has been described as an example. However, the magnetic detection element 10 is not limited to this and may be of any other type.

  The materials for the first housing 40, the second housing 50, and the like are not particularly limited, and commonly used synthetic resins can be used.

  The X, Y, and Z directions in the moving body detection device 100 are set for explanation, and the mounting direction and the like of the moving body detection device 100 are not limited to these directions.

  In the above-described embodiment, the case where the first and second protrusions are provided on the first housing side is illustrated. However, as shown in FIG. 8A, the first and second protrusions are provided on the second housing side. Similar effects can be expected by providing a structure in which one protrusion is provided on the first housing side and the other protrusion is provided on the second housing side as shown in FIG. 8B. Moreover, although embodiment which is the shape of different height was shown by the 1st protrusion part P1 and the 2nd protrusion part P2, it forms with different thickness and the ease (strength) of deformation | transformation by the stress from the outside is shown. It can also be configured differently.

DESCRIPTION OF SYMBOLS 100 Moving body detection apparatus 10 Magnetic detection element 10a Detection part 10b Terminal 20 Magnet 30 Lead terminal 30a Terminal 40 1st housing 41 Main body part 41a Side wall part 41b Bottom plate part (contact surface)
42 Fixing part 42a Collar 43 Housing part 43a 1st recessed part 43b 2nd recessed part 43c Cylindrical part 44 Connector part 45 O-ring 50 2nd housing 51 Cylindrical part 51a Rib 51 O-ring groove 52 Flange part 52a Side wall part 52 Cover plate part 52c Bottom (contact surface)
53 O-ring 60 Connection holding mechanism 61 Engaging recess 62 Engaging projection 70 Fixed object 71 Mounting hole D Moving object (detected object)
P1 1st protrusion P2 2nd protrusion H1 height H2 height

Claims (5)

A magnetic detection element that outputs an electrical signal corresponding to the movement of the detected object;
A magnet for applying a magnetic field to the magnetic sensing element;
A lead terminal connected to the magnetic detection element;
A first housing having an accommodating portion for accommodating the magnetic detection element, the magnet, and the lead terminal;
In a moving body detection device comprising: a second housing that is fitted and connected to the first housing so as to cover the housing portion and is disposed to face the detected body.
A fixing portion for fixedly installing the first housing on the fixing object;
A first protrusion on the fixed portion side of the contact surface of the first and second housings;
A second protrusion on the opposite side of the contact surface of the first and second housings from the fixed portion;
A moving body detection apparatus comprising: The moving body detection device according to claim 1, wherein the second protrusion is protruded from the first protrusion. The moving body detection apparatus according to claim 1, wherein the first protrusion and the second protrusion are provided in the first housing. The moving body detection apparatus according to claim 1, wherein the second housing includes the first protrusion and the second protrusion. The moving body detection device according to claim 1, wherein the first housing is provided with either the first protrusion or the second protrusion.

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