JP7157906B2 - Moving body detection device and method for manufacturing moving body detection device - Google Patents

Description

The present invention relates to a moving body detection device using a magnetic detection element and a manufacturing method of the moving body detection device.

2. Description of the Related Art A moving body detection device is used to detect the movement of a moving body that moves linearly or rotationally. For example, in a moving body detection device (rotation detection device) disclosed in Patent Document 1, lead terminals are insert-molded in a middle case.

JP 2008-164439 A

In the moving object detection device disclosed in Patent Document 1, in the process of insert-molding the lead terminals into the middle case, if the positions of the lead terminals are displaced due to resin molding pressure or the like, the distance between the plurality of lead terminals is defined. As described above, there is a possibility that defective products may be produced, such as troubles in connection with the magnetic detecting element or lead terminals coming into contact with each other and short-circuiting inside the middle case.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a moving body detection device with high production efficiency and a method for manufacturing the moving body detection device.

The moving body detection device 100 of the present invention is
a magnetic detection element 10 that outputs an electric signal corresponding to the movement of the object D to be detected;
a magnet 20 that applies 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 housing portion 43 housing the magnetic detection element 10, the magnet 20 and the lead terminal 30;
a second housing 50 that covers the housing portion 43, is fitted and connected to the first housing 40, and is arranged to face the detected object D;
projecting portions 31c and 32c on the outer peripheral direction side of the accommodating portion 43 at the ends of the lead terminals 30 on the side of the magnetic detecting element 10;
A concave portion R is provided on the surface of the housing portion 43 on the lead terminal 30 side,
The concave portion R is characterized in that it is formed at a position facing the projecting portions 31c and 32c.

The manufacturing method of the moving body detection device 100 of the present invention includes:
a magnetic detection element 10 that outputs an electric signal corresponding to the movement of the object D to be detected;
a magnet 20 that applies 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 housing portion 43 housing the magnetic detection element 10, the magnet 20 and the lead terminal 30;
A method for manufacturing a moving object detection device 100 including a second housing 50 that covers an accommodating portion 43, is fitted and connected to the first housing 40, and is arranged to face an object D to be detected,
a step of providing projecting portions 31c and 32c on the outer peripheral direction side of the accommodating portion 43 at the end portion of the lead terminal 30 on the magnetic detecting element 10 side;
a step of providing recesses R at positions facing the projections 31c and 32c on the surface of the housing portion 43 on the lead terminal 30 side;
It is a manufacturing method of the moving body detection device 100 characterized by comprising.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the mobile body detection apparatus and mobile body detection apparatus with high production efficiency can be provided.

1 is a diagram showing a moving body detection device according to an embodiment of the present invention; FIG. The figure which looked at FIG. 1 from the downward direction (-Z direction). FIG. 3 is a cross-sectional view along the line AA of FIG. 2; The figure which removed the 2nd housing from the moving body detection apparatus of FIG. The figure which shows a lead terminal. The figure which looked at the 1st housing of FIG. 4 from upper direction (+Z direction). The figure which shows the positional relationship of a recessed part and a lead terminal. FIG. 2 shows the second housing of FIG. 1;

A mobile body detection device according to an embodiment for carrying out the present invention will be described below with reference to the drawings.
In the following description, 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, based on the state of the moving object detection apparatus 100 shown in FIG. Also, the direction in which the arrows indicating the X direction, Y direction, and Z direction point is the + (plus) direction, and the opposite direction is the - (minus) direction.
As shown in FIGS. 2 and 3, the moving body detection device 100 of the present invention includes a magnetic detection element 10 that outputs an electric signal corresponding to the movement of a detection target D, and a magnet 20 that applies a magnetic field to the magnetic detection element 10. a lead terminal 30 connected to the magnetic detection element 10; a first housing 40 to which the magnetic detection element 10, the magnet 20 and the lead terminal 30 are attached on one side; and a second housing 50 that is coupled and arranged to face the object to be detected. A part of the terminal 30 is embedded and integrated.

The moving object 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 rotation speed of the front wheel. That is, in the moving object detection device 100, the axle of the front wheel is the detected object D, the vehicle body near the axle is the fixed object 70, the fixed part 42 of the first housing 40 is fixed to the fixed object 70, and the first housing 40 is fixed to the fixed object 70. A second housing 50 that is fitted and connected to the housing 40 of the vehicle is disposed opposite the axle.

The magnetic detection element 10 is composed of a Hall IC or the like that senses changes in the magnetic field associated with the movement (rotation) of the moving body D, which is an object to be detected. The magnetic detection element 10 is provided with a terminal 10b protruding rearward (-X direction) at a right angle from the upper end of the detection portion 10a with respect to the detection portion (detection surface) 10a on the vertical plane (YZ plane) of the tip. there is The magnetic detection element 10 is housed in the housing portion 43 of the first housing 40 . The accommodating portion 43 is formed integrally with the first housing 40 and protrudes forward (+X direction). As shown in FIG. 4, the accommodation portion 43 is formed with a first concave portion 43a that is open near the center on the front side and is open upward (+Z direction). The detection part 10a of the detection element 10 is accommodated, and the tip end face (the end face in the +X direction) of the detection part 10a is positioned in the opening near the center on the front side and arranged to face the object to be detected.

The magnet 20 is for applying a magnetic field to the magnetic detection element 10 . The magnet 20 is composed of, for example, a rectangular parallelepiped ferrite magnet. As shown in FIG. 3, the magnet 20 is placed downward 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). has been accommodated from

The lead terminal 30 consists of leads 31 and 32, as shown in FIG. As shown in FIGS. 3 and 5, the leads 31 and 32 are exposed from rear end portions 31a and 32a exposed from a connector portion 44 to be described later, and from near the middle between the housing portion 43 and the connector portion 44, and are magnetically connected. Terminal connection portions 31b and 32b electrically connected to the terminals 10b of the detection element 10, and projecting portions 31c and 32c at the ends opposite to the ends 31a and 32a (in the direction of the detection portion 10a). . The protrusions 31c and 32c are provided on one side of the leads 31 and 32, respectively. The ends 31a and 32a of the leads 31 and 32 are supported parallel to each other by a mold or a jig (not shown) so that the protruding portions 31c and 32c are oriented outward with respect to the two leads 31 and 32. It is arranged in parallel with the upper surface of the accommodating portion 43 integrally molded with the housing 40 and embedded and integrated with the first housing 40 and the accommodating portion 43 by insert molding (see FIG. 6). At this time, the positions of the lead terminal 30 between the projecting portions 31c and 32c in the tip (+X) direction and the left and right (Y) direction are regulated by a mold or a jig (not shown), thereby preventing contact between the leads 31 and 32. In addition, a concave portion R is formed in the accommodating portion 43 . The recess R is a trace of a mold (not shown). FIG. 7 shows the positional relationship between the recess R and the protrusions 31c and 32c. The recess R is formed at a position facing the projecting portions 31c and 32c. The length of the recess R in the Y direction is shorter than the length of the protrusions 31c and 32c in the Y direction. Since the length of the recess R in the Y direction is shorter than the length between the protrusions 31c and 32c, the leads 31 and 32 do not come into contact with each other even if the position of the mold (not shown) varies. Further, when resin molding pressure is applied and the leads 31 and 32 are displaced, the +X direction inner surfaces of the projecting portions 31c and 32c contact a mold (not shown) so that the leads 31 and 32 do not come into contact with each other. The concave portion R is formed parallel to the detection portion 10a. The terminal connection portions 31b and 32b of the leads 31 and 32 are electrically connected to the terminals 10b and 10b of the magnetic detection element 10 by resistance welding, respectively, and the rear ends 31a and 32a are connected to the connectors behind the first housing 40. A detection signal can be led out to the outside as a connector pin projecting into the portion 44 .

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

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

The bottom plate portion 41b is a contact surface with the second housing 50 in the X direction. The bottom plate portion 41 b contacts the flange portion 52 of the second housing 50 .

The accommodating portion 43 is made of synthetic resin and has a cylindrical portion 43c as shown in FIG. An O-ring groove is formed in the outer peripheral portion of the columnar portion 43c, and an O-ring 45 is mounted thereon to seal with a second housing 50 to be fitted and connected, which will be described later.
The terminal connection portions 31b and 32b are exposed from the middle (near the center) of the housing portion 43 in the longitudinal (X) direction. A recess R is formed between the terminal connection portions 31b and 32b.
As already described, the accommodation portion 43 is provided with the first recess 43a and the second recess 43b. A magnet 20 is attached to each.

The connector portion 44 has a hollow rectangular tubular shape and is open at the rear (-X direction), and is formed integrally with the bottom plate portion 41b of the main body portion 41 so as to protrude rearward. (not shown)) can be connected in a predetermined direction, and the locking concave/convex portion can maintain the locked and connected state of the connectors.

As shown in FIGS. 1 and 8, the second housing 50 covers the housing portion 43 (see FIG. 3) on one side (front side (+X direction)) of the first housing 40 and is fitted and connected. It is formed with a bottomed cylindrical portion 51 arranged to face the body D (see FIG. 2) and a flange portion 52 integrally formed at the open end of the cylindrical portion 51 . The second housing 50 is made of the same synthetic resin as the first housing 40, such as polybutylene terephthalate (PBT) resin.
In the second housing 50, the cylindrical portion 51 functions as a cover for covering the magnetic detecting element 10 and the magnet 20, which are housed in the housing portion 43 integrally formed with the first housing 40. A plurality of reinforcing ribs 51a are integrally formed on the outer periphery at equal intervals in the circumferential direction. The ribs 51 a increase the rigidity and reduce the influence of vibrations from the fixed object 70 . Further, the rib 51 a has a function of guiding when attaching the O-ring 53 and of guiding when attaching the moving object detection device 100 to the fixed object 70 . An O-ring groove 51b is formed in the rear portion of the rib 51a of the cylindrical portion 51, and an O-ring 53 is mounted thereon to seal with the fixed object 70. transmission to the housing 40 is suppressed.
The flange portion 52 is formed in an outer shape that follows the inner shape of the side wall portion 41a of the first housing 40, closes the surrounding side wall portion 52a and the front opening of the side wall portion 52a, and is cylindrical. It is composed of a cover plate portion 52b integrally provided with the portion 51. As shown in FIG. A bottom surface 52c of the side wall portion 52a is a contact surface with the first housing 40 in the X direction.
As a result, the flange portion 52 of the second housing 50 is mounted inside the side wall portion 41 a of the first housing 40 by connecting the second housing 50 so as to cover the inside of the first housing 40 . The opening 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 cover plate portion 52b is It is set to have the same thickness as 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 fixed to the fixed object 70 (see FIG. 3) by the fixing portion 42. As a result, the moving object detection device 100 can be reliably held on the fixed object 70 .

Between the first housing 40 and the second housing 50, as shown in FIGS. 4 and 8, a connection holding mechanism 60 is provided to hold the fitted connection state.
Four engaging recesses 61 are formed as substantially rectangular holes in the side wall portion 41a of the first housing 40, which is the fixed side to be fixed to the object to be fixed 70. As shown in FIG.
On the side wall 52a of the second housing 50 that is to be fitted and connected to the first housing 40, there is an engagement projection 62 having a hook that engages the engagement recess 61 from the inside to the outside. integrally formed.
Accordingly, by attaching and connecting 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, the hook of the engaging convex portion 62 of the second housing 50 is connected to the first housing. The fitting and connection 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 .
The engagement recess 61 and the engagement protrusion 62 may be reversed by providing the engagement protrusion 62 on the first housing 40 and providing the engagement recess 61 on the second housing 50 .
Furthermore, in this moving body detection device 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 fitted and connected to the first housing 40 is To ensure that the moving object detection device 100 is held by the fixed object 70 even if a problem arises in the fitting connection state of the connection holding mechanism 60 due to being sandwiched between the first housing 40 and the fixed object 70 . can be done.

As shown in FIG. 3, such a moving object detection device 100 includes a first housing 40 in which an O-ring 45 is attached to a columnar portion 43c, and a magnetic detecting element 10 and a magnet 20 are accommodated in an accommodating portion 43. are fitted and connected so as to cover the housing 50, and the engaging concave portion 61 and the engaging convex portion 62 of the connection holding mechanism 60 are engaged to maintain the connected state. Also, the O-ring 53 is attached to the O-ring groove 51b of the second housing 50. As shown in FIG.
Next, the second housing 50 is attached to the mounting hole 71 formed in the fixed object 70 facing the object D to be detected, and the collar 42a of the fixed portion 42 of the first housing 40 is attached. Fix by tightening the inserted mounting bolt to the fixed object 70.例文帳に追加A connector for attachment 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 object detection device 100 is fixed to the fixed object 70 by the mounting bolts, the object to be detected D and the magnetic detection element 10 face each other, and the amount of movement of the object to be detected (such as the number of rotations) is detected by the magnetic detection element. 10 is detected (measured).
For example, when the moving object detection device 100 is a rotation detection device, the axle of the front wheel of a two-wheeled vehicle is the detected object D, the vehicle body near the axle is the fixed object 70, and the fixed object 70 is the first housing. By fixing the fixing portion 42 of 40 , the tip of the second housing 50 fitted and connected to the first housing 40 is arranged in the mounting hole 71 so as to face the axle. As a result, the number of rotations of the axle is measured from the magnetic change caused by the rotation of the axle of the two-wheeled vehicle, which is the detected object D, and the vehicle speed is calculated and output to the outside, or the number of rotations of the axle is detected. output.

In the moving object detection device 100, the accommodating portion 43 is formed integrally with the first housing 40, and the lead terminals 30 are embedded and integrated by insert molding. Since the magnet 20 is accommodated in the second concave portion 43b and the first housing 40 is fixed to the fixed object 70 via the fixing portion 42, the vibration system of the object to be detected D and the moving object detection device 100 The vibration system becomes the same.
As a result, in the conventional apparatus, the second housing 50 is fixed to the fixed object 70 on the equipment side, and the first housing 40 is connected to the second housing 50, so that the vibration of the object to be detected is 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 second housing 50, and the influence of these vibrations causes a decrease in detection accuracy. However, according to the moving object detection device 100 of the present invention, the vibration system is made into one, and the influence of vibration can be suppressed and detection can be performed with high accuracy.
In the moving object detection device 100, the second housing 50 is arranged inside the first housing 40 and is fitted and connected. The influence of vibration can be suppressed by reducing the mass of the vibration system.
In addition, since the second housing 50 is attached to the mounting hole 71 of the fixed object 70 via the O-ring 53 attached to the outer periphery of the O-ring groove 51b, vibration from the fixed object 70 is alleviated by the O-ring 53. It is possible to expect a vibration reduction effect.

As specifically described above together with the embodiments, according to the moving object detection device 100 of the present invention, the magnetic detection element 10 that outputs an electric signal corresponding to the movement of the object to be detected, and the magnetic detection element 10 a magnet 20 for applying a magnetic field to the magnet, a lead terminal 30 connected to the magnetic detection element 10, a first housing 40 to which the magnetic detection element 10, the magnet 20 and the lead terminal 30 are attached to one side, and a first housing 40 and a second housing 50 that is fitted and connected to cover one side of the detection object and arranged to face the object to be detected. 42 is provided and a part of the lead terminal 30 is embedded and integrated, so that 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 detection is performed by different vibration systems. It is possible to detect with high accuracy while suppressing deterioration in accuracy.
Further, since the magnetic detection element 10 and the magnet 20 are fixed to the first housing 40 fixed to the fixed object 70, it is necessary to fill the second housing 50 with resin and harden it to fix the magnetic detection element 10 and the magnet 20. This eliminates the need for curing time and enables efficient production in a short period of time.

According to the moving object detection device 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 fixed by the fixing portion 42 . , the second housing 50 can be reliably fixed via the first housing 40 . Accordingly, even if the fitting connection between the first housing 40 and the second housing 50 should be released, the fixed state to the fixed object 70 can be maintained as it is.

According to the moving object detection device 100 of the present invention, the fixed portion 42 is provided with a cylindrical collar 42 a made of metal, and is integrated with the first housing 40 . Since it is formed at least partially, it can be reliably fixed to the object to be fixed 70 by the metal collar 42a of the fixed part 42, and the flange part 52 can be sandwiched and fixed as the fixed part 42 is fixed. can be fixed more firmly and reliably.

The leads 31 and 32 are supported in parallel at the end portions 31a and 32a using a mold and a jig, and the ends of the leads 31 and 32 ( By restricting the position in the +X) direction, when the lead terminal 30 is insert-molded in the first housing 40, it is possible to suppress positional deviation of the lead terminal 30 due to resin molding pressure or the like. In other words, the distance between the leads 31 and 32 may exceed the specified value, which may interfere with the connection with the magnetic sensing element 10, or the leads 31 and 32 may come into contact with each other, causing a short circuit inside the first housing 40, resulting in defective products. can be suppressed. Therefore, it is possible to provide a moving object detection device with high production efficiency.

An example of a method for manufacturing the moving object detection device 100 will be briefly described.

1) Using a mold and a jig (not shown), the leads 31 and 32 are formed so as to have terminal connection portions 31b and 32b and projecting portions 31c and 32c.
2) insert molding the leads 31 and 32 and the collar 42a into the first housing 40; At this time, the leads 31 and 32 are supported in parallel using a mold and a jig (not shown), and the protruding portions 31c and 32c are regulated by a mold and jig (not shown), so that the lead terminal 30 side of the housing portion 43 is A recess R is formed in the surface. By fixing the ends 31a and 32a with a mold or a jig and restricting the protruding portions 31c and 32c, it is possible to suppress positional displacement of the lead terminal 30 due to molding pressure of the resin, etc., and the leads 31 and 32 are parallel to each other. It is formed while maintaining the
3) The magnetic detecting element 10 is fixed to the first concave portion 43a, and the magnet 20 is fixed to the second concave portion 43b by a method such as adhesion.
4) The terminal 10b of the magnetic sensing element 10 and the terminal connection portions 31b and 32b are resistance-welded.
5) Attach the O-ring 45 to the housing portion 43 .
6) After fitting the second housing 50 and the first housing 40 together, the O-ring 53 is fitted, or after fitting the O-ring 53 to the second housing 50, the second housing 50 and the first housing 50 are fitted together. The housing 40 is fitted.

The invention is in no way limited to the embodiments described above.
For example, in the above-described embodiment, the mobile object detection device 100 is used as a rotation detection device to detect an object rotating in motion. can be

Although the magnetism detecting element 10 has been described as an example in which it is configured by a Hall IC, it is not limited to this and may be of any other type.

Although the case where the leads 31 and 32 have different shapes has been described as an example, leads of the same shape may be arranged symmetrically.

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

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

INDUSTRIAL APPLICABILITY The present invention can be used for a moving body (rotation) detection device that detects rotation of an axle of a two-wheeled vehicle using a magnetic detection element, and a manufacturing method for the moving body (rotation) detection device.

REFERENCE SIGNS LIST 100 moving body detection device 10 magnetic detection element 10a detection unit (detection surface)
10b terminal 20 magnet 30 lead terminal 31 lead 31a end 31b terminal connection portion 32 lead 32a end 32b terminal connection portion 40 first housing 41 body portion 41a side wall portion 41b bottom plate portion (contact surface)
42 fixing portion 42a collar 43 accommodating portion 43a first recess 43b second recess 43c cylindrical portion 44 connector portion 45 O-ring 50 second housing 51 cylindrical portion 51a rib 51b O-ring groove 52 flange portion 52a side wall portion 52b cover plate portion 52c Bottom (contact surface)
53 O-ring 60 Connection holding mechanism 61 Engaging concave portion 62 Engaging convex portion 70 Fixed object 71 Mounting hole D Moving body (object to be detected)
R recess

Claims (2)

a magnetic detection element that outputs an electric signal according to the movement of the object to be detected;
a magnet that applies a magnetic field to the magnetic detection element;
a lead terminal consisting of two leads connected to the magnetic detection element;
a first housing having an accommodating portion that accommodates the magnetic detection element, the magnet, and the lead terminals;
A moving object detection device comprising: a second housing that covers the accommodating portion, is fitted and connected to the first housing, and is arranged to face the object to be detected,
a terminal connection portion of the lead, which is connected to the magnetic detection element, is exposed from the accommodating portion;
The lead has a projecting portion on the side of the magnetic detecting element of the terminal connection portion,
The accommodating portion has a concave portion on a surface on the lead terminal side ,
The moving body detection device, wherein the concave portion is formed at a position facing the projecting portion of the two leads . a magnetic detection element that outputs an electric signal according to the movement of the object to be detected;
a magnet that applies a magnetic field to the magnetic detection element;
a lead terminal consisting of two leads connected to the magnetic detection element;
a first housing having an accommodating portion that accommodates the magnetic detection element, the magnet, and the lead terminal;
A method for manufacturing a moving object detection device comprising: a second housing that covers the accommodating portion, is fitted and connected to the first housing, and is arranged to face the object to be detected,
a step of forming the lead so as to include a terminal connection portion connected to the magnetic detection element, and a protruding portion of the terminal connection portion on the side of the magnetic detection element;
The accommodation unit is
a) exposing the terminal connection portion of the lead;
b) a concave portion is provided on the lead terminal side surface of the accommodating portion;
c) the recess is formed at a position facing the protrusion of the two leads;
and
A method for manufacturing a moving body detection device, comprising:

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