JP3070463B2 - Moving object detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object detector for detecting a moving state of a moving object such as a gear or a multi-pole magnetized magnet.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 2-264817 discloses a moving object detector for detecting a moving distance and a moving speed (moving state of a moving object performing a rotational movement). A lid disposed on the upper end of the resin case and having a flat surface to be detected, a magnetic transducer mounted on the inner surface of the lid, and fixedly holding the magnetic transducer in the resin case. The moving object detector is constituted by a filling material made of epoxy or the like.

[0003]

When measuring the vehicle speed or distance of a vehicle using such a moving object detector, it is general to detect the unevenness of the gear by using a transmission gear or the like as an object to be detected. It is. However, the transmission gear is composed of various gears such as a spur gear and a bevel gear, and the spur gear can relatively easily mount the above-described moving object detector. When detecting the uneven surface, the moving object detector must be attached so that the magnetic transducer is substantially parallel to and close to the uneven surface. There was a problem that it was not possible. To solve these problems,
The above-mentioned problem can be solved by forming the lid of the resin case so as to conform to the shape of the bevel gear (a shape substantially parallel to the uneven surface), but the lid is inclined by the bevel gear. To form a resin case to fit
It is difficult to dispose the magnetic transducer arranged on the inner surface side of the lid at an appropriate position, and the location of the magnetic transducer becomes uneven. There was a problem that variation occurred. Therefore, the present invention solves the above-described problem by moving the magnetic transducer so that the magnetic transducer can be disposed at an appropriate position of the resin case even when the detected object has a different shape such as a spur gear or a bevel gear. An object detector is provided.

[0004]

According to the present invention, there is provided a magnetic transducer, a resin case for accommodating the magnetic transducer, and a circuit board on which the magnetic transducer is mounted. When provided with a magnet 4 which gives a magnetic field to the magnetic conversion element 2, and a magnet holder 5 for disposed on the circuit board 3 has a recess 54 for mounting the magnet 4, the magnetic
The stone holder 5 is placed on the circuit board 3 for mounting.
End face with at least two different angles to face 51
52, 53, and the front faces 52, 53
This is provided with a concave portion 54 in which the magnet 4 is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnet for applying a magnetic field to a magnetic transducer.
Is mounted on the circuit board with at least two or more different recesses , so that even if the shape of the detection surface of the detection target is different,
Since components other than the resin case can be shared, cost reduction can be achieved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

The moving object detector of the present invention is shown in FIGS.
As shown in FIG. 1, a substantially cylindrical resin case 1 and a Hall IC
And a circuit board 3 on which an electronic component (not shown) including a capacitor or the like for preventing the magnetic conversion element 2 from noise and the like is mounted, and a magnet 4 for applying a magnetic field to the magnetic conversion element 2. Then, a magnet holder 5 provided on the circuit board 3, a board holder 6 holding the circuit board 3, and a filler 7 made of epoxy or the like for fixing the magnetic transducer 2 in the resin case 1 are formed. It is configured.

The resin case 1 has, for example, a mounting piece 11 for mounting and fixing to a cover body (not shown) of a transmission or the like with screws or the like, and a circuit board to be described later in detail on the inner wall of the resin case 1. A guide wall (guide portion) 12 for guiding and supporting 3 to the bottom of the resin case 1 is formed to a predetermined position, and the mounting piece 11 and the guide wall 12 are formed integrally with the resin case 1. Such a resin case 1 has a detection surface (bottom surface) 13 corresponding to the shape of the object to be detected, and the thickness of the detection surface 13 is formed to be thinner than the thickness of the cylindrical side surface. ing. Further, the detection surface 13 has a shape different depending on whether the shape of the object to be detected is, for example, a spur gear or a bevel gear (the angle of the detection surface 13 is changed according to the detection angle). Resin case 1 having detection surface 13 shown in FIGS. 1 and 2
Is used, for example, when detecting a spur gear as a detection target.

As shown in FIG. 3, the circuit board 3 electrically connects an electric cord 8 for power supplied from outside and an electric cord 8 for output of the magnetic transducer 2 to a land (not shown) by soldering. Cord insertion hole 31 (a land is formed on the back surface) and a substrate holder 6 described later in detail.
And a notch portion 32 for positioning when disposing. In addition, the circuit board 3 determines a position where the circuit board 3 is disposed with respect to the resin case 1 and a first contact portion 33 for determining a position when the magnet holder 5 to be described in detail later is disposed. Therefore, a second contact portion 34 that contacts the terminal end of the guide wall 12 of the resin case 1 is formed.

As shown in FIGS. 4 and 5, the magnet holder 5 is made of a resin material and has a substantially semi-cylindrical shape having a mounting surface 51 that is substantially horizontal with respect to the circuit board 3. One end surface (magnet mounting surface) 52 of the magnet holder 5 is a mounting surface 51.
And a substantially vertical surface, and the other end surface (magnet mounting surface)
53 is formed to be an inclined surface having a predetermined angle with respect to the mounting surface 51. Each of the end faces 52 and 53 has a recess 54 for disposing the magnet 4. Above the recess 54, when the magnetic transducer 2 is disposed, the end faces 52 and 53 and the magnetic conversion The detection surface of the element 2 is substantially flush with the detection surface of the magnetic conversion element 2, and a step portion 55 is formed to abut the detection surface 13 of the resin case 1. Positioning unit 56 for determining the arrangement position of conversion element 2
Are formed. On the other hand, a pair of arm pieces 57 having a substantially L-shaped cross section are formed integrally with the main body from the mounting surface 51 of the magnet holder 5 downward, and the circuit board 3 is inserted into the pair of arm pieces 57. By placing the magnet holder 5 on the circuit board 3, the side surface of each arm 57 is brought into contact with the first contact portion 33 of the circuit board 3, whereby the circuit board 3
The position of the magnet holder 5 with respect to is determined.

When the object to be detected is, for example, a spur gear, the magnet holder 5 having the respective end surfaces 52, 53 is provided on the mounting surface 51.
So that one end face 52 side of a substantially vertical surface in pairs (shown in FIG. 5 (a)), also detected body, for example in the case of a bevel gear, inclined to the mounting surface 51 The other end face that will be the surface
It is detachable from the circuit board 3 so that the 53 side ((b) shown in FIG. 5) is on the detection surface 13 side of the resin case 1. However, the other end surface 53 described above is an inclined surface having a predetermined angle.
Must approximately match the angle of

As shown in FIGS. 6 and 7, the board holder 6 is soldered to the above-mentioned electric cord 8 by being pulled upward (soldered to a land (not shown) of the circuit board 8). In which the electric cord 8 is bent with respect to the substrate holder 6 in consideration of the stress of
61, and a pair of receiving pieces 62 for supporting the circuit board 3 from below.
Has 63. The circuit board 3 is mounted on the board holder 6.
And a pressing portion 65 for pressing the circuit board 3 from above when filling with a filler in a later-described manufacturing process.
1, 62, 63, 64 and 65 are integrally formed.

When the above-mentioned substrate holder 6 is disposed on the circuit board 3, the support pieces of the substrate holder 6 are provided by the circuit board 3.
The circuit board 3 is arranged so that the notch 32 of the circuit board 3 fits into the projection 63 of the receiving piece 62 of the board holder 6 while lifting the board 64 upward.

As a method for manufacturing the moving object detector having such a configuration, the magnet 4 is disposed in the concave portion 54 of the magnet holder 5 and then the positioning portion formed on the step 55 of the magnet holder 5 is formed.
The magnetic conversion element 2 is arranged on 56, and the leads of the magnetic conversion element 2 (leads electrically connected to the circuit board 3) are connected to the circuit board 3
Homing in the direction. Thereafter, the circuit board 3 is inserted until the first contact portion 33 formed on the circuit board 3 on which electronic components and the like are mounted contacts the measuring ends of the pair of arm pieces 57 of the magnet holder 5, and the magnetic conversion is performed. The leads of the element 2 are soldered to lands (not shown) formed on the back surface of the circuit board 3.

Then, the electric cord 8 is inserted through the cord insertion hole 31 of the circuit board 3, and the electric cord 8 is soldered to a land on the back surface of the circuit board 3. The cutout 32 of the circuit board 3 is arranged so as to fit into the projection 63, and the electric cord is routed along the routing path 61 of the board holder 5. And the circuit board 3
Along the guide wall 12 formed in the resin case 1,
These are stored in the resin case 1. Thereafter, the pressing portion 65 formed on the substrate holder 6 is pressed with an appropriate pressure by a dedicated jig to temporarily fix the position of the magnetic transducer 2 mounted on the circuit board 3 with respect to the resin case 1. And
The position of the magnetic transducer 2 with respect to the resin case 1 is fixed by filling the resin case 1 with the filler 7. Thus, the moving object detector is completed.

Since the moving object detector having such a configuration includes the resin case 1 and the magnet holder 5 and the substrate holder 6 corresponding to the shape of the object to be detected, variations occur in the lead homing of the magnetic transducer 2, Even if the magnetic transducer 2 is lifted up from the positioning portion 56 formed on the step portion 55, the circuit board 3 is detected by applying a predetermined pressing force to the pressing portion 65 of the substrate holder 6 to detect the resin case 1. surface
13, the end surface 52 (5
3) and the detection surface 13 of the resin case 1 are formed in a substantially parallel state.
It is arranged on the positioning part 56 formed in the step part 55 of the magnet holder 5 along the inside of the magnet holder 5. Since the disposition of the magnetic transducer 2 does not vary, the detected object can be accurately detected. Can be measured. In addition, electric cord 8
In consideration of the stress on the soldering point between the circuit board 3 and
By forming the wiring path 61 of the electric cord 8 in the substrate holder 6, the reliability of the electric connection is improved.

Further, a pressing pressure exceeding a predetermined level is applied to the substrate holder 6.
When the second contact portion 34 is formed on the circuit board 3 even when it is applied to the pressing portion 65 of the
At the end of the guide wall 12 formed to a predetermined position in the 13 direction, a second
The contact portion 34 of the magnetic transducer 2 comes into contact, and the proper position of the magnetic transducer 2 is determined at this contact position. To prevent damage.

Further, since the magnet holder 5 can be attached to and detached from the circuit board 3, even if the shape of the object to be detected is different, the components of the moving object detector other than the resin case 1 (magnetic conversion element) 2, circuit board 3, magnet 4, magnet holder 5, board holder 6) can be shared,
Cost reductions can be achieved.

In this embodiment, the contact portion 34 with the resin case 1 is formed on the circuit board 3.
May be provided with a contact portion.

Further, the magnet holder 5 of this embodiment has a mounting surface.
Although the end surfaces 52 and 53 having two different angles with respect to the mounting surface 51 are provided, for example, the mounting surface 51 has four angles and the circuit board 3 can be inserted from four directions. You may do it.

In the embodiment of the present invention, the pressing portion
The circuit board 3 is pressed against the detection surface 13 of the resin case 1 by using the substrate holder 6 on which the substrate 65 is formed. However, it is not always necessary to use the substrate holder 6. By pressing the end of the circuit board 3, the arrangement position of the magnetic transducer 2 with respect to the resin case 1 may be determined.

In the present embodiment, the magnetic transducer 2 is fixed by filling the resin case 1 with the filler 7, but the present invention is not limited to the above-described embodiment. Alternatively, the circuit board 3 may be press-fitted into a guide wall formed in the resin case 1 to fix the arrangement position of the magnetic transducer 2.

[0023]

The present invention provides a magnetic transducer, a resin case accommodating the magnetic transducer, a circuit board on which the magnetic transducer is mounted, a magnet for applying a magnetic field to the magnetic transducer, and the magnet. And a magnet holder disposed on the circuit board , wherein the magnet holder is disposed on the circuit board.
At least two different angles to the mounting surface for mounting
And having the magnet on the end face.
A concave portion to be provided is provided, and even when the detection shapes of the detection target are different, the components can be shared, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment.

FIG. 3 is a diagram showing a circuit board of the embodiment.

FIG. 4 is a sectional view of a main part of the magnet holder of the embodiment.

FIG. 5 is a view showing a magnet holder according to the embodiment.

FIG. 6 is a view showing a substrate holder of the embodiment.

FIG. 7 is an essential part cross-sectional view of the substrate holder of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin case 12 Guide wall 13 Detection surface 2 Magnetic conversion element 3 Circuit board 33 First contact part 34 Second contact part 4 Magnet 5 Magnet holder 51 Placement surfaces 52, 53 End surface 54 Depression 55 Step 56 Positioning Part 57 arm piece 6 board holder 61 routing path 62 receiving piece 63 protrusion 64 support piece 65 pressing part 7 filler

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B ^7/ 00-7/34

Claims (1)

(57) [Claims] 1. A magnetic transducer, a resin case accommodating the magnetic transducer, a circuit board on which the magnetic transducer is mounted, a magnet for applying a magnetic field to the magnetic transducer, and the magnet mounted on the circuit board. And a magnet holder to be
The magnet holder is provided on the circuit board.
With at least two different angles to the mounting surface of the
And a recess for arranging the magnet on the end face.
A moving object detection device characterized by comprising a unit.