JP4203796B2 - Rotation sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation sensor in which a sensor element for detecting rotation is provided inside a sensor body.
[0002]
[Prior art]
As a rotation sensor S used in a conventional vehicle, for example, as shown in FIG. 4, circuit components such as a magnetic detection element 22 such as a Hall IC, a bias magnet 23, a capacitor 24, and a resistor 25 are mounted on a resin base 21. There are some (see, for example, Patent Document 1).
[0003]
Among these components, in particular, the capacitor 24 and the resistor 25 are often provided in order to improve the surge resistance of the rotation sensor. Surge resistance refers to a characteristic that protects against a large voltage applied to the rotation sensor, for example, at the moment when the vehicle engine is turned off or when the battery terminal is disconnected for some reason.
[0004]
In the conventional rotation sensor S, as described above, the resistor 25 and the like are provided in order to improve surge resistance. These electronic components are, for example, soldered to a wiring pattern formed on the resin base 21, and further molded with a resin 26 so that the resistor 25 and the like are mounted on an insert molded substrate or a three-dimensional substrate. The rotation sensor S can be obtained.
[0005]
In general, when a control circuit including the rotation sensor or the like is configured, a protection circuit is often provided in advance near the CPU of the control circuit, for example, in consideration of the occurrence of the surge. Therefore, when the rotation sensor is installed in the vicinity of the protection circuit, the above protection circuit may not be particularly provided.
[0006]
However, when the rotation sensor is provided in a portion not protected by the protection circuit, it is necessary to provide the protection circuit in the rotation sensor itself.
[0007]
[Patent Document 1]
JP 2000-321093 (paragraph [0002], FIG. 4)
[0008]
[Problems to be solved by the invention]
As described above, when the protection circuit is provided in the rotation sensor S, when molding with the resin 26, the soldered portion of the circuit component may be melted by the heat at the time of molding and disconnected. The problem of low reliability arises. For this reason, when the sensor is provided with a protection circuit, it is necessary to cover the protection circuit with silicone or the like in order to protect the components of the protection circuit from the high temperature and high pressure conditions during molding. As a result, coating increases the number of manufacturing steps of the sensor, leading to an increase in cost.
[0009]
In addition, it is preferable that the protection circuit is not provided or not provided depending on the position where the rotation sensor S is provided in that the optimum rotation sensor S is used at each position. However, it is not preferable to prepare a plurality of rotation sensors S because the number of parts management man-hours increases and the manufacturing cost increases. On the other hand, if protection circuits are provided for all the rotation sensors S, the management of the parts becomes easy, but an overspec sensor is used depending on the mounting location, which is not economical.
[0010]
Accordingly, an object of the present invention is to provide a rotation sensor that can rationally adopt an optimum structure in accordance with the mounting position.
[0011]
[Means for Solving the Problems]
(Feature configuration 1)
In order to achieve the above object, the first characteristic configuration of the rotation sensor according to the present invention, as described in claim 1, includes a sensor element for detecting rotation inside the sensor body, and has a resistor and a capacitor. A recess capable of receiving a protection circuit member is provided in the sensor body, and an engagement portion capable of fixing the position of the protection circuit member to the sensor body is provided between the protection circuit member and the recess, and A terminal (second terminal) extending from the sensor element is erected at the bottom of the recess, and the position of the protection circuit member inserted into the recess is fixed by the engagement portion. The terminal (first terminal) is configured to be fitted to the terminal (second terminal) erected in the recess .
(Action / Effect)
In this way, the engaging portion is provided between the protection circuit member and the recess of the sensor body, and the terminal (second terminal) extending from the sensor element is erected on the bottom of the recess, and the protection inserted into the recess. The position of the circuit member is fixed by the engaging portion, and the terminal of the protective circuit member (first terminal) is configured to be fitted to the terminal of the sensor element (second terminal). The position is fixed by the engaging portion, and the continuity between the sensor element and the protection circuit member can be ensured by the engagement between the first terminal and the second terminal. In this way, by sharing the functions of position fixing and ensuring conduction, the function can be maintained over a long period of time while ensuring the attachment of the protection circuit member.
In addition, since the space for attaching the protection circuit member uses a part of the recess into which the end of the connector connected to the sensor body is inserted, it is possible to obtain a rotation sensor having the protection circuit member while saving space. it can.
Further, since the first terminal of the protection circuit member is fitted to the second terminal protruding from the sensor body, the protection circuit member can be attached after the sensor body is formed. That is, the heat accompanying heat treatment such as mold heat does not affect the protection circuit member. Therefore, there is no inconvenience that the attachment part of the electronic component provided on the protection circuit member is melted by heat or the electronic component itself is damaged by heat.
Furthermore, as in this configuration, if the sensor element is configured to be fitted, the sensor element can be provided only in the rotation sensor provided in the portion where the protection circuit member is required. Therefore, it is possible to prepare a rotation sensor having specifications according to the installation location, and it is possible to provide the rotation sensor without impairing the economy.
[0012]
(Feature configuration 2)
According to a second characteristic configuration of the rotation sensor according to the present invention, as described in claim 2, the first terminal includes a hole portion that can be extrapolated to the second terminal. The inner diameter of the hole is set so that the portion around the hole is deformable when extrapolated to the second terminal, and at least one notch is provided at the edge of the hole. It is in.
(Action / Effect)
Like this structure, while setting the internal diameter of the said hole part so that it may deform | transform when the site | part around a hole part is extrapolated to the said 2nd terminal among said 1st terminals, the edge part of the said hole part By providing at least one notch, the first member is extrapolated to the second terminal while deforming the peripheral region of the hole. Due to this deformation, the first terminal strongly holds the second terminal, and the peripheral region is deformed to prevent the first terminal from coming out, so that the first terminal is firmly connected to the second terminal. it can be.
[0013]
If it is this structure, the rotation sensor provided in the location where surge resistance is requested | required can be comprised more rationally.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a rotation sensor according to the present invention will be described with reference to the drawings.
[0015]
[First Embodiment]
(Overview)
The rotation sensor S according to the present embodiment is used to measure, for example, the rotational speed of a vehicle engine, the rotational speed of an axle, and the like. As shown in FIG. 1, the rotation sensor S mainly includes a sensor main body 1 and a sensor element 2 for detecting rotation provided inside the sensor main body 1. The sensor element 2 is a chip built in the front end portion of the sensor body 1, and here, a Hall IC that is a magnetic detection element is used. The sensor element 2 is disposed in the vicinity of a magnetic rotating member provided on an engine rotating member or the like. The magnetic rotating member is provided with, for example, members having N poles and S poles alternately, and the change in the magnetic field caused by the rotation of the members is measured to measure the rotational speed of the rotating member.
[0016]
(Sensor body)
As shown in FIG. 1, the sensor body 1 supports a sensor element 2 therein. The sensor body 1 is composed of a first body 1a in which the sensor element 2 is disposed and a second body 1b through which a terminal extending from the sensor element 2 is inserted. Although not shown, the second main body 1b is attached to another member and is fixed to a predetermined location of the vehicle, for example.
[0017]
The sensor element 2 is temporarily arranged in the first main body 1a, and then injected into the first main body 1a to be integrated with the first main body 1a. A sensor substrate 3 for processing a signal obtained from the sensor element 2 is connected to the sensor element 2. The sensor substrate 3 is provided on the second main body 1b side, for example. The sensor substrate 3 is provided with another terminal 3 a connected to the terminal 2 a provided on the sensor element 2. The terminal 2a of the sensor element 2 and the terminal 3a can be connected by spot welding or soldering.
[0018]
As shown in FIG. 1, another terminal extends from the sensor substrate 3. In the present embodiment, this terminal is configured to penetrate the bottom of the second main body 1b. A terminal of the protection circuit member 4 described later is attached to the penetrated terminal.
[0019]
(Protection circuit member)
A protection circuit member 4 for improving surge resistance can be attached to the rotation sensor S according to the present invention. The protection circuit member 4 is not always attached to the rotation sensor S but can be attached only to the necessary rotation sensor S.
The configuration of the protection circuit member 4 according to the present embodiment is shown in FIGS. The protection circuit member 4 includes a set of terminals 5 (hereinafter referred to as “first terminals 5A”) for attachment. The first terminal 5A can be made of various metals as long as it is a conductive material. An electronic component 6 having a resistor and a capacitor is provided between the terminals. The electronic component 6 includes a lead part, a chip part, and the like, and the lead part is connected to the first terminal 5A. The connection is performed by a method such as welding or soldering.
[0020]
As shown in FIG. 2A, the set of first terminals 5A is initially composed of a continuous member. That is, the first terminals 5A are extended at both ends of the B-shaped plate-like member 5a. The electronic component 6 is attached to this member. Then, resin is inject | poured with respect to the plate-shaped member 5a and the electronic component 6, and both are integrally molded. Further, the portion protruding from the molding material in the B-shaped plate-like member 5a is removed as shown in FIG. 2B to obtain the protection circuit member 4 of the present embodiment.
By configuring the protection circuit member 4 in this way, it is possible to effectively prevent the first terminal 5A from being twisted during manufacture.
[0021]
The pair of first terminals 5A are formed with holes 8 that can be fitted into terminals 7 (hereinafter referred to as “second terminals 7A”) extending from the sensor element 2 side. For example, as shown in FIG. 2, a rectangular hole 8 is provided. The plate-like member 5a having the hole 8 and the B-shaped portion is formed by, for example, punching. By forming in this way, the first terminal 5A can be efficiently manufactured.
[0022]
Further, the narrow side of the opening width of the hole 8 is configured to be narrower than the outer diameter width of the second terminal 7A. Further, at least one notch 9 is provided at the edge of the hole 8. In the present embodiment, cuts 9 are respectively provided at the four corners of the hole 8.
[0023]
With this configuration, when the protection circuit member 4 is extrapolated to the second terminal 7A, the peripheral region of the hole 8 is elastically deformed as shown in FIG. By this deformation, the first terminal 5A can firmly hold the second terminal 7A and can strongly resist the withdrawal of the first terminal 5A.
Thus, if the hole portion 8 of the present embodiment is formed, the first terminal 5A has a very simple structure, and the attachment of the protection circuit member 4 to the sensor body 1 is very easy and strong. Become a thing. And since the protection circuit member 4 can be retrofitted easily, the rotation sensor S provided in the location where surge resistance is requested | required can be comprised rationally.
[0024]
Further, since the first terminal 5A of the protection circuit member 4 is fitted to the second terminal 7A protruding from the sensor body 1, the protection circuit member 4 can be attached after the sensor body 1 is formed. . That is, the heat accompanying heat treatment such as mold heat does not affect the protection circuit member 4. Therefore, the inconvenience that the mounting part of the electronic component 6 provided in the protection circuit member 4 is melted by heat or the electronic component 6 itself is damaged by heat does not occur.
[0025]
(Engagement part)
The circuit body 10 of the protection circuit member 4 is configured to be fixed at a predetermined position with respect to the sensor body 1. That is, as shown in FIG. 3, the circuit body 10 has an engagement portion 12 that can be pushed into and fixed to the recess 11 provided in the second body 1 b of the sensor body 1. For this purpose, a convex portion 12 a is provided on the side wall of the concave portion 11. The position of the convex portion 12a is provided so as to have a height substantially the same as the thickness of the circuit body 10 when the circuit body 10 is pushed down to the bottom 11a of the recess 11. Thereby, the convex portion 12a is engaged with the corner portion of the circuit body 10 that has been pushed in, and the circuit body 10 is prevented from coming out.
[0026]
In the rotation sensor S of the present embodiment, the position of the protection circuit member 4 with respect to the sensor body 1 is fixed by the engaging portion 12, and the electrical conductivity between the sensor element 2 and the protection circuit member 4 is the same as that of the first terminal 5A. This is done by engaging with the second terminal 7A. In this way, by sharing the functions of position fixing and ensuring conduction, the function can be maintained over a long period of time while ensuring the attachment of the protection circuit member 4.
[0027]
The concave portion 11 is originally a portion into which an end portion of a connector that is further connected to the sensor body 1 is inserted. Since the rotation sensor S uses such a mounting recess 11, the protection circuit member 4 can be mounted while saving space.
[0028]
(effect)
As described above, in the rotation sensor S of the present invention, since the first terminal 5A of the protection circuit member 4 is configured to be fitted to the second terminal 7A extending from the sensor element 2, the mounting structure of both is extremely high. This simplifies the operation of attaching the protection circuit member 4 to the sensor body 1. Moreover, since the protection circuit member 4 is attached when the sensor body 1 of the rotation sensor S is almost completed, the soldered portion of the protection circuit member 4 is melted by mold heat when the sensor body 1 is formed. There is no inconvenience.
Thus, if it is rotation sensor S of this invention, rotation sensor S provided in the location where surge resistance is requested | required can be comprised rationally.
[0029]
[Another embodiment]
In the said embodiment, although the shape of the said hole part 8 was made into the rectangular shape, it is not restricted to this shape, For example, the round hole part 8 may be formed. Further, it is preferable that the first terminal 5A and the second terminal 7A are not simply brought into contact with each other, but more reliable conductivity can be secured if both terminals are joined by soldering or the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a rotation sensor of the present invention. FIG. 2 is a schematic diagram showing a configuration of a protection circuit member used in the rotation sensor of the present invention. 4] Sectional view showing the structure of a conventional rotation sensor [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensor main body 2 Sensor element 4 Protection circuit member 5A 1st terminal 7A 2nd terminal 8 Hole 9 Cut 10 Circuit main body 12 Engagement part S Rotation sensor

Claims (2)

A rotation sensor provided with a sensor element for detecting rotation inside the sensor body,
A recess capable of receiving a protection circuit member having a resistor and a capacitor is provided in the sensor body;
An engaging portion capable of fixing the position of the protective circuit member to the sensor body is provided between the protective circuit member and the concave portion, and a terminal (second second) extending from the sensor element at the bottom of the concave portion. Terminal)
The position of the protection circuit member inserted into the recess is fixed by the engaging portion, and a terminal (first terminal) of the protection circuit member is fitted into the terminal (second terminal) erected in the recess. rotation sensor that is configured to so that.   The first terminal includes a hole portion that can be externally inserted into the second terminal, and a portion of the first terminal around the hole portion can be deformed when extrapolated to the second terminal. The rotation sensor according to claim 1, wherein an inner diameter of the hole is set, and at least one cut is provided at an edge of the hole.

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