JP2003244824A - Electrical apparatus having liquid infiltration preventing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical apparatus comprising a liquid infiltration preventing, structure that prevents liquid from infiltrating inside a case through a lead wire attached to the case. <P>SOLUTION: A case-side terminal (47) comprises a terminal connection part (47b), which is electrically connected to a part-side terminal (57) at one end part (47a). It also comprises a fixing part (47c) which connects to the one end part (47a) and is fixed to cases (33 and 39), the other end part (47e) which connects to the fixing part (47c), a sealing part (47f) which is formed at least by the outer peripheral surface of the other end part (47e) on the fixing part (47c) side, and a lead wire housing part (47g) which is formed at the other end part (47e) and extends and terminates at the fixing part (47c). A tip part (45c) of a lead wire (45) is housed in the lead wire housing part (47g) for electrical connection. The cases (33 and 39) comprise an enclosing part (42b), which is molded integrally with the case side terminal (47) and an elastic sealing member (48). The elastic seal member (48) tightly adheres to the seal part (47f) and an inner peripheral surface (42c) of the enclosing part (42b). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device having a liquid permeation preventive structure, and more particularly to an electric device for preventing liquid from permeating into a case through a lead wire attached to the case. The present invention relates to an electric device having a liquid entry prevention structure.

[0002]

2. Description of the Related Art The tip portion of a lead wire is electrically connected to a metal terminal provided in a case, the lead wire extends to the outside of the case, and the base end portion is electrically connected to an external device or the like. There are known various electric devices which are connected to the same and input and output electric signals through the lead wires. An example of such an electric device is a rotation detection sensor that detects the number of rotations of a gear used in a vehicle engine, a transmission, or the like. The rotation detection sensor is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-26
No. 4350 is disclosed.

The rotation detecting sensor disclosed in Japanese Patent Laid-Open No. 2001-264350 will be described with reference to FIGS. 6 and 7. As shown in FIGS. 6 and 7, the rotation detection sensor 10 is electrically connected to a sensor case 1 formed of a synthetic resin in a cylindrical shape with a bottom and a pair of lead wires 14, and is partially connected to the sensor case 1. Body 5 that is housed
And a waterproof cap 7 made of rubber, which is fitted to the upper end of the sensor body 5 while inserting the lead wire 14. The lead wire 14 has a metal core wire 14a and an insulating coating 14b that covers the core wire 14a.

The sensor body 5 includes a rotation detecting means 3, a housing 12 made of synthetic resin, a pair of terminals 9 made of metal,
Equipped with. The rotation detecting means 3 is an electric component including, for example, a Hall IC (that is, a magnetoelectric conversion element) and other electric elements. The housing 12 is integrally formed with the terminal 9 by insert molding so as to be located at an intermediate portion of the terminal 9. The tip of the terminal 9 is the rotation detecting means 3
Are electrically connected to each other, and the base end projects from the housing 12 so as to be exposed to the outside from the sensor body 5. Then, the sensor body 5 is inserted into the insertion opening 17 of the sensor case 1, and the rotation detecting means 3, the tip portion of the terminal 9 and a part of the housing 12 are provided in the bottomed tubular portion 1b of the sensor case 1. Are attached to the sensor case 1 so as to be housed and covered.

As shown in FIG. 7, a welding projection 18 is formed on the periphery of the insertion opening 17 of the sensor case 1 so as to come into contact with the butting surface 12b of the housing 12 when the sensor body 5 is inserted. There is. And the housing 12
The abutting surface 12b of the welding protrusion 1 of the sensor case 1
The sensor main body 5 is fixed to the sensor case 1 by welding while contacting the sensor body 8. Examples of the welding method used here include known welding methods such as ultrasonic welding and orbital vibration welding.

The core wires 14a exposed from the insulating coating 14b at the tips of the lead wires 14 are fixed and electrically connected to one ends of the terminals 9 by soldering or the like. A waterproof cap 7 is fitted to the upper end of the housing 12 of the sensor body 5 so that these lead wires 14 are inserted.

The waterproof cap 7 is fixed to the upper surface of the housing 12 by fitting a fitting groove 7a formed in the lower end thereof with an engaging projection 12a protruding from the upper end of the housing 12. . In the waterproof cap 7, the inner surface of the through hole 7b through which the lead wire 14 is inserted and the outer surface of the insulating coating 14b of the lead wire 14 are in close contact with each other.

As shown in FIG. 6, the sensor case 1 is so arranged that the tip of the rotation detecting means 3 housed in the bottomed cylindrical portion 1b of the sensor case 1 is separated from the outer periphery of the gear 23 by a predetermined distance. The mounting flange portion 1a protruding from the outer periphery of the is fixed to the gear case 21 of the transmission, for example. In the magnetic circuit formed by the magnet built in the Hall IC of the rotation detecting means 3 and the gear 23 having the uneven portion on the outer periphery, the rotation detecting means 3 detects a change in magnetic flux generated due to the rotation of the gear 23, The rotation detection of 23 is performed.

An annular recess 15 is formed on the outer peripheral surface of the sensor case 1, and the annular recess 15 is made of rubber O.
The ring 16 is assembled. The O-ring 16 fills a gap between the inner surface of the insertion hole 22 of the gear case 21 and the outer peripheral surface of the sensor case 1 when the rotation detection sensor 10 is fixed to the gear case 21, and the oil from the gear 23 side is thereby filled. Liquids such as the above are prevented from entering the gap and flowing out of the gear case 21.

Therefore, according to the rotation detecting sensor 10 described above, the housing 12 and the sensor case 1 are welded, the waterproof cap 7 and the housing 12 are fitted together, and the waterproof cap 7 is brought into close contact with the lead wire 14. Therefore, intrusion of liquid such as oil and water, dust, and the like into the rotation detection sensor 10 is prevented.

[0011]

However, the rotation detection sensor 10 is extended (in other words, pulled out) from the rotation detection sensor 10 and electrically connected to an input terminal of an external device or the like in order to transmit a detection signal of the rotation detection sensor 10. When the base end part of the lead wire 14 connected to the lead wire 14 is arranged at a position where it comes into contact with a liquid such as oil, water, etc.
Of the rotation detecting sensor 10 from the tip of the lead wire 14 by penetrating into the insulating coating 14b of
May get inside.

Although the terminal 9 is formed integrally with the housing 12 by insert molding, even if it is insert molding, liquid is completely prevented from entering between the terminal 9 made of metal and the housing 12 made of synthetic resin. You cannot do it. Therefore, the liquid may travel from the tip of the lead wire 14 to one end of the terminal 9, travel between the terminal 9 and the housing 12 toward the other end of the terminal 9, and reach the sensor body 5. . When the liquid enters the inside of the rotation detection sensor 10 in this way, there is a possibility that the performance of the rotation detection sensor 10 may deteriorate, malfunction, failure, or the like may occur.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to prevent liquid from entering the inside of the case through a lead wire attached to the case. An object is to provide an electric device having a structure.

[0014]

In order to achieve the above-mentioned object, an electric device having a liquid permeation preventive structure of the present invention is, as described in claim 1, a case and a part housed in the case. An electric component having a side terminal, an end portion on which a terminal connecting portion electrically connected to the component side terminal is formed, a fixing portion connected to the one end portion and fixed to the case, and a connection portion with the fixing portion. The other end portion to be provided, a seal portion defined by at least the outer peripheral surface of the other end portion on the fixed portion side, and a lead wire housing formed at the other end portion and extending toward the fixed portion and terminating. A case-side terminal having a portion, a lead wire having a tip portion housed in and electrically connected to the lead wire housing portion, and an elastic seal member in close contact with the seal portion, wherein the case is the case The side terminal and the elastic Has a surrounding portion integrally molded with the seal member, is characterized in that said elastic sealing member is in close contact with the inner circumferential surface of the surrounding portion.

According to the first aspect of the present invention, the lead wire accommodating portion at the other end of the case-side terminal extends toward the fixing portion and terminates, so that the liquid travels along the lead wire and leads. Even if it penetrates into the wire accommodating portion, it is blocked by the lead wire accommodating portion and cannot further penetrate into the case from the inside of the case side terminal. Furthermore, since the elastic seal member is in close contact with the inner peripheral surface of the seal portion of the case-side terminal and the surrounding portion of the case, even if liquid leaks from the lead wire accommodating portion, the contact surface between the case and the fixing portion of the case-side terminal can be reached. The liquid does not reach the inside of the enclosure of the case from the outside of the electric device. Therefore, the liquid is prevented from entering the case. Further, the elastic seal member can be compressed by the molding pressure generated when the elastic seal member and the surrounding portion of the case are integrally molded. Therefore, the sealing portion of the case-side terminal and the inner peripheral surface of the surrounding portion of the case can be compressed. The degree of close contact of the elastic seal member can be increased. Since the lead wire accommodating portion at the other end of the case side terminal extends toward the fixing portion and terminates, the end edge of the lead wire is brought into contact with the terminal end portion of the lead wire accommodating portion. This makes it easy to position the tip portion of the lead wire with respect to the lead wire accommodating portion.

Further, according to the present invention, as described in claim 2, an insertion hole is formed at the other end of the case side terminal so as to form the lead wire accommodating portion, and the tip of the lead wire is formed. A portion is inserted into the insertion hole and electrically connected to an inner surface of the other end of the case-side terminal formed by the insertion hole.

According to the second aspect of the present invention, if the opening of the insertion hole is formed at, for example, the edge of the other end of the case-side terminal, the lead wire is accommodated as a liquid reservoir for the liquid that has penetrated along the lead wire. It is also possible to make a part work. Regarding the connection between the tip of the lead wire and the inner surface of the other end of the case side terminal,
The tip of the lead wire may be inserted into the insertion hole, and solder or the like may be poured into the opening of the insertion hole. On the other hand, insert the tip of the lead wire into the insertion hole, and crimp, weld, etc. the outer peripheral wall of the lead wire housing (that is, the other end of the case side terminal) formed by the insertion hole. It is also possible to connect the tip portion of the lead wire to the inner surface of the other end portion of the case-side terminal.

According to a third aspect of the present invention, a window penetrating to the insertion hole is formed on the outer peripheral surface of the other end of the case side terminal, and the window is the other end of the case side terminal. The tip portion of the lead wire is partially exposed from the outer peripheral surface of the portion.

According to the third aspect of the invention, the tip portion of the lead wire inserted into the insertion hole is opened from the outer peripheral surface of the other end of the case-side terminal (that is, the outer peripheral wall of the lead wire accommodating portion) to the window. Through the window, solder the tip of the lead wire to the inner surface of the other end of the case-side terminal, weld,
It becomes easy to connect by the above.

Further, according to the present invention, as described in claim 4, the lead wire accommodating portion has a concave surface, and the tip portion of the lead wire is electrically connected to the concave surface. I am trying. On the other hand, instead of this concave surface, as described in claim 5, the lead wire accommodating portion has a flat surface,
The tip portion of the lead wire may be electrically connected to the plane. According to the inventions of claims 4 and 5, if the other end is formed so that the concave surface or the flat surface is exposed from the other end of the case-side terminal, the tip portion of the lead wire can be easily attached. It can be connected to a concave surface or a flat surface.

Further, according to the present invention, as described in claim 6, the case-side terminal and the elastic seal member are insert-molded in the surrounding portion of the case.

According to the sixth aspect of the present invention, by using the insert molding, it is possible to enhance the sealing property of the liquid entry prevention structure of the present invention. That is, the elastic seal member can be compressed by the molding pressure generated when the case-side terminal and the elastic seal member are insert-molded in the enclosure portion of the case. Therefore, the seal portion of the case-side terminal and the enclosure portion of the case can be compressed. The degree of close contact of the elastic seal member with the inner peripheral surface can be increased.

The elastic seal member may be provided with a lead wire insertion hole which is in close contact with the outer peripheral surface of the lead wire extended (in other words, pulled out) from the other end of the case side terminal. By providing such a lead wire insertion hole in the elastic seal member, the liquid does not enter the inside of the surrounding portion of the case from the outside along the outer surface of the lead wire. Further, since the lead wire is supported by the elastic seal member at the lead wire insertion hole, even if stress is applied to the lead wire, the elasticity of the elastic seal member can alleviate the stress. Therefore, it is possible to prevent the lead wire from being damaged or broken due to the stress.
That is, the elastic seal member is composed of a seal and a stress absorption damper.
Play one role.

The elastic seal member may be provided with a portion that comes into contact with the edge of the other end of the case-side terminal, and the elastic seal member may be positioned with respect to the case-side terminal by this contact.

Incidentally, a plurality of annular projections may be provided in a portion of the elastic seal member that is in close contact with the seal portion of the case side terminal to enhance the degree of close contact with the seal portion.

Examples of the material forming the elastic seal member include elastic materials such as a rubber material, a foamed plastic material, and a composite material containing a plurality of kinds of materials.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading the embodiments of the invention described below with reference to the accompanying drawings.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of an electric device having a liquid intrusion prevention structure of the present invention, FIG. 2 is a view showing a partial cross section of the electric device, and FIG. 3 is a description of the liquid infiltration prevention structure of the electric device. Figure, Figure 4
FIG. 4A is an enlarged view of a part IV (A) in FIG.
FIG. 4B is a diagram illustrating a case side terminal, and FIG.
5B is a diagram depicting the sensor-side terminal viewed from position IV (C) in FIG. 5, FIG. 5A is a diagram illustrating the shape of the other end of the case-side terminal, and FIGS. 5B to 5E are cases. It is a figure which shows the modification of the shape of the other end part of a side terminal.

For the purpose of facilitating the understanding of the present invention, the present invention is applied to a rotation detecting sensor for detecting the number of rotations of a gear used in a vehicle engine, a transmission or the like as in the description of the prior art, and waterproofing is required. The electric device will be described as an embodiment.

As shown in FIGS. 1 and 2, the rotation detecting sensor 31 of the present embodiment includes a sensor main body 37 which is an electric component in which the rotation detecting means 35 is assembled, and a bottomed cylindrical sensor case 33. And a sensor cover 39 made of synthetic resin that seals the opening edge of the insertion opening 50 of the sensor case 33 in which the sensor body 37 is housed at a predetermined position. That is, the sensor case 33 and the sensor cover 39
Thus, a case of the rotation detection sensor 31 is formed, and an accommodating portion for accommodating the sensor body 37, which is an electric component, is formed in the case.

The sensor case 33 has a bottomed cylindrical portion 41 for accommodating the sensor body 37, and a mounting flange portion projecting in a brim shape at the opening edge of the insertion opening 50 of the bottomed cylindrical portion 41. And 42. The bottomed tubular portion 41 and the mounting flange portion 42 are integrally molded of synthetic resin,
A sensor case 33 is formed. The lower surface 42a of the mounting flange portion 42 has a gear case 21 (see FIG. 3).
It is fixed to the gear case 21 while being in contact with the outer surface such as. By this fixing, the bottom portion 41a of the bottomed tubular portion 41
Is installed at a certain distance from the outer circumference of a gear (not shown) whose rotation is to be detected.

On the mounting flange portion 42, a pair of metal case-side terminals 47 are integrally formed with the surrounding portion 42b by insert molding. Case side terminal 47
The shape of is selected from various shapes such as a cylindrical shape, an elliptic cylindrical shape, and a polygonal cylindrical shape. In this embodiment, the cylindrical case-side terminal 47 is used, but the details will be described later. A retaining projection 47d is formed on the fixing portion 47c of the case terminal 47 that is connected to the one end portion 47a of the case terminal 47 and is fixed by the surrounding portion 42b. The retaining projection 47d is provided on each case side. The terminal 47 is prevented from coming off from the sensor case 33 (that is, the mounting flange portion 42).

The sensor body 37 has a pair of metal-made sensor-side terminals 57 as component-side terminals. Each sensor-side terminal 57 is electrically connected to the rotation detecting means 35, and in the present embodiment, serves as an output terminal for an electric signal output from the rotation detecting means 35. However, the sensor side terminal 57 is also used as an input terminal or an input / output terminal depending on the electric component (electric element) housed in the case.

The case side terminal 47 is connected to the sensor side terminal 57.
A connecting portion 57a electrically connected to the terminal connecting portion 47b provided at the one end portion 47a is vertically provided. The connecting portion 57a of the sensor-side terminal 57 is shown in FIGS. 1, 2 and 4 (C).
As shown in FIG. on the other hand,
The case-side terminal 47 has a terminal connecting portion 4 at one end 47a thereof.
7b, and is integrally formed with the surrounding portion 42b so that at least the terminal connecting portion 47b is exposed from the sensor case 33. In the present embodiment, the case side terminal 47
The upper half of the one end portion 47a is exposed from the synthetic resin forming the sensor case 33, and the terminal connecting portion 47b is formed on the upper half of the one end portion 47a.

The sensor-side terminal 57 has a connecting portion 57a located near the terminal connecting portion 47b of the case-side terminal 47 when the sensor main body 37 is housed in the sensor case 33, or preferably in contact with the terminal connecting portion 47b. Thus, the sensor body 37 is arranged. At this time, the accommodation hole 57b of the sensor-side terminal 57 is arranged so as to accommodate the terminal connection portion 47b of the case-side terminal 47, and the connection portion 57a of the sensor-side terminal 57 is welded, soldered, coated with a conductive adhesive, or the like. Is fixed and electrically connected to the terminal connecting portion 47b of the case side terminal 47.

Regarding the electrical connection between the connecting portion 57a of the sensor side terminal 57 and the terminal connecting portion 47b of the case side terminal 47, if they are in stable and reliable contact, welding or soldering is possible. It is not necessary to carry out application, application of a conductive adhesive, and the like. As shown in FIG. 3, in this embodiment, the connection portion 57a of the sensor side terminal 57 is fixed to the one end portion 47a of the case side terminal 47 by the solder 46. Since the metal material forming the case-side terminal 47 and the sensor-side terminal 57 is soldered, it is desirable that the metal material has a high heat resistance temperature and a high solderability. Examples of the solder include general tin-lead alloy solder, lead-free solder, aluminum solder, silver-containing solder, flux-containing solder, and chlorine-free flux-containing solder. The type of solder may be selected in consideration of various characteristics of electric parts (electric elements) housed in the case of the electric device and characteristics of the metal material of the case-side terminal 47 and the sensor-side terminal 57. It should be noted that the sensor-side terminal 57 is not provided with the accommodation hole 57b, and the edge of the one end portion 47a of the case-side terminal 47 is used as a terminal connecting portion 47b, and the connecting portion 57a of the sensor-side terminal 57 is electrically connected to this terminal connecting portion 47b. May be connected to.

As shown in FIG. 1, a pair of lead wires 45.
The rotation detection sensor 31 is provided with
Further, as shown in FIG. 4A, the tip portions 45c of the lead wires 45 are housed in the case-side terminals 47 and electrically connected to each other. Each lead wire 45 is a core wire 45.
a and an insulating coating 45b covering the core wire 45a, the insulating coating 45b is peeled off so as to expose the core wire 45a, and the exposed portion of the core wire 45a forms a tip portion 45c of the lead wire 45.

As shown in FIG. 4B, the case side terminal 47 accommodates the tip end portion 45c of the lead wire 45 and is electrically connected to the lead wire 45.
g at the other end 47e. The other end 47e is connected to the above-mentioned fixed portion 47c. Therefore, the case side terminal 4
7 is formed by integrally molding one end portion 47a, a fixing portion 47c, and the other end portion 47e in the axial direction and connecting them. The lead wire accommodating portion 47g extends toward the fixing portion 47c and terminates at the terminating surface 47i.
It is provided by forming h on the edge 47k of the other end 47e. That is, the insertion hole 47h is formed in the case-side terminal 4
7 does not penetrate to both ends of the lead wire housing portion 47.
It terminates at the termination surface 47i so as to define g.

The lead wire accommodating portion 47g has a concave or arcuate inner surface 47j, and at least a part of the inner surface 47j and the end surface 47i has a tip portion 45 of the lead wire 45.
c is electrically connected. The tip portion 45c of the lead wire 45 is formed by welding, soldering, application of a conductive adhesive, or the like.
May be fixed to the lead wire accommodating portion 47g, or the lead wire accommodating portion 47g may be caulked from the outside to fix the tip end portion 45c of the lead wire 45. Alternatively, the tip end portion 45c of the lead wire 45 may be inserted into the insertion hole 47h and solder may be poured into the opening of the insertion hole 47h. The case-side terminal 47 and the tip portion 45c of the lead wire 45 (that is, the core wire 45a)
It is desirable that the metal material forming the metal be a conductive metal material suitable for performing welding, soldering, application of a conductive adhesive, and the like. When the tip portion 45c of the lead wire 45 is housed in the lead wire housing portion 47g, the tip portion 45 of the lead wire 45 is
The edge of c may be brought into contact with the terminal surface 47i, and when the contact is made, the lead wire 45 can be positioned with respect to the case-side terminal 47. A modification of the lead wire accommodating portion 47g will be described later with reference to FIGS. 5 (A) to 5 (E). The case-side terminal 47 includes the seal portion 4 defined by at least the outer peripheral surface of the other end portion 47e on the fixed portion 47c side.
It has 7f.

Further, the rotation detecting sensor 31 is provided with an elastic seal member for ensuring waterproofness. Examples of the material forming the elastic seal member include a rubber material, a foamed plastic material, a composite material containing a plurality of types of materials,
Elastic materials such as In this embodiment, a rubber bush 48 (that is, a rubber elastic seal member) is used as the elastic seal member. As shown in FIGS. 1 to 4A, the rubber bush 48 has a lead wire insertion hole 48a, and the outer peripheral surface of the other end portion 47e of the case side terminal 47 and the sensor case 33 (that is, the attachment). It is arranged so as to fill the space formed between the surrounding portion 42b of the flange portion 42). In particular, the rubber bush 48 includes the surrounding portion 42b.
Inner peripheral surface 42c and seal portion 47 of case-side terminal 47
It is in close contact with f. The lead wire 45 is the lead wire insertion hole 4
The tip portion 45c of the rubber bush 48 inserted through the rubber bush 8a is housed and electrically connected to the lead wire housing portion 47g of the case-side terminal 47. The rubber bush 48 is insert-molded in the surrounding portion 42b of the sensor case 33 in the state of being assembled to the case-side terminal 47 in this manner, whereby the sensor case 33 is integrally molded with the case-side terminal 47 and the rubber bush 48. There is. As shown in FIG. 1, a pair of lead wires 45
In this embodiment, an integrated rubber bush 48 is used for (and the pair of case-side terminals 47).

The molding pressure generated at the time of integral molding with the sensor case 33 increases the degree of adhesion of the rubber bush 48 to the inner peripheral surface 42c of the surrounding portion 42b, and at the same time, the surrounding portion 4
The degree of adhesion of the rubber bush 48 to the outer peripheral surface of the other end portion 47e of the case-side terminal 47 facing the inner peripheral surface 42c of the 2b is also increased. A plurality of annular ridges 48c are formed on the surface of the rubber bush 48 that is in close contact with the outer peripheral surface of the other end 47e of the case-side terminal 47. These annular protrusions 48c are formed so that the rubber bush 48 is easily elastically deformed by a molding pressure generated when integrally molded with the sensor case 33. The rubber bush 48 is formed on the outer peripheral surface of the other end 47e of the case-side terminal 47. The degree of adhesion of 48 is further enhanced. Further, the rubber bush 48 has an annular recess 48b on the outer peripheral surface thereof, and the annular recess 48b prevents the rubber bush 48 from falling off from the surrounding portion 42b. The lead wire insertion hole 48a of the rubber bush 48 is in close contact with the outer peripheral surface of the portion of the lead wire 45 exposed from the end edge 47k of the case-side terminal 47. Here, the lead wire 45 is the lead wire insertion hole 48.
Since it is supported by the rubber bush 48 at location a, even if stress is applied to the lead wire 45,
The stress can be relieved by the elasticity of. Therefore, it is possible to prevent the lead wire 45 from being damaged or broken due to the stress. That is, the rubber bush 48 serves not only as a seal but also as a stress absorption damper. Further, the rubber bush 48 is provided at the other end portion 4 of the case side terminal 47.
It has a contact surface 48d that contacts the edge 47k of 7e. The rubber bush 48 is positioned with respect to the case-side terminal 47 by bringing the contact surface 48d into contact with the end edge 47k.

Now, since the lead wire accommodating portion 47g of the other end portion 47e of the case side terminal 47 extends toward the fixing portion 47c and terminates, it is drawn on the lead wire 45 in FIG. 4 (A). Even if a liquid such as oil, water, or the like penetrates into the lead wire accommodation portion 47g through the inside of the lead wire 45 (that is, inside the insulating coating 45b) as indicated by the arrow, the lead wire accommodation portion 47g causes It is blocked so that it cannot penetrate into the sensor case 33 from the inside of the case side terminal 47 any more. Therefore, it is possible to prevent the liquid from entering the inside of the case. Further, since the rubber bush 48 described above is in close contact with the periphery of the seal portion 47f of the case side terminal 47, even if the liquid leaks from the lead wire accommodating portion 47g, the liquid is fixed to the fixing portion 47c of the case side terminal 47. It does not penetrate into the inside of the sensor case 33 through the gap between the contact surface between the surrounding portion 42b that fixes the fixed portion and the fixed portion 47c. Also, the contact surface 48d of the rubber bush 48
It is also effective to closely contact the edge 47k of the case-side terminal 47. When a window or the like penetrating to the lead wire accommodating portion 47g is formed on the outer peripheral surface of the other end portion 47e of the case side terminal 47, the rubber bush 48 is formed so as to liquid-tightly seal the window.
Must be in close contact with the periphery of the seal portion 47f of the case-side terminal 47. In other words, the window must be provided on the outer peripheral surface of the other end portion 47e of the case-side terminal 47 that can be liquid-tightly sealed by the rubber bush 48. Further, the rubber bush 48 is provided on the inner peripheral surface 4 of the surrounding portion 42b.
Since it closely adheres also to 2c, the surrounding portion 42 from the outside
Liquid does not enter the inside of b. Therefore, the liquid is prevented from entering the case. Furthermore, since the rubber bush 48 is in close contact with the outer peripheral surface of the lead wire 45 at the lead wire insertion hole 48a, the liquid is transmitted to the inside of the rubber bush 48 through the outer surface of the insulating coating 45b of the lead wire 45. It does not infiltrate.

FIG. 5A is a perspective view showing the shape of the other end portion 47e of the case side terminal 47. 5 (B) to FIG.
(E) is a modified example of the shape of the other end portion 47e of the case side terminal 47, specifically, a modified example of the lead wire accommodating portion 47g and the seal portion 47f. 5 (A) to 5 (E), the names of the parts are unified, but in order to avoid confusion, the parts in FIGS. 5 (B) to 5 (E) are the same as those in FIG. 5 (A). Are numbered differently (i.e., reference numbers).

As shown in FIG. 5 (A), the other end portion 47e of the case side terminal 47 is formed into a cylindrical shape so as to form a lead wire accommodating portion 47g, and the end portion 47k from the fixing portion 47c side. The entire outer peripheral surface of the other end 47e of the case-side terminal 47 defines the seal portion 47f.

As shown in FIG. 5B, the other end portion 67e of the case-side terminal 67 is formed in a tubular shape so as to form a lead wire accommodating portion 67g as in the case of FIG. 5A. A window 67x that partially exposes the tip end portion 45c of the lead wire 45 is formed on the outer peripheral surface of the other end portion 67e of the case-side terminal 67. The window 67x facilitates operations such as welding, soldering, and applying a conductive adhesive to the tip portion 45c of the lead wire 45. Of course, the lead wire accommodating portion 67g may be caulked from the outside to fix the tip end portion 45c of the lead wire 45. Further, an end edge 67k for contacting the contact surface 48d of the rubber bush 48 is also formed. In this modification, the outer peripheral surface of the other end 67e of the case-side terminal 67 located on the side of the fixed portion 67c from the window 67x defines the seal portion 67f.

As shown in FIG. 5C, the other end 77e of the case-side terminal 77 is cut off from the upper half of the lead wire accommodating portion 47g shown in FIG. 5A so as to form a lead wire accommodating portion 77g. It is formed in a semi-cylindrical shape. Further, an edge 77k for contacting the contact surface 48d of the rubber bush 48 is also formed. The lead wire accommodating portion 77g has a concave surface 77j, and the tip portion 45c of the lead wire 45 is electrically connected to at least a part of the concave surface 77j and the end surface 77i. The tip portion 45c of the lead wire 45 is attached to the lead wire housing portion 7 by welding, soldering, application of a conductive adhesive, or the like.
The lead wire accommodating portion 77g may be crimped from the outside to fix the tip portion 45c of the lead wire 45. Since the concave surface 77j is thus exposed from the other end 77e of the case-side terminal 77, the tip portion 45c of the lead wire 45 can be easily connected to the concave surface 77j. In the case of this modification, the other end 77e of the case-side terminal 77 located on the fixed portion 77c side from the terminal surface 77i.
The outer peripheral surface of the is defining the seal portion 77f.

As shown in FIG. 5D, the other end portion 87e of the case side terminal 87 is formed in a semi-cylindrical shape so as to form the lead wire accommodating portion 87g. Further, an end edge 87k for contacting the contact surface 48d of the rubber bush 48 is also formed. The lead wire accommodation portion 87g has a flat surface 87j, and the tip portion 45c of the lead wire 45 is electrically connected to at least a part of the flat surface 87j and the end surface 87i. The tip portion 45c of the lead wire 45 is fixed to the lead wire accommodating portion 87g by welding, soldering, application of a conductive adhesive, or the like. Since the flat surface 87j is thus exposed from the other end portion 87e of the case side terminal 87, the tip end portion 45c of the lead wire 45 can be easily connected to the flat surface 87j. In the case of this modification, the end surface 87
The outer peripheral surface of the other end portion 87e of the case-side terminal 87 located on the fixed portion 87c side from i defines a seal portion 87f.

As shown in FIG. 5 (E), the other end portion 97e of the case side terminal 97 is formed in a flat plate shape so as to form a lead wire accommodating portion 97g. Further, an edge 97k for contacting the contact surface 48d of the rubber bush 48 is also formed. The lead wire accommodating portion 97g has two flat surfaces 97
j, and the tip portion 45c of the lead wire 45 is electrically connected to at least a part of the flat surface 97j and the end surface 97i. When the core wire 45a of the lead wire 45 is an assembly of a plurality of thin wires, the core wire 45a may be twisted into two and electrically connected to each plane 97j. welding,
Lead wire 45 by soldering, applying conductive adhesive, etc.
The leading end portion 45c of the lead wire 45 may be fixed to the lead wire housing portion 97g, or the lead wire housing portion 97g may be crimped from the outside to fix the leading end portion 45c of the lead wire 45. Since the flat surface 97j is thus exposed from the other end portion 97e of the case side terminal 97, the tip end portion 45c of the lead wire 45 can be easily connected to the flat surface 97j. In the case of this modification, the outer peripheral surface of the other end portion 97e of the case-side terminal 97 located on the fixed portion 97c side from the terminal end surface 97i defines the seal portion 97f.

Other configurations and contents of the modified examples according to FIGS. 5B to 5E are shown in FIGS.
Since the content is the same as that of the configuration described based on (A), description thereof will be omitted.

In the insertion opening 50 of the sensor case 33, a positioning step 52 for positioning the sensor main body 37 inserted in the bottomed tubular part 41 at a predetermined position, and the positioning step 52. Is also provided with a welding step portion 53 located above.

The sensor body 37 has a case fitting portion 55a whose lower surface abuts on the positioning step portion 52 and is fitted into the insertion opening 50, and a housing 55b which supports the assembled rotation detecting means 35. The case fitting portion 55a and the housing 55b are integrally formed of synthetic resin. A metal sensor-side terminal 57 electrically connected to the rotation detecting means 35 is insert-molded in the case fitting portion 55a and the housing 55b, and an end portion of the sensor-side terminal 57 is case-fitted. It projects from the outer surface of the portion 55 a toward the case-side terminal 47.

The sensor body 37 is, for example, a Hall IC (that is, a magnetoelectric conversion element) 35a as the rotation detecting means 35 and other electric elements (a capacitor 35b in this embodiment).
And the like, which is an electric component including a magnet incorporated in the Hall IC 35a at the tip and a gear (not shown) to be detected, and changes in magnetic flux caused by rotation of the gear are detected. The rotation of the body gear is detected.

Then, the rotation detecting sensor 31 of the present embodiment.
Then, as shown in FIG. 3, the sensor main body 3 in a state where the adhesive 61 is filled in the bottomed tubular portion 41 of the sensor case 33.
7, the sensor side terminal 57 and the lead wire 45 are electrically connected and the sealing material 46 is fixed, and then the sensor cover 39 is inserted into the insertion opening 50 of the sensor case 33.
To be fitted.

As shown in FIG. 3, the sensor cover 39 covers the insertion opening 50 from above the sensor main body 37 housed in the sensor case 33 to prevent liquid, dust or the like from entering the sensor case 33. It prevents intrusion. As shown in FIG. 2, the sensor cover 39 is an integrally molded product of synthetic resin, and a pressing projection 39b and a welding rib 39c are provided on the inner surface of a top plate 39a that covers the insertion opening 50. There is.

The pressing protrusion 39b is substantially located near the center of the top plate 39a so that the tip portion presses the upper surface of the case fitting portion 55a and presses the sensor body 37 against the positioning step portion 52 for positioning. It is provided so as to project in a U shape. Further, the welding rib 39c is provided so as to project in an annular shape along the peripheral edge of the top plate 39a so that the tip end portion contacts the welding step portion 53 when the sensor cover 39 is covered from above the sensor body 37. Has been.

The pressing projections 39b and the welding ribs 39c are set to such heights that the tips of the pressing projections 39b abut the upper surface of the case fitting portion 55a and the welding stepped portion 53 at substantially the same time. Since the tip portion of the element is also appropriately melted by ultrasonic vibration when the welding rib 39c of the sensor cover 39 is welded, it can be set slightly higher.

The rotation detecting sensor 31 of this embodiment described above.
In (1), the sensor main body 37 is inserted into the sensor case 33, the case fitting portion 55a is seated on the positioning step portion 52 to be housed in a predetermined position, and then the sensor cover 39 is put on the sensor main body 37. Then, as shown in FIG.
The welding rib 39c is welded to the welding stepped portion 53 while pressing and pushing the welding direction toward the sensor cover 3
9 is integrated so as to cover the insertion opening 50 of the sensor case 33 and seals the inside of the sensor case 33. By integrating the sensor cover 39 and the sensor case 33, infiltration of liquid, dust or the like into the case can be prevented.

The present invention is not limited to the above-described embodiment, but can be modified, improved, etc. as appropriate. In addition, the material, shape, size, form, number, location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

[0059]

As described above, according to the present invention, since the lead wire accommodating portion at the other end of the case-side terminal extends toward the fixing portion and terminates, the liquid is the lead wire. Even if it penetrates into the lead wire accommodating portion along the path, it is blocked by the lead wire accommodating portion and cannot further penetrate into the case from the inside of the case side terminal. Furthermore, since the elastic seal member is in close contact with the inner peripheral surface of the seal portion of the case-side terminal and the surrounding portion of the case, even if liquid leaks from the lead wire accommodating portion, the contact surface between the case and the fixing portion of the case-side terminal can be reached. The liquid does not reach the inside of the enclosure of the case from the outside of the electric device. Therefore, the liquid is prevented from entering the case. Further, the elastic seal member can be compressed by the molding pressure generated when the elastic seal member and the surrounding portion of the case are integrally molded. Therefore, the sealing portion of the case-side terminal and the inner peripheral surface of the surrounding portion of the case can be compressed. The degree of close contact of the elastic seal member can be increased. Since the lead wire accommodating portion at the other end of the case side terminal extends toward the fixing portion and terminates, the end edge of the lead wire is brought into contact with the terminal end portion of the lead wire accommodating portion. This makes it easy to position the tip portion of the lead wire with respect to the lead wire accommodating portion.

Further, according to the present invention, if the opening of the insertion hole is formed at the other end of the case-side terminal, for example, at the edge, the lead wire accommodating portion functions as a liquid reservoir for the liquid that has penetrated along the lead wire. You can also let it. Regarding the connection between the tip portion of the lead wire and the inner surface of the other end of the case-side terminal, the tip portion of the lead wire may be inserted into the insertion hole and solder or the like may be poured into the opening of the insertion hole. . On the other hand, insert the tip of the lead wire into the insertion hole, and crimp, weld, etc. the outer peripheral wall of the lead wire housing (that is, the other end of the case side terminal) formed by the insertion hole. It is also possible to connect the tip portion of the lead wire to the inner surface of the other end portion of the case-side terminal.

Further, according to the present invention, when the window penetrating to the insertion hole is formed on the outer peripheral surface of the other end of the case side terminal, the tip portion of the lead wire inserted into the insertion hole is the case side terminal. Since it is exposed by the window from the outer peripheral surface of the other end portion (that is, the outer peripheral wall of the lead wire accommodating portion), the tip portion of the lead wire is soldered to the inner surface of the other end portion of the case side terminal through this window,
Connection can be facilitated by welding, application of a conductive adhesive, or the like.

Further, according to the present invention, if the other end portion is formed so that the concave surface or the flat surface is exposed from the other end portion of the case side terminal, the tip portion of the lead wire can be easily connected to the concave surface or the flat surface. be able to.

Further, according to the present invention, by using the insert molding, it is possible to enhance the sealing property of the liquid entry prevention structure of the present invention. That is, the elastic seal member can be compressed by the molding pressure generated when the case-side terminal and the elastic seal member are insert-molded in the enclosure portion of the case. Therefore, the seal portion of the case-side terminal and the enclosure portion of the case can be compressed. The degree of close contact of the elastic seal member with the inner peripheral surface can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an electric device having a liquid intrusion prevention structure of the present invention.

FIG. 2 shows a partial cross section of an electric device.

FIG. 3 is a diagram illustrating a liquid intrusion prevention structure of an electric device.

4 (A) is an enlarged view of a part IV (A) in FIG. 3, FIG. 4 (B) is a view illustrating a case side terminal, and FIG.
FIG. 4 is a diagram depicting the sensor side terminal viewed from position IV (C) in FIG. 2.

FIG. 5A is a diagram showing the shape of the other end of the case side terminal, and FIGS. 5B to 5E are diagrams showing a modification of the shape of the other end of the case side terminal.

FIG. 6 is a sectional view illustrating a conventional rotation detection sensor disclosed in Japanese Patent Laid-Open No. 2001-264350.

FIG. 7 is an exploded view of the rotation detection sensor of FIG.

[Explanation of symbols]

31 Rotation detection sensor (electrical device) 33 Sensor case (case) 37 Sensor body (electrical parts) 39 Sensor cover (case) 42b Surrounding part 42c Inner peripheral surface of surrounding portion 45 lead wire 45c Lead wire tip 47 Case side terminal 47a One end of the case side terminal 47b Terminal connection part 47c fixed part 47e The other end of the case side terminal 47f Seal part 47g Lead wire housing 48 rubber bush (elastic seal member) 48a Lead wire insertion hole

Claims (6)

[Claims] 1. A case, an electric part that is housed in the case and has a component-side terminal, and a terminal connecting portion that is electrically connected to the component-side terminal. A fixed part fixed to the case, the other end connected to the fixed part, a seal part defined by at least the outer peripheral surface of the other end on the fixed part side, and the other end formed A case-side terminal having a lead wire accommodating portion extending toward the fixing portion and terminating, a lead wire having a tip portion accommodated in the lead wire accommodating portion and electrically connected, and the seal portion An elastic seal member that is in close contact with the case, the case has an enclosure part integrally formed with the case-side terminal and the elastic seal member, and the elastic seal member is in close contact with the inner peripheral surface of the enclosure part. Characterized by Electrical device having a liquid entering prevention structure. 2. An insertion hole is formed at the other end of the case-side terminal so as to form the lead wire accommodating portion, and a tip portion of the lead wire is inserted into the insertion hole, and
The electric device having a liquid intrusion prevention structure according to claim 1, wherein the electric device is electrically connected to an inner surface of the other end of the case-side terminal formed by the insertion hole. 3. A window penetrating to the insertion hole is formed on the outer peripheral surface of the other end of the case side terminal, and the window extends from the outer peripheral surface of the other end of the case side terminal to the tip portion of the lead wire. The electric device having the liquid intrusion prevention structure according to claim 2, wherein the electric device is partially exposed. 4. The liquid intrusion prevention structure according to claim 1, wherein the lead wire accommodating portion has a concave surface, and the tip portion of the lead wire is electrically connected to the concave surface. Electrical device having. 5. The liquid intrusion prevention structure according to claim 1, wherein the lead wire accommodating portion has a flat surface, and the tip portion of the lead wire is electrically connected to the flat surface. Electrical device having. 6. The electric device having a liquid intrusion prevention structure according to claim 1, wherein the case-side terminal and the elastic seal member are insert-molded in the surrounding portion of the case.