JP5500111B2 - Sensor device - Google Patents

Description

  The present invention relates to a sensor device that outputs an electrical signal corresponding to a physical quantity.

  A sensor device that detects the pressure of fuel injected into an internal combustion engine by screwing to a body of an injector has been proposed (for example, see Patent Document 1).

  In the structure in which the sensor device is screwed in this way, the rotational direction position of the sensor device with respect to the injector body is not fixed at a specific position when the screw fastening is completed by rotating the sensor device. Therefore, the rotation direction positions of the plurality of sensor terminals taken out from the mold IC are unspecified.

  On the other hand, since the connector attached to the injector body needs to be attached to a specific predetermined position in the injector body, a plurality of terminals (hereinafter referred to as input / output terminals) of the connector arranged on the injector body, and rotational position However, it is difficult to electrically connect a plurality of unspecified sensor terminals. In other words, it is difficult to perform screw fastening so that the sensor terminal is at a pinpoint position facing the input / output terminal when the screw fastening is completed.

  Therefore, as shown in FIG. 7, the sensor device disclosed in Patent Document 1 includes a housing 90 that is screwed into an injector body, and a mold IC 91 is disposed on one end side of the housing 90, and the anti-housing in the mold IC 91 is provided. A relay terminal member 92 is arranged on the side.

  The relay terminal member 92 is formed by molding and integrating a plurality of relay terminals 95 for relaying the sensor terminal 93 of the molded IC 91 and the output side terminal 94 of the output side terminal member. Except for one of the plurality of relay terminals 95, it has an arc-shaped portion, and these relay terminals 95 are arranged concentrically.

  Further, the sensor device includes an output side terminal member in which a plurality of strip-like output side terminals 94 are arranged in parallel and integrated by molding.

  And after integrating the housing 90, mold IC91, and the relay terminal member 92, they are screw-fastened to an injector body. Subsequently, the output-side terminal member is disposed on the side opposite to the housing of the relay terminal member 92, and the relay terminal 95 and the output-side terminal 94 are welded at a portion where they overlap each other in the rotation axis direction of the housing 90.

JP 2010-242574 A

  In the conventional sensor device, the housing 90, the mold IC 91, and the relay terminal member 92, which are component parts, are generally positioned relative to each other and fixed with an adhesive. At this time, the relay terminal member 92 is positioned with respect to the housing 90 with reference to the outer peripheral surface of the mold resin layer in the relay terminal member 92.

  However, since the dimensional accuracy of the resin is low, the coaxiality (axial deviation) between the central axis of the relay terminal member 92 and the central axis of the relay terminal 95 increases when the outer peripheral surface of the mold resin layer is used as a reference. Therefore, there is a problem in that the overlapping portion between the relay terminal 95 and the input / output terminal 94 is out of a predetermined range, and the relay terminal 95 and the input / output terminal 94 cannot be welded.

  Further, the position of the relay terminal member 92 can be specified by a visual device or the like, and the output side terminal member can be positioned in accordance therewith, but in that case, a large facility such as a visual device is required, There is a problem that the position specifying operation of the relay terminal member 92 is not easy.

  The present invention has been made in view of the above points, and it is an object of the present invention to reduce the misalignment between the rotating shaft of the housing and the central axis of the relay terminal member.

  In order to achieve the above object, according to the first aspect of the present invention, the housing (12) to be screwed to the attached member (10) and the electronic component for signal processing disposed on one end side of the housing (12) A mold IC (16) in which (160) is sealed with resin, and a plurality of metal relay terminals (on the side opposite to the housing of the mold IC (16)) and electrically connected to the mold IC (16) ( 200) and a plurality of output terminals (221) that are disposed on the side opposite to the housing of the relay terminal member (20) and are electrically connected to the relay terminal (200). ) And an output-side terminal member (22) integrated with a mold resin, and a sensor device that outputs an electrical signal corresponding to a physical quantity. The output side terminals (221) are strip-shaped and arranged in parallel, and the plurality of relay terminals (200) have concentric circular arc connecting portions that are electrically connected to the output side terminals (221). The outer peripheral surface of the outermost relay terminal that is arranged and located at the outermost part of the relay terminal (200) protrudes radially outward from the mold resin layer (201) in the relay terminal member (20), and relays. It is characterized by being formed coaxially with the central axis of the terminal member (20).

  According to this, since metal generally has higher dimensional accuracy than resin, positioning the relay terminal member with reference to the outer peripheral surface of the outermost relay terminal made of metal makes the reference to the outer peripheral surface of the mold resin layer. As compared with the case where the relay terminal member is positioned, the axial deviation between the rotation shaft of the housing and the central axis of the relay terminal member can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is front sectional drawing which shows the principal part of an injector provided with the sensor apparatus which concerns on one Embodiment of this invention. It is a top view of the injector which shows the state before attaching the output side 1st terminal member. It is a top view of the injector which shows the state after attaching the output side 1st terminal member. (A) is front sectional drawing which shows the sensor apparatus of FIG. 1, (b) is a top view which shows the relay terminal member single-piece | unit in (a). (A) is a top view which shows the output side 1st terminal member single-piece | unit of FIG. 1, (b) is sectional drawing which follows the AA line of (a). (A) is front sectional drawing which shows the sensor apparatus and assembly | attachment jig | tool of FIG. 1, (b) is a top view of (a). (A) is a top view which shows the conventional sensor apparatus, (b) is sectional drawing which follows the BB line of (a).

  An embodiment of the present invention will be described. FIG. 1 is a front sectional view showing an essential part of an injector provided with a sensor device according to an embodiment, FIG. 2 is a plan view of the injector showing a state before assembling the output-side first terminal member, and FIG. FIG. 4 (a) is a front sectional view showing the sensor device of FIG. 1, and FIG. 4 (b) shows the relay terminal member alone in FIG. 4 (a). FIG. 5A is a plan view showing a single output-side first terminal member in FIG. 1, FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. FIG. 6 is a front sectional view showing the sensor device and the assembling jig of FIG. 1, and FIG. 6B is a plan view of FIG.

  As shown in FIGS. 1 and 4, the injector injects high-pressure fuel supplied from a common rail (not shown) into a cylinder of a diesel internal combustion engine, and is made of a metal injector body 10 as a member to be attached. A high-pressure passage 100 through which high-pressure fuel flows and a branch passage 101 branched from the high-pressure passage 100 are formed.

  A cylindrical metal housing 12 with a flange is screwed to the upper end of the injector body 10. The housing 12 includes a male thread part 120 for screwing into the injector body 10 and a thin part 121 that deforms according to the pressure of the fuel guided through the branch passage 101.

  A sensor portion 14 whose resistance value changes according to deformation of the thin portion 121 (in other words, according to the fuel pressure in the high pressure passage 100) is attached to the thin portion 121.

  A mold IC 16 is disposed on one end side of the housing 12 in the direction of the housing rotation axis X so as to surround the thin portion 121 and the sensor portion 14. The mold IC 16 includes a signal processing circuit IC 160 as an electronic component that outputs an electrical signal corresponding to pressure based on a change in resistance value of the sensor unit 14, a lead frame 161 electrically connected to the signal processing circuit IC 160, and the like. It has. The signal processing circuit IC 160 and the lead frame 161 are sealed with a mold resin layer 162 made of a resin having high electrical insulation. A sensor terminal 163 that is a part of the lead frame 161 protrudes from the outer peripheral side surface of the mold resin layer 162.

  A shield cover 18 made of a metal plate for blocking electrical noise is disposed on the side of the mold IC 16 opposite to the housing. A relay terminal member 20 having a plurality of relay terminals 200 is disposed on the side of the shield cover 18 opposite to the housing. The mold IC 16 and the shield cover 18 are bonded with an adhesive, and the shield cover 18 and the relay terminal member 20 are also bonded with an adhesive.

  A first terminal member 22 having a plurality of first terminals is disposed on the non-housing side of the relay terminal member 20, and a second terminal member having a plurality of second terminals on the non-housing side of the first terminal member 22. Further, a substantially cylindrical insulating member 26 made of a resin having a high electrical insulating property is disposed on the side opposite to the housing of the second terminal member 24. A plurality of lead wires 28 pass through the through hole 260 of the insulating member 26. Further, a space between the through hole 260 and the lead wire 28 is sealed with a waterproof member 29 formed in a cylindrical shape with rubber.

  A cylindrical cover 30 is screwed to one end of the injector body 10, and a disk-shaped cap 32 is press-fitted and fixed to the opening end of the cover 30. The housing 12, the mold IC 16 and the like are accommodated in a space surrounded by the injector body 10, the cover 30, and the cap 32.

  As shown in FIGS. 2 and 4, the relay terminal member 20 includes a mold resin layer 201 made of mold resin, and is formed by molding and integrating four relay terminals 200 made of conductive metal. It is in the shape.

  The four relay terminals 200 are connected by a connecting portion 200a indicated by a one-dot chain line in FIG. 4B until molding, and after the molding, the connecting portion 200a is cut off and separated into four. .

  The four relay terminals 200 have one end portions (on the connecting portion 200a side) projecting from the outer peripheral side surface of the mold resin layer 201, and one end portions thereof are welded to the sensor terminal 163 of the mold IC 16.

  Of the four relay terminals 200, three relay terminals 200 include arc-shaped connection portions arranged concentrically around the housing rotation axis X, and the arc-shaped connection portions are exposed on one end surface side of the mold resin layer 201. doing. One relay terminal 200 of the four relay terminals 200 includes a substantially rectangular portion disposed at the center of the housing rotation axis X, and the rectangular portion is exposed on one end surface side of the mold resin layer 201.

  Of the four relay terminals 200, the outermost relay terminal 200 located at the outermost portion is integrally formed with a protruding piece 200b that protrudes radially outward from the outer peripheral surface of the arcuate connection portion. A plurality (three in this example) of the protruding pieces 200b are provided along the circumferential direction of the relay terminal member 20.

  The arcuate outer peripheral surface of the protruding piece 200b is formed to protrude outward in the radial direction from the mold resin layer 201 and to be coaxial with the central axis of the relay terminal member 20. More specifically, the coaxiality between the central axis of the circle circumscribing the outer peripheral surface of these protruding pieces 200b and the central axis of the relay terminal member 20 is set to be sufficiently small.

  As shown in FIGS. 3 and 5, the first terminal member 22 includes a mold resin layer 220 made of a mold resin, and is formed by molding and integrating four first terminals 221 made of a conductive metal. . The mold resin layer 220 is plate-shaped, and a rectangular opening 222 is formed at the center.

  The four first terminals 221 are strips formed by press-molding thin thin plates, and are arranged in parallel. An intermediate portion in the longitudinal direction of the first terminal 221 is located in the opening 222, and a convex portion 223 protruding toward the arc-shaped connection portion or the substantially rectangular portion of the relay terminal 200 is formed at the intermediate portion. Has been. And this convex part 223 is welded with the circular-arc-shaped connection part in the relay terminal 200, or a substantially rectangular-shaped site | part.

  In addition, any one end portion in the longitudinal direction of each first terminal 221 protrudes from the mold resin layer 220. The end 224 on the side protruding in the longitudinal direction is hereinafter referred to as a protruding end 224.

  As shown in FIG. 1, the second terminal member 24 includes a mold resin layer 240 made of a mold resin, and is formed by molding and molding four second terminals 241 made of a conductive metal.

  The second terminal 241 is L-shaped, and both end portions protrude from the mold resin layer 240. One end side of the second terminal 241 is welded to the protruding end 224 of the first terminal 221, and the other end side of the second terminal 241 is electrically connected to the lead wire 28.

  That is, the signal processing circuit IC 160 is electrically connected to the plurality of lead wires 28 via the sensor terminal 163, the relay terminal member 20, the first terminal member 22, and the second terminal member 24. These lead wires 28 are used for power supply of the signal processing circuit IC 160, grounding, sensor signal output for outputting sensor signals to the engine control ECU, and the like.

  Next, a procedure for assembling the housing 12 and the molded body 16 to the injector body 10 will be described.

  First, a sensor sub-assembly is prepared. Specifically, the sensor unit 14 is attached to the thin portion 121 of the housing 12. Subsequently, after the mold IC 16 is fixed to the housing 12 with an adhesive, the sensor unit 14 and the signal processing circuit IC 160 of the mold IC 16 are connected by a bonding wire.

  Subsequently, the shield cover 18 is fixed to the mold IC 16 with an adhesive, and the relay terminal member 20 is further fixed to the shield cover 18 with an adhesive.

  Here, an assembly method for fixing the relay terminal member 20 to the shield cover 18 will be described with reference to FIG.

  A jig 40 shown in FIG. 6 includes a main body portion 41 and a guide portion 42 protruding from the main body portion 41. The main body portion 41 is formed with a female screw portion 42 into which the male screw portion 120 of the housing 12 is screwed. The guide portion 42 is formed with a guide surface 44 with which the outer peripheral surface of the protruding piece 200b of the outermost relay terminal 200 abuts. The guide surface 44 is an arc having a radius equal to a circle circumscribing the outer peripheral surface of the protruding piece 200b. Further, the coaxiality between the center axis of the arc of the guide surface 44 and the center axis of the female screw portion 42 is set to be sufficiently small.

  Then, the male screw portion 120 of the housing 12 is screwed into the female screw portion 42, and the housing 12 in which the sensor portion 14, the mold IC 16 and the shield cover 18 are integrated is fixed to the jig 40. Subsequently, an adhesive is applied to the surface of the shield cover 18 on the side opposite to the housing.

  Subsequently, the relay terminal member 20 is moved toward the shield cover 18 in a state where the outer peripheral surfaces of the three protruding pieces 200b are in contact with the guide surface 44, and the relay terminal member 20 is fixed to the shield cover 18. .

  As described above, by positioning the relay terminal member 20 with reference to the outer peripheral surface of the metallic outermost relay terminal 200 having higher dimensional accuracy than that of the resin, it is possible to obtain the position accuracy of the metal processing tolerance level, and the female screw The axial shift between the central axis of the portion 42 (that is, the housing rotation axis X) and the central axis of the relay terminal member 20 can be reduced.

  Subsequently, the relay terminal 200 and the sensor terminal 163 are welded to complete the sensor sub-assembly. The sensor subassembly is removed from the jig 40 after completion.

  In parallel with the sensor sub-assembly preparation, a lead wire sub-assembly is prepared. Specifically, the output-side second terminal member 24, the lead wire 28, and the waterproof member 29 are integrated, and the cap 32 and the insulating member 26 are integrated. A lead wire sub-assembly is formed by passing the lead wire 28 through the cover 30 and passing the lead wire 28 through the through hole 260 of the insulating member 26.

  Next, the male screw part 120 of the housing 12 in the sensor sub-assembly is screwed into the injector body 10, and the sensor sub-assembly is attached to the injector body 10.

  Subsequently, while positioning the first terminal member 22 with respect to the rotation axis X of the housing 12, the first terminal member 22 is overlaid on the relay terminal member 20 in the sensor subassembly, so that the relay terminal 200 and the first terminal are overlapped. The convex part 223 of 221 is welded.

  Here, as described above, since the axial deviation between the housing rotation axis X and the central axis of the relay terminal member 20 can be reduced, if the first terminal member 22 is positioned with reference to the housing rotation axis X, The axial deviation between the relay terminal member 20 and the first terminal member 22 can be reduced. As a result, the convex portion 223 of the first terminal 221 can be reliably opposed to the relay terminal 200.

  Subsequently, the second terminal member 24 in the lead wire sub-assembly is overlaid on the first terminal 221, and the first terminal 221 and the second terminal 241 are welded.

  Subsequently, the sensor sub-assembly, the first terminal member 22 and the lead wire sub-assembly are secondarily molded with resin while being attached to the injector body 10.

  Subsequently, the cover 30 is screwed into the injector body 10 and the cover 30 is attached to the injector body 10.

  Subsequently, the insulating member 26 is press-fitted into the cover 30, the cap 32 and the insulating member 26 are assembled to the cover 30, and the waterproof member 29 is inserted into the through hole 260 of the insulating member 26. Thus, the assembly of the housing 12 and the mold body 16 to the injector body 10 is completed.

  According to the present embodiment, the outer peripheral surface of the outermost relay terminal 200 made of metal (that is, the outer peripheral surface of the three protruding pieces 200b) is brought into contact with the guide surface 44 so that the relay terminal member 20 is positioned. And the axial shift of the central axis of the relay terminal member 20 can be reduced. Therefore, the axial deviation between the relay terminal member 20 and the first terminal member 22 can be reduced, and as a result, the convex portion 223 of the first terminal 221 can be reliably opposed to the relay terminal 200.

  In the above embodiment, the jig 40 in which the main body portion 41 and the guide portion 42 are integrated is used. However, the jig 40 in which the main body portion 41 and the guide portion 42 are separate can be used. Specifically, a jig provided with a pin on one of the main body portion 41 and the guide portion 42 and a hole formed on the other, or the guide portion 42 in the central axis direction of the female screw portion 42 with respect to the main body portion 41. Use a slidable jig.

  In the case of the former jig, after the housing 12 is screwed into the main body portion 41, a pin is inserted into the hole to set the guide portion 42 at a predetermined position of the main body portion 41. Subsequently, the three protruding pieces 200b With the outer peripheral surface in contact with the guide surface 44, the relay terminal member 20 is moved toward the shield cover 18, and the relay terminal member 20 is fixed to the shield cover 18. According to this, workability at the time of screwing the housing 12 to the main body 41 is improved.

  In the case of the latter jig, the housing 12 is screwed into the main body 41 while the guide 42 is slid away from the main body 41, and then the guide 42 is slid toward the main body 41. Then, the relay terminal member 20 is moved toward the shield cover 18 in a state where the outer peripheral surfaces of the three projecting pieces 200b are in contact with the guide surface 44, and the relay terminal member is moved to the shield cover 18 side. 20 is fixed to the shield cover 18. According to this, workability at the time of screwing the housing 12 to the main body 41 is improved.

  In the above embodiment, the present invention is applied to an injector. However, the present invention can be applied to other than the injector.

  Moreover, although the sensor apparatus which detects a pressure was shown in the said embodiment, this invention is applicable also to the sensor apparatus which detects physical quantities other than a pressure.

10 Injector body (attachment member)
12 Housing 16 Mold IC
20 Relay terminal member 22 Output side terminal member 160 IC for signal processing circuit (electronic component)
200 Relay terminal 201 Mold resin layer 221 First terminal (output side terminal)

Claims (4)

A housing (12) to be screwed onto the mounted member (10);
A mold IC (16) disposed on one end of the housing (12) and encapsulating a signal processing electronic component (160) with a resin;
A relay terminal member (20) in which a plurality of metal relay terminals (200) arranged on the opposite side of the mold IC (16) and electrically connected to the mold IC (16) are integrated with a mold resin. When,
An output-side terminal member (22) in which a plurality of output-side terminals (221) arranged on the opposite housing side of the relay terminal member (20) and electrically connected to the relay terminal (200) are integrated with a mold resin. And
A sensor device that outputs an electrical signal according to a physical quantity,
The plurality of output terminals (221) are strip-shaped and arranged in parallel,
In the plurality of relay terminals (200), arc-shaped connection portions that are electrically connected to the output terminal (221) are arranged concentrically,
An outer peripheral surface of the outermost relay terminal located at the outermost part of the relay terminal (200) protrudes radially outward from the mold resin layer (201) of the relay terminal member (20), and the relay terminal member A sensor device characterized by being formed coaxially with the central axis of (20). The outermost relay terminal includes a protruding piece (200b) that protrudes radially outward from the arc-shaped connecting portion and is arranged along the circumferential direction of the relay terminal member (20),
The outer peripheral surface of the protruding piece (200b) protrudes radially outward from the mold resin layer (201) of the relay terminal member (20). Sensor device.   The sensor device according to claim 2, comprising three or more of the protruding pieces (200b). The attached member (10) is an injector body that injects fuel into the internal combustion engine;
The sensor device according to any one of claims 1 to 3, wherein the physical quantity is a pressure of fuel flowing in the body (10).

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