JP2018054298A - Sensor component, sensor and sensor manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor component, a sensor and a sensor manufacturing method capable of preventing moisture reaching to a holder section along a conducting body of an electric wire from seeping into a sensor body.SOLUTION: A sensor component P comprises: a sensor body 21; a sensor section 20 which has a connection terminal 22 extended from the sensor body 21; and a holder section 30 which holds the sensor section 20. The connection terminal 22 is subjected to resin seal by an external section 40 with the same connected to a conducting body 12 of an electric wire 11. A melt section 50, which melts when the external section 40 is molded, is installed at a position, on an external surface of the holder section 30, where a connection section 23 connecting the connection terminal 22 and the conducting body 12 is separated from the sensor body 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sensor component, a sensor, and a method for manufacturing the sensor.

  Conventionally, a sensor is known in which a sensor component connected to a terminal portion of a wire harness is resin-sealed at an exterior portion (for example, described in Patent Document 1 below). The sensor component is a sensor part having a sensor main body and a connection terminal extending from the sensor main body, which is held by the holder part, and the conductor of the electric wire is connected to a part of the connection terminal exposed from the holder part. ing. The exterior part is molded by housing the sensor component with the electric wire connected in a mold, and injecting a synthetic resin into the mold and curing it.

JP, 2014-130100, A

  However, in the above configuration, there is a possibility that a gap is formed at the boundary between the holder portion and the exterior portion. If there is a gap between the holder part and the exterior part, the moisture that reaches the holder part through the conductor of the electric wire passes through the gap between the exterior part and the sensor body, causing a problem in the sensor part. There is a risk of causing it.

  The present invention has been completed on the basis of the above situation, a sensor component capable of preventing moisture that has reached the holder part through the conductor of the electric wire from entering the sensor body, the sensor, And it aims at providing the manufacturing method of a sensor.

The sensor component of the present invention has a sensor body and a sensor portion having a connection terminal extending from the sensor body, and a holder portion for holding the sensor portion, and the connection terminal is connected to a conductor of an electric wire. It is a sensor component that is resin-sealed by an exterior part in a state, and at the time of molding the exterior part at a position that partitions the connection part between the conductor of the connection terminal and the sensor body on the outer surface of the holder part A melt part is provided.
The sensor of the present invention includes the sensor component and an exterior portion that seals the sensor component with resin, and the melt portion melts and is in close contact with the exterior portion.

  The sensor manufacturing method of the present invention is a method of manufacturing the sensor, wherein the sensor part is manufactured by holding the sensor part on the holder part, and an electric wire is connected to a connection terminal of the sensor part. It is a method that goes through a wire connecting step to connect and a resin sealing step in which the sensor component is resin-sealed with an exterior portion, and in the resin sealing step, the melt portion is melted so as to be in close contact with the exterior portion. It is a method that has become.

  According to the present invention, since the melt part adheres to the exterior part at a position between the connection part of the connection terminal and the sensor body, moisture that reaches the holder part through the conductor of the electric wire enters the sensor body side. Can be prevented.

The perspective view which shows the sensor in a present Example Sectional drawing which shows the positional relationship of the sensor and the rotor of the state fixed to the vehicle Schematic showing the positional relationship between the rotor and sensor The perspective view which shows the sensor component in the state connected to the electric wire Plan view showing sensor parts Side view showing sensor components Bottom view showing sensor components Front view showing sensor parts Rear view showing sensor components Side sectional view of the sensor showing a state where the sensor part is sealed with resin by the exterior part Flat cross-sectional view of the sensor showing the sensor part sealed with resin by the exterior The top view which shows the sensor component in another Example (1). Side view showing sensor components Bottom view showing sensor components

Preferred embodiments of the present invention are shown below.
In the sensor component of the present invention, the melt part may be provided at a position that partitions the adjacent connection parts on the outer surface of the holder part. According to such a structure, since the melt part adheres closely to the exterior part at a position between the adjacent connection parts on the outer surface of the holder part, the connection part adjacent to the moisture that reaches the holder part through the conductor of the electric wire It is possible to prevent short-circuiting to spread.

  In the sensor component of the present invention, the melt part may be a rib protruding from the outer surface of the holder part, and the protruding end side of the rib may have a sharp shape. According to such a structure, since the front-end | tip part of a melt part melt | dissolves easily at the time of shaping | molding of an exterior part, a melt part can be firmly stuck to an exterior part.

<Example>
Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
The sensor in a present Example is a vehicle sensor attached to a vehicle, and is especially the wheel speed sensor S used for measurement of a wheel speed. As shown in FIG. 2, the wheel speed sensor S is fixed to the fixed part B of the vehicle so as to face the rotor R that rotates integrally with the vehicle wheel. The wheel speed sensor S has a wire harness 10 connected to a control device or the like mounted on the vehicle, and the vehicle control device calculates the wheel speed of the vehicle according to the output signal from the wheel speed sensor S, It can be used for control of ABS (anti-lock brake system) and the like.

  As shown in FIG. 1, the wire harness 10 is formed as a single wire by collectively covering the two electric wires 11 with a resin coating or the like. Each electric wire 11 has a conductor 12 covered with an insulating coating 13, and the insulating coating 13 is removed at the terminal portion, and the exposed conductor 12 is electrically connected to the connection terminal 22 of the sensor unit 20. .

  The wheel speed sensor S is obtained by resin-sealing the sensor component P connected to the wire harness 10 with an exterior part 40. As shown in FIG. 6, the sensor component P includes a sensor main body 21, a sensor unit 20 having a connection terminal 22 extending from the sensor main body 21, and a holder unit 30 that holds the sensor unit 20. Yes. The sensor component P is an insert molded product obtained by insert molding (primary molding) of the holder unit 30 using the sensor unit 20 as an insert product. The wheel speed sensor S is an insert molded product obtained by insert molding (secondary molding) of the exterior part 40 using the sensor component P to which the wire harness 10 is connected as an insert product.

Hereinafter, in each component, the extending direction (left side in FIG. 2) of the wire harness 10 from the exterior portion 40 is the rear, the opposite side (right side in FIG. 2) is the front, and the upper side in FIG. The upper and lower sides will be described as lower.
The sensor unit 20 includes a sensor body 21 including a detection element (not shown) that converts a target physical quantity into an electrical quantity and the like, and a connection terminal 22 extending from the sensor body 21.

  The sensor body 21 is formed in a plate shape as a whole by liquid-tightly sealing a detection circuit including a detection element with a molding resin material. As shown in FIG. 6, the sensor main body 21 is embedded in the front end portion of the holder portion 30 with the plate thickness direction being the vertical direction, and the upper surface of the sensor main body 21 is exposed on the upper surface of the holder portion 30. The upper surface of the sensor body 21 is disposed opposite to the outer peripheral surface of the rotor R in a state where the wheel speed sensor S is fixed to the vehicle (see FIG. 2). Note that the sensor unit 20 of the present embodiment is configured as a Hall IC that accommodates a Hall element that is a magnetoelectric conversion element that converts a change in magnetic field into an electrical signal and outputs the electrical signal, and a signal conversion circuit.

  As shown in FIGS. 5 and 6, the connection terminal 22 has an elongated rectangular plate shape and extends in one direction from the sensor main body 21. The sensor unit 20 includes a pair of connection terminals 22, and the pair of connection terminals 22 protrudes from the sensor body 21 substantially in parallel and is bent obliquely downward. A rectangular parallelepiped capacitor 24 is connected to one surface side (upper surface side) of the pair of connection terminals 22. An extension end portion (rear end portion) of the connection terminal 22 is a connection portion 23 to which the conductor 12 of the electric wire 11 is connected.

  The connection terminal 22 has a front end portion (a portion located in the vicinity of the rear side of the sensor body 21) and a connection portion 23 exposed on the upper surface of the holder portion 30. The exposed portion of the front end portion of the connection terminal 22 is located at the bottom of the recessed portion 31 that is recessed one step below the upper surface of the sensor body 21.

A moisture-proof material (not shown) is applied to the exposed portion of the front end portion of the connection terminal 22. The moisture-proof material is applied to the recess 31 and covers the exposed portion of the connection terminal 22. Thereby, even if moisture enters the vicinity of the sensor main body 21, it is possible to prevent the connection terminal 22 from being short-circuited.
The connection portion 23 of the connection terminal 22 is placed on the upper surface of a placement portion 33 formed at the rear portion of the holder portion 30 described later.

  The holder part 30 is made of, for example, a synthetic resin such as nylon resin, and is formed integrally with the sensor part 20. The holder part 30 has a long shape in the front-rear direction as a whole.

  The holder portion 30 has a placement portion 33 that holds the connection portion 23 of the connection terminal 22 on the upper surface side. The placement portion 33 has a plate shape formed along the lower surface of the holder portion 30. The upper surface of the mounting portion 33 is inclined so as to gradually go down toward the rear end, and the lower surface of the mounting portion 33 has a step so that the rear side is lowered by one step. The mounting portion 33 is smaller in width than the front portion of the holder portion 30, and a part of the connection portion 23 projects to both sides in the width direction.

  The holder portion 30 has a first partition wall 34 that partitions between the sensor main body 21 and the connection portion 23. The first partition wall 34 is a wall that stands in front of the placement portion 33, and its wall surface is substantially vertical. The first partition wall 34 is provided over the entire width of the holder portion 30. A capacitor 24 is embedded in the first partition wall 34.

  The holder part 30 has the 2nd partition wall 35 which partitions off between the adjacent connection parts 23. FIG. The 2nd partition wall 35 is a wall which stands between the adjacent connection parts 23, and the wall surface has comprised the substantially right angle. The second partition wall 35 is erected on the upper surface of the placement portion 33 and partitions in the width direction, and extends from the first partition wall 34 to the rear end of the holder portion 30. The second partition wall 35 is provided at the center in the width direction of the placement portion 33 and is substantially perpendicular to the first partition wall 34 in plan view. The second partition wall 35 is smaller in wall thickness dimension (dimension in the width direction in the holder portion 30) than the first partition wall 34.

  As shown in FIG. 6, the upper surface of the second partition wall 35 has an inclination that gradually decreases toward the rear end. The inclination of the upper surface of the second partition wall 35 is the same as the inclination of the upper surface of the mounting portion 33, and the height dimension of the second partition wall 35 is substantially constant in the front-rear direction.

  The holder part 30 has a pair of side walls 36 standing on both sides in the width direction of the placement part 33. The pair of side walls 36 are provided at the front end portion of the placement portion 33 and are continuous with the rear surface of the first partition wall 34. The pair of side walls 36 is one step lower than the first partition wall 34.

  A melt part 50 is provided on the outer surface of the holder part 30. The melt part 50 will be described in detail later.

  The exterior portion 40 is made of the same type of synthetic resin as the holder portion 30 and can be favorably fused with the holder portion 30. As shown in FIG. 1, the exterior part 40 has a long rod shape in the extending direction of the wire harness 10 as a whole, and covers the whole from the terminal part of the wire harness 10 to the front end of the sensor component P.

  A front portion (hereinafter referred to as an exterior front portion 41) of the exterior portion 40 has a quadrangular prism shape, and a rear portion (hereinafter referred to as an exterior rear portion 42) has a cylindrical shape. Most of the holder part 30 is embedded in the exterior front part 41. In the exterior rear portion 42, the placement portion 33 of the holder portion 30 and the terminal portion of the wire harness 10 are embedded. Further, the exterior rear portion 42 is inserted and fixed through an insertion hole 44 of a bracket 43 that is fixed to the vehicle.

  The bracket 43 has a substantially oval plate shape, and an insertion hole 44 is formed at one end in the longitudinal direction, and a fixing hole 45 for fixing the bracket 43 to the vehicle is formed at the other end. The insertion hole 44 and the fixing hole 45 are both substantially circular and penetrate the bracket 43 in the front-rear direction (plate thickness direction). The bracket 43 is integrated with the exterior rear portion 42 inserted through the insertion hole 44 in the insertion hole 44. The wheel speed sensor S is fixed to an appropriate position of the vehicle through a fixing hole 45 of the bracket 43 by a method such as screwing.

  The outer surface of the holder part 30 is provided with a melt part 50 that melts when the exterior part 40 is molded and adheres closely to the exterior part 40. The melt part 50 is a rib protruding from the outer surface of the holder part 30 and has a triangular cross-section with a sharpened projecting end.

  As shown in FIG. 5, the melt part 50 is provided so as to partition the first melt part 50 </ b> F provided so as to partition between the connection part 23 and the sensor body 21 and the adjacent connection part 23. And a second melt part 50S.

  The first melt part 50F is provided at an intermediate part in the front-rear direction of the holder part 30 and extends in a direction substantially orthogonal to the front-rear direction. The first melt part 50F is provided so as to continuously surround the entire circumference of the holder part 30 as a whole. The first melt part 50F is provided in a double manner on the moisture intrusion path in the front-rear direction.

  The first melt portion 50 </ b> F is provided on the first upper surface melt portion 51 provided on the upper surface of the holder portion 30, the first side surface melt portion 52 provided on both the left and right sides of the holder portion 30, and the lower surface of the holder portion 30. The first lower surface melt part 53 is provided. All of the first upper surface melt part 51, the first side surface melt part 52, and the first lower surface melt part 53 are formed so as to be substantially parallel to each other in the front and rear direction.

  As shown in FIG. 5, the first upper surface melt part 51 is provided on the upper surface of the first partition wall 34. Of the pair of front and rear first upper surface melt portions 51, a rear first upper surface melt portion 51 is connected to a second upper surface melt portion 55 described later.

  As shown in FIG. 6, the first side surface melt part 52 hangs down the side surface of the holder part 30 substantially vertically from both ends in the width direction of the first upper surface melt part 51 and reaches the lower surface of the holder part 30.

  As shown in FIG. 7, the first lower surface melt portion 53 extends to the lower end of the first side surface melt portion 52 across the lower surface of the holder portion 30. The intermediate part of the first lower surface melt part 53 has a shape shifted to the rear side so as to avoid the embedded part of the capacitor 24. Of the pair of front and rear first lower surface melt portions 53, a second lower surface melt portion 57 described later is connected to the rear first lower surface melt portion 53.

  The second melt part 50S is provided at the rear part of the holder part 30 and extends in the front-rear direction. The second melt part 50 </ b> S is provided so as to continuously surround the entire part located between the adjacent connection parts 23. The second melt part 50S is provided in a double manner on the moisture intrusion path in the left-right direction (width direction of the holder part 30).

  The second melt portion 50S includes a second upper surface melt portion 55 provided on the upper surface of the holder portion 30, a second rear surface melt portion 56 provided on the rear surface, and a second lower surface melt portion 57 provided on the lower surface. I have. Each of the second upper surface melt part 55, the second rear surface melt part 56, and the second lower surface melt part 57 is formed so as to be substantially parallel to each other on the left and right.

  As shown in FIG. 5, the second upper surface melt part 55 is provided on the upper surface of the second partition wall 35. The second upper surface melt part 55 extends in the front-rear direction along the left and right side edges of the second partition wall 35.

  The front end of the second upper surface melt part 55 is continuous with the first upper surface melt part 51. The second upper surface melt portion 55 and the first upper surface melt portion 51 are substantially perpendicular to each other, and the portion of the first upper surface melt portion 51 where the second upper surface melt portion 55 continues (the pair of left and right second upper surface melt portions 55 The part located between them is in a discontinuous form.

  As shown in FIG. 6, the second rear surface melt part 56 hangs substantially vertically from the rear end of the second upper surface melt part 55 to the lower surface of the holder part 30. As shown in FIG. 9, the second rear surface melt part 56 is formed along the left and right side edges of the rear surface of the second partition wall 35.

  As shown in FIG. 7, the second lower surface melt portion 57 extends forward on the lower surface of the holder portion 30 and continues to the lower end of the second rear surface melt portion 56. Most of the second lower surface melt part 57 has a shape shifted to the outside in the one-step width direction from the rear end part.

  The front end of the second lower surface melt part 57 is continuous with the first lower surface melt part 53. The second lower surface melt portion 57 and the first lower surface melt portion 53 are substantially perpendicular to each other, and a portion of the first lower surface melt portion 53 that is continuous with the second lower surface melt portion 57 (of the pair of left and right second lower surface melt portions 57). The part located between them is in a discontinuous form.

  Next, an example of the manufacturing method of the wheel speed sensor S in the present embodiment will be described. The manufacturing method of the wheel speed sensor S includes a sensor component manufacturing process in which the sensor unit 20 is held by the holder unit 30 to manufacture the sensor component P, and a wire connection process in which the electric wire 11 is connected to the connection terminal 22 of the sensor component P. And a resin sealing step in which the sensor component P is resin-sealed by the exterior portion 40.

First, a sensor component manufacturing process is performed. In the sensor component manufacturing process, after the sensor unit 20 is positioned and accommodated in the primary molding die, the synthetic resin is injected into the die and cured to form the holder unit 30. Thereby, the sensor part P in which the sensor unit 20 is embedded in the holder unit 30 and integrated is manufactured.
Next, an electric wire connection process is performed. In the wire connection process, the conductor 12 of the wire 11 of the wire harness 10 is connected to the connection terminal 22 of the sensor component P by a method such as soldering.

  Next, a resin sealing process is performed. In the resin sealing process, the sensor component P, the terminal part of the wire harness 10 and the bracket 43 are positioned in the mold for secondary molding while the terminal part of the wire harness 10 is passed through the insertion hole 44 of the bracket 43. The exterior portion 40 is molded by injecting a synthetic resin into the mold and curing it. The molded exterior rear part 42 is in close contact with the peripheral surface of the insertion hole 44 of the bracket 43 so that the bracket 43 and the exterior part 40 are integrated.

  In the resin sealing step, the melt part 50 melts and adheres closely to the exterior part 40. When the first melt part 50F melts and adheres closely to the exterior part 40, the moisture intrusion path from the connection part 23 to the sensor body 21 side is completely blocked, and the second melt part 50S melts and adheres closely to the exterior part 40. By doing so, the moisture ingress path between the adjacent connecting portions 23 is completely blocked.

Next, the operation and effect of the present embodiment configured as described above will be described.
The wheel speed sensor S in this embodiment includes a sensor component P having a sensor body 20 and a sensor portion 20 having a connection terminal 22 extending from the sensor body 21 and a holder portion 30 for holding the sensor portion 20. Yes. The sensor component P is resin-sealed by the exterior part 40 in a state where the connection terminal 22 is connected to the conductor 12 of the electric wire 11, and between the connection part 23 and the sensor body 21 on the outer surface of the holder part 30. The melt part 50 which melts at the time of shaping | molding of the exterior part 40 is provided in the position which partitions off.

  According to this structure, since the melt part 50 adheres to the exterior part 40 at a position between the connection part 23 of the connection terminal 22 and the sensor main body 21, the moisture that has reached the holder part 30 through the conductor 12 of the electric wire 11. Can be prevented from entering the sensor main body 21 side.

  Further, the melt part 50 is provided at a position that partitions the adjacent connection parts 23 on the outer surface of the holder part 30. According to this structure, since the melt part 50 adheres to the exterior part 40 at a position between the adjacent connection parts 23 in the outer surface of the holder part 30, the moisture that has reached the holder part 30 through the conductor 12 of the electric wire 11. Can be prevented from being short-circuited to the adjacent connection portion 23.

  In addition, the melt part 50 is a rib projecting from the outer surface of the holder part 30, and the protruding end side of the rib has a sharp shape. According to this configuration, since the tip of the melt part 50 is easily melted when the exterior part 40 is molded, the melt part 50 can be securely adhered to the exterior part 40.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the specific formation position of the melt part 50 was illustrated in the said Example, it is not restricted to this, The formation position of a melt part is good also as a thing different from the said Example. Specifically, for example, as shown in FIGS. 12 to 14, the melt portion 50 is formed such that the first upper surface melt portion 51 on the rear side is along the rear edge of the first partition wall 34. Alternatively, the second lower surface melt portion 57 may be along the left and right end edges of the placement portion 33.
(2) In the above embodiment, the sensor component P is formed by insert-molding the holder portion 30 using the sensor portion 20 as an insert product. It may be assembled and integrated.
(3) In the above-described embodiment, the bracket 43 and the exterior part 40 are integrated in the resin sealing process. However, the present invention is not limited thereto. For example, the molded exterior part is formed after the resin sealing process. May be integrated by passing through the insertion hole of the bracket, or the bracket may be molded together with the exterior part in the resin sealing step.
(4) In the said Example, although the moisture-proof material was apply | coated to the hollow part 31, a moisture-proof material does not necessarily need to be apply | coated.
(5) In the above embodiment, the case where the sensor is the wheel speed sensor S has been described. However, the present invention is not limited to this, and the present invention can be applied to various sensors.
(6) In the above embodiment, the melt part 50 includes the first melt part 50F and the second melt part 50S. However, the melt part 50 may not necessarily include the second melt part.
(7) In the above embodiment, the melt part 50 is formed in double, but the melt part does not necessarily have to be formed in double, and may be formed in single or triple.

P ... Sensor parts S ... Wheel speed sensor (sensor)
DESCRIPTION OF SYMBOLS 11 ... Electric wire 12 ... Conductor 20 ... Sensor part 21 ... Sensor main body 22 ... Connection terminal 23 ... Connection part 30 ... Holder part 40 ... Exterior part 50 ... Melt part

Claims (5)

A sensor body having a sensor body and a connection terminal extending from the sensor body;
A holder part for holding the sensor part,
A sensor component that is resin-sealed by an exterior part in a state where the connection terminal is connected to a conductor of an electric wire,
A sensor component in which a melt part that melts during molding of the exterior part is provided at a position that partitions the connection part between the connection terminal of the connection terminal and the sensor body on the outer surface of the holder part.   The sensor component according to claim 1, wherein the melt part is provided at a position that partitions between adjacent connection parts on an outer surface of the holder part.   The sensor component according to claim 1, wherein the melt part is a rib protruding from an outer surface of the holder part, and a protruding end side of the rib has a sharp shape. The sensor component according to any one of claims 1 to 3,
An exterior portion for resin-sealing the sensor component,
A sensor in which the melt part melts and is in close contact with the exterior part. A method for manufacturing the sensor according to claim 4,
A sensor component manufacturing process for manufacturing the sensor component by holding the sensor unit on the holder unit;
A wire connection step of connecting a wire to the connection terminal of the sensor component;
And a resin sealing step of resin-sealing the sensor component with an exterior part,
A method for manufacturing a sensor, wherein the melt part melts in the resin sealing step and comes into close contact with the exterior part.

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