JP2013217709A - Measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the measuring accuracy by increasing the location accuracy of a sensor part for a measuring place in a measuring apparatus which arranges the sensor part at the measuring place by a lead wire.SOLUTION: An in-take air temperature sensor 1 (an example of the measuring apparatus) arranged at the outside of an AFM 6 has a sensor part 2 arranged at a measuring place α by a lead wire 3. The side surface of a resin housing which forms a bypass passage in the AFM 6 is provided with an intermediate support body 4 for supporting a middle part of the lead wire 3. The middle part of the lead wire 3 is supported by press-fitting by a press-fitting holding part provided in the middle part supporting body 4. Thus, the support accuracy of the middle part of the lead wire 3 can be increased, and the location accuracy of the sensor part 2 in the measuring place 3 can be increased. As a result, the measuring accuracy of the in-take air temperature sensor 1 can be increased.

Description

  The present invention relates to a measuring apparatus that arranges a sensor portion at a measurement location by a lead wire.

A measuring device in which a sensor unit is arranged at a measurement location by a lead wire is known.
However, if the distance from the part to which the end of the lead wire is electrically connected (sensor circuit, terminal terminal, etc.) to the measurement location where the sensor unit is placed is long, the long lead wire can improve the placement accuracy of the sensor unit. Variations increase.

Then, the position accuracy of the sensor unit with respect to the measurement location deteriorates, and the measurement error increases.
In addition, when the sensor unit is supported via a long lead wire, the vibration width of the sensor unit increases due to vibration, and a problem that the vibration width of the sensor unit is amplified by resonance occurs.

In view of this, a technique for supporting an intermediate portion of the lead wire with an intermediate support has been proposed (see, for example, Patent Document 1).
In the intermediate support disclosed in Patent Document 1, a middle portion of a lead wire is housed in a wide recess provided in the intermediate support, and then the open end of the wide recess is closed by heat caulking.

However, after the lead wire is halfway inside the wide concave portion, the open end of the wide concave portion is closed by thermal caulking, and the support accuracy of the intermediate portion of the lead wire is low.
If the support accuracy of the intermediate portion of the lead wire is low, the position accuracy of the sensor unit supported via the lead wire is also greatly deteriorated.
As a result, even if the technique of Patent Document 1 is used, there is a concern that the variation in the position of the sensor unit with respect to the measurement location becomes large and the measurement accuracy deteriorates.

JP 2011-232343 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the positional accuracy of the sensor unit with respect to the measurement location in the measurement device in which the sensor unit is arranged at the measurement location with a lead wire. The object is to provide a high measuring device.

The measuring apparatus according to the present invention supports an intermediate portion of a lead wire with an intermediate support, and a press-fitting and holding portion for supporting the lead wire by press-fitting on the intermediate support.
As described above, the press-fitting and holding portion provided in the intermediate support supports the lead wire by press-fitting, so that the support accuracy of the intermediate portion of the lead wire can be increased.
Thereby, the positional accuracy of the sensor part supported via a lead wire can be made high. That is, the position accuracy of the sensor unit at the measurement location can be increased. As a result, the measurement accuracy by the sensor unit can be increased.

(A) Side view of AFM, (b) Front view of AFM (Example 1). (Example 1) which is explanatory drawing which assembles a lead wire to a press-fit clamping part. (Example 1) which is explanatory drawing of a heat crimp. (Example 2) which is explanatory drawing which assembles a lead wire to a press fit clamping part.

Embodiments of the present invention will be described with reference to the drawings.
A measuring device (an intake air temperature sensor in an embodiment described later) 1 includes a sensor unit 2 disposed at a predetermined measurement location α and a lead wire 3 extending from the sensor unit 2, and the sensor unit 2 is connected to the lead wire 3. A structure arranged at the measurement location α is adopted.
The measuring apparatus 1 includes an intermediate support 4 that supports a midway portion of the lead wire 3, and the intermediate support 4 is provided with a press-fitting and clamping unit 5 that supports the lead wire 3 by press-fitting. The press-fitting and clamping unit 5 supports the lead wire 3 by press-fitting, so that the support accuracy of the intermediate portion of the lead wire 3 is increased, and as a result, the position accuracy of the sensor unit 2 supported via the lead wire 3 is increased. (Position accuracy of the sensor unit 2 at the measurement location α) can be increased.

Hereinafter, a specific example (example) to which the present invention is applied will be described with reference to the drawings. The embodiment discloses a specific example, and it goes without saying that the present invention is not limited to the embodiment.
In the following embodiments, the same reference numerals as those in the above-mentioned [Mode for Carrying Out the Invention] indicate related functional objects.

[Example 1]
Embodiment 1 will be described with reference to FIGS.
In this embodiment, the present invention is applied to an intake air temperature sensor 1 mounted on an AFM (air flow meter) 6.

The AFM 6 for measuring the intake flow rate sucked into the engine is a well-known one.
(A) a passage forming member (passage forming housing) 7 that forms a flow rate measuring passage (bypass passage or the like) inside;
(B) a flow rate detection unit (a detection means (not shown using a chip type or bobbin type resistor)) that is assembled in the passage forming member 7 and measures the air flow rate passing through the flow rate measurement passage;
It is configured with.

The AFM 6 is disposed in an intake duct 8 in which the passage forming member 7 guides intake air to the engine, and the intake air flow rate (the flow rate detected by the flow rate detection unit) passing through the inside of the passage forming member 7 (flow rate measurement passage). The flow rate of the intake air sucked into the engine is measured based on the air intake, and the air intake (inlet of the bypass passage) 7 a provided in the passage forming member 7 is directed upstream in the intake duct 8. It is fixedly arranged inside the intake duct 8.
Specifically, an AFM mounting hole penetrating the inside and the outside is formed in the side surface of the intake duct 8. After the passage forming member 7 is inserted and arranged in the intake duct 8 from the outside of the AFM mounting hole, the AFM mounting hole is formed. A lid portion (lid portion forming housing) 9 is closed to the intake duct 8 using a fixing means such as a tapping screw.

The lid portion 9 includes a connector 9a for ECU (engine control unit) connection, and the passage forming member 7 and the lid portion 9 are integrally provided by a common resin material.
In the following, for explanation of the embodiment,
The direction of intake air flow in the intake duct 8 is the X axis,
The direction perpendicular to the X axis is the Y axis,
A direction perpendicular to the X axis and Y axis (insertion direction of the passage forming member 7) is the Z axis,
-One side surface along the flow direction of the intake air in the passage forming member 7 is the A surface,
Called.

The intake air temperature sensor 1 that measures the intake air temperature is disposed outside the passage forming member 7 and detects the temperature of the intake air flowing through the intake duct 8 (that is, the temperature of the intake air sucked into the engine). ,
A sensor unit 2 disposed at a hollow measurement location α that is a predetermined amount away from the A surface;
Two lead wires 3 extending from the sensor unit 2;
It is configured with.

The sensor unit 2 and the two lead wires 3 constitute one thermistor component. That is, one thermistor component is well-known, and is provided by a sensor portion 2 whose resistance value changes according to a temperature change, and a lead wire 3 having a circular cross section extending from both sides of the sensor portion 2. is there. The lead wire 3 is a general one and is provided by a single metal wire that keeps a bent state when bent.
Then, both ends of the lead wires 3 (ends on the side away from the sensor unit 2) are connected to other electrical components (for example, a sensor circuit, a terminal terminal, etc.) disposed inside the lid unit 9. Is.

(Feature Technology 1 of Example 1)
The measurement location α where the sensor unit 2 is arranged is set to a portion where the disturbance of the intake air flow is small for the purpose of improving the measurement accuracy. For this reason, the measurement location α is provided at a position away from the lid 9 (the component to which the end of each lead wire 3 is connected).
Therefore, the intake air temperature sensor 1 uses the lead wire 3 to arrange the sensor unit 2 at a measurement location α at a position away from the lid unit 9.
However, if the distance from the lid portion 9 to the measurement location α where the sensor unit 2 is arranged is long, variation in the arrangement accuracy of the sensor unit 2 due to the long lead wire 3 increases, and the fluctuation width of the sensor unit 2 due to resonance or the like. Will become bigger.

Therefore, in this embodiment, the intermediate portion of the two lead wires 3 is supported using the two intermediate supports 4.
The intermediate support 4 in this embodiment is provided by a part of the resin member constituting the passage forming member 7 and is provided in a convex shape protruding in the Y-axis direction from the A surface of the passage forming member 7.

The intermediate support 4 supports the lead wire 3 by press-fitting, and the intermediate support 4 is provided with a press-fitting sandwiching portion 5 that supports a midway portion of the lead wire 3 by press-fitting.
Further, the intermediate support 4 of this embodiment includes a funnel portion 10 that guides the lead wire 3 to the press-fitting and holding portion 5 in addition to the press-fitting and holding portion 5.

  Although the shape of the press-fitting sandwiching part 5 is not limited, as a specific example, the press-fitting sandwiching part 5 of this embodiment includes a straight parallel part 5a that sandwiches the lead wire 3 from both sides as shown in FIG. And a bottomed portion 5b orthogonal to the straight parallel portion 5a. In addition, the linear parallel part 5a is provided in the linear shape along the Y-axis direction, and the bottomed part 5b is provided in the linear shape along the X-axis direction. The distance between the straight parallel portions 5 a is set to be narrower than the diameter of the lead wire 3.

  The funnel 10 guides the lead wire 3 from the tip of the intermediate support 4 toward the press-fitting and clamping portion 5, and the opening width at the end of the intermediate support 4 is at least wider than the diameter of the lead 3. It has a substantially V-shape.

As shown in FIG. 2B, first, the lead wires 3 are inserted into the respective funnel portions 10 as shown in FIG.
Subsequently, the lead wire 3 inserted into the funnel portion 10 is pushed in until the lead wire 3 reaches the bottomed portion 5b. As a result, as shown in FIG. 2C, the lead wire 3 reaches the bottomed portion 5b of the press-fitting sandwiching portion 5, and the lead wire 3 is fixed to the linear parallel portion 5a by press-fitting.

in this way,
-The lead wire 3 is sandwiched between the straight parallel parts 5a, so that the intermediate portion of the lead wire 3 is supported with high accuracy in the X-axis direction,
-When the lead wire 3 reaches the bottomed portion 5b, a midway portion of the lead wire 3 is supported with high accuracy in the Y-axis direction.
That is, by press-fitting the lead wire 3 into the press-fitting sandwiching portion 5, the intermediate portion of the lead wire 3 is supported with high accuracy in the X-axis direction and the Y-axis direction.

(Effect of Feature Technology 1)
In the intake air temperature sensor 1 of this embodiment, as described above, the intermediate portion of the lead wire 3 is supported by the intermediate support 4, and the lead wire 3 is supported by press-fitting by the press-fitting clamping portion 5 provided in the intermediate support 4. To do.
As described above, the press-fitting and clamping portion 5 of the intermediate support 4 supports the lead wire 3 by press-fitting, so that the support accuracy of the intermediate portion of the lead wire 3 can be increased. Specifically, as described above, the intermediate portion of the lead wire 3 can be supported with high accuracy in the X-axis direction and the Y-axis direction.

  Thereby, the positional accuracy of the sensor part 2 supported via the lead wire 3 can be made high. That is, the sensor unit 2 can be arranged with high accuracy with respect to a preset measurement location α. As a result, the measurement accuracy of the intake air temperature measured by the sensor unit 2 can be increased, and the reliability of the intake air temperature sensor 1 can be increased.

  Further, since the intermediate portion of the lead wire 3 is supported by the intermediate support body 4, the vibration width of the sensor unit 2 supported by the lead wire 3 can be kept small even when subjected to vibration or the like, and resonance is prevented. Thus, it is possible to avoid the problem that the fluctuation width of the sensor unit 2 increases due to resonance.

(Feature Technology 2 of Example 1)
The feature technique 2 of this embodiment will be described with reference to FIG.
This example is
As shown in FIG. 3A, after the lead wire 3 is press-fitted into the press-fitting sandwiching part 5,
-As shown in FIG.3 (b), the lead wire 3 is fixed to the press-fitting clamping part 5 by the heat crimping (beta).

  Specifically, the intermediate support 4 is provided by a part of the resin forming the passage forming member 7 as described above. Then, after the lead wire 3 is press-fitted into the press-fitting and sandwiching part 5, the open end (the tip part of the intermediate support 4) of the press-fitting and sandwiching part 5 is melted and pressed by a heat caulking means to form a heat caulking β. The lead wire 3 is embedded in the intermediate support 4 by the formed heat caulking β.

(Effect of Feature Technology 2)
In the intake air temperature sensor 1 of this embodiment, as described above, after the lead wire 3 is press-fitted into the press-fitting sandwiching portion 5, the lead wire 3 is embedded in the intermediate support 4 by thermal caulking β. There is no possibility of detachment from the clamping part 5.
Thereby, even if a large impact or vibration is applied, there is no concern that the lead wire 3 is detached from the press-fitting and clamping portion 5, and the reliability of the intake air temperature sensor 1 with respect to the impact or vibration can be improved. That is, the reliability of the AFM 6 including the intake air temperature sensor 1 can be improved.

[Example 2]
Embodiment 2 will be described with reference to FIG. In the following embodiments, the same reference numerals as those in the first embodiment indicate the same functional objects.
In the first embodiment, an example in which the press-fitting sandwiching portion 5 is provided by the straight parallel portion 5a sandwiching the lead wire 3 from both sides and the bottomed portion 5b orthogonal to the straight parallel portion 5a is shown.
On the other hand, in the second embodiment, the press-fitting and sandwiching portion 5 is provided by a bottomed arc-shaped portion 5c that sandwiches the lead wire 3 from both sides. The inner diameter dimension of the arc-shaped portion 5 c is the same as the outer diameter dimension of the lead wire 3 or slightly smaller than the outer diameter dimension of the lead wire 3 so as to always contact the outer diameter of the lead wire 3. It is.

And between the funnel part 10 and the press-fitting clamping part 5, a press-fitting resistance part 5d narrower than the diameter of the lead wire 3 is provided. This press-fit resistance portion 5d is a retainer, and holds the lead wire 3 pushed into the arc-shaped portion 5c in the arc-shaped portion 5c.
Even if it provides in this way, the same effect as Example 1 can be acquired.

  The shape of the press-fitting and clamping unit 5 shown in the above embodiment is not limited, and may be another shape that can press-fit the lead wire 3 such as a V shape.

  In the above embodiment, the example in which the intermediate support 4 is provided with resin (in the embodiment, resin that forms the passage forming member 7) is shown. However, the present invention is not limited, and for example, an insulating member (resin material or the like) is used. The intermediate support 4 may be provided by a metal material that is insulated and supported.

  In the above embodiment, the example in which the present invention is applied to the intake air temperature sensor 1 mounted on the AFM 6 has been described. However, the present invention may be applied to another intake air temperature sensor 1 that is not mounted on the AFM 6.

  In the above embodiment, an example in which the present invention is applied to the intake air temperature sensor 1 is shown as an example of a measuring device. However, the measurement target is not limited to the intake air temperature, and other gas temperatures or liquids different from the intake air The present invention may be applied to a temperature sensor that detects temperature.

  In the above-described embodiment, an example in which the present invention is applied to a measuring device that measures temperature (intake air temperature sensor 1 in the embodiment) is shown. However, the measurement target is not limited to temperature. The present invention may be applied to measurement devices (sensors) that measure other things such as concentration.

1 Intake air temperature sensor (example of measuring device)
2 Sensor part 3 Lead wire 4 Intermediate support 5 Press-fitting clamping part α Measurement location

Claims (5)

A sensor unit (2) disposed at a predetermined measurement location (α), and a lead wire (3) extending from the sensor unit (2);
In the measuring device (1) in which the sensor unit (2) is arranged at the measurement location (α) by the lead wire (3),
The measuring device (1) includes an intermediate support (4) that supports a midway portion of the lead wire (3) and places the sensor unit (2) at the measurement location (α).
The intermediate support (4) includes a press-fitting and clamping part (5) for supporting the lead wire (3) by press-fitting. The measuring device (1) according to claim 1,
The said press-fitting clamping part (5) is equipped with the linear parallel part (5a) and the bottomed part (5b) which clamp the said lead wire (3) from both sides, The measuring apparatus characterized by the above-mentioned. The measuring device (1) according to claim 1,
The measuring apparatus according to claim 1, wherein the press-fitting and sandwiching portion (5) includes a bottomed arc-shaped portion (5c) that sandwiches the lead wire (3) from both sides. In the measuring device (1) according to any one of claims 1 to 3,
The intermediate support (4) is provided by a resin material,
The said press-fitting clamping part (5) is fixing the said lead wire (3) by heat crimping ((beta)), after press-fitting the said lead wire (3). In the measuring device (1) according to any one of claims 1 to 4,
This measuring device (1) is an intake temperature sensor that is disposed outside an AFM (6) that is disposed inside an intake duct (8) that guides intake air to the engine and detects the temperature of intake air that is sucked into the engine. ,
The said intermediate support body (4) is provided with a part of resin member which comprises the said AFM (6), The measuring apparatus characterized by the above-mentioned.

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