JP4909571B2 - Pressure detector with temperature detection function - Google Patents

Description

  The present invention relates to a pressure detecting device with a temperature detecting function used for detecting an intake temperature and an intake pressure of an automobile, and more particularly to a structure for attaching a temperature sensor element lead portion to a sensor element support pin.

  FIG. 4 and FIG. 5 show an example of this type of pressure detection device with a temperature detection function that is conventionally known (see, for example, Patent Document 1). FIG. 4 is a cross-sectional view showing an overall configuration of a pressure detection device with a temperature detection function according to a known example and a state of attachment to a measurement target part, and FIG. 5 is a temperature sensor of the pressure detection device with a temperature detection function according to a known example. It is principal part sectional drawing which shows the structure of an element setting part and its peripheral part.

  As shown in these drawings, the pressure detection device 1 with a temperature detection function of the present example converts a pressure change of a measured medium into an electric signal and outputs it, and 2 extended from the pressure sensor 2 Four external connection terminals 3 (only one is shown in FIG. 4), a temperature sensor element 4 that converts the temperature change of the medium to be measured into an electrical signal and outputs it, and a lead portion of the temperature sensor element 4 5 are welded to two sensor element support pins 6a and 6b, and two external connection terminals 7 having one ends connected to the two sensor element support pins 6a and 6b (only one is shown in FIG. 4). And a housing 8 that integrally holds these members, an O-ring 9 for shielding provided on the outer peripheral surface of the housing 8, and a cover that is attached to the upper surface opening of the housing 8. 10 mainly.

  As shown in FIG. 4, the housing 8 is inserted into the measured portion 100 and an outer surface setting portion 8 a that is set on the outer surface of the measured portion 100 when attached to the measured portion 100 such as an engine intake pipe, for example. The outer surface setting portion 8a is formed with a setting portion 11 of the pressure sensor 2 and an insertion port 12 of an external connection connector (not shown). The insertion portion 8b has a setting portion 11 of the pressure sensor 2. A pressure introducing hole 13 communicating with the through hole 14, a through hole 14 of the sensor element support pins 6 a and 6 b, a protective wall 15 of the temperature sensor element 4, and a vent 16 formed in the protective wall 15 are formed. The O-ring 9 is provided on the outer surface of the insertion portion 8b.

  As shown in FIG. 5, the temperature sensor element 4 includes a lead portion 5 with respect to a central axis (hereinafter referred to as “central axis of the pressure introduction hole 13”) YY of an insertion portion 8 b provided in the housing 8. The central axis XX of the temperature sensor element 4 is arranged so as to be orthogonal, and the lead portion 5 is spot welded to the tip end portions of the sensor element support pins 6a and 6b extending vertically from the housing 8. .

As shown in FIG. 4, the pressure detection device 1 with a temperature detection function of this example inserts the insertion portion 8 b into the measured portion 100 through the through-hole 101 provided in the measured portion 100 and allows the O-ring 9 to pass through. The hole 101 is attached to the measured portion 100 by being in close contact with the inner surface of the hole 101 and the lower surface of the outer surface setting portion 8 a being in close contact with the outer surface of the measured portion 100.
JP 2004-354294 A

  By the way, this type of pressure detection device with a temperature detection function is attached to an engine intake pipe or the like, which has many layout restrictions, and therefore is strongly required to be downsized.

  However, in the pressure detection device with a temperature detection function according to the known example, the central axis XX of the temperature sensor element 4 including the lead portion 5 is arranged orthogonal to the central axis YY of the pressure introducing hole 13. Therefore, there is a problem that it is difficult to reduce the diameter of the insertion portion 8b and it is difficult to meet the demand for downsizing.

  If the central axis XX of the temperature sensor element 4 including the lead portion 5 is inclined or parallel to the central axis YY of the pressure introducing hole 13, the diameter of the insertion portion 8b can be reduced. However, simply changing the mounting angle of the temperature sensor element 4 including the lead part 5 with respect to the central axis YY of the pressure introducing hole 13 reduces the connection reliability of the lead part 5 to the sensor element support pins 6a, 6b. May adversely affect durability.

  That is, when the central axis XX of the temperature sensor element 4 including the lead portion 5 is inclined with respect to the central axis YY of the pressure introducing hole 13, the hatching in FIG. As shown, since the change in the area of the welded portion between the sensor element support pins 6a and 6b and the lead portion 5 generated in response to the setting error of the central axis XX with respect to the central axis YY increases, the central axis Y- Even if the specific inclination angle with respect to Y is set as the attachment angle of the temperature sensor element 4 and the optimum spot welding condition is set according to the area of the welded portion at the inclination angle, the attachment angle of the temperature sensor element 4 is set. When an error occurs, optimum spot welding becomes difficult, connection reliability is lowered, and durability of the pressure detection device with a temperature detection function is deteriorated. On the other hand, if the inclination angle of the central axis XX with respect to the central axis YY is regulated with high accuracy during spot welding, such inconvenience can be avoided, but the temperature sensor element 4 with respect to the sensor element support pins 6a and 6b. The work efficiency required for positioning is reduced, and the pressure detection device with a temperature detection function increases in cost.

  The present invention has been made in view of the actual state of the prior art, and an object of the present invention is to provide a pressure detection device with a temperature detection function that is small and inexpensive and has excellent reliability and durability.

To solve the above problems, the present invention is not only set in the direction to tilt the central axis of the temperature sensor element includes a lead portion with respect to the central axis of the pressure introducing hole formed in the housing, the welding Take measures to stabilize and facilitate manufacturing.

Specifically, according to the present invention, first, a pressure sensor that converts a pressure change of a measured medium into an electric signal and outputs the electric signal, and a temperature sensor element that converts a temperature change of the measured medium into an electric signal and outputs the electric signal. And two sensor element support pins to which the lead part of the temperature sensor element is welded, and a housing having a pressure introducing hole communicating with the protective wall of the temperature sensor element and the setting part of the pressure sensor In the pressure detecting device with a function, the tip end portion of the sensor element support pin is set in a direction in which the central axis of the temperature sensor element is inclined with respect to the central axis of the housing, and a lead portion of the temperature sensor element is welded Is bent in a direction in which the crossing angle with the lead portion of the temperature sensor element is orthogonal .

  According to a second aspect of the present invention, in the first pressure detection device with a temperature detection function, the sensor element support pin and a lead portion of the temperature sensor element are substantially orthogonal to each other at the welded portion.

  Thirdly, in the first pressure detection device with a temperature detection function according to the present invention, the width of the tip of the sensor element support pin is less than twice the width of the lead, and the tip Further, the lead portion is welded.

  Fourthly, in the first pressure detection device with a temperature detection function according to the present invention, the length of the lead portion from the end portion of the temperature sensor element to the welded portion with the sensor element support pin is set to 5 mm or less. It is characterized by that.

  Fifth, in the first pressure detection device with a temperature detection function according to the present invention, the ventilation having a shape and size that allows the entire temperature sensor element including the lead portion to be exposed to the medium to be measured on the protective wall. It is characterized by having a mouth.

  Sixthly, the present invention is characterized in that, in the first pressure detecting device with a temperature detecting function, the pressure introducing hole is provided between the two sensor element support pins.

  Seventhly, the present invention is characterized in that, in the first pressure detecting device with a temperature detecting function, a peripheral wall having a height of 2 mm or more is formed around the inlet of the pressure introducing hole.

  In the pressure detecting device with a temperature detecting function of the present invention, the central axis of the temperature sensor element is inclined or parallel to the central axis of the pressure introducing hole, so that the temperature sensor element of the pressure introducing hole is directed to the central axis of the pressure introducing hole. The insertion portion of the housing can be reduced in diameter compared to the case where the central axes are orthogonal. In addition, since the tip of the sensor element support pin to which the lead portion of the temperature sensor element is welded is bent in a direction in which the crossing angle with the lead portion of the temperature sensor element becomes large, the predetermined center axis of the pressure introducing hole is Even if the mounting angle of the temperature sensor element slightly deviates from the set angle of the temperature sensor element, the change in the area of the welded portion between the sensor element support pin and the lead can be reduced, and the sensor element is always supported under the optimum spot welding conditions. The welded portion between the pin and the lead portion can be welded, and the connection reliability of the welded portion, and thus the durability of the pressure detecting device with a temperature detecting function can be enhanced. Furthermore, since there is no need to precisely control the center axis of the temperature sensor element with respect to the center axis of the pressure introducing hole during spot welding, the temperature sensor element positioning operation can be made more efficient, and the pressure detection device with a temperature detection function Can be manufactured at high efficiency and at low cost.

  Hereinafter, an embodiment of a pressure detection device with a temperature detection function according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of a main part of a pressure detection device with a temperature detection function according to a first embodiment, FIG. 2 is a cross-sectional view of a main part of a pressure detection device with a temperature detection function according to a second embodiment, and FIG. It is principal part sectional drawing of the pressure detection apparatus with a temperature detection function which concerns on 3 example of embodiment. In these drawings, the same reference numerals as those in FIG.

  As shown in FIG. 1, in the pressure detection device 1 </ b> A with a temperature detection function according to the first embodiment, the central axis XX of the temperature sensor element 4 is inclined with respect to the central axis YY of the pressure introduction hole 13. Set to direction. The inclination angle θ of the central axis XX with respect to the central axis YY is desirably an arbitrary angle of 70 degrees or less. This is because when the inclination angle θ exceeds 70 degrees, a remarkable effect cannot be expected with respect to the diameter reduction of the insertion portion 8b. By adopting such a configuration, the pressure detection device 1A with a temperature detection function of this example can reduce the diameter of the insertion portion 8b of the housing 8 compared to the conventional pressure detection device 1 with a temperature detection function shown in FIG. It is possible to facilitate attachment to the measured part.

  Two sensor element support pins 6a and 6b extending vertically from the housing 8 have welds 6c that are inclined at an angle of (90 + θ) degrees with respect to the central axis YY of the pressure introducing hole 13 at the tip ends of the sensor element support pins 6a and 6b. Are formed in the same direction, and the lead portion 5 of the temperature sensor element 4 is spot-welded to the weld portion 6c. As a result, the central axis XX of the temperature sensor element 4 can be inclined at an angle θ with respect to the central axis YY of the pressure introducing hole 13, and the sensor element support pins 6 a and 6 b and the lead portion 5 of the temperature sensor element 4. Can be made orthogonal at the welded portion 6c, so that even if the mounting angle of the temperature sensor element 4 is slightly deviated from a predetermined set angle θ, the sensor element support pins 6a, 6b and the lead portion 5 are welded. The area change of the part can be reduced, and each welded part can be stably welded under a predetermined optimum spot welding condition. Further, since there is no need to regulate the center axis XX of the temperature sensor element 4 with respect to the center axis YY of the pressure introducing hole 13 at the time of spot welding, the positioning operation of the temperature sensor element 4 can be made efficient. It is possible to improve the productivity and reduce the cost of the pressure detection device with a temperature detection function.

  The width C1 of the welded portion 6c formed at the tip of the sensor element support pins 6a and 6b is preferably less than twice the width C2 of the lead portion 5. Thus, by making the ratio of the width dimensions of the two or less, the difference in heat capacity between the two in the welded portion can be within an allowable range, so that high-quality spot welding can be performed.

  On the other hand, the length D of the lead portion 5 from the end of the temperature sensor element 4 to the welded portion between the sensor element support pins 6a and 6b is preferably 5 mm or less. In this way, if the length of the lead portion 5 is regulated, the natural frequency of the entire temperature sensor system including the sensor element support pins 6a and 6b can be increased. Can increase the sex.

  A vent 16 having a shape and size that allows the entire temperature sensor element 4 including the lead portion 5 to be exposed to the medium to be measured is opened in the protective wall 15. Thereby, the output responsiveness of the temperature sensor element 4 can be accelerated, and the spot welding between the sensor element support pins 6a and 6b and the lead portion 5 can be facilitated.

  The pressure introduction hole 13 is provided between the two through holes 14 that hold the sensor element support pins 6a and 6b. Thereby, the pressure loss caused by the resistance of the sensor element support pins 6a and 6b can be minimized without being influenced by the flow direction of the medium to be measured, so that the output response of the pressure sensor 2 can be accelerated. it can.

  Further, a peripheral wall 13a for preventing fouling is provided around the inlet side of the pressure introducing hole 13. The height E of the peripheral wall 13a is desirably 2 mm or more. As described above, when the peripheral wall 13 a having a predetermined height is provided around the inlet side of the pressure introduction hole 13, the oil or the like transmitted through the inner wall of the housing 8 enters the pressure introduction hole 13 and the pressure introduction hole 13 associated therewith. Therefore, the fouling resistance of the pressure detection device with a temperature detection function can be improved.

  Since the configuration of the other parts is equivalent to the pressure detection device with a temperature detection function according to the known example shown in FIGS. 4 and 5, the description thereof is omitted.

  Next, the 2nd example of the pressure detection apparatus with a temperature detection function which concerns on this invention is demonstrated based on FIG. The pressure detection device 1B with a temperature detection function of this example is characterized in that the central axis XX of the temperature sensor element 4 is arranged in parallel to the central axis YY of the pressure introducing hole 13.

  In the pressure detection device with a temperature detection function of this example, as shown in FIG. 2, the welded portion 6 c formed at the tip of each sensor element support pin 6 a, 6 b is connected to the central axis YY of the pressure introduction hole 13. It is formed in the direction orthogonal to. The other parts are the same as those of the pressure detecting device with temperature detecting function 1A according to the first embodiment, so that the corresponding parts are denoted by the same reference numerals in order to avoid duplication, and the description thereof is omitted.

  In the pressure detection device 1B with a temperature detection function of the present example, the central axis XX of the temperature sensor element 4 is arranged in parallel to the central axis YY of the pressure introducing hole 13, so that FIGS. As is clear from the comparison of 5, the insertion portion 8b of the housing 8 can be made the smallest in diameter.

  Next, the 3rd example of the pressure detection apparatus with a temperature detection function which concerns on this invention is demonstrated based on FIG. The pressure detection device 1C with a temperature detection function of this example is characterized in that the insertion portion 8b of the housing 8 has a divided structure, and the spot welding of the sensor element support pins 6a and 6b and the lead portion 5 is facilitated.

  That is, in the pressure detection device 1C with a temperature detection function of the present example, the insertion portion 8b of the housing 8 is composed of a base portion 81 and a connection portion 82, and the connection portion 82 includes a part of the pressure introduction hole 13 and A part of the through hole 14, a protective wall 15 of the temperature sensor element 4, and a vent 16 formed in the protective wall 15 are formed. The connecting portion 82 is formed to have a length that covers at least the welded portion between the sensor element support pins 6a and 6b and the lead portion 5, and is fixed to the lower surface of the base 81 after spot welding of the welded portion is completed.

  By doing so, spot welding of the sensor element support pins 6a, 6b and the lead portion 5 can be performed with the connecting portion 82 removed, so that the diameter of the insertion portion 8b of the housing 8 is reduced, and as a result, the housing 8 enters the housing 8. Therefore, the required spot welding can be performed efficiently, and the productivity of the pressure detecting device with a total temperature detecting function can be increased.

  In each of the above embodiments, the sensor element support pins 6a and 6b and the lead portion 5 of the temperature sensor element 4 are orthogonal to each other at the welded portion. A mounting error of about 10 degrees is allowed.

It is principal part sectional drawing of the pressure detection apparatus with a temperature detection function which concerns on the example of 1st Embodiment. It is principal part sectional drawing of the pressure detection apparatus with a temperature detection function which concerns on the example of 2nd Embodiment. It is principal part sectional drawing of the pressure detection apparatus with a temperature detection function which concerns on the example of 3rd Embodiment. It is sectional drawing which shows the whole structure of the pressure detection apparatus with a temperature detection function which concerns on a well-known example, and the attachment state to a to-be-measured part. It is principal part sectional drawing which shows the structure of the temperature sensor element setting part of the pressure detection apparatus with a temperature detection function which concerns on a well-known example, and its peripheral part. It is explanatory drawing which shows the inconvenience which arises when only a temperature sensor element is inclined.

Explanation of symbols

1A, 1B, 1C Pressure detection device with temperature detection function 2 Pressure sensor 4 Temperature sensor element 5 Lead portion 6a, 6b Sensor element support pin 8 Housing 13 Pressure introduction hole 14 Through hole of sensor element support pin 15 Protection wall of temperature sensor element 16 Vent

Claims (7)

A pressure sensor that converts a pressure change of the measured medium into an electric signal and outputs the electric signal, a temperature sensor element that converts a temperature change of the measured medium into an electric signal and outputs the electric signal, and a lead portion of the temperature sensor element are welded In the pressure detection device with a temperature detection function, comprising two sensor element support pins and a housing having a pressure introducing hole communicating with a protective wall of the temperature sensor element and a setting portion of the pressure sensor,
The central axis of the temperature sensor element is set to be inclined with respect to the central axis of the housing, and the tip of the sensor element support pin to which the lead part of the temperature sensor element is welded is the lead of the temperature sensor element. A pressure detection device with a temperature detection function, characterized in that the crossing angle with the section is bent in a direction that is orthogonal .   The pressure detection device with a temperature detection function according to claim 1, wherein the sensor element support pin and a lead portion of the temperature sensor element are substantially orthogonal to each other at a welded portion thereof.   2. The pressure detecting device with a temperature detecting function according to claim 1, wherein a width dimension of a tip portion of the sensor element support pin is formed to be not more than twice a width dimension of the lead portion, and the lead portion is welded to the tip portion. A pressure detection device with a temperature detection function.   The pressure detection device with a temperature detection function according to claim 1, wherein a length of the lead portion from an end portion of the temperature sensor element to a welded portion with the sensor element support pin is set to 5 mm or less. Pressure detector with temperature detection function.   The pressure detection device with a temperature detection function according to claim 1, wherein a vent hole having a shape and a size capable of exposing the entire temperature sensor element including the lead portion to the medium to be measured is provided in the protective wall. A pressure detector with a temperature detection feature.   The pressure detection device with a temperature detection function according to claim 1, wherein the pressure introduction hole is provided between the two sensor element support pins.   The pressure detection device with a temperature detection function according to claim 1, wherein a peripheral wall having a height of 2 mm or more is formed around the inlet of the pressure introduction hole.

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