JP4631844B2 - Pressure gauge - Google Patents

Description

  The present invention relates to a pressure gauge assembled by caulking that joins a sensor housing made of metal and a connector housing made of resin by bending a protrusion or an end of the sensor housing.

As said pressure gauge, what is described in the following published patent publication "semiconductor pressure detector and its manufacturing method" etc. are generally known, for example.
Japanese Patent Laid-Open No. 7-209115

  FIG. 10 shows a cross-sectional view of the pressure gauge 900 according to the above prior art. As shown in FIG. 10, in the prior art, the connector housing 1 (resin member) in which the terminal pins (2a, 2b) and the like are insert-molded is directly bent at the protrusion or end of the sensor housing 3 (metal member). Thus, the pressure gauge is assembled by so-called caulking that joins and fixes the two.

However, the configuration of the conventional pressure gauge that directly caulks the connector housing 1 has the following problems.
(Problem 1) When the caulking is performed, excessive stress is applied to the joint portion of the connector housing 1 made of a resin member (the contact surface on which the protruding portion or the end portion of the sensor housing 3 abuts). May be deformed or damaged.

(Problem 2) Since the high-pressure sealed liquid 13 is sealed in the connector housing 1, a large compressive stress is applied to the joint portion of the connector housing 1 when the pressure gauge 900 is used, and deformation or deflection occurs.

  In addition, as a method for solving these problems, for example, a method such as increasing the area of the joint portion of the connector housing 1 is conceivable. However, in this method, the pressure gauge becomes large as a whole, Downsizing of the pressure gauge is hindered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to realize a small pressure gauge that can be used even at a high pressure.

In order to solve the above problems, the following means are effective.
That is, the first means is a connector housing made of metal and having a pressure introduction hole, and a pressure sensitive element made of resin and applied with a pressure to be measured introduced from the pressure introduction hole. preparative a pressure gauge assembled by caulking joining by bending the protruding portion or the end portion of the sensor housing, it constitutes a shoulder of the connector housing as the joint portion of the caulking a metal plate-ring-shaped metal plate In the pressure gauge formed integrally with the connector housing, the metal plate has a ring-shaped first portion to be a caulking joint, and is continuous with the first portion in the thickness direction of the metal plate. consists of a second portion of the ring shape having a diameter smaller than the diameter of the portion, cotton in the second portion, the inner peripheral one round of the ring-shaped, or one round outer periphery Te, and the resin integrally molded connector housing is fitted with the resin, a series of grooves so as not to cause a gap by shrinkage of the resin between the bottom surface and the resin, mountains, or, further comprising a concavo-convex structure This is a pressure gauge.

The second means is a connector housing formed of a metal and having a pressure introduction hole, and a pressure sensitive element formed of a resin and applied with a pressure to be measured introduced from the pressure introduction hole. Is a pressure gauge that is assembled by caulking by bending the protrusions or ends of the sensor housing, and the shoulder of the connector housing, which is the caulking joint, is composed of a substantially ring-shaped metal plate. In the pressure gauge formed integrally with the connector housing, the metal plate has a ring-shaped first portion to be a caulking joint, and is continuous with the first portion in the thickness direction of the metal plate. consists of a second portion of the ring shape having a diameter smaller than the diameter of the portion, the second portion, the inner peripheral one round of the ring-shaped, and, in one round outer periphery It, and the resin integrally molded connector housing is fitted with the resin, a series of grooves so as not to cause a gap by shrinkage of the resin between the bottom surface and the resin, mountains, or, further comprising a concavo-convex structure It is a pressure gauge characterized by.

  The above-described problems can be solved by the above means.

  According to the means of the present invention, when the above caulking is carried out, the shoulder portion of the connector housing, which becomes the caulking joint, is made of a metal plate, so that the pressure resistance is greatly improved. Will not be deformed or damaged. Since these improvements in pressure-resistant strength make it difficult for deformation and bending to occur, the pressure gauge of the present invention can be used even at high pressures.

  In addition, according to the means of the present invention, a series of grooves, peaks, or concavo-convex structures that fit into a part of the connector housing are provided over the inner ring or the outer circumference of the substantially ring shape of the metal plate. When the resin is integrally molded, resin sink marks (gap between the metal plate generated by the resin shrinking with a temperature drop) that can be generated on the bottom surface of the metal plate are prevented.

  Thereby, when the pressure gauge is mounted on a vehicle or the like, metal fatigue of the bonding wire due to the vibration of the resin generated by this sink (gap) is reduced, and the reliability and durability of the pressure gauge are improved.

  Hereinafter, the present invention will be described based on specific examples.

  FIG. 1 is a side view of a pressure gauge 100 according to the first embodiment. In the present pressure gauge 100, a sensor housing 3 made of metal and a connector housing 1 made of resin are assembled by so-called caulking by bending an end 3a of the sensor housing 3. Reference numeral 1 a denotes a neck portion of the connector housing 1, and reference numeral 1 b denotes a stopper for insertion connection provided in the connector housing 1.

  FIG. 2 shows a cross-sectional view of the pressure gauge 100. A shoulder portion 1 c of the connector housing 1 located below the neck portion 1 a of the connector housing 1 is constituted by a ring-shaped metal plate 101 that reinforces the connector housing 1. The terminal pins 2 a and 2 b connected to the pressure sensitive element 5 extend to the upper part of the connector housing 1 through the hole H of the metal plate 101.

The end portion 3 a of the sensor housing 3 is crimped so that pressure is applied to the entire bottom surface A of the metal plate 101 substantially evenly by being bent inward over the entire circumference of the metal plate 101.
The pressure input from the pressure introduction hole 3b is transmitted to the pressure sensitive element 5 via the seal diaphragm 7, the sealing liquid (pressure transmission medium) 13, and the like. The pressure sensitive element 5 outputs an electric signal corresponding to the magnitude of the pressure to the terminal pin via the bonding wire 12. Reference numeral 8 denotes an O-ring (airtight member).

  In FIG. 3, the front view of this pressure gauge 100 is shown. Also from FIG. 3, it can be seen that the crimping (bending of the end portion 3 a) is configured so that pressure is applied substantially uniformly to the entire bottom surface A of the metal plate 101.

By constructing the pressure gauge 100 in this way, the pressure resistance strength of the shoulder portion 1c of the connector housing 1 that becomes the crimping joint is greatly improved, so that the resin of the connector housing 1 is deformed or damaged during manufacture. Disappears.
In addition, the improvement of the pressure strength makes it difficult for deformation and bending to occur, thereby realizing a pressure gauge that can be used even at high pressure.

  FIG. 4 is a cross-sectional view of a portion of the pressure gauge 200 of the second embodiment that is integrally formed with the connector housing 1 made of resin. The pressure gauge 200 has substantially the same structure as the pressure gauge 100 of the first embodiment, but has a great feature in the shape of the inner periphery (open hole) 201a of the substantially ring-shaped metal plate 201.

In FIG. 5, the front view (a) of this pressure gauge 200 and the front view (b) of the metal plate 201 which is the component are shown.
A groove 201b for alignment used at the time of manufacture is provided on the outer periphery of the metal plate 201, and the inner periphery (open hole) 201a of the metal plate 201 is formed from 12 sides including the sides a1, a2, and a3. It is configured. That is, the shape of the inner periphery (open hole) 201a is a shape closed to one ring having four convex portions or four concave portions.

  By constructing the pressure gauge 200 in this way, a large resin seating surface can be obtained, and the compressive stress on the resin can be reduced, so that a pressure gauge that can be used even at high pressure can be realized. Moreover, since the resin shear length can be increased by making the shape of the substantially ring-shaped inner periphery (excavation hole) 201a of the metal plate longer, the thickness of the resin under the metal plate can be reduced, and the pressure gauge can be made compact. Can be realized.

  FIG. 6 shows a modification of the metal plate 201 of the second embodiment. For example, as shown in (a) to (c), even if the shape of the inner periphery (open hole) 201a of the metal plate 201 is formed, the same operation and effect as in the second embodiment can be obtained. .

FIG. 7 is a cross-sectional view (a) of a portion integrally formed with the connector housing 1 formed of resin of the pressure gauge 300 of the third embodiment, and a partially enlarged view of a metal plate 301 that is a part thereof. It is sectional drawing (b).
This pressure gauge 300 has substantially the same structure as the pressure gauge 100 of the first embodiment, but has a great feature in the shape of the punched hole in the substantially ring-shaped metal plate 301 and the shape of the outer periphery of the ring.

That is, an uneven structure composed of a series of grooves 301d, peaks 301c, and the like that fit into a part of the connector housing 1 is formed over the inner circumference of the substantially annular shape of the metal plate 301 and the outer circumference of the circumference.
Since the amount of shrinkage per unit volume at the time of heat drop in the above-described integral molding of the connector housing 1 made of resin is larger than the amount of shrinkage per unit volume of the metal plate 301 due to the heat drop at this time, FIG. The crest 301c of b) is fastened by the connector housing 1 from both the upper and lower sides.

  Due to this action, there is no gap due to resin sink marks in the connector housing 1 near the bottom surface A of the metal plate 301. That is, the resin sink (gap between the metal plate generated by the shrinkage of the resin with a temperature drop) that can occur on the bottom surface of the metal plate when the resin is integrally formed is prevented.

  Thereby, even if the pressure gauge is mounted on a vehicle or the like, the metal fatigue of the bonding wire due to the vibration of the resin generated by this sink (gap) is eliminated, and the reliability and durability of the pressure gauge can be improved.

  FIG. 8 shows a modification of the metal plate 301 of the third embodiment. For example, the uneven structure such as (a) groove structure, (b) dovetail structure, or (c) taper groove structure is adopted as the structure (cross-sectional shape) of the outer peripheral surface or inner peripheral surface of the metal plate 301. Even in this case, it is possible to obtain the same operation and effect as the third embodiment.

(Other variations)
FIG. 9 is a cross-sectional view (a) to (i) showing another modification of the metal plate 101, 201, or 301 of each embodiment of the present invention.
For example, (c), (f), and (i) are respectively R-shaped, taper-shaped, and step-shaped by grinding or the like, and the corners of the shoulders of each metal plate are formed by these moldings. It has been dropped. As described above, since the metal plate that forms the shoulder portion of the connector housing 1 is dropped, the joint portion of the metal plate can be widened, so that pressure is applied evenly to the entire bottom surface A of the metal plate. As a result, the bonding strength and pressure resistance are improved.

  Moreover, you may drop the corner | angular part of the shoulder part of a metal plate by the bending process etc. of a metal plate so that it may illustrate to Fig.9 (a), (b). Even with such a configuration, since the joining portion in the caulking of the metal plate can be made wider, pressure is evenly applied to the entire bottom surface A of the metal plate, and the joining strength and pressure resistance are improved.

  Further, by forming the metal plate into a step shape as illustrated in (d), (e), (g), (h), etc. (that is, an uneven structure constituted by grooves, mountains, etc.), Bonding strength and pressure resistance can be improved without changing the resin mold.

  In the above-described embodiments or modifications thereof, the connector housing 1 and the sensor housing 3 are joined and fixed by caulking. However, the shoulder portion of the connector housing 1 serving as a joining portion has a substantially ring shape. When configured with a metal plate, the connector housing 1 and the sensor housing 3 can be joined and fixed by a joining method such as welding or fitting.

The side view of the pressure gauge 100 of 1st Example of this invention. Sectional drawing of the pressure gauge 100 of 1st Example of this invention. The front view of the pressure gauge 100 of 1st Example of this invention. Sectional drawing (part) of the pressure gauge 200 of 2nd Example of this invention. The front view (a) of the pressure gauge 200 of 2nd Example of this invention, and the front view (b) of the metal plate 201 which is the component. Front view (a)-(c) which shows the modification of the metal plate 201 of 2nd Example of this invention. Sectional drawing (a) of the pressure gauge 300 of 3rd Example of this invention, and the elements on larger scale (b) of the metal plate 301 which are the components. Sectional drawing (a)-(c) which shows the modification of the metal plate 301 of 3rd Example of this invention. Sectional drawing (a)-(i) which shows the other modification regarding the metal plate 101, 201, or 301 of each Example of this invention. Sectional drawing of the pressure gauge 900 by a prior art.

DESCRIPTION OF SYMBOLS 100, 200, 300 ... Pressure gauge 101, 201, 301 ... Metal plate 1 ... Connector housing 1a ... Neck part 1c ... Shoulder part 2a, 2b ... Terminal pin 3 ... Sensor housing 3a ... End part of sensor housing (caulking process part)
5 ... Pressure-sensitive element 7 ... Sealing diaphragm 8 ... O-ring 12 ... Bonding wire 13 ... Filling liquid (pressure transmission medium)
A ... Metal plate bottom H ... Punched hole

Claims (2)

A sensor housing made of metal and having a pressure introduction hole, and a connector housing made of resin and mounted with a pressure sensitive element to which a pressure to be measured introduced from the pressure introduction hole is applied, are projected on the sensor housing. a pressure gauge is assembled by caulking joining by bending the part or end, a shoulder portion of the connector housing as the joint portion of the caulking a metal plate-ring shape, wherein the metal plate is the connector In the pressure gauge integrally molded with the housing,
The metal plate has a ring-shaped first portion serving as a joint portion of the caulking and a diameter that is continuous with the first portion in the thickness direction of the metal plate and smaller than the diameter of the first portion. The ring-shaped second part,
In the second portion, the ring- shaped inner periphery or the outer periphery is formed integrally with the resin of the connector housing and fitted with the resin, and a gap due to resin shrinkage is formed between the bottom surface and the resin. A pressure gauge characterized by having a series of grooves, peaks, or concavo-convex structures that are prevented from being generated . A sensor housing made of metal and having a pressure introduction hole, and a connector housing made of resin and mounted with a pressure sensitive element to which a pressure to be measured introduced from the pressure introduction hole is applied, are projected on the sensor housing. A pressure gauge assembled by caulking that is joined by bending a part or an end thereof, wherein a shoulder portion of the connector housing, which becomes the caulking joint, is constituted by a substantially ring-shaped metal plate, and the metal plate is the connector In the pressure gauge integrally molded with the housing,
The metal plate has a ring-shaped first portion serving as a joint portion of the caulking and a diameter that is continuous with the first portion in the thickness direction of the metal plate and smaller than the diameter of the first portion. The ring-shaped second part,
In the second part, the ring- shaped inner periphery and the outer periphery are formed integrally with the resin of the connector housing and fitted with the resin, and a gap due to resin shrinkage is formed between the bottom surface and the resin. A pressure gauge characterized by having a series of grooves, peaks, or concavo-convex structures that are prevented from being generated .

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