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JPS5627620

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DESCRIPTION JPS5627620
Description 1 Title of Invention
セッサ
3. Detailed Description of the Invention The present invention relates to a sensor for converting
various physical quantities into electrical quantities, and more particularly to a sensor packaging
structure. Various types of sensors used for automatic control, measurement, etc. are
conventionally known, and their detection elements are generally housed in a casing made of
metal, synthetic resin or the like for protection. Relatively small sensors often have mounting
screws on the outer periphery of the casing, so that the screw part of the casing can be attached
to the test object by screwing it into the screw hole of the test object. It has become. Such a type
of sensor has the advantage of being able to be conveniently attached to the object to be
inspected without the use of other special fasteners, but by rotating the casing itself upon its
attachment Since the screw must be screwed into the screw hole, if the casing leads out, the lead
will be twisted during installation and lead to the detection element in the casing connected with
this lead A force acts from the line, and the detection characteristics of the detection element
may be deteriorated. It is an object of the present invention to provide an improved pancaging
sensor which overcomes the above-mentioned drawbacks of the conventional casing. According
to the present invention, according to the present invention, there is provided a cylindrical case
having an attachment portion to an object to be inspected at one end and the other end being
open, a detection element disposed in the cylindrical case, and the cylindrical case The front end
page is attached to the other end of the front end page: a sensor such as a sensor having a
connector and a housing that closes a hearing opening, and a connection terminal supported by
the connector housing and electrically connected to the detection element. According to the
present invention, since the connection terminal of the connector is connected to another electric
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device by the connection terminal of the connector and the lead wire is not drawn from the
casing, even if the casing is rotated during the attachment, the lead wire There is no kinking, and
no force acts on the detection element through the lead wire. The invention will now be
described in detail by way of example with reference to the accompanying drawings. In the
following embodiments, the sensor of the present invention will be described as a vibration
sensor for knock detection attached to an automobile engine, but the sensor according to the
present invention is limited to this vibration sensor. is not. FIG. 1 is a longitudinal sectional view
showing a first embodiment of a vibration sensor according to the present invention, and FIG. 2
is a sectional view thereof. In the figure, 1 shows a cylindrical casing made of metal.
The cylindrical casing 1 is constituted by (3) in a bottomed cylindrical body, has a screw portion
2 for attachment at one end on the bottom side, the other end is open, and the outer peripheral
portion is shown in FIG. It is hexagonal as shown in. A plate-shaped detection element 4 is
provided in the inner cylindrical portion 3 of the cylindrical casing 1. The detection element 4 is
made of a piezoelectric ceramic such as BaTiO 3, and has electrode plates 5.6 on both sides of
the negative side end thereof, and is mounted on the substrate 7 in a cantilever state. The
opening of the cylindrical casing 1 is closed by a connector housing 8 made of synthetic resin
which engages in the inner cylindrical portion 3. The connector housing 8 is fixed to the
cylindrical casing 1 by caulking the opening edge 9 of the cylindrical casing 1. The connector
housing 8 has an extended cylindrical portion 10, which surrounds the detection element 4 and
engages with the outer peripheral edge of the substrate 1 at the tip edge, Is fixed to the
cylindrical casing 1 by pressing it against the bottom of the inner cylindrical portion 3. The
connector housing 8 has two terminal holding holes 11.12, and male connection terminals 13.14
are attached to the terminal holding holes 11 and (4) 12, respectively. The connection terminals
13.14 are each connected at one end to the electrode plate 5 or 6 in a conductive relationship via
lead wires 15.16. Further, the other ends of the two connection terminals 13.14 are respectively
located in the connector holes 1B and 19 defined by the / el portion 11 of the connector housing
8, and with the connector housing 8 and An O-ring 20 is provided between the cylindrical casing
1 and the caulking portion is covered with a synthetic resin 21. Next, the procedure for
assembling the vibration sensor having the above-described structure will be described by way of
an example. The detection element 4 mounted on the substrate 7 together with the electrode
plate 5.6 is prepared in advance, and one end of each lead wire 15.16 is soldered to the electrode
plate 5.6. Then, one end of the connection terminal 13.14 is soldered to the other end of the lead
wire 15.16. The connection terminal 13.14 of the assembly of the detection element 4 and the
connection terminal 13.14 is inserted into the terminal holding hole lL12 (5) of the connector
housing 8 from the side of the extension cylindrical portion 10, respectively, and the connection
terminal 13 The respective claws 22. 23 of the fourteen are brought into non-return engagement
with the engaging portions 24. 25 formed on the connector housing 8. Thus, the connection
terminals 13.14 are fixed to the connector housing 8 in reverse.
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At this time, the substrate 1 and the extension tubular portion 10 may be joined by an adhesive.
Next, the side of the extended cylindrical portion 10 of the connector housing 8 is inserted into
the cylindrical casing 1, and then the opening edge 9 of the cylindrical casing 1 is crimped
inward, and the shoulder 26 of the connector housing 8 is crimped. The connector · · · housing 8
is fixed to the cylindrical casing 1 by engaging it. At the same time, the substrate 7 is pressed
against and fixed to the bottom of the cylindrical casing 1. Before inserting the connector /
widget 8 into the cylindrical casing 1, the 0 ring 20 is placed in advance on the stepped portion
in the cylindrical casing 1. After completion of the caulking as described above, the synthetic
resin 21 is molded on the caulking portion and the sole thereof is performed. (6) EndPage: 2 If
the mating connector housing is engaged with the shell portion 17 of the connector · · · · · · · · · · · ·
· · · · by sealing the connector hole 18. It is visited during the passage of water, gas, etc. into the
room in which the detection element 4 is stored. FIG. 3 is a longitudinal sectional view showing a
second embodiment of the vibration sensor according to the present invention. In FIG. 3, parts
corresponding to FIG. 1 are indicated by the same reference numerals as those in FIG. The
detection element 4 disposed in the inner cylindrical portion 3 in the cylindrical casing 1 is
surrounded by a cylindrical inner side case 30 whose both ends are open. The inner side case 30
has one end engaged with the outer peripheral edge of the substrate 7 and is thereby closed at
one end, and the other end is attached with the inner upper plate 31 attached at the other end
ing. The substrate γ, the inner side case 30 and the inner upper plate 31 may be connected to
each other by an adhesive or the like, and a closed chamber 32 housing the detection element 4
is defined therein. By fixing the connector housing 8 to the cylindrical casing 1 by caulking the
substrate γ, the inner side case 30 and the inner apply material 31, the space between the
connector housing 8 and the bottom of the inner case 30 is fixed. Haunted and fixed. The
connection terminals 13.14 are each fixed at one end thereof to the adhesive or a screw or the
like on the inner apply 31. According to the vibration cell having the above-mentioned structure,
the inner upper plate 31 receives the force acting on the connection terminal 13.14 when the
connector is connected, and the force is transmitted through the lead wire 15.16 and the
detection element 4 Transmission is prevented.
In the case of the illustrated embodiment, the lead wires 15.16 are each bent in a U-shape in the
middle to prevent application of force to the detection element 4 through the lead wires 15.16.
Shock absorbers 15 'and 16'. In the above-described vibration sensor, the outer case is composed
of the cylindrical casing 1 and the connector housing 8, and the inner case is composed of the
substrate 7, the inner side case 30, and the inner upper plate 31. The vibration sensor shown in
FIG. 3 can be more reliably prevented from invading water, gas, etc. into the portion of the
detection element 4 because it is double-packaged and stored in the closed chamber 32. The
procedure for assembling will be described by taking an example. First, the detection element 4
attached together with the electrode plate 5.6 on the substrate γ is prepared in advance, and
one end of the lead wire 15.16 is soldered to each of the electrode plates 5.6. The inner side case
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30 is placed on the inner side case so as to surround the detection element 4, and the case 30
and the substrate γ are adhered. Next, the inner upper frame 31) is mounted on all the inner
side cases 30 to which the connection terminals 13. 14 have been attached in advance, and the
inner side case 30 is adhered. At this time, the other end of each of the lead wires 15.16 is pulled
out to the outside of the inner upper plate 31 through the lead wire through holes 33.34
provided in the in-line-deletion naasopa plate 31 in advance. The other end of each is soldered to
the (9) connection terminal 13.14. Next, the above-described assembly is inserted into the inner
cylindrical portion 3 of the cylindrical casing 1 and placed on the bottom of the inner cylindrical
portion 3. Thereafter, the connector housing 8 is fitted into the inner cylindrical portion 3 of the
cylindrical casing 1 and the opening edge 9 is crimped inward to fix the connector housing 8 to
the cylindrical casing 1. When the connector housing 8 is attached to the cylindrical casing 1, the
terminal holding hole 11.12 thereof and the connection terminal 13.14 are engaged, and the
carp lid housing 8 is inserted into the cylindrical casing 1. The connection terminal 13.14 is
projected into the connector hole 18.19. FIG. 4 is a longitudinal sectional view showing a third
embodiment of the vibration sensor according to the present invention. A metal substrate 35 is
mounted on the bottom of the inner cylindrical portion 3 of the cylindrical casing 1, and the
metal substrate 35 defines the extended cylindrical portion 10 of the connector housing 8 and
the male sealing chamber 36. Further, a cap-like inch cover 31 is adhered on the metal substrate
35, and the inner cover 37 cooperates with the metal substrate 35 to define a sealed (10)
EndPage: three chamber 38 inside thereof. The detection element 4 is accommodated in the
closed chamber 38.
Even in the vibration sensor having the above-described structure, since the detection element 4
is double-wrapped, it is surely prevented that water, gas or the like intrudes into the portion of
the detection element 4, and the connection terminals 13.14 each have an inch. Because it is
fixed to the cover 31, the force is prevented from being transmitted to the detection element 4
from the connection terminal 13.14 through the lead wire 15.16-When the vibration sensor 4
shown in FIG. 4 is assembled The detection element 4 mounted on the substrate γ together with
the electrode plate 5.6 is fixed to the central portion of the metal substrate 35 by an adhesive or
the like, and then the inner cover 37 is covered on the metal substrate 35 to form the detection
element 4. At this time, one end of each lead 15.16 is covered with the inner cover. The lead
wires are drawn to the outside through the lead wire through holes 39.40 provided on the
surface 31, and are respectively connected to the connection terminals 13.14 by soldering or the
like. Next, the assembly as described above is placed on the bottom of the inner cylindrical
portion 3 of the cylindrical casing 1, and then (11) the connector housing 8 is inserted into the
inner cylindrical portion 3, and the connector housing 8 is crimped. Fix it to the cylindrical
casing 1. FIG. 5 shows a fourth embodiment of a vibration sensor according to the present
invention. This embodiment id is a modification of the embodiment shown in FIG. 4. The inch
cover 31 is fixed at its top with a terminal 43.44 having a clasp portion 4L42 engaged with one
end of the connection terminal 13.14. There is. In this case, the lead wires 15.16 are respectively
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connected to the terminals 43.44. The connection terminals 13-114 are inserted from the side of
the connector hole 18.19 of the connector housing 8 into the i-port holding hole 11.12 after
completing the attachment of the inner cover 31 and the connector housing 8, thereby one end
of the connector The clamp portions 41. 42 of the terminals 43 and 44 can be engaged to
connect them. Further, in the case of this embodiment, the extension cylindrical portion 10 is
separate from the connector housing 8. FIG. 6 is a longitudinal sectional view showing a fifth
embodiment of the vibration sensor according to the present invention. The embodiment (12)
shown in FIG. 6 is a modification of the embodiment shown in FIG. In the case of this
embodiment, the synthetic resin 45 is filled in the closed chamber 36. Further, the connector
housing 8 is provided with filling holes 46 for filling the inside of the sealed chamber 36 with
synthetic resin. In the case of this embodiment, the sealing performance in the sealed chamber
38 is further improved. FIG. 7 is a longitudinal sectional view showing a sixth embodiment of the
vibration sensor according to the present invention. A metal substrate 35 is attached to an
intermediate portion of the inner cylindrical portion 3 of the cylindrical casing 1 so as to cross
the axis thereof.
The detection element 4 is attached to the lower bottom of the metal substrate 35, that is, the
bottom of the inner cylindrical portion 3 together with the substrate γ. The detection element 4
is covered with an inner cover 37 adhered to the lower bottom surface of the metal substrate 35,
and is housed in a closed chamber 38 in which the inner cover 31 and the metal substrate 35 are
defined. In this case, the lead wire 15.16 extends upward in the figure of the metal substrate 350
through the lead wire through holes 4γ and 48 provided in the substrate γ and the metal
substrate 35, respectively, and the connection terminal 13, (13 ) 14 are connected respectively.
The connection terminals 13.14 are carried by the connector housing 8 by insert molding. An
intermediate sleeve member 49 is disposed between the connector housing 8 and the metal
substrate 35. As shown in FIG. 8, the intermediate sleeve member 49 is partially cut away so that
it can be disposed between the connector arm 8 and the metal substrate 35 after connecting the
lead wire 15.16 to the connection terminal 13.14. It has a section 50. In the vibration sensor
having the structure as described above, since the lead wire 15.16 is taken out from the side of
the substrate T, it does not cross the inside of the sealed chamber 38. There is no risk of touching
the first letter in four and a more reliable sensor is obtained. Next, the procedure of the assembly
of the vibration sensor shown in FIG. 7 will be described by way of an example. First, the
substrate 1 carrying the detection element 4 is bonded to one surface of the metal substrate 35,
and one end of each of the lead wires 15.16 is soldered to the electrode plate 5.6, and each of
them is pierced (14) EndPage: The other side of the metal substrate 35 is drawn through the 4
through holes 47 and 48. In the illustrated embodiment, the lead wires 16 are soldered to the
connection piece 51 substantially integral with the electrode plate 6. Next, the inner cover 31 is
adhered to the one surface of the metal substrate 35, and the detection element 4 is covered.
Further, the connection terminals 13.14 supported by insert molding in the carp / kuta housing
8 are connected with the lead wires 15.16 by soldering or the like, and then the metal substrate
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35 and the connector housing 8 are connected. The intermediate sleeve member 49 is attached
therebetween. This attachment is done by putting the lead wire 15.16 inside through the notch
50. Next, the three assemblies as described above are inserted into the cylindrical casing 1, and
the metal substrate 35 is engaged with the step 52 of the inner cylindrical portion 3. After this,
the opening edge 9 of the cylindrical casing 1 is crimped inward and this is engaged with the
shoulder 26 of the connector housing 8, the caulking opening edge 9 of the assembly and the
said It is fixed in such a way as to be drawn in between the step 52.
(15) FIG. 9 is a longitudinal sectional view showing a seventh embodiment of the vibration sensor
according to the present invention. This embodiment is a modification of the embodiment shown
in FIG. In the case of the above embodiment, one of the electrode plates 5 of the detection
element 4 is directly connected to the metal substrate 35 in a conductive relationship, and is
grounded via the cylindrical casing 1 so that the detection is performed. One lead 16 is extended
from the element 4, and the lead 16 is connected to the connection terminal 14. Although the
invention has been described in detail with respect to specific embodiments, it is to be
understood by those skilled in the art that the invention is not limited to these but various
embodiments are possible within the scope of the invention. It will be clear.
4. Brief description of the drawings FIG. 1 is a longitudinal sectional view showing a first
embodiment according to the present invention, FIG. 2 is a sectional view thereof, and FIGS. 3 to
7 are second parts of a vibration sensor according to the present invention FIG. 8 is a perspective
view showing an intermediate sleeve member used for the vibration sensor shown in FIG. 7. FIG.
9 is a seventh embodiment of the vibration sensor according to the present invention. It is a
longitudinal cross-sectional view which shows (16). DESCRIPTION OF SYMBOLS 1-Cylindrical
canning, 2-screw part, 3-inner cylinder separation 4-detection element, 5.6-electrode plate, 7insulating substrate, 8-connector · · · · · · · 9-opening edge, 10-extended cylinder -Shaped portion,
11.12-terminal holding hole, 13.14-connection terminal, 15.16-lead wire, 17-connector / el,
18.19-connector hole, 20-O ring, 21-resin, 22.23 ~ Nail, 24.25 holding part, 26 ~ shoulder part,
30 ~ inner side case, 31 ~ inner heat plate, 32 ~ sealed chamber, 33. 34 ~ through hole, 35 ~ metal
substrate, 36 ~ sealed chamber , 3γ-inner cover, 38-sealed chamber, 39.40-through hole, 41.42clamp part, 43.44-terminal, 45-resin, 46-resin injection hole, 41.48-through hole, 49Intermediate sleeve member, 50-notch, 51-connection piece, 52-step Applicant Toyota Motor
Industry Co., Ltd. representative Attorney Akashi AkiraAtsushi (17) Figure 1 Figure 2 EndPage: 5
Figure 3 Figure 5 Figure 4 Figure 6 EndPage: 6
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