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JPH11341588

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH11341588
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a flextensional type underwater transducer.
[0002]
2. Description of the Related Art FIG. 4 is a structural view showing a conventional underwater
transducer, FIG. 4 (a) is a plan sectional view of the whole, and FIG. 4 (b) is a plan sectional view
of an essential part. In the figure, 1 is an aluminum alloy elliptical shell, and 2 is a drive part if it
consists of a coil and a drive material.
[0003]
Reference numeral 3 denotes a stainless steel transmission rod having a circular cross-sectional
shape attached to both ends of the drive unit 2; 4 a piston having a circular cross-sectional shape
provided on the transmission rod 3; The through hole 6 is an O-ring fitted to the transmission
rod 3 with the piston 4 interposed therebetween. An oil space 7 for moving the piston 4 is
formed by providing a stainless steel or aluminum alloy lid 8 in a hole made in the elliptical shell
1.
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[0004]
The oil space 7 is filled with the sufficiently defoamed oil 9 and sealed with the O-ring 6. The oil
9 flows between the left and right oil spaces 7 separated by the piston 4 by the through hole 5 of
the piston 4 of the transmission rod 3. The volume change rates of the left and right oil spaces 7
divided by the piston 4 are made equal so that no stress is generated in the piston 4 when the
piston 4 moves to the left and right in the oil space 7 . That is, the left and right volume change
amounts (one increases and the other decreases) generated when the piston 4 moves to the left
and right are made to be the same.
[0005]
Here, the drive unit 2 is given a desired prestress, and although not shown here, the opening of
the elliptical shell 1 is closed with a lid, and the inside of the elliptical shell 1 is sealed. The
operation of the above-mentioned conventional underwater transducer will be described. When
the drive unit 2 is driven by the electrical signal, a force is transmitted to the oil 9 through the
transmission rod 3 and the piston 4. At this time, it can be regarded as a Helmholtz resonance
system in which the oil space 7 is a cavity and the oil 9 in the through hole 5 is a mass. Here, the
Helmholtz resonance system can be regarded as the same as a mass-spring one-degree-offreedom resonance system.
[0006]
As a feature of the Hertzholm resonance system, the mass in the through hole 5, in this case the
oil 9, can freely vibrate at a frequency before the resonance frequency, but the vibration of the
mass gradually becomes smaller when the resonance frequency is exceeded. The mass hardly
vibrates at a frequency sufficiently higher than the resonance frequency. If this effect is used, in
the underwater transducer according to the present embodiment, at low frequencies outside the
use band, the oil 9 moves left and right through the through hole 5, and the transmission rod 3
and the piston 4 move left and right. The force generated by the drive unit 2 is not transmitted to
the elliptical shell 1. The oil 9 in the through hole 5 does not move to the left and right when the
high frequency which is the use band in the underwater transducer according to the present
embodiment is used, and the oil 9 apparently appears as a completely rigid body. The force can
be efficiently transmitted to the elliptical shell 1 via the transmission rod 3.
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[0007]
Here, when the underwater transducer is sunk, the elliptical shell 1 is extended in the major axis
direction by water pressure, which is the same as the operation at low frequency, and the oil 9 in
the oil space 7 is a through hole Since it is possible to move through 5 and thereby no force is
applied to the transmission rod 3, no force is applied to the drive unit 2 and the prestress is not
changed.
[0008]
In the conventional underwater transducer described above, the sliding portion 13 of the
elliptical shell 1, the transmission rod 3 and the lid 8 and the transmission rod 3 forms the oil 9
in the O-ring 6. And very tight fit tolerances.
Further, when the lid 8 is made of aluminum alloy, the friction coefficient of the transmission rod
3 during sliding movement is very large because the friction coefficient between the aluminum
alloy of the elliptical shell 1 and lid 8 and the stainless steel of the transmission rod 3 is large.
turn into. For this reason, the stress generated in the elliptical shell 1 is transmitted to the drive
unit 2 through the transmission rod 3, and there is a problem that a change in acoustic
performance or breakage of the drive unit 2 occurs due to the magnitude of deformation of the
elliptic shell 1 there were.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention relates to an underwater transmitter-receiver in which both ends of a drive unit are
connected to the inner peripheral surface in the major axis direction of an elliptical shell. The
transmission rod and the elliptical shell are switched between the sliding state and the direct
connection state according to the frequency, while providing the transmission rod driven so as to
move along the long axis direction of the elliptical shell by the drive unit at both ends of Means is
provided, and the sliding portion between the elliptical shell and the transmission rod is
anodized, or at least one of the sliding portion between the elliptical shell and the transmission
rod is coated with a resin, or the elliptical shell is A sliding bearing is provided on the sliding part
with the transmission rod.
[0010]
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FIG. 1 is a structural view showing a first embodiment of the underwater transducer according to
the present invention, FIG. 1 (a) is a plan sectional view of the whole, and FIG. 1 (b) is an essential
part It is a plane sectional view.
In the figure, 1 is an aluminum alloy elliptical shell, and 2 is a drive part if it consists of a coil and
a drive material.
[0011]
Reference numeral 3 denotes a stainless steel transmission rod having a circular cross-sectional
shape attached to both ends of the drive unit 2; 4 a piston having a circular cross-sectional shape
provided on the transmission rod 3; The through hole 6 is an O-ring fitted to the transmission
rod 3 with the piston 4 interposed therebetween. An oil space 7 for moving the piston 4 is
formed by providing a stainless steel or aluminum alloy lid 8 in a hole made in the elliptical shell
1.
[0012]
The oil space 7 is filled with the sufficiently defoamed oil 9 and sealed with the O-ring 6. The oil
9 flows between the left and right oil spaces 7 separated by the piston 4 by the through hole 5 of
the piston 4 of the transmission rod 3. The volume change rates of the left and right oil spaces 7
divided by the piston 4 are made equal so that no stress is generated in the piston 4 when the
piston 4 moves to the left and right in the oil space 7 . That is, the left and right volume change
amounts (one increases and the other decreases) generated when the piston 4 moves to the left
and right are made to be the same.
[0013]
Here, the drive unit 2 is given a desired prestress, and although not shown here, the opening of
the elliptical shell 1 is closed with a lid, and the inside of the elliptical shell 1 is sealed. A
circumferential sliding portion 10 is formed between the transmission rod 3 and the O-ring 6 and
the elliptical shell 1, between the piston 4 and the elliptical shell 1, and between the transmission
rod 3 and the O-ring 6 and the lid 8, The sliding portion 10 is anodized and then sealed with a
fluorocarbon resin. This surface treatment includes not only the sliding portion 10 but also the
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entire elliptical shell 1 and the entire elliptical shell 1 including the lid 8 when the lid 8 is made
of aluminum alloy, or a partial including the sliding portion 10 It may be applied to any part.
Further, the sealing treatment is not necessarily required, and only the anodizing treatment may
be performed as long as a desired coefficient of friction is obtained. Furthermore, when sealing
treatment is performed, the material used for the sealing treatment is not limited to the fluorine
resin, as long as the coefficient of friction is small.
[0014]
The operation of the underwater transducer according to the first embodiment described above
will be described. When the drive unit 2 is driven by the electrical signal, a force is transmitted to
the oil 9 through the transmission rod 3 and the piston 4. At this time, it can be regarded as a
Helmholtz resonance system in which the oil space 7 is a cavity and the oil 9 in the through hole
5 is a mass. Here, the Helmholtz resonance system can be regarded as the same as a mass-spring
one-degree-of-freedom resonance system.
[0015]
As a feature of the Hertzholm resonance system, the mass in the through hole 5, in this case the
oil 9, can freely vibrate at a frequency before the resonance frequency, but the vibration of the
mass gradually becomes smaller when the resonance frequency is exceeded. The mass hardly
vibrates at a frequency sufficiently higher than the resonance frequency. If this effect is used, in
the underwater transducer according to the present embodiment, at low frequencies outside the
use band, the oil 9 moves left and right through the through hole 5, and the transmission rod 3
and the piston 4 move left and right. The force generated by the drive unit 2 is not transmitted to
the elliptical shell 1. The oil 9 in the through hole 5 does not move to the left and right when the
high frequency which is the use band in the underwater transducer according to the present
embodiment is used, and the oil 9 apparently appears as a completely rigid body. The force can
be efficiently transmitted to the elliptical shell 1 via the transmission rod 3.
[0016]
Here, when the underwater transducer is sunk, the elliptical shell 1 is extended in the major axis
direction by water pressure, which is the same as the operation at low frequency, and the oil 9 in
the oil space 7 is a through hole Since it is possible to move through 5 and thereby no force is
applied to the transmission rod 3, no force is applied to the drive unit 2 and the prestress is not
changed.
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[0017]
As described above, the elliptical shell 1 and the lid 8 are in contact with the transmission rod 3,
the piston 4 and the O-ring 6 at the sliding portion 10, and in the low frequency range, the
relative movement in the axial direction of the transmission rod 3 Do.
At this time, the coefficient of friction at the time of sliding movement between the elliptical shell
1 and the lid 8 and the transmission rod 3, the piston 4 and the O-ring 6 is about 0.04, which is
approximately the same as the coefficient of friction at the time of contact The coefficient of
friction is approximately 1/25, as compared to approximately 1.05, which is the coefficient of
friction at the time of contact between the conventional aluminum alloy and stainless steel. As a
result, the force (frictional force) by which the stress generated in the elliptical shell 1 is
transmitted to the drive unit 2 through the transmission rod 3 is reduced to about 1/25, so that
the change in acoustic performance is small and The effect of increasing the safety factor is
obtained. In addition, when the whole of the elliptical shell 1 and the lid 8 is subjected to
anodizing treatment and sealing treatment, a very high anticorrosion effect on seawater can be
obtained.
[0018]
FIG. 2 is a structural view showing a second embodiment of the underwater transducer according
to the present invention, FIG. 2 (a) is a plan sectional view of the whole, and FIG. 2 (b) is a plan
sectional view of essential parts. In the figure, 1 is an aluminum alloy elliptical shell, and 2 is a
drive part if it consists of a coil and a drive material. Reference numeral 3 denotes a stainless
steel transmission rod having a circular cross-sectional shape attached to both ends of the drive
unit 2; 4 a piston having a circular cross-sectional shape provided on the transmission rod 3; The
through hole 6 is an O-ring fitted to the transmission rod 3 with the piston 4 interposed
therebetween.
[0019]
An oil space 7 for moving the piston 4 is formed by providing a stainless steel or aluminum alloy
lid 8 in a hole made in the elliptical shell 1. The oil space 7 is filled with the sufficiently defoamed
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oil 9 and sealed with the O-ring 6. The oil 9 flows between the left and right oil spaces 7
separated by the piston 4 by the through hole 5 of the piston 4 of the transmission rod 3.
[0020]
The volume change rates of the left and right oil spaces 7 divided by the piston 4 are made equal
so that no stress is generated in the piston 4 when the piston 4 moves to the left and right in the
oil space 7 . That is, the left and right volume change amounts (one increases and the other
decreases) generated when the piston 4 moves to the left and right are made to be the same.
[0021]
Here, the drive unit 2 is given a desired prestress, and although not shown here, the opening of
the elliptical shell 1 is closed with a lid, and the inside of the elliptical shell 1 is sealed. A
circumferential sliding portion 10 is formed between the transmission rod 3 and the O-ring 6 and
the elliptical shell 1, between the piston 4 and the elliptical shell 1, and between the transmission
rod 3 and the O-ring 6 and the lid 8, The sliding portion 10 is coated with a fluorine resin. The
coating may be applied to only one or both of the elliptical shell 1 and the lid 8 constituting the
sliding portion 10 and the transmission rod 3 and the piston 4. In addition to the sliding portion
10, it may be applied to the whole of the elliptical shell 1, the lid 8 and the transmission rod 3, or
a partial portion including the sliding portion 10. Furthermore, the material used for the coating
is not limited to the fluorine resin as long as it has a small coefficient of friction.
[0022]
The operation of the underwater transducer according to the second embodiment described
above is the same as that described in the first embodiment. Thereby, the elliptical shell 1 and
the lid 8 are in contact with the transmission rod 3, the piston 4 and the O-ring 6 at the sliding
portion 10, and relatively slide in the axial direction of the transmission rod 3 in the low
frequency range.
[0023]
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At this time, the friction coefficient at the time of sliding movement between the elliptical shell 1
and the lid 8 and the transmission rod 3, the piston 4 and the O-ring 6 is substantially the same
as the friction coefficient at the time of contact between the fluorine resin and the fluorine resin
The same about 0.03 to about 0.04 is obtained, and the coefficient of friction is about 1/35 to
about 1/25, as compared with about 1.05 which is the coefficient of friction at the time of
contact between the conventional aluminum alloy and stainless steel. . As a result, the force
(frictional force) by which the stress generated in the elliptical shell 1 is transmitted to the drive
unit 2 through the transmission rod 3 is reduced to about 1/35 to about 1/25, so that the
change in acoustic performance is small. Also, the effect of increasing the safety factor against
destruction is obtained. In addition, when a coating process is given to the whole of the elliptical
shell 1 and the lid ¦ cover 8, the very high anti-corrosion effect with respect to seawater is
acquired.
[0024]
FIG. 3 is a structural view showing a third embodiment of the underwater transducer according
to the present invention, FIG. 3 (a) is a plan sectional view of the whole, and FIG. 3 (b) is a plan
sectional view of the main part. In the figure, 1 is an aluminum alloy elliptical shell, and 2 is a
drive part if it consists of a coil and a drive material. Reference numeral 3 denotes a stainless
steel transmission rod having a circular cross-sectional shape attached to both ends of the drive
unit 2; 4 a piston having a circular cross-sectional shape provided on the transmission rod 3; The
through hole 6 is an O-ring fitted to the transmission rod 3 with the piston 4 interposed
therebetween.
[0025]
An oil space 7 for moving the piston 4 is formed by providing a stainless steel or aluminum alloy
lid 8 in a hole made in the elliptical shell 1. The oil space 7 is filled with the sufficiently defoamed
oil 9 and sealed with the O-ring 6. The oil 9 flows between the left and right oil spaces 7
separated by the piston 4 by the through hole 5 of the piston 4 of the transmission rod 3.
[0026]
The volume change rates of the left and right oil spaces 7 divided by the piston 4 are made equal
so that no stress is generated in the piston 4 when the piston 4 moves to the left and right in the
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oil space 7 . That is, the left and right volume change amounts (one increases and the other
decreases) generated when the piston 4 moves to the left and right are made to be the same.
[0027]
Here, the drive unit 2 is given a desired prestress, and although not shown here, the opening of
the elliptical shell 1 is closed with a lid, and the inside of the elliptical shell 1 is sealed. Reference
numeral 11 denotes a circumferential sliding portion which occurs between the transmission rod
3 and the O-ring 6 and the elliptical shell 1, between the piston 4 and the elliptical shell 1, and
between the transmission rod 3 and O-ring 6 and the lid 8. The sliding portion 11 is formed by
press-fitting a slide bearing 12 into the elliptical shell 1 and the lid 8. The slide bearing 12 may
be fixed not only by press-fitting, but also by screwing, bonding, other fixing methods, or a
combination thereof, as long as the elliptical shell 1 and the lid 8 and the slide bearing do not
move relative to each other. good. Moreover, as the slide bearing 12, an oil-impregnated bearing
with a low friction coefficient is desirable.
[0028]
The operation of the underwater transducer according to the third embodiment described above
is the same as that described in the first embodiment. Thereby, in the sliding portion 10, the
elliptical rod 1 and the lid 8 and the transmission rod 3, the piston 4 and the O-ring 6 make
contact with the slide bearing 12 at the sliding portion 10, and in the low frequency range , Slide
relative to the axial direction of the transmission rod 3.
[0029]
At this time, the friction coefficient at the time of sliding movement between the elliptical shell 1
and the lid 8 and the transmission rod 3, the piston 4 and the O-ring 6 is substantially
determined by the friction coefficient of the slide bearing 12. Here, when an oil-impregnated
bearing is used for the slide bearing 12, the friction coefficient at the time of sliding movement is
about 0.03, compared with about 1.05 which is the friction coefficient at the time of contact
between the conventional aluminum alloy and stainless steel. The coefficient of friction is about
1/35. As a result, the force (frictional force) by which the stress generated in the elliptical shell 1
is transmitted to the drive unit 2 via the transmission rod 3 is reduced to about 1/35, so that the
change in acoustic performance is small and The effect of increasing the safety factor is obtained.
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In addition, when a coating process is given to the whole of the elliptical shell 1 and the lid ¦
cover 8, the very high anti-corrosion effect with respect to seawater is acquired.
[0030]
As described above, according to the present invention, the sliding portion between the
transmission rod for transmitting the driving force of the drive portion to the elliptical shell and
the transmission of the vibration of the elliptical shell to the drive portion, and the sliding portion
between the elliptical shell Anodizing treatment, fluorocarbon resin coating, or a slide bearing
provided, so that the friction coefficient in the sliding part is kept low, and the stress generated in
the elliptical shell is transmitted to the drive part 2 through the transmission rod The power can
be reduced to provide an underwater transducer with less change in acoustic performance and a
high safety factor against breakage.
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