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Publication
_________________________________________________________________
Number GB401587A
i»?
Title
_________________________________________________________________
EN Title
device
A
spark
plug
with
a piezo-electrical pressure-measuring
Abstract
_________________________________________________________________
[Class 106 (ii).] A sparking-plug encloses the crystals 9, 10 of a
piezo-electric device for measuring the pressure in the cylinder of an
internal combustion engine.
The pressure is transmitted by a diaphragm 6 and metal sleeve 5 to a
disc 8 supporting the crystals, the upper part of the sleeve serving
to screen the crystals from the ignition current.
The crystals may
discs, rods and c.
be
annular,
or
in the form of pairs of complete
Slightly conical insulation 3 may be employed.
Description
_________________________________________________________________
K U
-2
PATENT SPECIFICATION
Convention Date (Germany): April 15, 1932.
Application Date (in United Kingdom): April 12, 1933.
Complete Accepted, Nov 16, 1933.
COMPLETE SPECIFICATION.
A Spark Plug with a Piezo-electrical Pressure-measuring Device.
We, RADIOAKTIBNGESB Is L Sc H Ar T ID S.
LOEWE, of 10, Wiesenweg, BerlinSteglitz, Germany, a Company organized
under the Laws of Germany, and WALTHFR GUTZK Bs, of 34, Halskestrasse,
Berlin-Sitdende, Germany, a Citizen of the German Republic, do hereby
declare the nature of this invention and in what manner the same is to
be performed, to be particularly described, and ascertained in and by
the following statement:The
subject
matter
of
the
invention is a piezo-electrical
pressure-measuring device, which enables the variations ini 5 pressure
that takes place in the working cylinders of a prime mover to be
followed in accurate manner.
The idea of employing piezo-electric crystals, for instance " quartz "
for measuring the pressure of explosions is known per se The use of
these measuring crystals, however, calls for a particular embodiment
of the combustion chamber.
The subject matter of the invention is a pressure-measuring device,
which -may be fitted without difficulty to any cylinder of an internal
combustion engine, which does not affect in any way the capacity of
the cylinder, and in which the crystal is completely screened off
against the combustion gases.
According to the invention, the piezoelectric crystals are arranged
within the spark plugs themselves The crystals in accordance with the
invention, are mounted in such fashion that the combustion gases have
no access to the sameand that they are screened off electrically
against the ignition current of the spark plug.
According to the invention, the crystals may be constructed in annular
form, and disposed coaxially to the ignition pin.
4 Naturally, however, it is also possible to employ crystal discs,
rods or the like, and to arrange the same eccentrically in relation to
the ignition pin Further it is also possible, to employ a plurality of
O pairs of crystals, which are independent of each other and which are
connected with independent amplifiers and recording devices, so that
each measuring is lPrice 11-1 performed on a double or multiple scale.
By a suitable connection system known 55 per se it is then possible to
obtain a by no means inconsiderable increase in the charge of the
piezo-crystal.
Certain forms of embodiment of the invention are illustrated by way of
60 example in the drawings.
Fig 1 _ shows a section through a spark plug, in which the crystals
are constructed in the form of rings.
Fig 2 shows a form of embodiment, in 65which the pressure-measuring
element consists of a pair of crystal discs.
Figs 3 and 4 show sections taken through Figs 1 and 2 in the plane of'
the crystals 70 Fig 5 is a corresponding section through a spark plug
having two pairs of crystals.
In the drawings 1 is the metallic, body of the spark
insulated 75 ignition pin 4 and the ignition pin insu
into this fundamental part is the diaphragm 6, which
for example, of steel, and hermetically seals off
chamber of 80 the cylinder against the crystal space.
plug having the
lation 3 Fitted
nrvay -consist,
-the combustion
The metallic diaphragm 6 is firmly conaected with the tubular member
5, which possesses a bearing surface 7 for the pressure ring 8, and at
the same time elec 85 trically screens off the piezo-electric crystals
9, 10 against the ignition pin 4 by means of -the upper part 14 of the
member 5 The: diaphragm 6 is fitted in the body 1 and secured by means
of the 90 threaded hollow member 2, if necessarywith the interposition
of a washer The insulation member 3 with the ignition pin 4 is fitted
in the metallic sleeve 5 and connected with the same in gastight 95
fashion for example by means of cement or the like The insulation
member 3 may conveniently be constructed in slightly conical form,
whereby sealing is facilitated to a by no means inconsider 100 able
degree.
After the diaphragm has been introduced together with the metallic
member 5 the pressure ring 8 is placed overthe bearing surface 7 (On
the pressure 105 ring 8 there are arranged the piezo-elec401,587 No
10,905/33. trio crystals 9 and 10 with the intermediately disposed
electrode 11, and these are pressed firmly against the base by the
threaded cover 13 By suitably tightening the screw connections it is
possible
to
produce in reliable fashion an absolutely secure
connection of all parts and an absolutely gas-tight closure In Figs 1
and 3 the crystals 9 and 10 are constructed in the form of rings,
which concentrically surround the ignition pin 4 In the arrangements
according to Figs 2, 4 and the crystal rings are replaced by crystal
discs 15 and 16 In all other respects these arrangements may be
embodied to correspond with the arrangement as described in detail
according to Fig 1.
Naturally other forms of embodiment of the arrangement according to
the invention are quite conceivable It is essential as regards the
invention that the crystals are arranged within the spark plugs
themselves in a space which is sealed ofi in gas-tight fashion against
the combustion gases, that the same are properly screened oft
electrically against the ignition current, and that the pressure is
transmitted to the crystals with the assistance of a diaphragm and
with the interposition of a pressure member, which at the same time
may act as screening means and carry the insulated ignition pin.
It is furthermore essential that the bearing surface and the cover
surface. which hold the crystals together with a certain pressure, are
simultaneously constructed as metallic conductance for the crystals
electrically connected with the metallic mass of the plug.
Having now particularly described and ascertained the nature of our
said invention and in what manner the same is to be performed, we
declare that what we
Claims
_________________________________________________________________
claim is:-
1) A piezo-electrical pressure-measuring device, more particularly for
measuring the working pressure in the cylinders of prime movers,
characterized in that the piezo-electric crystals are arranged in a
spark plug.
2) A device according to Claim 1, characterized in that the crystals
are arranged in a chamber of the spark plug, which is sealed off
against the combustion chamber in gas-tight fashion.
3) A device according to Claims 1 and 2, characterized in that the
crystals are screened off electrically against the ignition current.
4) A device according to one or more of the preceding claims,
characterized in that the crystals are mounted to be immovable within
the spark plug.
5) A device according to one or more of the preceding claims,
characterized in that the measuring pressure is transmitted to the
crystals by means of a diaphragm and a pressure-transmitting means
which is interposed between the '70 diaphragm and the crystals.
6) A device according to one or more of the preceding claims,
characterized in that the pressure-transmitting means possesses an
extension, and the crystals 75 are screened off electrically against
the ignition pin.
7) A device according to one or more of the preceding claims,
characterized in that the ignition pin is arranged in an 85 insulating
tube,
and
the
insulating
tube
is
connected
with
the
pressure-transmitting means in gas-tight fashion for example by
cementing.
8) A device according to
characterised in that the
constructed to be conical.
one or more 8; of the preceding claims,
insulating tube of the ignition pin is
9) A device according to one or more of the preceding claims,
characterised in 9 O; that the diaphragm is secured in the metallic
body of the plug by means of a threaded portion, possibly with the
interposition of a washer, and that this threaded portion is either
constructed it 5 self to constitute a casing for the piezoelectric
crystals, or carries this casing.
10) A device according to one or more of the preceding claims,
characterised in that the crystal bearing surface and the OG. cover of
the casing, which presses the crystals against this bearing surface,
are at the same time constructed to form a leak conductance.
11) A device according to one or more i 055 of the preceding claims,
characterised in that the crystals are constructed to form rings,
which surround the ignition pin.
12)
A device according to one or more 1 G of Claims 1-10,
characterised in that the crystals are constructed in the form of
discs, rods or the like, and are arranged eccentrically in relation to
the ignition pin c 15
13) A device according to one or more of the preceding claims,
characterised in that a plurality of pairs of crystals are provided,
which may be employed in parallel connection 120
14) A device according to one or more of the preceding claims,
characterised in that there are employed two or more pairs of
crystals, which are independent of each other, and which are connected
with inde i 25 pendent amplifiers and recording devices. so that each
measurement is performed on a double or multiple scale.
15) A piezo-electrical pressutre-neasuring device substantially as
hereinbefore 130 401,587 401,587 described and illustrated in the
accompanying drawings. Dated this the 10th day of April, 1933.
RADIOAKTIENGESELLSCHAFT, D S LOEWE, Dipl -Ing HU Ns-Hi Nqz Wou E,
(Chief Engineer of the Patent Dep) WATJTHER GTTZKE. Rediil: Printed
for Hi B Majesty'm Stitionery Office, by Love and Malcomson, Ltd
-1938. i 1 i i I i i i 1 i
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