Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
1998-12-14
2001-01-16
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
C073S767000
Reexamination Certificate
active
06173615
ABSTRACT:
TECHNICAL FIELD
This invention relates to a sensing device particularly of the strain gauge type suitably used for measuring a loaded weight of a truck or the like.
BACKGROUND ART
Recently, vehicles, such as a truck, running while loaded with heavy goods, have been regarded as having problems that the vehicle brings about a traffic accident, such as lateral turning, and that the vehicle and the road surface are subjected to extremely-premature deterioration.
One cause of these problems is overloadage, and in order to prevent this overloadage; the load, carried by the vehicle, that is, the load acting on the vehicle, has heretofore been measured.
The load, carried by the vehicle, has heretofore been measured while placing the vehicle to be measured on a platform scale called a truck weight scale. However, this facility is large, and requires a large installation space, and therefore the number of the platform scales, that can be installed, is limited, and many vehicles can not be measured, and besides the installation cost is high.
Therefore, recently, there has been provided a load measuring apparatus which is mounted on the vehicle so as to measure the load.
For example, in Japanese Patent Application No. Hei. 7-124860 proposed by the present applicant, attention is directed to the fact that a shackle
34
is provided between one end of a leaf spring
31
(the other end of which is connected to a bed frame
32
through a bifurcated bracket
33
) and another bracket
33
connected to the bed frame
32
, as shown in
FIG. 12
which is a perspective view, and a load-measuring sensing device of the strain gauge type, such as a strain gauge type sensor, is mounted in a shackle pin
5
which rotatably connects the shackle
34
to the bracket
33
, and the load is calculated based on the sum of values measured by the plurality of sensing devices corresponding to wheels.
FIG. 13
is a cross-sectional view showing the arrangement of the sensing device within the shackle pin, and receiving portions
5
a
and
5
b
are formed respectively in axial end portions of the shackle pin
5
, and the two receiving portions
5
a
and
5
b
communicate with each other through a communication hole
5
c
within the shackle pin
5
.
Within one receiving portion
5
a
of the shackle pin
5
, the sensing device
7
is received in a first case assembly
9
, and within the other receiving portion
5
b
of the shackle pin
5
, the sensing device
7
is received in a second case assembly
11
.
As shown in
FIG. 14
which is a perspective view, each of the conventional sensing devices
7
, received respectively in the two receiving portions
5
a
and
5
b
of the shackle pin
5
, includes a plate-like member
7
a
, and a coil
7
g
serving as a sensing portion.
The plate-like member
7
a
is made of a magnetic material such as permalloy, and has a substantially rectangular, flattened shape as seen in a plan view, and includes a coil portion
7
b
disposed at a substantially longitudinally-central portion thereof, and fixing portions
7
c
and
7
c
defined respectively by opposite end portions thereof. Notches
7
e
of a substantially semi-circular shape for alleviating stresses acting on the plate-like member
7
a
are formed respectively in four portions of opposite edges of the plate-like member
7
a
spaced from each other in a widthwise direction perpendicular to the above longitudinal direction, and these four portions are disposed respectively at the boundaries between the coil portion
7
b
and the two fixing portions
7
c
and
7
c
. Four through-holes
7
f
are formed through the coil portion
7
b
delimited by the four notches
7
e
, and are spaced from one another in the longitudinal and widthwise directions.
The coil
7
g
includes two magnet wires
7
h
constituting a cross coil, and these magnet wires
7
h
are coated with an insulating material (not shown) such as enamel.
One of the two magnet wires
7
h
is wound through the two through-holes
7
f
and
7
f
opposed to each other in the longitudinal direction, and its opposite end portions are extended outwardly from the two through-holes
7
f
and
7
f
, respectively. The other magnet wire
7
h
is wound through the two through-holes
7
f
and
7
f
opposed to each other in the widthwise direction, and its opposite end portions are extended outwardly from the two through-holes
7
f
and
7
f
, respectively.
The sensing devices
7
of this construction are received respectively in the first case assembly
9
and the second case assembly
11
, and in this condition these sensing devices are received respectively in the two receiving portions
5
a
and
5
b
of the shackle pin
5
normally in such a posture (as shown in
FIG. 13
) that the longitudinal direction of the plate-like member
7
a
is disposed in the direction of the axis of the shackle pin
5
extending in a direction B of a width of a vehicle while the widthwise direction of the plate-like member
7
a
is disposed in a direction A of a height of the vehicle, and one fixing portion
7
c
is associated with the bracket
33
while the other fixing portion
7
c
is associated with the shackle
34
.
In this condition, the axis of winding of the magnet wire
7
h
, wound through the two through-holes
7
f
and
7
f
opposed to each other in the longitudinal direction of the plate-like member
7
a
, and the axis of winding of the magnet wire
7
h
, wound through the two through-holes
7
f
and
7
f
opposed to each other in the widthwise direction of the plate-like member
7
a
, are both disposed in a plane including the longitudinal direction and widthwise direction of the plate-like member
7
a
, that is, in a plane including the direction A of the height of the vehicle and the direction B of the width of the vehicle.
In the sensing device
7
, when electric current is caused to flow either between the opposite ends of one magnet wire
7
h
, wound through the two through-holes
7
f
and
7
f
opposed to each other in the longitudinal direction of the plate-like member
7
a
, or between the opposite ends of the magnet wire
7
h
, wound through the two through-holes
7
f
and
7
f
opposed to each other in the widthwise direction of the plate-like member
7
a
, a magnetic field is produced in the plate-like member
7
a
, so that induced current flows between the opposite ends of the other magnet wire
7
h.
In this condition, the load is applied to the plate-like member
7
a
from the bed frame
32
through the bracket
33
, the shackle
34
and the opposite ends of the shackle pin
5
, and the bracket
33
is moved relative to the shackle
34
in the direction A of the height of the vehicle, so that the plate-like member
7
a
is strained in the direction A of the height of the vehicle, and at this time the direction of the magnetic field in the plate-like member
7
a
is changed, so that the induced current, flowing between the opposite ends of the other magnet wire
7
h
, is changed.
Therefore, the current, having a magnitude corresponding to the load acting on the plate-like member
7
a
, is obtained as an output signal from the opposite ends of the other magnet wire
7
h.
Incidentally, the above-mentioned problems that the vehicle brings about a traffic accident, such as lateral turning, and that the vehicle and the road surface are subjected to extremely-premature deterioration are not always caused by the overloadage of the vehicle, and these problems can occur also when the acceleration and deceleration are effected abruptly with a considerable loaded weight.
Therefore, in a vehicle such as a truck, it is desirable to measure a change of the load in a forward-backward direction C (see
FIG. 12
) of the vehicle so that the acceleration/deceleration can be grasped together with the load.
However, the above conventional sensing device
7
is originally provided for the purpose of detecting only the load, that is, the loaded weight, acting in the direction A of the height of the vehicle, and therefore when the sensing device is mounted in the shackle pin
5
, the axes of winding of
Noori Max
Sughrue Mion Zinn Macpeak & Seas, PLLC
Yazaki -Corporation
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