Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2001-07-16
2003-10-28
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
Reexamination Certificate
active
06637260
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary sensor, and more particularly to a rotary sensor capable of accurately detecting an angle of rotation to be transmitted from the outside.
2. Description of the Related Art
With reference to the drawings, the description will be made of a conventional rotary sensor.
FIG. 18
is a sectional view showing a conventional rotary sensor under application by Japanese Patent Laid-Open Application No. 2000-74611 and U.S. Pat. Ser. No. 09/388,392 corresponding thereto,
FIG. 19
is a sectional view showing a conventional rotor for rotary sensor,
FIG. 20
is a front view showing the conventional rotor for rotary sensor,
FIG. 21
is a perspective view showing a conventional elastic member for rotary sensor,
FIG. 22
is a front view showing a conventional driving shaft for rotary sensor, and
FIG. 23
is a side view showing a conventional driving shaft for rotary sensor.
As shown in
FIG. 18
, the conventional rotary sensor has a casing
30
disposed which is substantially cylindrical in external shape and is made of thermosetting resin or the like, and this casing
30
has a front side plate
30
a
formed on the upper side thereof, and at the central portion of the front side plate
30
a,
there is formed a shaft hole
30
b.
Inside the casing
30
, there is formed a substantially cylindrical storage portion
31
, and within the storage portion
31
, there is housed a rotor
32
. This rotor
32
has, as shown in
FIGS. 19 and 20
, a disk-shaped collar portion
32
a,
and at the underside of the collar portion
32
a,
a shaft portion
32
b
having a small outside diameter, and on the upper side, a bearing portion
32
c
having a large outside diameter are projectingly formed respectively.
The bearing portion
32
c
is formed with a difference in level
32
d,
a tip end portion
32
e
above the difference in level
32
d
is formed to have a smaller outside diameter than the difference in level
32
d.
Thus, the tip end portion
32
e
is inserted into the shaft hole
30
b
of the casing
30
in such a manner that the rotor
32
can rotate with the center line A as the center of rotation within the storage portion
31
.
On the side of the collar portion
32
a
at the underside, there are projectingly formed a plurality of protrusions
32
f,
on the basis of which a moving contact piece to be described later will be positioned to be mounted.
At the center of rotation of the bearing portion
32
c,
there is formed an engaging hole
33
having a predetermined depth, and this engaging hole
33
consists of a flat portion
33
a
and a circular arc portion
33
b,
is shaped like a D-character as viewed from the front, and a periphery of the inlet portion
33
c
is chamfered for formation.
Adjacent the flat portion
33
a
of the engaging hole
33
, and in parallel to the flat portion
33
a,
there is formed a groove portion
34
having predetermined depth and width dimensions.
Between the groove portion
34
and the flat portion
33
a
of the engaging hole
33
, there is formed a partition wall
35
, and this partition wall
35
is formed with an open portion
36
for communicating the engaging hole
33
to the groove portion
34
at a predetermined depth from the inlet portion
33
c
of the engaging hole
33
. Since this open portion
36
is, as shown in
FIG. 20
, formed to be smaller than the width dimension of the groove portion
34
, the partition wall
35
protrudes on both sides of the open portion
36
.
The groove portion
34
is adapted to be inserted by an elastic member
37
including a plate spring. As shown in
FIG. 21
, a proximal portion
37
a
is stamped out by means of a press or the like to form a portion left by stamping out
37
b,
and the elastic member
37
is formed with a tongue piece-shaped elastically-contacted portion
37
c
and a loose-stop portion
37
d
enclosed by the portion left by stamping out
37
b.
The elastically-contacted portion
37
c
is projectingly formed upwardly by being curved in a mountain shape, and at the underside on the opposite side to a direction that this elastically-contacted portion
37
c
projects, there is provided the loose-stop portion
37
d
formed by raising up.
The elastic member
37
has a through-hole
37
e
having a predetermined hole diameter formed by stamping out at the curved apex portion of the elastically-contacted portion
37
c,
and at the end portion on the right side, there is formed a supporting portion
37
f
having a predetermined height dimension, bent downward in the same direction as the loose-stop portion
37
d.
Thus, when the elastic member
37
is inserted into the groove portion
34
, the loose-stop portion
37
d
on one side comes into elastic contact with between the side walls of the lower part of the groove portion
34
, while the supporting portion
37
f
on the other side abuts against the side wall of the groove portion
34
.
By means of an elastic force of the loose-stop portion
37
d,
the flat proximal portion
37
a
mainly comes into elastic contact with the partition wall
35
at the side of the open portion
36
so that the elastic member
37
is prevented by the groove portion
34
from falling off and is held.
Also, when the elastic member
37
is inserted into the groove portion
34
, the curved apex portion of the elastically-contacted portion
37
c
is adapted to go through the open portion
36
for projecting on the engaging hole
33
side to be positioned.
Also, on the side, on which the shaft portion
32
b
at the underside of the collar portion
32
a
of the rotor
32
, has been formed, there is mounted a moving contact piece
38
with a spring operation, which is a part of the angle of rotation detecting member. This moving contact piece
38
is, as shown in
FIG. 18
, positioned by a plurality of protrusions
32
f
formed on the collar portion
32
a,
and is fixed to the rotor
32
by means of thermal caulking or the like.
On a side opposite to the surface, onto which the moving contact piece
38
has been mounted, a resistor substrate
39
is positioned with a predetermined clearance spaced within the casing
30
, and is fixed by means of adhesive or the like.
On the surface of the resistor substrate
39
, a resistor pattern (not shown) is formed by means of printing or the like, and the moving contact piece
38
is adapted to come into elastic contact with this resistor pattern.
Also, at the central portion of the resistor substrate
39
, there is formed a shaft hole
39
a,
through which the shaft portion
32
b
of the rotor
32
is inserted. The angle detecting member is constituted by the moving contact piece
38
and the resistor substrate
39
having the resistor pattern.
On the right side of the resistor substrate
39
shown in
FIG. 18
, a plurality of substantially L character-shaped external terminals
40
are made integral with the casing
30
by means of insert molding or the like. Correspondingly to the resistor pattern (not shown), the external terminals
40
are connected to a terminal
50
drawn out of the end surface of the resistor substrate
39
by means of soldering or the like.
At the underside of the resistor substrate
39
, a cover body
41
for closing the storage portion
31
within the casing
30
as a cover is mounted by means of adhesive or the like in such a manner that the interior of the storage portion
31
is hermetically sealed. On the side of the interior of the cover body
41
on the center line A, such a bearing portion
41
a
as shown in
FIG. 18
is projectingly formed, and the shaft portion
32
b
of the rotor
32
is supported by this bearing portion
41
a
so that the rotor
32
is prevented from moving in a direction perpendicular to the direction of the center line A for causing no clutter.
In order to detect an angle of rotation of a throttle valve of, for example, an automobile or the like through the use of a conventional rotary sensor having the above-described structure, the casing
30
is first mounted to the main body of a throttle body (not
Alps Electric Co. ,Ltd.
Beyer Weaver & Thomas
Lefkowitz Edward
Stevens Maurice
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