Note: Descriptions are shown in the official language in which they were submitted.
8 1 2
Coil Body and Electrical Coil Created Therewith
The invention relates to a coil body for automatic coil
winding, especially RM coil bodies, composed of a
cylindrical winding body, a lower flange provided with
lateral projections forming wire guide slots and bearing
soldering tabs, and an upper flange having means for
receiving and entraining the coil body on automatic winders,
with the coil body being provided for use with a bipartite
core, said core surrounding the coil body over its height
jacketwise, and held together by an elastic clamping
arrangement, said core being shaped so that the lateral
projections of the lower flange and the means on the upper
flange for receiving and entraining the coil body are
located outside the core.
The invention likewise relates to an electrical coil with a
coil body of the species recited above, a core surrounding
the coil body heightwise, bipartite, and divided in a
horizontal plane, which covers the upper flange of the coil
body only partially, an elastic clamping arrangement that
holds the core together, and an elastic tolerance adjusting
element for securing the coil body in the receiving area
formed by the core.
Known coil bodies of the species recited above are
manufactured from phenolic resin or, for some time now, also
from modified unsaturated polyester resins (see DE 42 20 287
A1). Replacement of the previously conventional phenolic
resin by a modified UP resin results in a coil body that is
more temperature resistant, and can withstand even higher
soldering temperatures while retaining its dimensions. A
disadvantage of the UP coil body is its reduced stability,
which can be compensated in the vicinity of the lower flange
by a special structural design according to DE 42 20 287 A1.
The known coil bodies are known especially in the embodiment
of an "RM coil body" whose dimensions are specified in DIN
Standard 41981. The known coil bodies regularly have in the
upper flange a V- or U-shaped recess, in other words one
that is open radially outward, into which a suitably-shaped
matching part of the automatic winder can engage in order to
entrain and position the coil body in the automatic winder.
This coil body design which has existed for many years has
proven itself in practice. However for some time there has
been a wish to improve the stability, especially of the
upper flange. A sturdier design of the upper flange, which
is obvious of itself, is opposed by the standardized
dimensions of the coil body on the one hand and the
undesirable reduction of the winding space on the other.
The known winding bodies are used together with jacket cores
which are made bipartite and have an impact plane located
centrally with respect to the coil body and parallel to the
flanges. The core surrounds the coil body jacketwise over
its height, and therefore fits around the top and bottom of
the coil body as well two opposite parts of the jacket
surfaces over its width. The core is designed so that the
lateral projections on the lower flange are not covered by
the core laterally externally heightwise owing to the
sections of the upper flange. Since the core surrounds the
coil body jacketwise over its height, it forms a rigid
receiving space for the coil body. Since manufacturing
tolerances influence the relative size of coil bodies with
respect to the receiving space of the core, the receiving
space of the core is manufactured with a slight excess, and
an elastic tolerance compensating disk on the upper flange
of the coil body is installed before the core is closed by
means of an elastic clamping arrangement composed of two
lateral clamps. The elastic tolerance compensating element
holds the coil body firmly and rattle-free in the receiving
space of the core.
The statement of the problem that forms the basis of the
invention consists in permitting increased stability of the
coil body in the vicinity of the upper flange by means that
permit adherence to standard DIN 41981.
To solve this problem a coil body of the species recited at
the outset is characterized according to the invention by
the upper flange being made solid without any recesses and
by the means for receiving and entraining the coil body on
automatic winders being formed by ribs located on the top of
the upper flange, said ribs delimiting a receiving space
that is open radially outward.
According to the invention therefore a variation is made on
the design, known for decades, for RM coil bodies to be
wound fully automatically, without losing the advantages of
this design with regard to its handling by automatic
winders. This is accomplished by virtue of the fact that,
as a means for receiving and entraining the coil body in
automatic winders, a recess is no longer provided in the
upper flange but ribs are provided instead on the top of the
flange which can perform the same function without reducing
the resistance of the upper flange to breakage, as a recess
does. The invention is based on the knowledge that such a
partial increase in height is possible because the ribs
molded on the top of the upper flange project into a free
space next to the jacket core and therefore do not adversely
affect the previous design of the electrical coils, even
within the framework of the DIN guideline.
Preferably, two ribs at an angle to one another delimit a V-
shaped receiving area.
1 2
The increase in stability of the coil body that can be
achieved according to the invention in the vicinity of the
upper flange permits an expansion of the range of
applications for the UP coil bodies that are advantageous
for thermal reasons. However, the invention offers
advantages even for the previous phenolic coil bodies that
suffered no stability problems, because increasingly thicker
winding wires are being used which exert a higher load on
the coil body, especially on the upper flange, during the
winding process.
The invention will now be described in greater detail with
reference to the drawing, in which an embodiment of the coil
according to the invention is contrasted with the previously
used, known design.
Figure 1 is a section made heightwise through a coil
according to the prior art;
Figure 2 is a top view of the coil arrangement according to
Figure 1;
Figure 3 is a section made heightwise through an embodiment
of a coil according to the invention, rotated through 90
with respect to Figure 1;
Figure 4 is a top view of the arrangement shown in Figure 3.
The electrical coil shown in Figures 1 and 2 according to
the prior art has a coil body 1 and a ferromagnetic core 2.
Coil body 1 consists of a hollow cylindrical winding body 3
delimited at the bottom by a lower flange 4 and at the top
by an upper flange 5. On the outer jacket of winding body
3, an electrical winding (not shown) is wound and flanges 4
2 ~ 2
and 5 delimit the winding space at the top and bottom. Coil
body 1 is surrounded jacketwise over its height by core 2,
with core 2 consisting of two core halves 6 and 7. Core
halves 6 and 7 abut one another in a horizontal plane 8
which lies parallel to flanges 4 and 5 and is located
halfway up coil body 1.
Core halves 6 and 7 are held together by two clamps 9 which
fit over core halves 6 and 7 from the bottom and top and
press core halves 6 and 7 elastically against one another.
Figure 2 shows that core halves 6 and 7 are slightly
narrowed centrally at the top and bottom of coil body 1 and
only partially cover flanges 4 and 5 of circularly
cylindrical coil body 1. In the part of top flange 5 that
is not overlapped, an approximately V-shaped recess 10 is
provided which serves to receive and entrain coil body 1 in
a winding machine.
Bottom flange 4 is provided with lateral projections 11 that
project transversely with respect to the lengthwise
direction of core 2 from bottom flange 4, each forming a
wire guide slot 12 and bearing soldering tabs 13.
In this known coil arrangement, coil 2 forms a receiving
area for coil body 1. To compensate for manufacturing
tolerances, an elastic annular disk 15 is inserted as a
tolerance compensating element on the top of upper flange 5
of coil body 1, said disk, depending on the remaining
distance between coil body 1 and the top of receiving space
14, being compressed to a greater or lesser degree, but in
any event ensuring a rattle-free seat for coil body 1 in
receiving space 14 of core 2.
21~7812
The section shown in Figure 3, made heightwise through a
coil body according to the invention, is rotated through 90
with respect to the sectioning plane according to Figure 1.
Lower flange 104 of coil body 101 according to the invention
with its projections 111 is unchanged from flange 4 of coil
body 1. Winding body 103, with the core having the same
size, has a slightly greater height since the elastic
annular disk 15 that serves as a tolerance compensating
device has been eliminated. Upper flange 105 is made
without a recess 10 opposite flange 5, and in the embodiment
shown has the form of a circular disk of a constant
thickness. To preserve advantageous handling in a winding
machine, upper flange 105 is provided on its top with two
ribs 110 at an angle to one another and delimiting an
approximately V-shaped receiving space into which a
correspondingly-shaped receiver and driver of the winding
machine can be inserted laterally so that the position of
the coil body 101 is fixed.
Clamping arrangement 109 is made in one piece in the
embodiment according to the invention and extends laterally
over the entire top of core 2 by two legs beneath the
underside of lower core half 106, in order thus to press the
two core halves 106 and 107 against one another in contact
plane 108. In addition, clamp 109 on the top of core 102 or
of upper core half 107 is provided with two lateral
projections 116, 117 that extend over the width of core 102
and press with downwardly bent flexible ends 118 and 119 on
the top of upper flange 105 of coil body 101. The leg 118
that is bent downward is bent at less than 90 and lies at
an angle to ribs 110. On the other hand, leg 119 is bent
nearly at a right angle and extends directly to the surface
of upper flange 105 since there are no ribs 110 in its
vicinity. To improve elastic support, leg 119 is crimped
slightly outward at its free end 120.
~lfi7~2
Thus it is evident that clamp 109 in the embodiment shown
not only has the function of holding the two core halves 106
and 107 together, but also are pressing coil body 101 with
an elastic pretensioning against the lower wall of receiving
space 114 in order in this manner, even with slight
manufacturing tolerances, to ensure a firm and rattle-free
seat of coil body 101 in receiving space 114 of core 102,
which in the embodiment shown is greater by tolerance range
T than coil body 101 since the section part of upper core
half 107 projects into the interior of hollow cylindrical
coil body 101.
By virtue of the continuous design of upper flange 105 the
mechanical stability as well as the resistance to voltage
sparkover of coil body 101 is improved, with advantageous
handling in a coil-winding machine being retained because of
ribs 110. In the construction of the coil according to the
invention, ribs 110 are located next to core 102 and
therefore in no way contribute to an enlargement of the
total construction.
