Note: Descriptions are shown in the official language in which they were submitted.
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Background of the Invention
This invention relates to a brake-pad assembly for a spot-type disc -
brake comprising a carrier or backing plate with box-shaped recesses
and ~iction pads inserted and secured therein.
From the German Patent No. 1,183,806 a disc brake is known
wherein the carrier plate of the brake-pad assembly is provided with
box-shaped recesses which serve to receive the friction pads. The
friction pads are shaped like the sectors of a circle and have at their
rear sides metal supporting plates which are provided with spring clips
to secure the frlction pads in their box-shaped recesses. Each brake-
pad assembly carries two sector-shaped friction pads secured in their
associated box-shaped recesses which are disposed adjacent to one
another in the peripheral direction of the brake disc. A cross member
provided between the two box-shaped recesses defines a determined
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distance between the friction pads. I
This brake-pad assembly has the disadvantage that the sector-shaped
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design of the friction pads necessitates expensive and sophisticated
apparatus as well as large expenditure of work involved with the manu-
facture of the friction pads and the carrier plates.
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Summary of~the I vention
Therefore, it is an ob~ect of this invention to provide a brake-pad
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assembly for disc brakes which affords simple and cheap manu~acture and
permits optimum use to be made of the space available.
A feature o the present invention is the provision of a brake-pad
25assembly for a spot-type disc brake comprising: a carrier plate having a
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plurality of box-shaped recesses on a face of the carrier plates; and
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a friction pad inserted in and secured to each of the recesses, each of
the pads having the shape of a prism with a parallelogram cross-section
and each of the pads being disposed symmetrically with respect to one
another in the peripheral so that the pads approximate a sector of a
circle.
It is also possible to arrange a rectangular friction pad between the
two parallelogram-shaped friction pads.
The friction pads are advantageously manufactured separately irom
the carrier or backing plate and are connected with the latter preferably
by bonding. When using adhesive tape for bonding, this has the advan-
tageous e*ect of noise attenuation during operatlon.
The division of the friction face oi a brake pad into a number of
sectional faces, which is achieved by uslng several indivldual friction
pads, considerably reduces the risk of tear due to thermal stresses,
An economical and low-cost method of manufacture of such brake
pads comprises a plate made from frictional material having a thickness --~
corresponding to that of the desired friction pads is manufactured in the ~`
known manner by pressing and age-hardening, and a plurality of friction
pads are cut out of the plate having their iinal forms. Such plates
have the advantage that various sizes of friction pads can be cut out
and that they permit homogenous manufacture because the friction
material need, not flow into anchoring holes or recesses of the carrier
plate which causes cavitation in the structure and consequently leads
to lack of homogeneity. Further, such plates permit an improved and
more even through-hardening of the friction material~ ~`
An advantageous method of cutting the friction pads out of the plate
includes cutting parallel parting lines over both the whole length and the
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whole width of the plate with the longitudinal and transverse parting
lines running at angles unequal to 90 degrees.
In an embodiment of the brake-pad assembly constructed in accordance
with this invention, the friction pads are arranged on the carrier plate
in a spaced relationship to one another. This can be achieved by a
cross member separating the two box-shaped recesses. The space
between the two friction pads advantageously serves as a drain groove
and can also be used or receiving a pad-wear warning arrangement.
In a further advantageous embodiment of the inventive brake-pad ;
assembly, the friction pads have a different resistance to wear. This
avoids, on the one hand, that the friction pad on the entry side of the
- disc and the friction pad on the exit side of the disc wear unevenly and,
on the other hand, largely prevents disturbing noise during braking.
That portion of the friction pad which is inserted into the box-shaped
recess of the carrier plate may consist of a material whlch has for
example a coefficient of friction lower than that of the friction face and
preferably has a high degree of hardness.
Brief Description of the Draw n~L
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Above-mentioned and other features and objects of this invention will
become more apparent by reference to the following description taken in
conjunction with the accompanying drawing, in which:
Fig. 1 is a plan view of a brake-pad assembly in accordance with the
principles of the present invention;
Fig. 2 is a sectional view of the brake-pad assembly of Fig. l; and
Fig. 3 shows how friction pads are cut out of a plate o friction
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material in accordance with the principles of the present inventionO
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Description of the Preferred Embodimen-t
Figs. 1 and 2 show a carrier plate 1 of a brake-pad assembly, having
box-shaped recesses 2 and 2' into which friction pads 3 and 3' are inserted
and secured therein by bonding. Friction pads 3 and 3' are shaped in
the form of prisms having a parallelogram cross-sectional area. The two
box-shaped recesses 2 and 2' are separated from one another by a cross
member 4 thereby providing a space 5 between the friction pads 3 and 3'
which simultaneously serves as a drain groove. It is also possible
to arrange a pad-wear warning arrangement in space 5. The space 5 -~
defines an axis with respect to which the two ~iction pads 3 and 3' are
in symmetry such that they approximately form a sector of a circle.
In Fig. 3, a portion of a plate 7 made from i'riction material is shown, -
the thickness of which plate corresponds to the thickness 9 of the i'rlction
pads 3 and 3' and from which friction pads 3 and 3' are cut out in their
final forms by parallel parting lines 6 and 6' which run in longitudinal
and transverse direction of plate 7. Parting lines 6 and 6,' run at angles ,
8 unequal to 90 degrees so that the iriction pads 3 and 3' have the shape
oi parallelograms.
W,hile we have described above the principles of our invention in con-
nection with specific apparatus it is to be clearly understood that I:his
description is made only by way oi example and not as a limitation to the
scope of our invention as set forth in the objects thereof and in the
accompanying claims.
ACH:vm/gs ~'~
4/24/75
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