Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1997-05-09
1998-10-06
Poon, Peter M.
Brakes
Wheel
Axially movable brake element or housing therefor
188 22E, 188 25G, 188 111L, F16D 6538
Patent
active
058163700
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a disc brake lining in particular with a noise-damping plate and the fastening thereof to the lining support plate.
Noise-damping plates are generally stuck onto the side of the lining support plate remote from the friction lining with cold- or hot-setting polymer layers. The nature of this polymer layer is crucial for the noise-damping properties of the plate. Viscoelastic polymers promote the noise-damping properties of the plate and are preferably used. Such polymer layers are, however, temperature sensitive and can frequently not transmit the shear forces which are produced when braking, to a satisfactory extent at high temperatures. Means are therefore additionally provided which secure the plates against slipping sideways. Such means which absorb shear forces include, in the prior art, flanged noise-damping plate formations which engage around the side surfaces of the support plates. It is also known to press the noise-damping plate into recesses in the support plate. The connection produced between the support plate and the noise-damping plate in these known solutions still did not have the desired reliability under certain conditions and loads.
It is known from EP-A 0373333 to rivet the noise-damping plate together with a mounting spring onto the support plate and to secure it against rotation with the aid of local recesses or guide lugs, which engage in the corresponding support plate recess. The head of the rivet projects in this known construction outwardly out of the plane of the noise-damping plate and can impair the function of the pressure mechanisms of the brake. A vibration bridge can be formed by a metallic connection between the carrier plate and noise-damping plate whereby the noise-damping properties are impaired. Reference is made to the significance of such vibration bridges in DE-A 4104812.
It is the object of the invention to provide a disc brake lining provided with a noise-damping plate in which a satisfactorily strong and reliable connection is produced between the carrier plate and the noise-damping plate without noticeable side effects.
In a disc brake lining with a lining support plate, a friction lining pressed onto one side of the lining support plate and a noise-damping plate fastened to the other side of the lining support plate by means of an adhesive layer, this object is solved in accordance with the invention if the lining support plate has at least two through openings which are at least partially filled with underlayer composition and/or friction composition and are each provided with a countersunk bore; if the noise-damping plate has holes and is conically deformed in alignment with the countersunk bores; if a countersunk screw is screwed into each countersunk bore such that its head draws the portion of the noise-damping plate which is conically deformed and aligned with the countersunk bore into the broadened portion of the countersunk bore, whereby the adhesive layer between the noise-damping plate and the broadened portion of the countersunk bore is under pressure and the head of the countersunk screw is completely received in the conically deformed portion of the noise-damping plate.
Since the underlayer composition or the friction composition itself has a vibration damping effect and the free surface of the noise-damping plate is provided with a lacquer, no vibration bridges are generally produced. An additional vibration damping effect can be achieved if a damping disc, e.g. one of a high temperature resistant rubber, is introduced between the screw head and the noise-damping plate and/or the screw head is coated with a damping lacquer. Another possibility for achieving additional damping properties resides in bonding the countersunk screw in the countersunk bore with an elastic adhesive.
For disc brake linings without a mounting spring, but with a riveted on chatter prevention spring, the solution in accordance with the invention of the problem referred to above resides in the features of "FIG. 3 and accompanying descriptions".
The
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Eckert Armin
Verbeeten Wilhem
Poon Peter M.
Rufas Pagid Aktiengesellschaft
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