Brakes – Elements – Brake wheels
Patent
1992-01-22
1994-04-05
Graham, Matthew C.
Brakes
Elements
Brake wheels
411501, F16D 6512, F16D 6904, F16D 1364
Patent
active
052996670
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of constructing a carbon composite laminated structure in the form of a friction disc of the kind comprising a layer of carbon composite material, such as a carbon-carbon composite material, having edge formations whereby the disc may slide axially relative to but remain rotationally fixed relative to a support structure (such as a structure associated with an axle or a wheel), and to a laminated structure resulting from the method. It relates in particular, though not exclusively, to a method of manufacture of a laminated structure for use at high temperatures, such as those experienced by the carbon-carbon composite rotor and stator friction discs of an aircraft brake assembly.
Friction discs of carbon composite material are extremely expensive to produce. Thus as well as seeking to maximise the wear life of such discs, strenuous efforts inevitably have been made to ensure that the maximum possible benefit is derived even from the material of fully worn discs.
The specification of GB-A-2167821 describes one known and now well established technique by which friction discs may be refurbished. This specification teaches that worn discs may be machined to half of the thickness of a new disc and that pairs of such machined discs may be united by a brazing technique thereby to result in a refurbished type of friction disc of a thickness corresponding to that of a conventional new disc.
The brazing technique is found to work well and the resulting refurbished discs exhibit good performance in use. However, the brazing technique is notable for requiring the use of specialised equipment. Despite this limitation, no viable alternatives have been proposed so far concerning any alternative and potentially more convenient techniques for refurbishing friction discs.
The subject invention seeks to provide an improved laminated structure in the form of a friction disc and method of constructing a laminated structure of a kind comprising a layer of carbon composite material.
In accordance with one aspect of the present invention a method of constructing a laminated friction disc comprises providing a first disc layer of carbon composite material which provides a wear surface and a second disc layer which also provides a wear surface and arranging said wear surfaces facing away from each other, each said layer of said disc having key formations whereby the disc may slide axially but remain rotationally fixed relative to a support structure, forming holes in each of said layers either before or after arranging said layers relative to one another with the holes in the first layer extending through said wear surface and with the holes in said second layer aligned with the holes in the first layer, positioning fastening means to extend through aligned pairs of holes and arranging said fastening means to secure said layers relative to one other with each said fastening means lying wholly below and spaced from said wear surfaces.
Preferably the fastening means lie spaced wholly below said wear surface by a distance greater than the wear allowance of the disc. Thus the fastening means is below the wear surface at all times in subsequent normal use.
The invention further provides a method for increasing the effective thickness of a layer of carbon composite material of a friction disc by utilising for the second layer a layer which is also of carbon composite material.
More than two layers may be laminated together, in which case individual fastening means may extend through either all or only fewer than all the layers. Some fastening means may serve to connect together some of a plurality of layers and other fastening means may act between one or some of those layers and the other layers of the plurality.
The invention may be employed to laminate together two layers of corresponding shape and size in a manner in which confronting surfaces of the layers are wholly in contact with one another. Alternatively it may be employed to laminate two components of different shape and size in a manner in w
REFERENCES:
patent: 357118 (1887-02-01), Dion
patent: 2562721 (1951-07-01), Jakosky
patent: 3212427 (1973-01-01), Cook et al.
patent: 3724613 (1973-04-01), Bermingham
patent: 3724614 (1973-04-01), Bender
patent: 3804213 (1974-04-01), Lucien et al.
patent: 4043437 (1977-08-01), Taylor
patent: 4146118 (1979-03-01), Zankl
patent: 4580673 (1986-04-01), Graton
patent: 4982818 (1991-01-01), Pigford
Dunlop Limited a British Company
Graham Matthew C.
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