摘要:
A friction disc comprising a support of generally plane shape, having on its periphery curved portions which can be flattened, while offering elastic resistance, when the disc is subjected to a clamping action, friction linings disposed on each side of the support and secured by rivets to the curved portions thereof so that the thickness of the disc and the linings is elastically variable with a lower limit corresponding to complete flattening of the curved portions of the support, and stop means interconnecting the linings and acting in a direction parallel to the axis of the disc to define an upper limit for the thickness of the disc at the linings.
摘要:
A fluid-pressure-modulation device intended to be interposed between any hydraulic control and any receiver device, especially for the braking circuits of automobile vehicles, comprises essentially a first chamber connected to the control and a second chamber connected to the receiver. The chambers communicate with each other through a first passage controlled by a regulating valve which is normally closed, and also through a second passage formed axially in the regulating valve and controlled by an isolating valve which is normally open. The regulating and isolating valves form conjointly a valve unit which is movable in the first chamber and has a guiding tail slidably engaged in a fluid-tight manner in a bore coupled to the second chamber. The isolating valve is integrally housed in the regulating valve, and the guiding tail of the valve unit is carried by the regulating valve.
摘要:
In a clutch having two clutch assemblies disposed axially one behind the other controlled respectively by two clutch release levers, the control means for the clutch release levers comprise two operative elements mounted for axial movement in opposite directions, one of the elements being adapted to apply a thrust to one clutch release lever and the other of the elements being adapted to apply a traction to the other clutch release lever, operating means being interposed between the said elements to simultaneously move the elements in opposite directions.
摘要:
Crosslinked polybenzoxazole copolymer of the general formula:
IN WHICH THE RADICALS R, R'' and R'''' have the following meaning: R -H or R''; R'' -O-, -OCH2-, -NH- or - CH2CHOH-; and R'''' is a polymeric radical corresponding to at least one resin chosen from the group comprising phenoplasts, aminoplasts, epoxy resins, oily polymers of phosphonitrile chkoride, alkyd resins, polyurethanes, polyimides, polyimide-amides, poly-bismaleimides and silicones. This copolymer is prepared by polycondensation of a linear or crosslinked polyamide with one or more polymers corresponding to the group R'''' in the presence of a cross linking agent in the case of a linear polyamide.