Abstract: This gearbox whose arrangement is derived from that of motorcycle gearboxes, comprises organs according to the invention enabling it to be adapted, in particular for a motor vehicle.The selector shaft (10) which ensures the ratio shift by means of forks (29, 30, 31) may be decoupled from the latter thanks to a decoupling shaft (11) which disengages the counter-cams forming one piece with the forks from their respective cams provided on the selector shaft (10).One can thus select any ratio shift without having to shift through the intermediate ratios.

Abstract: An internal combustion engine having an improved cooling circuit in which the liquid for cooling the cylinder block 1 and the cylinder head 2 circulates successively through an input orifice 16, the axis of which is perpendicular to the alignment of the cylinders, an annular chamber 34 formed by the cylinder liner 28, communication ducts 22-23 and 24-25, circulation channels 36 and an output orifice having a diameter less than that of the input orifice and located on the same face of the engine. Such engine, in a principal or auxiliary role, may be used to drive various types of appliances or other machines which preferably operate at constant operating conditions.

Abstract: The invention discloses an internal combustion engine in which the open housing oil pressure pump (1) is closed by securing it directly onto the cylinder head (5), the moving elements of the pump being fixed to the camshaft (20) by means of an axial abutment (29). Sealing is assured on the one hand by means of an O ring (25) between the pump (1) and the head (5), on the other hand by means of a lip seal (45) and a breather (51). The axial play (44), also affecting the sealing, is maintained at the desired amount by means of the levelled washer (47). The application is to all engines for which reduction in weight, volume and maintenance cost is sought.