Abstract: A twin clutch type transmission in which, when establishing a reverse gear position, the driving force of an engine (E) is transmitted to driven wheels (W, W) via the path: even-numbered gear clutch (Ce)?second input shaft (13)?second input shaft gear (22)?idle shaft second gear (42)?idle shaft first gear (41)?first countershaft first gear (23)?first countershaft (14)?first countershaft second gear (24)?third countershaft second gear (34)?first speed-third speed synchronizing device (36)?third countershaft (16)?third countershaft third gear (35)?second output shaft gear (46)?second output shaft (19)?final drive gear (44)?final driven gear (48)?differential gear (47).

Abstract: A twin clutch type transmission in which, when establishing a reverse gear position, the driving force of an engine (E) is transmitted to driven wheels (W, W) via the path: even-numbered gear clutch (Ce)?second input shaft (13)?second input shaft gear (22)?idle shaft second gear (42)?idle shaft first gear (41)?first countershaft first gear (23)?first countershaft (14)?first countershaft second gear (24)?third countershaft second gear (34)?first speed-third speed synchronizing device (36)?third countershaft (16)?third countershaft third gear (35)?second output shaft gear (46)?second output shaft (19)?final drive gear (44)?final driven gear (48)?differential gear (47).

Abstract: A wet multi-plate clutch supplies lubricating oil via a lubricating gallery from an inner circumferential surface of a cylindrical member of a clutch hub to a plurality of plates. The lubricating oil is appropriately supplied to a space between adjacent plates even under an idle neutral control. In the wet multi-plate clutch, a cylindrical member is divided into a plurality of areas having identical length in the circumferential direction, each area is provided with a group of lubricating gallery set consisting of a plurality of lubricating galleries formed at mutually different positions in the axial direction by shifting the positions of the plurality of lubricating galleries which constitute the group of lubricating gallery set in the circumferential direction.

Abstract: A process for sintering cubic system silicon carbide powder, which comprises compacting a mixture of cubic system silicon carbide powder with more than 1% by weight and not more than 3% by weight of carbon and at least 0.10% by weight and less than 0.3% by weight of boron and sintering the compact thereby obtained, under vacuum or in a chemically inert atmosphere at a temperature of from 1,900.degree. to 2,200.degree. C.

Abstract: Graphite fluoride, such as (CF).sub.n or (C.sub.2 F).sub.n, in powder form coated with a vinylic polymer, e.g. polymethyl methacrylate, which is bonding to the surfaces of the graphite fluoride particles by graft polymerization. The polymer-coated graphite fluoride retains unique properties of graphite fluoride such as high lubricating ability, can readily be dispersed in water and organic liquids, and can readily be press-shaped with or without the addition of a synthetic resin powder. The polymer-coated graphite fluoride is prepared by dispersing graphite fluoride in powder form and at least one vinylic monomer which undergoes radical polymerization in a mixture of water and either a water-soluble organic solvent or a surface-active agent, and then adding a polymerization initiator to the aqueous dispersion. The polymerization reaction takes place even at room temperature and can be promoted by heating up to 70.degree. C.