Inlet union for master cylinder

An inlet union for a master cylinder, said inlet union comprising:

• a plurality of independent duct members for supplying working fluid from a reservoir to pressure chambers in said master cylinder, said master cylinder having a plurality of sets of piston and pressure chambers arranged in series in an axial direction and a common attaching cover for attaching said duct members, wherein a flange portion is disposed at a periphery of said duct member, a circular raised portion whose outside diameter is smaller than that of said flange portion is integrally formed, at least one convex portion protruding radially is disposed at the outer periphery of said circular raised portion, attaching holes for said duct members are disposed in the top plate of said attaching cover, a plurality of concave portions corresponding to the convex portion of circular raised portion of said flange portion are disposed at the inner periphery of said attaching hole so that said convex portion of said duct member selectively engages with said concave portion of said attaching cover, and a depression is formed at the inner periphery of said attaching cover to mount the outer periphery of said flange portion, wherein said cover is attached to said master cylinder by coupling pins, bores for said coupling pins are formed at both sides of a coupling portion of said attaching cover for fixing said cover to said master cylinder, said cover further including an engaging tongue disposed at an intermediate position of each of said bores in such a manner as to protrude downward, a groove portion corresponding to said engaging tongue is disposed on each of said coupling pins, through holes are formed in an attaching portion of said master cylinder so that said through hole aligns substantially with the bores of said coupling portion when said attaching cover is fixed, said coupling pin is inserted in said bores of coupling portion of said attaching cover and said through hole of attaching portion of said master cylinder, and said engaging tongue is engaged with the groove portion of said coupling pin to maintain said coupling pin in position and couple said attaching cover to said master cylinder.

An inlet union for a master cylinder, said inlet union comprising:

• a master cylinder having a body with a plurality of sets of piston and pressure chambers arranged in series in an axial direction in said body;
• a plurality of independent duct members for supplying working fluid from a reservoir to said pressure chambers in said master cylinder body;
• and
• a common attaching cover, having a top plate, for attaching said duct members to said master cylinder body, wherein each duct member includes a flange portion having a flange diameter and disposed at a periphery of the duct member, said flange portion includes a circular raised portion whose outside diameter is smaller than that of said flange portion and is integrally formed with said flange portion, said circular raised portion includes at least one convex portion protruding radially at an outer periphery of said circular raised portion, said attaching cover including attaching holes for said duct members disposed in the top plate of said attaching cover, said attaching holes including a plurality of concave portions corresponding to the convex portion of circular raised portion of said flange portion disposed at an inner periphery of said attaching hole, wherein said convex portion of said duct member selectively engages with said concave portion of said attaching cover;
• and
• a depression is formed at the inner periphery of said attaching cover to mount each outer periphery of said flange portions.