Dual-system master cylinder
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorSusumu Kawakami
Life of this patent
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Abstract
A master cylinder assembly includes a cylinder having a large-diameter portion and a small-diameter portion. A piston body is slidably positioned within the cylinder, a front and a rear pressure chamber are provided. A first compensation port controls communication between a fluid reservoir and one of the pressure chambers. A large piston is slidably mounted around the piston body and cooperates with a second compensation port to control communication between the fluid reservoir and a brake fluid operating chamber. The piston body has a bore extending axially therethrough providing continuous fluid communication from the front pressure chamber to the rear pressure chamber.
Claims7
A dual-system master cylinder assembly comprising, in combination:
- a cylinder having a large-diameter cylinder portion and a small-diameter cylinder portion, said small-diameter cylinder portion having a head and said small-diameter cylinder portion being disposed in front of said large-diameter cylinder portion;
- a piston body having a front face and being positioned within said cylinder, said piston body having a diameter corresponding to that of said small-diameter cylinder portion and being slidably arranged for actuating pressure therein;
- a front pressure chamber defined between said head and said front face of said piston body;
- a rear pressure chamber;
- said piston body having means thereon for cooperating with a first compensation port to control communication between a fluid reservoir and one of said front and rear pressure chambers;
- a large piston slidably mounted around said piston body so as to be relatively movable thereon, said large piston having a front surface and a rear surface and means on said large piston adjacent said front surface for cooperating with a second compensation port to control communication between said fluid reservoir and a brake fluid operating chamber defined between said large-diameter cylinder portion, piston body, large piston front surface and a land between said large-diameter cylinder portion and small-diameter cylinder portion, said piston body including a bore extending axially therethrough providing continuous fluid communication from said front pressure chamber, defined between said head and said front face of said piston body, to said rear pressure chamber, said rear pressure chamber being defined by the wall of said large-diameter cylinder portion, surface of said piston body and said rear surface of said large piston.
Dependencies are inferred from the claim text.