Patent ID: 7658207

Claim:
A hydraulic pressure reservoir for accumulating hydraulic pressure, said hydraulic pressure reservoir comprising: at least one pressure chamber for retaining a predetermined hydraulic fluid pressure for subsequent release and having a fluid connection with an external hydraulic circuit, wherein the at least one pressure chamber is formed between a movable partition and a fixed partition positioned in a housing; a pressure limiting valve operatively connected with the at feast one pressure chamber; wherein the movable partition is formed by a diaphragm spring; wherein the fixed partition is in the form of a control plate having predetermined passageways for providing a fluid connection of the at least one pressure chamber with the external hydraulic circuit, and a flange ring is connected to an outwardly-facing flange surface of the control plate for releasably securing the diaphragm spring relative to the control plate; and wherein the flange ring includes an annular recess having a U-shaped cross section on a side of the flange ring facing the at least one pressure chamber, and a wire ring positioned between the diaphragm spring and the U-shaped shaped recess; and wherein upon deflection of the diaphragm spring a radially-outwardly-lying region of the diaphragm springs undergoes a radial movement relative to the flange ring.