Hydraulic pressure reservoir

1. 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.

2. A hydraulic pressure reservoir in accordance with claim 1 , wherein the diaphragm spring includes a ring-disk-shaped diaphragm spring body with a center opening, and an inner cover carried within the center opening to close the pressure chamber off from the outside.

3. A hydraulic pressure reservoir in accordance claim 2 , wherein the inner cover includes an annular recess having a U-shaped cross section on a surface facing the diaphragm spring, and a wire ring is positioned between the diaphragm spring and the U-shaped recess, wherein upon deflection of the diaphragm spring a radially-inwardly-lying region of the diaphragm spring undergoes a radial movement relative to the inner cover.

4. A hydraulic pressure reservoir in accordance with claim 2 , including a first sealing element positioned between the inner cover and the diaphragm spring, and a second sealing element positioned between the diaphragm spring and the control plate.

5. A hydraulic pressure reservoir in accordance with claim 2 , wherein the inner cover includes a throughbore in which the pressure limiting valve is positioned.

6. A hydraulic pressure reservoir in accordance with claim 5 , wherein the pressure limiting valve includes a valve body having a conically-shaped sealing surface facing the inner cover, and a threaded bolt carried in a threaded throughbore of the valve body.

7. A hydraulic pressure reservoir in accordance with claim 6 , wherein the valve body is secured in position on the threaded bolt by a lock nut, and a searing surface is provided between the lock nut and the valve body.

8. A hydraulic pressure reservoir in accordance with claim 1 , wherein the control plate includes a bore for receiving components of the pressure limiting valve.

9. A hydraulic pressure reservoir in accordance with claim 8 , wherein a shoulder is provided within the control plate bore against which a head of the threaded bolt comes to rest upon an increase in pressure within the at least one pressure chamber above a threshold pressure value, to move the diaphragm spring away from and to open the pressure limiting valve.

10. A hydraulic pressure reservoir in accordance with claim 1 and including two pressure chambers with adjacent fixed partitions and only one fluid connection to the external hydraulic circuit, wherein the two pressure chambers are connected so that pressure forces exerted on the respective fixed partitions are mutually offset at a fixed partition contact plane.

11. A hydraulic pressure reservoir in accordance with claim 10 , including an intermediate plate positioned between the fixed partitions, wherein the intermediate plate includes bores for providing fluid connection of predetermined passageways of the fixed partitions.

12. A hydraulic pressure reservoir in accordance with claim 10 , wherein the fixed partitions are connected by means of threaded bolts that pass through respective flange surfaces and respective flange rings.