Valve of a storage device with a spring element

Abstract

Valve (48) of a storage device (38), which is formed with a storage cylinder (40) and a storage piston (42) guided therein, with a valve sealing body (50) for selectively opening and closing a valve opening (58) on a valve seat (54) and an opening means (70) for selectively lifting the valve sealing body (50) from the valve seat (54), in which the opening means (70) is held by a spring element (64), characterized in that the spring element (64) is formed with a punched and bent part and the spring element (64) is designed with an annular holding section (66) which is formed with an annular disc (67) punched out of a base plane (65) of the punched and bent part.

Description

State of the art

[0001] The invention relates to a valve for a storage device formed with a storage cylinder and a storage piston guided therein. The valve comprises a valve sealing body for selectively opening and closing a valve opening at a valve seat and an opening means for selectively lifting the valve sealing body from the valve seat, which opening means is held by a spring element. Furthermore, the invention relates to the use of such a valve in a storage device, in particular for a hydraulic unit of a vehicle brake system.

[0002] Generic accumulator devices are used primarily in vehicle braking systems and serve to temporarily store pressure medium in the form of brake fluid. The pressure medium is either returned from wheel brake cylinders or supplied from a main accumulator of the vehicle braking system, for example, in vehicle braking systems with anti-lock braking systems (ABS) and electronic stability programs (ESP).

[0003] Valves in storage devices of hydraulic units, especially vehicle brake systems, are used to control the amount of pressure medium within the associated storage device.

[0004] The accumulator devices comprise a storage cylinder and a piston within it, which defines a storage volume for the pressure fluid. The pressure fluid can be pumped from the storage volume into a brake circuit as needed. If the storage volume decreases, the piston moves so deeply into the storage cylinder that it opens a spring-assisted, closed valve with an opening mechanism. Pressure fluid then flows back into the storage cylinder through the opened valve.

[0005] Conventionally used opening means are designed as a pin that is precisely inserted, or in particular pressed, into the accumulator piston. Precise manufacturing is necessary because the opening means must strike the valve sealing body with the correct degree to lift it. Typically, the pin-shaped opening means is guided from the piston side through the valve opening to the valve sealing body. This requires great precision in the part geometry and in the stroke movement of the accumulator piston. A precise part geometry can only be achieved with highly accurate and therefore expensive parts, manufacturing, and assembly. A precise stroke movement requires a complex design, including additional guide rings and a long guide length for the accumulator piston.

[0006] From DE 10 2011 089 956 A1, a storage chamber valve of a storage device is known, which is formed with a storage chamber and a storage piston guided therein, with a closing element for selectively opening and closing a passage on a valve seat and a tappet for selectively lifting the tappet from the valve seat, in which the tappet is held by an elastic holding element.

[0007] US Pat. No. 5,333,945 A discloses a brake pressure control system comprising an outlet valve with a closing element coupled to a closing element of an inlet valve by means of a clutch housing. The closing element of the inlet valve is connected to a rod coupled by means of a compression spring supported in the clutch housing. Disclosure of the invention

[0008] According to the invention, a valve of a storage device according to claim 1 is provided, which is formed with a storage cylinder and a storage piston guided therein. The valve is provided with a valve sealing body for selectively opening and closing a valve opening at a valve seat. Furthermore, the valve has an opening means for selectively lifting the valve sealing body from the valve seat, in which the opening means is held by a spring element. The spring element is formed with a stamped and bent part.

[0009] The spring element according to the invention deforms due to its resilient properties when a force is applied and returns to its original shape when the applied force is removed. The spring element holds the opening means precisely and robustly in position on the valve sealing body. Furthermore, it simultaneously provides the opening means with a defined range of motion, allowing it to be moved along with the piston when the piston moves and pushed against the valve sealing body. When moved in this way, the opening means lifts the valve sealing body from the valve seat by means of pressure contact, opening the valve.

[0010] According to the invention, the spring element is formed from a stamped and bent part that can be machine-produced particularly easily, cost-effectively, and in large quantities by stamping and bending a suitable material. A metal sheet, in particular spring steel, is preferably used as a suitable material, which is very robust and wear-resistant. Furthermore, functional elements or functional areas required during production in and / or on the spring element can be integrated into the stamped and bent part particularly easily and cost-effectively, preferably in a single step, by stamping and / or bending.

[0011] For assembly, the opening means with the associated punched and bent part can preferably simply be inserted into the storage device and clipped in or clipped on.

[0012] Furthermore, the stamped and bent part, together with the opening means, can be manufactured cost-effectively as a comparatively small precision part. Preferably, the opening means, together with the stamped and bent part, is also designed as a single part, which is advantageously prefabricated and held to the storage device with minimal effort by means of the spring element as a stamped and bent part in a force-fitting and / or form-fitting manner.

[0013] Overall, compared to conventional storage devices, lower precision requirements are required for the manufacturing of the opening device and its assembly on the storage device. This, in addition to the cost-effective production of the spring element as a stamped and bent part, also reduces the overall manufacturing effort and costs for the storage device.

[0014] Particularly preferably, the opening means is held on the storage cylinder or cylinder by the stamped and bent part. With such a mount, the opening means is held on the component against which the valve closing body also rests, at least indirectly, at its valve seat. Therefore, the relative position between these components is particularly precise. Furthermore, the opening means can be very easily mounted on the cylinder by simply clipping it into place.

[0015] Alternatively, the opening means is advantageously held to the accumulator piston or piston with the stamped and bent part. Simple clip assembly is also possible there. Furthermore, this refinement allows the use of a simple standard accumulator piston without requiring a particularly precise press fit for an opening means. Therefore, a comparatively simple piston geometry can be selected. Furthermore, the risk of chip wear or deformation due to pressing forces is almost completely eliminated.

[0016] Particularly precise positioning of the opening means held according to the invention is possible in that the associated punched and bent part is arranged directly on the component forming the valve seat, in particular a valve seat body. This punched and bent part, together with the opening means, can then also be dimensioned particularly small. A one-piece design of the punched and bent part together with the component forming the valve seat is advantageous. Furthermore, it is also advantageous to form the valve sealing body in one piece with the opening means and the punched and bent part. In this case, the high strength of spring steel can also be used for the valve seat and / or the valve sealing body. With such a "combination part", the surrounding pump housing can also be designed particularly small.

[0017] Preferably, the opening means is designed with a pin element for engaging, in particular for slightly eccentric engagement, with the valve sealing body. The pin element is formed with a pin punched from a base plane of the stamped and bent part and bent out of this base plane. Such a pin as an opening means can advantageously extend through the valve opening in order to then engage the valve sealing body on the one hand and be actuated by the accumulator piston on the other. The end of the pin facing the valve sealing body can be specially adapted for this purpose, in particular designed with an inclined contact surface, so that the surface of the valve sealing body is not deformed when the opening means strikes.

[0018] Furthermore, the end of the pin directed toward the valve sealing body is preferably designed with at least two engagement points, with which the pin engages the valve sealing body when the valve is opened. Having at least two engagement points stabilizes the direction of movement when engaging and pressing on the valve sealing body, particularly when the valve sealing body is a sphere. For the ball, two engagement points, together with a contact point or rolling point on an associated valve seat of a valve seat body, form at least three support points, so that the position of the sphere is clearly and stably defined.

[0019] In addition, the opening means preferably engages the valve sealing body slightly eccentrically, which facilitates the detachment and lifting of the valve sealing body from the valve seat. The valve sealing body is then lifted slightly asymmetrically, rapidly increasing the flow cross-section of the valve opening and allowing more fluid to flow through per unit of time.

[0020] Alternatively, the pin is manufactured as a single part and connected to the stamped and bent part as a spring element. Particularly preferably, the pin has a shoulder at its end facing the stamped and bent part, which can be fitted into a complementarily shaped recess in the stamped and bent part. Preferably, the pin is fitted particularly securely and permanently to the stamped and bent part, particularly by means of a press fit. In an alternative variant, the pin is advantageously detachably connected to the stamped and bent part, so that the pin, as a wearing part, can be easily replaced individually.

[0021] Furthermore, the pin is advantageously held by a radially directed arm. As a section of the stamped and bent part, the radially directed arm forms a resilient connection from the radial outside to the radial inside, with the pin positioned radially inside. With this connection, the pin is very simply held in the center of an otherwise circular-cylindrical cylinder-piston arrangement with a spring force determined by the arm. The valve opening can advantageously be arranged in the center, thereby achieving a symmetrical and largely laminar flow through the valve according to the invention.

[0022] Advantageously, the arm is further configured with two substantially radially extending, particularly parallel, partial arms punched from the base plane of the stamped and bent part. The partial arms are spaced apart from one another to form a passage for the brake fluid. During operation, the brake fluid flows through the passage, allowing brake fluid to be conveyed with minimal resistance. Furthermore, the spring force of each partial arm can be individually adjusted depending on operating requirements, particularly by varying the thickness and / or length of the individual partial arm. Advantageously, the partial arms have a lower overall spring force than a single, compact arm without a passage but with otherwise identical thickness and length dimensions, particularly due to the passage.The lower spring force creates less resistance of the spring element to displacement by the accumulator piston.

[0023] Furthermore, a particularly concave or convex bead is preferably formed at the transition from the arm to the pin, which stabilizes and / or stiffens the pin in a simple manner and without additional material. Forces occur particularly at the transition from the arm to the pin that would otherwise lead to wear.

[0024] For stabilization, the pin is additionally or alternatively preferably designed with at least one bevel punched from the base plane of the punched-bent part and bent out of this base plane. The bevel is thus formed on at least one outer edge of the pin and particularly preferably points radially toward the arm. This creates a particularly stable yet compact pin.

[0025] According to the invention, a valve is created in which the spring element is designed with an annular holding section. The annular holding section is formed with an annular disc punched out of an already mentioned base plane of the stamped and bent part, in which in particular at least one through-opening is punched out. By means of the annular disc as an annular holding section, the spring element can be very easily and precisely attached in place, in particular to the circular-cylindrical storage cylinder or storage piston. In addition, brake fluid can flow through the at least one through-opening punched out in the annular disc. This allows brake fluid to flow into and out of the storage device particularly easily and with little resistance, thus facilitating fluid exchange.

[0026] Furthermore, the spring element is advantageously designed with at least one axial spacer facing the storage cylinder. The axial spacer is formed with a tab punched from a previously described base plane of the punched and bent part and bent out of this base plane. This tab creates a distance between the storage cylinder and the spring element, allowing fluid to flow through it. Furthermore, the distance prevents the spring element from hydraulically sticking to the storage cylinder, which would otherwise occur. Preferably, additionally or alternatively, an axial spacer facing the storage piston is punched from the base plane of the punched and bent part and formed from this base plane as a tab bent out. The axial spacer formed in this way creates a distance between the spring element and the storage cylinder, and preferably simultaneously between the spring element and the storage piston.According to the invention, the spring element can thus be flowed around by brake fluid with particularly low resistance.

[0027] Preferably, the spring element is also designed with an axial bulge facing the accumulator piston. The axial bulge is formed by an arm punched from a base plane of the punched and bent part and bent out of this base plane. This bulge represents a spacer between the accumulator piston and the opening means. It enables particularly simple adaptation of the arrangement according to the invention to various types of accumulator cylinders and / or accumulator pistons. In particular, a simple, cost-effective standard accumulator piston can be used, which has a flat piston end face. When the accumulator piston is moved toward the spring element, this piston end face first presses against the arm bent out of the base plane of the punched and bent part, actuating the pin held thereby. In this way, a particularly short reaction time can be achieved.

[0028] The invention is further directed to the use of such a valve according to the invention in an accumulator device, in particular for a hydraulic unit of a vehicle brake system, in which, in particular, the accumulator piston is designed with an axial bulge facing the opening means. This design is particularly advantageous when the opening means is mounted with the spring element according to the invention on the accumulator cylinder or on the valve seat body.

[0029] Preferably, the piston end face facing the opening means, with its bulge, is designed at least approximately in the shape of a spherical segment. The center of the spherical segment is advantageously the point around which the accumulator piston can rotate or pivot slightly within the accumulator cylinder if it deviates from its theoretically linear movement. Such displacement of the accumulator piston within the accumulator cylinder then largely no longer has any effect on the actuation of the opening means.

[0030] In the following, exemplary embodiments of the inventive solution are explained in more detail with reference to the attached schematic drawings. It shows: Fig. 1 shows part of a hydraulic circuit diagram of a vehicle brake system with a storage device according to the prior art, Fig. 2 the detail II in Fig. 1, Fig. 3 a longitudinal section of a storage device according to Fig. 1, Fig. 4 a longitudinal section of a first variant of a storage device with a spring element according to the invention, Fig. 5 is a perspective view of a first embodiment of a spring element for a valve according to the invention, Fig. 6 a first side view of the spring element according to Fig. 5, Fig. 7 a plan view of the spring element according to Fig. 5, Fig. 8 an enlarged plan view of the spring element according to Fig. 5, Fig. 9 a second side view of the spring element according to Fig. 5, Fig. 10 the detail X in Fig. 4, Fig. 11 is a perspective view of a second embodiment of a spring element according to the invention, Fig. 12 the section XII according to Fig. 11, Fig. 13 is a perspective view of a third embodiment of a spring element for a valve according to the invention, Fig. 14 is a perspective view of a fourth embodiment of a spring element for a valve according to the invention, Fig. 15 the section XV according to Fig. 14, Fig. 16 is a perspective view of a fifth embodiment of a spring element according to the invention, Fig. 17 the section XVII according to Fig. 16, Fig. 18 the detail XVIII in Fig. 17 and Fig. 19 a longitudinal section of a second variant of a storage device with a spring element according to the invention.

[0031] In Fig. 1 illustrates a vehicle brake system 10 comprising a brake pedal 12 operable by a driver of an associated four-wheeled vehicle. The brake pedal 12 acts on a brake booster 14, by means of which pressure can be generated on a fluid in the form of brake fluid at an associated master brake cylinder 16. The master brake cylinder 16 is connected to various fluid lines 18, to which, in particular, a switching valve 20, a pump element 22 with an associated drive motor 24, an inlet valve 26 for the left rear, an inlet valve 28 for the right front, an outlet valve 30 for the left rear, an outlet valve 32 for the right front, as well as a brake cylinder 34 for the left rear and a brake cylinder 36 for the right front are optionally fluidically connected. Furthermore, a storage device 38 for temporarily storing brake fluid is connected to the fluid lines 18.

[0032] The storage device 38 is in Fig. 2 with a coarser and in Fig. 3 with a more detailed schematic diagram. The storage device 38 comprises a cup-shaped, circular-cylindrical storage cylinder 40 in which a storage piston 42 is movably mounted. The storage piston 42 is sealed fluid-tightly, yet movably, on the inside of the storage cylinder 40 by means of a piston seal 44 fixedly arranged on the storage piston 42. A piston spring 46 urges the thus movably mounted storage piston 42 into the cup shape of the storage cylinder 40, thereby forming a pressure chamber inside the cylinder for temporarily storing pressurized brake fluid.

[0033] On the bottom surface 47 of the cup-shaped storage cylinder 40, opposite the accumulator piston 42, a valve 48 is formed on the storage cylinder 40. This valve 48 can be used to selectively admit brake fluid into the interior of the storage cylinder 40. The valve 48 is actuated by the accumulator piston 42 when it moves far into the storage cylinder 40 and thus approaches the valve 48. For this purpose, the valve 48 is designed with a valve sealing body 50, which is urged toward the accumulator piston 42 against a valve seat 54 by a valve spring 52. The valve seat 54 is formed on a valve seat body 56 and surrounds a valve opening 58 there. The valve seat body 56 can be formed in one piece, in multiple parts with a valve seat and a valve seat carrier, or integrated as a mounting in the storage cylinder 40.

[0034] An opening means 60 in the form of a pin is formed on the accumulator piston 42, which is pressed into a press fit 62 on the accumulator piston 42 opposite the valve opening 58 and held there in place. The press fit 62 serves to position the pin-shaped opening means 60 very precisely relative to the valve sealing body 50 resting on the valve seat 54, particularly in the axial direction of the accumulator piston 42. Precise positioning is necessary so that the accumulator piston 42 lifts the valve sealing body 50 from the valve seat 54 at a precisely defined point as it moves into the accumulator piston 42, thus opening the valve 48.

[0035] In Fig. 4 illustrates a memory device 38 according to the invention, which largely comprises the elements already described in Fig. 3. Additionally, a filter 63 for filtering brake fluid flowing into the accumulator device 38 is mounted in the valve 48. Furthermore, no conventional opening means 60 in the form of a pin is arranged in a specially formed accumulator piston 42 by means of a press fit 62. Instead, a spring element 64 according to the invention is provided, which in this case is positioned between the accumulator piston 42 and the bottom surface 47 of the accumulator cylinder 40.

[0036] The spring element 64 according to the invention is shown in Fig. 5 to Fig. 18 shows various embodiments in detail. Common to all embodiments is that the spring element 64 is formed as a stamped and bent part, in this case made of spring steel, and has a base plane 65. In this base plane 65, an annular holding section 66 of the spring element 64 is formed by stamping an annular disc 67 out of the base plane 65. The annular holding section 66 serves to hold a radially directed arm 68, which in turn holds a pin 69. Both the arm 68 and the pin 69 are stamped out of the base plane 65 of the stamped and bent part and bent such that the pin 69 points upward (relative to the figure). Installed in the storage device 38, the pin 69 projects in the direction of the storage cylinder 40 and thus in the direction of the valve sealing body 50.The pin 69 forms an opening means 70 with which the valve sealing body 50 is pushed from the valve seat 54 when the accumulator piston 42 is moved into the accumulator cylinder 40 and the valve 48 is thus opened (. Fig. 4 and Fig. 19).

[0037] The arm 68 extends in its radially inward direction beyond the center of the annular disc 67, so that the pin 69 held by the arm 68 engages the valve sealing body 50 eccentrically through the valve opening 58 ( Fig. 4 and Fig. 19).

[0038] Furthermore, the arm 68 is bent toward the accumulator piston 42, so that an axial bulge 71 of the spring element 64 is formed in the direction of the accumulator piston 42. When the accumulator piston 42 moves toward the spring element 64, the accumulator piston 42 initially touches the axial bulge 71. The arm 68 and the associated pin 69 are immediately pressed toward the valve sealing body 50, and the valve 48 is opened particularly quickly.

[0039] In addition, the arm 68 is designed with two parallel partial arms 72, which are punched and bent from the base plane 65 and point radially inward in an approximately parallel manner. A through-opening 74 is formed between the partial arms 72, which attenuates the spring action of the spring element 64 and allows the brake fluid to flow through.

[0040] The flow of the brake fluid is further facilitated by at least one through-hole 76 punched out of the annular disc 67. In the present embodiments, there are five to six through-holes 76.

[0041] In addition, a total of six tabs are punched from the annular disc 67. Of the six tabs, three are bent from the base plane 65 in such a way that three axial spacers 78 facing the bottom surface 47 of the accumulator cylinder 40 are formed. The other three tabs are bent in the opposite direction and thus form three axial spacers 80 facing the accumulator piston 42. The spacing created by the spacers 78 and 80 also enables particularly easy and resistance-free flow of the brake fluid. Furthermore, the hydraulic sticking of a conventional spring element or holder for an opening pin to the accumulator cylinder 40 and / or the accumulator piston 42, which would otherwise occur, is avoided.

[0042] In Fig. 5 to Fig. 10 shows a first embodiment of a spring element 64 according to the invention in detail in various views. The pin 69 has a two-part shape with two engagement rods 82. With these two engagement rods 82, the pin 69 engages securely and without twisting on a ball as the valve sealing body 50. The single engagement rod 82 has an inclined, in particular rounded, contact surface 84, which contacts the valve sealing body 50 when the valve 48 opens ( Fig. 10).

[0043] Fig. 11 and Fig. 12 shows an embodiment in which a convex bead 86 is formed at a transition 85 from the arm 68 to the pin 69, i.e., at a pin bend, and between the two engagement rods 82. The bead 86 stabilizes the transition 85 and simultaneously the pin 69.

[0044] The pin 69 is in a further embodiment according to Fig. 13 is additionally stabilized with two bevels 88, which extend axially along a respective outer edge of the pin 69 and point radially in the direction of the arm 68. This advantageously forms a particularly stable and at the same time compact pin 69.

[0045] Fig. 14 and Fig. 15 illustrate an embodiment in which a concave bead 90, viewed in the direction of the radial arm 68, is formed at the transition 85. The concave bead 90 is thus located on the outside of the pin bend, i.e., on a rounded portion of the pin 69, which was created during the bending of that punched-out section of the annular disk 67 intended for the arm 68 and the pin 69. With the concave bead 90, the pin 69 is firstly stabilized and secondly shaped in such a way that two points of engagement for the valve sealing body 50 are created. Two engagement rods 82 do not need to be formed specifically here, as in the embodiments according to Fig. 5 to Fig. 13 are described.

[0046] In a further embodiment according to Fig. 16 to Fig. 18, the pin 69 is formed as a separate pin with two engagement rods 82, each forming an inclined contact surface 84. This pin 69 also has a shoulder 92, with which the pin 69 is press-fitted into a complementary recess 94 provided in the stamped and bent part. Alternatively, the pin 69 can be connected to the spring element 64 by soldering, welding, and / or pin deformation.

[0047] The pin 69 protrudes, as in the Fig. 4 and Fig. 19, through the associated valve opening 58 and ends with the usually obliquely oriented contact surface 84, which is intended to abut against the associated valve sealing body 50. The positioning of the opening means 70 thus corresponds to that of the opening means 60 according to the prior art. At the same time, however, the opening means 70 is not rigidly arranged on another body of the storage device 38, but rather resiliently. In this way, it can be arranged, in particular, resiliently directly or indirectly on the storage cylinder 40, thereby enabling simple and at the same time precise positioning relative to the valve sealing body 50.

[0048] According to Fig. 4 shows an embodiment in which the spring element 64 with its holding section 66 is clipped onto the inside of the storage cylinder 40 and is thus fixed there.

[0049] In an alternative embodiment not shown, the spring element 64 with its annular holding section 66 is held on a correspondingly shaped valve seat body 56 and thus in the immediate vicinity of the valve seat 54.

[0050] The opening means 70, which is thus resiliently held on the storage cylinder 40 or on the valve seat body 56, is moved by means of the storage piston 42 against the valve sealing body 50 in order to be able to lift the latter from the valve seat 54 as already explained above. For this purpose, a bulge 98 is formed centrally on a piston end face 96 facing the spring element 64, with which the storage piston 42 abuts the spring element 64 during its movement into the storage cylinder 40. The bulge 98 is in the embodiment according to Fig. 4 in the form of an obliquely stepped elevation of a simple accumulator piston 42. In a Fig.In the variant shown in Figure 19, the bulge 98 is designed in the form of a spherical segment and has a radius 100 selected such that, upon slight pivoting or a non-linear movement within the storage cylinder 40, the accumulator piston 42 pivots about the center point 102 from which the radius 100 originates. Regardless of the non-linear movement of the accumulator piston 42, the opening means 70 is thus always reliably forced toward the valve sealing body 50.

Claims

[1] Valve (48) of a storage device (38) which is formed with a storage cylinder (40) and a storage piston (42) guided therein, with a valve sealing body (50) for selectively opening and closing a valve opening (58) on a valve seat (54) and an opening means (70) for selectively lifting the valve sealing body (50) from the valve seat (54), in which the opening means (70) is held by a spring element (64), characterized by that the spring element (64) is formed with a punched and bent part and the spring element (64) is designed with an annular holding section (66) which is formed with an annular disc (67) punched out of a base plane (65) of the punched and bent part. [2] Valve (48) according to claim 1, in which the opening means (70) is designed with a pin element for engaging the valve sealing body (50), wherein the pin element is formed with a pin (69) punched from the base plane (65) of the punched-bent part and bent out of this base plane (65). [3] Valve (48) according to claim 2, wherein the pin (69) is held by a radially directed arm (68). [4] Valve (48) according to claim 3, wherein the arm (68) is designed with two substantially radially extending partial arms (72) punched from the base plane (65) of the punched-bent part. [5] Valve (48) according to claim 4, wherein the two partial arms (72) are designed to extend substantially radially in parallel. [6] Valve (48) according to one of claims 3 to 5, in which a concave bead (90) or convex bead (86) is formed at the transition (85) from the arm (68) to the pin (69). [7] Valve (48) according to one of claims 2 to 6, wherein the pin (69) is designed with at least one bevel (88) punched from the base plane (65) of the punched-bent part and bent out of this base plane (65). [8] Valve (48) according to one of claims 1 to 7, in which at least one through-opening (76) is punched out in the annular disc (67). [9] Valve (48) according to one of claims 1 to 8, in which the spring element (64) is designed with at least one axial spacer (78) facing the storage cylinder (40), wherein the axial spacer (78) is formed with a tab punched from the base plane (65) of the punched-bent part and bent out of this base plane (65). [10] Valve (48) according to one of claims 1 to 9, in which the spring element (64) is designed with an axial bulge (71) facing the accumulator piston (42), wherein the axial bulge (71) is formed by an arm (68) punched out of the base plane (65) of the punched-bent part and bent out of this base plane (65). [11] Use of a valve (48) according to one of claims 1 to 10 in a storage device (38), in which in particular the storage piston (42) is designed with an axial bulge (98) facing the opening means (70). [12] Use of a valve (48) according to claim 11, wherein the storage device (38) is used for a hydraulic unit of a vehicle brake system (10).

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