storage chamber valve

Abstract

Accumulator chamber valve with an accumulator chamber (3) and an accumulator piston (10) movably guided in the accumulator chamber (3) and a passage (7) via which the accumulator chamber (3) is connected to a fluid supply, wherein a closing element (16) in a closed position seals a valve seat (9) arranged on the edge of the passage (7), wherein an opening element (20, 20', 20'') passes through the passage (7) and is movable by the accumulator piston (10), which generates an actuating force (F2) at an actuating region (26, 26', 26'') of the opening element (20, 20', 20''), wherein a stroke of the accumulator piston (10) via the opening element (20, 20', 20'') causes an opening stroke of the closing element (16), wherein the opening element (20, 20', 20'') is at a contact region (28, 28', 28'') acts on the closing element (16) and presses the closing element (16) against a closing force (F1) out of the valve seat (9), wherein the opening element (20, 20',20'') is designed as an angle element with a first leg (22, 22', 22'') and a second leg (24, 24', 24''), wherein one end of the first leg (22, 22', 22'') is rotatably mounted at a pivot point (30) and one end of the second leg (24, 24', 24'') transmits at least a portion of the actuating force (F2) at the contact area (28, 28', 28'') to the closing element (16), wherein the actuating area (26, 26', 26'') is arranged at a transition area between the first leg (22, 22', 22'') and the second leg (24, 24', 24'') in such a way that axes of action of the actuating force (F2) at the actuating area (26, 26', 26'') can be predetermined with respect to the pivot point (30) and to an axis of action of the closing force (F1) at the contact area (28, 28', 28''),and the axis of action of the actuating force (F2) at the actuating area (26) corresponds to the axis of action of the closing force (F1) at the contact area (28) and specifies the ratio between the axial stroke of the accumulator piston (10) and the axial opening stroke of the closing element (16) with a value of 1, or the axis of action of the closing force (F1) at the contact area (28'') runs between the pivot point (30) and the axis of action of the actuating force (F2) at the actuating area (26'') and specifies the ratio between the axial stroke of the accumulator piston (10) and the axial opening stroke of the closing element (16) with a value range greater than 1.,

Description

Prior ArtThe invention relates to a storage chamber valve.Storage chamber valves are known from the prior art, in which a closing element or sealing body of a spring-assisted closed valve is moved from a valve seat or sealing seat into an open position by a pin connected to a storage chamber piston as soon as the storage chamber volume falls below a threshold value, i.e. the storage chamber piston approaches a stop arranged in the region of the sealing seat. Such storage chamber valves can be used, for example, in a hydraulic brake system of a motor vehicle which has an ABS and / or ESP functionality (ABS: anti-lock brake system, ESP: electronic stability program).In order to close the valve seat during a basic braking or partial braking with the closing element, the driver actuates the brake pedal. As a result, a piston of a master brake cylinder is displaced, as a result of which a fluid volume is displaced into the brake line. In the ESP unit with such an accumulator chamber valve, the accumulator piston is pressed downward, and the accumulator chamber valve goes from a normal open position into a closed position.For example, U.S. Pat. No. 7,543,896 B2 discloses a hydraulically controlled accumulator chamber valve in which a spring-biased ball seat valve is opened by means of a tappet in the accumulator piston. This takes place at a force ratio specified for the system between spring prestressing force and hydraulically effective force. The ball poppet valve is actuated via a cylindrical metallic tappet which is pressed into the accumulator piston. The accumulator piston also receives a sealing ring and a guide ring. Between the storage piston and the closure cover, which is connected to the pump housing via a retaining caulking, there is a correspondingly prestressed compression spring. The spring force acts against the hydraulically effective force on the accumulator piston and, in the event of an excess of the spring force, causes a displacement of the accumulator piston-plunger combination in the opening direction of the accumulator chamber valve. Due to the fixed coupling of the plunger with the storage piston, the transmission ratio between the axial storage piston stroke and the axial opening stroke of the closing element is constant over the storage piston stroke.The published patent application DE 42 02 388 A1 describes, for example, a hydraulic brake system for a motor vehicle. The described brake system comprises a hydraulically controlled accumulator chamber valve having a closing element which is prestressed via a first compression spring and seals a valve seat in a valve body, and a plunger which is connected to an accumulator piston acted upon by a second compression spring and presses the closing element out of the valve seat when a specified force ratio is present between the spring prestressing forces and a hydraulically effective force. In these constructions of storage chamber valves, the sealing body of the spring-assisted closed valve is moved into the open position by a pin connected to the storage piston as soon as the storage chamber volume falls below a threshold value, i.e. the storage piston approaches the stop. Due to the fixed coupling of the plunger with the storage piston, the transmission ratio between the axial storage piston stroke and the axial opening stroke of the closing element is constant over the storage piston stroke.From the post-published DE 10 2012 218 544 A1 of the applicant, a storage chamber valve is known, having a storage chamber and a storage piston movably guided in the storage chamber and a passage, via which the storage chamber is connected to a fluid supply. In a closed position, a closing element seals a valve seat arranged on the edge of the feedthrough. An opening element passes through the passage and is movable by the accumulator piston, which generates an actuating force at an actuating region of the opening element. A stroke of the storage piston brings about an opening stroke of the closing element via the opening element, wherein the opening element acts on the closing element at a contact region and presses the closing element out of the valve seat against a closing force. The opening element is designed as an angle element with a first leg and a second leg. One end of the first leg is rotatably mounted at a pivot point and one end of the second leg transmits at least a portion of the actuating force at the contact region to the closing element. The actuation region is arranged at a transition region between the first leg and the second leg such that an axis of action of the actuation force at the actuation region runs between the pivot point and the axis of action of the closing force at the contact region and specifies the transmission between the axial stroke of the storage piston and the axial opening stroke of the closing element with a value range of less than 1.Disclosure of the InventionThe storage chamber valve according to the invention having the features of independent claim 1 has the advantage over the related art that a simple, cost-effective and durable operative connection can be implemented between the storage piston and the closing element of the storage chamber valve.The core of the invention is the design of the opening element as a rotatably mounted and thus movable angle element, by means of which a desired transmission ratio between an accumulator piston stroke and a stroke of the opening element or of the closing element can be set.Embodiments of the present invention enable that no actuating force - other than frictional force in the bearing - is required for moving the opening element and thereby has a high operational strength. Another advantage of the invention is that a standard accumulator piston can be used. This makes it possible to eliminate the outlay and costs for a special piston, such as a special piston with attached, one-part or multi-part opening element, and / or special measures, such as guide rings, guide length, seal, etc., for particularly precise linear movement of the storage piston, with the purpose that the attached opening element strikes the valve body passage securely and in a robust manner via tolerance and operating positions. To facilitate the fluid exchange, bores, cut-outs, recesses can be provided in the opening element. The rotary bearing arrangement advantageously guides the opening element with true angles, so that a closing element guidance-also attached with true angles-can be readily ensured.Embodiments of the present invention provide an accumulator chamber valve which comprises an accumulator chamber and an accumulator piston which is guided movably in the accumulator chamber and a passage via which the accumulator chamber is connected to a fluid feed line. In a closed position, a closing element seals a valve seat arranged on the edge of the feedthrough. In this case, an opening element passes through the passage and is movable by the accumulator piston, which generates an actuating force at an actuating region of the opening element. A stroke of the storage piston brings about an opening stroke of the closing element via the opening element, wherein the opening element acts on the closing element at a contact region and presses the closing element out of the valve seat against an effective closing force. In this case, the opening element is designed as an angle element with a first leg and a second leg. In this case, one end of the first limb is rotatably mounted at a pivot point and one end of the second limb transmits at least a portion of the actuating force at the contact region to the closing element. The actuation region is arranged at a transition region between the first leg and the second leg in such a way that axes of action of the actuation force at the actuation region with respect to the pivot point and to an axis of action of the closing force at the contact region can be predefined. This advantageously makes it possible to set a transmission ratio between the stroke of the storage piston and the opening stroke of the closing element.The axis of action of the actuating force at the actuating region corresponds to the axis of action of the closing force at the contact region, so that the transmission ratio between the axial stroke of the storage piston and the axial opening stroke of the closing element is predefined with a value of 1. Alternatively, the axis of action of the closing force extends at the contact region between the pivot point and the axis of action of the actuating force at the actuating region, and the transmission between the axial stroke of the storage piston and the axial opening stroke of the closing element is specified with a value range greater than 1. This means that the effective axes of the actuating force and the closing force can be arranged offset to one another exactly on a common axis or to achieve a force transmission or a stroke transmission depending on the intended application. If the effective axis of the closing force through the closing element lies between the pivot point and the effective axis of the actuating force of the accumulator piston, a transmission ratio is realized in a value range greater than 1, so that the accumulator piston stroke is greater than the closing element stroke. As a result, the required effective actuating force at the actuating region of the opening element for moving the closing element is additionally smaller than the effective closing force at the contact region of the closing element.The measures and developments specified in the dependent claims make advantageous improvements of the storage chamber valve specified in independent patent claim 1 possible.In an advantageous embodiment of the storage chamber valve according to the invention, the open end of the second limb can form at least one point of contact with the closing element in the contact region. Thus, in an embodiment of the closing element as a closing ball, the second leg can form, for example, two contact points with respect to the closing element. This advantageously results in three contact points for the closing ball together with a rolling point of the closing ball in the valve body during the opening process, so that the position of the closing ball is determined unambiguously and stably.In a further advantageous embodiment of the storage chamber valve according to the invention, the rotational movement of the opening element away from the closing element can be limited by a stop. Limiting the rotational movement is important for assembly when the accumulator piston is not yet mounted and for large strokes of the accumulator piston. In these cases, the accumulator piston can temporarily lift off the opening element. Without a stop, the opening element would then fold over downward, so that the storage piston would not be mountable or could not move back into the upper position.In a further advantageous embodiment of the storage chamber valve according to the invention, the pivot point of the opening element can be arranged in a fixed position with respect to the valve seat. The pivot point of the opening element can be rotatably fastened and / or clipped and / or inserted, for example, on a valve body or on a fluid block.In a further advantageous embodiment of the storage chamber valve according to the invention, a first dimension of a cross-sectional area of the opening element, which runs in the actuation direction, can be made smaller than a second dimension of the cross-sectional area of the opening element, which runs perpendicular to the actuation direction. As a result, the opening element is made softer with respect to a deflection which is caused by applied forces and by the bearing force. Alternatively, the first dimension of the cross-sectional area of the opening element, which runs in the actuation direction, can be made larger than the second dimension of the cross-sectional area of the opening element, which runs perpendicular to the actuation direction. As a result, the opening element is made more rigid with respect to the deflection which is caused by applied forces and by the bearing force. In addition, the opening element in this cross-sectional embodiment advantageously has a lower flow resistance. A smaller bearing surface on the pivot bearing can be considered disadvantageous for this purpose.Exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. In the drawings, like reference numerals designate components or elements that perform like or analogous functions.Brief Description of the DrawingsFIG. 1 shows a schematic sectional illustration of the parts essential to the invention of a first exemplary embodiment of a hydraulic accumulator chamber valve according to the invention in a closed position. FIG. 2 shows a schematic sectional illustration of the parts essential to the invention of a second exemplary embodiment of a hydraulic storage chamber valve in a closed position. FIG. 3 shows a schematic sectional illustration of the parts essential to the invention of a third exemplary embodiment of a hydraulic accumulator chamber valve according to the invention in a closed position. FIG. 4 shows a schematic sectional illustration of a first exemplary embodiment of an opening element of the hydraulic accumulator chamber valve according to the invention from FIG. 1. FIG. 5 shows a schematic sectional illustration of a second exemplary embodiment of an opening element of the hydraulic accumulator chamber valve according to the invention from FIG. 1.Embodiments of the InventionFIGS. 1 to 3 show exemplary embodiments of an accumulator chamber valve 1, 1', 1" according to the invention, which is hydraulically controlled by way of example and is arranged in a stepped receiving bore, not shown in more detail, of a fluid block or pump housing.As can be further seen from FIGS. 1 to 3, the illustrated exemplary embodiments of the storage chamber valve 1, 1', 1" each comprise a storage chamber 3 and a storage piston 10 guided movably in the storage chamber 3 and a passage 7, via which the storage chamber 3 is connected to a fluid supply that is not visible. Between the storage chamber 3, which is connected to a fluid discharge that is not visible, and the fluid supply, a valve assembly is arranged, which comprises a valve body 5 and a closing element 16, which is embodied as a ball, for example. The closing element 16, which is prestressed by a first compression spring, which is not visible, seals a valve seat 9 in the valve body 5 in the closed position shown, which valve seat is arranged on the edge of the passage 7 facing away from the storage chamber 3. An opening element 20, 20', 20" reaches through the passage 7 in the valve body 5 and is moved by the accumulator piston 10, 10', 10", which generates an actuating force F2 at an actuating region 26, 26', 26" of the opening element 20, 20', 20". An axial stroke of the storage piston 10 here brings about an axial opening stroke of the closing element 16 via the opening element 20, 20', 20", wherein the opening element 20, 20', 20" acts on the closing element 16 at a contact region 28, 28', 28", and presses the closing element 16 out of the valve seat 9 against a closing force F1acting on the contact region 28, 28', 28", and moves it from a closed position to an open position when the volume in the storage chamber 3 falls below a predefined threshold value.In this case, the opening element 20, 20', 20" is designed as an angle element with a first leg 22, 22', 22" and a second leg 24, 24', 24", wherein one end of the first leg 22, 22', 22" is rotatably mounted on a pivot point 30 and one end of the second leg 24, 24', 24" transmits at least a portion of the actuating force F2 to the closing element 16 at the contact region 28, 28', 28". The actuation region 26, 26', 26" is arranged at a transition region between the first limb 22, 22', 22'' and the second limb 24, 24', 24'' in such a way that axes of action of the actuation force F2 at the actuation region 26, 26', 26'' with respect to the pivot point 30 and on an axis of action of the closing force F1 at the contact region 28, 28', 28'' can be predefined. As a result, a transmission ratio between the stroke of the storage piston 10 and the opening stroke of the closing element 16 can be adjusted in an advantageous manner.In the following description, the axial opening stroke of the closing element 16 corresponds to the axial stroke of the opening element 20, 20', 20" or the axial stroke of the second limb 24, 24', 24" of the opening element 20, 20', 20", since the opening element 20, 20', 20" is not embodied in one piece with the accumulator piston 10, 10', 10".As can be further seen from FIGS. 1 to 3, the rotatable mounting of the opening element 20, 20', 20" takes place at a pivot point 30 which is fixed in relation to the valve seat 9, and as a result the opening element 20, 20', 20" is fastened rotatably on the valve body 5 in the region of the passage 7 and bears against the end face 12 of the accumulator piston 10 during the opening movement via the actuating region 26, 26', 26" arranged at the lower end of the second limb 24, 24', 24". The two-part embodiment of the opening element 20, 20', 20" and of the accumulator piston 10 advantageously presets the transmission between the stroke of the accumulator piston 10 and the stroke of the opening element 20, 20', 20" or the opening stroke of the closing element 16 which is dependent on the position of the line of action of the actuating force F2, and enables the lowering of the precision requirements for the production, assembly and construction of the hydraulically controlled accumulator chamber valve 1, so that outlay and production costs can be reduced and the functional robustness can be increased. By the contact with the storage piston 10, the desired opening effect is exerted on the closing element 16 via the opening element 20, 20', 20". The opening element 20, 20', 20" can be held with its defined shape in the passage 7 and guided such that the second leg 24, 24', 24" substantially performs an axial movement.In order to close the valve seat 9 during a basic braking or partial braking with the closing element 16, the driver actuates the brake pedal. As a result, a piston, not shown, of a master brake cylinder, not shown, is displaced, as a result of which a fluid volume is displaced into the brake line. As a result, in an accumulator chamber valve 1, 1', 1" according to the invention, which is connected to the master brake cylinder via the fluid supply, which is not visible, the accumulator piston 10 is pressed downward, and the accumulator chamber valve 1, 1', 1" changes from the open position into the closed position shown.As can be further seen from FIGS. 1 to 3, the illustrated exemplary embodiments of the invention achieve a movement of the closing element 16 from the closed position into the open position in that the accumulator piston 10 generates the actuating force F2 with its end face 12 on the actuating region 26, 26', 26" of the opening element 20, 20', 20". The actuating region 26, 26', 26" is predetermined by the shape and dimensions of the opening element 20, 20', 20" and / or the shape and dimensions of the end face 12 of the accumulator piston 10. Preferably, a standard piston 10 is used, which has a curved region 14 or a curvature on the end face 12 and can be produced in large numbers.In the exemplary embodiments shown, the open end of the second limb 24, 24', 24" forms a point of contact with the closing element 16 in the contact region 28, 28', 28". In an embodiment of the opening element 20, 20', 20", which is not shown, the second leg 24, 24', 24", in an embodiment of the closing element 16 as a closing ball, forms, for example, two points of contact with the closing element 16. This advantageously results in three contact points for the closing ball 16 together with a rolling point of the closing ball 16 in the valve body 5 during the opening process, so that the position of the closing ball is determined unambiguously and stably during the opening process. In addition, the contact region 28, 28', 28" on the closing element 16 and thus the line of action of the closing force F1 and the line of action of the portion of the actuating force F2 acting on the contact region 28, 28', 28" are arranged eccentrically with respect to the central vertical axis of the closing element 16 in the exemplary embodiments shown. Alternatively, the contact region 28, 28', 28" can be arranged on the closing element 16 in such a way that the line of action of the closing force F1 and the line of action of the effective portion of the actuating force F2 lie exactly on the central vertical axis of the closing element 16.Furthermore, the rotational movement of the opening element 20, 20', 20" away from the closing element 16 is limited by a stop 5.1. Limiting the rotational movement facilitates the assembly of the accumulator piston 10 and enables large strokes of the accumulator piston 10. Without stop 5.1, opening element 20, 20', 20" would then fold downward, so that storage piston 10 would not be mountable or could not move back into the upper position. In the exemplary embodiments shown, the stop 5.1 is arranged on the valve body 5 in the region of the pivot point 30. Of course, the stop 5.1 can alternatively also be suitably mounted at other suitable locations than the one shown.As can be further seen from FIG. 1, the axis of action of the actuating force F 2 at the actuating region 26 corresponds in the illustrated first exemplary embodiment to the axis of action of the closing force F 1 at the contact region 28, and the transmission between the axial stroke of the storage piston 10 and the axial opening stroke of the closing element 16 is predefined with a value of 1. This means that, for moving the closing element, the value of the actuating force F 1 generated at the actuating region 26 and thus the effective portion of the actuating force F 2 at the contact region 28 corresponds in the first exemplary embodiment to the value of the effective closing force F 1 at the contact region 28. In addition, the axial stroke of the accumulator piston 10 corresponds to the axial opening stroke of the closing element 16.As can be further seen from FIG. 2, the axis of action of the actuating force F2 at the actuating region 26' in the second exemplary embodiment shown runs between the pivot point 30 and the axis of action of the closing force F1 at the contact region 28', and the transmission between the axial stroke of the storage piston 10 and the axial opening stroke of the closing element 16 is predefined with a value range of less than 1. This means that the stroke of the storage piston 10 is smaller than the stroke of the closing element 16 or the required effective actuating force F2 at the actuating region 26' of the opening element 20' for moving the closing element 16 is greater than the effective closing force F1 at the contact region 28' of the closing element 16.As can be further seen from FIG. 3, the axis of action of the closing force F1 at the contact region 28" in the third exemplary embodiment shown runs between the pivot point 30 and the axis of action of the actuating force F2 at the actuating region 26", and the transmission between the axial stroke of the storage piston 10 and the axial opening stroke of the closing element 16 is predefined with a value range greater than 1. This means that the stroke of the storage piston 10 is greater than the stroke of the closing element 16 or the required effective actuating force F2 at the actuating region 26" of the opening element 20" for moving the closing element 16 is smaller than the effective closing force F1 at the contact region 28" of the closing element 16.By a corresponding selection of the position of the axis of action of the actuating force F2 at the actuating region 26, 26', 26'', it is possible to easily provide different variants of the hydraulically controlled accumulator chamber valve 1, 1', 1'' according to the invention, which can be optimally adapted to the respective field of application. Thus, the transmission between the axial stroke of the storage piston and the axial opening stroke of the closing element can be preset with a value of 1 or with a value from the value range smaller than 1 or with a value from the value range larger than 1, depending on the application.As can be seen from FIG. 4, in the illustrated first exemplary embodiment of the opening element 20, a first dimension h of a cross-sectional area A of the opening element 20 which runs in the actuation direction illustrated by arrows is embodied smaller than a second dimension b of the cross-sectional area A of the opening element 20 which runs perpendicular to the actuation direction. As a result, the opening element 16 is made softer with respect to a deflection generated by applied forces F 1, F 2 and the bearing force at the pivot point 30.As can be seen from FIG. 5, in the illustrated second exemplary embodiment of the opening element 20, the first dimension h of the cross-sectional area A of the opening element 16, in contrast to the first exemplary embodiment illustrated in FIG. 4, is embodied to be greater than the second dimension b of the cross-sectional area A of the opening element 20. As a result, the opening element 20 is designed more rigid with respect to a deflection generated by applied forces F 1, F 2 and the bearing force at the pivot point 30. In addition, the opening element 20 in this cross-sectional embodiment advantageously has a lower flow resistance. However, the bearing surface at the pivot point 30 is smaller for this purpose.

Claims

Storage chamber valve having a storage chamber (3) and a storage piston (10) guided movably in the storage chamber (3) and a passage (7) via which the storage chamber (3) is connected to a fluid feed, wherein a closing element (16), in a closed position, seals a valve seat (9) arranged at the edge of the passage (7), wherein an opening element (20, 20', 20") reaches through the passage (7) and is movable by the storage piston (10), which generates an actuating force (F2) at an actuating region (26, 26', 26") of the opening element (20, 20', 20"), wherein a stroke of the storage piston (10), via the opening element (20, 20', 20"), brings about an opening stroke of the closing element (16), wherein the opening element (20, 20', 20"), 20") acts on the closing element (16) at a contact region (28, 28', 28") and presses the closing element (16) out of the valve seat (9) against a closing force (F1), wherein the opening element (20, 20', 20") is designed as an angle element with a first leg (22, 22', 22") and a second leg (24, 24', 24"), wherein one end of the first leg (22, 22', 22") is rotatably mounted at a pivot point (30) and one end of the second leg (24, 24', 24") transmits at least a portion of the actuating force (F2) at the contact region (28, 28', 28") to the closing element (16), wherein the actuating region (26, 26', 26") is arranged at a transition region between the first limb (22, 22', 22") and the second limb (24, 24', 24") such that axes of action of the actuating force (F2) at the actuating region (26, 26', 26") can be predefined with respect to the pivot point (30) and with respect to an axis of action of the closing force (F1) at the contact region (28, 28', 28"), and the axis of action of the actuating force (F2) at the actuating region (26) corresponds to the axis of action of the closing force (F1) at the contact region (28) and specifies the transmission between the axial stroke of the storage piston (10) and the axial opening stroke of the closing element (16) with a value of 1, or the axis of action of the closing force (F1) at the contact region (28") between the pivot point (30) and the axis of action of the actuating force (F2) at the actuating region (26") extends and specifies the transmission between the axial stroke of the storage piston (10) and the axial opening stroke of the closing element (16) with a value range greater than 1.Storage chamber valve according to Claim 1, characterized in that the open end of the second limb (24, 24', 24") forms at least one point of contact with the closing element (16) in the contact region (28, 28', 28").Storage chamber valve according to Claim 1 or 2, characterized in that the rotational movement of the opening element (20, 20', 20") away from the closing element (16) is limited by a stop (5.1).Storage chamber valve according to one of Claims 1 to 3, characterized in that the pivot point (30) of the opening element (20, 20', 20") is arranged in a fixed manner with respect to the valve seat (9).Storage chamber valve according to Claim 4, characterized in that the pivot point (30) of the opening element (20, 20', 20") is arranged on a valve body (5) or on a fluid block.Storage chamber valve according to one of Claims 1 to 5, characterized in that a first dimension (h) of a cross-sectional area (A) of the opening element (20, 20', 20") which runs in the actuating direction is smaller than a second dimension (b) of the cross-sectional area (A) of the opening element (20, 20', 20") which runs perpendicular to the actuating direction.Storage chamber valve according to one of Claims 1 to 6, characterized in that the first dimension (h) of the cross-sectional area (A) of the opening element (20, 20', 20") which runs in the actuating direction is greater than the second dimension (b) of the cross-sectional area (A) of the opening element (20, 20', 20") which runs perpendicular to the actuating direction.

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