EP3252318B1 - Hydraulischer akkumulator - Google Patents

Hydraulischer akkumulator Download PDF

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Publication number
EP3252318B1
EP3252318B1 EP16172377.0A EP16172377A EP3252318B1 EP 3252318 B1 EP3252318 B1 EP 3252318B1 EP 16172377 A EP16172377 A EP 16172377A EP 3252318 B1 EP3252318 B1 EP 3252318B1
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EP
European Patent Office
Prior art keywords
body portion
pressure
cylindrical body
hydraulic
bellows
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16172377.0A
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English (en)
French (fr)
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EP3252318A1 (de
Inventor
Hiroshi Mizukami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to EP16172377.0A priority Critical patent/EP3252318B1/de
Priority to ES16172377T priority patent/ES2737727T3/es
Publication of EP3252318A1 publication Critical patent/EP3252318A1/de
Application granted granted Critical
Publication of EP3252318B1 publication Critical patent/EP3252318B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/083—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor the accumulator having a fusible plug
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows

Definitions

  • the invention relates to a hydraulic accumulator, and particularly relates to a hydraulic accumulator including a self-seal stay with a weakened portion.
  • An automobile's brake circuit or the like has a hydraulic circuit, which employs a hydraulic accumulator for temporarily storing fluid increased in pressure.
  • the hydraulic accumulator includes a gas chamber in which a gas of a high pressure is sealed, and a fluid chamber in which a hydraulic fluid (hydraulic oil) is introduced.
  • the gas chamber and the fluid chamber are arranged opposite to each other relative to an expandable and contractible bellows. Expanding and contracting of the bellows makes the pressure of the gas chamber and the pressure of the fluid chamber balance with each other, which prevents pulsation of the hydraulic circuit to regulate it to an appropriate hydraulic pressure.
  • the patent document 1 describes a hydraulic accumulator provided with a weakened portion which serves as a relief means for releasing inner pressure of the gas chamber and is formed by reducing a thickness of the sidewall of the stay disposed in the fluid chamber (refer to paragraph [0017] and FIG. 1 ).
  • a hydraulic accumulator provided with a weakened portion which serves as a relief means for releasing inner pressure of the gas chamber and is formed by reducing a thickness of the sidewall of the stay disposed in the fluid chamber (refer to paragraph [0017] and FIG. 1 ).
  • breaking the weakened portion makes hydraulic fluid of a high pressure discharged from the fluid chamber to decrease the pressure in the fluid chamber.
  • the excessively increased inner pressure of the gas chamber causes the bellows to be intentionally broken to release the inner pressure of the gas chamber from the communication hole formed in the head portion of the stay.
  • the patent document 2 describes a hydraulic accumulator formed with a shapedly weakened portion, which serves as a relief means for releasing then inner pressure of the gas chamber and is simultaneously formed during press forming of the metal-made stay.
  • This shapedly weakened portion causes the metal-made stay to be buckled to further securely release liquid and gas in the shell (refer to claims 1 and 2, paragraph [0009], and FIGS. 2 to 8 ).
  • the first object of the invention is to reduce the number of steps for fabricating a hydraulic accumulator with a simple construction.
  • the second object of the invention is to facilitate regulating a relief pressure for releasing pressure in a gas chamber.
  • the third object of the invention is to release a high pressure gas in a gas chamber at a proper timing.
  • the fourth object of the invention is to properly control a relief pressure of the high-pressure gas.
  • the hydraulic accumulator includes a shell including an internal portion defining a gas chamber and a fluid chamber; a bellows expandably and contractibly housed in the shell and partitioning the internal portion into the gas chamber and the fluid chamber; a port portion disposed on the shell and defining a hydraulic-fluid inlet open to the fluid chamber; and a self-seal stay disposed at the port portion and including a cylindrical body portion and a lid-shaped head portion defining a through hole.
  • the head portion is one with which an end portion of the bellows comes into contact.
  • the self-seal stay includes a first weakened portion for deforming the body portion to incline the head portion relative to the end portion of the bellows when a pressure of the gas chamber is more than a given threshold.
  • the first weakened portion including a first recessed portion formed in a circumferential direction of the body portion.
  • the first recessed portion includes a bottom surface of a plane surface or a circular arc shaped curved surface which is convex toward outside of the body portion from inside thereof. At least one of both end portions of the bottom surface in the circumferential direction is joined with an outer circumferential surface of the body portion.
  • the first recessed portion has a wall thickness which increases from a central portion of the first recessed portion to said at least one of the end portions of the bottom surface in the circumferential direction of the cylindrical body portion.
  • the first weakened portion includes the first recessed portion formed in the circumferential direction of the body portion, which makes productivity excellent and management of dimensional accuracy easier. This is capable of preferably setting a relief pressure for releasing pressure in the gas chamber.
  • the hydraulic accumulator includes the first weakened portion of the first recessed portion, which makes it easy for buckling to occur on the body portion of the self-seal stay in a range of forming the first recessed portion. Therefore, when the pressure and the temperature of a high-pressure gas in the gas chamber excessively increase, this securely induces buckling, which makes the high-pressure gas in the gas chamber securely released at a proper timing. Especially, downsizing of the hydraulic accumulator makes height of the self-seal stay smaller, which makes it difficult for the self-seal stay to buckle. This is preferable for downsizing the hydraulic accumulator.
  • the pressure or temperature of the gas chamber is more than a given threshold, the pressure of the gas chamber for pressing against the head portion induces buckling on the body of the self-seal stay, and the body portion is deformed such that the head portion inclines to the end portion of the bellows. Therefore, the through hole formed in the head portion of the self-seal stay comes in contact with the end portion of the bellows to be opened from a closed state, thereby enabling the high-pressure gas in the gas chamber to be released through the through hole.
  • the bottom surface is formed of a plane surface or a circular arc shaped curved surface, and at least one of both the end portions of the bottom surface in the circumferential direction is joined with the outer circumferential surface of the body portion, so that a thickness of body portion at the bottom surface of the first recessed portion increases from the central portion of the bottom surface of the first recessed portion to said at least one of both the end portions. Therefore, an initial buckling occurs on the central portion of the recessed portion in the circumferential direction of the body portion, and this initial buckling triggers buckling which develops to the at least one of both the end portions of the first recessed portion.
  • the degree of buckling indicates the property that the axial flexure of the body portion is larger at the central portion of the first recessed portion and smaller at the at least one of both the end portions of the first recessed portion.
  • the hydraulic accumulator properly regulates a release pressure of the high-pressure gas. This regulation avoids explosive release in which a high-pressure gas is suddenly and instantaneously discharged, thereby effectively preventing explosive noise and shock from occurring at releasing of the high-pressure gas.
  • the hydraulic accumulator reduces the number of steps for fabrication with a simple construction. Also, the hydraulic accumulator facilitates regulating a relief pressure for releasing the pressure in the gas chamber. The hydraulic accumulator releases the high-pressure gas in the gas chamber at a proper timing. In addition, the hydraulic accumulator properly regulates the relief pressure of the high-pressure gas, and thereby effectively prevents noise or the like from occurring at releasing of the high-pressure gas.
  • the first recessed portion may have in the circumferential direction a length of a groove which is approximately half of a circumferential length of the body portion.
  • the length of the groove of the first recessed portion having approximately half of a circumferential length of the body portion makes an axial support rigidity appropriately set, thereby facilitating occurrence of buckling at a proper timing.
  • the first weakened portion may include a second weakened portion extending from the first recessed portion in an axial direction of the body portion.
  • Providing the first weakened portion with the second weakened portion makes an axial support rigidity of the first recessed portion further appropriately set, which facilitates occurrence of buckling at a proper timing.
  • the above hydraulic accumulator reduces the number of steps for fabrication with the simple construction. Also, the hydraulic accumulator facilitates regulating a relief pressure for releasing the pressure in the gas chamber. The hydraulic accumulator releases the high-pressure gas in the gas chamber at a proper timing. In addition, the hydraulic accumulator properly regulates the relief pressure of the high-pressure gas, and thereby effectively prevents noise and shock from occurring at releasing of the high-pressure gas.
  • the hydraulic accumulator as illustrated in FIG. 1 , includes a shell 2 of a pressure container, a gas chamber 3 and a fluid chamber 4 formed inside the shell 2, the gas chamber 3 having a high-pressure gas G sealed therein, the fluid chamber 4 having hydraulic fluid Q introduced from a hydraulic circuit such as a brake circuit not illustrated, a bellows 5 expandably and contractibly housed in the shell 2, a port portion 6 of the shell 2 formed with a hydraulic-fluid inlet 61 open to the fluid chamber 4, and a self-seal stay 8 disposed in the fluid chamber 4 and covering the port portion 6.
  • the bellows 5 is a partition member which serves as a boundary between the gas chamber 3 and the fluid chamber 4.
  • the bellows 5 includes an expansion-contraction portion 50 formed as bellows, an end portion 51 fixed to the end of the expansion-contraction portion 50, bellows guides 52 formed in a piece shape and supporting slidably the expansion-contraction portion 50, and a seal member 53 disposed on the end portion 51 (underside on FIG. 1 ).
  • the self-self stay 8 is formed in a cap shape of a lower height and includes a cylindrical body portion 8a and a lid-shaped head portion 8b.
  • the self-seal stay 8 includes a through hole 81 formed at the central portion of the head portion 8b, and a weakened portion 9 formed on the body portion 8a.
  • the self-seal stay 8 has a function of limiting an expansion volume of the gas chamber 3 and supporting the bellows 5 so as not to be excessively compressed.
  • a motion of the hydraulic accumulator 1 in a range of an expected motion is referred to as a "motion during a normal operation" ( FIGS. 1 and 2 ).
  • this motion state is referred to as an "motion during an abnormal operation" to be distinguished from one during the normal operation for convenience of explanation ( FIGS. 7 to 10 ).
  • the shell 2 is a pressure container with a sealed structure.
  • the shell 2 includes a cylindrical body portion 21 having a bottom portion 21a, a lid plate 22 welded to the opening end of the body portion 21, and a gas filling inlet 22a disposed in the lid plate 22.
  • the gas chamber 3 is a space enclosed mainly with the bellows 5, the lid plate 22, and the body portion 21 of the shell 2.
  • the gas chamber 3 is formed on a lid 22 side in the axial direction of the shell 2 (an end portion side opposite to the port portion 6), and a high-pressure gas G is filled therein from the gas filling inlet 22a.
  • the gas chamber 3 includes a first gas chamber 31 formed above the bellows 5, and a second gas chamber 32 formed on a outer circumferential wall side of the bellows 5 (outside of the circumferential wall, serving as a boundary, of the bellows 5).
  • the first gas chamber 31 and the second gas chamber 32 communicate with each other and have equal pressures respectively.
  • the fluid chamber 4, as illustrated in FIG. 2 includes, with the through hole 81 of the self-seal stay 8 closed, a first fluid chamber 41 formed on the inside of the self-seal stay 8 (hydraulic-fluid inlet 61 side), and a second fluid chamber 42 formed on the outside of the self-seal stay 8 (inside of the circumferential wall, serving as a boundary, of the bellows 5).
  • the first fluid chamber 41 is a region inside the self-seal stay 8, which is enclosed mainly by the self-seal stay 8 and the bottom portion 21a of the shell 2.
  • the second fluid chamber 42 is a region interposed mainly between the inner circumferential wall of the bellows 5 and the outside of the self-seal stay 8.
  • hydraulic fluid Q (hydraulic oil) is introduced into the first fluid chamber 41 from the hydraulic circuit (not illustrated) of the brake circuit or the like through the hydraulic-fluid inlet 61 formed in the port portion 6.
  • the hydraulic fluid Q flows through clearances formed on the both sides of a bellows guide 52 of a piece shape to be filled up to the second chamber 42.
  • the first fluid chamber 41 and the second fluid chamber 42 communicate with each other via the through hole 81, and the respective pressures are equal to each other.
  • the seal member 53 prevents the first fluid chamber 41 and the second fluid chamber 42 from communicating with each other. Therefore, the first fluid chamber 41 communicates with the hydraulic circuit not illustrated, while the second fluid chamber 42 serves as an independent sealed chamber.
  • the expansion-contraction portion 50 of the bellows 5 is an expansion-contraction member which is formed in a bellows and circular shape and has a hollow internal portion.
  • the expansion-contraction portion 50 is a metal member which bears against the internal pressure of the high-pressure gas G.
  • the expansion-contraction portion 50 includes one end (lower end of FIG. 1 ) which is in tight contact with the bottom portion 21a of the shell 2 and is hermetically fixed on it, and the other end (upper end of FIG.1 ) which is in tight contact with the end portion 51 and is fixed on it so as to render the inside hermetic.
  • the end portion 51 of the bellows 5 is a disk-shaped member to seal the opening portion of the head portion of the bellows 5, and may be constituted by a so-called bellows cap.
  • the bellows 5 operates so as to expand in an axial direction under a gas pressure in the gas chamber 3 sealed above the bellows 5 and on the outer circumferential wall side of the bellows 5.
  • the bellows 5 operates so as to contract to the inner circumferential wall side of the bellows 5 under a hydraulic pressure of the fluid introduced from the hydraulic circuit (not illustrated).
  • the bellows 5 expands and contracts to make the gas pressure and hydraulic pressure balance with each other to prevent the pulsation of hydraulic circuit (not illustrated), thereby regulating the hydraulic fluid to a given hydraulic pressure.
  • the bellows guides 52 are piece-shaped sliding members each having an L-shaped section for reducing friction resistance.
  • the bellows guides 52 are fixed on the outer circumferential end of the end portion 51 fixed to the expansion-contraction portion 50.
  • the bellows guides 52 are equally arranged at two to four positions on a circle with appropriate clearances, so that the bellows 5 is capable of smoothly expanding and contracting and the first gas chamber 31 and the second gas chamber 32 communicate with each other.
  • the seal member 53 employs an elastic member such as a rubber for enhancing hermetic ability during a normal operation. It is noted that though under an excessive high-temperature and high-pressure state the seal member 53 is fused or carbonized to lose its sealability, it is not especially limited to it.
  • the port portion 6 is a portion which is formed integrally with the bottom portion 21a of the shell 2 and includes the circumference of the hydraulic-fluid inlet 61.
  • the port portion 6 includes a body portion 62 connected to the hydraulic circuit (not illustrated) by a pipe arrangement and a joint not illustrated; and a hydraulic-fluid flow passage 61a which extends through the body portion 62 and the bottom portion 21a of the shell 2 and communicates with the hydraulic-fluid inlet 61.
  • the port portion 6 forming a port portion of the shell 2 is formed integrally with the shell 2 in view of stiffness and hermetic ability or the like, it is not limited to this.
  • a port member (not illustrated) separate from the shell 2 may be fixed on the shell 2.
  • a fixation means such as welding ensures the hermetic ability and the port member is fixed on the shell 2.
  • the self-seal stay 8 as illustrated in FIGS. 3A to 3C , includes a thin weakened portion 9 on the body portion 8a (first weakened portion).
  • first weakened portion When the pressure of the gas chamber 3 is more than a given threshold, pressure of the gas chamber 3 for pressing against the head portion 8b and the pressure of the second fluid chamber 42 for pressing against the body portion 62 cause the weakened portion 9 of the body portion 8a to be collapsed under pressure.
  • the head portion 8b inclines to the end portion 51 of the bellows 5. This makes the through-hole 81 formed in the head portion 8b of the self-seal stay 8 opened.
  • the weakened portion 9 includes a groove-shaped recessed portion 91 of a primary weakened portion formed in a circumferential direction of the body portion 8a; and an auxiliary weakened portion 92 (second weakened portion) of a back-facing-hole shape.
  • the groove-shaped recessed portion 91 (first recessed portion) is a belt-shaped groove formed at approximately the central portion in the vertical direction of the body portion 8a.
  • the groove has a length ⁇ in the circumferential direction of the body portion 8a (refer to FIG. 3A ), which is approximately half length of the circumferential length (whole circumferential length) of the body portion 8a.
  • This "approximately half length” includes a half length, and means a length a little longer than the half and a length a little shorter than the half.
  • This construction ensures the groove length ⁇ up to the approximately half of the circumferential length of the body portion 8a, and appropriately sets an axial support rigidity at the central portion of the groove, thereby facilitating occurrence of buckling at a proper timing.
  • the grove-shaped recessed portion 91 includes paired sidewall portions 91a and 91a facing each other; and a bottom surface 91b formed between the sidewall portions 91a and 91a.
  • the bottom surface 91b of the recessed portion 91 has a curved surface of a circular arc shape which is convex from the inside of the body portion 8a to the outside thereof.
  • the bottom surface 91b includes both the circumferential end portions 91c which pass through to or reach the outer circumferential surface of the body portion 8a.
  • both the end portions 91c do not have any thickness-directional steps at the boundary between the outer circumferential surface and the bottom surface 91b of the recessed portion 91, and the bottom surface 91b is smoothly integrated or joined with the outer circumferential surface of the body portion 8a. That is, both the end portions 91c and the outer circumferential surface of the body portion 8a are continuous with each other.
  • the curved surface of the bottom surface 91b in the recessed portion 91 is larger in curvature radius than the outer circumferential surface of the body portion 8a. It is noted that at least one of both the end portions 91c in the circumferential direction of the bottom surface 91b may join with the outer circumferential surface of the body portion 8a.
  • thickness t1 of the body portion 8a at the central portion of the recessed portion 91 in the circumferential direction is smaller, each thickness t2 of both the end portions 91c of the recessed portion 91 is gradually larger than that of the central portion, and each thickness of the both the end portions 91c are equal to that of the body portion 8a.
  • the auxiliary weakened portion 92 is a recessed portion which is formed such that it extends from the recessed portion 91 along the outer circumferential portion of the body portion 8a in the axial direction so as to overlap with the groove-shaped recessed portion 91.
  • the auxiliary weakened portion 92 has a back-facing-hole shape with a bottom which is formed to the groove-shaped recessed portion 91 at the central portion in the circumferential direction and the axial direction.
  • the auxiliary weakened portion 92 of a back-facing-hole shape has a bottom surface having a central portion of a thickness t1 (refer to FIG. 3B ).
  • the weakened portion 9 is constituted with two configurations of the primary weakened portion and the auxiliary weakened portion, it is not limited to this. It may be only the recessed portion 91 of the primary weakened portion (refer to FIGS. 4A and 4B ).
  • the self-seal stay 8A according to the first modification differs from the self-seal stay 8 ( FIGS. 3A to 3C ) in not including the auxiliary weakened portion 92 ( FIG. 3A to 3C ), the other components are the same and the redundant explanations are omitted.
  • auxiliary weakened portion 92 is provided by considering the shape of the self-seal stay and setting pressure of the gas chamber 3 or the like. Provision of the auxiliary weakened portion 92 further appropriately sets the groove-shaped recessed portion 91 to an axial support rigidity, thereby facilitating occurrence of buckling at a proper timing.
  • the bottom surface 91b of the groove-shaped recessed portion 91 is formed with a circular arc-shaped curved surface, it is not limited to this. As illustrated in FIGS. 5A to 5C and FIGS. 6A to 6C , in order to reduce the number of steps of fabrication the bottom surface may be not a curved surface but a plane surface.
  • the self-seal stay 8B includes a groove-shaped recessed portion 91B, which includes paired sidewall portions 91aB and 91aB facing each other; and a bottom surface 91bB of a plane surface formed between the sidewall portions 91aB and 91aB.
  • the auxiliary weakened portion 92B has the same configuration, and the specific explanations are omitted.
  • the self-seal stay 8B according to the example 1 of the second modification includes the auxiliary weakened portion 92B
  • the self-seal stay 8B1 according to the example 2 of the second modification illustrated in FIGS. 6A to 6C may not be provided with the auxiliary weakened portion 92B.
  • the self-seal stay 8B1 according to the example 2 of the second modification differs from the self-seal stay 8B according to the example 1 of the second modification in not including the auxiliary weakened portion 92B, the other components are the same, and the same components are attached with the same characters and the redundant explanations are omitted.
  • the bottom surface 91bB of the recessed portion 91B is a plane surface formed perpendicular to the radial direction in plane view. Both the end portions 91cB in a circumferential direction of the bottom surface 91bB pass through to or reach the outer circumferential surface of the body portion 8a. Therefore, both the end portions 91cB do not have any thickness-directional steps at the boundaries between the outer circumferential surface and the bottom surface 91bB of the recessed portion 91B, and the bottom surface 91bB is smoothly integrated or joined with the outer circumferential surface of the body portion 8a. That is, both the end portions 91cB are continuous with the outer circumferential surface of the body portion 8a.
  • thickness t1 of the body portion 8a at the central portion of the recessed portion 91B in the circumferential direction is smaller, each thickness t2 of both the end portions 91cB of the recessed portion 91B is gradually larger than that of the central portion, and each thickness of the both the end portions 91cB are equal to that of the body portion 8a.
  • the seal member 53 disposed on the bottom surface of the end portion 51 of the bellows 5 comes into contact with the head portion 8b of the self-seal stay 8, the seal member 53 closes the through hole 81 formed in the head portion 8b of the self-seal stay 8, thereby putting the hydraulic-fluid inlet 61 into a closed state.
  • the first fluid chamber 41 has a pressure equal to that of the hydraulic circuit (not illustrated) of the brake circuit or the like not illustrated, while the second fluid chamber 42 is put in a sealed state.
  • the weakened portion of the self-seal stay 8 is collapsed under pressure, thereby inducing buckling on the body portion 8a.
  • the weakened portion 9 is designed such that when the pressure in the gas chamber 3 reaches preset given threshold, the weakened portion 9 is collapsed under pressure, thereby inducing buckling on the body portion 8a. At this time, the buckling occasionally causes the weakened portion 9 to be broken.
  • the through hole 81 is opened.
  • the hydraulic fluid Q in the sealed second fluid chamber 42 flows out to the first chamber 41 through the through hole 81, thereby decreasing the pressure in the second fluid chamber 42. Also, if the weakened portion 9 has a broken portion, the hydraulic fluid Q flows out from it.
  • the pressure of the high-pressure gas G in the first gas chamber 31 causes the hydraulic fluid Q in the first fluid chamber 41 and the second fluid chamber 42 to flow out from the hydraulic-fluid inlet 61.
  • the high-pressure gas G in the first gas chamber 31 flows out from the second gas chamber 32 through the second fluid chamber 42 and the first fluid chamber 41, thereby decreasing the pressure of the high-pressure gas G in the gas chamber 3.
  • the above constructed hydraulic accumulator 1 according to the embodiment serves the following function and advantageous effect.
  • Providing the hydraulic accumulator 1 with the weakened portion 9 facilitates occurrence of buckling on the body portion 8a of the self-seal stay 8, thereby securely inducing buckling so that the high-pressure gas G in the gas chamber 3 is released at a proper timing. Therefore, it is preferable for the hydraulic accumulator 1 (refer to FIG. 3C ) which has a height smaller than the diameter of the body portion 8a and makes it difficult for buckling to occur.
  • Providing the hydraulic accumulator 1 with the weakened portion 9 induces buckling at the central portion of the recessed portion 91 (refer to FIGS. 3A to 3C ) at an initial stage.
  • This initial buckling triggers buckling which develops to both the end portions 91c of the groove-shaped recessed portion 91, thereby enlarging the range of the buckling.
  • the buckling since buckling at the central portion of the groove-shaped recessed portion 91 is induced at a proper timing, the buckling develops over the whole groove-shaped recessed portion 91 so as to extend in the circumferential direction. For this, a short given necessary time difference from occurrence of the buckling to completion of it is set. Therefore, the high-pressure gas G in the gas chamber 3 is gently released from the through hole 81 formed in the head portion 8b of the self-seal stay 8 with taking a given necessary time.
  • the hydraulic accumulator 1 is capable of properly regulating a release pressure of the high-pressure gas G, and this regulation avoids explosive release in which a high-pressure gas is suddenly and instantaneously discharged, thereby effectively preventing explosive noise and shock from occurring.
  • the invention is not limited to the above-described embodiment, but is enabled to be appropriately modified and performed.
  • the self-seal stay 8 of the embodiment has a cap shape having a height smaller than the diameter of the body portion 8a, it is not limited to this.
  • the configuration of the weakened portion 9 is enabled to appropriately set buckling load for inducing buckling. Therefore, as a self-seal stay 8C according to a third modification illustrated in FIG. 11A , the invention may be applied to the self-seal stay 8C having a height equal to the diameter of the body portion 8a.
  • the auxiliary weakened portion 92 is formed on the groove-shaped recessed portion 91 at the axial central portion, it is not limited to this.
  • an auxiliary weakened portion of a back-facing-hole shape may be formed on the recessed portion 91 at the upper position than the center, or as a self-seal stay 8E illustrated in FIG. 11C it may be formed at the lower position than the center.
  • the auxiliary weakened portion 92D is formed on the recessed portion 91 at the upper position than the center (refer to FIG.
  • the buckling load of the auxiliary weakened portion 92D is decreased to induce buckling at an earlier stage. If the auxiliary weakened portion 92E is formed on the recessed portion 91 at the lower position than the center (refer to FIG. 11C ), the buckling load of the auxiliary weakened portion 92E is increased to induce buckling at a further delayed stage.
  • the bellows 5 may be disposed at the lid plate 22 side.
  • a hydraulic accumulator 1F according to a fourth modification illustrated in FIG. 12 though disposition of a bellows 5F is different, the other components and the motion are the same as those of the hydraulic accumulator 1 (refer to FIG. 1 ) and the specific explanation is omitted.
  • the through hole 81 is formed at the central portion of the head portion 8b, it is not limited to this.
  • the through hole 81 may be offset from the central portion of the head portion 8b and disposed close to the circumferential central portion of the groove-shaped recessed portion 91 so as to come close to the auxiliary weakened portion 92 side.
  • This construction makes a buckling load set smaller to induce buckling at an earlier stage, and further smoothly accelerates flowing out of the high-pressure gas G from the through hole 81.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Claims (5)

  1. Ein hydraulischer Akkumulator (1), umfassend
    eine Schale (2) mit einem Innenraum, worin sich eine Gaskammer (3) befindet, die mit einem Druckgas befüllt wird, und worin sich eine Flüssigkeitskammer (4) befindet, die mit einer Hydraulikflüssigkeit befüllt wird;
    einen Balg (5), der aus- und einziehbar und in der Schale (2) installiert ist, wobei durch den Balg (5) der Innenraum in die Gaskammer (3) und in die Flüssigkeitskammer (4) unterteilt wird und der Balg (5) an dessen Endabschnitt eine Balgkappe (51) aufweist;
    ein Anschlussstück (6), das mit der Schale (2) verbunden ist und einen Hydraulikflüssigkeitseinlass (61) definiert, der mit der Flüssigkeitskammer (4) kommuniziert; und
    eine selbstdichtende Strebe (8), die in der Flüssigkeitskammer (4) montiert ist und einen zylindrischen Körperabschnitt (8a) umfasst, mit dem das Anschlussstück (6) umschlossen wird; und ein deckelförmiges Kopfteil (8b), das ein Durchgangsloch (81) definiert und sich vom zylindrischen Körperteil (8a) aus erstreckt, wobei das Durchgangsloch (81) so konfiguriert ist, dass es mit der Balgkappe (51) geschlossen wird, wenn sie mit dem Kopfteil (8b) in Kontakt kommt;
    wobei der zylindrische Körperabschnitt (8a) einen ersten ausgesparten Abschnitt (91) umfasst, der in einer äußeren Umfangsfläche des zylindrischen Körperabschnitts (8a) ausgespart ist, sich in eine Umfangsrichtung des zylindrischen Körperabschnitts (8a) erstreckt und eine Bodenfläche (91b) aufweist, die eben ist oder eine gebogene Form eines Kreisbogens aufweist, so dass der erste ausgesparte Abschnitt (91) verformt wird, wenn ein Gasdruck in der Gaskammer (3) eine vorbestimmte Schwelle überschreitet;
    dadurch gekennzeichnet, dass
    mindestens einer der beiden Endabschnitte der Bodenfläche (91b) in der Umfangsrichtung mit der äußeren Umfangsfläche des zylindrischen Körperabschnitts (8a) verbunden ist; und
    der erste ausgesparte Abschnitt (91) eine Wanddicke aufweist, die von einem mittleren Teil des ersten ausgesparten Abschnitts (91) zu dem mindestens einen der Endabschnitte der Bodenfläche (91b) in Umfangsrichtung des zylindrischen Körperabschnitts (8a) zunimmt.
  2. Der hydraulische Akkumulator (1) nach Anspruch 1, wobei der erste ausgesparte Abschnitt (91) in Umfangsrichtung eine Länge einer Nut aufweist, die ungefähr der Hälfte einer Umfangslänge des zylindrischen Körperabschnitts (8a) entspricht.
  3. Der hydraulische Akkumulator (1) nach Anspruch 1, wobei der erste zylindrische Körperabschnitt (8a) einen zweiten ausgesparten Abschnitt (92) aufweist, der in der äußeren Umfangsfläche des zylindrischen Körperteils (8a) ausgespart ist und sich vom ersten ausgesparten Abschnitt (91) in einer axialen Richtung des zylindrischen Körperabschnitts (8a) erstreckt.
  4. Der hydraulische Akkumulator (1) nach Anspruch 1, wobei die Bodenfläche (91b) des ersten ausgesparten Abschnitts (91) im Krümmungsradius größer ist als die äußere Umfangsfläche des zylindrischen Körperabschnitts (8a).
  5. Der hydraulische Akkumulator (1) nach Anspruch 1, wobei der mindestens eine der beiden Endabschnitte der Bodenfläche (91b) des ersten ausgesparten Abschnitts (91) mit der äußeren Umfangsfläche des zylindrischen Körperabschnitts (8a) fortlaufend ist.
EP16172377.0A 2016-06-01 2016-06-01 Hydraulischer akkumulator Active EP3252318B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16172377.0A EP3252318B1 (de) 2016-06-01 2016-06-01 Hydraulischer akkumulator
ES16172377T ES2737727T3 (es) 2016-06-01 2016-06-01 Acumulador hidráulico

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Application Number Priority Date Filing Date Title
EP16172377.0A EP3252318B1 (de) 2016-06-01 2016-06-01 Hydraulischer akkumulator

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EP3252318A1 EP3252318A1 (de) 2017-12-06
EP3252318B1 true EP3252318B1 (de) 2019-05-08

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Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JP2003172301A (ja) 2001-12-04 2003-06-20 Nhk Spring Co Ltd アキュムレータ
JP5139959B2 (ja) * 2008-11-26 2013-02-06 Ｎｏｋ株式会社 アキュムレータ
JP5108733B2 (ja) * 2008-11-27 2012-12-26 Ｎｏｋ株式会社 アキュムレータ
JP5637394B2 (ja) 2011-05-13 2014-12-10 イーグル工業株式会社 金属ベローズ式アキュムレータ

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EP3252318A1 (de) 2017-12-06

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