Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
  • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
  • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
  • B60T17/06—Applications or arrangements of reservoirs
• • 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
  • 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
  • F15B1/22—Liquid port constructions
• • 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
  • F15B2201/20—Accumulator cushioning means
  • F15B2201/205—Accumulator cushioning means using gas
• • 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
• • 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
  • F15B2201/3157—Sealings for the flexible separating means
• • 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
  • F15B2201/40—Constructional details of accumulators not otherwise provided for
  • F15B2201/41—Liquid ports
  • F15B2201/411—Liquid ports having valve means
• • 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
  • F15B2201/40—Constructional details of accumulators not otherwise provided for
  • F15B2201/415—Gas ports

Definitions

• the present invention relates to a hydraulic accumulator for storing pressurized liquid, and in particular, a metal partitioned into a gas chamber in which pressurized gas is enclosed and a liquid chamber communicated with the outside by a metal bellows unit capable of expanding and contracting inside.
• a hydraulic accumulator for storing pressurized liquid, and in particular, a metal partitioned into a gas chamber in which pressurized gas is enclosed and a liquid chamber communicated with the outside by a metal bellows unit capable of expanding and contracting inside.
• a shell forming a pressure space, a pressure gas which is located in the pressure space and whose one end is fixed to one end wall of the shell
• a bellows-like stretchable metal bellows unit defining an outer gas chamber in which the liquid is sealed and an inner liquid chamber communicating with the liquid inlet / outlet formed at the one end wall;
• pressure liquid for example, it is shown in the gazette of Unexamined-Japanese-Patent No. 2 0 0 1 1 0 0 3.
• the seal member seated on the seal seat may be fixed to the seal seat and it may be difficult to leave the seal seat.
• a shell forming a pressure space, an end of the self located at the pressure space and an end wall of the shell fixed to the end wall of the shell, the pressurized gas
• a stopper for defining the amount of contraction of the metal bellows is provided in the liquid chamber, and a liquid in which the inner peripheral surface of the bellows-like part of the metal bellows is exposed.
• a liquid chamber in which the inner peripheral surface of the bellows-like part of the metal bellows is exposed and the liquid inlet / outlet are always communicated with each other through the communication passage, and a seal for preventing atmospheric pressure from acting inside the bellows-like part of the metal bellows.
• the stopper described above is a bottomed cylinder having a bottom wall portion engageable with the plate portion of the metal bellows union and an open end fixed to the end wall of the shell to define the amount of contraction of the metal bellows unit. It is preferable that it is a rod-like member.
• the bottomed tubular member divides the liquid chamber into an internal liquid chamber in which the liquid inlet / outlet communicates and an external liquid chamber in which the inner peripheral surface of the bellows-like portion in the metal bellows jet is exposed.
• a communication passage connecting the internal fluid chamber and the external fluid chamber is formed on the bottom wall of the bottomed cylindrical member.
• Rubber play G is provided between the plate portion of the metal bellows unit and the bottom wall of the bottomed cylindrical member. The rubber plate is provided so as to maintain the communication between the internal liquid chamber and the external liquid chamber even when the plate portion of the metal bellows unit abuts on the bottom wall of the bottomed cylindrical member.
• the gas pressure of the pressurized gas sealed in the gas chamber is preferably set in the range of 2 to 9 M Pa.
• the initial braking force can be secured (can be achieved by setting the gas pressure to 2 MPa or more) and the required life of the metal bellows unit. It is possible to achieve both (to be possible by reducing the gas pressure to 9 MP a or less).
• the cylindrical portion of the metal bellows is constructed as compared to the case where a U-shaped metal bellows seal is adopted as the cross section of the portion constituting the cylindrical portion as the metal bellows seal. It is possible to reduce the minimum pitch (pitch in the compressed state) at the part, and to make the hydraulic accumulator compact.
• FIG. 1 is a block diagram schematically showing an embodiment in which a metal bellows accumulator according to the present invention is adopted for a brake of an automobile.
• FIG. 2 is a cross-sectional view of a state where pressurized fluid is not accumulated in the hydraulic pressure accumulator shown in FIG.
• FIG. 3 is an enlarged sectional view of a main part of FIG.
• FIG. 4 is a view showing the movable plate shown in FIG. 2 and FIG. 3 and four rubber plates fixed to the lower surface of the movable plate.
• FIG. 5 is an operation explanatory diagram when pressurized fluid is accumulated in the hydraulic pressure accumulator shown in FIG.
• FIG. 6 is a sectional view of an essential part showing another embodiment of metal bellows in the metal bellows accumulator according to the present invention.
• FIG. 1 schematically shows an embodiment in which the metal bellows accumulator A according to the invention is adopted for braking of a motor vehicle, in this embodiment a hydraulic pump P driven by an electric motor M to a check valve V
• the pressurized fluid accumulated in the hydraulic pressure accumulator A through the pressure reservoir H is supplied to the hydraulic pressure booster H / B that operates in response to the depression of the brake pedal BP and is used as an assist pressure for the master cylinder M / C.
• the hydraulic pump P is connected to the reservoir R, and the master cylinder MZC is connected to the reservoir R and the wheel cylinder WZC, respectively.
• the drive of the electric motor M is controlled by the electric control unit ECU in response to a signal from the pressure sensor S which detects the pressure of the pressurized fluid accumulated in the fluid pressure accumulator A in the state of the ignition ON. (Specifically, the operation is stopped at the pump OFF pressure in Figure 5, and the operation is restarted at the pump ON pressure).
• the hydraulic accumulator A is provided with a main shell 12 forming a pressure space 11 and a bellows-like metal bellows unit 1 3 disposed in the pressure space 11.
• the main shell 12 is composed of upper and lower two members, and these members are joined in a liquid tight manner, and a plug member 14 for sealing the gas filling port is airtight on the upper end wall 12a. Is attached to
• the metal bellows 13 is a cylindrical metal bellows 13a, and a movable plate 13b and a metal movable plate airtightly and fluidly coupled to the upper end of the bellows 13a.
• the lower end of the bellows 13 3 a is airtightly and liquid-tightly fixed to the lower end wall 12 b of the main shell 12, and the pressure space 11 has a predetermined value (2 to 9 MP a It communicates with the outer gas chamber 15 where the pressurized gas of the enclosed gas pressure set in the range is enclosed and the liquid inlet / outlet 1 2 c formed on the lower end wall 12 b of the main shell 12 It is divided into the inner liquid chamber 1 6.
• an auxiliary shell 17 is disposed in the metal bellows 13, that is, in the liquid chamber 16, and cushions the abutment between the auxiliary shell 17 and the movable plate L / 1 13 b.
• four rubber plates 18 are fixed at equal intervals in the circumferential direction on the lower surface of the movable plate 1 3 b in order to always form a gap D therebetween. And see Figure 4).
• the auxiliary shell 17 also functions as a stout to define the amount of contraction of the metal bellows unit 13 which is in the free state shown by the phantom line in FIG.
• a bottomed cylindrical member having an upper bottom and a bottom wall portion 17b, and fixed to the lower end wall 12b of the shell 12 at the lower end as illustrated; It is divided into an internal fluid chamber 16 a where the inlet and outlet 12 c communicate and an external fluid chamber 16 b where the inner circumferential surface of the bellows 13 a in the metal bellows 13 is exposed.
• the internal liquid chamber 16a is always in communication with the external liquid chamber 16b through the communication passage consisting of the communication hole 17c formed in the bottom wall 17b of the auxiliary shell 17 and the clearance D described above. .
• the pressure of the pressurized fluid supplied from the hydraulic pump P in FIG. 1 to the fluid inlet / outlet 12c through the check valve V is the pressure of the movable plate 13b through the communication hole 17c and the gap D described above. Acting on the entire area except for the rubber plate 18 presses the movable plate 13 b upward in Fig. 2 to ensure smooth extension operation of the metal bellows 13.
• the electric motor M starts to be driven by the ignition ON, and the pressure of the pressurized liquid accumulated in the hydraulic accumulator A is as shown in FIG. Go up to point b through point a.
• the metal bellows unit 13 is extended from the state shown by the solid line in FIG. 2 to the state shown by the virtual line along with the transition from point a to point b in FIG. Do.
• the electric motor M stops driving and thereafter descends toward the pump ON pressure.
• This drop in pressure is due to the pressurized fluid accumulated in the hydraulic pressure accumulator A leaking through the check valve V or the like, or being supplied to the hydraulic pressure booster H / B and used, etc.
• the metal bellows unit 13 is contracted toward the state shown by the solid line in FIG.
• the electric motor M resumes driving, and thereafter rises toward the pump OF pressure.
• the outer liquid chamber 16 b and the liquid inlet / outlet 12 c of the metal bellows unit 13 are exposed at all times through the gap D and the gap D, and the inner peripheral surface of the bellows 13 a is exposed.
• Seal structure to prevent atmospheric pressure from acting on the inside of bellows of metal bellows 13 (for example, in place of four rubber plates 18 on the lower surface of movable plate 13 b, an annular seal member It is not necessary to adopt a seal structure) that is made by For this reason, in any case, adhesion of the seal member employed in the seal structure to the seal seat (the upper surface of the auxiliary shell 17) does not occur, and the metal bellows 13 smoothly extends and liquid chamber 1 6 As long as the pressurized fluid is not accumulated in a predetermined amount, the pressure of the pressurized fluid does not become the pump off pressure (upper limit setting value), and the pressurized fluid is properly accumulated in the hydraulic accumulator A.
• the metal bellows 13 of the hydraulic accumulator A is shown by the solid line in FIG. 2 at the start of driving of the electric motor M by the ignition ON.
• the pressure of the pressurized fluid accumulated in the hydraulic pressure accumulator A rises rapidly toward the point c via the point a as shown by the imaginary line in FIG. For this reason, the pressure of the pressurized fluid reaches the pump OFF pressure in a state where the pressurized fluid is hardly accumulated in the fluid chamber 16, the electric motor M stops driving, and the pressurized fluid to the hydraulic accumulator A is Accumulation is not properly done. Therefore, at this time, there is a possibility that pressurized fluid can not be supplied from the hydraulic pressure accumulator A to the hydraulic pressure booster H / B at the beginning of the ignition ON.
• the gas pressure (gas pressure in the state shown by the solid line in FIG. 2) enclosed in the gas chamber 15 is set in the range of 2 to 9 MP a
• the required service life of initial brake force can be achieved by setting gas pressure to 2 MPa or more
• metal bellows unit 1 3 requires gas pressure (gas pressure) It is possible to achieve both (9 MP a) or less).
• FIG. 2 and FIG. 3 as the metal bellows portion 13a in the metal bellows 13, a U-shaped cross section is adopted.
• FIG. 6 it is also possible to adopt an S-shaped cross section as the metal bellows 13a.
• the metal bellows 13a can be obtained.
• the minimum pitch (pitch in the compressed state) at the part (bellows-like part 13 a) constituting the cylindrical part of the metal bellows unit 13 is smaller than in the case where the U-shaped cross section is adopted. It is possible to make the hydraulic accumulator A compact.

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=29561413

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (15)

Citations (3)

Family Cites Families (12)

• 2002
  • 2002-05-29 JP JP2002155383A patent/JP4131130B2/ja not_active Expired - Fee Related
• 2003
  • 2003-05-28 AU AU2003241814A patent/AU2003241814A1/en not_active Abandoned
  • 2003-05-28 DE DE60317895T patent/DE60317895T2/de not_active Expired - Lifetime
  • 2003-05-28 EP EP03730655A patent/EP1508703B1/en not_active Expired - Lifetime
  • 2003-05-28 WO PCT/JP2003/006638 patent/WO2003100262A1/ja not_active Ceased
  • 2003-05-28 US US10/492,415 patent/US6871670B2/en not_active Expired - Fee Related

Patent Citations (3)

Non-Patent Citations (1)

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