JPH0610601U - Bladder for accumulator - Google Patents

Abstract

(57) [Abstract] [Purpose] When the central part moves toward the liquid chamber side, it holds the liquid between the inner peripheral surface of the shell and at least prevents the bending reversal part from excessively deforming, It relaxes buckling stress and suppresses the occurrence of cracks. [Structure] By forming at least one annular protrusion (11c) with respect to the outer peripheral surface of the central portion, when the poppet is brought into contact with the liquid inlet / outlet member, the annular protrusion (11c) is attached to the inner end surface of the liquid inlet / outlet member or The liquid is secured between the shell and the inner surface of the shell to prevent the liquid from moving. [Effect] When the central part moves toward the liquid chamber side, the liquid can be held between the inner peripheral surface of the shell and at least the bending reversal part can be prevented from being excessively deformed, and the buckling stress can be relaxed. It is possible to suppress the occurrence of cracks.

Description

[Detailed description of the device]

[0001]

[The purpose of the device]

[0002]

[Industrial applications]

 The present invention relates to an accumulator bladder in which an inner space of a shell is divided into a gas chamber and a liquid chamber, and in particular, at least one annular protrusion is formed on an outer peripheral surface of a central portion of the poppet so that a liquid inlet / outlet of a poppet is formed. An accumulator that contacts the inner end surface of the liquid inlet / outlet member or the inner peripheral surface of the shell when it comes into contact with a member (so-called “oil port”) to secure the liquid between it and the movement of the shell. It is related to the bladder.

[0003]

[Prior art]

 Conventionally, as this type of accumulator bladder, a central portion and a peripheral portion are connected to each other through a bending reversal portion, and the peripheral portion is disposed by being pressed by an attaching member against the inner peripheral surface of the shell of the accumulator. As a result, the internal space of the shell is divided into a gas chamber and a liquid chamber.The center of the shell projects toward the end face of the peripheral edge (and thus toward the gas chamber) without load, and the liquid pressure in the liquid chamber decreases. The central part moves in the direction of the liquid chamber (also referred to as the "discharging direction") along with the increase of the liquid pressure in the liquid chamber ) Was proposed.

[0004]

[Problems to be solved]

 However, in the conventional accumulator bladder, the central part and the peripheral part were only connected to each other via the bending reversal part, so that (i) as they are made of resin material with small elasticity, When moving in the discharge direction, the outer peripheral surface does not come into contact with the inner peripheral surface of the shell sequentially from the vicinity of the peripheral edge to the central part through the curved reversal part. As a result that the periphery of the central part (that is, the region between the central part and the curved inversion part) comes into contact with the inner peripheral surface of the shell while being separated from the peripheral surface, the central part is the liquid inlet / outlet member. To prevent a sudden reversal action in which the curved reversal part suddenly separates from the inner peripheral surface of the shell or suddenly abuts the inner peripheral surface of the shell when contacting or separating from the inner end surface of the shell. Even if it is possible, the curved inversion part is the inner circumference of the shell There is a drawback that it is not possible to suppress excessive deformation toward the direction, and (ii) there is a drawback that the vicinity of the center part is excessively deformed due to the poppet being arranged in the center part, which in turn (iii) There is a drawback that radial cracks are likely to occur at the curved reversal part and circumferential cracks are likely to occur near the center part. (iv) When the resin material with low elasticity is used. However, there was a point that durability was lacking and life could not be extended.

Therefore, in order to eliminate these drawbacks, the present invention forms at least one annular projection on the outer peripheral surface of the central portion so that the liquid inlet / outlet member is contacted when the poppet comes into contact with the liquid inlet / outlet member. The bladder for the accumulator is provided so as to be in contact with the inner end surface of the shell or the inner peripheral surface of the shell to secure the liquid between the shell and the movement thereof and to suppress the movement thereof.

[0006]

[Constitution of device]

[0007]

[Means for solving problems]

 The solution provided by the present invention is to solve the problem, "In an accumulator bladder that divides the internal space of the shell into a gas chamber and a liquid chamber, an annular ridge (11c; 31c) is formed on the outer peripheral surface of the central portion. On the other hand, it is a bladder for an accumulator characterized by being formed with at least one line.

[0008]

[Action]

 The accumulator bladder according to the present invention is an accumulator bladder in which the inner space of the shell is divided into a gas chamber and a liquid chamber, and is configured as described in the above [Problem solving method] column. In particular, since at least one annular protrusion is formed on the outer peripheral surface of the central portion, (i) when the central portion moves toward the liquid chamber side, the gap between the inner peripheral surface of the shell and The liquid has a function of holding the liquid, and thus (ii) at the time of moving the central portion toward the liquid chamber side, at least it has a function of preventing the bending reversal portion from excessively deforming, and (iii) at least the bending. It has the effect of relaxing the buckling stress applied to the inversion part and suppressing the occurrence of cracks, and as a result (iv) ensuring durability even when formed of a resin material with low elasticity. Function to extend life .

[0009]

【Example】

 Next, the bladder for accumulator according to the present invention will be specifically described with reference to the accompanying drawings, with reference to its preferred embodiments.

However, the embodiments described below are provided for facilitating or facilitating the understanding of the present invention, and not for limiting the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent replacements within the spirit and scope of the present invention.

(Description of the accompanying drawings)

FIG. 1 is a cross-sectional view showing a first embodiment of the accumulator bladder according to the present invention. In particular, one annular projection 11c is formed on the outer peripheral surface of the central portion 11A. The case is shown.

FIG. 2 is a cross-sectional view showing a use state of the embodiment shown in FIG. 1, which corresponds to a no-load state, in which the central portion 11A is inverted at the curved reversing portion 11C. It shows a state of protruding in the end face direction of the portion 11B (that is, the gas chamber 21A side).

FIG. 3 is a cross-sectional view for explaining the operation of the embodiment shown in FIG. 1, and in particular, the liquid pressure of the liquid supply source is reduced as compared with the state of FIG. 11A moves to the liquid chamber 21B side, the annular projection 11c formed on the outer peripheral surface of the central portion 11A abuts on the inner end surface of the liquid inlet / outlet member 24, and the poppet 13 still remains on the inner end surface of the liquid inlet / outlet member 24. Shows the state that is not dealt with.

FIG. 4 is a cross-sectional view for explaining the operation of the embodiment shown in FIG. 1, and in particular, the liquid pressure of the liquid supply source is further reduced as compared with the state of FIG. The annular projection 11c formed on the outer peripheral surface of the portion 11A is in contact with the inner end surface of the liquid inlet / outlet member 24 and the poppet 13 is in contact with the inner end surface of the liquid inlet / outlet member 24.

FIG. 5 is a sectional view showing a second embodiment of the accumulator bladder according to the present invention. In particular, two annular projections 31c are formed on the outer peripheral surface of the central portion 31A. The case is shown.

FIG. 6 is a cross-sectional view showing the usage state of the embodiment shown in FIG. 5, which corresponds particularly to the unloaded state, in which the central portion 31A is inverted at the curved reversing portion 31C and the peripheral edge is It shows a state of protruding in the end face direction of the portion 31B (that is, the gas chamber 41A side).

FIG. 7 is a cross-sectional view for explaining the operation of the embodiment shown in FIG. 5, in which the liquid pressure of the liquid supply source is reduced as compared with the state of FIG. 31A moves to the liquid chamber 41B side, the annular projection 31c formed on the outer peripheral surface of the central portion 31A abuts on the inner end surface of the liquid inlet / outlet member 44, and the poppet 33 still remains on the inner end surface of the liquid inlet / outlet member 44. Shows the state that is not dealt with.

FIG. 8 is a cross-sectional view for explaining the operation of the embodiment shown in FIG. 5, in which the liquid pressure of the liquid supply source is further reduced as compared with the state of FIG. The annular projection 31c formed on the outer peripheral surface of the portion 31A is in contact with the inner end surface of the liquid inlet / outlet member 44 and the poppet 33 is in contact with the inner end surface of the liquid inlet / outlet member 44.

(Structure of First Embodiment)

First, the configuration of a first embodiment of the accumulator bladder according to the present invention will be described in detail with reference to FIGS. 1 and 2.

Reference numeral 10 denotes an accumulator bladder according to the present invention, which is provided with respect to an elastic material layer 11 made of an appropriate elastic material such as rubber and an inside or a surface (here, an inner portion) of the elastic material layer 11. It includes a gas shielding layer 12 arranged as desired, and a poppet 13 arranged on the outer peripheral surface of the central portion 11 A of the elastic material layer 11. Here, the outer peripheral surface means a curve in a non-loaded state (that is, a state in which the central portion 11A is inverted at the curved reversing portion 11C and protrudes toward the end surface of the peripheral portion 11B (that is, the gas chamber 21A side described later)). The surface on the side where the reversal portion 11C projects (that is, the liquid chamber 21B side described later).

As will be described later, the elastic material layer 11 has a thickness of elasticity so as to ensure a seal between the inner peripheral surface of the shell 21 and the inner peripheral surface of the shell 21 when the elastic material layer 11 is mounted by the mounting member 22. The mounting portion 11a is formed of an appropriate elastic material such as rubber on the inner peripheral surface of the peripheral portion 11B (that is, the surface located on the side of the gas chamber 21A described later), and the inside of the shell 21 is also described later. The elastic protrusion 11b is formed on the outer peripheral surface of the peripheral portion 11B by using an appropriate elastic material such as rubber so as to ensure a seal with the inner peripheral surface of the shell 21 when it is attached to the peripheral surface by the mounting member 22. At least one line is formed.

The elastic material layer 11 further has a single annular protrusion 11c formed of an elastic material such as rubber on the outer peripheral surface of the central portion 11A and extending along the outer peripheral portion of the poppet 13. Has been done.

Although not shown in the drawings, the gas shielding layer 12 is made of a polyvinyl alcohol resin, at least one surface of a reinforcing material such as a woven fabric (for example, knitted fabric) or a non-woven fabric made of appropriate fibers. It is formed by arranging a resin film made of polyvinyl fluoride resin or vinylidene chloride resin, etc., having poor gas permeability, or a gas shielding film made of metal foil, and at least one layer of reinforcing material and one layer of gas shielding film are included. Have However, the gas shielding layer 12 may optionally omit the reinforcing material and only include at least one gas shielding film.

Reference numeral 20 denotes an accumulator, and the internal space of the shell 21 is divided into a gas chamber 21A and a liquid chamber 21B by the accumulator bladder 10 according to the present invention. That is, the accumulator bladder 10 according to the present invention is arranged so that the outer peripheral surface of the peripheral edge portion 11B of the elastic material layer 11 is brought into contact with the inner peripheral surface of the shell 21, and then the mounting member 22 By the elastic mounting portion 11a being pressed against the inner peripheral surface of the shell 21 by means of the elastic mounting portion 11a, the elastic mounting portion 11a is arranged with respect to the inner peripheral surface of the shell 21, and its internal space is partitioned into a gas chamber 21A and a liquid chamber 21B. .

The gas chamber 21A of the shell 21 is filled with an appropriate gas (for example, nitrogen gas) from the gas supply port 23a, and then the gas supply port 23a is closed by the closing member 23 and the sealing member 23b. It is enclosed by.

In the liquid chamber 21 B of the shell 21, a liquid inlet / outlet member (so-called “oil port”) 24 having a liquid proposal inner hole 24 a whose inner opening can be closed by the poppet 13 is provided. As a result, it is mounted on the oil port mounting opening) 21a, and then the base portion is welded. Therefore, the liquid chamber 21B is connected to an appropriate liquid supply source (not shown) through the liquid guide hole 24a, and an appropriate amount of liquid such as oil or brake oil is supplied according to the liquid pressure of the liquid supply source. Or water) is supplied.

(Operation of First Embodiment)

Further, with reference to FIGS. 1 to 4, the operation of the first embodiment of the accumulator bladder according to the present invention will be described in detail while briefly referring to the function of the accumulator.

No load

In the unloaded state, the accumulator bladder 10 according to the present invention has the central portion 11A thereof inverted by the curved reversing portion 11C as shown in FIG. 2 and the end surface of the peripheral portion 11B. It projects in the same direction (that is, the side corresponding to the gas chamber 21A).

At this time, since no load is applied to the inner peripheral surface and the outer peripheral surface of the curved inversion portion 11C, it is not deformed and is not subjected to stress.

During liquid ejection

When the liquid pressure of the liquid supply source decreases as compared with the state shown in FIG. 2, the accumulator bladder 10 according to the present invention has the central portion 11A on the liquid chamber 21B side (that is, in the “discharging direction”). )), And gradually stops as indicated by arrow A, and stops at a position where the pressures applied to both surfaces thereof (that is, the gas pressure in gas chamber 21A and the liquid pressure in liquid chamber 21B) are in equilibrium with each other.

At this time, the bending reversal portion 11C is subjected to a load on both the inner peripheral surface and the outer peripheral surface thereof, but is not yet significantly deformed and is not subjected to a large stress.

When the liquid pressure of the liquid supply source is further reduced, the accumulator bladder 10 according to the present invention, as shown in FIG. 3, has its central portion 11A on the liquid chamber 21B side (that is, in the "discharging direction"). Further, as shown by the arrow A, the annular projection 11c formed on the outer peripheral surface of the central portion 11A is brought into contact with the inner end surface of the liquid inlet / outlet member 24.

At this time, the liquid is held between the accumulator bladder 10 according to the present invention and the inner peripheral surface of the shell 21, and the movement thereof is blocked. Therefore, the bending reversal portion 11C can be prevented from being further deformed and can be prevented from receiving a large stress. That is, the accumulator bladder 10 according to the present invention can alleviate the buckling stress of the bending reversal portion 11C, and can suppress the elastic material layer 11 and the gas shielding layer 12 from being damaged.

When the liquid pressure of the liquid supply source decreases as compared with the state shown in FIG. 3, the accumulator bladder 10 according to the present invention has a central portion 11A having a liquid chamber 21B as shown in FIG. The poppet 13 is moved toward the side (that is, the "discharging direction") as shown by the arrow A, and the poppet 13 is brought into contact with the inner end surface of the liquid inlet / outlet member 24 to close the liquid guide hole 24a.

During liquid inhalation

On the other hand, when the liquid pressure of the liquid supply source is increased as compared with the state shown in FIG. 4, the accumulator bladder 10 according to the present invention, as shown in FIG. The gas moves toward the gas chamber 21A (that is, the "suction direction") as indicated by arrow B, and the pressures applied to both sides (that is, the gas pressure of the gas chamber 21A and the liquid pressure of the liquid chamber 21B) balance each other. Stop at the position you made. Along with this, the poppet 13 is separated from the inner end surface of the liquid inlet / outlet member 24 as shown in FIG.

When the liquid pressure of the liquid supply source increases as compared with the state shown in FIG. 3, the accumulator bladder 10 according to the present invention has the central portion 11A thereof on the gas chamber 21A side (that is, in the "intake direction"). ”) As indicated by the arrow B, and the pressures applied to both sides thereof (ie, the gas pressure in the gas chamber 21A and the liquid pressure in the liquid chamber 21B) are stopped at a position where they are balanced with each other. Along with this, the annular protrusion 11c is separated from the inner end surface of the liquid inlet / outlet member 24.

When the liquid pressure of the liquid supply source further increases, the central portion 11A of the accumulator blade 10 according to the present invention is indicated by the arrow B toward the gas chamber 21A side (that is, "intake direction"). And the pressure applied to both surfaces thereof (that is, the gas pressure in the gas chamber 21A and the liquid pressure in the liquid chamber 21B) is stopped at a position where they are balanced with each other. Along with this, the accumulator bladder 10 according to the present invention is put into an unloaded state as shown in FIG. 2, for example.

Therefore, according to the accumulator bladder 10 of the present invention , even if the central portion 11A repeats approaching and separating with respect to the liquid inlet / outlet member 24 frequently with the liquid pressure fluctuation of the liquid supply source, Since the annular ridge 11c is formed on the outer peripheral surface of the portion 11A, even when the poppet 13 is brought into contact with the inner end surface of the liquid inlet / outlet member 24, the annular ridge 11c causes a gap between the poppet 13 and the shell 21. Since the liquid can be retained in the curved reversal part 11C, excessive deformation of the curved reversal part 11C can be avoided, and the buckling stress applied to the curved reversal part 11C can be relieved, and the elastic material layer 11 and the gas shielding layer 12 are formed in the curved reversal part 11C. It is possible to suppress damage.

In other words, in the accumulator bladder 10 according to the present invention, even when the elastic material layer 11 is formed of a resin material having a small elasticity, the liquid pressure fluctuation of the liquid supply source (not shown) is changed. It is possible to secure good durability characteristics for a long period of time and to extend the service life.

(Second Embodiment)

In addition, the configuration and operation of the second embodiment of the accumulator according to the present invention will be described in detail with reference to FIGS.

The second embodiment has substantially the same configuration as that of the first embodiment except that two annular projections 31c are formed on the outer peripheral surface of the central portion 31A. .

Therefore, the second embodiment is substantially the same as the first embodiment except that the second embodiment is superior to the first embodiment in retaining liquid with the shell 41. Has the effect of.

Therefore, here, the reference numbers given to the members corresponding to the respective members included in the first embodiment by “20” are added to the reference numbers given in the first embodiment. Therefore, other detailed description will be omitted.

[0052]

[Effect of device]

 As is apparent from the above, the accumulator bladder according to the present invention is an accumulator bladder in which the inner space of the shell is divided into a gas chamber and a liquid chamber, and is clearly indicated in the [Problem solving means] column. In particular, since at least one annular protrusion is formed on the outer peripheral surface of the central portion, (i) when the central portion moves toward the liquid chamber side, the inner peripheral surface of the shell Has the effect of holding the liquid between them and (ii) at the time of moving the central part toward the liquid chamber side, at least the effect of preventing excessive deformation of the curved reversal part, (iii) It has the effect of at least relaxing the buckling stress applied to the bending reversal part and suppressing the occurrence of cracks, and as a result, (iv) when it is formed of a resin material having small elasticity. Even with durability Has the effect of extending the life of the product.

[Brief description of drawings]

FIG. 1 is a first accumulator bladder according to the present invention.
FIG. 6 is a cross-sectional view showing an embodiment of

FIG. 2 is a sectional view showing a usage state of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view for explaining the operation of the embodiment shown in FIG.

FIG. 4 is a cross-sectional view for explaining the operation of the embodiment shown in FIG.

FIG. 5 is a second accumulator bladder according to the present invention.
FIG. 6 is a cross-sectional view showing an embodiment of

FIG. 6 is a cross-sectional view showing a usage state of the embodiment shown in FIG.

FIG. 7 is a cross-sectional view for explaining the operation of the embodiment shown in FIG.

FIG. 8 is a cross-sectional view for explaining the operation of the embodiment shown in FIG.

[Explanation of symbols] 10 ; 30 ........... Bladder for accumulator 11; 31 .. ..Elastic material layer 11A; 31A ........... central part 11B; 31B ........... peripheral part 11C; 31C ...・ ・ ・ Bend inversion part 11a; 31a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Elastic mounting part 11b; 31b ・ ・ ・ ・ ・ ・Elastic protrusions 11c; 31c ・ ・ ・ ・ ・ ・ ・ ・ ・ Annular protrusions 12; 32 ・ ・ ・ ・ ・ ・ Gas shield layer 13; 33 ・・ ・ ・ ・ Poppet 20 ; 40・ ・ ・ ・ ・ ・ ・ ・ ・ Accumulator 21; 41 ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Shell 21A; 41A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gas chamber 21B; 41B ・ ・ ・ ・ ・ ・Liquid chamber 21a; 41a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Liquid inlet / outlet member mounting opening 22; 42 ・ ・ ・ ・ ・ ・ ・ Mounting member 23; 43 ・ ・・ ・ ・ Closing member 23a; 43a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gas supply port 23b; 43b ・ ・ ・ ・・ ・ ・ Seal member 24; 44 ・ ・ ・ ・ Liquid inlet / outlet member 24a; 44a ・ ・ ・ ・ ・ ・ ・ ・ ・ Liquid guide Hole

Claims (1)

[Scope of utility model registration request] 1. An accumulator bladder having an internal space of a shell partitioned into a gas chamber and a liquid chamber.
An accumulator bladder characterized in that at least one (11c; 31c) is formed on the outer peripheral surface of the central portion.