CN107542709A - hydraulic accumulator - Google Patents

Abstract

The gases at high pressure being in due course in release air chamber, and suitably control the release pressure of gases at high pressure and suppress plosive or impact.A kind of hydraulic accumulator, with shell, bellows, and self sealss support member, the self sealss support member is configured on the pressure fluid inflow entrance to liquid room opening, and the self sealss support member on the head of the main part with tubular and the lid formed with through hole, self sealss support member possesses the first frangible portion, first frangible portion can deform main part when the pressure of air chamber exceedes defined threshold value, first frangible portion is the first recess formed along the circumferencial direction of main part, the bottom surface of recess is the curved surface of plane or the arc-shaped protruded from the Inside To Outside of main part, at least one in the both ends of bottom surface in a circumferential direction is combined with the outer peripheral face of main part.

Description

Hydraulic accumulator

Technical field

The present invention relates to hydraulic accumulator, more particularly to self sealss support member possesses the hydraulic accumulator of frangible portion.

Background technology

The hydraulic accumulator stored temporarily to the liquid after boosting is used in the hydraulic circuits such as the brake circuit of automobile. Hydraulic accumulator has the liquid room that gases at high pressure are enclosed into air chamber therein and pressure fluid (working oil) is imported from hydraulic circuit. Air chamber and liquid room are oppositely disposed across flexible bellows.Stretched by bellows, the pressure of air chamber and liquid room reach balance from And suppress the fluctuation of hydraulic circuit and be adjusted to appropriate hydraulic pressure.

In the past, hydraulic accumulator, such as when automobile runs into fire etc. and is placed in for a long time under high temperature or even hyperbaric environment, The internal pressure of the air chamber of hydraulic accumulator may extremely rise.Therefore, pressure release unit is provided with hydraulic accumulator, is running into this During the anomalous event of sample, the internal pressure of air chamber is discharged.For example, with reference to patent document 1：Japanese Unexamined Patent Publication 2003-172301 publications, specially Sharp document 2：Japanese Unexamined Patent Publication 2012-237415 publications.

In patent document 1 in described hydraulic accumulator, as the pressure release unit of the internal pressure of release air chamber, configuring Being set in the side wall of support member in liquid room makes the thinning frangible portion of wall thickness (referring to 0017 section, Fig. 1).In hydraulic accumulator, When the internal pressure of air chamber excessively rises, by oppressing bellows by the internal pressure of the air chamber excessively risen to make in the internal pressure of liquid room Rise, so that frangible portion is broken.

Moreover, by being broken frangible portion, and the pressure fluid of high pressure is discharged from liquid room and reduces the pressure of liquid room, So as to intentionally make bellows damaged using the internal pressure of air chamber excessively risen and by the internal pressure of air chamber from the head formed in support member Intercommunicating pore release in portion.

In patent document 2 in described hydraulic accumulator, as the pressure release unit of the internal pressure of release air chamber, in metal The frangible portion in shape of shaping simultaneously is formed in material support member, in punch forming.Gold is made by the frangible portion in shape Category material support member buckle, more reliably release shell in liquid and gas (referring to claim 1,2,0009 sections, Fig. 2~Fig. 8).

However, in hydraulic accumulator described in patent document 1, there is following problem：When make frangible portion be broken and release During the internal pressure of venting chambers, it is broken suddenly, therefore produces plosive when being broken and give uneasy sense.Have in addition and ask as follows Topic：When being broken frangible portion, being inside pressed in extremely short moment is released, and therefore, it is difficult to carry out the pressure release of the pressure in release air chamber The adjustment of pressure.There is following problem in addition：When hydraulic accumulator is minimized, because the height of support member is relatively low, therefore just Property enhancing and be difficult to be broken.

In patent document 2 in described hydraulic accumulator, there is following problem：When strictly ensuring formed precision or wall During thick precision, the machining period of mould or adjustment man-hour increase, on the other hand, it is difficult to carry out the pressure in release air chamber The adjustment of vent pressure.

The first problem of the present invention is, the making man-hour of hydraulic accumulator is reduced by simple structure.

The second problem of the present invention is, easily carries out the adjustment of the vent pressure of pressure in release air chamber.

The 3rd problem of the present invention is that machine discharges the gases at high pressure in air chamber in due course.

The 4th problem of the present invention is, suitably controls the release pressure of gases at high pressure.

The content of the invention

The solution of the present invention is a kind of hydraulic accumulator, to have：Shell, it is internally formed air chamber and liquid room；Bellows, Elastically it is contained in the shell, and the inside is separated into the air chamber and the liquid room；Oral area, it is arranged on this On shell, and form the pressure fluid inflow entrance of oriented liquid room opening；And self sealss support member, configure in the oral area On, and the head of the main part with tubular and the lid formed with through hole, and it is connected to the top ends of the bellows On the head, the self sealss support member possesses the first frangible portion, and it is when the pressure of the air chamber exceedes defined threshold value, main body Portion can deform so that the head tilts relative to the top ends of the bellows, and first frangible portion is along the main body The first recess that the circumferencial direction in portion is formed, the bottom surface of first recess is plane or outside from the inner side of the main part The curved surface of the arc-shaped of side protrusion, at least one end and the main body in both ends of the bottom surface on the circumferencial direction The outer peripheral face in portion combines.

The hydraulic accumulator, it is fragile that the first recess formed by the circumferencial direction along the main part forms described first Portion, thus making property is good and easily carries out the management of dimensional accuracy, therefore can rightly set the pressure in release air chamber Vent pressure.

The hydraulic accumulator, by possessing the first frangible portion being made up of the first recess, so as to recessed formed with first In the range of portion, the main part of self sealss support member is easily buckled.Therefore, the pressure or temperature of the gases at high pressure in air chamber When excessively rising, it can reliably cause the generation buckled so as to the high pressure gas being in due course reliably in release air chamber Body.Especially, when hydraulic accumulator is minimized, the height step-down of self sealss support member is difficult to buckle so as to self sealss support member, It is consequently adapted to minimize hydraulic accumulator.

That is, when the pressure or temperature of the air chamber exceed defined threshold value, due to extruding the air chamber on the head Pressure, the main part of self sealss support member are buckled, and main part deform so that the head relative to the bellows top Portion tilts.Therefore, the shape that the through hole formed on the head of self sealss support member is closed from the top ends for being connected to bellows State is opened, thus can be discharged the gases at high pressure in air chamber by through hole.

In the hydraulic accumulator, the bottom surface of the first recess is formed by the curved surface of plane or circular arc, and the bottom surface is in institute At least one outer peripheral face with the main part stated in the both ends on circumferencial direction is combined, therefore on the bottom surface of the first recess The wall thickness of main part increase with least one in from central portion towards both ends.Accordingly, with respect to the circle of main part Circumferential direction, occur initially to buckle in the central portion of the first recess, initially buckled with this as the beginning, the both ends buckled to the first recess At least one direction in portion promotes.

Following characteristics are presented in the degree buckled：The flexure of main part in the axial direction is larger on the central portion of the first recess, Diminish at least one in the both ends of the first recess.

That is, in the central portion of the first recess, it is in due course after the generation for causing and buckling, to buckle to circumferencial direction The mode of diffusion extends to whole first recess, therefore from the generation buckled to end, the necessary time difference as defined in setting.Cause This, can spend the defined necessary time by through hole of the gases at high pressure in air chamber from formation on the head of self sealss support member Smoothly discharge.

The hydraulic accumulator suitably controls the release pressure of gases at high pressure, therefore will not turn into gases at high pressure are unexpected And rupture formula as instantaneously discharging discharges, so that the hair of the abnormal sound or impact when effectively suppressing the release of gases at high pressure It is raw.

So, the hydraulic accumulator, man-hour is made to reduce by simple structure.The hydraulic accumulator, easily enters The adjustment of the vent pressure of pressure in row release air chamber.The hydraulic accumulator, the high pressure being in due course in release air chamber Gas.In addition, the hydraulic accumulator suitably controls the release pressure of gases at high pressure, so as to effectively suppress releasing for gases at high pressure The generation of abnormal sound when putting etc..

The length of groove of first recess on the circumferencial direction is the substantially half of the girth of the main part.

By make first recess groove length for the girth of main part substantially half, so as to rightly setting slot Central portion on axial rigidity of support, easily buckled so as to be in due course.

First frangible portion can also possess crisp from first recess along axially extending second of the main part Weak portion.

First frangible portion, by possessing the second frangible portion, so as to rightly set the axial branch on the first recess Support rigidity, easily buckles so as to be in due course.

Hydraulic accumulator above, man-hour is made to reduce by simple structure.In addition, the hydraulic accumulator easily enters The adjustment of the vent pressure of pressure in row release air chamber.The hydraulic accumulator, in due course machine release air chamber in high pressure gas Body.The hydraulic accumulator suitably control gases at high pressure release pressure, so as to effectively suppress gases at high pressure release when Abnormal sound or the generation of impact.

Brief description of the drawings

Fig. 1 is the front section view for representing the hydraulic accumulator involved by embodiments of the present invention.

Fig. 2 is the front section view of action when representing the normal work of the hydraulic accumulator shown in Fig. 1, represents that hydraulic pressure returns The hydraulic pressure on road reduces and state that pressure fluid inflow entrance is closed.

Fig. 3 A~3C represent the self sealss support member shown in Fig. 1, and Fig. 3 A are the plan cross-sections along Fig. 3 C IIIA-IIIA lines Figure, it along the front section view of Fig. 3 C IIIB-IIIB lines, Fig. 3 C is stereogram that Fig. 3 B, which are,.

Fig. 4 A, 4B are the figures for the first variation for representing the self sealss support member shown in Fig. 1, and Fig. 4 A are stereograms, and Fig. 4 B are Along the section plan of Fig. 4 A IVB-IVB lines.

Fig. 5 A~5C are the figures of the embodiment 1 for the second variation for representing the self sealss support member shown in Fig. 1, and Fig. 5 A are main views Figure, it along the sectional view of Fig. 5 A VB-VB lines, Fig. 5 C is stereogram that Fig. 5 B, which are,.

Fig. 6 A~6C are the figures of the embodiment 2 for the second variation for representing the self sealss support member shown in Fig. 1, and Fig. 6 A are main views Figure, it along the sectional view of Fig. 6 A VIB-VIB lines, Fig. 6 C is stereogram that Fig. 6 B, which are,.

Fig. 7 is the front section view of action when representing the non-normal working of the hydraulic accumulator shown in Fig. 1, in running into Fire etc. and cause the pressure of air chamber and temperature to rise the starting stage being closed so as to pressure fluid inflow entrance.

Fig. 8 is the front section view of action when representing the non-normal working of the hydraulic accumulator shown in Fig. 1, in air chamber Temperature or air pressure it is further up and reach defined threshold value, the state that self sealss support member is buckled.

Fig. 9 is that the front of the action of hydraulic accumulator when representing the non-normal working of the hydraulic accumulator shown in Fig. 1 is cutd open View, the pressure in the second liquid room reduce and the state of bellows breakage.

Figure 10 is that the gases at high pressure in air chamber when representing the non-normal working of the hydraulic accumulator shown in Fig. 1 are released The front section view of situation.

Figure 11 A~11C are the stereograms for the 3rd variation for representing the self sealss support member shown in Fig. 1, and Figure 11 A are self sealss The example of the longer form of the axial length of support member, the auxiliary frangible portion that Figure 11 B are Figure 11 A are located on the position on head Form, Figure 11 C be Figure 11 A auxiliary frangible portion be located at close to bottom position on form.

Figure 12 is the front cross-sectional for representing the hydraulic accumulator involved by the 4th variation of the hydraulic accumulator shown in Fig. 1 Figure.

The explanation of reference：

1st, 1F hydraulic accumulators

2 shells

3 air chambers

4 liquid rooms

5 bellowss

6 oral areas

8 self sealss support members

8A, 8B, 8C, 8D, 8E self sealss support member

8a main parts

8b heads

9 frangible portions

21 main parts

21a bottoms

22 cover plates

22a gases enclose mouth

31 first air chambers (air chamber)

32 second air chambers (air chamber)

41 first liquid rooms (liquid room)

42 second liquid rooms (liquid room)

50 pars contractilis

51 top ends

52 bellows guide blocks

53 seals

61 pressure fluid inflow entrances

81 through holes

91 recesses

91B recesses

91a, 91aB side of sidewall portion

91b, 91bB bottom surface

91c, 91cB both ends

92 auxiliary frangible portions

92B, 92D, 92E aid in frangible portion

G gases at high pressure

Q pressure fluids

T1 wall thickness

T2 wall thickness

Embodiment

For the composition of the hydraulic accumulator 1 involved by embodiments of the present invention, suitably carried out referring to figs. 1 to Fig. 5 C detailed Describe in detail bright.

As shown in figure 1, hydraulic accumulator 1 possesses：Shell 2, is made up of pressure vessel；Air chamber 3 and liquid room 4, the shape of air chamber 3 Into in the inside of shell 2, and gases at high pressure G is sealed with, the liquid room 4 imports pressure from hydraulic circuits such as unshowned brake circuits Liquid Q；Bellows 5, it is elastically contained in shell 2；The oral area 6 of shell 2, it forms the pressure that oriented liquid room 4 is open Power liquid inflow port 61；And self sealss support member 8, it is configured in liquid room 4 to cover oral area 6.

Bellows 5 be to be formed air chamber 3 and liquid room 4 border and spacing part.Bellows 5 possesses：Snake abdomen shape Pars contractilis 50, be fixed on pars contractilis 50 the top ends 51 on top, the ripple of the sliding freely block shape in support telescopic portion 50 Line pipe guide block 52 and configuration top ends 51 (Fig. 1 lower face side) seal 53.

Self sealss support member 8 forms the relatively low hat shape of the height being made up of the main part 8a of tubular and the head 8b of lid.From Sealing support member 8 possesses the through hole 81 to be formed on head 8b central part and forms the frangible portion 9 on main part 8a.

There are self sealss support member 8 top ends 51 for making bellows 5 to be connected on the 8b of head to limit the extension of air chamber 3 appearance Accumulate and support bellows 5 so that the function that bellows 5 will not be overly compressed.

In the hydraulic accumulator 1 of this structure, when bellows 5 shrinks, seal 53 closes the logical of self sealss support member 8 Hole 81.In addition, in possessing the self sealss support member 8 of frangible portion 9, when the pressure of air chamber 3 exceedes defined threshold value, due to air chamber 3 pressure and by main part 8a deform conquassation so that head 8b tilts relative to the top ends 51 of bellows 5.

In the following description, action of the hydraulic accumulator 1 in expected actuating range is referred to as " during normal work Action " (Fig. 1 and Fig. 2).For ease of illustration and with being distinguished during normal work, by made due to fire etc. air chamber 3 pressure or Authorized pressure (the pressure in actuating range pre-estimated when excessive temperature rises, compares normal work so as to the pressure of air chamber 3 Power) excessively rise when operating state be referred to as " action during non-normal working " (Fig. 7 to Figure 10).

Action ＞ during ＜ normal works

Flexible by bellows 5 in hydraulic accumulator 1, the pressure of air chamber 3 and liquid room 4 reaches balance so as to suppress to make The fluctuations of hydraulic circuit (not shown) such as dynamic loop are simultaneously adjusted to appropriate hydraulic pressure.

In addition, as shown in Fig. 2 in the hydraulic pressure reduction of hydraulic circuit (not shown), the pressure so as to relative to air chamber 3, liquid When the pressure of room 4 is less than authorized pressure set in advance, seal 53 is set to be connected on the head 8b of self sealss support member 8 with by shape Closed into the through hole 81 on the head 8b of self sealss support member 8, prevent the reduction of the hydraulic pressure of hydraulic circuit (not shown).

＜ shells ＞

As shown in figure 1, shell 2 is the pressure vessel of closed structure.Shell 2 possesses：By the drum with bottom 21a The gas of the main part 21 of composition, the cover plate 22 being welded on the openend of main part 21 and configuration on cover plate 22 is enclosed Mouth 22a.

In addition, in a part of part in present embodiment, use as " bottom 21a " and " meaned cover plate 22 " The term of upper and lower relation, but this is only to facilitate explanation, it is meant that the position relationship in figure, and be not to occupation mode In the meaning that is defined of position relationship.

＜ air chambers ＞

Air chamber 3 is the space mainly surrounded by the main part 21 of bellows 5, cover plate 22, shell 2.Air chamber 3 is relative to shell 2 axial direction and formed in the Side of cover plate 22 1 (relative to the opposite end side of oral area 6), enclose mouth 22a from gas and enclose high pressure Gas G.Air chamber 3 possesses：Formed in the first air chamber 31 of the top of bellows 5 and formation in the periphery wall side of bellows 5 Second air chamber 32 in (using the perisporium of bellows 5 as border, in the outside of perisporium).Due to the first air chamber 31 and the second air chamber 32 Connection, therefore there is identical pressure.

＜ liquid room ＞

As shown in Fig. 2 liquid room 4 possesses：Formed in the state of the through hole 81 of self sealss support member 8 is closed and supportted in self sealss First liquid room 41 of the inner side (side of pressure fluid inflow entrance 61) of part 8 and formed in the outside of self sealss support member 8 (with ripple The perisporium of line pipe 5 as border, in the inner side of perisporium) the second liquid room 42.

First liquid room 41 is mainly by the inner side of the bottom 21a of self sealss support member 8, shell 2 self sealss support members 8 surrounded Region.Second liquid room 42 is the region that is mainly clipped by the internal perisporium of bellows 5 and the outside of self sealss support member 8.

As shown in figure 1, in the first liquid room 41, from the hydraulic circuits such as brake circuit (not shown) by being formed in oral area 6 On pressure fluid inflow entrance 61 import pressure fluid Q (working oil), until by formed block shape bellows guide block 52 The gap on both sides pressure fluid Q is full of in the second liquid room 42.

Therefore, in normal work, in the state of the through hole 81 of self sealss support member 8 is not closed, the first liquid room 41 Connected with the second liquid room 42 by through hole 81, therefore respective pressure is identical.

On the other hand, in the state of the through hole 81 of self sealss support member 8 is closed, as shown in Fig. 2 the limitation of seal 53 the One liquid room 41 connects with the second liquid room 42, therefore the first liquid room 41 connects with hydraulic circuit (not shown), and the second liquid room 42 As independent confined chamber.

Therefore, in normal work, the pressure even in hydraulic circuit (not shown) reduces and makes the pressure of the first liquid room 41 In the case that power falls below the pressure of air chamber 3, be also able to maintain that the pressure of the second liquid room 42, thus the pressure of air chamber 3 and The pressure of second liquid room 42 reaches balance so as to prevent the damage of bellows 5.

＜ bellowss ＞

The pars contractilis 50 of bellows 5 is the toroidal for forming snake abdomen shape and the internal extensible member for turning into cavity.It is flexible Portion 50 is the metal part for the internal pressure that can bear gases at high pressure G.One end (Fig. 1 lower end) of pars contractilis 50 is close to shell 2 Bottom 21a on and airtightly fix, the other end (Fig. 1 upper end) is close in top ends 51 and fixed, so that inner side turns into It is airtight.

The top ends 51 of bellows 5 are the disc-shaped part for sealing the head opening portion of bellows 5, can also be by so-called Ripple pipe cap form.

What bellows 5 was stretched in the axial direction with the top due to inclosure bellows 5 and the air pressure of the air chamber 3 of periphery wall side Mode works, and the work in a manner of due to being shunk from the hydraulic pressure of the hydraulic circuit internal perisporium side (not shown) for importing bellows 5 Make.Thus, bellows 5 stretches so that air pressure and hydraulic pressure balance each other, so as to suppress the fluctuation of hydraulic circuit (not shown), and will press Power liquid is adjusted to defined hydraulic pressure.

Bellows guide block 52 is slide unit of the section in L-shaped, reduction frictional resistance block shape, installed in fixation On peripheral end in the top ends 51 of pars contractilis 50.To allow bellows 5 successfully to stretch and making the first air chamber 31 Connected with the second air chamber 32, the circumference equal dividing of bellows guide block 52 and be suitably provided with gap and be configured at 2~4 positions.

＜ seal members ＞

To improve air-tightness during normal work, seal 53 is using elastomeric elements such as rubber.In addition, in non-normal working When excessive high-temperature high-pressure state under, seal 53 can melt or even be carbonized and loss of seal, but be not particularly limited.

＜ oral areas ＞

Oral area 6 is to include the position around the pressure fluid inflow entrance 61 that is integrally formed with the bottom 21a of shell 2.Mouthful Portion 6 possesses：The main part 62 of hydraulic circuit (not shown) is connected to and through main part by pipe arrangement (not shown) or joint 62 and the bottom 21a and the pressure fluid path 61a that is connected with pressure fluid inflow entrance 61 of shell 2.

In addition, from the viewpoint such as rigidity and air-tightness, the oral area 6 of oral area of shell 2 is formed relative to 2 integral structure of shell Into, but it is not limited to this.Can also with processability isopreference, using relative to shell 2 as independent individual oral area part (not Diagram) it is fixed on shell 2 and forms.When being formed as independent individual, by weld etc. fixing means ensure air-tightness and Oral area part is fixed on shell 2.

＜ self sealss support members ＞

As shown in fig.3 a 3 c, self sealss support member 8 possesses the frangible portion 9 (the first frangible portion) of thin-walled on main part 8a. Self sealss support member 8 passes through squeeze bulb 8b air chamber 3 or extruding main part 62 when the pressure of air chamber 3 exceedes defined threshold value The second liquid room 42 pressure and by the main part 8a conquassation of frangible portion 9.When main part 8a is due to frangible portion 9 and by conquassation, Head 8b tilts relative to the top ends 51 of bellows 5.Therefore, the quilt of through hole 81 formed on the head 8b of self sealss support member 8 Open.

＜ frangible portions ＞

Frangible portion 9 possesses：Be formed as along main part 8a circumferencial direction the channel-shaped of main frangible portion recess 91 and The auxiliary frangible portion 92 (the second frangible portion) being further made up of counterbore shape.

The recess 91 (the first recess) of channel-shaped is, in the main part 8a bar formed relative to short transverse substantially central portion The groove of shape, the length δ (reference picture 3A) of the groove on main part 8a circumferencial direction are main part 8a girth (length of complete cycle) Substantially half length.Should " substantially length of half " mean including the length of half, be slightly longer than half long Degree and the length more slightly shorter than half.

Pass through such structure, it is ensured that the length δ of groove is the substantially half of main part 8a girth, so as to rightly set Axial rigidity of support on the central portion of groove, easily buckled so as to be in due course.

The recess 91 of channel-shaped possesses：Paired side of sidewall portion 91a, 91a and formation are in side of sidewall portion in a manner of facing Bottom surface 91b between 91a, 91a.

The bottom surface 91b of recess 91 is the curved surface for the arc-shaped protruded from main part 8a Inside To Outside, and bottom surface 91b is in circle Both ends 91c in circumferential direction extends or reaches to main part 8a outer peripheral face.

Therefore, at the 91c of both ends, outer peripheral face is not with having the platform on wall thickness direction on the bottom surface 91b of recess 91 border Rank, bottom surface 91b are smoothly merged or combined with main part 8a outer peripheral face.That is, both ends 91c and main part 8a outer peripheral face phase Continuously.

The bottom surface 91b of the recess 91 curved surface is more than the outer peripheral face of the main part 8a in radius of curvature.In addition, Can be that at least one end in the both ends 91c of bottom surface 91b in a circumferential direction is combined with main part 8a outer peripheral face.

By such structure, at the central portion on the circumferencial direction of recess 91, main part 8a wall thickness t1 is smaller, At the both ends 91c of recess 91, wall thickness t2 becomes larger compared to central portion, is changed into the wall with main part 8a at the 91c of both ends It is thick identical.

Auxiliary frangible portion 92 be, with the recess 91 with channel-shaped overlap from recess 91 along main part 8a peripheral part in axial direction The recess that the mode of upper extension is formed.Specifically, relative to the recess 91 of channel-shaped, auxiliary frangible portion 92 be in circumferencial direction and The counterbore shape with the end that the central portion of axial direction is formed.As shown in Figure 3A, in counterbore shape auxiliary frangible portion 92 bottom surface center The wall thickness in portion is t1 (reference picture 3B).

The first variations of ＜ ＞

In addition, in the present embodiment, frangible portion 9 is not by main frangible portion and auxiliary two kinds of morphosises of frangible portion This is defined in, can also be the recess 91 (reference picture 4A, 4B) of the i.e. channel-shaped of main frangible portion.

As shown in Fig. 4 A, 4B, the self sealss support member 8A involved by the first variation the, relative to (reference picture of self sealss support member 8 3A~3C), it is different without auxiliary frangible portion 92 (reference picture 3A~3C) on this point, and other structures are identical, therefore save The explanation slightly repeated.

Whether setting auxiliary frangible portion 92 is to consider the shape of self sealss support member or setting pressure etc. of air chamber 3 and suitably determine Fixed, and frangible portion 92 is aided in by setting, so as to more rightly set the axial rigidity of support on the recess 91 of channel-shaped, Easily buckled so as to be in due course.

The second variations of ＜ ＞

In the present embodiment, the bottom surface 91b of the recess 91 of channel-shaped is formed with the curved surface of arc-shaped, but is not limited to This.As shown in Fig. 5 A~5C and Fig. 6 A~6C, man-hour is made in order to reduce, bottom surface may not be curved surface but plane.

As shown in Fig. 5 A~5C, in the self sealss support member 8B involved by the embodiment 1 in the second variation, the recess of channel-shaped 91B possesses：Paired side of sidewall portion 91aB, 91aB and formation are flat between side of sidewall portion 91aB, 91aB in a manner of facing The bottom surface 91bB in face.Due to identical with aiding in frangible portion 92B structure, therefore omit detailed description.

In addition, in self sealss support member 8B involved by embodiment 1 in the second variation, it is configured to possess auxiliary frangible portion 92B, but can also be that the self sealss support member 8B1 involved by the embodiment 2 of the second variation as shown in figs. 6 a-6 c is such, It is not provided with aiding in frangible portion 92B.

Self sealss support member 8B1 involved by the embodiment 2 of second variation, relative to the institute of embodiment 1 of the second variation The self sealss support member 8B being related to, it is being not provided with aiding in frangible portion 92B different on this point, and other structures are identical, therefore, for Identical structure, it is marked with identical mark and the repetitive description thereof will be omitted.

As shown in Fig. 5 B and Fig. 6 B, recess 91B bottom surface 91bB is, when overlooking relative to the orthogonal direction of radial direction The plane of upper formation, the both ends 91cB of bottom surface 91bB in a circumferential direction extend or reach to main part 8a outer peripheral face.Cause This, at the 91cB of both ends, outer peripheral face is not with having the step on wall thickness direction, bottom surface on recess 91B bottom surface 91bB border 91bB is smoothly merged or combined with main part 8a outer peripheral face.That is, the outer peripheral face of both ends 91cB and main part 8a are mutually continuous.

By such structure, at the central portion of recess 91B in a circumferential direction, main part 8a wall thickness t1 is smaller, At recess 91B both ends 91cB, wall thickness t2 becomes larger compared to central portion, is changed at the 91cB of both ends and main part 8a Wall thickness it is identical.

Action ＞ during ＜ non-normal workings

On the hydraulic accumulator 1 involved by the embodiments of the present invention that form as described above, (in addition to first become Shape example, the second variation) non-normal working when action, 7~Figure 10 of reference picture illustrates.

[pressure fluid entrance is closed because temperature rises]

In the non-normal working of hydraulic accumulator 1, as shown in fig. 7, work as makes air chamber 3 in the starting stage due to fire etc. Pressure or temperature rise when, lower section from bellows 5 to Fig. 7 shrink.

When seal 53 of the configuration on the lower surface of the top ends 51 of bellows 5 is connected to the head of self sealss support member 8 When on 8b, the through hole 81 that seal 53 will be formed on the head 8b of self sealss support member 8 is closed, pressure fluid inflow entrance 61 also into For closed state.Now, the pressure of the hydraulic circuit (not shown) such as the first liquid room 41 and unshowned brake circuit is identical, and Two liquid rooms 42 are in by closed state.

[frangible portion is buckled by conquassation]

When since the starting stage, the pressure of air chamber 3 or temperature are further up, reach advance so as to the pressure of air chamber 3 During the defined threshold value of setting, as shown in figure 8, the frangible portion 9 of self sealss support member 8 is buckled so as to main part 8a by conquassation. In other words, frangible portion 9 is designed to, and when the pressure of air chamber 3 reaches defined threshold value set in advance, frangible portion 9 is by conquassation So as to which main part 8a buckles.Now, frangible portion 9 adjoint may also can buckle and be broken.

[pressure of the second liquid room reduces]

When frangible portion 9 is buckled by conquassation so as to main part 8a, through hole 81 is opened.By the second closed liquid room 42 Pressure fluid Q is flowed out by through hole 81 to the first liquid room 41, therefore the pressure of the second liquid room 42 reduces.In addition, produced in frangible portion 9 In the case of having given birth to breaking portion, pressure fluid Q also flows out from there.

[breakage of bellows]

When the pressure of the second liquid room 42 reduces, as shown in figure 9, the pressure of air chamber 3 is more than the pressure in the second liquid room 42. Therefore, because from the periphery wall side of bellows 5 towards the pressure of the air chamber 3 of pressure fluid inflow entrance 61, and make bellows 5 broken Damage, so as to be connected from second the 32 to the second liquid of air chamber room 42 and the first liquid room 41.

When the second air chamber 32 connects with the second liquid room 42 and the first liquid room 41, due to the gases at high pressure in the first air chamber 31 G pressure, the pressure fluid Q in the first liquid room 41 and the second liquid room 42 flow out from pressure fluid inflow entrance 61.As shown in Figure 10, Gases at high pressure G in first air chamber 31 is flowed out from the second air chamber 32 by the second liquid room 42 and the first liquid room 41, therefore air chamber 3 Gases at high pressure G pressure reduces.

Hydraulic accumulator 1 involved by the embodiment formed as described above plays following such action effect.

Hydraulic accumulator 1, by being provided with frangible portion 9, easily buckled so as to the main part 8a of self sealss support member 8, Therefore the generation buckled reliably is caused so as to the gases at high pressure G being in due course in release air chamber 3.Therefore, for master Body portion 8a diameter is particularly suitable compared to hydraulic accumulator 1 (reference picture 3C) that is highly relatively low and being difficult to buckle.

Hydraulic accumulator 1, by setting frangible portion 9, so as in the central portion of the recess 91 (reference picture 3A~3C) of channel-shaped Generation is initially buckled, and is initially buckled with this as the beginning, and the both ends 91c for the recess 91 buckled to channel-shaped direction promotes, so as to The scope buckled is expanded.

That is, channel-shaped recess 91 central portion, be in due course after the generation for causing and buckling, to buckle to circumference The mode of direction diffusion extends to whole first recess, therefore from the generation buckled to end, although the small necessary rule of setting The fixed time difference.Therefore, it is possible to spend the defined necessary time to support the gases at high pressure G in air chamber 3 in self sealss from formation Through hole 81 on the head 8b of part 8 smoothly discharges.

So as to which hydraulic accumulator 1 can suitably control gases at high pressure G release pressure, therefore will not turn into high pressure Gas is suddenly and instantaneously rupture formula as discharge discharges, so as to effectively suppress the generation of plosive or impact.

In addition, in the present embodiment, for convenience of description, and each action of hydraulic accumulator 1 is easy-to-understand to and torn open Point, after illustrating the pressure fluid Q discharges in by liquid room 4, the gases at high pressure G in air chamber 3 is released by liquid room 4. On the other hand, actually each action is carried out in a manner of carry out simultaneously, if for example, the hydraulic pressure in liquid room 4 fully reduces State, then gases at high pressure G in the pressure fluid Q in liquid room 4 by promptly discharging.

Embodiments of the present invention are illustrated above, but the present invention is not limited to above-mentioned embodiment, can Suitably deformed and implemented.For example, as shown in Figure 3 C, in the present embodiment, self sealss support member 8 is configured to be formed and master Body portion 8a diameter compares highly less low hat shape, but is not limited to this.The buckling load buckled can be according to crisp The shape in weak portion 9 is suitably set, therefore the self sealss support member 8C involved by the 3rd variation as shown in Figure 11 A is such, right It can also be applied in the self sealss support member 8C of height and main part 8a diameter identical degree.

In addition, in the present embodiment shown in Fig. 3 C, relative to the recess 91 of channel-shaped, auxiliary frangible portion 92 is formed On the central portion of axial direction, but it is not limited to this.Can also be, self sealss support member 8D as shown in Figure 11 B like that, by counterbore shape Auxiliary frangible portion be formed as relative to recess 91 from center upward, or, self sealss support member 8E as shown in Figure 11 C that Sample, from center downward.

By such structure, will auxiliary frangible portion 92D be formed as relative to recess 91 from center upward when (ginseng According to Figure 11 B), reduce the buckling load based on auxiliary frangible portion 92D and cause buckle earlier.In addition, frangible portion will aided in 92E be formed as relative to recess 91 from center downward when (reference picture 11C), improve and being buckled based on auxiliary frangible portion 92E Load and more lingeringly cause and buckle.

In addition, in the present embodiment shown in Fig. 1, one end of bellows 5 is fixedly arranged on the 21a of bottom, but not It is defined in such structure.As shown in figure 12, bellows 5 can also be configured in the side of cover plate 22.In the 4th shown in Figure 12 In hydraulic accumulator 1F involved by variation, bellows 5F configuration is different, and other structures and action and hydraulic accumulator 1 (reference picture 1) is identical, therefore omits detailed description.

In addition, in the self sealss support member 8 shown in Fig. 3 A~3C, through hole 81 is formed on head 8b central part, but It is not limited to this.Through hole 81 can also to deviate head 8b central part and in a manner of auxiliary frangible portion 92 side, match somebody with somebody It is placed near the central portion of the recess 91 of channel-shaped in a circumferential direction.

By such structure, by buckling load be set to it is lower buckled so as to cause earlier, and more successfully promote Enter the outflow of the gases at high pressure G from through hole 81.

Claims (7)

1. a kind of hydraulic accumulator, has：

Shell, it is internally formed air chamber and liquid room；

Bellows, the shell is elastically contained in, and the inside is separated into the air chamber and the liquid room；

Oral area, it is arranged on the shell, and forms the pressure fluid inflow entrance of oriented liquid room opening；And

Self sealss support member, configure on the oral area, and the head of the main part with tubular and the lid formed with through hole, and The top ends of the bellows are made to be connected on the head,

The self sealss support member possesses the first frangible portion, and it is when the pressure of the air chamber exceedes defined threshold value, main part energy It is enough to deform so that the head tilts relative to the top ends of the bellows,

First frangible portion is the first recess formed along the circumferencial direction of the main part,

The bottom surface of first recess is the curved surface of plane or the arc-shaped protruded from the Inside To Outside of the main part, should At least one end in both ends of the bottom surface on the circumferencial direction is combined with the outer peripheral face of the main part.

2. hydraulic accumulator as claimed in claim 1, the first recess of first frangible portion is on the circumferencial direction The length of groove is the substantially half of the girth of the main part.

3. hydraulic accumulator as claimed in claim 1, first frangible portion possesses from first recess along the main body The second axially extending frangible portion in portion.

4. hydraulic accumulator as claimed in claim 3, second frangible portion is to be formed on the outer peripheral face of the main part The second recess.

5. hydraulic accumulator as claimed in claim 1, the wall thickness of the main part on the bottom surface of first recess with Increase from the central portion of first recess towards at least one end of the bottom surface.

6. hydraulic accumulator as claimed in claim 1, the bottom surface of first recess is more than the main body in radius of curvature The outer peripheral face in portion.

7. hydraulic accumulator as claimed in claim 1, at least one and institute in the both ends of the bottom surface of first recess The outer peripheral face for stating main part is mutually continuous.