CN101031726A - Variable volume container - Google Patents

Variable volume container Download PDF

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Publication number
CN101031726A
CN101031726A CNA2005800330212A CN200580033021A CN101031726A CN 101031726 A CN101031726 A CN 101031726A CN A2005800330212 A CNA2005800330212 A CN A2005800330212A CN 200580033021 A CN200580033021 A CN 200580033021A CN 101031726 A CN101031726 A CN 101031726A
Authority
CN
China
Prior art keywords
variable volume
radius
volume container
wall portion
flexible tube
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.)
Pending
Application number
CNA2005800330212A
Other languages
Chinese (zh)
Inventor
G·A·豪恩霍斯特
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.)
Eaton Corp
Original Assignee
Eaton Corp
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
Application filed by Eaton Corp filed Critical Eaton Corp
Publication of CN101031726A publication Critical patent/CN101031726A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/062—Details, component parts
    • 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
    • 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
    • F15B2201/21—Accumulator cushioning means using springs

Abstract

A variable volume container (30) is provided that includes a flexible tube (32) having a wall (34) that defines a variable volume chamber (36). The tube wall (34) includes a pair of generally curved end wall portions (38) and a pair of generally flat intermediate wall portions (40) separated from the end wall portions (38) by a transition wall portion (42). The generally flat intermediate wall portions (40) are spaced-apart in a neutral state. A method of making a variable volume container (30) is also provided.

Description

Variable volume container
Technical field
The present invention relates to the variable volume container of a kind of multiple hydraulic driving system that is applicable to---including, but not limited to circulating liquid pressing system---.
Background technique
The power steering system that traditional circulating liquid pressing system for example is used for motor vehicle comprises cistern, and this cistern provides fluid via the low pressure feed liquid hose to oil hydraulic pump.The oil hydraulic pump convection cell pressurizes and by the high pressure hose assembly it is supplied to for example steering rack of actuator.The fluid of discharging from actuator returns cistern via low pressure return line.
In the circulating liquid pressing system, cistern plays multiple effect.It provides a kind of durable device of filling fresh fluid to system.It also keeps the surplus fluid by the generation of the heat exchange in the volume of hydraulic fluid, and the approach of air is provided the fluid that provides a kind of permission to retain in cistern.But it usually is not satisfied using cistern, and this is because cistern occupies relatively large space and must use relatively large fluid.
In order to overcome these defectives, developed and be provided with for example circulating liquid pressing system of inflatable hose of variable volume container, this variable volume container is communicated with the low pressure return line fluid so that limit the volume buffer that the volume of hydraulic fluid in the regulating system increases and reduces.Variable volume container has replaced traditional cistern.
Except other demand, variable volume container should easily expand can not generate excessive back pressure to increase its volume in fluid.Selected structure of container also should have good memory/recovery capability, and promptly container trends towards returning its original shape after expanding, so that more stable liquid level is provided when hydraulic system is colder.On the other hand, if the volume of intrasystem hydraulic fluid reduces, perhaps extract fluid out so that satisfy the interim demand of oil hydraulic pump from variable volume container, then variable volume container need inwardly subside.Preferably, after variable volume container subsides fully, should keep at least one passage to keep fluid passage by this container.This passage allows fluid to enter and make tube swelling once more, and keeps the passage that will therefrom pass through from the air that air separator is overflowed.Usually use to have ellipse or be as general as flat container profile and attempt satisfying these requirements with elongated cross section.
There are many defectives in the variable volume container that uses in the circulating liquid pressing system at present, being included in to be difficult to return their original shape after expanding, and trending towards subsiding fully under vacuum and not have the fluid passage of generation by container.Therefore, need a kind of improved variable volume container that overcomes the defective of described prior art.
Summary of the invention
A kind of variable volume container is provided, and this container comprises the flexible pipe with the wall that limits variable volume chambers.In one embodiment, tube wall comprises a pair of end wall portion and a pair of smooth generally intermediate wall portion that is as general as arc, and this intermediate wall portion separates by transition wall and this end wall portion.Smooth generally intermediate wall portion is spaced from each other under neutral state.A kind of method of making variable volume container also is provided.
Description of drawings
By example embodiments of the invention are described below with reference to accompanying drawings, wherein:
Fig. 1 is the perspective view of the variable volume container of prior art;
Fig. 2 is the viewgraph of cross-section of variable volume container of prior art that is in Fig. 1 of neutral state;
Fig. 3 is the viewgraph of cross-section of variable volume container of prior art that is in Fig. 2 of swelling state;
Fig. 4 is the perspective view of variable volume container according to an embodiment of the invention;
Fig. 5 is the viewgraph of cross-section of variable volume container that is in Fig. 4 of neutral state;
Fig. 6 is the viewgraph of cross-section of variable volume container that is in Fig. 4 of swelling state; And
Fig. 7 coats (to apply, apply) viewgraph of cross-section of the variable volume container of the Fig. 4 on axle during manufacture.
Embodiment
Referring now to accompanying drawing, shown in Fig. 1-3 according to the variable volume container 20 of prior art.Container 20 comprises elongate tubular section 22, and this tubular part has the opposing sidewalls 24 and the opposite end walls 26 of delimit chamber 28.Tubular part 22 by elastic material for example rubber make, this make its can be respectively according to the pressure in the chamber 28 or vacuum radially outwards and curve inwardly.
The viewgraph of cross-section of the container 20 shown in Fig. 2 is illustrated in without any pressure or vacuum and puts on the container 20 that is in neutral state under the situation of tubular part 22.On the contrary, the viewgraph of cross-section of the container 20 shown in Fig. 3 is interior illustrates the chamber 28 that is under the pressure, and this pressure forces tubular part 22 radially outwards to expand and the volume of chamber 28 increases.Under pressure, tubular part 22 is through strained.Although a big chunk of tubular part 22 can be through strained under pressure, the zone of standing especially high-caliber strain of tubular part is by near 29 indications of the arrow the opposite end walls 26.These zones of standing improved strain have the tendency of destroying the material in the tubular part 22 just.This destroys and especially causes elastic loss, the memory of this elastic loss meeting infringement tubular part 22.Higher strain 29 also can form crackle in end wall 26, this can cause container 20 to break down under pressure.
Narrow limitation for the container 20 that overcomes prior art has provided variable volume container 30 according to an embodiment of the invention in Fig. 4-6.In the embodiment shown, container 30 comprises flexible pipe 32, and this flexible pipe has the wall 34 that limits variable volume chambers 36.As shown in Figure 5, tube wall 34 comprises a pair of end wall portion 38 and a pair of smooth generally intermediate wall portion 40 that is as general as arc, and this intermediate wall portion separates by transition wall 42 and end wall portion 38.When not having pressure or vacuum to put on flexible pipe 32, described smooth generally intermediate wall portion 40 is spaced apart under neutral state, and buckle when described intermediate wall portion when container 30 is exerted pressure, this pressure causes intermediate wall portion 40 outwardly-bent under the situation of exceedingly not straining the flexible pipe material.
Also as shown in Figure 5, the height H of next-door neighbour's intermediate wall portion 40 of variable volume container 30 2Height H less than next-door neighbour's end wall portion 38 of variable volume container 30 1, H 3This feature makes tube wall 34 and chamber 36 have the profile that is as general as dog bone shape under neutral state.When such structure, variable volume chambers 36 comprises a pair of spherical end portion cavity 44 and the middle cavity 46 that is as general as described two end portion cavity 44 of being connected of rectangle under neutral state of being as general as.Even when flexible pipe 32 applies vacuum---thereby this can cause intermediate wall portion 40 to be pulled together closed middle cavity 46, and end portion cavity 44 still stays open.Although the height H of next-door neighbour's end wall portion 38 of variable volume container 30 1, H 3Be depicted as equal substantially, but container 30 and need not be confined to shown structure.
Still with reference to Fig. 5, end wall portion 38 is by first radius R 1Limit, transition wall 42 is by second radius R 2Limit.Flexible tube wall 34 comprises the internal surface 48 that limits variable volume chambers 36.In one embodiment, first radius R 1Be included in the radius of the internal surface 48 in the end wall portion 38 of flexible tube wall 34, second radius R 2Be included in the radius of the internal surface 48 in the transition wall 42 of flexible tube wall 34.When such structure, first radius R 1Usually less than second radius R 2For example in the embodiment shown, second radius R 2Length be approximately first radius R 1The twice of length; But the length of described radius is not limited thereto.
The transition wall 42 that is cut into fillet cooperates with the end wall portion 38 of arc so that the aggregate elastic strain maximum on the flexible pipe 32 between the phase of expansion reduces the localized elastic strain in the tube wall simultaneously.Transition wall 38 also cooperates the surface area that stands the flexible pipe 32 of elastic strain between the phase of expansion to increase with intermediate wall portion.As a result, especially compared with prior art, elastic strain more is evenly distributed on the cross section of flexible pipe 32.For example as shown in Figure 6, the elastic strain of higher level is dispersed on the outer surface 50 of next-door neighbour's transition wall 42 of flexible pipe 32 (by arrow 52 indications), rather than resembles and concentrate on the internal surface of end wall portion 38 container 20 of prior art.Except other benefit, more uniform distribution of elastic strain reduces and even has eliminated the concentrated area of improved strain, for example among Fig. 3 by the strain zone of arrow 29 indication, this zone can form crackle or damage the elasticity of flexible pipe material flexible pipe 32 in.
Flexible pipe 32 can be made including, but not limited to acrylonitrile and chlorinated-polyethylene based rubber compounds by multiple elastic material.Supposing that they can be resisted breaks and trend towards returning their original shape after repeatedly expanding and shrinking circulation, and the elastic material that then has good recovery is particularly useful for flexible pipe 32.The thickness of flexible pipe material especially is optimized to the pressure minimum that makes container 30 complete expansions required usually, prevent that container 30 is owing to the weight of the fluid in the container expands, keep within the acceptable range in 32 phase of expansion of flexible pipe chien shih elastic strain, and reach the bursting strength of desired container 30.For example in one embodiment of the invention, the thickness of flexible pipe 32 is approximately 2.9mm (0.114 inch); But except other factor, employed final thickness also depends on the size of variable volume chambers 36 in the specific implementations of the present invention, the physical property of the material that uses in the cracking pressure of the container 30 of expectation and the container 30.
With reference to Fig. 7, with a kind of method of making variable volume container according to an embodiment of the invention of explanation.In the embodiment shown, variable volume container 30 uses totally and makes as the axle 54 of dog bone shape, and this axle comprises a pair of balled end 56 with first and second thickness T 1, T2, between described two balled end 56 and have less than the smooth generally intermediate portion 58 of the thickness T 3 of described first and second thickness T 1, T2 and the transition portion 60 that described balled end 56 is connected to described intermediate portion 58.Each thickness T 1-T3 is proportional with height H 1-H3 respectively usually.One section flexible pipe material package is overlayed on the axle 54, form the variable volume container 30 with variable volume chambers 36, the size of this variable volume chambers and shape correspond essentially to this flexible pipe material package and cover thereon axle 54.
Before or after being coated on flexible pipe 32 on the axle 54, can on flexible pipe, coat additional material layer, for example optionally weave reinforced layer 62 or flexible polymer cover 64.For the container design that comprises additional layer, the overall characteristic of container 30 under pressure or vacuum is substantially similar.For the thermo-setting elastomer material with at other material that after axle 54 takes off, not necessarily keeps its shape, with described section flexible pipe material with optionally reinforced layer or blanket layer need the extra step that makes variable volume container 30 curing (curing) after being coated on the axle 54.Before using, take off variable volume container 30 from axle 54.
In order to quantize the effect of container geometry of the present invention, utilize the container geometry of the prior art of finite element analysis shown in coming in the container geometry of comparison diagram 4-6 and Fig. 1-3.In order to compare, two kinds of container profile being analyzed are used identical flexible pipe materials.On two container profile, simulate the pressure in the chamber 28 and 46 that is similar to the pressure that exists in the typical recycling hydraulic system.Comparison diagram 3 and 6, near the elastic strain that variable volume container 30 of the present invention shows end wall 26 less than the container 20 of prior art near the elastic strain that shows the opposite end walls part 38 (by arrow 66 indication).Another benefit of container 30 is on the outer surface 50 of the next-door neighbour's transition wall 42 that is dispersed in container of the maximum elastic strain 52 in the flexible pipe 32, rather than concentrates in the end wall portion 38 of container 20 of prior art.In addition, the maximum elastic strain 29 of the maximum elastic strain 52 of the specific location in the outer surface of flexible pipe 32 50 in the container 20 of prior art, this has reduced to occur in the flexible pipe material danger of crack or other damage.But the aggregate elastic strain in the variable volume container 30 is greater than the aggregate elastic strain in the container 20 of prior art, and this has improved the memory of container 30.
Illustrate and illustrated the present invention particularly with reference to previous embodiment, described embodiment only is an explanation preferred forms of the present invention.One skilled in the art will understand that do not breaking away under the situation of the spirit and scope of the present invention as defined by the appended claims, putting into practice the plurality of optional scheme that can adopt the embodiment of the invention described in the literary composition when of the present invention.Appended claim is used to limit scope of the present invention, covers interior method and apparatus of these claim scopes and their equivalent thus.This explanation of the present invention is understood to include all novelties and the non-obvious combination of element described in the literary composition, and can be in this or application subsequently to all novelties of these elements and non-obvious combination claim is proposed.In addition, previous embodiment is illustrative, does not have single feature or element to be absolutely necessary for all possible combination that can propose claim in this or application subsequently.

Claims (25)

1. a variable volume container (30) comprising:
Flexible pipe (32) with wall (34) of qualification variable volume chambers (36), tube wall comprises a pair of end wall portion (38) and a pair of smooth generally intermediate wall portion (40) that is as general as arc, described intermediate wall portion separates by transition wall (42) and described end wall portion, and described smooth generally intermediate wall portion (40) is spaced from each other under neutral state.
2. according to the variable volume container of claim 1, it is characterized in that the height (H of the described intermediate wall portion of next-door neighbour (40) of described variable volume container (30) 2) less than the height (H of the described end wall portion of next-door neighbour (38) of described variable volume container (30) 1, H 3).
3. according to the variable volume container of claim 1, it is characterized in that described variable volume chambers (36) comprises a pair of spherical end portion cavity (44) and the middle cavity (46) that is as general as described two end portion cavity of being connected of rectangle (44) under neutral state of being as general as.
4. according to the variable volume container of claim 1, it is characterized in that, described to end wall portion (38) by the first radius (R 1) limit, described transition wall (42) is by the second radius (R 2) limit the described first radius (R 1) less than the described second radius (R 2).
5. according to the variable volume container of claim 4, it is characterized in that flexible tube wall (34) comprises the internal surface (48) that limits described variable volume chambers (36), and the described first radius (R 1) be included in the radius of the internal surface (48) in the end wall portion (38) of this flexible tube wall (34), the described second radius (R 2) be included in the radius of the internal surface (48) in the transition wall (42) of this flexible tube wall (34).
6. according to the variable volume container of claim 4, it is characterized in that the described second radius (R 2) length be approximately the described first radius (R 1) the twice of length.
7. according to the variable volume container of claim 1, it is characterized in that described variable volume container also comprises reinforced layer (62) or the protective cover (64) that covers on the described flexible pipe (32).
8. a variable volume container (30) comprising:
Have the flexible pipe (32) of pair of end walls part (38) and a pair of smooth generally intermediate wall portion (40), described intermediate wall portion separates by transition wall (42) and described end wall portion (38), and wherein said end wall portion (38) is by the first radius (R 1) limit, described transition wall (42) is by the second radius (R 2) limit.
9. variable volume container according to Claim 8 is characterized in that, the described first radius (R 1) less than the described second radius (R 2).
10. variable volume container according to Claim 8 is characterized in that, the described second radius (R 2) length be approximately the described first radius (R 1) the twice of length.
11. variable volume container according to Claim 8 is characterized in that, flexible tube wall (34) comprises the internal surface (48) that limits variable volume chambers (36), and the described first radius (R 1) be included in the radius of the internal surface (48) in the end wall portion (38) of this flexible tube wall (34), the described second radius (R 2) be included in the radius of the internal surface (48) in the transition wall (42) of this flexible tube wall (34).
12. variable volume container according to Claim 8 is characterized in that, described variable volume container also comprises reinforced layer (62) or the protective cover (64) that covers on the described flexible pipe.
13. a variable volume container (30) comprising:
Limit the flexible tube wall (34) of variable volume chambers (36), described variable volume chambers (36) comprises a pair of spherical end portion cavity (44) and the middle cavity (46) that is as general as described two end portion cavity of being connected of rectangle (44) under neutral state.
14. variable volume container according to claim 13, it is characterized in that, described flexible tube wall (34) comprise a pair of at least in part around the end wall portion (38) of described end portion cavity (44), a pair of at least in part around described middle cavity (46) be spaced from each other and smooth generally intermediate wall portion (40) and be positioned at described end wall portion (38) and described intermediate wall portion (40) between transition wall (42), wherein said end wall portion (38) is by the first radius (R 1) limit, described transition wall (42) is by the second radius (R 2) limit.
15. the variable volume container according to claim 14 is characterized in that, described flexible tube wall (34) comprises internal surface (48), and the described first radius (R 1) be included in the radius of the internal surface (48) in the end wall portion (38) of this flexible tube wall (34), the described second radius (R 2) be included in the radius of the internal surface (48) in the transition wall (42) of this flexible tube wall (34).
16. the variable volume container according to claim 13 is characterized in that, described variable volume container also comprises reinforced layer (62) or the protective cover (64) that covers on the flexible pipe.
17. a variable volume container (30) comprising:
The flexible tube wall (34) that comprises pair of end walls part (38), described end wall portion is connected to a pair of smooth generally intermediate wall portion (40) by transition wall (42), wherein said intermediate wall portion (40) is spaced from each other under neutral state, and described transition wall (42) is configured to be increased between phase of expansion of flexible pipe and stands the amount of the flexible tube wall (34) of elastic strain, and makes the elastic strain in one or more zones of flexible tube wall (34) concentrate minimum.
18. the variable volume container according to claim 17 is characterized in that, described flexible tube wall (34) limits the variable volume chambers (36) with the profile that is as general as dog bone shape.
19. the variable volume container according to claim 17 is characterized in that, described flexible tube wall (34) comprises the profile that is as general as dog bone shape.
20. the variable volume container according to claim 17 is characterized in that, described end wall portion (38) is by the first radius (R 1) limit, described transition wall (42) is by the second radius (R 2) limit the described first radius (R 1) less than the described second radius (R 2).
21. the variable volume container according to claim 20 is characterized in that, described flexible tube wall (34) comprises the internal surface (48) that limits variable volume chambers (36), and the described first radius (R 1) be included in the radius of the internal surface (48) in the end wall portion (38) of this flexible tube wall (34), the described second radius (R 2) be included in the radius of the internal surface (48) in the transition wall (42) of this flexible tube wall (34).
22. the variable volume container according to claim 17 is characterized in that, described variable volume container also comprises reinforced layer (62) or the protective cover (64) that covers on the flexible pipe.
23. a method of making variable volume container (30) may further comprise the steps:
The axle that is as general as dog bone shape (54) is provided, and described axle comprises a pair of first thickness (T that has 1) balled end (56), connect described two balled end and have less than the described first thickness (T 1) the second thickness (T 2) smooth generally intermediate portion (58) and in the described balled end (56) each is connected to the transition portion (60) of described intermediate portion (58); And
One section flexible pipe material (34) is coated on the described axle (54), formation has the variable volume container (30) of variable volume chambers (36), and the size of described variable volume chambers and shape correspond essentially to described flexible pipe material (34) coating axle (54) thereon.
24. the method according to claim 23 is characterized in that, described method also is included in described flexible pipe material (34) and goes up the step that coats reinforced layer (62) or protective cover (64).
25. the method according to claim 23 is characterized in that, described method also is included in described section flexible pipe material (34) is coated on last described flexible pipe material (34) step of curing that makes afterwards of axle (54).
CNA2005800330212A 2004-09-30 2005-09-28 Variable volume container Pending CN101031726A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/954,751 2004-09-30
US10/954,751 US20060086751A1 (en) 2004-09-30 2004-09-30 Variable volume container

Publications (1)

Publication Number Publication Date
CN101031726A true CN101031726A (en) 2007-09-05

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CNA2005800330212A Pending CN101031726A (en) 2004-09-30 2005-09-28 Variable volume container

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US (1) US20060086751A1 (en)
EP (1) EP1800011A1 (en)
CN (1) CN101031726A (en)
BR (1) BRPI0515837A (en)
MX (1) MX2007003862A (en)
WO (1) WO2006035298A1 (en)

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ATE418006T1 (en) * 2006-10-10 2009-01-15 Magneti Marelli Powertrain Spa FUEL SUPPLY SYSTEM WITH ELECTRONIC INJECTION

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MX2007003862A (en) 2007-05-18
BRPI0515837A (en) 2008-08-12
US20060086751A1 (en) 2006-04-27
WO2006035298A1 (en) 2006-04-06
EP1800011A1 (en) 2007-06-27

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