EP0638381B1 - Boítiers, en particulier pour convoyeurs hydrauliques - Google Patents

Boítiers, en particulier pour convoyeurs hydrauliques Download PDF

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Publication number
EP0638381B1
EP0638381B1 EP94111102A EP94111102A EP0638381B1 EP 0638381 B1 EP0638381 B1 EP 0638381B1 EP 94111102 A EP94111102 A EP 94111102A EP 94111102 A EP94111102 A EP 94111102A EP 0638381 B1 EP0638381 B1 EP 0638381B1
Authority
EP
European Patent Office
Prior art keywords
housing
pressure
core
pressure chamber
housing according
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.)
Expired - Lifetime
Application number
EP94111102A
Other languages
German (de)
English (en)
Other versions
EP0638381A2 (fr
EP0638381A3 (fr
Inventor
Willi Parsch
Erwin Stämmler
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.)
LuK Fahrzeug Hydraulik GmbH and Co KG
Original Assignee
LuK Fahrzeug Hydraulik GmbH and Co KG
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 LuK Fahrzeug Hydraulik GmbH and Co KG filed Critical LuK Fahrzeug Hydraulik GmbH and Co KG
Publication of EP0638381A2 publication Critical patent/EP0638381A2/fr
Publication of EP0638381A3 publication Critical patent/EP0638381A3/fr
Application granted granted Critical
Publication of EP0638381B1 publication Critical patent/EP0638381B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art

Definitions

  • the invention relates to a housing, in particular for a hydraulic conveyor made of cast iron, with pressurizable and / or to be sealed Areas.
  • housings are known. This is how machine components become as castings, for example as diecastings, trained because this is so easy Way even with a relatively complicated Have the shape realized.
  • the Housing manufactured by a die casting process be, although the invention is not on die-cast housing limited, for example also by a well-known gravity casting can be produced.
  • die-cast aluminum Manufacture housing in a lightweight design.
  • aluminum for casings of vane pumps it should be noted, however, that during the Intended use of the vane pump very high pressures in the medium to be pumped, for example oil.
  • housing parts can do this deform or at least in some areas deflect.
  • these housing parts for example Boundary surfaces for a displacement unit, for example the vane rotor of the vane pump off, they simultaneously represent the rotor side surfaces of the vane rotor.
  • These form a separation area between at least one pressure chamber and at least one suction room that this seals against each other. Is it now due to high pressures to deflect these rotor side surfaces, there may be an increased leakage between the Pressure and suction chamber of the vane pump, thereby affecting their efficiency becomes.
  • To counteract the deflection of the rotor side surface it is known to be spaced apart from these pressure chamber exerting counter pressure in the housing assign.
  • the housing is composed of several housing parts, the corresponding one, resulting in the pressure chamber Have recesses.
  • This pressure chamber is beyond a connection, for example with the printed page the vane pump in connection, so that in the pressure chamber also one of those to be promoted Medium outgoing pressure builds up.
  • This pressure works now from the other side of the wall area the housing between the pressure chamber and the Conveying chamber outgoing pressure and prevents such a deformation or deflection of the rotor side surfaces.
  • the pressure chambers causing the counterpressure are only very complex can be produced and by the Assembly of several housing parts additional joints to be sealed result in additional joints Leakage losses can result.
  • the channels during the Die casting the housing simultaneously with by inserting cores into a die be introduced after the die casting process are removed and thus the channels then result.
  • high pressures for example of 1400 bar
  • the casting material with a high flow rate for example 50 m / s in the If the mold enters, the cores are subject to a high Stress that leads to radiation erosion at the Can lead core surface.
  • the after Removing the cores to flow through used for example by liquid media should be particularly smooth Surface so that there is no unnecessary loss of effectiveness can arise.
  • the during the die casting process resulting "fraying" of the cores, however straight to bumps on the wall of the cast Channels.
  • DE 40 23 961 A1 is a one-piece pump housing known from a die-cast aluminum workpiece.
  • a molded part is known from DE 41 02 358 A1 by a die casting process, wherein to achieve functional cavities in the molded part Deposits can be arranged.
  • DE 22 19 588 a method and an apparatus for the production of pressure medium channels in Cast housing of hydraulic machines known.
  • the invention is therefore based on the object To create housing of the generic type that itself characterized by a simple structure and a has good leakage behavior.
  • the Areas at least one pressurizable Pressure room is assigned that the pressure room Area is arranged substantially in parallel the areas with based on the pressure in the pressure room Forces can be applied to the pressure forces counteract and that the pressure chamber over at least a connection with a medium to be funded areas subject to pressure stands, and that the at least one pressure chamber and the at least one connection simultaneously with the Pour at least one housing part of the housing is achievable, it is advantageously possible to use the pressure chamber easy to insert without removing the housing several individual housing parts to form the Pressure space needs to be assembled. At the same time can by pouring the pressure chamber into the Housing this any geometric shape have so that the effect of this pressure space outgoing pressure fields can be optimized.
  • Pressure chamber can be designed in this way, for example be that it has different clear widths, that is, for example widening or the like has, so that from the pressure chamber into the housing emitting pressure fields can be influenced in a targeted manner.
  • the print fields can be printed in their Main direction of action can be set so that a higher back pressure in particularly critical areas can be built up on less critical ones Areas.
  • Another major advantage is themselves that through the cast pressure fields Overall housing can be built from fewer parts can, so that additional sealing problems between the Joints of individual housing parts can be avoided.
  • a housing in which the pressure chamber is preferred through at least one placed in the mold, after casting at least partially remaining in the housing Core is formed. This makes it possible about the - known per se - introduction of a Kerns in a casting mold resulting in the later housing to a special design and effect of Pressure room to influence.
  • Remain at least part of the core in the Housing can have a core material selection and / or a very special shape of the core targeted to the pressure fields generated by the pressure chamber Be influenced.
  • the Housing remaining core from a different material than the housing is made of can be different Material combination, taking into account if necessary of a different elastic Behavior under pressure and / or a different Thermal expansion behavior the effect a pressure field starting from the pressure chamber be strengthened or weakened.
  • a housing is preferred in which the core consists of a solid, porous, high-strength material, preferably of aluminum oxide (Al 2 O 3 ).
  • Al 2 O 3 aluminum oxide
  • the die-cast material thus lies around the core in a virtually form-fitting and non-positive manner and forms a firm, highly resilient bond.
  • a medium under pressure can be introduced into the inner pores of the core remaining in the housing during the intended use of the housing, so that it can be distributed over the pores of the porous material.
  • Such a core is suitable for building up very effective pressure fields which deflect the regions of the housing located in the immediate vicinity of the core.
  • the space enclosed by the core in the housing for the housing itself does not form an immediate fault, so that a pressure chamber constructed in this way is in the immediate vicinity of the pressurizable medium Area of the housing can be arranged.
  • a wall thickness of the housing between the pressurized area and the pressure chamber causing the counterpressure can thus be chosen to be relatively small, so that the effectiveness of the pressure chamber increases. Due to the relatively small wall thickness of the housing mentioned, a damping behavior of the housing, for the deflection of the housing section, cannot substantially influence the structure of the pressure fields which cause the counterforce.
  • the core is formed in two parts and consists of an inner part and an inner part Part enclosing outer part. It can preferably be provided that both the inner Part and the outer part of the core in the housing remain and form the pressure chamber.
  • the inner part the core can preferably be made of a high strength porous material, for example aluminum oxide, so that this on the one hand the support of the outer part of the core during die casting of the Housing takes over and on the other hand during the intended Use of the housing construction of the pressure fields already mentioned takes over.
  • a high strength porous material for example aluminum oxide
  • a housing in which the Pressure core resulting only with an outer as Shell formed part remains in the housing while the inner part is designed as a filling and is removed after the casting is complete.
  • This makes it possible to design the pressure chamber that this of a in a cavity of the Housing arranged, in turn having a cavity Shell is formed, which is form-fitting fits the housing.
  • the pressure room can be so immediate be supplied with the medium to be pumped, so this puts the pressure on the shell of the core can derive, which then the pressure field within the Housing builds.
  • the shell can be made from one high-strength, dimensionally stable material, so that this alone due to its stiffness as a support element for the one to be conveyed Medium pressurized area of the housing serves and thus a deflection of this area is hindered.
  • the one built inside the pressure chamber Pressure then forms an additional pressure field so that the arrangement made here is a Deflection of a wall area of the housing in particular counteracts effectively.
  • a casting mold 10 is shown schematically in FIG. 1, those with an opening 12 Lid 14 is closed.
  • the mold 10 is there according to the shape of the later molding (Housing of a vane pump).
  • In at least one core 16 is arranged in the casting mold 10, the in a suitable manner known per se at the Casting mold 10 is fixed.
  • the core 16 has one Shell 18 that surrounds a cavity 20.
  • the cavity 20 is provided with a filling 22.
  • the core 16 can be constructed in this way, for example be that the shell 18 is made of steel and a Filling 22 made of sand, oil, paraffin, gas, wax or has similar.
  • the shell 18 is tightly closed, so that the filling 22 does not come out of the cavity 20 can emerge.
  • the closing can for example done by welding, or the Shell 18 is constructed so that, for example, on a side of the mold 10 facing one has closable lid. It is still conceivable that with a filling 22 made of oil Channels not shown here through the mold 10th is connected to a cooling system.
  • the molding can be removed from the mold 10 are removed, the core 16 then in the molding.
  • the filling 22 can now from the Shell 18 are removed. Since the filling 22 none Stiffness, it can very easily the cavity 20 are removed.
  • the shell 18 remains now in the molding and is with the material of the molding connected positively. By appropriate dimensioning of the shell 18 can each any shape of a cavity 20 in a casting will be realized. This doesn't necessarily have to - as shown in Figure 1 - a cylindrical shape be.
  • cores 16 in any shape, for example through openings manufacturing cores can.
  • the cores can also be used as a ring segment (Pipe part) with sealed ends.
  • the ring segment is so massive that the pressure forces occurring during the casting process can be intercepted. After the pouring process, the ends of the ring segment, but of course any wall areas, be drilled, so that the interior of the pipe part is available as a cavity.
  • the cores 16 can also be designed so that they a shell 18 made of high-strength and erosion-resistant Have material that even without introducing a Filling 22 have a necessary stiffness, so that a pressure equalization by introducing the Filling 22 can be dispensed with.
  • die castings with very large Strength that is precisely fixed, cavities with an extremely smooth surface and / or have through openings. Since one anyway subsequent processing is very difficult the walls of the cavities can be omitted these die-cast parts are manufactured very economically are and also have improved properties on. These come in particular Wear when the cavities so produced in die cast parts to flow through, for example, liquid Media - or print rooms - as in detail will be explained, should be used.
  • a vane pump 24 is shown in FIG. which, for example, as a power steering pump in motor vehicles Application.
  • the vane pump 24 has a housing 26, which as an aluminum die-cast part - According to the principle addressed to Figure 1 Casting technology - is executed.
  • the housing 26 takes a drive shaft mounted in a known manner 28 on which a vane rotor 30 is rotatably mounted.
  • the rotor 30 has radial Slits 32 slidably mounted wings 34.
  • the rotor 30 is within a contour ring 36 arranged, which is rotatably connected to the housing 26 is.
  • Wing 34 When the rotor 30 rotates Wing 34 on an inner contour 38 which is oval-shaped is trained, guided along. This will make the Wing 34 corresponding to the contour development radially out of the rotor 30 or radially into the rotor 30 moved into it.
  • the wings 34 form between the Rotor 30 and the contour ring 36 between two Wing out 34 individual room sections whose Volumes larger and larger during the rotation of the rotor 30 get smaller. In this way, one hand arises within the spaces separated by the wings 34 a negative pressure and on the other hand, with a Volume reduction, overpressure.
  • the wings 34 are pressed sealingly against the inner contour 38, so that a medium, such as oil, from a Suction area is promoted to a pressure area.
  • the oil becomes a, not shown in Figure 2, connected to the vane pump 24 Consumers, for example steering a motor vehicle, promoted.
  • Consumers for example steering a motor vehicle
  • Flow control valve 42 arranged in one to the consumer leading channel 40 in one to the consumer leading channel 40.
  • the flow control valve 42 is not behind one in Figure 2 shown control collar of an annular space 44th surrounded by the symmetrically arranged outflow channels (Booster) 46 with a suction area of the Vane pump 24 is connected.
  • Booster outflow channels
  • the rotor 30 for example of an internal combustion engine Motor vehicle driven.
  • the one from the vane pump 24 volume flow is promoted, for example the steering of the motor vehicles available posed.
  • high volume flow is often not required.
  • the provided but now not required large volume flow leads to a relocation of the tax union of the Flow control valve 42 so that the excess oil from the channel 40 via the annular space 44 into the outflow channels 46 is hosed.
  • This under high Oil under pressure has a very high kinetic Energy causing erosion on the walls of the Outflow channels 46 or the annular space 44 would lead.
  • FIG 3 is another embodiment a vane pump 24 is shown. Same Parts as in Figure 2 are - despite one part different construction - with the same reference numerals provided and not explained again here.
  • the Housing 26 has a recess 48 inside the rotor 30 mounted on the drive shaft 28 is arranged is.
  • the drive shaft 28 is in a bearing 50 performed and counterpointed a bearing 52.
  • the bearing 52 is here in a Cover trained housing part 54 which with the Housing 26 connected in a suitable manner, for example is screwed so that the recess 48th is sealed to the outside. This is in detail Seals not to be explained.
  • Of a High pressure outlet 56 does not lead duct 58 to one represented consumers. Branches from channel 58 a channel 60 leading to the flow control valve 42.
  • the flow control valve 42 has one against the force a spring element 62 axially displaceably mounted Valve piston 64.
  • a control collar 66 of the valve piston 64 seals an outflow channel 46 with respect to the channel 60 from.
  • the outflow channel 46 opens into a suction area 68 of the vane pump 24.
  • the blades 34 of the rotor 30 are in operation the vane pump 24 along the contour ring 36 moves so that the medium to be conveyed, for example oil, sucked out of the suction area 68 and is pumped away at the high pressure outlet 56. If the pressure in the high pressure outlet exceeds 56 connected channels 58 and 60, respectively certain value, for example because a connected The consumer works at idle Valve piston 64 of the flow control valve 42 against the Force of the spring element 62 shifted so that a Connection between the channel 60 and the outflow channel 46 becomes free. This causes the oil to flow at a higher rate kinetic energy in the suction area 68 of the vane pump 24 back.
  • the individual channels 58, 60 or 46 can be the one in the previous Figures have mentioned structure, whereby in 3 in detail, one remaining in the housing 26 Shell 18 of a casting core not shown is.
  • the housing part 54 has a recess 70 which via a connecting channel 72 also with the High pressure side of the vane pump 24 connected is.
  • the recess 70 is designed so that forms a cavity 74 opposite the rotor 30.
  • the recess 70 or the connecting channel 72 are cast into the housing part 54, the details of Figure 1 already explained options for the design of the Cavity 74 can be used.
  • the wings 34 of the rotor 30 With their side edge the housing part 54 sealingly.
  • the housing part 54 thus serves at the same time as a lateral guide or relationship Tread for the wing 34.
  • the on the end face 76 of the housing part adjoining the rotor 30 54 thus has in addition to the leadership of the wing 34 a seal between adjacent ones of the Wing 34 formed room sections to take over. Any occurring between adjacent room sections Leakage leads to loss of effectiveness of the entire Vane pump 24, since the pressure build-up in the high pressure outlet 56 is influenced.
  • the prevailing high pressure also affects the End face 76 and strives to get this from the rotor 30 push away so that the wings 34 no longer are sealingly guided along the end face 76. This leads to the leakage already mentioned.
  • Cavity 74 is provided.
  • the cavity 74 prevails by connecting to the high pressure area of the Vane pump 24 the same pressure as for example in channel 60.
  • This in cavity 74 prevailing pressure affects among others the End face 76 facing end face 78 of the cavity 74.
  • a Pressure field created in the direction of the rotor 30th works. This from the cavity 74 in the direction of Rotor 30 acting pressure field thus acts as a counter pressure field to the inside of the rotor 30 between certain Wings 34 (depending on the position of wings 34) acting high pressure.
  • Face surface 78 of the cavity 74 can with the sealing system of the wing 34 their side faces at area 80 influence be taken.
  • the end face 78 which in Seen from above, essentially circular, formed as a lateral surface of a cone. From one in the area of an axis of rotation 82 of the rotor 30 lying point runs the end face 78 - in Section viewed - tapering to the outside. This makes it possible that in the direction of the rotor 30 acting pressure field emanating from the cavity 74 to specifically target the areas of the end face 76, in which a special one on the part of the rotor 30 high pressure load occurs.
  • the one shown in Figure 3 Possibility of designing the cavity 74 only by way of example.
  • FIG. 24 Another vane pump 24 is shown in FIG shown.
  • the presentation is only excerpts and schematically, with equal parts as in Figures 2 and 3 despite a partially different one Structure with the same reference numerals are.
  • the housing 26 has an axially extending Recess 84, within which the drive shaft 28 is guided is. Outside the housing 26 is on the drive shaft 28 a drive means 86 arranged in a rotationally fixed manner, for example from an internal combustion engine a motor vehicle is drivable.
  • a drive means 86 arranged in a rotationally fixed manner, for example from an internal combustion engine a motor vehicle is drivable.
  • Pump housing part indicated by dashed lines in FIG 88 there is a recess 90 inside which the contour ring 36 is rotatably arranged.
  • Within of the contour ring 36 is that of the drive shaft 28 driven rotor 30 arranged.
  • the wings 34 are - as already mentioned - on the contour ring 36 moved along.
  • the recess 36 is at its Drive shaft 28 side facing away from a pressure plate 92 limited.
  • the blades 34 of the rotor 30 are between the housing 26 and the pressure plate 92 so arranged that they seal with their side surfaces are led.
  • the rotor 30 itself is in one Pump room 94 arranged, at least in a known manner a pressure chamber 96 and a suction chamber 98 owns.
  • the pressure chamber 96 has a high pressure outlet 100, which penetrates the pressure plate 92 and - not shown in Figure 4 - to a consumer and possibly leads to a flow control valve.
  • Inside the housing 26 is approximately annular trained cavity 102 arranged which the Grips drive shaft 86 receiving recess 84.
  • the cavity 102 is connected via a connection 104 the high pressure outlet 100 within the housing part 88 (not shown in Figure 4) in connection.
  • the cavity 102 results from a the principle explained with the help of Figure 1 Possibilities.
  • the cavity 102 resulting core from a in Figure 4 not shell 18 shown exist during the Casting the housing 26 has a filling 22.
  • connection 104 for example by drilling the housing 26 can, the shell 18 is pierced so that the Filling 22 through the opening thus created, due to their non-existent stiffness can, so that the cavity 102 results.
  • FIG. 5 shows a partial region 110 of a housing 26 shown.
  • the sub-area 110 is within the Housing 26 arranged so that its end face 112th and / or 114 has to perform a sealing function. This can be done, for example, in the Figures 3 and 4 explained sealing guidance of Wings 34 with their side edges or one Join to another component of the housing 26 or to a component arranged on this.
  • the structure of pressure fields within the housing 26 is to be clarified again in principle.
  • a core 16 is placed in the mold.
  • the core 16 consists of a solid, porous, high-strength material, for example of aluminum oxide Al 2 O 3 .
  • the outer pores of the core 16 form a positive connection with the material of the housing 26.
  • indicated holes 116 are placed in such a way that there is a connection between them a region of high pressure and the core 16. This can be, for example, the high-pressure outlet 96 mentioned previously in FIG. 4.
  • the medium to be conveyed reaches the area of the core 16. Since the core 16 itself consists of a porous material, the medium can be inside the core 16 spread out. The porosity of the core 16 is chosen so that it can absorb the pressurized medium, for example, like a sponge.
  • the pressure now also prevailing within the core 16 causes a pressure field to be built up, which is to be illustrated in FIG. 5 with the arrows 118. The material of the housing 26 surrounding the core 16 is deflected away from the core 16 by this pressure field 118. As a result, the partial region 110 of the housing 26 shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (14)

  1. Boítier (26), en particulier pour un convoyeur hydraulique (24), en fonte, comportant des zones pouvant être mises sous pression et/ou à étanchéifier (76), caractérisé en ce qu'il est associé aux zones (76) au moins un espace de pression pouvant être chargé en pression (74), en ce que l'espace de pression (74) est disposé pour l'essentiel parallèlement à la zone (76), en ce que les zones (76) peuvent être soumis à des forces reposant sur la pression régnant dans l'espace de pression (74) qui agissent en sens inverse par rapport aux forces de pression, et en ce que l'espace de pression (74) est relié par l'intermédiaire d'au moins un raccord (72) aux zones pouvant être mises sous pression via un milieu à mettre en circulation, et en ce que ledit au moins un espace de pression (74) et ledit au moins un raccord (72) peuvent être obtenus simultanément avec le coulage d'au moins un élément de boítier (54) du boítier (26).
  2. Boítier selon la revendication 1, caractérisé en ce que l'espace de pression (74) est conçu par au moins un noyau (16), déposé dans le moule de coulage et demeurant, après le coulage, au moins pour partie dans le boítier (26).
  3. Boítier selon l'une des revendications précédentes, caractérisé en ce que le noyau (16) se compose d'un matériau dur, poreux et à haute résistance.
  4. Boítier selon l'une des revendications précédentes, caractérisé en ce que le noyau (16) se compose d'oxyde d'aluminium (Al2O3).
  5. Boítier selon l'une des revendications précédentes, caractérisé en ce que le noyau (16) est conçu en deux moitiés et se compose d'une partie intérieure et d'une partie extérieure qui entoure la partie intérieure.
  6. Boítier selon l'une des revendications précédentes, caractérisé en ce que la partie intérieure et la partie extérieure demeurent, après coulage, dans le boítier (26) et constituent l'espace de pression.
  7. Boítier selon l'une des revendications précédentes, caractérisé en ce que la partie intérieure se compose d'un matériau dur, poreux et à haute résistance.
  8. Boítier selon l'une des revendications précédentes, caractérisé en ce que la partie intérieure se compose d'oxyde d'aluminium (Al2O3).
  9. Boítier selon l'une des revendications précédentes, caractérisé en ce que la partie extérieure est conçue sous forme d'un corps creux.
  10. Boítier selon l'une des revendications précédentes, caractérisé en ce que le corps creux se compose d'un matériau indéformable à haute résistance.
  11. Boítier selon l'une des revendications précédentes, caractérisé en ce que la partie intérieure est formée par une matière de charge (22) qui est ôtée après le coulage, de telle sorte que seule demeure dans le boítier (26) la partie extérieure.
  12. Boítier selon l'une des revendications précédentes, caractérisé en ce que le noyau (16) se compose exclusivement d'une partie extérieure (corps creux), qui demeure dans le boítier (26) après le coulage.
  13. Boítier selon l'une des revendications précédentes, caractérisé en ce que le raccord (72) est coulé dans le boítier (26) simultanément avec l'espace de pression.
  14. Boítier selon l'une des revendications précédentes, caractérisé en ce que le raccord (72) peut être obtenu par un perçage ciblé de l'espace de pression.
EP94111102A 1993-08-13 1994-07-16 Boítiers, en particulier pour convoyeurs hydrauliques Expired - Lifetime EP0638381B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4327242A DE4327242A1 (de) 1993-08-13 1993-08-13 Verfahren zum Herstellen von Druckgußteilen
DE4327242 1993-08-13

Publications (3)

Publication Number Publication Date
EP0638381A2 EP0638381A2 (fr) 1995-02-15
EP0638381A3 EP0638381A3 (fr) 1996-10-16
EP0638381B1 true EP0638381B1 (fr) 1999-11-10

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EP94111102A Expired - Lifetime EP0638381B1 (fr) 1993-08-13 1994-07-16 Boítiers, en particulier pour convoyeurs hydrauliques

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EP (1) EP0638381B1 (fr)
DE (2) DE4327242A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008033086A1 (de) 2007-08-08 2009-02-12 Grohe Ag Verbundgussverfahren

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918987A1 (de) * 1999-04-27 2000-11-02 Man Nutzfahrzeuge Ag Verfahren zum Eingießen von Hohlkörpern in Eisengußbauteile
DE102004005324A1 (de) * 2004-02-04 2005-08-25 Daimlerchrysler Ag Sandkern und Verfahren zur Herstellung desselben
DE102005043253B4 (de) * 2005-09-09 2014-09-04 Zf Lenksysteme Gmbh Verfahren zum Herstellen einer Verdrängerpumpe und eine danach hergestellte Verdrängerpumpe
US8327910B2 (en) 2010-12-15 2012-12-11 GM Global Technology Operations LLC Method of supporting tubing structures during overcasting

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219588A1 (de) * 1972-04-21 1973-10-25 Teves Gmbh Alfred Verfahren und vorrichtung zur herstellung von druckmittelkanaelen in gussgehaeusen von hydromaschinen
DE3129391C1 (de) * 1981-07-25 1982-11-04 Estel Hoesch Werke Ag, 4600 Dortmund Verfahren zur Herstellung von Gusskoerpern mit eingegossenen Rohren aus Stahl
DE3520484A1 (de) * 1985-06-07 1986-12-11 Daimler-Benz Ag, 7000 Stuttgart Verfahren zum herstellen von leichtmetallen mit eingegossenem gleitstueck aus keramik nach dem druckgussverfahren und giessform zum herstellen solcher leichtmetallteile
CA2021543C (fr) * 1989-07-28 1999-03-09 Norman A. Cyphers Aluminium moule dont les surfaces subissant un effort ont ete durcies et usinees
DE3926069C1 (en) * 1989-08-07 1990-10-31 Walter Hundhausen Gmbh & Co Kg, 5840 Schwerte, De Casting spheroidal e.g. tube graphite cast iron casting - comprises sheathing tube in carbon fibres in shell or flexible hose form before inserting in mould
DE4102358C2 (de) * 1991-01-26 2000-05-11 Volkswagen Ag Im Druckgußverfahren herzustellendes Formteil, Verfahren zur Herstellung des Formteils sowie Hohlkörper zur Einlage in das Formteil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008033086A1 (de) 2007-08-08 2009-02-12 Grohe Ag Verbundgussverfahren
EP2033721A1 (fr) 2007-08-08 2009-03-11 Grohe AG Procédé de fonte composite

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DE4327242A1 (de) 1995-02-16
DE59408899D1 (de) 1999-12-16
EP0638381A2 (fr) 1995-02-15
EP0638381A3 (fr) 1996-10-16

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