WO2005098291A1 - Soupape de pression pour un carter de boite - Google Patents

Soupape de pression pour un carter de boite Download PDF

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Publication number
WO2005098291A1
WO2005098291A1 PCT/EP2005/001177 EP2005001177W WO2005098291A1 WO 2005098291 A1 WO2005098291 A1 WO 2005098291A1 EP 2005001177 W EP2005001177 W EP 2005001177W WO 2005098291 A1 WO2005098291 A1 WO 2005098291A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve body
main surface
membrane
valve plug
Prior art date
Application number
PCT/EP2005/001177
Other languages
German (de)
English (en)
Inventor
Cecilia Björkman
Jens Rehfeldt
Cornelia Pötters
Original Assignee
W.L. Gore & Associates Gmbh
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 W.L. Gore & Associates Gmbh filed Critical W.L. Gore & Associates Gmbh
Publication of WO2005098291A1 publication Critical patent/WO2005098291A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members

Definitions

  • the invention relates to a valve plug for ventilating an oil-carrying gear housing.
  • Breather valves of gears are often a special source of contamination.
  • a temperature-related excess pressure is reduced, so that hot oil foam, oil mist, oil drops or old steam often escapes into the surroundings with the air escaping under high pressure.
  • Such an uncompensated and regular oil leakage is unacceptable for many applications, in particular for the industries mentioned above, because of the danger to the operating personnel and the contamination of the production rooms.
  • the interior of the gearbox must also be protected from contamination by moisture or dust, so that gearboxes are often only equipped with unidirectional pressure relief valves that act from the inside out.
  • unidirectional pressure relief valves that act from the inside out.
  • a negative pressure arising due to a temperature drop in the transmission is not automatically compensated for.
  • labyrinth seals there is the further problem that the transmission or the system cannot be tilted without the oil escaping.
  • Such a valve must be sealed with a special seal for assembly and transport and put into operation in a separate operation after assembly.
  • DE 199 01 798 describes a bidirectional valve which is able to compensate for both an overpressure and a vacuum in the interior of the housing.
  • this solution also has the disadvantage that when the housing is vented, oil mist and old steam inevitably escape, are sprayed into the environment as a result of the pressure and cause contamination there. Likewise, dust and liquid can penetrate the housing through the vacuum valve and cause damage to the gear unit there.
  • the present invention is therefore based on the problem of proposing a valve which avoids the disadvantages mentioned, in particular prevents gear oil from escaping into the environment when venting and the penetration of dirt and water into the gear when venting.
  • a valve plug according to the invention is constructed from individual components in such a way that it can be inserted vertically into a ventilation opening of a transmission housing and become effective.
  • the individual components of the valve plug are arranged axially in a valve housing that consists of a There is a running wall, the respective head sides of which, when inserted, point as the inner head side in the direction of the interior of the transmission and as the outer head side point away from the transmission in the direction of the surroundings.
  • the outer head side of the valve housing is sealed with a porous membrane that is permeable to gas and in particular air.
  • the membrane is preferably also liquid-repellent, i.e. watertight at a water pressure of approximately 0.6 bar for 60 seconds. Such measurements are carried out by exposing a sample of the material to be examined to sufficient water pressure for a defined period of time.
  • the membrane is preferably oleophobic.
  • Such an oleophobic membrane can have an oil repellency of 4 or more, preferably 6 or more, according to the AATCC test method 118-1989 ASTM.
  • valve body Inside the valve housing, a valve body is inserted below the membrane in such a way that it seals off the inner wall of the valve housing so that the air escaping from the gearbox or flowing into the gearbox can only flow through two holes provided for this purpose in the valve body.
  • the circumference of the valve body is adapted to the cross-sectional geometry of the valve housing and forms an outer main surface in the direction of the membrane and an inner main surface in the direction of the transmission interior. Two bores run through the valve body, each starting in one of the main surfaces and opening in the other of the main surfaces.
  • the two bores together with closures that are attached to the valve body and only open in one direction, form an overpressure or venting valve through which an overpressure in the interior of the housing is reduced, and a vacuum or suction valve through which an underpressure prevailing in the interior of the housing is released.
  • a chamber is formed in the interior of the valve housing, into which air and, if necessary, oil from the transmission flows through the breather valve when the transmission is overpressured. At a negative pressure, air also flows through the chamber and the intake valve into the gearbox.
  • the two bores can be of identical design; their oppositely acting valve functions are obtained by appropriately arranged closures.
  • the hole that is part of the vent valve is closed on the outer main surface of the valve body by a one-way closure, which yields to an overpressure in the gear housing to compensate for this and withstands a vacuum.
  • the hole that is part of the suction valve on the inner main surface of the valve body is closed with a further closure which acts analogously to the mode of action of the vent valve closure and which yields to a negative pressure in the interior of the housing in order to compensate for this and to withstand an excess pressure.
  • the oil in the chamber collects on the outer major surface of the valve body. If the suction valve in the gearbox housing opens at a corresponding negative pressure to suck in air, the excess oil remaining in the chamber is drawn back into the gearbox interior. In this way, there are only limited amounts of oil in the chamber at all times, which in any case does not represent an amount of oil critical for the operation of the membrane. The membrane is thus protected from excessive oil contamination and its function is maintained permanently.
  • the closures are designed as sealing lips which close the respective bore with a prestress acting in the closure direction.
  • the sealing lip of the vent valve only opens when the interior of the housing is overpressured.
  • the sealing lip of the intake valve opens due to the preload at a certain negative pressure inside the housing.
  • the sealing lips are designed in the form of a cap with a circumferential edge and can be placed as a whole over one of the main sides of the valve body.
  • the peripheral edge of each of the sealing lips wraps around the lateral circumference of the valve body and forms an effective seal between the valve body and the inner wall of the valve housing.
  • the cap-shaped sealing lips can maintain their respective valve flap function by covering the bore to be closed on the main surface of the valve body on which they are mounted (the bore of the suction valve on the inner main surface and the bore of the vent valve on the outer main surface) ) and leave the other bore uncovered (the vent valve bore on the inner main surface and the suction valve bore on the outer main surface).
  • the two bores each run diagonally through the valve body and they are radially offset from one another in such a way that the ends of the bores to be covered by the respective sealing lips each emerge from the main surface at a greater radial distance from the center of the respective main surface, while the respectively uncovered ends of the bores emerge from the main surface at a correspondingly smaller radial distance from the center of the main surface.
  • the hole to be covered is therefore located at the edge and the hole not to be covered is located in the center.
  • a kappenför-shaped sealing lip can be put over each of the main surfaces of the valve body, in which a central opening is left open, which leaves the hole that is not to be covered, rather emerging centrally from the main surface.
  • the bore to be covered is then covered accordingly by the remaining part of the sealing lip and forms a valve.
  • the sealing lips are rotationally symmetrical, so that they can be used interchangeably on each of the main surfaces of the valve body. It is particularly advantageous to produce the sealing lips from an elastomeric plastic.
  • the required prestressing of the cap-shaped sealing lips can then be achieved by a corresponding preforming of the sealing lips acting in the closing direction, or by a convex shaping of the main surfaces of the valve body.
  • the preload is dimensioned so that the vent valve or the suction valve opens at an overpressure or a vacuum up to a maximum of 250 mbar.
  • the sealing lips preferably open at an overpressure or underpressure in the range from 150 to 200 mbar.
  • the two sealing lips can also be constructed from different materials, so that they also have different opening pressures.
  • the materials of the sealing lips are selected so that the suction valve opens at an opening pressure of 50 mbar and the vent valve opens at an opening pressure of 200 mbar.
  • the bore of the intake valve on the outer main side opens into a pocket-shaped recess which is as large as possible and is machined into the outer main surface of the valve body. Since the recess forms the lowest point of the chamber in the usual vertical use of the gear plug, the recess acts as a funnel in that any oil in the chamber collects in the pocket-shaped recess. From there it is sucked directly through the bore of the suction valve into the interior of the housing when a vacuum in the interior of the housing is compensated.
  • the inner main surface is also equipped with a pocket-shaped recess into which the bore which is part of the vent valve opens. Contrary to the recess in the outer main surface, this inner pocket-shaped recess initially has no function.
  • the advantage of this arrangement is that both main surfaces of the valve body are now constructed identically and its assembly is considerably simplified since there is no preferred installation direction.
  • a porous, polymeric membrane which consists for example of polyethylene, polypropylene or a fluoropolymer, is preferably used as the membrane.
  • Stretched polytetrafluoroethylene (ePTFE) is preferably used as the fluoropolymer.
  • ePTFE polytetrafluoroethylene
  • Such porous membranes have pore sizes of 0.1 to 20 ⁇ m, are preferably hydrophobic and oleophobic and ensure sufficient air throughput even when contaminated from the inside by oil escaping into the chamber. Since the contamination from oil in the chamber is minimized by the successive suction, a sufficient air throughput can be guaranteed even over longer operating times.
  • an oil separator can be attached as the innermost element in the valve housing below the valve body, which acts as splash protection during operation of the transmission and prevents the direct action of oil on the inner main surface of the filter body.
  • Such an oil separator can be realized as a wire mesh or knitted fabric or consist of other coarse filter fabrics. Labyrinth seals can also be used in this context.
  • the valve plug is inserted into the ventilation opening of the gear housing in a vertically sealing manner, so that the bidirectional valve function and the return of the oil escaping into the chamber is ensured.
  • the outer wall of the valve housing is provided with a corresponding fastening and sealing device, for example with a thread or another locking device, which cooperates with the gear housing in a sealing manner.
  • Figure 1 shows schematically the structure of a valve plug according to the invention in a lateral cross-sectional view
  • Figure 2 shows an embodiment of the valve plug with a valve body with diagonally offset bores
  • FIG. 3 shows an embodiment of the valve plug with a valve body with pocket-shaped recesses
  • Figure 4 shows an embodiment of the valve plug with membrane attachment and fixed valve body.
  • valve plug 1 In order to ensure the desired venting and ventilation function of the valve plug 1, it must be inserted essentially vertically into the gear housing 6. Nevertheless, slight deviations by a few degrees from the vertical ideal seat are possible. In the following description of the structure and operation of the valve plug 1, As illustrated in FIGS. 3 and 4, a valve plug 1 inserted vertically into the transmission housing 6 is accordingly assumed. In this respect, relative position and direction information always refer to the vertical orientation of the valve plug 1.
  • FIG. 1 shows the schematic structure of a valve plug 1 according to the invention, which is inserted into a transmission housing 6.
  • the valve plug 1 consists of a valve housing 2, in which a microporous membrane 5 and a valve body 3 are inserted in the direction of the gearbox interior 7 (downwards) as a closure of the valve plug 1 to the outside (upwards).
  • the valve plug 1 reduces the oil content in the air escaping from the transmission interior 7 in two steps. In this respect, it represents an air filter with valve function for controlled ventilation of the transmission.
  • valve body 3 Due to their axially superimposed arrangement, the valve body 3 and the membrane 5 form a chamber 4 in which oil collects, which together with the air flowing out of the transmission interior 7 has passed the valve body 3 and cannot overcome the microporous membrane 5.
  • the valve body 3 realizes two oppositely acting valve functions through the interaction of two bores 14, 15, each of which completely penetrates the valve body 3 between its two main surfaces 8, 9, with one of the two schematically indicated closures 10, 11 each acting on one side , a vent valve (pressure relief valve 10, 15) and a suction or ventilation valve (vacuum valve 12, 14).
  • the vent valve is formed by closing the bore 15 with the closure 11 attached to the outer main surface 9 of the valve body 3.
  • the closure 11 is designed so that it temperature or air pressure-related excess pressure in the transmission interior 7 initially prevents the escape of air from the bore 15 into the chamber 4. Only when the overpressure in the transmission interior 7 reaches and exceeds a predetermined threshold value does the closure 11 give, the air escapes into the chamber 4 and there is a pressure drop in the transmission interior 7 below the threshold value. In the opposite direction, that is, from the chamber 4 into the transmission interior 7, the closure 11 is, however, completely impermeable to liquids, regardless of any negative pressure in the transmission interior 7.
  • the bore 14 forms, together with the closure 12 attached to the inner main surface 8 of the valve body 3, as a counterpart to the venting valve, a suction valve.
  • the closure 12 withstands a predetermined negative pressure in the housing interior 7 before it yields when a threshold value is exceeded and compensates for the vacuum by sucking in air from the chamber 4 into the transmission interior 7. With the air drawn in, oil located in the chamber 4 is simultaneously sucked into the gearbox interior space 7.
  • the membrane 5 prevents transmission oil from escaping from the chamber 4 into the exterior.
  • the valve body 3 sucks anything when Venting the transmission interior 7 into the chamber 4 oil leaked during ventilation into the transmission interior 7, thus protecting the microporous membrane 5 located above the chamber 4 directly against excessive contamination and indirectly preventing oil from escaping into the exterior and the resulting negative effects Consequences.
  • the membrane 5 prevents the ingress of dirt and dust into the chamber 4 and contamination of the oil in the chamber 4 and thus the entire interior of the transmission 7.
  • valve-forming closures 10, 11 can be implemented in many different ways, for example as ball valves, as folding valves or as sealing lips, as shown in the following figures.
  • FIG. 2 shows an embodiment of the basic principle according to the invention illustrated in FIG. 1.
  • the valve plug 1 of FIG. 2 has a third filter stage with the oil splash guard 25 attached below the valve body 3 in the valve housing 2. All three filter components successively reduce the proportion of oil in the air escaping from the gearbox interior 7 and in this respect represent a three-stage air filter with valve function.
  • a suitably shaped protective cap for example as a perforated plate or the like (not shown) can also be attached, which may be firmly connected to the valve plug 1 or the gear housing 6, around the membrane 5 from mechanical influences or protect against coarse contamination without affecting the air throughput of the membrane 5.
  • the inner oil splash guard 25 which provides a first injection surface when venting a gearbox in operation, implements a first coarse filtering. It prevents spray oil, oil foam or oil mist from acting directly and unhindered on the underside of the valve body 3 (its inner main surface 8), but does not hinder the air flow escaping from the transmission interior 7 for ventilation.
  • the oil splash guard 25 can be designed in many different ways. For example, a grid or a flat wire embroidery can be used. Foam, sintered bronze and similar filter fabrics can also be used.
  • valve body 3 and the membrane 5 are both fixed in a sealed manner in the valve housing 2 by injection, gluing, clamping, overmolding or by similar techniques. Oil collects in the chamber 4 formed by its axially superimposed arrangement, which together with the air flowing out of the transmission interior 7 has passed both the oil splash guard 25 and the valve body 3.
  • Two cap-shaped sealing lips 12, 13 are used as valve-forming closures, which, when interacting with the bores 14, 15, realize two oppositely acting valves.
  • the vent valve is formed by covering the bore 15 with the sealing lip 13 sitting on the outer main surface 9 of the valve body 3, while the suction valve is formed by covering the bore 14 with the sealing lip 12 sitting on the inner main surface 8.
  • the sealing lip 12 acting with a certain preload in the closing direction (inwards or downwards) pe 13 when a predetermined overpressure is reached, the air escapes into the chamber 4 and there is a desired pressure drop in the gearbox interior 7.
  • the sealing lip 12 yields when a predetermined vacuum is reached in the gearbox interior 7, ensures pressure equalization and leads to anything the oil in the chamber 4 back into the gear housing 7.
  • sealing lips 12, 13 are cap-like, each with a peripheral edge 19, 18 and a central one Shaped opening so that they are slipped over the respective main surface 8, 9 for assembly.
  • the central opening of each of the sealing lips 12, 13, on the one hand the central bore 15, 14 of the main surface 8, 9 leading from the corresponding main surface 8, 9 into the interior of the valve body 3 remains uncovered, while that on the edge of the main surface 8, 9 located bore 14, 15 leading out of the valve body 3 is covered.
  • the sealing lips 12, 13 are designed to be rotationally symmetrical with the central opening. This simplifies their assembly, since no preferred orientation has to be observed when fitting over one of the main surfaces 8, 9 of the valve body 3.
  • non-rotationally symmetrical but identical sealing lips 12, 13 can also be used without compromising the function of the valve plug 1.
  • the bores 14, 15 in the valve body are correspondingly diagonally and radially offset from one another.
  • the bore 15 forming part of the vent valve begins in the center of the inner main surface 8, runs diagonally through the valve body 3 and reaches the outer main surface 9 at a certain radial distance from the center of the outer main surface 9, where it passes through the sealing lip 13 is covered.
  • the bore 14 forming part of the intake valve begins with the recess 15 in the center of the outer main surface 9, runs diagonally through the valve body 3 and reaches the inner main surface 8 at a certain radial distance from the center of the inner main surface 8, where it finally ends is covered by the sealing lip 12.
  • the sealing lips 12, 13 are preferably made of an elastomeric plastic, the material properties of which remain constant over long operating times, even at the temperatures usually to be expected in gearboxes.
  • the prestressing of the two sealing lips 12, 13 can be achieved in two ways: on the one hand, it can be achieved in the manufacture of the sealing lips 12, 13 by a preforming such that the main surfaces of the sealing lips 12, 13 lying on the main sides 8, 9 in an acute angle against the respective circumferential edges 19, 18 of the sealing lips 12, 13 are inclined.
  • the sealing lips 12, 13 preformed in this way naturally form a prestress in the respective closure direction when they are slipped over the essentially vertical main surfaces 8, 9 of the valve body 3.
  • a further possibility for generating the prestressing of the sealing lips 12, 13 is the corresponding design of the main surfaces 8, 9 of the valve body as convex planes rising in the direction of the center. As a result, the sealing lips 12, 13 are deflected counter to the closing direction (sealing lip 12 downwards, sealing lip 13 upwards), which in turn achieves a pretension acting in the closing direction.
  • FIG. 3 illustrates a further embodiment of the valve plug 1 according to the invention.
  • the valve body 3 is equipped with pocket-shaped recesses 16, 17 and inserted or screwed into a ventilation opening of a gear housing 6.
  • the secure fastening of the valve plug 1 is achieved by a thread 23, which is attached in a corresponding manner to the outer wall of the valve housing 2 and in the inside of the ventilation opening.
  • the thread 23 is constructed so that the valve plug 1 can be screwed sealingly into the gear housing 6, so that neither air nor liquids can escape from the gear chamber 7 or penetrate there.
  • many other techniques come into question as sealing fastening devices, e.g. Snap locks and tapered, conical valve plugs with sealing rings that are pressed into the ventilation opening and the like.
  • the valve housing 2 can advantageously be made of metal or a suitable plastic.
  • the gear plug 1 in FIG. 3 consists of a valve housing 2 into which an oil splash guard 25, a valve body 3 with obliquely arranged bores 14, 15 and valve-forming sealing lips 12, 13 and a microporous membrane 5 are inserted from the inside to the outside ,
  • the funnel effect of the chamber 4 could be further increased in that the sealing lip 13 is pre-shaped to rise radially outwards.
  • the valve plug could also be used according to the invention with larger deviations from the ideal vertical position.
  • the sealing lip 13 resting on the outer main surface 9 of the valve body 3 must be constructed such that it closes the bore 15 with a prestress and leaves the pocket-shaped recess 16 and the bore 14 uncovered with an opening. It is advantageous to make the pocket-shaped recess 16 and the corresponding opening of the sealing lip 13 as large as possible in order to be able to collect the oil escaping into the chamber 4 as efficiently as possible. Of course, care must be taken that the valve function of the sealing lip 13 is not impaired.
  • a second pocket-shaped recess 17 is provided in the inner main surface 8.
  • The- se has no function at first, but leads to identical configurations of both main surfaces 8, 9 of the valve body 3, so that it works according to the Invention even with exactly the opposite mounting in the valve housing.
  • the side symmetry of the valve body 3 therefore has advantages in terms of both production and assembly, since both main surfaces 8, 9 now have the same effect.
  • valve body 3 Since the circumference of the valve body 3 is generally almost circular due to a preferred cross-sectional shape of the valve housing 2, the sealing lips 12, 13, which are slipped over the main surfaces 8, 9 of the valve body 3, are also of circular circumference.
  • other cross-sectional areas deviating from the ideal circular shape can be selected, such as e.g. rectangular, ellipsoid, or polygonal geometries. The functionality of the valve drop 1 is not affected thereby.
  • the sealing lip 13 which is essential to the invention, in order to ensure the ventilation function, the bore 15 is closed with a pretension that is matched to the maximum pressure desired in the interior of the housing.
  • the pressure conditions in the transmission interior 7 are directly related to the temperatures to be expected during operation of the transmission. Since, for example, temperatures of approx. 150 ° C. generally occur in transmissions in the automotive sector, pressures of approx. 500 to 600 mbar can be expected here.
  • the sealing lip 13 opens in the range from 150 to 200 mbar in order to ensure pressure equalization in the interior 7 of the transmission.
  • the sealing lip 13 which closes the bore 14 on the inner main surface 8 of the valve body 3 also works with a prestress. Its prestress is matched to a maximum negative pressure desired in the transmission interior 7. At correspondingly low pressures, the sealing lip 12 opens and the negative pressure in the transmission interior 7 is compensated for by the air flowing in from the chamber 4.
  • the sealing lips 12, 13 can be attached to the valve body 3 in various ways.
  • the solution shown in FIG. 3 provides a circumferential groove 20 in the circumference of the valve body 3, into which projections 21 which are correspondingly fitted to the circumferential edges 18, 19, of the sealing lips 12, 13 snap into place.
  • the sealing lips 12, 13 can also be glued to the valve body 3. Also, the peripheral edges 18, 19 are not absolutely necessary for fastening the sealing lips 12, 13.
  • the sealing lips could also be realized as disks with a central opening, which are attached to the respective main surfaces 8, 9.
  • the circumferential edges 18, 19 provided in an advantageous embodiment lead to a further advantageous function of the sealing lips 12, 13.
  • the circumferential edges 18, 19 serve as seals between the actual valve body 3 and the inner wall 24 of the valve housing 2.
  • circumferential beads 22 directed in the direction of the inner wall 24, which in the inserted state press against the inner wall 24 of the valve housing 2 provide a seal for the valve body 3 against the valve housing 2.
  • the water inlet pressure was also tested as a measure of the water-repellent properties of a membrane using a membrane made of stretched polytetrafluoroethylene (ePTFE), which was clamped between two test plates. Water pressure could be exerted on the membrane via the lower plate. A pH paper was placed between the top plate and the membrane to detect the passage of water through the membrane. The pressure was increased in small increments and after each increase, 10 seconds were waited before the pH paper was examined. The water inlet pressure is the water pressure at which the pH paper changes color due to water breakthrough. According to the invention, membranes are used which are watertight at a water pressure of 0.6 mbar and which show no signs of water breakthrough even after 60 seconds of exposure to the water pressure.
  • ePTFE stretched polytetrafluoroethylene
  • the membrane 5 initially prevents the oil in the chamber 4, which sometimes sprays from the bore 15 into the chamber 4 at high pressure, from getting into the environment of the transmission.
  • the membrane material is preferably a polymer, for example polyethylene, polypropylene or fluoropolymer. Suitable fluoropolymers are tetrafluoroethylene / (perfluoroalkyl) vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP) and polytetrafluoroethylene (PTFE), with polytetrafluoroethylene, in particular stretched polytetrafluoroethylene (ePTFE) is preferred.
  • PFA perfluoroalkyl) vinyl ether copolymer
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • PTFE polytetrafluoroethylene
  • the membrane material is porous and, depending on the area of application, can
  • a porous membrane 5 made of one of the materials mentioned protects the transmission interior 7 from dust and water ingress from the environment.
  • the air flow rate could at most be restricted by oil located on the inside of the membrane. Due to the interaction according to the invention of the oleophobic membrane 5 with the suction valve starting in the recess 16, the excess oil initially remains in the chamber 4 and is regularly returned to the transmission interior 7 through the suction valve. As a result, there is never enough oil in the chamber 4 to pollute the membrane 5 so sustainably that its air throughput and thus the ventilation of the gearbox or its filter function would be endangered.
  • Both membranes were tested in several successive cycles, one cycle comprising 5 operating hours (temperature rise to approx. 100 to 120 ° C.) and 5 rest hours (temperature drop to room temperature).
  • the first membrane air flow before test: 4.44 ln / h per cm 2 at 12 mbar
  • the gear was allowed to cool and turned over so that the oil was now directly on the valve body 3.
  • the membrane 5 was then removed and its air flow rate measured, giving a value of 4.16 ln / h per cm 2 at 12 mbar.
  • the gear housing 6 with the valve plug 1 was returned to the normal operating position after remaining in the inverted position for 3 weeks.
  • the second membrane air flow rate from test: 4.38 ln / h per cm 2 at 12 mbar
  • the second membrane was then inserted into the valve plug 1 and tested for at least 10 cycles. There was then an air throughput of 4.60 ln / h per cm 2 at 12 mbar for the second membrane.
  • valve plug 1 The construction of the valve plug 1 and the interaction of its filter and valve components means that a gear equipped with a valve plug 1 according to the invention can be transported and stored in any manner without the oil escaping into the environment.
  • the membrane When the inserted valve plug 1 is moved from the usual vertical to a horizontal position, the membrane prevents any oil in the chamber from escaping. The next time the transmission is operated, the oil is returned to the transmission interior 7 through the intake valve.
  • Figure 4 shows a further preferred embodiment of the valve plug 1 with the specifications of the length dimensions of the most important assemblies.
  • a fastening device 26 is shown as an additional element compared to FIGS. 2 and 3, with which the membrane 5 is fastened in / on the valve plug 1.
  • the fastening device 26 essentially consists of a cover with a central opening 33 which is screwed onto an external thread 30 of the valve housing 2 by means of an internal thread 25.
  • the cover forms an inner clamping surface 28, into which the membrane 5 is inserted. By screwing on the cover, the membrane 5 is clamped between the valve housing 2 and the cover and thus fastened. If the membrane 5 is impaired in its function due to wear, it can simply be replaced by unscrewing the fastening device 24.
  • the fastening device 26 can additionally take on a protective function for the membrane 5 in order to protect it from contamination, direct action of water or radiation and, in particular, mechanical impairment.
  • a mechanically stable protective element for example a perforated plate or another protective element made of a stable material such as metal or the like, can be used for this purpose. Care should be taken to ensure that the air openings are sufficiently large or large so that the air throughput of the membrane 5 is not impaired by the protective element.
  • the protective element can be designed such that it only has lateral air openings and thus does not offer direct access to the membrane 5.
  • the fastening device 26 shown in Figure 4 has an outer diameter of 25 mm and an inner diameter which is selected so that the protective device 26 can be screwed sealingly onto the valve housing 2, the outer diameter of which is 20 mm.
  • the height of the fastening device 26 is 15 mm.
  • the fastening device 26, in particular if it also assumes a protective function is connected directly to the gear housing 6.
  • FIG. 4 has elements 29, 31 for fixing the valve body 3 in the valve housing 2.
  • the valve housing 2 forms between the position of the valve body 3 and the oil separator 25 a step 31 - looking into the valve housing 2 from above - into the interior of the valve housing.
  • the stage 31 divides the valve housing 2 into an upper main part with a larger diameter and a lower shaft 32 with a smaller diameter, in which the oil separator 25 is attached.
  • the embodiment in FIG. 4 mentions an outer diameter of 20 mm and an inner diameter of 17 mm for the upper main part of the valve body 3, while the stem 32 has an outer diameter of 12 m.
  • the shaft 32 has an external thread 23 in order to be able to fasten the valve body 3 in the gear housing 6.
  • the stage 31 forms a seat for the valve body 3, which is arranged as a separate component in the valve plug 1.
  • the valve body 3 is advanced in the interior of the valve housing 2 up to the step 31, as a result of which the valve body is fixed in the direction of the stem 32.
  • the valve Body has a height of 6.3 mm in the embodiment shown in Figure 4.
  • a fixing ring 29 is attached over the valve body 3 used, which is in contact with the inner wall of the valve housing 2.
  • the fixing ring 29 has an inner diameter of 17 mm and a height which essentially corresponds to the height of the chamber 4. If the membrane 5 is fastened on / to the valve housing 1 by the fastening device 26, the fixing ring 29 fixes the valve body 3 in its position from above. In this way, vertical displacement of the valve body is prevented and a sufficient size of the chamber 4 is ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • General Details Of Gearings (AREA)

Abstract

L'invention concerne un obturateur (1) à introduire dans un carter de boîte (6), servant à la ventilation de la chambre intérieure (7) de la boîte, constitué d'une membrane (5) oléophobe et perméable à l'air, assurant une étanchéité vers l'extérieur, et d'un corps de soupape (3) orienté vers l'intérieur, la membrane et le corps du soupape formant conjointement une chambre (4). Le corps de soupape (3) forme, par l'intermédiaire d'orifices (12,13) et de fermetures (10, 11), aussi bien une soupape d'évacuation qu'une soupape d'introduction d'air ou d'admission. En présence d'une surpression dans la chambre intérieure de boîte (7), l'air est guidé avec la vapeur d'huile salissante dans la chambre (4) par l'intermédiaire de la soupape d'évacuation d'air située dans le corps de soupape (3). La vapeur d'huile ne peut pas traverser la membrane (5) et par conséquent est recueillie dans la chambre (4). En présence d'une dépression dans la chambre intérieure de boîte (7), l'air recueilli est réintroduit dans la chambre intérieure (7) par l'intermédiaire de la soupape d'admission. Dans un mode de réalisation préféré de l'invention, l'huile ayant pénétré dans la chambre (4) est recueillie dans un évidement (16) en forme de poche, sur le côté supérieur du corps de soupape (3) d'où elle est aspirée et réintroduite dans la chambre intérieure de boîte (7) lors de l'apparition d'une dépression.
PCT/EP2005/001177 2004-03-19 2005-02-04 Soupape de pression pour un carter de boite WO2005098291A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102004013661 2004-03-19
DE102004013661.0 2004-03-19
DE102004046844.3 2004-09-27
DE102004046844A DE102004046844A1 (de) 2004-03-19 2004-09-27 Druckventil für Getriebegehäuse

Publications (1)

Publication Number Publication Date
WO2005098291A1 true WO2005098291A1 (fr) 2005-10-20

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Cited By (5)

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CN102661411A (zh) * 2012-04-23 2012-09-12 盛虎 一种太阳能热水器的双向换气装置
CN108326804A (zh) * 2017-01-20 2018-07-27 苏州宝时得电动工具有限公司 一种电动工具的减速箱压力平衡装置
WO2022041836A1 (fr) * 2020-08-31 2022-03-03 宁德时代新能源科技股份有限公司 Soupape, batterie et dispositif alimenté
EP3858650A4 (fr) * 2018-09-03 2023-01-04 Greyde Avila Dias, Miguel Valve thermodynamique pour rétention de vapeurs et gaz et détente de pression et vide
US11913536B2 (en) * 2021-08-06 2024-02-27 Valmont Industries, Inc. System, method and apparatus for providing a gearbox expansion cap and valve assembly

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JP4870022B2 (ja) 2007-05-16 2012-02-08 住友重機械工業株式会社 減速機
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DE102012018944A1 (de) * 2012-09-26 2014-03-27 Gm Tec Industries Holding Gmbh Vorrichtung zum Be- und Entlüften des Innenraums eines Getriebegehäuses
DE102014208639A1 (de) * 2014-05-08 2015-11-12 Robert Bosch Gmbh Ventilanordnung
DE102014111861B4 (de) * 2014-08-20 2020-12-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Radventileinrichtung mit Schutzkappe
WO2016054409A1 (fr) 2014-10-01 2016-04-07 Donaldson Company, Inc. Évent de réservoir à membrane plissée
DE202014106257U1 (de) * 2014-12-23 2016-01-18 Reinz-Dichtungs-Gmbh Ventil zur Steuerung eines Gasstroms, Flüssigkeitsabscheider, Entlüftungssystem und Verbrennungsmotor mit einem derartigen Ventil
DE102015002320B4 (de) * 2015-02-26 2022-11-24 Gkn Automotive Ltd. Verfahren zum Abscheiden von Öl
DE202015003500U1 (de) * 2015-05-13 2015-06-01 Berghof Fluoroplastic Technology Gmbh Druckausgleichselement mit Druckausgleichsmembran
DE102015217112B4 (de) * 2015-09-08 2021-05-12 Bayerische Motoren Werke Aktiengesellschaft Entlüftung für ein Getriebe
DE202016004440U1 (de) * 2016-07-21 2017-10-24 Berghof Fluoroplastic Technology Gmbh Druckausgleichsvorrichtung mit zwei Trennelementen
DE102016217919A1 (de) 2016-09-19 2018-03-22 Volkswagen Aktiengesellschaft Entlüftungs- und/oder Belüftungsvorrichtung für ein Gehäuse, insbesondere für das Getriebegehäuse eines Kraftfahrzeuges
DE102018111850A1 (de) * 2018-05-17 2019-11-21 Mann+Hummel Gmbh Belüftungsvorrichtung zur Belüftung und/oder Entlüftung eines Maschinengehäuses
DE102019114055A1 (de) * 2019-05-27 2020-12-03 Schaeffler Technologies AG & Co. KG Druckausgleichselement
DE102020106552B3 (de) 2020-03-11 2021-07-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Be- und Entlüftungsanordnung für ein Kraftfahrzeuggetriebe sowie ein Kraftfahrzeuggetriebe
DE102020204436A1 (de) 2020-04-06 2021-10-07 Elringklinger Ag Ventilvorrichtung und elektrochemisches System
CN114122614B (zh) * 2020-08-31 2023-12-08 宁德时代新能源科技股份有限公司 平衡阀、电池及用电设备

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CN102661411A (zh) * 2012-04-23 2012-09-12 盛虎 一种太阳能热水器的双向换气装置
CN108326804A (zh) * 2017-01-20 2018-07-27 苏州宝时得电动工具有限公司 一种电动工具的减速箱压力平衡装置
EP3858650A4 (fr) * 2018-09-03 2023-01-04 Greyde Avila Dias, Miguel Valve thermodynamique pour rétention de vapeurs et gaz et détente de pression et vide
WO2022041836A1 (fr) * 2020-08-31 2022-03-03 宁德时代新能源科技股份有限公司 Soupape, batterie et dispositif alimenté
US12018764B2 (en) 2020-08-31 2024-06-25 Contemporary Amperex Technology Co., Limited Valve, battery and power consumption device
US11913536B2 (en) * 2021-08-06 2024-02-27 Valmont Industries, Inc. System, method and apparatus for providing a gearbox expansion cap and valve assembly

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