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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
  • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
  • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/02—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined
  • F16L37/04—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined with an elastic outer part pressing against an inner part by reason of its elasticity
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/02—Energy absorbers; Noise absorbers
  • F16L55/033—Noise absorbers
  • F16L55/0331—Noise absorbers by inserting an elongated element in the pipe
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/04—Devices damping pulsations or vibrations in fluids
  • F16L55/041—Devices damping pulsations or vibrations in fluids specially adapted for preventing vibrations
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining

Definitions

• Noise attenuator for hydraulic fluid line article comprising this attenuator, pipe comprising this article and method of assembly.
• the present invention relates to a noise attenuator for hydraulic fluid conduit, an article comprising the attenuator, a conduit comprising this article and a method of assembly.
• the pipe is connected to an oil pump of an automatic transmission of the motor vehicle, this pump providing the hydraulic pressure necessary for a gear change.
• the internal pipe may be constituted by a hose made of a synthetic or metallic material, comprising small holes for the passage of the fluid flowing in the attenuator.
• the noise attenuator is made of a metallic material and comprises two superimposed helical windings, between which the hydraulic fluid can infiltrate.
• the noise attenuator is therefore relatively complex to manufacture.
• the invention aims in particular to provide a noise attenuator whose manufacture is simplified.
• the invention relates to a noise attenuator for hydraulic fluid conduit, characterized in that it is made of a fluid porous material for circulating in the noise attenuator.
• porous means to a fluid in the present description, a material having a structure having, between its molecules, natural interstices allowing the passage of the fluid.
• the fluid flowing in the attenuator according to the invention infiltrates by the natural interstices of the structure of the porous material. It is therefore not necessary to drill or use a metal helical coil.
• the porous material is a porous synthetic material.
• the material has a density of between 1.5 and 2.15.
• the synthetic material is porous polytetrafluoroethylene (PTFE).
• the noise attenuator is generally connected directly to a delivery pipe of a hydraulic pump, in order to attenuate the operating sound.
• the subject of the invention is also an article comprising a noise attenuator as described above, characterized in that it comprises a connection member to a tubing comprising a section-narrowing portion in the direction going from the attenuator to the tubing, the member having a tip connected to the noise attenuator and a radially expanding bell for being snapped onto the sectional narrowing portion of the tubing.
• the radially expanding bell comprises a tubular skirt having axial end slots facilitating its elastic radial expansion.
• An article according to the invention may further comprise one or more of the features according to which: the connecting member comprises an external surface shaped for fitting a flexible hose and, on this external surface, retaining means axial hose; the tubing having an internal fluid passage section, the connecting member comprises a section matching channel having a section gradually varying from the fluid passage section in the nozzle to the fluid passage section in the bell radial expansion; the tip is fluted for its connection to the noise attenuator.
• the invention further relates to a hydraulic fluid line comprising an article as described above and a flexible pipe, the pipe being intended to be connected to a pipe having a section-shrinking portion in the direction from the attenuator towards the tubulure, this connection occurring by snap-fitting of the radially expanding bell on the section-narrowing portion of the tubing.
• a pipe according to the invention may further comprise an outer sleeve for locking the flexible pipe on the pipe, the outer sleeve being able to be crimped around the flexible pipe.
• the invention also relates to a method of assembling a hydraulic fluid line as described above to a tubing having a portion of narrowing section in the direction from the attenuator to the tubing, characterized in that it comprises the following steps: - connection of the connecting member of the article to the tubing by snapping the radially expanding bell on the section-narrowing portion of the tubing, fitting the flexible pipe around the article and tubing.
• An assembly method according to the invention may further include a step of locking the flexible hose to the tubing by crimping an outer sleeve around the hose.
• FIG. 1 is a sectional view of a hydraulic fluid line for a vehicle automobile according to the invention
• Figures 2 and 3 are perspective views of a connecting member according to the invention
• Figure 4 is a sectional view of the connecting member of Figures 2 and 3.
• a hydraulic fluid line for a motor vehicle. This pipe is designated by the general reference 10.
• the pipe 10 comprises a flexible pipe 12 made of an elastomeric material, for example rubber.
• the pipe 10 also comprises an article 14 including a noise attenuator 16 and a connection member 18.
• the noise attenuator 16 is constituted by a flexible tubular element which is made of a material porous to the hydraulic fluid intended to circulate in the pipe.
• the porous material is, for example, porous polytetrafluoroethylene (PTFE).
• Porous means hydraulic fluid, a material having a structure having, between its molecules, natural interstices through which the hydraulic fluid can infiltrate.
• the porous material of the noise attenuator 16 is particularly characterized by its density. Experimental tests have revealed that this physical quantity is closely related to the porous properties of the material, in particular to its permeability but also to the number and size of its pores. -AT-
• the density of the porous material should preferably be between 1.5 and 2.15, in order to obtain a noise attenuator having properties of optimum rigidity and porosity for its application as a softener of noise.
• a noise attenuator made of a porous material having a relatively low density, for example less than 1.5 has a relatively high flexibility. Because of this significant flexibility, the attenuator is likely to deform under the effect of pressure. Such deformations may be in particular at the origin of a frequency shift of attenuator noise attenuation frequencies.
• a noise attenuator made of a porous material having a relatively high density for example greater than 2.15
• density greater than 2.15 because of this relatively low porosity, the noise attenuator is no longer sufficiently effective in terms of noise attenuation.
• density values between 1.5 and 2.15 of the porous material the noise attenuator has optimum properties of rigidity and porosity.
• the attenuator may further comprise bores made in the tubular element. These bores have dimensions, shapes and positions on the tubular element chosen so as to allow attenuation of the amplitude of the noise at this predetermined frequency.
• the connecting member 18 is connected to the noise attenuator 16 by a splined tip 20 which is inserted into the internal channel of the noise attenuator 16. It can be seen in FIG. widening the noise attenuator, so that the section of the internal channel of the noise attenuator substantially corresponds to that of the internal channel of the nozzle.
• the pipe 10 is intended to be connected to a pipe 22.
• the pipe 22 is rigid and is made for example of an alloy comprising essentially steel.
• the rigid tubing 22 is a discharge outlet of the hydraulic fluid of a hydraulic pump (not shown) of the motor vehicle.
• the tubing 22 comprises a portion 23 with a narrowing section in the direction from the attenuator to the tubing.
• the connecting member 18 comprises, in alignment with the nozzle 20, a bell 24 radially expanded to be snapped onto the portion 23 to narrow the section of the rigid tubing.
• the radially expanding bell 24 comprises a tubular skirt slotted at its end by axial slots 30 so that the tubular skirt 26 is elastically expandable.
• the tubular skirt 26 is divided into four portions 28A, 28B, 28C, 28D.
• the interior of the bell 24 delimits a volume complementary to the external volume of the portion 23 of the tubing, with in particular an internal extra thickness 29A, 29B, 29C, 29D at each end of the portions 28A, 28B, 28C, 28D, which is intended to match the narrowing section of the tubing.
• the connecting member 18 comprises, between the radial expansion bell 24 and the nozzle 20, an adaptation channel. of section 31 (shown only on the section of Figure 1 having a section gradually varying from the fluid passage section in the nozzle 20 to the fluid passage section in the radial expansion bell 24.
• the adaptation channel 31 has a section which decreases continuously from the internal section of the tubing 22 to the internal section of the nozzle 20.
• the radial expansion bell 24 may comprise, on its outer face, at least one projecting element 25 forming axial retention means of the flexible pipe.
• the pipe 10 comprises an outer sleeve 32 for locking the pipe 12, the outer sleeve 32 being fixed for example by crimping around the flexible pipe 12 and the pipe.
• connection member 18 is connected to the tubing 22 by snapping the radial expansion bell 24 onto the portion 23 of the tubing 22.
• the flexible pipe 12 is wired around the article 14 and the rigid pipe 22 connected to each other.
• the flexible pipe 12 is held axially around the article 20 and the rigid pipe 22. Conversely, the flexible pipe 12 prevents radial expansion of the pipe. bell 24.
• the flexible pipe 12 is blocked on the pipe 22 by crimping an outer sleeve 32 around the flexible pipe 12. It can be seen that, thanks to the connecting member 18, the connection of the pipe 10 to the tubing 22 of the pump is facilitated because at most only one crimping operation is required.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pipe Accessories (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37698899

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (16)

• 2006
  • 2006-07-13 FR FR0652982A patent/FR2903756B1/fr active Active
• 2007
  • 2007-07-13 WO PCT/FR2007/051662 patent/WO2008007036A2/fr not_active Ceased
  • 2007-07-13 EP EP07823583A patent/EP2041473A2/de not_active Withdrawn
  • 2007-07-13 US US12/309,233 patent/US20110048846A1/en not_active Abandoned
  • 2007-07-13 MX MX2009000473A patent/MX2009000473A/es not_active Application Discontinuation

Non-Patent Citations (1)

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