WO2007040408A1 - Press-in coupling arrangement - Google Patents

Press-in coupling arrangement Download PDF

Info

Publication number
WO2007040408A1
WO2007040408A1 PCT/NO2006/000340 NO2006000340W WO2007040408A1 WO 2007040408 A1 WO2007040408 A1 WO 2007040408A1 NO 2006000340 W NO2006000340 W NO 2006000340W WO 2007040408 A1 WO2007040408 A1 WO 2007040408A1
Authority
WO
WIPO (PCT)
Prior art keywords
male connector
cast
connector element
socket
internal surface
Prior art date
Application number
PCT/NO2006/000340
Other languages
French (fr)
Inventor
Jan Erik Sangro
Kristoffer Dale
Original Assignee
Kongsberg Automotive As
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 Kongsberg Automotive As filed Critical Kongsberg Automotive As
Publication of WO2007040408A1 publication Critical patent/WO2007040408A1/en

Links

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
    • F16L37/02—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
    • B60T17/043—Brake line couplings, air hoses and stopcocks
    • 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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/035—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed around the spigot end before connection
    • 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
    • F16L37/008—Couplings of the quick-acting type for branching pipes; for joining pipes to walls
    • 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
    • F16L37/025—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined with an inner elastic part pressed against an outer 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
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
    • F16L41/088—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe fixed using an elastic grommet between the extremity of the tube and the wall

Definitions

  • the invention relates to a press-in coupling arrangement for systems involving pressurised media and is concerned particularly with a housing element formed with a cast socket and a male connector element insertable into the cast socket.
  • press-in coupling arrangements comprise a male connector part and a female socket.
  • the female socket may be formed in a cast housing, for example in a valve or a distribution block.
  • the male connector is axially insertable into the female socket and forms a fluid tight seal there-between.
  • the inner contact surfaces of the female socket are machined to provide a good surface finish.
  • the housing elements of coupling arrangements of this type have long been made by a casting process using metals such as brass, zinc alloy or aluminium. Following the casting process, the inner contact surfaces have to be machined to provide the required surface finish value (Ra - surface finish).
  • the present invention provides an advantage over the known press-in coupling arrangements by providing a coupling arrangement comprising a male part and a cast housing formed with a female socket that has inner cast surfaces that do not require post-cast machining.
  • a coupling arrangement comprising a male part and a cast housing formed with a female socket that has inner cast surfaces that do not require post-cast machining.
  • the term 'female socket' includes any suitable hole or port into which a press-in male connector may be inserted.
  • a suitable inner cast surface finish which may be used for forming a seal, is achievable if the inner cast surface is formed with a draft angle.
  • a press-in coupling arrangement for systems involving pressurised media
  • the press-in coupling arrangement comprising a male connector element and a housing element formed with a cast socket, the male connector element being axially insertable into the cast socket and the cast socket comprising a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element, wherein in a pressed-in position a portion of the male connector element is in frictional contact with the first cast internal surface of the socket.
  • the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male connector element.
  • a preferable and practical shape for the first cast inclined internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
  • the first cast internal surface may comprise a curved shape that narrows in the axial direction of insertion of the male connector element.
  • the curved shape is preferably a bowl-shape and may be a paraboliodal shape.
  • the first internal surface may not be a single circumferential form: the first cast internal surface may be a region that is made up from a series of elements disposed circumferentially within the cast socket.
  • the male connector element comprises a first annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and in the pushed-in position the first annular rim is in frictional contact with the first internal cast surface.
  • the male connector element comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim, and in the pushed-in position the first annular seal is in contact with the first internal cast surface.
  • the first annular rim and the first annular seal of the male connector preferably form a fluid tight seal with the first internal cast surface of the socket.
  • the cast socket preferably comprises a second inclined cast internal surface that extends towards the axis of the cast socket in the axial direction of insertion of the male connector element and wherein in the pressed-in position the male connector element is also in frictional contact with the second inclined cast internal surface, the second inclined cast internal surface being located between the open end of the socket and the first inclined cast internal surface.
  • the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and wherein in the pressed-in position the male connector element is in frictional contact with the second inclined cast internal surface.
  • the draft angle of the second inclined cast internal surface is preferably a frustro- conical form that narrows in the axial direction of insertion of the male connector element.
  • the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface.
  • the male connector element preferably comprises a second annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and wherein in the pressed-in position the second annular rim is in frictional contact with the second internal cast surface.
  • the male connector element comprises a second annular seal that extends in a direction radially outward from the longitudinal axis of the male connector element, the first annual rim being axially situated between second annular seal and the distal end of the male connector element, and wherein in the pressed-in position the second annular seal is in contact with the second internal cast surface.
  • the male connector element also comprises a second annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, wherein in the pressed-in position the second annular rim is in frictional contact with the second internal cast surface of the socket.
  • the male connector element preferably comprises a second annular seal that extends in a direction radially outward from the longitudinal axis of the male connector element, the first annual rim being axially situated between second annular seal and the distal end of the male connector element, and wherein in the pressed-in position the second annular seal is in contact with the second internal cast surface of the socket.
  • a cast socket for a press-in coupling arrangement for systems involving pressurised media comprising a male connector element and a housing element formed with the cast socket, the male connector element being axially insertable into the cast socket
  • the cast socket comprises a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and in a pressed-in position a portion of the male connector element is in frictional contact with the first internal cast surface of the socket.
  • the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male connector element.
  • the first cast internal surface preferably is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
  • the first cast internal surface may comprise a draft angle of 2 degrees or more.
  • the first cast internal surface preferably comprises a draft angle of 2 to 5 degrees.
  • the first cast internal surface comprises a curved substantially bowl- shape form that narrows in the axial direction of insertion of the male connector element.
  • the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element.
  • the second inclined cast internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
  • the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface.
  • a male connector element for a press-in coupling arrangement for systems involving pressurised media
  • the press-in coupling arrangement comprising the male connector element and a housing element formed with a socket
  • the male connector element comprises a first annular rim and a second annular rim that each extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, wherein the first annular rim is disposed between the distal end of the male connector and the second annular rim.
  • the male connector element preferably comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim.
  • the male connector element comprises a second annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the second annular seal being axially situated between the first annular rim and the second annular rim.
  • the second annular rim is preferably deformable, and the arrangement is such that in use the second annular element deforms as the male connector is pressed into the socket.
  • the second annular rim is deformable such that in the pressed-in position the second annular rim is pressed towards the longitudinal axis of the male connector by the second inclined cast internal surface of the socket
  • Figure 1 is a side view of a male connector element which forms one part of a press- in coupling arrangement for systems involving pressurised media ;
  • Figure 2 is a cross-section view of a cast socket of a housing which forms a second part of the press-in coupling arrangement
  • Figure 3 shows an embodiment of the male connector element for a press-in coupling arrangement according to the present invention.
  • Figures 1 , 2 and 3 show two elements that form a press-in coupling arrangement for systems involving pressurised media, such as air brake systems on commercial vehicles.
  • a male connector element 2 of tubular form comprising a first annular rim 4 and a second annular rim 6 that each extend in a direction away from the distal end 8 of the male connector element and in a direction radially outwards from a longitudinal axis 10.
  • the first annular rim 4 is in the form of a barb and is disposed between the distal end 8 of the male connector element 2 and the second annular rim 6.
  • the second annular rim 6 is in the form of a deformable barb having a cross-sectional thickness that is significantly less than the cross-sectional thickness of the first annular rim 4.
  • the male connector 2 also comprises a first annular seal 12 in the form of an O-ring and a second annular seal 14 in the form of an O-ring.
  • the first annular seal 12 is axially situated between the distal end 8 and the first annual rim 4.
  • the second annular seal 14 is axially situated between the first annular rim 4 and the second annular rim 6.
  • Each of annular seals 12, 14 is held within respective circumferential grooves formed in the male connector element 2.
  • a substantially cup-shaped cast socket 16 for the press-in coupling arrangement for the press-in coupling arrangement.
  • the male connector 2 is axially insertable into the socket 16 in a direction 17.
  • the pressurised media system may comprise a plurality of such coupling arrangements.
  • the cast socket 16 may be formed in a cast valve or distribution block used within the system.
  • the cast valve or distribution block may be a cast metal such as an aluminium or a zinc alloy.
  • the cast socket 16 comprises a first frustro-conical internal surface 18 and a second frustro-conical internal surface 20.
  • the first frustro-conical internal surface 18 has a draft angle 'A'.
  • the draft angle 'A' may be 2 degrees or more, but preferably the draft angle 'A' will be in the range from 2 to 5 degrees.
  • the draft angle 'B' may be 2 degrees or less.
  • it is preferably that the internal surface having the lesser draft angle is disposed between the opening 24 of the socket 16 and the internal surface having the greater draft angle.
  • a circumferential sloped surface 22 is formed at the opening 24 of the socket 16.
  • the first and second internal surfaces 18, 20 each have a surface finish Ra value of about 3.2. Such a value is achievable without the need for post-cast machining due to the draft angles on the inner cast surfaces.
  • the cast socket 16 is formed with a central port 23 that provides fluid communication between the male connector element and the pressurised media.
  • the first annual seal 12 and the first annular rim 4 are in contact with the first inclined internal surface 18: the main function of this arrangement is to provide a fluid seal function there-between.
  • the second annular seal 14 and the second annular rim 6 are in frictional contact with the second inclined internal surface 20: the main function of the second annular rim 6 is to secure together the male connector 2 and the socket 16.
  • the male connector 2 is axially insertable into the socket 16 with a mean press-in force value of 3200 N. Such a press-in force is sufficient to deform the second annular rim 6 such that in the pressed-in position the second annular rim6 is pressed towards the longitudinal axis of the male connector 2 by the second inclined cast internal surface 20 of the socket 16.
  • the first annular rim 4 When the male connector 2 is inserted in the socket 16, the first annular rim 4 will press firmly against the first inclined internal surface 18 of the socket 16 and the second annular ring 6 will be in firm frictional contact with the second inclined internal surface 20.
  • the deformation of the second annular ring 6 as it is inserted into the socket 16, creates a holding force which is sufficient to hold the male connector 6 and the socket 16 together.
  • a holding clip or any other holding device to keep the two parts of the coupling together, i.e. the coupling is self-holding.
  • the first and second included internal cast surfaces 18, 20 of the present invention provide a suitable inner cast surface finish, which may be used for forming a seal.
  • the surface finish is achievable because the inner cast surfaces are formed with a draft angle.
  • the first and second internal surfaces 18, 20 each have a surface finish Ra value of about 3.2. Such a value is obtained without the need for post-cast machining.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Abstract

A press-in coupling arrangement including a cast socket (16) that comprises a first frustro-conical internal surface (18) and a second frustro-conical internal surface (20). The first frustro-conical internal surface (18) has a draft angle 'A'. The draft angle 'A' may be 2 degrees or more, but preferably the draft angle 'A' will be in the range from 2 to 5 degrees. The draft angle 'B' may be 2 degrees or less. Generally, it is preferably that the internal surface having the lesser draft angle is disposed between the opening (24) of the socket (16) and the internal surface having the greater draft angle. A circumferential sloped surface (22) is formed at the opening (24) of the socket (16). The first and second internal surfaces (18, 20) each have a surface finish Ra value of about 3.2. Such a value is achievable without the need for post-cast machining due to the draft angles on the inner cast surfaces.

Description

Press-in Coupling Arrangement
The invention relates to a press-in coupling arrangement for systems involving pressurised media and is concerned particularly with a housing element formed with a cast socket and a male connector element insertable into the cast socket.
Background of the Invention
In known systems involving pressurised media, such as air brake systems on commercial vehicles, press-in coupling arrangements comprise a male connector part and a female socket. The female socket may be formed in a cast housing, for example in a valve or a distribution block. The male connector is axially insertable into the female socket and forms a fluid tight seal there-between. In order to achieve the fluid tight seal, the inner contact surfaces of the female socket are machined to provide a good surface finish. The housing elements of coupling arrangements of this type have long been made by a casting process using metals such as brass, zinc alloy or aluminium. Following the casting process, the inner contact surfaces have to be machined to provide the required surface finish value (Ra - surface finish). A typical surface finish value is about Ra = 3.2.
Disclosure of the Invention
The present invention provides an advantage over the known press-in coupling arrangements by providing a coupling arrangement comprising a male part and a cast housing formed with a female socket that has inner cast surfaces that do not require post-cast machining. It shall be appreciated that the term 'female socket' includes any suitable hole or port into which a press-in male connector may be inserted. We have discovered that a suitable inner cast surface finish, which may be used for forming a seal, is achievable if the inner cast surface is formed with a draft angle.
According to a first aspect of the present invention there is provided a press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising a male connector element and a housing element formed with a cast socket, the male connector element being axially insertable into the cast socket and the cast socket comprising a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element, wherein in a pressed-in position a portion of the male connector element is in frictional contact with the first cast internal surface of the socket. Preferably, the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male connector element.
A preferable and practical shape for the first cast inclined internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element. Alternatively, the first cast internal surface may comprise a curved shape that narrows in the axial direction of insertion of the male connector element. The curved shape is preferably a bowl-shape and may be a paraboliodal shape. However, it shall be appreciate that other shapes or forms having an inclined or draft angle may be usable. Also, the first internal surface may not be a single circumferential form: the first cast internal surface may be a region that is made up from a series of elements disposed circumferentially within the cast socket.
Preferably the male connector element comprises a first annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and in the pushed-in position the first annular rim is in frictional contact with the first internal cast surface.
Preferably, the male connector element comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim, and in the pushed-in position the first annular seal is in contact with the first internal cast surface.
In the pushed-in position the first annular rim and the first annular seal of the male connector preferably form a fluid tight seal with the first internal cast surface of the socket.
The cast socket preferably comprises a second inclined cast internal surface that extends towards the axis of the cast socket in the axial direction of insertion of the male connector element and wherein in the pressed-in position the male connector element is also in frictional contact with the second inclined cast internal surface, the second inclined cast internal surface being located between the open end of the socket and the first inclined cast internal surface.
Preferably the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and wherein in the pressed-in position the male connector element is in frictional contact with the second inclined cast internal surface. The draft angle of the second inclined cast internal surface is preferably a frustro- conical form that narrows in the axial direction of insertion of the male connector element.
Preferably, the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface.
The male connector element preferably comprises a second annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and wherein in the pressed-in position the second annular rim is in frictional contact with the second internal cast surface.
It is preferably that the male connector element comprises a second annular seal that extends in a direction radially outward from the longitudinal axis of the male connector element, the first annual rim being axially situated between second annular seal and the distal end of the male connector element, and wherein in the pressed-in position the second annular seal is in contact with the second internal cast surface.
Preferably, the male connector element also comprises a second annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, wherein in the pressed-in position the second annular rim is in frictional contact with the second internal cast surface of the socket.
The male connector element preferably comprises a second annular seal that extends in a direction radially outward from the longitudinal axis of the male connector element, the first annual rim being axially situated between second annular seal and the distal end of the male connector element, and wherein in the pressed-in position the second annular seal is in contact with the second internal cast surface of the socket.
According to a second aspect of the present invention there is provided a cast socket for a press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising a male connector element and a housing element formed with the cast socket, the male connector element being axially insertable into the cast socket, wherein the cast socket comprises a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and in a pressed-in position a portion of the male connector element is in frictional contact with the first internal cast surface of the socket. Preferably, the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male connector element.
The first cast internal surface preferably is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
The first cast internal surface may comprise a draft angle of 2 degrees or more.
The first cast internal surface preferably comprises a draft angle of 2 to 5 degrees.
Alternatively, the first cast internal surface comprises a curved substantially bowl- shape form that narrows in the axial direction of insertion of the male connector element.
In an embodiment of the invention, the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element.
Preferably, the second inclined cast internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
It is preferable that the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface.
According to a third aspect of the present invention there is provided a male connector element for a press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising the male connector element and a housing element formed with a socket, wherein the male connector element comprises a first annular rim and a second annular rim that each extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, wherein the first annular rim is disposed between the distal end of the male connector and the second annular rim.
The male connector element preferably comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim.
Preferably, the male connector element comprises a second annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the second annular seal being axially situated between the first annular rim and the second annular rim.
The second annular rim is preferably deformable, and the arrangement is such that in use the second annular element deforms as the male connector is pressed into the socket.
It is preferable that the second annular rim is deformable such that in the pressed-in position the second annular rim is pressed towards the longitudinal axis of the male connector by the second inclined cast internal surface of the socket
It shall be appreciated that one or more of the features described above regarding the second and third aspects of the invention may be used in conjunction with the features of the first aspect of the invention.
Brief Description of the Drawings
A specific embodiment of the invention and variants thereof will now be described by way of example with reference to the accompanying drawing, in which :-
Figure 1 is a side view of a male connector element which forms one part of a press- in coupling arrangement for systems involving pressurised media ;
Figure 2 is a cross-section view of a cast socket of a housing which forms a second part of the press-in coupling arrangement; and
Figure 3 shows an embodiment of the male connector element for a press-in coupling arrangement according to the present invention.
Description of the Specific Embodiments
Figures 1 , 2 and 3 show two elements that form a press-in coupling arrangement for systems involving pressurised media, such as air brake systems on commercial vehicles.
With reference to the Figures 1 and 3 there is shown a male connector element 2 of tubular form comprising a first annular rim 4 and a second annular rim 6 that each extend in a direction away from the distal end 8 of the male connector element and in a direction radially outwards from a longitudinal axis 10. The first annular rim 4 is in the form of a barb and is disposed between the distal end 8 of the male connector element 2 and the second annular rim 6. The second annular rim 6 is in the form of a deformable barb having a cross-sectional thickness that is significantly less than the cross-sectional thickness of the first annular rim 4. The male connector 2 also comprises a first annular seal 12 in the form of an O-ring and a second annular seal 14 in the form of an O-ring. The first annular seal 12 is axially situated between the distal end 8 and the first annual rim 4. The second annular seal 14 is axially situated between the first annular rim 4 and the second annular rim 6. Each of annular seals 12, 14 is held within respective circumferential grooves formed in the male connector element 2.
With reference to the Figure 2 there is shown a substantially cup-shaped cast socket 16 for the press-in coupling arrangement. The male connector 2 is axially insertable into the socket 16 in a direction 17. In the pressed-in position the male connector 2 and socket 16 form the press-in coupling arrangement. The pressurised media system may comprise a plurality of such coupling arrangements. The cast socket 16 may be formed in a cast valve or distribution block used within the system. The cast valve or distribution block may be a cast metal such as an aluminium or a zinc alloy.
The cast socket 16 comprises a first frustro-conical internal surface 18 and a second frustro-conical internal surface 20. The first frustro-conical internal surface 18 has a draft angle 'A'. The draft angle 'A' may be 2 degrees or more, but preferably the draft angle 'A' will be in the range from 2 to 5 degrees. The draft angle 'B' may be 2 degrees or less. Generally, it is preferably that the internal surface having the lesser draft angle is disposed between the opening 24 of the socket 16 and the internal surface having the greater draft angle. A circumferential sloped surface 22 is formed at the opening 24 of the socket 16. The first and second internal surfaces 18, 20 each have a surface finish Ra value of about 3.2. Such a value is achievable without the need for post-cast machining due to the draft angles on the inner cast surfaces. The cast socket 16 is formed with a central port 23 that provides fluid communication between the male connector element and the pressurised media.
In the pressed-in position, the first annual seal 12 and the first annular rim 4 are in contact with the first inclined internal surface 18: the main function of this arrangement is to provide a fluid seal function there-between. The second annular seal 14 and the second annular rim 6 are in frictional contact with the second inclined internal surface 20: the main function of the second annular rim 6 is to secure together the male connector 2 and the socket 16. The male connector 2 is axially insertable into the socket 16 with a mean press-in force value of 3200 N. Such a press-in force is sufficient to deform the second annular rim 6 such that in the pressed-in position the second annular rim6 is pressed towards the longitudinal axis of the male connector 2 by the second inclined cast internal surface 20 of the socket 16. When the male connector 2 is inserted in the socket 16, the first annular rim 4 will press firmly against the first inclined internal surface 18 of the socket 16 and the second annular ring 6 will be in firm frictional contact with the second inclined internal surface 20. The deformation of the second annular ring 6 as it is inserted into the socket 16, creates a holding force which is sufficient to hold the male connector 6 and the socket 16 together. Thus, there is no need for a holding clip or any other holding device to keep the two parts of the coupling together, i.e. the coupling is self-holding.
The first and second included internal cast surfaces 18, 20 of the present invention provide a suitable inner cast surface finish, which may be used for forming a seal. The surface finish is achievable because the inner cast surfaces are formed with a draft angle. The first and second internal surfaces 18, 20 each have a surface finish Ra value of about 3.2. Such a value is obtained without the need for post-cast machining.

Claims

1. A press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising a male connector element and a housing element formed with a cast socket, the male connector element being axially insertable into the cast socket and the cast socket comprising a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element, wherein in a pressed-in position a portion of the male connector element is in frictional contact with the first cast internal surface of the socket.
2. A press-in coupling as claimed in claim 1, wherein the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male connector element.
3. A press-in coupling as claimed in claim 1 or claim 2, wherein the first cast inclined internal surface comprises a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
4. A press-in coupling as claimed in claim 1 or claim 2, wherein the first cast internal surface is a curved substantially bowl-shape form that narrows in the axial direction of insertion of the male connector element.
5. A press-in coupling arrangement as claimed in any one of the preceding claims, wherein the male connector element comprises a first annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and wherein in the pressed-in position the first annular rim is in frictional contact with the first internal cast surface.
6. A press-in coupling arrangement as claimed in claim 5, wherein the male connector element comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim, and wherein in the pressed-in position the first annular seal is in contact with the first internal cast surface.
7. A press-in coupling arrangement as claimed in any one of the claims 1 to 6, wherein the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and wherein in the pressed-in position the male connector element is in frictional contact with the second inclined cast internal surface.
8. A press-in coupling arrangement as claimed in claim 7, wherein the draft angle of the second inclined cast internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
9. A press-in coupling arrangement as claimed in claim 7 or claim 8, wherein the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface .
10. A press-in coupling arrangement as claimed in claim any one of the preceding claims 7 to 9, wherein the male connector element comprises a second annular rim that extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, and wherein in the pressed-in position the second annular rim is in frictional contact with the second internal cast surface.
11. A press-in coupling arrangement as claimed in claim any one of the preceding claims 7 to 10, wherein the male connector element comprises a second annular seal that extends in a direction radially outward from the longitudinal axis of the male connector element, the first annual rim being axially situated between second annular seal and the distal end of the male comiector element, and wherein in the pressed-in position the second annular seal is in contact with the second internal cast surface.
12. A cast socket for a press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising a male connector element and a housing element formed with the cast socket, the male connector element being axially insertable into the cast socket, wherein the cast socket comprises a first cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element and in a pressed-in position a part of the male connector element is in frictional contact with the first internal cast surface.
13. A cast socket as claimed in claim 12, wherein the first cast internal surface comprises an inclined surface that narrows in the axial direction of insertion of the male comiector element.
14. A cast socket as claimed in claim 12 or claim 13, wherein the first cast internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
15. A cast socket as claimed in any one of claims 12 to 14, wherein the first cast internal surface comprises a draft angle of 2 degrees or more.
16. A cast socket as claimed in any one of claims 12 to 15, wherein the first cast internal surface comprises a draft angle of 2 to 5 degrees.
17. A cast socket as claimed in claim 12 or claim! 3, wherein the first cast internal surface comprises a curved substantially bowl-shape form that narrows in the axial direction of insertion of the male connector element.
18. A cast socket as claimed in any one of claims 12 to 17, wherein the cast socket comprises a second cast internal surface that extends towards the longitudinal axis of the cast socket in the axial direction of insertion of the male connector element.
19. A cast socket as claimed in claim 18, wherein the draft angle of the second inclined cast internal surface is a frustro-conical form that narrows in the axial direction of insertion of the male connector element.
20. A press-in coupling arrangement as claimed in claim 18 or claim 19, wherein the draft angle of the second inclined cast internal surface is less than or equal to the draft angle of the first inclined cast internal surface.
21. A cast socket as claimed in any one of claims 18, 19 and 20, wherein the second cast internal surface comprises a draft angle of 2 degrees or less.
22. A male connector element for a press-in coupling arrangement for systems involving pressurised media, the press-in coupling arrangement comprising the male connector element and a housing element formed with a socket, wherein the male connector element comprises a first annular rim and a second annular rim that each extends in a direction away from the distal end of the male connector element and radially outwards from the longitudinal axis of the male connector element, wherein the first annular rim is disposed between the distal end of the male connector and the second annular rim.
23. A male connector element as claimed in claim 21, wherein the male connector element comprises a first annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the first annular seal being axially situated between the distal end of the male connector element and the first annual rim.
24. A male connector element as claimed in claim 22 or 23, wherein the male connector element comprises a second annular seal that extends in a direction radially outwards from the longitudinal axis of the male connector element, the second annular seal being axially situated between the first annular rim and the second annular rim.
25. A male connector element as claimed in any one of claims 22 to 24, wherein the second annular rim is deformable, and the arrangement is such that in use the second annular element deforms as the male connector is pressed into the socket.
26. A male connector element as claimed in any one of claims 22 to 25, wherein the second annular rim is deformable such that in the pressed-in position the second annular rim is pressed towards the longitudinal axis of the male connector by the second inclined cast internal surface of the socket.
PCT/NO2006/000340 2005-10-05 2006-10-04 Press-in coupling arrangement WO2007040408A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502194A SE0502194L (en) 2005-10-05 2005-10-05 Press fitting device
SE0502194-4 2005-10-05

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WO2007040408A1 true WO2007040408A1 (en) 2007-04-12

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015120834A1 (en) * 2014-02-12 2015-08-20 Fele Gmbh & Co. Kg Fitting for a brake line
US11156314B2 (en) * 2016-02-15 2021-10-26 Hamilton Sundstrand Corporation Oval o-ring groove
WO2023041240A1 (en) * 2021-09-17 2023-03-23 Robert Bosch Gmbh Seal arrangement in the cooling circuit of an e-axle module
GB2621357A (en) * 2022-08-09 2024-02-14 Salts Healthcare Ltd An ostomy drainage system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339949A (en) * 1965-10-21 1967-09-05 Crawford Fitting Co Tube coupling
USRE27342E (en) * 1970-11-03 1972-04-25 Valenziano pipe joint
FR2403497A1 (en) * 1977-09-16 1979-04-13 Tuyaux Bonna Sealing ring for pipeline joint - has pear-shaped cross=section which eliminates any tendency of seal to roll during assembly
WO2000001972A1 (en) * 1998-07-02 2000-01-13 Bidco Plastic Extrusion, Inc. Co-extruded dual durometer hardness pipe gasket
NL1017407C2 (en) * 2001-02-20 2002-08-22 Hollandsche Betongroep Nv The coupling system comprises insert part and part for its reception. Either one or other part has ring-shaped groove, in which O-ring is fitted

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339949A (en) * 1965-10-21 1967-09-05 Crawford Fitting Co Tube coupling
USRE27342E (en) * 1970-11-03 1972-04-25 Valenziano pipe joint
FR2403497A1 (en) * 1977-09-16 1979-04-13 Tuyaux Bonna Sealing ring for pipeline joint - has pear-shaped cross=section which eliminates any tendency of seal to roll during assembly
WO2000001972A1 (en) * 1998-07-02 2000-01-13 Bidco Plastic Extrusion, Inc. Co-extruded dual durometer hardness pipe gasket
NL1017407C2 (en) * 2001-02-20 2002-08-22 Hollandsche Betongroep Nv The coupling system comprises insert part and part for its reception. Either one or other part has ring-shaped groove, in which O-ring is fitted

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015120834A1 (en) * 2014-02-12 2015-08-20 Fele Gmbh & Co. Kg Fitting for a brake line
US11156314B2 (en) * 2016-02-15 2021-10-26 Hamilton Sundstrand Corporation Oval o-ring groove
WO2023041240A1 (en) * 2021-09-17 2023-03-23 Robert Bosch Gmbh Seal arrangement in the cooling circuit of an e-axle module
GB2621357A (en) * 2022-08-09 2024-02-14 Salts Healthcare Ltd An ostomy drainage system

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