JP4529133B2 - Quick connector - Google Patents

Description

  The present invention relates to a quick connector used for connecting automobile piping, for example.

  A connector for connecting a pipe body and a hose is used for a fluid piping structure configured by connecting a pipe body and a hose. Such a connector has a cylindrical connector housing in which a connecting portion to which a hose is connected is formed on one side in the axial direction, and the connection between the pipe body and the connector is, for example, the insertion side of the pipe body An annular engagement projection is formed on the outer peripheral surface to form an insertion end, and a retainer means for snap engagement is provided on the other axial side of the connector housing to place the connector in a quick connection type, and a pipe body Is inserted into the connector housing through the opening on the other side end in the axial direction, and the retainer means and the annular engagement protrusion are snap-engaged to keep the pipe body and the connector from coming off. . As a retainer means used for the quick connection type quick connector, a pair of engagement slits are provided on the other side in the axial direction of the connector housing so as to be opposed to each other in the radial direction, and a U shape having a pair of engagement arms or Using a substantially U-shaped wire retainer (for example, a wire retainer), connect the wire retainer to the other side in the axial direction of the connector housing so that the pair of engagement arms enter the engagement slit and sandwich the connector housing. Attaching to the outer periphery on the other side in the axial direction is known (see, for example, Patent Document 1). By adopting such a retainer means, even when the connector has a relatively large diameter, sufficient attachment stability of the retainer to the connector housing can be ensured.

JP 2003-21287 A

  By the way, in order for the pipe body to be firmly retained by the wire retainer, the engagement arm of the wire retainer sufficiently protrudes into the connector housing and engages with the annular engagement protrusion of the pipe body over a long range. It is considered necessary. However, even if the engagement arm is engaged with the annular engagement protrusion over a long range, depending on the use environment, the engagement between the pipe body and the wire retainer is released and the pipe body is relatively disengaged from the connector. It may be in a state of being stuck.

  Therefore, an object of the present invention is to provide a quick connector having a novel structure in which a pipe body is firmly retained by a wire retainer.

  In order to achieve this object, the quick connector of the present invention has a connecting portion connected to a hose formed on one side in the axial direction, and a pair of engaging slits formed on the other side in the axial direction so as to face each other in the radial direction. A cylindrical connector housing and a pair of engagement arms, and the pair of engagement arms enter the engagement slit and sandwich the connector housing, thereby moving the connector housing to the other side in the axial direction. An attached U-shaped or substantially U-shaped wire retainer, and the engagement arm of the wire retainer projects into the connector housing from the engagement slit, and the insertion end of the pipe body is inserted. A quick connector configured to snap-engage with the other annular surface in the axial direction of the annular engagement protrusion formed at the insertion end when The engaging arm engages with the axially other annular surface of the annular engaging protrusion in a non-contact state (non-engaged state) with the outer peripheral edge of the axially other annular surface. Is formed. When the engagement arm (often circular in cross section) is in contact with or engaged with the outer peripheral edge of the other annular surface in the axial direction of the annular engagement protrusion, the pipe body is pulled relatively in the pulling direction. In addition, the engaging arm may slide on the outer peripheral edge of the other annular surface in the axial direction and open radially outward. Therefore, here, the engaging arm is formed so as to contact or engage with the axially other side annular surface of the annular engaging protrusion only at a place other than the outer peripheral edge of the axially other side annular surface. Alternatively, the engagement arm is formed so as to contact or engage with the axially other side annular surface of the annular engagement protrusion only inside the outer peripheral edge of the axially other side annular surface.

  In order to engage the engagement arm with the outer circumferential edge of the other annular surface in the axial direction in a non-contact state with the other annular surface in the axial direction of the annular engagement protrusion, for example, A projecting portion is formed, and one end portion (tip portion) in the axial direction of the projecting portion is inside the outer peripheral edge of the other annular surface in the axial direction, and the other annular surface in the axial direction of the annular engaging projection. What is necessary is just to comprise so that it may contact and engage with.

  The quick connector of the present invention is also a cylindrical connector in which a connecting portion to be connected to the hose is formed on one side in the axial direction, and a pair of engagement slits are formed on the other side in the axial direction so as to face in the radial direction. A U-shape having a housing and a pair of engagement arms, the pair of engagement arms being attached to the other axial side of the connector housing by entering the engagement slit and sandwiching the connector housing Or an approximately U-shaped wire retainer, and the engagement arm of the wire retainer protrudes from the engagement slit into the connector housing and is inserted when the insertion end of the pipe body is inserted. A quick connector configured to snap-engage with an annular surface on the other side in the axial direction of an annular engagement protrusion formed at an end, wherein the engagement arm Engaging the outer circumferential surface of the annular engagement projection with the other annular surface in the axial direction in contact with the outer periphery of the insertion end of the pipe body (including the state immediately before contact). Only the contact portion (the portion immediately before contact) can be configured to engage with the other annular surface in the axial direction of the annular engagement protrusion. Alternatively, it engages with the other annular surface in the axial direction only at the contact portion with the outer periphery of the insertion end portion (the portion immediately before contact). The pair of engagement arms of the wire retainer is usually in a state in which the outer periphery of the insertion end of the pipe body (a portion other than the annular engagement projection) is sandwiched (for example, in a sandwiched state), and the other of the annular engagement projections in the axial direction. Engages with side annular surface. Therefore, if the engagement arm is engaged with the other annular surface in the axial direction of the annular engagement protrusion only at the contact portion with the outer periphery of the insertion end of the pipe body, the engagement arm is in the other axial direction. It can prevent effectively contacting or engaging with the outer periphery of a side annular surface. Here, the axially other side annular surface of the annular engagement protrusion has a width wider than the diameter of the engagement arm, for example.

  As described above, in the quick connector of the present invention, the engagement arm of the wire retainer and the annular engagement protrusion of the pipe body can be firmly engaged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a perspective view of a quick connector according to the present invention, FIG. 2 is a sectional view of the quick connector, FIG. 3 is another sectional view of the quick connector, FIG. 4 is an exploded perspective view of the quick connector, and FIG. FIG.

  The quick connector 1 is used, for example, for connection of an air supply / exhaust pipe of an automobile. As can be understood particularly from FIGS. 1 to 3, the quick connector 1 is attached to the thin connector housing 3 and the connector housing 3. And a U-shaped or substantially U-shaped wire retainer 5. The connector housing 3 is made of, for example, metal, and is integrally configured from a cylindrical hose connection portion 7 (connection portion) on one axial side and a substantially cylindrical pipe insertion portion 9 on the other axial side. In order to connect the large diameter hose and the large diameter pipe body, the large diameter hose is formed relatively short.

  The hose connection portion 7 is composed of a cylindrical connection portion main body 11 and a retaining portion 13 that is integrally formed at one end of the connecting portion main body 11 in the axial direction. The diameter is increased in a tapered shape from one end toward the other side in the axial direction, and is bent so as to protrude outward in the radial direction from the connection portion main body 11. One end in the axial direction of the retaining portion 13 is formed to have a smaller diameter than the connecting portion main body 11, for example.

  The pipe insertion portion 9 is formed between the retainer mounting portion 15 on the other side in the axial direction, the pipe support portion 17 on the one side in the axial direction to which the hose connection portion 7 is connected, and the retainer mounting portion 15 and the pipe support portion 17. The pipe support portion 17 is smaller in diameter than the seal holding portion 19 and larger in diameter than the connecting portion main body 11 of the hose connecting portion 7. Yes.

  The annular retainer mounting portion 15 of the pipe insertion portion 9 is formed to have the same diameter as the seal holding portion 19, more specifically, the same diameter as the other side in the axial direction of the seal holding portion 19. It has a structure provided with mounting projections 21, 21 having a cylindrical wall-shaped radially outer wall, and each of the pair of mounting projections 21, 21 has a substantially arc length of a quarter. Is formed over. However, the mounting protrusion 21 may be formed over the entire circumference. Engagement slits 23 are formed on the radially outer wall portions of the respective mounting projections 21. The engagement slits 23 are connected to one side slit portion 25 formed on one side in the circumferential direction and the circumferential slit. The other side slit portion 27 is formed on the other side in the direction and has a shape equal to or symmetrical to the one side slit portion 25, and the one side slit portion 25 and the other side slit portion 27 are the one side slit. Between the portion 25 and the other side slit portion 27, a portion 29 having a circumferential width substantially equal to the width of the engagement slit 23 or slightly longer than the width of the engagement slit 23 (for example, almost twice as long) Part) is left. That is, the engagement slit 23 is divided into the one-side slit portion 25 and the other-side slit portion 27 by, for example, a dividing portion 29 located at the circumferential center. In addition, the width (axial width) of the mounting protrusion 21 is set to approximately three times or three to four times the width (axial width) of the engagement slit 23. Specifically, the width of the engagement slit 23 is set to 2.6 mm to 2.8 mm (in some cases, it may be 3.3 mm).

  The circumferential one end wall portion 31 and the circumferential other end wall portion 33 of the mounting protrusion 21 are connected to the dividing portions 29 so as to spread in parallel with the straight line passing through the axial center and the axis, that is, mounting the wire retainer 5. It is formed so as to spread in a direction orthogonal to the direction. Moreover, between the circumferential direction one end wall part 31 of the protrusion part 21 for attachment, and the circumferential direction one end of the one side slit part 25, and between the circumferential direction other end wall part 33 and the other side slit part 27 of the protrusion part 21 for attachment A circumferential interval approximately twice the width of the engagement slit 23 is provided between the other end in the circumferential direction, and one end in the circumferential direction and the other end in the circumferential direction of the mounting projection 21 are Retaining wall portions 35 and 37 having a circumferential length or a circumferential width approximately twice the width of the engagement slit 23 are formed.

  In the mounting projection 21, a slit-like one-side entrance / exit 38 extending short in one axial direction is formed at one circumferential end of the one-side slit 25, and at the other circumferential end of the other-side slit 27. Also, a slit-like other side entrance 39 that is shortly extended on one side in the axial direction is formed.

  In addition, the retainer attaching part 15 of the connector housing 3 is formed in the symmetrical shape which can attach the wire retainer 5 similarly from the radial direction opposite side.

  The other end in the axial direction of the retainer mounting portion 15 (the other end in the axial direction of the pipe insertion portion 9 or the connector housing 3) is integrally provided with an outward flange 40 protruding outward in the radial direction. The flange 40 is formed integrally with the other axial end of the mounting projection 21. Although the outward flange 40 has a circular outer edge, the outer edge of this part is formed so as to be cut off at the corresponding part between the pair of mounting projections 21, 21. It is set in a straight line.

  A rubber O-ring 41 is fitted on the inner peripheral surface of the seal holding part 19 on one side in the axial direction, and a metal bush 43 formed on an annular body is press-fitted on the other side in the axial direction. The O-ring 41 is sandwiched between a stepped portion 44 formed at one end in the axial direction of the seal holding portion 19 and the bush 43 and is positioned in the axial direction. In the seal holding part 19, the other axial side is formed with a slightly larger diameter than the one axial side.

  The bush 43 used in the quick connector 1 is integrated with a receiving portion 51 for receiving an annular engagement protrusion 49 (see FIG. 6) of the pipe body 47 on the other axial side of a simple annular bush body 45. The inner peripheral surface of the receiving portion 51 is enlarged in diameter toward the other axial side so as to correspond to the tapered annular surface on the one axial side of the annular engaging projection 49. It is formed in a tapered shape. A closed portion 53 that protrudes somewhat toward the other side in the axial direction is integrally formed at a radially symmetric position of the receiving portion 51, and each closed portion 53 has a circumferential length corresponding to the mounting protruding portion 21. have. The closed portion 53 has an inner surface formed so as to extend the inner peripheral surface of the receiving portion 51, enters into the mounting protrusions 21, 21, and the inner peripheral surface of the mounting protrusions 21, 21 or Although it is formed to protrude radially outward from the bush main body 45 and the receiving portion 51 so as to be in contact with the inner surface, it has an outer surface corresponding to the inner peripheral surface or inner surface of the mounting protruding portions 21, 21. The central portion (intermediate portion) in the circumferential direction of the portion that enters the mounting protrusion 21 is cut off to form a passage portion 55. Therefore, when the bush 43 is fitted to the connector housing 3, the one-side entrance / exit 38 of the one-side slit portion 25 and the other-side entrance / exit 39 of the other-side slit portion 27 are connected to the inner peripheral surface or the inner surface of the mounting projections 21, 21. The outer peripheral surface or outer periphery of the closed portion 53 that is in contact is configured to be totally or partially closed. Although the passage portion 55 is formed to be slightly deviated to one side in the mounting direction of the wire retainer 5 (refer to FIG. 9, the passage portion 55 is formed to be deviated upward), but is symmetrical to the attachment direction. You may form in.

  The wire retainer 5 includes a connecting portion 57 and a pair of long engaging arms 59, 59 extending linearly in parallel with each other from both sides (both sides in the width direction or both ends in the width direction) of the connecting portion 57. The connecting portion 57 has shoulder portions 61, 61 on both sides, and a U-shape that bulges outward between the shoulder portions 61, 61. A finger hook 63 is provided. Each of the shoulder portions 61 includes a shoulder portion main body 64 on the engagement arm 59 side and a stopper portion 65 on the finger hanging portion 63 side for making the engagement arm 59 easy to open. Curved in an arc until the end or the end in the width direction of the finger-holding portion 63 is directed to the laterally outer side, that is, the direction in which the engagement arm 59 extends or the direction in which the wire retainer 5 is attached is directed outward. The shoulder main body 64 is formed so as to protrude and extend so as to correspond to the retaining wall portion 35 on one side in the circumferential direction, and the circumferential length of the retaining wall portion 35. They have the same or almost the same length.

The pair of engagement arms 59, 59 includes a long arm main body 66 extending linearly from the front end of the shoulder 61 or the shoulder main body 64 (the end opposite to the finger hanging portion 63), and the front end of the arm main body 66 (free The retaining member 67 is integrally formed by bending inwardly at the side end). Here, the wire rod of the wire retainer 5 or the engagement arm 59 or the arm main body 66 is formed. The outer diameter is set to 2.3 mm. A central portion of the arm main body 66 of the engaging arm 59 is formed to be curved so as to slightly bulge to one side in the axial direction to form a protrusion 68. Further, the retaining engagement portion 67 of the engaging arm 59 is inclined so as to correspond to the retaining wall portion 37 on the other circumferential side of the mounting projection 21, and the periphery of the retaining wall portion 37. An engagement main body 69 that is bent inward and formed to have a length substantially the same as the length in the direction, and a shaft that is integrally formed at the tip of the engagement main body 69 by bending in one axial direction. And an axial direction portion 71 extending to one side in the direction (substantially one axial direction), and the engagement body portions 69, 69 of the respective retaining engagement portions 67, 67 are on the other circumferential retaining wall. The portion 37, 37 is formed so as to come into contact with and engage with the retaining wall portion 37, 37 along or along the outer surface thereof.

  The length of the arm main body 66 is substantially equal to that of the engagement slit 23, that is, substantially equal to the interval between the one end in the circumferential direction of the one-side slit portion 25 and the other end in the circumferential direction of the other-side slit portion 27. The interval between the arm main body portions 66 and 66 is set to be substantially equal to the inner diameter of the pipe support portion 17, the inner diameter of the bush main body 45 of the bush 43, or the outer diameter of the pipe body 47.

  In order to assemble the quick connector 1 having such a configuration, first, the wire retainer 5 is attached to the connector housing 3 from the one side slit portion 25 side. The wire retainer 5 is attached by inserting the axial direction portion 71 of the retaining engagement portion 67 into the connector housing 3 from the one side entrance 38 of the one side slit portion 25 and outside from the other side entrance 39 of the other side slit portion 27. To protrude. Then, in the wire retainer 5, the respective shoulder portions 61, 61 are provided along the retaining wall portions 35, 35 on one side in the circumferential direction of the mounting projections 21, 21, and the retaining wall portions 35, 35 along the outer surface. The shoulder main bodies 64, 64 are in contact with the retaining wall portions 35, 35 on one side in the circumferential direction of the mounting projections 21, 21, and along the outer surfaces of the retaining wall portions 35, 35, Alternatively, the stopper portions 65 and 65 are in contact with each other, and the respective stopper portions 65 and 65 are in contact with the circumferential one side end wall portions 31 and 31 of the mounting projection portions 21 and 21, and the respective retaining engagement portions 67 are provided. , 67 or the engagement main body 69, 69 along or along the outer surface of the retaining wall 37, 37 on the other circumferential side of the mounting projections 21, 21 and the retaining wall 37, 37. Like Contact, engage, and be attached to the retainer attaching section 15 of the connector housing 3. The shoulder body 64 may be formed so as to be lifted from the retaining wall portion 35 on one side in the circumferential direction of the mounting projection 21. In order to project the axial portion 71 outward from the other side entrance / exit 39 of the other side slit portion 27 and engage the retaining engagement portion 67 or the engagement main body 69 with the retaining wall portion 37 in the axial direction When the portion 71 approaches the other end in the circumferential direction of the other slit portion 27, the insertion of the engagement arm 59 is interrupted, and the engagement arm 59, for example, the axial portion 71 is positioned at the other side entrance 39. The insertion of the engagement arm 59 may be resumed after elastically deforming outward. Then, the axial direction portion 71 comes out of the other side slit portion 27, and the engagement main body portion 69 also comes out of the other side slit portion 27 and engages with the retaining wall portion 37 in the pulling direction (acting pulling resistance). To engage). Thus, in the wire retainer 5, the stopper portions 65, 65 are engaged with the one end wall portions 31, 31 in the circumferential direction of the mounting projections 21, 21 in the insertion direction (so that the insertion resistance acts). In the state where the retaining engagement portions 67 and 67 are engaged with the mounting projections 21 and 21 in the pulling direction, the retainer mounting portion 15 is sandwiched between the pair of engaging arms 59 and 59 and attached to the quick connector 1. It will be attached. The pair of engaging arms 59 and 59 are inserted into the connector housing 3 with the protruding portions 68 protruding from the engaging slits 23 and 23. Further, the protruding amount of the protruding portion 68 of the arm main body 66 is set to 0.5 mm to 1.0 mm. Here, even if the wire retainer 5 is further pushed in at this attachment position by the contact between the stopper portions 65 and 65 and the one end wall portions 31 and 31 in the circumferential direction of the attachment projections 21 and 21, a pair of engagements is possible. The joint arms 59 and 59 are not opened so as to pass the annular engagement protrusion 49 of the pipe body 47.

  The distance between the one ends in the circumferential direction of the one-side slit portion 25 and the distance between the other ends in the circumferential direction of the other-side slit portion 27 are equal, and the outer diameter of the pipe body 47 (the outer diameter of the portion other than the annular engagement protrusion 49). Since the wire retainer 5 is set to be substantially equal, the pair of engaging arms 59 and 59, more specifically, the pair of arm main body portions 66 and 66 extend in parallel with each other without spreading. Thus, the central portion of the protrusion 68 is brought into contact with the outer periphery of the pipe body 47 and attached to the retainer attachment portion 15.

  Then, as shown in FIG. 4, the bush 43 is pushed into the connector housing 3 with the wire retainer 5 moved in the retracting direction until just before the axial portion 71 enters the other side entrance 39. The interval between the arm body portions 66 and 66 of the wire retainer 5 or the interval between the arm body portions 66 and 66 protruding into the connector housing 3 is substantially equal to the interval between the passage portions 55 and 55 of the bush 43. Alternatively, since it extends so as to be slightly larger than the interval between the passage portions 55, 55 (because it extends so as not to cover the outer edge of the bush body 45 or overlap), that is, the engagement arm 59, 59 or the arm main body portions 66 and 66 are open so as to allow the passage of the bush 43, or the engaging arms 59 and 59 or the arm main body portions 66 and 66 are connected to the passage portions 55, 55 and 55 of the bush 43. Since the bush body 45 is opened to allow passage of the bush body 45, the bush 43 is passed through the wire retainer 5 to It can be pressed into the Le holding portion 19. Since the closing portion 53 of the bush 43 partially closes the one-side entrance / exit 38 and the other-side entrance / exit 39, for example, in the quick connector 1, the wire retainer 5 is connected to the connector housing unless the bush 43 is removed from the connector housing 3. There is no such thing as going out of 3.

  6 is a cross-sectional view along the axial direction showing a state in which a rubber hose and a pipe body 47 are connected to the quick connector 1, and FIG. 7 is along a radial direction showing a state in which the pipe body 47 is connected to the quick connector 1. FIG. 8 is a cross-sectional view and FIG. 8 is a view showing an engagement state between the protrusion 68 of the engagement arm 59 and the annular engagement protrusion 49.

  The rubber hose 73 is fitted on the outer periphery of the hose connection portion 7 so that the tip end or the other axial end approaches the stepped portion 75 formed at the one axial end of the pipe support portion 17 and is tightened. It is fastened to the connecting portion main body 11 by a band 77 and is connected to the quick connector 1 in a sufficiently secured state. The tightening band 77 is a screw type, but a spring type can also be used. Furthermore, the hose 73 can be prevented from coming off by caulking the ring instead of the band.

  The pipe body 47 inserted into and fitted into the quick connector 1 from the other end opening 79 in the axial direction of the retainer mounting portion 15 is made of, for example, metal, and one side in the axial direction has an annular engagement protrusion 49 on the outer peripheral surface. It is of the type configured as an insertion end 81. Here, the one-side annular surface in the axial direction of the annular engagement protrusion 49 is formed in a tapered shape whose diameter increases toward the other side in the axial direction. The pipe body 47 advances relatively while the annular surface on the one side in the axial direction of the annular engagement protrusion 49 pushes the gap between the arm main body portions 66 and 66 of the wire retainer 5 (the imaginary of the engagement arm 59 in FIG. 7). (Refer to the line display, even when the arm main body portions 66 and 66 are most expanded, the projecting portions 68 and 68 are located in the connector housing 3), and abut against the inner peripheral surface of the receiving portion 51 of the bush 43. Then, the insertion end 81 is pushed into the quick connector 1 or the connector housing 3 until it is inserted into the pipe insertion portion 9 of the connector housing 3 over the entire length. The other-side annular surface 82 in the axial direction of the annular engagement protrusion 49 is formed so as to extend from the outer peripheral surface of the pipe body 47 in a radial direction or a direction perpendicular to the axis with a width of 2.6 mm to 2.8 mm. When the one-side annular surface in the axial direction of the engaging protrusion 49 abuts on the inner peripheral surface of the receiving portion 51 of the bush 43, the axial end of the engaging slit 23 coincides or substantially coincides with the axial end. Alternatively, since the arm main body portions 66 and 66 of the wire retainer 5 are positioned slightly on the one axial side with respect to the axial end 83 of the engagement slit 23, the pipe body 47 is located inside the pipe insertion portion 9 of the connector housing 3. When it is inserted normally, the annular engagement protrusion 49 or the other of the annular engagement protrusions 49 in the axial direction is restored so as to snap back to the parallel state by the elastic return force and prevent the pipe body 47 from coming off. Annular surface 82 and snaps (i.e., the other axial side annular surface 82 is to be positioned so that it can snap engagement with the arm body 66, 66). The distal end portion 84 of the projecting portion 68 of the arm main body portion 66 is in contact with the outer periphery of the insertion end portion 81 of the pipe body 47 and is in contact with or engaged with the other axial surface 82 in the axial direction of the annular engagement protrusion 49. However, the radially outer end (the outer end in the radial direction of the pipe body 47) of the distal end portion 84 of the projecting portion 68 is located inside the outer peripheral edge of the other axial side annular surface 82, and the distal end portion 84. Is in contact with the other annular surface 82 in the axial direction on the inner side of the radially outer end. Since the width of the engagement slit 23 is set wider than the diameter of the arm main body 66 (10% to 25% increase in the diameter of the arm main body 66), the snap action of the arm main body 66 is sharp, and the retaining is prevented. The engaging portions 67 and 67 collide with the retaining wall portion 37 of the connector housing 3, and the protruding portions 68 and 68 of the arm main body portion 66 (more specifically, the distal end portion 84 of the protruding portion 68) It collides with the outer periphery of the body 47 and generates a clear collision sound.

  One end in the axial direction of the insertion end 81 of the pipe body 47 passes through the O-ring 41 and reaches the inside of the pipe support portion 17, and the pipe body 47 or the insertion end 81 of the pipe body 47 and the quick connector 1 or connector housing. 3 is sealed by an O-ring 41, and one side in the axial direction of the annular engagement protrusion 49 of the insertion end 81 of the pipe body 41 is loosened in the radial direction by the pipe support 17 and the bush 43. It is supported so that it does not occur. The annular engagement protrusion 49 of the pipe body 47 is snap-engaged with the engagement arms 59 and 59 or the arm main body portions 66 and 66, and the snap operation of the engagement arm 59 or the arm main body portion 66 is performed. When the axially one side annular surface of the annular engagement protrusion 49 is accommodated in the bush 43 so that it does not become dull due to sliding with the annular engagement protrusion 49, as described above, the annular engagement protrusion The annular surface 49 on the other side in the axial direction 49 may be configured to be located slightly on the one side in the axial direction with respect to the axial end 83 of the engagement slit 23.

  FIG. 9 is a view for explaining a method of operating the wire retainer 5 of the quick connector 1.

  When the pipe body 47 is detached from the quick connector 1, for example, a finger is put on the finger-holding portion 63 of the wire retainer 5 held at the attachment position (position shown in FIG. 7) to apply a pulling force (retraction force). (See arrow A in FIG. 7). Then, the wire retainer 5 slides the engagement main body 69 of each engagement arm 59 toward the other slit portion 27 on the outer surface of the retaining wall portion 37 on the other circumferential side of the mounting projection 21. The engaging arms 59 and 59 gradually open while moving in the retracting direction. When the wire retainer 5 continues to be pulled, the arm main body portion 66 comes into contact with the dividing portion 29 and is strongly pressed, and the wire retainer 5 can be moved in the retracted direction beyond the position (the retracted position shown in FIG. 9). In this state (retracted state), the engagement arms 59 and 59 are open to the extent that the annular engagement protrusion 49 of the pipe body 47 can pass through. Here, the axial portion 71 is formed so as to be slightly lifted from the outer surface of the retaining wall portion 37 on the other circumferential side of the mounting projection 21 (more specifically, the bending of the axial portion 71). The starting end may contact, engage and slide with the outer surface of the retaining wall portion 37), and the entire axial portion 71 may slide on the outer surface of the retaining wall portion 37.

  Further, in this retracted state, the distal end of the engagement main body 69 of the retaining engagement portion 67 is in a state where it is detached from the retaining wall portion 37 and falls into the other side slit portion 27. The other side entrance / exit 39 is, for example, partially blocked by the outer peripheral surface or the outer surface of the closed portion 53 of the bush 43, so that the axial portion 71 does not enter the connector housing 3. The direction portion 71 (the bending start end or the bending start end side of the axial direction portion 71) is related to the other end in the circumferential direction of the other side entrance / exit 39 of the other side slit portion 27 or the other end in the circumferential direction of the other side slit portion 27 in the mounting direction. (Axial direction part 71 inclines outward toward the tip, for example). Therefore, even if the retracting force is released from the wire retainer 5, the wire retainer 5 is held in the retracted state. In order to return the retracted wire retainer 5 to the attachment position, the wire retainer 5 is strongly pressed in the attachment direction, and the axial direction portion 71 of the retaining engagement portion 67 is moved to the other side slit portion 27 and the other side entrance / exit 39. Alternatively, the retaining wall portion 37 is pushed out from the other side slit portion 27 on the outer surface or in the direction. Or the axial direction part 71 is moved outside and the front-end | tip of the engaging part main body 69 of the retaining engagement part 67 is pushed out from the other side slit part 27 on the outer surface of the retaining wall part 37. The wire retainer 5 moves smoothly to the attachment position by the elastic return force of the engagement arms 59, 59 trying to return in parallel.

  FIG. 10 is a view showing another configuration of the protruding portion of the engaging arm 59.

  The projecting portion 85 having another configuration is formed by continuously forming two triangular projecting portions 87 and 87 projecting to the other side in the axial direction at the central portion of the arm main body portion 66, and connecting the projecting portions 87 and 87 ( The distal end portion 89 of the projecting portion 85 is configured to project from the straight portion of the arm main body portion 66 to one side in the axial direction by 0.5 mm to 1.0 mm. Since the axial lengths of the protrusion 87 and the protrusion 85 are substantially equal to the axial length of the one-side entrance / exit part 38, the insertion of the engagement arm 59 into the one-side slit 25 is performed by the protrusion 87 and the protrusion 85. Is smoothly performed by passing through the one-side entrance / exit part 38. The pair of engagement arms 59, 59 are inserted into the connector housing 3 by projecting the projection 85 from the engagement slits 23, 23, and the tip 89 of the projection 85 is the outer periphery of the insertion end 81 of the pipe body 47. Will come into contact. The arm main body 66 is in contact with or engaged with the other annular surface 82 in the axial direction of the annular engagement protrusion 49 only at the distal end 89 of the protrusion 85, but the radial direction of the distal end 89 of the protrusion 85 The outer end (the outer end in the radial direction of the pipe body 47) is located on the inner side of the outer peripheral edge of the other axial surface 82 in the axial direction (more specifically, the distal end portion 89 is more than the outer end in the radial direction). Inside, in contact with the other annular surface 82 in the axial direction). In addition, even when the arm main body portions 66 and 66 are most expanded by the annular engagement protrusion 49 of the pipe body 47, the protrusion 87 and the protrusion 85 are located in the connector housing 3.

  The quick connector of the present invention firmly prevents the pipe body from coming off by being applied to a super heat-resistant air hose in automobile piping or the like.

1 is a perspective view of a quick connector according to the present invention. It is sectional drawing of a quick connector. It is another sectional view of a quick connector. It is a disassembled perspective view of a quick connector. It is an assembly drawing of a quick connector. It is sectional drawing along the axial direction which shows the state which connected the rubber-made hose and the pipe body to the quick connector. It is sectional drawing along the radial direction which shows the state which connected the pipe body to the quick connector. It is a figure which shows the engagement state of the protrusion part of an engagement arm, and a cyclic | annular engagement protrusion. It is a figure for demonstrating the operation method of the wire retainer of a quick connector. It is a figure which shows another structure of the protrusion part of an engagement arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Quick connector 3 Connector housing 5 Wire retainer 7 Hose connection part 23 Engagement slit 47 Pipe body 49 Annular engagement protrusion 59 Engagement arm 68, 85 Protrusion part
81 Insertion end 82 Axial surface on the other side in the axial direction

Claims (5)

A cylindrical connector housing having a connection portion connected to the hose formed on one axial side and a pair of engagement slits formed opposite to each other in the radial direction on the other axial side, and a pair of engagement arms The pair of engagement arms enter the engagement slit and sandwich the connector housing so that the U-shaped or substantially U-shaped wire retainer is attached to the other axial side of the connector housing. And the engagement arm of the wire retainer protrudes into the connector housing from the engagement slit and is formed at the insertion end when the insertion end of the pipe body is inserted. A quick connector configured to snap-engage with the other annular surface in the axial direction of the engaging protrusion,
The engagement arm is formed so as to engage with the other annular surface in the axial direction of the annular engagement protrusion in a non-contact state with an outer peripheral edge of the other annular surface in the axial direction. And quick connector. A cylindrical connector housing having a connection portion connected to the hose formed on one axial side and a pair of engagement slits formed opposite to each other in the radial direction on the other axial side, and a pair of engagement arms The pair of engagement arms enter the engagement slit and sandwich the connector housing so that the U-shaped or substantially U-shaped wire retainer is attached to the other axial side of the connector housing. And the engagement arm of the wire retainer protrudes into the connector housing from the engagement slit and is formed at the insertion end when the insertion end of the pipe body is inserted. A quick connector configured to snap-engage with the other annular surface in the axial direction of the engaging protrusion,
The engagement arm is formed so as to engage with the other axial surface of the annular engagement protrusion only on the inner side of the outer peripheral edge of the second annular surface in the axial direction. And quick connector.   The engagement arm has a protruding portion on one side in the axial direction, and one end portion in the axial direction of the protruding portion is inside the outer peripheral edge of the annular surface on the other side in the axial direction, and the protruding portion of the annular engaging protrusion is The engagement arm is brought into contact with and engaged with the other annular surface in the axial direction, so that the engagement arm is located only on the inner side of the outer peripheral edge of the other annular surface in the axial direction. The quick connector according to claim 2, wherein the quick connector engages with an annular surface. A cylindrical connector housing having a connection portion connected to the hose formed on one axial side and a pair of engagement slits formed opposite to each other in the radial direction on the other axial side, and a pair of engagement arms The pair of engagement arms enter the engagement slit and sandwich the connector housing so that the U-shaped or substantially U-shaped wire retainer is attached to the other axial side of the connector housing. And the engagement arm of the wire retainer protrudes into the connector housing from the engagement slit and is formed at the insertion end when the insertion end of the pipe body is inserted. A quick connector configured to snap-engage with the other annular surface in the axial direction of the engaging protrusion,
The engagement arm engages with the other axial surface of the annular engagement projection in contact with the outer periphery of the insertion end of the pipe body and contacts the outer periphery of the insertion end. The position of the engagement arm and the portion of the engagement arm that engages with the other annular surface in the axial direction of the annular engagement protrusion are the same in the length direction of the engagement arm. Features quick connector.   The quick connector according to claim 4, wherein the other annular surface in the axial direction of the annular engagement protrusion has a width wider than the diameter of the engagement arm.

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