JP2006266475A - Quick connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quick connector with a bush for pressing a seal member to construct a piping structure having improved sealing performance. <P>SOLUTION: On the outer peripheral face of a bush body 45 of the bush 43 for pressing an O-ring 41, four engaging recesses 58 are provided at peripherally equal spaces. The bush 43 is fitted into a seal holding portion 19, and then a position of the seal holding portion 19 corresponding to the engaging recessed portion 58 is protruded and deformed to the inside and enters into the engaging recessed portion 58 to form an engaging protruded portion 59 engaging with the engaging recessed portion 58. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 from the opening on the other side end in the axial direction, and the retainer means and the annular engagement projection are snap-engaged to keep the pipe body and the connector from coming off. .

  An annular seal member for sealing between the inserted end of the inserted pipe body is disposed in the connector housing. The seal member may be fitted into a narrow annular recess formed on the inner peripheral surface of the connector housing. However, the seal member is attached to the inner peripheral surface of the connector housing so that the seal member can be easily fitted. An accommodation recess having an open end in the axial direction is formed, and a sealing member is fitted in the accommodation recess, and then the lid is covered with an annular bush on the open side to confine the seal member in the accommodation recess. Is also adopted (see, for example, Patent Document 1).

JP 2003-294184 A

  By the way, when the seal member is pressed using an annular bush, the bush needs to be fixedly fitted in the connector housing so as not to be displaced in the axial direction. As described in Patent Document 1, the bush is fixedly fitted with a bush-side irregular shape on the outer peripheral surface of the bush and a connector corresponding to the bush-side irregular shape on the inner peripheral surface of the connector housing. A side uneven shape is formed, the bush is press-fitted into the connector housing, and the bush side uneven shape and the connector side uneven shape are fitted together.

  However, in such a method of fixing the bush, when the bush is press-fitted, the unevenness on the bush side and the unevenness on the connector side are shaved, so that sufficient fixing strength of the bush cannot be secured, and the bush is axially used during use. There is a risk of slipping. If the bush is displaced in the axial direction, the seal member may be deformed excessively, and the sealing performance between the connector housing and the pipe body is impaired.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a quick connector that has a bush for pressing a seal member and can constitute a piping structure having excellent sealing performance.

  In order to achieve this object, the quick connector of the present invention is provided with a cylindrical connector housing in which a connecting portion connected to a hose is formed on one side in the axial direction, and on the other side in the axial direction of the connector housing. Retainer means, an annular seal member disposed in the connector housing, and an annular bush fitted in the connector housing to hold down the seal member, the insertion end of the pipe body being inserted When this is done, the annular engaging projection formed on the insertion end and the retainer means are engaged with each other, and the gap between the insertion end and the connector housing is sealed with the seal member. An engagement recess is formed in advance on the outer circumference of the bush, and the connector housing has a quick connector. Engaging protrusion protruding inwardly to Kigakarigo recess and engaged, are those formed from by fitting the bush. The hose widely includes a mating member that is coupled to the pipe body, and the connecting portion includes a connecting portion of the mating member that is coupled to the pipe body. An engagement recess is formed on the outer periphery of the bush in advance, that is, before being fitted into the connector housing. However, a protrusion that engages with the engagement recess is formed on the connector housing when the bush is fitted. It has not been. Therefore, the bush is smoothly arranged in the connector housing.

  After the bushing is disposed in the connector housing, an engagement protrusion that protrudes inward is formed in the connector housing. The engagement protrusion is formed so as to enter the engagement recess of the bush and engage with the engagement recess. For example, the engagement protrusion can be easily formed by recessing the side wall of the connector housing from the outside to the inside. If the connector housing is made of metal, it is easy to form the engaging protrusion by such means. The engagement protrusion engages with the engagement recess so as to prevent at least displacement of the bush in the axial direction, that is, displacement to one side or the other side in the axial direction. The engagement protrusions can also engage with the engagement recesses so as to prevent misalignment of one side and the other side of the bush in the axial direction. The engagement protrusion can further engage with the engagement recess so as to prevent displacement of the bush in the axial direction and circumferential direction. The engagement protrusion and the engagement recess engage with each other so as to prevent displacement toward one side or the other side in the circumferential direction, or displacement toward one side and the other side in the circumferential direction.

  The engaging recess can be formed on the entire outer periphery of the bush. However, a plurality of engaging recesses are formed on the outer periphery of the bush with a gap in the circumferential direction, and a plurality of engagement protrusions are formed in the connector housing corresponding to the engagement recesses and with a gap in the circumferential direction. It can also be formed. By comprising in this way, an engagement protrusion part and an engagement recessed part can be easily engaged in the axial direction and the circumferential direction.

The quick connector of the present invention can be assembled by the following method.
A cylindrical connector housing having a connecting portion connected to a hose on one side in the axial direction, retainer means provided on the other side in the axial direction of the connector housing, and an annular shape disposed in the connector housing A seal member, and an annular bush fitted into the connector housing to hold down the seal member, and is formed at the insertion end when the insertion end of the pipe body is inserted. A method of manufacturing a quick connector, in which an annular engagement protrusion and the retainer means are engaged with each other, and a gap between the insertion end and the connector housing is sealed with the seal member,
In the connector housing in which the seal member is arranged, the bush having an engagement recess formed on the outer periphery is fitted,
A method of manufacturing a quick connector, wherein an engagement protrusion that protrudes inward is formed on the connector housing so as to engage with the engagement recess of the bush.

  As described above, according to the present invention, it is possible to provide a quick connector capable of firmly fixing a bush to a connector housing and ensuring a stable sealing function by a seal member.

  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 metal such as aluminum, for example, and is configured integrally with a cylindrical hose connection part 7 (connection part) on one axial side and a substantially cylindrical pipe insertion part 9 on the other axial side. In order to connect the large-diameter hose and the large-diameter pipe body, the large-diameter hose and the large-diameter pipe body are 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.

  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 (seal member) is fitted on the inner peripheral surface of the seal holding portion 19 on one side in the axial direction, and is formed in an annular body on the other side in the axial direction, such as aluminum. A metal bush 43 is fitted, and the O-ring 41 is positioned between the stepped portion 44 formed at one end of the seal holding portion 19 in the axial direction and the bush 43 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. 7) of the pipe body 47 on the other side in the axial direction 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 part (intermediate part) in the circumferential direction of the part that enters into the mounting protrusion 21 is cut off to form a passage part 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.

  In the bush 43, the outer periphery of one end in the axial direction of the bush main body 45 abuts on a low stepped portion 56 formed at the center in the axial direction of the seal holding portion 19, and the outer peripheral surface of the bush main body 45 is the inner peripheral surface of the seal holding portion 19. So as to be in a contact state with the seal holder 19. The outer peripheral surface 57 of the bush body 45 is provided with four engagement recesses 58 at equal intervals in the circumferential direction. Each engagement recess 58 is a rectangle that is long in the circumferential direction, and the end in the circumferential direction is half. It is formed to have a circular shape and a rectangular cross section.

  The seal holding portion 19 is provided with four engagement protrusions 59 protruding inward at the position of the engagement recess 58 of the bush main body 45 at equal intervals in the circumferential direction. It is formed by driving a corresponding portion of the holding portion 19 from the outside. The engagement protrusion 59 is formed so as to enter the engagement recess 58 and engage with the engagement recess 58 in the axial direction. Therefore, by forming the engagement protrusion 59 in the seal holding part 19, the bush main body 45 is firmly positioned and fixed in the axial direction (particularly the other side in the axial direction). The engagement protrusion 59 is also formed to engage with the engagement recess 58 in the circumferential direction.

  The wire retainer 5 includes a connecting portion 60 and a pair of long engaging arms 61 and 61 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 60. The connecting portion 60 has shoulder portions 62 and 62 on both sides, and a U-shape that bulges outward between the shoulder portions 62 and 62. A finger hook 63 is provided. Each of the shoulder portions 62 includes a shoulder portion main body 65 on the engagement arm 61 side and a stopper portion 66 on the finger-hanging portion 63 side for making the engagement arm 61 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 61 extends or the direction in which the wire retainer 5 is attached is directed outward. The shoulder main body 65 is inclined 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 engaging arms 61, 61 includes a long arm main body 67 extending linearly from the front end of the shoulder 62 or the shoulder main body 65 (the end opposite to the finger-hanging portion 63), and the front end of the arm main body 67 (free And a retaining engagement portion 71 integrally formed by bending inwardly at the side end). The retaining engagement portion 71 of the engaging arm 61 is inclined so as to correspond to the retaining wall portion 37 on the other circumferential side of the mounting projection 21, and the circumferential length of the retaining wall portion 37. An engagement body portion 73 that is formed to have the same or substantially the same length as that of the engagement body portion and is bent inward, and a shaft that is integrally formed at the distal end of the engagement body portion 73 by bending toward one side in the axial direction. An axial direction portion 75 extending to one side in the direction (substantially one side in the axial direction), and the engagement body portions 73, 73 of the respective retaining engagement portions 71, 71 are retaining walls on the other circumferential side. 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 67 is set to be 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 bodies 67 and 67 is set to be substantially equal to the inner diameter of the pipe support section 17, the inner diameter of the bush main body 45 of the bush 43, or the outer diameter of the pipe body 47.

  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 75 of the retaining engagement portion 71 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, the wire retainer 5 has the shoulder main bodies 65, 65 attached to 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 on the outer surface. The stopper portions 66 and 66 are in contact with the circumferential end walls 31 and 31 of the mounting projections 21 and 21, and the stoppers 66 are connected to each other. The joining portions 71, 71 or the engaging main body portions 73, 73 are provided along the outer surface of the retaining wall portions 37, 37 on the other circumferential side of the mounting projections 21, 21, and the retaining wall portions 37, 37. Alternatively, they are brought into contact with each other and engaged to be attached to the retainer attaching portion 15 of the connector housing 3. The shoulder main body 65 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 75 outward from the other side entrance / exit 39 of the other side slit portion 27 and engage the retaining engagement portion 71 or the engagement main body portion 73 with the retaining wall portion 37 in the axial direction, The insertion of the engagement arm 61 is interrupted when the portion 75 approaches the other end in the circumferential direction of the other slit portion 27, and the engagement arm 61, for example, the axial portion 75 is positioned at the other side entrance 39. Thus, the insertion of the engagement arm 61 may be resumed after elastically deforming outward. As a result, the axial direction portion 75 comes out of the other side slit portion 27, and the engagement main body portion 73 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 66, 66 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 71 and 71 are engaged with the mounting projections 21 and 21 in the pull-out direction, the retainer mounting portion 15 is sandwiched between the pair of engagement arms 61 and 61 to the quick connector 1. It will be attached. The pair of engagement arms 61, 61 are inserted into the connector housing 3 with the arm main body 67 protruding from the engagement slits 23, 23. Here, even if the wire retainer 5 is further pushed in at this attachment position by the contact between the stopper portions 66 and 66 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 combined arms 61 and 61 do not open so as to pass the annular engaging 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 61 and 61, more specifically, the pair of arm main body portions 67 and 67 extend in parallel with each other without spreading. Thus, the retainer is 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 75 enters the other side entrance 39. The interval between the arm main body portions 67 and 67 of the wire retainer 5 or the interval between the arm main body portions 67 and 67 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 61, 61 or the arm main body portions 67 and 67 are opened so as to allow passage of the bush 43, or the engaging arms 61 and 61 or the arm main body portions 67 and 67 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 fitted 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.

  When the bush 43 is pushed into the seal holding portion 19 until it abuts on the stepped portion 56 (see FIG. 6a), the portion 76 of the connector housing 3 or the seal holding portion 19 corresponding to the engagement recess 58 of the bush 43 is driven. The engagement protrusion 59 is formed by recessing inward with a tool (not shown) (see FIG. 6b). The engaging recess 58 of the bush 43 is initially rectangular in cross section. However, since the seal holding portion 19 is recessed in a semicircular cross section, the engaging protrusion 59 enters the engaging concave portion 58 and is semicircular in cross section. Therefore, the engagement recess 58 is also deformed into a semicircular cross section corresponding to the engagement protrusion 59. Then, the engagement recess 58 and the engagement protrusion 59 are brought into close contact with each other with no gap in the cross section. Further, the engagement protrusion 59 enters the engagement recess 58 over the entire length in the circumferential direction. In this way, the engagement recess 58 and the engagement protrusion 59 are engaged with each other with no play in either the axial direction or the circumferential direction. From the viewpoint of workability, the engaging recess is formed on the outer surface of the closing portion 53 (the outer surface other than the passage portion 55) (see reference numeral 58A), and the portion where the engaging protrusion is formed is defined on the mounting protrusion 21. It may be located at the retaining wall portion 35 and / or 37 (see 76A).

  7 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. 8 is along a radial direction showing a state in which the pipe body 47 is connected to the quick connector 1. It is sectional drawing.

  The rubber hose 77 is fitted on the outer periphery of the hose connection portion 7 so that the tip end or the other axial end is close to the stepped portion 79 formed at 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 81 and is connected to the quick connector 1 in a sufficiently secured state. The fastening band 81 is a screw type, but a spring type can also be used. Furthermore, the hose 77 can be prevented from coming off by caulking the ring instead of the band.

  The pipe body 47 inserted and fitted into the quick connector 1 from the axially other end opening 83 of the retainer mounting portion 15 is made of, for example, metal, and one axial side has an annular engagement protrusion 49 on the outer peripheral surface. It is of the type configured as the insertion end 85. 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 engaging protrusion 49 increases the distance between the arm main body portions 67 and 67 of the wire retainer 5 (the imaginary state of the engaging arm 61 in FIG. 8). The quick connector 1 or the connector housing 3 until the insertion end portion 85 is inserted into the pipe insertion portion 9 of the connector housing 3 over the entire length. It is pushed into. The other-side annular surface 86 in the axial direction of the annular engagement protrusion 49 is formed so as to extend in the radial direction or the direction perpendicular to the axis, but the one-side annular surface in the axial direction of the annular engagement protrusion 49 receives the bush 43. When it abuts on the inner peripheral surface of the portion 51, it is coincident with or substantially coincides with the axial end 87 of the engagement slit 23 in the axial direction. When the connector housing 3 is normally inserted into the pipe insertion portion 9, it is returned to the parallel state in a snap-like manner by the elastic return force, and the annular engagement protrusion 49 or the annular engagement so as to prevent the pipe body 47 from coming off. It snap-engages with the axially other side annular surface 86 of the mating protrusion 49.

  One end in the axial direction of the insertion end portion 85 of the pipe body 47 passes through the O-ring 41 and reaches the pipe support portion 17, and the pipe body 47 or the insertion end portion 85 of the pipe body 47 and the quick connector 1 or the 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 85 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. It should be noted that the annular engagement protrusion 49 of the pipe body 47 is securely snap-engaged with the engagement arms 61 and 61 or the arm main body portions 67 and 67, and the snap operation of the engagement arm 61 or the arm main body portion 67 is performed. When the annular surface of one side in the axial direction of the annular engagement projection 49 is accommodated in the bush 43 so that the sliding does not become dull due to sliding with the annular engagement projection 49, the other side in the axial direction of the annular engagement projection 49 You may comprise so that an annular surface may be located in the one axial direction a little rather than the axial direction one end 87 of the engagement slit 23. FIG.

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

  When removing the pipe body 47 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. 8) to apply a pulling force (retraction force). (See arrow A in FIG. 8). Then, the wire retainer 5 slides the engagement main body portion 73 of each engagement arm 61 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 engagement arms 61 and 61 gradually open while moving in the retracting direction. When the wire retainer 5 continues to be pulled, the arm main body portion 67 abuts against 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 61 and 61 are open to such an extent that the annular engagement protrusion 49 of the pipe body 47 can pass through. Here, the axial portion 75 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 protrusion 21 (more specifically, the bending of the axial portion 75). The starting end may contact, engage and slide with the outer surface of the retaining wall part 37), and the entire axial part 75 may slide on the outer surface of the retaining wall part 37.

  Further, in this retracted state, the distal end of the engagement main body portion 73 of the retaining engagement portion 71 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 75 does not enter the connector housing 3. The direction portion 75 (bending start end or bending start end side of the axial direction portion 75) 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 75 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 pressed strongly in the attachment direction, and the axial direction portion 75 of the retaining engagement portion 71 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 75 is moved outside and the front-end | tip of the engaging part main body 73 of the retaining engagement part 71 is pushed out from the other side slit part 27 on the outer surface of the retaining wall part 37. The wire retainer 5 smoothly moves to the attachment position by the elastic return force that attempts to return the engaging arms 61 and 61 in parallel.

  The quick connector of the present invention is an automobile piping or the like and has an excellent sealing property against a pipe body, and connects the hose and the pipe body.

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 a figure which shows the engagement process of an engagement recessed part and an engagement protrusion part. 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 for demonstrating a motion of the wire retainer of a quick connector.

Explanation of symbols

1 Quick connector 3 Connector housing 5 Wire retainer (Retainer means)
7 Hose connection (connection)
41 O-ring (seal member)
47 Pipe body 49 Annular engagement protrusion 43 Bush 58 Engagement recess 59 Engagement protrusion

Claims (4)

A cylindrical connector housing having a connecting portion connected to a hose on one side in the axial direction, retainer means provided on the other side in the axial direction of the connector housing, and an annular shape disposed in the connector housing A seal member, and an annular bush fitted into the connector housing to hold down the seal member, and is formed at the insertion end when the insertion end of the pipe body is inserted. A quick connector in which an annular engagement protrusion and the retainer means are engaged with each other, and a gap between the insertion end and the connector housing is sealed with the seal member,
An engagement recess is formed in advance on the outer periphery of the bush,
The quick connector according to claim 1, wherein the connector housing is formed with an engagement protrusion that protrudes inward so as to engage with the engagement recess of the bush after the bush is fitted.   The quick connector according to claim 1, wherein the connector housing is made of metal.   The quick connector according to claim 1, wherein the engagement protrusion is formed by denting a wall portion of the connector housing from the outside to the inside. A plurality of the engaging recesses are formed on the outer periphery of the bush with a circumferential interval.
4. The quick connector according to claim 1, wherein a plurality of the engagement protrusions are formed in the connector housing so as to correspond to the engagement recesses and are spaced apart in the circumferential direction. .

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