JP2005344828A - Joining tool of metallic pipe with rubber hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a rotation preventive means for preventing reduction in airtightness by abrasion of a part with a simple constitution by an easy manufacturing technology, by mutually irrotationally connecting a metallic pipe and a cylindrical socket in a joining tool for connecting the metallic pipe having a relatively thin diameter and the thin thickness with a pressure rubber hose. <P>SOLUTION: Spools 12 and 13 are formed by swelling the outer periphery of the metallic pipe 1 in two places, and are butted against butting parts 14 and 15 arranged on an outside end surface 10 and an inside end surface 11 of an end wall 5 of the cylindrical socket 4. A fitting projection part 18 projected in one and/or other spools 12 and 13, and is fitted in a fitting recessed part 17 arranged on a wall surface of one and/or other butting parts 14 and 15 by communicating with an insertion port 8. The rubber hose 2 is installed on the outer periphery of a connecting part 3 of the metallic pipe 1 in an installation chamber 7, and this rubber hose 2 and the connecting part 3 are caulked and fixed by a cylindrical caulking part 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fitting of a metal tube and a rubber hose for connecting a relatively thin and thin metal tube and a pressure-resistant rubber hose used as a supply path for oil supply, air supply, etc. to automobiles, various mechanical devices, etc. It is.

  Conventionally, a fitting with a metal tube and a rubber hose that connects a relatively small diameter, thin metal tube and a pressure-resistant rubber hose used as a supply path for oil supply, air supply, etc. to automobiles and various mechanical devices is patented. As shown in Document 1, a metal tube for connecting a rubber hose and an insertion port through which the metal tube is inserted are provided on the end wall, and a rubber hose mounting chamber is formed facing the insertion port. There were some that consisted of a cylindrical socket. In this conventional product, after inserting the metal tube into the insertion port of the cylindrical socket, the outer periphery of the metal tube is spooled to form a spool, and these two spools are formed on the outer end surface of the end wall of the cylindrical socket and The metal tube and the cylindrical socket are fixed integrally by abutting against the inner end surfaces. The clamping force that clamps and fixes the cylindrical socket with these two spools prevents the metal tube from coming out of the insertion port and allows the metal tube and the cylindrical socket to rotate relative to each other in the circumferential direction. Trying to prevent. Then, in the mounting chamber of the cylindrical socket, the rubber tube is connected to the connecting portion at the tip of the metal tube, and the cylindrical caulking portion of the cylindrical socket is caulked to connect and fix the metal tube and the rubber hose. Yes.

  Moreover, in patent document 2, a spool is formed only in one place on the outer periphery of the metal tube, and this spool is abutted against the outer end surface of the end wall of the cylindrical socket. Further, in the cylindrical socket, the inner surface of the insertion port through which the metal tube is inserted is formed as a conical surface having a large inner end surface side, and the metal tube is expanded corresponding to the conical surface, and is formed on the outer periphery of the metal tube. By forming a tapered portion and engaging the tapered portion with the conical surface, the metal tube can be prevented from coming off in the direction of the outer end surface. The engagement between the tapered portion and the conical surface and the spool abutted against the outer end surface make it possible to fix the metal tube and the cylindrical socket together in an easily separable manner, and to clamp the tapered portion and the spool. The force tried to prevent relative rotation of the metal tube and the cylindrical socket.

  On the other hand, in Patent Document 3, a part of the metal tube is formed to have a smaller diameter than the main body to form an annular groove, and this annular groove is inserted into the insertion port of the cylindrical socket. Furthermore, the metal tube and the cylindrical socket are fixed by forming small irregularities having knurled eyes on the outer periphery of the annular groove, and fixing the end wall of the cylindrical socket to the outer periphery of the annular groove. Then, the concave and convex portions bite into the inner periphery of the insertion opening of the cylindrical socket, thereby preventing relative rotation between the metal tube and the cylindrical socket and firmly fixing the metal tube and the cylindrical socket.

Furthermore, the pipe joint of Patent Document 4 is different in that a socket provided with a connecting portion for connecting to a mating member and a connecting portion (nipple) for connecting a rubber hose, and a rubber hose mounting chamber are arranged on the outer periphery of the connecting portion of this socket. It is formed of a cylindrical sleeve having a U-shaped cross section, which is formed and has a socket assembly hole formed at the center thereof. A plurality of step portions are formed between the connecting portion and the connection portion of the socket, and a plurality of slits are formed in the assembly holes of the cylindrical sleeve corresponding to the step portions. The socket is inserted into the mounting hole of the cylindrical sleeve and the connecting portion of the socket is arranged in the mounting chamber. After engaging the step portion of the socket and the slit, the step portion is rolled and deformed so as to bite into the slit. Thus, the socket and the cylindrical sleeve are connected and fixed so as not to rotate. Thereafter, a rubber hose is connected to the connecting portion in the mounting chamber, and the cylindrical sleeve is caulked and fixed to connect and fix the connecting portion of the socket and the rubber hose.
JP 57-57988 A Japanese Patent Laid-Open No. 2003-314772 JP 61-65989 A Japanese Examined Patent Publication No. 7-1073

  However, Patent Document 1 prevents friction between the metal tube and the cylindrical socket by friction force caused by clamping two spools, and Patent Document 2 prevents friction between one spool and a tapered portion. When a strong rotational torque is applied in use, the metal tube and the cylindrical socket are relatively rotated, and the contact portions of each other may be worn. Due to this wear, the connection stability of each component is deteriorated, the airtightness of the connection portion between the metal tube and the rubber hose is lowered, and internal fluid may be leaked.

  Further, in Patent Document 3, since the end wall of the cylindrical socket is caulked and fixed to the outer periphery of the metal tube, the core circularity of the metal tube may be deteriorated. In this case, too, the airtightness of the connection portion with the rubber hose is low. There is a risk that the internal fluid may leak and the internal fluid may leak. It is not easy to caulk and fix the cylindrical socket to the outer periphery of the metal tube so as to keep the core degree of the metal tube high, because it requires advanced manufacturing techniques and precise alignment. In addition, the durability against strong rotational torque is not assured simply by biting a small uneven part with knurled eyes into the inner periphery of the insertion opening of the cylindrical socket, and the metal tube and the cylindrical socket can be rotated relatively. There was sex. Due to this rotation, the inner periphery of the insertion opening and the uneven portion are worn, and there is a possibility that the airtightness of the connection portion between the metal tube and the rubber hose by the cylindrical socket is impaired.

  Further, in Patent Document 4, it is difficult to completely close the slit while rolling and deforming the stepped portion of the socket so as to bite into the slit of the cylindrical sleeve. . Further, since the socket and the cylindrical sleeve are formed as separate members, there is a possibility that the airtightness in the mounting chamber may be deteriorated as compared with the integrated Patent Document 1 and Patent Document 2, and the socket and the cylindrical sleeve. The connection strength between the slit and the stepped portion may be damaged by a strong rotational torque. As a result, the airtightness between the connecting portion and the rubber hose is also lowered, and there is a possibility that internal fluid may leak. Moreover, since the socket provided with the connection part with a rubber hose was used separately instead of the metal pipe, the product cost was high.

  The present invention is intended to solve the above-described problems, and prevents the metal tube and the cylindrical socket from rotating with respect to a strong rotational torque in a joint between the metal tube and the rubber hose. It is possible to prevent the occurrence of problems such as leakage of internal fluid by preventing deterioration of the airtightness of the connection portion between the metal tube and the rubber hose due to wear of parts. Further, this rotation preventing means can be obtained at a low cost with a simple manufacturing technique and a simple configuration.

  In order to solve the above-described problems, the first invention provides a metal tube and an insertion port for inserting the metal tube in the end wall and facing a side of the insertion port to provide a rubber hose mounting chamber. A cylindrical socket made of metal having a U-shaped cross section formed, and the outer end surface and inner end surface of the end wall of this cylindrical socket are abutted against a spool formed by expanding the outer periphery of the metal tube at two locations. One and / or the other abutting portion, and one or a plurality of fitting recesses in the circumferential direction are provided on the wall surface of the one and / or the other abutment portion, and one and / or at a position corresponding to the fitting recess. The other spool is provided with a fitting convex portion, and the fitting convex portion is fitted into the fitting concave portion, thereby connecting the metal tube and the cylindrical socket to each other in a non-rotatable manner. Connecting portion provided at the mounting chamber position of the metal tube protruding from the side insertion port Outer peripheral rubber hose was attached to, and a connecting portion with the rubber hose, those composed as possible caulked by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.

  In addition, the second invention is a metal tube having a U-shaped cross section in which a metal tube and an insertion port through which the metal tube is inserted are provided on the end wall and a rubber hose mounting chamber is formed facing one side of the insertion port. A cylindrical socket, and the outer end surface of the end wall of the cylindrical socket is used as an abutting portion with a spool formed by expanding the outer periphery of the metal tube at one place, and the insertion provided on the end wall of the cylindrical socket The inner peripheral surface on the inner end surface side of the mouth is formed as a conical surface having a large diameter on the inner end surface side, and a corresponding conical surface corresponding to the conical surface of the insertion port is formed on the outer periphery of the metal tube, and the outer surface that abuts the spool One or a plurality of fitting recesses in the circumferential direction are provided on the wall surface and / or the conical surface of the abutting portion of the end face, and the spool and / or the corresponding conical surface are provided at positions corresponding to the fitting recesses. By providing a fitting convex part and fitting this fitting convex part into the fitting concave part, The metal tube and the cylindrical socket are connected to each other in a non-rotatable manner, and a rubber hose is attached to the outer periphery of the connecting portion provided at the mounting chamber position of the metal tube protruding from the insertion port on the inner end surface side of the metal tube. The rubber hose and the connecting portion can be fixed by caulking with a cylindrical caulking portion provided on the outer periphery of the mounting chamber.

  The third invention is a metal tube having a U-shaped cross section in which a metal tube and an insertion port through which the metal tube is inserted are provided on the end wall and a rubber hose mounting chamber is formed facing one side of the insertion port. The cylindrical socket consists of a cylindrical socket, and the outer end surface of the end wall of the cylindrical socket serves as an abutting portion with a spool formed by expanding the outer periphery of the metal tube at one location, and is provided on the end wall of the cylindrical socket. The inner peripheral surface on the inner end surface side of the insertion port is formed into a conical surface having a large diameter on the inner end surface side, and a corresponding conical surface corresponding to the conical surface of the insertion port is formed on the outer periphery of the metal tube. The cross-sectional shape perpendicular to the axial direction is oval, oval or polygonal to provide a non-circular part, and the oval, oval or polygonal corresponding non-circular part corresponding to the non-circular part of this insertion port is made of metal Metal tube and cylindrical socket formed on the outer periphery of the tube and inserted through the insertion port Are connected to each other in a non-rotatable manner, and a rubber hose is attached to the outer periphery of the connecting portion provided at the mounting chamber position of the metal tube protruding from the insertion port on the inner end surface side of the metal tube. The cylindrical caulking portion provided on the outer periphery of the mounting chamber can be fixed by caulking.

  In addition, the fourth invention is a metal tube having a U-shaped cross section in which a metal tube and an insertion port through which the metal tube is inserted are provided on the end wall and a rubber hose mounting chamber is formed facing one side of the insertion port. A cylindrical socket, and the outer end surface and the inner end surface of the end wall of the cylindrical socket are abutting portions with a spool formed by expanding the outer periphery of the metal tube at two locations, and one and / or the other The wall surface of one and / or the other abutting portion that abuts the spool is recessed into an elliptical shape, an oval shape, or a polygonal shape to form an insertion recessed portion, and an elliptical shape projecting corresponding to the insertion recessed portion, By engaging an oval or polygonal spool in the insertion recess, the metal tube and the cylindrical socket are connected to each other in a non-rotatable manner, and the metal tube protruding from the insertion port on the inner end surface side of the metal tube A rubber web is provided on the outer periphery of the connecting portion provided at the mounting chamber position. The scan is attached, and a connecting portion with the rubber hose, those composed as possible caulked by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.

  Further, the cylindrical socket may be formed with at least one fitting recess on the conical surface, and an engaging fitting protrusion corresponding to the fitting recess on the corresponding conical surface of the metal tube.

  Further, the cylindrical socket is provided with at least one fitting recess that communicates with the insertion port on the wall surface of the abutting portion that abuts the spool, and the fitting convex portion of the spool provided at a position corresponding to the fitting recess, You may make it fit in a fitting recessed part.

  A reinforcing inner pipe may be attached to the inner surface of the connecting portion of the metal pipe.

  Moreover, it is good also as an engaging part by providing an annular unevenness | corrugation in the connection part of a metal tube.

  Since the present invention is configured as described above, in the fitting of a metal tube and a rubber hose for connecting a relatively thin and thin metal tube and a pressure-resistant rubber hose, Since the cylindrical socket is held by abutting the two protruding spools against the abutting surface, separation of the metal tube and the cylindrical socket is prevented regardless of the pulling force in any direction with respect to the metal tube. I can do things. Furthermore, by fitting the fitting convex portion provided on the spool into the fitting concave portion provided on the wall surface of the abutting portion, the metal tube and the cylindrical socket can be connected to each other in a non-rotatable manner. Become. Therefore, even if a strong rotational torque is applied to the metal tube or the cylindrical socket, it is possible to prevent the mutual rotation of the metal tube or the cylindrical socket. Therefore, it is possible to obtain a fitting having a highly reliable airtightness and durability that does not cause leakage. In addition, this high-quality product can be formed simply by providing a spool and fitting convex part on a metal tube, and providing a fitting concave part on a cylindrical socket. It becomes possible to form.

  In the second aspect of the invention, the metal tube is inserted into the cylindrical socket by abutting the conical surface with the corresponding conical surface, so that the metal tube and the cylindrical socket maintain a highly accurate concentricity. It is possible to make a connection while it is possible, and a reliable connection without difficulty is possible. In addition, the pulling force in the direction of the connecting portion with respect to the metal tube corresponds to the spool hitting the outer end surface of the end wall of the cylindrical socket, and the pulling force with respect to the metal tube in the direction separating the spool and the end wall is Since the corresponding conical surface of the metal tube abuts against the conical surface of the insertion port having a large diameter on the inner end surface side, separation between the cylindrical socket and the metal tube can be satisfactorily prevented. Furthermore, the metal tube and the cylindrical socket are formed by fitting the fitting convex portion provided on the spool of the metal tube or the corresponding conical surface into the fitting concave portion provided on the abutting portion or the conical surface of the cylindrical socket. Can be connected to each other in a non-rotatable manner. Therefore, it is possible to prevent mutual rotation due to strong rotational torque, and to suppress the wear of the contact portion between the metal tube and the cylindrical socket, and it is possible to prevent the internal fluid from leaking and provide a reliable airtightness. It is possible to inexpensively form a fitting with durability and durability with simple technology and a small number of man-hours.

  In the third aspect, the conical surface and the corresponding conical surface are abutted, and the metal tube and the cylindrical socket can be connected with high accuracy with a high degree of concentricity and without difficulty. In addition, the pulling force in the direction of the connecting portion with respect to the metal tube corresponds to the spool hitting the outer end surface of the end wall of the cylindrical socket, and the pulling force with respect to the metal tube in the direction separating the spool and the end wall is Since the corresponding conical surface of the metal tube abuts against the conical surface of the insertion port having a large diameter on the inner end surface side, separation between the cylindrical socket and the metal tube can be satisfactorily prevented. Furthermore, the metal tube and the cylindrical socket may be connected to each other so as not to rotate by inserting the elliptical portion or the polygonal portion of the metal tube into the insertion port formed in an elliptical or polygonal cross section. It becomes possible. Therefore, it is possible to prevent mutual rotation due to strong rotational torque, and to suppress the wear of the contact portion between the metal tube and the cylindrical socket, and it is possible to prevent the internal fluid from leaking and provide a reliable airtightness. It is possible to inexpensively form a fitting with durability and durability with simple technology and a small number of man-hours.

  Further, in the fourth invention, since the cylindrical socket is sandwiched by abutting the two spools projecting on the metal pipe against the abutting surface, no matter which direction the pulling force acts on the metal pipe, Separation of the metal tube and the cylindrical socket can be prevented. Further, the metal tube and the cylindrical socket are non-rotatably connected to each other by engaging a triangular spool with the recessed portion provided in a triangular recess on the inner end surface of the cylindrical socket. Things will be possible. Therefore, it is possible to prevent mutual rotation due to strong rotational torque, and to suppress wear of the contact portion between the metal tube and the cylindrical socket, and to provide a highly reliable airtight system that does not cause internal fluid leakage. It is possible to inexpensively form a fitting with durability and durability with simple technology and a small number of man-hours.

  1 to 4, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. (1) is a metal pipe, which is used as a supply path for oil supply, air supply, etc. to automobiles and various mechanical devices. It is relatively thin and thin. The metal pipe (1) is formed by subjecting a raw pipe having the same diameter from one end to the other end to have a certain process, and one end serves as a connecting portion (3) with the rubber hose (2). The metal tube (1) is coated with a resin film (not shown) except for the connecting portion (3) with the rubber hose (2), and the metal tube (1) is resistant to corrosion and impact. May be increased.

  A cylindrical socket (4) made of a metal material for connecting the metal pipe (1) and the rubber hose (2) includes an end wall (5) for inserting the metal pipe (1), a metal pipe (1), A cylindrical caulking portion (6) for caulking and fixing to the outer periphery of the rubber hose (2) is provided to form a U-shaped cross section. A fitting chamber (7) for the metal tube (1) and the rubber hose (2) is provided in the crimping portion (6), and an insertion port (through which the metal tube (1) is inserted into the end wall (5) ( 8) is open. Further, the metal tube (1) inserted through the insertion port (8) has an outer circumference of 2 on the outer end surface (10) and inner end surface (11) side of the end wall (5) of the cylindrical socket (4). The spools (12) and (13) are formed by bulging out the portions. The one and other spools (12), (13) are provided on the outer end surface (10) and the inner end surface (11) of the end wall (5). The cylindrical socket (4) is clamped and fixed by two spools (12) and (13) so as not to be separated. As shown in FIG. 3, the inner end surface (11) of the end wall (5) is provided with an insertion recess (16) by making the outer periphery of the insertion port (8) into a cylindrical shape, and this insertion recess (16). The other spool (13) is molded inside, and the other spool (13) is abutted against the wall surface of the insertion recess (16) as the abutting portion (15).

  Further, as shown in FIGS. 1 and 3, fitting recesses (17a) and (17b) communicating with the insertion port (8) are provided in the circumferential direction in the one and the other abutting portions (14) and (15). A plurality of fitting protrusions (18a) and (18b) are provided on one and the other spools (12) and (13) at positions corresponding to the fitting recesses (17a) and (17b). The fitting recesses (17a) and (17b) are recessed with a partial cone shape, and the corresponding fitting convex portions (18a) and (18b) project in a partial cone shape. Then, as shown in FIG. 1, by fitting these fitting projections (18a) and (18b) into the fitting recesses (17a) and (17b), the metal tube (1) and the cylindrical socket (4) are fitted. Can be connected to each other in a non-rotatable manner. The fitting recesses (17a) and (17b) and the fitting projections (18a) and (18b) are part of a cone in the first embodiment, but are part of a sphere, cylinder, polygonal pyramid, etc. It may be formed in the shape of

  Next, in order to connect the metal pipe (1) and the cylindrical socket (4), first, a reinforcing inner pipe (20) is inserted into the metal pipe (1), and then a rolling roll is inserted. An engagement portion (21) with the rubber hose (2) is formed by providing an annular unevenness on the connection portion (3) of the metal tube (1) by means of (not shown). And a metal pipe (1) is inserted in the insertion port (8) of a cylindrical socket (4), and a connection part (3) is arrange | positioned in a mounting chamber (7). Next, as shown in FIG. 4, the main body of the metal tube (1) is held by the chuck (22) through the formation interval of one spool (12) between the outer wall (10) of the end wall (5). The spool punch (23) is fixed between the connecting portion (3) side of the metal pipe (1) and the inner end surface (11) of the end wall (5) via the other spool (13) formation interval. Deploy.

  Then, the spool punch (23) is driven in the axial direction from the connecting portion (3) side while being held by the chuck (22), so that the end wall (as shown in FIG. Spools (12) and (13) are formed on the outer end surface (10) side and the inner end surface (11) side of 5), and strongly abut against one and the other abutting portions (14) and (15). The cylindrical socket (4) is firmly clamped and fixed by the two spools (12) and (13), and the pulling force in the direction of the connecting portion (3) or the pulling force in the opposite direction acts on the metal pipe (1). Even if one or the other spool (12) (13) hits one or the other abutment (14) (15) of the cylindrical socket (4), the metal tube (1) is prevented from coming off. Therefore, both are not easily separated.

  Simultaneously with the formation of the spools (12) and (13), the spools (12) and (13) are deformed corresponding to the fitting recesses (17a) and (17b) provided in the abutting portions (14) and (15). Thus, a plurality of fitting projections (18a) and (18b) are formed, and as shown in FIGS. 1 and 2, each fitting projection (18a) and (18b) are placed in the fitting recesses (17a) and (17b). The metal tube (1) and the cylindrical socket (4) are connected and fixed so that they cannot rotate with each other.

  Then, a rubber hose (2) is attached to the outer periphery of the connecting portion (3) of the metal tube (1) located in the attachment chamber (7), protruding from the inner end face (11) side of the insertion port (8). The cylindrical caulking portion (6) provided on the outer periphery of (7) is fixed by caulking from the outer periphery toward the axial direction, so that the metal tube (1) and the rubber hose (2) are connected via the cylindrical socket (4). ) Can be fixed. Moreover, since this connection fixation forms the annular engaging part (21) in the connection part (3) of the metal pipe (1), the rubber hose (2) is attached to the annular engaging part (21) by caulking. The metal pipe (1) and the rubber hose (2) are firmly connected by biting in.

  Thus, the metal tube (1) and the rubber hose (2) are firmly connected by the caulking portion (6) of the cylindrical socket (4), and the metal tube (1) and the cylindrical socket (4). Are firmly connected and fixed without being separated or rotated from each other, so that the metal tube (1) and the rubber hose (2) can be connected with high reliability and airtightness. Further, the fitting between the fitting convex portions (18a) and (18b) and the fitting concave portions (17a) and (17b) prevents mutual rotation of the metal tube (1) and the cylindrical socket (4). Can do.

  Even when a strong rotational torque acts on the metal tube (1) or the like in use, the fitting projections (18a) and (18b) are surely bulged into the fitting depressions (17a) and (17b). Rotational resistance is increased, and the effect of preventing mutual rotation can be enhanced. Therefore, it is possible to prevent wear of the contact portion between the metal tube (1) and the cylindrical socket (4) and to maintain a highly reliable airtightness between the metal tube (1) and the rubber hose (2) for a long time. Possible to obtain a highly durable product.

  In the first embodiment, the fitting recesses (17a) and (17b) are provided in the one and the other abutment portions (14) and (15), and the fitting protrusions are provided in the one and the other spools (12) and (13). (18a) (18b) is provided, but only one or the other abutting part (14) (15) is provided with a fitting recess (17a) (17b), and one or the other spool is correspondingly provided. (12) The fitting protrusions (18a) and (18b) may be provided only on (13). Also, a plurality of fitting recesses (17a) (17b) and fitting projections (18a) (18b) are provided in the circumferential direction, but if it is not necessary to consider too much torque, the fitting recesses (17a) (17b) and only one fitting protrusion (18a) (18b) may be provided, and a simpler formation is possible.

  Next, a second embodiment in which the second invention is implemented will be described with reference to FIGS. In Example 2, only one spool (12) that abuts against the abutting portion (14) provided on the outer end surface (10) of the end wall (5) is formed on the metal pipe (1). On the other hand, the inner peripheral surface on the inner end surface (11) side of the insertion port (8) opened in the end wall (5) of the cylindrical socket (4) is changed to a conical surface (24) having a larger diameter on the inner end surface (11) side. The corresponding conical surface (25) corresponding to the conical surface (24) of the insertion port (8) is formed on the outer periphery on the inner end surface (11) side of the metal tube (1).

  Further, as shown in FIG. 7, a U-groove fitting is radially formed from the shaft core portion to the outer wall surface of the outer end surface (10) against which the one spool (12) abuts. A plurality of recesses (17c) are formed in communication with the insertion opening (8). And the fitting convex part (18c) is provided in the spool (12) in the position corresponding to this fitting recessed part (17c). Further, as shown in FIG. 7, a plurality of fitting recesses (17d) having a connecting shape of a triangular pyramid and a cone are formed in the circumferential direction on the conical surface (24) of the insertion port (8). A fitting convex portion (18d) corresponding to the concave portion (17d) is provided on the corresponding conical surface (25) of the metal tube (1). Then, the fitting convex part (18c) of the spool (12) is fitted into the fitting concave part (17c) of the abutting part (14), and the fitting convex part (18d) of the corresponding conical surface (25) is conical. The metal tube (1) and the cylindrical socket (4) can be connected to each other in a non-rotatable manner by being fitted in the fitting recess (17d) of the surface (24).

  In order to provide the corresponding conical surface (25) on the metal pipe (1) as described above, the connecting part (3) for connecting the rubber hose (2) with the main body of the metal pipe (1) held by the chuck (22). ) Side is formed by punching the enlarged diameter punch (26). FIG. 8 is a cross-sectional view showing a state in which the diameter-enhancing punch (26) is driven into the metal tube (1), the corresponding conical surface (25) is provided, and then the diameter-enlarging punch (26) is pulled out from the metal tube (1). FIG. As shown in FIG. 8, the diameter-enlarging punch (26) is provided with a conical surface forming portion (27) for forming a corresponding conical surface (25) of the metal tube (1). ) Protrudes from the outer periphery of the projection forming portion (28d) for forming the fitting projection (18d). Therefore, the corresponding conical surface (25) is formed on the metal pipe (1) by driving the diameter-expansion punch (26), and at the same time, the fitting convex portion (18d) is formed on the outer periphery of the corresponding conical surface (25). Will be formed.

  After inserting the reinforcing inner pipe (20) into the metal pipe (1) provided with the corresponding conical surface (25), the connecting part (3) of the metal pipe (1) is formed by a rolling roll (not shown). ) Is provided with an annular unevenness to form an engaging portion (21) with the rubber hose (2). Then, the metal tube (1) is inserted into the insertion port (8) of the cylindrical socket (4), the conical surface (24) of the insertion port (8) and the corresponding conical surface (25) of the metal tube (1). And the connecting portion (3) is disposed in the mounting chamber (7). Next, as shown in FIG. 9, the main body of the metal tube (1) is held and fixed by the chuck (22) through the formation interval of the spool (12) between the outer wall (10) of the end wall (5). . In this state, by driving the spool punch (23) from the connecting portion (3) side, as shown in FIG. 5, the spool (12) is formed on the outer periphery of the metal tube (1), and the outer end surface (10) is abutted. It hits part (14) strongly. At the same time, the spool (12) is deformed to form a fitting convex portion (18c) corresponding to the U-shaped fitting concave portion (17c) formed in the abutting portion (14). As shown in FIGS. 5 and 6, the mating convex portion (18c) is fitted into the fitting concave portion (17c).

  By forming as described above, when a pulling force in the direction of the connecting portion (3) with respect to the metal tube (1) is applied, the spool (12) is the abutting portion of the outer end surface (10) of the end wall (5). Pulling out is prevented by hitting (14). Further, when a pulling force is applied to the metal pipe (1) in a direction separating the spool (12) and the end wall (5), the conical surface of the insertion port (8) having a large diameter on the inner end surface (11) side. The corresponding conical surface (25) of the metal tube (1) abuts on (24), and separation between the cylindrical socket (4) and the metal tube (1) is prevented. The insertion of the metal tube (1) into the insertion port (8) of the cylindrical socket (4) is performed by abutting the conical surface (24) and the corresponding conical surface (25) as described above. It becomes easy to connect the metal tube (1) and the cylindrical socket (4) while maintaining a highly accurate concentricity, and the metal tube (1) and the cylindrical socket (4) are easy and reliable. Connection is possible. Further, the fitting between the fitting recesses (17c) and (17d) and the fitting projections (18c) and (18d) improves the relative rotation between the metal tube (1) and the cylindrical socket (4). It can be prevented.

  As described above, the rubber hose (2) is connected to the connecting portion (3) of the metal pipe (1) connected to the cylindrical socket (4), and the cylindrical caulking of the cylindrical socket (4) is performed as in the first embodiment. By staking a plurality of parts (6) from the outer circumference toward the axial center direction, the cylindrical socket (4), metal pipe (1) and rubber hose (2) can be reliably secured while maintaining highly reliable airtightness. The connection can be fixed.

  In the second embodiment, the fitting concave portion (17c) and the fitting convex portion (18c) are provided on the spool (12) and the abutting portion (14), respectively, and the conical surface (24) and the corresponding conical surface are provided. (25) is also provided with a fitting recess (17d) and a fitting projection (18d), so that even if a strong rotational torque acts, it prevents mutual rotation and prevents airtightness due to wear of parts. Reduction can be effectively prevented. However, when there is no concern that an excessively strong rotational torque acts, the fitting recess (17c) and the fitting protrusion (18c) may be provided only in the spool (12) and the abutting portion (14). However, only the conical surface (24) and the corresponding conical surface (25) may be provided with a fitting recess (17d) and a fitting protrusion (18d), making it easier to manufacture each component and connect each other. Can be done.

  In the second embodiment, the spool (12) of the metal pipe (1) is formed only on the outer end surface (10) side of the end wall (5). However, as another different embodiment, the inner wall of the end wall (5) A spool (13) may also be formed on the end surface (11) side to abut against the abutting portion (15). Further, by holding the end wall (5) from both sides by the one and the other spools (12) and (13), the effect of preventing the metal tube (1) from being pulled out can be further enhanced. Also in this case, an insertion recess (16) for inserting and engaging the other spool (13) may be provided on the inner end surface (11) of the end wall (5), or the insertion recess (16) may be provided. The spool (13) may be abutted against the flat inner end surface (11) not provided.

  Next, a third embodiment in which the third invention is implemented will be described with reference to FIGS. In the third embodiment, as in the second embodiment, the outer periphery of the end wall (5) of the cylindrical socket (4) is placed on the abutting portion (14) on the outer periphery of the metal tube (1). One spool (12) projecting from is abutted. Then, a conical surface (24) having a large diameter on the inner end surface (11) side is formed in the insertion port (8) of the end wall (5), and a metal tube (1) formed corresponding to the conical surface (24). By engaging the corresponding conical surface (25), the metal tube (1) and the cylindrical socket (4) can be connected while maintaining a highly accurate concentricity. Even if the pulling force in any direction acts on the metal pipe (1), one spool (12) hits the abutting part (14) or the conical surface (24) of the insertion port (8). The corresponding conical surface (25) of the metal tube (1) comes into contact with the metal tube (1), and separation between the metal tube (1) and the cylindrical socket (4) can be prevented.

  Further, as a means for preventing the rotation of the metal tube (1) and the cylindrical socket (4), in the third embodiment, the cylindrical socket (4) has the outer end surface (10) of the end wall (5). Between the conical surface (24), the cross-sectional shape perpendicular to the axial direction of the insertion port (8) is formed into an ellipse, thereby forming a non-circular portion (30). Then, a corresponding non-circular portion (31) is formed in the metal tube (1) corresponding to the elliptical non-circular portion (30) of the insertion port (8), and the corresponding non-circular portion (31) is non-exposed. By inserting the circular portion (30), the metal tube (1) and the cylindrical socket (4) can be connected to each other in a non-rotatable manner. Further, when a rotational torque acts on the metal tube (1), the corresponding non-circular portion (31) of the metal tube (1) abuts against the non-circular portion (30) of the insertion port (8) and rotation is prevented. At the same time, the rotational torque can be distributed over a wide contact surface between the non-circular part (30) and the corresponding non-circular part (31), preventing wear of parts, and the metal tube (1) and rubber hose (2). Reliable and airtightness can be maintained.

  Next, another embodiment 4 in which the third invention is implemented will be described with reference to FIGS. In the fourth embodiment, as in the third embodiment, one end of the metal tube (1) is placed on the abutting portion (14) formed on the outer end surface (10) of the end wall (5) of the cylindrical socket (4). The cylindrical socket (4) and the metal tube are inserted by engaging the corresponding conical surface (25) of the metal tube (1) with the conical surface (24) of the insertion port (8). (1) is connected and fixed inseparably. And as a means for preventing the rotation of the metal tube (1) and the cylindrical socket (4), it is provided between the outer end surface (10) and the conical surface (24) of the end wall (5) of the cylindrical socket (4). A non-circular portion (30) is formed on the metal tube, and a non-circular portion (31) corresponding to the non-circular portion (30) is provided on the metal tube (1). As shown in FIG. 15, the non-circular portion (30) and the corresponding non-circular portion (31) are formed in a substantially triangular shape with smooth corner portions.

  Even in such a connection structure, the metal tube (1) and the cylindrical socket (4) are non-rotatably connected to each other by the engagement of the non-circular portion (30) and the corresponding non-circular portion (31). It becomes possible to do. Therefore, even when a strong rotational torque acts on the metal tube (1), the corresponding non-circular portion (31) of the triangle of the metal tube (1) hits the non-circular portion (30) of the triangle of the insertion port (8). , Can prevent the rotation. Then, wear of each component can be prevented, and highly reliable airtightness between the metal tube (1) and the rubber hose (2) can be maintained.

  Moreover, in the said Example 3 and Example 4, although the non-circular part (30) and the corresponding non-circular part (31) are respectively formed in an oval shape and a substantially triangular shape, they correspond to the non-circular part (30). As long as mutual rotation with the non-circular portion (31) can be prevented, it may be formed in a polygon such as a quadrangle or a pentagon, or may be formed in an oval shape. Further, in order to further enhance the effect of preventing the rotation by the action of the non-circular portion (30) and the corresponding non-circular portion (31) of the third and fourth embodiments, the abutting portion (14 ) Is provided with a fitting recess (17) that communicates with the insertion port (8), and the fitting projection (18) that fits into the fitting recess (17) protrudes from the spool (12). good. Further, a fitting recess (17) is provided on the conical surface (24) of the insertion port (8), and the fitting projection (18) fitted in the fitting recess (17) is made to correspond to the metal pipe (1). You may project from a conical surface (25).

  Next, a fifth embodiment of the fourth invention will be described with reference to FIGS. In the fifth embodiment, similar to the first embodiment, the metal tube (1) is inserted into the insertion port (8) of the cylindrical socket (4), and the metal held and fixed by the chuck (22) (not shown). Spool punches (23) are driven into the pipe (1) in the axial direction to form spools (12) and (13) on the outer periphery of the metal pipe (1) as shown in FIG. The spool (12) (13) is strongly abutted against one and the other abutting portions (14) (15) provided on the outer end surface (10) and the inner end surface (11) of the end wall (5). The metal tube (1) and the cylindrical socket (4) are connected and fixed so that the metal tube (1) can be prevented from coming off in any direction.

  In Example 5, the inner end surface (11) of the end wall (5) of the cylindrical socket (4) is used as a means for preventing the rotation of the metal tube (1) and the cylindrical socket (4). As shown in the figure, an insertion recess (16) is provided by being provided in a triangular shape, and the wall surface of the insertion recess (16) is used as an abutting portion (15) that abuts the other spool (13). By forming the insertion recess (16) in a triangular shape in this way, the spool punch (23) is driven into the metal tube (1) held by the chuck (22) as described above, and the spool (12) (13) is inserted. When forming, the other spool (13) is formed in a triangular shape corresponding to the triangular insertion recess (16), engages in the insertion recess (16), and abuts against the abutting portion (15) It will be a thing.

  Therefore, when rotational torque acts on the metal tube (1), the triangular spool (13) hits the inner wall of the insertion recess (16), so that the relative relationship between the metal tube (1) and the cylindrical socket (4) is increased. Effective rotation can be effectively prevented. As a result, wear of parts is prevented, and the airtightness and connection strength of the connection portion between the metal tube (1) and the rubber hose (2) can be maintained well.

  In the fifth embodiment, the other spool (13) projecting in a triangular shape is engaged in the triangular insertion recess (16) provided only on the inner end surface (11). As a different embodiment, an insertion recess (16) is provided on the outer end surface (10) of the end wall (5), and one spool (12) protrudes in a triangular shape and engages in the insertion recess (16). Also good. Also, the insertion recess (16) is provided on both the inner end surface (11) and the outer end surface (10), and one and the other spool (13) formed corresponding to the insertion recess (16) are connected to each insertion recess ( 16) It may be engaged in the interior, and the durability against rotational torque can be further improved.

  Further, the insertion recess (16) and the spool (12) (13) may be not only a triangular shape but also a polygonal shape such as a square, a rectangle, a pentagon, etc. It is good also as a shape, an ellipse shape, etc. Also in the fifth embodiment, at least one fitting recess (17) is provided in the abutting portions (14) and (15), and the spools (12) and (13) are provided corresponding to the fitting recesses (17). A fitting convex portion (18) may be formed, and the fitting convex portion (18) may be fitted into the fitting concave portion (17), and an elliptical, oval, polygonal insertion concave portion ( In combination with the engagement of 16) and spools (12) and (13), the effect of preventing rotation can be further enhanced.

The cross-sectional perspective view which shows the connection state of the metal pipe of Example 1, a cylindrical socket, and a rubber hose. AA sectional view taken on the line AA of FIG. Sectional drawing (a) of a cylindrical socket, and its BB sectional view (b). FIG. 3 is a cross-sectional perspective view showing a halfway of driving a spool punch into a metal tube held by a chuck for forming a spool on the metal tube connected to a cylindrical socket. The cross-sectional perspective view which shows the connection state of the metal pipe of Example 2, a cylindrical socket, and a rubber hose. The CC sectional view taken on the line of FIG. Sectional drawing (a) of a cylindrical socket and its DD sectional view (b). Sectional drawing which shows the state immediately after forming a corresponding conical surface and a fitting convex part in a metal pipe with a diameter expansion punch. FIG. 3 is a cross-sectional perspective view showing a halfway of driving a spool punch into a metal tube held by a chuck for forming a spool on the metal tube connected to a cylindrical socket. The cross-sectional perspective view which shows the connection state of the metal pipe of Example 3, a cylindrical socket, and a rubber hose. EE sectional view taken on the line of FIG. Sectional drawing (a) of a cylindrical socket, and its FF sectional view (b). The cross-sectional perspective view which shows the connection state of the metal pipe of Example 4, a cylindrical socket, and a rubber hose. GG sectional view taken on the line of FIG. Sectional drawing (a) of a cylindrical socket, and its HH sectional view (b). Sectional perspective view which shows the connection state of the metal pipe of Example 5, a cylindrical socket, and a rubber hose. The II sectional view taken on the line of FIG. Sectional drawing (a) of a cylindrical socket and its JJ sectional view (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Rubber hose 3 Connection part 4 Cylindrical socket 6 Crimp part 7 Mounting chamber 8 Insertion port 10 Outer end surface 11 Inner end surface 12 Spool 13 Spool 14 Abutting part 15 Abutting part 16 Insertion recessed part 17 Fitting recessed part 20 Inner pipe 21 Engaging portion 24 Conical surface 25 Conical surface 30 Non-circular portion 31 Non-circular portion

Claims (8)

  It consists of a metal tube and a metal cylindrical socket with a U-shaped cross section in which an insertion port through which this metal tube is inserted is provided in the end wall and facing the one side of the insertion port to form a rubber hose mounting chamber. The outer end surface and inner end surface of the end wall of the cylindrical socket are abutting portions with a spool formed by expanding the outer periphery of the metal tube at two locations, and on the wall surface of one and / or the other abutting portion, One or a plurality of fitting recesses communicating with the insertion opening are provided in the circumferential direction, and one and / or the other spool is provided with a fitting projection at a position corresponding to the fitting recess, and the fitting projection is fitted. The metal tube and the cylindrical socket are non-rotatably connected to each other by fitting in the mating recess, and the metal tube protruding from the insertion port on the inner end surface side of the metal tube is provided at the mounting chamber position. A rubber hose is attached to the outer periphery of the The joint member between the metal tube and the rubber hose, characterized in that the possible caulked by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.   It consists of a metal tube and a metal cylindrical socket with a U-shaped cross section in which an insertion port through which this metal tube is inserted is provided in the end wall and facing the one side of the insertion port to form a rubber hose mounting chamber. The outer end surface of the end wall of the cylindrical socket is used as an abutting portion with a spool formed by expanding the outer periphery of the metal tube at one location, and the inner periphery on the inner end surface side of the insertion port provided in the end wall of the cylindrical socket The inner end surface side is formed into a conical surface having a large diameter, a corresponding conical surface corresponding to the conical surface of the insertion port is formed on the outer periphery of the metal tube, and the wall surface of the abutting portion of the outer end surface that abuts the spool, and In the conical surface, one or more fitting recesses communicating with the insertion opening are provided in the circumferential direction, and a fitting protrusion is provided on the spool and / or the corresponding conical surface at a position corresponding to the fitting recess. By fitting the fitting convex part into the fitting concave part, the metal tube and the cylindrical socket are connected. Are connected to each other in a non-rotatable manner, and a rubber hose is attached to the outer periphery of the connecting portion provided at the mounting chamber position of the metal tube protruding from the insertion port on the inner end surface side of the metal tube. A fitting for a metal tube and a rubber hose characterized in that it can be fixed by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.   It consists of a metal tube and a metal cylindrical socket with a U-shaped cross section in which an insertion port through which this metal tube is inserted is provided in the end wall and facing the one side of the insertion port to form a rubber hose mounting chamber. The outer end surface of the end wall of the cylindrical socket is used as an abutting portion with a spool formed by bulging the outer periphery of the metal tube at one place, and on the inner end surface side of the insertion port provided in the end wall of the cylindrical socket. The inner peripheral surface is formed into a conical surface with a large diameter on the inner end surface side, a corresponding conical surface corresponding to the conical surface of this insertion port is formed on the outer periphery of the metal tube, and the cross-sectional shape perpendicular to the axial direction of the insertion port is an ellipse. A non-circular part is formed in a shape, oval or polygonal shape, and an elliptical, oval or polygonal corresponding noncircular part corresponding to the noncircular part of this insertion port is formed on the outer periphery of the metal tube and inserted. Inserting through the mouth makes the metal tube and the cylindrical socket non-rotatable with each other A rubber hose is attached to the outer periphery of the connecting portion provided at the mounting chamber position of the metal tube protruding from the insertion port on the inner end surface side of the metal tube, and the rubber hose and the connecting portion are provided on the outer periphery of the mounting chamber. A fitting for a metal tube and a rubber hose characterized in that it can be fixed by a cylindrical caulking portion.   It consists of a metal tube and a metal cylindrical socket with a U-shaped cross section in which an insertion port through which this metal tube is inserted is provided in the end wall and facing the one side of the insertion port to form a rubber hose mounting chamber. The outer end surface and inner end surface of the end wall of the cylindrical socket serve as abutting portions with a spool formed by expanding the outer periphery of the metal tube at two locations, and one and / or the other spool is abutted against each other and / or Alternatively, the wall surface of the other abutting part is recessed in an oval, oval or polygonal shape to form an insertion recess, and an oval, oval or polygonal spool projecting corresponding to this insertion recess is provided. By engaging in the insertion recess, the metal tube and the cylindrical socket are non-rotatably connected to each other, and the metal tube protruding from the insertion port on the inner end surface side of the metal tube is provided at the mounting chamber position. Attach a rubber hose to the outer periphery of the A hose and the connecting portion, the joint member between the metal tube and the rubber hose, characterized in that the possible caulked by a cylindrical caulking portion provided on the outer periphery of the mounting chamber.   4. The cylindrical socket according to claim 3, wherein at least one fitting recess is formed on the conical surface, and an engaging fitting protrusion corresponding to the fitting recess is formed on the corresponding conical surface of the metal tube. A fitting for metal pipes and rubber hoses.   The cylindrical socket is provided with at least one fitting recess that communicates with the insertion opening on the wall of the abutting part that abuts the spool, and the fitting protrusion of the spool provided at a position corresponding to the fitting recess is fitted. The fitting of the metal pipe and the rubber hose according to claim 3 or 4, wherein the fitting is fitted in the recess.   The metal pipe and rubber hose joint according to claim 1, 2, 3, 4, 5 or 6, wherein a reinforcing inner pipe is attached to the inner surface of the connecting portion of the metal pipe.   The joint part of a metal tube and a rubber hose according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that an annular concavo-convex portion is provided in the connecting part of the metal tube to form an engaging part.

Images