JP2006322609A - Pipe fixing structure and pipe fixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the pipe fixing structure and the pipe fixing method that can get more fixing power than a certain level by the simple structure. <P>SOLUTION: In the pipe fixing structure to fix a pipe 2 by deforming it by applying the power to press the pipe 2 axially against the ejector 1 that the pipe 2 is fixed, the pipe 2 can be inserted axially into an ejector 1 and an enlarged-diameter part 1a of larger diameter than the outside diameter is formed and a thin-walled part 2a is formed in the inner peripheral part of the pipe 2. It comprises the first protrusion part (6) to be made by plastic deforming a thin-walled part 2a of the pipe 2 with the press power and the pipe 2 is the pipe fixing structure to be fixed in the ejector 1 because this first protrusion part 6 adjusts to the enlarged-diameter part 1a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fixing structure for a pipe that is plastically deformed by applying an external force to the pipe and fixed to a member to be fixed, and a fixing method for the pipe.

  Conventional pipe fixing structures and fixing methods are known in which a pipe is caulked and fixed to a fixing target member that fixes the pipe. In addition, the prior art document about this prior art is not known. The pipe fixing structure and fixing method will be described below.

  As shown in FIG. 14, the pipe 100 is previously formed with a protruding portion 104 at a predetermined position of the outer peripheral portion 105, and the fixed portion 103 has a caliber portion 106 into which the pipe 100 with the protruding portion 104 can be inserted. And a stopper portion 108 formed in a diameter with which the tip portion 107 of the pipe 100 abuts, and a pressing piece 101 extending from the diameter portion 106.

  As a method of fixing the pipe 100 to the fixing target member 103, the O-ring 102 is placed on the aperture portion 106, the tip portion 107 of the pipe 100 is brought into contact with the stopper portion 108, and the lower side surface of the protruding portion 104 is used. Hold the O-ring 102. In this state, when the pressing piece 101 is pressed downward by a punch member (not shown), the pressing piece 101 falls and presses the upper side surface of the protruding portion 104, and the pipe 100 is fixed to the fixing target member 103. Will be.

Moreover, when fixing a pipe to a fixing object member, there is a method of plastically deforming the pipe into a predetermined shape. As such a method, a conventional technique such as Patent Document 1 is known. According to this method, when the tip end portion of the pipe held by the chuck is pressed in the axial direction by the punch member having the concave portion of the predetermined shape, the portion of the pipe tip end machining allowance is plastically flowed. Will be deformed into a shape along the predetermined shape of the recess formed in the punch member.
JP 2003-336560 A

  However, in the caulking and fixing of the above prior art, since the pressing piece 101 protruding to the outside is formed on the fixing target member 103, the pressing piece 101 must be formed by cutting the fixing target member 103 or the like. However, there was a problem that the solid target member before processing became large. Moreover, in the process of forming the pressing piece 101 that protrudes to the outside, the amount of cutting is large and the labor of the process is also required.

  The present invention has been made in view of the above-described problem, and does not perform processing of a shape that protrudes to the outside of a member to be fixed, and has a simple structure and a fixing structure of a pipe that can secure a fixing force of a certain level or more. It aims to provide a method.

  In order to achieve the above object, the present invention employs the following technical means.

  According to the first aspect of the present invention, the pipe (2) is deformed by applying a force pressing the pipe (2) in the axial direction to the fixing target members (1, 8) to which the pipe (2) is fixed. In the fixing structure of a pipe to be fixed, the pipe (2) can be inserted in the fixing target member (1, 8) in the axial direction, and the diameter-expanded portion formed larger than the outer diameter dimension of the pipe (2) ( 1a) and a first protruding portion (6) formed by deforming the thin-walled portion (2a) formed on the pipe (2) by the pressing force, and the first protruding portion (6) has an enlarged diameter portion ( 1a).

  According to the first aspect of the present invention, the diameter-enlarged portion is formed in the member to be fixed, the thin portion is formed in the pipe, and then the pipe is fixed by applying a pressing force in the axial direction to be buckled. Therefore, the fixing process can be simplified by a simple fixing structure, and the fixing of the pipe that can obtain a fixing force exceeding a certain level can be realized.

  The invention according to claim 2 is the pipe fixing structure according to claim 1, wherein the pipe (2) is separated from the pipe (2) at the boundary between the fixed pipe (2) and the outer surface of the fixing target member (1, 8). It is characterized by comprising second projecting portions (7, 15) projecting radially outward and integrated with the fixing target members (1, 8). According to the second aspect of the present invention, the fixing force between the pipe and the member to be fixed can be further strengthened by the overhang of the second projecting portion.

  According to a third aspect of the present invention, in the pipe fixing structure according to the second aspect, the second protrusion (15) has a substantially uniform thickness so as to follow the shape of the outer surface of the member to be fixed (1). It is formed. According to the third aspect of the present invention, the second projecting portion at the boundary between the pipe and the outer surface of the member to be fixed is formed so as to follow the shape of the outer surface of the member to be fixed. In addition, it is possible to reduce the occurrence of edge portions such as burrs in the second protrusion.

  According to a fourth aspect of the present invention, in the pipe fixing structure according to any one of the first to third aspects, the cross-sectional shape of the enlarged diameter portion (1a) in the axial direction of the pipe (2) is It is characterized by having a tapered shape. According to the fourth aspect of the present invention, since the cross-sectional shape of the enlarged diameter portion in the axial direction of the pipe is tapered outward, the first projecting portion of the pipe is in close contact with the tapered shape. As a result, the gap between the fixing target member and the pipe is reduced, and the adhesion and fixing force can be improved.

  The invention of the pipe fixing method according to claim 5 includes a step of forming a thin portion (2a) on the inner peripheral portion of the pipe (2), and a fixing target member (1, 8) for fixing the pipe (2). Inside, the pipe (2) can be inserted in the axial direction, the step of forming the enlarged diameter portion (1a) at a position corresponding to the thin-walled portion (2a), and the pipe (2) to be fixed members (1, 8) A step of deforming the thin-walled portion (2a) so as to protrude outwardly by applying a force that is inserted into the shaft and pressing in the axial direction so as to match the enlarged-diameter portion (1a). And

  According to the fifth aspect of the present invention, after the relatively simple processing of forming the thin wall portion in the pipe and forming the enlarged diameter portion in the member to be fixed, the step of buckling the pipe by pressing in the axial direction. By performing the above, it is possible to obtain a pipe fixing method that is easy to process, has high buckling process quality, and has excellent fixing force.

  According to a sixth aspect of the present invention, in the pipe fixing method according to the fifth aspect, the pipe (2) inserted into the fixing target member (1, 8) is subjected to a pressing force in the axial direction. The outer periphery of (2) is grasped by the chuck (3, 13), and the chuck (3, 13) is moved in the axial direction. According to the invention described in claim 6, since the pressing force applied to the pipe can be easily adjusted by moving the chuck in the axial direction by a machine, the amount of deformation of the thin portion and the degree of adhesion between the thin portion and the enlarged portion Can be easily adjusted.

  The invention according to claim 7 is the pipe fixing method according to claim 5 or 6, wherein the thin-walled portion (2a) is deformed to match the enlarged-diameter portion (1a), and then the pipe (2) is continued. A step of buckling the pipe (2) at the boundary between the fixed pipe (2) and the outer surface of the fixing target member (1, 8) is performed by applying a pressing force.

  According to the seventh aspect of the present invention, the second projecting portion projecting outward is formed by buckling the pipe at the boundary between the fixed pipe and the outer surface of the member to be fixed. And the fixing method of the pipe which can further strengthen the fixing force of the fixing object member is obtained.

  According to an eighth aspect of the present invention, in the pipe fixing method according to the seventh aspect, the chuck (3, 13) that moves in the axial direction while holding the outer peripheral portion of the pipe (2) is the pipe (2). The end surface (14) opposite to the outer surface of the fixing target member (1, 8) is formed so as to follow the shape of the outer surface of the fixing target member (1, 8).

  According to the eighth aspect of the present invention, it is possible to reduce the occurrence of an edge portion such as a flash at the boundary portion between the pipe and the outer surface of the member to be fixed in the buckling step, and the pipe buckling portion is desired. A pipe fixing method that can be formed to a thickness of 5 mm is obtained.

  The invention according to claim 9 is the pipe fixing method according to claim 8, wherein the outer surface of the member to be fixed (1) has a curved shape, the side of the chuck (13) that grips the pipe (2), and The end surface (14) on the fixing target member (1, 8) side is formed by an inclined surface or a curved surface that follows the curved shape. According to the ninth aspect of the invention, there is obtained a pipe fixing method capable of making the boundary portion between the pipe and the outer surface of the fixing target member closer to the curved surface of the fixing target member.

  According to a tenth aspect of the present invention, in the pipe fixing method according to any one of the fifth to ninth aspects, the pipe (2) is inserted into the pipe (2), and the pipe ( 2) is inserted into the fixing target member (1, 8) and applied with a force pressing in the axial direction to deform the thin-walled portion (2a) so as to protrude outward, thereby expanding the diameter-expanded portion (1a). A matching process is performed.

  According to the tenth aspect of the present invention, in a state where the support member is inserted into the pipe, the pipe is plastically flowed by applying a pressing force to the pipe so that the pipe tends to protrude outward during the plastic flow. Therefore, the pipe is further deformed into a desired shape.

  The invention of the pipe fixing method according to claim 11 is characterized in that an insertion opening into which the pipe (11) can be inserted is formed in the fixing target member (1) for fixing the pipe (11), and the inside of the fixing target member (1). Forming an enlarged opening (1a) larger than the insertion opening and the outer shape of the pipe (11), and inserting the pipe (11) into the fixing target member (1) from the insertion opening to the outer surface of the pipe (11). By holding the pipe (11) only in the axial direction, the outer peripheral part of the pipe (11) is projected outward and deformed so as to match the enlarged diameter part (1a). And a process.

  According to the eleventh aspect of the present invention, a pipe fixing method having a fixing force of a certain level or more can be obtained by a simple method that does not process the shape of the object to be fixed protruding outward.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
The pipe fixing structure and fixing method according to the first embodiment of the present invention fix a pipe to a metal device through which a fluid flows as an object to be fixed, and is used in a refrigeration cycle as an example below. A case where the pipe is fixed to the ejector will be described. First, the configuration of the ejector and the configuration of the refrigeration cycle using the ejector will be described.

  FIG. 1 is a schematic diagram showing a refrigeration cycle for a vehicle using an ejector to which a pipe fixing structure and fixing method according to this embodiment are applied.

  A refrigeration cycle using this ejector is provided with a refrigerant circulation path 11 through which a refrigerant circulates, and a compressor 12 that sucks and compresses the refrigerant is disposed in the refrigerant circulation path 11.

  The compressor 12 is driven to rotate by a vehicle traveling engine (not shown) via a belt or the like. And the variable capacity type compressor which can adjust refrigerant | coolant discharge capability with the change of discharge capacity is used as the compressor 12. As shown in FIG. Here, the discharge capacity corresponds to the refrigerant discharge amount per rotation, and the discharge capacity can be changed by changing the refrigerant suction volume.

  The variable capacity compressor 12 is typically a swash plate type. Specifically, the refrigerant suction volume is changed by changing the piston stroke by changing the angle of the swash plate. The angle of the swash plate can be electrically controlled from the outside by changing the pressure (control pressure) of the swash plate chamber by the electromagnetic pressure control device 12a constituting the capacity control mechanism.

  A radiator 13 is disposed on the downstream side of the refrigerant flow of the compressor 12. The radiator 13 cools the high-pressure refrigerant by exchanging heat between the high-pressure refrigerant discharged from the compressor 12 and outside air (air outside the passenger compartment) blown by a cooling fan (not shown).

  An ejector 14 is disposed further downstream of the refrigerant flow than the radiator 13. The ejector 14 is a depressurizing unit that depressurizes the fluid and is a momentum transporting pump that transports the fluid by the entrainment action of the working fluid ejected at high speed.

  FIG. 2 is a schematic diagram showing a configuration of an ejector to which the pipe fixing structure and fixing method according to this embodiment are applied.

  The ejector 14 is arranged in the same space as the nozzle part 14a having a small passage area for narrowing the refrigerant flowing in from the radiator 13 and the refrigerant outlet of the nozzle part 14a, and receives the gas-phase refrigerant from the second evaporator 18 described later. A suction part 14c for sucking is provided.

In the nozzle portion 14a, a needle valve 14e for controlling the opening degree of the jet port is arranged coaxially with the jet port, and is arranged so as to be movable in the axial direction by the actuator 14f. Yes. Furthermore, on the downstream side of the nozzle portion 14a, a mixing portion 14d for mixing the refrigerant flowing in from the suction portion 14c and the refrigerant ejected from the nozzle portion 14a, and a diffuser portion for gradually increasing the passage area of the refrigerant to increase the pressure of the refrigerant 14b.

  The refrigerant that has flowed out of the diffuser portion 14 b of the ejector 14 flows into the first evaporator 15. The first evaporator 15 is installed, for example, in the ventilation path of the vehicle interior air conditioning unit and performs a cooling action for cooling the vehicle interior.

  Specifically, the vehicle interior conditioned air is blown to the first evaporator 15 by the electric blower 26 of the vehicle interior air conditioning unit, and the low-pressure refrigerant decompressed by the ejector 14 absorbs heat from the vehicle interior conditioned air in the first evaporator 15. By evaporating, the air-conditioning air in the passenger compartment is cooled and exhibits cooling performance. The gas-phase refrigerant evaporated in the first evaporator 15 is sucked into the compressor 12 and circulates again through the refrigerant circulation path 11.

  Further, in this refrigeration cycle, a first branch passage 16 is formed which branches at a portion between the radiator 13 and the ejector 14 in the refrigerant circulation path 11 and merges with the refrigerant circulation path 11 at the suction portion 14c of the ejector 14. ing.

  The first branch passage 16 is provided with a first flow rate adjusting valve 17 for adjusting the flow rate of the refrigerant and depressurizing the refrigerant. The first flow rate adjusting valve 17 can electrically adjust the valve opening. A second evaporator 18 is disposed downstream of the first flow rate control valve 17 in the refrigerant flow.

  The second evaporator 18 is installed, for example, inside a cool box mounted on a vehicle and performs a cooling action in the cool box. The air in the cool box is blown to the second evaporator 18 by the electric blower 27.

  The electromagnetic pressure control device 12a, the first blower 26, the second blower 27, the first flow rate control valve 17 and the like of the variable capacity compressor 12 are electrically controlled by a control signal from the ECU 25. ing.

  Next, as an example, a structure and method for fixing a pipe to the above-described ejector will be described. FIG. 3 is a cross-sectional view showing a state before pressing in the pipe fixing method of the present embodiment.

  First, a thin portion 2a is formed on the inner peripheral portion of the pipe 2 on one end side to be connected to the ejector 1 which is an example of a member to be fixed. The thin portion 2a is formed over the inner surface of the pipe 2 and is formed to have a thickness about 2/3 of the normal thickness of the pipe 2 at a portion where the thickness is formed to be the thinnest. The thin-walled shape in the pipe axial direction of the thin-walled portion 2a is not particularly limited, but it is useful in forming a first protrusion described later when it is tapered toward the radially outer side of the pipe. .

  The thin portion 2a is formed by cutting the inner peripheral portion of the pipe 2. For example, the pipe 2 is rotated so that the position of the pipe 2 does not move with a lathe (not shown), and a cutting tool (not shown) is applied to the inner peripheral portion of the rotating pipe 2 so that the pipe 2 is centrifuged in an amount to be cut. Send a byte. In this way, the thin portion 2a can be formed on the inner peripheral portion of the pipe 2 by a simple processing operation.

  In addition, a through-hole that communicates with the flow path 1 d is formed on the outer surface of the ejector 1, which is an example of a fixing target member, substantially orthogonal to the axial direction. The through hole is configured in the order of a retaining wall 1b, an enlarged diameter portion 1a, and a stopper wall 1c from the side close to the outer surface.

  The diameter of the retaining wall 1b is formed to be equal to the outer diameter of the pipe 2 to be fixed, and the pipe 2 can be inserted. The enlarged diameter portion 1a is formed so as to continuously increase its diameter from the retaining wall 1b, and the diameter of the enlarged diameter portion 1a is deformed by the plastic flow described later and the first protrusion is formed. When the portion is configured, the first projecting portion is formed in such a size that it can be closely attached.

  The stopper wall 1c is formed so as to connect a diameter portion formed to be equal to the outer diameter size of the pipe 2 from the enlarged diameter portion 1a toward the stopper wall 1c and a diameter portion smaller than the outer diameter size of the pipe 2. This is a tubular wall parallel to the axial direction of the ejector 1. The pipe 2 inserted into the through-hole of the ejector 1 is positioned with its movement in the axial direction of the pipe regulated by the contact of the tip surface 2b with the stopper wall 1c. Further, the radial position of the pipe is regulated by the diameter of the retaining wall 1b and the diameter part extending from the enlarged diameter part 1a toward the stopper wall 1c and formed to be equal to the outer diameter of the pipe 2. Will be positioned.

  In addition, such a through hole is formed by cutting in the same manner as the thin portion 2a of the pipe 2 described above. For example, as a method, a lathe (not shown) is used to rotate the ejector 1 around the axis of the through hole, and apply a bite (not shown) to the inner periphery of the through hole of the ejector 1 to properly A bite is fed in the axial direction of the ejector 1 by an appropriate amount to form a retaining wall 1b, an enlarged diameter portion 1a, and a stopper wall 1c. In this way, the enlarged diameter portion 1a is formed in the ejector 1 that is a member to be fixed by a simple processing operation. In this embodiment, the outer diameter of the pipe 2 is 6 to 10 mm in diameter, and the thickness of the tube of the ejector 1 is about 5 mm.

  The pipe 2 is made of a metal such as aluminum, an aluminum alloy, copper, or a copper alloy, and is made of a material that can be plastically flowed by applying an external force. On the other hand, the member to be fixed is made of metal such as aluminum, aluminum alloy, copper, copper alloy, iron, stainless steel, brass, etc., and is not limited to the homogeneous material in combination with the pipe 2, but is a heterogeneous material. It may be.

  With respect to the ejector 1 configured as described above, the support member 4 is inserted into the flow path 1 d in the ejector 1 to support the inner peripheral portion of the ejector 1 and to fix the ejector 1. Further, the pipe 2 is fixed by the chuck 3 with the support member 5 inserted into the pipe, supporting the inner peripheral portion thereof, and the axial center thereof being aligned with the center line of the through hole of the ejector 1. The pipe 2 is installed so as to be movable downward in the axial direction together with the chuck 3 by a pressurizing machine (pressing machine) (not shown) for driving the chuck 3.

  In addition, as shown in FIG. 4, it is also possible to fix a pipe in the axial direction of the member to be fixed. FIG. 4 is a cross-sectional view showing a state before pressing when fixing a pipe in the axial direction of a member to be fixed. In this case, a through hole similar to that of the above-described ejector 1 communicating with the flow path 8d from one end side in the axial direction of the fixing target member 8 is formed, and the retaining wall is sequentially formed from one end surface side of the fixing target member 8. 8b, the enlarged diameter portion 8a, and the stopper wall 8c are formed.

  Next, the process of pressing the pipe 2 against the ejector 1 in the axial direction of the pipe will be described. FIG. 5 is a cross-sectional view showing a state when the pipe is inserted into the member to be fixed from the state before the pipe shown in FIG. 3 is fixed. FIG. 6 is a cross-sectional view showing a state after the first protrusion is formed from the state shown in FIG.

  As shown in FIG. 5, the chuck 3 is moved downward in the axial direction of the pipe 2 by the pressurizer, and the pipe 2 enters the through hole until the tip of the pipe 2 comes into contact with the stopper wall 1 c. At this time, the thin-walled portion 2a is disposed at a position corresponding to the radially inner side with respect to the enlarged-diameter portion 1a formed in the ejector 1. The distance between the outer peripheral surface of the ejector 1 on the chuck 3 side and the lower end surface of the chuck 3 is secured to about 3 mm.

  Next, as shown in FIG. 6, when pressure is further applied by the pressurizer and the chuck 3 is further moved downward in the axial direction of the pipe 2, the plastic flow of the tissue is caused in the thin portion 2 a of the pipe 2. Occurring, the thin-walled portion 2a moves outward in the radial direction of the pipe 2, and is deformed until it is in close contact with the enlarged-diameter portion 1a to form the first protruding portion 6 (first buckling step). .

  At this time, since the cross-sectional shape of the enlarged diameter portion 1a in the axial direction of the pipe 2 is formed in a tapered shape toward the outside, deformation due to plastic flow of the thinner portion 2a is promoted, The adhesion degree of the outer surface of the enlarged diameter part 1a and the thin part 2a will improve. Further, the support member 5 inserted into the pipe 2 prevents the portion of the pipe 2 excluding the thin portion 2a from being deformed so that the flow path space in the pipe 2 is properly maintained, and the thin portion 2a The outward deformation in the radial direction is promoted.

  By forming the first projecting portion 6 in this way, the retaining wall 1b projecting radially inward of the pipe 2 regulates the upward movement of the first projecting portion 6 and the pipe 2 comes out. Therefore, the pipe 2 is fixed to the ejector 1.

  Further, in order to increase the fixing force, it is preferable to form the second protrusion 7 shown in FIG. 7, and the process of forming the second protrusion 7 will be described. FIG. 7 is a cross-sectional view showing a state where the second protrusion 7 is further formed from the state shown in FIG. FIG. 8 is a perspective view showing the second protrusion 7. After the first buckling step, the pipe 2 is continuously pressed against the ejector 1 by a pressurizer to increase the force. Then, the pipe 2 begins to buckle because it cannot withstand the force applied by the pressurizing machine, and the outer peripheral portion of the pipe 2 protrudes radially outward at the boundary between the outer surface of the ejector 1 on the chuck 3 side and the pipe 2. The protrusion 7 is formed (second buckling step).

  Then, when the pressing by the pressurizer is released, the grasping force to the pipe 2 by the chuck 3 is released, and the support member 5 inserted into the pipe 2 and the support member 4 in the ejector 1 are extracted, As shown in FIG. 8, a pipe 2 extending substantially at right angles in the axial direction of the ejector 1 is fixed to the outer peripheral surface of the ejector 1. The second projecting portion 7 is formed in a circular shape so as to surround the outer periphery of the pipe 2 at the boundary with the ejector 1, and is integrated with the outer surface of the ejector 1.

  Thus, since the 2nd protrusion part 7 is integrated with the ejector 1 and is formed so that it may protrude in the radial direction outward of the pipe 2, the fixing force to the ejector 1 of the pipe 2 is further strengthened. .

Moreover, in this embodiment, the force pressed by the pressurizer until the first protrusion 6 is formed is, for example, 9.8 × 10 ³ N or less, and after the first protrusion 6 is formed, The pressing force by the pressurizer until the second protrusion 7 is formed is about 1.9 to 4.0 × 10 ⁴ N. Even if a force pressing the pipe 2 against the ejector 1 works, the support member 4 inserted into the tube of the ejector 1 prevents the deformation of the ejector 1 and is appropriate even if a large force is applied by the pressurizer. The flow path 1d is secured.

  When the bent pipe is fixed to the fixing target member, as described above, the pressing force is applied to the pipe 2 against the ejector 1 that is the fixing target member with the support member 5 inserted into the pipe 2. After buckling and performing the first buckling process, or after performing the second buckling process to further improve the strength, the support member 5 is pulled out of the pipe 2 and the pipe 2 is bent to a desired curvature. Processing to be bent into a tube shape will be performed. By performing such a process, it becomes possible to fix the curved pipe to the fixing target member.

  As described above, according to the present embodiment, the expanded portion 1a in which the pipe 2 can be inserted in the axial direction and is formed larger than the outer diameter of the pipe 2 is formed in the ejector 1 (fixed member). The first protrusion 6 formed by forming a thin portion 2a on the inner peripheral portion of the pipe and plastically deforming the thin portion 2a by a force pressing the pipe 2 in the axial direction is a pipe that matches the enlarged diameter portion 1a. It has a fixed structure.

  With this configuration, the diameter-enlarged portion 1a is formed in the member to be fixed, the thin portion 2a is formed in the pipe 2, and then the pipe 2 is buckled to fix the pipe 2 to the member to be fixed. It is possible to realize a fixing structure that can obtain a reliable fixing force with a simple structure.

  In addition, at the boundary between the fixed pipe 2 and the outer surface of the ejector 1 (fixed target member), a second projecting portion 7 that protrudes from the outer peripheral portion of the pipe 2 and is integrated with the ejector 1 (fixed target member) is provided. A pipe fixing structure is preferable. When this configuration is adopted, the second projecting portion 7 is integrated with the ejector 1 (fixed target member) and projects outward in the radial direction, thereby further increasing the fixing force of the pipe 2 and the fixed target member 1. Can be strengthened.

  Moreover, it is preferable to form the cross-sectional shape of the enlarged diameter part 1a about the axial direction of the pipe 2 in the taper shape toward the radial direction outward of the pipe 2. As shown in FIG. When this configuration is adopted, the first projecting portion 6 of the pipe 2 plastically flows so as to be in close contact with the tapered shape that is the cross-sectional shape of the enlarged diameter portion 1a, and the gap between the fixing target member and the pipe is increased. It can reduce and can improve adhesiveness and fixing force.

  In addition, the pipe fixing method of the present embodiment includes the step of forming the thin portion 2a on the inner peripheral portion of the pipe 2, and the inside of the ejector 1 (fixed target member) to which the pipe 2 is fixed. By inserting the pipe 2 into the inside of the ejector 1 (fixed member) and applying a force that presses in the axial direction. The thin-walled portion 2a is deformed so as to protrude outward, and is matched with the enlarged-diameter portion 1a.

  According to this fixing method, the pipe 2 is pressed in the axial direction after a relatively simple process of forming the thin portion 2a on the pipe 2 and forming the enlarged diameter portion 1a on the ejector 1 (fixed member). By performing the step of bending, it is possible to obtain a pipe fixing method that is easy to process, has high buckling process quality, and has excellent fixing force.

  In addition, the pipe fixing method according to the present embodiment is obtained by deforming the thin-walled portion 2a by plastic flow so as to match the enlarged-diameter portion 1a, and then applying a force for pressing the pipe 2 to It is preferable to perform a step of buckling the pipe 2 at the boundary with the outer surface of the ejector 1 (fixed target member).

  When this fixing method is adopted, by forming the second projecting portion 7 projecting outward by buckling the pipe 2 at the boundary portion between the fixed pipe 2 and the outer surface of the member to be fixed. The fixing force between the pipe 2 and the ejector 1 (fixing target member) can be further strengthened.

  Further, in the pipe fixing method of the present embodiment, the thin-walled portion 2a is deformed by applying a force to press the pipe 2 against the ejector 1 (fixing target member) with the support member 5 inserted into the pipe 2. It is preferable to perform the process of making it. When this fixing method is adopted, the action of the pipe 2 trying to protrude outward during the plastic flow is strengthened, so that the deformation of the pipe 2 can be further promoted to have a desired shape.

  Further, the chuck 3 shown in FIG. 4 is formed so that the end surface on the side of the pipe 8 and the side of the pipe 8 follows the shape of the outer surface of the pipe 8. According to this configuration, the second protrusion formed at the boundary between the pipe 2 and the outer surface of the pipe 8 in the buckling step is hardly noticeable, and the thickness thereof can be formed as desired.

(Second Embodiment)
In this embodiment, in contrast to the method of fixing the pipe to the ejector of the first embodiment, the pipe 11 having no thin portion is inserted into the ejector 1 and installed at a predetermined position, and only the pipe 11 is axially disposed. A fixing method for deforming the pipe 11 by applying a pressing force of will be described. FIG. 9 is a cross-sectional view showing a state before the pipe 11 is pressed in the pipe fixing method of the present embodiment. FIG. 10 is a cross-sectional view showing a state after the first protrusion is formed from the state shown in FIG.

  As shown in FIG. 9, the pipe 11 is made of a material that can be plastically flowed by applying an external force of a certain level or more, like the pipe 2 of the first embodiment, but includes a thin-walled portion 2 a formed on the pipe 2. Not. As in the first embodiment, the ejector 1 includes a through hole that is substantially orthogonal to the axial direction and communicates with the flow path 1d. The through hole is formed with an insertion opening, a retaining wall 1b, an enlarged diameter portion 1a, and a stopper wall 1c in order from the outer surface of the pipe 2. The retaining wall 1b, the enlarged diameter portion 1a, and the stopper wall 1c are the same as those shown in the first embodiment in terms of shape, function, and processing method.

  With respect to the ejector 1 configured as described above, the support member 12 is inserted into the flow path 1d to support the inner peripheral portion of the ejector 1, and the ejector 1 is fixed. The support member 12 includes an insertion hole through which a support portion of the pressure punch material 10 described later can be inserted.

  The procedure for installing the pipe 2 on the ejector 1 is to insert the pipe 2 into the through hole from the insertion opening on the outer surface of the ejector 1 and push it in until the lower end of the pipe 2 comes into contact with the stopper wall 1c. Further, for the pipe 2, a support portion of the pressure punch material 10 is inserted into the pipe, and the inner peripheral portion of the pipe 2 is supported by the support portion of the pressure punch material 10, and its axis is ejected from the ejector 1. It arrange | positions so that it may correspond with the centerline of this insertion hole.

  The pressure punch material 10 has a punch portion having an outer dimension larger than that of the support portion supporting the inner peripheral portion of the pipe 2 at the upper portion, and the pressure punch material 10 has a lower end portion 10a of the punch portion due to gravity. By being in contact with the upper end of the pipe 2, it is integrated with the pipe 2.

  The guide member 9 restricts the movement of the pipe 2 in the radial direction and holds the outer surface of the pipe 2 so as to be movable in the axial direction. Next, the pipe 2 set in this way is buckled by pressurizing the punch portion of the pressure punch material 10. When the punch part is pressed downward by the press machine, the lower end part 10a of the punch part presses the upper end part of the pipe 2 downward in the axial direction.

  Further, when the pressure punch material 10 is pressed with a certain external force or more, the structure of the pipe 2 starts to plastically flow. As shown in FIG. 10, the plastic flow portion is a space formed between the inner surface of the enlarged diameter portion 1 a and the outer peripheral surface of the pipe 2, and the plastic flow portion is a support portion of the pressure punch material 10. Is supported radially inside so as to fill the space, and plastically flows outward in the radial direction so as to fill the space, and protrudes outward and deforms until it matches the enlarged diameter portion 1a.

  As described above, the pipe fixing method of the present embodiment forms an insertion opening into which the pipe 2 can be inserted into the ejector (fixed target member) 1, and the diameter of the expansion is larger than the insertion opening and the outer shape of the pipe 2 inside the ejector 1. The pipe 2 by applying a pressing force in the axial direction only to the pipe 2 with the pipe 2 inserted into the ejector 1 through the insertion opening and holding the outer surface of the pipe 2. And a step of deforming the outer peripheral portion of the outer peripheral portion so as to match the enlarged diameter portion 1a.

  When this pipe fixing method is employed, a simpler fixing method can be obtained in which the ejector 1 is not processed to have a shape protruding outward.

(Third embodiment)
In the present embodiment, a fixing method and a fixing structure capable of making the shape of the second protruding portion a desired shape with respect to the method of fixing a pipe to the ejector shown in the first embodiment will be described. FIG. 11 is a cross-sectional view showing a state before the second protrusion is formed in the pipe fixing structure and fixing method of the present embodiment. 12 is a cross-sectional view showing a state after the second protrusion is formed from the state shown in FIG.

  The pipe fixing method of the present embodiment is a first buckling step, that is, the first protrusion by deforming the thin-walled portion 2a so as to match the enlarged-diameter portion 1a with respect to the pipe fixing method of the first embodiment. The process up to forming the portion 6 is the same.

  In the present embodiment, the chuck 13 for gripping the pipe 2 and moving it in the axial direction has a configuration in which the end surface 14 on the side where the pipe 2 is gripped and on the ejector 1 side is formed along the shape of the outer surface of the ejector 1. To do. Moreover, it is preferable that the end surface 14 of the chuck 13 is formed as an inclined surface or a curved surface along a curved shape provided on the outer surface of the ejector 1.

  A process of pressing the pipe 2 against the ejector 1 in the axial direction using such a chuck 13 will be described. First, in a state where the distance between the outer peripheral surface of the ejector 1 on the chuck 13 side and the lower end surface of the chuck 13 is secured at least about 3 mm, the pipe 2 is fixed by the chuck 13 and the chuck 13 is moved downward in the axial direction of the pipe 2 by a pressurizer. The pipe 2 is moved into the through hole of the ejector 1 until the tip of the pipe 2 comes into contact with the stopper wall 1c. At this time, the thin-walled portion 2 a of the pipe 2 is disposed at a position corresponding to the radially inner side with respect to the enlarged diameter portion 1 a formed on the ejector 1.

  Further, when the pressure applied by the pressurizer is continuously applied to the chuck 13 and the chuck 13 is moved downward in the axial direction of the pipe 2, a plastic flow of the tissue occurs in the thin portion 2 a of the pipe 2 as shown in FIG. 11. The thin wall portion 2a moves outward in the radial direction of the pipe 2 and is deformed until it is brought into close contact with the enlarged diameter portion 1a to form the first protruding portion 6 (first buckling step).

  Next, the process of forming the second protrusion 15 shown in FIG. 12 will be described. After the first buckling step described above, in order to increase the force for pressing the pipe 2 against the ejector 1, the chuck 13 is further moved downward in the axial direction by the pressurizer. Then, the pipe 2 begins to buckle because it cannot withstand the force applied by the pressurizer, and the outer peripheral portion of the pipe 2 begins to protrude radially outward at the boundary portion between the outer surface of the ejector 1 on the chuck 13 side and the pipe 2.

  Then, the outer peripheral portion of the pipe 2 which has started to protrude is crushed by the end surface 14 of the chuck 13, and the portion protruding outward by plastic flow spreads along the curved shape of the outer surface of the ejector 1. The 2nd protrusion part 15 will be formed (2nd buckling process).

  Thus, the 2nd protrusion part 15 in the fixing structure of the pipe of this embodiment is formed by the substantially uniform thickness so that the shape of the outer surface of the ejector 1 may be followed. With this configuration, the joint portion at the boundary between the pipe 2 and the outer surface of the ejector 2 is less noticeable, and the occurrence of flash can be reduced.

  Further, the chuck 13 used in the pipe fixing method of the present embodiment is formed so that the end face 14 facing the outer surface of the ejector 1 on the side that holds the pipe 2 follows the shape of the outer surface of the ejector 1. With this configuration, it is possible to reduce the occurrence of flash at the boundary between the pipe 2 and the outer surface of the ejector 1, and to form the second buckling portion 15 to a desired thickness.

  Moreover, it is preferable that the end surface 14 of the chuck 13 used in the pipe fixing method of the present embodiment is formed as an inclined surface or a curved surface that follows the curved shape of the outer surface of the ejector 1. When this configuration is adopted, the boundary between the pipe 2 and the outer surface of the ejector 1 can be made closer to the curved surface of the ejector 1.

  Moreover, the 2nd protrusion part 15 of a desired shape can be formed by employ | adopting a favorite shape for the end surface 14 of the chuck | zipper 13. FIG.

It is a schematic diagram which shows the refrigeration cycle for vehicles using the ejector to which the fixing structure and fixing method of the pipe in 1st Embodiment are applied. It is a schematic diagram which shows the structure of the ejector to which the fixing structure and fixing method of a pipe in 1st Embodiment are applied. It is sectional drawing which shows the state before pressing a pipe in the fixing method of the pipe of 1st Embodiment. In the pipe fixing method of 1st Embodiment, it is sectional drawing which shows the state before a press in the case of fixing a pipe to the axial direction of a fixing object member. It is sectional drawing which shows a state when a pipe is inserted in the fixation object member from the state before fixing the pipe shown in FIG. FIG. 6 is a cross-sectional view showing a state after forming a first protrusion from the state shown in FIG. 5 in the pipe fixing method shown in the first embodiment. It is sectional drawing which shows the state after forming the 2nd protrusion part from the state shown in FIG. It is a perspective view which shows the 2nd protrusion part in the fixing structure of the pipe of 1st Embodiment. It is sectional drawing which shows the state before pressing a pipe in the fixing method of the pipe of 2nd Embodiment. It is sectional drawing which shows the state after forming the 1st protrusion part from the state shown in FIG. It is sectional drawing which shows the state before forming a 2nd protrusion part in the fixing structure and fixing method of the pipe of 3rd Embodiment. It is sectional drawing which shows the state after forming the 2nd protrusion part from the state shown in FIG. It is a perspective view which shows the 2nd protrusion part in the fixation structure of the pipe of 3rd Embodiment. It is sectional drawing which shows the fixing structure of the conventional pipe.

Explanation of symbols

1 Ejector (member to be fixed)
DESCRIPTION OF SYMBOLS 1a Diameter expansion part 2, 11 Pipe 3, 13 Chuck 2a Thin part 5 Support member 6 1st protrusion part 7, 15 2nd protrusion part 8 Piping (member to be fixed)
8a Expanded part

Claims (11)

Fixing the pipe that deforms and fixes the pipe (2) by applying a force pressing the pipe (2) in the axial direction to the fixing target members (1, 8) to which the pipe (2) is fixed Structure,
An enlarged diameter portion (1a) in which the pipe (2) can be inserted in the fixing target member (1, 8) in an axial direction and is larger than an outer diameter of the pipe (2);
A first protrusion (6) formed by deforming the thin portion (2a) formed on the pipe (2) by the pressing force,
The pipe fixing structure, wherein the first projecting portion (6) matches the enlarged diameter portion (1a).   Projecting radially outward from the pipe (2) at the boundary between the fixed pipe (2) and the outer surface of the fixing target member (1, 8) and integrated with the fixing target member (1, 8) The pipe fixing structure according to claim 1, further comprising a second projecting portion (7, 15).   The pipe fixing structure according to claim 2, wherein the second projecting portion (15) is formed with a uniform thickness so as to follow the shape of the outer surface of the fixing target member (1).   The cross-sectional shape of the said enlarged diameter part (1a) about the axial direction of the said pipe (2) is made into a taper shape toward an outer side, The one of Claims 1 thru | or 3 characterized by the above-mentioned. Pipe fixing structure. Forming a thin-walled portion (2a) on the inner peripheral portion of the pipe (2);
The pipe (2) can be inserted in the axial direction into the fixing target member (1, 8) to which the pipe (2) is fixed, and the diameter-increased portion (1a) at a position corresponding to the thin-walled portion (2a). )
By inserting the pipe (2) into the fixing target member (1, 8) and applying a force pressing in the axial direction, the thin portion (2a) is deformed so as to protrude outward, and A method of fixing the pipe, characterized by comprising a step of matching with the enlarged diameter portion (1a).   When an axial pressing force is applied to the pipe (2) inserted into the fixing target member (1, 8), the outer periphery of the pipe (2) is gripped by a chuck (3, 13), and the chuck 6. The pipe fixing method according to claim 5, wherein (3, 13) is moved in the axial direction.   After the thin-walled portion (2a) is deformed and matched with the enlarged-diameter portion (1a), the pipe (2) and the object to be fixed are fixed by applying a force that continuously presses the pipe (2). The method of fixing a pipe according to claim 5 or 6, characterized in that a step of buckling the pipe (2) at a boundary portion with the outer surface of the member (1, 8) is performed.   The chucks (3, 13) that move in the axial direction while holding the outer periphery of the pipe (2) face the outer surface of the fixing target member (1, 8) on the side that holds the pipe (2). The pipe fixing method according to claim 7, wherein the end face (14) is formed so as to follow the shape of the outer surface of the member to be fixed (1, 8).   The outer surface of the fixing target member (1) has a curved shape, and the end surface (14) of the chuck (13) on the side to grip the pipe (2) and the fixing target member (1, 8) side is The pipe fixing method according to claim 8, wherein the pipe fixing method is formed by an inclined surface or a curved surface along a curved shape.   With the support member (5) inserted into the pipe (2), the pipe (2) is inserted into the fixation target member (1, 8) and applied with an axial pressing force. The pipe according to any one of claims 5 to 9, wherein a step of deforming the thin-walled portion (2a) so as to protrude outward to match the enlarged-diameter portion (1a) is performed. Fixing method. An insertion opening into which the pipe (11) can be inserted is formed in the fixing target member (1) for fixing the pipe (11), and the insertion opening and the pipe (11) are formed inside the fixing target member (1). Forming a larger diameter portion (1a) larger than the outer shape;
The pipe (11) is inserted into the fixing target member (1) from the insertion opening and the outer surface of the pipe (11) is held, and only the pipe (11) is pressed in the axial direction. And a step of deforming the outer peripheral portion of the pipe (11) by projecting outward so as to match the enlarged diameter portion (1a).

Images