JP2006170395A - Pulsation absorbing hose structure and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulsation absorbing hose structure having stabilized quality and reduced cost by simplifying the processes of assembling a pulsation absorbing hose itself and being more freely designed to be piped at a position in a small vehicle body space without giving poor influences to pulsation absorbing performance or a total life, and to provide its assembling method. <P>SOLUTION: The pulsation absorbing hose structure comprises a rubber hose 3 fastened and fixed to the end of a pipe joint 2 with fastening force imparted via a socket 5 fixed to the end of the pipe joint 2 and a resin tube silencer 12 extending into the rubber hose. The socket 5 and the resin tube silencer 12 are both fixed to the end of the pipe joint with socket fastening force when fastening and fixing the socket to the end of the pipe joint. Its assembling method comprises fastening and fixing the rubber hose via the hose fastening socket to the pipe joint. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pulsation absorption hose structure typically used for, for example, a power steering hose of an automobile, and a method for assembling the pulsation absorption hose.

  In general, when a fluid such as oil is pumped from a fluid supply source such as a hydraulic pump, the fluid is pumped with pulsation due to fluctuations in the pump load, and the pulsating fluid is hose. There is a phenomenon that abnormal noise occurs when passing through.

  In order to solve this problem of abnormal noise generation, there has been proposed a pulsation absorbing hose that has a silencing effect by suppressing the generation of abnormal noise by attenuating pulsation while the fluid flows in the hose. (Patent Documents 1-4).

  In these pulsation absorption hoses shown in Patent Documents 1-4, in particular, when the pulsation absorption hose is connected to a pipe joint, the structure of the pulsation absorption hose and the pipe joint part is generally shown in FIG. It was as shown in a) and (b).

  That is, (a) and (b) of FIG. 3 are main part half cross-sectional views schematically showing a coupling structure of a conventional pulsation absorbing hose and a pipe joint part.

  As shown in FIGS. 3A and 3B, the pulsation absorbing hose 1 fixes the rubber hose 3 to the pipe joint 2 by crimping the end of the pipe joint 2 via a socket 5. An inner tube 4 is joined to the distal end of the pipe joint 2, and the inner tube 4 is cantilevered inside the rubber hose 3 and extends rightward in the drawing. Under such a structure, when the pulsating fluid passes through the inside of the hose, the pulsation is attenuated to suppress the above-described abnormal noise. The inner tube 4 is composed of a metal spiral tube or a resin tube.

  In such a conventional pulsation absorbing hose and pipe joint portion coupling structure, those conventional coupling methods will be described with reference to the schematic cross-sectional view of the coupling portion shown in FIGS. First, the socket 5 which is a caulking metal fitting is fastened and fixed to the end of the pipe joint 2. There are two methods for fastening and fixing the socket 5, which is a caulking fitting, to the end of the pipe joint 2. First, the first method is shown in FIGS. 4 (a) and 3 (a). As shown in FIG. 4, there is a method of fixing the bottom of the socket 5 by crimping. In FIG. 4A, 9 is a crimping die used for the crimping, and F <b> 1 is for fixing the bottom of the socket 5. The caulking force is shown as a model. In FIG. 3A, reference numeral 6 denotes a caulking concave portion generated by caulking connection of the socket 5.

  As a second method, the bottom of the socket 5 can be fixed by pressing as shown in FIG. 4B. F3 shows the pressing force as a model, and as shown in FIG. 3B, in this case, there is no caulking concave portion of the socket as shown in FIG. 3A.

  Thereafter, the inner tube 4 is fastened and fixed to the tip of the end of the pipe joint 2 by caulking.

  In order to crimp the inner tube 4 at this time, as shown in FIGS. 4A and 4B, a metal insert nipple 8 is attached to the tip of the inner tube 4 as necessary. Thus, a higher caulking effect can be obtained. F2 shows this caulking force as a model, and 10 is a caulking die used for this caulking.

  Thereafter, the end of the rubber hose 3 (not shown in FIGS. 4 (a) and 4 (b)) is inserted into the socket 5, and crimped with a crimping die (not shown) from the outer peripheral side of the socket 5. By applying a tightening force, the coupling is performed by caulking coupling as shown in FIGS. 3 (a) and 3 (b). 3 (a) and 3 (b), 5 'is a crimped socket, and 7 and 7' are crimping recesses formed by the crimping connection of the socket and the hose.

  In the conventional assembling method as described above, in order to connect the pipe joint 2, the inner tube 4, the socket 5, and the rubber hose 3, a total of three times of crimping, or two times of crimping and one press In any case, three immobilization treatments were necessary.

  In this conventional assembling method, there is a process-related negative point that a total of three times of fixing processes are necessary. After fixing the socket 5, the inner tube 4 is fixed by crimping at a portion protruding from the socket 5. Since it is a method of fixing, as shown in FIG. 4A, a length for caulking the joint of A and the inner tube 4 is essential, and when the insert nipple 8 is particularly used. The length B for fixing the part is also required.

  After all, at least the length of A, and in some cases, the length of B necessary for fixing the metal insert nipple 8 are further required as a portion protruding from the socket 5, and the pulsation absorbing hose 1 is bent from the base. When it is desired to do so, there is an inconvenience that these parts are scratched on the inner surface of the rubber hose 3 due to the bending, and this has the inconvenience of affecting / restricting the design of the piping position in a narrow vehicle interior space.

  In other words, in order to allow the design of the piping position in a narrow vehicle body more freely, the socket is shorter and more compact, and the pulsation absorbing hose coming out from the end of the socket can be bent more freely. Therefore, a pulsation absorbing hose that is possible without adversely affecting the pulsation absorbing performance and the overall life is desired.

With respect to such a point, in the pulsation absorption hose shown in Patent Documents 1-4, the actual situation is that sufficient studies have not yet been made.
Japanese Utility Model Publication No. 58-7991 JP-A-7-269775 JP 2004-11888 A JP 2000-146076 A

  In view of the above-mentioned points, the present invention further simplifies the assembly process of the pulsation absorbing hose itself, has a stable quality and reduced cost, and further adversely affects the pulsation absorbing performance and the overall life. It is an object of the present invention to provide a pulsation absorbing hose structure and a method for assembling the pulsation absorbing hose that can more freely design a piping position in a narrow vehicle body and the like.

The pulsation absorbing hose of the present invention that achieves the above-described object has the following configuration (1).
(1) having a rubber hose fastened and fixed to the end of the pipe joint by a caulking force applied through a socket fixed to the end of the pipe joint, and a resin tube silencer extending into the rubber hose The pulsation absorbing hose is characterized in that the socket and the resin tube silencer are both fixed to the end of the pipe joint by a socket caulking force when the socket is fastened and fixed to the end of the pipe joint. Construction.

In the pulsation absorbing hose structure of the present invention, more preferably, it comprises the following configurations (2) to (5).
(2) The pulsation absorbing hose structure according to claim 1, wherein the pulsation absorbing hose is a power steering hose.
(3) The above-mentioned (1) or (2), wherein an insert nipple is attached to the tube tip of the resin tube silencer, and the insert nipple is caulked and fixed to the end of the pipe joint. Pulsation absorption hose structure.
(4) The pulsation absorbing hose as described in (1) or (2) above, wherein no other member is provided at the caulking fixing part of the resin tube silencer, and the caulking is fixed at the end of the pipe joint Construction.
(5) The metal inner ring that receives the resin tube silencer is formed in a caulking and fixing portion of the resin tube silencer on the pipe inner surface of the pipe joint, according to the above (1) or (2) Pulsation absorption hose structure.

Further, the method for assembling the pulsation absorbing hose of the present invention that achieves the above-mentioned object has the following configuration (6).
(6) A hose crimping socket is fastened and fixed together with a resin tube silencer to the end of the pipe joint by a caulking method. Further, a rubber hose is attached to the end of the pipe joint, and the hose crimping socket is attached. A method for assembling the pulsation absorbing hose, wherein the rubber hose is fastened and fixed to the pipe joint by crimping via a screw.

In the method for assembling the pulsation absorbing hose of the present invention, more preferably, it comprises the following configuration (7).
(7) The method for assembling the pulsation absorbing hose according to the above (6), wherein the pulsation absorbing hose is a power steering hose.

  According to the pulsation absorption hose structure of the present invention, the assembly process of the pulsation absorption hose itself is further simplified, the quality is stable and the cost is reduced, and further, the pulsation absorption hose and the overall life are not adversely affected. A pulsation absorbing hose structure is provided that allows the design of the piping position in a narrow vehicle body more freely.

  Moreover, according to the assembly method of the pulsation absorption hose of the present invention, a novel pulsation absorption hose assembly method capable of producing the pulsation absorption hose having the pulsation absorption hose structure of the present invention is provided. It is.

  Hereinafter, the pulsation absorption hose structure and the pulsation absorption hose assembly method of the present invention will be described in more detail.

  The pulsation absorbing hose structure of the present invention includes a rubber hose fastened and fixed to an end of a pipe joint by a caulking force applied through a socket fixed to the end of the pipe joint, and a resin extending into the rubber hose. It has a tube silencer, and this configuration is basically the same as the conventional pulsation absorbing hose structure shown in FIG.

  A characteristic feature of the pulsation absorbing hose structure of the present invention is that the resin tube silencer is attached to the pipe joint by a socket caulking force applied when the socket is fastened and fixed to the end of the pipe joint. The fastening is fixed.

  This structure will be explained with reference to FIG. 1. FIG. 1 is a cross-sectional model view of a main part showing a pulsation absorbing hose structure according to the present invention. A characteristic of the pulsation absorbing hose structure of the present invention is that both the socket 5 and the resin tube silencer 12 are fixed together by a fastening force.

  That is, 9 in FIG. 1 is the same caulking die shown in FIG. 4A, but in the present invention, caulking force F1 for fixing the bottom of the socket 5 by the caulking die 9 is used. And the caulking force totaling the caulking force F2 used for fixing the resin tube silencer 12 is simultaneously applied in common by one immobilization process.

  Therefore, since the fixing by the caulking process of the socket 5 and the resin tube silencer 12 with respect to the pipe joint 2 is performed by the simultaneous process, the number of times of the immobilizing process can be reduced by one time, and as shown in FIG. The presence of a portion protruding from the end portion of the socket 5 having the lengths A and B necessary for performing the caulking and fixing process between the pipe joint 2 and the inner tube 4 is no longer necessary. The pulsation absorbing hose 1 can be bent greatly immediately.

  In the pulsation absorbing hose structure of the present invention, the resin tube silencer 12 is the same as the resin made of the above-mentioned inner tube, but from the viewpoint of durability, etc. In particular, when the pulsation absorbing hose is a power steering hose, it is preferable in terms of heat resistance.

  In addition, in the pulsation absorbing hose structure of the present invention, there are various specific modes for coupling the pipe joint 2 and the resin tube silencer 12, and as shown in FIG. An insert nipple 11 is attached to the tip of the tube (tip on the side of the pipe joint), and the insert nipple 11 may be caulked and fixed to the end of the pipe joint 2 or ( As shown in b), other members may not be provided in the caulking fixing portion of the resin tube silencer 12, but may be caulking and fixing to the end of the pipe joint. Alternatively, as shown in FIG. As shown in (c), a metal inner ring 1 that receives the resin tube silencer 12 at a caulking and fixing portion of the resin tube silencer 12 on the pipe inner surface of the pipe joint 2. There have been formed, a resin tube silencer 12 may be configured to be caulked with the metal in the ring 13.

  Among these, Preferably, it is the method of using the insert nipple 11 for the tube front-end | tip part (pipe joint side front-end | tip part) of the resin tube silencer 12 shown to (a) of FIG. 2, and it becomes stable by setting it as this structure. A reliable caulking connection can be realized.

FIG. 1 is a main part cross-sectional model diagram showing a pulsation absorbing hose structure according to the present invention. 2 (a), (b), and (c) show various specific modes that can be employed in coupling the pipe joint 2 and the resin tube silencer 12 in the pulsation absorbing hose structure of the present invention. . FIGS. 3 (a) and 3 (b) are main part half cross-sectional views schematically showing a coupling structure of a conventional pulsation absorbing hose and a pipe joint part. 4 (a) and 4 (b) are cross-sectional views of main parts that schematically illustrate how the conventional pulsation absorbing hose and the pipe joint are coupled.

Explanation of symbols

1: Pulsation absorbing hose 2: Pipe joint 3: Rubber hose 4: Inner tube 5: Socket 6: Clamping recess 7 caused by caulking connection of socket, 7 ': Clamping recess generated by caulking coupling of hose 8: Insert nipple 9: Clamping die 10 used to fix the end of the pipe joint and the bottom of the socket 10: Clamping die 11 used to fix the tip of the end of the pipe joint to the inner resin tube 11: Insert nipple 12: Resin tube silencer (Inner resin tube)
13: Metal inner ring that receives resin tube silencer 12 F1: Clamping force F2 for fixing the bottom of the socket F2: Clamping force F3 used to fix the end of the pipe joint and the inner tube F3: Bottom of the socket Pressing force to immobilize

Claims (7)

  A rubber hose fastened and fixed to the end of the pipe joint by a caulking force applied through a socket fixed to the end of the pipe joint, and a resin tube silencer extending into the rubber hose, The pulsation absorbing hose structure, wherein the socket and the resin tube silencer are both fixed to the end of the pipe joint by a socket caulking force when the socket is fastened and fixed to the end of the pipe joint.   The pulsation absorption hose structure according to claim 1, wherein the pulsation absorption hose is a power steering hose.   The pulsation absorbing hose structure according to claim 1 or 2, wherein an insert nipple is attached to a tube tip portion of the resin tube silencer, and the insert nipple portion is caulked and fixed to an end portion of a pipe joint.   3. The pulsation absorbing hose structure according to claim 1, wherein the pulsation absorbing hose structure is swaged and fixed to the end portion of the pipe joint without providing other members at the swaged and fixed portion of the resin tube silencer.   The pulsation absorbing hose structure according to claim 1 or 2, wherein a metal inner ring that receives the resin tube silencer is formed in a caulking and fixing portion of the resin tube silencer on the pipe inner surface of the pipe joint.   A hose caulking socket is fastened and fixed together with a resin tube silencer to the end of the fitting by a caulking method. Further, a rubber hose is attached to the end of the fitting, and the hose is clamped via the hose caulking socket. A method for assembling a pulsation absorbing hose, comprising fastening and fixing the rubber hose to the pipe joint.   The method for assembling a pulsation absorbing hose according to claim 6, wherein the pulsation absorbing hose is a power steering hose.

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