JP2009257379A - Fastening method of hose joint, and hose joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening method of a hose joint for providing a hose joint excellent in high-pressure sealing properties by stably fastening without inclining a caulking part of a socket toward an axial direction when fastening the socket to a nipple by caulking. <P>SOLUTION: In the fastening method of the hose joint for fastening an opening hole part 5 formed in the caulking part 3 of the socket 2 to fastening parts 1a, 1b of the nipple 1, a circumferential groove 6 of a groove width w which is narrower than a caulking part wall thickness t of the socket 2 is formed in the fastening parts 1a, 1b of the nipple 1 and the caulking part 3 of the socket 2 is fastened by caulking while wrap margins a, b are provided in front of and behind the circumferential groove width w in an axis C direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hose coupling fastening method and a hose coupling for fastening a hole formed in a crimping portion of a socket by crimping to a fastening portion of a nipple, and more specifically, the opening of the socket is connected to a nipple. The present invention relates to a hose coupling caulking method and a hose coupling which prevent a sealing performance from being deteriorated as a result of non-uniform caulking surface pressure generated between the two.

  In hose joints that connect pipes and hoses or between hoses and hoses, especially in hose joints used in medium- and high-pressure hoses such as automotive power steering hydraulic circuits and air conditioner refrigerant circuits, leakage pressure can be improved. Desired. As such a hose joint, a hose joint comprising a nipple and a socket fastened and fastened to the nipple is often used.

  However, since the fastening portion has a seal structure by metal contact (metal touch), a minimal gap is likely to be generated in the metal contact portion due to non-uniform crimping surface pressure during crimping. As a result, when used as a hose joint for medium and high pressure, there is a problem that leakage occurs from the fastening portion.

  In order to solve such a problem, a hose with a pipe joint conventionally proposed will be described below with reference to FIG. FIG. 6 is a sectional view of an essential part showing a specific example of a hose with a pipe joint in which a hose end is connected to a pipe joint according to a conventional example.

  The pipe joint according to this conventional example is provided with a ridge portion 10b so as to make a round in the circumferential groove 10a formed on the outer peripheral surface of the joint main body 10, and a hose end portion is inserted into the joint main body 10 to form a sleeve 20 The annular engagement portion 20a is tightened (see Patent Document 1). In addition, other hose joints in which protrusions are formed in circumferential grooves formed on the outer peripheral surface of the joint body have been proposed (see Patent Documents 2, 3, and 4). Furthermore, in order to prevent the socket from coming off or slipping out of the nipple, it has been proposed that the outer peripheral surface of the projection or the circumferential groove has knurled eyes (see Patent Document 5).

  Therefore, first, the present inventors, based on the above-mentioned Patent Document 1, provided the protruding portion 10a so as to make a round in the circumferential groove 10a formed in the outer peripheral surface of the joint body (hereinafter also referred to as nipple) 10, An experiment was conducted in which a hose end portion was inserted into the joint body 10 and the annular engagement portion 20a fitted into the circumferential groove 10a was caulked, but the sleeve (hereinafter also referred to as a socket) 20 It has been found that the annular engagement portion 20a is tilted back and forth in the axial direction and stable caulking is difficult.

  The reason for this is that there is a portion (a circumferential groove portion other than the ridge portion 10a) having a low surface pressure during caulking before and after the ridge portion 10a in the axial direction, so that the annular engagement portion 20a of the sleeve 20 is added. When tightening, if the position of the caulking claw in the axial center direction is inappropriate, the annular engagement portion 20a falls to the side with a low surface pressure. Therefore, in order to achieve stable caulking, strict management of the axial center relative positions of the protruding portion 10b provided in the circumferential groove 10a, the annular engagement portion 20a of the sleeve 20 and the caulking claw is required. Required.

  Next, an experiment was conducted in which a plurality of protrusions were provided in the circumferential groove 10a formed in the nipple 10 and the annular engagement portion 20a fitted into the circumferential groove 10a was crimped. Also in this case, if the annular engagement portion 20a is formed so as to be fitted in the circumferential groove 10a formed in the nipple 10, if the relative positions of the two in the axial direction vary, the annular engaging portion 20a is inclined and stabilized in the longitudinal direction. It was difficult to perform caulking. On the other hand, if the groove width of the circumferential groove 10a formed in the nipple 10 is slightly larger than the width of the annular engagement portion 20a, relatively stable caulking can be performed within a minute variation range in the axial center relative positions. Met.

  However, in such a conventional hose joint, caulking is performed while managing minute variations in the axial center relative positions of the circumferential groove 10a width formed in the nipple 10 and the annular engagement portion 20a width of the sleeve 20. It needs to be processed and is very troublesome. In addition, since a minute gap is formed between the circumferential groove 10a of the nipple 10 and the annular engagement portion 20a of the sleeve 20, liquid such as hydraulic fluid that is passed through the hose joint remains in this gap. May cause corrosion.

JP-A-10-252967 Japanese Utility Model Publication No. 3-23284 Japanese Patent No. 3601235 No. 1-351111 JP 61-65989 A

  As a result of intensive studies in view of the above situation, the present invention has obtained the knowledge that a hose joint having high sealing performance can be obtained if the reaction force at the time of caulking in the fastening portion is appropriate in the axial direction. It has been done. Accordingly, an object of the present invention is to provide a hose joint fastening method in which a hole formed in a crimping portion of a socket is fastened into a fastening portion of a nipple and fastened. It is an object of the present invention to provide a hose joint fastening method and a hose joint that can stabilize a caulking without inclining and obtain a hose joint excellent in high-pressure sealability.

  According to the first aspect of the present invention, the hose coupling fastening method employs a hose coupling fastening method in which an opening formed in a crimping portion of a socket is fastened into a fastening portion of a nipple and fastened. And forming a circumferential groove having a narrower groove width than the caulking portion wall thickness of the socket at the fastening portion of the nipple, and having the lap margin before and after the circumferential groove width in the axial direction. It is characterized by crimping and fastening.

  The means adopted by the hose coupling fastening method according to claim 2 of the present invention is the hose coupling fastening method according to claim 1, wherein the lapping margin before and after the circumferential groove width is 0.15 mm or more. The socket is swaged and fastened to be fastened.

  The means adopted by the method for crimping a hose joint according to claim 3 of the present invention is the method for crimping a hose joint according to claim 1 or 2, wherein the circumferential groove width formed in the nipple is 1.4 mm or more. It is characterized by that.

  According to a fourth aspect of the present invention, the hose joint employs a hose joint that is fastened by crimping an opening formed in a crimping portion of a socket into a fastening portion of the nipple. A circumferential groove having a narrower groove width than the caulking portion wall thickness of the socket is formed in the socket, and the caulking portion of the socket is caulked with a lapping margin before and after the circumferential groove width in the axial direction. A plastic flow is generated in the caulking portion, and a biting portion that bites into the circumferential groove of the nipple is formed and fastened.

  According to the method for crimping a hose joint according to claim 1 of the present invention, in the method for fastening a hose joint, the hole portion formed in the crimping portion of the socket is crimped into the fastening portion of the nipple and fastened. A circumferential groove having a narrower groove width than the caulking portion wall thickness of the socket is formed at the fastening portion of the nipple, and the caulking portion of the socket is added with a lap margin before and after the circumferential groove width in the axial direction. Since tightening and fastening are performed, a reaction force against the surface pressure at the time of caulking is uniformly formed at the fastening portion of the nipple before and after the circumferential groove width, and the axial center relative position of the caulking portion of the socket with respect to the fastening portion of the nipple is Even if there is some variation, stable crimping is possible without tilting the crimping portion of the socket.

  Further, according to the method for fastening a hose joint according to claim 2 of the present invention, the fastening portion of the socket is fastened and fastened in a state where the lapping margin before and after the circumferential groove width is 0.15 mm or more. As a result of the reaction force against the caulking pressure being surely generated in the opening portion of the socket from the front and back of the circumferential groove width of the abutting portion of the nipple that comes into contact, stable caulking can be performed.

  Furthermore, according to the method for crimping a hose joint according to claim 3 of the present invention, since the circumferential groove formed in the nipple has a width of 1.4 mm or more, the circumferential groove is spaced apart by the circumferential groove. Each lap is formed. As a result, when the caulking portion of the socket is caulked on the circumferential groove, a reaction force spaced 1.4 mm or more from the front and back of the circumferential groove width of the nipple to contact is uniformly generated in the opening portion of the socket. Furthermore, stable caulking can be performed.

  On the other hand, according to the hose coupling according to claim 4 of the present invention, in the hose joint fastened by fastening the opening formed in the crimping portion of the socket into the fastening portion of the nipple, the fastening of the nipple A circumferential groove having a narrower groove width than the caulking portion wall thickness of the socket is formed in the socket, and the caulking portion of the socket is caulked with a lapping margin before and after the circumferential groove width in the axial direction. A plastic flow is generated in the caulking portion, and a biting portion that bites into the circumferential groove of the nipple is formed and fastened.

  As a result, even if the relative position of the swaged portion of the socket in the axial direction of the swaged portion of the socket is somewhat varied and swaged, the biting portion is formed, so that the hose joint with excellent sealing performance is formed. Can provide.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a state before caulking for explaining a method for fastening a hose joint according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a state immediately after the caulking starts in the hose joint of FIG. FIG. 3 is a partial cross-sectional view, and FIG. 3 is an outline view partially showing a state in which the hose joint of FIG.

  The hose joint according to the present invention includes a nipple 1 for inserting and connecting a hose tip, and a bottomed cylindrical socket 2 including a cylindrical portion 4 and a bottom portion (hereinafter also referred to as a crimping portion) 3. ing. An opening 5 is formed in the caulking portion 3 of the socket 2 concentrically with the cylindrical portion 4. And the fastening method of the hose coupling which concerns on Embodiment 1 of this invention fastens by fastening the opening part 5 formed in the crimping part 3 of the said socket 2 in the fastening parts 1a and 1b of the nipple 1. The present invention relates to a method for fastening a hose joint.

  The nipple 1 and the socket 2 are made of a lightweight and non-rusting material such as an aluminum alloy for use in a power steering hydraulic circuit for automobiles or a refrigerant circuit for a vehicle air conditioner. For example, copper, brass, iron, or the like can be used.

  First, on the tip side of the nipple 1 is formed a bamboo scalloped concave / convex groove 1a and the like to prevent the hose from being pulled out, and on the outer periphery of the fastening portions 1a and 1b of the nipple 1 is a socket. A circumferential groove 6 having a groove width w narrower than the wall thickness t of the two crimping portions 3 is formed.

  Next, the nipple 1 is inserted into the opening portion 5 formed in the crimping portion 3 of the socket 2, and the opening portion 5 is specified as the fastening portions 1a and 1b of the nipple 1, that is, as follows. Arranged in the vicinity of the circumferential groove 6. Thereafter, a caulking pressure is applied to the outer peripheral surface 3c of the caulking portion of the socket 2 in a centripetal direction by a caulking machine (not shown) having caulking claws divided into eight, and the nipple 1 and the socket 2 Is concluded.

  At that time, the fastening portions 1a, 1b of the nipple 1 have a lap margin a, b (a, b> 0 mm) around the axial center C direction of the circumferential groove width w formed in the nipple 1, It is essential that the fastening portions 1a and 1b are swaged while bringing the opening portion 5 formed in the swaged portion 3 of the socket 2 into contact therewith. Here, as shown in FIG. 2, the wrap allowance is applied with a caulking pressure on the caulking portion outer peripheral surface 3c of the socket 2, and the opening portion 5 and the fastening portions 1a and 1b of the nipple 1 are brought into contact with each other. In this case, the front and rear portions a and b in the axial center C direction of the circumferential groove 6 where the opening portions 5 of the socket 2 and the fastening portions 1a and 1b of the nipple 1 overlap each other are referred to.

  That is, “lapping allowance a> 0 mm” means that in FIG. 2, the position of the outer surface 3 a of the bottom portion of the socket 2 is in the direction of the axis C from the position of the rear inner wall surface 6 a of the circumferential groove 6 formed in the nipple 1. "Wrap allowance b> 0 mm" means that the position of the bottom inner surface 3b of the socket 2 is on the right side in the direction of the axis C from the position of the front inner wall surface 6b of the circumferential groove 6. Means that

  That is, the bottom outer surface 3a of the socket 2 and the rear inner wall surface 6a of the circumferential groove 6 or the bottom inner surface 3b of the socket 2 and the front inner wall surface 6b of the circumferential groove 6 have a gap in the axial center C direction. As a relative position state that is not formed, it is important that the outer peripheral surface 3c of the crimping portion of the socket 2 is crimped and fastened.

  In this way, the circumferential groove 6 having a groove width w narrower than the caulking portion thickness t of the socket 2 is formed on the outer periphery of the fastening portions 1a and 1b of the nipple 1, and before and after the circumferential groove width w in the axis C direction. Fastening the nipple 1 to be brought into contact with the opening 5 of the socket 2 during the caulking process by tightening and tightening the caulking portion 3 of the socket with the lapping margins a and b Since the reaction force against the caulking pressure from the portions 1a and 1b is evenly generated in the front and rear two locations in the axial center C direction, the caulking portion 3 of the socket 1 does not fall forward and backward in the axial center C direction and the sealing performance is not impaired. .

Further, the crimping portions 1a and 1b of the nipple 1 are fastened by tightening the crimping portions of the socket in a state where both lap margins a and b before and after the circumferential groove width w are 0.15 mm or more. Is preferred. If the lap allowances a and b are 0.15 mm or more,
This is because, in the opening portion 5 of the socket 2, reaction force against the crimping pressure is surely generated in the front and rear two locations in the axial center C direction from the fastening portions 1 a and 1 b of the nipple 1 that abuts.

  On the other hand, the circumferential groove width w formed in the nipple 1 is preferably 1.4 mm or more. If the circumferential groove width w is less than 1.4 mm, the wrap margins a and b formed by the circumferential groove 6 around the circumferential groove width w in the axial center C direction are too close to each other. When the portion 3 is crimped to the fastening portions 1a and 1b of the nipple 1, the reaction force generated in the fastening portions 1a and 1b is not easily uniform before and after the circumferential groove width w, and the crimping portion 3 of the socket 2 is It leans toward the smaller power.

  On the other hand, in the hose joint fastened in this manner, a circumferential groove 6 having a groove width w narrower than the caulking portion thickness t of the socket 2 is formed in the fastening portions 1a and 1b of the nipple 1, and the axial center C Since the caulking portion 3 of the socket 2 is caulked with the lap margins a and b around the circumferential groove width w in the direction, plastic flow is generated in the opening 5 of the caulking portion 3 of the socket.

  As a result, as shown in FIG. 3, the plastically flowed base material bites into the circumferential groove 6 of the nipple 1 to form a biting portion (joined portion) 5a and fastened. By the biting part (joining part) 5a formed in a convex shape in the centripetal direction of the nipple 1, it is possible to provide a hose joint that is strong and has excellent sealing performance.

  As shown in FIG. 3, this hose joint is used by being integrated with the hose 7 after the hose 7 is inserted into the tip of the nipple 1 and then the crimping portion 4 a of the socket 2 is crimped. The hose 7 is, for example, a hose used for a power steering operation circuit of an automobile, a refrigerant circuit of a vehicle air conditioner, or a general hose used for a water supply pipe.

  As the hose 7 according to the former, an inner tube made of a rubber layer single layer, a resin layer single layer or a resin layer provided with a rubber layer on the outer periphery, a reinforcing layer or a rubber layer provided on the outer periphery of the inner tube, A high pressure hose. As the hose 7 according to the latter, a rubber layer single layer, a resin layer single layer or a plurality of these layers, or a medium pressure hose provided with a reinforcing layer on the inner layer or outer periphery thereof is often used.

  The hose joint integrated with the high-pressure hose like the former can be used without leakage even for a high-pressure hydraulic fluid pressure exceeding 15 MPa, for example, and is effective as a hydraulic fluid circuit application for power steering of automobiles. .

(~ [0041]: additional)
Next, a hose coupling fastening method and a hose coupling according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of an essential part showing a state immediately after the start of caulking in the hose coupling fastening method according to Embodiment 2 of the present invention.

  However, the second embodiment of the present invention differs from the first embodiment in the configuration of the fastening portion formed on the nipple. Except for these differences, the second embodiment has the same configuration as the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described below.

  That is, in the first embodiment, the fastening portions 1a and 1b of the nipple 1 are the outer peripheral surfaces of the nipple 1, and the fastening portions 1a and 1b of the outer peripheral surface are narrower than the caulking portion thickness t of the socket 2. The circumferential groove 6 having the groove width w is formed, and the caulking portion 3 of the socket 2 is crimped and fastened with the wrap margins a and b before and after the circumferential groove width w in the axis C direction. It had been.

  On the other hand, in the hose coupling fastening method according to the second embodiment of the present invention, the outer peripheral groove 10 having a groove width L wider than the caulking portion wall thickness t of the socket 1 is first formed on the outer periphery of the nipple 1. The bottom surface of the outer circumferential groove 10 is used as the nipple fastening portions 1a and 1b. Further, a circumferential groove 6 having a groove width w narrower than the caulking portion thickness t of the socket is formed on the outer periphery of the fastening portions 1a and 1b, and the lap allowances a and f are arranged around the circumferential groove width w in the axis C direction. In the state having b, the caulking portion 3 of the socket is caulked and fastened.

Therefore, the hose joint according to the second embodiment of the present invention is similar to the first embodiment in that the caulking portion of the socket 2 has the wrap margins a and b around the circumferential groove width w in the direction of the axis C. 3 is caulked to cause plastic flow in the caulking portion 3 of the socket 2, and a biting portion 5a that bites into the circumferential groove 6 of the nipple 1 is formed and fastened. as a result,
Even if the relative position of the crimping portion 3 of the socket 2 in the axial center C direction with respect to the fastening portions 1a and 1b of the nipple 1 is somewhat varied and crimped, a hose joint with excellent sealing performance can be provided.

  Next, in FIGS. 1 and 2, the circumferential groove width w of the nipple 1 is 1.1 to 3.1 mm, and the relative position shift in the axial center C direction with respect to the circumferential groove 6 of the crimping portion 3 of the socket 2 (hereinafter simply referred to as “simply”). Hose joints (refer to Table 1) according to various embodiments 1 in which S was changed in the range of −1.0 to +1.0 (referred to as Table 1), and leakage tests of these hose joints were performed. Examples will be described below with reference to FIG. 5 and Table 1. Here, the relative displacement S in FIG. 2 indicates a positive value. The depth d of the circumferential groove 6 formed in the nipple 1 was 0.6 mm (constant).

  First, using a hose joint member having the following configuration, N = 3 pieces of the hose joint for a leak test shown in FIG. In this leak test, in particular, in order to confirm the presence or absence of leakage from the joint portion (biting portion) 5a between the nipple 1 and the socket 2, a through hole 9 is provided in the nipple 1, and the bottom inner surface 3b of the socket 2 and the hose A space of 10 mm was provided between the end faces, the power steering hose 7a was inserted into the nipple 1, and the crimping portion 4a was crimped to connect the hose joint and the hose 7a. Further, the rear end side of the nipple 1 was closed by screwing the plug 8.

<Hose joint member>
-Nipple: Iron (S12C), outer diameter 10.0 mm, inner diameter 6.5 mm
-Socket: Iron (S12C), outer diameter 26.0 mm, inner diameter 22 mm,
Caulking thickness t = 4.1mm
・ Hose: Power steering hose, outer diameter 20mm, inner diameter 10mm

  Assuming a hydraulic fluid circuit for power steering to the hose 7a connected to the hose joint in this way, a water pressure of 15 MPa, which is the specified pressure, was applied, and a leak test was conducted for the hose joint of each condition N = 3. . The test results are shown in Table 1.

  In the case of the comparative example-1 having the circumferential groove width w = 1.1 mm, the lap margins a and b are 2.1 mm or 0.9 mm when the relative positional deviation S = −0.6 mm and +0.6 mm. Regardless, at the time of caulking, the caulking portion 3 of the socket 2 was tilted back and forth in the direction of the axis C, and as a result, water leakage occurred in the water leak test. On the other hand, in Example-1 with the circumferential groove width w = 1.6 mm, the caulking portion 3 of the socket 2 did not tilt and no water leak occurred under all conditions.

  This is because, when the circumferential groove width w is less than 1.4 mm, when the crimping portion 3 of the socket 2 is crimped to the fastening portions 1 a and 1 b of the nipple 1, the wrap margins a and b are formed by the circumferential groove 6. This is presumed to be because the effect of separating them around the circumferential groove width w in the direction of the axis C is reduced, the crimping pressure becomes uneven, and the crimping portion 3 of the socket 2 is inclined.

  In Examples-2 to 4 in which the circumferential groove width w is 2.1 to 3.1 mm, regardless of the relative displacement S, the caulking portion 3 of the socket 2 does not tilt under all conditions, and water leakage occurs. There wasn't.

  That is, if the caulking portion 3 of the socket 2 is swaged and fastened with the wrap margins a and b before and after the circumferential groove width w in the axis C direction (a and b> 0 mm), the circumferential groove width The reaction force against the surface pressure at the time of crimping is uniformly formed in the fastening portions 1a, 1b of the nipple 1 before and after w, and the axial center C direction relative to the fastening portion 3 of the socket 2 with respect to the fastening portions 1a, 1b of the nipple 1 Even if the position varies somewhat, the caulking portion 5a is formed without the caulking portion 3 of the socket 1 being inclined, which indicates that stable caulking can be performed.

  On the other hand, in Comparative Examples-2 and 3, either one of the wrap margins a and b is a negative value, that is, the rear inner wall surface 6a or front inner wall surface 6b of the circumferential groove 6 of the nipple 1 and the opening portion 5 of the socket 2. , The caulking pressure became uneven and the caulking portion 3 of the socket 2 was inclined, causing water leakage. When it divided | segmented into the axial center C direction after a water leak test, it was confirmed that formation of the biting part 5a is inadequate.

  As described above, according to the method for fastening a hose joint according to the present invention, a circumferential groove having a narrower groove width than the caulking portion thickness of the socket is formed in the fastening portion of the nipple, and the circumferential groove width before and after the axial direction. In the state having the lapping allowance, the crimping portion of the socket is fastened and fastened, so that the reaction force against the surface pressure at the time of crimping is uniformly formed at the fastening portion of the nipple before and after the circumferential groove width, Even if the relative position in the axial direction of the swaged portion of the socket with respect to the nipple fastening portion varies somewhat, the swaged portion of the socket does not tilt, and stable swaging can be performed.

  Further, according to the hose coupling according to the present invention, a circumferential groove having a narrower groove width than the caulking portion wall thickness of the socket is formed in the fastening portion of the nipple, and a wrap margin is provided around the circumferential groove width in the axial direction. Since the caulking portion of the socket is caulked to cause plastic flow in the caulking portion of the socket, and a biting portion that bites into the circumferential groove of the nipple is formed and fastened, the sealing performance is excellent. A hose coupling may be provided.

It is sectional drawing which shows the state before crimping in order to demonstrate the fastening method of the hose coupling which concerns on embodiment of this invention. It is principal part sectional drawing which shows the state immediately after the start of caulking in the hose coupling of FIG. FIG. 2 is an outline view partially in cross section showing a state where a hose is connected after the hose joint of FIG. 1 is swaged and fastened. It is principal part sectional drawing which shows the state immediately after the start of crimping in the fastening method of the hose coupling which concerns on Embodiment 2 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view shown in part in a cross section in order to demonstrate the hose coupling experimentally manufactured concerning the Example of this invention and for a leak test. It is principal part sectional drawing which shows one specific example of the hose with a pipe joint which connected the hose edge part to the pipe joint which concerns on a prior art example.

Explanation of symbols

a, b: lap cost, C: shaft center (of hose joint),
d: (circumferential) groove depth, S: relative displacement,
t: Thickness of the crimped portion of the socket, w: (circumferential) groove width, L: outer peripheral groove width,
1: nipple, 1a, 1b: fastening part, 1c: uneven groove,
2: Socket, 3: Clamping part (bottom part),
3a: outer surface of the bottom part, 3b: inner surface of the bottom part, 3c: outer peripheral surface of the caulking part,
4: cylindrical part, 4a: caulking part,
5: Opening part, 5a: Biting part (joining part),
6: Circumferential groove, 6a: Rear inner wall surface, 6b: Front inner wall surface,
7: Hose, 7a: Power steering hose,
8: Plug, 9: Through hole, 10: Outer groove

Claims (4)

  In a method for fastening a hose joint in which an opening formed in a crimping portion of a socket is fastened to a fastening portion of a nipple and tightened, a groove width narrower than a thickness of the crimping portion of the socket in the fastening portion of the nipple The hose joint fastening method is characterized in that the circumferential groove is formed and the crimping portion of the socket is fastened and fastened with a lap margin before and after the circumferential groove width in the axial direction.   The method for fastening a hose joint according to claim 1, wherein the fastening portion of the socket is fastened and fastened in a state where a lapping margin before and after the circumferential groove width is 0.15 mm or more.   The method for fastening a hose joint according to claim 1 or 2, wherein a circumferential groove formed in the nipple has a width of 1.4 mm or more.   In a hose joint that is fastened by tightening an opening formed in a crimping portion of a socket into a fastening portion of a nipple, the periphery of the groove width narrower than the thickness of the crimping portion of the socket is formed in the fastening portion of the nipple. A groove is formed, and the caulking portion of the socket is caulked with a lap margin before and after the circumferential groove width in the axial direction, and plastic flow is generated in the caulking portion of the socket, and the circumferential groove of the nipple is A hose coupling formed by forming a bite-in part and fastening it.

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