JP3635790B2 - Manufacturing method of pressure fluid supply hose - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a pressure fluid supply hose that supplies pressure fluid discharged from a pressure fluid supply device such as a pump to a fluid pressure operation device such as a power steering device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a power steering apparatus for automobiles, noise is generated in the power steering apparatus due to pulsation of pressure fluid discharged from a pump. In order to reduce the pulsation of the pressure fluid, a pressure fluid supply hose having a configuration in which a spiral tube formed by spirally winding a belt-like member is disposed in the inner hole of a flexible rubber hose connecting the pump and the power steering apparatus. Is disclosed in JP-A-6-249375. By providing this spiral tube, a pressure wave having a phase different from the pressure wave of the pressure fluid traveling in the rubber hose can be generated, and the pulsation of the pressure fluid is reduced by the interference action of these pressure waves. For this reason, this helical tube is set to such a length as to generate a pressure wave having a phase opposite to the phase of the pulsation of the pressure fluid in order to reduce the pulsation of the pressure fluid due to the interference action. As shown in FIG. 8, at one end of the metal tube 31, a thin part 31a having a smaller outer diameter and a gentle taper part 31b are formed between the thin part 31a and the cylindrical part 31c. It was inserted into the inner hole 33 of the tube 31 and, as shown in FIG. 9, the caulking jig 30 was brought into contact with the tapered portion 31 b and pressed to fix it to the metal tube 31.
[0003]
[Problems to be solved by the invention]
However, as shown in FIG. 9, the caulking jig 30 is moved in the direction of the up and down arrows in the figure and is brought into contact with the taper part 31b and further pressed and fixed. The force acts on the metal tube 31, and the metal tube 31 sometimes escapes to the left in the figure depending on how the metal tube 31 is supported. When the position where the metal tube 31 escapes and caulks the spiral tube 32 is shifted in this way, the distance from the tip of the metal tube 31 to the tip of the spiral tube 32 not shown is changed. Then, the phase of the pressure wave generated by the spiral tube 32 is shifted, and the pulsation reducing action is reduced.
[0004]
Further, since the taper portion 31b is brought into contact with the caulking jig 30, a component force in the right direction in the drawing acts on the caulking jig 30 by the taper portion 31b, and the caulking jig 30 may escape in the right direction in the drawing. there were. As described above, when the metal tube 31 or the caulking jig 30 escapes, the amount of caulking becomes small, and there is a problem that the spiral tube 32 is easily pulled out.
[0005]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. According to the first aspect of the present invention, a taper portion is formed at one end of the metal tube so that the thickness decreases toward the end portion, and the metal tube is formed. The metal tube is formed such that a taper whose inner diameter increases toward the end portion is formed on the inner periphery of the one end of the metal tube using a caulking jig having a width straddling the cylindrical portion and the taper portion. The helical tube is caulked and fixed to the metal tube by pressing the outer periphery of the metal tube.
[0006]
According to a second aspect of the present invention, a multi-stage taper portion having a plurality of different angles of taper is formed at one end of the metal tube so as to become thinner toward the end portion, and the cylindrical portion of the metal tube and the multi-stage Using a caulking jig having a width across the taper portion, the outer periphery of the metal tube is pressed so that a taper whose inner diameter increases toward the end portion is formed on the inner periphery of the one end of the metal tube. Thus, the helical tube is caulked and fixed to the metal tube.
[0007]
(Function)
When the helical tube is fixed to the metal tube by caulking and the outer periphery of the metal tube is pressed using a caulking jig having a width straddling the cylindrical portion and the taper portion of the metal tube, As a result, the cylindrical portion of the metal tube starts to be displaced in the caulking direction. Further, when the cylindrical portion is displaced in the caulking direction by the caulking jig, the taper portion starts to be displaced in the direction opposite to the caulking direction, but this displacement is suppressed by the contact between the caulking jig and the taper portion. Thus, a taper having an inner diameter that increases toward the end of the inner periphery of the metal tube is formed, and the spiral tube is caulked and fixed to the metal tube. At this time, since the caulking jig is in contact with the cylindrical portion of the metal tube, the axial force of the metal tube perpendicular to the caulking direction does not work, so the metal tube does not escape from the caulking jig, The caulking jig does not escape from the metal tube, and the displacement of the caulking position does not occur.
[0008]
For the second aspect, when caulking and fixing the spiral tube to the metal tube, if the outer periphery of the metal tube is pressed using a caulking jig having a width straddling the cylindrical portion and the multi-step taper portion of the metal tube, the caulking treatment is performed. The cylindrical part of the metal tube starts to be displaced in the caulking direction by the tool. Further, when the cylindrical portion is displaced in the caulking direction by the caulking jig, the multi-step taper portion starts to be displaced in the direction opposite to the caulking direction, but this displacement is suppressed by the contact between the caulking jig and the multi-step taper portion. The Thus, a taper having an inner diameter that increases toward the end of the inner periphery of the metal tube is formed, and the spiral tube is caulked and fixed to the metal tube. At this time, since the caulking jig is in contact with the cylindrical portion of the metal tube, the axial force of the metal tube perpendicular to the caulking direction does not work, so the metal tube does not escape from the caulking jig, The caulking jig does not escape from the metal tube, and the displacement of the caulking position does not occur.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 1 denotes a flexible rubber hose that can be expanded and contracted, and both ends thereof are connected fittings 2 connected to a pressure fluid supply device such as a pump (not shown) and a fluid pressure operation device such as a power steering device. And 6 are fixed. One connecting fitting 2 is attached to a metal tube 4 having one end inserted into one end of the rubber hose 1, a socket 5 fixed by caulking to the outer periphery of one end of the rubber hose 1, and a pressure fluid supply device such as a pump (not shown). The other connection fitting 6 is composed of a metal tube 8 having one end inserted into the other end of the rubber hose 1 and a socket fixed by caulking to the outer periphery of the other end of the rubber hose. 9 and a joint 7 screwed into a fluid pressure actuating device such as a power steering device (not shown).
[0010]
As shown in FIG. 2, a tapered portion 4a whose outer diameter decreases toward the distal end is formed at one end of the metal tube 4, that is, at the distal end portion 11, and the cylindrical portion passes through the tapered portion 4a inside. An inner hole 12 having a depth reaching 4b is formed.
A spiral tube 10 formed by spirally winding two strip members 10a and 10b as shown in FIG. 2 is inserted into the inner hole 1a of the rubber hose 1. One end 10c of the spiral tube 10 is inserted into the inner hole 12 of the metal tube 4, and is caulked and fixed to the metal tube 4 by being pressed from the outer periphery of the metal tube 4 by the caulking jig 20, and the other end 10d. Is opened at the inner hole 1a of the rubber hose 1 as shown in FIG. As shown in FIG. 2, the width W of the caulking jig 20 is set to a width straddling the cylindrical portion 4 b and the tapered portion 4 a of the metal tube 4, and the pressing surface 20 a is the cylindrical portion of the metal tube 4. It is parallel to 4b.
[0011]
A method for caulking and fixing the spiral tube 10 to the metal tube 4 in the first embodiment having the above configuration will be described.
First, as shown in FIG. 2, the caulking jig 20 is positioned at a position straddling the cylindrical portion 4 b and the taper portion 4 a of the metal tube 4 (in this embodiment, the width W of the caulking jig 20 is the metal tube 4. Is overhanging from the tip portion 11). Next, the caulking jig 20 is moved in the caulking direction (arrow direction in the figure). At this time, the pressing surface 20a of the caulking jig 20 comes into contact with the cylindrical portion 4b and is displaced in the caulking direction, and a force for spreading in the direction opposite to the caulking direction starts to act on the tapered portion 4a. Further, when the caulking jig 20 is displaced in the caulking direction, the cylindrical portion 4b is further displaced in the caulking direction, and the tapered portion 4a is displaced in the direction opposite to the caulking direction. However, the displacement of the taper portion 4a is suppressed by the pressing surface 20a of the caulking jig 20 coming into contact with the taper portion 4a, and the caulking is completed in the state shown in FIG. By caulking and fixing in this way, the outer periphery of the metal tube 4 becomes a cylindrical shape parallel to the cylindrical portion 4b, and a tapered portion 4c whose inner diameter increases toward the end is formed on the inner periphery. Is done.
[0012]
As described above, when caulking the spiral tube 10 to the metal tube 4, the caulking jig 20 is pressed against the cylindrical portion 4 b on the outer periphery of the metal tube 4, so that the axial direction of the metal tube 4 is perpendicular to the caulking direction. Therefore, the metal tube 4 does not escape in the direction away from the spiral tube 10, and the caulking jig 20 does not escape in the direction away from the metal tube 4. As a result, the distance from the tip 11 or 18 of the metal tube 4 to the spiral tube tip 10d does not change, and the pressure wave of a phase different from the phase of the pressure wave that has traveled through the inner hole 1a of the rubber hose 1 by the spiral tube 10 is achieved. Therefore, the interference of the pressure wave occurs and the pulsation of the pressure fluid can be reduced.
[0013]
Further, since the caulking position does not shift, the amount of caulking does not become small, and the spiral tube 10 does not come off.
Next, a second embodiment of the present invention will be described with reference to FIGS.
Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0014]
The second embodiment is different from the first embodiment in the shape of the distal end portion 19 of the metal tube 4, which is such that the outer diameter decreases toward the distal end as shown in FIG. 4. The second taper part 16 having a steeper angle than the first taper part 15 is formed following the first taper part 15 and the first taper part 15.
Moreover, as shown in FIG. 4, the width W of the caulking jig 20 is set to a width straddling the cylindrical portion 4b of the metal tube 4 and the first and second tapered portions 15 and 16, and the pressing surface 20a is It is parallel to the cylindrical portion 4 b of the metal tube 4.
[0015]
Next, a method for caulking and fixing the spiral tube 10 to the metal tube 4 in the second embodiment will be described.
First, as shown in FIG. 4, the caulking jig 20 is positioned at a position straddling the cylindrical portion 4b of the metal tube 4 and the first and second taper portions 15 and 16 (in this embodiment, the caulking jig 20 Is overhanging from the tip 19 of the metal tube 4). Next, the caulking jig 20 is moved in the caulking direction (arrow direction in the figure). At this time, the pressing surface 20a of the caulking jig 20 abuts on the cylindrical portion 4b and is displaced in the caulking direction, and the first and second taper portions 15 and 16 are forced to spread in a direction opposite to the caulking direction. Begins to work. Further, when the caulking jig 20 is displaced in the caulking direction, the cylindrical portion 4b is further displaced in the caulking direction, and the first and second taper portions 15 and 16 are displaced in the direction opposite to the caulking direction. However, the displacement of the first and second taper portions 15 and 16 is suppressed by the pressing surface 20a of the caulking jig 20 coming into contact with the first and second taper portions 15 and 16, and is caulked in the state shown in FIG. Fixing is complete. By performing caulking and fixing by such a method, the outer periphery of the metal tube 4 becomes a cylindrical shape parallel to the cylindrical portion 4b, and the inner diameter increases toward the end on the inner periphery. Tapered portions 17 and 18 are formed.
[0016]
In the second embodiment, in addition to the same effects as those of the first embodiment, first and second taper portions 17 and 18 having different angles are formed on the inner periphery of the metal tube 4, and the first angle is steep. The two taper portions 18 create a certain level difference between the belt-like members 10a and 10b of the spiral tube 10, so that the spiral tube 10 is prevented from coming off, and the first taper portion 17 having a loose angle has a smooth change in taper angle and the spiral tube. Since there is almost no step between the ten belt-like members 10a and 10b, it acts as a leak prevention of the pressure fluid, so the distance from the tip of the metal tube 4 to the end of the caulking jig 20 that contacts the outer periphery 4b of the metal tube 4 Even when the length of the spiral tube 10 is short, the pulsation reducing action of the spiral tube 10 can be secured while preventing the spiral tube 10 from coming off.
[0017]
In the second embodiment, the case where the tapered portion of the distal end portion 19 of the metal tube 4 has two stages has been described, but a multistage taper may be used.
In the first and second embodiments, as shown in FIGS. 2 and 4, the outer periphery of the tip of the metal tube 4 has a tapered portion 4a or a first portion whose outer diameter decreases toward the end. The second taper portions 15 and 16 are formed, and the caulking jig 20 is brought into contact with and pressed against the cylindrical portion 4b, whereby the inner diameter of the end of the metal tube 4 increases toward the end portion thereof. Although the taper is formed, as in the third embodiment shown in FIG. 6, a tapered portion 21a having an inner diameter that increases toward the end is formed on the inner periphery of the tip 22 of the metal tube 21, and the metal The caulking jig 23 straddles the cylindrical part 21b and the taper part 21a on the inner periphery of the metal tube 21 by using the caulking jig 23 having a width straddling the cylindrical part 21b and the taper part 21a on the inner periphery of the tube 21. The inner cylinder of the metal tube 21 at the position By abutting against and pressing the cylindrical portion 21c on the outer periphery corresponding to 21b, a taper having an inner diameter that increases toward the end is formed on the inner periphery of the distal end portion 22 of the metal tube 21, and the spiral tube 10 is connected to the metal tube. Even if it is caulked and fixed to 21, the same effect can be obtained.
[0018]
Further, as in the fourth embodiment shown in FIG. 7, the first taper portion 25 and the first taper portion 25 have an inner diameter that increases toward the end portion of the inner end 24 of the metal tube 21. Subsequently, a second taper portion 26 having a different angle from the first taper portion 25 may be formed, and the spiral tube 10 may be caulked and fixed to the metal tube 21 in the same manner as in the third embodiment.
[0019]
Moreover, in the said 1st-4th embodiment, although the crimping jig | tool of the width which overhangs ahead of the front-end | tip of a metal tube was used, the width | variety which does not overhang ahead of the front-end | tip of a metal tube A caulking jig may be used.
[0020]
【The invention's effect】
As described above, according to the present invention, a tapered portion or a multi-step tapered portion whose thickness becomes thinner toward one end of the metal tube is formed, and straddles the cylindrical portion and the tapered portion or the multi-step tapered portion of the metal tube. Using a caulking jig with a large width, the outer periphery of the metal tube is pressed so that the inner periphery of the metal tube is tapered toward the end thereof, and the spiral tube is connected to the metal tube. Since the pressure fluid supply hose is manufactured by caulking and fixing, the pressing surface of the caulking jig is in contact with the cylindrical portion of the metal tube in parallel, and the axial force of the metal tube perpendicular to the caulking direction is applied. It does not work, the metal tube does not escape in the direction away from the spiral tube, and the caulking jig does not escape in the direction away from the metal tube. As a result, the distance from the tip of the metal tube to the tip of the spiral tube does not change, and a pressure wave having a phase different from the phase of the pressure wave traveling through the rubber hose can be generated by the spiral tube. Occurs, and the pulsation of the pressure fluid can be reduced. Further, since the caulking position does not shift, the amount of caulking can be made constant, and the spiral tube does not come off.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of a pressure fluid supply hose showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state before caulking of the metal tube and the spiral tube according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a state after caulking of the metal tube and the spiral tube according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a state before caulking of a metal tube and a spiral tube according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a state after caulking of a metal tube and a spiral tube according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a tip shape of a metal tube in a third embodiment of the present invention.
7 is a cross-sectional view showing a tip shape of a metal tube according to a fourth embodiment of the present invention. FIG. 8 is a cross-sectional view showing a state before a conventional metal tube and a spiral tube are caulked.
FIG. 9 is a cross-sectional view showing a state after caulking of a conventional metal tube and a spiral tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible rubber hose 4 Metal tube 4a Tapered part 4b Cylindrical part 4c Inner circumference taper 10 Spiral tube 10a, 10b Strip member 15 1st taper part 16 2nd taper part 17 Inner circumference taper 20 Caulking jig W Width of caulking jig

Claims (2)

One end of a spiral tube formed by spirally winding a band-shaped member on one end of a metal tube is inserted, and the spiral tube is caulked and fixed by caulking jig from the outer periphery of the metal tube. In a manufacturing method of a pressure fluid supply hose that is inserted into a flexible rubber hose and fixes the metal tube to one end of the rubber hose, a tapered portion that becomes thinner toward one end of the metal tube toward the end And a taper whose inner diameter increases toward the end on the inner periphery of the one end of the metal tube is formed using a caulking jig having a width straddling the cylindrical portion and the taper portion of the metal tube. The helical tube is fixed by caulking to the metal tube by pressing the outer periphery of the metal tube as described above. Method. One end of a spiral tube formed by spirally winding a band-shaped member on one end of a metal tube is inserted, and the spiral tube is caulked and fixed by caulking jig from the outer periphery of the metal tube. In a method for manufacturing a pressure fluid supply hose, which is inserted into a flexible rubber hose and the metal tube is fixed to one end of the rubber hose, a plurality of metal tubes are arranged such that the thickness of the metal tube decreases toward one end of the metal tube. Forming a multi-stage taper portion comprising tapers of different angles, and using a caulking jig having a width straddling the cylindrical portion of the metal tube and the multi-stage taper portion, an end portion thereof on an inner periphery of the one end of the metal tube The spiral tube is caulked and fixed to the metal tube by pressing the outer periphery of the metal tube so that a taper whose inner diameter increases toward the Manufacturing method of the pressure fluid supply hose, characterized in that.

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