JPH09317970A - Manufacture of pressurized fluid supply hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacture of a pressurized fluid supply hose in which pressurized fluid delivered from a pressure fluid supply device such as a pump is supplied to a hydraulic actuation device such as a power steering device. SOLUTION: A taper 4a whose thickness is thinned according as it is directed to the end part of a metal tube 4, is formed at the end 11 of the metal tube 4, the periphery of the metal tube 4 is pushed and pressed by the use of a caulking jig 20 having width W extended over the cylindrical part 4b of the metal tube 4 and the taper 4a so that a taper whose inside diameter is increased according as it is directed to the end of the metal tube 4 is formed on the inner circumference of the end 11 of the metal tube 4, and a spiral pipe 10 is caulked and fixed in the metal tube 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pressure fluid supply hose for supplying a pressure fluid discharged from a pressure fluid supply apparatus such as a pump to a fluid pressure operating apparatus such as a power steering apparatus.

[0002]

2. Description of the Related Art Conventionally, in a power steering apparatus for an automobile, abnormal 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-shaped member is arranged in the inner hole of a flexible rubber hose connecting the pump and the power steering device. 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 propagating in the rubber hose can be generated, and the pulsation of the pressure fluid is reduced by the interference action of these pressure waves.
Therefore, this spiral tube is set to a length such that a pressure wave having a phase opposite to the phase of the pulsation of the pressure fluid can be generated in order to reduce the pulsation of the pressure fluid by the interference action. As shown in FIG. 8, one end of the metal tube 31 has a thin portion 31a smaller than its outer diameter, and the thin portion 31a and the cylindrical portion 31c.
A gentle taper portion 31b is formed between the spiral tube 32 and the spiral tube 32, which is inserted into the inner hole 33 of the metal tube 31,
As shown in FIG. 9, the caulking jig 30 is brought into contact with and pressed against the tapered portion 31b to caulk and fix the metal tube 31.

[0003]

However, as shown in FIG. 9, since the caulking jig 30 is moved in the direction of the up and down arrow in the figure and abutted against the taper portion 31b and further pressed, the caulking jig 30 is fixed. The component force in the left direction in the drawing acts on the metal tube 31 by the portion 31b, and the metal tube 31 may escape to the left direction in the drawing depending on how the metal tube 31 is supported. When the position where the metal tube 31 escapes and the caulking spiral tube 32 is displaced in this way, the distance from the tip of the metal tube 31 to the not-illustrated tip of the spiral tube 32 changes. Then, the phase of the pressure wave generated by the spiral tube 32 is shifted, and the pulsation reducing action is reduced.

Further, the caulking jig 30 is used to form a taper portion 31b.
Since the taper portion 31b abuts, the component force in the right direction in the drawing acts on the caulking jig 30 due to the tapered portion 31b, and the caulking jig 30 may escape in the right direction in the drawing. As described above, when the metal tube 31 or the caulking jig 30 escapes, the caulking amount becomes small, and the spiral tube 32 easily comes off.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in the first aspect of the present invention, one end of the metal tube becomes thinner toward the end thereof. A taper that forms a tapered portion and uses a caulking jig having a width that spans the cylindrical portion and the tapered portion of the metal tube, has an inner diameter that increases toward the end of the 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 circumference of the metal tube so that

According to the second aspect of the present invention, the metal tube has a multi-step taper portion formed at a first end thereof, the multi-step taper portion having a plurality of tapers having different angles such that the wall thickness becomes thinner toward the end portion thereof. And an outer circumference of the metal tube so that a taper whose inner diameter increases toward the end is formed on the inner circumference of the one end of the metal tube by using a caulking jig having a width that straddles the multi-step taper part. The spiral tube is caulked and fixed to the metal tube by pressing.

(Operation) When the spiral tube is caulked and fixed to the metal tube, the outer circumference of the metal tube is fixed by using a caulking jig having a width extending over the cylindrical portion and the taper portion of the metal tube. When pressed, the caulking jig begins to displace the cylindrical portion of the metal tube in the caulking direction. Further, when the caulking jig displaces the cylindrical portion in the caulking direction, the taper portion begins to displace in a direction opposite to the caulking direction, but this displacement is suppressed by the contact between the caulking jig and the taper portion. As a result, a taper is formed on the inner circumference of the metal tube, the inner diameter of which increases toward the end, 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 force in the axial direction of the metal tube perpendicular to the caulking direction does not work, so the metal tube does not escape to the caulking jig, The caulking jig does not escape from the metal tube, and the caulking position does not shift.

According to the second aspect of the present invention, when the spiral tube is caulked and fixed to the metal tube, the caulking jig having a width extending over the cylindrical portion and the multi-step taper portion of the metal tube is used to press the outer periphery of the metal tube. The caulking jig causes the cylindrical part of the metal tube to begin to displace in the caulking direction. Furthermore, when the cylindrical part is displaced in the caulking direction by the caulking jig, the multistage taper part begins to displace in the direction opposite to the caulking direction, but this displacement is suppressed by the contact between the caulking jig and the multistage taper part. It As a result, a taper is formed on the inner circumference of the metal tube, the inner diameter of which increases toward the end, 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 force in the axial direction of the metal tube perpendicular to the caulking direction does not work, so the metal tube does not escape to the caulking jig, The caulking jig does not escape from the metal tube, and the caulking position does not shift.

[0009]

FIG. 1 shows a first embodiment of the present invention.
~ It demonstrates based on FIG. In FIG. 1, reference numeral 1 is a flexible rubber hose capable of expanding and contracting, and both ends thereof are connection fittings 2 which are connected to a pressure fluid supply device such as a pump and a fluid pressure operating device such as a power steering device which are not shown. And 6 are fixed. One of the connecting fittings 2 is a metal tube 4 which is inserted into one end of the rubber hose 1 at one end thereof, and a socket 5 which is caulked and fixed to the outer periphery of one end of the rubber hose 1.
And a joint 3 screwed into a pressure fluid supply device such as a pump (not shown), and the other connecting fitting 6 has a metal tube 8 whose one end is inserted into the other end of the rubber hose 1. It is composed of a socket 9 which is caulked and fixed to the outer periphery of the other end of the rubber hose, and a joint 7 which is screwed to a fluid pressure operating device such as a power steering device (not shown).

As shown in FIG. 2, one end of the metal tube 4, that is, the tip end portion 11, is formed with a taper portion 4a whose outer diameter becomes smaller toward the tip end, and passes through the taper portion 4a inside. An inner hole 12 having a depth reaching the cylindrical portion 4b is formed. Inner hole 1a of the rubber hose 1
A spiral tube 10 formed by spirally winding two strip-shaped members 10a and 10b as shown in FIG. One end 10c of the spiral tube 10 is inserted into the inner hole 12 of the metal tube 4, and is pressed by the caulking jig 20 from the outer periphery of the metal tube 4 so that the metal tube 4
The other end 10d is opened by an 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 across the cylindrical portion 4b and the tapered portion 4a of the metal tube 4, and the pressing surface 20a is the cylindrical portion of the metal tube 4. Four
It is parallel to b.

A method of caulking and fixing the spiral tube 10 to the metal tube 4 in the first embodiment having the above structure will be described. First, as shown in FIG. 2, the caulking jig 20 is provided with a cylindrical portion 4b and a tapered portion 4a of the metal tube 4.
(The width W of the caulking jig 20 is overhanging from the tip portion 11 of the metal tube 4 in this embodiment). Next, the caulking jig 20 is moved in the caulking direction (the arrow direction in the drawing). 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 to spread the taper portion 4a in the direction opposite to the caulking direction starts to act. 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 taper 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 fixing is completed in the state shown in FIG. By caulking and fixing by such a method, the outer circumference of the metal tube 4 becomes a cylindrical shape parallel to the cylindrical portion 4b, and the inner circumference thereof has a tapered portion 4c whose inner diameter increases toward the end. To be done.

As described above, the spiral tube 1 is attached to the metal tube 4.
When crimping 0, the crimping jig 20 contacts the cylindrical portion 4b on the outer periphery of the metal tube 4 and presses it, so that the force in the axial direction of the metal tube 4 perpendicular to the crimping direction does not work and moves away from the spiral tube 10. The metal tube 4 does not escape in the direction, 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 portion 11 or 18 of the metal tube 4 to the spiral tube tip 10d does not change, and the pressure wave having a phase different from the phase of the pressure wave traveling through the inner hole 1a of the rubber hose 1 by the spiral tube 10 is generated. Can be generated, so that the interference of pressure waves occurs and the pulsation of the pressure fluid can be reduced.

Further, since the caulking position does not shift, the caulking amount 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. The first embodiment in the second embodiment
The same configurations as those of the embodiment are given the same reference numerals and the description thereof will be omitted.

The second embodiment differs from the first embodiment in the shape of the tip portion 19 of the metal tube 4,
As shown in FIG. 4, the first taper portion 15 has an outer diameter that becomes smaller toward the tip, and the second taper portion 1 having a steeper angle than the first taper portion 15 follows the first taper portion 15.
6 is formed. Further, as shown in FIG. 4, the width W of the caulking jig 20 is determined by the cylindrical portion 4 of the metal tube 4.
b and the width across the first and second tapered portions 15 and 16, and the pressing surface 20a is the cylindrical portion 4 of the metal tube 4.
It is parallel to b.

Next, a method of 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 so as to straddle the cylindrical portion 4b of the metal tube 4 and the first and second tapered portions 15 and 16 (in the present embodiment, the caulking jig 20). The width W of the metal tube 4 is overhanging from the tip 19 of the metal tube 4). Next, the caulking jig 20 is moved in the caulking direction (the arrow direction in the drawing). At this time, the pressing surface 20a of the caulking jig 20 contacts the cylindrical portion 4b and is displaced in the caulking direction, so that the first and second taper portions 1
The force to spread in the direction opposite to the caulking direction starts to act on the parts 5 and 16. 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 first and second tapered 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,
The caulking fixing is completed in the state shown in. By crimping and fixing by such a method, the outer circumference of the metal tube 4 becomes a cylindrical shape parallel to the cylindrical portion 4b, and the inner circumference has a first and second inner diameter that increases toward the end. Tapered portions 17 and 18 are formed.

In the second embodiment, in addition to the same effect as in the first embodiment, first and second taper portions 17 and 18 having different angles are formed on the inner circumference of the metal tube 4 so that the angle is The steep second taper portion 18 is formed by the strip-shaped members 10a, 1 of the spiral tube 10.
0b acts to prevent the spiral tube 10 from coming off, and the first taper portion 17 having a gentle angle has a smooth taper angle change and the strip-shaped member 10a of the spiral tube 10.
Since a step is hardly formed between 10b, it acts as a leakage prevention of the pressure fluid. Therefore, even if the distance from the tip of the metal tube 4 to the end of the caulking jig 20 that abuts the outer circumference 4b of the metal tube 4 is short, The pulsation reducing action of the spiral tube 10 can be secured while preventing the tube 10 from coming off.

In the second embodiment, the case where the tip end portion 19 of the metal tube 4 has two taper portions has been described, but a taper having a plurality of steps may be used. In addition, in the first and second embodiments, as shown in FIGS. 2 and 4, the outer circumference of the tip of the metal tube 4 has a taper portion 4a or a first taper portion whose outer diameter decreases toward the end. , The second tapered 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 metal tube 4
Although the inner circumference of the tip of the metal tube 21 is tapered so that the inner diameter thereof increases toward the end, the end of the metal tube 21 is formed on the inner circumference of the tip 22 as in the third embodiment shown in FIG. Forming a tapered portion 21a whose inner diameter increases toward the portion,
Using the caulking jig 23 having a width that straddles the cylindrical portion 21b and the tapered portion 21a on the inner circumference of the metal tube 21, the crimping jig 23 is straddled over the cylindrical portion 21b and the tapered portion 21a on the inner circumference of the metal tube 21. At a certain position, the distal end portion 22 of the metal tube 21 is abutted and pressed against the outer peripheral cylindrical portion 21c corresponding to the inner peripheral cylindrical portion 21b.
The same effect can be obtained by forming a taper on the inner circumference of which has an inner diameter increasing toward its end and caulking and fixing the spiral tube 10 to the metal tube 21.

Further, as in the fourth embodiment shown in FIG. 7, the inner circumference of the tip 24 of the metal tube 21 has a first taper portion 25 and a first taper portion 25 whose inner diameter increases toward the end thereof.
A second taper portion 26 having an angle different from that of the first taper portion 25 is formed subsequent to the taper portion 25, and the spiral tube 10 is caulked and fixed to the metal tube 21 in the same manner as in the third embodiment. Is also good.

Further, in the above-mentioned first to fourth embodiments,
Although the caulking jig having a width that causes the overhang before the tip of the metal tube is used, a caulking jig having a width that does not cause the overhang before the tip of the metal tube may be used.

[0020]

As described above, according to the present invention, a taper portion or a multi-step taper portion whose wall thickness decreases toward one end of the metal tube is formed at one end of the metal tube. Using a caulking jig having a width that spans the multi-step taper portion, presses the outer circumference of the metal tube so that the inner circumference of the metal tube has a taper whose inner diameter increases toward the end, Since the pressure fluid supply hose is manufactured by caulking and fixing the pipe to the metal tube, the pressing surface of the caulking jig abuts in parallel with the cylindrical portion of the metal tube, and the metal tube perpendicular to the caulking direction The axial force does not work, the metal tube does not escape in the direction away from the spiral tube,
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 it is possible to generate a pressure wave with a phase different from the phase of the pressure wave traveling in the rubber hose by the spiral tube. Occurs, and the pulsation of the pressure fluid can be reduced. Further, since the caulking position does not shift, the caulking amount can be made constant, and the spiral tube does not come off.

[Brief description of 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 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 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 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 a metal tube and a spiral tube according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a tip shape of a metal tube according to a third embodiment of the present invention.

FIG. 7 is a 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 caulking of a conventional metal tube and a spiral tube.

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 Band member 15 1st taper part 16 2nd taper part 17 Inner circumference taper 20 Caulking jig W Caulking jig width

Claims (2)

[Claims] 1. A spiral tube formed by spirally winding a strip-shaped member on one end of a metal tube, and one end of the spiral tube is pressed by a caulking jig from the outer periphery of the metal tube to caulk and fix the spiral tube. In a method for producing a pressure fluid supply hose in which the metal tube is inserted into a flexible rubber hose capable of expanding and contracting, and the metal tube is fixed to one end of this rubber hose, the wall thickness becomes thinner toward one end of the metal tube toward the end thereof. Forming a tapered portion such that, by using a caulking jig having a width that spans the cylindrical portion and the tapered portion of the metal tube, the inner diameter of the metal tube is increased toward the end on the inner circumference of the one end. A pressure fluid supply characterized in that the spiral tube is caulked and fixed to the metal tube by pressing the outer circumference of the metal tube so as to form an increasing taper. Method of manufacturing a hose. 2. A spiral tube, which is formed by spirally winding a strip-shaped member, is inserted into one end of the metal tube, and the spiral tube is caulked and fixed by pressing from the outer periphery of the metal tube with a caulking jig. In a method of manufacturing a pressure fluid supply hose in which the metal tube is inserted into a flexible rubber hose capable of expanding and contracting, and the metal tube is fixed to one end of the rubber hose, the wall thickness becomes thinner toward one end of the metal tube toward the end thereof. Forming a multi-step taper part consisting of a plurality of tapers of different angles, and using a caulking jig having a width across the cylindrical part of the metal tube and the multi-step taper part, the inside of the one end of the metal tube By pressing the outer circumference of the metal tube so that a taper whose inner diameter increases toward the end of the spiral tube is formed in the metal tube. Manufacturing method of the pressure fluid supply hose, characterized in that the tightening fixed.