JP6990835B2 - Instrument panel hose and its manufacturing method - Google Patents

Description

The present invention relates to an instrument panel hose used as a frame of a vehicle body of an automobile or the like and a method for manufacturing the same.

In front of the vehicle interior of a vehicle body such as an automobile, an instrument panel (instrument panel) in which various display devices such as speedometers and various operation devices such as air conditioning and sound are arranged is used. Further, on the back side of the instrument panel, an instrument panel line hose (steering support beam) is provided as a frame (framework) for supporting the instrument panel, steering, and the like. Both ends of the instrument panel hose are attached to the left and right sides of the vehicle body, and brackets for supporting the steering column are provided at the intermediate positions of the instrument panel hose.

For example, in the steering support beam of Patent Document 1 and its manufacturing method, a second support beam is provided on the outer periphery of the first support beam, and a bracket for attaching a steering column is provided on the outer periphery of the second support beam. There is. Further, in the second support beam, enlarged diameter portions for fixing the bracket are formed at both ends of the mounting position of the bracket.

Japanese Unexamined Patent Publication No. 2006-264469

However, in order to further increase the fixing strength of the bracket to the first support beam and the second support beam, the steering support beam of Patent Document 1 is not sufficient. Specifically, in Patent Document 1, when the first support beam and the second support beam are viewed from a direction orthogonal to their axial directions, the enlarged diameter portion of the second support beam is formed so as to project in a curved surface. Has been done. Therefore, although the position of the bracket in the axial direction of the second support beam can be fixed, there is still room for improvement in the fixing strength. That is, the strength is not sufficient for an external force applied so that the bracket is inclined with respect to the axial direction of the second support beam. In other words, there is room for improvement in order to increase the tilt strength against the external force that tries to tilt the bracket.

Further, in the steering support beam of Patent Document 1, the first support beam and the second support beam are fixed by the enlarged diameter portion formed in a curved surface shape. Therefore, there is room for improvement in order to increase the axial pull-out strength of the second support beam with respect to the first support beam.

The present invention has been made in view of the above problems, and has been obtained in an attempt to provide an instrument panel hose capable of increasing the fixing strength of a bracket to an outer pipe and an inner pipe and a method for manufacturing the same.

One aspect of the first invention is an outer pipe arranged on the driver's seat side, and
It is arranged on the passenger seat side and has an inner end on the driver's seat side that overlaps the inner circumference of the outer end on the passenger seat side of the outer pipe, and has an outer end on the passenger seat side and an inner end on the driver's seat side. The inner pipe that forms a double pipe part with the part,
A bracket having a mounting hole edge mounted on the outer periphery of the double pipe portion is provided.
The double pipe portion is on the outer peripheral side in a state where a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction are in close contact with each other at a portion adjacent to both sides of the mounting hole edge portion in the axial direction. Each has an inflated part formed by expanding to
The contact portion of the outer pipe in the expansion portion, which is in contact with the end surface of the mounting hole edge portion, is in the instrument paneling hose formed in parallel with the end surface of the mounting hole edge portion.

Another aspect of the first invention is an outer pipe arranged on the driver's seat side.
It is arranged on the passenger seat side and has an inner end on the driver's seat side that overlaps the inner circumference of the outer end on the passenger seat side of the outer pipe, and has an outer end on the passenger seat side and an inner end on the driver's seat side. The inner pipe that forms a double pipe part with the part,
A bracket having a mounting hole edge mounted on the outer periphery of the double pipe portion is provided.
The double pipe portion is
The driver's seat side formed by expanding a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction to the outer peripheral side at a portion adjacent to the driver's seat side in the axial direction of the mounting hole edge portion. Inflatable part and
A passenger seat side expansion portion formed by expanding a part of the inner pipe in the axial direction toward the outer peripheral side is provided at a portion adjacent to the passenger seat side in the axial direction of the mounting hole edge portion.
The driver's seat side contact portion of the outer pipe in contact with the end surface of the mounting hole edge portion in the driver's seat side expansion portion is formed in parallel with the end surface of the mounting hole edge portion.
The passenger seat side contact portion of the inner pipe in the passenger seat side expansion portion that comes into contact with the end portion of the outer pipe is located on the instrument paneling hose formed in parallel with the end surface of the mounting hole edge portion.

The reference aspect of the first invention is an outer pipe arranged on the driver's seat side, and
It is arranged on the passenger seat side and has an inner end on the driver's seat side that overlaps the inner circumference of the outer end on the passenger seat side of the outer pipe, and has an outer end on the passenger seat side and an inner end on the driver's seat side. With an inner pipe that forms a double pipe part with the part,
The double pipe portion has a pedestal portion formed by expanding a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction to the outer peripheral side on a part or the whole circumference in the circumferential direction. Have and
On both sides of the pedestal portion, a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction come into contact with each other in a state parallel to each other along a direction intersecting the axial direction. Located on an instrument panel hose that has a contact area.

One aspect of the second invention is the method for manufacturing the instrument panel hose of the first invention.
The outer end of the outer pipe on the passenger seat side is attached to the outer periphery of the inner end of the inner pipe on the driver's seat side to form the double pipe portion and the outer end on the passenger seat side. The mounting process of mounting the mounting hole edge on the outer periphery of the portion,
A pressure is applied from the inner peripheral side to the outer peripheral side on the entire circumference of the double pipe portion, and the axial direction of the outer pipe is applied to the portions of the double pipe portion adjacent to both sides of the mounting hole edge portion in the axial direction. A method for manufacturing an instrument panel hose, comprising an expansion step of expanding a part of the inner pipe and a part of the inner pipe in the axial direction toward the outer peripheral side to form expansion portions on both sides of the mounting hole edge portion in the axial direction. It is in.

(One aspect of the first invention)
In the instrument panel hose of one aspect of the first invention, a part of the outer pipe in the axial direction and a part of the outer pipe in the axial direction are located on both sides of the mounting hole edge in the double pipe portion of the outer pipe and the inner pipe. An expanded portion is formed in which a part of the inner pipe in the axial direction expands toward the outer peripheral side. The contact portion of the outer pipe in the expanded portion, which is in contact with the end surface of the mounting hole edge portion, is formed in parallel with the end surface of the mounting hole edge portion.

Then, by the configuration of the contact portion of the expansion portion, it is possible to increase the tilt strength against the external force for tilting the bracket so that the bracket is tilted with respect to the axial direction of the outer pipe and the inner pipe.
Further, at the contact portion of the expansion portion, a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction are in close contact with each other, thereby increasing the axial pull-out strength of the outer pipe with respect to the inner pipe. You can also do it.

Therefore, according to the instrument panel hose of one aspect of the first invention, the fixing strength of the bracket to the outer pipe and the inner pipe can be increased.

The mounting hole edge portion is a portion of the bracket in which an insertion hole into which the double pipe portion is inserted is formed. The mounting hole edge portion may be a member having a tubular shape with a hollow hole as an insertion hole, or may be a portion formed as a through hole in the bracket.

(Other Aspects of the First Invention)
The instrument panel hose according to the other aspect of the first invention forms an expansion portion when the outer end portion on the passenger seat side of the outer pipe is formed only in the vicinity of the position where the outer end portion overlaps with the mounting hole edge portion of the bracket. It is a thing. In the present embodiment, the expansion portions formed on both sides of the mounting hole edge portion in the axial direction are different from each other as the driver seat side expansion portion and the passenger seat side expansion portion. The passenger seat side expansion portion is formed by an inner pipe that comes into contact with the end portion of the outer pipe. The configuration of the expansion portion on the driver's seat side is the same as the configuration of the expansion portion described above.

The instrument paneling hose of this embodiment can also increase the fixing strength of the bracket to the outer pipe and the inner pipe, as in the case of one embodiment.

( Reference aspect of the first invention)
In the instrument panel hose of the reference aspect of the first invention, a pedestal portion is formed instead of the expansion portion, and the contact portion of the pedestal portion is a part of the outer pipe in the axial direction and one in the axial direction of the inner pipe. The portions are in contact with each other in a state parallel to each other along the direction in which they intersect in the axial direction. Therefore, in the instrument panel hose of this embodiment, the axial pull-out strength of the outer pipe with respect to the inner pipe can be increased by forming the pedestal portion.

Therefore, the instrument paneling hose of this embodiment can also increase the fixing strength of the bracket to the outer pipe and the inner pipe.

(One aspect of the second invention)
In the method for manufacturing an instrument panel hose according to the second aspect of the invention, the mounting hole edge portion is in a state where the mounting hole edge portions of the outer pipe, the inner pipe, and the bracket are triplely overlapped by performing the mounting step and the expansion step. Inflated parts are formed on both sides in the axial direction of. Then, by forming the expansion portion, the outer pipe, the inner pipe, and the bracket can be assembled at the same time.

Therefore, according to the instrument paneling hose manufacturing method of this embodiment, the instrument paneling hose manufacturing time is compared with the case where the bracket is fitted to the outer pipe and the outer pipe is fitted to the inner pipe separately. Can be shortened.

The perspective view which shows the instrument paneling hose which concerns on Embodiment 1. FIG. FIG. 5 is a cross-sectional view showing the periphery of the double pipe portion of the instrument paneling hose according to the first embodiment. FIG. 2 is a sectional view taken along line III-III of FIG. 2 according to the first embodiment. FIG. 5 is a cross-sectional view showing a molding die of the instrument paneling hose molding apparatus according to the first embodiment. FIG. 5 is a cross-sectional view showing a state in which a molding die is arranged on the outer periphery of the outer pipe and the inner pipe according to the first embodiment. FIG. 5 is a cross-sectional view showing a state in which a first expansion portion is formed in a double pipe portion according to the first embodiment. FIG. 6 is an enlarged cross-sectional view showing a part of FIG. 6 according to the first embodiment. FIG. 6 is a cross-sectional view taken along the line VIII-VIII of FIG. 6, showing a state in which the first expansion portion is formed along the molding surface of the molding die according to the first embodiment. FIG. 5 is an enlarged cross-sectional view showing a state in which another first expansion portion is formed in the double pipe portion according to the first embodiment. FIG. 2 is a cross-sectional view showing the periphery of the double pipe portion of the instrument paneling hose according to the second embodiment. FIG. 2 is a sectional view corresponding to III-III of FIG. 2, showing the periphery of the double pipe portion of the instrument paneling hose according to the third embodiment. A cross-sectional view showing the periphery of the double pipe portion of the instrument paneling hose according to the reference form . FIG. 12 is a cross-sectional view taken along the line XIII-XIII of FIG. 12, showing the periphery of the double pipe portion of the instrument paneling hose according to the reference form . FIG. 3 is a cross-sectional view showing the periphery of the double pipe portion of the instrument paneling hose according to another embodiment.

A preferred embodiment of the above-mentioned instrument paneling hose and a method for manufacturing the same will be described with reference to the drawings.
<Embodiment 1>
As shown in FIGS. 1 and 2, the instrument panel hose 1 of the present embodiment includes an outer pipe 2, an inner pipe 3, a first bracket 5A, and the like. The outer pipe 2 is arranged on the driver's seat side D1. The inner pipe 3 is arranged on the passenger seat side D2. The inner pipe 3 has an inner end portion 301 of the driver's seat side D1 that overlaps the inner circumference of the outer end portion 202 of the passenger seat side D2 of the outer pipe 2. The double pipe portion 4 is formed by the outer end portion 202 of the passenger seat side D2 and the inner end portion 301 of the driver seat side D1. The first bracket 5A has a mounting hole edge portion 51 mounted on the outer periphery of the double pipe portion 4.

As shown in FIG. 2, the double pipe portion 4 has a portion of the outer pipe 2 in the axial direction D and the inner pipe 3 in the axial direction D at a portion adjacent to both sides of the mounting hole edge portion 51 in the axial direction D. Each has a first expansion portion 41 formed by expanding toward the outer peripheral side in a state where a part thereof is in close contact with each other. The first expansion portion 41 is formed in pairs of one adjacent to the end surface 511 of the driver's seat side D1 of the mounting hole edge portion 51 and one adjacent to the end surface 512 of the passenger seat side D2 of the mounting hole edge portion 51. There is. As shown in FIG. 7, the contact portion 411 of the outer pipe 2 in contact with the tapered surfaces 511X and 512X of the end faces 511, 512 of the mounting hole edge portion 51 in the first expansion portion 41 is parallel to the tapered surfaces 511X and 512X. It is formed.

Here, the axial direction D means a direction along the central axis of the outer pipe 2 and the inner pipe 3. The instrument panel hose 1 is arranged on the vehicle body along the vehicle width direction. The driver's seat side D1 refers to the side on which the driver's seat is arranged in the vehicle width direction of the vehicle body to which the instrument paneling hose 1 is attached. The passenger seat side D2 means the side opposite to the side where the driver's seat is arranged.

The instrument paneling hose 1 of this embodiment and a method for manufacturing the same will be described in more detail below.
As shown in FIG. 1, the instrument panel hose 1 is used as a frame for supporting an instrument panel (instrument panel) arranged in front of the passenger compartment of an automobile body from the back side when viewed from the passenger compartment. To. The instrument panel hose 1 is also used as a frame for supporting the steering column 11 which is a part of the steering device. Both ends of the instrument panel hose 1 are attached to the left and right sides of the vehicle body. The instrument panel hose 1 is also called a steering support beam. The outer pipe 2, the inner pipe 3, the first bracket 5A and the like are made of a metal material such as iron, stainless steel and aluminum, or CFRP (carbon fiber reinforced plastic).

(Outer pipe 2)
As shown in FIG. 1, the outer pipe 2 is arranged on the driver's seat side D1 in order to increase the strength of the portion of the driver's seat side D1 on which the steering column 11 is arranged in the entire length of the instrument panel hose 1. The double pipe portion 4 is not formed in the entire outer pipe 2, but is formed only in the outer end portion 202 of the passenger seat side D2 of the outer pipe 2. Further, the outer pipe 2 is arranged at a position facing the steering column 11 in the vehicle width direction of the vehicle body. The outer pipe 2 is formed adjacent to a small diameter portion 21 that overlaps the outer periphery of the inner pipe 3 to form a double pipe portion 4 and a diameter larger than that of the small diameter portion 21 and adjacent to the driver's seat side D1 of the small diameter portion 21. It has a large diameter portion 22.

(Inner pipe 3)
The inner pipe 3 is arranged on the passenger seat side D2 in the entire length of the instrument panel hose 1. The inner pipe 3 is formed longer than the outer pipe 2.

(1st to 4th brackets 5A, 5B, 5C, 5D)
As shown in FIG. 1, the instrument panel hose 1 of the present embodiment has a plurality of brackets 5A, 5B, 5C, 5D. The instrument panel hose 1 has a first bracket 5A attached to the double pipe portion 4, a second bracket 5B attached to the outer end portion 201 of the driver's seat side D1 of the outer pipe 2, and a large diameter portion 22 of the outer pipe 2. The third bracket 5C attached to the outer periphery of the inner pipe 3 and the fourth bracket 5D attached to the inner end 302 of the passenger side D2 of the inner pipe 3 are provided. The first bracket 5A is fixed to the frame 12 located in front of the vehicle interior of the vehicle body. The second bracket 5B and the fourth bracket 5D are fixed to the frame 12 located on the left and right sides of the vehicle body. The steering column 11 is fixed to the third bracket 5C.

As shown in FIGS. 2 and 3, the first bracket 5A is provided with the outer pipe 2 and the outer pipe 5A by the first expansion portion 41 formed by a part of the outer pipe 2 in the axial direction D and a part of the inner pipe 3 in the axial direction D. It is attached to the inner pipe 3. Further, as shown in FIG. 1, the second bracket 5B is attached to the outer pipe 2 by a second expansion portion 42 formed by a part of the outer pipe 2 in the axial direction D. Further, the third bracket 5C is attached to the outer pipe 2 by a third expansion portion 43 formed by a part of the outer pipe 2 in the axial direction D. Further, the fourth bracket 5D is attached to the inner pipe 3 by a fourth expansion portion 44 formed by a part of the inner pipe 3 in the axial direction D. The first bracket 5A is attached to the double pipe portion 4, and the second to fourth brackets 5B, 5C, 5D are attached to the single pipe portion.

As shown in FIG. 2, each of the first to fourth brackets 5A, 5B, 5C, and 5D is formed with an insertion hole 510 through which the outer pipe 2 or the inner pipe 3 is inserted. A mounting hole edge portion 51 is formed around the insertion holes 510 of the brackets 5A, 5B, 5C, and 5D.

As shown in FIG. 7, the mounting hole edge portions of the mounting hole edge portions 51 of the first bracket 5A of the present embodiment have mounting hole edges on the inner peripheral side corners of the end faces 511, 512 on both sides in the axial direction D toward the inner peripheral side. Tapered surfaces 511X and 512X are formed to reduce the width of the axial direction D of 51. The contact portion 411 of the outer pipe 2 is formed in close contact with the tapered surfaces 511X and 512X and parallel to the tapered surfaces 511X and 512X.

(First expansion portion 41 of the double pipe portion 4)
As shown in FIGS. 2 and 3, the first expansion portion 41 of the present embodiment has a large area of the contact portion 411 of the outer pipe 2 that contacts the tapered surfaces 511X and 512X of the mounting hole edge portion 51. Is. Then, the contact portion 411 of the outer pipe 2 comes into contact with the tapered surfaces 511X and 512X of the mounting hole edge portion 51 in a state parallel to each other. Further, the first expansion portion 41 is formed over the entire circumference of the outer pipe 2 and the inner pipe 3 in the circumferential direction C.

As shown in FIGS. 2 and 7, the tapered surfaces 511X and 512X of the mounting hole edge portion 51 and the contact portion 411 of the outer pipe 2 in the first expansion portion 41 are formed so as to be inclined with respect to the axial direction D. There is. Further, the contact portion 414 of the inner pipe 3 that contacts the contact portion 411 of the outer pipe 2 is also formed in parallel with the tapered surfaces 511X and 512X of the mounting hole edge portion 51 and the contact portion 411 of the outer pipe 2. As a result, the bracket is less likely to fall from the state perpendicular to the axial direction D, and is less likely to be pulled out in the axial direction D.

Further, the first expansion portion 41 has a shape that allows the contact portion 411 of the outer pipe 2 and the contact portion 414 of the inner pipe 3 to appropriately secure an amount of protrusion in the direction perpendicular to the axial direction D. As shown in FIG. 9, a part of the outer pipe 2 in the axial direction D and a part of the inner pipe 3 in the axial direction D forming the first expansion portion 41 are formed as parallel portions 412 parallel to the axial direction D. It may have been done. By forming the parallel portion 412, the first expansion portion 41 of the inner pipe 3 can be easily arranged on the inner peripheral side of the first expansion portion 41 of the outer pipe 2. Then, the tilt strength and the pull-out strength of the first bracket 5A can be further increased.

The opposite portion 413 of the first expansion portion 41 located on the opposite side of the axial direction D with respect to the contact portion 411 is formed so as to be inclined in the axial direction D. The first expansion portion 41 of the outer pipe 2 of the present embodiment is formed by a contact portion 411 and an opposite side portion 413 in which a part of the outer pipe 2 in the axial direction D is deformed. The first expansion portion 41 of the inner pipe 3 is formed in a shape along the inner peripheral side of the first expansion portion 41 of the outer pipe 2.

(2nd to 4th expansion portions 42, 43, 44)
As shown in FIG. 1, the second expansion portion 42 is formed by expanding a portion of the outer pipe 2 adjacent to both sides of the second bracket 5B in the axial direction D to the outer peripheral side. It is a thing. The third expansion portion 43 is formed by expanding a portion of the outer pipe 2 in the axial direction D and adjacent to both sides of the third bracket 5C in the axial direction D to the outer peripheral side. The fourth expansion portion 44 is formed by expanding a portion of the inner pipe 3 in the axial direction D and adjacent to both sides of the fourth bracket 5D in the axial direction D to the outer peripheral side.

The second to fourth expansion portions 42, 43, 44 are formed in the portion of the single pipe formed by the outer pipe 2 or the inner pipe 3. The shape of the second to fourth expansion portions 42, 43, 44 protruding toward the outer peripheral side can be the same as in the case of the first expansion portion 41. Further, the second to fourth expansion portions 42, 43, 44 may be formed in a shape protruding toward the outer peripheral side in a curved surface shape.

(Molding device 6)
As shown in FIGS. 4 to 6, the forming apparatus 6 of the instrument panel hose 1 performs partial diameter expansion processing of the outer pipe 2 and the inner pipe 3. By this partial diameter expansion processing, the outer pipe 2 and the inner pipe 3 are fitted to each other, and the first to fourth brackets 5A, 5B, 5C, 5D to at least one of the outer pipe 2 and the inner pipe 3 are fitted to each other. Is also installed.

The molding apparatus 6 is a pressurizing unit 61 that applies pressure from the inner peripheral side to the outer peripheral side with respect to at least one of the outer pipe 2 and the inner pipe 3, and molding is arranged on the outer peripheral side of the outer pipe 2 or the inner pipe 3. A mold 62 is provided. The pressurizing unit 61 of the present embodiment is composed of a bulge forming unit that applies pressure from the inside to an object having a tube shape, a vessel shape, or the like. The bulge forming unit includes an elastic deformation member 611 made of an elastic material such as rubber or an elastomer, which is arranged at a processing portion (a portion to be expanded toward the outer peripheral side) of the outer pipe 2 and the inner pipe 3, and elastic deformation. It has a pair of punches 612 that pressurize the member 611 from both sides in the axial direction D.

The elastically deformable member 611 is formed of a solid elastic material. One of the pair of punches 612 can be fixed to the base base of the pressurizing unit 61, and the other of the pair of punches 612 can be attached to the movable rod of the hydraulic cylinder. Then, when the movable rod of the hydraulic cylinder is stroked, the elastic deformation member 611 is compression-deformed by a pair of punches 612, and the elastic deformation member 611 expands to the unrestrained portion H in at least one of the outer pipe 2 and the inner pipe 3. By doing so, the unrestrained portion H can be deformed to the outer peripheral side. The non-constrained portion H refers to a space portion in the outer pipe 2 and the inner pipe 3 that is not constrained by any of the brackets 5A to 5D and the molding die 62.

By compressing the elastically deforming member 611 by the pair of punches 612, pressure is applied from the elastically deforming member 611 to the inner peripheral side of the outer pipe 2 and the inner pipe 3 substantially uniformly. The portions of the outer pipe 2 and the inner pipe 3 that come into contact with the brackets 5A to 5D or the molding surface 621 of the molding die 62 hardly expand.

Further, when the parallel portion 412 shown in FIG. 9 is formed on the outer pipe 2 and the inner pipe 3, the concave portion 622 for forming the parallel portion 412 and the outer pipe 2 on the molding surface 621 of the molding die 62 are formed. Each material of the outer pipe 2 and the inner pipe 3 flows so as to fill the gap S. Then, the parallel portion 412 is formed by transferring the shape of the molding surface 621. In the figure, the state before molding (before deformation) of the outer pipe 2 and the inner pipe 3 is shown by a two-dot chain line.

The pressurizing unit 61 can be various units that generate pressure, in addition to being a bulge forming unit. For example, the pressurizing unit 61 can also be configured by a hydroforming unit that applies pressure from the inside to an object having a tube shape, a vessel shape, or the like by utilizing the pressure of a liquid such as hydraulic pressure or water pressure. Molding with a hydroforming unit is also called hydroforming.

As shown in FIG. 4, the molding die 62 has a molding surface 621 that receives deformation of the outer pipe 2 or the inner pipe 3 pressurized by the pressurizing unit 61. The molding surface 621 is formed with portions for molding the first to fourth expansion portions 41, 42, 43, 44 and the like. As shown in FIG. 8, the molding die 62 is formed by being divided into a plurality of parts in the circumferential direction C of the outer pipe 2 and the inner pipe 3 in order to facilitate the arrangement and removal of the outer pipe 2 and the inner pipe 3. There is.

The mold 62 avoids interference with the first to fourth brackets 5A, 5B, 5C, and 5D, and the first to fourth brackets 62 are on both sides of the first to fourth brackets 5A, 5B, 5C, and 5D in the axial direction D. It is formed in a shape that forms the expansion portions 41, 42, 43, 44.

(Production method)
In manufacturing the instrument panel hose 1, the outer pipe 2 (pipe material) before molding, the inner pipe 3 (pipe material) before molding, and the first to fourth brackets 5A, 5B, 5C, 5D are prepared. do. Then, in the mounting process, the outer end portion 202 of the passenger seat side D2 of the outer pipe 2 is mounted on the outer periphery of the inner end portion 301 of the driver's seat side D1 of the inner pipe 3 to form the double pipe portion 4. ..

Further, the mounting hole edge portion 51 of the first bracket 5A is mounted on the outer periphery of the outer end portion 202 of the passenger seat side D2 in the double pipe portion 4. Further, the mounting hole edge 51 of the second bracket 5B is mounted on the outer periphery of the outer end 201 of the driver's seat side D1, and the mounting hole edge 51 of the third bracket 5C is mounted on the outer periphery of the large diameter portion 22 of the outer pipe 2. The mounting hole edge 51 of the fourth bracket 5D is mounted on the outer periphery of the inner end 302 of the passenger seat side D2.

Further, as shown in FIG. 5, the molding die 62 is arranged on the outer periphery of the outer pipe 2 and the inner pipe 3 while avoiding interference with the first to fourth brackets 5A, 5B, 5C, and 5D. At this time, the molding surface 621 of the molding die 62 does not face the portion where the first to fourth expansion portions 41, 42, 43, 44 of the outer pipe 2 and the inner pipe 3 are formed from the outer peripheral side.

Next, in the expansion step, the elastic deformation member 611 of the pressure unit 61 is arranged on the inner peripheral side of the outer pipe 2 and the inner pipe 3. Then, as shown in FIGS. 6 and 7, a pair of punches 612 of the pressurizing unit 61 compressively deforms the elastically deforming member 611 from both sides in the axial direction D. At this time, the elastically deforming member 611 receives pressure from the pair of punches 612 and swells toward the outer periphery in the outer pipe 2 and the inner pipe 3. Further, in the double pipe portion 4 in which the elastically deforming member 611 is arranged, pressure is applied from the inner peripheral side to the outer peripheral side on the entire circumference of the outer pipe 2 and the inner pipe 3 in the circumferential direction C.

Then, as shown in FIGS. 6 to 8, in the portion adjacent to both sides of the mounting hole edge portion 51 of the first bracket 5A in the axial direction D, where the first expansion portion 41 is formed, the outer is formed. The material in a part of the pipe 2 and the inner pipe 3 in the axial direction D expands and deforms toward the outer peripheral side of the unconstrained portion H. Further, also in the portion where the second to fourth expansion portions 42, 43, 44 are formed, the material in a part of the outer pipe 2 or the inner pipe 3 in the axial direction D expands toward the outer peripheral side of the unconstrained portion H. Transforms.

In this way, the materials of the outer pipe 2 or the inner pipe 3 are in close contact with both sides of the mounting hole edge portions 51 of the first to fourth brackets 5A, 5B, 5C, and 5D in the axial direction D, and the first to fourth expansion portions are formed. 41, 42, 43, 44 are formed. In the first to fourth expansion portions 41, 42, 43, 44, the contact portions 411 that are in close contact with the tapered surfaces 511X, 512X of the mounting hole edge portions 51 of the first to fourth brackets 5A, 5B, 5C, 5D It is formed. Then, the instrument panel hose 1 to which the outer pipe 2, the inner pipe 3 and the first to fourth brackets 5A, 5B, 5C, and 5D are fitted is manufactured.

(Action effect)
In the instrument panel hose 1 of the present embodiment, the first expansion portions 41 of the double pipe portion 4 are formed on both sides of the mounting hole edge portion 51 of the first bracket 5A in the axial direction D. The contact portion 411 of the outer pipe 2 in the first expansion portion 41 that comes into contact with the tapered surfaces 511X and 512X of the mounting hole edge portion 51 is formed in parallel with the tapered surfaces 511X and 512X of the mounting hole edge portion 51. Further, the contact portion 414 of the inner pipe 3 that contacts the contact portion 411 of the outer pipe 2 is also formed in parallel with the tapered surfaces 511X and 512X of the mounting hole edge portion 51 and the contact portion 411 of the outer pipe 2.

Then, with the configuration of the contact portions 411 and 414 of the first expansion portion 41, the first bracket 5A is tilted so that the first bracket 5A is tilted with respect to the axial direction D of the outer pipe 2 and the inner pipe 3. It is possible to increase the tilting strength against external force.
Further, in each of the contact portions 411 and 414 of the first expansion portion 41, a part of the axial direction D of the outer pipe 2 and a part of the axial direction D of the inner pipe 3 are in close contact with each other, so that the inner pipe 3 is in close contact with the inner pipe 3. It is also possible to increase the pull-out strength of the outer pipe 2 in the axial direction D.

Therefore, according to the instrument panel hose 1 of the present embodiment, the fixing strength of the first bracket 5A to the outer pipe 2 and the inner pipe 3 can be increased.

Further, in the method for manufacturing the instrument panel hose 1 of the present embodiment, the mounting hole edge portion 51 of the outer pipe 2, the inner pipe 3, and the first bracket 5A is triple-stacked in the axial direction of the mounting hole edge portion 51. First expansion portions 41 are formed on both sides of D. Further, in a state where the outer pipe 2 or the inner pipe 3 and the mounting hole edge portions 51 of the second to fourth brackets 5B, 5C, 5D are doubly overlapped, both sides of the mounting hole edge portion 51 in the axial direction D are overlapped. The second to fourth expansion portions 42, 43, 44 are formed on the surface. In particular, by forming the first expansion portion 41, the outer pipe 2, the inner pipe 3 and the first bracket 5A can be assembled at the same time.

Therefore, according to the method for manufacturing the instrument panel hose 1 of the present embodiment, as compared with the case where the first bracket 5A is sewn into the outer pipe 2 and the outer pipe 2 is sewn into the inner pipe 3 separately. , The manufacturing time of the instrument paneling hose 1 can be shortened.

<Embodiment 2>
As shown in FIG. 10, the instrument panel hose 1 of the present embodiment is formed only to the vicinity of the position where the outer end portion 202 of the passenger seat side D2 of the outer pipe 2 overlaps the mounting hole edge portion 51 of the first bracket 5A. In the absence, the first expansion portions 41A and 41B are formed. The driver's seat side first expansion portion 41A located on the driver's seat side D1 in the axial direction D of the mounting hole edge portion 51 of the first bracket 5A of the present embodiment is formed on the outer pipe 2 and the inner pipe 3. The first expansion portion 41A on the driver's seat side is a part of the axial direction D of the outer pipe 2 and one of the axial directions D of the inner pipe 3 at a portion adjacent to the driver's seat side D1 in the axial direction D of the mounting hole edge portion 51. The portion is formed by expanding toward the outer peripheral side.

On the other hand, the passenger seat side first expansion portion 41B located on the passenger seat side D2 in the axial direction D of the mounting hole edge portion 51 of the first bracket 5A is formed in the inner pipe 3. The passenger seat side first expansion portion 41B is formed by expanding a part of the inner pipe 3 in the axial direction D toward the outer peripheral side at a portion adjacent to the passenger seat side D2 in the axial direction D of the mounting hole edge portion 51. There is. Further, in the present embodiment, the end portion 203 of the outer pipe 2 overlaps the outer periphery of the passenger seat side first expansion portion 41B by the inner pipe 3.

As shown in the figure, in the driver's seat side first expansion portion 41A, the driver's seat side contact portion 411 of the outer pipe 2 in contact with the tapered surface 511X of the mounting hole edge portion 51 of the first bracket 5A is the mounting hole edge portion. It is formed parallel to the tapered surface 511X of 51. Further, the driver's seat side contact portion 414 of the inner pipe 3 that comes into contact with the driver's seat side contact portion 411 of the outer pipe 2 is parallel to the tapered surface 511X of the mounting hole edge portion 51 and the driver's seat side contact portion 411 of the outer pipe 2. It is formed.

On the other hand, the passenger seat side contact portion 415 formed at the end portion 203 of the outer pipe 2 in contact with the tapered surface 512X of the mounting hole edge portion 51 of the first bracket 5A in the passenger seat side first expansion portion 41B is mounted. It is formed parallel to the tapered surface 512X of the hole edge portion 51. Further, the passenger seat side contact portion 416 of the inner pipe 3 that comes into contact with the passenger seat side contact portion 415 of the outer pipe 2 is parallel to the tapered surface 512X of the mounting hole edge portion 51 and the passenger seat side contact portion 415 of the outer pipe 2. It is formed.

Also in the driver's seat side first expansion portion 41A of the present embodiment, the parallel portion 412 is formed by a part of the axial direction D of the outer pipe 2 and a part of the axial direction D of the inner pipe 3 as in the case of the first embodiment. It may have been done. Further, also in the passenger seat side first expansion portion 41B of the present embodiment, the parallel portion 412 may be formed by a part of the axial direction D of the inner pipe 3 as in the case of the first embodiment.

Other configurations, manufacturing methods, operational effects, and the like of the instrument panel hose 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

<Embodiment 3>
In the instrument panel hose 1 of the present embodiment, as shown in FIG. 11, the first expansion portions 41 located on both sides of the mounting hole edge portion 51 of the first bracket 5A in the axial direction D are the circumferences of the double pipe portion 4. It is formed dispersedly in a plurality of places in the direction C. The distributed first expansion portion 41 of the present embodiment shows the case where it is applied to the instrument panel hose 1 of the first embodiment. Although not shown, recesses for forming the first expansion portions 41 dispersed in a plurality of locations in the circumferential direction C are formed on the molding surface of the molding mold used in the method for manufacturing the instrument panel hose 1 of the present embodiment. Has been done.

The first expansion portion 41 of the present embodiment is formed dispersedly at four locations in the circumferential direction C. The first expansion portion 41 can be formed, for example, in a dispersed manner at 2 to 6 locations in the circumferential direction C. The first expansion portion 41 may be formed in an arc shape offset to the outer peripheral side of the outer pipe 2 and drawn around the central axis of the outer pipe 2.

In the present embodiment, the first expansion portion 41 is arranged in a state of forming irregularities in the circumferential direction C of the outer pipe 2 and the inner pipe 3. As a result, the torsional strength of the outer pipe 2 and the inner pipe 3 in the circumferential direction C can be increased.

Further, in the method for manufacturing the instrument panel hose 1 of the present embodiment, since the first expansion portion 41 may be partially formed in the circumferential direction C, the area for forming the first expansion portion 41 is reduced. As a result, when forming the first expansion portion 41, the pressure applied to the elastically deforming member 611 from the pair of punches 612 in the pressurizing unit 61 can be reduced.

Other configurations, manufacturing methods, operational effects, and the like of the instrument panel hose 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

The configuration of this embodiment may be applied to the instrument panel hose 1 of the second embodiment. In this case, the driver's seat side first expansion portion 41A and the passenger seat side first expansion portion 41B are formed at a plurality of locations in the circumferential direction C of the double pipe portion 4.

< Reference form >
In the instrument panel hose 1 of the present embodiment, as shown in FIGS. 12 and 13, various small parts 5E are attached to the pedestal portion 45 formed in the double pipe portion 4. In the double pipe portion 4, the outer pipe 2 and the inner pipe 3 are fixed by the pedestal portion 45.

The small component 5E of the present embodiment has a mounting portion 52 attached to the outer periphery of the double pipe portion 4. The double pipe portion 4 of the present embodiment is formed at a plurality of locations in the circumferential direction C by expanding a part of the axial direction D of the outer pipe 2 and a part of the axial direction D of the inner pipe 3 toward the outer peripheral side. It has a pedestal portion 45. The pedestal portion 45 is formed so as to be dispersed at a plurality of locations in the circumferential direction C of the double pipe portion 4. The pedestal portion 45 of this embodiment is formed at two locations that are substantially 180 ° out of phase in the circumferential direction C. The pedestal portion 45 may be formed so as to be dispersed at three or more locations in the circumferential direction C of the double pipe portion 4.

The plurality of pedestals 45 of this embodiment are formed at the same position in the axial direction D. The pedestals 45 at a plurality of positions may be formed at positions deviated from each other in the axial direction D. However, in this case, it is preferable that parts of the pedestal portions 45 overlap each other in the circumferential direction C.

On both sides of the axial direction D of the pedestal portion 45, a part of the axial direction D of the outer pipe 2 and a part of the axial direction D of the inner pipe 3 intersect each other (inclined) along the axial direction D. It has a contact portion 451 that contacts in parallel. The pedestal portion 45 of the present embodiment is formed in a state in which a part of the outer pipe 2 and the inner pipe 3 in the axial direction D is offset toward the outer peripheral side in a cross section perpendicular to the axial direction D.

As shown in FIGS. 12 and 13, the mounting portion 52 of the small component 5E is mounted on the mounted portion 452 formed between the axial directions D of the contact portion 451 in the pedestal portion 45. The mounted portion 452 is formed flat as an apex portion of the pedestal portion 45 in order to facilitate mounting of the mounting portion 52. Further, the attached portion 452 of the present embodiment is formed as a flat portion along the axial direction D. The attached portion 452 does not necessarily have to be formed in a flat shape, and may not necessarily be formed along the axial direction D.

The attachment portion 52 of the small component 5E is attached to the attached portion 452 of the pedestal portion 45 by bolting, joining by welding, or the like. Further, the mounting portion 52 of the small component 5E may be mounted so as to straddle the mounted portion 452 of the pedestal portions 45 at a plurality of locations.

In the method for manufacturing the instrument panel hose 1 of the present embodiment, the pedestal portion 45 is formed by using the molding apparatus 6 having the pressurizing unit 61 and the molding die 62 shown in the first embodiment. The pedestal portion 45 is formed in the same manner as in the case of forming the first expansion portion 41. In this embodiment, when the molding die 62 of the molding apparatus 6 is arranged in the outer pipe 2 and the inner pipe 3, it is not necessary to avoid the small parts 5E and the arrangement is easy.

In the instrument panel hose 1 of the present embodiment, the attachment portion 52 of the small component 5E is attached to the attached portion 452 of the pedestal portion 45 of the double pipe portion 4. With this configuration, it is possible to increase the tilting strength against an external force for tilting the small component 5E so that the small component 5E is tilted with respect to the axial direction D of the outer pipe 2 and the inner pipe 3.

Further, on both sides of the pedestal portion 45 in the axial direction D, a part of the outer pipe 2 in the axial direction D and a part of the inner pipe 3 in the axial direction D are parallel to each other along the direction inclined in the axial direction D. By forming the contact portion 451 that comes into contact with the inner pipe 3, it is possible to increase the pull-out strength of the outer pipe 2 with respect to the inner pipe 3 in the axial direction D.

The pedestal portion 45 can also be formed on the entire circumference of the double pipe portion 4 in the circumferential direction C. In this case, the pedestal portion 45 can be formed into a cylindrical shape, and can also be formed into a polygonal shape having a quadrangle or more when viewed from the axial direction D. Further, in this case, it is also possible to form a plurality of flat mounted portions 452 which are continuous in the circumferential direction C of the pedestal portion 45.

Other configurations, manufacturing methods, operational effects, and the like of the instrument panel hose 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

<Other embodiments>
Further, as shown in FIG. 14, the first expansion portion 41 adjacent to one side of the axial direction D of the mounting hole edge portion 51 is formed in a shape having a parallel portion 412, and the axial direction D of the mounting hole edge portion 51 is formed. The first expansion portion 41 adjacent to the other side of the above may be formed in a shape having no parallel portion 412. In this case, small parts 5E and the like can be attached to the parallel portion 412.

Other configurations, manufacturing methods, operational effects, and the like of the instrument panel hose 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

The present invention is not limited to each embodiment, and further different embodiments can be configured without departing from the gist thereof. In addition, the present invention includes various modifications, modifications within a uniform range, and the like.

1 Instrument panel hose 2 Outer pipe 3 Inner pipe 4 Double pipe part 41 First expansion part (expansion part)
411 Contact part 412 Parallel part 45 Pedestal part 451 Contact part 452 Attached part 5A 1st bracket (bracket)
51 Mounting hole edge 511X, 512X Tapered surface

Claims (9)

The outer pipe placed on the driver's side and
It is arranged on the passenger seat side and has an inner end on the driver's seat side that overlaps the inner circumference of the outer end on the passenger seat side of the outer pipe, and has an outer end on the passenger seat side and an inner end on the driver's seat side. The inner pipe that forms a double pipe part with the part,
A bracket having a mounting hole edge mounted on the outer periphery of the double pipe portion is provided.
The double pipe portion is on the outer peripheral side in a state where a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction are in close contact with each other at a portion adjacent to both sides of the mounting hole edge portion in the axial direction. Each has an inflated part formed by expanding to
An instrument panel hose in which the contact portion of the outer pipe in contact with the end surface of the mounting hole edge portion in the expansion portion is formed in parallel with the end surface of the mounting hole edge portion. Tapered surfaces are formed on both end faces of the mounting hole edge portion in the axial direction so that the width of the mounting hole edge portion in the axial direction becomes smaller toward the inner peripheral side.
The contact portion of the outer pipe is formed in close contact with the tapered surface and parallel to the tapered surface.
The instrument panel hose according to claim 1, wherein the contact portion of the inner pipe that contacts the contact portion of the outer pipe is formed in parallel with the tapered surface of the mounting hole edge portion and the contact portion of the outer pipe. .. The invention according to claim 1 or 2, wherein a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction forming the expansion portion are formed as parallel portions parallel to the axial direction. Instrument panel hose. The instrument panel hose according to any one of claims 1 to 3, wherein the expansion portion is dispersedly formed at a plurality of locations in the circumferential direction of the double pipe portion. The outer pipe placed on the driver's side and
It is arranged on the passenger seat side and has an inner end on the driver's seat side that overlaps the inner circumference of the outer end on the passenger seat side of the outer pipe, and has an outer end on the passenger seat side and an inner end on the driver's seat side. The inner pipe that forms a double pipe part with the part,
A bracket having a mounting hole edge mounted on the outer periphery of the double pipe portion is provided.
The double pipe portion is
The driver's seat side formed by expanding a part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction to the outer peripheral side at a portion adjacent to the driver's seat side in the axial direction of the mounting hole edge portion. Inflatable part and
A passenger seat side expansion portion formed by expanding a part of the inner pipe in the axial direction toward the outer peripheral side is provided at a portion adjacent to the passenger seat side in the axial direction of the mounting hole edge portion.
The driver's seat side contact portion of the outer pipe in contact with the end surface of the mounting hole edge portion in the driver's seat side expansion portion is formed in parallel with the end surface of the mounting hole edge portion.
An instrument panel hose in the passenger seat side expansion portion, wherein the passenger seat side contact portion of the inner pipe that comes into contact with the end portion of the outer pipe is formed in parallel with the end surface of the mounting hole edge portion. Tapered surfaces are formed on both end faces of the mounting hole edge portion in the axial direction so that the width of the mounting hole edge portion in the axial direction becomes smaller toward the inner peripheral side.
The driver's seat side contact portion of the outer pipe is formed in close contact with the tapered surface and parallel to the tapered surface.
The driver's seat side contact portion of the inner pipe that contacts the driver's seat side contact portion of the outer pipe is formed in parallel with the tapered surface of the mounting hole edge portion and the driver's seat side contact portion of the outer pipe. The instrument paneling hose according to claim 5. A part of the outer pipe in the axial direction and a part of the inner pipe in the axial direction forming the expansion portion on the driver's seat side are formed as parallel portions parallel to the axial direction.
The instrument panel hose according to claim 5 or 6, wherein a part of the inner pipe in the axial direction forming the passenger seat side expansion portion is formed as a parallel portion parallel to the axial direction. The instrument panelin according to any one of claims 5 to 7, wherein the driver's seat side expansion portion and the passenger seat side expansion portion are dispersedly formed at a plurality of locations in the circumferential direction of the double pipe portion. hose. The method for manufacturing an instrument panel hose according to any one of claims 1 to 8.
The outer end of the outer pipe on the passenger seat side is attached to the outer periphery of the inner end of the inner pipe on the driver's seat side to form the double pipe portion and the outer end on the passenger seat side. The mounting process of mounting the mounting hole edge on the outer periphery of the portion,
A pressure is applied from the inner peripheral side to the outer peripheral side on the entire circumference of the double pipe portion, and the axial direction of the outer pipe is applied to the portions of the double pipe portion adjacent to both sides of the mounting hole edge portion in the axial direction. A method for manufacturing an instrument panel hose, comprising an expansion step of expanding a part of the inner pipe and a part of the inner pipe in the axial direction toward the outer peripheral side to form expansion portions on both sides of the mounting hole edge portion in the axial direction. ..

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