JP6951261B2 - Piping fixing structure and piping fixing method - Google Patents

Description

The present invention relates to a pipe fixing structure and a pipe fixing method, and more particularly to a pipe fixing structure and a pipe fixing method for attaching a pipe to a vehicle body or the like using a clamp.

In a mechanical structure such as a vehicle, pipes are arranged to distribute various fluids at predetermined locations thereof. These pipes are fixed in place by using a fixing means such as a clamp. In the general pipe fixing method, since the pipe is fixed to the vehicle body side by using a clamp, there is a problem that the pipe moves from a predetermined position due to the vibration generated when the vehicle travels.

Further, in order to deal with such a problem, it is conceivable to use a pipe having a bellows shape, and the following patent documents describe inventions relating to a bellows-shaped pipe.

In Patent Document 1, the resin pipe state is composed of a rigid portion and a flexible portion, and the flexible portion is formed into a bellows shape. Further, the matter of forming the rigid portion and the flexible portion from a specific synthetic resin is described. By doing so, the flexibility of the flexible portion can be improved, and further, the pairing property can be improved.

In Patent Document 2, a part of the hose is molded into a concave-convex bellows shape. In addition, a cotton-like reinforcing member is provided along the recess of the bellows. By doing so, the hose can be fixed in the circumferential direction, and the pressure resistance of the hose can be improved.

Japanese Unexamined Patent Publication No. 4-282232 Japanese Unexamined Patent Publication No. 2015-227716

However, it has not been easy to firmly fix the pipe on which the bellows-shaped portion is formed to a fixed portion such as a vehicle body. Specifically, the piping is fixed to the vehicle body using a clamp, but if the binding force of the piping by the clamp is not sufficient, even if the piping is attached via the clamp, vibration under driving conditions may occur. Due to the temperature change, there was a risk that the piping would be displaced in the axial and rotational directions.

Further, when the pipe is long, a plurality of places of the pipe are attached by using clamps, but there is a problem that the work man-hours and the work time increase by individually fixing the plurality of clamps. Further, if an adhesive or a vibration absorbing member is used in the pipe mounting process, the pipe mounting structure and mounting method may be complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to firmly fix a pipe in the axial direction and the circumferential direction, and to fix the pipe simply. It is an object of the present invention to provide a possible pipe fixing structure and a pipe fixing method.

The present invention has a pipe fixing structure in which a pipe is fixed by a clamp, and the pipe has a spiral bellows portion having a bellows portion in a spiral shape and a portion of the pipe in the vicinity of the spiral bellows portion from the outer surface of the pipe. It is provided with a protruding portion, and has a spirally clamped groove on the inner surface of the insertion port of the clamp. It is characterized in that it is engaged with the clamp groove of the clamp.

Further, in the pipe fixing structure of the present invention, the pipe is characterized by having a plurality of the protrusions.

Further, the pipe fixing structure of the present invention is characterized in that the width of the protrusion in the axial direction is shorter than the width of the clamp groove.

Further, the pipe fixing structure of the present invention is characterized in that the spiral bellows portion is made of a material that is more easily deformed than other parts of the pipe.

Further, in the pipe fixing structure of the present invention, the bellows portion has valley portions recessed toward the inner surface and peak portions protruding toward the outer surface alternately along the axial direction, and the peak portions are formed. It is characterized in that it is composed of a material that is more easily deformed than the valley portion.

Further, in the pipe fixing structure of the present invention, the bellows portion has valley portions recessed toward the inner surface and peak portions protruding toward the outer surface alternately along the axial direction, and the valley portions are formed. It is characterized in that it is composed of a material that is more easily deformed than the mountain portion.

Further, in the pipe fixing structure of the present invention, the pipe has a plurality of the spiral bellows portions, and the plurality of spiral bellows portions are fixed to the vehicle body by the plurality of clamps.

Further, the present invention is a pipe fixing method for fixing a pipe using a clamp, in which a spiral bellows portion having a bellows portion in a spiral shape and a protruding portion that partially protrudes in the vicinity of the spiral bellows portion are provided. The step of preparing the provided pipe and preparing the clamp having a spirally formed clamp groove on the inner surface of the insertion port, and inserting the pipe into the insertion port of the clamp and inserting the pipe into the vicinity of the clamp. By the step of arranging the protrusion and increasing the pressure inside the pipe, the bellows portion of the spiral bellows portion is rotated and extended toward the clamp, and the protrusion of the pipe is extended toward the clamp. It is characterized by comprising a step that engages with the groove.

Further, the pipe fixing method of the present invention is characterized in that coolant is flowed through the pipe in the step of engaging with the clamp groove.

The present invention has a pipe fixing structure in which a pipe is fixed by a clamp, and the pipe has a spiral bellows portion having a bellows portion in a spiral shape and a portion of the pipe in the vicinity of the spiral bellows portion from the outer surface of the pipe. It is provided with a protruding portion, and has a spirally clamped groove on the inner surface of the insertion port of the clamp. It is characterized in that it is engaged with the clamp groove of the clamp. Therefore, by engaging the protrusion of the pipe with the clamp groove of the clamp, the clamp groove is formed in a spiral shape, so that careless displacement in the axial direction and the rotational direction of the pipe can be suppressed. can.

Further, in the pipe fixing structure of the present invention, the pipe is characterized by having a plurality of the protrusions. Therefore, since the plurality of protrusions engage with the clamp groove of the clamp, the pipe can be firmly fixed by the clamp.

Further, the pipe fixing structure of the present invention is characterized in that the width of the protrusion in the axial direction is shorter than the width of the clamp groove. Therefore, the protrusion can be easily inserted into the clamp groove and engaged.

Further, the pipe fixing structure of the present invention is characterized in that the spiral bellows portion is made of a material that is more easily deformed than other parts of the pipe. Therefore, when the spiral bellows portion of the pipe is extended in the axial direction, the amount of extension of the spiral bellows portion can be increased, and the protrusion of the pipe can be reliably inserted into the clamp groove of the clamp.

Further, in the pipe fixing structure of the present invention, the bellows portion has valley portions recessed toward the inner surface and peak portions protruding toward the outer surface alternately along the axial direction, and the peak portions are formed. It is characterized in that it is composed of a material that is more easily deformed than the valley portion. Therefore, the elongation amount of the spiral bellows portion can be lengthened, and the bellows portion can be easily molded.

Further, in the pipe fixing structure of the present invention, the bellows portion has valley portions recessed toward the inner surface and peak portions protruding toward the outer surface alternately along the axial direction, and the valley portions are formed. It is characterized in that it is composed of a material that is more easily deformed than the mountain portion. Therefore, the elongation amount of the spiral bellows portion can be lengthened, and further, since the mountain portion forming the outermost peripheral portion is made of a relatively hard material, the strength of the spiral bellows portion can be increased.

Further, in the pipe fixing structure of the present invention, the pipe has a plurality of the spiral bellows portions, and the plurality of spiral bellows portions are fixed to the vehicle body by the plurality of clamps. Therefore, the piping can be firmly fixed to the vehicle body. Further, when fixing the pipe, by increasing the internal pressure of the pipe, a plurality of bellows portions can be fixed to a plurality of clamps at once.

Further, the present invention is a pipe fixing method for fixing a pipe using a clamp, in which a spiral bellows portion having a bellows portion in a spiral shape and a protruding portion that partially protrudes in the vicinity of the spiral bellows portion are provided. The step of preparing the provided pipe and preparing the clamp having a spirally formed clamp groove on the inner surface of the insertion port, and inserting the pipe into the insertion port of the clamp and inserting the pipe into the vicinity of the clamp. By the step of arranging the protrusion and increasing the pressure inside the pipe, the bellows portion of the spiral bellows portion is rotated and extended toward the clamp, and the protrusion of the pipe is extended toward the clamp. It is characterized by comprising a step that engages with the groove. Therefore, with a simple operation of increasing the pressure inside the pipe, the bellows portion of the pipe can be rotated and extended along the axial direction, and the protrusion of the pipe can be engaged with the clamp groove of the clamp.

Further, the pipe fixing method of the present invention is characterized in that coolant is flowed through the pipe in the step of engaging with the clamp groove. Therefore, the pipe can be fixed to the clamp by a simple method of flowing coolant at a high temperature and high pressure inside the pipe.

It is a side view which shows the pipe fixing structure which concerns on one Embodiment of this invention. It is a figure which shows the pipe fixing structure which concerns on one Embodiment of this invention, (A) is the sectional view which shows the clamp, (B) is the side view which shows the pipe. It is a figure which shows the pipe fixing structure which concerns on one Embodiment of this invention, and is the figure which shows the case where the pipe fixing structure is applied to a vehicle. It is a figure which shows the pipe fixing structure which concerns on one Embodiment of this invention, (A) and (B) are sectional views of the pipe. It is a figure which shows the pipe fixing method which concerns on one Embodiment of this invention, (A) to (C) are sectional views which show the pipe fixing method sequentially.

Hereinafter, the pipe fixing structure 11 and the pipe fixing method according to the embodiment of the present invention will be described in detail with reference to the drawings. In the following description, in principle, the same code number will be used for the same member, and repeated description will be omitted.

The pipe fixing structure 11 will be described with reference to FIG. This figure is a side view showing a pipe fixing structure 11 for attaching a pipe 10 to a vehicle body 13 via a clamp 12.

In the pipe fixing structure 11 according to the present embodiment, a predetermined portion of the pipe 10 having the spiral bellows portion 14 is fixed to the lower side of the vehicle body 13 via a clamp 12 whose upper end is attached to the vehicle body 13.

The pipe 10 is a long pipe through which a fluid such as a gas or a liquid flows. As an example, the pipe 10 is arranged inside a vehicle 19 such as a passenger car, and a high-temperature fluid such as a coolant used for cooling the vehicle 19 circulates in the inside in a high-temperature and high-pressure state. The temperature of the coolant flowing through the pipe 10 is, for example, 50 ° C. or higher, and the internal pressure of the pipe 10 at that time is, for example, 0.1 MPa or higher.

The axial length of the pipe 10 is about several tens of cm to several m, the outer diameter of the pipe 10 is about several cm, and the thickness of the pipe 10 is about several mm. Polyamide or the like can be adopted as the material of the pipe 10. Further, as will be described later, the pipe 10 may be manufactured by two-color molding using a plurality of synthetic resins having different compositions. As the synthetic resin constituting the pipe 10, polyamide, polyphenylene sulfide, polyether, or the like can be adopted.

A spiral bellows portion 14 is formed in a part of the pipe 10 along the axial direction. The spiral bellows portion 14 is a portion in which a part of the pipe 10 is deformed in a bellows shape and a spiral shape. A spiral bellows portion 17 is formed in the spiral bellows portion 14. Here, by setting the inside of the pipe 10 to high temperature and high pressure, the state after the bellows portion 17 is extended along the axial direction is shown. The spiral bellows portion 14 is a portion for fitting the protrusion 16 of the pipe 10 into the clamp groove 18 of the clamp 12 in the fixing step of fixing the pipe 10. Such a function will be described later.

In the vicinity of the pipe 10, a protrusion 16 protruding from the outer surface of the pipe 10 is formed. Here, a plurality of protrusions 16 are formed at substantially equal intervals along the circumferential direction of the pipe 10. By forming the plurality of protrusions 16, the pipe 10 can be firmly fixed by the clamp 12 as described later. The protrusion 16 may be a resin piece fixed to the outer peripheral portion of the pipe 10, or may be formed by molding a part of the outer surface of the pipe 10 into a protrusion during injection molding. Here, a plurality of protrusions 16 may be formed along the axial direction, or only one may be formed.

The structure of the clamp 12 and the pipe 10 described above will be described in detail with reference to FIG. FIG. 2A is a cross-sectional view showing the clamp 12, and FIG. 2B is a side view showing the pipe 10.

With reference to FIG. 2A, the clamp 12 is a fixing member formed with an insertion port 15 penetrating in the left-right direction on the paper surface. As the material of the clamp 12, a synthetic resin material such as polyamide, polyphenylene sulfide, or polyacetal, or a metal such as iron, aluminum, or stainless steel can be adopted. Here, the pipe 10 penetrates the insertion port 15 of the clamp 12. The clamp groove 18 is formed by spirally forming an uneven shape on the inner wall of the insertion port 15. The minimum radius L10 of the insertion port 15 is about the same as or slightly longer than the outer diameter L20 of the straight portion 20 of the pipe 10 described later. By doing so, the straight portion 20 of the pipe 10 can be easily inserted into the insertion port 15 of the clamp 12. Further, at the time of insertion, the straight portion 20 of the pipe 10 can be smoothly rotated inside the insertion port 15.

With reference to FIG. 2B, the pipe 10 is formed of a spiral bellows portion 14 composed of a large number of bellows portions 17, and a straight portion 20 having a straight shape in which the spiral bellows portion 14 is not formed. A protrusion 16 is formed on the straight portion 20 as described above. The width L22 along the axial direction of the protrusion 16 is shorter than the width L12 of the clamp groove 18 shown in FIG. 2 (A). Further, the protrusion height L21 of the protrusion 16 is shorter than the depth L11 of the clamp groove 18 shown in FIG. 2 (A). Therefore, when the pipe 10 is fixed to the clamp 12, the protrusion 16 of the pipe 10 can be smoothly moved along the clamp groove 18 of the clamp 12.

Here, the direction in which the bellows portion 17 constituting the spiral bellows portion 14 of the pipe 10 draws a spiral and the direction in which the clamp groove 18 of the clamp 12 draws a spiral are opposite to each other. For example, when the above-mentioned pipe 10 and clamp 12 are viewed from the left along the axial direction on a paper surface, the bellows portion 17 of the pipe 10 spirals counterclockwise, and the clamp groove 18 of the clamp 12 rotates clockwise. Is drawing a spiral. By doing so, in the step of fixing the pipe 10 to the clamp 12, when the bellows portion 17 of the spiral bellows portion 14 extends, the straight portion 20 on which the protrusion 16 is formed is rotated clockwise. , The protrusion 16 can be inserted into the clamp groove 18 of the clamp 12.

Further, the inclination angle at which the bellows portion 17 of the pipe 10 is inclined from the axial direction and the inclination angle at which the clamp groove 18 of the clamp 12 is inclined from the axial direction are substantially the same. By doing so, when fixing the pipe 10 to the clamp 12, the protrusion 16 of the pipe 10 can be easily inserted into the clamp groove 18 of the clamp 12.

Further, the distance L23 between the bellows portions 17 of the pipe 10 and the distance L12 between the clamp grooves 18 of the clamp groove 18 are substantially the same. As a result, the protrusion 16 of the pipe 10 can be easily inserted into the clamp groove 18 of the clamp 12 in the same manner as described above.

A case where the above-mentioned pipe fixing structure 11 is applied to the vehicle 19 will be described with reference to FIG. This figure shows, for example, a case where a vehicle 19 which is a passenger car is viewed from below. The pipe 10 is arranged near the bottom surface of the vehicle body 13 of the vehicle 19, and cooling coolant flows inside the pipe 10. The pipe 10 extends continuously from the vicinity of the front end to the vicinity of the rear end of the vehicle 19 while being bent. A plurality of locations of the pipe 10 are fixed to the vehicle body 13 via the clamp 12. Since the pipe fixing structure 11 of the present embodiment described above firmly fixes the pipe 10 in the axial direction and the circumferential direction, the pipe 10 can be firmly fixed to the vehicle body 13.

The spiral bellows portion 14 of the pipe 10 will be described in detail with reference to FIG. 4 (A) and 4 (B) are cross-sectional views showing a pipe 10 cut along the axial direction.

With reference to FIG. 4A, the spiral bellows portion 14 formed in the middle portion of the pipe 10 alternately has a valley portion 21 that is recessed toward the inner surface and a mountain portion 22 that protrudes toward the outer surface. doing. The valley portion 21 and the mountain portion 22 constitute the bellows portion 17 described above. The valley portion 21 and the mountain portion 22 are spirally formed along the axial direction of the pipe 10. Further, the pipe 10 is composed of a straight portion 20 and a spiral bellows portion 14, but the straight portion 20 and the spiral bellows portion 14 may be formed of the same type of synthetic resin or may be composed of different types of synthetic resins. May be done.

Here, the spiral bellows portion 14 is made of a material that is more easily deformed than the straight portion 20. By doing so, the spiral bellows portion 14 is easily deformed in the pipe fixing step, and by applying an internal pressure to the pipe 10, the spiral bellows portion 14 is easily extended along the axial direction and rotated. Can be made to. As a specific configuration for facilitating the deformation of the spiral bellows portion 14, the thickness L24 of the spiral bellows portion 14 is made thinner than the thickness L23 of the straight portion 20. Further, in order to make the spiral bellows portion 14 easily deformed, a synthetic resin material that is softer than the synthetic resin material that constitutes the straight portion 20 can be adopted as the synthetic resin material that constitutes the spiral bellows portion 14. For example, a relatively soft polyether or the like is used as the synthetic resin material constituting the spiral bellows portion 14, and a relatively hard polyphenylene sulfide or the like is used as the synthetic resin material constituting the straight portion 20. Further, by adopting a resin material softer than the straight portion 20 for the spiral bellows portion 14 and making the spiral bellows portion 14 relatively thin, the above-mentioned effect can be made remarkable.

Other configurations of the spiral bellows portion 14 will be described with reference to FIG. 4 (B). Here, the valley portion 21 and the valley portion 21 of the spiral bellows portion 14 are made of different resin materials. The molding method for forming such a spiral bellows portion 14 is generally called two-color molding. Here, the difference in outer diameter between the mountain portion 22 and the valley portion 21 is, for example, about 3.0 mm. Further, the peaks 22 and the valleys 21 have a length of, for example, 2.0 mm or more and 3.0 mm or less, and are alternately held along the axial direction.

Here, the mountain portion 22 can be made of a material that is more easily deformed than the valley portion 21. For example, the thickness L26 of the mountain portion 22 is made thinner than the thickness L25 of the mountain portion 22. By doing so, when the spiral bellows portion 14 is formed by blow molding, the thin mountain portion 22 can be easily formed. Further, as the synthetic resin material constituting the mountain portion 22, a synthetic resin material softer than the synthetic resin material constituting the valley portion 21 can be adopted. For example, a relatively soft polyether or the like is used as the synthetic resin material constituting the mountain portion 22, and a relatively hard polyphenylene sulfide or the like is used as the synthetic resin material forming the valley portion 21. Further, by adopting a resin material softer than the valley portion 21 for the mountain portion 22 and making the mountain portion 22 relatively thin, the above-mentioned effect can be made remarkable.

Further, contrary to the above, the valley portion 21 can be made of a material that is more easily deformed than the mountain portion 22. For example, the thickness L25 of the valley portion 21 is made thinner than the thickness L26 of the mountain portion 22. In other words, the mountain portion 22 is formed relatively thick. By doing so, the rigidity of the mountain portion 22 arranged on the outer peripheral portion can be increased, and the strength of the spiral bellows portion 14 can be increased. Further, as the synthetic resin material constituting the valley portion 21, a synthetic resin material softer than the synthetic resin material constituting the mountain portion 22 can be adopted. For example, a relatively soft polyether or the like is used as the synthetic resin material constituting the valley portion 21, and a relatively hard polyphenylene sulfide or the like is adopted as the synthetic resin material constituting the mountain portion 22. Further, by adopting a resin material relatively softer than the mountain portion 22 for the valley portion 21 and making the valley portion 21 relatively thin, the above-mentioned effect can be made remarkable.

Based on FIG. 5, a pipe fixing method for fixing the pipe 10 using the clamp 12 will be described with reference to the above-mentioned drawings. Each figure of FIG. 5 is a side sectional view showing a method of fixing a pipe in sequence.

First, the pipe 10 and the clamp groove 18 are prepared with reference to FIG. 5 (A). The configurations of the pipe 10 and the clamp groove 18 are as described above. In this step, since no internal pressure is applied to the pipe 10, each bellows portion 17 constituting the spiral bellows portion 14 is in close contact with the pipe 10. Therefore, the length L30 along the axial direction of the spiral bellows portion 14 is relatively short. Further, although a protrusion 16 is formed in the vicinity of the spiral bellows portion 14 of the pipe 10, the protrusion 16 is not built in the insertion port 15 of the clamp groove 18. Although not shown here, the right portion of the pipe 10 is actually inserted into the insertion port 15 of the clamp groove 18.

Next, an internal pressure is applied to the pipe 10 with reference to FIG. 5 (B). Specifically, after sealing both ends of the pipe 10, the inside of the pipe 10 is brought into a state of higher pressure than the external atmosphere. Preferably, in order to promote the stretching of the spiral bellows portion 14, the inside of the pipe 10 is set to a high temperature and high pressure state where the temperature and pressure are higher than the external atmosphere. For example, a high-temperature and high-pressure coolant is flowed to achieve high-temperature and high-pressure.

In this way, the bellows portions 17 constituting the spiral bellows portion 14 are deformed so as to extend. Specifically, each bellows portion 17 spreads in a direction perpendicular to the spiral direction in which the bellows portion 17 extends. In FIG. 5B, the direction in which the bellows portion 17 spreads is indicated by a hatched arrow.

Here, as described above, when the pipe 10 is viewed from the left side on the paper surface along the axial direction, the bellows portion 17 of the spiral bellows portion 14 is formed so as to be spiral in a counterclockwise direction. Therefore, when the inside of the pipe 10 is in a high temperature and high pressure state, the bellows portions 17 constituting the spiral bellows portion 14 are extended to each other, and the pipe 10 on the right side of the spiral bellows portion 14 is, on the contrary, a clock. Rotate around. Further, by extending the bellows portions 17 constituting the spiral bellows portion 14, the width L30 of the spiral bellows portion 14 becomes longer than that shown in FIG. 5 (A). By doing so, the protrusion 16 formed on the straight portion 20 of the pipe 10 moves toward the right while drawing a spiral trajectory.

By continuing to apply pressure to the inside of the pipe 10 with reference to FIG. 5 (C), the bellows portions 17 constituting the spiral bellows portion 14 are further extended, and the portion to the right of the spiral bellows portion 14 is further extended. The pipe 10 moves to the right while rotating clockwise. When this happens, the protrusion 16 formed on the outer peripheral portion of the pipe 10 also moves while drawing a spiral trajectory clockwise. As described above, the inner wall of the clamp 12 is formed with a clamp groove 18 that spirals clockwise when viewed from the left in the axial direction. Therefore, the protrusion 16 advances to the right while drawing a spiral along the clamp groove 18. Here, in order to move the protrusion 16 more reliably, the pipe 10 may be fixed in the circumferential direction and the axial direction on the left side of the spiral bellows portion 14 on the paper surface.

When the deformation of the spiral bellows portion 14 due to the above pressurization is completed, for example, the pressure applied to the pipe 10 is released. That is, the inside of the pipe 10 is set to atmospheric pressure. When high temperature and high pressure are applied to the pipe 10, the inside of the pipe 10 is brought into an atmospheric pressure and a normal temperature state. By the above steps, the bellows portions 17 constituting the spiral bellows portion 14 are stretched, and this deformation is plastic deformation (permanent deformation). Therefore, even if the pressure or heating applied to the pipe 10 is released, the bellows portions 17 remain stretched, and the spiral bellows portion 14 does not return to the state before pressurization. Therefore, the protrusion 16 of the pipe 10 is held in a state of being engaged with the clamp groove 18 of the clamp 12.

By doing so, the pipe 10 is fixed to the clamp 12 at the position where the protrusion 16 is formed, both in the axial direction and in the circumferential direction. Therefore, even if vibration or thermal expansion acts on the pipe 10 or the clamp 12 after fixing, the pipe 10 does not rotate unnecessarily, and the pipe 10 does not move unnecessarily in the axial direction. Therefore, it is possible to prevent the piping 10 from interfering with the peripheral parts of the vehicle body 13 in the traveling state of the vehicle 19.

Further, in the present embodiment, the pipe 10 is fixed by a simple configuration in which the protrusion 16 having the outer surface of the pipe 10 partially projected is engaged with the clamp groove 18 of the clamp 12. Therefore, since a friction enhancing member such as rubber or an adhesive used in a general fixing structure is not required, the fixing structure and fixing method of the pipe 10 can be simplified.

Further, as shown in FIG. 3, when the pipe 10 having a length of several meters is fixed to the vehicle body 13 via the plurality of clamps 12, the pipe 10 is first inserted into the plurality of clamps 12. After that, a coolant is flowed inside the pipe 10 to realize a high temperature and high pressure state. In this way, the spiral bellows portion 14 formed in the vicinity of the individual clamps 12 is deformed as described above, and the protrusions 16 engage with the clamp grooves 18 of the individual clamps 12. After that, the pressure applied to the pipe 10 is released. Therefore, since the individual protrusions 16 can be engaged with the individual clamps 12 by one pressurizing operation, the piping fixing operation can be simplified.

Although the embodiments of the present invention have been shown above, the present invention is not limited to the above embodiments.

10 Piping 11 Piping fixing structure 12 Clamp 13 Body 14 Spiral bellows 15 Insertion port 16 Protrusion 17 Bellows 18 Clamp groove 19 Vehicle 20 Straight 21 Tani 22 Mountain

Claims (9)

It is a pipe fixing structure in which the pipe is fixed by a clamp.
The pipe includes a spiral bellows portion having a bellows portion in a spiral shape and a protrusion portion that partially protrudes from the outer surface of the pipe in the vicinity of the spiral bellows portion.
A clamp groove is spirally provided on the inner surface of the insertion port of the clamp.
The bellows portion of the spiral bellows portion is extended to each other.
The pipe fixing structure is characterized in that the protrusion is engaged with the clamp groove of the clamp. The pipe fixing structure according to claim 1, wherein the pipe has a plurality of the protrusions. The pipe fixing structure according to claim 1 or 2, wherein the width of the protrusion in the axial direction is shorter than the width of the clamp groove. The pipe fixing structure according to any one of claims 1 to 3, wherein the spiral bellows portion is made of a material that is more easily deformed than other parts of the pipe. The bellows portion alternately has valleys that are recessed toward the inner surface and peaks that protrude toward the outer surface along the axial direction.
The pipe fixing structure according to any one of claims 1 to 3, wherein the peak portion is made of a material that is more easily deformed than the valley portion. The bellows portion alternately has valleys that are recessed toward the inner surface and peaks that protrude toward the outer surface along the axial direction.
The pipe fixing structure according to any one of claims 1 to 3, wherein the valley portion is made of a material that is more easily deformed than the mountain portion. The pipe according to any one of claims 1 to 6, wherein the pipe has a plurality of spiral bellows portions, and the plurality of spiral bellows portions are fixed to the vehicle body by the plurality of clamps. Fixed structure. It is a pipe fixing method that fixes the pipe using a clamp.
The pipe provided with a spiral bellows portion having a bellows portion in a spiral shape and a protrusion portion that partially protrudes in the vicinity of the spiral bellows portion is prepared, and a clamp groove is spirally formed on the inner surface of the insertion port. And the step of preparing the clamp in which the helix was formed
A step of inserting the pipe into the insertion port of the clamp and arranging the protrusion in the vicinity of the clamp.
By increasing the pressure inside the pipe, the bellows portion of the spiral bellows portion is rotated and extended toward the clamp, and the protrusion of the pipe is engaged with the clamp groove of the clamp. A method of fixing a pipe, which comprises the above. In the step of engaging the clamp groove,
The pipe fixing method according to claim 8, wherein coolant is flowed through the pipe.

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