JP2001165352A - Pipe holder for absorbing vibration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe holder which can absorb vibration when attached to various pipes in a vehicle, a ship, a construction machine and so on, and excels in the vibration damping, whose material is superior in the pipe-holding capability to prevent pipes from dropping off, is made of a single member, and can be produced easily. SOLUTION: The fixed main body 3 consists of the foundation bed 4, the several fixed projections 5 on the bed, and the concave parts 6 to hold pipes 2 between those projections 5. The fixed main body 3 is composed of the polyester resin of hardness D 45 to 55, ethylene-α olefin copolymer of hardness A 65 to 85, and blowing agent, and mixed in the proportions of 1:0.5 to 1.5:0.04 to 0.12 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for various mechanical devices such as vehicles, ships, construction machines, etc., and in particular, relatively small-diameter pipes such as fuel pipes, brake pipes, clutch pipes and cable pipes for automobiles. Are installed and fixed on the underfloor panel, front panel, etc. of the vehicle body, and absorb the vibration of the piping caused by the fuel circulation and the rotation of the engine, and the vibration transmitted from the road surface to prevent problems such as noise. And a vibration absorbing holder for piping.

[0002]

2. Description of the Related Art Conventionally, fuel distribution, engine and fuel piping, such as fuel piping, brake piping, clutch piping, cable piping, etc., installed and fixed on various mechanical devices such as vehicles, ships, construction machines and the like, especially on the body of automobiles, etc. In order to prevent vibration and noise generated in each pipe due to the rotation of
The invention described in JP-A-11-132363,
Invention described in JP-A-11-108250, JP-A-11-23
There is a holder as disclosed in Japanese Patent No. 0414. These holders are formed by combining a hard resin excellent in sandwiching property of the pipe and a soft resin excellent in vibration absorbing property of the pipe. Also, JP-A-11-13942
As described in Japanese Patent Application Laid-Open Publication No. H10-205, there is an apparatus in which vibration can be absorbed by sandwiching a pipe with an elastically deformable connecting arm. Also, it is not for automobiles, but it is a patent that covers piping with a material that combines a hard material such as metal and a soft material such as foam as a material that absorbs vibration of plumbing pipes of buildings and air conditioning equipment piping. There is also an invention described in Japanese Patent No. 2851836.

[0003]

However, since the conventional holder as described above uses two types of members made of a hard material and a soft material, it is necessary to perform molding and assembling work twice. Yes, it took time and steps to manufacture the holder. In addition, since a hard material is used in a contact portion with each pipe, a contact noise is generated, and an effect of preventing vibration transmission between adjacent pipes or a connection destination is low.

[0004] There is also a holder made of a soft elastic material such as rubber. Such a holder can favorably absorb and attenuate vibrations due to its elastic force, and the molding process is easy. However, when the clamping force of the pipe is low and strong vibrations or the like are received, the pipe is likely to fall off the holder or to be misaligned.

The present invention has been made to solve the above-mentioned problems, and is intended to solve various problems such as a vehicle, a ship, a construction machine, etc., and particularly to a vehicle, such as a fuel pipe, a brake pipe, a clutch pipe, a cable pipe, and the like. An object of the present invention is to obtain a holder having excellent soundproofing and vibration-proofing effects for various other pipes and excellent pinching properties of the pipes. Then, the vibration of the pipe due to the flow of the fuel, the rotation of the engine, and the propagation of the vibration from the road surface is satisfactorily absorbed and attenuated, thereby preventing adverse effects on the pipe and generation of noise. Furthermore, it is possible to prevent the transmission of vibration to other pipes that are held together by pipe connection destinations and holding devices, and the transmission of vibration to these pipes from these connection destinations and other pipes. is there. Then, it is intended to obtain a material capable of forming such a holder having excellent soundproofing / vibrationproofing effects and excellent pipe clamping properties in a simple manufacturing process.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a plurality of fixed projections are formed on the surface of a base portion, and a pipe recess for mounting a pipe is formed between the fixed projections. In the thing which provided and formed the fixed main body, the fixed main body was
Polyethylene resin with hardness D45-55, hardness A65-8
5, an ethylene-α-olefin copolymer and a foaming agent are mixed to form a mixture.
1.5, with the foaming agent being 0.04-0.12.

The fixing body may be formed by mixing a polyethylene resin having a hardness of D48, an ethylene-α-olefin copolymer having a hardness of A83, and a foaming agent.

[0008] Further, the fixing body is composed of a mixture of polyethylene resin, ethylene-α-olefin copolymer and a foaming agent.
For the polyethylene resin 1, the ethylene-α-olefin copolymer may be 1 and the foaming agent may be 0.08.

Further, the fixing projection may project an engaging piece in a pipe recess direction, and this engaging piece may be able to be engaged with the pipe recess in contact with a surface of the pipe in a drawing direction.

[0010] Further, a hollow portion may be provided in the base portion of the fixed body by hollowing out the space between adjacent pipe concave portions in parallel with the pipe concave portion.

Further, a rib may be provided in the center of the hollow portion.

[0012]

The present invention is constructed as described above. By forming a mixture of a polyethylene (PE) resin, an ethylene-α-olefin copolymer and a foaming agent, the holder of the present invention has excellent soundproofing.・ It has the flexibility to exhibit the anti-vibration effect,
It excels in vibration absorption of the pipe itself due to fuel distribution, vibration transmitted from the road surface, engine, etc., and
This prevents vibration from propagating to other pipes connected to the same holder. In addition to the excellent vibration absorbing properties, the holder of the present invention also has good holding force and rigidity without causing each pipe to fall off or being displaced by vibration.

[0013] That is, by blending the PE resin, the holder is excellent in pinchability of the pipe, and also excellent in impact resistance and chemical resistance at low temperature, and is a light and inexpensive product. On the other hand, the PE resin is inferior in heat resistance, easily softens and burns, and is inferior in durability such as stress cracking resistance (tear) and creep resistance (strain). In addition, since the frictional resistance is low, rotation and movement of the pipe are likely to occur.

Therefore, by mixing this PE resin with an ethylene-α-olefin copolymer having good affinity,
Since the heat resistance and flexibility are improved, it is possible to form a durable holder having excellent softening and burning prevention effects and tear / strain prevention effects. Furthermore, since the coefficient of friction increases due to the viscosity of the forming material, the holder is closely attached to the outer periphery of the pipe, and rotation and movement of the pipe, dropping from the holder, and the like can be prevented well. In addition, since the resin mixture is swollen with a foaming agent at the time of molding the holder, the presence of air bubbles inside the holder makes it possible to maintain the characteristics excellent in the effect of absorbing and damping vibrations. And a holder forming material having good clamping force and rigidity.

The PE resin has a Shore hardness of D45.
, And the ethylene-α-olefin copolymer preferably has a JIS hardness of A65 to 85. That is, when the hardness of the PE resin is softer than D45, the pinching force of the pipe is reduced, so that the pipe vibrates due to the rotation of the engine or the pressure at the time of fuel flow, or is transmitted from the tire from the road surface through each panel. When the brake pipe or the clutch pipe vibrates due to the vibration, the pipe is likely to fall off from the holder or to be easily displaced. On the other hand, if the hardness is higher than D55, the flexibility of the holder-forming material is reduced, resulting in poor vibration absorption / damping properties.

If the hardness of the ethylene-α-olefin copolymer is lower than A65, the flexibility of the holder forming material becomes too high, and the holding force of the pipe is reduced. Also,
If the hardness is higher than A85, the flexibility of the holder forming material is reduced, and the vibration absorbing / damping properties are poor.

The material is preferably a PE resin having a Shore hardness of D48 and ethylene-α having a JIS hardness of A83.
An olefin copolymer is used.

Further, the fixing body is
The ethylene-α-olefin copolymer is formed at a mixing ratio of 0.5 to 1.5 and the foaming agent at 0.04 to 0.12.
That is, when the mixing ratio of the ethylene-α-olefin copolymer to the PE resin 1 is less than 0.5, the heat resistance and durability are not significantly improved. Also, ethylene-
If the mixing ratio of the α-olefin copolymer is more than 1.5, the holding tool is too soft, the holding force of the pipe is reduced, and the pipe is easily dropped from the holding tool or misaligned.

On the other hand, if the mixing ratio of the foaming agent is less than 0.04 with respect to the PE resin 1, the foam content of the holder forming material is small, and the swelling of each resin is not performed well. Become. Therefore, it is not possible to obtain a hardness having a good holding force and rigidity, and the vibration absorption / damping properties are also poor. When the mixing ratio of the foaming agent is more than 0.12,
The holder-forming material contains a large amount of air bubbles. As a result, the composition becomes excessively hardened, resulting in poor absorption and attenuation.

The above material is desirably formed at a mixing ratio of 1 ethylene-α-olefin copolymer and 0.08 blowing agent to 1 PE resin.

Further, as the foaming agent for swelling the resin, a conventionally known appropriate one can be used. For example, azodicarbonamide (ADCA), barium azodicarboxylate (Ba)
/ AC), nitroso compounds such as N, N'-dinitrosopentamethylenetetramine (DPT), 4,4'-oxybis (OBSH), hydrazodicarbonamide (HDC
A) and other hydrazine derivatives such as sodium bicarbonate (NaH
Bicarbonates such as CO ₃ ) and others can be used.

A vehicle, a ship,
Piping for various machinery and equipment such as construction equipment is installed. For example, in the case of a car, this pipe is a fume main pipe that supplies fuel from the fuel tank to the engine room, and returns excess fuel from the engine to the fuel tank. Fuel return piping, evaporative piping for adsorbing fuel vapor in the fuel tank to the canister in the engine room, AB
S-brake pipes, clutch pipes, cable pipes, and the like are listed. Then, in order to attach such a pipe to the holder, the pipe is arranged so as to face a pipe recess formed by a fixed projection projecting from the fixed body. Then, by pressing the pipe in the direction of the fixed body or, in some cases, by pressing the fixed body in the opposite direction, the pipe is inserted into the pipe recess, and this pipe and the pipe recess engage. By this engagement, the mounting of the pipe to the holder is completed.

As described above, the pipe can be easily mounted on the holder, and even if the fixing projection of the holder is largely deformed during the mounting operation, its good flexibility is achieved after the mounting is completed. Since the shape is restored by the rigidity and the rigidity, it is possible to mount the pipe satisfactorily without causing unnatural deformation of the holder. And, after mounting, since it has appropriate hardness and viscosity that can squeeze the pipes well as described above, the pipes fall off from the holder and displace, and the propagation of vibration between adjacent pipes,
Prevents the propagation of vibration from the engine and road surface. In addition, the holder has an excellent effect of preventing the holder from being deformed by vibration or stimulation, and can maintain stable installation of the pipe when each device is used.

In addition, the vibration of the pipe due to the flow of the fuel, the vibration transmitted from the engine block, the brake and other pipe contacts, the vibration transmitted from the adjacent pipe, or the tire transmitted from the road surface through each panel through each panel. Vibration is favorably absorbed and attenuated by a holder made of a mixed material of a PE resin, an ethylene-α-olefin copolymer and a foaming agent and having excellent vibration absorption properties. Therefore, vibration that adversely affects the function of the pipe does not occur in the pipe, and noise caused by the vibration can be prevented well. In addition, it can prevent resonance and vibration propagation between adjacent pipes, and also prevent propagation of vibration to the engine room, brakes, clutches, and other pipe contact points. Can be. In addition, even if the pipe vibrates, it does not easily fall off the holder or displace, so that the holder can maintain excellent vibration absorption and damping properties.

Further, the fixing projection of the holder may be formed so that an engaging piece protrudes in the direction of the concave portion of the pipe, and this engaging piece is brought into contact with the surface of the pipe in the drawing direction so as to be engageable. When the pipe is to be mounted on such a holder, the pipe hits an engagement piece projecting into the pipe recess. However, the engaging piece is pressed against the outer surface of the pipe and elastically deforms to expand the insertion path, so that the pipe can easily be engaged with the concave portion of the pipe.

When the engagement of the pipe with the pipe recess is completed, the engagement piece is elastically restored, and the tip abuts on and engages with the surface of the pipe in the pull-out direction. Fixed. Therefore, the effect of preventing the pipe from dropping from the holder and the positional deviation is improved.

If the base portion of the fixed body is hollowed out between adjacent pipe recesses in parallel with the pipe recess, the deforming force of the fixed body and the pipe recess is increased. Therefore, when the pipe is mounted on the holder, the fixed body is flexibly deformed and the inner diameter of the pipe recess is expanded, so that the pipe can be smoothly engaged with the pipe recess with a small insertion force. . When this engagement is completed, the hollow portion is elastically restored, the shape of the fixed body is restored, and the pipe is stably clamped by the pipe recess. In addition, the work of removing the pipe from the holder is also performed by the flexible deformation force of the fixed body.
It can be done easily. Further, even if the outer diameter of the pipe is slightly larger than the inner diameter of the pipe recess, this hollow portion is deformed and the inner diameter of the pipe recess is adjusted, so that some dimensional error can be absorbed, Mounting is possible.

Further, by providing the hollow portion as described above, since the deformation force of the fixed main body is increased, when the strong vibration or the like is received, the retainer is warped or bent so as to impair the fitting property of the pipe. There is a fear. Therefore, if a rib is provided at the center of the hollow portion, the rigidity and the shape restoring force of the fixed main body are increased while maintaining the flexibility for facilitating the attachment and detachment of the pipe, and the fixed main body is prevented from warping or bending. It is possible to maintain good attachment to the holder.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to an automobile. Is what it is. And this holder (1)
Fuel main pipe for supplying fuel from the fuel tank to the engine room, fuel return pipe for returning surplus fuel from the engine to the fuel tank, evaporative pipe for absorbing fuel vapor in the fuel tank to the canister in the engine room, ABS A plurality of brake pipes, clutch pipes, cable pipes, and other pipes (2) are mounted, and each pipe (2) is disposed and fixed to the underfloor panel, the front panel, and the like.

As shown in FIG. 1, the holder (1) has a plurality of fixing projections (5) formed on the surface of a plate-like base (4) of the fixing body (3). Thus, a pipe recess (6) for engaging the pipe (2) is formed between the adjacent fixed projections (5). The inner peripheral surface of the pipe recess (6) is formed in an arc shape so as to be able to adhere to the outer peripheral surface of the pipe (2).
Further, the fixed body (3) may be provided with a plurality of pipe recesses (6) having the same inner diameter, but in this embodiment, FIG.
As shown in the figure, the outer diameter is 8.0mm, 6.35mm, 6.35mm, 6.3 from the left side
6 pipes (2) of 5mm, 4.76mm, 4.76mm can be engaged,
Pipe recesses (6) having different inner diameters are provided.

The fixed main body (3) is provided with an engagement piece (7) tapered from the tip of the fixed projection (5) in the direction of the pipe recess (6).
Are projected one or two. And this engagement piece
The tip of (7) is made to butt and engage with the surface in the withdrawal direction of the pipe (2) engaged with the pipe recess (6) from two directions. In addition, in the base portion (4) of the fixed body (3), a space between the adjacent pipe recesses (6) is hollowed out in parallel with the pipe recess (6).
A hollow portion (8) is provided. The hollow portion (8) allows the fixed body (3) to be flexibly deformable in the expanding and contracting directions of the pipe recess (6). Further, as shown in FIG. 2, a rib (10) is provided at the center of the hollow portion (8) to enhance the shape resilience of the hollow portion (8). As a result, the holder
Fixing body (3) when pipe (2) is mounted on (1) and after mounting
This prevents unnatural warping or bending of the holder (1), and enhances the mountability and durability of the holder (1).

The holder (1) is provided with the pipe (2) as described above.
In addition to facilitating attachment and detachment of the pipe, it is excellent in pinchability such that the pipe (2) does not easily fall off even when stimulated by vibration or the like, and has excellent shape retention without warpage or distortion. Need to be Further, it is necessary to form the holder (1) by an easy process and method, as well as to form the pipe (2) so as to absorb vibration and noise of the pipe well and to have a damping property capable of damping. is there.

In order to satisfy the above conditions, in this embodiment, the fixing body (3) is formed by mixing a PE resin having a hardness of D48, an ethylene-α-olefin copolymer having a hardness of A83, and a foaming agent. In addition, the mixing ratio of each material is such that the ethylene-α-olefin copolymer is 1 and the foaming agent is 0.08 with respect to 1 PE resin. In addition, since a mold is formed using these mixed materials and a plurality of types of members are not combined, man-hours and time for manufacturing the holder (1) can be reduced, and easy manufacturing can be achieved.

Then, the holder (1) configured as described above.
In order to mount a plurality of pipes (2) having different outer diameters, corresponding pipes (2) are arranged facing pipe recesses (6) of the fixed body (3). Next, pipe (2) in the direction of the fixed body (3)
Is pressed, the pipe (2) is inserted into the pipe recess (6). Due to this insertion, the engaging piece (7) protruding into the pipe recess (6) is pressed against the outer surface of the pipe (2), and is elastically deformed in the expanding direction of the insertion path. In addition, expansion of this insertion path
It is also performed flexibly by deforming the hollow portions (8) provided on both sides of the pipe recess (6). However, there is no rib in the hollow part (8).
Since (10) is provided, even if the hollow part (8) is greatly deformed at the time of attaching and detaching the pipe (2), it is immediately restored to the original shape,
It is possible to prevent the fixed main body (3) from warping or bending.

Even if the outer diameter of the pipe (2) is slightly larger than that of the pipe recess (6), the hollow part (8) shrinks and deforms and the inner peripheral surface of the pipe recess (6) also expands. It elastically deforms in the opening direction and expands the inner diameter of the pipe recess (6). Therefore, it is possible to eliminate some dimensional errors and to easily engage. In addition, since the dimensional error can be absorbed in this way, a slight error may occur between the outer diameter of the pipe (2) and the holder (1), so that the holder (1) can be easily manufactured.

After this engagement, the fixed projection (5) is restored, and the inner peripheral surface of the pipe recess (6) is tightly clamped to the outer circumference of the pipe (2) in an arc shape. Further, the engagement piece (7) is restored and comes into contact with the surface of the pipe (2) in the pipe recess (6) in the extraction direction, and the pipe (2) is securely engaged in the pipe recess (6). Then, the fitting of the pipe (2) to the holder (1) is completed by engaging the pipes (2) corresponding to all the pipe recesses (6). And, due to the excellent holding force of the pipe (2) by the pipe recess (6), the mounting stability of the holder (1) is enhanced, and the pipe (2) after mounting can be prevented from falling off and misaligned. .

When the pipe (2) vibrates due to vibrations caused by fuel circulation or engine rotation, vibration transmitted from the tire through the panels through the panels, vibration transmitted from the contact of the pipe (2), and the like, Holder made of mixed material of PE resin, ethylene-α-olefin copolymer and foaming agent (1)
However, since this vibration is well absorbed, the vibration of the pipe (2) is attenuated. Therefore, noise and the like can be effectively prevented, and the function of distributing fuel, oil, steam, and the like in the pipe (2), and the function of the pipe (2) for brake and clutch operation, etc. are obstructed. There is no. Also, adjacent piping
(2) Mutual transmission of vibrations and propagation of vibrations to the connection destination of the pipe (2) can be prevented, and these functions are not impaired.

In order to verify the holding performance of the pipe (2) and the performance of absorbing and damping the pipe (2) in the holding tool (1) formed as described above, the pipe pulling force and insertion as shown below are used. A force measurement experiment and an anti-vibration performance experiment were performed. In addition, two similar experiments were performed on a conventional holder formed of 100 wt% of PE resin in the same shape as the holder (1) of the present embodiment. Further, as comparative examples, about five kinds of holders formed by changing a mixing ratio or hardness of a PE resin, an ethylene-α-olefin copolymer, and a foaming agent, and two kinds of elastomer holders having different hardnesses, A similar measurement experiment was performed. Table 1 shows the forming materials of each holder (1) and the mixing ratio thereof.

[0039]

[Table 1]

Experiment for Measuring Pipe Pulling / Inserting Force With respect to each of the holders (1), an experiment for measuring pipe removing / inserting force was performed. The method is as follows. Fix both ends of the fixed body (3) with appropriate fixing tools, and fit the pipe (2) with an outer diameter of 6.35 mm and a wall thickness of 0.7 mm in one of the pipe recesses (6) for 6.35 mm inner diameter. The double-walled steel pipe is attached. And this pipe,
The tube was pulled out from the vertical direction, and its pulling force was measured. The tube was again inserted into the pipe recess (6), and the insertion force was measured. Table 2 shows the load (Newton) applied to the pipe when the pipe was pulled out and inserted.

[0041]

[Table 2]

Next, a vibration isolation performance experiment was performed on the holder (1) shown in Table 1 above. First, as shown in FIG. 4, one of the pipe recesses (6) of the holder (1) to be tested has an outer diameter 6.35 for vibration input.
Attach a pipe (11) of mm. A pipe (12) having an outer diameter of 6.35 mm is mounted in the pipe recess (6) adjacent to the pipe, and is used for detecting vibration transmitted from the pipe (11) via the holder (1). Pipes (13) having outer diameters of 4.76, 4.76, 6.35, and 8.0 mm are attached to the remaining four pipe recesses (6). Next, in this experiment, one end of the input pipe (11) was
It is connected to a vibration tester (16) that generates and transmits vibration.
Attach both ends of the vibration detection pipe (12) to the test jig.
Fix each to (14). This vibration detection pipe (12)
By mounting an acceleration sensor (15), the magnitude of vibration transmitted from the input pipe (11) to the vibration detection pipe (12) via the holder (1) is measured as acceleration. .

In the above apparatus, the following vibration is applied from the vibration tester (16) to the input pipe (11). Input waveform: Sine wave (excitation direction: up and down) Input amplitude: 0.1mmP-P constant Excitation frequency: 50, 75, 100, 125, 150, 175Hz Input acceleration: 4.9, 11.1, 19.7, 30.8, 44.4, 60.4m / s ²

Then, the vibration transmitted from the input pipe (11) to the vibration detecting pipe (12) via the holder (1) is measured by the acceleration sensor (15). The measurement results are shown in Table 3 below, and the data in Table 3 is shown in a line graph in FIG.

[0045]

[Table 3]

From the results of Tables 2 and 3 above, the holders of the conventional example and the comparative examples 1 to 5 are excellent in the pinchability of the pipe (2) since the holding force and the insertion force are large. However, a large impact is exerted on the pipe (2) when the pipe (2) is attached or detached, and the impact may cause the pipe (2) to be separated from the connection destination. In addition, since the anti-vibration property is inferior, the effect of absorbing and damping vibration of the pipe (2) is low. On the other hand, the holders of Comparative Examples 6 and 7 were excellent in vibration isolation, but had low holding force of the pipe. In particular, Comparative Example 7 showed the best vibration damping property, but the pipe pull-out force was as low as 12N, and the assembling work of the pipe (2) was easy. It is likely that it will not be suitable for actual use.

On the other hand, the holder (1) of the first embodiment is
Since the pulling force and insertion force of the pipe showed appropriate values,
(2) can be easily attached and detached, and piping (2)
It is possible to prevent the pipe (2) from falling off from the holder (1) and to prevent misalignment. Further, since the vibration-proof performance is excellent, it is possible to favorably absorb and attenuate the vibration of the pipe (2) by the holder (1). And, due to the excellent vibration absorption and damping properties, the amplification of the vibration of the pipe (2) and the propagation of the vibration to the adjacent pipe (2) and the connection destination are prevented, so that the generation of noise and the deterioration of the function of the apparatus can be reduced. Will prevent it. Also, the pulsation from the connecting end of the pipe (2) is absorbed and attenuated by the holder (1), so that it is possible to prevent the pipe (2) from being adversely affected. Alternatively, since the vibration transmitted from the underfloor panel or the front panel to the holder (1) is absorbed and attenuated by the holder (1) itself, the vibration is applied to the pipe (2) attached to the holder (1). Is not propagated so much, and the generation of noise and the like can be prevented well.

Further, the holder (1) of the first embodiment is formed by providing the rib (10) in the hollow portion (8) of the fixed body (3), but without the rib (10). A fixed body (3) can also be formed. In the next experiment, the holder (1) of the first embodiment provided with the rib (10) and the holder (1) of another different second embodiment formed without the rib (10) are described. , Pipe removal force / insertion force measurement experiment and vibration isolation performance experiment.

Experiment for measuring pipe pull-out force / insertion force In the holder (1) of each embodiment, six pipe recesses (6)
And pipes a (outside diameter 8.0 mm), pipes b, c, d
(Outer diameter 6.35mm) and pipes e and f (outer diameter 4.76mm) are attached. Then, six pipes were withdrawn one by one in the vertical direction and inserted, and the load required for each operation was measured. Table 4 shows the measurement results.

[0050]

[Table 4]

Next, a vibration isolation performance experiment was performed on the holder (1) of the first and second embodiments. Pipe for vibration input (1
1), vibration detection pipe (12) and other pipes (1)
The mounting method and vibration measuring method and measuring device of 3) were set to the same conditions as in the above-described vibration isolation performance experiment. However, this time, as shown in FIG. 4, both ends of the input pipe (11) were
Vibration was applied by connecting to (16). The vibration input conditions are as follows, and the measurement results are shown in Table 5 and the line graph in FIG. In the case of 50 Hz, the input acceleration is set to 5.49 m / s ² and the input amplitude is increased due to the restriction of the vibration tester. Input waveform: sine wave (excitation direction: vertical) Input amplitude: 0.05mmP-P constant (except 50Hz) Excitation frequency: 50, 75, 100, 125, 150, 175Hz Input acceleration: 5.49, 5.49, 9.81, 15.40, 22.16, 30.20m
/ s ²

[0052]

[Table 5]

From the results shown in Table 4 above, the first embodiment in which the rib (10) is provided has a greater pipe pull-out force than the second embodiment in which the rib (10) is not provided. Therefore, the holder
(1) has a strong clamping force, and the effect of preventing the pipe (2) from falling off and displacing is higher than that of the holder (1) of the second embodiment. Also ribs
The provision of (10) has higher rigidity and can better prevent the holder (1) from warping or bending. However, the holder (1) of the second embodiment also has good pull-out force and insertion force of the pipe, and
Excellent pinchability of (2). Further, when the rib (10) is not provided, the labor and material for manufacturing can be saved. In addition, as shown in Table 5, both the first and second embodiments absorb vibrations.
A holder (1) having excellent damping properties. Therefore, it is preferable to form the holder (1) in any appropriate shape with or without the rib (10) in consideration of the purpose of use, the labor of manufacturing, and the like.

[0054]

According to the present invention, a polyethylene resin having a hardness of D45 to 55 and a hardness of A65 to 85 are provided.
Ethylene-α olefin copolymer, and a holder formed of a mixed material of a foaming agent, is excellent in pinchability to piping,
In addition to being able to prevent dropping and displacement, the vibration absorption and damping properties are excellent. Further, such a holder can be easily formed by a simple manufacturing method without using a plurality of members.

Then, the under floor panel of the automobile,
The holder of the present invention is connected to the front panel or the like, and a fuel main pipe for supplying fuel from the fuel tank to the engine room to the holder, a fuel return pipe for returning surplus fuel from the engine to the fuel tank, and a fuel in the fuel tank. By installing evaporative piping for adsorbing steam to the canister in the engine room, brake piping for ABS, clutch piping, cable piping, and other piping, it is possible to exhibit excellent vibration and sound insulation effects. it can.

That is, the vibration of the pipe itself due to the flow of fuel, the operation of the brake and the clutch, the contact points of the engine block, the brake, the clutch, and other pipes, and the vibration transmitted from the adjacent pipe are improved by the holder. In addition to preventing the noise from being adversely affected by the vibration, the generation of noise is satisfactorily prevented. In addition, due to the excellent vibration absorbing property of the holder, it is possible to prevent the propagation of vibration to adjacent pipes mounted on the same holder and to a connection destination of each pipe. Further, even if vibration from the engine or the road surface propagates to the holder through the underfloor panel or the front panel, the vibration is absorbed and attenuated by the holder itself. Therefore, it is possible to prevent the propagation of vibration to each pipe attached to the holder, to have no adverse effect on the pipe, and to satisfactorily prevent the generation of noise and the like.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing one embodiment of a holder of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a schematic diagram of a vibration isolation performance experiment.

FIG. 5 is a line graph showing the results of measuring vibration isolation performance in Table 3.

FIG. 6 is a line graph showing the results of measuring vibration isolation performance in Table 5.

[Explanation of symbols]

 2 Piping 3 Fixed body 4 Base 5 Fixed projection 6 Piping recess 7 Engagement piece 8 Hollow part 10 Rib

Claims (6)

[Claims] A fixed body is formed by projecting a plurality of fixed protrusions on the surface of a base portion, and providing a pipe recess for mounting a pipe between the fixed protrusions to form a fixed body. Polyethylene resin of hardness D45-55, hardness A65-85
Of the ethylene-α-olefin copolymer and the foaming agent, and the mixing ratio of the ethylene-α-olefin copolymer is 0.5 to 1.
5. A vibration absorbing holder for piping, wherein the foaming agent is 0.04 to 0.12. 2. The fixing body is made of a polyethylene resin having a hardness of D48, an ethylene-α-olefin copolymer having a hardness of A83,
2. A holder for absorbing vibration of a pipe according to claim 1, wherein said holder is formed by mixing a foaming agent. 3. The fixing body is composed of a polyethylene resin, an ethylene-α-olefin copolymer and a foaming agent in a mixing ratio of 1 ethylene-α-olefin copolymer and 0.08 foaming agent per polyethylene resin. 2. The holder for absorbing vibration of piping according to claim 1, wherein: 4. The fixed projection projects an engaging piece in the direction of the pipe recess, and the engaging piece abuts on the surface of the pipe engaged with the pipe recess in the pull-out direction so as to be engageable. The holder for absorbing vibration of piping according to claim 1. 5. The holder for absorbing vibration of piping according to claim 1, wherein a hollow portion is provided in a base portion of the fixed main body by hollowing out between adjacent piping recesses in parallel with the piping recesses. 6. The holder for absorbing vibration of piping according to claim 5, wherein a rib is provided in the center of the hollow portion.