JP2000310359A - Piping fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of piping positioning performance and vibration isolating performance by preventing inclination of the projected part of a vibration isolating member. SOLUTION: A rubber vibration isolating member 5 has many circumferentially arranged projected parts 52, 53 on both the sides of a plate part 51 extended in the circumferential direction of a piping 4, and these projected parts 52, 53 are circumferentially shiftingly arranged so as not to be overlapped in radial direction. Vibration of the piping 4 is absorbed by the shearing deformation of the plate part 51 of the vibration isolating member 5, therefore, vibration isolating performance superior to vibration absorption by compressive deformation can be obtained. Inner circumference connecting parts 54 for mutually connecting adjacent inner circumferential projected parts 52 and periphery connecting parts 55 for mutually connecting adjacent peripheral projected parts 53 are arranged, and in the case that the projected parts 52, 53 are almost brought down by external force, stress is generated in the connecting parts 54, 55 and the inclination of the projected parts 52, 53 can be prevented by the stress, therefore, expected positioning performance and vibration isolating performance can be stably obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe fixing structure for positioning a pipe, and is suitable for fixing a refrigerant pipe forming a refrigerant circuit of a vehicle air conditioner, for example.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, a conventional vehicle air conditioner is driven by an engine of a vehicle (not shown) to compress and discharge refrigerant, and heats high-pressure gas refrigerant and outside air. A refrigeration cycle is constituted by a condenser 2 for exchanging refrigerant by condensing, a gas-liquid separator, an expansion valve and an evaporator (not shown). Are connected via a pipe 4.
The pipe 4 is held by a clamp member 6 via a rubber vibration isolating member 5, and the clamp member 6 is fixed to a body 7 of the vehicle with bolts 8 and nuts 9.

FIG. 7 shows a piping fixing structure of a vehicle air conditioner proposed by the present inventor in the DENSO published technical bulletin (reference number 119-081, issued on April 15, 1998). The rubber vibration-absorbing member 5 disposed between the pipe 4 and the clamp member 6 is provided with protrusions 52 and 53 on the inner peripheral side and the outer peripheral side of the plate 51 extending in the circumferential direction of the pipe 4. The inner projection 52 and the outer projection 53 do not overlap in the radial direction.
2, 53 are displaced in the circumferential direction.

According to this pipe fixing structure, the vibration of the pipe 4 is absorbed by the shearing deformation of the plate portion 51 of the vibration isolating member 5, so that a vibration damping performance better than that absorbing vibration by compressive deformation is obtained. Can be

[0005]

However, the restoring force (reaction force) of the hose 3 arranged in a curved state acts on the protrusions 52 and 53 of the vibration isolating member 5 via the pipe 4 and the clamps. Since the fastening force of the member 6 directly acts, as shown in FIG. 8, a part of the projections 52 and 53 of the vibration isolating member 5 may fall down, and in this case, the positioning property and the vibration isolating performance of the pipe 4 are reduced. There was a problem of lowering.

FIG. 9 shows a result of noise measurement in a driver's seat of a vehicle. A characteristic a (dot-dash line) when about half of the projections 52 and 53 are falling, and a normal posture of the projections 52 and 53 are shown. As is clear from the comparison with the characteristic b (solid line) at the time of, when the projections 52 and 53 fall down, the inner circumference projection 52 and the outer circumference projection 53 locally overlap in the radial direction. Since the vibration is absorbed by the compression deformation, the vibration isolation performance is reduced, the vibration transmission to the body 7 is increased, and the noise level is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent a protrusion of a vibration isolating member from falling down, thereby preventing a deterioration in positioning performance of a pipe and vibration isolating performance.

[0008]

In order to achieve the above object, according to the first to fifth aspects of the present invention, an anti-vibration member (5) is disposed between a pipe (4) and a clamp member (6). The vibration isolating member (5) has projections (52, 53) on the inner and outer peripheral sides of a plate (51) extending in the circumferential direction of the pipe (4).
Are provided, and the inner peripheral projection (52) and the outer peripheral projection (5) are provided.
3), a plurality of inner peripheral connecting portions (54) interconnecting a number of inner peripheral projecting portions (52), and a number of outer peripheral members in a pipe fixing structure arranged so as to be shifted in the circumferential direction so as not to overlap in the radial direction. Peripheral connecting part (55) connecting the protruding parts (53) to each other
Are provided on the vibration isolating member (5).

According to this, the projections (52, 5
In the case where 3) is about to fall, the projections (52, 53) can be prevented from falling due to the stress generated in the connecting portions (54, 55), so that the intended positioning and vibration damping performance can be stably performed. Can be obtained. According to the second aspect of the present invention, the gap (5) is provided between the inner peripheral connecting portion (54) and the pipe (4).
7) is formed.

According to this, since the inner peripheral connecting portion (54) does not contact the pipe (4), the inner peripheral connecting portion (54) has an adverse effect due to the contact between the inner peripheral connecting portion (54) and the pipe (4), that is, the inner peripheral connecting portion (54) at the time of absorbing vibration. It is possible to prevent the occurrence of compressive stress in the portion (54) and the deterioration of the vibration isolation performance. A third aspect of the present invention is characterized in that a gap (58) is formed between the outer peripheral connecting portion (55) and the clamp member (6).

According to this, since the outer peripheral connecting portion (55) does not come into contact with the clamp member (6), an adverse effect due to the contact between the outer peripheral connecting portion (55) and the clamp member (6), ie,
It is possible to prevent the occurrence of a compressive stress in the outer peripheral connecting portion (55) at the time of vibration absorption and a decrease in vibration isolation performance.
According to the fourth aspect of the present invention, the anti-vibration member (5) is provided with a locking projection (56) projecting further to the outer peripheral side than the outer peripheral projection (53). A locking portion (61) for locking the locking projection (56) is formed.

According to this, by locking the locking projection (56) to the locking portion (61), it is possible to prevent the vibration isolating member (5) from being displaced or falling out of the clamp member (6). Can be. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means described in embodiment mentioned later.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. (First Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention, which is used, for example, for fixing a pipe 4 of a vehicle air conditioner as shown in FIG.

FIG. 1 shows the entire structure of the pipe fixing structure. A rubber vibration isolator 5 is disposed on the outer periphery of a metal (for example, aluminum) pipe 4. A clamp member 6 (for example, a rolled steel material) is disposed. The material of the vibration isolating member 5 is heat resistance, water resistance,
Rubber (eg, EPDM) having excellent oil resistance and ozone resistance is desirable.

After assembling the pre-integrated anti-vibration member 5 and the clamp member 6 so as to be wound around the outer periphery of the pipe 4, the end of the clamp member 6 and the intermediate part are connected by screws 10, so that the pipe The vibration damping member 5 and the clamp member 6 are integrated with the member 4. Then, the pipe 4 is fixed to the body 7 by fixing the clamp member 6 to the body 7 of the vehicle with bolts 8 and nuts 9.

As shown in FIGS. 2 and 3, the vibration isolating member 5 has a plate portion 51 extending in the circumferential direction of the pipe 4, and the plate portion 51 has a thickness of about 1 mm in the radial direction of the pipe 4. , Piping 4
Is set to about 23 mm in the longitudinal direction. On the inner peripheral side of the plate portion 51, a number of inner peripheral protrusions 52 projecting from the plate portion 51 toward the pipe 4 are provided in the circumferential direction. A large number of outer peripheral projections 53 projecting toward the member 6 are provided in the circumferential direction.

Here, each of the projections 52 and 53 has a projection height of about 3 mm, a circumferential thickness of about 2 mm, a circumferential pitch of about 6 mm, and is further divided into two parts in the longitudinal direction of the pipe 4. ing. Further, the inner peripheral projection 52 and the outer peripheral projection 53
The projections 52 and 53 are arranged so as to be shifted from each other in the circumferential direction so that the projections 52 and 53 do not overlap in the radial direction.
a.

Adjacent inner peripheral projections 52 are connected by an inner peripheral connecting portion 54, and adjacent outer peripheral projecting portions 53 are connected by an outer peripheral connecting portion 55. Each connecting portion 54, 55 The thickness in the longitudinal direction is set to about 0.3 mm. In each of the connecting portions 54 and 55, the radial height of the pipe 4 is set to about 2 mm, and is about 1 mm lower than the protruding height of each of the protrusions 52 and 53. Accordingly, a gap 57 is formed between the inner peripheral connecting portion 54 and the pipe 4, and a gap 58 is formed between the outer peripheral connecting portion 55 and the clamp member 6.

A total of three locking projections 56 are formed on the vibration isolating member 5 near the both ends and near the center in the circumferential direction. I have. The locking projection 56 has a columnar portion 56 a having a smaller diameter than the width of the slit 61 and a flange portion 56 b having a larger diameter than the width of the slit 61. Then, the locking projection 56 is inserted into the slit 61, and the flange 56 b is inserted into the slit 6.
By engaging with one edge, the vibration isolating member 5 and the clamp member 6 are integrated.

Next, the anti-vibration function of this embodiment having the above-described configuration will be described. When the pipe fixing structure of the present embodiment is applied to fixing of a refrigerant pipe of a vehicle air conditioner, vibration of an engine or a compressor and pressure pulsation of refrigerant discharged from the compressor are transmitted to a pipe 4 via a hose. With the vibration of the pipe 4, as shown in FIG.
a is deformed to absorb the vibration, and in this case, the connection portion 51a
Since the vibration of the pipe 4 is absorbed by the shear deformation, good vibration isolation performance is obtained, and the transmission of vibration to the body 7 can be significantly reduced.

When an excessive vibration input is applied to the pipe 4, the plate portion 51 is further deformed than in the state shown in FIG. 4, and the plate portion 51 comes into contact with the pipe 4 or the clamp member 6, and furthermore. Excessive displacement (run-out) of the pipe 4 is suppressed, and breakage of the pipe 4 is prevented. Hereinafter, features of the present embodiment will be described. Conventionally, by the external force acting on the projections 52 and 53,
As shown in FIG. 8, the protrusions 52 and 53 of the vibration isolating member 5 may fall down.
Since stress is generated at 4, 55, and the stress (mainly tensile stress) can prevent the projections 52, 53 from falling down, it is possible to stably obtain desired positioning properties and anti-vibration performance. .

Also, the inner peripheral projection 5 is larger than the inner peripheral connecting portion 54.
Since the tip of 2 is projected so that the inner peripheral connecting portion 54 does not come into contact with the pipe 4, adverse effects due to the contact between the inner peripheral connecting portion 54 and the pipe 4, that is, the inner peripheral connecting portion 54 It is possible to prevent the occurrence of the compressive stress and the deterioration of the vibration isolation performance before it occurs. In addition, since the tip of the outer peripheral projection 53 projects beyond the outer peripheral connector 55 so that the outer peripheral connector 55 does not come into contact with the clamp member 6, an adverse effect due to the contact between the outer peripheral connector 55 and the clamp member 6, That is, it is possible to prevent the occurrence of a compressive stress in the outer peripheral connecting portion 55 at the time of absorbing the vibration and the deterioration of the vibration isolation performance.

Further, the locking projection 56 is formed by a slit 61
, It is possible to prevent the vibration isolating member 5 from being displaced with respect to the clamp member 6 and from falling off. (Second Embodiment) In the above embodiment, the connecting portions 54 and 55 of the vibration isolating member 5 are connected to the plate portion 51.
In the second embodiment shown in FIG.
1 and gaps 59a and 59b are formed between the connecting portions 54 and 55 and the plate portion 51.

In the first embodiment, since the connecting portions 54 and 55 are connected to the plate portion 51, the plate portion 51 during vibration absorption is connected.
The connecting portions 54 and 55 are also deformed along with the deformation. On the other hand, in the present embodiment, even if the plate portion 51 is deformed, the gap 59
Until a and 59b disappear, the connecting portions 54 and 55 do not deform. Therefore, as the spring constant of the vibration isolating member 5 decreases, the vibration isolating performance improves.

(Other Embodiments) The present invention is applicable not only to the refrigerant piping of a vehicle air conditioner but also to, for example, a hydraulic piping for power steering of a vehicle. Further, the present invention is not limited to vehicles, and may be applied to, for example, refrigerant pipes of home air conditioners. Further, a rubber anti-vibration member having an appropriate shape may be interposed between the clamp member 6 and the body 7.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a pipe fixing structure according to the present invention.

FIG. 2 is a perspective view of the vibration isolating member of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged view of a main part used for describing the operation of the first embodiment.

FIG. 5 is a configuration diagram of a main part showing a second embodiment of the pipe fixing structure according to the present invention.

FIG. 6 is a schematic configuration diagram of a vehicle air conditioner having a conventional pipe fixing structure.

FIG. 7 is a configuration diagram of the pipe fixing structure of FIG. 6;

FIG. 8 is an enlarged view of a main part used for describing an operation of the pipe fixing structure of FIG. 6;

FIG. 9 is a characteristic diagram for explaining the operation of the pipe fixing structure of FIG. 6;

[Explanation of symbols]

4 pipe, 5 vibration damping member, 6 clamp member, 7 body (mounting member), 51 plate portion, 52 inner projection, 53
... Outer peripheral projection, 54... Inner peripheral connecting part, 55.

Claims (5)

[Claims] 1. A rubber vibration isolator (5) is arranged on the outer periphery of a pipe (4), and a clamp member (6) holding the outer periphery of the vibration isolator (5) is fixed to a mounting member (7). The vibration isolating member (5) has a plate portion (51) extending in the circumferential direction of the pipe (4), and projects from the plate portion (51) toward the pipe (4). An inner peripheral protrusion (52) having a distal end in contact with the pipe (4) and arranged in a large number in the circumferential direction, and a distal end protruding from the plate (51) toward the clamp member (6) and having a distal end facing the clamp member (6). ) And a large number of outer peripheral projections (53) arranged in the circumferential direction, and the inner peripheral projection (52) and the outer peripheral projection (53) of the vibration damping member (5) are arranged in the radial direction. In a pipe fixing structure which is displaced in the circumferential direction so as not to overlap, the plurality of inner peripheral projections (5 2) The vibration-proofing member (5) is provided with an inner connecting portion (54) for connecting each other and an outer connecting portion (55) for connecting the plurality of outer protrusions (53) to each other. And piping fixing structure. 2. The pipe fixing structure according to claim 1, wherein a gap (57) is formed between the inner peripheral connecting portion (54) and the pipe (4). 3. The pipe fixing structure according to claim 1, wherein a gap (58) is formed between the outer peripheral connecting portion (55) and the clamp member (6). 4. A locking projection (56) projecting further to the outer peripheral side than the outer peripheral projection (53) is formed on the vibration isolating member (5), and the clamp member (6) is provided with the locking projection (56). The pipe fixing structure according to any one of claims 1 to 3, wherein a locking portion (61) to which the locking projection (56) is locked is formed. 5. The refrigerant pipe according to claim 1, wherein the pipe is a refrigerant pipe forming a refrigerant circuit of an air conditioner.
5. The pipe fixing structure according to any one of Items 4 to 4.