JP4211134B2 - Piping fixing structure - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
As shown in FIGS. 6 and 7, a conventional vehicle air conditioner is driven by a vehicle engine (not shown) to compress and discharge refrigerant, heat exchange between high-pressure gas refrigerant and outside air, and A refrigeration cycle is constituted by a condenser 2 to be condensed, a gas-liquid separator (not shown), an expansion valve and an evaporator, and these components are connected through a hose 3 and a metal pipe 4 in which rubber and reinforcing yarn are laminated. Connected. The pipe 4 is held by a clamp member 6 via a rubber vibration-proof member 5, and the clamp member 6 is fixed to a vehicle body 7 with bolts 8 and nuts 9.
[0003]
FIG. 7 shows a piping fixing structure of a vehicle air conditioner proposed by the present inventor in Denso Public Technical Report (reference number 119-081, issue date: April 15, 1998). The rubber vibration isolating member 5 disposed between the clamp member 6 and the clamp member 6 has a large number of protrusions 52 and 53 in the circumferential direction on the inner and outer peripheral sides of the plate portion 51 extending in the circumferential direction of the pipe 4. Further, both the protrusions 52 and 53 are arranged so as to be shifted in the circumferential direction so that the inner peripheral protrusion 52 and the outer peripheral protrusion 53 do not overlap in the radial direction.
[0004]
According to this pipe fixing structure, the vibration of the pipe 4 is absorbed by the shear deformation of the plate portion 51 of the vibration isolation member 5, so that a vibration isolation performance superior to that which absorbs the vibration by compression deformation is obtained.
[0005]
[Problems to be solved by the invention]
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 clamping force of the clamp member 6 acts directly. For this reason, as shown in FIG. 8, some of the protrusions 52 and 53 of the vibration isolating member 5 may fall down. In this case, there is a problem that the positioning property and the vibration isolating performance of the pipe 4 are deteriorated.
[0006]
FIG. 9 shows the noise measurement results at the vehicle driver's seat. The characteristic a (dash-dot line) when about half of the protrusions 52 and 53 are tilted, and when the protrusions 52 and 53 are in a normal posture. As is clear from the comparison with the characteristic b (solid line), when the protrusions 52 and 53 fall down, the inner peripheral protrusions 52 and the outer peripheral protrusions 53 locally overlap in the radial direction, and the portion is caused by compression deformation. Since the vibration is absorbed, the vibration-proof performance is lowered, the vibration transmission to the body 7 is increased, and the noise level is increased.
[0007]
The present invention has been made in view of the above points, and it is an object of the present invention to prevent the protrusions of the vibration-proofing member from falling and prevent deterioration of the positioning performance and vibration-proof performance of the pipe.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the inventions according to claims 1 to 5, the vibration isolating member (5) is disposed between the pipe (4) and the clamp member (6), and the vibration isolating member (5) The protrusions (52, 53) are provided on the inner peripheral side and the outer peripheral side of the plate part (51) extending in the circumferential direction of the pipe (4), and the inner peripheral protrusion part (52) and the outer peripheral protrusion part (53) However, in the pipe fixing structure arranged in the circumferential direction so as not to overlap in the radial direction,
A plurality of inner peripheral protrusions (52) are connected to an inner peripheral connection part (54) and a plurality of outer peripheral protrusions (53) are connected to an outer peripheral connection part (55) as vibration isolating members (5). It is characterized by providing.
[0009]
According to this, when the protrusions (52, 53) are to be tilted by an external force, the protrusions (52, 53) can be prevented from falling due to the stress generated in the connecting parts (54, 55). Thus, the desired positioning performance and vibration isolation performance can be obtained.
The invention according to claim 2 is characterized in that a gap (57) is formed between the inner peripheral connecting portion (54) and the pipe (4).
[0010]
According to this, since the inner peripheral connecting portion (54) does not contact the pipe (4), the inner peripheral connecting portion (54) is adversely affected by the contact between the inner peripheral connecting portion (54) and the pipe (4), that is, when the vibration is absorbed. ) Can be prevented from occurring in advance due to the occurrence of compressive stress.
The invention according to claim 3 is characterized in that a gap (58) is formed between the outer peripheral connecting portion (55) and the clamp member (6).
[0011]
According to this, since the outer peripheral connecting portion (55) does not contact the clamp member (6), the outer peripheral connecting portion (55) is not affected by the contact between the outer peripheral connecting portion (55) and the clamp member (6), that is, when absorbing the vibration. It is possible to prevent the vibration-proof performance from being reduced due to the occurrence of compressive stress.
In the invention according to claim 4, the vibration isolating member (5) is formed with a locking protrusion (56) that protrudes further to the outer peripheral side than the outer peripheral protrusion (53), and the clamp member (6) It is characterized in that a locking portion (61) for locking the locking projection (56) is formed.
[0012]
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 dropped from the clamp member (6).
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below.
(First embodiment)
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.
[0014]
FIG. 1 shows an overall configuration of a pipe fixing structure, in which a rubber vibration isolating member 5 is arranged on the outer periphery of a metal (for example, aluminum) pipe 4, and a metal (for example, rolling) is disposed on the outer periphery of the vibration isolating member 5. A steel steel) clamping member 6 is disposed. The material of the vibration isolation member 5 is preferably rubber (for example, EPDM) having excellent heat resistance, water resistance, oil resistance, and ozone resistance.
[0015]
After assembling the vibration isolating member 5 and the clamp member 6 integrated in advance so as to be wound around the outer periphery of the pipe 4, the end portion and the intermediate portion of the clamp member 6 are coupled with the screw 10, thereby Thus, the vibration isolation member 5 and the clamp member 6 are integrated. The pipe 4 is fixed to the body 7 by fixing the clamp member 6 to the vehicle body 7 with bolts 8 and nuts 9.
[0016]
As shown in FIGS. 2 and 3, the vibration isolating member 5 is formed with a plate portion 51 extending in the circumferential direction of the pipe 4. The plate portion 51 has a thickness of about 1 mm in the radial direction of the pipe 4 and the pipe 4. The width in the longitudinal direction is set to about 23 mm.
A large number of inner peripheral projections 52 projecting from the plate portion 51 toward the pipe 4 are provided in the circumferential direction on the inner peripheral side of the plate portion 51, and clamped from the plate portion 51 on the outer peripheral side of the plate portion 51. A large number of outer peripheral projections 53 projecting toward the member 6 are provided in the circumferential direction.
[0017]
Here, the protrusions 52 and 53 are set to have a protruding height of about 3 mm, a circumferential thickness of about 2 mm, a circumferential pitch of about 6 mm, and further divided into two in the longitudinal direction of the pipe 4. Further, both the protrusions 52 and 53 are arranged so as to be shifted in the circumferential direction so that the inner peripheral protrusion 52 and the outer peripheral protrusion 53 do not overlap in the radial direction, and the adjacent inner peripheral protrusion 52 and outer peripheral protrusion are adjacent to each other. 53 are connected by a connecting portion 51 a in the plate portion 51.
[0018]
Adjacent inner peripheral protrusions 52 are connected by an inner peripheral connection part 54, adjacent outer peripheral protrusions 53 are connected by an outer peripheral connection part 55, and the connection parts 54, 55 are connected in the longitudinal direction of the pipe 4. The thickness is set to about 0.3 mm.
In addition, each of the connecting portions 54 and 55 has a radial height of the pipe 4 set to about 2 mm, which is about 1 mm lower than the protruding height of each of the protruding portions 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.
[0019]
The vibration isolating member 5 is formed with a total of three locking projections 56 that are locked by slits (locking portions) 61 of the clamp member 6, near both ends and the center in the circumferential direction. The locking projection 56 is formed with a cylindrical 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 vibration isolating member 5 and the clamp member 6 are integrated by inserting the locking projection 56 into the slit 61 and engaging the flange 56 b with the edge of the slit 61.
[0020]
Next, the anti-vibration action of the present embodiment having the above configuration will be described.
When the pipe fixing structure of the present embodiment is applied to fixing the refrigerant pipe of the vehicle air conditioner, the vibration of the engine and the compressor and the pressure pulsation of the refrigerant discharged from the compressor are transmitted to the pipe 4 through the hose. As the pipe 4 vibrates, the connecting portion 51a in the plate portion 51 is deformed and absorbed as shown in FIG. 4. In this case, the vibration of the pipe 4 is absorbed by the shear deformation of the connecting portion 51a. Therefore, vibration transmission to the body 7 can be remarkably reduced.
[0021]
In addition, when there is excessive vibration input to the pipe 4, the plate portion 51 is further deformed than in the state of FIG. 4, and the plate portion 51 comes into contact with the pipe 4 or the clamp member 6. Excessive displacement (vibration) is suppressed, and breakage of the pipe 4 is prevented.
Hereinafter, features of the present embodiment will be described.
Conventionally, as shown in FIG. 8, the projections 52 and 53 of the anti-vibration member 5 sometimes fall down due to the external force acting on the projections 52 and 53. However, in this embodiment, the projections are caused by the external force. When 52 and 53 are about to fall down, stress is generated in the connecting portions 54 and 55, and the stress (mainly tensile stress) can prevent the protrusions 52 and 53 from falling down. It is possible to obtain the initial positioning and vibration isolation performance.
[0022]
In addition, since the tip of the inner peripheral projection 52 protrudes from the inner peripheral connection part 54 so that the inner peripheral connection part 54 does not contact the pipe 4, the contact between the inner peripheral connection part 54 and the pipe 4 is caused. It is possible to prevent an adverse effect, that is, a reduction in the vibration-proof performance due to the occurrence of compressive stress in the inner peripheral connecting portion 54 during vibration absorption.
Moreover, since the front-end | tip of the outer periphery projection part 53 protrudes rather than the outer periphery connection part 55, and the outer periphery connection part 55 is made not to contact the clamp member 6, the bad influence by contact with the outer periphery connection part 55 and the clamp member 6, That is, it is possible to prevent the vibration-proof performance from being deteriorated due to the occurrence of compressive stress in the outer peripheral connecting portion 55 during vibration absorption.
[0023]
Further, by locking the locking projection 56 to the slit 61, it is possible to prevent the vibration isolating member 5 from being displaced relative to the clamp member 6 and 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, whereas in the second embodiment shown in FIG. 5, the connecting portions 54 and 55 are connected to the plate portion 51. However, gaps 59 a and 59 b are formed between the connecting portions 54 and 55 and the plate portion 51.
[0024]
In 1st Embodiment, since each connection part 54 and 55 and the board part 51 are connected, each connection part 54 and 55 deform | transforms with the deformation | transformation of the plate part 51 at the time of vibration absorption. On the other hand, in this embodiment, even if the plate portion 51 is deformed, the connecting portions 54 and 55 are not deformed until the gaps 59a and 59b disappear. Accordingly, the vibration isolating performance is improved by the reduction in the spring constant of the vibration isolating member 5.
[0025]
(Other embodiments)
The present invention is not limited to the refrigerant pipe of the vehicle air conditioner, and can be applied to, for example, a hydraulic pipe for power steering of the vehicle. Further, the present invention can be applied not only to a vehicle but also to a refrigerant pipe of a home air conditioner, for example.
Furthermore, a rubber vibration isolator 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.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is an enlarged view of a main part for explaining the operation of the first embodiment.
FIG. 5 is a configuration diagram of a main part showing a second embodiment of a 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.
7 is a configuration diagram of the pipe fixing structure of FIG. 6;
FIG. 8 is an enlarged view of a main part for explaining the 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 ... Piping, 5 ... Vibration isolation member, 6 ... Clamp member, 7 ... Body (mounting member),
51 ... Plate part, 52 ... Inner peripheral projection part, 53 ... Outer peripheral projection part, 54 ... Inner peripheral connection part,
55 ... Peripheral connection part.

Claims (5)

A pipe fixing structure in which a rubber vibration isolating member (5) is arranged on the outer periphery of the pipe (4), and a clamp member (6) holding the outer periphery of the vibration isolating member (5) is fixed to the mounting member (7). There,
The vibration isolating member (5) has a plate portion (51) extending in the circumferential direction of the pipe (4), and protrudes from the plate portion (51) toward the pipe (4) so that a tip thereof extends to the pipe (4). A large number of inner peripheral projections (52) that are in contact with each other and arranged in the circumferential direction, and project from the plate portion (51) toward the clamp member (6) and have their tips in contact with the clamp member (6) and a large number in the circumferential direction. An outer circumferential protrusion (53) disposed,
In the pipe fixing structure in which the inner peripheral protrusion (52) and the outer peripheral protrusion (53) of the vibration isolating member (5) are shifted in the circumferential direction so as not to overlap in the radial direction,
An inner peripheral connecting portion (54) that connects the multiple inner peripheral protrusions (52) to each other, and an outer peripheral connecting portion (55) that connects the multiple outer peripheral protrusions (53) to each other, A pipe fixing structure provided in 5). 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). The pipe fixing structure according to claim 1 or 2, wherein a gap (58) is formed between the outer peripheral connecting portion (55) and the clamp member (6). The anti-vibration member (5) is formed with a locking protrusion (56) that protrudes further to the outer peripheral side than the outer peripheral protrusion (53), and the locking member (6) has the locking protrusion The piping fixing structure according to any one of claims 1 to 3, wherein a locking portion (61) for locking (56) is formed. The pipe fixing structure according to any one of claims 1 to 4, wherein the pipe (4) is a refrigerant pipe that forms a refrigerant circuit of an air conditioner.

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