JP4140424B2 - Piping seal material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a pipe seal member that seals a pipe member for an air conditioner (hereinafter referred to as an air conditioner) that passes through a vehicle interior and a vehicle exterior of a vehicle with a partition wall.
[0002]
[Prior art]
In general, an air conditioner in a vehicle forms a refrigeration cycle between a compressor and a condenser disposed in an engine room outside the passenger compartment and an air conditioning unit disposed in the passenger compartment, thereby partitioning the passenger compartment from the exterior of the passenger compartment. The dashboard is provided with a seal mounting hole for a piping member that connects the vehicle interior and the exterior of the vehicle interior. When rainwater enters the engine room, or when the vehicle passes through the puddle, water splashed from the tires may enter, and the water that enters the engine room enters the vehicle compartment. In order to prevent this, the piping member is sealed with a piping sealing member (hereinafter referred to as a grommet) mounted in the seal mounting hole of the dashboard.
[0003]
And as this grommet, it was mentioned as a subject that waterproofing can be performed reliably and an undercut part is eliminated at the time of molding so that the die can be easily removed. For example, a conventional grommet is configured as shown in FIG. 7 (Patent Document 1).
[0004]
That is, the grommet 30 is provided integrally with the mounting base 31 that is mounted in the grommet mounting hole 3 a of the dashboard 3, the thin boot 32 that presses the piping member 5 to the inner periphery of the mounting base 31, and the boot 32. The ribs 33 are formed. The boot 32 has a ring portion 32a having a circular cross section at the portion that abuts the piping member 5, and is formed in a conical shape having a conical membrane portion 32b from the ring portion 32a, and is further folded back into a conical shape. Is formed. The rib 33 is formed integrally with the boot 32 so as to extend in the axial direction from the folded portion of the boot 32 in order to restrict the axial displacement of the conical membrane portion 32 b with respect to the mounting base 31. With this configuration, the product can be easily taken out from the mold at the time of molding, and the followability to the displacement of the piping member 5 is improved to improve the sealing performance.
[0005]
[Patent Document 1]
JP-A-8-195135 (refer to pages 3 to 4, see FIG. 1)
[0006]
[Problems to be solved by the invention]
However, in recent years, when a vehicle of a type in which a seal mounting hole for a piping member of a dashboard is disposed below and is installed on a floor body near a tire is developed, the water jumps when traveling on a puddle. As a result, it is necessary to further prevent water from entering the passenger compartment due to the above, and it has been cited as a problem to take a waterproof measure more than conventional.
[0007]
In the configuration of the grommet 30 shown in Patent Document 1, since the ring portion 32a that press-contacts the piping member 5 is formed so as to protrude out of the passenger compartment, the water in the puddle is splashed up by the tire and directly the grommet 30. Therefore, the water that is splashed up by the tire and has a momentum can easily enter the vehicle interior from the portion of the ring portion 32a that is in line contact.
[0008]
Furthermore, although the grommet having the configuration shown in Patent Document 1 is improved, a conical membrane part is doubled and a ring part is arranged in two places to form a double seal structure, but in this case, An undercut is formed between the double conical membrane portions, and when the grommet is formed, the mold is forcibly removed, and the product is easily damaged when the mold is removed. Therefore, it becomes easy to infiltrate water from a damaged site, and the sealing performance is lowered.
[0009]
An object of the present invention is to solve the above-mentioned problems, and to provide a pipe seal member that can be molded without excessive die cutting during molding while further improving the sealing performance.
[0010]
[Means for Solving the Problems]
In the pipe seal member according to the present invention, in order to solve the above-described problem, in the present invention, the pipe seal member includes a lip portion that is attached to a partition wall that partitions the vehicle interior and the exterior of the vehicle interior, and a seal that presses against the pipe member. And a waterproof wall portion that surrounds the seal portion from the outside of the passenger compartment. That is, when the lip portion is attached to the seal member mounting hole of the partition wall that partitions the vehicle interior and the exterior of the vehicle and the piping member is inserted through the seal portion, the waterproof wall portion is configured to surround the seal member. It will be arrange | positioned so that it may extend toward the exterior from a vehicle interior.
[0011]
When the vehicle travels on the puddle, the water splashed by the tire is splashed toward the pipe seal member, hits a waterproof wall disposed outside the cabin of the pipe seal member, and falls to the ground. Therefore, the splashed water is protected by the waterproof wall and is difficult to reach the seal portion, so that it is difficult for the water to enter the vehicle compartment from the seal portion, thereby improving the waterproof property.
[0012]
Further, in the present invention, since the waterproof wall is formed so as to protrude from the end surface of the seal portion, the water splashed by the tire or the like is a stepped portion between the end surface of the waterproof wall and the end surface of the seal portion. Thus, it is possible to improve the sealing performance because it further protects the splashed water and makes it difficult to reach the seal portion.
[0013]
Further, in the present invention, by forming the waterproof wall so as to stand linearly from the lip portion, there is no portion for forming an undercut when forming the pipe seal member, so that the die can be easily removed. The product can be molded without damaging the product by not performing excessive die cutting.
[0014]
Further, as in the present invention, if the seal portion is formed so that the piping member can be pressed by surface contact, the seal surface is in surface contact even if the splashed water reaches the seal portion. By being formed long, the entry into the vehicle compartment can be prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0016]
The piping seal member of the embodiment is a grommet that is mounted in a grommet mounting hole formed in a partition wall that partitions the vehicle interior and the exterior of the vehicle interior in the vehicle air conditioner. As illustrated in FIGS. It is made of rubber and has elasticity, and is provided with a lip portion 12, a seal portion 13, and a waterproof wall portion 14 as shown in FIGS. In FIGS. 1 and 2, the upper side indicates the vehicle interior side, and the lower side indicates the vehicle interior side. FIG. 3 is a plan view of the grommet 10 as viewed from the vehicle interior side.
[0017]
That is, the lip portion 12 is formed so as to protrude from the pair of cylindrical outer peripheral wall portions 11 and 11 formed to protrude toward the vehicle interior side over the entire circumference of the ellipse in the direction orthogonal to the axial direction. The long vehicle interior side lip portion 121 and the short vehicle interior outer lip portion 122 are formed so as to overlap each other with a gap portion 123. A small groove 124 is formed on the vehicle interior side surface of the vehicle interior side lip 121 over the entire circumference.
[0018]
The seal portion 13 is formed by extending thin conical cylindrical wall portions 131 and 131 from the vehicle interior side end portions of the pair of outer peripheral wall portions 11 and 11 toward the outside of the vehicle interior. Bottom wall portions 132 and 132 having fitting holes 133A and 133B that fit into the piping member 5 (5A and 5B) shown in FIG. Each fitting hole 133 is formed as a tapered surface having an enlarged diameter on the vehicle interior side, and the maximum diameter of the tapered surface can be formed to be substantially the same as or slightly larger than the outer diameter of the piping member 5 and can be strongly fitted to the piping member. It is formed as follows. One seal portion 13A in the pair of seal portions 13 is formed by making the conical wall portion 131 and the bottom wall portion 132 smaller than the other seal portion 13B.
[0019]
In the fitting holes 133A and 133B formed in the pair of seal portions 13A and 13B, one fitting hole 133A has, for example, a small-diameter pipe for allowing the refrigerant to flow into the air conditioning unit (not shown) from the outside of the passenger compartment. A small diameter pipe member 5B (see FIG. 4) is formed to fit the member 5A (see FIG. 4), and the other fitting hole 133B flows from the air conditioning unit in the vehicle compartment to the outside of the vehicle compartment. ) In order to fit.
[0020]
The seal portion 13 will be described in more detail. As shown in FIG. 5, the bottom wall portion 132 connected to the conical cylindrical wall portion 131 is formed thicker than the conical cylindrical wall portion 131. The cross-sectional shape of the single-walled portion excluding the fitting surface 133 is formed in a substantially triangular shape that makes the width of the fitting surface 133 long, and the fitting surface 133 is a tapered surface as described above. Is formed. Then, when the piping member 5 is inserted through the fitting surface 133, the maximum diameter portion of the tapered surface of the fitting portion 133 is smaller than the outer diameter of the piping member 5, so that the piping member 5 follows the outer peripheral surface of the piping member 5. It will press-contact with an outer peripheral surface. Furthermore, since the width direction (up and down direction in FIG. 5) of the taper surface is formed in a long shape, the contact area with the piping member 5 can be widened by surface contact. Thereby, the sealing performance can be improved.
[0021]
The waterproof wall portion 14 is connected to the lip portion 12 and is formed so as to protrude linearly along the axial direction of the seal portion 13 from the lip portion 12 to the outside of the vehicle compartment, and a pair of seal portions 13A and 13B. Is formed in the shape of an oblong plate having a pair of space portions 141 and 141 so as to surround. The end surface of the waterproof wall portion 14 is formed so as to protrude downward from the end surface of the seal portion 13 in FIG. 2 so as to prevent intrusion into the seal portions 13A and 13B due to water splashing.
[0022]
Therefore, the grommet 10 formed as described above is fitted with the lip portion 12 in the grommet mounting hole 3a formed in the partition wall 3 as shown in FIG. Insert the wall and install it. When the piping member 5 is inserted from the large diameter side of the fitting hole 133 of the seal portion 13, that is, from the passenger compartment side, the tapered surface formed in the fitting hole 133 is a pipe formed to have a larger diameter than the fitting hole 133. Following the outer diameter of the member 5, contact is made on the entire inner peripheral surface of the fitting hole 133, and the contact area can be increased. At this time, since the conical wall portions 131 and 131 of the seal portions 13 and 13 are connected to the outer peripheral wall portion 11 at the end face, the bottom wall portions 132 and 132 are within the elastic range and the space portion 141 of the waterproof wall portion 14. -It can move in 141, can absorb the misalignment of the piping member 5, and can follow the attachment state of the piping member 5.
[0023]
The grommet 10 configured as described above is, for example, from the outside of the vehicle compartment behind the front tire in order to pipe the piping member to be piped for a rear seat in a one-box type or minivan type vehicle. It is suitably used for a type of automobile that is piped into the passenger compartment. Therefore, the partition wall 3 in this case is a floor panel, and the waterproof wall portion 14 of the grommet 10 is attached to the floor panel 3 facing downward.
[0024]
When the automobile travels in the rain or on a puddle accumulated by storm, the water splashed by the tires scatters vigorously toward the lower surface side of the floor panel 3. When the splashed water scatters toward the grommet 10, since the automobile is running, the water is applied from the horizontal direction of the grommet 10, hits the waterproof wall 14 and is bounced back and falls. A part of the splashed water may reach the seal portion 13, but since the water once hits the waterproof wall portion 14, the momentum decreases and reaches the seal portion 13. It will be. Since the seal surface is fitted to the piping member 5 by surface contact, the water without momentum passes through the seal portion 13 and accumulates outside the vehicle compartment and falls to the ground.
[0025]
Therefore, according to the grommet 10 of the said form, the following effect can be achieved.
[0026]
That is, since the waterproof wall portion 14 is disposed so as to surround the pair of seal portions 13A and 13B that seal the piping member 5 around the seal portions 13A and 13B, the water splashed toward the seal portion 13 is sealed in the seal portion 13A. -It can defend with the waterproof wall part 14 so that it may not reach 13B, and can prevent permeation of the water into the vehicle interior.
[0027]
Moreover, since the end surface of the waterproof wall portion 14 is formed so as to protrude downward from the lower end surface of the bottom wall portion 132 of the seal portion 13, the water splashing on the grommet 10 is more difficult to reach the seal portions 13A and 13B. Become.
[0028]
In addition, since the waterproof wall portion 14 linearly extends downward from the lip portion 12, when the grommet 10 is molded, undercutting is performed when the grommet 10 is punched along the axis. Since it does not occur, die cutting can be performed easily. It is possible to maintain the sealing performance without damaging the product without damaging the product because the die can be easily removed without being forcibly removed.
[0029]
Further, since the sealing portion 13 is fitted to the piping member 5 by surface contact, the sealing performance can be improved with respect to fitting by line contact. Even if it reaches 13, the vehicle can be prevented from entering the vehicle compartment from the outside.
[0032]
Moreover, as another form, you may form the front-end | tip part of the waterproof wall part 14 shown in FIG. 2 in the taper part which inclines inside, and can also form the taper part which inclines outside.
[0033]
Further, in order to pipe this grommet to an air conditioning unit for a front seat in an automobile, a piping member that passes through a front panel (dashboard) that partitions the engine room and the vehicle interior may be sealed.
[0034]
In this case, the piping member may be a refrigerant piping member that circulates the refrigerant, or may be a heater pipe that is piped for heat transport from the engine to the heater core.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a grommet according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the grommet in FIG.
3 is a plan view of the grommet in FIG. 1. FIG.
4 is a cross-sectional view showing a state where the grommet of FIG. 1 is mounted on a vehicle.
FIG. 5 is a partially enlarged sectional view showing a seal portion.
FIG. 6 is a cross-sectional view showing another form of grommet.
FIG. 7 is a cross-sectional view showing a state in which a conventional grommet is mounted on a vehicle.
[Explanation of symbols]
3 Partition wall 3a Grommet mounting hole 5 Piping member 10 Grommet 11 Outer peripheral wall portion 12 Lip portion 13 Seal portion 133 Fitting portion 14 Waterproof wall portion 141 Space portion

Claims (2)

A pipe seal member that seals a pipe member that pipes through the vehicle interior and the exterior of the vehicle,
An oval lip portion that is attached to a partition wall that partitions the vehicle interior and the vehicle exterior, a pair of cylindrical outer peripheral wall portions that protrude from the lip portion toward the vehicle interior side, and the piping member A pressure-contactable seal portion, and a waterproof wall portion connected to the lip portion and disposed so as to surround the seal portion from the outside of the passenger compartment .
The seal portion is connected to the end portion of the outer peripheral wall portion and connected to the end portion of the conical cylindrical wall portion, and a thin conical cylindrical wall portion extending toward the outer side of the passenger compartment. And a bottom wall portion having a fitting hole for fitting the piping member, and formed on each of the pair of outer peripheral wall portions,
The waterproof wall portion is connected to the lip portion, is formed to stand linearly from the lip portion toward the outside of the passenger compartment, and further includes a pair of space portions and a space so as to surround the seal portion. A piping seal member having a partition wall for partitioning the space portion and formed in an oval shape, and an end surface of the waterproof wall portion protruding from an end surface of the seal portion . The pipe seal member according to claim 1 , wherein the seal member is formed so as to be press-contactable with the pipe member by surface contact .

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