JP4771806B2 - Automobile hood seal structure - Google Patents

Description

The present invention relates to a hood seal structure for an automobile, and more particularly, hood elongated uniform cross-sectional shape vehicle is disposed on the rear surface of the hood seals in elastic contact with the hood closed to the other side member of the engine room side the present invention relates to an automobile hood seal structure using a seal rubber.

  For example, as shown in FIG. 3, in addition to the seal rubber at the cowl top portion of the automobile or at the front end of the hood 1, for example, the seal rubber on the back surface (hood inner panel 1 a) of the hood 1 at the rear side of the seal rubber at the front end of the hood 1. 11 is disposed along the vehicle width direction, and when the hood 1 is closed, the seal rubber 11 is elastically brought into contact with a mating member 20 such as a radiator core support in the engine room to prevent hot air from blowing back from the engine room. Such a technique is proposed in Patent Document 1 and the like.

  As such many conventional hood seal rubbers 11, as shown in FIGS. 4 to 6, a type that is extruded into a uniform sectional shape so as to include a mounting base portion 11 a and a seal lip 11 b is used. The plurality of clips, not shown, are fixed to the hood inner panel 1a.

4 is a cross-sectional view of the hood seal rubber 11 corresponding to the hood seal rubber 11 shown in FIG. 3 when the hood 1 is closed. As shown in FIG. 4, the seal lip 1b of the hood seal rubber 11 is elastically contacted when the hood 1 is closed. The shape-changing part such as a recessed part 1d by drawing other than the general part 1c in which the shape of the mating member 20 is constant while the shape of the hood inner panel 1a itself is relatively constant. If at least the recessed portion 1d has at least the concave portion 1d, the attachment base portion 11a of the hood seal rubber 11 cannot be seated on the hood inner panel 1a, and a gap is generated. Conventionally, as a countermeasure, a portion of the hood seal rubber 11 corresponding to the concave portion 1d, more specifically, a portion of the hood seal rubber 11 corresponding to the concave portion 1d as shown in FIGS. An ultra-soft sponge-like sealing material 12 called “epto-seal” or the like is attached to the back side of the mounting base 11a.
[Patent Document 1] JP-A-7-205842

  However, in the conventional technology as described above, since the sealing material 12 has to be separately attached after the hood seal rubber 11 is extruded, the number of work steps is increased together with the number of parts, and the cost is inevitably increased. It is not preferable.

The present invention has been made paying attention to such a problem, and in particular, an object of the present invention is to provide a hood seal structure for automobiles that eliminates the need for attaching another sealing material as described above and reduces costs. .

According to the first aspect of the present invention, a long hood seal rubber having a uniform cross-sectional shape is disposed on the back surface of the hood, and the hood seal rubber is elastically contacted with a mating member on the engine room side when the hood is closed. A hood seal structure for an automobile, wherein the hood seal rubber includes a long plate-like attachment base and the attachment base at a distal end of an intermediate leg extending obliquely from one end in the width direction of the attachment base. A substantially lip-shaped seal lip formed by projecting a cantilever lip toward the other end in the width direction . In addition, a notch for facilitating the deformation behavior of the entire seal lip with respect to the mounting base is formed at the base of the middle leg with respect to the mounting base, and in the vicinity of the base of the middle leg with respect to the mounting base. In addition, a sub-lip extending obliquely toward the anti-attachment base side is also formed at the position on the anti-attachment base side of the notch . On the other hand, the hood inner panel to which the hood seal rubber is attached has a general part and a shape change part that is one step deeper than that in the hood seal rubber arrangement direction. By fixing to the inner panel, the mounting base is seated on the hood inner panel. When the hood is closed, the seal lip is elastically contacted with the mating member and the sub lip is elastically contacted with the hood inner panel. In this case, the mounting base is not seated on the hood inner panel, and when the hood is closed, the seal lip is elastically contacted with the mating member and the sub lip is elastically contacted with the hood inner panel .

  In this case, in order to ensure a substantially constant bending allowance of the seal lip with respect to the counterpart member without being affected by the shape change on the back side of the hood, as described in claim 2, the cantilever lip is Desirably, the cantilever lip is formed as a circular arc having a convex shape toward the side opposite to the attachment base, and more preferably, the cantilever lip is a starting point of deformation of the seal lip. It shall be formed as a circular arc shape having a radius from the notch part to the tip of the middle leg part.

  Further, in order to prevent the so-called rolling phenomenon of the mounting base and the entire hood seal lip due to the shape change on the back side of the hood, as described in claim 4, the mounting base is harder than the other parts. It is desirable that it is made of a material.

Therefore, in at least the invention according to claim 1, while the shape of the mating member is substantially constant, a part of the hood inner panel which is the back surface of the hood has a shape change portion such as a concave portion. If the hood seal rubber is installed along the vehicle width direction of the hood inner panel using a clip or the like, for example, in the same manner as before, the seal lip is almost evenly attached to the mating member when the hood is closed. Of course, in the part corresponding to the general part of the hood inner panel, the mounting base and the sub lip are both seated or elastically contacted with the hood inner panel, while in the part corresponding to the shape change part on the hood inner panel side, As the seal lip is elastically contacted with the mating member, the entire seal lip is deformed starting from the notch, so the mounting base is the hood inner panel. And al spaced apart from each other have also sub-lip is made to be in contact with the bullet in the hood inner panel. As a result, there is no gap between the hood inner panel and the hood seal rubber in the part corresponding to the shape change part on the hood inner panel side, and the pasting of another sealing material that has been required in the past Can be abolished.

According to the first aspect of the present invention, when the rear surface of the hood to which the hood seal rubber is to be attached has the shape change portion, the hood and the hood seal are also provided in the portion corresponding to the shape change portion. Since there is no gap between the rubber and the rubber, the original sealing effect can be fully exhibited, as well as improved wind sealing and sound insulation. Since the sticking of the sealing material can be abolished, the manufacturing cost can be reduced.

  In addition, in the portion corresponding to the general portion on the back surface of the hood other than the shape changing portion, not only the mounting base portion but also the sub lip is elastically contacted, but unlike the portion corresponding to the shape changing portion, the notch portion is the starting point Since bending deformation of the seal lip does not occur, it is possible to prevent the mounting base from lifting from the back surface of the hood, and it is not necessary to increase the number of clips or the like as fixing means for preventing the lifting.

  According to the invention described in claim 2, when the hood is closed, it is possible to ensure substantially the same seal lip deflection amount regardless of whether it is a general part equivalent part or a shape change part equivalent part on the back surface of the hood. The sealing performance can be stabilized. In particular, according to the invention described in claim 3, the above effect becomes more remarkable.

  According to the invention described in claim 4, when the hood is closed, the attachment base portion is lifted from the hood inner panel at the portion corresponding to the shape change portion on the back surface of the hood. The lip does not cause a so-called rolling phenomenon, and there is an effect that the lip can be uniformly sealed with substantially the same amount of deflection as the general portion equivalent portion.

  FIG. 1 is a view showing a more specific embodiment of the hood seal rubber according to the present invention, and is a sectional view of the hood seal rubber 2 alone in a free state. As shown in FIGS. 3 to 5, the hood seal rubber 2 has a hood inner panel 1 a on the back surface of the hood 1 and a shape changing portion such as a general portion 1 c and a concave portion 1 d that is one step deeper than the general portion 1 c. When the hood 1 is closed, it comes into elastic contact with the mating member 20 such as a radiator core support in the engine room.

  As shown in FIG. 3, the hood seal rubber 2 is disposed on the hood inner panel 1a along the vehicle width direction on the back surface of the hood 1, and is extruded with a uniform cross-sectional shape as shown in FIG. Of long strips.

  As shown in FIG. 1, the hood seal rubber 2 has a long plate-like mounting base 3 that functions as a mounting portion for the hood inner panel 1a, and a substantially deformed body integrally formed with the mounting base 3. A U-shaped seal lip 4 and a sub lip 7 formed integrally with a part of the seal lip 4 are provided. The mounting base 3 is formed to be harder than the seal lip 4 and the sub lip 7. For example, when the seal lip 4 and the sub lip 7 are formed of a soft rubber material, the mounting base 3 is formed of a hard rubber material. Is formed.

  More specifically, the middle leg 5 extending obliquely from one end in the width direction of the mounting base 3 is integrally formed, and a circle is formed at the tip of the middle leg 5 toward the other end in the width direction of the mounting base 3. An arc-shaped cantilever lip 6 is integrally formed to project, and the middle leg portion 5 and the cantilever lip 6 form a substantially deformed U-shaped seal lip 4.

  And the notch part 8 used as the starting point (fulcrum) of the bending deformation behavior of the middle leg part 5 with respect to the attachment base 3, and by extension, the seal lip 4 whole is formed in the base part of the middle leg part 5 with respect to the said attachment base part 3. . Thus, the seal lip 4 has a structure that can be easily bent and deformed with respect to the mounting base 3 starting from the notch 8.

  Here, the cantilever lip 6 has an arc shape with a predetermined curvature so as to be convex toward the side opposite to the attachment base 3, and the shape on the seal surface 6 a side which is the outermost peripheral surface of the cantilever lip 6 is first. The length from the deepest part of the notch part 8 to the sealing surface 6a (the length from the deepest part of the notch part 8 to the tip of the middle leg part 5) R is formed in an arc shape having a radius.

  On the other hand, the sub lip 7 is formed so as to protrude obliquely from the position on the side opposite to the mounting base 3 to the side opposite to the mounting base 3 than the notch 8 near the base of the middle leg 5 with respect to the mounting base 3. is there. The sub lip 7 is set so as to be thinner and less rigid than the mounting base 3, and the tip of the sub lip 7 protrudes above the upper surface of the mounting base 3 in FIG. 1.

  A plurality of mounting holes 9 are formed in the mounting base 3 at a predetermined pitch along the longitudinal direction thereof (see FIG. 2A). As shown in FIG. 4, a concave shape is formed in the hood inner panel 1a. The general portion 1c excluding the portion 1d is fixed using a plurality of clips 10 as fixing means.

  Here, FIG. 2 is a cross-sectional view when the hood seal rubber 2 of FIG. 1 is applied to the hood of FIGS. 3 and 4, and FIG. FIG. 4B shows a cross-sectional view corresponding to the cross section taken along line BB in FIG.

  Therefore, according to the hood seal rubber 2 configured as described above, in the portion corresponding to the general portion 1c of the hood inner panel 1a shown in FIG. The sub lip 7 is also elastically contacted with the hood inner panel 1a because of the restraining force accompanying the seating of the mounting base 3 against the hood inner panel 1a. ing. Note that the phantom line P1 in FIG. 2A shows a shape in a free state similar to FIG.

  When the hood 1 is closed, the mounting base 3 and the sub lip 7 are both seated or elastically contacted with the hood inner panel 1a as shown in FIG. The seal lip 4 is bent and deformed by the elastic force of the middle leg portion 5 and the cantilever lip 6 itself, and the seal surface 6a of the cantilever lip 6 is elastically contacted with the mating member 20 for sealing. .

  On the other hand, in the portion corresponding to the concave portion 1d of the hood inner panel 1a shown in FIG. 4, the mounting base 3 floats from the hood inner panel 1a as shown in FIG. As indicated by P2, not only the mounting base 3 but also the sub lip 7 floats from the hood inner panel 1a, and a gap is formed between the hood seal rubber 2 and the hood inner panel 1a.

On the other hand, when the hood is closed, the sub lip 7 rises and elastically contacts the hood inner panel 1a as shown by the solid line in FIG. That is, as shown in the figure, when the cantilever lip 6 comes into elastic contact with the mating member 20 when the hood 1 is closed, the entire seal lip 4 including not only the cantilever lip 6 but also the middle leg 5 starts from the notch 8. The cantilever lip 6 is displaced in the left direction as indicated by reference numeral P3 in FIG. Along with this, the sub lip 7 integral with the middle leg 5 rises and comes into elastic contact with the hood inner panel 1a. Since the mounting base 3 is made of a hard material and has sufficient rigidity, the hood seal rubber 2 does not cause a so-called falling phenomenon even if the mounting base 3 floats from the hood inner panel 1a. The self-holding state of the solid line in FIG.

  Thus, when the hood 1 is closed, the attachment base 3 and the sub lip 7 are both seated or elastically contacted with the hood inner panel 1a as shown in FIG. 2A in the portion corresponding to the general portion 1c shown in FIG. In the portion corresponding to the concave portion 1d, the mounting base 3 floats from the hood inner panel 1a as shown in FIG. 5B, but the sub lip 7 stands up and elastically contacts the hood inner panel 1a. In the portion corresponding to the concave portion 1d, no gap is generated as in the prior art, and it is surely sealed regardless of whether it is a portion corresponding to the general portion 1c or a portion corresponding to the concave portion 1d. In addition, it is not necessary to attach another sealing material as in the prior art. In addition, the improvement of the sealing performance by the hood seal rubber 2 can not only reliably prevent the hot air from blowing back from the engine room side, which is the original purpose, but also has a sealing performance and a sound insulation performance against the traveling wind. To improve.

  Here, since the mounting base 3 is hardened to have sufficient rigidity, the mounting base 3 corresponds to the general portion 1c even in the portion corresponding to the concave portion 1d as shown in FIG. The mounting base 3 at the same level as the mounting base 3 in the portion to be attached, and even if the hood 1 is closed, the mounting base 3 at the portion corresponding to the concave portion 1d does not cause a so-called falling phenomenon, and its position and posture change at all. do not do. Therefore, regardless of whether the portion corresponds to the general portion 1c or the portion corresponding to the concave portion 1d, the seal lip 4 can seal almost uniformly.

  Further, since the shape of the seal surface 6a of the cantilever lip 6 in the seal lip 4 is formed as an arc shape with the radius R as the length of the middle leg portion 5 starting from the notch portion 8, FIG. As can be seen by comparing (A) and (B), the cantilevered lip 6 is almost the same even if the tilt angle of the seal lip 4 is different between the portion corresponding to the general portion 1c and the portion corresponding to the concave portion 1d. 2 can be elastically contacted with the counterpart member 20, and both (A) and (B) of FIG. 2 correspond to the same amount of deflection, that is, the amount of deflection a1 in the portion corresponding to the general portion 1c and the concave portion 1d. It is possible to make the deflection amount b1 at the portion to be substantially uniform by setting a1≈b1.

  Moreover, as shown in FIG. 2B, even if the sub lip 7 is elastically contacted with the hood inner panel 1a at the portion corresponding to the concave portion 1d when the hood 1 is closed, as shown in FIG. There is no change in the bending state of the sub lip 7 in the portion corresponding to the portion 1c, and the force to lift the mounting base 3 from the hood inner panel 1a does not increase at least in the portion corresponding to the general portion 1c. Therefore, it is not necessary to increase the number of clips in order to prevent the attachment base 3 from being lifted at a portion corresponding to the general portion 1c.

Sectional drawing in the free state of the hood seal rubber which concerns on this invention. FIG. 5 is a cross-sectional view of the hood with the hood seal rubber of FIG. 1 in a closed state, in which (A) is a cross-sectional view corresponding to the cross-section along line AA in FIG. 4 and (B) is a cross-sectional view along line BB in FIG. Sectional drawing equivalent to a cross section. The front perspective view which shows the open state of the food | hood of the motor vehicle provided with the conventional hood seal rubber. FIG. 4 is a cross-sectional explanatory view of a main part when the hood is closed along the hood seal rubber of FIG. 3. Sectional drawing which follows the BB line of FIG. The principal part perspective view of the hood seal rubber shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hood 1a ... Hood inner panel 1c ... General part 1d ... Concave part (shape change part)
2 ... Hood seal rubber 3 ... Mounting base 4 ... Seal lip 5 ... Middle leg 6 ... Cantilever lip 7 ... Sub lip 8 ... Notch 10 ... Clip (fixing means)
20 ... Mating member

Claims (4)

By arranging a long hood seal rubber uniform cross-sectional shape on the back surface of the hood, the hood seal rubber hood closed by elastic contact on the mating member of the engine room side of an automobile so as to seal hood seal structure Because
The above hood seal rubber
A long plate-like mounting base;
A substantially lip-shaped seal lip formed by projecting a cantilever lip toward the other end in the width direction of the mounting base at the tip of the middle leg extending obliquely from one end in the width direction of the mounting base; ,
With
At the base portion of the middle leg portion with respect to the mounting base, a notch portion is formed to facilitate the deformation behavior of the entire seal lip with respect to the mounting base,
A sub lip that protrudes obliquely toward the anti-attachment base side is formed in the vicinity of the base part of the middle leg portion with respect to the attachment base and at a position on the anti-attachment base side than the notch part ,
On the other hand, the hood inner panel to which the hood seal rubber is attached has a general part and a shape change part that is one step deeper than that in the hood seal rubber arrangement direction,
In the above general part, the mounting base is fixed to the hood inner panel using a fixing means, so that the mounting base is seated on the hood inner panel.When the hood is closed, the seal lip is used as the mating member and the sub lip is used as the hood inner panel. While it ’s designed to be elastic,
Without seating the mounting base to the hood inner panel in the shape changing portion, a sealing lip on a mating member in the hood closed, the motor vehicle, characterized in that it is constituted such that it is respectively elastic contact with the sub-lip in the hood inner panel Food Seal structure. The cantilever lip of the hood seal rubber is an automobile hood seal structure according to claim 1, characterized in that is formed as an arc shape with a convex shape toward the non mounting base side. The cantilever lip in the hood seal rubber is formed as an arc shape having a radius from a notch portion that is a starting point of deformation of the seal lip to a tip end of a middle leg portion. automobile hood seal structure according to 2. Automobile hood seal structure according to any one of claims 1 to 3, characterized in that is formed with the mounting base portion in the hood seal rubber of a hard material than other portions.

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