Drain structure of vehicle

Abstract: A dam portion (14) is provided at the front of a cowl top panel (10). A framework forming member (3,6) is connected to a side end of the cowl top panel (10). An opening (18,19) is provided at an upper surface of the framework forming member (3,6) such as to communicate with the dam portion (14). A space (5) defined by the framework forming member (3,6) has a closed section. Liquid introduced onto the upper surface of the cowl top panel (10) flows along the dam portion (14) and through the opening (18,19) sequentially, and reaches the space (5).

Description: The present invention relates to a drain structure of a vehicle, and more particularly, to a drain structure of a body of a vehicle to which rainwater or the like is prone to be introduced. Japanese Utility Model Registration Application Laid-open No. H2-108636 discloses a structure for leading rainwater introduced to a so-called cowl box toward a dash side panel through a drain portion disposed between a hood ridge reinforce and the dash side panel, and dropping the rainwater. However, if the structure for leading the rainwater to the dash side panel and dropping the rainwater is employed, and when the rainwater reaching around a front door hinge freezes at a low temperature, the opening and closing movements of the front door may be hindered. It seems possible to weld another drain member at an appropriate position of the dash side panel in order to once collect the rainwater drained from the drain portion provided between the hood ridge reinforce and the dash side panel and then, to let the rainwater drop from the drain member such as to separate the rainwater from the front door hinge. However, according to such a structure to provide the drain member, the number of parts is increased and the design is complicated, the weight and the cost are increased, and the assembling operation in the mass production line is complicated. Therefore, a drain structure is desired in which liquid such as rainwater introduced to an upper wall surface or the like of the cowl box supporting a front window glass of a vehicle can drain in a manner that does not trouble the movement of a movable part such as the front door, without using the other part such as the drain member. JP-A-03-125675 discloses a drain structure according to the preamble of claim 1. The present invention provides a drain structure as set forth in claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic perspective view of a drain structure of a front body of a vehicle according to an embodiment of the present invention; Fig. 2 is an enlarged perspective view of a portion A in Fig. 1; Fig. 3 is a sectional view taken along the line B-B in Fig. 1; Fig. 4 is a sectional view taken along the line C-C in Fig. 1; and Fig. 5 is a sectional view taken along the line D-D in Fig. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be explained in detail with reference to the drawings below. In Fig. 1, FR represents the front direction of a body of a vehicle, 1 represents a hood ridge reinforce as a framework forming member, i.e., a body upper side edge framework member continuously connected to a side end of a cowl box 2 which is a box member. The hood ridge reinforce 1 is formed such as to be divided into front and rear hood ridge reinforces 3 and 6. The front hood ridge reinforce 3 forms a space portion 5 having a closed section between the front hood ridge reinforce 3 itself and a hood ridge upper panel 4, and the rear hood ridge reinforce 6 forms a space portion 5 having a closed section between the rear hood ridge reinforce 6 itself and a cowl top side panel 7 (see Figs. 4 and 5). That is, the front half portion of the hood ridge reinforce 1 forms the body upper side edge framework member, and the rear half portion of the hood ridge reinforce 1 forms the body upper side edge framework member together with the cowl top side panel 7. An upper end of a hood ridge lower panel 8 is jointed to the hood ridge upper panel 4 and the cowl top side panel 7 such as to extend over these two panels 4 and 7. As shown in Fig. 3, the cowl box 2 forms a space portion 13 having a closed section in corporation with a cowl top panel 10, a dash upper panel 11 and a cowl lower panel 12, and the space portion 13 is disposed so as to cross the space portion 5 at the side of the hood ridge reinforce 1 substantially at a right angle with the space portion 5. A front end of the cowl top panel 10 is extended forward beyond the dash upper panel 11, and a tip end of the extended portion 10a of the cowl top panel 10 is bent upward such as to form a flange 14 as a dam portion. A side edge of the extended portion 10a is jointed to an upper wall 7a of the cowl top side panel 7. A seal member 15 is attached to the flange 14 of the cowl top panel 10 such that the seal member 15 is tightly contacted with a rear end of a front hood 21. The extended portion 10a of the cowl top panel 10 is formed with an inclining portion 10b, and a lower end of the front window glass 17 is adhered and fixed to the inclining portion 10b. Upper end joint flanges 16, 16 respectively of the rear hood ridge reinforce 6 and the cowl top side panel 7 are extended in the longitudinal direction( forward/rearward direction) of the body at the side of the cowl box 2, and its rear end is located rearward of the flange 14 of the cowl top panel 10 and its front end is extended forward beyond the flange 14 of the cowl top panel 10. The upper end joint flange 16 of the cowl top side panel 7 is also provided as a guide portion. As shown in Fig. 2, a recess 18 formed using a step portion is formed on the upper wall 7a of the cowl top side panel 7 at a position extending from a front end of the upper wall 7a to a slightly rear portion of the flange 14 of the cowl top panel 10, and an opening 19 is formed at a gap portion of a join position between the cowl top side panel 7 and the front hood ridge reinforce 3. Further, as shown in Figs. 1 and 5, a lower end joint flange 3a of the front hood ridge reinforce 3 is partially offset from a lower end joint flange 4a of the hood ridge upper panel 4, and a pair of front and rear drain openings 20 are formed in front end portions of the space portion 5. Since the present embodiment has the above-described structure, liquid such as rainwater flowing down the front window glass 17 flows on the extended portion 10a sideways the body while being dammed by the flange 14 of the cowl top panel 10. When the liquid reaches the upper wall 7a of the cowl top side panel 7, the liquid is dammed by the flange 14 and is guided by the upper end joint flange 16 of the cowl top side panel 7 and flows into the recess 18. And then the liquid drops from the opening 19 into the space portion 5. The dropped liquid flows forward on a bottom wall 4b of the hood ridge upper panel 4, and drops outward from the front and rear drain openings 20. According to the present embodiment, since liquid such as rainwater flows into the hood ridge reinforce 1 at the right and left sides of the cowl top panel 10, it is possible to omit a drain member which is conventionally provided on the dash side panel, and therefore the number of parts and the number of assembling steps are reduced, which is advantageous in terms of the costs. Since the conventionally provided flanges are utilized as the flanges 14 and 16 for damming and guiding the liquid such as rainwater, the costs can further be reduced. Further, since the rainwater flowing out from the cowl top panel 10 is dammed and guided by the upper end joint flange 16 of the cowl top side panel 7 and flows into the opening 19, the rainwater dose not flow on and drop from the rear hood ridge reinforce 6. Furthermore, since the cowl top side panel 7 is formed with the recess 18, and the joint portion between the front hood ridge reinforce 3 and the cowl top side panel 7 is formed with the opening 19, the number of drilling steps can be reduced, the opening 19 can not easily be seen at the time of maintenance of the engine and thus, an outward appearance of the body in such a case is enhanced. Although the present invention has been described based on the vehicle of a type in which the cowl top panel 10 is extended forward and the lower end of the front window glass 17 is supported by the panel 10, the present invention should not be limited to the vehicle of this type only, and the invention is also applicable to a vehicle of a type in which the cowl top panel is not extended. The invention is also applicable to a vehicle in which the hood ridge reinforce 1 is not divided in front and rear portions but is integrally formed. Although the invention has been described above by reference to a certain embodiment of the invention, the invention is not limited to the embodiment described above. Modifications and variations of the embodiment described above will occur to those skilled in the art, in light of the teachings. The scope of the invention is defined with reference to the following claims.

Claims: A drain structure of a vehicle, comprising: a cowl top panel (10); a dam portion (14) provided at the front of the cowl top panel (10); and communicating means (19) for bringing liquid introduced into the drain structure and dammed by the dam portion (14), and thereby caused to move sideways, into communication with a -space (5) defined by use of a framework forming member (1) of a body of the vehicle and having a closed section; wherein the liquid flows from the dam portion (14) to the said communicating means (19) and reaches the said space (5) through the said communicating means (19); characterised in that the dam portion is a flange (14) which extends upward and is formed on the front end of the cowl top panel (10). A drain structure according to claim 1, wherein the said communicating means comprises an opening (19) which opens into the said space (5). A drain structure according to claim 2, wherein a guide portion (16) guiding the liquid to the said opening (19) in the longitudinal direction thereof is provided at the side of the cowl top panel (10), a front end of the guide portion (16) preferably being located forward of the dam portion flange (14), a rear end of the guide portion (16) preferably being located rearward of the dam portion flange (14). A drain structure according to claim 3, wherein a front end of the guide portion (16) communicates with the said opening (19). A drain structure according to claim 3 or 4, wherein the guide portion comprises an upwardly extending flange (16) formed by use of a cowl top side panel (7) forming part of the framework forming member (1). A drain structure according to any preceding claim, wherein the-said opening (19) comprises a gap formed between a cowl top side panel (7) forming part of the framework forming member (1), and a hood ridge reinforce (3) in front of the said cowl top side panel (7). A drain structure according to any preceding claim, wherein the said opening (19) is located forward of the dam portion flange (14). A drain structure according to any preceding claim, wherein a step portion having a downwardly changing surface is formed between the dam portion flange (14) and the said opening (19). , A drain structure according to claim 8, wherein the step portion is formed such that an upper surface (7a) of a cowl top side panel (7) forming part of the framework forming member (1) has a recess (18), a front end of the recess (18) preferably being located forward of the dam portion flange (14), a rear end of the recess (18) preferably being located rearward of the dam portion flange (14). A drain structure according to claim 9, wherein a front end of the recess (18) communicates with the said opening (19). A drain structure according to claim 9 or 10, wherein a guide portion (16) guiding the liquid to the said opening (19) is provided at a side end of the recess (18). A drain structure according to any preceding claim, wherein the liquid introduced into the said space (5) is guided forward within the space (5) and is discharged from the space (5). A drain structure according to any preceding claim, wherein the said space (5) is further defined by a cowl top side panel (7) forming part of the framework forming member (1).

Inventors: KUWANO YASUNARI, KUWANO, YASUNARI
Applicants: NISSAN MOTOR, NISSAN MOTOR CO., LTD.
Application year: 1999
Main classification: B62D25
IPC codes: B62D25, B60R13