JP2022185458A - cowl top garnish - Google Patents

Abstract

To provide a cowl top garnish that makes it easy to fit a windshield.SOLUTION: A cowl top garnish includes: a main body plate 11 fixed to a vehicle along a vehicle width direction; a support wall 12 extending along the vehicle width direction, which is parallel to the main body plate 11 by bending at substantially right angles after branching from a rear surface of the main body plate 11; a fitting groove 13 having a U-shaped cross section formed by the main body plate 11 and the support wall 12, and making a lower-end side of a windshield 50 fit in a U-shape; a dummy bottom surface 14a by which a groove bottom surface 12a of the fitting groove 13 is extended toward a lower rear side of the vehicle from the support wall 12; a dummy wall 14b extending upward over the entire area in the vehicle width direction at a rear edge of the dummy bottom surface 14a; and an extra thick portion 16 provided at a connecting corner between the support wall 12 and the dummy bottom surface 14a.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cowl top garnish that supports the windshield of a vehicle.

A cowl top garnish is a decorative panel that is fixed along the vehicle width direction to the rear end of the engine compartment of the vehicle. An edge side along the vehicle width direction of the cowl top garnish is formed with a fitting groove for supporting the windshield from below. The fitting groove has a U-shaped cross section formed by a support wall branched from the main body plate and the main body plate to sandwich the windshield.

It is not easy to create a cooling channel in the mold for injection-molding the cowl top garnish in the inner groove portion of the fitting groove having such a U-shaped cross section, and it is costly to create it. . Therefore, in the cooling process of injection molding, since the entire inset groove is cooled by the cooling water passages arranged in the mold outside the groove of the inset groove, the inside of the groove is cooled compared to the outside of the groove. Hard to cool.

As a result, in the cooling process, a difference in shrinkage occurs due to the temperature difference between the inside and outside of the inset groove, and the two wall surfaces forming the inlay groove are deformed to fall inward. Since such inward deformation hinders fitting of the windshield into the fitting groove, conventionally, ribs are provided on the inside and outside of the U-shaped cross section of the fitting groove to prevent inward deformation.
In addition, a drainage hole is provided in the indented groove to discharge the liquid that has entered the indented groove to a proper place so that the liquid that has entered the indented groove does not overflow and the parts arranged in the lower part of the indented groove do not get wet. is provided.

JP-A-6-15703

However, when the rib is provided inside the fitting groove as described above, there is a problem that the design surface is wavy due to the local rigidity difference, and the design property is deteriorated.
Further, depending on the positional relationship between the rib and the drain hole, the flow of the liquid may be obstructed by the rib and the liquid may not be discharged from the intended location.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cowl top garnish into which a windshield can be easily fitted.

The cowl top garnish according to the present invention includes a body plate fixed to the vehicle along the vehicle width direction, and the vehicle width direction that is parallel to the body plate after being branched from the back surface of the body plate and bent at a substantially right angle. a support wall extending along the main body plate and the support wall; a dummy bottom surface that extends the groove bottom surface of the fitting groove to the vehicle lower rear side than the support wall; a dummy wall that rises from a rear edge of the dummy bottom surface over the entire vehicle width direction; and the support wall and the dummy bottom surface. and a thin portion provided at the connecting corner portion of the.

The present invention provides a cowl top garnish to which a windshield can be easily fitted.

1 is a schematic perspective view of a configuration around a cowl top garnish of a vehicle provided with the cowl top garnish according to the embodiment; FIG. FIG. 2 is a cross-sectional view of the cowl top garnish according to the embodiment taken along line II of FIG. 1; (A) to (C) are top views of the resin model simulating the cowl top garnish according to the embodiment, showing analysis results of the temperature distribution after a predetermined time has elapsed from the start of cooling of the resin model. (A) to (C) Perspective views of resin models showing the results of warp analysis by flow analysis of resin models simulating the cowl top garnish according to the embodiment, (D) to (F) Fig. 4 (A) to (C) ) is a cross-sectional view of a resin model.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
In the following embodiments, the "up" or "down" orientation of each component is defined by the orientation when the component is attached to the vehicle. For example, the "lower edge" of the windshield refers to the edge on the lower side when the windshield is mounted on the vehicle.

FIG. 1 is a schematic perspective view of a configuration around a garnish 10 of a vehicle 100 provided with a cowl top garnish (hereinafter simply referred to as "garnish") 10 according to an embodiment. In FIG. 1, various parts that are not in contact with the garnish 10, such as side doors, a roof, and the lower portion of the vehicle body, are omitted.

Garnish 10 is a plate member made of resin that extends in the vehicle width direction and is fixed to vehicle 100 at the boundary between windshield 50 and engine hood 60 , as shown in FIG. 1 . The garnish 10 mainly plays a role of preventing liquid such as rainwater running along the windshield 50 from entering the engine room. A wiper 70 is provided on the design surface side of the body plate 11 of the garnish 10 .

FIG. 2 is a cross-sectional view of the garnish 10 according to the embodiment taken along line II of FIG.
As shown in FIG. 2, a support wall 12 is integrally formed on the rear surface of the garnish 10 opposite to the design surface of the body plate 11 along the longitudinal edge 11a of the body plate 11 on the free end side. .
The support wall 12 extends along the vehicle width direction in a state of being parallel to the body plate 11 after being branched from the back surface of the body plate 11 and bent substantially at a right angle.
Here, "substantially right angle" means a deviation of ±10 degrees from the right angle.

The free edge 11a of the body plate 11 and the support wall 12 form a fitting groove 13 having a U-shaped cross section. The lower end side of the windshield 50 is fitted into the fitting groove 13 . That is, the garnish 10 holds the lower edge of the windshield 50 between the free edge 11a of the main body plate 11 of the fitting groove 13 and the support wall 12, and supports the windshield 50 with the support wall 12 from below the vehicle. .

In addition, in the garnish 10 according to the embodiment, the groove bottom surface 12a of the fitting groove 13 is extended to the lower rear side of the vehicle than the support wall 12 by the dummy bottom surface 14a.
At the rear edge of the dummy bottom surface 14a, the dummy wall 14b stands up over the entire width of the garnish 10. As shown in FIG. With these dummy bottom surface 14a and dummy wall 14b, a dummy portion 14 having an L-shaped cross section is formed behind the support wall 12 in the cross section of the garnish 10 in the transverse direction.
By accumulating heat in the dummy portion 14 , the heat tends to be accumulated in the back portion of the support wall 12 . Therefore, the temperature difference between the inside and outside of the fitting groove 13 on the support wall 12 side is reduced, and the inward deformation of the support wall 12 toward the main body plate 11 side is suppressed.

The dummy wall 14b is provided over the entire area of the garnish 10 in the vehicle width direction. The temperature difference between the inside and outside of the fitting groove 13 is reduced only at the place where the dummy wall 14b is arranged, and the supporting wall 12 is prevented from undulating due to the occurrence of a place where the support wall 12 falls inward and a place where it does not. is.

In addition, it is desirable that the dummy wall 14b be thicker than the support wall 12 in order to retain enough heat to prevent the support wall 12 from collapsing inward on the dummy portion 14 side.
Moreover, it is desirable to design the height of the dummy wall 14b to be 1/3 to 2/3 of the height of the support wall 12. FIG. By designing the height of the dummy wall 14b in this way, it is possible to suppress an increase in the weight of the dummy portion 14 while securing a space for storing sufficient heat near the dummy bottom surface 14a.

In addition, a reduced thickness portion 16 is provided at a connecting corner portion between the support wall 12 and the dummy bottom surface 14a.
Although the cross-sectional shape of the thinned portion 16 is not particularly limited, it is preferable that the thinned portion 16 protrude in an arc shape from the support wall 12 and be connected to the dummy bottom surface 14a. By protruding the thin portion 16 in an arc shape in this way, the volume relative to the surface area of the thin portion 16 can be increased, so that the heat storage capacity of the thin portion 16 is improved. Even if the space that can be occupied by the dummy part 14 is limited, the amount of contraction of the support wall 12 on the side of the dummy part 14 is increased by providing the reduced thickness part 16, so that the inside and outside of the fitting groove 13 are increased. Differential shrinkage that occurs can be reduced.
In this way, by taking various measures to facilitate heat accumulation in the dummy portion 14, the temperature difference between the inside and outside of the fitting groove 13 can be reduced, and the inward deformation of the support wall 12 can be prevented.

3A to 3C are top views of the resin model 18 (18a to 18c) simulating the garnish 10 showing the analysis results of the temperature distribution of the resin model 18 (18a to 18c) after a predetermined time has elapsed from the start of cooling.
In the analysis of this temperature distribution, the finite element method was applied to an analysis model simulating the shape and material of the embedded groove 13 of the garnish 10 .
3(A) is a resin model 18a that simulates only the fitting groove 13 of the garnish 10, FIG. 3(B) is a resin model 18b that further adds a dummy portion 14 to the fitting groove 13, and FIG. 3(C). is a resin model 18c in which the adjustment gap 17 is provided in the support wall 12 of FIG. 3(B).
3A to 3C correspond to the respective members of the garnish 10 simulated by the resin model 18. As shown in FIG.
Moreover, in this analysis, the analysis is performed on the assumption that the cooling water passages are provided only on the outside of both sides of the embedded groove 13 .

In FIGS. 3A to 3C, the darker the color, the higher the temperature and the more difficult it is to cool down.
As can be seen by comparing FIGS. 3A and 3B, the temperature of the fitting groove 13 is slightly higher when the dummy portion 14 is provided. However, it can be seen from FIG. 3B that heat is accumulated in the dummy portion 14 by providing the dummy portion 14 . That is, it can be seen that the temperature difference between the fitting groove 13 and the dummy portion 14 is smaller than when the dummy portion 14 is not provided.
Therefore, the shrinkage that occurs in the cooling process of injection molding occurs substantially equally in the fitting groove 13 and the dummy portion 14, and the inward deformation of the support wall 12 toward the main body plate 11 is suppressed. Recognize.

In addition, as shown in FIG. 3C, it is desirable that a plurality of concave adjustment gaps 17 are provided in the support wall 12 at predetermined intervals in the extending direction.
By providing the adjustment gap 17, as can be seen by comparing FIGS. This is because the temperature difference can be reduced.

It is desirable that the depth of the adjustment gap 17 to the lower end side is deeper than half the height of the support wall 12 and shallower than the height of the support wall 12 .
That is, even when the adjustment gap 17 is provided, by leaving the support wall 12 at the lower end of the adjustment gap 17, the support wall 12 is continuously connected to the entire vehicle width direction, and the rigidity of the entire support wall 12 is increased. can be done.
The support wall 12 supports the windshield 50 at the lower edge of the windshield 50 where the load concentrates. Therefore, by leaving the supporting wall 12 covering the entire area of the garnish 10 in the vehicle width direction, the mounting rigidity of the windshield 50 can be ensured.

FIGS. 4A to 4C are perspective views of the resin model 18 (18d to 18f) showing the results of warpage analysis by flow analysis of the resin model 18 (18d to 18f) simulating the garnish 10. FIG. 4D to 4F are sectional views of the resin model 18 (18d to 18f) in FIGS. 4A to 4C in order.
Reference numerals in FIGS. 4A to 4F correspond to the reference numerals of the members of the garnish 10 simulated by the resin model 18. FIG.
In this flow analysis, an analytical model simulating the garnish 10 was used to calculate warpage deformation occurring in this analytical model by the finite element method. MOLDFLOW (registered trademark) marketed by Autodesk, Inc. was used for injection, holding pressure, gate, injection pressure, warpage analysis, and flow analysis.

4A and 4D show a resin model 18d that simulates only the fitting groove 13 of the garnish 10, and FIGS. A model 18e, FIGS. 4(C) and (F) is a resin model 18f in which an adjustment gap 17 is provided in the support wall 12 of FIG. 4(B).
In FIGS. 4A to 4F, the lighter the color, the greater the inward collapse deformation.
In addition, in FIGS. 4A to 4F, the deformation scale of the warp deformation is enlarged twice.
4(D) to 4(F), the free edge 11a of the body plate 11 is aligned with the dashed line α so as to facilitate comparison of the amount of warp deformation, and the edge of the support wall 12 in FIG. A dashed β line is shown as a reference line.

Comparing FIGS. 4A, 4D and 4B, 4E, it can be seen that by providing the dummy portion 14 in the fitting groove 13, the amount of warp deformation of the support wall 12 is reduced. can be read.
4(B) and (E) and FIGS. 4(C) and (F) are compared, it can be read that the amount of warp deformation of the support wall 12 is further reduced by providing the adjustment gap 17 .
From the analysis results shown in FIGS. 3(A) to (C) and FIGS. 4(A) to (F), the inward deformation of the support wall 12 can be reduced by providing the dummy portion 14 in the fitting groove 13. It was confirmed that
Further, from this analysis result, it was confirmed that by providing the adjustment gap 17 in the support wall 12, the inward deformation of the support wall 12 is further reduced.

As described above, according to the garnish 10 according to the embodiment, the inward deformation of the support wall 12 into the fitting groove 13 is suppressed, so that the windshield 50 can be easily fitted into the fitting groove 13. be able to.
In addition, since it is not necessary to form a rib inside the fitting groove 13, it is possible to prevent the design surface from being wavy due to a local difference in rigidity, which would impair the aesthetic appearance. Likewise, since no ribs are required, infiltrated liquid can be smoothly drained from the intended location.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention.
These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention.
These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

For example, the shape of the dummy portion is not limited to that illustrated. For example, the connection angle of the dummy wall to the dummy bottom surface is not limited to a right angle. Also, the cross-sectional shape of the dummy wall is not limited to a rectangular shape.

DESCRIPTION OF SYMBOLS 10... Garnish 11 (11a)...Main body plate (longitudinal edge and free edge on free end side) 12 (12a)...Supporting wall (groove bottom surface) 13...Fitting groove 14 (14a, 14b) Dummy portion (dummy bottom surface, dummy wall), 16 thin portion, 17 adjustment gap, 18 (18a to 18f) resin model, 50 windshield, 60 engine hood, 70 wiper, 100 vehicle.

Claims (6)

a body plate fixed to the vehicle along the vehicle width direction;
a support wall that branches off from the back surface of the body plate and then bends at a substantially right angle to extend along the vehicle width direction parallel to the body plate;
a fitting groove having a U-shaped cross section formed by the main body plate and the support wall and into which the lower edge of the windshield is fitted into the U-shaped;
a dummy bottom surface that extends the groove bottom surface of the fitting groove to the vehicle lower rear side than the support wall;
a dummy wall standing over the entire vehicle width direction at the rear edge of the dummy bottom surface;
A cowl top garnish, comprising: a thin portion provided at a joint corner portion between the support wall and the dummy bottom surface. 2. The cowl top garnish according to claim 1, wherein the supporting wall is provided with a plurality of concave adjustment gaps spaced at predetermined intervals in the extending direction. 3. The cowl top garnish according to claim 2, wherein the adjustment gap has a depth to the lower end side that is deeper than half the height of the support wall and shallower than the height of the support wall. The cowl top garnish according to any one of claims 1 to 3, wherein the height of the dummy wall is 1/3 to 2/3 of the height of the support wall. 5. The cowl top garnish according to any one of claims 1 to 4, wherein the cross-sectional shape of the thin portion protrudes in an arc from the support wall and is connected to the dummy bottom surface. The cowl top garnish according to any one of claims 1 to 5, wherein the dummy wall is thicker than the support wall.

Images