JP2016068823A - Cowl top cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cowl top cover which has impact absorption performance against an impact force from above, and can prevent a fall of the cowl top cover from an engagement state engaged with front glass when a pressing force acts on a front side of a vehicle.SOLUTION: A substantially-Y-shaped rib which is expanded to a front side of a vehicle is formed at a rear surface of a protrusion which is formed at a cowl top cover. By the substantially-Y-shaped rib, impact absorption performance against an impact from above can be exerted, and the cowl top cover can be prevented from falling from front glass while withstanding a pressing force to the front side of the vehicle.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cowl top cover that has excellent pedestrian protection performance and prevents falling from a windshield due to weight of snow or the like.
Regarding the front-rear direction, the up-down direction, and the vehicle width direction used in the present invention, the front-rear direction is based on the forward direction in which the vehicle travels straight, and the forward direction of the vehicle is the forward direction. In the vertical direction, the vertical direction is the vertical direction with respect to the vehicle, and in the vehicle width direction, the horizontal direction when the vehicle is viewed from the front is the vehicle width direction.

  When an obstacle or the like rides on the bonnet when an obstacle or the like collides when the vehicle travels, the bonnet bends downward due to an impact from the collision object. At this time, if a highly rigid vehicle-mounted component or the like is disposed below the bonnet, the collision object strongly collides with the vehicle-mounted component or the like while bending the bonnet. In order to prevent this, it is demanded that a cowl top panel or a cowl top cover be provided with an impact absorbing structure that can alleviate the impact force from a collision object.

  In addition, when removing snow and ice accumulated on the cowl top cover, the cowl top cover may be attached to the cowl top cover by the weight of the snow or ice, or when scraping off the snow or ice by the scraper. A pressing force that is pressed to the front side of the lens acts. Due to this pressing force, the cowl top cover may be deformed, and the engagement state between the cowl top cover and the windshield may be disengaged. Therefore, it is required to prevent the cowl top cover from falling off the windshield.

  The present applicant has already proposed as a cowl top cover (see Patent Document 1) that has both an impact absorbing structure that absorbs impact force from above and a function that can prevent the cowl top cover from falling off the windshield. doing. The cowl top cover described in Patent Document 1 is configured as shown in FIG.

  That is, the cowl top cover 22 is provided with a protruding portion 23 that protrudes upward in at least one place in the vehicle width direction. The vertical cross-sectional shape of the projecting portion 23 is formed in a reverse concave shape opened downward. A pair of ribs 25 along the front-rear direction of the vehicle body are provided on the back surface side of the protrusion 23 so as to face each other. A plurality of ribs 25 can be formed in the vehicle width direction. Between the pair of ribs 25, a slit-like gap 26 formed downward from the top 23a of the protrusion 23 is formed.

  Since the snow or ice accumulated on the cowl top cover 22 is scraped off by its own weight, even if a pressing force is applied to the cowl top cover 22 on the front side, the gap 23 is formed as the protrusion 23. If the ribs 25 sandwiching the gap 26 come into contact with each other after being crushed until they disappear, it is possible to prevent the protrusion 23 from further deforming.

  Further, when an impact force from above is applied to the bonnet, the slit-like gap 26 can be expanded and deformed in a fan shape. Since it is configured in this manner, the rib 25 does not hinder the cowl top cover 22 from being deformed in order to absorb the impact force from above. The cowl top cover 22 can be deformed to absorb the impact force from above.

JP 2011-73504 A

  In the invention described in Patent Document 1, an impact absorbing function against an impact force from above and a function capable of preventing the cowl top cover 22 from falling off from the windshield 24 are simultaneously achieved, and a structure that can sufficiently withstand practicality It has become. However, there are further details regarding the demands for providing the cowl top cover with a structure that provides further resistance to the pressing force toward the front side of the vehicle, and requests for changing the shape of the cowl top cover. As you study, you will need to make further improvements.

  The present invention is obtained by further improving the cowl top cover described in Patent Document 1, and can maintain the shock absorbing performance of the cowl top cover when an impact force is applied on the bonnet. Deposits such as snow and ice accumulate on the top cover, and due to the weight of the accumulated snow and ice, and to scrape off the snow and ice, the pressing force toward the front of the vehicle against the cowl top cover Even when the cover is added, the cowl top cover can be prevented from falling out of the state of engagement with the windshield, and when the pressing force is no longer applied, the cowl top cover can function sufficiently. The challenge is to provide a cowl top cover that can be demonstrated.

Such an object of the present invention can be achieved by the cowl top cover described in claims 1 and 2.
That is, in the cowl top cover according to the present invention, the cowl top cover that covers the space between the lower end of the windshield and the rear end of the bonnet and extends in the vehicle width direction,
The front end portion of the cowl top cover is fixed to a cowl top panel extending along the vehicle width direction on the front side of the windshield, and an engagement portion that engages with the windshield is provided at the rear end portion. The cowl top cover is formed with at least one protrusion in the vehicle width direction that has a concave portion with an inverted vertical cross-sectional shape and protrudes upward, and between the opposing side surfaces on the back side of the protrusion. The connecting rib is formed in at least one line along the vehicle width direction,
The rib is configured to have a shape having a straight rib portion erected from the one side surface in the front-rear direction of the vehicle, and a branch rib portion branched from the front end portion of the straight rib portion in the vehicle width direction. Is the most important feature.

  Further, the cowl top cover according to the present invention is mainly characterized in that the rib is formed in a substantially Y shape or a substantially inverted Y shape in plan view.

  In this invention, the rib provided with the linear rib part and the branch rib part is used as a structure of the rib which connects between the opposing side surfaces in the back surface side of the protrusion part provided in the cover main-body part. Deposits such as snow and ice accumulate on the cowl top cover, and due to the dead weight of the accumulated snow and ice, and to scrape off the deposits such as snow and ice, Even if the pressing force is applied to the cowl top, the pressing force toward the front side can be supported by the linear rib and the branch rib portion. As described above, since the deformation of the cowl top cover can be regulated by the rib, it is possible to prevent the cowl top cover from falling out of the engaged state with the windshield.

  In addition, when the impact force from above acts on the cowl top cover, the rib according to the present invention can cause the cowl top cover to sufficiently exhibit shock absorbing performance without hindering deformation of the cowl top cover. it can.

  As described above, in the cowl top cover according to the present invention, the rib that reinforces the projecting portion is added to the cowl top cover and the shock absorbing function against the impact force from above without forming slit-like gaps. The cowl top cover can be provided with the function of preventing the cowl top cover from falling off the windshield by the pressing force toward the front side.

  Further, when it is desired to improve the shock absorption performance from above, a high shock absorption performance can be obtained by configuring the rib height dimension low. Moreover, even in this case, by configuring the rib height to a predetermined height, the performance of preventing the cowl top cover from falling off from the engaged state with the windshield is as desired. The performance can be maintained.

  In the present invention, the rib shape in plan view can be formed in a substantially Y shape or a substantially inverted Y shape. In the case where the cowl top cover is prevented from falling off from the windshield when formed in a substantially Y shape or a substantially inverted Y shape, the ratio of the straight rib portion in the total length of the rib in plan view is large. You can increase the effect. In addition, the angle formed by the bifurcated portion from the straight rib portion, that is, the narrow angle at the V portion in the substantially Y shape is configured to be an acute angle rather than an obtuse angle. The effect which can prevent dropping from glass can be enhanced.

It is a perspective view of a vehicle front part. (Example) It is AA sectional drawing of FIG. (Example) It is a principal part rear view of the cowl top cover using a substantially Y-shaped rib. Example 1 It is a principal part reverse view of the cowl top cover using the substantially reverse Y-shaped rib. (Example 2) It is principal part sectional drawing which shows analysis conditions. (Examples 1 and 2 and Reference Example) It is a figure which shows an analysis result, (a), (b), (c) is the analysis conditions and analysis when using a substantially reverse Y-shaped rib, a substantially Y-shaped rib, and a linear rib, respectively. The results are shown, and (1), (4) and (5) are back views of the cowl top cover using ribs of each shape, and (2), (5) and (8) are respectively The analysis results when F ₁ acts, (3), (6), and (9) are the analysis results when F ₂ acts. (Examples 1 and 2 and Reference Example) It is principal part sectional drawing of the cowl top cover containing a bonnet and a windshield. (Conventional example)

  The form of the cowl top cover according to the present invention will be specifically described below with reference to the accompanying drawings. As the cowl top cover according to the present invention, in addition to the shape and configuration described below, any shape and configuration that can solve the problems of the present invention can be adopted. is there. For this reason, this invention is not limited to the Example demonstrated below, A various change is possible.

  As shown in FIG. 1, a perspective view of the front portion of the vehicle, the engaging portion 2 c of the cowl top cover 2 is engaged with the lower end portion 4 a of the windshield 4 as shown in FIG. 2. Further, as shown in FIG. 1, the upper part of the front compartment forming an engine room (not shown) is covered with a bonnet 5 so that the rear end side or front end side of the bonnet 5 can be opened. The bonnet 5 is rotatably supported at the front end portion or the rear end portion.

  A windshield wiper (not shown) is provided at the lower part of the windshield 4 to keep the windshield 4 covered with rain, snow, etc. in a good field of view. The motor that drives the wiper is covered by the cowl top cover 2. It is stored in a closed space.

  As shown in FIG. 2A, the cowl top cover 2 has a front end 2a fixed to the cowl top panel 6 and an engagement portion 2c formed on the rear end 2b of the cowl top cover 2 has a predetermined lap amount. Is engaged with the lower end 4a of the windshield 4.

  The cowl top panel 6 and the cowl top cover 2 can be made of a resin material or a metal material. A bonnet reinforcement 5a is attached to the back side of the bonnet 5. When the bonnet 5 is closed, the bonnet reinforcement 5a extends along the vehicle width direction at the protrusion 3 of the cowl top cover 2. It is in pressure contact with the provided seal member 7. The sealing member seals between the bonnet 5 and the cowl top cover 2 to prevent rainwater or the like from entering the front compartment.

  The front end 2a of the cowl top cover 2 is supported by the cowl top panel 6. The cowl top cover 2 has protrusions 3 protruding upward in the front-rear direction of the vehicle 1 at at least one location in the vehicle width direction. The protrusion 3 is formed in a reverse concave shape whose vertical cross-sectional shape opens downward, and can be formed integrally with the cowl top cover 2 or can be formed separately.

  In the following description, a configuration example in which the protruding portion 3 is formed integrally with the cowl top cover 2 will be described. When the protruding portion 3 is formed separately from the cowl top cover 2, the protruding portion 3 formed separately can be attached to the cowl top cover 2 using appropriate fixing means.

(Rib structure)
Ribs 10 formed along the front-rear direction of the vehicle 1 are provided on the back surface side of the protruding portion 3. The rib 10 has a configuration in which the side surfaces 3a facing each other on the back surface side of the protruding portion 3 are connected. As shown in FIG. 2 (b), the rib 10 has a plan view shape viewed from the back surface side of the cowl top cover 2. The rib 10 is formed in a substantially Y shape when the front side of the vehicle is positioned above the character. The rib 10 is configured to have a straight rib portion 10a and a pair of branch rib portions 10b along the longitudinal direction of the vehicle.

That is, on the back surface side of the protruding portion 3, the base end portion of the linear rib portion 10a is connected to the side surface 3a located on the rear side of the vehicle 1. A pair of branch rib portions 10b branched in the vehicle width direction are connected to the front end portions of the straight rib portions 10a, and the front end portions of the pair of branch rib portions 10b respectively stand up the straight rib portions 10a. It is connected to the side surface 3a facing the side surface 3a. As a configuration of the rib 10, a configuration in which three surfaces on the back surface side of the projecting portion 3, the both side surfaces 3a and the ceiling surface 3b are connected is shown, but if the strength as the rib 10 is obtained, the ceiling surface 3b Can be configured not to be connected.
In addition, as an arrangement configuration of the ribs 10 in the protruding portion 3, a perspective view (1) viewed from the back side of the cowl top cover 2 in FIG. 6A can be referred to.

  The protrusions 3 can be provided at least at one location in the vehicle width direction, and can be configured in a shape having a predetermined plate thickness. Further, the number of ribs 10 formed in one protrusion 3 can be at least one or more in the vehicle width direction.

  FIG. 3 shows a plan view of the main part viewed from the back side of the cowl top cover 2. On the back side of the projecting part 3, an arrangement of substantially Y-shaped ribs 10 with the vehicle forward direction being above the characters is shown. The configuration is shown.

  The rib 10 is configured so that the straight rib portion 10a and the branch rib portion 10b have substantially the same plate thickness. In the present invention, the plate thickness of the rib 10 is not limited to a uniform plate thickness, and the plate thickness of the straight rib portion 10a and the plate thickness of the branch rib portion 10b are set as necessary. Different plate thicknesses can be configured.

  FIG. 4 shows the cowl top cover 2 when the shape of the rib 10 ′ formed on the back surface of the projecting portion 3 in a plan view is a substantially inverted Y shape with the forward direction of the vehicle above the character. The principal part top view seen from the back surface side is shown. Even when the planar shape of the rib 10 ′ is configured in a substantially inverted Y shape, the plate thickness of the straight rib portion 10′a and the branch rib portion 10′b may be configured to be substantially the same plate thickness, or different plates. It can also be configured as a thickness.

  As the shape of the ribs 10 and 10 ', a description has been given of a substantially Y-shape or a substantially inverted Y-shape, but the configuration of the rib having the straight rib portion 10a and the branch rib portion 10b is substantially Y-shaped. The shape of the branched rib portion 10b is not limited to the shape of the shape and the substantially inverted Y shape, and the branched rib portion 10b may be branched in three or more ways from the tip portion of the linear rib portion 10a. For example, the same rib as the straight rib portion 10a may be formed at the front end of the straight rib portion 10a, or a plurality of branch ribs branched from the front end portion of the straight rib 10a in the left-right direction in the vehicle width direction. The part 10b can also be configured.

(Function and effect of ribs 10 and 10 ')
The effects obtained when the substantially Y-shaped rib 10 and the substantially inverted Y-shaped rib 10 'are formed on the back surface side of the protruding portion 3 will be described with reference to FIGS. In describing the function and effect of the ribs 10 and 10 ', a configuration in which the linear rib 10''is used instead of the ribs 10 and 10' will be described as a reference configuration.

  In FIGS. 5 and 6, the engagement portion 2c is omitted from the illustration of the engagement portion 2c and the seal member 7 that engage with the lower end portion 4a of the windshield 4 with a predetermined lap amount. Further, the forward direction of the vehicle is indicated by FR, and the reverse direction is indicated by RR.

In FIG. 5, when the ribs 10, 10 ′, 10 ″ are provided on the back surface side of the protrusion 3, the stress state generated in the cowl top cover 2 is analyzed from above the protrusion 3. The direction of the impact force F ₁ and the pressing force F _{2 applied} from the side of the projecting portion 3 toward the front side of the vehicle is shown. The impact force _{F 1} and the pressing force _{F 2,} and by applying a load of 50 N.

Then, when the impact force F ₁ was applied to the protrusion 3 of the cowl top cover 2 from above, the amount of displacement at the position P ₁ that is the front side corner of the protrusion 2 was measured. Further, the pressing force F ₂ when allowed to act toward the front side of the projecting portion 3 of the cowl top cover 2, and measuring the displacement amount at the position P ₂ at the trailing end portion 2b of the cowl top cover 2.

  The ribs 10, 10 ′, 10 ″ are connected to the three opposite surfaces 3 a and the ceiling surface 3 b on the back surface of the protrusion 3. The ribs 10, 10 ′, 10 ″ are formed integrally with the cowl top cover 2, and the plate thicknesses of the ribs 10, 10 ′, 10 ″ are the same. In addition, the heights of the ribs 10, 10 ', 10 "are all the same.

FIG. 6 shows the analysis results when the impact force F ₁ and the pressing force F ₂ shown in FIG. 5 are individually applied to the protrusion 3 using a load of 50 N. In FIG. 6, in correspondence with the ribs 10, 10 ′, 10 ″, (a) uses a substantially Y-shaped rib 10, and (b) shows a substantially inverted Y-shaped rib. When 10 ′ is used, (c) shows a case where a linear rib 10 ″ is used.

In (a), which shows a case where a substantially Y-shaped rib 10 is used, (1) shows a perspective view of the main part as seen from the back side of the cowl top cover 2, and (2) shows a pressing part. when allowed to act from the side of the pressure F ₂ to the protrusion 3 shows the stress distribution generated in the cross section of the cowl top cover 2, the, to act from above the impact force F ₁ to the protrusion 3 (3) The stress distribution generated in the cross section of the cowl top cover 2 is shown.

Similarly, (b) showing the case of using a substantially inverted Y-shaped rib 10 'and (c) showing the case of using a linear rib 10''are respectively shown in (4) and (7). shows a main part perspective view seen from the back side of the cowl top cover 2, (5), when allowed to act on, from the lateral pressing force F ₂ to the protruding portion 3 (8), the cowl top cover 2 shows the stress distribution generated in the cross section 2 and (6) and (9) show the stress distribution generated in the cross section of the cowl top cover 2 when the impact force F ₁ is applied from above the protrusion 3. ing.
As the scale showing the stress distribution in FIG. 6, the stress becomes lower as it goes to the upper side of the scale, and the stress becomes higher as it goes to the lower side.

As shown in (2), (5), and (8) of FIG. 6, when the pressing force F _{2 is applied} to the projecting portion 3, which rib 10, 10 ′, 10 ″ is on the rear surface of the projecting portion 3. It can be seen that even if formed, the stress distribution generated in the cowl top cover 2 on which the respective ribs 10, 10 ′, 10 ″ are formed has substantially the same stress distribution state.

As the displacement at P ₂ is a rear end portion of the cowl top cover 2, in (2) in the case of using the ribs 10 of substantially Y-shaped, and 0.787mm displacement, substantially inverted Y-shaped rib In (5) using 10 ′, the displacement was 0.903 mm, and in (8) using linear rib 10 ″, a displacement of 0.974 mm was measured.

As can be seen from this, the substantially Y-shaped rib 10 and the substantially inverted Y-shaped rib 10 'are formed on the projecting portion 3 as compared with the case where the linear rib 10''is formed on the back surface of the projecting portion 3. When formed on the back surface, the amount of displacement of the cowl top cover 2 caused by the pressing force F ₂ acting on the protrusion 3 is reduced, and the amount of displacement in the direction of falling off the windshield 4 can be reduced. .

That is, the pressing force F ₂ branch rib 10b, by 10'b is a side 3a of the back surface of the protruding portion 3 is dispersed, i.e., to act on the side opposite to the side surface 3a of the pressing force F ₂ acts become. Therefore, stress concentration may be generated on the side surface 3a on the back surface of the protruding portion 3, that is, the side surface facing the side surface 3a on which the pressing force F2 acts, as in the case of using the linear rib 10 ''. It is thought that there is nothing. Then, it is considered that the displacement amount of P ₂ is a rear end portion of the cowl top cover 2 is smaller.

  Further, when comparing the approximately Y-shaped rib 10 and the approximately inverted Y-shaped rib 10 ′, the cowl top cover 2 is more easily removed from the windshield 4 when the approximately Y-shaped rib 10 is configured. The amount of displacement in the direction to be performed can be reduced.

As shown in (3), (6), and (9) of FIG. 6, when the impact force F ₁ is applied from above the protrusion 3, which rib 10, 10 ′, 10 ″ It can be seen that even if formed on the back surface, the stress distribution generated in the cowl top cover 2 formed with the respective ribs 10, 10 ′, 10 ″ shows substantially the same stress distribution state.

As the displacement amount at the position P _1, in (3) in the case of using the ribs 10 of substantially Y-shaped, and 1.71mm displacement, in the case of using a substantially inverted Y-shaped rib 10 '( In 6), the displacement was 1.74 mm, and in (9) when the linear rib 10 ″ was used, a displacement of 1.75 mm was measured.

  From this, even if a substantially Y-shaped rib 10 is formed as a rib shape, a substantially inverted Y-shaped rib 10 ′ is formed, or a linear rib 10 ″ is formed, It is possible to achieve substantially the same shock absorbing performance with respect to the impact force from above.

Thus, 'by forming the on the rear surface of the projecting portion 3, for the impact force F ₁ from above, linear ribs 10' ribs 10, 10 according to the present invention when forming a ' The same shock absorbing performance can be achieved, and the cowl top cover 2 is reliably prevented from falling off the windshield 4 against the forward pressing force F _{2 with} respect to the protrusion 3. be able to.

  The present invention can be applied to a cowl top cover.

2 ... Cowl top cover, 2c ... engagement part, 3 ... projection part, 3a ... side face, 4 ... front glass, 5 ... bonnet, 6 ... cowl top panel, 10 ... substantially Y-shaped rib, 10 '... substantially reverse Y Character-shaped ribs, 10 ″ ... linear ribs, 10a, 10′a, 10 ″ a ... linear rib portions, 10b, 10′b, 10 ″ b ... branch rib portions, F ₁ ... impact force from above , F ₂ ... pressing force to the front side.

Claims (2)

In the cowl top cover that covers the space from the lower end of the windshield to the rear end of the bonnet and extends across the vehicle width direction,
The front end portion of the cowl top cover is fixed to a cowl top panel extending along the vehicle width direction on the front side of the windshield, and an engagement portion that engages with the windshield is provided at the rear end portion. Formed,
In the cowl top cover, at least one place in the vehicle width direction is formed with a protruding portion that protrudes upward in a concave shape whose longitudinal cross-sectional shape is opposite,
At least one rib formed between the side surfaces facing each other on the back surface side of the protruding portion is formed along the vehicle width direction,
The rib is configured to have a shape having a straight rib portion erected from the one side surface in the front-rear direction of the vehicle, and a branch rib portion branched from the front end portion of the straight rib portion in the vehicle width direction. A cowl top cover characterized by   The cowl top cover according to claim 1, wherein the rib is formed in a substantially Y shape or a substantially inverted Y shape in a plan view.

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