JPS60219167A - Reinforcement structure of synthetic resin lid for automobiles - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 OBJECTS OF THE INVENTION (1) Industrial Field of Application The present invention relates to a reinforcing structure for synthetic resin automobile lids such as bonnets and trunk lids, particularly for lids whose basic shape is rectangular.

(2) Prior Art It is already known to mold automobile lids from synthetic resin, as described in Japanese Utility Model Publication No. 44-7602 and Japanese Unexamined Patent Publication No. 56-60776.

This type of lid generally has the advantage of being lighter than one made of steel plate, but is inferior in rigidity. Therefore,
As described in the above-mentioned publication, the conventional type has multiple ribs protruding from the inner surface of the lid to increase the rigidity of the lid. No efficient reinforcement structure has been developed to strengthen it.

(3) Problems to be Solved by the Invention The object of the present invention is to provide an efficient reinforcing structure capable of imparting a large torsional rigidity to a synthetic resin lid with as little amount of lip as possible.

B1 Structure of the Invention (1) Means for Solving the Problems According to the present invention, the reinforcing structure includes peripheral ribs extending along the four sides of the lid on the inner surface of the lid, and one length of the lid. A first chevron lip extending to connect approximately the midpoint of one side and both ends of the other long side, and a first chevron lip extending to connect approximately the midpoint of one long side and approximately the midpoint of the other long side. It is constructed by protrudingly providing a second chevron-shaped rib that extends so as to be connected.

(2) Function: a peripheral lip extending along the four sides of the lid; a first chevron-shaped rib extending so as to connect approximately the midpoint of one long side of the lid to both ends of the other long side; The second chevron lip that connects both ends of the long side and approximately the midpoint of the other long side cooperates to efficiently impart torsional rigidity to the synthetic resin lid.

(3) Example One example of the present invention will be explained with reference to drawings.
In the figure, a car 1 is equipped with a hood 2 as a lid, and this bonnet 2 is made of synthetic resin, for example, SMC.
Molded from wood.

As shown in Figure 2, the bonnet 2 has a basic rectangular shape with its long sides facing in the left-right direction of the vehicle, with the front side slightly curved outward and the rear side curved largely inward. , the central part of the front side serves as a striker attachment part 3, and both ends of the rear side serve as a pair of hinge attachment parts 4, 4. A striker 5 for detachably fixing the front end of the bonnet 2 to the vehicle body is attached to the striker attachment portion 3, and the rear end of the bonnet 2 is hingedly connected to the vehicle body to the hinge attachment portions 4, 4. A hinge 6.6 for each is attached.

The inner surface of the bonnet 2 has one or more peripheral ribs 7 extending along the four sides of the bonnet 2, and a rib 7 between approximately the midpoint of the long side of the front part of the bonnet 2 and both ends of the long side of the rear part. A first chevron-shaped lip 8 extends to connect the two sides, and a second chevron-shaped lip 9 extends to connect the approximate midpoint of the rear part and both ends of the long sides of the front part. 7.8.9
is integrally molded with the bonnet 2.

Therefore, the peripheral rib 7, the first and second chevron lips 8°9,
By working together, the torsional rigidity of the bonnet 2 is efficiently increased.

This was confirmed by the following test.

First, the following first to third test products α to C (see FIG. 3) are prepared.

・First test product α...A synthetic resin bonnet 2 with protruding peripheral ribs γ and first and second chevron ribs 8 and 9 in accordance with the present invention on the inner surface of the synthetic resin bonnet 2. .

・Second test product b...A synthetic resin bonnet 2 with two protruding ribs 10 and 11 intersecting each other in a lattice pattern.

・Third test item C...Inside the synthetic resin bonnet 2, --strip peripheral ribs 7 and two parallel diagonal ribs 12, 1
2 and protruding.

In addition, for each test product, the size of the bonnet 2 is 12 mm in width.
It is 00mm x depth 600m x thickness 2mm, and the size of the lip is 15N height x 1.8wn thickness.

Next, as shown in Figure 4, each test sample α to C was fixed to the test stand at three points (black circles in the figure): one end of the front side of the bonnet 2 and both ends of the rear side. A vertical load F was applied to the remaining free end to cause the i-throat to bend, and the magnitude of the load F at that time was investigated, and the results shown in the graph of FIG. 3 were obtained.

The graph in Figure 3 has "load" on the vertical axis and "lip factor" on the horizontal axis, so a large value on the vertical axis indicates high torsional rigidity of the bonnet 2, and a large value on the horizontal axis indicates high torsional rigidity. This shows that the weight increase rate of the bonnet due to the ribs is large. Therefore, if the value on the vertical axis is small and the value on the horizontal axis is small, it means that the torsional rigidity is efficiently strengthened by the lip.

Note that the "rib factor" is calculated from the following equation.

As a result of the above test, the first test product α according to the present invention was found to be the second test product α.
The third test sample showed a much larger value on the vertical axis and a much smaller value on the horizontal axis compared to sample c. From this, it can be seen that the reinforcing structure according to the present invention contributes to efficiently strengthening the torsional rigidity of the bonnet 2.

Returning to FIG. 2 again, the bonnet 2 is further provided with a plurality of diagonal lattice lips 1'3 protruding from the hood 2, which are connected to the peripheral lips 7. These lips I, 13 further increase the torsional rigidity of the bonnet 2. Contributes to reinforcement and surface rigidity.

C0 Effects of the Invention As described above, according to the present invention, the peripheral lip extending over all four sides of the lid is connected to the approximate midpoint of one long side of the lid and both ends of the other long side of the lid. The torsional rigidity of the synthetic resin lid can be efficiently improved by the cooperation of the first chevron-shaped lip extending as shown in FIG. This makes it possible to give the lid a large amount of torsional rigidity with a small amount of lip. Therefore, the torsional rigidity can be sufficiently increased without any loss of the inherent lightweight advantage of the synthetic resin lid. This prevents distortion as much as possible when opening and closing the lid, thereby increasing its marketability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an automobile to which the present invention is applied to the bonnet, Fig. 2 is a bottom view of the bonnet, and Fig. 3 is a graph showing the results of torsional rigidity tests of various test products, where α is the one to which the present invention is applied. Test products b and c are comparative test products, and FIG. 4 is an explanatory diagram of the above test method. 1...Automobile, 2...Bonnet as a lid,
7... Peripheral reply, 8, 9... 1st. Second Yamagata Lip patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] This is a reinforcing structure for a synthetic resin automobile lid whose basic shape is rectangular, and the inner surface of the lid includes peripheral ribs that extend along the four sides of the lid, and approximately the midpoint of one long side of the lid. A first chevron-shaped rib extends to connect each end of the other long side, and a first chevron rib extends to connect each end of one long side to approximately the midpoint of the other long side. A reinforcing structure for a synthetic resin lid for a trailing vehicle consisting of two protruding chevron ribs.