JPS6237201A - Fiber reinforced plastic - Google Patents

Abstract

PURPOSE:To improve the profile accuracy and the strength, in the fiber reinforced plastic rim for vehicle having a projection for fixing a plate in the center of innercircumferential face, by laminating three pseudo-isotropic layers composed of plural resin immersed layers and forming drop center, bead seat section and flange section. CONSTITUTION:Three layers of epoxy resin immersed carbon fibers and laminated while shifting the direction of fiber by about 30 deg. onto each of a pair of inner dies 8 to set a pseudo-isotropic surface layer 6. Then six sheets of fibers are pseudo-isotropically laminated with fiber direction of about 30 deg. to form an intermediate layer 5 which is laminated onto the surface layer 6. Thereafter, the inner dies 8 are integrated through a bolt and a nut to align with the central axis and the rotary shaft 10 is inserted into said dies 8 to rotate said shaft 10 thus to form a filament winding layer 7 where the epoxy resin immersed reinforcing fibers are making angle of + or -10 deg., + or -60 deg. against the rotary shaft 10. With such arrangement, the profile accuracy and the strength can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rim made of fiber-reinforced plastics, so-called FRP, and more specifically to a rim for automobiles or two-wheeled vehicles that has a protrusion for attaching a plate at the center of the inner peripheral surface. FR for
This relates to a rim made of P.

[Prior Art] Most wheel rims of automobiles and motorcycles are made of metals such as steel, aluminum, and aluminum alloys, and in order to reduce fuel consumption, it is necessary to reduce their weight. Therefore, in recent years, various proposals regarding FRP rims have been made to meet this demand.

FIRP rims include those that use short fibers as reinforcing fibers and those that use long fibers, and there are also types of rims that have a protrusion for attaching a plate on the inner peripheral surface.

(Problems caused by the vertical shape of the invention) By the way, when using either short fibers or long fibers as reinforcing fibers, in order to form the protrusion for attaching the plate, it is necessary to protrude the inner mold for molding. It is necessary to provide a recess corresponding to the part, but the protrusion for attaching the plate obtained by filling the recess with reinforcing fibers, especially continuous long fibers, can ensure an accurate shape and desired strength. This is difficult because it is difficult to evenly fill a narrow recess with fast-reading fibers, and if the bolt holes are opened using general machining after molding, the fibers may be shredded or the fiber layer may be damaged. Turn over,
Otherwise, peeling may occur.

Therefore, it is an object of the present invention to eliminate the problems in terms of shape and strength of the plate attachment protrusion in the FRP rim.

[Means for solving problems]

The FRP rim of this invention that achieves the above U objective is the second
Figure) Of the plate attachment protrusion 1, drop center 2, bead seat part 3, and flange part 4 shown, the plate attachment protrusion 1 is laminated on the intermediate layer 5 and its left and right sides as shown in FIG. It has a three-layer structure consisting of the surface layer 6.6, and the left and right surface layers 6.6 are a state in which a plurality of reinforcing fiber fabrics impregnated with resin are laminated with the fiber orientation of each fabric shifted at a certain angle. The drop center part 2, bead seat part 3, and flange part 4 shown in FIG. The inner layer is also constructed at the same time.

In addition, for the intermediate layer 5, a ring-shaped pseudo-isotropic laminate similar to the surface layer 6 is used, and in addition, the outer layer of the drop center part, bead seat part, and flange part is laminated on the inner layer. No. 7 has a structure in which a layer in which resin-impregnated reinforcing fibers are oriented at a low angle with respect to the axis of rotation of the rim and a layer in which the reinforcing fibers are oriented at a high angle are combined.

Note that the intermediate layer 6 may be a layer formed by winding long fibers impregnated with resin in the circumferential direction.

The FRP rim of the present invention constructed as described above can be manufactured by the method shown in FIG.

That is, the layer 5.6 explained in FIG. 1 is formed on a pair of left and right molding inner molds 8.8 that are divided at the center, and then the pair of inner molds are fastened with bolts and nuts 9 and then integrated. The rotating shaft 10 is attached to the inner mold, and the layers 5 and 6 are rotated together with the inner mold, and the layer 7 is formed thereon. The desired rim is obtained by heating and curing the entire mold while applying pressure using an outer mold 11 which is divided into a plurality of parts and each of the divided molds is equipped with an external pressure applying means.

〔Example〕

Examples of the rim of the present invention will be shown below along with manufacturing procedures.

Each of the pair of inner molds 8 shown in FIG.
341 are pseudo-isotropically stacked so that the fiber directions are shifted by 30 degrees, and the excess length at the center and outer periphery is trimmed to form the layers along the mold 8 into a ring shape.

Next, a material made by laminating six pieces of cloth similar to the above in a quasi-isotropic manner with fiber orientation at a deviation angle of 30° is cut out into a ring shape and laminated on the surface layer of one of the inner molds as a constituent material of the intermediate layer 5. .

Thereafter, the pair of inner molds 8 are brought into close contact with each other so that the central axes of the rims coincide, and are integrated with bolts and nuts 9.

In addition, the rotating shaft 10 is inserted into the integrated inner mold while being prevented from rotating, and then the shaft 10 is rotated to apply reinforcing fibers impregnated with epoxy resin to the surface of the layer 5.6 against the rotating shaft of the rim. First, the filament is wound at a winding angle of ±10° and then at a winding angle of ±60°, and this operation is repeated to form N7. Thereafter, the layer 5.6.7 is heated and hardened while being pressurized using the outer mold 11 explained in FIG.
Obtain the FRP rim of the present invention.

The rim obtained through the above step 7a has a wall thickness of 4 mm in all parts, and a weight of approximately 1.5 Pf.
A weight reduction of approximately 0.51 was achieved compared to an alloy rim.

[Effect] In the FRP rim of the present invention described above, after forming the surface layer 6 on the divided inner mold, the intermediate M is formed on one surface layer.
Since it is possible to adopt a manufacturing method in which the plates 5 and 5 are stacked and then the pair of inner molds are integrally fitted together, the protrusion for attaching the plate can be easily molded.

Furthermore, since the surface of the protrusion is made of reinforcing fiber fabric FJ, it is difficult to curl up or peel off even when machined, and the bolt holes for attaching the plate can be easily machined and the hole accuracy can be improved.

Furthermore, if the intermediate layer is formed by winding continuous long fibers in the circumferential direction, a rim with extremely high annular rigidity can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the laminated structure of the rim of the present invention, and FIG.
The figure is a sectional view showing a part of the outer contour of the rim, and FIG. 3 is a partial sectional view showing an example of the manufacturing method. DESCRIPTION OF SYMBOLS 1... Projection part for plate attachment, 2... Drop center, 3... Bead seat ffi, 4... Flange part, 5... Intermediate layer, 6... Surface layer, 7... Outer layer patent applicant: Sumitomo Electric Industries, Ltd. Same as above
Honda Motor Co., Ltd. Agent Kama 1) Text Nihe 73 Figure

Claims (1)

[Claims] The protrusion for attaching the plate has a three-layer structure consisting of an intermediate layer and a surface layer laminated on the left and right sides of the intermediate layer. In addition to forming an isotropic laminated structure, the inner layer of the drop center portion, bead seat portion, and flange portion extending in the opposite direction from the outer end of the protruding portion and connected to the protruding portion is also configured, while the intermediate layer is the same as above. The outer surface of the drop center portion, bead seat portion, and flange portion laminated on the inner surface layer is made of a ring-shaped material made of a pseudo-isotropic laminate or a circumferentially wound product of resin-impregnated continuous fibers. A rim made of fiber-reinforced plastics, characterized in that the layer is composed of a combination of a layer in which resin-impregnated continuous reinforcing fibers are oriented at a low angle and a layer oriented at a high angle with respect to the axis of rotation of the rim.