JPS58191604A - Wheel rim for vehicle - Google Patents

Abstract

PURPOSE:To achieve a less weight and a greater air tightness by making the surface of a rim molded with a reinforced resin smooth employing a synthetic resin coating layer. CONSTITUTION:In a wheel body 1, a rim section 2, a spoke section 3 and a hub section 4 are molded integral with a fiber-reinforced resin to reduce the weight. The surface 2a of a double-split rim section 2 is coated with a synthetic resin to form a synthetic resin coated layer 14. This enables stopping of irregularities on the surface 2a or clearances at joints to make the surface 2a so smooth that the air tightness is further secured at joints between the contact section 13a of a tire and the surface 2a of the rim section and the double-split rim section 2 in the mounting of a tubeless tire 13. This synthetic resin coated layer 14 also reinforces the rim section 2 thus effective for correction of the oscillation accuracy of the rim section 2 as generated during the travelling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel rim for small vehicles such as motorcycles and tricycles.

When providing lightweight rims for wheels for small vehicles of this type, it is desirable to mold them from fiber-reinforced resin, which is lightweight and has excellent strength and rigidity. requires airtightness between the contact area between the rim and the tire.

The present invention was developed in response to such demands, and is characterized in that a synthetic resin coating layer is formed on the surface of a rim made of fiber-reinforced resin.

An object of the present invention is to make the rim surface molded from fiber-reinforced resin a smooth surface with a synthetic resin coating layer to further improve the airtightness between the tire and the rim when mounting a tubeless tire. To provide a lightweight vehicle wheel rim which is reinforced and can suppress vibration of the rim during driving.

Hereinafter, one embodiment of the present invention will be explained based on the present invention.

A wheel body 1 of a vehicle wheel is lightweight by integrally molding a rim portion 2, a spoke portion 3, and a hub portion 4 from fiber-reinforced resin. Further, this wheel body 1 has a structure in which symmetrical half bodies 1a and 1b, which are obtained by dividing a rim part 2 and spokes 3 in a direction perpendicular to the axle axis direction, are joined and integrated. The joining of the half bodies 1a and lb is performed by joining the nine joint flange parts 5a-, 5b which are extended to the inner periphery of the rim part 2 and both sides of the spoke part 30, respectively, butt against each other, and join the joint flange parts 5a, 5b. are integrated by tightening them with mechanical fixing means 6 such as bolts, nuts or rivets. The spoke portion 3 has a U-shaped cross section with joint 7 flange portions 5a, 5b on both sides in the state of the half-split bodies 1a, 1b. In this state, as shown in Fig. 3, the wheel has a hollow square shape that provides strength and rigidity.Furthermore, the hollow square shape is formed so that it gradually becomes thicker toward the center of the wheel, and the spoke portions 3 and rim portions 2 and the connecting part 7°8 with the hub part 4
The wheel is made thicker than other parts to further increase the strength and rigidity of the wheel. A cylindrical body 9 made of fiber-reinforced resin is connected to the inner periphery of the hub portion 4 of the integrally joined wheel body 1.

Then, bearings are press-fitted into both ends of the hub part 4,
8MC, Al for installing the disc plate.

A bearing part 10.11 made of a light alloy such as Mg is coupled,
It is fixed together with the cylindrical body 9 by fixing means 12, 13 such as bolts, nuts or rivets.

The fiber-reinforced resin has a matrix of, for example, epoxy resin, polyester resin, phenol resin, etc., and is reinforced with filaments such as carbon fiber, aromatic polyamide fiber (3), glass fiber, silicon carbide fiber, boron fiber, alumina fiber, etc. It is made of hardened material. The half bodies la and lb constituting the wheel body 1 are formed by laminating reinforcing fibers and resin in respective molds, curing and molding them, and then demolding and finishing the half bodies. Split body 1a, 1btl-Mold. This half body 1'' + 1b is joined as described above to form the wheel body 1, but the tubeless tire 13 of the rim portion 2 is
On the surface 2a to which the mold is attached, air bubbles mixed in during molding exist in the form of minute irregularities. Also, half body l a.

A minute gap exists at the joint of the rim portion 2 of 1b.

These are 13'ft tubeless tires! When attached to the JA section 2, this becomes a cause of impairing airtightness.

(5) (4) In the present invention, a synthetic resin is applied to the surface 2a of this split rim portion 20, and a synthetic resin coating layer 1 is applied to the rim surface 2a.
4 is formed. As a result, the irregularities existing on the surface 2a or the gaps at the joints are closed, and the rim surface 2a is closed.
Since a is a smooth surface, when the tubeless tire 13 is mounted, the airtightness of the joint between the contact portion 13a of the tire, the rim surface 2a, and the rim portion 2 divided into two parts is further ensured. Furthermore, this synthetic resin coating layer 14 serves as reinforcement for the rim portion 2 and is also effective in correcting the runout accuracy of the rim portion 2 that occurs during running. For example, epoxy resin is used as the synthetic resin to be applied, and the thickness of the coating layer is suitably S to SOμ, but is not limited thereto.

In addition, although the half bodies 1a and 1b constituting the wheel body 1 were molded separately and joined together at the rim part 2, this was carried out separately. The same can be applied to the part fixed to the part 3.

The method for forming the rim portion 2 is not limited to the method described above, and may be formed by a filament winding method or the like.

Furthermore, although the above embodiment has been described with respect to the case where a tubeless tire 13 is mounted, a tube tire also maintains airtightness and is effective in preventing infiltration of water and the like.

In the present invention, as mentioned above, the rim is molded from fiber-reinforced resin, which is a lightweight material, so the weight of the rim can be reduced, and the surface of the rim is coated with synthetic resin to form a synthetic resin coating layer. When the surface is smooth, especially when a tubeless tire is installed, the airtightness between the rim surface and the tire contact area is further improved.

In addition, in the case where the wheel is molded in sections and joined at the rim part, the gap created at the joint part of the rim part is closed to prevent air leakage. Furthermore, the synthetic resin coating layer is also effective in correcting the accuracy of rim runout that occurs during driving.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the wheel, FIG. 1 is a sectional view taken along ■-■ in FIG. 7, and FIG. be. 1 is a wheel body, 2 is a rim portion, 2a is a surface thereof, (7) 3 is a spoke portion, 4 is a hub portion, 13 is a tubeless tire, 13a is a contact portion, and 14 is a synthetic resin coating layer. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney Den Kido - Immediate Question Kido - Onma Shige Nori Hattori - Toshio Tsuruwaka (8) Go l kyo 1 "■ JP-A-58-1916 O4 (4) Procedural amendment January 14, 1981 1. Indication of the case Patent Application No. 73086 of 1988 2. Name of the invention Relationship to the vehicle wheel rim case Patent applicant (532) Honda Motor Co., Ltd. 4 , Voluntary Submission by Agent 8, Contents of Amendment 11 Theta Saba 1 (1) Correct "13" to "12" on page 4, line 12 of the specification. (2) Correct the reference numeral "12" in Figure 2 of the drawings in red inscription attached to the attached sheet. Above (1)

Claims (1)

[Claims] 1. A wheel rim for a vehicle, characterized in that a synthetic resin coating layer is formed on the surface of the rim molded from fiber-reinforced resin.