JPH01226401A - Spoke wheel for motor cycle - Google Patents

Abstract

PURPOSE:To prevent the occurrence of electrolytic corrosion between a rim and a nipple by a method wherein an electric insulating substance layer is formed between the spoke hole of the rim and a nipple threadedly joined with the outer end of a spoke. CONSTITUTION:When a spoke 3 is situated in the spoke hole of a rim 1, made of aluminum and on the inner peripheral surface of which chrome plating is applied, by means of a nipple 2 made of a stainless steel, an electric insulating washer 9 is located between the nipple 2 and the rim 1, and direct contact between the rim 1 and the nipple 2 is prevented from occurring. This constitution enables prevention of the occurrence of electrolytic corrosion due to contact of different metals with each other and enables suppression of rusting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a spoke wheel for a motorcycle or the like in which a large number of spokes are stretched between a hub and a rim.

(Prior art) Spoke wheels used in motorcycles, etc.
As shown in the figure, it has a structure in which a large number of spokes e are stretched between a hub a rotatably mounted on an axle and a rim d on which a tire b1 tube C is fitted around the outer periphery.

The tension of the spokes e is adjusted by tightening the nipples q, whose inner ends are suspended on the hub a, and nipples q are screwed into the threads f formed at the outer ends through the spoke holes of the rim d. Ru.

The rim d is mainly made of iron, aluminum, magnesium, or the like, and some have surface treatments such as chrome plating. The spokes e are made of steel, and the nipples Q are made of steel, aluminum alloy, or the like.

Therefore, in the fastening seat between the rim d and the nipple Q, dissimilar metals are likely to come into contact, and even if the metals are of the same type, electrolytic corrosion is likely to occur due to the difference in the Kanazawa composition contained therein. Electrolytic corrosion occurs when different metals have different ionization tendencies that create a potential difference that promotes rust, and it is more likely to occur on spoke wheels where the contact points are small and numerous, and where moisture is likely to be present. The chrome-plated rim d quickly loses its luster, rust builds up, and the plating film peels off, damaging the appearance of the inner circumferential surface of the rim d. In severe cases, the spoke holes and nipples collapse, causing the spokes to deteriorate. Problems such as falling off occurred.

(Problem to be Solved by the Invention) In view of the problem that when the contact between the rim and the nipple constituting the spoke wheel is made of a combination of different metals, the occurrence of rust is promoted due to electrolysis and corrosion, The purpose of the invention is to provide a spoke wheel for a motorcycle, etc., which prevents contact between dissimilar metals between the rim and the nipple, prevents electrolytic corrosion, and suppresses rusting in this part as much as possible. .

[Structure of the invention]

<';Means for solving the problem) In order to achieve the above object, the spoke wheel of the present invention, such as a two-wheeled motor vehicle, is a spoke wheel in which a large number of spokes are stretched between a hub and a rim. An electrical insulating layer is interposed between the rim and the nipples, which are screwed into the spoke holes of the rim and onto the outer ends of the spokes.

(Function) With this structure, the space between the rim and the nipple is
Even when combined with dissimilar metals such as iron, nickel, aluminum, and magnesium, they are electrically insulated to prevent direct contact, effectively preventing rust from occurring due to galvanic corrosion.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

In FIG. 1, a rim 1 is made of aluminum, and its inner peripheral surface is chrome plated. A nipple 2 made of stainless steel is inserted from the outside into a spoke hole arranged in the center line of the rim 1, and is screwed into a screw 4 at the outer end of a spoke 3 made of steel.

The nipple 2 has a driver groove 7 in its head 6, which is formed with a fastening seat 5 adapted to a seat around a spoke hole, and a spanner engaging surface 8 is formed in its main part. An electrically insulating washer 9 is interposed between the nipple 2 and the nipple 2, thereby preventing direct contact between the two and electrically insulating them.

The washer 9 has a truncated conical portion 9a as shown in FIG.
and a cylindrical portion 9b extending from the top thereof, the truncated conical portion 9a being interposed on the fastening seat 5 surface, and the cylindrical portion 9b separating the spoke hole from the nipple main portion.

The washer 10 shown in FIG. 2 is formed only with a truncated conical portion 10a. In this case, it is interposed between the fastening seats 5 and the spoke holes and the main part are insulated with a gap between them.

The electrical insulation properties of the washers 9 and 10 are obtained by molding the immediate material from synthetic resin or rubber. Also, in the case of metal washers, it can be obtained by coating such as painting, and in the case of aluminum washers, it can be obtained by alumite processing.

In this way, the rim 1 and the nipple 2 are electrically insulated, and even if dissimilar metals such as chrome and steel or aluminum and steel are facing each other, rusting due to galvanic corrosion is prevented, and it lasts for a long time. The appearance of the outer surface of the rim, in this case the luster of the chrome, is not lost.

Regardless of whether the rim is made of aluminum, magnesium, or iron without chromium plating, or the nipple 2 is made of any material, the above structure effectively prevents rusting and corrosion due to electrolytic corrosion.

Next, FIG. 3 shows another embodiment of the present invention.

The surface of the metal nipple 11 is coated with an electrically insulating material 111112 by electrodeposition.

By screwing the nipple 11 into the spoke, electrolytic corrosion and rusting can be suppressed even when the rim is made of different metals.

The electrically insulating film layer may be coated by another coating method, and it is effective to use a rim whose surface is insulated by electrodeposition coating, or an alumite-treated aluminum nipple.

〔Effect of the invention〕

As described above, the spoke wheel for a motorcycle or the like according to the present invention is a spoke wheel in which a large number of spokes are stretched between a hub and a rim, and the spoke wheel is connected to the rim and the spokes are removed from the spoke holes of the rim. An electrically insulating layer is interposed between the nipple screwed onto the end, and when the rim and nipple are made of dissimilar metals, it prevents rust due to galvanic corrosion and improves the appearance of the rim. It has the effect of being retained for a long time and increasing the durability of the function.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a rim and a nipple fastening part showing an embodiment of this invention, Fig. 2 is a perspective view of a washer showing an embodiment of this invention, and Fig. 3 is a washer attached to the nipple in Fig. 1. FIG. 4 is a sectional view of a nipple showing another embodiment of the invention, and FIG. 5 is a perspective view illustrating a spoke wheel. 1...Rim, 2...Nipple, 3...Spoke,
9゜10...Washer, 11...Nipple, 12.
...Electrical insulating film layer. Figure 1 Figure 22 Figure 32

Claims (1)

[Claims] A spoked wheel in which a large number of spokes are stretched between a hub and a rim, and an electrical insulating layer is interposed between the rim and a nipple screwed into the outer end of the spoke from a spoke hole in the rim. Spoke wheels for motorcycles, etc., which are characterized by