JPS6234801A - Wheel for motorcycle or the like - Google Patents

Abstract

PURPOSE:To strike the bead section of a tire against recesses so as to prevent the tire from vibrating against the rim and to obtain an easy assemble work of the tyre by forming a number of recesses along the circumferential direction in a well section formed on the outer circumferential surface of a cast rim. CONSTITUTION:A wheel 1 is composed of a hub which is rotatably supported by an axle, a rim 3 which is provided coaxially with the hub 2, spokes which join each of the said items 2 and 3 together, and a tire which is fitted on the outer circumference of the rim 3. In this configuration, a recess 8 in a rectangular form is formed roughly at the center of the width in the well section which is formed around the outer circumferences of the rim 3. And a number of recesses 8 is formed along the circumferential direction at regular intervals so as to form a sort of the combination of recesses and projections continuously in the well section 7. When the tire is fitted onto the rim 3, this configuration enables the bead section of the tire to be struck against the surface of the combination of recesses and projections in the well section 7 so as to prevent the tire from vibrating against the rim 3, accordingly the tire can be easily fitted on.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wheel for a motorcycle or the like that allows easy installation of a tire.

(Prior Art) Some motorcycle wheels have a rim cast from a light alloy, and the outer circumferential surface of this rim is usually formed to be flat in the circumferential direction.

In addition, in the above structure, in order to make the wheel lightweight, there is one in which a large number of through holes are formed in the rim and a lightweight resin closing plate is fitted into the through holes (for example,
-49602).

(Problem to be solved by the invention) By the way, how do you assemble the tire to the rim?

First, a circumferential portion of the bead portion of the tire is fitted into a well portion of the rim, and the bead portions connected to this portion are sequentially fitted into the well portion.

In this case, an external force is applied to the tire when attempting to elastically deform the bead portion. At this time, if the tire slides circumferentially relative to the rim due to this external force, the tire cannot be assembled smoothly, so it is necessary to assemble the tire while preventing this relative rotation. but,
In this way, fitting the bead portion into the well portion while preventing rotation of the tire relative to the rim is time-consuming and complicated.

Furthermore, if a through hole is formed in order to reduce the weight of the rim as in the conventional configuration, a separate member is required to close the through hole, which causes the disadvantage that the wheel configuration becomes complicated.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and aims to make it easier to assemble a tire to a rim and to reduce the weight of the rim with a simple structure. do.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a large number of four parts are formed in the well part formed on the outer peripheral surface of the rim along the circumferential direction of the rim.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 is a wheel used for a motorcycle, and this wheel 1 includes a hub 2 supported on an axle (not shown), a rim 3 provided coaxially with the hub 2, and spokes 4 connecting the hub 2 and the rim 3. and a tire 5 fitted on the outer peripheral side of the rim 3.

The hub 2, rim 3, and spokes 4 are integrally formed by casting a light alloy.

A well portion 7 is formed on the outer peripheral surface of the rim 3, and a rectangular four portion 8 is formed approximately at the center of the well portion 7 in the width direction. A large number of the recesses 8 are formed at equal intervals along the circumferential direction of the rim 3. Therefore, an uneven surface is continuously formed in the well portion 7 along the circumferential direction.

Furthermore, reinforcing ribs 9 are provided protruding from the inner circumferential surface of the rim 3. This rib 9 is provided at approximately the center position in the width direction of the rim 3 so as to correspond to the four portions 8 in the radial direction of the rim 3. This rib 9 prevents the cross-sectional shape of the rim 3 from becoming thinner at the bottom of the recess 8 and ensures good overflow during casting.

The tire 5 is attached to the outer peripheral side of the rim 3 with its bead portions tt and ii fitted into the well portion 7 of the rim 3.

When assembling the tire 5 to the rim 3, first, a part of the bead 11 of the tire 5 in the circumferential direction is fitted into the well part 7 of the rim 3 (as shown by the dashed line in FIG. 1), and then The continuous bead portions 11 are sequentially fitted into the well portion 7. In this case, an external force is applied to the tire 5 to elastically deform the bead portion 11, and the tire 5 tends to slide in the circumferential direction with respect to the rim 3. shall be. However, since the bead portion 11 is in elastic contact with the uneven surface of the well portion 7 formed by the recess portion 8, and the frictional force between the two is large, this sliding of the tire 5 is prevented. .

Furthermore, when the bead portion 11 comes into elastic contact with the uneven surface of the well portion 7 as described above, in order to prevent the bead portion 11 from being damaged by this contact, the opening edge 8a of the recess portion 8 is provided with a sweetfish-shaped arc shape. It has been chamfered.

(Effects of the Invention) According to the present invention, a large number of recesses are formed along the circumferential direction of the rim in the well portion formed on the outer peripheral surface of the rim, thereby forming an uneven surface in the well portion. When assembling the tire, the bead portion of the tire comes into contact with the uneven surface of the well portion, preventing the tire from sliding against the rim. Therefore, since the tire can be attached to the rim without paying attention to the sliding of the tire, the tire can be easily attached to the rim.

Furthermore, since a large number of concave portions are formed in the well portion, the weight of the rim can be reduced accordingly. In this case, the means for reducing the weight of the rim is not a through hole as in the prior art, so there is no need for a separate member such as a closing plate as in the prior art. Therefore, the rim can be made lightweight with a simple configuration.

Furthermore, since a large number of concave portions are formed in the well portion, the surface area of the rim increases accordingly, and cooling during casting is performed quickly. This prevents casting defects such as sink marks from occurring. In addition, by forming a large number of the above-mentioned recesses,
Excessively thick portions of the rim can be reduced, thereby preventing casting defects such as pinholes.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures show an embodiment of the invention, and FIG. 1 is a sectional view of the rim;
FIG. 2 is a perspective view of the wheel with the tire omitted, and FIG. 3 is a partial plan view of the rim. 1.Wheel, 3.E rim, 7. φ Uwel part, 8..Concave part. Patent applicant Yamaha Motor Co., Ltd. Figure 1

Claims (1)

[Claims] 1. A wheel for a motorcycle or the like having a cast rim, characterized in that a well portion formed on the outer peripheral surface of the rim has a number of recesses formed along the circumferential direction of the rim.