JPH01309801A - Wheel having small diameter - Google Patents

Abstract

PURPOSE:To ease tire-replacing work in a wheel which possesses a drum brake on one side of its split rim and a sprocket on the other side by constituting the wheel in such a manner that respective bolts for installing the rim or sprocket can alternately be arranged at an equal interval in the circumferential direction of the wheel. CONSTITUTION:A hub 14 located at the central part of a split rim 10 which can be split right and left and to which a solid tire 12 is attached is formed with a hub cylinder 16, a brake drum 18 that is welded near one side of this hub cylinder 16, and a radial, sprocket-installing plate 20 that is welded near the other side. A bolt 22 is welded to each of four radial pieces formed on the installing plate 20. In addition, the brake drum 18 is reinforced by a reinforcing plate 24 having almost the same shape with the installing plate 20, while a rim-installing bolt 26 is welded to the drum 18 in such a manner that the bolt 26 is situated between adjacent radial plates of a reinforcing plate 24. In addition, radial opennings 28 which have almost the same shape and through which the installing plate 20 or the reinforcing plate 24 can go are made in the rim 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a small diameter wheel having a split rim with a drum brake on one side and a chain drive sprocket on the other side.

(Background of the Invention) Some small-diameter wheels equipped with solid tires employ split rims. In this case, this rim must be bolted to the hub. On the other hand, when attaching a sprocket for driving a chain to this hub, it is necessary to securely attach a sprocket mounting plate to this hub side.

However, when attaching the rim from the sprocket mounting plate side across the outer periphery of the sprocket mounting plate in the axial direction, it is necessary to provide an opening in the rim to allow the sprocket mounting plate to pass through. However, especially with small diameter wheels,
It may become impossible to secure space for the bolts used to secure the rim to the hub, or the sprocket mounting plate may become an obstacle when attaching and removing these bolts, making it difficult to remove the bolts when disassembling the split rim and replacing the tire. There was a problem in that workability was extremely poor.

(Purpose of the Invention) The present invention has been made in view of the above circumstances, and it has been made to greatly improve the workability of attaching and detaching a split rim from a hub, making it easier to change tires, and to improve the workability of attaching and detaching a split rim to a hub. To provide a small-diameter wheel in which bolts can be placed easily.

(Structure of the Invention) According to the present invention, this object is to provide a small diameter wheel having a drum brake on one side of a split rim and a sprocket on the other side, a brake drum fixed to one side of a hub tube, A radial sprocket mounting plate is fixed to the other side of the hub cylinder, and a split rim is formed with a radial opening through which the sprocket mounting plate passes and is fixed to the brake drum. This is achieved by a small-diameter wheel characterized by having bolts arranged at equal intervals in the circumferential direction.

(Embodiment) Fig. 1 is a cross-sectional view of an entire embodiment of the present invention, Fig. 2 is a cross-sectional view showing the hub and rim thereof, and Fig. 3 is a cross-sectional view of the entire embodiment of the present invention.
A line sectional view, FIG. 4 is a right side view in FIG. 2, and FIG. 5 is a left side view.

In these figures, reference numeral 10 denotes a split-type rim that is divided into left and right parts, and a solid tire 12 is mounted on this rim 10. 14 is a hub, and this hub 14 is connected to the hub cylinder 1.
6, a brake drum 18 welded to the negative side of the hub cylinder 16, and a radial sprocket mounting plate 20 welded to the other side of the hub cylinder 16. This sprocket mounting plate 20 has a cross shape having four radiating pieces at equal intervals, and a bolt 22 is welded to each radiating piece by projection welding or the like. This bolt 22 projects in the opposite direction to the brake drum 18. The brake drum 18 is reinforced by a reinforcing plate 24. In other words, this reinforcing plate 24 is made to have almost the same shape as the sprocket mounting plate 20, and as can be seen by comparing FIG. The inner peripheral edge is welded to the hub cylinder 16 so that the inner peripheral edge is welded to the hub cylinder 16. Further, each radial piece of the reinforcing plate 24 is welded to the brake drum 18.

Therefore, a portion of the brake drum 18 appears between the four radial pieces of the sprocket mounting plate 20, that is, between the four radial pieces of the reinforcing plate 24 when viewed from the side. A rim mounting bolt 26 is projection welded to the brake drum 18 between the four radial pieces of the reinforcing plate 24, and this bolt 26 projects toward the sprocket mounting plate 20. As a result, four bolts 26 for mounting the rim,
The four bolts 22 for attaching the sprocket are approximately on the same radius and are alternately located at equal intervals in the circumferential direction.

On the other hand, the rim 10 is formed with a radial opening 28 having substantially the same shape through which the sprocket mounting plate 20 and the reinforcing plate 24 pass. This rim 10 is inserted into the hub tube 16 from the right side in FIG. 2, that is, from the sprocket mounting plate 20 side, and at this time, the opening 28 is aligned with the sprocket mounting plate 20 and the outer circumference of the sprocket mounting plate 20 is traversed in the axial direction. . Then pass the rim IO through the bolt 26 and tighten the nut 3.
Thread 0 and tighten with a box wrench (not shown). At this time, since each radiation piece of the mounting plate 20 is shifted in rotational direction from the bolt 26, the wrench does not interfere with the mounting plate 20, and the assembly work is easy.

After the rim 10 is attached to the hub 14 in this manner, the sprocket 32 is passed through the bolt 22 of the sprocket mounting plate 20 and tightened with a nut 34 to fix it. The thus assembled wheel is further attached with a brake shoe plate 36, and then assembled to the vehicle body, as shown in FIG.

An anchor pin 38, a camshaft 40, a brake shoe 42, a return spring 44, etc. are assembled in advance to the brake shoe plate 36, and this brake shoe plate 36 is mounted on the brake drum 18 to form a known drum brake. . The axle 46 passes through this brake shoe plate 36 and is further attached to a bearing 48.50 on the inner surface of the hub cylinder 16.
and passes through collars 52 and 54. The wheels are attached to the vehicle body by being held at both ends of the axle 46 by the rear end of a rear arm 56 or the like that holds the wheels.

In this embodiment, the sprocket mounting plate 20 and the openings 28 have a cross-shaped radial shape, but it goes without saying that the present invention can have various shapes, such as having three radiating pieces or five radiating pieces.

Moreover, it is not limited to solid tires that can be attached to the rim 10.
It may be a normal pneumatic tire.

[Effects of the Invention] As described above, the present invention makes the sprocket mounting plate fixed to the hub cylinder radial, provides an opening of approximately the same shape in the rim, and connects the rim mounting bolt and the sprocket mounting bolt in the circumferential direction. Because they are arranged alternately at equal intervals, tools do not interfere with the sprocket mounting plate when attaching and removing rim mounting bolts, which is necessary when dividing a rim and replacing a tire. Workability is good.Thus, the rim mounting bolts can be placed easily even though the wheel is small in diameter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the entire embodiment of the present invention, FIG. 2 is a sectional view showing the hub and rim, and FIG.
4 is a right side view of FIG. 2, and FIG. 5 is a left side view of FIG. 10...Rim, 12...Tire, 14...-
Hub, 16...Hub tube, 20...Sprocket mounting plate, 22...-Sprocket mounting bolt, 26...Rim mounting bolt, 28...-Opening. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] A small diameter wheel with a drum brake on one side of a split rim and a sprocket on the other side has a brake drum fixed to one side of the hub tube and a radial sprocket mounting plate fixed to the other side of the hub tube. and a split-type rim that is fixed to the brake drum and has a radial opening through which the sprocket mounting plate passes, and rim mounting bolts and sprocket mounting bolts are arranged at equal intervals in the circumferential direction. small diameter wheels.