JP2565307B2 - Wheel structure for motorcycles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wheel hub structure provided with a so-called wide tire of a motorcycle or the like, which is effective for use in reducing the weight thereof. So, convenient vehicles such as normal motorcycles and motorcycles (hereinafter referred to as "motorcycles")
It can be used as a wheel.

[Prior Art] For motorcycles traveling on a soft road surface, in order to widen the ground contact area of the tire to reduce the ground contact pressure of the wheel to prevent the wheel from sinking, and to drive on a wasteland such as a gravel road or a rocky area. For two-wheeled vehicles and the like, so-called wide tires are widely used in order to lower the tire air pressure to increase the cushioning capacity of the wheels and further to increase the load capacity of the tires.

As for a wheel on which this wide tire is mounted, an integral type wheel in which a rim, a disc or a spoke, a hub, a brake drum and the like are integrally formed is adopted because it is necessary to secure the rigidity thereof.

Since this conventional integrated wheel for a wide tire is manufactured by the aluminum cast molding method, it is unavoidable that the weight is increased due to restrictions of its structure, manufacturing method and the like. In a vehicle such as a motorcycle, weight reduction of wheels is urgently desired from the viewpoints of acceleration, braking, reduction of power loss, and operability of the vehicle. In order to reduce the weight of the wheel provided with this wide tire, it is desirable to adopt a composite spoke wheel in which rims, linear spokes, hubs, etc., which are separately formed, are combined.
However, for that purpose, it is a practical problem how to give the composite type spoke wheel a rigidity suitable for mounting a wide tire without increasing the weight. In order to deal with this problem, it is necessary to devise the structure as simple as possible and to ensure sufficient rigidity.

[Problems of the Invention]

The present invention aims to reduce the weight of a wheel such as a motorcycle equipped with a wide tire as much as possible, for which purpose a rim, a spoke, and a composite spoke wheel in which a hub is combined has a simple structure and a wide tire. The problem is to devise the structure so as to secure sufficient rigidity for mounting.

[Means taken to solve the problem]

The means taken to solve the above-mentioned problem is that "a hub body is rotatably supported by an axle fixed to a single frame or a fork via a pair of left and right bearings, and the hub body and the rim are provided with a large number of linear spokes. It is constituted by the following elements (a) to (d) on the premise of "a wide tire wheel connected with each other".

(A) The hub body is a hollow cylindrical body, and two plate-shaped stays axially separated from each other are fixed to the outer periphery of the hub body, and the end surface of the brake drum is brought into contact with the side surface of the disk-shaped portion of one of the stays. (B) The linear spokes were fixed to one of the above stays directly or via the brake drum, and the linear spokes were directly fixed to the other stay. (C) The left and right stays were fixed to the brake drum. The two stays are spaced axially inward from the bearings of the hub body, as long as the opening end and the stay do not project outside the side surface of the tire, and (d) are fixed to the end surface of the drum brake. A cylindrical portion bent toward the outside in the width direction of the vehicle body is formed on the inner circumference of the stay, and a cylindrical portion bent toward the inside in the width direction of the vehicle body is formed at the inner circumference portion of the other stay. upon A cylindrical portion that is fixed by welding are fitted to the hub body.

[Work]

The hub body, stay, and brake drum are separated from each other,
Since the hub body is a hollow cylinder, the stay,
The shape and structure of the brake drums can be made as simple as possible within the limits necessary to achieve their original functions, so that the hub body and stay can be made of thin-walled, lightweight and high-strength forged parts. .

Also, since the brake drum is attached to the hub body via one stay, the member for attaching the brake drum to the hub body can be omitted altogether.
The mechanism is simplified and the weight is reduced.

Further, since the end surface of the brake drum is abutted and fixed to the side surface of the disk-shaped portion of the one stay, the one stay is reinforced by the brake drum, and the rigidity against the lateral force is increased.

In addition, the left and right stays are separated as much as possible so long as the stays of the left and right sides of the brake drum do not project outward from the side surface of the tire, and the stays fixed to the end faces of the drum brakes are positioned outside the width direction of the vehicle body. To form a cylindrical portion that is bent toward the inside of the other stay, and a cylindrical portion that is bent toward the inner side in the width direction of the vehicle body is formed on the inner peripheral portion of the other stay. By welding and fixing, the deflection of the hollow cylindrical hub body can be minimized, and the stay strength and linear spoke support strength for the rim is high, and the rim can be supported more stably. The wheel rigidity is significantly improved.

〔Example〕

 Next, embodiments will be described with reference to the drawings.

The engine 11 is located in the lower center of the motorcycle body frame 10.
A pair of left and right rear arms 12 pivotally attached to the rear lower end of the body frame 10 are supported by a shock absorber 13, and an axle 20 of a rear wheel 14 is attached to the rear end of the rear arm 12.

Cylindrical part 23 of left and right stays 23, 24 on hub body 22 made of steel pipe
The a and 24a are fitted and welded and fixed. These stays 23 and 24 are umbrella-shaped stays made by pressing a steel plate, and both stays are largely separated from each other and fixed to the hub book 22. The stay 24 on the right side is a disk part in the radial direction.
241 and a conical portion on the outer circumference, and an end surface of the aluminum alloy brake drum 26 is brought into contact with the outer side surface of the disk-shaped portion 241, and is fixed by bolts and nuts. Since the conical part of the right stay 24 covers the brake drum 26,
The mounting positions of the linear spokes 36b are located on the outer periphery of the brake drum, and thereby the opening angle between the left and right linear spokes is increased.

Further, on the left end of the hub body 22 is a steel plate flange 22a.
Are fitted, welded and fixed, and the sprocket 34 is screwed and attached to the flange 22a.

The left and right linear spokes 36a and 36b are attached to a large number of spoke attachment holes 25 provided in the conical portions of the left and right stays 23 and 24, respectively. It is necessary to make the diameter as small as possible within the limit necessary to mount the linear spokes 36a, 36b.

Both ends of the hub body (22) are supported on the axle (20) via a pair of left and right rolling bearings (21), and a brake drum (26) is combined with a shoe plate (27) fixed to the right end of the axle (20) to form a brake. This combination of shoe plates 27
A brake shoe 29, which is attached via an anchor pin 28 or the like to the brake drum 26, is incorporated in the brake drum 26, and the opening end of the brake drum is closed by a shoe plate 27. Then, the stay 24 on the right side is arranged as close to the right side as possible as long as the opening end (right end) of the brake drum does not project outward from the right side surface 38a of the wide tire 38 mounted on the rim 35 in the tire width direction. There is.

The cam shaft 31 is rotatably attached to the shoe plate 27, and the brake lever 33 attached to the outer end thereof.
The cam shaft 31 is rotated by the operation. When the cam shaft 31 is rotated, the brake shoe is driven by the cam 32 at the inner end of the cam shaft.
29 is expanded and the brakes are applied.

To increase the distance between the left and right stays 23, 24, it is desirable to position the left stay 23 to the left as much as possible, but move the left stay 23 to the left of the position shown in the figure. Then, the tire 38 moves to the left of the position shown. On the other hand, the left end surface of the tire 38 must secure a predetermined space with respect to the chain 41 wound around the sprocket 34 located inside (right side) of the rear arm 12. The position of the left stay 23 is selected in consideration of these factors.

The above is the wheel structure of the rear wheel.
The front wheel 17 attached to the lower end of the wheel has the same wheel structure as the rear wheel.

Cylindrical part 53 of left and right stays 53, 54 on hub body 52 made of steel pipe
The a and 54a are fitted and welded and fixed. The stays 53 and 54 are manufactured by pressing a steel plate, and the stays are fixed to the hub body 52 with a large distance from each other. The stay 54 on the right side is a radial disk-shaped portion 541.
The end surface of the brake drum 56 made of aluminum alloy is brought into contact with the outer side surface of the disk-shaped portion 541 and fixed by bolts and nuts.

The left and right linear spokes 61a and 61b are respectively attached to the conical portion of the left stay 53 and a large number of spoke attachment holes 55 and 562 provided in the annular flange 561 on the outer periphery of the brake drum 56,
In order to reduce the weight and ensure the rigidity of both stays 53 and 54, it is necessary to make the diameter as small as possible within the limit required for attaching the linear spokes 61a, 61b or the limit required for attaching the brake drum. is there.

Both ends of the hub body 52 are supported on the axle 50 via a pair of left and right rolling bearings 51, and the brake drum 56 is combined with a shoe plate 57 fixed to the right end of the axle 50 to form a brake. With this combination shoe plate 57
The brake shoe 65 attached to the brake drum 56 via the anchor pin 64 is installed inside the brake drum 56, and the opening end of the brake drum is closed by the shoe plate 57, but the opening end (right end) of the brake drum is attached to the rim 60. The right stay 54 is arranged as close to the right side as possible, as long as it does not project outward from the right side surface 63a of the wide tire 63 in the tire width direction.

The cam shaft 58 is rotatably attached to the shoe plate 57, and the brake lever 59 attached to the outer end thereof.
By this, the cam shaft 58 is rotated. When the cam shaft is rotated, the brake shoe 6 is driven by the cam 58a at the inner end of the cam shaft.
5 is expanded and the brake is applied.

Stays 54 and 24 of front wheel 17 and rear wheel 14 are linear spokes 61b and 3
Since the support of 6b and the attachment of the brake drum are also performed, the member for exclusively supporting the brake drum is omitted and the weight of the wheel is reduced. Also, stay 5
Brake drum 5 with high rigidity in the disk-shaped parts 241, 541 of 4, 24
Since the end surfaces of 6 and 26 are brought into contact with each other and fixed by bolts and nuts, the stays 54 and 24 are reinforced by the brake drum and their rigidity is enhanced. In addition, 16 is a steering handle, 291 is a lining made of friction material on the outer peripheral surface of the brake shoe 29, 30 is a spring that biases the brake shoe 29 inward, 37 and 62 are nipples, 40 is a small diameter sprocket,
42 is a footrest, 43 is a brake pedal for operating the rear wheel brake lever 33, and 44 is a front wheel brake lever
This is a wire for operating the steering wheel 16 with 59.

〔The invention's effect〕

It has not been known in motorcycles and the like that a wide variety of tires are attached to a composite type spoke wheel in which rims, linear spokes, hubs, etc., each of which is made of a separate body, are mounted and put to practical use. The reason for this is as described in the section [Prior Art] above.

Therefore, for the first time to solve the above-mentioned problems (the [problem of the present invention]) that must be solved for practical use by mounting wide tires on the composite type spoke wheel,
It is an effect peculiar to the present invention that the wheel of a motorcycle or the like in which wide tires are mounted on the composite type spoke wheel can be put to practical use.

As a result, lightweight wheels such as motorcycles equipped with wide tires can be significantly reduced in weight, and acceleration, braking, reduction of power loss, and operability of these vehicles can be significantly improved. . It is an effect peculiar to the present invention that this effect is realized for a wheel such as a motorcycle equipped with wide tires.

In particular, it is a great industrial advantage of the present invention that a wheel equipped with a wide tire, which is significantly cheaper than an integrated wheel (commonly called an aluminum wheel), can be provided to the market as a wheel of a wide tire motorcycle.

Further, since the hub is a hollow cylindrical body having a simple shape, it can be manufactured by a steel pipe. Then, the left and right stays are separated as much as possible so far as the opening ends of the brake drum and the stays do not project outside the side surface of the tire, and the stays fixed to the end faces of the drum brakes are provided in the width direction of the vehicle body. A cylindrical part bent outward is formed, a cylindrical part bent inward in the width direction of the vehicle body is formed on the inner peripheral part of the other stay, and the cylindrical parts of both stays are fitted to the hub body. By welding and fixing the stays, the stay can be fixed by welding to the inside of the hub bearing in the axial direction. Therefore, the welding heat for this welding is prevented from distorting the fitting portion of the bearing. Therefore, the steel pipe is preliminarily cut to form a hub, and the stay is welded and fixed to the hub. A process can be adopted. Therefore, the hub with the stay can be easily manufactured, and the material and the processing time can be saved as compared with the one in which the stay and the hub are integrally molded by aluminum casting, and therefore, the manufacturing cost is reduced. It can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle having wheels fitted with wide tires, FIG. 2 is a sectional view of an embodiment in which the present invention is applied to a rear wheel (II-II sectional view of FIG. 1), and FIG. Is a sectional view of an embodiment in which the present invention is applied to a front wheel (III-III sectional view of FIG. 1)
Is. 20,50 …… Axle, 22,52 …… Hollow cylindrical hub body, 23,24,53,54 …… Stay, 26,56 …… Brake drum, 36a, 36b, 61a, 61b …… Linear spoke 38, 63 ... Wide tires.

Claims (1)

(57) [Claims] 1. A wide tire in which a hub body is rotatably supported by an axle fixed to a body frame or a fork via a pair of left and right bearings, and the hub body and rim are connected by a large number of linear spokes. In the wheel, the hub body is a hollow cylindrical body, and two technical stays axially separated from each other are fixed to the outer periphery of the hub body, and the end surface of the brake drum is brought into contact with the side surface of the disk-shaped portion of one of the stays. The linear spokes are fixed to one of the stays directly or through the brake drum, and the linear spokes are directly fixed to the other stay, and the left and right stays are fixed to the open ends of the brake drum and the stay of the tire. The two stays are separated from each other as far as they do not project outward from the side surface, and are bent outward in the width direction of the vehicle body on the inner circumference of the stay fixed to the end surface of the drum brake. And a cylindrical portion bent toward the inner side in the width direction of the vehicle body is formed on the inner peripheral portion of the other stay, and the cylindrical portions of both stays are fitted to the hub body to form the left and right pair. The structure of the wheel of the wide tire of the motorcycle, which is welded and fixed inside the bearing in the vehicle width direction.