JPH0924880A - Brake device for scooter type vehicle - Google Patents

Abstract

(57) Abstract: When a disc brake or a drum brake is adopted as a brake device in an engine unit swing type scooter type vehicle,
The structure such as the engine unit and the rear wheels can be commonly used with almost no change. SOLUTION: In a braking device for an engine unit swing type scooter type vehicle, an engine unit 6 is provided.
The rear wheel 8 is attached to one end of the rear axle 13 attached to the rear end, and the disc plate for disc brake is attached to the rear axle 13 on the opposite side of the engine unit 6 from the rear wheel 8. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a rear wheel of a scooter type vehicle using an engine unit swing system.

[0002]

2. Description of the Related Art An engine in which a front end portion of an engine unit having a power transmission means for transmitting engine rotation to a rear wheel is pivotally attached to a body frame in a swingable manner, and a rear wheel is attached to a rear end portion of the engine unit. In a scooter type vehicle adopting a unit swing system, a drum brake device is generally used as a brake device for the rear wheels.

That is, FIG. 4 is a side view of the engine unit swing type scooter type vehicle, in which a steering shaft 3 having a handle 2 mounted on the upper end is provided on the front upper portion of a body frame 1 formed in a U shape. Is mounted on the lower end of the steering shaft 3 of the front wheel 4
Is installed.

On the other hand, an engine suspension bracket 5 is projectingly provided at a lower center portion of the vehicle body frame 1, and a front portion of an engine unit 6 is swingably pivotably attached to the engine suspension bracket 5. The rear portion of the engine unit 6 is connected to the rear portion of the vehicle body frame 1 via the rear suspension 7, and the rear wheel 8 is attached to the rear portion of the engine unit 6.

FIG. 5 is a cross-sectional view of a shaft mounting portion of the rear wheel 8. A transmission case 11 having a reduction gear unit 10 built in is provided on one rear side of a crankcase 9 constituting the engine unit 6. A clutch cover 12 that covers a clutch portion (not shown) is attached to the other side of the front portion of the crankcase.

A rear axle 13 is rotatably supported by a bearing 14 at the rear portion of the mission case 11, and the rear axle 1
One end of 3 is pivotally supported by a bearing 15 provided on the inner surface of the crankcase 9, and the rear wheel 8 is attached to the other end of the rear axle 13 protruding outward from the transmission case 11.

A cylindrical brake drum 16 which is concentric with the rear axle 13 is integrally formed on the inner surface side of the rear wheel 8, that is, the surface side facing the transmission case 11, and the brake drum 16 is appropriately formed in the brake drum 16. A brake shoe 18 that is actuated by a brake lever 17 is provided, and the brake shoe 18 is used when the brake is actuated.
The inner surface of 6 is pressed.

By the way, there has been proposed a scooter type vehicle of the engine unit swing type which employs a disc brake instead of the drum brake device.

FIG. 6 is a view showing the construction of a disc brake device portion in a scooter type vehicle adopting the engine unit swing system. The rear wheel 8 mounted on the rear end portion of the mission case 11 has the mission described above. A disc plate 19 for a disc brake is fixed to the side opposite to the side surface of the case 11, and the mission case 1
A caliper 20 as a braking means fixed to the mission case 11 is arranged in a space formed by the rear wheel 8 and the wheel 1 so as to straddle the disc plate 19.

[0010]

However, in the case where the disc brake device is provided as described above, the disc brake devices 19 and 20 are arranged between the transmission case 11 and the rear wheel 8 because of the disposition. However, there is a problem that the structures of the rear wheel 8 and the mission case 11 and the like must be dedicated to them.

That is, when the drum brake and the disc brake are properly used, as shown in FIGS. 5 and 6, the structures of the rear wheel, the transmission case, and the like are different depending on the disc brake and the drum brake. However, there is a problem in that the cost of these molds becomes expensive and waste is increased.

In view of the above points, the present invention has an object to obtain a brake device for a scooter type vehicle capable of handling both a disc brake and a drum brake with a minimum die investment.

[0013]

SUMMARY OF THE INVENTION The present invention is a braking device for an engine unit swing type scooter type vehicle, in which a rear wheel is mounted on one end of a rear axle mounted on the rear end of the engine unit. At the other end, a disc brake disc plate was mounted on the opposite side of the crankcase from the rear wheel.

However, when the disc brake device is adopted, a shaft longer than that used when the drum brake device is used is used as the rear axle, and the axle is projected to the side opposite to the rear wheel with respect to the crankcase. Then, the disc plate may be attached to the projecting end portion, and the rear wheel and the crankcase can have a common structure for the disc brake or the drum brake.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a reduction gear unit 1 is provided on one side of a rear portion of a crankcase 9 constituting an engine unit 6.
0 is built in, and a clutch device 21 is attached to the front and the other side of the crankcase 9.
A clutch cover 12 is attached to cover the.

A rear axle 13 is axially supported by a bearing 14 at the rear of the mission case 11, and the rear axle 1
One end of 3 is projected outward from the mission case 11, and the rear wheel 8 is attached to the part projecting outward.

By the way, the rear axle 13 also penetrates through the crankcase 9 and projects toward the side opposite to the rear wheel 8. The bearing 15 provided in the crankcase 9 pivotally supports the intermediate portion of the rear axle 13. A disc hub 22 is spline-fitted to a portion of the rear axle 13 projecting to the side opposite to the rear wheel 8, and is fixed by a nut 24 with a washer 23 sandwiched therebetween. The disk plate 26 is fixed by the bolt 25. That is, the disc plate 26 and the rear wheel 8 are arranged on the left and right sides of the engine unit 6 so as to sandwich it.

As shown in FIGS. 2 and 3, a caliper 28 is mounted on a boss 9a provided on the crankcase 9 by a caliper bolt 27 so as to straddle the disc plate 26.

When the vehicle is being braked, however, the brake shoes are pressed against both surfaces of the disc plate 26 by operating the caliper 28, and the rear wheel 8 is braked.

By the way, comparing FIG. 1 and FIG. 5, in FIG. 1, the rear axle 13 is elongated, and the rear axle 13 penetrates the crankcase 9 and is projected to the side opposite to the rear wheel 8. A disc plate 26 is mounted on the protruding portion of the brake shoe 1 in the brake drum 16.
8 and its operating mechanism are removed.

Therefore, when a disc brake device is used in this type of vehicle, it is sufficient to form a through hole 30 for the rear axle 13 in the crankcase 9 and use the rear axle for the disc brake device. The crankcase 9, the transmission case 11 and the rear wheel 8 shown in FIG. 5 can be used as they are, and it is not necessary to change their parts depending on whether the disc brake device is used or the drum brake device is used. Disappear.

That is, the rear wheel and the transmission case are for a drum brake and can be used for both, and the crankcase can be used for both by simply installing a boss for mounting a disc caliper on the drum brake crankcase. Can be made.

[0024]

As described above, according to the present invention, the disc plate is arranged on the side opposite to the rear wheel so as to sandwich the engine unit. Therefore, when a drum brake or a disc brake is adopted, both are dealt with. The rear wheels, the mission case, and the crankcase do not have to have different structures, and the above-mentioned components can be shared in both cases.

Therefore, it is not necessary to prepare separate molds for both brakes, and the cost for the molds can be minimized.

[Brief description of drawings]

FIG. 1 is a sectional view of a brake device according to the present invention.

FIG. 2 is an explanatory view of a caliper portion of the brake device of the present invention.

FIG. 3 is a side view showing a state in which a clutch cover of the engine unit is removed.

FIG. 4 is a side view of an engine unit swing type scooter type vehicle.

5 is a sectional view of a drum brake device portion of the scooter type vehicle shown in FIG.

6 is a cross-sectional view of a conventional disc brake device unit in the scooter type vehicle as shown in FIG.

[Explanation of symbols]

 1 Body Frame 5 Engine Suspension Bracket 6 Engine Unit 8 Rear Wheel 9 Crankcase 11 Mission Case 12 Clutch Cover 13 Rear Axle 16 Brake Drum 19,26 Disc Plate 20,28 Caliper 22 Disc Hub

Claims (1)

[Claims] 1. A braking device for an engine unit swing type scooter type vehicle, wherein a rear wheel is attached to one end of a rear axle attached to the rear end of the engine unit, and the rear wheel is attached to the engine unit. A brake device for a scooter type vehicle, wherein a disc plate for a disc brake is attached to the other end of the rear axle on the side opposite to the side.