JPS6112291Y2 - - Google Patents

Description

[Detailed description of the invention] In conventional disc brake devices for motorcycles, the brake disc, which is integrally and concentrically attached to one or both sides of the wheel hub, is exposed to the outside air, so the friction generated during braking is reduced. Heat is sufficiently dissipated by the airflow that accompanies driving, but in inner-type disc brake systems where the brake disc is sealed with a side panel, the brake disc is not exposed to the outside air, so heat dissipation from the disc is reduced. In order to improve this problem, conventional methods have been to increase the disk area or use a ventilated type to improve the heat dissipation effect.

However, increasing the disk area is not preferable because it is restricted by the relationship with the wheel hub and also increases the weight of the vehicle. In addition, even if the disk is formed in a ventilated type, sufficient heat dissipation effect cannot be expected unless the diameter of the disk is large.
There were problems such as the cooling passage being blocked due to the intrusion of heat, resulting in a reduction in the heat dissipation effect.

The purpose of this project is to improve a disc brake device for motorcycles that overcomes these difficulties.The purpose of this project is to have sufficient cooling performance even when the disc has a small diameter, and to prevent foreign matter from entering the disc from the outside. An object of the present invention is to provide an inner-type disc brake device for a motorcycle that prevents the intrusion of.

An embodiment of the present invention shown in FIGS. 1 and 2 will be described below.

Reference numeral 1 denotes a front wheel axle whose both ends are fixed to a front fork 2. A front wheel hub 4 is rotatably supported on the front wheel axle 1 via a bearing 3, and is attached to a rim 5 on the outer periphery of the hub 4. rear tires are now being installed.

Further, the hub 4 is integrally formed with mounting bosses 6 that protrude on both sides and in the radial direction at intervals of 120° in the circumferential direction. A protrusion 10 is provided on the outer periphery of the brake disc 7 on which a plurality of radially extending ribs 9 defining a cooling air passage 8 are formed so that the brake disc 7 can be clamped. By moving the disk 7 in the axial direction, the disk 7 is removably fitted into the mounting boss 6 of the hub 4.

Furthermore, the disk 7 is fixedly attached by bolts 12 via a cover 13 having jaws that cover the outer surface of the protrusion 10 and the outer surface of the boss 6 in the fitted state. ing.

The disk fixing cover 13 is ring-shaped and has a centrifugal cooling fan 14 for discharging cooling air.
The plurality of blade portions 14a of the cooling fan 14 extend along the longitudinal direction of each rib 9, and the main body of the cover 13 and the flange 4a of the hub 4 serve as cooling air discharge passages. It forms a partition wall.

Furthermore, a wire mesh 15 is attached to the cover 13 with screws or the like so as to cover the entire inner peripheral surface of the blade portion 14a of the cooling fan 14.

On the other hand, a side panel 16 having a cooling air inlet 17 is formed so as to cover the outside of the disk 7, and the side panel 16 includes: wire mesh 18
is attached with screws etc.

Further, the side panel 16 includes the disk 7 at a location located rearward from the axle 1.
A caliper 19 having a pair of pads 20 facing each other on both sides of the caliper piston 2 is integrally installed so as to straddle the disc 7 from the inner periphery.
0, the disc 7 is brought into pressure contact with both sides of the disc 7, and a brake is applied.

The embodiment shown in FIGS. 1 and 2 is constructed as described above, so that when the caliper piston 21 of the caliper 19 is operated, the pair of pads 20 are brought into pressure contact with both sides of the disk 7. Then, the hub 4 is braked.

Further, since a cooling fan 14 is integrally provided on the cover 13 adjacent to the outer peripheral surface of the disk 7, the rotation of the hub 4 also causes the cooling fan 14 to rotate.
4 is rotationally driven, and the cooling air is supplied to the cooling air inlet 17.
It flows into the side panel 16, flows along the disk 7, and is discharged to the outside by the cooling fan 14, so that the disk 7, pad 20, and caliper 19 are cooled.

Since the cooling fan 14 is disposed around the outer periphery of the disk 7, even if the disk 7 has a small diameter, the cooling fan 14 can rotate at a sufficiently high circumferential speed, resulting in high cooling performance.

Moreover, the disk 7 is provided with a cooling fan 14.
A plurality of radially extending ribs 9 defining cooling air passages 8 are formed so that the disk 7 can be smoothly connected to the inner edge of the blade portion 14a of the disk 7. The cooling air also comes into contact with the passage 8, and the cooling air flowing through the cooling air passage 8 is smoothly sucked into the fan 6, further improving the cooling performance.

In addition, since a wire mesh is attached to the inner circumferential surface of the cooling fan 14 and also to the inside of the cooling air inlet 17 of the side panel 16, foreign matter (earth, sand, pebbles, etc.) can get into the cover 13 and the side panel 16. ) is prevented from entering, and the heat dissipation effect of the disk 7 is not hindered.

In addition, since the wire mesh is located inside the device, it looks good and there is no fear of damage.

Furthermore, the disk 7 has an outer peripheral protrusion 1
Since it is engaged with the boss 6 of the hub 4 at 0,
The braking force acting on the disc 7 can be easily and reliably transmitted to the hub 4.

In the illustrated embodiment, the wire mesh is attached to the inner peripheral surface of the cooling fan 14 and the cooling air inlet 1 of the side panel 16.
However, in order to prevent foreign matter from directly hitting the cooling air passage of the disk 7 during driving, it is sufficient to stick it only to the inner circumferential surface of the cooling fan 14 to obtain a sufficient effect. I can demonstrate it.

Furthermore, although a ventilated brake disc was used in the above embodiment, it is not necessarily necessary to use a ventilated brake disc.

Further, in the above embodiments, the present invention is applied to the front wheel, but the present invention can also be applied to a rear wheel having a brake disc on one side.

As described above, the present invention provides an inner-type disc brake device for a motorcycle, which includes a brake disc fixed to the side surface of a wheel hub, and a caliper member having a pair of pads facing each other on both sides of the disc. , a side panel provided with a cooling air inlet, a cooling fan disposed on the outer periphery of the disk separately from the disk, and a net stretched around the inner periphery of the roots of the plurality of blades of the cooling fan. Because of this feature, it is possible to prevent foreign matter from entering from the cooling fan portion forming the cooling air outlet, and the brake disc can be sufficiently cooled by the cooling fan.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a disc brake device for a motorcycle according to the present invention, and FIG. 2 is a cross-sectional view taken along the - line in FIG. 1. 1... Front wheel axle, 2... Front fork, 3... Bearing, 4... Front wheel hub, 4a... Flange, 5... Rim, 6... Boss, 7... Brake disc, 8...
...Cooling air passage, 9...Rib, 10...Protrusion, 1
1...Retainer, 12...Bolt, 13...Cover, 14...Cooling fan, 14a...Blade portion,
15... wire mesh, 16... side panel, 17...
Cooling air inlet, 18... wire mesh, 19... caliper, 20... pad, 21... caliper piston.

Claims (1)

[Scope of utility model registration request] A brake disk fixedly attached to the side surface of the wheel hub, a caliper member having a pair of pads facing each other on both sides of the disk, a side panel having a cooling air inlet, and on the outer periphery of the disk, A disc brake device for a motorcycle, comprising: a cooling fan disposed separately from the disc; and a net stretched around the inner periphery of a plurality of blades of the cooling fan.