JPS6141676Y2 - - 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 brake disc is poor. In order to improve this problem, the conventional approach was to increase the area of the brake disc to improve the heat dissipation effect.

However, increasing the brake disc area is not preferable because it is restricted by the relationship with the wheel hub and increases the weight of the vehicle.

The present invention relates to an improvement of a disc brake device that overcomes these difficulties.The purpose of this invention is to provide sufficient cooling performance even when the brake disc has a small diameter, and to provide an inner brake system that prevents foreign matter from entering from the outside. The present invention provides a disc brake device for type motorcycles.

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

Reference numeral 1 denotes a front axle whose both ends are fixed to a front fork 2. A wheel hub 4 is rotatably supported on the front axle 1 via a bearing 3, and a rim 5 on the outer periphery of the wheel hub 4 (not shown) Tires are about to be installed.

In addition, the wheel hub 4 includes a
Attachment bosses 6 that protrude on both sides and in the radial direction are integrally formed at intervals of 120°. A brake disk 7 is provided with a plurality of radially extending ribs 9 defining cooling air passages 8.
A holding piece 1 is attached to the outer circumference of the boss 6 on both sides in the circumferential direction.
A protrusion 10 is formed so as to be able to be clamped through the brake disc 1, and is adapted to be removably fitted into the mounting boss 6 of the wheel hub 4 by moving the brake disc 7 in the axial direction.

Furthermore, the brake disc 7 is fixed to the wheel hub 4 by bolts 12 via an annular body 13 having jaws that cover the outer surface of the protrusion 10 and the outer surface of the boss 6 in the fitted state. There is.
The annular body 1 for fixing the brake disc 7
3 is formed as a centrifugal cooling fan for discharging cooling air having a plurality of blades 14, and the annular body 13 and the flange 4a of the wheel hub 4 define an air discharging space.

Furthermore, a perforated plate is attached to the annular body 13 with screws or the like so as to cover the entire inner side of the wing piece 14 from the inner periphery.

On the other hand, a side panel 16 that covers the outside of the brake disc 7 and has a cooling air inlet 17 is supported by the front wheel 1.
A perforated plate 18 that blocks the cooling air inlet 17 from the inside and does not impair ventilation is attached with screws or the like (see other embodiments shown in FIG. 3, described later).

Further, on the side panel 16, a caliper 19 is provided with a pair of friction pads 20, which are located rearward from the front axle 1 and have a pair of friction pads 20 that face both sides of the brake disc 7 and can come into and out of sliding contact with the brake disc 7. The pair of friction pads 20 are integrally attached across the inner periphery, and are pressed against both sides of the brake disc 7 by the operation of the caliper piston 21 to apply the brakes.

The embodiment shown in FIG. 1 and FIG. , the wheel hub 4 is braked.

Further, since the blades 14 are integrally attached to the annular body 13 as a centrifugal cooling fan adjacent to the outer periphery of the brake disc 7, the blades 14 are rotated as the wheel hub 4 rotates, and the cooling air is The air flows into the brake disc storage chamber defined by the side panel 16 and the wheel hub 4 through the cooling air inlet 17, flows along the surface of the brake disc 7, and is directed to the outside by the cooling fan composed of the blades 14. As a result of the exhaust, the brake disc 7, friction pad 20 and caliper 19 are effectively cooled.

Further, since the cooling fan is disposed around the outer circumference of the brake disc 7, even if the brake disc 7 has a small diameter, excellent cooling performance can be obtained by the cooling fan that rotates at high speed during running. In addition, a plurality of radially extending ribs 9 defining cooling air passages 8 toward the blades 14 are provided in the thick interior of the brake disc 7.
As a result, the brake disc 7 is exposed not only to both outer surfaces but also to the inside of the cooling air passage 8, and the cooling air flowing through the cooling air passage 8 is forcibly discharged in a radial direction by the cooling fan. and provides excellent cooling performance.

Furthermore, the perforated plate 1 covers the inner side of the wing piece 14.
5 blocks the cooling air inlet 17 of the side panel 16 from the inside, and a perforated plate 18 is attached to each of them, so that foreign matter does not enter the annular body 13 and the inside of the side panel 16 (brake disc storage chamber). (earth and sand, pebbles, etc.) are prevented from entering, and the heat dissipation effect of the brake disc 7 is not hindered by contamination.

Furthermore, since the perforated plates 15 and 18 can be manufactured with higher dimensional accuracy than wire mesh or the like, they are easy to install and have high installation accuracy.

In addition, since the perforated plates 15 and 18 are installed in the brake disc storage chamber, the appearance is good.
No need to worry about damage.

In the above embodiment, a ventilated brake disc having a cooling air passage inside the flange wall was used, but it is not necessarily necessary to use a ventilated brake disc.

In the above embodiment, the front wheel disc brake device has been described. Next, the attachment relationship between the side panel and the perforated plate in the rear wheel disc brake device will be described with reference to FIG. 3.

A notch 32 for attaching a caliper and a pair of screw holes 33 are formed in the side panel 30, and a large number of cooling air inlets 31 are arranged in a fan shape.

On the inner surface of the side panel 30 (the side surface on the back side of the paper in FIG. 3), a semi-annular perforated plate 34 is provided with a screw 35 so as to block the cooling air inlet 31. Can be mounted at three points.

If the perforated plate 34 is attached to the side panel 30 in this manner, it becomes possible to attach it with sufficient strength and high precision as described above.

As is clear from the above explanation, in the present invention, the brake disc is disposed in the brake disc storage chamber defined by the wheel hub on one side that supports the brake disc and the side panel on the other side, and A cooling air inlet is provided in the panel, and is located near the outer periphery of the brake disc and in an air exhaust gap formed by the side panel and the wheel hub to exhaust air in the brake disc storage chamber to the outside. A centrifugal cooling fan is attached to the wheel hub, and a perforated plate is attached to the inside of the side panel to block the ventilation of the cooling air inlet without impairing it. Since the plate is provided, the air in the brake disc housing chamber and the air inside the brake disc are actively discharged in the radial direction of the brake disc, and along with this, outside air is taken into the brake disc housing chamber. Therefore, during driving, the temperature of the brake disc storage chamber is always maintained at the same level as the outside air, and the brake discs are cooled extremely effectively.
Moreover, perforated plates have been installed in the side panel cooling air inlet and in the air exhaust space formed between the side panel and the wheel hub to prevent airflow from being impaired. This effectively prevents the entry of foreign objects such as pebbles, mud, and sand due to the entry of outside air, and maintains the cleanliness of the brake disc. As a result of keeping the brake disc clean, heat is efficiently radiated from its surface.

Furthermore, by providing the perforated plate with a certain degree of rigidity, the mating member to which it is attached is reinforced, and a sufficiently high accuracy of attachment is ensured.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of a disc brake device for a motorcycle according to the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a porous hole in another embodiment of the present invention. FIG. 3 is an exploded perspective view showing the attachment relationship between the plate and the side panel. 1...Front axle, 2...Front fork, 3...
...Bearing, 4...Wheel hub, 5...Rim, 6...
... Boss, 7 ... Brake disc, 8 ... Cooling air passage, 9 ... Rib, 10 ... Projection, 11 ... Holding piece, 12 ... Bolt, 13 ... Annular body, 14 ...
... Wing piece, 15 ... Perforated plate, 16 ... Side panel, 17 ... Cooling air inlet, 18 ... Perforated plate, 1
9... Caliper, 20... Friction pad, 21...
...Caliper piston, 30...Side panel,
31...Cooling air inlet, 32...Notch, 33...
...screw hole, 34...perforated plate, 35...screw.

Claims (1)

[Scope of Claim for Utility Model Registration] In a disc brake device comprising a brake disc disposed in a brake disc storage chamber defined by a wheel hub on one side that supports the brake disc and a side panel on the other side. , a cooling air inlet is provided in the side panel, and is located near the outer periphery of the brake disc and in an air exhaust gap formed by the side panel and the wheel hub, so that the air in the brake disc storage chamber is vented to the outside. A centrifugal cooling fan is installed on the wheel hub, and the airflow from the cooling air inlet is not impaired.
A disc brake device for a motorcycle, characterized in that a perforated plate for blocking this is attached to the inside of a side panel, and a perforated plate for covering the centrifugal cooling fan from the inner periphery.