JPH09250577A - Disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat distortion and remove or decrease external stress by constituting a brake disk of plural divided disks, having a ring state as a whole in a rotation direction, to provide divided gaps among adjoining end parts of the divided disks. SOLUTION: A brake disk 8, having a ring state as a whole, is constituted of three divided disks 10, divided into three in a rotation direction, and an end part 11 in the rotation direction is formed obliquely, so that, an outer peripheral side tip 11a can be protruded long in the rotation direction from an inner peripheral side tip 11b, and the other side end part 12 is made a reverse direction. These divided disks 10 are formed of ceramic reinforcing metal group composite material, to fit the divided disks 10 to a rim 7 by fastening bolts 13 with the divided gaps 15 provided among the respective disks 10. Consequently, stress, generated in the brake disk 8, is not increased, despite an excessive load is applied to a front wheel l, to remove or reduce external stress, to quickly escape the heat of the disks 10 to the rim 7, having much heat mass, at the time of braking, thereby cooling the heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device for a motorcycle.

[0002]

2. Description of the Related Art In Japanese Utility Model No. 60-60385, automatic 2
A disc brake device is shown in which a ring-shaped brake disc is attached to the rim of a wheel that constitutes a front wheel for a wheeled vehicle.

A groove for cleaning the brake pad is formed on the side surface of the brake disk.

Further, such a brake disk is
It is also known to manufacture it by casting or the like using MMC (metal matrix composite material) made of a suitable metal matrix such as aluminum.

[0005]

When the brake disc is attached to the rim in this manner, heat generated by the brake disc during braking can be released to the rim, and the cooling performance is improved.

In particular, when the brake disk is made of an aluminum alloy material, the cooling performance can be improved, so that the brake disk can be used without any problem in terms of cooling and the unsprung load can be lightened.

However, the disk brake has the following problems because it has a ring-like shape.

Due to the heat generation, the whole is thermally deformed into a cone shape, and bending stress is generated in the tightening bolt. Especially when the brake disk is made of an aluminum alloy material, it is necessary to quickly cool the heat generation.

When an excessive load is applied to the wheel from the ground or the like, large external stress is generated on the entire wheel.

Since the brake disc is formed in a relatively large ring shape, the material yield is low, and heating and polishing during manufacturing are expensive. Especially when using MMC,
If the number of units that pass through the continuous furnace for heat treatment in a unit time is not increased as much as possible, cost will be incurred.

In order to attach / detach the brake disc to / from the wheel, the front wheels must be removed from the front fork without fail, which limits the assembling procedure.

[0012]

In order to solve the above-mentioned problems, the present invention provides a disc brake in which a brake disc is mounted on the side surface of a wheel of a vehicle. It is characterized in that it is composed of a plurality of divided disks and that a divided gap is provided by separating adjacent ends of adjacent divided disks.

At this time, the brake disk can be attached to any of the wheel rim, the hub, and the spokes.

Further, each divided disk can be a common member.

Further, it is possible to make the end portion of the split disk in the rotating direction slanted and fix the leading side to be braked first by the brake caliper to the wheel.

Furthermore, the wall thickness of the end portion in the rotation direction of the divided disk can be tapered so that the tip side becomes gradually thinner in the rotation direction.

In addition, the split disk can be made of a ceramic reinforced aluminum composite material.

[0018]

When the brake disk is composed of a plurality of divided disks and a gap is provided between the adjacent ends of the divided disks, even if thermal deformation occurs due to heat generation during braking, it does not continue in a ring shape. Therefore, unlike a ring-shaped brake disc, it does not deform into a cone.

Therefore, the thermal strain is reduced, and the bending stress on the tightening bolt can be suppressed.

In addition, even if excessive load is applied to the wheel,
This external stress can be eliminated or reduced because the ends of the divided disks in the rotation direction are separated.

Further, the sliding surface of the brake pad can be cleaned by the divided gap provided between the divided disks.

In addition, if each divided disk is used as a common member, it is sufficient to manufacture only one type of divided disk, which is a member having a size of about 1/3 of the conventional size, so that the manufacturing is easy. Moreover, the material yield is improved, and the heating and polishing costs during manufacturing can be reduced.

Further, the brake discs can be attached / detached to / from the wheel, since the divided discs can be attached / detached at any time regardless of whether or not the wheel is attached to the vehicle body.

This brake disc can be mounted on any of the rim, hub, and spokes. Particularly, when mounted on the rim, the entire diameter of the brake disc can be increased and heat generated during braking can be released to the rim having a large heat mass. Therefore, it is suitable for a brake disk made of an aluminum alloy material.

Further, since the end of the split disk in the direction of rotation is slanted and the leading side is fixed to the wheel, the brake pads of the caliper slide smoothly even if the end of the direction in the direction of rotation slightly deviates from the rotating surface due to deformation or mounting accuracy. It can move and reduce the generation of abnormal noise and abnormal wear.

The same effect can be obtained by changing the wall thickness of the end portion in the rotational direction so that the wall thickness gradually decreases in the rotational direction. In addition, it is also possible to arbitrarily combine these.

Moreover, when the divided disks are made of a ceramic reinforced aluminum composite material, various performances required for the brake disk can be improved, and the unsprung load can be reduced due to the weight reduction.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment is shown in FIGS. 1 is a side view of a front disc brake device for a motorcycle, FIG. 2 is a sectional view taken along line 2-2, FIG. 3 is an enlarged side view of a caliper portion, and FIG. 4 is a sectional view taken along line 4-4 of FIG. .

First, in FIGS. 1 and 2, the front wheel 1 is mounted on the axle 3 at the lower ends of a pair of left and right front forks 2.
Is supported through.

The front wheel 1 is composed of a tire 1a and a wheel 4, and the wheel 4 is connected to a hub 5 supported by the front fork 2 via an axle 3, spokes 6 extending radially from the hub 5, and tip portions thereof. The rim 7 and the rim 7 are made of an appropriate material such as aluminum alloy or steel.

A brake disk 8 having a substantially ring shape as a whole is attached to the side surface of the rim 7.

The brake disk 8 is composed of three divided disks 10 which are divided into three in the rotation direction.

Each of the divided disks 10 uses the same member in common and is formed in an arc shape so as to form one ring as a whole, and the rotation direction (arrow X ) End portion 11 of the outer peripheral side
The a is formed obliquely so as to project longer in the rotation direction than the inner peripheral side tip 11b, and the other end 12 is inclined in the opposite direction.

As a result, the outer peripheral end 11a comes into sliding contact with the brake pad (described later) of the brake caliper before the inner peripheral end 11b during rotation, and is on the leading side of the brake caliper.

As is apparent from FIG. 4, both ends 11, 12 are
In each case, the tapered portion 14 has a wall thickness that gradually changes so as to become thinner toward the tip side. The taper portion 14
May be formed only on the side of the end portion 11 in the rotation direction.

Further, each divided disk 10 is attached to the boss 9 (FIG. 2) formed on the side surface of the rim 7 by tightening bolts 13 at the outer peripheral portion of each divided disk 10 at a total of three places at both ends and in the middle. ing.

In particular, the tightening bolt 13 on the side of the end portion 11 in the rotational direction is located in the rotational direction beyond the tip 11b on the inner peripheral side. Further, the tightening bolt 13 in the middle portion is a base portion of the spoke 6. However, the tightening bolt 13 does not necessarily have to be an end portion, and the number of attachment points thereof is arbitrary.

The brake disk 8 is separated from the ends 11 and 12 of the adjacent divided disks 10, and an oblique divided gap 15 is formed there. The outer circumference of the divided gap 15 is the leading side. It is inclined.

A brake pad 21 of a brake caliper 20 is slid by a piston 22 on the side surface of the divided disk 10 for braking.

The brake caliper 20 is attached to the stay 24 of the front fork 2 with a bolt 25.

Such a divided disk 10 can be molded from a ceramic reinforced metal matrix composite material. In particular, an alumina reinforced metal matrix composite material or a ceramic reinforced aluminum composite material using aluminum as a metal matrix (hereinafter, these are collectively referred to as an aluminum composite material) is suitable.

An example of such an aluminum composite material is PRIMEX (registered trademark) manufactured by Rankside Co., Ltd.
There is known a method called a method in which a metal matrix is impregnated into a preform of a ceramic reinforcement material without pressure.

By using this ceramic-reinforced metal matrix composite material or ceramic-reinforced ceramic matrix composite material, physical properties suitable for a brake disk can be obtained in various characteristics such as heat resistance, wear resistance and rigidity, and the constituent metal is aluminum. If the system is used, further weight reduction can be realized and it can contribute to the reduction of the unsprung load.

In this method, there is a step of infiltrating the heating metal through the continuous heating furnace, but since the divided disk of the present invention is smaller than the conventional ring-shaped one, the number of pieces passing through the continuous heating furnace in a unit time is reduced. More can be done, and the molding efficiency is improved.

The divided disk of the present invention is not limited to the above aluminum-based MMC, and MMC in which various ceramics and metal bases are combined is possible. Furthermore, such M
Conventional steel or the like can be used regardless of MC.

Next, the operation of the present embodiment will be described. The split discs 10 are arranged in the rotational direction while the split gaps 15 are provided between the wheels 4, and are attached to the rim 7 with the tightening bolts 13 to form a substantially ring-shaped brake disc 8.

Since the brake disc 8 is divided into three divided discs 10, even if the front wheel 1 is attached to the front fork 2 in advance, the divided discs 10 can be attached and detached at any time. Unlike the single ring, the order of steps is not limited, so that the assembling property is improved.

Further, even if an excessive load is applied to the front wheels 1, the stress generated in the brake disk 8 is not increased because the individual divided disks 10 are separated, and the external stress is removed or reduced. To be done.

Further, during braking, the split disk 10 generates heat, but this heat quickly escapes to the rim 7 having a large heat mass and is cooled.

Therefore, since the cooling performance is improved, the disc brake can be sufficiently used even if it is made of an aluminum material, and the weight of the brake disc 8 can be reduced to reduce the unsprung load, and the automatic two-wheel system can be used. It is suitable for cars.

Moreover, since the brake disc 8 can be made large in diameter by attaching the brake disc 8 to the rim 7, the amount of heat generated per unit area during braking can be reduced accordingly. It will be advantageous when adopted.

Further, since the brake disc 8 is divided into the divided discs 10, even if the brake disc 8 is heated and deformed during braking,
Unlike the conventional single ring, the whole does not deform into a cone shape, and the concentration of bending stress on the tightening bolt 13 can be reduced.

Further, the existence of the divided gap 15 created by dividing the brake disk 8 allows the surface of the brake pad 21 to be cleaned, and it is necessary to form a groove or hole on the side surface of the brake disk as in the conventional case. Absent.

The divided gap 15 is composed of the end 11 and the end 1.
Since the slanted portions 2 are formed so as to form a leading shape, as shown in FIG.
Sliding contact with the brake pad 21 from the 1a side.

Therefore, even if the end portion 11 is displaced from the surface of rotation due to mounting accuracy or deformation, the tip 11a on the outer peripheral side having such a small deviation comes into sliding contact with the brake pad 21 first, so that the brake pad 21 slides. Is smooth, and abnormal noise and abnormal wear are reduced.

Particularly, since the fastening bolt 13 is attached to the end portion 11 in the vicinity of the outer peripheral end 11a which projects in the rotational direction from the inner peripheral end 11b, such deformation of the end portion 11 can be further reduced. .

Moreover, as shown in FIG. 4, the surfaces of the end portions 11 and 12 are tapered portions 14 which are thinned toward the division gap 15, so that the above effect can be further promoted in this respect as well.

Moreover, since the brake disk 8 is divided into the divided disks 10, the size of the disk can be reduced. Therefore, the heating and polishing costs at the time of manufacturing can be reduced. It can be done and the cost can be further reduced.

5 and 6 show a second embodiment, FIG. 5 is a side view of a wheel to which a disc brake is attached, and FIG. 6 is a sectional view thereof. The same parts as those in the previous embodiment are designated by the same reference numerals.

On this side, the brake disks 8 are attached to the bosses 30 provided on the side surfaces of the spokes 6 with tightening bolts 13, and concentric grooves 31 are formed in the radial middle portion.
Are formed.

The brake disc 8 is composed of three divided discs 10 divided in the same manner as described above. The inner peripheral side of each divided disc 10 is the leading side, and therefore the inner peripheral side is attached by the tightening bolt 13. .

In this example, it is advantageous for the brake disk 8 to be made of steel or the like and not to have an excessively large diameter, and in the case of a smaller diameter, it can be attached to the hub 5.

In this example as well, among the effects of the previous embodiment, the effects other than the effect of attaching to the rim 7 can be similarly enjoyed.

The invention of the present application is not limited to the above-described embodiments, but can be modified in various ways. For example, the division gap 15 does not necessarily have to be formed obliquely, and the tapered portion 1 is not necessary.
It is not necessary to provide 4.

Further, the place of use may be the rear wheel,
You may use it for the wheel of a four-wheeled vehicle and other vehicles.

[Brief description of drawings]

FIG. 1 is a side view of a wheel according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2

FIG. 3 is an enlarged view of a caliper portion in FIG.

4 is an enlarged sectional view taken along line 4-4 of FIG.

FIG. 5 is a side view of a wheel according to the second embodiment.

FIG. 6 is a sectional view taken along line 6-6

[Explanation of symbols]

1: front wheel, 4: wheel, 5: hub, 6: spoke,
7: rim, 8: brake disc, 10: split disc, 11: end portion, 12: end portion, 13: tightening bolt,
14: taper part, 15: division gap

Claims (8)

[Claims] 1. A disc brake in which a brake disc is mounted on the side of a wheel of a vehicle, wherein the brake disc is composed of a plurality of divided discs that are substantially ring-shaped as a whole when they are arranged in the rotational direction, and each of the adjacent divided discs. A disk brake device characterized in that a divided gap is provided by separating adjacent ends of the. 2. The disc brake device according to claim 1, wherein the brake disc is attached to the rim of the wheel. 3. The disk brake device according to claim 1, wherein the brake disk is attached to the hub. 4. The disc brake device according to claim 1, wherein the brake discs are attached to the spokes. 5. The disk brake device according to claim 2, wherein each of the divided disks is a common member. 6. An end portion in the rotation direction of the divided disk is slanted,
6. The disc brake device according to claim 5, wherein the leading side, which is braked by the brake caliper, is fixed to the wheel first. 7. A disk brake device according to claim 5, wherein the wall thickness of the end portion in the rotation direction of the divided disk is tapered so that the tip end side becomes gradually thinner in the rotation direction. 8. The disk brake device according to claim 1, wherein the divided disk is formed of a ceramic reinforced aluminum composite material.