JPS6025657B2 - Vehicle disc brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable caliper type disc brake device for wheels, particularly for two-wheeled vehicles such as motorcycles, which is mounted on a wheel hub.

In the past, various proposals have been made to equip wheel hubs with disc brake devices to prevent deterioration in braking effectiveness due to rainwater or sewage adhering to the braking friction surface of the brake disc. Also, when a brake caliper is configured to be movable, pinching a pair of friction pads on both sides of a brake disc, the brake caliper is slidably supported only on an axle that protrudes to one side of the hub. Since the distance between the sliding supports of the caliper with respect to the axle did not overlap with the distance between the rotating branches of the hub with respect to the axle, in order to make the distance between the sliding supports of the caliper with a sufficiently long , it is necessary to narrow the distance between the rotational supports of the hub or increase the effective span of the axle.

However, the distance between the rotational supports of the hap depends on wheel rigidity, bearing life,
This is an important factor that affects the strength of the axle, and requires a certain length or more.On the other hand, the effective span of the axle should be kept as short as possible in order to downsize the surrounding structure of the wheel and obtain high wheel rigidity. In reality, it is difficult to maintain a sufficiently long distance between the brake caliper's driving fulcrums, and this can cause the brake caliper to twist during braking, causing uneven wear of the friction pads and poor braking. There is a risk of An object of the present invention is to provide the above-mentioned disc brake device that solves this problem, and is characterized in that the hub of the wheel is connected to an inner cylinder supported by the axle and an outer cylinder connected to the spokes. The outer cylindrical part is configured by integrally connecting one side end of the outer cylindrical part to the other end of the outer cylindrical part through a side wall part, the outer periphery of a brake disc is fixed to the other end of the outer cylindrical part, and the brake disc is straddled from the inner periphery of the outer cylindrical part. A brake caliper that pinches a pair of friction pads on both the inner and outer surfaces of the brake disc is connected to the inner cylindrical portion and at least two brake calipers on the axle that protrude from the inner cylindrical portion.
The brake caliper is slidably supported to allow rotation of the hub at a point, and the brake caliper is engaged with the vehicle body so as to be relatively movable in the axle direction but not relative to the axle.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The illustrated example is applied to a front wheel brake system of a motorcycle, and the hub of the front wheel W is supported at both ends by a pair of left and right fork legs F and F' of a front fork. A pair of bearings 3, 3' spaced apart from each other in the axial direction at the center of the axle 2
Between the two fork breasts F and F', there are left, center and right spacing cylinders 4, 5 and 6 mounted on the axle 2 to hold the two forks 3 and 3' in the stereotaxic layer. It will be installed and installed.

The hub has an inner cylinder part la into which the bearings 3 and 3' are inserted, and an outer cylinder part 11b which connects the spokes 7.
The outer cylindrical part lb has a hollow shape with an open left side, and the outer periphery of the annular brake disc 8 is attached to the left end of the outer cylindrical part lb through several bolts. It is fixed by 9.

Reference numeral 10 indicates a brake cap IJ pad, which includes inner and outer arm portions 10a and 10 connected together by bolts 11.
b, which are arranged so as to straddle the brake disc 8 from its inner circumferential side, so that the inner arm portion 10
a is accommodated in the hollow part of the hub 1.

The inner arm part 10a has an inner bearing part 13 rotatably and slidably supported on the inner cylinder part la of the hub via a needle bearing 12, and the outer arm part 10b has an inner bearing part 13 rotatably supported on the left spacer cylinder 4. and a slidably supported outer bearing part 14 are each formed in one piece, so that the brake caliper can be displaced parallel to the axle 2 and the hub can be rotated independently of the brake caliper 10. Further, the outer arm portion 10b is integrally formed with a disc-shaped cover 15 that covers substantially the entire outer surface of the brake disc 8, so that the brake disc 8 has both inner and outer surfaces attached to the hub 1.
and cover 15, and can avoid adhesion of rainwater, sewage, etc. In order to prevent the brake caliper 10 from rotating around the axle 2, a protrusion 16 raised on the outer surface of the cover 15 is located between two protrusions 17 and 17' provided on the inner surface of the left fork leg F. , and their engagement surfaces are slidable to allow axial displacement of the brake caliper 10.

Further, in the brake caliper, a friction pad 18 facing the inner surface of the brake disc 8 is fixed to the inner arm portion 10a, while a friction pad 19 facing the outer surface of the brake disc 8 is fixed to the outer arm portion 10b. A hydraulic cylinder 21 is provided which is mounted so as to be able to slide in the axial direction and which houses a piston 20 for pressing the rear surface of the hydraulic cylinder 21.
A hydraulic conduit 22 connected to a brake master cylinder (not shown) is connected to one side of the hydraulic cylinder 21.

Note that 23 and 24 in the figure are seal members provided at the outer ends of both bearing parts 13 and 14 of the brake gear IJ pad 10, respectively, to retain lubricating oil on the drinking surfaces of each bearing part 13 and 14. .

Next, the operation of this embodiment will be explained. When a brake master cylinder (not shown) is operated to fill the hydraulic cylinder 21 with pressure oil, the piston 20 moves forward due to the hydraulic pressure, and the friction pad 19 is moved against the outer surface of the brake disc 8. Pressed against the
Due to the reaction, the inner arm 10 of the brake caliper 10
a presses the friction pad 18 against the inner surface of the brake disc 8, and as a result, the brake disc 8 is braked by equally receiving frictional force on both its inner and outer surfaces, and the braking torque is applied to the friction pads 18, 19 and the flake carrier IJ pad. 10, and is transmitted to the protrusion 16, 17 or 17' and supported on the fork leg F.

If the friction pads 18 and 19 wear out due to sliding contact with the brake disc 8, the piston 20 moves forward and the brake caliper 10 is displaced in all directions of the axis opposite to the movement of the piston 20 (leftward in FIG. 2). displacement) and their wear is compensated for.

What is particularly noteworthy in this case is that the sliding fulcrums of the brake caliper 10 are the inner cylindrical part la of the hub and two points on the axle 2 that protrude from the inner cylindrical part la, that is, the two points on the axle 2 that protrude from the inner cylindrical part la, that is, the sliding fulcrums of the brake caliper 10 are at the bearing parts 13 and 14. Since the distance L between the supporting points is long, the brake caliper 10 can perform the axial displacement extremely smoothly without twisting, and can always perform a good braking action. Further, the distance L between the supporting points is determined from the above configuration by Huff 1
The distance between the left and right rotational supports, that is, the distance L2 between the bearings 3 and 3'
This means that the distance L between the sliding supports of the flake caliper 10 can be increased without narrowing the distance L2 between the rotation supports of the hub or increasing the effective span L3 of the axle 2. This has the important meaning of being able to be set for a sufficiently long time.

This is because the distance L2 between the rotational supports of the hub is determined by the wheel rigidity,
It is an important factor that affects bearing life, axle strength, etc., and requires a certain length or more.On the other hand, the effective span L3 of the axle 2 obtains the shape of the surrounding structure of the wheel W and the wheel rigidity. This is because it is necessary to make it as short as possible. As described above, according to the present invention, the hub of the wheel is constructed by integrally connecting one side end of the inner cylinder part supported by the axle and the outer cylinder part connected to the spokes via the side wall part, The outer periphery of a brake disc is fixed to the other end of the outer cylindrical part, and a brake caliper that straddles the brake disc from the inner periphery side and presses a pair of friction pads on both the inner and outer sides of the brake disc is attached to the inner cylinder. and at least two points on the axle protruding from the inner cylindrical portion so as to be slidably supported to allow rotation of the hub, and the brake caliper is movable relative to the vehicle body in the axle direction and around the axle. Since the movable brake caliper was engaged with the brake caliper so that it could not rotate relative to the brake caliper, the movable brake caliper was supported at at least two points on the inner cylindrical part of the hub and on the axle that protruded from the inner cylindrical part. Moreover, by adopting such a support form, the distance between the brake caliper's floating supports and the distance between the rotation supports of the hub can be overlapped for a long time in the axle direction, and the distance between the brake caliper's rotating supports can be increased. can be set sufficiently long without affecting the effective span of the axle or the distance between the rotational supports of the hub, and as a result, the displacement of the brake caliper in the vertical direction during braking is performed smoothly, resulting in always good braking action. This makes it possible to prevent uneven wear of the friction pads, maintain wheel rigidity, ensure steering stability, and downsize the structure around the axle.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the device of the present invention, and FIG. 2 is a longitudinal sectional view thereof. W...Front wheel as a wheel, F...Fork leg as a vehicle body, 1...Hub, la...
...Inner cylinder part, lb...Outer cylinder part, lc...
... Side wall part, 2 ... Axle, 8 ... Brake disk, 15 ... Cover. Figure 1 Younger brother Figure 2

Claims (1)

[Scope of Claims] 1. The hub of a wheel is constructed by integrally connecting one side end of an inner cylinder part supported by the axle and an outer cylinder part connected to the spokes via a side wall part, and the outer cylinder part The outer periphery of the brake disc is fixed to the other end of the inner cylindrical part, and a brake caliper that straddles the brake disc from the inner periphery and presses a pair of friction pads on both the inner and outer sides of the brake disc is connected to the inner cylindrical part. , the hub is slidably supported at at least two points on the axle protruding from the inner cylinder portion to allow rotation of the hub, and the brake caliper is movable relative to the vehicle body in the axle direction and around the axle. A vehicle disc brake device that is engaged in a manner that prevents relative rotation. 2. A vehicle disc brake device according to claim 1, wherein the brake caliper includes a disc-shaped cover that covers substantially the entire outer surface of the brake disc.