JPH09151966A - Disc brake, in which caliper reaction for motorcycle front wheel preferably having peripheral-section annular disc is passed through wheel fixing support axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a caliper be elastically pulled in an initial braking period and give softer braking movement by fixing the caliper of a disc brake in an arm fixed in a center axle which is coaxial with a wheel and whose end part is key-fixed in a fork end. SOLUTION: In a disc brake for a front wheel of a motor cycle, a caliper 9 which fixes a brake disc 2 in the inner face of a wheel rim 3 and sandwiches the brake disc to carry out braking is so installed as to be elastically pulled back. That is, a supporting arm 9 for a caliper 8 is positioned in a spring lower part 5 of a fork 6 through spacers D1, D2 in an axle and a hole is formed in the axle, in which a hydraulic passage B to operate the caliper 8 is communicated, in the axle line direction. As a result, a braking track with an extremely wide surface area is provided and the reaction heat can be lessened and at the same time lifting of a rear side of a motor cycle due to abrupt braking of the front wheel can be moderated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral annular disc brake, preferably for the front wheels of a motorcycle, arranged so that the caliper reaction force passes through a wheel fixed support axle.

[0002]

2. Description of the Related Art Modern motorcycles have considerable power and therefore require similarly powerful brakes. The brakes currently in use are of the "disc" type, consisting of one or more discs fixed parallel to the wheels, each disc being fitted with a suitable "pad" having a high coefficient of friction with a separate caliper. The brake is applied by sliding it.

This type of brake uses a disc fixed to the wheel hub and having a small width in the centrifugal direction, so that the two sliding surfaces of the pads provided are relatively small.
Therefore, the heat generated on the sliding surface cannot be sufficiently dissipated.

[0004]

When the disc is located to the side of the wheel and the caliper is fixed to one of the two legs of the wheel steering fork, the front wheel of the motorcycle is braked. And an eccentric force is applied from the steering axis, resulting in a steering moment that is dangerous for the posture of the motorcycle. In a general braking device, since the caliper is firmly fixed to the frame, braking of the wheel is instantaneous and it is difficult to control the wheel gradually. In the brakes on the front wheels of a motorcycle, the caliper is mounted approximately in the middle of the fork, which obviously depends on the diameter of the brake disc. That is, the larger the diameter,
The caliper will be located far from the point where the axle passes. Therefore, even if the response characteristic becomes elastic due to the bending of the fork by mounting the brake caliper on the fork, the response becomes progressively rigid as the caliper is farther from the axle. Therefore, in the case of a motorcycle with high power performance, if other technical factors are the same, that is, if the attachment position of the caliper to the fork increases as the diameter of the disk increases, the brake The use of discs leads to poor braking performance. Furthermore, such a rigid response characteristic also promotes lifting of the rear wheels (during braking), which results in a reduction in ground contact and a reduction in the overall braking ability of the motorcycle. . Further, when a single caliper is used as in the conventional configuration, the wheel may turn laterally during braking and the balance of the vehicle body may be lost.

Accordingly, it is an object of the present invention to provide a disc brake having a very large area braking track to reduce operating heat and improve durability. A further object of the present invention is to reduce lifting of the rear part of the motorcycle due to sudden braking of the front wheels. The present invention further provides a brake having the above-mentioned characteristics, wherein the caliper is elastically dragged in the initial stage of braking in order to avoid wheel lock and impact on the fork, resulting in a softer braking operation. The purpose is to provide a brake that enables

[0006]

DISCLOSURE OF THE INVENTION A disc brake, preferably for a front wheel of a motorcycle, comprising an annular disc, wherein the generated caliper reaction force passes through a fixed axle coaxial with the axle. , A caliper is attached to the end of a radial arm fixed to a fixed axle, the fixed axle being torsionally keyed to a non-rotating seat at the fork end that functions as a wheel support. From the following detailed description, it will be appreciated that the above-mentioned and other objects are achieved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described by using embodiments with reference to the accompanying drawings. However, the present invention is not limited to this.

It can be seen from FIG. 1 what kind of stress is applied to the fork of a general motorcycle by the braking force. In the figure, reference numeral 1 is a normal tire, 2 is a brake disc fixed to a wheel rim 3 by a normal means, 4 is a normal bush for fixing the wheel rim to the brake disc, and 5 is a bush. Fork 6
7 shows the unsprung part, 7 is a spoke connecting the wheel hub to the wheel rim 3, and 8 is a brake caliper supported by a radial arm 9.

Assuming that the wheel rotates in the S direction, when the disc 2 is sandwiched by the caliper 8, the caliper is hung and tries to rotate. However, in reality, the caliper 8 does not rotate, because the caliper 8 is attached to the fixed part of the motorcycle. In the prior art, it is customary to attach the caliper 8 to the unsprung portion 5 of the fork, for example, at the point P, and the braking force generated for this causes a reaction force R. This braking reaction force must be balanced between the road friction force T and the weight force Z due to the moment around the front wheel contact point due to the combined weight of the motorcycle and the driver.

In this way, the braking force R bends the fork 6 and pulls back the caliper 8, and as a result, the braking is gradually performed to some extent. The position of the point P is directly related to the diameter of the annular disc 2 on which the caliper operates: P if the diameter of the braking track is small.
The point is closer to the center of the wheel. This will actually cause the track length to be shortened, resulting in high operating heat and inoperability.
Theoretically, braking will be more gradual due to the greater flexure of the.

The present invention finds a compromise between the above two optimum conditions. That is, in the present invention, a considerably long disc track can be used, and
The elastic pullback of the caliper 8 is maximized. This does not fix the caliper directly to the fork (ie point P), but to the arm 9 which is coaxial to the wheel and which is fixed to the central axle 14 whose end is keyed to the fork end 5. Achieved by This causes the caliper to no longer act at point P on the fork, but instead causes the "torque force" centered at 14 to combine with the force Z due to weight to cause the fork to flex to its maximum. It works at various positions. However, this fork deflection is not a requirement for the purposes of the present invention and is merely one of the possible consequences, to the extent that it is even better. Here, one of the requirements of the present invention is to configure the caliper so as to be elastically pulled back, and this requirement is achieved even when a fork that theoretically does not deform under the flexural stress described above is used. It can be done. In practice, the elastic return of this caliper can be relied entirely on the fact that the central axle 14 is inherently torsionally elastically deformable. As can be seen in FIG. 3, the axle 14 is fixed to the central arm 9 by conventional means 13, the ends of which are keyed to the unsprung part 5 of the fork. This keying is accomplished by a spline 11 of the type shown in FIG. FIG. 2 is an example of a detailed configuration including an end portion 5A which is dovetailed and fixed with a bolt 12.

The axle 14 is a support arm 9 for the caliper 8.
Between the unsprung part 5 of the fork 6 and the normal spacer D1,
It is for supporting the bearing 15 for the spoke type wheel 7 arranged via D2. The assembly is tightened with nuts 16. In order to connect the normal hydraulic passage B for operating the caliper 8, the axle 14 is bored in the axial direction.

FIG. 4 shows an embodiment of the invention using two normal brake discs. This figure 4
Among the constituent elements, those having the same functions as those shown in FIG. 3 are indicated by adding 100 to the reference numerals in FIG. Therefore, 107 is a spoke wheel, 115 is a bearing, 102 is a brake disc, and 109 is a caliper 10.
8 shows the support arm, 103 the wheel rim, 105 the unsprung part of the fork 106, and 116 the nuts that fasten these components mounted on the axle 114 together.

B1 schematically shows a hydraulic passage for operating the caliper 108. In this embodiment, a keyway is provided at the ends 114A and 114B of the axle 114 so that the arm 109 and the unsprung portion 105 of the fork 106 are keyed to the endway keyway. In this case, all the elasticity of the brake is left to the fork 106.

The general wheel shown in FIG. 5 can be used as the front wheel of a single-arm front suspension type motorcycle, as the rear wheel of a rear wheel drive motorcycle, or as the drive wheel or idler of an automobile. It can also be used as a wheel. Among the components in this figure, the parts common to those shown in the previous embodiment are
Shown by adding 200 to the previous code. Caliper 208 has axle 21
Supported by an arm 209 fixed to 4, the axle 214 has a keyed end 214A keyed inside the tubular cross member 205A of the swing support 205. The rocking support 205 is clearly horizontal and spring-loaded to form a suspension. Wheel 207
It can also be correlated with chain drive sprockets 10A or live axle heads 10a.

[0016]

As described above, the caliper takes out the reaction force from the center position of the shaft, so that the caliper can be actually arranged at any angle within 360 revolutions. That is clear. That is, 2,
It is clear that a plurality of calipers provided on the upper end of the support arm (s) 3, 4, ... Can be arranged in the circumferential direction of the brake disc. Further, with this configuration, the pressure required for braking is considerably reduced, while the braking area is increased, which has the advantage of improving braking performance. The invention has the further advantage that it is possible to use annular brake discs fixed directly to the wheel rim. Further, in the present invention, the caliper can be arranged at any angle without being restricted by the mounting angle of the fork of the motorcycle. Moreover, there is the advantage that the possibility of the wheel locking can be reduced by applying the braking in a very simple and reliable manner. The invention has the further advantage that it is possible to prevent sudden moments in the horizontal direction of the fork due to the use of a single disc or the fact that multiple discs are not braked simultaneously.

[Brief description of the drawings]

FIG. 1 shows a front wheel of a motorcycle in which a caliper is engaged with an annular disc brake fixed on a radially inner side of a tire support rim.

FIG. 2 is a schematic cross-section of the lower end of a fork.

FIG. 3 is a schematic cross-sectional view of the upper front wheel with one annular disc brake mounted radially inward of the tire support rim.

FIG. 4 is a schematic cross-sectional view of the upper front wheel with two annular disc brakes mounted on opposite sides of the wheel hub.

FIG. 5 is a cross-sectional view of a typical wheel with a protruding brake caliper mounted on a horizontal arm and interacting with a torsion bar.

Claims (6)

[Claims] 1. Preferably for a motorcycle front wheel,
A disc brake having an annular disc, wherein the reaction force of the caliper (8,108,208) passes through a fixed axle (14,114,214) coaxial with the wheel axis, and the caliper is fixed to the radial arm (14,114,214). (9,1
09,209) and the axle is torsionally keyed to at least one non-rotating seat on each end of the wheel support (5, 105, 205). 2. Disc according to claim 1, characterized in that the disc is annular (2, 202) and is mounted directly on the central part of the rim (3, 203) of the wheel (7, 207). ·brake. 3. A support means (5, 5) in which an axle fixed to a caliper support arm is formed by a suspension.
105, 205) end with keyway for keying
Disc brake according to claim 1 or 2, characterized in that it has (14, 114A, 214A). 4. The disc brake according to claim 1, wherein the axle functions as an elastic torsion rod by receiving a reaction force against the thrust of the caliper (8, 108, 208). . 5. Support arms (9, 109, 209) for the calipers (8, 108, 208) are separable from the keyed axles (14, 114, 214) and fixed to said axles by known means. Disc brake according to any of claims 1 to 4, characterized in that 6. The disk according to claim 1, wherein there are two or more calipers per disk supported and operated by an arm centered on the axis of the wheel to be braked. brake.