JP3031627B2 - Disc brake device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disc brake device used for a motorcycle.

(Prior Art) A disc brake device used for braking a motorcycle presses a pad against a brake disc by moving a piston slidably fitted in a caliper by hydraulic pressure or the like, and presses the pad against the brake. The wheel that rotates together with the brake disk is braked by frictional resistance generated between the disks.

(Problems to be solved by the invention) However, in such a disc brake device,
In a certain frequency range, the spokes of the wheel, the hub, and the brake disk resonate, generating an unpleasant noise called so-called brake squeal.

Therefore, there has been proposed a structure in which the hub and the brake disc are supported so as to be rotatable relative to each other, and a vibration-proof rubber is partially interposed between the two. However, according to this, the number of parts increases and the structure becomes complicated. This causes a problem that assembly is troublesome.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a motorcycle disk brake device that can solve the problem of brake squeal.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a front fork having a wheel formed by radially extending a plurality of wire spokes between right and left hubs having different diameters and a rim. The brake disc is rotatably supported at the lower end portion, and includes a brake disc connected to a hub of the wheel, and a caliper having a pad inside. The pad is pressed against an outer peripheral braking surface portion of the brake disc. In the disc brake device that applies braking to the wheel by this, the caliper is attached to a bracket integrally projecting from the rear side of the lower part of the front fork, and the lower front part of the front fork covers substantially half of the outer circumference of the brake disc. Attach a disk cover with a U-shaped cross section, and attach the inner peripheral mounting portion of the brake disk to the outside of the large-diameter hub of the wheel. A rubber ring is fitted on the outer peripheral surface of the large-diameter side hub, and a plurality of grooves having a semicircular cross section are radially provided on the inner surface of the rubber ring. The spokes are fitted between the spokes of the wheel and the inner surface of the inner mounting portion of the brake disk by elastic deformation of the rubber ring in the vehicle width direction. .

(Operation) According to the present invention, the vibration of the spokes, the hub, and the brake disc is effectively attenuated by the rubber ring, and the resonance is suppressed over a wide frequency range, so that the occurrence of brake squeal is effectively prevented. . Since the vibration of the brake disk is suppressed, the width of the disk cover partially covering the brake disk can be reduced, and the dead space between the front fork and the wheel can be reduced.

Further, according to the present invention, since the rubber ring is fitted to the outer peripheral surface of the large diameter side hub, the positioning of the rubber ring at the time of assembly is facilitated.

Further, according to the present invention, the inner peripheral side mounting portion of the brake disk is fixed to the outer surface of the large diameter side hub of the wheel with bolts, and a rubber ring is fitted to the outer peripheral surface of the large diameter side hub,
Since the rubber ring is contracted between the inner surface of the inner mounting portion of the brake disc and the spoke of the wheel, the positions of the bolt and the rubber ring are close to each other, and the base end of the spoke (a portion fixed to the hub). The rubber ring is compressed at a position close to, and the bending of the spoke due to the elastic reaction force of the rubber ring can be suppressed to a small value.

Further, according to the present invention, a plurality of grooves having a semicircular cross section are radially formed in the inner surface of the rubber ring and the respective spokes of the wheel are fitted in the respective grooves. The gap between the spokes is prevented and the circumferential spacing between the spokes is kept constant.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a front wheel portion of a motorcycle showing a disc brake device according to the present invention, FIG.
FIG. 3 is a front sectional view of a rubber ring portion of the disc brake device according to the present invention, and FIG. 4 is a sectional view taken along line IV-IV of FIG.

1 and 2, reference numeral 1 denotes a front fork, at the lower end of which a front wheel 2 is rotatably supported by an axle 3. The front wheels 2 are large and small diameter hubs 4,5
, And a plurality of wire-like spokes 7 are radially stretched between the hubs 4 and 5 and the rim 6.

Meanwhile, a ring-shaped brake disc 8 is fixed to the outer surface of the hub 5 on the large-diameter side by fastening an inner peripheral mounting portion thereof with a plurality of bolts 9.
A rubber ring 10 is fitted on the outer peripheral surface of the hub 5 on the large diameter side. As shown in FIGS. 3 and 4, a plurality of grooves 10a having a semicircular cross section are formed in the inner surface of the rubber ring 10 in the radial direction. In a state in which the spokes 7 are fitted, the rubber ring 10 is elastically deformed (compressed) in the vehicle width direction of the rubber ring 10 to connect the inner surface of the inner peripheral side mounting portion of the brake disk 8 to the spokes 7. It is contracted in between.

A part (approximately half a circumference) of the braking surface portion on the outer peripheral side of the brake disk 8 is covered by a disk cover 11 having a U-shaped cross section attached to the lower front side of the front fork 1, as shown in FIG. In addition, a caliper 12 is attached to brackets 1a and 1b integrally projecting from the lower rear side of the front fork 1.

Thus, while the motorcycle is running, the caliper 12 is moved by a brake operation of gripping a brake lever (not shown).
When a piston (not shown) fitted inside is moved by hydraulic pressure, a pad (not shown) that moves together with the piston is pressed against the brake surface portion on the outer peripheral side of the brake disk 8, so that the pad and the brake disk 8 The front wheel 2 that rotates together with the brake disc 8 due to the generated frictional resistance
Is braked.

At this time, vibrations generated in the spokes 7, the hub 5 and the brake disk 8 are effectively attenuated by the rubber ring 10 as a vibration absorbing material, and these resonances are suppressed over a wide frequency range. Is effectively prevented. Since the vibration of the brake disk 8 is suppressed, the width of the disk cover 11 that partially covers the brake disk 8 can be reduced, and the dead space between the front fork 1 and the front wheel 2 can be reduced.

According to this embodiment, the rubber ring 10 is connected to the large-diameter hub 5.
Since the rubber ring 10 is fitted to the outer peripheral surface, positioning at the time of assembling the rubber ring 10 is facilitated.

Further, in this embodiment, the inner peripheral side mounting portion of the brake disk 8 is fixed to the outer surface of the large diameter side hub 5 of the front wheel 2 with bolts 9.
10 and the rubber ring 10 is compressed between the inner surface of the inner peripheral side mounting portion of the brake disc 8 and the spokes 7 of the front wheel 2, so that the positions of the bolts 9 and the rubber ring 10 are close to each other. Then, the rubber ring 10 is contracted at a position near the base end portion (fixed portion to the hub 5) of the spokes 7, so that the bending of the spokes 7 due to the elastic reaction force of the rubber ring 10 can be suppressed. .

Further, in the present embodiment, a plurality of grooves 10a having a semicircular cross section are formed in the inner surface of the rubber ring 10 in the radial direction, and each spoke 7 of the front wheel 2 is fitted into each groove 10a. The circumferential displacement of the spokes 10 itself is prevented, and the circumferential spacing between the spokes 7 is kept constant.

(Effects of the Invention) As is apparent from the above description, according to the present invention, a wheel formed by radially extending a plurality of wire-like spokes between left and right hubs and rims having large and small diameters is used as a front fork. The brake disc is rotatably supported at the lower end portion, and includes a brake disc connected to a hub of the wheel, and a caliper having a pad inside. The pad is pressed against an outer peripheral braking surface portion of the brake disc. In the disc brake device that applies braking to the wheel by this, the caliper is attached to a bracket integrally projecting from the rear side of the lower part of the front fork, and the lower front part of the front fork covers substantially half of the outer circumference of the brake disc. Attach a disk cover with a U-shaped cross section, and attach the inner peripheral mounting portion of the brake disk to the outer surface of the large-diameter hub of the wheel. While fixing with a bolt, a rubber ring is fitted on the outer peripheral surface of the large-diameter side hub, and a plurality of grooves having a semicircular cross section are penetrated in the radial direction on the inner surface of the rubber ring. The spokes were fitted and the rubber ring was compressed between the inner surface of the inner mounting portion of the brake disc and the spokes of the wheel by its own elastic deformation in the vehicle width direction, eliminating the problem of brake squeal. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a front wheel portion of a motorcycle showing a disc brake device according to the present invention, FIG. 2 is a cutaway front view thereof, and FIG. 3 is a front sectional view of a rubber ring portion of the disc brake device according to the present invention. FIG. 4 is a sectional view taken along line IV-IV of FIG. 1 ... front fork, 1a, 1b ... bracket, 2 ...
... front wheel (wheel), 4,5 ... hub, 6 ... rim, 7 ...
... spokes, 8 ... brake discs, 9 ... bolts,
10… Rubber ring, 10a… Groove, 11… Disc cover, 12… Caliper.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-61-166702 (JP, A) JP-A-63-23031 (JP, A) JP-A-52-132277 (JP, A) JP-A-58-58 72734 (JP, A) JP-A-57-1835 (JP, A) JP-A 63-69087 (JP, U) JP-A 50-88789 (JP, U) JP-A 54-159654 (JP, U) Japanese Utility Model Showa 62-163401 (JP, U) Japanese Utility Model Showa 52-164686 (JP, U) Japanese Utility Model Hei 2-82685 (JP, U) Japanese Utility Model Showa 50-114590 (JP, U) Japanese Utility Model Showa 53-3390 (JP, U) JitsuHiraku Akira 59-167085 (JP, U) JitsuHiraku Akira 62-43901 (JP, U) JitsuHiraku Akira 54-28853 (JP, U) (58 ) investigated the field (Int.Cl. ⁷ , DB name) F16D 65/12 B62L 1/00

Claims (1)

(57) [Claims] A wheel formed by radially extending a plurality of wire-like spokes between right and left hubs having different diameters and a rim is rotatably supported on a lower end portion of a front fork, and is connected to the hub of the wheel. A disc brake device comprising: a mounted brake disc; and a caliper having a pad inside. The disc brake device applies a brake to a wheel by pressing the pad against an outer braking surface portion of the brake disc. The caliper is attached to a bracket integrally projecting from the rear of the lower part, and a disk cover having a U-shaped cross section that covers substantially a half of the outer periphery of the brake disk is attached to the front lower part of the front fork. The peripheral mounting portion is fixed to the outer surface of the large-diameter hub of the wheel with bolts, and the outer peripheral surface of the large-diameter hub is fixed to the outer peripheral surface of the large-diameter hub. A rubber ring is fitted, a plurality of grooves having a semicircular cross section are radially formed in the inner surface of the rubber ring, and the spokes of the wheel are fitted into the grooves, and the rubber ring has its own vehicle width. A disc brake device for a motorcycle, wherein the disc brake device is contracted between an inner surface of an inner peripheral side mounting portion of the brake disc and a spoke of the wheel by elastic deformation in a direction.