JPS6216398Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc brake device for a motorcycle in which a brake disc is attached to the side surface of a wheel hub.

BACKGROUND ART In a conventional disc brake device for a motorcycle, a structure as shown in FIG. 1 is known in which a brake disc is integrally attached concentrically to one or both sides of a wheel hub.

That is, there is a brake disc b on the side of the wheel hub a.
The outer peripheries of the discs were overlapped and integrally connected to each other by bolts or other coupling means e passing through attachment holes d formed in the outer periphery c of the disks.

Problems to be solved by the invention However, in such a structure, the mounting hole d
Since there is no play between the outer peripheral surface of the coupling means e,
When the disk b is heated by the frictional heat generated during braking, and thermal expansion occurs in the disk b in the radial direction, a force that tends to deform the hub a in the radial direction in response to this is applied to the hub. In addition to the thermal stress caused by the non-uniform temperature distribution, stress due to the restraining force acting as the deformation resistance of the hub a tends to occur in the disk b.

In addition, in order to avoid this stress, if a play is provided between the mounting hole d and the outer peripheral surface of the coupling means e, when the braking torque acting on the disc b changes over time, this torque fluctuation cannot be absorbed sufficiently.

Furthermore, since the braking torque acting on the brake disc is transmitted to the hub via the bolt, the bolt may loosen if there is such play.

Means and Effects for Solving the Problems The present invention relates to an improvement of a disc brake device for motorcycles that overcomes the above-mentioned difficulties, and involves integrally forming a plurality of mounting bosses on the side surface of a wheel hub in the circumferential direction. In a disc brake device for a motorcycle, an engaging part corresponding to the mounting boss is formed on the outer peripheral part of the brake disc, and the engaging part of the brake disc is fitted and fixed to the mounting boss of the wheel hub, A hard elastic retainer interposed between the disk and the hub is arranged between a U-shaped peripheral portion that abuts surfaces located at both ends of the mounting boss in the circumferential direction and an inner surface near the center thereof, and a circumferential portion of the U-shaped peripheral portion. and a clamping part extending integrally from one side edge of both ends, and the angles formed by the clamping parts and both circumferential ends of the U-shaped peripheral part are located at both circumferential ends of the mounting boss. The clamping portion is bent so as to form an angle smaller than the angle between the curved surface and the side surface of the wheel hub, and the U-shaped peripheral portion of the hard elastic retainer is interposed between the mounting boss and the brake disc. At the same time, the clamping portion of the hard elastic retainer is interposed between the wheel hub and the disc, and the disc is clamped between the cover member attached to the wheel hub and the wheel hub, thereby improving the elasticity of the hard elastic retainer. A restoring force can be exerted between the sides of the wheel hub and the brake disc.

Embodiment An embodiment of the present invention shown in FIGS. 2 to 6 will be described below. 1 is a rear wheel axle whose both ends are fixed to a rear fork assembly 2, and a bearing 3 is attached to the rear wheel axle 1. A rear wheel hub 4 is rotatably supported through the rear wheel hub 4, and a rear tire (not shown) is mounted on the outer periphery of the rear wheel hub 4.

Further, a final driven flange 7 is attached to the left side of the rear wheel hub 4, and a driven sprocket 8 is detachably attached to the final driven flange 7 with bolts 9.

Further, three mounting bosses 5 are integrally formed on the right side of the rear wheel hub 4 at equal intervals in the circumferential direction, and are attached to the outer periphery of the brake disc 10 so that both sides of the mounting bosses 5 in the circumferential direction can be sandwiched. Projection part 1
1 is provided in a protruding manner to form an engaging portion, and the protruding portion 11 of the brake disc 10 can be freely fitted into and removed from the mounting boss 5 of the rear wheel hub 4 with a gap provided by movement of the disc 10 in the axial direction. It is designed to be mated to.

Furthermore, the brake disc 10 is formed with a plurality of radially extending ribs 13 for fixing the cooling air passages 12.

Thus, a gap is formed between the outer circumferential surface sandwiched between the protrusions at both ends of the brake disk 10 and the inner circumferential surface of the mounting boss 5 to absorb thermal expansion of the disk 10.

Also, the mounting boss 5 of the rear wheel hub 4
A retainer 14 having high hardness is disposed so as to be loosely fitted into the gap between the protruding portion 11 of the brake disc 10 and the portion therebetween. Clipping part 1 integrally extended from one side edge of opposing ends 15a
6, and the holding portion 16 is bent at an acute angle of less than 90° with respect to both ends 15a.

Furthermore, a cylindrical portion 6 is formed on the rear wheel hub 4 excluding the mounting boss 5 so as to have a predetermined gap with the outer circumferential surface of the brake disc 10. A side panel 17 is formed to seal the inner surface and the brake disc 10, and the side panel 1
7 is a gap 21 whose outer peripheral portion 19 has a predetermined gap value δ with the edge of the cylindrical portion 6 of the rear wheel hub 4.
It is supported and fixed to the rear fork assembly 2 so that it has.

Further, a cover member 25 is disposed to cover the mounting boss 5 of the rear wheel hub 4 and the protrusion 11 of the brake disc 10.
0 is fitted to the wheel hub 4, the cover member 25 is detachably attached to the attachment boss 5 of the rear wheel hub 4 with bolts 20.

Furthermore, a caliper member 22 having integral pads 23 is disposed at a location diagonally above the rear wheel axle 1 so as to face both ends of the brake disc 10 so as to be able to freely approach and separate from the caliper member 22. The pair of pads 23 are integrally attached to the panel 17, and are pressed against both sides of the brake disc 10 by the operation of the caliper piston 24, so that the brake can be applied.

Since the embodiment shown in FIGS. 2 to 6 is constructed as described above, after fitting the retainer 14 to the mounting boss 5 of the rear wheel hub 4 as shown in FIG. brake disc 1
0, and then cover member 2.
5 and then screwing together the bolts 20 allows the brake disc 10 to be attached to the rear wheel hub 4.

Further, when the caliper piston 24 of the caliper member 22 is operated, the pair of pads 23 are pressed against both sides of the brake disc 10, and the rear wheel hub 4 is braked.

Furthermore, the brake disc 10 has a rear wheel hub 4 located away from the center of rotation with its outer peripheral protrusion 11.
Since the brake disc 10 is engaged with the mounting boss through the retainer 14, the braking force acting on the brake disc 10 is reliably transmitted to the rear wheel hub 4.

Furthermore, the protrusion 11 of the brake disc 10
The surface of the brake disc 10 is pressed against the side panel 17 by the elastic restoring force of the clamping part 16 of the retainer 14, and the brake disc 10 is stably fixed to the cover member 25, so that the disc 10 does not wobble due to vibrations of the vehicle body or the like.

Further, even if an impact force is applied to the disk 10, the hard retainer 14 prevents the inner surface of the protrusion 11 of the disk 10 and the side surface of the attachment boss 5 of the rear wheel hub 4 from being worn out.

Further, since the brake torque is borne by the mounting boss 5 and does not act on the bolt 20, the bolt 20 can be firmly screwed into the mounting boss 5 for a long period of time.

Furthermore, since the brake disc 10 is covered with the rear wheel hub 4 and the side panel 17, water and dirt are prevented from adhering to the surface of the brake disc 10, and the disc 10 and pads 23 are prevented from adhering to foreign matter such as dirt. Less wear.

Furthermore, a gap 21 is formed on the outer periphery of the disk 10, and the disk 10 also has a cooling air passage 12.
As the rear wheel hub 4 rotates, the cooling air passage 12 also rotates, and the air within the passage 12 is drawn away from the outer periphery of the disk 10 by centrifugal force. Gap 2
1 to the outside air, and the frictional heat generated in the brake disc 10 during braking is dissipated by the air, resulting in good cooling performance.

In the embodiments shown in FIGS. 2 to 6, the present invention is applied to a rear wheel, but the present invention can of course also be applied to a front wheel provided with a brake disc on one or both sides.

Further, in the above embodiments, the present invention was applied to an internal type disc brake device provided with a side panel, but it is of course applicable to a disc brake device other than an inner type.

Effects of the invention In the present invention, as described above, the elastic restoring force of the hard elastic retainer can be applied between the side surfaces of the wheel hub and the brake disc to generate a large frictional force between both sides. It is possible to buffer the impact force and vibration force in the direction of the hub rotation axis that acts between the brake disk and the wheel hub, and even if the braking torque acting on the brake disk fluctuates over time, the frictional force This torque fluctuation can be sufficiently absorbed.

Further, in the present invention, since the elastic retainer interposed in the wheel hub and the brake disk is made of a hard material with high hardness, it has little wear and is highly durable.

Furthermore, in the present invention, a hard retainer is fitted to the mounting boss of the wheel hub, and the engaging portion of the brake disc is fitted and fixed to this, so that the brake disc can be easily mounted to the wheel hub. be able to.

Furthermore, in the present invention, the U-shaped peripheral portion of the retainer is interposed between both circumferential surfaces of the mounting boss and the engaging surfaces of the engaging portion opposite thereto, and the braking torque acting on the brake disc is transmitted through the engagement of the retainer. Since the braking torque is transmitted to the joint part, the U-shaped peripheral part of the retainer, and the mounting boss of the wheel hub, braking torque is not applied to the bolts used to attach the brake disc to the wheel hub, and the bolts can be firmly maintained in a tightened state. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a conventional disc brake device for a motorcycle, FIG. 2 is a side view illustrating an embodiment of a disc brake device for a motorcycle according to the present invention, and FIGS. 3 and 4 are Figure 2 -
5 is an exploded view of FIG. 4, and FIG. 6 is a plan view of the main part thereof. DESCRIPTION OF SYMBOLS 1...Rear wheel axle, 2...Rear fork assembly, 3...Bearing, 4...Rear wheel hub, 5...Mounting boss, 6...Cylindrical portion, 7...Final driven flange, 8...
Driven sprocket, 9... Bolt, 10...
Brake disc, 11... Protrusion, 12... Cooling air passage, 13... Rib, 14... Retainer, 1
5... Peripheral part, 16... Clamping part, 17... Side panel, 18... Cooling air inlet, 19... Outer circumferential part, 20... Bolt, 21... Gap, 22... Caliper member, 23 ... Padded, 24 ... Caliper piston.

Claims (1)

[Scope of utility model registration request] A plurality of mounting bosses are integrally formed on the side surface of the wheel hub in the circumferential direction, and engaging portions corresponding to the mounting bosses are formed on the outer periphery of the brake disc,
In a disc brake device for a motorcycle in which an engaging portion of the brake disc is fitted and fixed to a mounting boss of the wheel hub, a hard elastic retainer interposed between the disc and the hub is provided at both circumferential ends of the mounting boss. It consists of a U-shaped peripheral part that abuts the surface located at the center and the inner surface near the center, and a clamping part that extends integrally from one side edge of both circumferential ends of the U-shaped peripheral part. The clamping section is arranged such that the angle between both circumferential ends of the shaped peripheral part and the clamping part is smaller than the angle between the surfaces located at both circumferential ends of the mounting boss and the side surface of the wheel hub. The U-shaped peripheral portion of the hard elastic retainer is interposed between the mounting boss and the brake disk, and the clamping portion of the hard elastic retainer is interposed between the wheel hub and the disk. A disc brake device for a motorcycle, characterized in that a disc is held between a cover member attached to the wheel hub and the wheel hub.