JPH11105769A - Disc brake device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispose the fitting part of a bake disc so as to be non-offset relative to the bearing part of a caliper bracket. SOLUTION: This device is constituted by fitting the inner periphery side end part of a brake disc 42 consisting a front wheel brake device to a disc flange 51 of large diameter formed at one side surface of a front wheel hub 50 with a bolt 52, forming a boss part 53 of small diameter protruding sideward inside the disc flange 51, and fitting the inner end part 61 of a bracket boss part 60 formed integrally with a caliper bracket 40 to the inner periphery side of a seal 55 formed at the inner surface on the protruding end side. The bracket boss part 60 is of cylindrical shape extending in the axial direction of an axle 31, and is supported on the axle 31 so as to be rotatable by an outer bearing 62 and an inner bearing 63 disposed at the axial inner part of both end parts with a space put between them, and a disc center C passes through the outer bearing 62 side rather than the inner bearing 63 of the bracket boss part 60. It is thus possible to form the fitting part against the fitting part for the disc flange 51 of the brake disc 42 so as to be a non-offset position by the outer bearing 62 and the inner bearing 63 of the bracket boss part 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disc brake device for a motorcycle.

[0002]

2. Description of the Related Art A general disc brake device for a motorcycle includes a brake disc mounted on a hub of a wheel supported to a vehicle body via an axle, a brake caliper for braking the brake disc, and a brake caliper. And a caliper bracket rotatably supported on the axle via a bearing for supporting the brake disc, and the mounting position of the brake disc is often offset from the bearing position of the caliper bracket. However, there are cases where it is desired to adopt a non-offset arrangement for such a structure.

On the other hand, Japanese Utility Model Publication No. 2-20157 discloses a disc brake device for a rear wheel for a motorcycle without such offset. A hub end plate having a substantially rectangular coupling projection at the center is attached to the hub side surface of the rear wheel in this device, and a coupling recess is formed on the inner peripheral portion of the brake disc to fit the coupling projection. A boss is provided, and the hub end plate and the brake disc are integrally rotatably connected by fitting the connecting projection and the connecting recess.

On the caliper bracket side, a bracket boss portion is supported on the axle via a needle bearing, and is relatively rotatably fitted inside the boss portion of the brake disc via a ball bearing provided on an outer peripheral portion. ing. The needle bearing and the ball bearing are provided coaxially, and are arranged so as to overlap with the position where the rotating surface of the brake disk passes.

With this arrangement, the outer periphery of the boss portion of the caliper bracket is held down by the boss portion of the brake disc, and the boss portion of the brake disc is supported by the hub, thereby increasing the support rigidity of the boss portion of the caliper bracket. Since the brake disk is disposed so that its rotating surface passes through the bearing, the offset arrangement is eliminated.

[Problems to be solved by the invention]

In order to increase the support rigidity of the bracket boss portion, it is advantageous to increase the span of the bearing portion supported on the axle, but there is a limit in the needle bearing. For this reason, in this example, the support stiffness of the bracket boss portion having a relatively short span must be increased, and a considerably heavy hub end plate and a boss portion of a brake disc are required, which increases the weight and the number of parts, and The structure is complicated. In addition, since the outer periphery of the bracket boss must be supported by the boss of the brake disc,
A simple loose fitting is not enough, but high-precision machining and assembling work are required. Therefore, an object of the present invention is to adopt a non-offset arrangement and also to solve the above-mentioned various problems.

[0007]

DISCLOSURE OF THE INVENTION In order to solve the above problems, a disc brake device for a motorcycle according to the present invention comprises:
A wheel supported on the vehicle body via an axle, a brake disc mounted on a hub of the wheel, a brake caliper for braking the wheel, and a rotatable via a bearing on the axle to support the brake caliper And a caliper bracket supported on the hub, the brake disc is mounted on a large-diameter disc flange formed on the side surface of the hub, and the caliper bracket is supported on the axle. Outer bearings and inner bearings are disposed at intervals on the inner side of the boss and along the axial direction of the axle, respectively, and the inner end of the bracket boss is inserted into the inside of the disc flange, and the rotating surface of the brake disc is inserted. Are disposed so as to pass between the inner and outer bearings.

[0008]

According to the present invention, since the outer bearing and the inner bearing are arranged at intervals on the inner side of the bracket boss portion and on both ends along the axial direction of the axle, the span between the inner and outer bearings can be sufficiently increased. By increasing the length, the support rigidity of the bracket boss portion on the axle can be increased, and the outer peripheral portion of the bracket boss portion is fitted to the inside of the boss portion specially provided on the brake disk via a bearing as in the known example. No need to do.

Therefore, although the offset arrangement can be eliminated by disposing the rotating surface of the brake disk so as to pass between the inner and outer bearings, the brake disk only needs to be mounted on the disk flange portion, and the non-offset arrangement is not required. It does not require a special member with a heavy weight for realization, prevents the weight and the number of parts from increasing, and also prevents the structure from becoming complicated. In addition, since the bracket boss portion merely loosely fits inside the disc flange portion, the high-precision machining and assembly work required for the bearing surface is not required.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall side view of a motorcycle to which the present invention is applied, FIG. 2 is an enlarged side view of a link type front suspension part thereof, and FIG. 3 is 3-3 in FIG.
It is a line sectional view.

First, in FIG. 1, a link type front suspension 2 for supporting a front wheel 1 is rotatably connected to a head pipe 5 by a stem pipe 4 via a top bridge 3, and can be turned by a handle 6. I have.

The head pipe 5 includes a main pipe 8 disposed in the front-rear direction above the V-type four-cycle engine 7;
The front down pipe 9 is attached to each front end of the front down pipe 9 obliquely descending forward of the engine 7.

The rear part of the main pipe 8 is connected to a pivot plate 10 extending long in the vertical direction in a pair of right and left, and a rear swing arm 12 having a front end supported by a pivot part 11 of the pivot plate 10 extends rearward. The rear wheel 13 is supported. Rear swing arm 12
Is swingable up and down around the pivot portion 11 to form a rear suspension.

A seat rail 14 extends rearward from a rear portion of the main pipe 8, and a rear cowl 15 and a seat 16 are supported thereon. A fuel tank 17 is supported on the main pipe 8 in front of the seat 16.

The lower ends of the front down pipe 9 and the pivot plate 10 are connected by a lower frame 18 that passes below the engine 7 in the front-rear direction, and a radiator 19 is supported on the front down pipe 9.

As shown in FIG. 2, the link type front suspension 2 comprises a fork pipe 20, a push rod 21 and a shock absorber 22 parallel to the fork pipe 20, an upper link 23 connecting these intermediate parts in the vertical direction, and respective lower ends thereof. Are provided as a pair of left and right pivot links 24, respectively.

The fork pipe 20 on the right side of the vehicle body has a fender link 25 having one end connected to a vertically intermediate portion between the connection portions of the upper link 23 and the pivot link 24 and the other end connected to a front fender (described later). It has.

The left and right fork pipes 20 are connected at their upper ends by a top bridge 3 and at an intermediate portion to a steering stem 26. The top bridge 3 and the steering stem 26 are connected to the stem pipe 4 at each central portion, and the stem pipe 4 is rotatably supported in the head pipe 5.

The fork pipe 20 is a tapered pipe member whose upper portion is tapered upward from a connection portion with the steering stem 26 and whose lower portion is also tapered downward. It can be manufactured by a known method such as swaging the extruded pipe member into a tapered shape. The lower end of the fork pipe 20 is pivotally connected to one end of a pivot link 24 and a shaft 27.

The shock absorber 22 is composed of a known fluid damper having a built-in damper spring. The upper end is supported by the front of an upper bracket 28, and the lower end is connected to the upper end of the push rod 21 by a shaft 29. Is being worn.

The push rod 21 is fork pipe 20
The lower end of the pipe member extends downward substantially in parallel with the shaft member, and the lower end of the pipe member is axially attached to the intermediate portion of the pivot link 24 by the shaft 30. The other end of the pivot link 24 is connected to the axle 31 of the front wheel 1.
It is attached to the shaft.

The upper link 23 is disposed in the vicinity of a front fender 32 disposed between the left and right fork pipes 20 and the push rod 21, and has one end connected to the shaft 3.
3, the shaft is attached to the fork pipe 20, and the intermediate portion is attached to the push rod 21 by the shaft 34. The length of the upper link 23 between the shafts 33 and 34 and the length of the pivot link 24 between the shafts 27 and 31 are substantially equal.

Therefore, the fork pipe 20, push rod 21, upper link 23 and pivot link 24 constitute a substantially parallelogram link mechanism, and the front wheel 1
The push rod 21 moves substantially parallel to the fork pipe 20 in response to the vertical movement of the push rod 21.

The front ends of the left and right upper links 23
It extends further forward than the push rod 21, and its extended end is mounted on a stay 35 that projects downward from the front fender 32 with a shaft 36.

On the right side of the vehicle body, the fender link 2
5 is disposed substantially parallel to a position lower than the mounting position of the upper link 23, and one end of a shaft 38 is attached to a stay 37 that extends downward longer from a stay 35 on the right side of the vehicle body of the front fender 32, The other end is attached to the fork pipe 20 by a shaft 39.

The line connecting the shafts 36 and 37 of the stays 35 and 37 is substantially parallel to the axis of the fork pipe 20. The front fender includes the upper link 23 on the left side of the vehicle body, the fender link 25 on the right side of the vehicle body, and the stays 35 and 37. A substantially parallelogram link mechanism is constituted by the fork pipe 32 and the fork pipe 20, and the front fender 32 is moved up and down substantially in parallel in response to the vertical movement of the front wheel 1.

The caliper bracket 4 is provided around the axle 31.
0 is rotatably supported at one end and a caliper 4 is provided at the other end.
1 is supported, and can be slidably contacted with the brake disc 42 during braking to directly receive a braking force.

A stay 43 projecting rearward is formed integrally with the caliper 41, and one end of a torque link 46 is axially attached to the stay 43 by a shaft 45, and the other end is axially attached to the fork pipe 20 by a shaft 47. I have.

As shown in FIG. 3, a brake disc 42 constituting this front wheel brake device is mounted on a large-diameter disc flange 51 formed on one side surface of a front wheel hub 50 by an inner peripheral end portion with a bolt 52. Have been. A small-diameter boss 53 projecting laterally is formed inside the disc flange 51, and is rotatably supported on the axle 31 by a ball bearing 54 inside the boss 53, and a seal 55 is fitted on the inner surface of the projecting end. Have been.

An inner end 61 of a bracket boss 60 formed integrally with the caliper bracket 40 is fitted on the inner peripheral side of the seal 55. The bracket boss portion 60 has a cylindrical shape extending in the axial direction of the axle 31 and is rotatable on the axle 31 by an outer bearing 62 and an inner bearing 63 disposed at both ends in the axial direction at an interval. Supported.

The outer bearing 62 and the inner bearing 63 are spaced by a collar 64 on the axle 31. The outer bearing 6
A collar 65 is provided between the shaft bearing 2 and the pivot link 24, and a collar 56 is provided between the inner bearing 63 and the ball bearing 54.

The main body of the caliper bracket 40 extends upward from the bracket boss 60, and the mounting portion 70 of the brake caliper 41 is detachably connected to the upper boss 66 by a bolt 67.

The brake caliper 41 includes a pair of pistons 7.
1 are disposed opposite to both surfaces of the brake disk 42, and each pushes the support plate 72 toward the other side, thereby sliding the brake pads 73 attached to the surface of each support plate 72 to both surfaces of the brake disk 42. It is designed to make contact.

Passing through the center of the thickness of the brake disc 42,
The disk center C, which is a line parallel to the rotation surface, is located outside the inner bearing 63 of the bracket boss portion 60 (the outer bearing 62).
Therefore, the mounting portion of the brake disc 42 to the disc flange 51 is at a non-offset position with respect to the bearing portion by the outer bearing 62 and the inner bearing 63 of the bracket boss portion 60.

Next, the operation of this embodiment will be described. When hydraulic pressure is supplied to the brake caliper 41 to apply the brake,
A pair of pistons 71 disposed on both sides of the brake disc 42 respectively push the support plate 72 toward the other side, and push the brake pads 73 to the brake disc 42.
The rotation of the front wheel 1 is reduced or stopped by making sliding contact with both surfaces of the front wheel 1.

The braking force at this time is transmitted from the brake disc 42 to the caliper bracket 40 via the brake caliper 41. The disc center C passes through the outer bearing 62 side of the bracket boss portion 60 with respect to the inner bearing 63. Since the mounting portion of the brake disc 42 is not offset with respect to the bearing portion of the bracket boss portion 60, the twisting with respect to the brake caliper 41 as in the case of the offset configuration is reduced, and the problem caused by this is reduced. Less.

In addition, since the outer bearing 62 and the inner bearing 63 made of ball bearings are disposed at both inner ends of the bracket boss 60 with a space therebetween, the span between the inner and outer bearings is made sufficiently long so that the bracket boss 60 60 axles 31
The support rigidity on the top can be increased.

Therefore, in order to secure the support rigidity of the bracket boss portion 60, a boss portion of a hub end plate or a brake disk, which is a special member having a heavy weight, as in the above-mentioned known example, is used. There is no need to fit via a bearing. Therefore, the brake disk 42 need only be attached to the disk flange 51 without passing through these special members, and an increase in weight and the number of parts can be prevented, and a non-offset arrangement can be realized by preventing the structure from becoming complicated.

In addition, since the bracket boss portion 60 merely fits into the seal 55 of the small-diameter boss portion 53 formed inside the disk flange 51, high-precision machining and assembling operations required for the bearing surface are performed. It is not required, and the production becomes easy.

The present invention is not limited to the above-described embodiment, but can be variously modified. For example, the present invention can be applied not only to the front wheel brake but also to the rear wheel brake. In this case, the suspension device has a pair of right and left rear arms. The present invention can be applied to any type or a type having a cantilevered rear arm.

[Brief description of the drawings]

FIG. 1 is an overall side view of a motorcycle to which the present invention is applied.

FIG. 2 is a partially enlarged side view of a link type front suspension.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

[Explanation of symbols]

1: front wheel 2: link type front suspension, 2
0: fork pipe, 21: push rod, 22: shock absorber, 23: upper link, 24: pivot link,
31: axle, 40: caliper bracket, 41: brake caliper, 42: brake disc, 50: hub, 5
1: Disc flange, 60: Bracket boss, 6
2: Outer bearing, 63: Inner bearing

Claims (1)

[Claims] 1. A wheel supported on a vehicle body side via an axle;
A motorcycle including a brake disc mounted on a hub of the wheel, a brake caliper for braking the brake disc, and a caliper bracket rotatably supported via a bearing on an axle to support the brake caliper. In a disc brake device for a car, the brake disc is mounted on a large-diameter disc flange formed on a side surface of a hub, and a caliper bracket is mounted on a bracket boss portion supported on an axle and at both ends along an axial direction of the axle. Outer bearings and inner bearings were arranged with a space between them, the inside of the vehicle body of the bracket boss was inserted inside the disc flange, and the brake disc was arranged so that the rotating surface of the brake disc passed between the inner and outer bearings. A disk brake device for a motorcycle.