JPH0689799B2 - Brake disc mounting device - Google Patents

Description

The present invention relates to an attachment mechanism for attaching a brake disc to a wheel, and prevents one-sided contact with a brake pad due to thermal strain of the brake disc. It is possible to prevent uneven wear of the brake sliding surface due to a hit.

[Prior art]

Multiple bosses (or protrusions) protruding laterally on the side of the spokes of the wheel to reduce the weight of the brake disc
A bolt hole is provided in the boss in the axle direction, a bolt insertion hole is provided at the end of the sliding portion of the brake disc, and a bolt is screwed into the bolt hole through the bolt insertion hole to attach the brake disc to the wheel. It is known to be fixed to the spokes.

However, regarding this conventional technology, when the brake disc is heated and causes thermal strain, the brake disc is fixed to the spokes and restrained, so that the brake sliding surface is deformed so as to slightly wavy and the brake pad is deformed. However, uneven wear will occur. If this uneven wear progresses, not only the braking ability and braking characteristics are impaired, but also the mass balance of the brake disc is disturbed, which may impair the rotational balance of the wheels.

[Problems to be Solved by the Invention]

The present invention relates to the above-mentioned prior art, in which the above-mentioned thermal strain is released at the mounting portion of the brake disc to the wheel spokes to prevent the deformation of the brake sliding surface as much as possible, and the brake disc has an aligning property with respect to the brake pad. Therefore, it is an object to devise a mechanism for attaching the brake discs to the spokes so that the above-mentioned one-side contact can be suppressed as much as possible.

[Means taken to solve the problem]

The measures taken to solve the above problems are as follows.
(C).

(A) A half-moon-shaped cutout is provided at the end of the sliding portion of the brake disc. (B) The half-moon of the brake disc is attached to the mounting bolt screwed into the bolt hole of the boss protruding from the side surface of the wheel spoke. The notch is engaged, and (c) the brake disc is attached to the boss by a mounting bolt so as to be movable in the axial direction within a certain range.

In addition, the above-mentioned sliding portion end means the radially inner end or the radially outer end of the sliding portion of the brake disc with the brake pad. Which one is adopted is the brake pad. Is arranged radially outward with respect to the brake disc or radially inward.

[Action]

The inner peripheral surface of the half-moon notch provided at the end of the sliding portion of the brake disc abuts and engages with the mounting bolt that is installed in the bolt hole of the boss that projects laterally on the side of the wheel spoke, and axially Since it is movable, the end of the sliding portion is free from being restricted by the boss in the circumferential direction and the radial direction of the brake disc, and is free, and the thermal expansion of the brake sliding portion is sufficiently released. Therefore, the deformation of the sliding surface of the brake disc due to the escape of thermal expansion is suppressed.

Further, since the brake disc is attached to the boss protruding from the side surface of the wheel spoke so as to be movable in the axial direction within a certain range, even if the sliding surface is deformed due to thermal expansion, the brake disc is braked. The disk has flexibility or alignment within the above-mentioned certain range. Therefore, the sliding surface of the brake disc can slide while following the braking surface of the brake pad, which can suppress uneven wear of the sliding surface as much as possible. Further, when the half-moon notch is provided at the inner peripheral end of the sliding portion, the inner peripheral surface of the mounting portion is radially inward from the virtual circle C (see virtual circle C in FIG. 3) passing through the center of the mounting bolt. Since there is no protrusion, the angle range θ in which the centering is possible (see FIG. 2A in comparison with FIG. 2B) becomes large. Therefore, the axially movable range ds (see the play ds in FIG. 2) can be made as small as possible. In other words, it is possible to secure great flexibility within a small axially movable range.

Therefore, the instability of the brake disc due to the axial movement can be reduced to the extent that there is no practical problem. The same applies when the half-moon notch is provided at the outer peripheral end of the sliding portion.

〔Example〕

Next, a first embodiment will be described with reference to FIGS.

A plurality of protrusions 61 are provided at equal intervals on the same circumference of the side surface of the spoke 25 of the wheel 15 of the wheel 11, and screw holes 45 are provided in the end faces of the protrusions 61.

The brake disc 29 is a ring-shaped member having a relatively narrow width, and almost the entire surface thereof becomes a sliding surface with the brake pad, that is, a brake sliding surface. A large number of mounting portions 29b arranged at equal intervals are provided at the inner peripheral end of the brake disc 29, and half-moon shaped notches 71 are formed in the mounting portions 29b. The radius of curvature of the half-moon-shaped notch 71 is slightly larger than the radius of the cylindrical portion 43a of the mounting bolt 43 having a step for mounting.
Further, the length S of the columnar portion 43a is larger than the thickness d of the mounting portion 29b of the brake disc 29. When the mounting bolt 43 is screwed into the screw hole 45 of the protrusion 61 and the brake disc 29 is attached to the spoke 25, the columnar portion 43a abuts the end face of the protrusion 61, so that the head 43b and the end face of the protrusion 61. A gap equal to the length S of the columnar portion 43a is held between and. Since this gap is larger than the thickness of the mounting portion 29b of the brake disc 29, the brake disc is supported by the mounting bolt 43 with its axial play ds. That is, the size of the axial play ds of the brake disc is defined by the length S of the cylindrical portion 43a of the mounting bolt.

Therefore, the brake disc 29 can move in the axial direction with respect to the cylindrical portion of the mounting bolt within the range of this play, and can also move in the tilt direction.

Next, a second embodiment will be described with reference to FIG.

In the second embodiment, a counterbore 51 is provided on the end face of the protrusion 61 of the spoke 25, a screw hole 45 is provided on the bottom thereof, and a collar 53 is fitted in the counterbore. The mounting bolt 43 is inserted into the collar and the threaded portion is screwed into the screw hole 45 to fix the collar to the protrusion. The distance S ₁ between the collar 53a of the collar and the end face of the protrusion 61 corresponds to the length S of the cylindrical portion in the first embodiment. That is, the second embodiment uses the collar with collar to define the axial play ds of the brake disc.

In this example, the mounting bolt 43 is engaged with the crescent-shaped notch 71 of the brake disc via the collar 53.

Further, a third embodiment will be described with reference to FIG.

In the third embodiment, a protrusion having a length S is provided on the end face of the protrusion 61.
81 is projectingly provided, and the head 43c of the mounting bolt 43 is brought into contact with the projection 81 to secure a gap S between the head 43c of the mounting bolt 43 and the end face of the projecting portion 61. That is, in the third embodiment, the protrusion 81 of the protrusion 61 is used to define the axial play ds of the brake disc.

Reference numeral 13 is a front hawk, 17 is a tire, 19 is a hub, 21 is a through hole, 23 is a wheel, 27 is a rim, and 31 is a braking pad.

〔effect〕

The present invention provides thermal expansion of a brake disc by giving flexibility to the brake disc in the radial direction, the axial direction, and the inclination direction by devising the structure of the attachment part of the brake disc and the structure of the attachment part that attaches the brake disc to the spokes. Since it is possible to suppress the deformation of the sliding surface as much as possible, it was possible to solve the above problems by taking an extremely simple means, which is an effect peculiar to the present invention. Is.

Further, an invention is known in which an inner peripheral portion of a brake disc fixed to a wheel hub is thinned to have flexibility so as to reduce restraint force by the fixed portion against thermal expansion and to have flexibility. However, in the present invention, since there is a limit to the thickness of the mounting portion from the viewpoint of ensuring the mounting stability of the brake disc, in practice it is not always possible to provide sufficient flexibility. Therefore, it is extremely insufficient in terms of solving the above problems. In addition, since the required flexibility cannot be obtained unless the thin mounting portion has a sufficient radial width, there is a demand for reducing the radial width of the brake disc as much as possible to reduce the weight of the brake disc. There is the problem of going against it. However, the present invention does not have such a problem, and can solve the above-mentioned problems to a sufficiently high degree as compared with the known invention.

Further, there is known an invention in which the brake disc is divided into a mounting portion and a sliding portion, and both portions are connected to each other by rivets so as to be movable in the axial direction so as to have flexibility. In addition to the same problems as in the invention, a special member such as a rivet is added to the brake disc in order to have flexibility, which causes a serious problem of increasing the weight of the brake disc. But,
The present invention does not have such a problem at all.

The above is the remarkable effect of the present invention as compared with the conventionally known inventions.

[Brief description of drawings]

FIG. 1 is a sectional view of the first embodiment, FIG. 2 is an enlarged view of a V portion of FIG. 1, FIGS. 2A and 2B are explanatory views of the action, and FIG. FIG. 4 is an enlarged sectional view of an essential part of the second embodiment, and FIG. 5 is an enlarged sectional view of an essential part of the third embodiment. 11 ... wheels, 15 ... wheels, 25 ... spokes, 29 ... brake discs, 43 ... mounting bolts, 61 ... projections, 71 ... half-moon shaped notches.

Claims (1)

[Claims] 1. A boss protruding laterally is provided on a side surface of a wheel spoke, a bolt hole is bored in the axle direction in the boss, and a mounting bolt is screwed into the bolt hole to mount a brake disc to a wheel. In this case, a half-moon shaped notch is provided at the end of the sliding portion of the brake disc, and the half-moon shaped notch of the brake disc is engaged with the mounting bolt screwed into the bolt hole. Brake disc mounting device mounted on the boss so that it can move in any direction.