Radial-mount type disk brake

Details Radial-mount type disk brake Radial-mount type disk brake

1999-07-02

2001-06-26

Oberleitner, Robert J. (Department: 3613)

Brakes

Wheel

Axially movable brake element or housing therefor

C188S073450

Reexamination Certificate

active

06250439

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a radial-mount type disk brake having its caliper fixed stably by improving the way in which the caliper is mounted.
A typical radial-mount type disk brake is shown in
FIGS. 5-7
. It has bolt holes
2
formed in the caliper
1
at its disk-leading (when the disk is rotating clockwise) and disk-trailing sides to extend perpendicularly to the disk axis. Mounting bolts
3
are inserted through the bolt holes
2
and threaded into a knuckle
6
to fix the caliper
1
to the knuckle
6
. This mounting arrangement provides higher rigidity of the caliper than an ordinary mounting arrangement, in which the caliper
1
is tightened by bolts extending parallel to the disk axis.
Such radial-mount type disk brakes are disclosed in unexamined Japanese patent publications 63-135623, 1-210628 and 7-12149.
In the radial-mount arrangement, as shown in
FIG. 6
, clearances t are formed between the bolts
3
and the holes
2
to absorb any unavoidable discrepancy in the pitch P between the bolt holes
2
, and the pitch P
1
between the threaded holes
7
formed in the knuckle
6
.
But with this arrangement, it is impossible to fix the caliper stably enough. When braking torque acts on the caliper
1
, the caliper
1
tends to turn in the direction M in
FIG. 5
by angular moment by a distance permitted by the clearances t as shown by chain line in
FIG. 5
, if the tightening force by the mounting bolts
3
are not enough. In the state shown by the chain line, the caliper mounting portion at the disk-leading side has moved toward the disk rotor
8
, while the caliper mounting portion at the disk-trailing side has moved away from the disk rotor
8
. Such dislocation of the caliper tends to deteriorate the braking performance, cause uneven wear of the pads
4
, and increase the brake squeaks.
An object of this invention is to prevent turning of the caliper due to the clearances between the mounting bolts and the bolt holes.
SUMMARY OF THE INVENTION
According to this invention, there is provided a radial-mount type disk brake comprising a caliper, a disk rotor, a knuckle for supporting the caliper, the caliper being formed with bolt holes extending perpendicularly to the axis of a disk, and mounting bolts each inserted through the bolt holes and threaded into the knuckle to fix the caliper to the knuckle, characterized in that abutment surfaces of the caliper and the knuckle include at least one surface perpendicular to the axis of the disk.
The abutment surfaces perpendicular to the disk axis are preferably arranged such that the surface of the caliper at its disk-leading side faces an end face of the disk rotor, and the surface of the caliper at its disk-trailing side faces away from the disk. Also it is preferable to provide two or more of such perpendicular surfaces parallel to each other.
Such perpendicular surfaces may be formed on separate members (such as collars) mounted on the caliper.
Since the abutment surfaces of the caliper and the knuckle have surfaces perpendicular to the disk axis, pivoting of the caliper by the angular moment M in
FIG. 5
is prevented by the binding action of these surfaces. Although this effect will reveal to the maximum if two or more of such perpendicular surfaces are provided parallel to each other, one can expect this effect anyhow by providing one of each such surface at the disk-leading and disk-trailing sides. But in the latter arrangement, the effect may lessen according to the positions of the surfaces. Therefore, in the latter arrangement, the surface positioning as shown in
FIG. 1
is preferable.
Other features and objects of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:


REFERENCES:
patent: Re. 29582 (1978-03-01), Brown
patent: 2399010 (1946-04-01), Eksergian et al.
patent: 3363727 (1968-01-01), Thirion
patent: 3933226 (1976-01-01), Maurice
patent: 4613019 (1986-09-01), Giorgetti
patent: 5217093 (1993-06-01), Carpenter
patent: 5735368 (1998-04-01), Kobayashi et al.
patent: 6068091 (2000-05-01), Finley
patent: 2173268 (1986-10-01), None
patent: 62-177327 (1987-04-01), None
patent: 63-135623 (1988-06-01), None
patent: 1210628 (1989-08-01), None
patent: 7-12149 (1995-01-01), None
An English Language abstract of JP 7-12149.

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