Actuating device with automatic readjustment of disc brakes, esp

Details Actuating device with automatic readjustment of disc brakes, esp Actuating device with automatic readjustment of disc brakes, esp

1994-09-30

1996-05-28

Oberleitner, Robert J.

Brakes

Wheel

Axially movable brake element or housing therefor

188 727, F16D 5508

Patent

active

055202675

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The instant invention relates to an actuating device as recited in the precharacterizing part of claim 1.


DISCUSSION OF THE BACKGROUND

Such an actuating device is known from German Utility Model 91 15 195. It comprises a lever-shaped actuator member which is fastened to an axial extension of a rotary member protruding out of the casing of the actuating device in a direction parallel to the axis of rotation of the brake disc.
Actuating devices of the generic kind in question usually are operated by a pneumatic diaphragm cylinder which must be rather large since it has to operate not only a service brake but also a parking brake. With some axle designs it is difficult, sometimes even impossible, to accommodate a large diaphragm cylinder at a place suitable for actuating the rotary member of the known actuating device.


SUMMARY OF THE INVENTION

It is, therefore, the object of the invention to improve an actuating device of the generic type specified, with automatic readjustment on a disc brake, so that it can transmit a clamping force sufficiently great for heavy vehicles, such as trucks and buses, and yet requires only little space.
The object is met, in accordance with the invention, by the features recited in claim 1.


BRIEF DESCRIPTION OF THE DRAWINGS

Further developments are presented in the subsidiary claims.
Embodiments of the invention will be explained in greater detail below, with reference to diagrammatic drawings, in which:
FIG. 1 shows a disc brake including an actuating device in top plan view, partly in section I--I of FIG. 2;
FIG. 2 is the lateral view of the brake shown in half section II--II in FIG. 1;
FIG. 3 is an enlarged cutout of FIG. 1;
FIG. 4 is the front view of the brake shown partly as section IV--IV in FIG. 1;
FIG. 5 is an enlarged cutout of FIG. 4;
FIG. 6 is a top plan view corresponding to FIG. 1 of a disc brake with a modified actuating device, shown partly as section VI--VI in FIG. 7;
FIG. 7 is the corresponding lateral view, shown partly as section VII--VII in FIG. 6;
FIG. 8 shows section VIII--VIII of FIG. 7;
FIG. 9 shows section IX--IX of FIG. 6, and
FIG. 10 is an enlarged cutout of FIG. 8 showing further details.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

The disc brake illustrated in FIGS. 1 to 5 is associated with an internally ventilated brake disc 10 and includes a brake carrier member 12 on which a floating caliper 14 is guided for displacement parallel to axis A of the brake disc 10. The guide means are embodied by two sleeves 16, each secured to the carrier member 12 by a bolt 18 with hexagonal recessed hole and protected against contamination by bellows 20. The floating caliper 14 encloses two brake pads 22 and 24 adapted to be urged each of the brake disc 10 and, as usual, each including a backplate to which a friction lining is attached. For replacement, the brake pads 22 and 24 can be pulled out upwardly through an aperture in the floating caliper 14, upon loosening of retainer pins 26.
A brake actuating device 28 is provided to actuate the left brake pad in FIG. 1, i.e. the inner brake pad 22 as regards the arrangement of the brake in a vehicle, to urge this brake pad to the right in FIG. 1 against the brake disc 10. Forces of reaction result as the inner brake pad 22 is urged into contact with the brake disc 10, and these reactive forces displace the floating caliper 14 to the left in FIG. 1, thereby pressing also the outer brake pad 24 which is supported on the floating caliper 14 against the brake disc 10.
The actuating device 28 comprises a casing 30 formed in one piece with the floating caliper 14 in the embodiment shown here. A cover 32 is fastened to the casing 30 by screws 34. In the cover 32 of the casing a round aperture 36 is left open which offers access to an end of a lever-like actuator member 38 which end is formed with a depression 37. Close to its aperture 36, the cover 32 of the casing is formed with two projections each having a fastening hole 40 for screw connection of a diaphragm cylinder 39 which is of c

REFERENCES:
patent: 3805924 (1974-04-01), Gambardella
patent: 3848704 (1974-11-01), Falk
patent: 4154321 (1979-05-01), Falk
patent: 4256206 (1981-03-01), Maehara
patent: 4697671 (1987-10-01), Stewart et al.
patent: 4727963 (1988-03-01), Villata
patent: 4923036 (1990-05-01), Margetts
patent: 4981197 (1991-01-01), Antony et al.
patent: 5086884 (1992-02-01), Gordon et al.

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