Process and arrangement for measuring multiple disk brake wear

Details Process and arrangement for measuring multiple disk brake wear Process and arrangement for measuring multiple disk brake wear

1994-10-12

1996-06-04

Chilcot, Richard

Measuring and testing

Brake testing

73132, G01L 528

Patent

active

055222595

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a process for measuring wear in multiple disk brakes, especially those that run wet, of axles with planetary gear units, in that a plug element, disposed in a predetermined bore in the wheel hub, is replaced by a screw-like component cooperating with a measuring instrument.
Multiple disk brakes, in particular oil-lubricated multiple disk brakes, are components that are indeed subject to relatively little wear; nevertheless, demands are made by the Technische Uberwachungsvereine [official automobile inspection agencies in Germany] that dictate at least sporadic measurement of wear, particularly at scheduled maintenance times.
In axles, it is known to unscrew the oil drain screw and to screw in a measuring instrument; the measuring instrument is secured against rotation by means of a screw plug. The measuring instrument itself is embodied as a screw that is provided eccentrically inside the screw that replaces the oil drain screw. This eccentrically disposed screw is moved toward the disk that supports the multiple disks, and the wheel is then rotated in the circumferential direction, so as in this way to avoid tilting of the disk. By means of a depth gauge, the distance between the end face of the wheel hub and the head of the screw is ascertained. One disadvantage of this process and arrangement is that on the one hand the screw that replaces the oil drain screw must be machined, which is expensive, so as to receive the eccentrically disposed screw. The eccentricity is required, to allow the measuring screw to be removed in the direction of the disk that supports the multiple disks; for safety reasons, rotation of the wheel must also be done, to preclude tilting of the disk.


SUMMARY OF THE INVENTION

The object of the invention is to conceive of a process for wear measurement of multiple disk brakes, and an arrangement operating by that process, with which the wear measurement can be done without major effort or expense, and the measuring instrument should be structurally simple and designed for various applications.
In terms of the process, this object is attained by a spindle, cooperating with the measuring instrument, that after brake actuation without further rotation of the wheel hub is moved up as far as the disk that axially supports the multiple disks, and this distance is ascertained as a first measured value, and next the brake is released again and the spindle is moved farther until it again comes into contact with the disk, and this distance is ascertained as a second measured value, wherein the difference between the two measured values is the piston stroke, from which the wear is ascertained.
Depending on the constructive design of the arrangement, the wear or in other words the relevant piston stroke can be read directly from the spindle, on the one hand, and on the other ascertained from the depth gauge of a measuring slide to be positioned against it from outside.
An arrangement operating by this process is characterized in that the spindle is movably guided concentrically inside the screwlike component, has a predetermined thread pitch, and is movable to a tilt-free region of the disk.
An arrangement operating alternatively by the process of the invention is characterized in that the spindle is embodied by the screwlike component, which on its end toward the disk cooperates with a concentrically disposed pin that is movable together with the component within a tilt-free region of the disk.
The concept of the invention is based on the fact that the air play of the respective multiple disk brake, which is equivalent to the piston stroke and increases as the friction linings wear down, is measured via a measuring spindle whose thread is located either in the screwlike component or in the wheel hub. In both variants, the axial distance between the wheel hub and the supporting disk is ascertained, once with the brake actuated (piston extended) and then with the brake relieved. The difference in the measurements is the air play in the brak

REFERENCES:
patent: 1690121 (1928-11-01), Klimek
patent: 2677959 (1954-05-01), Corey
patent: 3412603 (1968-11-01), Obarski
patent: 3641813 (1972-02-01), Groat et al.
patent: 3648511 (1972-03-01), Groat et al.
patent: 4136634 (1979-01-01), Wilson
patent: 4241603 (1980-12-01), Han et al.
patent: 4307604 (1981-12-01), Domitter
patent: 4948930 (1990-08-01), Karlsson
patent: 5167148 (1992-12-01), Black et al.
patent: 5343733 (1994-09-01), Nakagawa et al.

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