Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1998-07-07
2000-06-13
Schwartz, Chris
Brakes
Wheel
Axially movable brake element or housing therefor
188250D, 188250E, F16D 65095
Patent
active
060737328
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a disc brake arrangement for motor vehicles, according to the preamble of claim 1.
BACKGROUND OF THE INVENTION
In the brake yoke of disc brakes, the brake pad units are normally supported in such a way within a space, that they are prevented from rotating together with the brake disc. When the brake pad unit has worn down and the brake disc at the same time has been reduced in thickness, it may, however, occur that the brake pad unit, when almost completely worn out, slips out of its position and rotates with the disc. This may imply that the braking function is completely lost or that a complete locking of the brake disc occurs. In certain vehicles, transverse pins are provided which extend through holes, in the brake pad unit and keeps the unit in position. This construction may, however, gradually corrode and as time goes by imply jamming which, when bigger dimensions are concerned such as with disc brakes for heavy vehicles, may result in difficulties during maintenance.
One problem which is associated with a commonly occurring brake system for heavy vehicles is that the actuators, which diplace the brake pad units between braking and released position, exhibit portions at their ends which in certain conditions, e.g. when adjusting for the gradual wear of the brake pad units, are affected by torsional forces, which may cause damage to e.g. enclosing bellows and the like.
From the U.S. Pat. No. 3,162,271, it is previously known to arrange coupling means, between actuators and brake pad units in the form of T-shaped grooves and correponding pins on the actuators intended to interact with the grooves. By means of this interaction, a mutual transfer of the relative position of the actuators and the brake pad units is ensured, for instance by means of the brake pad units being brought to a released position by means of the return movement of the actuators. Since the pins, however, are completely rotationally symmetric, the end portions of the actuators will not become locked against rotation by means of the brake pad units. Consequently, this does not offer any solution to the above-mentioned problem.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device by means of which, on the one hand, the brake pad units are prevented from accompanying the movement of the brake disc and, on the other hand, prevents the end portions of the actuators from being entailed in rotational movements of the actuators when adjusting for the gradual wear of the brake pad units.
Said object is achieved by means of the device according to the present invention, the characterising features of which are evident from the subsequent claim 1.
By means of the device according to the invention, the brake pad units are kept in position so that, on the one hand, they cannot leave their main position in the brake yoke when worn out and, on the other hand, end portions of the actuators are maintained in a non-rotaable position in relation to the brake pad units.
DESCRIPTION OF THE DRAWINGS:
The invention will be described in the following in greater detail with reference to an embodiment and to the attached drawings in which:
FIG. 1 shows a brake yoke provided with the device according to the present invention, in a partially sectioned side view,
FIG. 2 shows two brake pad units according to the invention with associated coupling members, while
FIG. 3 shows a side view of a brake pad unit according to the invention with associated coupling members.
FIG. 1 shows a brake yoke 1 of a so called floating type, which thereby creates an extremely symmetrical force action on the portion of the brake disc 3 which protrudes into a recess 2, as indicated by dotted lines. The brake disc is in a conventional way firmly attached to a wheel hub for rotation together with a vehicle wheel of a motor vehicle, for instance a heavy vehicle, such as a goods vehicle. This symmetrical force action is achieved by means of the yoke being slidable in parallel to the axis of rotati
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AB Volvo
Schwartz Chris
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