Turning – Process of turning
Patent
1982-07-06
1985-01-15
Husar, Francis S.
Turning
Process of turning
82 28B, B23B 322, B23B 504, B23B 1902
Patent
active
044932316
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method and a device for machining worn brake disks of vehicles, particularly motor vehicles.
Wear or external actions during the use of vehicle brake disks can lead to surface damage, e.g. grooves or marks, long before the disk has been completely worn out. Since in particular internally ventilated brake disks have a considerable value, refacing is economically preferable to replacement if refacing costs can be kept low. Hitherto, brake disks have been dismantled for refacing in vehicle workshops, then mounted and turned on a machining machine, for example a lathe. In order to ensure adequate surface quality, flatness and plane parallelism, this work had to be carried out by trained personnel.
The object of the invention is to provide a method and a device enabling the machining of worn brake disks with low expenditure of both time and costs and giving good results.
According to the invention, this object is achieved by a method in which a separate drive is coupled to the vehicle axle or boss to which the brake disk is fixed and a machining tool is aligned with the vehicle axle. The brake disk fitted to the vehicle is moved relative thereto, and machined.
The device according to the invention can be constructed as a mobile device and has at least one coupling and centering device for connection to the vehicle wheel hub or shaft. Thus, with the vehicle jacked up, it is only necessary to remove the wheel and optionally the brake saddle with the brake linings, couple the device and start it up. The brake disk is then machined while installed, which saves time and costs in connection with the disassembly of the brake disk. It also excludes any possibility of errors in the precise true running of the machined brake disk, because the latter is machined in the fitted state. Thus, the device can be successively moved up to all four wheels of a vehicle, preferably by means of a chassis to which the device is fitted in such a way that its height and slope can be adjusted. The slope is adjustable to the axial slope of the vehicle with respect to the horizontal, i.e. about a pivot axis at right angles to the drive axis, and preferably also about a pivot axis parallel to the drive axis, so that the tools can be brought into a desired radial position of the brake disk if e.g. the latter is only freely accessible in a given position through a cutout in a cover plate. The only freely accessible area is normally in front of the axle and level therewith or at a certain angle of inclination thereto. To avoid rechucking of the tools during the refacing of the brake disks on the different sides of the vehicle, the rotary drive preferably has two oppositely directed coupling and centering devices or connections for the same, which are preferably driven in the same rotation direction and positioned at two ends of a drive shaft. The tool carrier is then moved between two working positions belonging in each case to one of the coupling and centering devices, so that there is no need to duplicate the tool carrier.
Although it would be possible to separately realise the rotary drive for the wheel axle and for centering the device ensuring the alignment of the tools and the movement direction thereof, particular preference is given to the coupling and centering device being a component which simultaneously transmits the rotary drive and aligns the device with respect to the wheel axle and it is advantageously a boss with screw connection possibilities for different wheel hubs.
A particularly preferred basic construction is obtained if the device has an elongated base part with a mounting support for a drive shaft arranged approximately centrally thereto with connections on both sides for the coupling and centering device, whilst in the longitudinal direction of the base part a guide for the tool carrier extends past the mounting support on one side.
For refacing the brake disk, the planar drive is preferably electromotively operable in a radially outwardly directed direction with respect thereto, which obvia
REFERENCES:
patent: 2551331 (1951-05-01), Miller
patent: 3592088 (1971-07-01), Welling
patent: 3691880 (1972-09-01), Ratteree et al.
patent: 4226146 (1980-10-01), Ekman
patent: 4388846 (1983-06-01), Kopeko et al.
Husar Francis S.
Terrell William E.
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