Brakes – Elements – Brake wheels
Patent
1998-02-09
2000-03-14
Butler, Douglas C.
Brakes
Elements
Brake wheels
188 732, 188264AA, F16D 6512
Patent
active
060359781
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a brake disk composed of several parts for a disk brake.
A generic brake disk is known from German Patent No. 2,013,535. With the known brake disk, a friction ring of a cast material is connected to a bowl-shaped holding part made of sheet metal. The holding part is fastened with screws to the hub of a vehicle wheel and supports the friction ring. Such composite brake disks have the advantage that the holding part can be made thinner and lighter than in a one-part brake disk, which is cast as a whole. Furthermore, no deleterious distortion of the friction ring occurs with generic two-part brake disks under the influence of high temperatures, because the holding part can absorb heat-induced deformation due to its elasticity. However, the known brake disk still requires a considerable manufacturing expense because the plastic deformation required for a form-fitting connection of the holding part to the friction ring cannot be achieved in a single simple operation. Instead, several operations are required to establish the connection. This makes the manufacturing process more expensive.
The object of the invention is to improve a generic brake disk to the extent that the manufacturing complexity and the related manufacturing costs required for connecting the friction ring and the holding part can be reduced.
SUMMARY OF THE INVENTION
This object is achieved by providing stamped tabs distributed around the circumference of the holding part; they can be produced by a simple movement of the stamping tool directed radially from the inside to the outside using a stamping tool that acts from the inside.
In contrast to that, a manufacturing process consisting of several operations is required with the known brake disc according to German Patent No. 2,013,535, because first the edge of the bowl-shaped holding part must be subdivided into numerous sections which must then be bent in the axial direction to reliably grip an inside edge of the friction ring. Apart from this, a shoulder in the edge area of the holding part is required for the type of attachment described here, so the friction ring can rest against it when it is clamped. The alternative method of attachment by welding as proposed in the aforementioned document is also more complicated and more expensive than that according to the present invention.
The joining technique according to this invention thus has the advantage that it can be carried out especially easily and inexpensively in one operation, without any need for refinishing the finished brake disk. In addition to the above-mentioned weight reduction and dimensional stability of the friction ring under the influence of temperature, however, there are also additional advantages of this invention. Thus, it is possible to use different materials for the friction ring and the holding part without any additional expense. For example, the friction ring or the holding part may be made of aluminum. In addition, an especially simple shape without any undercuts can be selected for the holding part, thus permitting simple and inexpensive manufacture of the raw holding part, especially in a single stamping operation. The stamping according to this invention for attaching the friction ring is shaped only when the holding part is joined to the friction ring. Thus, no additional preparatory steps are required. Finally, a worn brake disk can easily be broken down into its parts to permit separate recycling of the materials of the friction ring and the holding part.
In a preferred embodiment, the holding part is bent at its outer edge, forming a peripheral flange that projects radially. The radially inside edge area of the friction ring may be in contact with this flange of the holding part in one axial direction, so that the stamped tabs need only prevent the friction ring from sliding away from the holding part in the other axial direction in a form-fitting manner. The stamped tabs are arranged at a distance from the flange and are cam-like in design, thus res
REFERENCES:
patent: 2926760 (1960-03-01), Lucien
patent: 5299667 (1994-04-01), Hammond
patent: 5520269 (1996-05-01), Yamamoto et al.
Search Report of the German Patent Office Relating to Related German Patent Application No. 44 19 757.8
Bauer Jurgen
Metzen Hans-Peter
Butler Douglas C.
ITT Manufacturing Enterprises Inc.
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