Brakes – Wheel – Transversely movable
Reexamination Certificate
1998-10-07
2001-04-17
Graham, Matthew C. (Department: 3613)
Brakes
Wheel
Transversely movable
C301S006100
Reexamination Certificate
active
06216832
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a component group for non-driven and non-steerable wheels of an automotive vehicle or the like, comprising a brake drum, a wheel hub, an anti-friction bearing, an axle journal and an assembly base for the non-rotating components of a drum brake, including brake shoes and associated mounting means as well as brake cylinders, brake pistons and parts for connection to the brake shoes.
In component groups of the afore-mentioned type, frequently, a plate section manufactured by punching and forming operations, such as deep-drawing, is used as the assembly base for the non-rotating components of a drum brake, with the plate section being so shaped that, in addition, it can assume the function of a mud plate. In a plate section of the afore-described type, a special stop is to be provided for supporting the brake shoes in the circumferential direction because the plate section as such for lack of an adequate thickness is not suitable for use as a stop. For this purpose, a dome-shaped bulge is formed in the plate section to which can be riveted a stop section. Not only does this involve relatively high operating efforts; it also requires a relatively great wall thickness of the plate section because substantial forces will have to be taken up and transmitted to the axle means on the vehicle side. Conversely, the assembly base made of sheet metal includes areas which in view of the uniform thickness of the starting material are substantially over-dimensioned and do not permit a weight reduction. An assembly base made of sheet metal for mounting the components of a drum brake on the vehicle side, it is true, can assume additional functions (stop, mud plate); however, with a view to adapting it to local load requirements and realizing a potential weight reduction substantial disadvantages are involved.
It is therefore the object of the invention to overcome, in a component group of the afore-described type, the defects especially involved with the assembly base for the non-rotating components, and to provide a component group which is generally easier and less costly to manufacture.
SUMMARY OF THE INVENTION
This problem, in the practice of the invention, is solved in that the assembly base, by die-casting or forging, is formed as a carrier plate having an integrally molded stop for circumferentially supporting the brake shoes, and that a separate, thin-walled mud plate is provided.
It has been found that adaptation of carrier plates of the afore-described type to load requirements locally greatly varying is substantially easier than adapting molds of sheet metal, and that, in the majority of cases, it is more advisable to provide a separate thin-walled component as the mud plate. An assembly base made of sheet metal, for safely transmitting the brake forces, must be of a solid plate-shaped configuration, while the assembly base of the invention—starting from a hub area—will only require individual radially extending webs so that while using the same material (steel) the total weight is reduced even though the wall areas, locally, are substantially thicker. It is true, when employing a light metal alloy for the carrier plate, the total material volume is increased; however, the total weight can also be kept lower than in a conventional assembly base consisting of a plate section.
Advantageous embodiments of the conception of the invention and additional details will be described in closer detail with reference to the embodiments.
REFERENCES:
patent: 2144025 (1939-01-01), Brie
patent: 2903051 (1979-08-01), None
patent: 3714275 (1988-11-01), None
patent: 4203173 (1992-08-01), None
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patent: 19622520 (1997-11-01), None
patent: 0550822 (1993-07-01), None
Doell Andreas
Kautenburger Michael
Rettig Marc-Oliver
Schorn Michael
Continental Teves AG & Co. OHG
Graham Matthew C.
Rader & Fishman & Grauer, PLLC
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