Severing by tearing or breaking – Breaking or tearing apparatus – Movable breaking tool
Patent
1996-06-06
1999-06-15
Rachuba, M.
Severing by tearing or breaking
Breaking or tearing apparatus
Movable breaking tool
225 93, 225 97, 2988809, B26F 300
Patent
active
059113499
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention is based on the preamble of claim 1 of U.S. Patent Document U.S. Pat. No. 4,684,267.
This known device, which can be used for several bearing arrangements of a crankcase of a piston engine, serves the purpose of a step-by-step fracture separating of the bearing covers which are cast in one piece with the crankcase. For this purpose, this known fracture separating device comprises a cylindrical supporting body which can be introduced into the bearing bore of several bearing arrangements and has transversely directed cuts provided in the spacing of the bearing arrangements with respect to the respective guided arrangement of a separating element designed approximately in the shape of half a disk. Recesses in the supporting body and the separating elements, which are provided in the center in the longitudinal course, are used for receiving an operating rod for the separating elements. The operating rod, which is operatively connected with an energy accumulator, has wedge surfaces assigned to the separating elements for the radial displacement of the separating elements in the bearing bores for generating fracture separating forces.
This known device, which comprises a guidance of each separating element which is separate from the operating rod, has the disadvantage of a proportion of frictional force which is high relative to the sum of all fracture separating forces and which, in addition to the energy accumulator with correspondingly large dimensions, also results in high expenditures with respect to energy. The frictional forces in the known device, which are in effect on the wedge surface pairs of the operating rod and the separating elements, also result in a wear of a varying distribution which acts against an advantageous, virtually one-step breaking operation in the case of each bearing cover. On the contrary, this results in a time-staggered breaking of the bearing covers with resulting fracture separating surfaces of varying qualities because, for later-breaking bearing covers, the unchanged total fracture separating force is distributed to a few residual bearing covers. Furthermore, in the case of this known fracture separating process, the bearing covers are first fracture-separated from the crankcase on one side, specifically in an uncontrolled manner, and, for the fracture separating, for avoiding a bending breakage, the fracture-separated side of each bearing cover is rotationally secured by high-expenditure additional measures, for example, by means of screws.
A device for fracture-separating bearing covers with a relatively favorable ratio of the proportion of the frictional force of the device to the fracture separating force to be applied is known from European Patent Document EP-B 0 396 797. In the case of this device used for the fracture separating of connecting-rod bearing covers, the operating linkage is a falling impact mass for affecting a guided carriage on which a half-mandrel is arranged which penetrates the bearing covers of the rotationally secured connecting rod and is fixedly connected with the carriage on both ends. In this case, the guided carriage is used for guiding the half-mandrel affecting the bearing cover for the purpose of fracture separating.
In the case of this device with a guidance of the fracture-separating-effective half-mandrel, it is also a disadvantage that the impact mass acting as the operating linkage springs back because of the material elasticities when impacting on the pushed carriage used for guiding the half-mandrel, and therefore, during the fracture separating operation, the impact mass and the carriage do not constantly act in the same direction. In a disadvantageous manner, fracture surfaces of formed cracks may strike on one another in a swinging manner and cause a breaking-out of materials.
Finally, another device is known from U.S. Patent Document U.S. Pat. No. 4,754,906 which is used for the fracture separating of a connecting rod bearing cover and has a guidance for a fracture-separatin
REFERENCES:
patent: 3884406 (1975-05-01), Bowen
patent: 4684267 (1987-08-01), Fetouh
patent: 4754906 (1988-07-01), Brovold
patent: 4768694 (1988-09-01), Fabris et al.
patent: 5263622 (1993-11-01), Henzler et al.
patent: 5274919 (1994-01-01), Becker
patent: 5503317 (1996-04-01), Jones et al.
patent: 5568891 (1996-10-01), Hoag et al.
International Search Report, Jul. 6, 1995, World-International.
Luchner Clemens
Wiesemann Johann
Bayerische Motoren Werke Aktiengesellschaft
Pryor Sean
Rachuba M.
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