Process for fracture separating the bearing cover of a multi-par

Details Process for fracture separating the bearing cover of a multi-par Process for fracture separating the bearing cover of a multi-par

1996-10-23

1998-02-10

Footland, Lenard A.

Bearings

Rotary bearing

Plain bearing

2989812, F16C 1702, F16C 4302

Patent

active

057161453

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

This invention is based on the preamble of Claim 1 of U.S. Pat. No. 4,684,267.
That document describes a process for fracture separating the bearing cover of a multi-part bearing arrangement in an engine unit of an internal-combustion engine, in which case an embodiment where the fracture separating surfaces of the bearing cover and the engine unit, which correspond in pairs in an accurately fitting manner, are situated essentially in a common plane.
From U.S. Pat. No. 1,916,292, a multi-part bearing arrangement is known for a crankcase having cylinders arranged in a V-shape, in which the bearing cover and the engine unit are braced with respect to one another by way of machined cut contact surfaces. The contact surfaces, which correspond in pairs by means of smooth surfaces, are arranged in planes which together enclose an obtuse angle, for reducing the stressing of the crankshaft bearing cover.
It is an object of the invention to further develop the fracture separating process of the above-mentioned type in that also fracture separating surfaces which extend in a sloped manner with respect to one another can be achieved in arbitrary bearing arrangements, preferably for crankcases having cylinders arranged in a V-shape.
This object is achieved by the arrangement of Claim 1. The invention advantageously permits, in the case of a crankcase having cylinders arranged in a V-shape and integrally molded-on bearing covers, their fracture separating from the crankcase with fracture separating surfaces which extend essentially in planes sloped with respect to one another at an obtuse angle. Optionally, as far as its size is concerned, the obtuse angle may correspond to the supplementary angle of the V-angle between the cylinders. By means of separating areas between the engine unit and the bearing cover prepared according to the invention at a predetermined obtuse angle .alpha., fracture separating surfaces are reliably achieved which extend in a correspondingly sloped manner by means of, in addition, designing the half-mandrel according to the invention with a curvature radius reduced with respect to the receiving bearing bore by 0.5% to 5%. The design of the half-mandrel according to the invention, during the fracture separating operation, results in an elastic deformation of the bearing cover which favorably influences the course of the fracture separating in the direction of the separating areas arranged at an obtuse angle.
The curvature radius of the half-mandrel may have a constant value; however, it may also be selected to be variable for achieving a partially elliptic cross-section for the half-mandrel.
In a first embodiment of the fracture separating process, another, preferably identical half-mandrel is assigned to the half-mandrel for fracture separating the bearing cover in the bearing bore by means of a separating wedge, and a fracture separating force is generated in the bearing bore by means of the thus formed expanding mandrel.
In a further development of the process according to the invention, a particularly simple construction of the separating areas takes place by means of steps created by a removal of material at least on one end face side of the bearing arrangement. These steps form a cross-sectional discontinuity in the bearing arrangement which ensures, in combination with the curvature radius of the half-mandrel selected according to the invention, that fracture separating surfaces are obtained in planes which are sloped with respect to one another at an obtuse angle. When the obtuse angle .alpha. is selected to be large, the curvature radius of the half-mandrel is preferably selected to be by 0.5% to 1.5% smaller than the constant curvature radius of the bearing bore receiving the half-mandrel.
Within the scope of the further development according to the invention, a bearing cover of the bearing arrangement may be machined simultaneously on both end face sides by means of a set of disk milling cutters. The diameters of these cutters may be selected

REFERENCES:
patent: 3464746 (1969-09-01), Weber
patent: 4125637 (1978-11-01), Tanner
patent: 4523365 (1985-06-01), Richmond
patent: 4684267 (1987-08-01), Fetouh
patent: 4693139 (1987-09-01), Mukai et al.
patent: 5105538 (1992-04-01), Hoag et al.
patent: 5274919 (1994-01-01), Becker

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