Joints and connections – Member deformed in situ – Deformation occurs simultaneously with assembly
Patent
1996-12-30
1998-02-10
Hannon, Thomas R.
Joints and connections
Member deformed in situ
Deformation occurs simultaneously with assembly
403280, 403359, F16B 1100
Patent
active
057161569
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a shaft fastening according to the preamble of patent claim 1. It may also relate to a shank fastening instead of a shaft fastening.
Such a shaft fastening is described in German patent application P 4345099.7. This type of fastening allows a centric reception of the shaft to be fastened, in particular a pinion shank, within a receiving part with very high accuracy. The high centering accuracy is achieved in that, while the toothed shaft region B is cutting into a corresponding bore portion B' of a receiving part, the shaft is simultaneously guided centrically in the bore in front of and behind this portion. For this purpose, the bore of the receiving part and the fastening region of the shaft are divided into three portion A', B', C' and A, B, C respectively. At the same time, the three regions of the bore must in each case have different diameters which decrease in the joining direction. On the shaft, only the regions B and C, on the one hand, and A, on the other hand, must have diameters which are different from one another.
During the joining operation, the toothed region B of the shaft is drawn into the bore of the receiving part in addition to the region A. This is carried out in that the shaft, in the toothed region B, bears and is guided centrically with an accurate fit, via its tip circle portion, in the bore region C', until the shaft region B has cut completely into the associated bore region B'. In proportion as the guiding length of the shaft region B within the bore region C' decreases during the joining operation, the shaft region C engages with increasing length as centering ensuring an accurate fit.
When a genetic shaft having shaft regions B and C of equal diameter is being fastened, the following two joining variants are possible. the shaft region A begins only after the operation of cutting into the bore region B' has commenced. The centering of the shaft region C commences only after the shaft region B has begun to cut into the bore region B'. The condition for this version is: shaft regions B and/or C, on the one hand, and A, on the other hand. This presupposes that
As regards the generic shaft fastening, the invention is concerned with the problem of making it possible to design an equal diameter of the shaft regions B and C, in the case of a shaft region D with a toothing having a predetermined tip circle and root circle, to be as large as possible. The aim to design the regions B and C with as large a diameter as possible stems from the need to be able, in this region, to ensure as high strength, specifically, in particular, torsional strength as possible.
This problem is solved by designing the shaft regions B and C according to the defining features of patent claim 1.
This solution is based on the notion that the tooth spaces of the toothing are allowed to run out of the region D into the shaft regions B and C. In the initially mentioned version of a generic shaft fastening according to the older patent application, an equal diameter of the regions B and C was always designed in such a way that it was smaller than the root circle radius of the toothing of the region D. The reason for this was that an encroachment of the tooth spaces of the region D into the shaft regions B and C was considered as to be avoided without fail.
The essence of the present invention is that the opposite has been found appropriate here. Proceeding from this fundamental discovery, the region B of the shaft is designed with a hurling for cutting this region into the clearance of a connecting part, said clearance being circumferentially restricted solely to the regions which are located between the tooth spaces originating from the region D. This means that the relevant tooth space regions in the portion B make no contribution to the hurled connection within the receiving bore of the part to be connected. However, the strength of the connection is not impaired thereby, since the diameter of the region C can be selected to be so large that the remaining material is of sufficient siz
REFERENCES:
patent: 3396554 (1968-08-01), Westercamp
patent: 4416564 (1983-11-01), Billet et al.
patent: 4886392 (1989-12-01), Iio
patent: 5158390 (1992-10-01), Ito et al.
patent: 5309620 (1994-05-01), Shinohara et al.
Bayer Thomas
Hofmann Werner
Alpha Getriebebau GmbH
Hannon Thomas R.
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