Joints and connections – Interfitted members – Clamped members
Reexamination Certificate
1999-01-14
2001-03-06
Kim, Harry C. (Department: 3629)
Joints and connections
Interfitted members
Clamped members
C403S337000
Reexamination Certificate
active
06196759
ABSTRACT:
DESCRIPTION
The present invention relates to a system for coupling a shaft and a blind, hollow member according to the preamble to the main claim.
A coupling of the above-mentioned type is required, for example, in the assembly of a machine comprising a rotary shaft an end portion of which is intended to engage a blind seat of a hollow member coaxial with the shaft and fixed for rotation with a spider or with a sun gear of an epicyclic reduction gear.
A coupling of this type between the parts mentioned has to ensure the transmission of a twisting moment between the shaft and the blind, hollow member whilst locking them together axially.
Naturally, this latter characteristic is required to prevent disassembly of the parts or annoying vibrations in the unit. In particular, the operative situation in which a transmission shaft is housed in a blind, hollow member does not permit easy axial fixing of the shaft at both of its axial ends as in couplings with hollow members having through holes.
A first known coupling system provides for the use of friction clamping or shrunk-on joints fitted on the blind, hollow member externally in the region of the seat housing the rotary shaft.
Tightening of the friction joint brings about both torsional and axial locking between the shaft and the hollow member. However, this system requires a fairly precise coupling between the parts and has the disadvantage of leading to damage of the shafts coupled when there are large overloads. Moreover, the large clamping force, together with impurities which are deposited in the coupling region during the operative life of the machine, tend to weld the coupling surfaces together, in many cases making their disconnection substantially impossible without irreparable damage to the parts concerned.
Finally, the use of friction joints involves costs which render the coupling system as a whole economically unfavourable.
A second known system for coupling a shaft and a blind, hollow member provides for the use of locking grub screws for fixing them axially. These screws are normally screwed into radial holes in the hollow member in the region of the seats for housing the shaft and clamped against the surface of the shaft.
This system is quite easy to produce but has not been found very effective in clamping shafts axially where large forces are involved.
The problem upon which the present invention is based is to provide a system for coupling a shaft and a blind, hollow member, which is designed structurally and functionally to overcome all of the problems complained of with reference to the prior art mentioned.
This problem is solved by the invention by means of a coupling system formed in accordance with the following claims.
REFERENCES:
patent: 2516472 (1950-07-01), MacKeage, Jr.
patent: 3119625 (1964-01-01), Marr
patent: 3454313 (1969-07-01), Lohneis
patent: 3638974 (1972-02-01), Stratienko
patent: 3803691 (1974-04-01), Geese et al.
patent: 3887290 (1975-06-01), Taylor
patent: 4311224 (1982-01-01), Kato et al.
patent: 4452547 (1984-06-01), Thiel et al.
patent: 5174680 (1992-12-01), Nakamura et al.
Casarotto Giorgio
Kim Harry C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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