Rotary shafts – gudgeons – housings – and flexible couplings for ro – Fluid coupling
Patent
1988-11-14
1991-10-01
Stodola, Daniel P.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Fluid coupling
1921062, 464 68, F16F 1512, F16F 1516
Patent
active
050529781
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to an elastic coupling with a multi-disk construction, particularly suitable for a divided flywheel for an internal combustion engine. Couplings of this type typically serve as an elastic connecting element with torsional-vibrational damping between an internal combustion engine and transmission connected behind the engine. The disk-like construction allows a space-saving compact installation of the transmission on the engine.
2. Prior Art
1. Federal Republic of Germany Pat. 28 48 748 corresponding to U.S. Pat. No. 4,351,167 discloses coupling that has two coupling halves, between which are disposed several spiral springs arranged in the circumferential direction; the springs are so connected in their action that they are loaded simultaneously and exhibit a substantially linear torque characteristic over their twist angle. Instead, springs of two different types can be installed and arranged in such a way that, on mutual twisting, one set of springs alone transmits the torque in a first angular range and, starting at a certain twist angle, the other springs are additionally loaded progressively. This known coupling has proven itself in the drives of automatic transmissions in combination with six cylinder engines, and in particular, in diesel engines Four-cylinder and five-cylinder engines, on the other hand, already exhibit a substantially more unfavorable torsional vibration behavior. Further aggravating factors for the coupling are shocks that are conducted through the coupling, for example, via the drive axles and/or the transmission on starting, gear changing and braking. In addition, influences on the torsional vibration behavior of the drive unit stem from differences in construction and configuration of the engines and transmissions of different manufacturers. The known coupling cannot satisfy these very different operating requirements.
SUMMARY OF THE INVENTION
It is the object of the invention to improve the known coupling in its spring characteristic and damping characteristic in such a way that it is suitable for being driven by an internal combustion engine with unfavorable torsional vibrational behavior due to the type of construction of that engine.
This object is achieved by the characterizing features disclosed and claimed herein. In contrast with the known coupling, in the invention, at least one further coupling element is involved in the transmission of torque between the two coupling halves. That further coupling element is also developed in disk form and is provided with window-shaped apertures at the circumference It is connected to the two coupling halves via flexible coupling elements, preferably in the form of springs that are inserted in the window-shaped apertures in such a way that these flexible coupling elements come into action one after another upon twisting. The following advantages are associated with this arrangement wherein a further coupling element is arranged between the side disks of the other coupling halves. The elastic range of the coupling is extended, so that the appropriate stiffness of the coupling is present over every load range. Because the further coupling element is connected to the two coupling halves by successively acting springs, there is a variable mass distribution within the coupling. The mass of the further coupling element, specifically, belongs sometimes to the first and sometimes to the second coupling half, depending on the twist angle. This is especially favorable in the idling condition of the internal combustion engine.
An essential feature of the invention is that damping upon twisting of the two coupling halves is improved. Furthermore, the further disk-shaped coupling element, which forms part of the boundary of a displacement chamber, has at least one surface that extends radially and effective in the circumferential direction that surface essentially corresponds to a similar surface on the first coupling half and is arranged in the same radial position relative t
REFERENCES:
patent: 2337134 (1943-12-01), Thelander
patent: 4351167 (1982-09-01), Hanke et al.
patent: 4601676 (1986-07-01), Tojima et al.
patent: 4782718 (1988-11-01), Hartig et al.
patent: 4788884 (1988-12-01), Reik et al.
patent: 4828533 (1989-05-01), Focqueur et al.
J. M. Voith GmbH
Stodola Daniel P.
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