Planetary gear transmission systems or components – Planet periphery surrounds axis of interacting gear – Circumferentially spaced connector pins
Patent
1995-06-28
1997-08-12
Wright, Dirk
Planetary gear transmission systems or components
Planet periphery surrounds axis of interacting gear
Circumferentially spaced connector pins
F10H 132
Patent
active
056559852
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gear system for transmitting rotary movements according to the preamble to claim 1. The invention further relates to a differential gear system by means of which eccentric and rotary movements of a planet wheel are transformed into central rotary movements of a slow-running crankshaft.
Previous gear systems of this type solve the problem of r.p.m. reduction between a slow-running and a fast running crankshaft in two ways, i.e. by a central system and a planetary system. The central system comprises an internal gear wheel, which is Securely fixed to a gear casing, and a planet wheel with external teeth, which meshes with the internal teeth of said wheel. The central crankshaft is rotarily mounted with respect to the internal gear wheel via its central portion and by means of high-speed bearings, while the planet wheel is rotarily mounted on the portion in a central cylindrical opening. The planet wheel is provided on its peripheral side with cylindrical openings. Engaging with these openings are linings which are set upon cylindrical pins with a small degree of play. The cylindrical pins are axially integrally formed in the body of the slow-running crankshaft, on the same circle and at the same intervals as is the case with the eccentric cylindrical openings of the planet wheel. The slow-running crankshaft is rotarily and centrally mounted in the wheel. The following facts are regarded as drawbacks to the known central system:
The load on the pins in the gear system is not effective, as upon transmission of the torque from the planet wheel to the slow-running crankshaft only one half of the entire number of pins is ever loaded in the radial plane. Moreover, the irregular distribution of load on the individual pins results in a high concentrated load on the pins most frequently loaded, which leads to increased wear on the given pin and on the lining. In order to obtain sufficient load capacity, sufficient strength and sufficient life duration of the gear system, it is necessary to have large cross-sections and numbers of pins, the slow-running crankshaft also having to be robust, the pins being freely supported. The result is that the weight of the gear system is considerably and undesirably increased. In such a gear system the central crankshaft leads to disproportionate concentration of the load in the radial plane, because the crankshaft not only transmits the effective load originating from the power effect, but also a load which originates from the torque. The previous gear system, during starting and at low speeds, does not form a lubricant layer between the pins and the lining, so that in this working range the device operates with a semi-dry friction. Consequently the pins and the linings are subject to increased wear, undesirable heat being generated, and in addition operation is interrupted, which is regarded as the source of undesirable vibrations. In gear systems with a higher transmission ratio there is a reduction in the tangential speed of rotation of the linings at the pins. In this way the field of application of the single-stage gear system is restricted. In order to overcome this restriction it is appropriate to use two, three or a plurality of gear systems incorporated in series. The result of this however is that the degree of effectiveness of such a gear system is reduced. A further restriction experienced by the previous gear system lies in its positioning. In the transmission of rotary movements from the planet wheel to a slow-running crankshaft the achievement of a low degree of play in the transmission chain is problematic. Moreover, at low revolutions of the slow-running crankshaft, the semi-dry friction already mentioned occurs.
Planetary systems are formed from two integrated gearing stages incorporated in series. The first stage is provided with a conventional spur gearing with straight teeth. It further comprises a high-speed planet wheel, which meshes with two or with three externally toothed gear wheels. These are securely fixed to a crankshaft and
REFERENCES:
patent: 3430523 (1969-03-01), Merritt
patent: 3994187 (1976-11-01), Milenkovic
patent: 4567790 (1986-02-01), Butterfield et al.
patent: 4594915 (1986-06-01), Braren
patent: 4690010 (1987-09-01), Matsumoto et al.
patent: 5123884 (1992-06-01), Kondoh et al.
Kasper Horst M.
Wright Dirk
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