192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1988-09-29
1990-07-31
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Engaging surfaces
192 53R, 192 53F, 192107R, F16D 2304
Patent
active
049443780
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase application of PCT/EP 8700200 filed 11 Apr. 1987 and based, in turn, upon a Luxembourg application PCT/EP86/00222 filed 16 Apr. 1986 under the International Convention.
1. Field of the Invention
The invention relates to a synchronizing ring.
More particularly, the invention relates to a synchronizing ring for a synchronizing assembly in the drive train of an automotive vehicle.
2. Background of the Invention
Synchronizing rings of this type are known and are made of various metallic materials, for instance through casting, sintering, and so on (German open specification 20 55 345 and German Patent 31 22 522). The friction surfaces are produced through spraying, dense-sintering, cementing (such as in German Patent 27 44 994) or also by coating the friction surface of a synchro ring and the welding thereof (see EP 01 62 393 A1). As shown in these mentioned references, it is also already known to provide the friction surface with grooves or recesses for the evacuation of the lubrication oil.
Such synchronizing rings have proven themselves in practice in the most various combinations in the manufacturing of the ring itself. The coating with a friction surface and the affixing of drainage grooves depending upon the requirements and the construction of the synchronizing assembly. However, a high technological effort, and as a result, high costs are common to all these synchronizing rings, when high demands are made.
OBJECT OF THE INVENTION
It is the object of this invention to provide an improved synchronizing ring in a synchronizing assembly as described which is of lower production cost and requires less fabrication efforts.
SUMMARY OF THE INVENTION
This object is attained, in accordance with the invention, in a synchronizing ring have two mutually parallel conical surfaces which have a friction coating and are interrupted in a circumferential direction by a profile consisting of alternating lands and grooves, such that each groove in the outer surface corresponds to a land on the inner surface and vice versa.
The profiling of the entire synchronizing ring is technologically simple, and optimal ratios between the actual friction surfaces and the grooves and recesses can be produced in a cost-efficient manner.
This method makes possible a profiling already in the flat state, depending on the friction coefficient of the material and a coating, before as well as after the profiling, or also only then when the synchronizing ring with the conical surfaces is completed. Special advantages are achieved when both conical surfaces are used as friction surfaces.
According to a feature of the invention the division of the profiling is uniform in circumferential direction between a friction surface or land and a groove with each groove on one surface corresponding to the land on the opposite surface. The division or land or groove width is approximately 1/50 of the outer diameter, the depth of the groove being between 0.4 and 0.8 mm, the outer radii between the lands and the flanks of the grooves being 0.4 to 1.0 mm and inner radii between the flanks and the floor or each groove between 0.7 and 1.2 mm.
The friction layers may be molybdenum coatings and the friction surface may be interrupted in the circumferential direction and can be sintered.
The synchronizing ring can be cut from a disk and given the conical shape, can be shaped from a pipe segment, profiled to have the alternating lands and grooves, or can be fabricated from sheet material.
In the case of two friction surfaces combined with adroit profiling and dimensioning, a considerable increase of the friction surface results, with concurrent optimization of the recesses provided for oil transport. In this way it is possible to reduce the shifting force and the thermal stress and to accelerate the shifting operation.
In combination with molybdenum size-limited coating of both friction surfaces of the, as a rule, finished synchronizing ring, it is possible to achieve a high load capa
REFERENCES:
patent: 4267912 (1981-05-01), Bauer
patent: 4597484 (1986-07-01), Takiguchi
Bonck Rodney H.
Dubno Herbert
Zahnradfabrik Friedrichshafen AG
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