192 clutches and power-stop control – Clutches – Progressive engagement
Patent
1984-03-05
1986-01-28
Husar, Stephen F.
192 clutches and power-stop control
Clutches
Progressive engagement
74339, F16D 1100
Patent
active
045665699
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a synchronizing mechanism in a gearbox, preferably a vehicle gearbox, including a synchronizing muff rotationally fixed to a shaft and having external engagement teeth coacting with internal engagement teeth on an engagement sleeve surrounding the synchronizing muff, this sleeve being axially displaceable for engaging engagement teeth on a first synchronizing ring rotatably mounted on the shaft and unrotatably joined to a gear and formed with a conical friction surface for coaction with a complementary conical friction surface on a second synchronizing ring for synchronizing the rotation of the gear and the shaft.
For the purpose of facilitating the engagement of different gears in a gearbox it is usual to arrange synchronizing mechanisms ensuring during a gear-changing operation that the gears, which are to be engaged, are given the same rotational velocity before engagement takes place. Such synchronizing mechanisms may be implemented in different ways, but usually the elements which are to be coupled together are each provided with a conical friction surface, and by axial displacement of at least one of the elements the friction surfaces are brought into gliding and engagement against each other such that the elements assume the same rotational velocity. In order that the synchronization shall take place smoothly and rapidly it is desirable that the friction surfaces are made as large as possible and at a large radial distance from the center of rotation. To enable production of a comparatively small gearbox it is however also desirable to implement the synchronizing mechanism with small dimensions. These two contrasting desires have led to known synchronizing mechanisms often being compromise solutions.
The present invention relates to a synchronizing mechanism which meets the mentioned basic requirements with respect to the size of the friction surfaces and their radial distance from the center of rotation while at the same time the implementation of the synchronizing mechanism only requires comparatively small dimensions in axial extension.
In the inventive embodiment, a synchronizing muff is unrotatably joined to a shaft and with engagement teeth coacts with an engagement sleeve surrounding the synchronizing muff, the sleeve being axially displaceable for engaging engagement teeth on a first synchronizing ring rotatably mounted on the shaft. This ring is non-rotatably joined to a gear and is formed with a conical friction surface for coaction with a complementary conical friction surface on a second synchronizing ring, the periphery of the synchronizing muff being formed with a number of radial recesses in which radial locating abutments on the other synchronizing ring engage. The invention is thereby mainly characterized in that each abutment is formed with a radial hole in which a detent body is displaceably mounted and adapted for being brought by spring means into coaction with an interior annular groove in the engagement sleeve, the second synchronizing ring being axially centered relative the synchronizing muff by the detent bodies and the spring means.
Since the second synchronizing ring is located by the detent bodies it does not require any further attachment, which substantially simplifies the mechanism and reduces space requirements.
In an advantageous embodiment, the synchronizing muff is axially fixed relative to the shaft, and as a result of the engagement of the detent bodies in the interior groove of the coupling sleeve during a synchronizing operation it is only the second synchronizing ring which is given axial displacement to and from the engagement position with the first synchronizing ring. Disengagement of the detent bodies from the interior groove in the engagement sleeve can only take place when the members intended to be synchronized assume the same rotational velocity. The inventive implementation means that necessary force for operating the synchronizing mechanism will be comparatively small.
Further distinguishing features of the invention
REFERENCES:
patent: 2478355 (1949-08-01), Auten
patent: 4349090 (1982-09-01), Griesser
patent: 4425990 (1984-01-01), Griesser
Husar Stephen F.
Saab-Scania Aktiebolag
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