Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Including lubrication or particular guide or bearing for...
Patent
1995-08-10
1997-02-18
Schoeppel, Roger J.
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Including lubrication or particular guide or bearing for...
384615, F16H 5556
Patent
active
056036701
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an arrangement for guiding a movable disk in a continuously variable belt-drive transmission according to the preamble of the first claim.
Continuous belt-drive transmissions have a conic disk pair respectively on the input and output shafts. Between said conic disk pairs extends a belt, chain or link conveyor which winds around the input and output shafts. Each pair of conic disks consists of a first conic disk firmly connected with a shaft and a second conic disk movable in the axial direction. The axial position of the second disk is changed by a hydraulic actuation device. The effective diameter of the wind-around means and thus the gear ratio are thereby changed.
DE 38 16 357 has disclosed a continuously variable belt-drive transmission of the conic disk type. A movable disk shown therein is supported on loose balls. Said balls are guided in ball races which are attached, in the axial direction, to the shaft and the shank of the movable disk. The shaft and the shank have several such ball races. Two securing elements form the left and right stops for the balls. The balls are freely movable therebetween in the axial direction. In this design, it is a disadvantage that the securing elements and the balls have to be individually mounted by an apparatus or by hand, which is complicated and time consuming.
The problem on which the invention is based, is to seek, in a compact construction, a solution that facilitates assembly of a shaft/disk connection capable of load bearing.
According to the invention, the problem is solved by embedding the balls in a mounting and coordinating the balls with a ball race. The mountings are mostly interconnected in a narrow area. Thereby, the advantage that all the balls are inserted in only one step is obtained. The solution according to the invention is obviously applicable to other rolling bodies. Said mountings and connections are usually made of sheet metal or plastic. Balls of the same tolerance are identified by a colored mark on the mounting.
In a development of the invention, it is proposed that the interconnection of the mountings be a securing ring. The securing ring is slotted for better assembly. The axial path of the securing ring is determined by sitting the securing ring in a shaft groove or by the securing ring abutting on two surfaces. The bearing surfaces can result, for example, by a recess of the shaft. Since the securing ring, the mounting and the balls form a unit, the axial path of the balls is also thus defined. Unlike the prior art, the second securing element is eliminated. The mounting/securing ring connection can be releasable, such as by denting, and also unreleasable, such as by the mounting and the securing ring being made of one plastic part.
In another embodiment of the invention, it is proposed that the securing ring has several supporting portions. The supporting portions are situated on the outer periphery of the securing ring. The axial path of the securing ring is now determined by a surface in the hub of the movable second disk and by a surface on the shaft on which the supporting portions abut. Thereby, the resistance moment of the shaft increases. A slight axial displaceability of the mounting and securing ring arrangement means shorter ball races. From this results the advantage that the hub of the movable disk can be designed shorter. From this results a lesser total length of installation for a conic disk pair.
An embodiment of the invention is shown in the drawings. In the drawings:
FIG. 1 shows a longitudinal section of a shaft with a conic disk pair;
FIG. 2 shows an embodiment of the securing ring with a mounting;
FIG. 3 shows a sectional view along line III--III;
FIG. 4 shows a longitudinal section of a shaft with a conic disk pair;
FIG. 5 shows a longitudinal section of a shaft with a conic disk pair; and
FIG. 6 shows an embodiment of a securing ring with mounting.
FIG. 1 shows, in longitudinal section, a shaft 1 having a conic disk pair. The conic disk pair consists of a conic disk 2 that is stationar
REFERENCES:
patent: 4487595 (1984-12-01), Quick et al.
patent: 4919643 (1990-04-01), Fuss et al.
patent: 5156462 (1992-10-01), Jacob et al.
patent: 5482382 (1996-01-01), Sato et al.
Schoeppel Roger J.
ZF Friedrichshafen AG
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