Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1992-08-05
1995-06-06
Will, Thomas B.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 36, 277152, 277164, F16J 1516, F16J 1532
Patent
active
054215919
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a sealing arrangement with seals for rotation and linear movement to seal a component, which is passed through a wall from an inner to an outer space and effects rotating and/or linear movement, the seals being assembled to form a sealing set by means of a sleeve which is stationary in relation to the component.
Sealing arrangements of the kind mentioned above are to be found mainly in vehicles used in agriculture or the building trade. They are used, for instance, in steering and rigid axles or transmissions. In the practice, such sealing arrangements are exposed to the most unfavorable conditions. In the harvest of rice, agricultural harvesters are used in wet, slimy ground. Sealing arrangements adequate for said vehicles must ensure a perfect sealing under difficult external conditions. But at the same time, the expense for their production, assembly and maintenance of spare parts must be low.
In a sealing arrangement known already (prospectus of the firm Carraro: "Axles and Transmissions", imprint: 115256-09/87), a sealing arrangement for sealing the axle bridges is constructed in a manner such that a scraper and a shaft sealing ring concentrically and snugly surround the axially movable part of a double universal joint. Although such a sealing arrangement is of simple construction and inexpensive to make, a long duration is not ensured under the extreme conditions of use described.
The invention is based on the problem of providing a sealing arrangement which ensures a sufficiently long useful life even under extreme conditions of use while maintaining a simple construction.
The problem on which the invention is based is solved by the fact that the seals abut with external sealing and scraping elements on a bushing which is firmly connected with the wall. By virtue of the firm connection of the sleeve of the sealing arrangement with the component such as an axle half shaft of a steering axle of an agricultural vehicle, when the steerable wheels are guided into a path, the dirt is not passed directly toward the sealing arrangement but the sealing arrangement moves toward the axle center thus evading the dirt. With the construction principle according to the invention, it is possible to rule out the danger of damage due to caked dirt (soil, mud) or ice, since adhering particles are carried along in a steady position by the component and are not shifted against a stationary seal.
Another advantageous feature of the invention consists in that the sleeve has a collar that faces the outer space. The collar of the sleeve performs the function of a scraper of dirt. Said scraper is effective when the driven steering wheels are returned to their position corresponding to the straight ahead drive. The scraper is specially effective in the cases where the vehicle has been stopped with the driven steering wheels and dirt incrustation resulting in the outer space in the area of the sealing arrangement. In this manner, dried impurities (soil, mud or the like, or ice also) are reliably removed from the area of the sealing arrangement as soon as the vehicle is put in operation and the driven steering wheels are carried over to the straight ahead position.
By virtue of the configuration of the collar of the sleeve, it is possible in addition to affect the centrifugal effect. It is specially advantageous if the collar has an edge inclined in a direction toward the outer space. A high centrifugal effect is obtained due to said collar.
The sealing arrangement according to the invention is primarily adequate for sealing a drive shaft of a steered axle of a vehicle used in agriculture or the building trade, which is passed toward a hub from an axle bridge, that is, an inner space, through an outer space where the double universal joint rotates. In this arrangement, when a steering movement is introduced, the sleeve moves from its position corresponding to the straight ahead drive and relative in respect of the outer space in a direction toward the inner space. A specially long duration and sealing eff
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Product Engineering, Nov. 1948 pp. 122-123.
Beres John L.
Will Thomas B.
Zahnradfabrik Friedrichshafen AG
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