Road structure – process – or apparatus – Apparatus – Means to agitate material
Patent
1980-12-05
1983-08-16
Byers, Jr., Nile C.
Road structure, process, or apparatus
Apparatus
Means to agitate material
308173, E01C 1938
Patent
active
043988431
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to an arrangement for supporting an eccentric mounting shaft within a capacitor drum by a pair of axially spaced bearing assemblies and more particularly to means for locating the bearing assemblies on the shaft to place the rotational axes of the drum and shaft in co-incident relationship relative to each other.
BACKGROUND ART
Vibratory compactors are commonly employed for compacting freshly laid asphalt paving, soils, and similar materials. The compactor comprises a drum resiliently and rotatably mounted in a frame assembly wherein an eccentric mounting shaft is located and rotates relative to the drum and which vibrates the drum to provide the desired compaction of the material being worked. The shaft is rotatably mounted in the drum by a pair of longitudinally spaced bearing assemblies which must exhibit high load-carrying capacities during operation of the compactor.
The bearing assemblies normally comprise spherical or tapered roller bearings which require precise preloading to insure maximum system rigidity. Continued use of the compactor oftentimes requires readjustment of the preloading to continuously insure such system rigidity. In addition, the outer races or rings of the bearing assemblies must be precisely aligned longitudinally by a line-boring operation to insure that the rotational axes of the shaft and drum are co-incident to avoid the imposition of adverse loads on the bearing assemblies. Such line-boring is expensive and does not always insure such precise alignment.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF INVENTION
In one aspect of the present invention, a vibratory compactor comprises a drum rotatable about its longitudinal axis, an eccentric mounting shaft rotatable about its longitudinal axis, and a pair of bearing assemblies mounting the shaft for rotation in the drum. The improvement in the compactor comprises self-aligning means for mounting each of the bearing assemblies on the shaft for permitting limited relative movement between the shaft and the bearing assemblies to place the longitudinal axes of the drum and the shaft in co-incident relationship relative to each other. The self-aligning means includes a sleeve mounted in each bearing assembly and a ball and socket connection mounting the mounting shaft.
The above improvement insures precise alignment of the shaft and drum without resorting to expensive and time-consuming processes, such as the need for line-boring the mountings in the drum for the outer races of the bearing assemblies. In addition, this invention provides that the bearing assemblies may exhibit a high load-carrying to size ratio in contrast to conventional bearing assemblies of this type. The self-aligning feature of this invention also eliminates the need for periodic readjustment of the preloading of the bearing assemblies and maintains them in a stress-relieved condition of operation.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of this invention will become apparent from the following description and accompanying drawings wherein:
FIG. 1 is a longitudinal and partially sectioned view through a vibratory compactor employing a self-aligning mounting arrangement embodying the present invention;
FIG. 2 is an enlarged sectional view more clearly illustrating the mounting arrangement for mounting an eccentric shaft in a drum of the vibratory compactor;
FIG. 3 is a sectional view illustrating a modified self-aligning mounting arrangement; and
FIG. 4 is a view taken in the direction of arrows IV--IV in FIG. 3.
BEST MODE OF CARRYING OUT THE INVENTION
FIGS. 1 and 2 illustrate a portion of a vibratory compactor 10 comprising a drum 11 rotatable about a longitudinal axis A thereof. One end of the drum is rotatably mounted on a mounting bracket assembly 12, secured to a frame structure 13 of a vehicle, by a pair of tapered roller bearing assemblies 14. The opposite end of the drum is connected to an electric or hydrau
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Tampo Manufacturing Co., Inc., (Undated).
Byers Jr. Nile C.
Caterpillar Tractor Co.
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