Drive pinion for rim gear/pinion drive

Details Drive pinion for rim gear/pinion drive Drive pinion for rim gear/pinion drive

1999-07-19

2001-02-13

Marmor, Charles A (Department: 3681)

Machine element or mechanism

Gearing

Yieldability in gear trains

C464S092000, C464S180000

Reexamination Certificate

active

06186019

ABSTRACT:

TECHNICAL FIELD
This invention relates to a drive pinion for a rim gear/pinion drive of rotary drums, such as used in tube mills, wherein the drive pinion meshes with a rim gear on the drum.
BACKGROUND OF THE INVENTION
In European Patent EP 0 175 109 B1, one or two drive pinions mesh with a T-section ring gear rigidly secured to the outside diameter of a drum. Drum flexures can lead to drum distortions, which lead, also in combination with various thermal expansions, to relative displacements and/or inclinations of the tooth flanks with nonuniform face width load behavior, so that the rim gear drive and its transmission of force can be endangered even with hardened tooth flanks. In order to distribute the load transmission in an approximately uniform way over the full face width of the drive teeth and to achieve a somewhat uniform load flank contact pattern, it has heretofore been proposed to use a so-called self-adjusting drive pinion, in which the pinion body is mounted on the pinon shaft with a seat in the form of a spherical cap. Such a pinion mounting can compensate for any alignment errors of the pinion and/or of the rim gear; however, such a pinion is very complicated in design and expensive to manufacture.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to create a drive pinion for a rim gear/pinion drive, which is simple in design and automatically adapts to varying operating conditions of the meshing of the pinion with the rim gear of the driven rotary drum.
The drive pinion is made self-adjusting by virtue of the fact that the pinion on the pinion shaft and/or the pinion shaft bearings to either side of the pinion and/or the pinion shaft pillow blocks are compliantly supported by spatially elastically deformable components. The pinion may have recessing in the axially spaced plane faces of the pinion for receiving annular elastically deformable components encircling the pinion shaft. The elastically deformable components support the pinion in elastically springing fashion on the pinion shaft. The drive pinion mounting functions like a ball-and-socket joint, without requiring a complicated design with spherically arched spherical-cap surfaces. By using the spatially elastically deformable pinion components, flank loading is uniformly distributed over the face width of the pinion teeth and uniform tooth trace contact is insured during meshing with the rim gear. Moreover, in contrast to a pinion with a seat in the shape of a spherical cap, the drive pinion is compliant in the radical direction through use of components that are elastically deformable in spring-like fashion. The radial compliance of the elastically deformable components can be set lower than the tooth stiffness of the pinon.
In the pinion of this invention, the transmission of torque can be separated from the transmission of transverse force. For the transmission of torque, a spline like toothing is provided on the pinion and the pinion shaft between the two annular elastically deformable components arranged in the region of the plane pinion faces. The spline like toothing can take the form of internal toothing and external toothing as well as the form of a feather key. The functions of torque transmission and transverse-force transmission can also be combined in one element. In order to achieve this object, the two annular elastically deformable components arranged in the region of the plane pinion faces can be clamped in so-called clamp set fashion between the pinion and pinion shaft.
According to a further feature of the invention, the spatially elastically deformable annular components can, as a structural unit, consist of an elastic busing with a metallic outer ring and a metallic inner ring, between which an elastomer ring of suitable elastic modulus is clamped concentrically.


REFERENCES:
patent: 2544809 (1951-03-01), Stanley
patent: 3368419 (1968-02-01), Puxkandl
patent: 3554045 (1971-01-01), Littmann
patent: 3682015 (1972-08-01), Richardson
patent: 4779470 (1988-10-01), Morita et al.
patent: 4854184 (1989-08-01), Jessup
patent: 5127279 (1992-07-01), Barthruff
patent: 5452622 (1995-09-01), Fenelon
patent: 5598749 (1997-02-01), Goto
patent: 5607023 (1997-03-01), Palm
patent: 0 175 109 (1990-01-01), None

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