Endless belt power transmission systems or components – Friction drive pulley or guide roll – Including plural – coaxial – circumferential belt-receiving...
Patent
1995-10-11
2000-10-31
Lillis, Eileen D.
Endless belt power transmission systems or components
Friction drive pulley or guide roll
Including plural, coaxial, circumferential belt-receiving...
474168, 242614, 29892, F16H 5549, F16H 5550
Patent
active
061394572
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sheet metal pulley, and particularly to a sheet metal pulley having an annular ear which projects outward from an end part of a cylindrical peripheral wall for winding a belt.
BACKGROUND ART
FIGS. 3 and 5 show a prior art sheet metal pulley A in which a circular base part and a peripheral wall for winding a belt are integrally formed by working, or the like, a flat sheet metal blank.
The sheet metal pulley A of FIG. 3 has a recess part 11 for accommodating a bearing (not shown), in an inner peripheral portion of a circular base part 1. A cylindrical peripheral wall 2 having poly-V grooves 21 and an ear 22 is integrally formed in the outer peripheral end of the base part 1. The base part 1 has a flat annular part 12 surrounding the recess part 11. The ear 22 has a double layer structure consisting of a first inclined part 23 which extends from the annular part 12 on the side of the base part 1, and a second inclined part 24 which is folded toward one face of the first inclined part 23 so as to overlap with the first inclined part.
In the sheet metal pulley A of FIG. 5, an ear 22 is formed so as to have a single layer structure, and the end part of the peripheral wall 2 on the side of the ear 22 is integrally connected with the base part 1.
In the sheet metal pulley A of FIG. 3, when a poly-V belt (not shown) is wound around the peripheral wall 2 and the pulley A is then operated, a crack a which is directed from the inner side to the outer side may be formed in a relatively short period in a folded portion 25 in the vicinity of the boundary of the first inclined part 23 and the second inclined part 24 as shown in FIG. 4. Also in the sheet metal pulley A of FIG. 5, a crack a which is directed from the inner side to the outer side may be formed in a relatively short period in a connecting portion 26 between the end part of the peripheral wall 2 on the side of the ear 22 and the base part 1.
The formation of the crack a and its cause in the sheet metal pulley A has intensively been investigated. As a result, it is found that, when the pulley is operated, the peripheral wall 2 around which a belt is wound, vibrates or oscillates about the folded portion 25 or the connecting portion 26 functioning as the fulcrum, with the result that the folded portion 25 or the connecting portion 26 is excessively fatigued.
The present invention is a result of studying the above-mentioned circumstances. It is, therefore, an object of the present invention to provide a sheet metal pulley in which a crack is hardly formed, by improving the structure of a base part connected with an end part of a peripheral wall so that, even when the peripheral wall vibrates or oscillates as the pulley is operated, fatigue is prevented from excessively occurring in one position.
SUMMARY OF THE INVENTION
In order to attain the noted object, a sheet metal pulley according to the present invention has a base part and a cylindrical peripheral wall for winding a belt integrally formed with it and has an annular ear projecting outward from an end part of the peripheral wall. The pulley is configured so that the base part is partitioned into an inner peripheral portion and an outer peripheral portion, the inner peripheral portion being connected with the outer peripheral portion through a bent part, and the outer peripheral portion being formed into a tapered shape which extends from the bent part. The diameter of the outer peripheral portion is increased toward the inner side in the axial direction of the pulley, and is connected with the end part of the peripheral wall on the side of the ear.
In another embodiment of a sheet metal pulley according to the present invention, in addition to the above-mentioned configuration, a recess part into which a bearing is to be fitted is disposed in the inner peripheral portion of the base part.
In the sheet metal pulley described above, when a belt is wound around the pulley and the pulley is operated (at high rpm), vibration and oscillation of the periphe
REFERENCES:
patent: 4468210 (1984-08-01), McCutchan, Jr.
patent: 4767387 (1988-08-01), Matsuoka et al.
patent: 5123166 (1992-06-01), Kanemitsu et al.
Kanemitsu Toshiaki
Oda Kazuyuki
Hartmann Gary S.
Kabushiki Kaisha Kanemitsu
Lillis Eileen D.
LandOfFree
Sheet metal pulley does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sheet metal pulley, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sheet metal pulley will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2045629