Transmission assembly

Details Transmission assembly Transmission assembly

2000-08-29

2002-06-18

Bucci, David A. (Department: 3682)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley shifter

C474S133000, C474S135000

Reexamination Certificate

active

06406392

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a transmission assembly. More particularly, the present invention relates to a transmission assembly of a vehicle.
A conventional transmission system of a vehicle has a pressing plate to press a transmission chain. After a long period of usage, the pressing plate will not work very well so that the transmission chain will be damaged.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a transmission assembly which has an idle wheel to adjust a tightening degree of a transmission chain.
Accordingly, a transmission assembly comprises a frame, a transmission gear disposed on the frame, a driven gear disposed on the frame, and a transmission chain surrounding the transmission gear and the driven gear. The frame has a through hole. A torsion spring has a first end and a second end. A shaft rod has an annular recess. A swing arm has a round hole, a circular hole, and a through aperture. A pivot rod has an annular groove. The shaft rod is inserted in the round hole of the swing arm. The shaft rod passes through the torsion spring and the through hole of the frame. A first C-shaped retainer encloses the annular recess of the shaft rod. An idle wheel engages with the transmission chain. A Bearing is adjacent to the idle wheel. The pivot rod is inserted in the circular hole of the swing arm. The pivot rod passes through the Bearing and the idle wheel. A second C-shaped retainer encloses the annular groove of the pivot rod. The first end of the torsion spring is inserted in the through aperture of the swing arm. The second end of the torsion spring is hooked on the frame. The torsion spring forces the swing arm and the idle wheel to move and vibrate upward. When the transmission chain is tight, the degree of vibration of the swing arm is small and the degree of vibration of the idle wheel is small also. When the transmission chain is loosened, the degree of vibration of the swing arm is large and the degree of vibration of the idle wheel is large also. Therefore, the idle wheel will adjust a tightening degree of the transmission chain.


REFERENCES:
patent: 741042 (1903-10-01), Kailor et al.
patent: 1520949 (1924-12-01), Hemleb
patent: 1982299 (1934-11-01), Hapgood
patent: 3251235 (1966-05-01), Cederberg et al.
patent: 4312267 (1982-01-01), Shenberger
patent: 5569106 (1996-10-01), Splittstoesser et al.
patent: 81921 (1994-03-01), None
patent: 249307 (1994-09-01), None

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