Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Nonplanetary transmission is belt or chain gearing
Reexamination Certificate
2000-04-13
2001-09-25
Wright, Dirk (Department: 3681)
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Nonplanetary transmission is belt or chain gearing
Reexamination Certificate
active
06293888
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a continuously variable transmission (CVT) and, more particularly, to a wide ratio coverage CVT which is adapted to enhance the transmission efficiency over the conventional CVT at low and high speeds and improve its application by providing a high torque driving force.
2. Description of the Related Art
In the prior art, a CVT uses a continuously variable unit section only resulting in the disadvantage of a rapid reduction in transmission efficiency at high and low speeds due to the characteristics of the continuously variable unit section.
Therefore, some problems arise in that the fuel efficiency is not good at high and low speeds, which adversely effects the exhaust emissions, and the transmission efficiency is decreased more at high and low speeds when used in large-sized vehicles (large automobile, truck, etc.), and as a result, the application of the CVT is limited.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a wide ratio coverage CVT to prevent rapid transmission efficiency deterioration at high and low speeds where only a continuously variable unit section is used.
Another object of the present invention is to provide a wide ratio coverage CVT with a fuel efficiency mode for providing optimized fuel efficiency, a power mode for dynamic driving, and a low speed mode for attaining an engine breaking effect.
Still another object of the present invention is to provide a wide ratio coverage CVT which has a wide ratio coverage and high efficiency at high and low speeds to prevent the deterioration of transmission efficiency at a high torque, thereby being applicable to large-sized automobiles and other devices requiring high torque, and which can be readily installed in any a front wheel, rear wheel or multi-wheel drive cars since it has input and output axes which are coaxially located.
To attain the objects of the present invention, there is provided a wide ratio coverage CVT which includes a driving power source, a first coupling axis, a clutch section, a second coupling axis, and a forward and rearward driving section, the CVT comprising: an input axis; an output axis located on the same axis with the input axis; a continuously variable unit section having a first continuously variable axis rotatably mounted on the output axis, a continuously variable driving part mounted on the first continuously variable axis, a continuously variable driven part mounted on a second continuously variable axis, and a continuously variable coupler for conveying the power from the continuously variable driving part to the continuously variable driven part; a coupling section having a first coupler integrally formed with the second continuously variable axis, a second coupler integrally formed with the output axis, and a third coupler for transmitting rotational power from the first coupler to the second coupler; and a gear section provided in the form of a gear set located between the input axis and the continuously variable unit section, the respective components of the gear section being operatively coupled to the input axis, the output axis, and the first continuously variable axis.
REFERENCES:
patent: 5470285 (1995-11-01), Schneider et al.
patent: 5803858 (1998-09-01), Haka
patent: 5803859 (1998-09-01), Haka
patent: 5827146 (1998-10-01), Yan et al.
Ladas & Parry
Wright Dirk
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