Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Single impeller-turbine type fluid circuit divides or...
Reexamination Certificate
2000-01-31
2001-07-17
Wright, Dirk (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Single impeller-turbine type fluid circuit divides or...
Reexamination Certificate
active
06261198
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a continuously variable transmission, and more particularly, to a continuously variable transmission constructed in such a way that power input to an input shaft can be transmitted to an output shaft according to the status of a load applied to the output shaft without disengaging or changing gears when changing speed under the state in which all the gears are engaged, and that a reverse rotation driving can also be performed steplessly or at a fixed ratio in a simple manner.
BACKGROUND ART
Generally, in a transmission, speed change is done by selecting one of a number of predetermined gear ratios and at the time of effecting a speed change, there is the nuisance of carefully disengaging and changing gears. Conventional automatic transmissions are of a belt type which have a very complicated structure, are expensive to manufacture and cannot be widely used since they have a limited range of capacity because of wear, noise and slippage.
DISCLOSURE OF INVENTION
The present invention was made in view of the problems as described above, therefore, an object of the present invention is to provide a continuously variable transmission which does not use the complicated mechanism, responds quickly to a change in load, transmits the rotational force smoothly, changes the speed steplessly at forward rotation and reverse rotation by simple construction, reduces manufacturing cost, and provides an improved durability.
To achieve these and other objects, the present invention comprises a speed change system which receives power generated by an engine, changes the speed and transmits it to the output shaft, a speed change controlling system which can automatically control the ratio of rotation which corresponds to the load condition of the output shaft, and various 4 type reverse rotation systems, and especially the reverse rotation driving can be performed steplessly.
Summarizing the construction of the speed change system, the speed change controlling system and the reverse rotation system, the main characteristics of the speed change system is that it utilizes a compound planet gear unit that is, has 2 gear sets in which each same element (sun gear or ring gear) is removed from 2 planet gear sets (each including a sun gear, a carrier, and a ring gear), and transmits to the output shaft the power inputted through an appropriate combinational connection between the constitutional elements of gear set and at the same time through the input element(s) selected from 2 gear sets.
The speed change controlling system utilizes an improved torque converter which is improved over the torque converter of known automatic transmissions. Reviewing the construction of the speed change controlling system utilizing the terminologies related to the constitutional parts used in the conventional torque converter, for the convenience of explanation, the speed change controlling system comprises an impeller which is a driving body, a turbine which is a driven body, a stator for torque-increasing, a connecting shaft to be connected to the speed change system, a control shaft, and a fixed shaft for fixing the stator.
A reverse rotation system has a planet gear set (sun gear, ring gear, carrier) and a brake, and is constructed to accomplish the reverse rotation steplessly with an appropriate combinational connection between each constitutional element of the gear set and the speed change system.
The clutch and brake applied to the system of the present invention can utilize multi-disk wet-type clutch and brake of the known automatic transmission, and the brake can utilize a band brake, however, the clutch and brake are not limited to them.
REFERENCES:
patent: 4779487 (1988-10-01), Ptisch et al.
patent: 4932928 (1990-06-01), Crockett
patent: 5030178 (1991-07-01), Ming-luen
patent: 5415597 (1995-05-01), Ra et al.
patent: 9-166197 (1997-06-01), None
patent: 95/01522 (1995-01-01), None
Moon Byung Il
Oh Hyo Keun
Ra We Chool
Yoo Wan Moo
Aprotech Co., Ltd.
McDermott & Will & Emery
Wright Dirk
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