Machine element or mechanism – Mechanical movements – Rotary to intermittent unidirectional motion
Patent
1997-10-06
1999-08-17
Herrmann, Alan D.
Machine element or mechanism
Mechanical movements
Rotary to intermittent unidirectional motion
475329, F16H 2904
Patent
active
059377011
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a variety of mechanical apparatuses for transmission of power, and more particularly to a variable speed change gear for use in automatic variable speed vehicles.
BACKGROUND ART
In comparison with electric motors, internal combustion engines used in automobiles or the like have a feature that the torque increases according as the speed of rotation goes up, with a small torque at a low speed of rotation. In automatic variable speed vehicles mounted with such internal combustion engines, use is made of, e.g., a torque converter for increasing the torque to make up for a lack of torque at a low speed rotation. Due to the torque converter which effects transmission of power with a slip, however, the automatic variable speed vehicles are inferior in accelerating ability and fuel efficiency to manual variable speed vehicles incorporating a pressure connection type clutch, with a slight shock at a gear change remaining unsolved. Recent development is therefore directed toward variable speed change gears capable of freely varying the change gear ratios and ensuring traveling within a range in which is generated maximum output or maximum torque of the engine. This will achieve improvement in accelerating ability and fuel efficiency, as well as elimination of shocks at a gear change, which are problems involved in the automatic variable speed vehicles. Currently known as the most typical variable speed change gear is one employing a metallic belt and a pair of pulleys, in which type the groove widths of the pulleys are continuously varied so as to vary the radii of the belt passing around the pulleys to thereby perform speed variation.
In the variable speed change gear serving to transmit the power with the aid of frictional force generated between the belt and the pair of pulleys as described above, inconveniently, a larger-sized apparatus is required for transmitting a higher level of power due to a reduction in efficiency of power transmission. This resulted in inability of application to widespread fields, including limitation to the small-sized vehicles if mounted on the motor vehicles.
The present invention was conceived in view of the above problems. It is therefore the object thereof to provide a variable speed change gear ensuring an effective transmission of power.
DISCLOSURE OF THE INVENTION
In order to achieve the above object, the present invention provides a variable speed change gear comprising an input side rotator rotationally driven by an external driving force; an output side rotator arranged concentrically with the input side rotator; a main driving rotator turning on the axis of rotation of the input side rotator under the action of a rotational force of the input side rotator; a plurality of driven rotators arranged on a predetermined circumference around the axis of rotation of the input side rotator, the driven rotators revolving along the circumference under the action of a rotational force of the main driving rotator; angular velocity varying means for periodically varying angular velocities of the driven rotators relative to the angular velocity of the main driving rotator; angular velocity correcting means for correcting periodically varying angular velocities of the driven rotators to be substantially constant within a predetermined phase range; and rotational force extracting means for extracting from the driven rotators only rotational forces having corrected angular velocities for transmission to the output side rotator. Thus, when the input side rotator is rotated by an external driving force, the resultant rotational force of the input side rotator is transmitted to the main driving rotator of which rotational force in turn is transmitted to the driven rotators. If, at that time, angular velocities of the driven rotators are periodically varied relative to the angular velocity of the main driving rotator, the periodically varying angular velocities of the driven rotators are corrected to be substantially constant in a
REFERENCES:
patent: 3359813 (1967-12-01), Okano
patent: 3803931 (1974-04-01), Bianchini et al.
patent: 3848474 (1974-11-01), Epstein
patent: 3892139 (1975-07-01), Harris
patent: 4114466 (1978-09-01), Meucci
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