Abstract
A novel mechanical impulse continuously variable transmission (ICVT) is developed to provide continuously variable speed ratios and smooth acceleration for drivetrains based on a rotational swashplate, and its design principle is illustrated. A swashplate-guide linkage mechanism is used in the ICVT; the speed ratio of the ICVT is changed with the swirl angle of the rotational swashplate. A slider–linkage system, whose mo-tion is controlled by a speed-regulating handle, is used to adjust the swirl angle of the swashplate. A planetary gear system converts the regulated rotational speed of the swashplate to the output shaft of the ICVT. The speed range of the ICVT can be scaled up by coupling planetary gear sys-tems with different speed ratios. Overrunning clutches are used to rectify the rotational speed from the swashplate-guide linkage mechanism to ob-tain the output speed of the ICVT. Since the rotational swashplate can in-troduce large impulse rates of the instantaneous speed ratio, a connecting linkage is used to reduce the impulse rate and unbalanced inertial forces of the ICVT. Experimental tests of the output speed of the ICVT with four guide linkages verify the feasibility of the design and operation perfor-mance of the ICVT.
Highlights
A novel mechanical impulse continuously variable transmission (ICVT) is developed to provide continuously variable speed ratios and smooth acceleration for drivetrains based on a rotational swashplate, and its design principle is illustrated
This study presents a new ICVT with a rotational swashplate
Experimental tests for the operation performance of the ICVT prototype with four guide linkages are conducted on a test rig
Summary
The basic principle of the proposed ICVT is to convert the rotational speed of an input shaft to a rotational speed of a swashplate in a swashplate-guide linkage mechanism, and the rotational speed of the swashplate to the rotational speed of a driving gear in a planetary gear system. If the swirl angle of the swashplate changes, the rotational speed of planetary gears changes, and the amplitude of the output rotational speed of the sun gear changes. The slider connects to a nut that is installed on the control shaft. The position of the nut changes with rotation of the control shaft. The swashplate rotates around the point C, and its swirl angle changes with the position of the slider. Rotational motion of the swashplate transmits to planetary gears by using guide linkages. The rotational speed of the sun gear is transmitted by gear meshing of the planetary gear system, and it works as the output speed of the ICVT
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