| 摘要 |
A large-torque chain-guide type constant ratio/continuously variable transmission is disclosed. The transmission comprises transmission rollers (A, B), an endless transmission chain or belt (C) and two chain guiders (D, E) respectively arranged beside the two transmission rollers. Each chain guider comprises n groups of grooved-pulleys, and each group comprises m grooved-pulleys. Each grooved-pulley rotates freely around a grooved-pulley axis, and an angle α is formed between the axis of at least one grooved-pulley in each group of grooved-pulleys and a roller axis of the transmission roller matched with the same grooved-pulley. The angle α enables the chain entering the chain guider and the chain leaving the chain guider to move a certain axial distance, i.e. a chain distance, on the transmission rollers, wherein the chain distance is required to be larger than the width of the chain or the belt. The endless transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driving roller under the guidance of the chain guider, and is guided to a driven roller after winding n circles around both the chain guider and the driving roller. Whereafter, the transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driven roller under the guidance of the chain guider, and returns to the driving roller to be closed after winding n circles around both the chain guider and the driven roller. The transmission has small size and compact structure, and can output a large torque. |
| 主权项 |
1. A chain-guide transmission comprising drive rollers and an endless drive chain or belt (C),
the drive rollers comprise a driving roller (A) and a driven roller (B), further comprises a first chain guider (D) and a second chain guider (E), the first chain guider (D) and the second chain guider (E) are arranged beside the driving roller (A) and the driven roller (B) respectively, each of the first chain guider (D) and the second chain guider (E) comprises grooved-pulleys (D1, D2 . . . Dn) in a quantity of n+1, wherein n is a number of times the drive chain winds around each of the drive rollers; for each of the first chain guider (D) and the second chain guider (E), the n+1 grooved-pulleys are parallel to one another and arranged on a grooved-pulley axis, which means the n+1 grooved-pulleys are coaxial, each grooved-pulley rotates freely on the grooved-pulley axis, an angle (α) greater than 0 degree and less than 180 degrees is formed between the grooved-pulley axis and an axis of a respective drive roller that corresponds to the grooved-pulley axis, the drive chain or belt winding around the respective drive roller rotates the n+1 grooved-pulleys consequently, making the grooved-pulleys rotate in the same direction with that of the respective drive roller, the angle (α) between the grooved-pulley axis and the axis of the respective drive roller enables the drive chain to displace axially along the respective drive roller by a chain distance (d) in every next winding around the respective drive roller, wherein the chain distance (d) is larger than a width of the chain; the endless drive chain or belt (C) is directed by the first chain guider (D) to pass sequentially through a pulley groove of a first grooved-pulley (D1) on the first chain guider (D) to the driving roller (A), then to a next grooved-pulley (D2) on the first chain guider (D) and then back to the driving roller (A) again, and is guided to the driven roller (B) after winding n times around the driving roller (A), thereafter, the drive chain passes sequentially through a pulley groove of a first grooved-pulley on the second chain guider (E) to the driven roller (B), then to a next grooved-pulley on the second chain guider (E) and then back to the driven roller (B) again, after winding n times around the driven roller (B), the drive chain is joined with a tail part thereof to form a close loop. |
