| 摘要 |
The present invention relates to a stepless variable transmission device with parallel low gear wheel group, which is the first case that a low gear transmission wheel group equipped with a one-way transmission unit, which transmits with fixed speed ratio in same rotary direction, is installed between the input shaft and the output shaft of a stepless variable transmission device; and which is installed with the clutch device 212 with angular displacement difference and/or the clutch device 222 for eliminating the vibration produced by the hetero-shaft type stepless variable transmission device 100 and the low gear transmission wheel group 102, the both do not operate with fully same speed ratio, for overloaded transmission. |
| 主权项 |
1. A stepless variable transmission with a parallel low gear wheel group, comprising:
a hetero-shaft stepless variable transmission device (100) having an input shaft (101) coupled to a variable transmission moving wheel and an output shaft (103) coupled to a variable transmission passive wheel via a clutch device (222) installed between the variable transmission device passive wheel and the output shaft (103); a low gear transmission wheel group (102) having a low gear transmission moving wheel and a low gear transmission passive wheel, wherein the low gear transmission wheel group (102) includes at least one of: (i) a chain and sprockets; (ii) gears or friction wheels, including the low gear transmission moving wheel, the low gear transmission passive wheel, and/or an intermediate wheel; (iii) an inner gear group or inner friction wheel group, which are constituted by a driving wheel with a smaller outer diameter and an inward driving wheel with bigger outer diameter; and a one-way transmission unit (111) installed in one of the following positions: (a) between the input shaft (101) and the low gear transmission moving wheel, and (b) between the low gear transmission passive wheel and the output shaft (103), wherein the input shaft (101) transmits input rotary kinetic energy to the variable transmission moving wheel, and to an input of the one-way transmission unit (111), wherein the output shaft (103) transmits rotary kinetic energy from the variable transmission passive wheel, or from the low gear transmission passive wheel, to a load, wherein when the rotational speed of the input shaft (101) is higher than that of the low gear transmission moving wheel in a same rotary direction, then the input shaft (101) transmits the input rotary kinetic energy via the one-way transmission unit (111) to the low gear transmission moving wheel, and when the rotational speed of the input shaft (101) is not higher than that of the low gear transmission wheel in the same rotary direction, then the input rotary kinetic energy is prevented from being transmitted from the input shaft (101) to the low gear transmission moving wheel, and wherein speed ratio relationships between the low gear transmission wheel group (102) and the hetero-shaft stepless variable transmission device (100) are arranged as follows: (i) a speed ratio at which the low gear transmission moving wheel drives the low gear transmission passive wheel ≦ a speed ratio of the hetero-shaft stepless variable transmission device (100) for a first output speed; or (ii) the speed ratio of the hetero-shaft stepless variable transmission device (100) for the first output speed < the speed ratio at which the low gear transmission moving wheel drives the low gear transmission passive wheel < a speed ratio of the hetero-shaft stepless variable transmission device (100) for a second output speed that is higher than said first output speed, and wherein when the output shaft (103) is overloaded, the reduction ratio of the hetero-shaft stepless variable transmission device (100) increases to near a speed ratio of the low gear transmission wheel group (102), at which time the clutch device (222) is disconnected to cut off kinetic energy transmission from the variable transmission device passive wheel to the output shaft (103) so as to eliminate vibration due to a speed ratio difference between the hetero-shaft stepless variable transmission device and (100) and the low gear transmission wheel group (102). |
