Stepless automatic speed change device

Abstract

The invention discloses a stepless automatic speed change device. The device comprises a planetary gear set, a variable-speed chain mechanism, a power input shaft and a power output shaft, wherein oneof a ring gear or a sun gear or a planet carrier of the planetary gear set is a planetary gear input end, another one is the planetary gear output end, and the rest is the planetary gear speed regulating end, wherein the planetary gear input end is in power connection with the power input shaft, and the planetary gear output end is in power connection with the power output shaft; the variable-speed chain mechanism comprises a driving wheel set and a driven wheel set, wherein the driven wheel set is in power connection with the planetary gear speed regulating end, and the driving wheel set isin power connection with the power input shaft or the power output shaft or the planetary gear input end or the planetary gear output end; and the power can be continuously transmitted in a variablemode, free changing of the forward gear, the reverse gear and the neutral gear can be stably realized without depending on a clutch, the power can be reliably transmitted in a stable mode when a relatively large load is borne, the output torque of the lowest gear of a vehicle is increased, so that the heavy load starting and gradeability of the vehicle are improved.

Description

technical field [0001] The invention provides a continuously variable automatic transmission device. Background technique [0002] Automobile transmissions are divided into manual transmissions and automatic transmissions. Manual transmissions achieve different gear ratios by changing gears as needed by the driver, which is inconvenient to operate. With the maturity of automatic transmission technology, it has gradually become the standard configuration of family cars. But for now, most of the automatic transmissions are still gear-engaging transmissions. In order to reduce the sense of frustration that the automatic transmission produces, the number of gears in the automatic transmission is usually increased to make the shift smooth, but the increase in the number of gears also increases the number of gears and planets. The number of gears leads to a larger volume and increased weight of the automatic transmission, thereby increasing fuel consumption; there is also a CVT (C...

AI Technical Summary

Problems solved by technology

[0002] Automobile transmissions are divided into manual transmissions and automatic transmissions. Manual transmissions achieve different gear ratios by changing gears as needed by the driver, which is inconvenient to operate. With the maturity of automatic transmission technology, it has gradually become the standard configuration of family cars. But for now, most of the automatic transmissions are still gear-engaging transmissions. In order to reduce the sense of frustration that the automatic transmission produces, the number of gears in the automatic transmission is usually increased to make the shift smooth, but the increase in the number of gears also increases the number of gears and planets. The number of gears leads to a larger volume and increased weight of the automatic transmission, thereby increasing fuel consumption; there is also a CVT (Continuously Variable Transmission) automatic transmission that adopts the continuous transmission technology of the variable chain mechanism, and its structure mainly includes driving wheels, driven wheels The basic components such as group, transmission belt, variable speed controller (TCU) and hydraulic pump, the driving wheel in the driving wheel group and the driven wheel in the driven wheel group are composed of a movable disc and a fixed disc with a conical surface structure, and the movable disc The V-shaped groove is formed opposite to the tapered surface of the fixed disk to cooperate with the V-shaped transmission belt. Since the movable disk can slide on the corresponding axle under the drive of the hydraulic pump assembly, it can change the driving wheel and / or the driven wheel. The distance between the movable disc and the fixed disc can continuously change the meshing diameter at both ends of the transmission belt to realize stepless transmission. The advantages of this automatic transmission are light weight, small size, few parts, high operating efficiency and low fuel consumption. The disadvantage is that the transmission belt will slip when it bears a large load. It can only be applied to cars with small displacement, low power and low torque. This type of automatic transmission has a low occupancy rate.

[0003] Whether it is a manual transmission or an automatic transmission, it is necessary to rely on the clutch in the process of switching forward gear, reverse gear, and neutral gear, especially the clutch structure in the automatic transmission is more complicated, which not only increases the cost of the vehicle but also increases the weight and weight of the vehicle. volume; and the highest deceleration ratio of the lowest gear (I gear) of most transmissions is 5:1, which limits the maximum output torque of the vehicle and affects the vehicle's heavy-load starting and climbing capabilities

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