Step transition continuously variable transmission scheme

Abstract

The invention discloses a stepless speed changing transmission scheme. According to the scheme, a metal belt type stepless speed changing unit, a forward gear and reverse gear planetary gear mechanism, a range shift planetary gear mechanism and a transition gear mechanism between an input shaft and an output shaft of a speed changer are mainly included. Two transmission routes are placed between the input shaft and the output shaft of the speed changer, one route is a serial-connecting route of the stepless speed changing unit and the range shift mechanism, and the other route a transition gear transmission route. The second route only has a transient effect. Before range shift mechanism gear shifting, the transmission ratios of the two routes are the same, and transition from the stepless speed changing unit route to the transition gear route is carried out. After the transition is completed, the transmission ratio of the stepless speed changer is changed, the transmission ratios of the two routes are the same again, transition from the transition gear route to the stepless speed changing unit route is carried out, and after the transition is completed, the stepless speed changing unit transmission ratio can be changed. So far, gear shifting is completed. During the gear shifting process, the two routes have simultaneous transmission moment, power interrupting does not exist, clutch and brake driving and driven friction pieces have no relative rotating, impact does not exist, and the overall gear ratio of the speed changer is expanded.

Description

technical field [0001] The invention relates to a transmission layout scheme of a continuously variable transmission, which is applicable to various continuously variable transmission units with different transmission principles (the metal belt type continuously variable transmission unit is taken as an example in this specification), and is a transmission that can A continuously variable transmission that expands the gear ratio through a simple gear set and clutch. Background technique [0002] At present, most of the continuously variable transmissions on the market are metal belt type continuously variable transmissions, and a few use swing pin chain type continuously variable transmissions. Although their technologies are relatively mature, there are also a series of common problems. For example, low load torque, skewed drive belts, starting problems, etc. The above two kinds of transmissions are friction transmissions, and the carrying capacity is limited by the frict...

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Problems solved by technology

[0003] In order to overcome the problem of relatively small gear ratio and bearing torque, the present invention provides a solution, which realizes the perfect matching between the continuously variable transmission unit and the stepped auxiliary transmission, and ensures that the overall transmission ratio of the transmission does not change before and after the auxiliary transmission is shifted. , and there is no power interruption during the shifting process, realizing a completely "loophole" shifting

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