Toroidal CVT

Abstract

The invention relates to a toroidal stepless speed changing system. The system consists of a toroidal stepless speed changing device and a toroidal stepless speed changing control system; the toroidal stepless changing change device consists of an input shaft (11), a left input wheel disc (12), a right input wheel disc (17), a left output wheel disc (14), a right output wheel disc (16), intermediate roller mechanisms (13), an active output gear (15), a passive output gear (18) and an output shaft (19); the four groups of intermediate roller mechanisms are used for synchronously and continuously changing an operating angle to make the effective working radius of the input wheel discs and the output wheel discs continuously changed and achieve the purpose of smoothly and steplessly changing the transmission ratio; and an electric controller of the toroidal stepless speed changing control system is used for determining the optimal transmission ratio according to an input driver instruction and the state of the system and enabling an actuator to realize the transmission ratio once the optimal transmission ratio is determined. The system is applied to similar power speed changing box systems requiring stepless speed changing.

Description

technical field [0001] The invention relates to the mechanical structure and control of a continuously variable transmission system, and belongs to the field of power machinery technology and automobile manufacturing. Background technique [0002] The infinitely variable mechanical continuously variable transmission, referred to as IVT, was first developed and patented by the British Torotrak company, but the industry has always regarded it as a CVT until the SAE (Society of Automotive Engineers) annual meeting held in Detroit, USA in March 2003 be classified separately. [0003] Japan's NSK and other companies have developed an automatic transmission device called Half Toroidal CVT on the basis of the above principles. Its typical structure is as follows: figure 1 shown. [0004] figure 1 The middle discs (3), (5), (7), (8) have toroidal working surfaces. The input discs (3) and (8) are splined on shaft 1 and rotate with the input shaft. The output wheels (5) and (7) a...

AI Technical Summary

Problems solved by technology

In order to ensure the reliability of the work, it is designed for the safe axial thrust in the most dangerous working state, and it is bound to produce more than the required axial thrust in other working states, resulting in excessive loads on parts and more reactive power consumption;

[0010] 2. In order to transmit the axial thrust to the working surfaces of all toroidal discs (3), (5), (7), and (8), the attitude angle rotation axis of the intermediate roller mechanism (perpendicular to the drawing) should be Floating, which will increase the complexity of the structural design

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