Stepless speed changer

Abstract

The invention provides a stepless speed changer which solves the problems that when a traditional stepless speed changer is started, a power density lifting speed of a bucket wheel is low, and a working condition requiring a high output torque lifting speed can not be adapted. The stepless speed changer is characterized in that the stepless speed changer comprises an input end planetary gear set and an output end planetary gear set; a cavity planet carrier is arranged between the input end planetary gear set and the output end planetary gear set, and comprises a cavity input end cover and a cavity output end cover; a bucket wheel cavity housing is fixedly arranged between the cavity input end cover and the cavity output end cover; the inner side of the input end planetary gear set is connected with the cavity input end cover; the inner side of the output end planetary gear set is connected with the cavity output end cover; and a bucket wheel planetary gear set is arranged on one side of the interior of the bucket wheel cavity housing. The stepless speed changer can be widely applied in the field of transmission.

Description

technical field [0001] The invention relates to a mechanical transmission device, in particular to a continuously variable transmission. Background technique [0002] In the field of transmission, the transmission is the most widely used in the automotive field. At present, automobile transmissions are divided into manual transmission (MT), automatic transmission (AT) and manual automatic transmission according to the operation mode. With the rapid development of automobiles, automatic transmissions have gradually occupied the mainstream of automobiles due to their simple operation, and automatic transmission vehicles achieve the purpose of speed change through hydraulic transmission and gear combination. Automatic transmissions are further divided into hydraulic automatic transmissions (AT), electromechanical automatic transmissions (AMT) and continuously variable transmissions (CVT). Among them, the most widely used and most loaded components are hydraulic torque converte...

AI Technical Summary

Problems solved by technology

[0003] (1) The torque converter is a pump wheel whose power is connected through the casing. The pump wheel stirs the oil in the torque converter, drives the turbine to rotate through the guide wheel, and the turbine outputs power. The disadvantage is that when the torque converter When the speed difference between the pump wheel and the turbine is close to synchronization, the transmission ability will be lost and synchronization cannot be achieved; in order to improve the above problems existing in the hydraulic torque converter, when the control system is added, the system will be complicated and the manufacturing cost will be high.

[0004] (2) The existing continuously variable transmission (CVT) uses transmission friction and a driving belt with variable working diameter to transmit power, which can realize the continuous change of the transmission ratio, so as to obtain the working conditions of the transmission system and the engine. Its disadvantage is that it cannot provide flexible zero start, cannot provide large torque, and it is easy to slip when the force changes frequently.

[0005] (3) The existing domestic patent authorization number is CN 102606709 B patented hydraulic synchronous double speed device, the disadvantage of this hydraulic synchronous double speed device is that the balance force between the bucket wheel and the oil is limited, and it can only The maximum balance force of the bucket wheel is internally variable; when the output shaft needs to be greater than the torque that the maximum balance force of the oil and the bucket wheel can provide, the oil in the inner box needs to be emptied, and the gear mechanism involved in braking is a commonly used The structure of the planetary gear reducer does not have the function of flexible transmission; the whole control system belongs to the electronic control system, and the structure of the control, braking and other devices is complex

[0006] (4) The applicant has submitted a patent application for a continuously variable transmission with a patent acceptance number of 201710055648.2. The technical solution is that the bucket wheel planetary gear set is located on the side of the output end cover of the cavity. The disadvantage of this structure is : When the transmission system starts or accelerates and needs to quickly increase the output torque, the planetary gear set at the input end and the planetary gear set at the output end increase the torque through two times of diameter enlargement. The revolution speed of the planet carrier determines the rotation speed of the planetary wheel of the bucket wheel. The power density of the bucket wheel with this structure increases slowly, which is not suitable for the working conditions that need to quickly increase the output torque.

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