A hydraulic automatic flow-selection transmission system

Abstract

The invention provides a hydraulic automatic flow selecting speed changing system. A plurality of gear trains different in transmission ratio are arranged between an input mechanism and an output mechanism of the speed changing system, and each gear train enables the input mechanism to be connected with the output mechanism through a coaxial device. The speed changing system further comprises a plurality of stages of hydraulic flow selecting devices and a plurality of hydraulic shifting fork controllers, the multiple stages of the hydraulic flow selecting devices are connected in series and enable hydraulic oil different in pressure to enter the different hydraulic shifting fork controllers according to the magnitude of pressure of an inlet, and the multiple hydraulic shifting fork controllers control the coaxial devices to be combined or separated according to the pressure of the inlet and are used for changing the rotation speed of the output mechanism. Through the hydraulic automatic flow selecting speed changing system, according to differences of the input pressures of the hydraulic oil, it can be achieved that the hydraulic oil different in pressure flows out from different outlets, accordingly, the different hydraulic shifting fork controllers are controlled, and the variable speed of a speed changer under different oil pressures is controlled.

Description

technical field [0001] The invention relates to the field of transmission systems, in particular to a hydraulic automatic flow-selection transmission system. Background technique [0002] The traditional hydraulic automatic transmission automatically shifts gears according to changes in the vehicle's driving speed and throttle opening. Its shift control method is to convert the vehicle speed and throttle opening signal into control oil pressure through mechanical means, and add the oil pressure to both ends of the shift valve to control the position of the shift valve, thereby changing the shift execution. Oil circuits for components (clutches and brakes). In this way, the working hydraulic oil enters the corresponding actuators to make the clutch engage or disengage, the brake brake or release, and control the upshift or downshift of the planetary gear transmission, thereby realizing automatic shifting. [0003] The core control device of an automatic transmission is a hy...

AI Technical Summary

Problems solved by technology

[0004] The current hydraulic automatic transmissions on the market are complicated in structure and high in cost, and are not suitable for occasions with simple transmission requirements

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