Tractor multi-section automatic stepless transmission

Abstract

The invention relates to a tractor multi-section automatic stepless transmission. The tractor multi-section automatic stepless transmission is mainly composed of a power input gear, a differential planet row, a CVT pump, a CVT motor, a reverse gear clutch, a dual-clutch clutch, a synchronizer and a PTO input shaft, wherein the dual-clutch clutch comprises an odd-gear clutch and an even-gear clutch. According to the tractor multi-section automatic stepless transmission, the dual power flow combining technology of a compound differential planet row with two degrees of freedom is combined with the stepless speed adjusting characteristic of the CVT pump and the CVT motor and is also fused with the dual-clutch multi-section type power gearshifting transmission technology, so that steady gearshifting of a drive system without a pausing sense is realized, and non-intermittent stepless speed change from zero to the highest rotating speed is realized.

Description

technical field [0001] The invention belongs to the field of tractors and relates to a tractor multi-stage automatic continuously variable transmission. Background technique [0002] The continuously variable transmission system has the characteristics of continuous transmission speed ratio, stable power transmission, strong adaptability, and can provide the engine to work at the best economic point or the best power point under any conditions. It is especially suitable for occasions where the speed is precisely controlled, where ultra-low speed is required, where the load of the tractor changes frequently, and where high comfort and economy are required. Its fuel economy, power, comfort and emission performance are good. It can adapt to the tractor to work in various occasions, and can realize various functions required by precision agriculture. It has advantages that other transmission systems cannot match, and represents the technical development direction of high-end tra...

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Problems solved by technology

[0003] Patent Publication No.: EP1541898A2 discloses a CVT transmission for vehicles, especially agricultural tractors. The shifting structure of this patent is composed of three synchronizers and two clutches to form four forward stages and two reverse stages. The disadvantage is that the axial distance is long , the stiffness of the shaft is poor; the two clutches are located behind the synchronizer, the disadvantage is that the clutches must bear both the high torque at low gear and the high speed at high gear

[0004] Patent application publication number: CN110145571A discloses a hybrid transmission without power interruption, the input shaft includes a first input shaft and a second input shaft, the second input shaft is a hollow shaft sleeved on the first input shaft and the The first input shaft and the second input shaft can rotate independently of each other. The clutch structure is an inner and outer clutch, with a complex structure and no reverse gear

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