Mechanical and hydraulic combined transmission device

Abstract

The invention relates to a mechanical and hydraulic compound transmission device which comprises an engine, a speed changer, a planetary gear box, a hydraulic variable pump, a hydraulic motor and a reduction gearbox; the engine is sequentially connected with the transmission speed changer and the planetary gear box, and a planetary gear mechanism of the planetary gear box distributes the power driven by the motor to respectively drive the hydraulic variable pump and a center gear; the hydraulic variable pump is sequentially connected with a transmission hydraulic motor and a half shaft, the half shaft converges mechanical power flow driven by the center gear and hydraulic power flow driven by the hydraulic motor and protrudes outside the planetary gear box to output the power, and a transmission gear box is connected with the half shaft to redrive a rear shaft to drive a vehicle. A special vehicle refit by the technology with a single-engine configuration can run at a stepless variable speed in a mechanical and hydraulic compound transmission mode, meanwhile, the vehicle can drive a vehicle-mounted operating device in the mechanical transmission mode; during transition, the mechanical transmission mode can be adopted to cause the device to run quickly, the power system occupies little vehicle space, and has low emission, high transmission efficiency and low oil consumption.

Description

technical field [0001] The invention relates to a transmission device, in particular to a mechanical and hydraulic compound transmission device. Background technique [0002] Many engineering operations need to use the chassis of the car to carry the operating equipment while driving and perform various construction operations, such as road sweepers and harvesters. The power transmission of some of the operating devices is realized by an engine through a mechanical transfer case to simultaneously drive the vehicle and the operating device to work, such as the transmission device of the harvester. However, because road sweepers and the like need to constantly change the driving speed during driving, and the engine speed is changed when the speed is changed, the work quality will be reduced, so the road sweepers and other operating devices cannot use this power transmission method. [0003] At present, there are two solutions for the power transmission of a road sweeper opera...

AI Technical Summary

Problems solved by technology

The shortcomings of this hydraulic-mechanical compound transmission scheme are: (1) the first stage is hydraulic transmission, and its transmission efficiency is low; (2) there is circulating power in the power flow direction of the second stage; (3) the hydraulic power in the third stage The ratio of power flow and mechanical power flow is constantly changing, and the total transmission efficiency after confluence is unstable; (4) The operation method is complicated and difficult to master, which is not common to the general operation essentials of ordinary cars, and it is easy for the driver to make operation errors and cause safety accidents

"Application of Hydraulic Coupling and Energy-saving Technology" (edited by Liu Yingcheng and Yang Naiqiao, published by Chemical Industry Press, first edition in January 2006) published the selection of transmission mode of speed-regulating hydraulic coupling (Chapter 6, Section 7, Section 3, Table 6-8), among the various speed-regulating transmission methods listed in this table, the transmission efficiency of the single-motor series-connected speed-regulating fluid coupling is low, the power of the hydraulic coupling is large, and multiple motors are connected in series or parallel The structure of the speed-regulating hydraulic coupling mechanism is complex and the investment is large

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