Low-speed large-capacity twin-turbine torque converter

Abstract

The invention relates to a low-speed large-capacity twin-turbine torque converter. The invention is characterized in that the transmission ratio i1 of a right shaft end gear to a gear of the stage I turbine output shaft is equal to 2.10-2.60, and the transmission ratio i2 of a right shaft end gear to a gear of the stage II turbine output shaft is equal to 0.80-0.98. The invention makes improvements on the flowing aspects: diameter of circulating circle, intermediate streamline inlet angle of pump blades, intermediate streamline outlet angle, thickness of inlet edge of intermediate ring surface, and thickness of outlet edge of intermediate ring surface; inlet angle and outlet angle of stage I turbine blades, radius of round head of inlet edge, and radius of round head of outlet edge; intermediate streamline inlet angle of stage II turbine blades, intermediate streamline outlet angle, thickness of inlet edge of intermediate ring surface, and thickness of outlet edge of intermediate ring surface; and inlet angle and outlet angle of guide blades, radius of round head of inlet edge, and radius of round head of outlet edge. The invention raises the productivity without lowering the speed of the entire car, lowers the traction force of the entire car and enhances the reliability of the transmission elements; the matching position of the pump impeller is reasonable, thereby obtaining favorable complete machine performance; and the invention has excellent dynamic performance and fuel economy.

Description

technical field [0001] The invention relates to a twin-turbine hydraulic torque converter applied to engineering machinery, in particular to a low-speed, large-capacity twin-turbine hydraulic torque converter applied to loaders. Background technique [0002] In recent years, with electronics and information technology as the forerunner, foreign construction machinery has carried out a lot of research on computer fault diagnosis and monitoring, precise positioning and operation, diesel engine fuel combustion control and ergonomics. Significant progress has been made in automatic control of fuel injection systems for diesel and diesel engines, automatic control of gear shifting in gearboxes, performance parameters and status monitoring. One of the important measures is to reduce the rated speed of the diesel engine so that it can work in a low fuel consumption area. These breakthroughs in research work have improved the performance, reliability, and productivity of loaders, r...

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Problems solved by technology

[0006] The Chinese patent has disclosed a utility model patent with the patent number 200920245535.X, which discloses a hydraulic torque converter for a low-speed diesel engine, wherein the diameter of the circulation circle of the hydraulic torque converter is 338-342mm, and the hydraulic torque converter When the cascade system of the torque converter is matched with the circulating circle diameter of 338-342mm, the matching position of the torque converter and the low-speed diesel engine will be very unreasonable

If the existing high-speed and small-capacity twin-turbine hydraulic torque converter is still used to match it, the load parabola of the pump wheel is far away from the rated speed of the diesel engine, such as Figure 8 As shown, the matching position is very unreasonable, and the overall performance of the loader will deteriorate, especially the power performance and fuel economy will be greatly reduced. Therefore, it is necessary to develop a low-speed large-capacity twin-turbo torque converter The diesel engine is matched. After matching, it can reduce fuel consumption by comparing with the output parameters of the high-speed and small-capacity twin-turbo torque converter. Figure 9 shown

However, due to the decrease of output speed, the productivity of the whole vehicle will decrease; at the same time, the output torque will increase, and the nominal torque of the stall condition is about 153N·m, which is about 30.9% higher than the original, and the increase of torque will increase the input to the gearbox The reliability of transmission components is reduced due to the load on transmission components such as intermediate drive shafts and drive axles

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