12-gear full-helical-tooth double-intermediate-shaft all-synchronizer gearbox

Abstract

The invention relates to a 12-gear full-helical-tooth double-intermediate-shaft all-synchronizer gearbox which adopts a design of combination of a three-section closed structure shell and main and auxiliary gearboxes. The main gearbox is of a small-center-distance double-intermediate-shaft structure and gears adopt large-tooth wide helical teeth, so that the bearing capacities and the meshing stabilities of the gears are improved, the meshing noise is reduced and the bearing cavity of the main gearbox is improved. Due to the adoption of an input drop-and-insert structure, the gear speed ratio order difference is small and the fuel economy is high. Double-cone inertial type of synchronizers are respectively and additionally arranged at an inverted first gear and second and third gears, so that the friction moments of the synchronizers are increased, the gear shifting force is reduced and the impact and noise which are generated in the gear shifting process are reduced. Due to the adoption of a helical tooth planet gear system structure, the bearing capacities of the gears are improved; and a planet gear system is designed with the axial limit, so that the helical tooth axial force is offset inside. Due to the adoption of an installing form of an auxiliary gearbox synchronizer, the torque states of a planet carrier at the high and low gears in a certain range are optimized and the torsional strength of a planet carrier assembly is greatly improved. By the double-support design of both the front and rear ends of the planet carrier, the influence of finished automobile factors on the normal work of the inside of the gearbox is reduced.

Description

technical field [0001] The invention relates to a 12-speed full-helical double countershaft full-synchronizer gearbox. Background technique [0002] In the common heavy-duty truck gearbox structure with double countershaft structure, it is necessary to align the teeth of the two countershaft gears to ensure the consistency of the two countershaft assemblies. , the noise is large; the main box generally adopts the meshing sleeve to shift gears. When shifting from one gear to another, since the meshing line speeds of the pair of gears or the meshing sleeves to be meshed during the gear shift are not equal, When the gear is impacted, it will cause noise and even damage the gear teeth, resulting in early wear and tear, and the driver needs a large shifting force during operation, which is easy to cause fatigue. [0003] In view of the above-mentioned problems in the heavy-duty truck gearbox with double countershaft structure, it is necessary to take measures in the gearbox stru...

AI Technical Summary

Problems solved by technology

[0002] In the common heavy-duty truck gearbox structure with double countershaft structure, it is necessary to align the teeth of the two countershaft gears to ensure the consistency of the two countershaft assemblies. , the noise is large; the main box generally adopts the meshing sleeve to shift gears. When shifting from one gear to another, since the meshing line speeds of the pair of gears or the meshing sleeves to be meshed during the gear shift are not equal, The impact occurs during the operation, causing noise, and even damage to the gear teeth, resulting in early wear and tear, and the driver needs a large shifting force during operation, which is easy to cause fatigue

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