Electric commercial vehicle rear auxiliary box gear shifting executing mechanism

Abstract

According to the electric commercial vehicle rear auxiliary box gear shifting executing mechanism, a direct-current brushless motor drives a lead screw to rotate, a lead screw nut drives a gear shifting fork shaft to transversely move, a lever structure drives a gear shifting fork, and therefore a high-gear and low-gear sliding sleeve is driven to move towards a high-gear conical hub or a low-gear conical hub; the high-gear synchronizing ring and the low-gear synchronizing ring are circumferentially bounced off by a certain angle under the action of elastic force of a spring, and gear teeth are always staggered by half of teeth, so that when the synchronizing ring on one side is meshed with the gear teeth of the high-low-gear sliding sleeve, the conical surface of the gear teeth of the synchronizing ring on the other side is opposite to the conical surface of the gear teeth of the high-low-gear sliding sleeve. The gear shifting device has the advantages of increasing gear shifting force, being simple and efficient and being accurate and rapid in gear shifting.

Description

technical field [0001] The present invention relates to the technical field of vehicle gear shifting, and more particularly, the present invention relates to a rear auxiliary box gear shifting actuator of an electric commercial vehicle. Background technique [0002] Heavy commercial vehicles usually use 12-speed or 16-speed gearboxes. In order to reduce the axial size of multi-speed gearboxes, the main box and auxiliary box are usually combined. In the rear auxiliary box, the sun gear, planetary gear and planet carrier are generally included. And mechanical components such as ring gear, traditional rear auxiliary box shift execution components some use wet brakes, and some use traditional structure synchronizers, both of which are large in size, which increases the volume of the rear auxiliary box. [0003] In the traditional rear auxiliary box planetary gear mechanism, when the shift actuator is a wet brake, it is composed of a plurality of steel plate assemblies that are r...

AI Technical Summary

Problems solved by technology

[0003] In the traditional rear auxiliary case planetary gear mechanism, when the shift actuator is a wet brake, it is composed of multiple steel plate assemblies fixed relatively to the gearbox circumferential direction and multiple friction plate assemblies relatively fixed to the rotating parts circumferential direction. Occupies a large volume, which increases the volume of the gearbox. The wet brake needs to be replenished with oil, and a separate oil passage needs to be set, which increases the manufacturing cost.

[0004] When using a synchronizer with a traditional structure as the shifting actuator, because the structure of the traditional synchronizer is complicated, it will cause a certain shift loss, and the axial size of the traditional synchronizer is very large, which increases the axial size of the rear auxiliary box

[0005] At present, the driving forms of gear selection and shifting actuators are mainly divided into pneumatic, hydraulic, electric, etc. Although the pneumatic type has high shifting force, due to the compressibility of gas, the shifting process is not easy to control, the control process is rough, and requires High air tightness; the hydraulic type has good control precision, but it needs to set up oil circuit and oil pump device, if it leaks, it will easily cause pollution; and both the pneumatic type and the hydraulic type need to be equipped with external channels, which are costly and require gear shifting The impact is large, and the shifting is not precise enough; the electric type has higher transmission efficiency and more precise control, and can work with the vehicle power supply

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