The automobile transmission gear is one of the transmission modes used in machine transmission and it is widely used because of its high effect and stable transmission. In this paper, aimed at an automobile transmission gear, the composition and working principle of the reducer are introduced in detail. Considering that the contact stress has a great effect on the gear transmission of the reducer, exploring the dynamic and static contact stress of the involute spur gear has a crucial effect on improving the life and contact strength of the gear. Parametric modeling of the reducer gear is completed using 3D modeling soft SolidWorks, then the 3D solid model of the reducer gear is imported into ANSYS, and the modal analysis of the gear reducer is performed to obtain the gear. To simplify the computation process, a three-tooth model is established, and contact stress analysis is fulfilled. The results of the analysis provide a certain reference value for the design and manufacture of automotive reducer gears.
This paper designs an automatic obstacle avoidance tracing vehicle control system based on single chip computer. Based on STC89C52 single chip computer as control core, this paper detects the preset tracing guide line with infrared photoelectric sensor and feeds back the detection signal to single chip computer. The single chip computer will analyze and judge the acquired information and control L293D chip will drive DC motor for the control of left and right wheel rotation speed and adjustment of vehicle rotation direction so that the vehicle can automatically drive along the preset tracing and achieve the automatic tracing function. The operator uses HC-SR04 ultrasonic sensor to achieve obstacle avoidance and distance measurement function. The display module and alarm module equipped is able to have real time acquisition, display and control of the vehicle operation status and parameters. It designs and debugs the hardware circuit and designs the control software program. The vehicle is able to realize automatic tracing, obstacle avoidance and distance measurement function through physical test. It can run stably and reliably. The system circuit of simple structure and easy operation is applicable to unmanned factory, logistics, scientific exploration and other fields, which is of strong practicability and promotion value.
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