The Research Of 24v On-board Power Tools

24V vehicle electric wrench is mainly applied to dismantle tire of heavy transport vehicles. Tire is broken down on the way while vehicle is travelling far away from vehicle servicing station, in such a case, there are no Professional maintenance equipment and maintenance technician, so the drives must be accomplished the whole process of dismantling and fixing tire by themselves. Previous electric, pneumatic wrench are not inconvenient to carry because of large weight and huge volume ,furthermore, they demand high energy source in accord with the high efficiency, but vehicles on the way only carry vehicle battery with low power. so, previous electric, pneumatic wrench are only used in the workshop. Therefore, it is very necessary to design a small, lightweight and easily-carry electric wrench supplied by the vehicle battery. The traditional torque motor collocation planetary reducer scheme can no longer meet the requirements due to the limit of the vehicle battery's output power. Thus this paper puts forward a impact mechanism scheme of energy storage, designs a mechanical structure whose score is storage flywheel and impact mechanism, adopt the finite element analysis on the key part as well as the evaluation of its stiffness and local strength.The paper implements 3d entity modeling scheme on 24V vehicle electric impact wrench Using the virtual prototype technology, simulate the working condition of the electromotive spanner by establishing a dynamic simulation model to verify the output torque of electric impact wrench. Then it analyses the impact mechanism of working progress based on the results of the simulation, optimize the design of the impact mechanism to improve the reliability of the impact mechanism. Finally, this paper designs the detection device and experimental platform for validating the output torque by of the electric impact wrench by using the existing equipment of the laboratory. The purpose of measuring the output torque indirectly achieved by measuring the speed of the energy flywheel and the result is satisfied.Finally, the paper verifies the theory of electric vehicle 24V impact wrench and the correctness of the structural design by comparing the following three parts, the analysis on the mathematical model of the impact mechanism, simulating the impact mechanism of virtual prototype model, experiment of the physical prototype, which lays a good foundation for engineering application.