Triboelectric nanogenerators (TENGs) play an important role in harvesting mechanical energy from the environment. Most of their mechanical movements are reciprocating. And the mechanical energy always exists during the entire stroke, which involves the downward and ascending movements. To effectively harvest mechanical energy in the entire stroke, a bidirectional gear transmission triboelectric nanogenerator (BGT-TENG) is developed. The BGT-TENG comprises a platen, a bidirectional gear transmission system, a flywheel and shells. In a series of experiments, optimal setting parameters such as the flywheel mass and the size of the flexible fluorinated ethylene propylene (FEP) film were determined. When the BGT-TENG is acted upon by an external random excitation, reciprocating motion of the platen is transferred to a continuous operation of the flywheel through its bidirectional gear transmission. The BGT-TENG generates electric energy of 2.4 mJ under the low frequency bidirectional equi-spaced excitation of 3.5 Hz. Using a rectifying circuit, the BGT-TENG can power 375 light-emitting diodes, and a digital thermometer is powered successfuly. The results imply that the BGT-TENG has a wider application prospect in the field of energy harvesting.

摩擦电纳米发电机（TENGs）在从环境中收集机械能方面起着重要作用。它们的大部分机械运动都是往复运动。机械能始终存在于整个冲程中，涉及向下和上升运动。为了有效地在整个行程中收集机械能，开发了双向齿轮传动摩擦电纳米发电机（BGT-TENG）。BGT-TENG包括压盘，双向齿轮传动系统，飞轮和壳体。在一系列实验中，确定了最佳设置参数，例如飞轮质量和柔性氟化乙烯丙烯（FEP）膜的尺寸。当外部随机激励作用于BGT-TENG时，压盘的往复运动通过其双向齿轮传动传递给飞轮的连续运行。BGT-TENG在3.5 Hz的低频双向等距激励下产生2.4 mJ的电能。使用整流电路，BGT-TENG可以为375个发光二极管供电，并且数字温度计已成功供电。结果表明，BGT-TENG在能量采集领域具有广阔的应用前景。