Italy production of Bignozzi motor, British Chamberlain company motor and Germany Jahns, pleige motor is a typical representative of low-speed high-torque hydraulic motor, they as the earliest low-speed high-torque hydraulic motor, with high working performance, relatively compact motor structure and cheap price, most of the world's motor products are their hydraulic motor. In addition, Japan has also made great progress in this regard, such as Kawasaki Co., Ltd., Sakihara Manufacturing, Shojo Kogyo Co., Ltd., etc. have also developed and produced a number of low-speed and high-torque hydraulic motors with excellent quality and performance.
On the basis of introducing and absorbing the advanced technology of low-speed and high-torque hydraulic motors abroad, China selectively selects the structural dimensions and structural materials of hydraulic motors, and domestic experts have studied in detail the friction pairs inside the structure of low-speed and high-torque hydraulic motors, and obtained the basic theory of these friction pairs, which provides a theoretical basis and basis for experimental research and optimization and improvement. Compared with foreign excellent hydraulic motor products, the stability and overall reliability of domestic low-speed and high-torque hydraulic motors running at high speed still have certain deficiencies, but great progress has been made, and some fruitful theoretical achievements have been achieved in the process of continuous research and optimization and improvement of hydraulic motors. Domestic hydraulic motors have developed rapidly in recent decades, and various performance has been continuously improved. For example, the hydraulic motors produced by Hanzhu Hydraulic Motor Co., Ltd. and Interm Company have a relatively large share in the domestic market.
In terms of crankshaft non-connecting radial plunger hydraulic motor, foreign hydraulic motors led by Italian Calzoni MR series and Japanese Shimadzu HT series have been put into mass production and formed, compared with China's domestic enterprises in the crankshaft without connecting rod radial plunger hydraulic motor research and production in recent years have also achieved significant results.
