On April 5, 2025, financial news stated that Jinan Hydraulic Pump Co., Ltd. obtained a patent for "A Sealing Structure of Bimetallic Side Plate for High - Pressure Gear Pumps" (authorization announcement number CN 222717063 U), with an application date of July 2024. The "8" - shaped side plate has through - holes on both sides of the center, and there are low - pressure unloading grooves, high - pressure unloading grooves, and high - pressure area oil - guiding grooves on its front. On the back of the side plate, there is a "3" - shaped back - pressure groove with ear - shaped baffles and seals. This design can avoid the formation of vortices in hydraulic oil due to low structural matching, thus improving the service life of the gear pump. The simple - structured "3" - shaped back - pressure groove is easy to process, with low cost and high production efficiency.