Ship radial ball plug type produced by Ningbo White Hydraulic Technology Co., Ltd Inner curve hydraulic motor It has the advantages of wide range of speed change, high efficiency, small size, light weight, etc., and has been widely used.

1. Basic principles

Inner curve motor Principle. The inner surface of the stator is composed of several surfaces with identical shapes. Each surface is composed of operation section and oil return section. There are many distributed piston holes in the center angle of the rotor body, and the bottom end of each hole is provided with an oil inlet, which is interconnected with the corresponding port port of the port shaft. When the piston enters the running section of the stator surface, the pressure oil enters the piston through the oil inlet of the distribution shaft to the piston opening of the rotor body to press the steel ball on the running section of the stator surface. The stator surface forms a reaction force N on the steel ball, and the radial component F of the reaction force N is balanced with the hydraulic force, while the tangential component F is transmitted to the rotor body to form a torque that makes the cylinder rotate. When the piston enters the oil return section of the stator surface, the through oil inlet of the piston is interconnected with the return oil inlet of the port shaft. At this time, the stator surface presses the piston back to drain the hydraulic oil through the port shaft. The piston moves repeatedly every time it passes through a curved surface. When the inlet and outlet of the port shaft are reversed, the motor will reverse.

2. Structural characteristics and service performance

The radial ball plug type internal curve night pressure motor adopts the commercially purchased standard part - steel ball as the key force transmission component of the plunger pair, so it is simple in structure, convenient in production, and has excellent shock resistance performance.

The piston is a stepped outer circle structure, and the ball socket at the big round end of the piston is bonded with a ball pad for composite material production. The steel ball is installed in the ball socket. Static pressure support structure is adopted between the steel ball and the ball socket. The bottom end of the ball socket is a hydrostatic oil chamber. The cylinder liner for composite material production is bonded in the piston hole of the rotor body. The hydrostatic support structure is also adopted between the piston hole and the big round end of the piston. The pressure oil enters the hydrostatic support through the damping passage on the damping plug. book Hydraulic motor Its mechanical efficiency can reach more than 95%.

The small round end of the piston is a reasonable acting end. The small round end of the piston is equipped with a plastic piston ring containing copper powder. The small round end of the piston and the cylinder hole have good sealing performance and long service life.

The curved surface of the stator guide rail is produced into an arc shaped groove that is very close to the steel ball. The steel ball is turned over along the channel, ensuring a very large total contact area on the contact parts between the steel ball and the channel, and reasonably reducing the contact pressure. The structural feature makes the hydraulic motor manufactured by machining. The additional contact angle caused by installation deviation, overall assembly, compression deformation and other reasons is small, so the operation is safe and reliable.

4. Application

Radial ball plug type internal curve hydraulic motor has been widely used, and 1QJM motor has been applied to 589kN hydraulic ship windlass of large and medium-sized landing ships. 2QJM motors are also applied to 294kN and 157kN hydraulic windlass cleaning machines on medium and mini landing ships respectively. The 2QJM-E1.6 motor is installed on the 49kN hydraulic boat windlass and has passed the military inspection of the relevant naval department. In addition, 2QJM-E25 and 2QJM-E6.3 motors have passed the type inspection and have been evaluated by the shipping group company at the ministerial level. The motor is also used in other special equipment of ships. For example, 2QJM-E6.3 shell rotation: the motor was successfully assembled on the 918 mine laying ship transportation and mine laying system.