Low speed motor The basic type of is radial plunger type, such as single acting connecting rod plastic, static pressure balance type and multi acting internal curve type

Constant low speed structure. The main characteristics of low-speed motor are large displacement, large volume and good low-speed stability (generally 10

Stable operation below T/min, and some can be as low as 0.5z/min), so it can be directly connected to the working mechanism, without the need

The reducer greatly simplifies the transmission mechanism. Generally, the output torque of low-speed motor is large (up to thousands of N. m to tens of thousands

N . m) , so it is also called Low speed high torque motor 。

1、 Connecting rod type Radial plunger motor

（1） Introduction to working principle and structure

Figure 11-8 shows the connecting rod type radial piston motor Structure schematic diagram of. Radially and evenly arranged around the circumference of shell 1

Five (or seven) cylinders. The plunger 2 in the cylinder is connected to the connecting rod 3 through a ball joint. The cylindrical surface of the connecting rod end and the crankshaft 4

The center pulley (the center of the eccentric is 0I, which is in contact with the crankshaft rotation center. The eccentricity 001=e). One end of the crankshaft

It is connected to the port shaft 5 through a cross joint. The two sides of the "partition wall" on the distribution shaft are oil inlet cavity and oil discharge cavity respectively.

After the high-pressure oil enters the oil inlet chamber of the motor, it is led to the corresponding plunger cylinders ①, ② and ③ through the slots ①, ② and ③ of the housing

Go. The hydraulic pressure generated by the high-pressure oil acts on the top of the plunger and is transmitted to the eccentric wheel of the crankshaft through the connecting rod. For example, plunger cylinder

② The force acting on the eccentric is Fw. The direction of this force is along the centerline of the connecting rod and points to the center 01 of the eccentric. do

The force FN can be divided into two forces: the normal force Fs (the action line of the force coincides with the connecting line 001) and the tangential force Fr

Tangential force Fr produces torque to the rotation center 0 of the crankshaft, making the crankshaft around the center. Turn clockwise.

Plunger cylinders ① and ③ are also similar, but their positions relative to the main shaft are different, so the torque generated

It is different from red ②. The total torque that makes the crankshaft rotate is equal to the plunger siphon (①, ② and

③ ).