The structure of the inclined shaft axial piston pump is different from that of the swashplate axial piston pump, so its stress is not completely the same. The plunger of the inclined disc axial piston pump is subjected to a large radial force, which will cause wear between the cylinder block and the plunger. In order to reduce wear, the swashplate tilt angle of swashplate axial piston pump generally does not exceed 20 °. The radial force between the plunger and the cylinder body of the oblique axial piston pump consists of two parts: in order to drive the cylinder body to overcome friction, the tangential force transmitted by the plunger to the cylinder cavity (only the driving plunger has this force); Second, Bmr cycloidal hydraulic motor Since there is an included angle between the axis of the plunger and the axis of the cylinder cavity, the liquid pressure produces a radial component force F '=(x/4) d2ptana. Assuming that the driving plunger is in the high-pressure area, the two forces exist at the same time, and the positive pressure of the plunger on the cylinder block is the combined force of the two forces. In order to reduce the hydraulic radial component, it is necessary to reduce a. The half cone angle a of the plunger, generally a=2 °~4 °, so F 'is not large, and the friction torque that the cylinder block needs to overcome is not large, so the radial force between the plunger and the cylinder cavity of the swashplate pump is much smaller than that of the swashplate pump.

The transmission shaft flange of the inclined disc axial piston pump plays the role of the inclined disc of the inclined disc axial piston pump. Considering the inclination angle a between the plunger and the cylinder cavity, sa=2 °~4 °, it can be approximately considered that BMT series Cycloid hydraulic motor The force exerted by the plunger ball head on the transmission shaft flange is parallel to the cylinder block axis. Therefore, the grip on the drive shaft flange is the same as on the swashplate pump. Small cycloidal hydraulic motor The transmission shaft flange plate, which is different from the swashplate axial piston pump, must rotate around its own axis. In this way, the axial resultant force of the plunger force on the flange is borne by the tapered roller bearing on the drive shaft, F=z (x/4) d2pcosy. In the formula, z 'is the number of plungers in the high-pressure zone. When the even plunger is z '=z/2, the odd plunger is z ± 1)/2. When calculating the thrust bearing on the drive shaft, z '=(z+1)/2 is used for safety. On the drive shaft, each plunger pair The acting force of flange plate is F,=z '(x/4) d2psiny. The radial force of the drive shaft is also borne by the tapered roller bearing on the drive shaft.