Kinematics of motion of rotors of an orbital hydraulic machine

Abstract

There is no “rigid” kinematic connection between the centers of the rotors of the orbital hydraulic motor, which leads to non-standard changes in its output characteristics. A kinematic diagram of the movement of the rotors of an orbital hydraulic motor was developed, which made it possible to substantiate the kinematics of movement of its rotors and analyze the change in output characteristics. Abnormal changes in the output characteristics of this type of hydraulic motors are changes in the overall efficiency and changes in the angular speed of rotation of its shaft. When the gap between the rotors changes in the range of 0 to 0.4 mm, the overall efficiency of the positive displacement hydraulic machine decreases 3.6 times, which is explained by the increasing pour over between its rotors. The high value (0.92) and constancy of the volumetric efficiency of the orbital hydraulic motor is explained by the property of its rotors “self-sealing” in the process of moving, eliminating overflows. A decrease in the angular speed of rotation of the shaft of an orbital hydraulic motor 35 to 27 rad/s, with an increase in the gap of 0 to 0.4 mm, is explained by additional displacements of its inner rotor.

Determining the influence of geometric parameters of the traction-transportation vehicle's frame on its tractive capacity and energy indicators

“…and l 2 =0.97 m. The increase in l 1 to 2.09 m leads to an increase in the normal reactions on the TTV front wheels to N zk11 =N zk12 =2.87105 N and a decrease in the rear ones to N zk21 =N zk22 =1.35⋅10 5 N. The increase in l 2 to 1.17 m leads to a decrease in the normal reactions on TTV front wheels to N zk11 =N zk12 =2.60⋅10 5 N and an increase in the rear ones to N zk21 =N zk22 =1.51⋅10 5 N.…”

“…4). The increase in l 2 to 1.17 m leads to a decrease in the normal reactions on the TTV front wheels to N zk11 =N zk12 =2.60⋅10 5 N and an increase in the rear ones to N zk21 =N zk22 =1.51⋅10 5 N.…”

“…The kinematics of individual components of the system discussed in work [5] are not investigated taking into consideration the location of the centers of mass of elements and geometrical parameters of the frame.…”

“…Our review of the scientific literature [2][3][4][5][6][7][8][9][10][11] revealed that the influence of the geometrical parameters of the frame of vehicles on their tractive capacity and energy indicators for multielement (multi-mass) units remains unexplored. In addition, the geometrical parameters of the location of the TTV mass center on its dynamics are not investigated in detail.…”

“…We shall theoretically examine the influence of the geometrical parameters of the TTV frame on its tractive capacity and energy indicators using method (1) to (5). The dependence of tangent thrust forces on TTV Fig.…”