Selection and Fault Analysis of Hydraulic Motor

Products can be widely used in mining construction, engineering machinery, lifting transport equipment, heavy metallurgical machinery, oil and coal mining machinery, ship deck machinery, machine tools, plastic machinery, geological drilling equipment, and other mechanical hydraulic transmission system. Especially for the screw drive of the injection molding machine, to enhance the winch, the drive of the reel, a variety of rotary mechanism drive, track and wheel drive mechanism drive and other transmission machinery.

Structural principle
The  plunger cylinder of the pressure oil is subjected to the hydraulic  pressure to produce a thrust force P on the plunger body. The  thrust through the connecting rod in the center of the crankshaft, so  that the output shaft rotation, while the oil plate with the rotation,  when the plunger body position to reach the bottom dead center, the  plunger cylinder will be connected to the oil pan, The plunger is pushed up by the crankshaft. At this point, after the work of the hydraulic oil through the oil pan to return to the tank. Each  plunger body connected to the high and low pressure oil, the pillar of  the output shaft center of the drive torque generated by the same  direction, so that the motor output shaft to obtain a continuous and  smooth torque. When changing the direction of the oil flow, the direction of rotation of the motor can be changed. If the oil pan can be rotated 180 ° assembly can also achieve the motor reversal.

Several formulas used in the design
1, the actual output torque of the hydraulic motor: M = 0.159 (P1-P2) q • η m (N.m)
Where: P1, P2 --------- are the hydraulic motor inlet and outlet pressure (MPa)
Q -------------- Displacement of hydraulic motor (ml / r)
Ηm ------------ hydraulic motor mechanical efficiency
2 . Hydraulic motor output power

Where: n ----------------- Hydraulic motor speed (r / min)
Q ------------------ Enter the flow rate of the hydraulic motor (ml / min)
Ηv -------------- Hydraulic motor volumetric efficiency
3. Hydraulic motor speed:

Model identification instructions

1, motor model / Model
2, series / series
3, nominal displacement / Displacement (ml / r)
4, the output shaft form / Output shaft
1). No letter indicates the standard rectangular spline shaft (centered with centering)
2) .B for the flat key; the footnote indicates the same  size as the BM type cycloid hydraulic motor or other brand (with  transition flange plate)
3) .D installation connection size and Kunshan Hydraulic Factory 1JMD with the same displacement hydraulic motor
4) .The internal spline (with inner diameter  centering); footnote digital and Ningbo hydraulic motor factory  production QJM series installation the same size (with transition flange  plate)
5) .GM, SL said installation connection size and Italy SAI  company production M series, L series, GM series hydraulic motor the  same, footnote number that different types of installation size
5, oil pan and access port thread / Distributors an I / O port thread