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What role does the hydraulic gear pump play in the hydraulic system?


What role does the hydraulic gear pump play in the hydraulic system?
 
The heart of the hydraulic system is the hydraulic gear pump, referred to as the pump. So in a hydraulic system, you have to have a pump. Hydraulic gear pump is an energy conversion device, flow movement is its role, from mechanical energy into fluid energy. Pump is the power element in the hydraulic transmission system, driven by the prime mover, take out the mechanical energy from the prime mover's output power, and convert it into the pressure energy of the fluid, to provide pressure oil for the system. Then, where work is needed, the actuator converts fluid pressure energy into mechanical energy and outputs it to the gear pump.
 
Working principle and structure of gear oil pump
 
What role does hydraulic gear pump play in hydraulic system? Hydraulic gear pump is the heart of the hydraulic system, referred to as the pump. In a hydraulic system, there must be at least one pump. Hydraulic gear pump is an energy conversion device, its role is to make the flow movement, the mechanical energy into fluid energy. Pump is the power element in the hydraulic transmission system, driven by the prime mover, take out the mechanical energy from the prime mover's output power, and convert it into the pressure energy of the fluid, to provide pressure oil for the system. Then, where work is needed, the actuator converts fluid pressure energy into mechanical energy and outputs it to the gear pump.
 
Hydraulic gear pump is widely used in the hydraulic system of a hydraulic pump, it is generally made of quantitative pump, according to the different structure, gear pump divided into external gear pump and internal gear pump, and external gear pump is the most widely used. The following external gear pump as an example to analyze the gear pump. Hydraulic gear pump mainly includes: high pressure quantitative gear pump, high pressure double gear pump, lubrication pump, chemical pump, bidirectional gear motor, gear pump with regulating valve, gear pump with lifting valve. Working principle of the working principle and structure of the gear pump gear pump as shown in figure 3-3, it is the separation of three panel structure, three refers to the pump cover 4, 7, 8 and pump body, pump body within 7 is equipped with a pair of the same, the width and number of pump body closer to each other and the meshing gear 6, the gear with two end cover and pump body form a sealed cavity, and the gear tooth top and meshing line of the sealed cavity is divided into two parts, namely, oil pressure and oil suction cavity. The two gears are fixed by keys on the drive shaft 12 and driven shaft 15, which are supported by needle roller bearings. The drive shaft is driven by the motor to rotate.
 
Working principle of external gear pump
 
When the driving gear of the pump rotates in the arrow direction shown in the figure, the gear on the right side of the gear pump (oil suction chamber) disengages, and the tooth of the gear exits between the teeth, which increases the sealing volume and forms a local vacuum. Under the action of external atmospheric pressure, the oil in the oil tank enters into the teeth through the oil suction pipeline and oil suction chamber. As the gear rotates, the oil drawn in between the teeth is carried to the other side and into the oil chamber. At this time the gear teeth into mesh, so that the sealing volume gradually reduced, the part of the oil between the gear is extruded, forming the gear pump oil pressure process. When the gear meshes the tooth to the contact line to separate the oil absorption cavity and the oil pressure cavity, plays the role of oil distribution. When the driving gear of the gear pump is driven by the motor to rotate continuously, the gear teeth off the meshing side, due to the sealing volume is larger and constantly from the oil tank, the gear teeth into the meshing side, due to the sealing volume decreases the continuous discharge of oil, this is the working principle of the gear pump. The front and rear cover of the pump and the pump body are positioned by two positioning pins 17, fixed with 6 screws as shown in figure 3-3. In order to ensure the gear can be flexible rotation, and at the same time to ensure the minimum leakage, there should be appropriate clearance between the gear end face and pump cover (axial clearance), for small flow pump axial clearance is 0.025~0.04mm, large flow pump is 0.04~0.06mm. Addendum and the clearance between the pump body surface (radial clearance), because long seal belt, at the same time, addendum linear velocity and formation of shear flow and the oil leak in the opposite direction, so have less effect on the leak, here to consider the question is: when the gear is unbalanced radial force, should avoid collision of addendum and pump body wall can be slightly larger, so the radial clearance generally take 0.13 ~ 0.16 mm.
 
In order to prevent the leakage of pressure oil from the pump body and the pump cover to the pump, and reduce the tension of the pressure screw, an oil seal unloading groove 16 is opened on the end face of both sides of the pump body, so that the pressure oil seeping into the pump body and the pump cover into the oil absorption chamber. The hole in the pump cover and driven shaft also directs the pressure oil leaking to the bearing end to the pump suction chamber to prevent oil overflow and lubricate the needle roller bearing.
 
The composition of the hydraulic gear pump is as follows:
 
1- bearing outer ring 2- plug 3- roller 4- back pump cover 5- key 6- gear 7- pump body 8- front pump cover 9- screw 10- compression ring
 
11- seal ring 12- drive shaft 13- key 14- drain hole 15- driven shaft 16- drain groove 17- locating pin

The above:   Overview of gear pump development in China
 

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