KR20130090449A

KR20130090449A - Gear pump

Info

Publication number: KR20130090449A
Application number: KR1020120011565A
Authority: KR
Inventors: 이억수; 최준용; 윤지환; 김근호; 박병환; 박병훈
Original assignee: 주식회사 대유에스이
Priority date: 2012-02-06
Filing date: 2012-02-06
Publication date: 2013-08-14

Abstract

PURPOSE: A gear pump is provided to place driven gears at both sides of a driving gear in order to uniformly apply an eccentric load on the tooth of an eccentric gear to the both sides, thereby preventing the damage or fracture of the tooth. CONSTITUTION: A gear pump (100) includes a driving gear (120), a first driven gear (130a), a second driven gear (130b), a first inlet (112), a first outlet (112a), a second inlet (114), a second outlet (114a), and a connecting hose (140). The rotatable driving gear inside a casing (110) is rotated by a driving rotor (150). The mutually engaged driven gears inside the casing are collinearly placed at both sides, or the upper and the lower side of the driving gear, and are rotated by the rotation of the driving gear. A fluid respectively flows in the first inlet, and is discharged from the first outlet. The first inlet and outlet are collinearly placed between the driving gear and the first driven gear, and are formed at both sides, or the upper and the lower side of the casing. The fluid respectively flows in the second inlet, and is discharged from the second outlet. The second inlet and outlet are collinearly placed between the driving gear and the first driven gear, and are formed at both sides, or the upper and the lower side of the casing. The flow direction of the fluid in the first inlet and outlet is reverse to the flow direction of the fluid in the second inlet and outlet. The connecting hose is connected to the first outlet and the second inlet, and guides the fluid from the first outlet to the second inlet.

Description

Gear Pump

The present invention relates to a gear pump, and more particularly, by arranging driven gears on both sides of the drive gear, the eccentric load, which is heavy on the teeth of one side gear, is uniformly applied on both sides of the drive gear. The present invention relates to a gear pump that can prevent breakage or damage of gears.

In general, the gear pump is made of a structure consisting of a drive gear and a driven gear that is installed to engage the teeth of each other inside the casing (Casing). At this time, the driving gear is driven by the driven gear to mesh with each other to rotate the pumping action occurs.

As described above, the pumping action is carried out in a slight vacuum because the suction chamber is formed between the teeth and the teeth of the gear when the teeth of the gear fall from each other on the suction port side, and the volume of the suction chamber increases by the volume occupied by one of them. It is sandwiched between the gear groove and the casing outer circumference to pressurize the fluid in the discharge port direction.

In other words, the gear pump as described above is formed between the groove of the tooth and the wall of the circumference by rotating the gear by inserting a pump gear composed of two driving gears and a driven gear meshing with each other in a casing that is external to it. It consists of a structure of the pumping portion for flowing the fluid through the movement of the space.

The following shows the structure of a general gear pump.

Figure 1 is a side cross-sectional view showing a gear pump according to the prior art, Figure 2 is a front sectional view showing a gear pump according to the prior art.

As shown in FIGS. 1 and 2, the gear pump 10 according to the related art is driven with a drive gear 14 which is rotated by being engaged with each other in a casing 12 in which an inlet 12a and an outlet 12b are formed. It is made of a structure provided with a gear (16).

In the configuration of the gear pump 10 according to the related art as described above, the drive shaft 14a and the driven shaft 16a are formed at the center of each of the drive gear 14 and the driven gear 16. At this time, when the power is transmitted through the shaft 14a of the drive gear 14 by the driving means (motor, etc.), the driven gear 16 engaged with the drive gear 14 is rotated to perform a pumping action. .

However, in the gear pump according to the related art as described above, since one drive gear and one driven gear are engaged with each other by engagement, a problem arises in that the load is eccentric on only one side of the gears engaged with each other.

Therefore, in the gear pump according to the related art as described above, the problem of eccentric load, in which the load is eccentric, is generated only on one side where the teeth of the gear are engaged with each other. As a result, the life of the gear pump is reduced.

In addition, the gear pump according to the prior art as described above has a structure in which one drive gear and one driven gear are engaged with each other through engagement with each other, so that the intake and discharge of the fluid according to the driving of the gear are limited to one side, thereby limiting the pumping capability. The problem arises.

In addition, the gear pump according to the prior art has a drive rotor and a driven rotor made of a metal material, and the impurities generated from the wear of the gear when delivering liquids or foods requiring high purity due to the wear or damage of the gear. There is a fear that this mixture will cause a lot of problems.

The present invention has been made to solve the problems of the prior art, by arranging driven gears on both sides of the drive gear so that the load is applied uniformly on both sides of the drive gear to the eccentric load, which is placed on the teeth of the one-side gear. It is an object of the present invention to provide a gear pump that can prevent breakage or damage of teeth.

Another object of the technique according to the present invention is to arrange the driven gears on both sides of the drive gear so that the load of the eccentric load, which has been placed on the teeth of the one-side gear, is applied uniformly on both sides of the drive gear, thereby breaking the teeth. It is to prevent the damage or damage to extend the life expectancy of the gear pump.

In addition, the technique according to the present invention is to arrange the driven gears on both sides of the drive gear so that the fluid sucked and discharged through the one path is sucked and discharged through the other path to double the pumping capacity.

Furthermore, the object of the present invention is to manufacture a gear having excellent wear resistance by making the gear made of carbon plastic so that wear of the gear can be minimized during driving.

The present invention configured to achieve the above object is as follows. That is, the gear pump according to the present invention is a gear pump for pumping a fluid while meshing and rotating to engage the inside of the casing, the drive gear rotatably installed in the casing is rotated by the drive of the drive rotor; A first driven gear and a second driven gear which are engaged with each other on the same side or top and bottom of the drive gear in the casing and rotated by rotation of the drive gear; A first suction port and a first discharge port which are formed on both sides or above and below the casing positioned on the same path line between the drive gear and the first driven gear to suck and discharge the fluid; A second inlet formed on both sides of the casing located on the same path line between the drive gear and the second driven gear, or up and down to intake and discharge the fluid, but in which the fluid flows in a direction opposite to the first inlet and the first outlet; And a second discharge port; And a connection hose connected to the first discharge port and the second suction port to guide the fluid discharged through the first discharge port to the second suction port.

The drive gear and the driven gear according to the configuration of the present invention as described above, wherein the drive gear and the driven gear are 70 to 80 parts by weight of the metal powder, 35 to 40 parts by weight of the molten phenolic resin, abrasive, 100 parts by weight of the molten aramid fiber or glass fiber 10 to 15 parts by weight and carbon black 20 to 30 parts by weight of the mixture to form a gear material mixture and stirred for 2 to 10 hours through a stirrer, the thickness of the gear to be prepared by pressing the stirred gear material mixture The gear plate is formed into a mold, the formed gear plate is processed into a gear through a fine blanking mold, and the processed gear is heat treated under a temperature condition of 200 to 300 ° C. for 2 to 8 hours to obtain a heat-treated gear. After soaking the spindle oil for 6 to 8 hours for 12 to 36 hours and impregnating the spindle oil with the groove formed by carbon black on the cross section during the gear processing through fine blanking. It is produced by drying a gear at room temperature.

In addition, the carbon black in the configuration according to the present invention is made of a special carbon black CF (Conductive Furnace) type of beads (bead) form, but the particle size of 1 to 2 microns (μ) can be used as a HIBLACK.

According to the technique of the present invention, by aligning driven gears on both sides of the drive gear, the eccentric load, which is concentrated on the teeth of one side gear, is applied evenly on both sides of the drive gear, thereby preventing breakage or damage of teeth. I can prevent it.

In addition, another effect of the technique according to the present invention is to arrange the driven gears on both sides of the drive gear so that the load is applied uniformly on both sides of the drive gear. ) Life expectancy of gear pump can be extended by preventing breakage or damage.

In addition, the technique according to the present invention can arrange the driven gears on both sides of the drive gear so that the fluid sucked and discharged through one path is sucked and discharged through the other path, so that the pumping capacity can be doubled.

Furthermore, the technique according to the present invention can be produced by the gear made of carbon plastic to be able to produce a gear having excellent wear resistance to minimize the wear of the gear during driving.

Figure 1 is a side cross-sectional view showing a gear pump according to the prior art.
Figure 2 is a front cross-sectional view showing a gear pump according to the prior art.
Figure 3 is a side cross-sectional view showing a gear pump according to the present invention.
Figure 4 is a front cross-sectional view showing a gear pump according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the gear pump according to the present invention.

Figure 3 is a side cross-sectional view showing a gear pump according to the present invention, Figure 4 is a front sectional view showing a gear pump according to the present invention.

3 and 4, the gear pump 100 according to the present invention is rotatably installed in the casing 110, the drive gear 120, the casing (rotated by the drive of the drive rotor 150) 110, the first driven gear 130a, the second driven gear 130b, and the driving gear rotated by rotation of the drive gear 120 by engaging with each other on the same side of the drive gear 120 or up and down on the same line. First suction port 112 and first discharge port 112a which are formed on both sides or above and below the casing 110 positioned on the same path line between the 120 and the first driven gear 130a to intake and discharge the fluid. The first and second suction holes 112 and the first suction port 112 are formed on both sides of the casing 110 or the upper and lower sides of the casing 110 positioned on the same path line between the driving gear 120 and the second driven gear 130b. The second suction port 114 and the second in which the fluid flows in the opposite direction to the discharge port 112a. Constitution including a connection hose 140 connected to the outlet 114a and the first outlet 112a and the second inlet 114 to guide the fluid discharged through the first outlet 112a to the second inlet 114. Is done.

In other words, the gear pump 100 according to the present invention arranges the first driven gear 130a and the second driven gear 130b on the same upper and lower lines of the drive gear 120 as in the examples of FIGS. 3 and 4. It is made of a configuration that is interlocked with each other through the teeth. The gear pump 100 configured as described above pumps the fluid pumped through the driving gear 120 and the first driven gear 130a again through the driving gear 120 and the second driven gear 130b to pump the gear pump 100. The pumping capacity of) is doubled.

On the other hand, in addition to the above-described configuration, the first suction port 112 in which fluid is sucked to the left side of the casing 110 positioned on the same path line between the drive gear 120 and the first driven gear 130a on the upper side. ) Is formed, and the first discharge port 112a through which the fluid is discharged is formed on the right side.

In addition, in the present invention, the suction of the fluid discharged from the first discharge port 112a is performed on the right side of the casing 110 positioned on the same path line between the drive gear 120 and the second driven gear 130b on the lower side. The second suction port 114 is formed, and the second discharge port 114a through which the fluid is discharged is formed on the left side.

In the present invention, as described above, the fluid pumped through the first suction port 112 and the first discharge port 112a by the driving gear 120 and the first driven gear 130a is driven into the second suction port 114. The first discharge port 112a and the second suction port 114 are connected to each other so that the fluid can be discharged to the second discharge port 114a by driving the drive gear 120 and the second driven gear 130b. The connecting hose 140 is configured to.

Referring to each component of the gear pump 100 according to the present invention in more detail as follows. First, the drive gear 120 constituting the present invention rotates the first driven gear 130a and the second driven gear 130b through a rotational drive. Such a drive gear 120 is shown in FIGS. 3 and 4. As shown in the drawing, the drive shaft 122 is installed inside the casing 110 with the rotation center as the rotation shaft driven by the driving rotor 150.

Next, the first driven gear 130a and the second driven gear 130b constituting the present invention are rotated according to the rotational drive of the drive gear 120 to generate a pumping action of the fluid between the drive gear 120. As such, the first driven gear 130a and the second driven gear 130b may have a casing 110 with the driven shafts 130a-1 and 130b-1 as the rotation center, as shown in FIGS. 3 and 4. ) Is engaged with each other through the upper and lower teeth on the same line of the drive gear 120 therein is made of a configuration that is rotated by the rotation of the drive gear 120.

The first driven gear 130a and the second driven gear 130b configured as described above, when the rotation of the drive gear 120 is rotated in the clockwise direction, the first driven gear 130a is rotated in the counterclockwise direction so that the fluid Flows from the first suction port 112 formed on the left side of the casing 110 to the first discharge port 112a on the right side, and the second driven gear 130b is also rotated counterclockwise to allow the first discharge port to flow. The fluid discharged through the 112a may be sucked into the second suction port 114 formed on the right side of the casing 110 to be pumped to the second discharge port 114a on the left side.

In addition, the first suction port 112 and the first discharge port 112a of the present invention allow the pumping of the fluid according to the driving of the drive gear 120 and the first driven gear 130a. The first suction port 112 and the first discharge port 112a are both sides of the casing 110 positioned on the same path line between the drive gear 120 and the first driven gear 130a as shown in FIGS. 3 and 4. Or formed above and below the suction and discharge of the fluid.

The first suction port 112 and the first discharge port 112a, which are configured as described above, are disposed on both sides of the casing 110 because the drive gear 120 and the driven gears 130a and 130b are installed in the upper and lower directions in the present invention. Is installed. At this time, since the rotation direction of the drive gear 120 is clockwise, the first suction port 112 is formed at the left side of the casing 110, and the first discharge port 112a is formed at the right side of the casing 110.

Next, the second suction port 114 and the second discharge port 114a constituting the present invention is to allow the pumping of the fluid according to the driving of the drive gear 120 and the second driven gear 130b, such a As shown in FIGS. 3 and 4, the second suction port 114 and the second discharge port 114a are disposed on the same path line between the drive gear 120 and the second driven gear 130b. It is formed on both sides or up and down to intake and discharge of the fluid is made of a configuration in which the flow of the fluid in the opposite direction to the first suction port 112 and the first discharge port (112a).

In other words, the flow of the fluid pumped through the second inlet 114 and the second outlet 114a constituting the present invention is characterized by the flow of the fluid pumped through the first inlet 112 and the first outlet 112a. Is made in the opposite direction. That is, the second suction port 114 is formed in the right direction of the casing 110 like the first discharge port 112a, and the second discharge port 114a is formed in the left direction of the casing 110 like the first suction port 112. Is formed.

In addition, the connection hose 140 constituting the present invention connects the first discharge port 112a and the second suction port 114, and the connection hose 140 is the first discharge port 112a as shown in FIG. ) Is connected to the second suction port 114 to guide the fluid discharged through the first discharge port 112a to the second suction port 114.

As described above, the first discharge port 112a and the second suction port 114 are connected to each other through the connection hose 140, and thus the discharge pressure due to the pumping action of the drive gear 120 and the first driven gear 130a is generated. 1 The suction pressure caused by the pumping action of the drive gear 120 and the second driven gear 130b by causing the fluid discharged to the discharge port 112a to be guided under pressure to the second suction port 114 through the connection hose 140. It can be seen that the pumping capacity of the gear pump 100 is doubled by allowing the fluid sucked through the connection hose 140 to the second suction port 114 by suction.

On the other hand, in the configuration of the gear pump 100 according to the present invention configured as described above the drive gear 120 and the driven gear (130a, 130b) is aramid fiber or glass fiber metal powder, phenolic resin, abrasive and carbon black After mixing in a predetermined ratio to form a gear material mixture (S100), the mixed gear material mixture is stirred for a predetermined time through a mixer (S110) to ensure uniform mixing of materials. Of course, aramid fiber or glass fiber and phenol resin should be molten.

In the above-described gear material mixture composed of molten aramid fiber (or glass fiber), metal powder, molten phenolic resin, abrasive and carbon black, aramid fiber or glass fiber is a reinforcing agent (or reinforcing agent) that imparts the strength of the gear. Aramid fiber as a reinforcing agent for imparting strength is an aromatic polyaramid fiber having excellent strength and heat resistance.

In other words, aramid fiber (CONH) combines an aromatic ring such as benzene ring to form a polymer polyamide, and has excellent tensile strength, toughness and heat resistance, and has high strength and high elastic modulus. It is known to be five times stronger than steel of the same weight. It is a thin thread about 5mm thick, but it has the power to lift a 2t car. In addition, aramid fibers are not burned or melted, and are carbonized only after 500 ° C.

In addition, the aramid fibers as described above do not stretch no matter how much force is considered the best plastic reinforcement (補强材). Due to these advantages, it is a suitable material for making military items such as bulletproof jackets and bulletproof helmets, golf clubs, and tennis rackets. Internal aggregates of aircraft such as Boeing 747 use epoxy resin (FRP) reinforced with this fiber. In 1984, Dr. Han Han-sik (KIST), the team of researchers at Korea Institute of Science and Technology developed the world's third aramid fiber after the United States and the Netherlands. The company succeeded in developing new aramid fiber that eliminates the property of shrinking when the temperature rises as opposed to the general property of the material expanding with the increase of the ambient temperature.

And, in the case of glass fiber (glass fiber) as a reinforcing agent for imparting the strength of the gear as described above, one of the artificial fibers, such glass fiber is melted glass with less alkali components to increase the speed at high speed or blow by blowing with high-pressure air It is made. These glass fibers are resistant to heat and moisture and do not rust, so they are used as insulation materials, sound insulation materials, insulation materials and optical communication materials, as well as plastic reinforcement materials.

Glass fibers as described above form the fibers in yarn form through a continuous filament process. At the end of the metal barrel to which the molten glass is fed is a spinneret, which extrudes a very fine filament yarn. Hundreds of extruded filaments are combined to form a single stranded yarn. Modern processes using centrifugal forces in the production of short fibers (glass wool) use metal disc spinning machines with hundreds of fine holes. The molten glass blown out by centrifugal force forms a fiber phase by the blower.

On the other hand, the waste phenol resin which forms the gear material mixture as described above functions to bind the materials of molten aramid fiber (or glass fiber), metal powder, abrasive and carbon black as a binder. This phenol resin is a term that refers to a resin made by condensation and polymerization of phenols and aldehydes. It has high flame resistance and high mechanical strength, excellent insulation and water resistance, and is widely used for electric parts and adhesives.

In addition, the carbon black constituting the gear material mixture as described above is a sliding control agent of the gear, the carbon black is a special carbon black particle size of 1 to 2 microns made of CF (Conductive Furnace) type beads (bead) μ) HIBLACK was used. In other words, the spindle oil is impregnated in the groove formed in the carbon black portion at the processing cross section so that the friction between the two gears does not occur.

Carbon black as described above is usually obtained in the form of soot by partial combustion of hydrocarbons. The carbon black is mainly used as a reinforcing agent for automobile tires and other rubber products, and as a black pigment with a large hiding power of a dry film, and is used for printing inks, paints and paper.

In addition, carbon black as described above is used as a protective film, a resistor of plastics and an electronic circuit, as well as used as a reinforcing filler to increase wear resistance and wear resistance. About 1/4 of the car's standard tire weight is carbon black. Tires used in automobiles, such as oil and hospital cars, add carbon black to increase the electrical conductivity of rubber to prevent static charges from accumulating on the wheels.

The carbon black particles as described above are usually crystalline and are a crystalline material having a lower regularity than graphite. When carbon black is heated at 3,000 ° C. for a long time, it turns into graphite. Carbon black is a material that can vary the size of the particles according to the manufacturing process among the very fine particles of material known to date.

In other words, the carbon black as described above may be defined as a "carbon element" made under process conditions in which the size agglomeration state of the particles, surface properties, and the like are controlled. It has been almost 100 years since the carbon black began to be used, and with the development of manufacturing methods, various grades of product development have been actively carried out, and thus a steady market change has occurred.

In the present invention, particulate iron (Fe) was used as the metal powder for forming the gear material mixture as described above.

On the other hand, the composition ratio of the gear material mixture consisting of aramid fibers (or glass fibers), metal powders, phenol resins, abrasives and carbon black in the above-described configuration is 70 to 80 parts by weight of metal powder to 100 parts by weight of molten aramid fibers or glass fibers It is mixed at a ratio of 35 to 40 parts by weight of the molten phenol resin, 10 to 15 parts by weight of the abrasive and 20 to 30 parts by weight of carbon black.

Next, as described above, a predetermined size to the thickness of the gear for the gear pump to prepare a gear material mixture made of a uniform mixture of aramid fibers (or glass fibers), metal powder, phenolic resin, abrasive and carbon black through stirring. The gear plate material is molded. At this time, in the present invention, the compression molding was carried out at a pressure of 150 to 250 kgf / cm ² through a 25 to 75 ton press to form a plate having a size of 1 m × 1 m in length and width.

As described above, after molding into a gear plate material having a predetermined size corresponding to the thickness of the gear pump gears 120, 130a and 130b to be manufactured, the formed gear plate is processed into a gear through a fine blanking mold. do. At this time, when the gear plate is processed into a gear through a fine blanking mold, the gears 120, 130a, and 130b are formed by punching under a pressure of 350 to 450 kgf / cm ^{2 using} a 200 to 300 ton press. Pick from the board.

In other words, the molded gear plate material forms the gears 120, 130a and 130b to be manufactured by blanking through a fine blanking mold having the shape of the gear member in the press. At this time, the tolerance should be processed to ± 0.05mm.

Next, as described above, after the gear plate is processed into the gears 120, 130a and 130b through a fine blanking mold, the processed gears 120, 130a and 130b are subjected to a temperature condition of 200 to 300 ° C. Under heat treatment for 2 to 8 hours, the mechanical properties such as hardness, strength and toughness of the gear were further improved.

As described above, the heat-treated gears 120, 130a, and 130b are immersed in the spindle oil so that the spindle oil is impregnated into grooves formed by the carbon black of the processing cross section. At this time, the spindle oil uses spindle oil having a viscosity of 6 to 8, and the time for immersing the gears 120, 130a and 130b in the spindle oil is soaked for 12 to 36 hours.

In other words, the impregnation of the spindle oil as described above, the gears (120, 130a, 130b) processed through the fine blanking mold is formed by cutting the portion containing carbon black from the surface during the fine blanking process to form fine grooves do. Thus, when the machined gears 120, 130a and 130b are immersed in the spindle oil, the grooves are impregnated with the spindle oil so that the gears have a lubricating property on the processing cross section. Therefore, when the two gears 120, 130a, and 130b are engaged with each other and rotated, a lubrication film is formed to reduce friction and to rotate smoothly.

Next, as described above, the gears heat-treated in the spindle oil (120, 130a, 130b) is immersed for a predetermined time to allow the impregnation of the spindle oil in the groove formed in the portion containing the carbon black on the surface during the fine blanking process Next, the spindle oil-impregnated gears (120, 130a, 130b) is dried at room temperature (15-25 ° C) to complete the plastic gear for the gear pump to be produced in the present invention.

As described above, the technique according to the present invention arranges the driven gears 130a and 130b on both sides of the drive gear 120 to uniformly load the eccentric loads on the teeth of the one-side gear on both sides of the drive gear 120. By allowing a load to act, it is possible to prevent the tooth from breaking or damaging.

In addition, as described above, the life expectancy of the gear pump can be extended by preventing breakage or damage of the teeth, as well as fluids sucked and discharged through one path by arranging driven gears on both sides of the drive gear. The pumping capacity can be doubled by allowing the suction and discharge through the other path.

In addition, the technology according to the present invention can produce a gear having excellent wear resistance by manufacturing the gear from carbon plastic.

Although specific embodiments of the present invention have been described in detail above, it should be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10. Gear Pump 12. Casing
12a. Inlet 12b. Outlet
14. Drive gear 14a. driving axle
16. Follower Gear 16a. Driven shaft
100. Gear Pump 110. Casing
112 114. Intake ports 112a, 114a. Outlet
120. Drive Gear 122. Drive Shaft
130a, 130b. Follower gear 130a-1, 130b-1. Driven shaft
140. Connection hose 150. Drive rotor

Claims

In the gear pump for pumping the fluid while rotating to mesh with each other through the engagement of the inside of the casing,
A drive gear rotatably installed in the casing and rotated by driving of a drive rotor;
A first driven gear and a second driven gear that are engaged by engagement with both sides of the drive gear in the casing or up and down in the casing to be rotated by rotation of the drive gear;
A first suction port and a first discharge port which are formed on both sides or above and below the casing positioned on the same path line between the drive gear and the first driven gear to suck and discharge fluid;
It is formed on both sides or up and down of the casing located on the same path line between the drive gear and the second driven gear to intake and discharge the fluid, but the fluid flows in the opposite direction to the first suction port and the first discharge port. A second suction port and a second discharge port; And
And a connection hose connected to the first discharge port and the second suction port to guide the fluid discharged through the first discharge port to the second suction port.

According to claim 1, wherein the drive gear and the driven gear is 70 to 80 parts by weight of metal powder, 35 to 40 parts by weight of molten phenolic resin, 10 to 15 parts by weight of abrasive and carbon black 20 to 100 parts by weight of molten aramid fiber or glass fiber After mixing in a proportion of ˜30 parts by weight to form a gear material mixture and stirred for 2 to 10 hours through a stirrer, the gear plate material is molded to the thickness of the gear to be prepared by pressing the stirred gear material mixture, After the gear plate is processed into a gear through a fine blanking mold, the processed gear is heat-treated for 2 to 8 hours under a temperature condition of 200 to 300 ° C., and the heat-treated gear is subjected to a spindle oil having a viscosity of 6 to 8 to 12 to It is manufactured by drying the gear at room temperature in the state impregnated with spindle oil into the groove formed by the carbon black of the cross section when the gear is processed by soaking for 36 hours through fine blanking. Gear pump according to claim a.

3. The gear pump of claim 2, wherein the carbon black is a special carbon black, which is made of CF (Conductive Furnace) type beads, but has a particle size of 1 to 2 microns (HI).