WO2020226338A1

WO2020226338A1 - Piston pump

Info

Publication number: WO2020226338A1
Application number: PCT/KR2020/005647
Authority: WO
Inventors: 이기춘
Original assignee: 이기춘
Priority date: 2019-05-07
Filing date: 2020-04-29
Publication date: 2020-11-12
Also published as: KR20200128780A; KR102208359B1

Abstract

The present invention relates to a piston pump having a seal ring which is closely adhered to the inner surface of a cylinder, and which, even when worn down while a piston reciprocates inside the cylinder, expands by the worn down amount to constantly and uniformly maintain close adhesion to the inner circumferential surface of the cylinder. The piston pump, in which a piston (10) is inserted into a cylinder (20) having a suction port (21) and a discharge port (22) formed therein, the piston (10) is made to reciprocate in the cylinder (20) by a driving means (30), and the reciprocation of the piston (10) causes a fluid to flow into the cylinder (20) through the suction port (21) and then be discharged to the outside through the discharge port (22), is characterized in that the piston (10) has a plurality of seal rings (12) inserted onto a cylindrical head portion (11), a cover cap (13) is mounted to a tip end of the head part (11) by a bolt (14), and the seal rings (12) are disposed between a flange (112) of the head portion (11) and the cover cap (13).

Description

Piston pump

The present invention relates to a piston pump in which pumping is performed by a reciprocating stroke of a piston disposed inside a cylinder, and more particularly, a sealing ring is disposed around the head of the piston to allow contraction and expansion, so that the piston is placed in the cylinder. When fitted, the piston is inserted into the cylinder with the sealing ring contracted, so that even if the sealing ring in close contact with the inner circumferential surface of the cylinder wears in the process of the piston reciprocating within the cylinder, the sealing ring is worn. It is expanded by an amount, and the contact force of the sealing ring in close contact with the inner circumferential surface of the cylinder is always maintained constant.

Korean Utility Model Registration No. 20-0169160 (November 17, 1999, registration) introduces "Piston Pump Driving Device".

The driving device of the piston pump includes an electric motor generating rotational force, a reducer connected to the electric motor to decelerate, a tubular oil tube located at the lower end of the piston pump, and a base supporting the electric motor and the oil tube. A plate, bearing blocks fixed on both sides of the inner wall of the oil tube, bearings respectively installed on the bearing block), and a crankshaft supported by the bearing and connected to the axial force end of the reducer. One end is eccentrically clevis-connected to the crankshaft, and the other end is composed of a connecting rod clevis-connected to the reciprocating motion shaft of the piston pump.

However, in the driving device of the piston pump, when the drive shaft of the electric motor is directly connected to the crankshaft, and a plurality of connecting rods are mounted on the crankshaft, there is a risk that the crankshaft is damaged due to torsional stress.

Korean Patent No. 10-0463085 (registered on December 14, 2004) introduces "the piston of a high pressure pump with pressure distribution, cooling and lubrication functions".

The piston of the high-pressure pump with pressure distribution, cooling, and lubrication functions is provided with O-rings in multiple stages on the circumferential surface of the piston in the piston of the high-pressure pump, and a water receiving groove is provided between the O-rings, and the water receiving groove is provided at equal intervals. It is configured to be divided and connected with the water distribution hole of the upper and lower surfaces of the piston.

However, the piston of the high pressure pump having the above pressure distribution, cooling and lubrication functions has no method of compensating for the amount of wear of the O-ring when the O-ring is worn by friction between the inner wall of the cylinder and the O-ring of the piston.

Accordingly, an object of the present invention is that the sealing ring is arranged to be able to contract and expand around the head of the piston, so that when the piston is fitted into the cylinder, the piston is fitted into the cylinder with the sealing ring contracted. During the reciprocating movement of the piston inside, even if the sealing ring in close contact with the inner circumferential surface of the cylinder is worn, the sealing ring expands by the amount of wear, so that the adhesion of the sealing ring in close contact with the inner circumferential surface of the cylinder is always kept constant. It is to provide a piston pump.

Another object of the present invention is that a plurality of gear cam members are arranged in a top and bottom multi-stage inside a gearbox, and each gear cam member is meshed and interlocked, so that the rotational force of the uppermost gear cam member is uniformly transmitted to the lowermost gear cam member. , The cylinders are arranged in a one-to-one correspondence with the gear cam member on the side of the gearbox, and the pistons mounted on each cylinder are connected by each gear cam member and the connecting rod, so that the rotation of each gear cam member has a phase difference. As a result, the fluid can be uniformly discharged, low-power driving rotation can be performed, energy can be saved, and the pumping capacity is increased as the number of cylinders increases.

An example of a piston pump according to the present invention for achieving the above object is

A piston is inserted into a cylinder having an inlet and a discharge port, and the piston makes a reciprocating stroke motion in the cylinder by the driving means, and the fluid flows into the cylinder through the intake port and outward through the discharge port by the reciprocating stroke motion of the piston. In the discharged piston pump,

The piston is characterized in that a plurality of sealing rings are fitted to a cylindrical head portion, and a cover cap is mounted by a bolt at the tip of the head portion, and the sealing ring is disposed between the flange of the head portion and the cover cap.

The sealing ring is characterized in that it consists of a rubber ring and a C-ring mounted in a mounting groove formed around the rubber ring.

In the rubber ring, a bent portion in the shape of a base is formed around the disk portion in which the center hole is formed, a mounting groove is formed around the disk portion by the bending portion, and a C-ring is mounted in the mounting groove.

The C-ring may be any one of spring steel or plastic material, and a cutout portion is formed.

The C ring has an outer diameter larger than the diameter of the rubber ring mounting groove, and when the C ring is inserted into the mounting groove of the rubber ring, the rubber ring expands by the C ring, increasing the outer diameter of the rubber ring. When the outer diameter of the expanded rubber ring becomes larger than the inner diameter of the cylinder and the piston is forcibly inserted into the cylinder, the C ring is compressed, and the outer peripheral surface of the rubber ring is in close contact with the inner peripheral surface of the cylinder at a predetermined pressure.

In the process of the piston reciprocating within the cylinder, even if the outer circumferential surface of the rubber ring is worn by friction with the inner circumferential surface of the cylinder, the C-ring expands as much as the outer circumferential surface of the rubber ring wears, so that the rubber ring continues. It is characterized in that it is always in close contact with the inner peripheral surface of the cylinder at the same pressure.

The sealing ring is characterized in that the number of C-rings fitted into the mounting grooves of the rubber ring can be selected differently according to the adhesion force of the outer circumferential surface of the rubber ring to the inner circumferential surface of the cylinder.

When two or more C-rings are mounted in the mounting groove of the rubber ring, the cutout portions are arranged in different directions.

The piston is characterized in that a plurality of sealing rings are mounted on a cylindrical head portion, and the number of sealing rings mounted on the head portion is varied according to a force that presses the piston to move when the piston performs a reciprocating stroke motion in the cylinder. To do.

In addition, the piston further includes a support ring fitted to the head.

The support ring is characterized in that it consists of a cylindrical portion fitted to the head portion and a disk portion disposed at one end of the cylindrical portion.

The support ring is set with the sealing ring and is fitted to the head, so that the tip of the cylinder is in close contact with the disc of the rubber ring, the disc is in close contact with the bent part of the rubber ring, and a space between the support ring and the rubber ring is It is formed, characterized in that the lubricating oil is filled in the space.

The support ring is characterized in that the protection ring is mounted around the disk portion.

The cover cap is characterized in that a mounting groove is formed around the periphery, and an iron core ring is mounted in the mounting groove.

The iron core ring is for preventing the protection ring and the rubber ring from being damaged by a solid material or a metal material during a pumping process, and the outer diameter is formed to be smaller than the outer diameter of the rubber ring.

The cylinder is characterized in that the guide inclined portion is formed at one end to which the piston is fitted.

In the multi-stage piston pump according to the present invention, a plurality of gear cam members are arranged in a vertical row inside a gearbox, and the power of the motor is a first gear cam member disposed at the top of the plurality of gear cam members through a power transmission means. And a plurality of gear cam members arranged in a vertical row are interlocked and interlocked with each other, so that the power of the first gear cam member disposed at the top is transmitted to the gear cam member disposed at the lowermost part, and to one side of the gear box. A plurality of cylinders are arranged in a one-to-one correspondence with the gear cam member, and each gear cam member and a piston of the cylinder are connected to each other by a connecting rod.

The gear cam member is a combination of a gear and a cam member, and the first to third connection holes are formed in the cam member, and the distance between the rotation center and the first connection hole is greater than the distance between the rotation center and the second connection hole. It is characterized in that the distance between the rotation center and the second connection hole is larger than the distance between the rotation center and the third connection hole.

When one end of the connecting rod is connected to the first connection hole and the other end of the connecting rod is connected to the piston, the piston has the longest first stroke distance in the cylinder, and one end of the connecting rod is connected to the second connection hole, When the other end of the connecting rod is connected to the piston, the piston has a second stroke distance shorter than the first stroke distance in the cylinder, one end of the connecting rod is connected to the third connection hole, and the other end of the connecting rod is connected to the piston, The piston is characterized in that it has a third stroke distance shorter than the second stroke distance in the cylinder.

The power transmission means includes a driving gear on a drive shaft of a motor mounted on an upper surface of the gearbox, a first electric gear meshing with the driving gear, a second electric gear mounted on the same shaft as the first electric gear, and a second It is composed of a driven gear engaged with the electric gear, and the driven gear is mounted on the same shaft as the first gear cam member disposed inside the gear box.

In the piston pump according to the present invention, 2 to 5 gear cam members are arranged in a row on the gear box, and cylinders are arranged in 2 to 5 stages on one side of the gear box in a one-to-one correspondence with the gear cam member, and the gear cam It is characterized in that the member and the piston of the cylinder are connected in a one-to-one correspondence by a connecting rod.

When each gear cam member has a phase difference with an adjacent gear cam member, the phase difference of the gear cam member is determined according to the number of gear cam members mounted on the gearbox.

The piston is characterized in that the radius from the center to the top is smaller than the radius from the center to the side, and the radius from the center to the bottom is formed in an elliptical shape that is smaller than the radius from the center to the side.

The multi-stage double-acting piston pump according to the present invention further comprises a plurality of double-acting cylinders connected to the opposite side of the gearbox in the multistage piston pump described above, wherein the double-acting cylinder is centered on the gearbox and on the opposite side of the cylinder. It is disposed, and each gear cam member and the piston of the double acting cylinder are respectively connected by an auxiliary connecting rod, and the auxiliary connecting rod is connected to the gear cam member in the opposite direction in a one-to-one correspondence with the connecting rod.

The 2nd to 5th stage piston pump according to the present invention further comprises 2 to 5 double acting cylinders connected to the opposite side of the gearbox in the 2nd to 5th stage piston pump described above, wherein the double acting cylinder is a gear Arranged on the opposite side of the cylinder centering on the box, each gear cam member and the piston of the double-acting cylinder are connected by auxiliary connecting rods, respectively, and the auxiliary connecting rod is connected to the gear cam member in the opposite direction in a one-to-one correspondence with the connecting rod. It features.

Another example of the multi-stage double-acting piston pump according to the present invention is that the gear cam members of the first gear cam member group and the gear cam members of the second gear cam member group are disposed to face each other, and one of the gearboxes On one side, the cylinders of the first cylinder group and the cylinders of the second cylinder group are arranged in two rows, and the cylinders of the first cylinder group) and the gear cam members of the first gear cam member group are arranged in a one-to-one correspondence, and the second The cylinder of the cylinder group and the gear cam member of the second gear cam member group are arranged in a one-to-one correspondence, the first motor and the second motor are respectively disposed on the upper surface of the gearbox, and the power of the first motor is transmitted to the first power. It is transmitted to the uppermost gear cam member disposed at the uppermost part of the first gear cam member group through means, and the gear cam members of the first gear cam member group are meshed and interlocked with each other, so that the power of the uppermost gear cam member is disposed at the lowermost part. It is transmitted to the gear cam member, and the power of the second motor is transmitted to the uppermost gear cam member disposed at the top of the second gear cam member group through the second power transmission means, and the gear cam members of the second gear cam member group are By interlocking and interlocking with each other, the power of the uppermost gear cam member is transmitted to the lowermost gear cam member disposed at the lowermost part, and the gear cam member of the first gear cam member group and the piston of the first cylinder group are connecting rods of the first connecting rod group. The gear cam members of the second gear cam member group and the piston of the second cylinder group are respectively connected by means of the connecting rods of the second connecting rod group.

In the above, there may be 2 to 6 gear cam members of the first and second gear cam member groups, and 2 to 6 cylinders of the first and second cylinder groups.

Accordingly, the piston pump according to the present invention expands by the amount of wear of the sealing ring in close contact with the inner circumferential surface of the cylinder in the process of reciprocating the piston in the cylinder. The adhesive force of the sealing ring in close contact with the sealing ring is always kept constant, the fluid can be uniformly discharged, the pumping capacity increases as the number of cylinders increases, the fluid can be uniformly discharged, and low power drive rotation is possible. , It has the effect of saving energy.

1 is a cross-sectional view schematically showing a piston pump according to the present invention.

Figure 2 is an exploded perspective view showing the piston of the piston pump according to the present invention.

3 is a cross-sectional view schematically showing a piston according to the present invention.

Figure 4 is an exploded perspective view showing a sealing ring according to the present invention, showing a part of the rubber ring cut away.

5 is a cross-sectional view showing a sealing ring in a state in which the C-ring is mounted on the rubber ring.

6 is for explaining the relationship between the diameter of the C ring and the rubber ring.

7 shows the relationship between the diameter of the piston and the inner diameter of the cylinder before the piston is inserted into the cylinder.

8 shows an example in which the piston is inserted into the cylinder, and the sealing ring of the piston is contracted so that the diameter of the piston is in close contact with the inner circumferential surface of the cylinder.

9 is a cross-sectional view showing a state in which a support ring and a sealing ring are set and mounted on the head of the piston.

10 is an exploded perspective view showing a part of the support ring and the sealing ring of FIG. 9 by cutting.

11 is a cross-sectional view showing a state in which a protection ring is mounted around a disk portion of a support ring.

12 is a cross-sectional view showing a state in which an iron core ring is mounted around a cover cap.

13 schematically shows that a guide inclined portion is formed at one end of the cylinder so that the piston fits well into the cylinder.

14 is a cross-sectional view showing that a plurality of cylinders arranged in multiple stages are connected to the gearbox on the side to explain the idea of the piston pump according to the present invention.

15 is a perspective view showing a gear cam member.

16 is for explaining the relationship between the distance between the rotation center of the gear cam member and the connection hole and the stroke distance of the piston.

17 is a perspective view for explaining the power transmission means of the piston pump according to the present invention.

18 is a cross-sectional view showing a power transmission means of the piston pump according to the present invention.

19 is a cross-sectional view showing a two-stage piston pump having two cylinders.

20 to 23 illustrate a process in which suction and discharge proceed with a phase difference of 180 degrees between the first cylinder and the second cylinder by the piston reciprocating stroke.

24 shows an elliptical cross section of the piston in close contact with the inner circumferential surface of the cylinder.

25 is a cross-sectional view showing a three-stage piston pump having three cylinders.

26 is a cross-sectional view showing a four-stage piston pump having four cylinders.

27 is a cross-sectional view showing a five-stage piston pump having five cylinders.

28 is a cross-sectional view showing a multistage double-acting piston pump.

29 is a cross-sectional view showing a two-stage double-acting piston pump.

30 is a cross-sectional view showing a three-stage double-acting piston pump.

31 is a cross-sectional view showing a four-stage double-acting piston pump.

32 is a cross-sectional view showing a five-stage double-acting piston pump.

33 is a perspective view showing another form of a multi-stage double-acting piston pump according to the present invention, showing a gearbox processed by a thin two-dot chain line.

34 is a perspective view showing another form of a multi-stage double-acting piston pump according to the present invention, showing a state in which each piston is connected to a gear cam member by a connecting rod.

35 is a rear view showing another form of a multi-stage double-acting piston pump according to the present invention, showing a power transmission means for transmitting the power of the motor to the gear cam member.

36 is a perspective view showing another form of a two-stage double-acting piston pump according to the present invention, and shows a gearbox processed by a thin two-dot chain line.

37 is a perspective view showing another form of a two-stage double-acting piston pump according to the present invention, showing a state in which each piston is connected to a gear cam member by a connecting rod.

38 is a rear view showing another form of a two-stage double-acting piston pump according to the present invention, and shows a power transmission means for transmitting the power of the motor to the gear cam member.

39 to 41 are views for explaining another form of a three-stage double-acting piston pump according to the present invention.

42 is a perspective view showing another form of a four-stage double-acting piston pump according to the present invention.

43 is a perspective view showing another form of a five-stage double-acting piston pump according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

When describing the embodiments of the present invention, for convenience and understanding of description, the same reference numerals will be used for components having the same function.

Referring to FIG. 1, in the piston pump according to the present invention, a piston 10 is inserted into a cylinder 20 having a suction port 21 and a discharge port 22, so that the piston 10 is driven by the driving means 30. The reciprocating stroke motion is performed at 20), and the fluid is introduced into the cylinder 20 through the suction port 21 by the reciprocating stroke motion of the piston 10 and then discharged to the outside through the discharge port 22.

2 and 3, the piston 10 has a plurality of sealing rings 12 fitted to the cylindrical head 11, and the cover cap 13 is bolted to the front end of the head 11 14), the sealing ring 12 is disposed between the flange 112 of the head 11 and the cover cap 13.

Reference numeral 15, which is not described, is a pin boss disposed at the rear end of the head portion 11, and the pin boss 15 is connected to the connecting rod 31 of the driving means 30 by a connecting pin 16 (see FIG. 1). do.

The piston 10 configured as described above has the advantage that it can be replaced very easily when the sealing ring 12 is worn by friction with the cylinder 20.

4 and 5, the sealing ring 12 is composed of a rubber ring 120 and a C-ring 125 mounted in a mounting groove 124 formed around the rubber ring 120.

The rubber ring 120 is formed with a bent portion 123 in the shape of a lattice around the disk portion 121 in which the center hole 122 is formed, and is mounted around the disk portion 121 by the bent portion 123 The groove 124 is formed, and the C-ring 125 is mounted in the mounting groove 124.

The C-ring 125 is made of a spring steel material, and the cutout 126 is formed, so that the diameter of the cutout 126 is narrowed and the diameter can be contracted.

6 to 8, as shown in FIG. 6, the C ring 125 has an outer diameter d1 greater than the diameter d2 of the mounting groove 124 of the rubber ring 120, and C When the ring 125 is inserted into the mounting groove 124 of the rubber ring 120, the rubber ring 120 expands by the C-ring 125, so that the outer diameter d3 of the rubber ring 120 increases. And, as shown in Figure 7, the outer diameter (d3) of the expanded rubber ring 120 is larger than the inner diameter (d4) of the cylinder 20, as shown in Figure 8, the piston 10 is the cylinder ( When forcibly inserted into 20), the C-ring 125 is compressed, so that the outer circumferential surface of the rubber ring 120 is in close contact with the inner circumferential surface of the cylinder 20 at a predetermined pressure.

And, as shown in Figure 8, in the process of the piston 10 reciprocating stroke movement inside the cylinder 20, even if the outer circumferential surface of the rubber ring 120 is worn by friction with the inner circumferential surface of the cylinder 20, As the outer circumferential surface of the rubber ring 120 is worn, the C-ring 125 expands, so that the rubber ring 120 is constantly in close contact with the inner circumferential surface of the cylinder 20 at the same pressure.

Accordingly, in the piston pump according to the present invention, even if the outer circumferential surface of the rubber ring 120 is worn due to friction with the inner circumferential surface of the cylinder 20 in the course of the piston 10 reciprocating inside the cylinder 20 , As the outer circumferential surface of the rubber ring 120 is worn, the C-ring 125 expands, and the rubber ring 120 is constantly in close contact with the inner circumferential surface of the cylinder 20 at the same pressure, so that the rubber ring 120 Until this is completely worn, it is possible to prevent the initial set pumping pressure from being lowered, as well as the advantage that the piston 10 can be used for a long time.

Referring again to Figure 4, in addition, the sealing ring 12 is C that is fitted into the mounting groove 124 of the rubber ring 120 according to the adhesion force that the outer circumferential surface of the rubber ring 120 is in close contact with the inner circumferential surface of the cylinder 20. The number of rings 125 can be selected differently.

For example, when the adhesive force of the rubber ring 120 that is in close contact with the inner circumferential surface of the cylinder 20 is to be high, six C rings 125 are mounted in the mounting groove 124 of the rubber ring 120, and the cylinder 20 ) As the adhesive force of the rubber ring 120 in close contact with the inner circumferential surface decreases, the number of C-rings 125 fitted into the mounting groove 124 of the rubber ring 120 can be reduced.

At this time, as shown in FIG. 4, when two or more C-rings 125 are mounted in the mounting groove 124 of the rubber ring 120, the cutouts 126 are arranged in different directions.

In this way, by arranging the cutouts 126 of the C-ring 125 inserted into the mounting groove 124 of the rubber ring 120 in different directions, when the piston 10 is brought into the cylinder 20, The adhesive force is uniformly applied to the circumference of the rubber ring 120.

Referring back to FIG. 3, the piston 10 shown in FIG. 3 is shown as having four sealing rings 12 mounted on a cylindrical head 11, but this is an example for explaining the spirit of the present invention. However, the present invention is not limited thereto, and when the piston 10 performs a reciprocating stroke in the cylinder 20, the piston 10 is mounted on the head 11 according to the force that presses the piston 10 to move. The number of sealing rings 12 can be varied.

9 and 10, the piston 10 further includes a support ring 17 fitted to the head 11.

The support ring 17 is composed of a cylindrical portion 171 fitted in the head portion 11 and a disk portion 172 disposed at one end of the cylindrical portion 171.

With the configuration of the support ring 17 as described above, the support ring 17 forms a set with the sealing ring 12 and is fitted into the head portion 11, so that the tip of the cylindrical portion 171 is a rubber ring 120 ) Is in close contact with the disc portion 121 of the disc, and the disc portion 172 is in close contact with the bent portion 123 of the rubber ring 120.

As a result, as shown in FIG. 9, a space 18 is formed between the support ring 17 and the rubber ring 12, and the space 18 is filled with lubricating oil such as grease. When the space part 18 is filled with lubricating oil, the cylindrical part 171 of the support ring 17 and the disk part 121 of the rubber ring 120 are sealed so that the lubricating oil does not leak. .

Referring to FIG. 11, the support ring 17 is equipped with a protective ring 175 around the disk portion 172.

The protection ring 175 is for preventing the disk portion 172 from being scratched or worn by the disk portion 172 by contacting the inner circumferential surface of the cylinder 20.

Referring to FIG. 12, a mounting groove 132 is formed around the cover cap 13, and an iron core ring 134 is mounted in the mounting groove 132.

The iron core ring 133 is for preventing the protection ring 175 and the rubber ring 120 from being damaged by a solid material such as stone or sand or a metal material during the pumping process, and the outer diameter d5 is the rubber ring 120 ) Is formed smaller than the outer diameter (d3).

Reference numeral U1 of FIG. 12 is a difference between the outer diameter d5 of the iron core ring 133 and the outer diameter d3 of the rubber ring 120.

13, the cylinder 20 has a guide inclined portion 23 formed at one end to which the piston 10 is fitted, and when the piston 10 is fitted, the piston ( The sealing ring 12 of 10) is compressed smoothly.

14, the piston pump according to the present invention is a multistage piston pump, a plurality of gear cam members 50 in the inside of the gearbox 40; 50-1, 50-2,.... , 50-n) are arranged in a vertical line, and the power of the motor 60 is a first gear disposed at the top of the plurality of gear cam members 50 through the power transmission means 70; see FIGS. 17 and 18 The first gear cam member disposed on the top by being transmitted to the cam member 50-1 and interlocking with a plurality of gear cam members 50-1,...., 50-n arranged in a vertical line. The power of (50-1) is transmitted to the gear cam member (50-n) disposed at the lowermost portion, and a plurality of cylinders (20; 20-1, 20-2, ...) on either side of the gear box (40). ..,20-n) is arranged in a one-to-one correspondence with the gear cam member 50, and each gear cam member 50; 50-1, 50-2,...., 50-n) and the cylinder 20 ; 20-1, 20-2,...., 20-n) of the piston (10; 10-1, 10-2,...., 10-n) connecting rod (31; 31-1, 31-2,....,31-n) are connected respectively.

In the multi-stage piston pump according to the present invention configured as described above, the power of the motor 60 is respectively driven by the plurality of gear cam members 50; 50-1, 50-2,...., 50-n. 10; 10-1, 10-2,....10-n) is uniformly transmitted, and each gear cam member (50; 50-1, 50-2,...., 50-n) As rotation has a phase difference, fluid can be uniformly discharged from each cylinder (20-1, 20-2,...., 20-n), and low-power drive rotation can be performed, thereby saving energy. There is an advantage that can be achieved, and the pumping capacity increases as the number of cylinders 20-1, 20-2,..., 20-n increases.

15 and 16, in the multistage piston pump, the gear cam member 50 is a gear 51 and a cam member 52 are coupled, the first to the first to the cam member 52. 3 Connection holes 53-1, 53-2, 53-3 are formed, and the distance L1 between the rotation center O1 and the first connection hole 53-1 is the rotation center O1 and the second The distance (L2) between the connection hole (53-2) is larger than the distance (L2) between the rotation center (O1) and the second connection hole (53-2) is the rotation center (O1) and the third connection hole (53). -3) greater than the interval (L3).

Thereby, when one end of the connecting rod 31 is connected to the first connection hole 53-1 and the other end of the connecting rod 31 is connected to the piston 10, the piston 10 is the cylinder 20 Has the longest first stroke distance (S1), when one end of the connecting rod 31 is connected to the second connection hole 53-2, and the other end of the connecting rod 31 is connected to the piston 10, The piston 10 has a second stroke distance (S2) shorter than the first stroke distance (S1) in the cylinder 20, and one end of the connecting rod 31 is connected to the third connection hole 53-3, When the other end of the connecting rod 31 is connected to the piston 10, the piston 10 has a third stroke distance S3 shorter than the second stroke distance S2 in the cylinder 20.

As described above, the gear cam member 50 connects the connecting rod 31 to one of the first to third connection holes 53-1, 53-2, and 53-3, and the piston 10 It is possible to adjust the stroke distance of the piston 10, by adjusting the stroke distance of the piston 10, it is possible to adjust the pumping amount of the cylinder 20 once by the piston (10).

Referring again to FIGS. 17 and 18, in the multi-stage piston pump, the power transmission means 70 is a drive gear on the drive shaft 61 of the motor 60 mounted on the upper surface of the gearbox 40. 71), a first electric gear 72 engaged with the driving gear 71, a second electric gear 74 mounted on the same shaft 73 as the first electric gear 72, and a second electric gear It is composed of a driven gear 75 meshing with 74, and the driven gear 75 is mounted on the same shaft 76 as the first gear cam member 50-1 disposed inside the gear box 40. .

Thereby, the rotational power of the motor 60 is transmitted to the first electric gear 72 through the drive gear 71, and the rotation of the first electric gear 72 causes the first electric gear 72 and The second electric gear 74 mounted on the same shaft 73 rotates, and the rotation of the second electric gear 74 is transmitted to the driven gear 75, and driven by the rotation of the driven gear 75 The first gear cam member 50-1 mounted on the shaft 76 such as the gear 75 rotates.

Referring to FIG. 19, FIG. 19 shows a two-stage piston pump having two gear cam members 50-1 and 50-2 and two cylinders 20-1 and 20-2-as a first embodiment. As shown, the two first gear cam members 50-1 and the second gear cam members 50-2 are arranged up and down inside the gearbox 40, and the power of the motor 60 transmits power. It is transmitted to the first gear cam member 50-1 through means 70 (see FIGS. 17 and 18), and the first gear cam member 50-1 and the second gear cam member 50-2 are By engaging and interlocking, the power of the first gear cam member 50-1 is transmitted to the second gear cam member 50-2, and the first and second cylinders 20- on either side of the gear box 40 1, 20-2) are arranged in a one-to-one correspondence with the first and second gear cam members 50-1 and 50-2, and the first gear cam member 50-1 and the first cylinder 20-1 The first piston (10-1) is connected by the connecting rod (31-1), the second gear cam member (50-2) and the second piston (10-2) of the second cylinder (20-2) It is connected by this connecting rod 31-2.

The operation of the two-stage piston pump configured as described above will be described with reference to FIGS. 20 to 23.

The first gear cam member 50-1 and the second gear cam member 50-2 are meshed and interlocked with each other, so that as shown in FIG. 20, the first gear cam member 50-1 is indicated by an arrow 55 When rotating in the clockwise direction, the second gear cam member 50-2 rotates in the counterclockwise direction in the direction of the arrow 56.

FIG. 20 shows a state in which the first cylinder 20-1 is discharged and suction of the second cylinder 20-2 is completed.

Thereafter, when the first gear cam member 50-1 is rotated 90 degrees in the clockwise direction, the state of FIG. 20 to FIG. 21 is obtained. That is, when the first gear cam member 50-1 rotates 90 degrees in the clockwise direction, the first cylinder 20 connected by the first gear cam member 50-1 and the first connecting rod 31-1 As the first piston 10-1 of -1) retreats in the direction of the arrow 19a of FIG. 21, the pumped material is sucked into the first cylinder 20-1. At this time, when the first gear cam member 50-1 is rotated 90 degrees in the counterclockwise direction, the second gear cam member 50-2 is rotated 90 degrees in the counterclockwise direction, so that the second gear cam member ( As the second piston 10-2 of the second cylinder 20-2 connected by the 50-2) and the second connecting rod 31-2 advances in the direction of the arrow 19b in FIG. 21, the second cylinder The pumped material of (10-2) is discharged.

Thereafter, in FIG. 21, the state of FIG. 22 is established. 22 shows a state in which suction is completed in the first cylinder 20-1 and discharge is completed in the second cylinder 20-2.

That is, when the first gear cam member 50-1 is further rotated 90 degrees in the clockwise direction and is positioned at a position of 180 degrees, the first gear cam member 50-1 and the first connecting rod 31-1 As the first piston 10-1 of the first cylinder 20-1 connected by) retreats further in the direction of the arrow 19a of FIG. 22, the pumped material is sucked into the inside of the first cylinder 20-1. Is completed. At this time, the second gear cam member 50-2 is rotated 90 degrees counterclockwise and is positioned at the 0 degree position, so that the second gear cam member 50-2 and the second connecting rod 31- As the second piston 10-2 of the second cylinder 20-2 connected by 2) advances further in the direction of the arrow 19b in FIG. 22, the discharge of the pumped material from the second cylinder 10-2 is completed. do.

Thereafter, when the first gear cam member 50-1 is rotated 90 degrees in the clockwise direction, the state of FIGS. 22 to 23 is obtained. That is, when the first gear cam member 50-1 further rotates 90 degrees in the clockwise direction, the first cylinder connected by the first gear cam member 50-1 and the first connecting rod 31-1 ( As the first piston 10-1 of 20-1) advances in the direction of the arrow 19c of FIG. 23, the fluid inside the first cylinder 20-1 is discharged.

At this time, the second gear cam member 50-2 interlocking with the first gear cam member 50-1 rotates 90 degrees counterclockwise and is positioned at a position of 270 degrees, so that the second gear cam member The second piston (10-2) of the second cylinder (20-2) connected by the (50-2) and the second connecting rod (31-2) retreats in the direction of the arrow (19d) of FIG. The fluid is sucked into the cylinder 10-2.

Thereafter, when the first gear cam member 50-1 is further rotated 90 degrees in the clockwise direction, the piston moves to the initial position in the state of FIG. 23 to 20.

That is, when the first gear cam member 50-1 is further rotated 90 degrees in the clockwise direction and is positioned at the initial position of 0 degrees, the first gear cam member 50-1 and the first connecting rod ( As the first piston 10-1 of the first cylinder 20-1 connected by 31-1) advances further in the 0 degree direction, the fluid discharge of the first cylinder 20-1 is completed. At this time, the second gear cam member 50-2 rotates 90 degrees in the counterclockwise direction and is positioned at the initial position 180 degrees, so that the second gear cam member 50-2 and the second connecting rod As the second piston (10-2) of the second cylinder (20-2) connected by (31-2) advances further in the 180-degree direction, the suction of the fluid into the second cylinder (10-2) is completed. do.

As described above, in the two-stage piston pump according to the present invention, the first gear cam member 50-1 and the second gear cam member 50-2 have a phase difference of 180 degrees, so that the fluid in the first cylinder 20-1 In the process of inhaling, the second cylinder 20-2 is a process of discharging the fluid, and conversely, in the process of discharging the fluid from the first cylinder 20-1, the second cylinder 20-2 ) Is the process of inhaling fluid.

Referring to FIG. 24, in addition, in the two-stage piston pump as described above, the first and second pistons 10-1 and 10-2 have a radius r2 from the center O2 to the upper end. ) Is smaller than the radius r1 from the side to the side, and the radius r3 from the center O2 to the bottom is smaller than the radius R1 from the center O2 to the side.

Thereby, as in FIGS. 21 and 23, in a state in which the first and second gear cam members 50-1 and 50-2 are positioned at 90 and 270 degrees, the first and second connecting rods 31 When -1, 31-2) pushes or pulls the first and second pistons 10-1, 10-2 in the diagonal direction, the first and second pistons 10-1, 10- 2) The upper and lower ends of the inner circumferential surfaces of the first and second cylinders 20-1 and 20-2 pressurize the upper and lower ends more than the side ends, It prevents more severe wear on the lower end.

As a second embodiment, referring to FIG. 25, FIG. 25 shows three gear cam members 50-1, 50-2, 50-3 and three cylinders 20-1, 20-2, 20-3. It shows a three-stage piston pump having a gearbox 40, the three first gear cam member 50-1, the second gear cam member 50-2, and the third gear cam member 50 -3) is arranged vertically, and the power of the motor 60 is transmitted to the first gear cam member 50-1 through the power transmission means 70, and the first gear cam member 50-1 and the first 2 The gear cam members 50-2 are meshed and interlocked, and the second gear cam member 50-2 and the third gear cam member 50-3 are meshed and interlocked, so that the first gear cam member 50- The power of 1) is transmitted to the third gear cam member 50-3 through the second gear cam member 50-2, and the first to third cylinders 20- on either side of the gear box 40 1, 20-2, 20-3) are arranged in a one-to-one correspondence with the first to third gear cam members 50-1, 50-2, 50-3, and the first gear cam member 50-1 The first piston (10-1) of the first cylinder (20-1) is connected by the connecting rod (31-1), and the second gear cam member (50-2) and the second cylinder (20-1) The second piston (10-2) is connected by the connecting rod (31-2), the third gear cam member (50-3) and the third piston (10-3) of the third cylinder (20-3) It is connected by a connecting rod 31-3.

In the three-stage piston pump as described above, the first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 120 degrees, and the second gear The cam member 50-2 and the third gear cam member 50-3 rotate in opposite directions and have a phase difference of 120 degrees.

As a third embodiment, referring to FIG. 26, FIG. 26 shows four gear cam members 50-1, 50-2, 50-3, and 50-4 and four cylinders 20-1, 20-2, and 20-3, 20-4) showing a four-stage piston pump, the inside of the gearbox 40, four first gear cam member (50-1), the second gear cam member (50-2) , The third gear cam member 50-3 and the fourth gear cam member 50-4 are arranged vertically, and the power of the motor 60 is transmitted through the power transmission means 70 to the first gear cam member 50 -1), the first gear cam member 50-1 and the second gear cam member 50-2 are interlocked and interlocked, and the second gear cam member 50-2 and the third gear cam member (50-3) is meshed and interlocked, and the third gear cam member 50-3 and the fourth gear cam member 50-4 are meshed and interlocked, so that the power of the first gear cam member 50-1 It is transmitted to the fourth gear cam member 50-4 through the second gear cam member 50-2 and the third gear cam member 50-3, and the first To fourth cylinders (20-1, 20-2, 20-3, 20-4) correspond to the first to fourth gear cam members (50-1, 50-2, 50-3, 50-4) one-to-one The first gear cam member 50-1 and the first piston 10-1 of the first cylinder 20-1 are connected by a connecting rod 31-1, and the second gear cam member (50-2) and the second piston (10-2) of the second cylinder (20-1) is connected by a connecting rod (31-2), the third gear cam member (50-3) and the third cylinder The third piston (10-3) of (20-3) is connected by the connecting rod (31-3), and the fourth piston of the fourth gear cam member (50-4) and the fourth cylinder (20-4) (10-4) is connected by a connecting rod (31-4).

In the four-stage piston pump as described above, the first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 90 degrees, and the second gear The cam member 50-2 and the third gear cam member 50-3 rotate in opposite directions and have a phase difference of 90 degrees, and the third gear cam member 50-3 and the fourth gear cam member ( 50-4) rotates in opposite directions and has a phase difference of 90 degrees.

As a fourth embodiment, referring to FIG. 27, FIG. 27 shows five gear cam members 50-1, 50-2, 50-3, 50-4, 50-5 and five cylinders 20-1, 20-2, 20-3, 20-4, 20-5) showing a five-stage piston pump, in the inside of the gearbox 40, five first to fifth gear cam members 50-1, 50-2, 50-3, 50-4, 50-5) are arranged vertically, and the power of the motor 60 is transmitted to the first gear cam member 50-1 through the power transmission means 70 , The first gear cam member 50-1 and the second gear cam member 50-2 are meshed and interlocked, and the second gear cam member 50-2 and the third gear cam member 50-3 are meshed. The third gear cam member (50-3) and the fourth gear cam member (50-4) are interlocked and interlocked, and the fourth gear cam member (50-4) and the fifth gear cam member (50-5) Is interlocked and interlocked, so that the power of the first gear cam member 50-1 is transmitted through the second to fourth gear cam members 50-2, 50-3, and 50-4. ), and the first to fifth cylinders 20-1, 20-2, 20-3, 20-4, 20-5 on either side of the gear box 40 are the first to fourth gear cams It is arranged to correspond to the members 50-1, 50-2, 50-3, 50-4 one-to-one, and the first to fifth gear cam members 50-1, 50-2, 50-3, 50-4, 50-5) and the first to fifth pistons (10-1, 10-2, 10-3, 10-4, 10-5) are respectively connected to the connecting rods (31-1, 31-2, 31-3, 31-4, 31-5) respectively.

In the five-stage piston pump as described above, the first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 72 degrees, and the second gear The cam member 50-2 and the third gear cam member 50-3 rotate in opposite directions, have a phase difference of 72 degrees, and the third gear cam member 50-3 and the fourth gear cam member ( 50-4) rotates in opposite directions and has a phase difference of 72 degrees, and the fourth gear cam member 50-4 and the fifth gear cam member 50-5 rotate in opposite directions, and 72 Also has a phase difference.

Referring back to FIG. 14, FIG. 14 shows a six-stage piston pump having six gear cam members and a cylinder, and substituting 6 for n in the above description with reference to FIG. 14 results in a six-stage piston pump.

Referring to FIG. 28, further, the piston pump according to the present invention is a multistage double acting piston pump, in the multistage piston pump described with reference to FIG. 14, a plurality of double acting connected to the opposite side of the gearbox 40 Further comprising a cylinder (20a; 20a-1, 20a-2,...., 20a-n), the double acting cylinder (20a; 20a-1, 20a-2,...., 20a-n) is It is arranged on the opposite side of the cylinder 20; 20-1, 20-2,...., 20-n with the gearbox 40 as the center, and each gear cam member 50; 50-1, 50-2 ,...., 50-n) and the piston (10a; 10a-1, 10a-2,....) of the double-acting cylinder (20a; 20a-1, 20a-2,...., 20a-n). ,10a-n) are connected by auxiliary connecting rods (32; 32-1, 32-2,...., 32-n), respectively, and auxiliary connecting rods (32; 32-1, 32-2,. ..., 32-n) and the connecting rod (31; 31-1, 31-2,....., 31-n) and the gear cam member (50; 50-1, 50) in the opposite direction in a one-to-one correspondence -2, ...., 50-n).

Thereby, in the multi-stage double-acting piston pump according to the present invention, in the process of rotating the gear cam members 50; 50-1, 50-2, ...., 50-n, the double-acting cylinders 20a; 20a -1, 20a-2,...., 20a-n) of the piston (10a; 10a-1, 10a-2,....,10a-n) is the cylinder (20; 20-1, 20-2) ,....,20-n) of the piston (10; 10-1, 10-2,....., 10-n) and the opposite action. That is, when the piston 10 of the cylinder 20 is inhaled, the piston 10a of the double-acting cylinder 20a has a discharge function.

Referring to FIG. 29, the piston pump according to the present invention shown in FIG. 29 is a two-stage double-acting piston pump, and in the two-stage piston pump described with reference to FIG. 19 as a first embodiment, the gearbox 40 Further comprising two double-acting cylinders (20a; 20a-1, 20a-2) connected to the opposite side, the double-acting cylinder (20a; 20a-1, 20a-2) is a cylinder ( 20; is disposed on the opposite side of the 20-1, 20-2, each of the gear cam member (50; 50-1, 50-2) and the piston (10a) of the double-acting cylinder (20a; 20a-1, 20a-2) ; 10a-1 and 10a-2 are connected by auxiliary connecting rods 32; 32-1 and 32-2, respectively, and auxiliary connecting rods 32; 32-1 and 32-2 are connecting rods 31; It is connected to the gear cam member 50 (50-1, 50-2) in the opposite direction in a one-to-one correspondence with 31-1, 31-2).

Referring to FIG. 30, the piston pump according to the present invention shown in FIG. 30 is a three-stage double-acting piston pump, and in the three-stage piston pump described with reference to FIG. 25 as a second embodiment, the gearbox 40 Further comprising three double-acting cylinders (20a; 20a-1, 20a-2, 20a-3) connected to the opposite side, the double-acting cylinder (20a; 20a-1, 20a-2, 20a-3) is a gearbox Arranged on the opposite side of the cylinder (20; 20-1, 20-2, 20-3) centering on (40), and double acting with each gear cam member (50; 50-1, 50-2, 50-3) The piston (10a; 10a-1, 10a-2, 10a-3) of the cylinder (20a; 20a-1, 20a-2, 20a-3) is connected to the auxiliary connecting rod (32; 32-1, 32-2, 32- 3), and the auxiliary connecting rods (32; 32-1, 32-2, 32-3) are in opposite directions to correspond to the connecting rods (31; 31-1, 31-2, 31-3). It is connected to the gear cam member (50; 50-1, 50-2, 50-3).

Referring to FIG. 31, the piston pump according to the present invention shown in FIG. 31 is a four-stage double-acting piston pump, and in the fourth-stage piston pump described with reference to FIG. 26 as a third embodiment, the gearbox 40 Further comprising four double-acting cylinders (20a; 20a-1, 20a-2, 20a-3, 20a-4) connected to the opposite side, the double-acting cylinder (20a; 20a-1, 20a-2, 20a-3) , 20a-4) is disposed on the opposite side of the cylinder 20; 20-1, 20-2, 20-3, 20-4 with the gearbox 40 as the center, and each gear cam member 50; 50- 1, 50-2, 50-3, 50-4) and the piston (10a; 10a-1, 10a-2, 10a) of the double acting cylinder (20a; 20a-1, 20a-2, 20a-3, 20a-4) -3, 10a-4) are connected by auxiliary connecting rods (32; 32-1, 32-2, 32-3, 32-4), respectively, and auxiliary connecting rods (32; 32-1, 32-2, 32-3, 32-4) and the connecting rod (31; 31-1, 31-2, 31-3, 31-4) in a one-to-one correspondence with the gear cam member (50; 50-1, 50-2) in the opposite direction , 50-3, 50-4).

Referring to FIG. 32, the piston pump according to the present invention shown in FIG. 32 is a four-stage double-acting piston pump, and in the five-stage piston pump described with reference to FIG. 27 as a third embodiment, the gearbox 40 Further comprising five double-acting cylinders (20a; 20a-1, 20a-2, 20a-3, 20a-4, 20a-5) connected to the opposite side, the double-acting cylinder (20a; 20a-1, 20a-2) , 20a-3, 20a-4, 20a-5) are placed on the opposite side of the cylinder (20; 20-1, 20-2, 20-3, 20-4, 20-5) centered on the gearbox (40) And each gear cam member (50; 50-1, 50-2, 50-3, 50-4, 50-5) and double acting cylinder (20a; 20a-1, 20a-2, 20a-3, 20a-) 4, 20a-5) of the piston (10a; 10a-1, 10a-2, 10a-3, 10a-4, 10a-5) auxiliary connecting rod (32; 32-1, 32-2, 32-3, 32-4, 32-5), respectively, and auxiliary connecting rods (32; 32-1, 32-2, 32-3, 32-4, 32-5) are connected by connecting rods (31; 31-1, 31-2, 31-3, 31-4, 31-5) to the gear cam member (50; 50-1, 50-2, 50-3, 50-4, 50-5) in the opposite direction in a one-to-one correspondence. Connected.

33 to 35, the piston pump according to the present invention shown in FIGS. 33 to 35 is another form of a multi-stage double-acting piston pump, and a first gear cam member group 50c inside the gear box 40 ) Of the gear cam members 50c-1, 50c-2,..., 50c-n and the gear cam members 50d-1, 50d-2, ... of the second gear cam member group 50d. ., 50d-n) are arranged to face each other, and cylinders 20c-1, 20c-2, ...., 20c-n of the first cylinder group 20c on either side of the gearbox 40 And the cylinders 20d-1, 20d-2, ...., 20d-n of the second cylinder group 20d are arranged in two rows, and the cylinders 20c-1, 20c of the first cylinder group 20c -2,...., 20c-n) and the gear cam members 50c-1, 50c-2, ...., 50c-n of the first gear cam member group 50c are arranged in a one-to-one correspondence, , Cylinders 20d-1, 20d-2, ...., 20d-n of the second cylinder group 20d and gear cam members 50d-1, 50d-2 of the second gear cam member group 50d ,...., 50d-n) are arranged in a one-to-one correspondence, and a first motor 60c and a second motor 60d are respectively disposed on the upper surface of the gearbox 40, and the first motor 60c The power of the first gear cam member (50c; 50c-1, 50c-2, ...., 50c-n) through the first power transmission means (70c) the uppermost gear cam member (50c) disposed at the top -1), the gear cam members 50c-1, 50c-2, ...., 50c-n of the first gear cam member group 50c are engaged with each other and interlocked, so that the uppermost gear cam member 50c The power of -1) is transmitted to the lowermost gear cam member 50c-n disposed at the lowermost portion, and the power of the second motor 60d is transmitted to the second gear cam member group 50d through the second power transmission means 70d. ; 50d-1, 50d-2,...., 50d-n) is transmitted to the uppermost gear cam member (50d-1) disposed at the top, and the second gear cam The gear cam members 50d-1, 50d-2, ...., 50d-n of the member group 50d are meshed and interlocked with each other, so that the power of the uppermost gear cam member 50d-1 is disposed at the lowermost part. It is transmitted to the gear cam member 50d-n, and the gear cam members 50c-1, 50c-2, ...., 50c-n of the first gear cam member group 50c and the first cylinder group 20c ) Of the piston (10c; 10c-1, 10c-2,...., 10c-n) by the connecting rods 31c-1, 31c-2,...., 31c-n of the first connecting rod group 31c, respectively Connected, the gear cam members 50d-1, 50d-2,...., 50d-n of the second gear cam member group 50d and the pistons 10d-1, 10d of the second cylinder group 20d -2,...., 10d-n) are connected by connecting rods 31d-1, 31d-2, ...., 31d-n of the second connecting rod group 31d, respectively.

The multi-stage double-acting piston pump according to the present invention configured as described above can operate in both groups depending on the capacity to be pumped, or only the other group can operate in a state in which the operation of one group is stopped. The operation is the same as that of the multistage piston pump described with reference to FIG. 14.

36 to 38, as another form of the two-stage double-acting piston pump according to the present invention shown in FIGS. 36 to 38, right first and second gear cam members 50c inside the gear box 40 -1, 50c-2) and the left first and second gear cam members 50d-1 and 50d-2 are arranged to face each other, and left first and second cylinders on either side of the gearbox 40 (20c-1, 20c-2) and the right first and second cylinders (20d-1, 20d-2) are arranged in two rows, the left first and second cylinders (20c-1, 20c-2) and the left first cylinder The first and second gear cam members 50c-1 and 50c-2 are arranged in a one-to-one correspondence, the right first and second cylinders 20d-1 and 20d-2 and the right first and second gear cam members ( 50d-1 and 50d-2) are arranged in a one-to-one correspondence, and the first motor 60c and the second motor 60d are respectively disposed on the upper surface of the gearbox 40, and the power of the first motor 60c It is transmitted to the right first gear cam member gear cam member 50c-1 through the first power transmission means 70c, and the right first gear cam member 50c-1 and the right second gear cam member 50c- 2) are interlocked with each other so that the power of the right first gear cam member 50c-1 is transmitted to the right second gear cam member 50c-2, and the power of the second motor 60d is the second power transmission means It is transmitted to the left first gear cam member 50d-1 through (70d), the left first gear cam member 50d-1 and the left second gear cam member 50d-2 are interlocked with each other, 1 The power of the gear cam member 50d-1 is transmitted to the left second gear cam member 50d-2, the right first and second gear cam members 50c-1 and 50c-2 and the right first and The first pistons 10c-1 and 10c-2 are connected by the right first and second connecting rods 31c-1 and 31c-2, respectively, and the left first and second gear cam members 50d-1 and 50d -2) and the left first and second pistons (10d-1, 10d- 2) are connected by left first and second connecting rods 31d-1 and 31d-2, respectively.

39 to 41, the piston pump according to the present invention shown in FIGS. 39 to 41 is another form of a three-stage double-acting piston pump, in which a first gear cam member group ( The first to third gear cam members 50c-1, 50c-2, 50c-3 of 50c) and the first to third gear cam members 50d-1, 50d of the second gear cam member group 50d -2, 50d-3) are arranged to face each other, and the first to third cylinders 20c-1, 20c-2, 20c-3 of the first cylinder group 20c on either side of the gearbox 40 ) And the first to third cylinders 20d-1, 20d-2, and 20d-3 of the second cylinder group 20d are arranged in two rows, and the first to third cylinders of the first cylinder group 20c (20c-1, 20c-2, 20c-3) and the first to third gear cam members 50c-1, 50c-2, 50c-d of the first gear cam member group 50c are arranged in a one-to-one correspondence The first to third cylinders 20d-1, 20d-2, 20d-3 of the second cylinder group 20d and the first to third gear cam members 50d of the second gear cam member group 50d -1, 50d-2, 50d-3) are arranged in a one-to-one correspondence, and a first motor 60c and a second motor 60d are respectively disposed on the upper surface of the gearbox 40, and the first motor 60c ) Through the first power transmission means (70c), the first gear cam member (50c; 50c-1, 50c-2, 50c-3) of the first gear cam member (50c-1) And the gear cam members 50c-1, 50c-2, ...., 50c-n of the first gear cam member group 50c are engaged with each other and interlocked, so that the first gear cam member 50c-1 ) Power is transmitted to the second gear cam member 50c-3 disposed at the lowermost portion, and the power of the second motor 60d is transmitted to the second gear cam member group 50d through the second power transmission means 70d; 50d-1, 50d-2, 50d-3) It is transmitted to the arranged first gear cam member 50d-1, and the first to third gear cam members 50d-1, 50d-2, 50d-3 of the second gear cam member group 50d are engaged with each other. By interlocking, the power of the first gear cam member 50d-1 is transmitted to the third gear cam member 50d-3 disposed at the bottom, and the first to third gears of the first gear cam member group 50c First to third pistons 10c of the cam members 50c-1, 50c-2, 50c-3 and the first cylinder group 20c; 10c-1, 10c-2, 10c-3) are connected by connecting rods 31c-1, 31c-2,...., 31c-n of the first connecting rod group 31c, respectively, and the second The first to third gear cam members 50d-1, 50d-2, 50d-3 of the gear cam member group 50d and the first to third pistons 10d-1, 10d of the second cylinder group 20d -2, 10d-3) are connected by connecting rods 31d-1, 31d-2, and 31d-3 of the second connecting rod group 31d, respectively.

42, FIG. 42 is a perspective view showing another form of a four-stage double-acting piston pump according to the present invention, and in another form of the three-stage double-acting piston pump described above, a gear cam member and a cylinder are further added one by one to the left and right. However, the construction and operation principle are the same as the three-stage double-acting piston pump.

Referring to FIG. 43, FIG. 43 is a perspective view showing another form of a five-stage double-acting piston pump according to the present invention, and in another form of the three-stage double-acting piston pump described above, a gear cam member and two cylinders are further left and right. It is only an addition, and the construction and operation principle are the same as the three-stage double-acting piston pump.

Claims

The piston 10 is inserted into the cylinder 20 in which the suction port 21 and the discharge port 22 are formed, and the piston 10 performs a reciprocating stroke motion in the cylinder 20 by the driving means 30, and the piston 10 In the piston pump that is discharged to the outside through the discharge port 22 after the fluid flows into the cylinder 20 through the suction port 21 by the reciprocating stroke motion of ),

The piston 10 has a plurality of sealing rings 12 fitted to the cylindrical head 11, and the cover cap 13 is mounted on the front end of the head 11 by bolts 14, sealing ring Piston pump, characterized in that (12) is disposed between the flange (112) of the head portion (11) and the cover cap (13).
The method of claim 1,

The sealing ring 12 is a piston pump, characterized in that consisting of a rubber ring 120 and a C ring 125 mounted in a mounting groove 124 formed around the rubber ring 120.
The method of claim 2,

The rubber ring 120 is formed with a bent portion 123 in the shape of a lattice around the disk portion 121 in which the center hole 122 is formed, and is mounted around the disk portion 121 by the bent portion 123 The groove 124 is formed, the C-ring 125 is mounted in the mounting groove 124,

The C-ring 125 is formed of a spring steel material, the piston pump, characterized in that the cutout 126 is formed.
The method of claim 3,

The C ring 125 has an outer diameter (d1) larger than the diameter (d2) of the mounting groove 124 of the rubber ring 120, and the C ring 125 is the mounting groove 124 of the rubber ring 120 When inserted, the rubber ring 120 expands by the C-ring 125, the outer diameter d3 of the rubber ring 120 increases, and the outer diameter d3 of the expanded rubber ring 120 is When the inner diameter (d4) of (20) becomes larger and the piston (10) is forcibly inserted into the cylinder (20), the C ring (125) is compressed, and the outer peripheral surface of the rubber ring (120) is Piston pump, characterized in that in close contact with the inner circumferential surface at a predetermined pressure.
The method of claim 4,

In the course of the piston 10 reciprocating within the cylinder 20, even if the outer peripheral surface of the rubber ring 120 is worn by friction with the inner peripheral surface of the cylinder 20, the outer peripheral surface of the rubber ring 120 A piston pump, characterized in that the C-ring 125 expands as much as it wears, and the rubber ring 120 is constantly in close contact with the inner circumferential surface of the cylinder 20 at the same pressure.
The method of claim 4,

The sealing ring 12 is selected differently the number of C-rings 125 fitted into the mounting grooves 124 of the rubber ring 120 according to the adhesion of the outer circumferential surface of the rubber ring 120 to the inner circumferential surface of the cylinder 20 Piston pump, characterized in that it can.
The method of claim 6,

C-ring 125 is a piston pump, characterized in that when two or more are mounted in the mounting groove 124 of the rubber ring 120, the cutouts 126 are arranged in different directions.
The method of claim 2,

The piston 10 has a plurality of sealing rings 12 mounted on the cylindrical head 11, and pressurizes the piston 10 to move when the piston 10 performs a reciprocating stroke motion in the cylinder 20. A piston pump, characterized in that the number of sealing rings 12 mounted on the head 11 is varied depending on the force.
The method of claim 2,

The piston 10 further includes a support ring 17 fitted to the head 11,

The support ring 17 is a piston pump, characterized in that consisting of a cylindrical portion 171 fitted to the head portion 11, and a disk portion 172 disposed at one end of the cylindrical portion 171.
The method of claim 9,

The support ring 17 is set with the sealing ring 12 and is fitted into the head part 11, so that the tip of the cylindrical part 171 is in close contact with the disc part 121 of the rubber ring 120, and the disc The part 172 is in close contact with the bent part 123 of the rubber ring 120, a space part 18 is formed between the support ring 17 and the rubber ring 12, and the space part 18 has a lubricant Piston pump, characterized in that the filling.
The method of claim 9,

The support ring (17) is a piston pump, characterized in that the protection ring (175) is mounted around the disk portion (172).
The method of claim 1,

The cover cap 13 is a piston pump, characterized in that a mounting groove 132 is formed around the periphery, and an iron core ring 134 is mounted in the mounting groove 132.
The method of claim 12,

The iron core ring 133 is for preventing the protection ring 175 and the rubber ring 120 from being damaged by a solid material or a metal material in the pumping process, and the outer diameter d5 is the outer diameter d3 of the rubber ring 120 Piston pump, characterized in that formed to be smaller.
The method of claim 1,

The cylinder 20 is a piston pump, characterized in that the guide inclined portion 23 is formed at one end to which the piston 10 is fitted.
A plurality of gear cam members (50; 50-1, 50-2,...., 50-n) are arranged in a vertical row inside the gearbox 40, and the power of the motor 60 is a power transmission means It is transmitted to the first gear cam member 50-1 disposed at the top of the plurality of gear cam members 50 through 70, and a plurality of gear cam members 50-1,... ., 50-n) are interlocked and interlocked, so that the power of the first gear cam member 50-1 disposed at the top is transmitted to the gear cam member 50-n disposed at the lowermost part, and the gear box 40 A plurality of cylinders (20; 20-1, 20-2, ...., 20-n) are arranged in a one-to-one correspondence to the gear cam member 50 on one side of the gear cam member 50, respectively; 50-1, 50-2,...., 50-n) and the piston of the cylinder (20; 20-1, 20-2,....,20-n) (10; 10-1, 10- 2,...., 10-n) is a piston pump, characterized in that connected by the connecting rod (31; 31-1, 31-2,...., 31-n) respectively.
The method of claim 15,

The gear cam member 50 is a gear 51 and a cam member 52 is coupled, the first to third connection holes 53-1, 53-2, 53-3 in the cam member 52 Is formed, the distance (L1) between the rotation center (O1) and the first connection hole (53-1) is larger than the gap (L2) between the rotation center (O1) and the second connection hole (53-2), and Piston pump, characterized in that the distance (L2) between the center (O1) and the second connection hole (53-2) is larger than the distance (L3) between the rotation center (O1) and the third connection hole (53-3) .
The method of claim 16,

When one end of the connecting rod 31 is connected to the first connection hole 53-1 and the other end of the connecting rod 31 is connected to the piston 10, the piston 10 is the longest in the cylinder 20. When it has a first stroke distance S1, one end of the connecting rod 31 is connected to the second connection hole 53-2, and the other end of the connecting rod 31 is connected to the piston 10, the piston 10 ) Has a second stroke distance (S2) shorter than the first stroke distance (S1) in the cylinder 20, one end of the connecting rod 31 is connected to the third connection hole 53-3, and the connecting rod ( When the other end of 31) is connected to the piston 10, the piston 10 is a piston pump, characterized in that it has a third stroke distance (S3) shorter than the second stroke distance (S2) in the cylinder (20).
The method of claim 15,

The power transmission means 70 includes a drive gear 71 on the drive shaft 61 of the motor 60 mounted on the upper surface of the gearbox 40, and a first electric gear 72 meshed with the drive gear 71. ), and a second electric gear 74 mounted on the same shaft 73 as the first electric gear 72, and a driven gear 75 meshing with the second electric gear 74, and a driven gear ( A piston pump, characterized in that 75 is mounted on the same shaft 76 as the first gear cam member 50-1 disposed inside the gear box 40.
The two first gear cam members 50-1 and the second gear cam members 50-2 are arranged up and down inside the gearbox 40, and the power of the motor 60 is the power transmission means 70 Is transmitted to the first gear cam member 50-1 through the first gear cam member 50-1, and the first gear cam member 50-1 and the second gear cam member 50-2 are interlocked and interlocked with each other, so that the first gear cam member 50 The power of -1) is transmitted to the second gear cam member 50-2, and the first and second cylinders 20-1 and 20-2 are provided on either side of the gear box 40. 2 It is arranged in a one-to-one correspondence with the gear cam members 50-1 and 50-2, and the first gear cam member 50-1 and the first piston 10-1 of the first cylinder 20-1 are connected. It is connected by the rod 31-1, and the second gear cam member 50-2 and the second piston 10-2 of the second cylinder 20-2 are connected by a connecting rod 31-2. Piston pump, characterized in that the.
The method of claim 19,

The first gear cam member (50-1) and the second gear cam member (50-2) are rotated in opposite directions to each other, the piston pump, characterized in that they have a phase difference of 180 degrees.
The method of claim 19,

The first and second pistons 10-1 and 10-2 have a radius r2 from the center (O2) to the top that is smaller than the radius (r1) from the center (O2) to the side, and at the center (O2) Piston pump, characterized in that the radius to the bottom (r3) is formed in an elliptical shape smaller than the radius (R1) from the center (O2) to the side.
The three first gear cam members 50-1, the second gear cam members 50-2, and the third gear cam members 50-3 are arranged vertically inside the gearbox 40, and the motor ( The power of 60) is transmitted to the first gear cam member 50-1 through the power transmission means 70, and the first gear cam member 50-1 and the second gear cam member 50-2 are The second gear cam member 50-2 and the third gear cam member 50-3 are meshed and interlocked, so that the power of the first gear cam member 50-1 is applied to the second gear cam member ( 50-2) is transmitted to the third gear cam member 50-3, and the first to third cylinders 20-1, 20-2, 20-3 are on either side of the gear box 40 It is arranged to correspond to the first to third gear cam members 50-1, 50-2, 50-3 one-to-one, and the first gear cam member 50-1 and the first cylinder 20-1 The piston (10-1) is connected by the connecting rod (31-1), and the second gear cam member (50-2) and the second piston (10-2) of the second cylinder (20-1) are connected to the connecting rod. It is connected by (31-2), the third gear cam member (50-3) and the third piston (10-3) of the third cylinder (20-3) is connected by the connecting rod (31-3). Piston pump, characterized in that.
The method of claim 22,

The first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 120 degrees, and the second gear cam member 50-2 and the third The gear cam member 50-3 rotates in opposite directions to each other and has a phase difference of 120 degrees.
Inside the gearbox 40, the four first gear cam members 50-1, the second gear cam members 50-2, the third gear cam members 50-3, and the fourth gear cam members 50 -4) is arranged vertically, and the power of the motor 60 is transmitted to the first gear cam member 50-1 through the power transmission means 70, and the first gear cam member 50-1 and the first 2 The gear cam members 50-2 are meshed and interlocked, the second gear cam member 50-2 and the third gear cam member 50-3 are meshed and interlocked, and the third gear cam member 50- 3) and the fourth gear cam member 50-4 are meshed and interlocked, so that the power of the first gear cam member 50-1 is applied to the second gear cam member 50-2 and the third gear cam member 50 It is transmitted to the fourth gear cam member 50-4 through -3), and the first to fourth cylinders 20-1, 20-2, 20-3, 20- on either side of the gear box 40 4) are arranged in a one-to-one correspondence with the first to fourth gear cam members 50-1, 50-2, 50-3, 50-4, and the first gear cam member 50-1 and the first cylinder ( The first piston 10-1 of 20-1) is connected by the connecting rod 31-1, and the second gear cam member 50-2 and the second piston of the second cylinder 20-1 ( 10-2) is connected by the connecting rod 31-2, and the third gear cam member 50-3 and the third piston 10-3 of the third cylinder 20-3 are connected to the connecting rod 31 -3), characterized in that the fourth gear cam member (50-4) and the fourth piston (10-4) of the fourth cylinder (20-4) are connected by a connecting rod (31-4) Piston pump made with.
The method of claim 24,

The first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 90 degrees, and the second gear cam member 50-2 and the third The gear cam member 50-3 rotates in opposite directions and has a phase difference of 90 degrees, and the third gear cam member 50-3 and the fourth gear cam member 50-4 rotate in opposite directions. The piston pump, characterized in that it has a phase difference of 90 degrees.
Five first to fifth gear cam members 50-1, 50-2, 50-3, 50-4, 50-5 are arranged vertically inside the gearbox 40, and the motor 60 Power is transmitted to the first gear cam member 50-1 through the power transmission means 70, and the first gear cam member 50-1 and the second gear cam member 50-2 are engaged and interlocked, The second gear cam member 50-2 and the third gear cam member 50-3 are engaged and interlocked, and the third gear cam member 50-3 and the fourth gear cam member 50-4 are engaged and interlocked. And the fourth gear cam member 50-4 and the fifth gear cam member 50-5 are meshed and interlocked, so that the power of the first gear cam member 50-1 is applied to the second to fourth gear cam members ( It is transmitted to the fifth gear cam member 50-5 through the 50-2, 50-3, 50-4, and the first to fifth cylinders 20-1 and 20 on either side of the gear box 40 -2, 20-3, 20-4, 20-5) are arranged in a one-to-one correspondence with the first to fourth gear cam members 50-1, 50-2, 50-3, 50-4, and the first To fifth gear cam members 50-1, 50-2, 50-3, 50-4, 50-5 and first to fifth pistons 10-1, 10-2, 10-3, 10-4 , 10-5) is a piston pump, characterized in that each connected by the respective connecting rods (31-1, 31-2, 31-3, 31-4, 31-5).
The method of claim 26,

The first gear cam member 50-1 and the second gear cam member 50-2 rotate in opposite directions, have a phase difference of 72 degrees, and the second gear cam member 50-2 and the third The gear cam member 50-3 rotates in opposite directions and has a phase difference of 72 degrees, and the third gear cam member 50-3 and the fourth gear cam member 50-4 rotate in opposite directions. And has a phase difference of 72 degrees, the fourth gear cam member 50-4 and the fifth gear cam member 50-5 rotate in opposite directions to each other, and have a phase difference of 72 degrees .
The method of claim 19,

Further comprising a plurality of double-acting cylinders (20a; 20a-1, 20a-2, ...., 20a-n) connected to the opposite side of the gearbox 40, the double-acting cylinder (20a; 20a-1, 20a-2,...., 20a-n) are arranged on the opposite side of the cylinder (20; 20-1, 20-2,...., 20-n) around the gearbox 40, respectively Of the gear cam member (50; 50-1, 50-2,...., 50-n) and the piston of the double acting cylinder (20a; 20a-1, 20a-2,...., 20a-n) 10a; 10a-1, 10a-2,...., 10a-n) are connected by auxiliary connecting rods (32; 32-1, 32-2,...., 32-n) respectively, auxiliary The connecting rod (32; 32-1, 32-2,...., 32-n) and the connecting rod (31; 31-1, 31-2,....., 31-n) and one-to-one correspondence. Piston pump, characterized in that connected to the gear cam member (50; 50-1, 50-2, ...., 50-n) in the opposite direction.
The method of claim 19,

Further comprising two double-acting cylinders (20a; 20a-1, 20a-2) connected to the opposite side of the gearbox 40, the double-acting cylinder (20a; 20a-1, 20a-2) is a gearbox (40) ) Is disposed on the opposite side of the cylinder 20; 20-1, 20-2, and each gear cam member 50; 50-1, 50-2 and the double acting cylinder 20a; 20a-1, 20a- 2) The pistons (10a; 10a-1, 10a-2) are connected by auxiliary connecting rods (32; 32-1, 32-2), respectively, and auxiliary connecting rods (32; 32-1, 32-2) Piston pump, characterized in that connected to the gear cam member (50; 50-1, 50-2) in the opposite direction to correspond to the connecting rod (31; 31-1, 31-2) one-to-one.
The method of claim 22,

Further comprising three double-acting cylinders (20a; 20a-1, 20a-2, 20a-3) connected to the opposite side of the gearbox 40, the double-acting cylinder (20a; 20a-1, 20a-2, 20a) -3) is disposed on the opposite side of the cylinders 20; 20-1, 20-2, 20-3 around the gearbox 40, and each gear cam member 50; 50-1, 50-2, 50-3) and the pistons (10a; 10a-1, 10a-2, 10a-3) of the double acting cylinders (20a; 20a-1, 20a-2, 20a-3) are auxiliary connecting rods (32; 32-1, 32-2, 32-3), respectively, and auxiliary connecting rods (32; 32-1, 32-2, 32-3) are connecting rods (31; 31-1, 31-2, 31-3) Piston pump, characterized in that connected to the gear cam member (50; 50-1, 50-2, 50-3) in the opposite direction in a one-to-one correspondence with.
The method of claim 24,

Further comprising four double-acting cylinders (20a; 20a-1, 20a-2, 20a-3, 20a-4) connected to the opposite side of the gearbox 40, the double-acting cylinder (20a; 20a-1, 20a) -2, 20a-3, 20a-4) are arranged on the opposite side of the cylinder (20; 20-1, 20-2, 20-3, 20-4) centering on the gearbox 40, and each gear cam The piston (10a; 10a-1) of the member (50; 50-1, 50-2, 50-3, 50-4) and the double-acting cylinder (20a; 20a-1, 20a-2, 20a-3, 20a-4) , 10a-2, 10a-3, 10a-4) are connected by auxiliary connecting rods (32; 32-1, 32-2, 32-3, 32-4), respectively, and auxiliary connecting rods (32; 32- 1, 32-2, 32-3, 32-4) and the connecting rod (31; 31-1, 31-2, 31-3, 31-4) and the gear cam member (50; 50) in the opposite direction in a one-to-one correspondence -1, 50-2, 50-3, 50-4), characterized in that connected to the piston pump.
The method of claim 26,

Further comprising five double-acting cylinders (20a; 20a-1, 20a-2, 20a-3, 20a-4, 20a-5) connected to the opposite side of the gearbox 40, the double-acting cylinder (20a; 20a) -1, 20a-2, 20a-3, 20a-4, 20a-5) is the cylinder (20; 20-1, 20-2, 20-3, 20-4, 20-) around the gearbox (40). 5) is disposed on the opposite side of each gear cam member (50; 50-1, 50-2, 50-3, 50-4, 50-5) and the double acting cylinder (20a; 20a-1, 20a-2, The piston (10a; 10a-1, 10a-2, 10a-3, 10a-4, 10a-5) of the 20a-3, 20a-4, 20a-5) is connected to the auxiliary connecting rod (32; 32-1, 32- 2, 32-3, 32-4, 32-5) respectively, and auxiliary connecting rods (32; 32-1, 32-2, 32-3, 32-4, 32-5) are connected by connecting rods ( 31; 31-1, 31-2, 31-3, 31-4, 31-5) and the gear cam member in the opposite direction (50; 50-1, 50-2, 50-3, 50-4) The piston pump, characterized in that connected to 50-5).
The gear cam members 50c-1, 50c-2,..., 50c-n of the first gear cam member group 50c and the second gear cam member group 50d inside the gear box 40 The gear cam members 50d-1, 50d-2, ..., 50d-n are arranged to face each other, and the cylinder 20c of the first cylinder group 20c on either side of the gearbox 40 -1, 20c-2,...., 20c-n) and the cylinders 20d-1, 20d-2,...., 20d-n of the second cylinder group 20d are arranged in two rows , Cylinders 20c-1, 20c-2, ...., 20c-n of the first cylinder group 20c and gear cam members 50c-1, 50c-2 of the first gear cam member group 50c ,...., 50c-n) are arranged in a one-to-one correspondence, and the cylinders 20d-1, 20d-2,...., 20d-n of the second cylinder group 20d and the second gear cam member The gear cam members 50d-1, 50d-2, ...., 50d-n of the group 50d are arranged in a one-to-one correspondence, and the first motor 60c and the first motor 60c are disposed on the upper surface of the gearbox 40. Two motors (60d) are each disposed, and the power of the first motor (60c) is transmitted through the first power transmission means (70c) to the first gear cam member group (50c; 50c-1, 50c-2, .... , 50c-n), the gear cam members 50c-1, 50c-2, ...., transmitted to the uppermost gear cam member 50c-1 disposed at the top, and the gear cam members 50c-1, 50c-2, ...., of the first gear cam member group 50c. 50c-n) are interlocked and interlocked, so that the power of the uppermost gear cam member 50c-1 is transmitted to the lowermost gear cam member 50c-n disposed at the lowermost part, and the power of the second motor 60d is transmitted to the second Transmission through the power transmission means (70d) to the uppermost gear cam member (50d-1) disposed at the top of the second gear cam member group (50d; 50d-1, 50d-2,...., 50d-n) And the gear cam members 50d-1, 50d-2, ...., 50d-n of the second gear cam member group 50d are meshed and interlocked, so that the uppermost gear cam member 50d-1 ) Power is transmitted to the lowermost gear cam member 50d-n disposed at the lowermost part, and the gear cam members 50c-1, 50c-2, ...., 50c- of the first gear cam member group 50c. n) and the piston 10c of the first cylinder group 20c; 10c-1, 10c-2,...., 10c-n) by the connecting rods 31c-1, 31c-2,...., 31c-n of the first connecting rod group 31c, respectively Connected, the gear cam members 50d-1, 50d-2,...., 50d-n of the second gear cam member group 50d and the pistons 10d-1, 10d of the second cylinder group 20d -2,..., 10d-n) are connected by connecting rods 31d-1, 31d-2,...., 31d-n of the second connecting rod group 31d, respectively. Piston pump.
Inside the gear box 40, the right first and second gear cam members 50c-1 and 50c-2 and the left first and second gear cam members 50d-1 and 50d-2 are arranged to face each other. And, on either side of the gearbox 40, the left first and second cylinders 20c-1 and 20c-2 and the right first and second cylinders 20d-1 and 20d-2 are arranged in two rows, The left first and second cylinders 20c-1 and 20c-2 and the left first and second gear cam members 50c-1 and 50c-2 are arranged in a one-to-one correspondence, and the right first and second cylinders ( 20d-1, 20d-2) and the right first and second gear cam members 50d-1 and 50d-2 are arranged in a one-to-one correspondence, and the first motor 60c and the upper surface of the gearbox 40 The second motors 60d are respectively disposed, and the power of the first motor 60c is transmitted to the right first gear cam member 50c-1 through the first power transmission means 70c, and 1 The gear cam member 50c-1 and the right second gear cam member 50c-2 are interlocked with each other, so that the power of the right first gear cam member 50c-1 is applied to the right second gear cam member 50c-2. ), and the power of the second motor 60d is transmitted to the left first gear cam member 50d-1 through the second power transmission means 70d, and the left first gear cam member 50d-1 And the left second gear cam member 50d-2 are interlocked with each other, so that the power of the left first gear cam member 50d-1 is transmitted to the left second gear cam member 50d-2, and the right first and The second gear cam members 50c-1 and 50c-2 and the right first and second pistons 10c-1 and 10c-2 are connected by the right first and second connecting rods 31c-1 and 31c-2. Each connected, the left first and second gear cam members (50d-1, 50d-2) and the left first and second pistons (10d-1, 10d-2) are left first and second connecting rod (31d) Piston pump, characterized in that connected by each of -1, 31d-2).
The first to third gear cam members 50c-1, 50c-2, 50c-3 of the first gear cam member group 50c and the second gear cam member group 50d inside the gear box 40 The first to third gear cam members 50d-1, 50d-2, 50d-3 are disposed to face each other, and the first to third gear cam members 20c of the first cylinder group 20c are disposed on one side of the gearbox 40. The third cylinders 20c-1, 20c-2, 20c-3 and the first to third cylinders 20d-1, 20d-2, and 20d-3 of the second cylinder group 20d are arranged in two rows. , The first to third cylinders 20c-1, 20c-2, 20c-3 of the first cylinder group 20c and the first to third gear cam members 50c- of the first gear cam member group 50c 1, 50c-2, 50c-d) are arranged in a one-to-one correspondence, and the first to third cylinders 20d-1, 20d-2, 20d-3 of the second cylinder group 20d and the second gear cam member The first to third gear cam members 50d-1, 50d-2, and 50d-3 of the group 50d are arranged in a one-to-one correspondence, and the first motor 60c and the first motor 60c are arranged on the upper surface of the gearbox 40. 2 Motors (60d) are each disposed, the power of the first motor (60c) is through the first power transmission means (70c) the first gear cam member group (50c; 50c-1, 50c-2, 50c-3) It is transmitted to the first gear cam member 50c-1 disposed at the top of the gear cam members 50c-1, 50c-2, ...., 50c-n of the first gear cam member group 50c By interlocking and interlocking with each other, the power of the first gear cam member 50c-1 is transmitted to the second gear cam member 50c-3 disposed at the bottom, and the power of the second motor 60d transmits the second power. It is transmitted to the first gear cam member 50d-1 disposed at the top of the second gear cam member group 50d; 50d-1, 50d-2, 50d-3 through the means 70d, and the second gear cam The first to third gear cam members 50d-1 and 50d-2 of the member group 50d , 50d-3 are interlocked and interlocked with each other, so that the power of the first gear cam member 50d-1 is transmitted to the third gear cam member 50d-3 disposed at the lowermost portion, and the first gear cam member group 50c ) Of the first to third gear cam members 50c-1, 50c-2, 50c-3 and the first to third pistons 10c of the first cylinder group 20c; 10c-1, 10c-2, 10c-3) are connected by connecting rods 31c-1, 31c-2,...., 31c-n of the first connecting rod group 31c, respectively, and the second The first to third gear cam members 50d-1, 50d-2, 50d-3 of the gear cam member group 50d and the first to third pistons 10d-1, 10d of the second cylinder group 20d -2, 10d-3) are connected by connecting rods 31d-1, 31d-2, 31d-3 of the second connecting rod group 31d, respectively.