KR20160083386A - Double Rows Phase Displacement type External Gear Pump and Hydraulic System thereby - Google Patents

Double Rows Phase Displacement type External Gear Pump and Hydraulic System thereby Download PDF

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Publication number
KR20160083386A
KR20160083386A KR1020140194448A KR20140194448A KR20160083386A KR 20160083386 A KR20160083386 A KR 20160083386A KR 1020140194448 A KR1020140194448 A KR 1020140194448A KR 20140194448 A KR20140194448 A KR 20140194448A KR 20160083386 A KR20160083386 A KR 20160083386A
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KR
South Korea
Prior art keywords
housing
shaft
drive shaft
gear pump
gear
Prior art date
Application number
KR1020140194448A
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Korean (ko)
Inventor
이재열
정구봉
최영호
최재연
홍성호
이종득
Original Assignee
한국로봇융합연구원
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Priority to KR1020140194448A priority Critical patent/KR20160083386A/en
Publication of KR20160083386A publication Critical patent/KR20160083386A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

A hydraulic system of the present invention includes: a double-rows phase shifting type external gear pump (100) composed of a main driving shaft (3) with a pair of driving gears (3-1, 3-2) forming a gear teeth phase difference (P_angle) in front and rear part of an internal space of a housing (1) covered by a front cover (2) and a pair of driven shafts (4, 5) arranged in double rows to be engaged with the pair of the driving gears (3-1, 3-2); a motor transmitting torque to the main driving shaft (3); a working fluid intake line (200-5) capable of sucking the working fluid into the internal space using a negative pressure of the internal space of the housing (1); and a working fluid discharge line (200-9) discharging the high-pressure working fluid inside the internal space of the housing (1) to the outside. Accordingly, the double-rows phase shifting type external gear pump is capable of autonomously reducing pulsation without additional devices in a hydraulic circuit. In addition, the hydraulic system (200) is capable of not only increasing a discharge amount of the working fluid without a decrease while having excellent pulsation reducing efficiency, but also improving safety and control performance.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a double-row phase shift type external gear pump,

The present invention relates to an external gear pump, and more particularly, to a double-phase phase displacement type external gear pump capable of minimizing the difference in flow rate during rotation while increasing the discharge flow rate with pulsation reduction, and a hydraulic system using the same.

Generally, the gear pump is composed of a pair of driven and rotated gears, a gear housing accommodating a pair of gears, and a flow passage penetrating the gear housing at both of the meshing positions of the pair of gears for the suction and discharge of the hydraulic oil. Therefore, such a gear pump has an output characteristic capable of high-speed flow rate and high-pressure output with stable discharge pressure as compared with other types of pumps.

In particular, the external gear pump of these gear pumps is mainly applied to the hydraulic system because of the structural simplicity in which the drive and station gear pairs are circumscribed with each other and the applicable speed range is high. However, due to the structural characteristics of the external gear pump, There is a drawback in that the life of the hydraulic system is shortened due to not only the pulsation of the output hydraulic pressure but also noise and vibration.

As a result, the external gear pump can be used for additional mounting of relief grooves, optimum design of external gear pump teeth, separate pressure buffers (accumulators and valves) to eliminate the disadvantage that the pulsation is very large at high flow rate and high pressure output And further applies improved techniques such as hydraulic circuit configuration.

Korean Patent Publication No. 10-2002-0019149 (March 12, 2002)

However, since the external gear pump can reduce the pulsation most effectively when the gear teeth are made smaller, the technique of the optimum tooth type design or the relief groove has a limitation that the degree of pulsation reduction is small at high flow rate and high pressure output. However, failing to reduce the tooth profile of the gear is caused by requiring a higher speed rotation because the output flow rate is smaller than the same rotation speed.

In addition, the technique using a separate pressure buffer device in the hydraulic circuit complicates the configuration of the hydraulic pressure system and is economically inefficient.

Accordingly, the double-phase external displacement type external gear pump of the present invention and the hydraulic system using the same can reduce the pulsation in the pump itself without any additional device in the hydraulic circuit, and the pulsation reduction efficiency is high, The present invention is intended to increase the stability and control performance of the hydraulic system.

To achieve the above object, according to the present invention, there is provided a double-row external phase shift type external gear pump comprising: a housing for sucking operating oil into an inner space obscured by a front cover and discharging sucked operating oil to a high pressure; A main drive shaft having an axial section protruding to the outside of the housing to receive an external rotational force and having a gear tooth phase difference between the lower drive gear and the upper drive gear in the internal space; A lower subordinate shaft having a lower driven gear engaged with the lower drive gear to form a negative pressure for sucking operating oil at a lower portion of the main drive shaft; An upper driven shaft having an upper driven gear engaged with the upper driven gear to apply a back pressure to the hydraulic oil discharged from the upper portion of the main drive shaft; Is included.

Each of the main drive shaft, the upper slave shaft and the lower slave shaft is supported by a housing shaft support section supported by the housing and a shaft support section supported by the front cover.

Each of the main drive shaft, the upper slave shaft and the lower slave shaft is supported by a front journal bearing. A rubber packing is further provided between the front journal bearing and the front cover. The main drive shaft supports an axial section where the lower drive gear and the upper drive gear are spaced apart from each other by a rear journal bearing, and the rear journal bearing supports a shaft support section of the lower slave shaft. The shaft section supported by the rear journal bearing further includes a rear space and a rear bearing packing. The lid shaft support section of the lower slave shaft is supported by a neutral plane journal bearing. The housing further includes a retainer, and the retainer is passed through a shaft portion of the main drive shaft, which protrudes from the housing to the outside.

According to another aspect of the present invention, there is provided a hydraulic system including a housing having an inner space obscured by a front cover, a main drive shaft having a gear position phase difference between the lower drive gear and the upper drive gear, A lower slave shaft having a lower driven gear engaged with the lower drive gear so as to form a negative pressure for sucking operating oil from the lower portion of the main drive shaft, a back pressure is applied to the hydraulic oil discharged from the upper portion of the main drive shaft A front journal bearing supporting each of the main drive shaft, the upper drive shaft and the lower drive shaft, a neutral surface journal bearing supporting the lower drive shaft, A rear space and a rear bearing packing provided in an axial section supported by the rear journal bearing, A rear journal bearing supporting the lower slave shaft with an axial section of the main drive shaft spaced apart from the lower drive gear and the upper drive gear, a rubber packing between the front journal bearing and the front cover, An external gear pump having a retainer through which a shaft portion of the main drive shaft that has passed out passes; A working oil inflow line for allowing a negative pressure formed in the inner space of the housing to act to suck the operating fluid into the inner space; An operating oil outlet line for discharging the high-pressure operating oil in the inner space of the housing to the outside; And a motor for transmitting a rotational force to the main drive shaft which has escaped to the outside of the housing.

The present invention increases the range of the output flow rate and the pressure with respect to the input revolution speed through the double-phase phase displacement type external gear pump, and has an effect of reducing the pulsation of the output gear set using two output gears using the phase difference of the gear.

FIG. 1 is an exploded perspective view of a double-phase displacement type external gear pump according to the present invention, FIG. 2 is an assembly diagram of a double-phase displacement type external gear pump according to the present invention, FIG. 4 is a schematic view of the pulsation-reduced output characteristic of the double-phase displacement type external gear pump applied to the hydraulic system according to the present invention. FIG. 5 is a graph showing the output characteristics of the double- This is an example of a hydraulic system in which an external gear pump is used to supply and output hydraulic fluid.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

FIGS. 1, 2 and 3 show the configuration of a double-phase displacement type external gear pump according to the present embodiment.

1, the external gear pump 100 includes a housing 1, a front cover 2, a plurality of shafts 3, 4 and 5, a plurality of gears 3-1, 3-2, 4-1, 5-1, a plurality of bearings 6, 7, 10, a plurality of packings 8, 11, a rear space 9, and a retainer 12.

Specifically, the housing 1 is formed in a cylindrical shape having an internal space. In addition, the housing 1 has a central hole 1-1 pierced through the center in the axial direction and an upper groove 1-2 and a lower groove 1-2, respectively, above and below the center hole 1-1, 1-3). The housing 1 is formed with a working oil inlet 1-5 toward the lower groove 1-3 and a bypass outlet 1-7 and an operating oil outlet 1-9 ). Particularly, the bypass outlet (1-7) or the hydraulic oil outlet (1-9) further includes a check valve, and the check valve maintains the closed state for forming a negative pressure of the internal space, So that the suction of the working oil can be smoothly maintained.

Specifically, the front cover 2 is bolted to one side of the housing 1 so as to block the inner space of the housing 1 from the outside, and the center hole 1 -1), grooves that coincide with the upper grooves 1-2 and the lower grooves 1-3, respectively.

Specifically, the plurality of shafts 3, 4, 5 are composed of the main drive shaft 3, the upper slave shaft 4, and the lower slave shaft 5, And 4-1 and 5-1 are provided on the lower drive gear 3-1 and the upper drive gear 3-2 and the upper drive shaft 3-2 provided on the main drive shaft 3, An upper driven gear 4-1 and a lower driven gear 5-1 provided on the lower driven shaft 5. [ The rotation of the main drive shaft 3 rotates the upper slave shaft 4 and the lower slave shaft 5 respectively and the rotation direction of the upper slave shaft 4 and the lower slave shaft 5 And forms a direction opposite to that of the drive shaft 3. Particularly, each of the lower driving gear 3-1, the upper driving gear 3-2, the upper driven gear 4-1 and the lower driven gear 5-1 is connected to the main drive shaft 3, They may be separately manufactured to be coupled with the upper and lower subordinate shafts 4 and 5 using a key and a keyway, respectively, or may be manufactured integrally with the shaft.

Specifically, the plurality of bearings 6, 7, and 10 are composed of a front journal bearing 6, a neutral face journal bearing 7, and a rear journal bearing 10. The front journal bearing 6 is passed through the main drive shaft 3, the upper slave shaft 4 and the lower slave shaft 5, respectively, and supports the shaft portion that is penetrated. The neutral plane journal bearing 7 penetrates the lower slave shaft 5 and supports the shaft portion that is penetrated. The rear journal bearing 10 penetrates the main drive shaft 3 and supports a shaft portion that is penetrated.

Specifically, the plurality of packings (8, 11) are composed of a rear bearing packing (8) and a rubber packing (11). The rear bearing packing 8 forms a hermetic seal with respect to the main drive shaft 3 and the lower drive shaft 5 and the rubber packing 11 is connected to the main drive shaft 3 and the upper slave shaft 4, (5).

Specifically, the rear space 9 adjusts the spacing of the rear journal bearing 10 and the rear bearing packing 8.

Specifically, the retainer 12 supports an axial section of the main drive shaft 3 protruding out of the housing 1 by being coupled to the center hole 1-1 of the housing 1. As shown in FIG.

2, the main drive shaft 3 having the lower drive gear 3-1 and the upper drive gear 3-2, the upper driven gear 4-1 A front journal bearing 6, a neutral surface journal bearing 7, a rear journal bearing 10, a rear journal bearing 5 having a lower driven gear 5-1, The bearing packing 8, the rubber packing 11, the rear space 9, and the retainer 12 are accommodated. One side of the housing 1 is covered with the front cover 2 which is bolted to the outside so that the internal space is blocked from the outside and the side opposite to the housing 1 is fitted into the retainer 12 So that the center hole 1-1 from which the spline shaft portion of the main drive shaft 3 is removed is blocked from the outside.

Therefore, the external gear pump 100 is operated by inputting external rotational force to the spline shaft portion of the main drive shaft 3, which has come out of the housing 1, and is operated by the negative pressure for sucking the operating oil A back pressure for discharging is formed in the inner space of the housing 1. [

The main drive shaft 3 is supported by both the center hole 1-1 of the housing 1 and the front cover 2 using the grooves of the front cover 2, Is supported by a rear journal bearing (10) and a front journal bearing (6) for stable axial rotation. The upper slave shaft 4 is supported on both shaft portions by using the grooves of the upper groove 1-2 and the front cover 2 of the housing 1 and the shaft sections supported by the grooves of the front cover 2 And is supported by the front journal bearing 6 for stable shaft rotation. The lower slave shafts 5 are supported by both the lower grooves 1-3 of the housing 1 and the grooves of the front lid 2 and the shaft sections supported by the grooves of the front lid 2 And is supported by the rear journal bearing 10 and the neutral plane journal bearing 7 for stable axial rotation.

The main drive shaft 3 and the subordinate drive shaft 5 are connected to the lower drive gear 3-1 of the main drive shaft 3 and the lower driven gear 5-1 of the subordinate drive shaft 5, (3) and the lower subordinate axis (5) are rotated in opposite directions to each other. The main drive shaft 3 and the upper drive shaft 4 are connected to the upper drive gear 3-2 of the main drive shaft 3 and the upper driven gear 4-1 of the upper drive shaft 4, (3) and the upper slave shaft (4) are rotated in opposite directions to each other.

3, the lower driving gear 3-1 and the upper driving gear 3-2 form a gear phase difference P angle at the main driving shaft 3, The coaxial shaft 4 and the lower slave shaft 5 form a layout in which a double phase phase shift is formed.

Therefore, the external gear pump 100 sets the main drive shaft 3 as an input path through which external power is transmitted, and the rotation of the main drive shaft 3 is transmitted to the upper drive gear 3-1 and the lower driven gear 5-1, And the upper driven gear 4-2 rotates the upper driven shaft 4 via the upper driven gear 3-2 and the upper driven gear 4-1. As a result, the rotation of the lower slave shaft 5 forms a negative pressure in which the working oil flows into the working oil inlet 1-5 of the housing 1, and the rotation of the upper slave shaft 4 causes the working oil to flow into the housing 1 (Back pressure) discharged to the working oil outlet 1-9 of the compressor 1 is formed.

Referring to FIG. 4, pulsation-reduced output characteristics of the external gear pump 100 due to the double-phase phase displacement formed by the main drive shaft 3, the upper slave shaft 4 and the lower slave shaft 5 can be seen.

As shown in the figure, the first pulsating pattern A due to the lower drive gear 3-1 and the lower driven gear 5-1 and the first drive gear 3-2 And the second pulsation pattern B due to the upper driven gear 4-1 are generated. However, the gear tooth phase difference (P angle ) between the lower drive gear 3-1 and the upper drive gear 3-2 is different from the gear phase difference P angle between the first drive pulley A and the second drive pulley B, (C) so that pulsation-reduced output characteristics can be obtained. In addition, since the negative pressure and the back pressure are divided into the lower driven gear 5-1 and the upper driven gear 4-1, the output flow rate and the pressure range with respect to the input revolutions increase.

Meanwhile, FIG. 5 shows the operating state of the hydraulic system in which the hydraulic oil supply and output circuit is constructed using the double-phase phase displacement type external gear pump according to the present embodiment.

As shown, the hydraulic system 200 includes an external gear pump 100 described with reference to Figs. 1-4 and a motor 300 for rotating the external gear pump 100, and the external gear pump 100 The hydraulic oil inflow line 200-5, the hydraulic oil bypass line 200-7, and the hydraulic oil outlet line 200-9 linked to the hydraulic oil inlet line 200-5.

The working oil inflow line 200-5 forms an inflow path through which the hydraulic oil flows into the external gear pump 100 by the action of a negative pressure formed by the external gear pump 100. [ Therefore, the working oil inflow line 200-5 is connected to the working oil inlet 1-5 formed on the lower groove 1-3 of the housing 1. [ The hydraulic oil bypass line 200-7 is provided with a check valve 200-7A for maintaining a closed state by a negative pressure action formed by the external gear pump 100. [ Therefore, the working oil bypass line 200-7 is connected to the bypass outlet 1-7 formed toward the upper groove 1-2 of the housing 1, and the check valve 200-7A is in the overpressure state Open. The working oil outlet line 200-9 forms an outlet path through which hydraulic oil backed by the external gear pump 100 is discharged. Therefore, the working oil outlet line 200-9 is connected to the working oil outlet 1-9 formed toward the upper groove 1-2 of the housing 1.

The hydraulic system 200 generates high-pressure hydraulic fluid backpressed by the operation of the external gear pump 100, and the suction and discharge of the hydraulic fluid are performed in an initial state (A) to a pumping state according to the operation state of the external gear pump 100 State (B) -> high-pressure discharge state (C).

The motor 300 is driven and the rotational force of the motor 300 is transmitted to the main drive shaft 3 so that the main drive shaft 3 is rotated and the rotation of the main drive shaft 3 is transmitted to the lower drive gear 3 -1 so that the lower driven shaft 5 is rotated and is transmitted to the upper driven gear 4-1 via the upper drive gear 3-2, The driven shaft 4 is rotated. As a result, when the rotation direction of the main drive shaft 3 is clockwise, the lower driven gear 5-1 rotates counterclockwise (counterclockwise) as counterclockwise rotation 2b of the lower drive gear 3-1 2a and the upper driven gear 4-1 is rotated in the counterclockwise rotation 1b as opposed to the clockwise rotation 1a of the upper drive gear 3-2.

The negative pressure is applied to the working oil inflow line 200-5 by the negative pressure in the inner space of the housing 1 due to the rotation of the lower driven gear 5-1 in the pumping state of B and the working oil pumped in the working oil storage tank Enters the working oil inlet 1-5 through the working oil inflow line 200-5. At this time, the check valve 200-7A provided in the hydraulic oil bypass line 200-7 maintains the closed state by forming the negative pressure, so that suction of the working oil by the negative pressure is smoothly maintained. As a result, the operating oil is simultaneously introduced into the lower driven gear 5-1 and the lower drive gear 3-1.

C, the hydraulic oil flowing into the lower driving gear 3-1 while the hydraulic oil continues to flow due to the rotation of the lower driving gear 3-1 and the lower driven gear 5-1 continues to flow through the hydraulic oil outlet 1 -9, and the rotation of the upper drive gear 3-2 and the upper driven gear 4-1 applies pressure to the discharged hydraulic oil so that high-pressure hydraulic oil flows to the hydraulic oil outlet line 200-9 do.

As described above, the hydraulic system according to the present embodiment includes a pair of driving gears 3-1, 3-2 having front and rear gear phase differences (P angle ) formed in the inner space of the housing 1 covered with the front cover 2, And a pair of driven shafts (4, 5) arranged in a double row so as to be engaged with a pair of drive gears (3-1, 3-2) together with a main drive shaft (3) A motor 300 for transmitting the rotational force to the main drive shaft 3; a working oil inflow line 200-5 for sucking the working fluid into the inner space by a negative pressure formed in the inner space of the housing 1; And the hydraulic oil outlet line (200-9) for discharging the high-pressure hydraulic fluid in the internal space of the internal combustion engine (1) to the outside, so that the double-row phase shift type external gear pump (100) can reduce the pulsation itself without additional devices in the hydraulic circuit Particularly, the hydraulic system 200 has a high pulsation reduction efficiency and a reduced output flow rate But it can be increased further and stability and control performance can also be enhanced.

1: Housing 1-1: Center hole
1-2: Upper groove 1-3: Lower groove
1-5: Working fluid inlet 1-7: Bypass outlet
1-9: Working oil outlet
2: Front cover 3: Main drive shaft
3-1: Lower drive gear 3-2: Upper drive gear
4: upper slave shaft 4-1: upper driven gear
5: Lower slave axis 5-1: Lower driven gear
6: Front journal bearing 7: Neutral face journal bearing
8: Rear bearing packing 9: Rear space
10: Rear journal bearing 11: Rubber packing
12: retainer
100: External gear pump
200: hydraulic system 200-5: hydraulic oil inflow line
200-7: hydraulic oil bypass line
200-7A: Check valve 200-9: Working oil outlet line
300: motor

Claims (12)

A housing for sucking operating oil into an internal space obscured by a front cover and discharging sucked operating oil to a high pressure;
A main drive shaft having an axial section protruding to the outside of the housing to receive an external rotational force and having a gear tooth phase difference between the lower drive gear and the upper drive gear in the internal space;
A lower subordinate shaft having a lower driven gear engaged with the lower drive gear to form a negative pressure for sucking operating oil at a lower portion of the main drive shaft;
An upper driven shaft having an upper driven gear engaged with the upper driven gear to apply a back pressure to the hydraulic oil discharged from the upper portion of the main drive shaft;
Wherein the external gear pump is a double-phase external displacement type external gear pump.
The main drive shaft, the upper slave shaft, and the lower slave shaft are respectively supported by a housing shaft support section supported by the housing and a shaft support section supported by the front cover, Phase shift type external gear pump.
[3] The apparatus as claimed in claim 2, wherein the main shaft support section of the main drive shaft is supported by a center hole passing through the center of the housing to form an axial section extending out of the housing, Wherein the housing support portion of the upper slave shaft is supported by an upper groove formed in the housing at an upper portion of the center hole.
The dual-phase external displacement gear pump according to claim 2, wherein each of the main drive shaft, the upper slave shaft, and the lower slave shaft is supported by a front journal bearing.
The dual-phase external displacement gear pump according to claim 4, further comprising a rubber packing between the front journal bearing and the front cover.
[3] The apparatus of claim 2, wherein the main drive shaft supports an axial section of the lower drive gear and the upper drive gear separated from each other by a rear journal bearing, and the rear journal bearing supports a cover shaft support section of the lower subordinate shaft A dual-phase displacement type external gear pump characterized by.
7. The dual-phase external displacement gear pump of claim 6, further comprising a rear space and a rear bearing packing in an axial section supported by the rear journal bearing.
3. The dual-phase external displacement gear pump according to claim 2, wherein the lid shaft support portion of the lower slave shaft is supported by a neutral-surface journal bearing.
[2] The apparatus according to claim 1, wherein the housing is formed with a working oil inlet through which the working oil is sucked in the lower slave axis and an operating oil outlet through which the working oil is discharged from the upper slave shaft at a high pressure, Wherein the external gear pump is connected to the space.
The dual-phase displacement type external gear pump according to claim 1, wherein the housing further includes a retainer, and the retainer is passed through an axial portion of the main drive shaft which has passed through the housing.
A motorcycle according to any one of claims 1 to 10, including a housing, a front cover, a lower drive shaft and a lower drive shaft, a lower drive shaft and a lower drive shaft having a lower drive gear and a lower drive shaft, A double - phase displacement type external gear pump with a coaxial configuration;
A working oil inflow line for allowing a negative pressure formed in the inner space of the housing to act to suck the operating fluid into the inner space;
An operating oil outlet line for discharging the high-pressure operating oil in the inner space of the housing to the outside;
A motor for transmitting a rotational force to the main drive shaft which has escaped to the outside of the housing;
And the hydraulic system.
[12] The apparatus of claim 11, wherein the operating oil inlet line is connected to an operating oil inlet formed in the housing to form an operating oil suction path to the internal space of the housing, And is connected to an operating oil outlet formed in the housing to form a path.
KR1020140194448A 2014-12-30 2014-12-30 Double Rows Phase Displacement type External Gear Pump and Hydraulic System thereby KR20160083386A (en)

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KR1020140194448A KR20160083386A (en) 2014-12-30 2014-12-30 Double Rows Phase Displacement type External Gear Pump and Hydraulic System thereby

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Application Number Priority Date Filing Date Title
KR1020140194448A KR20160083386A (en) 2014-12-30 2014-12-30 Double Rows Phase Displacement type External Gear Pump and Hydraulic System thereby

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180075755A (en) * 2016-12-26 2018-07-05 한국로봇융합연구원 Small hydraulic system integrated with motor and double rows phase displacement type external pump and built-in hydraulic circuit
KR20180079574A (en) * 2016-12-30 2018-07-11 명화공업주식회사 Dual gear pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020019149A (en) 2000-09-05 2002-03-12 이계안 Gear type oil pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020019149A (en) 2000-09-05 2002-03-12 이계안 Gear type oil pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180075755A (en) * 2016-12-26 2018-07-05 한국로봇융합연구원 Small hydraulic system integrated with motor and double rows phase displacement type external pump and built-in hydraulic circuit
KR20180079574A (en) * 2016-12-30 2018-07-11 명화공업주식회사 Dual gear pump

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