KR20170001931U - internal gear pump - Google Patents

internal gear pump Download PDF

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Publication number
KR20170001931U
KR20170001931U KR2020150007669U KR20150007669U KR20170001931U KR 20170001931 U KR20170001931 U KR 20170001931U KR 2020150007669 U KR2020150007669 U KR 2020150007669U KR 20150007669 U KR20150007669 U KR 20150007669U KR 20170001931 U KR20170001931 U KR 20170001931U
Authority
KR
South Korea
Prior art keywords
ring gear
casing
circumferential surface
inner circumferential
gear
Prior art date
Application number
KR2020150007669U
Other languages
Korean (ko)
Inventor
이창목
한진희
Original Assignee
훌루테크 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 훌루테크 주식회사 filed Critical 훌루테크 주식회사
Priority to KR2020150007669U priority Critical patent/KR20170001931U/en
Publication of KR20170001931U publication Critical patent/KR20170001931U/en

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Classifications

    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The present invention is characterized in that a seating groove is formed in the inner circumferential surface of the mounting hole of the casing and a supporting pad is provided in the seating groove for preventing rotation of the inner ring gear while preventing wear of the inner circumferential surface of the mounting hole A gear pump is provided to prevent the occurrence of uneven wear due to irregularity in pressure balance during rotation while the ring gear is being loaded from low speed to high speed during pumping operation of the hydraulic oil.

Description

An internal gear pump

The present invention relates to a gear pump, and more particularly, to a new type of gear pump that prevents the occurrence of uneven wear due to irregularity in pressure balance during rotation while the ring gear is being loaded from low speed to high speed during pumping operation To an internal gear pump.

Generally, a gear pump is a pump for transferring a compressed oil (for example, oil, etc.) trapped in a space between a tooth and a tooth of a gear by meshing the two gears with each other. And is widely used because of its advantage that the discharge pressure is not influenced by the number of revolutions.

The internal gear pump rotates the pinion gear, which is in contact with the ring gear, so that the two gears are rotated at the same time, and between the ring gear and the pinion gear, A negative pressure (negative pressure) is formed in the gap, and this negative pressure is used to pump the pressure oil in the fluid tank and supply it to the pressure side connected to the hydraulic system.

Such internal gear pumps are disclosed in Japanese Patent Laid-Open Nos. 10-2014-0050561, 10-2015-0062164, 10-2013-0141564, and US 4,472,123.

However, the internal gear pump according to the related art has a problem in that uneven wear occurs due to irregularity of pressure balance during rotation while the ring gear is being loaded from low speed to high speed during pumping operation of pressure oil.

That is, since the ring gear of the internal gear pump is forced to be driven to the aluminum casing at a high speed, an axial force eccentric to the outlet of the pressure oil is generated due to the discharge pressure. As a result of such an eccentric axial force, Severe abrasion occurred on the wall surface at the outlet side of the pressure oil in the inner surface of the casing.

In addition, as described above, the uneven wear on the inner surface of the aluminum casing affects the rotation of the ring gear, making the pressure balance more uneven, thereby deteriorating the overall pumping performance over time.

Published Japanese Patent Application No. 10-2014-0050561 Published Japanese Patent Application No. 10-2015-0062164 Patent Publication No. 10-2013-0141564 U.S. Patent No. 4,472,123

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a ring gear, To an internal gear pump according to a new form for preventing occurrence of uneven wear.

In order to achieve the above object, according to the present invention, there is provided an internal gear pump comprising: a casing having an installation hole formed at an inner side thereof and formed with an inlet port through which pressurized oil flows and an outlet through which compressed oil flows; And an external gear type pinion gear which is eccentrically disposed in the internal gear ring gear and rotates in engagement with the internal gear ring gear, the internal gear pump comprising: The bearing groove is formed on the inner circumferential surface, and the bearing groove is further provided with a support pad for supporting the rotation of the ring gear, while preventing abrasion of the inner circumferential surface of the mounting hole.

Here, the support pad is rounded to have an inner circumferential surface having the same circumference as a circumference formed by the inner circumferential surface of the installation hole, and the casing is made of aluminum (Al), and the support pad has superior abrasion resistance (CU) material.

Each of the seating grooves is formed to be symmetrical to each other on both sides of the outlet port with respect to a position where the outlet port is formed in the inner circumferential surface of the mounting hole, and the plurality of supporting pads are provided, Respectively.

As described above, in the internal gear pump of the present invention, a plurality of support pads are additionally provided on the inner circumferential surface of the mounting hole of the casing to prevent wear of the inner circumferential surface of the casing due to the eccentrically axial force of the ring gear, The gear can always be maintained in a stable rotation state, and thus the phenomenon of degradation of the pumping performance can be minimized.

Furthermore, the internal gear pump of the present invention has the effect of allowing maintenance support of the casing to be further extended due to each support pad, as well as maintenance cost can be reduced.

1 is an exploded cross-sectional view illustrating an internal gear pump according to an embodiment of the present invention;
2 is a cross-sectional view illustrating an internal gear pump according to an embodiment of the present invention;
3 is a side view for explaining the internal structure of the internal gear pump according to the embodiment of the present invention
Fig. 4 is a state diagram showing the state of the axial force applied to the internal gear pump according to the prior art; Fig.
5 is a state diagram for explaining the state of the axial force applied to the internal gear pump according to the embodiment of the present invention

Hereinafter, a preferred embodiment of the internal gear pump of the present invention will be described with reference to FIGS. 1 to 5 attached hereto.

1 is an exploded cross-sectional view illustrating an internal gear pump according to an embodiment of the present invention, FIG. 2 is an assembled cross-sectional view illustrating an internal gear pump according to an embodiment of the present invention, FIG. Fig. 3 is a side view illustrating an internal structure of an internal gear pump according to an embodiment of the present invention.

As shown in these drawings, the internal gear pump according to the embodiment of the present invention mainly includes the casing 100, the internal gear ring gear 200, the external gear pinion gear 300, and the drive shaft 400 In particular, a plurality of support pads 500 are additionally provided on the friction surface between the inner circumferential surface of the casing 100 and the innerside ring gear 200 to prevent the occurrence of uneven wear on the inner circumferential surface of the casing 100 It is suggested that

This will be described in more detail below for each configuration.

First, the casing 100 is a portion constituting the body of the internal gear pump.

The casing 100 is made of aluminum and has an installation hole 110 through which the installation hole 110 penetrates. The inlet port 120 through which the pressurized oil flows and the outlet 130 through which the pressurized oil flows out are formed on the circumferential surface. Respectively. The inlet 120 and the outlet 130 are formed so as to communicate with the inside of the installation hole 110 and are positioned side by side with the installation hole 110 interposed therebetween.

The front and rear surfaces of the casing 100 further include a front case 140 and a rear case 150 that are detachably coupled to each other while closing the inside of the installation hole 110, As shown.

Next, the internal gear ring gear 200 is a portion forming the compression chamber together with the external tooth type pinion gear 300 to be described later.

The internal gear ring gear 200 is a ring gear that is rotatably installed in an installation hole 110 of the casing 100 and has a gear tooth 201 formed along the inner circumferential surface thereof.

A plurality of communication holes 210 are formed in the circumferential surface of the internal gear ring gear 200 along its circumferential direction. At this time, each of the communication holes 210 is supplied with pressurized oil through an inlet 120 formed on one side of the casing 100, and is introduced into the inside gear ring gear 200, And discharges compressed oil in the gear 200 through the outlet 130 formed on the other side of the casing 100.

Next, the external tooth type pinion gear 300 is a portion for compressing the pressure oil in the compression chamber formed between the internal gear ring gear 200 and the internal gear ring gear 200 while rotating the internal gear ring gear 200.

The outer tooth type pinion gear 300 is formed to have an outer diameter smaller than the inner diameter of the dentate ring gear 200 and a gear tooth 301 is formed along the outer peripheral surface thereof. And is rotatably engaged with the internal gear ring gear 200 in an eccentrically arranged manner.

Next, the drive shaft 400 rotates the external tooth type pinion gear 300.

The drive shaft 400 is fixed to the rotation center of the pinion gear 300 and has both ends passing through the front case 140 and the rear case 150. At this time, Is connected to receive power from a driving unit (for example, a motor, an engine, or the like) that provides a driving force.

The drive shaft 400 may be formed as a single body with the external tooth type pinion gear 300 described above, or may be configured to be separated from each other and fixed to each other.

A not-shown reference numeral 500 denotes a segment which is a space between the gear teeth 201 of the internal gear ring gear 200 in a state of being positioned between the internal gear ring gear 200 and the external gear pinion gear 300 And the teeth between the gear teeth 301 of the external tooth type pinion gear 300 are closed so that the pressure oil can be transferred along the closed space to separate the high pressure side and the low pressure side from each other.

The supporting pad 600 is mounted on the inner circumferential surface of the mounting hole 110 of the casing 100 and is fixed to the inner circumferential surface of the mounting hole 110 by the inner ring gear 200 installed in the mounting hole 110. [ And also supports the rotation of the dentate ring gear 200.

The support pads 600 are formed to be rounded so as to have an inner circumferential surface having the same circumference as the circumference formed by the inner circumferential surface of the installation hole 110, and are installed on the inner circumferential surface of the installation hole 110. At this time, a seating groove 160 for recessing the supporting pad 600 is formed on the inner circumferential surface of the mounting hole 110, and the supporting pad 600 is inserted into the seating groove 160 So that the inner circumferential surface thereof can form a part of the inner circumferential surface of the installation hole (110).

Particularly, the support pad 600 is installed on the inner circumferential surface of the installation hole 110 of the casing 100 with respect to the position of the inlet port 120 and the outlet port 130, So that they can be installed symmetrically on both sides. 4, an axial eccentric force as shown in FIG. 4 is generated by the pressure at which the pressure oil is discharged at the portion where the outlet 130 is formed during the rotation of the internal gear ring gear 200. As a result, The support pads 600 are provided on the side in which the eccentric axial force is generated as shown in FIG. 5, thereby reducing axial force generation. As a result, The ring gear 200 can be smoothly rotated and vibration and noise can be reduced.

In the case of two supporting pads 600 symmetrically installed on both sides of the inlet port 120, two supporting pads 600 installed on both sides of the outlet port 130 and a center of the installation hole 110 are defined as reference So that the rotational operation of the ring gear 200 can be evenly balanced over the entire area. If the balance is not taken into account, The support pad 600 may be provided only on the support pads 600.

Further, the support pad 600 may be made of a copper (CU) material having a higher abrasion resistance than the casing 100.

That is, in the case of the support pad 600, since the support pad 600 is disposed on the direction side in which the load is more supplied from the internal gear ring gear 200 as described above, the support pad 600 is more wear- It is possible to minimize wear due to the collision with the damping ring gear 200 due to the eccentric axial force and to prevent the bearing pads 600 from being damaged due to excessive wear on the inner surface of the mounting hole 110 of the casing 100 So that the abrasion can be prevented.

Further, in the embodiment of the present invention, it is further suggested that the support pad 600 is replaceably installed.

That is, even though the support pad 600 is formed of the same material, considering the continuous wear due to the eccentric axial force of the internal gear ring gear 200, (Wear) on the inner circumferential surface can be prevented so that the maintenance cost can be reduced as compared with the replacement of the casing 100. [

At this time, the replaceable structure of the support pad 600 is a structure in which the seating groove 160, in which the support pad 600 is installed, is inserted into the front surface of the casing (either side of the direction in which the installation hole passes, The left end face in the drawing). That is, the support pad 600 can be inserted into the seating groove 160 from the front surface of the casing 100, thereby enabling replacement as needed.

At this time, the axial depth of the seating groove 160 (the length on the left and right side in the drawing with reference to FIGS. 1 and 2) is set such that the supporting pad, which is seated in the seating groove, Make sure that all of them are covered enough to cover.

In the following, the operation state of the internal gear pump according to the embodiment of the present invention configured as described above will be described in more detail.

First, when the driving unit is driven, the driving force according to the driving is transmitted to the driving shaft 400 to rotate the driving shaft 400.

When the driving shaft 400 is rotated, the pinion gear 300 fixed to the driving shaft 400 is rotated. Then, the pinion gear 300 is engaged with the pinion gear 300, (200) is rotated.

The space between the external tooth type pinion gear 300 and the internal gear ring gear 200 is formed in the space between the low pressure side and the high pressure side where the inlet port 120 of the casing 100 is formed, The teeth of the gear teeth 201 and 301 that are closed by the segment 500 between the pinion gear 300 and the internal gear ring 200 enter the gear teeth 201 and 301, And then flows out through the outlet port 130. [0031] As shown in FIG.

Particularly, when the internal gear ring gear 200 is rotated along the installation hole 110 of the casing 100 in the process of pumping oil by driving the internal gear pump as described above, 200 and the external gear type pinion gear 300, the dented ring gear is subjected to a greater load toward the side where the outlet 130 is formed due to a pressure difference between the low-pressure side and the high-pressure side in the compression chamber.

However, since the support pads 600 positioned on the inner circumferential surface of the installation hole 110 of the casing 100 support the rotation of the ring gear 200, the overall pressure balance is maintained uniformly, It is possible to smoothly rotate the toothed ring gear 200 and to prevent an uneven wear on the inner circumferential surface of the mounting hole 110 of the casing 100.

In addition, the support pads 600 are continuously worn due to the load transmitted from the ring gear 200. However, since the support pads 600 are formed of the same material, The casing 100 is brought into direct contact with the casing 100, so that the casing 100 is made to be extremely small compared to the casing 100, so that the maintenance period of the internal gear pump can be further increased.

If the support pads 600 are excessively worn, the maintenance cost can be reduced by replacing only the worn support pads 600 without replacing the casing 100.

The internal gear pump of the present invention has a structure in which the plurality of support pads 600 are additionally provided on the inner circumferential surface of the mounting hole 110 of the casing 100 so that the casing 100 is rotated by the eccentric axial force of the inner ring gear 200, The wear of the inner circumferential surface is prevented and the ring gear 200 is maintained in a stable rotational state at all times, thereby minimizing the phenomenon of deterioration of the pumping performance.

In addition, the maintenance pad can be further extended due to the support pad 600, and the maintenance cost can be reduced.

100. Casing 110. Installation Ball
120. Inlet 130. Outlet
140. Front case 150. Rear case
160. Retaining groove 200. Inner toothed ring gear
201. Gear teeth 210. Connection balls
300. External Pinion Gear 301. Gear teeth
400. Drive shaft 500. Segment
600. Support Pads

Claims (3)

A casing 100 having an installation hole 110 formed therein and an inlet 120 through which pressurized oil flows and an outlet 130 through which pressurized oil flows are formed in the periphery of the casing 100; An annular ring gear 200 rotatably mounted on an inner circumferential surface of the inner ring gear 110 and an outer ring gear 300 arranged eccentrically in the inner ring gear 200 and rotated in engagement with the inner ring gear 200 , The internal gear pump comprising:
A seating groove 160 is formed on the inner circumferential surface of the mounting hole 110 of the casing 100,
Wherein the seating groove (160) is further provided with a support pad (600) for supporting the rotation of the internal gear ring gear (200) while preventing wear of the inner circumferential surface of the installation hole (110). The method according to claim 1,
The supporting pads 600 are rounded to have an inner circumferential surface having the same circumference as the circumference of the inner circumferential surface of the mounting hole 110,
Wherein the casing (100) is made of aluminum (Al), and the support pad (600) is made of a copper (CU) material having a higher abrasion resistance than the casing (100). The method according to claim 1 or 2,
Each of the seating grooves 160 is formed to be symmetrical to each other on both sides of the outlet 130 with respect to a position where the outlet 130 is formed in the inner circumferential surface of the mounting hole 110,
Wherein the support pads (600) are provided in a plurality of positions and are respectively replaceably installed in the respective seating grooves (160).
KR2020150007669U 2015-11-24 2015-11-24 internal gear pump KR20170001931U (en)

Priority Applications (1)

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KR2020150007669U KR20170001931U (en) 2015-11-24 2015-11-24 internal gear pump

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KR2020150007669U KR20170001931U (en) 2015-11-24 2015-11-24 internal gear pump

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017318A (en) * 2021-11-18 2022-02-08 宁波威克斯液压有限公司 Rolling type self-adjusting balancer and high-pressure internal gear pump comprising same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472123A (en) 1979-10-19 1984-09-18 Messrs. Otto Eckerle Gmbh & Co. Kg Internal gear machine with segmented filler members
KR20130141564A (en) 2010-11-30 2013-12-26 로베르트 보쉬 게엠베하 Internal gear pump
KR20140050561A (en) 2012-10-19 2014-04-29 로베르트 보쉬 게엠베하 Internal gear pump for a hydraulic vehicle brake system
KR20150062164A (en) 2012-09-25 2015-06-05 로베르트 보쉬 게엠베하 Internal gear pump for a hydraulic vehicle brake system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472123A (en) 1979-10-19 1984-09-18 Messrs. Otto Eckerle Gmbh & Co. Kg Internal gear machine with segmented filler members
KR20130141564A (en) 2010-11-30 2013-12-26 로베르트 보쉬 게엠베하 Internal gear pump
KR20150062164A (en) 2012-09-25 2015-06-05 로베르트 보쉬 게엠베하 Internal gear pump for a hydraulic vehicle brake system
KR20140050561A (en) 2012-10-19 2014-04-29 로베르트 보쉬 게엠베하 Internal gear pump for a hydraulic vehicle brake system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017318A (en) * 2021-11-18 2022-02-08 宁波威克斯液压有限公司 Rolling type self-adjusting balancer and high-pressure internal gear pump comprising same

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