WO2008029477A1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
WO2008029477A1
WO2008029477A1 PCT/JP2006/317872 JP2006317872W WO2008029477A1 WO 2008029477 A1 WO2008029477 A1 WO 2008029477A1 JP 2006317872 W JP2006317872 W JP 2006317872W WO 2008029477 A1 WO2008029477 A1 WO 2008029477A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
pressure side
hole
eyeglass
gear pump
Prior art date
Application number
PCT/JP2006/317872
Other languages
French (fr)
Japanese (ja)
Inventor
Tsugunori Ishinaka
Koji Komatsu
Takumi Ishihara
Original Assignee
Shimadzu Corporation
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 Shimadzu Corporation filed Critical Shimadzu Corporation
Priority to KR1020097004368A priority Critical patent/KR101146501B1/en
Priority to CN2006800557822A priority patent/CN101512158B/en
Priority to PCT/JP2006/317872 priority patent/WO2008029477A1/en
Priority to JP2008533020A priority patent/JP4952719B2/en
Priority to TW096131675A priority patent/TWI378181B/en
Publication of WO2008029477A1 publication Critical patent/WO2008029477A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086Carter
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-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
    • F04C2/14Rotary-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-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
    • F04C2/14Rotary-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
    • F04C2/18Rotary-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

Definitions

  • the present invention relates to a gear pump that is particularly applicable to construction machines, vehicle hydraulic machines, and the like.
  • a gear pump XI comprising a cover X3, X5 covering the front and rear sides of the body X4 and a casing X2 formed by connecting the covers X3 and X5 with fixing bolts X8, a construction machine, a hydraulic machine for vehicles Have been widely used as a hydraulic supply source.
  • This gear pump XI has a function of supplying hydraulic fluid to the space between the drive gear X61 and the driven gear X62 from the low-pressure side passage port X43 communicating with the above-mentioned glasses hole X4a and discharging it from the high-pressure side passage X41.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-336583
  • the present invention is configured to solve the above problems.
  • the gear pump according to the present invention includes one or a plurality of gear pairs formed by combining a driving gear and a driven gear, and a casing that houses the gear pairs, and the casing force
  • the gear pair A bearing hole formed by passing through a shaft for pivotally supporting the gear constituting the gear pair, a low pressure side port communicating with the glasses hole and sucking low pressure hydraulic fluid, A body having a high-pressure side port that communicates with the eyeglass hole and discharges high-pressure hydraulic fluid, a valve mounting portion provided in the vicinity of the high-pressure side port to which a valve can be attached, and at least one of the front and rear of the body A cover that is provided on one side and closes the eyeglass hole, wherein the body communicates with the bearing hole a return passage that communicates from the valve mounting portion to the low pressure side port. And further comprising a front-rear direction position.
  • the portion of the body provided with the bearing hole is thicker than the portion provided with the eyeglass hole, so that the strength of the body is not greatly impaired even if a return passage is provided. . That is, it is possible to reduce the number of parts and the installation space when arranging such a gear pump or motor by providing a return passage without significantly reducing the strength of the body. Furthermore, the body itself does not need to be made thicker than the conventional one as compared with the aspect in which the part around the eyeglass hole of the body is made thicker and the return passage is provided in the part. Material costs for manufacturing can be reduced.
  • the “front-rear direction position corresponding to the bearing hole” is a concept including all the front-rear direction positions where the bearing hole exists and the eyeglass hole does not exist.
  • the strength of the body is provided by providing a return passage at such a position.
  • a return passage is provided without greatly impairing the number of parts, and the number of parts and the installation space when such a gear pump or motor is disposed can be reduced.
  • the body itself does not need to be made thicker than the conventional one, as compared to a mode in which the part around the eyeglass hole of the body is thickened and a return passage is provided in the part. The material cost when manufacturing the body can be saved.
  • FIG. 1 is a side sectional view showing a gear pump according to a first embodiment of the present invention.
  • FIG. 2 is a left side view showing the gear pump in the same embodiment.
  • FIG. 3 is a right side view showing the gear pump in the same embodiment.
  • FIG. 4 is a sectional view taken along line XX in FIG.
  • FIG. 5 is a side sectional view showing a gear pump according to a second embodiment of the present invention.
  • FIG. 6 Y—Y sectional view in FIG.
  • FIG. 7 is a side sectional view showing a conventional gear pump.
  • FIG. 8 is a ZZ cross-sectional view in FIG.
  • the gear pump 1 provided by the present invention is a dual gear pump having first and second gear pairs 6 and 7.
  • This gear pump 1 has a first gear pair 6 as shown in FIG. 1 for a longitudinal sectional view, FIG. 2 for a left side view, FIG. 3 for a right side view, and FIG. 4 for a XX sectional view in FIG.
  • the first driving gear 61 and the first driven gear 62 are combined together.
  • the second gear pair 7 is configured by combining a second drive gear 71 and a second driven gear 72 together.
  • the first and second gear pairs 6 and 7 are accommodated in a casing 2 that also has front cover 3, body 4 and rear cover 5 force.
  • first and second eyeglass holes 4 a and 4 b are provided at both front and rear ends of the body 4, and the pair of gears 6 and 7 are divided into an intermediate portion of the body 4.
  • An intermediate partition wall 4W is formed.
  • a first gear pair 6 is housed in the chamber formed by the first eyeglass hole 4a and the front cover 3, and the room formed by the second eyeglass hole 4b and the rear cover 5 is 2 gear pairs 7 are housed.
  • the intermediate partition wall 4W communicates with the first and second eyeglass holes 4a and 4b, respectively, and pivots an input / output shaft 611 and a second drive gear 71 that pivotally support the first drive gear 61.
  • a bearing hole 4x through which the supporting shaft 711 is inserted is provided.
  • the intermediate partition wall 4W communicates with the first and second eyeglass holes 4a and 4b, respectively, and pivotally supports a shaft 621 and a second driven gear 72 that pivot the first driven gear 62. There are also provided bearing holes 4y through which the shafts 721 to be inserted are inserted.
  • the front cover 3 and the rear cover 5 have the same configuration as that known for use in this type of dual gear pump. That is, the front cover 3 is provided with a bearing hole 3x through which the input / output shaft 611 is inserted and a bearing hole 3y through which the shaft 621 pivotally supporting the first driven gear 62 is inserted.
  • the rear cover 5 has a bearing hole 5x through which a shaft 711 for pivotally supporting the second drive gear 71 and a shaft 721 for pivotally supporting the second driven gear 72 are inserted. 5y is provided.
  • the front cover 3, the body 4, and the rear cover 5 are integrally fixed by fixing bolts 8.
  • the Freon An oil seal 91 is provided between the cover 3 and the input / output shaft 611.
  • the first drive gear 61 is formed integrally with the input / output shaft 611.
  • the input / output shaft 611 is supported to the casing 2 by a bush 92 disposed in the bearing hole 3x of the front cover 3 and in the bearing hole 4x of the body 4.
  • the first driven gear 62 is also formed integrally with the shaft 621.
  • the shaft 621 is supported to the casing 2 by a bush 92 disposed in the bearing hole 3y of the front cover 3 and in the bearing hole 4y of the body 3.
  • the second drive gear 71 is formed integrally with the shaft 711.
  • the shaft 711 is supported to the casing 2 by a bush 92 arranged in the bearing hole 4x of the body 4 and in the bearing hole 5x of the rear cover 5 on the same axis as the first drive gear 61. ing.
  • the shaft 711 supporting the second drive gear 71 is fixed to the shaft end of the input / output shaft 611, and therefore the second drive gear 71 is synchronized with the first drive gear 61.
  • the second driven gear 72 is also formed integrally with the shaft 721.
  • the shaft 721 is supported on the casing 2 by a bush 92 disposed in the bearing hole 4y of the body 4 and in the bearing hole 5y of the rear cover 5 on the same axis as the first driven gear 62. ing.
  • the shaft 721 that supports the second driven gear 72 is completely separate from the shaft 621 that supports the first driven gear 62, and the first driven gear 62 and the second driven gear 72 are These are driven separately by the first drive gear 61 and the second drive gear 71, respectively.
  • the body 4 has first and second high-pressure side flow paths 41 and 42 on one side and a low-pressure side flow path 43 on the other side.
  • the low pressure side flow path B 43 becomes an inflow port
  • the first and second high pressure side flow paths B 41 and 42 become discharge ports.
  • the first and second high pressure side passages 41 and 42 are respectively provided in the first eye hole 4a for accommodating the first gear pair 6 and the second eye hole 4b for accommodating the second gear pair 7. Communicate.
  • the low pressure side flow path B 43 is connected to the first and second eyeglass holes 4a, 4b and extends in the front-rear direction, and is drilled from the middle of the connection part 431 toward the other side surface.
  • the opening 432 is made of.
  • a return passage 45 is provided in such a way that the front and rear positions of the bearing holes 4x and 4y are made to communicate with the valve mounting portion 44 and the low pressure side flow passage 43. That is, a return passage 45 is provided in the intermediate partition wall 4W. More specifically, a hole having a shape reaching the nozzle mounting portion 44 is drilled from the opening 432 while keeping the distance from the shaft center of the bearing hole 4x substantially constant, and this hole is returned to the return passage 45. It is said.
  • the working fluid is supplied from the low pressure side flow path B 43 to the tooth grooves of the first drive gear 61 and the first driven gear 62, and
  • the hydraulic fluid supplied to the tooth grooves of the second drive gear 71 and the second driven gear 72 respectively and supplied to the tooth grooves of the first drive gear 61 and the first driven gear 62 is supplied to the first high-pressure side flow path.
  • B and the hydraulic fluid supplied to the tooth spaces of the second drive gear 71 and the second driven gear 72 are discharged from the second high-pressure side flow passage b.
  • the input / output shaft 611 and the shaft 711 supported by the bearing hole 4x are subjected to an action of urging to the lower right in FIG.
  • the intermediate wall 4W that is thicker than the portion of the body 4 where the eyeglass holes 4a are provided is connected to the low pressure side port from the valve mounting portion 44. Since the return passage 45 communicating up to 43 is provided in the bearing hole so that the position in the front-rear direction coincides, the strength of the body 4 is not greatly impaired even if the return passage 45 is provided.
  • the input / output shaft 611 and the shaft 711 are supported by the hydraulic pressure by supporting the return passage above the bearing hole 4x in FIG. 4, that is, with respect to the bearing hole 4x. From this point, the loss of strength of the body 4 due to the provision of the return passage 45 is small.
  • the return passage 45 can be provided without greatly degrading the strength of the body 4, and the number of parts and the mounting space can be reduced when the gear pump 1 and the valve are disposed. Furthermore, the body 4 itself does not need to be made thicker than the conventional one as compared to the case where the part around the eyeglass hole 4a of the body 4 is made thicker and the relief passage is provided in the part. Material costs for manufacturing the body 4 can also be reduced.
  • the gear pump Al that works in this embodiment has a gear pair A6 and a gear pair A6 as shown in FIG. 5 in a longitudinal sectional view and in FIG. 6 in a YY sectional view in FIG.
  • a casing A2 comprising a front cover A3 and a body A4 is provided.
  • the gear pair A6 is constructed by combining a first drive gear A61 and a first driven gear A62.
  • a spectacle hole A4a is provided in the front end portion of the body A4, and the gear pair A6 is housed in a space formed by the spectacle hole A4a and the front cover A3.
  • the body A4 is connected to the eyeglass hole A4a, and the bearing holes A4x, A4y are formed by inserting the input / output shaft A611 that pivotally supports the drive gear A61 and the shaft A621 that pivotally supports the driven gear A62, respectively. Is provided.
  • the front cover A3 has the same configuration as that well known as that used in this type of gear pump. That is, the front cover 3 is provided with a bearing hole A3x through which the input / output shaft A611 is inserted and a bearing hole A3y through which the shaft A621 pivotally supporting the driven gear A62 is inserted.
  • the front cover A3 and the body A4 are integrally fixed with fixing bolts A8.
  • An oil seal A91 is provided between the front cover A3 and the input / output shaft A611.
  • the eyeglass hole A 4a is indicated by an imaginary line.
  • the drive gear A61 is formed integrally with the input / output shaft A611.
  • the input / output shaft A611 is supported with respect to the casing A2 by a bush A92 disposed in the bearing hole A3x of the front cover A3 and in the bearing hole A4x of the body.
  • the driven gear A 62 is also formed integrally with the shaft A621.
  • the shaft A621 is supported by the bush A92 disposed in the bearing hole A3y of the front cover A3 and the bearing hole A4y of the body A4 with respect to the casing A2.
  • the body A4 is provided with a high-pressure side channel port A41 on one side surface and a low-pressure side channel port A43 on the other side surface.
  • the low pressure side flow path A43 serves as the inlet
  • the high pressure side flow path A41 serves as the discharge port.
  • the high-pressure side flow path A41 is in communication with a glass hole A4a that houses the gear mechanism A6.
  • the low-pressure side flow path A43 is formed from a connection portion A431 that communicates with the above-described glass hole A4a and extends rearward, and an opening portion A432 that is drilled from the rear end portion of the connection portion A431 toward the other side surface. Become.
  • the high-pressure side flow path B41 is indicated by an imaginary line.
  • a valve mounting portion A44 to which a valve (not shown) represented by a relief valve can be attached is provided on one side surface of the body A4 where the high-pressure side flow path A41 is provided. ing.
  • a return passage A45 is provided so that the front and rear positions of the bearing hole A4x for communicating the valve mounting portion A44 and the low pressure side flow path B43 are aligned. More specifically, a hole having a shape reaching the valve mounting part A44 is formed from the opening A432 while keeping the distance of the axial center force of the first bearing hole A4x substantially constant, and the hole is returned to this hole. Passage A4 5! /
  • the position from the valve mounting portion A44 to the low-pressure side port A43 is communicated with the bearing hole A4x of the body A4 by matching the position in the front-rear direction.
  • the force providing the return passage A45 This part is thicker than the part provided with the glasses hole 4a. Therefore, the presence of the return passage A45 does not greatly impair the strength of the body A4.
  • the passage A45 is supported above the bearing hole A4x in FIG. 6, that is, the bearing hole A4x with respect to the bearing hole A4x, so that the input / output shaft A611 is substantially affected by the hydraulic pressure.
  • the present invention is not limited to the first and second embodiments described above.
  • the present invention may be applied to a gear pump having three or more pairs of gears.
  • the gear pump having two pairs of gears has two pairs of high pressure side flow passages and one low pressure side flow passage port instead of the gear pumps as in the first embodiment described above.
  • it may be configured as a phase difference gear pump in which the timing of meshing the gear pairs is shifted.
  • the casing is configured by the body and the rear cover, and the bearing hole of the body of the casing is provided. You may make it provide a relief channel
  • valve attached to the valve mounting portion is not limited to the relief valve, but may be other types of valves such as a flow control valve! /.
  • the body is relatively thick at the front-rear position corresponding to the bearing hole of the body as compared with the front-rear position corresponding to the eyeglass hole.
  • the return passage can be provided without greatly reducing the strength of the body, and the number of parts and the installation space can be reduced when installing such a gear pump.
  • the body itself does not need to be made thicker than the conventional one, as compared to a mode in which the part around the eyeglass hole of the body is made thicker and a return passage is provided in the part. Material costs for manufacturing can be reduced.

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

Abstract

A gear pump (1) that requires a reduced number of materials and a smaller installation space and that is produced at reduced material costs. The gear pump (1) has one or more gear pairs (6, 7) in which drive gears (61, 71) and driven gears (62, 72) are meshed with each other, and also has a casing (2) for receiving the gear pairs (6, 7). The casing (2) is constructed from a body (4), a front cover (3), and a rear cover (5). The body (4) has eyeglass-shaped holes (4a, 4b) for receiving the gear pairs, bearing holes (4x, 4y) communicating with the eyeglass-shaped holes (4a, 4b) and in which shafts (611, 621, 711, 721) for supporting gears (61, 62, 71, 72) forming the gear pairs are inserted, a low-pressure side port (43) communicating with the eyeglass hole (4a) and sucking a low-pressure operation liquid, high-pressure side ports (41, 42) communicating with the eyeglass-shaped hole (4a) and discharging a high-pressure operation liquid, a valve installation section (44) provided near the high-pressure side ports (41, 42) and on which a valve can be installed, and a return path (45) running from the valve installation section (44) up to the low-pressure side port (43) and positioned in the front-rear direction corresponding to the bearing holes (4x, 4y). The front cover (3) and rear cover (5) are arranged at the front and rear sides of the body (4) to close the eyeglass-shaped hole (4a).

Description

明 細 書  Specification
歯車ポンプ  Gear pump
技術分野  Technical field
[0001] 本発明は、特に建設機械、車両用油圧機械等に適用可能な、歯車ポンプに関する ものである。  [0001] The present invention relates to a gear pump that is particularly applicable to construction machines, vehicle hydraulic machines, and the like.
背景技術  Background art
[0002] 従来、図 7及び図 8に示すように、駆動歯車 X61と従動歯車 X62とを嚙合わせてな る歯車対 X6と、この歯車対 X6を収納するめがね穴 X4aを備えたボディ X4、及びこの ボディ X4の前方な 、し後方を被覆するカバー X3, X5を有しこれらを固定用ボルト X 8により接続してなるケーシング X2とを具備する歯車ポンプ XIが、建設機械、車両用 油圧機械等の油圧供給源として広く用いられてきている。この歯車ポンプ XIは、前 記めがね穴 X4aに連通する低圧側流路口 X43から作動液を駆動歯車 X61と従動歯 車 X62との間の空間に供給し、高圧側流路ロ X41から吐出させる機能を有する。  Conventionally, as shown in FIG. 7 and FIG. 8, a body X4 having a gear pair X6 formed by combining a drive gear X61 and a driven gear X62, and a glass hole X4a for housing the gear pair X6, And a gear pump XI comprising a cover X3, X5 covering the front and rear sides of the body X4 and a casing X2 formed by connecting the covers X3 and X5 with fixing bolts X8, a construction machine, a hydraulic machine for vehicles Have been widely used as a hydraulic supply source. This gear pump XI has a function of supplying hydraulic fluid to the space between the drive gear X61 and the driven gear X62 from the low-pressure side passage port X43 communicating with the above-mentioned glasses hole X4a and discharging it from the high-pressure side passage X41. Have
[0003] 近年、このような歯車ポンプ XIの高圧側に、リリーフ弁や流量制御弁等のバルブを 取り付ける要望が存在する。その際、高圧側に取り付けたバルブ力 低圧側への配 管が必要な場合があり、このような配管はこの歯車ポンプ XIの外部に設けることが多 い。  In recent years, there has been a demand for attaching a valve such as a relief valve or a flow control valve on the high pressure side of such a gear pump XI. At that time, the valve force attached to the high pressure side may require piping to the low pressure side, and such piping is often provided outside this gear pump XI.
特許文献 1:特開 2003 - 336583号公報  Patent Document 1: Japanese Patent Laid-Open No. 2003-336583
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0004] しかし、高圧側にバルブを取り付けた際、歯車ポンプ XIの外部に上述した配管を 設けると、継手や配管パイプ等が必要となり、さらにこの歯車ポンプ XI近傍に継手や 配管パイプ等を設けるためのスペースを確保する必要がある。そこで、この課題を解 決すべぐ歯車ポンプ XI内に、ノ レブ力も低圧側ポートまでを連通する連通路を設 けることが考免られる。 [0004] However, when the above-mentioned piping is provided outside the gear pump XI when the valve is attached to the high-pressure side, a joint, piping pipe, or the like is required, and a joint, piping pipe, or the like is provided near the gear pump XI. It is necessary to secure space for. Therefore, it is considered that a communication path that connects the noble force to the low-pressure side port in the gear pump XI that should solve this problem can be considered.
[0005] ところが、ボディ X4のめがね穴 X4aと前記ボルト X8との間の部分、すなわちめがね 穴 X4aに対応する前後方向位置にこのような連通路を設けると、ボディ X4のめがね 穴 X4a近傍の部位が極度に薄肉となり、めがね穴 X4aが受ける油圧に対する強度が 十分得られなくなる別の不具合が発生する。 [0005] However, if such a communication path is provided at the position between the eyeglass hole X4a of the body X4 and the bolt X8, that is, the position in the front-rear direction corresponding to the eyeglass hole X4a, the eyeglass of the body X4 Another problem occurs that the area near the hole X4a becomes extremely thin and the strength against the hydraulic pressure received by the eyeglass hole X4a cannot be obtained sufficiently.
[0006] 本発明は、上記課題を解決すべく構成するものである。 The present invention is configured to solve the above problems.
課題を解決するための手段  Means for solving the problem
[0007] すなわち、本発明に係る歯車ポンプは、駆動歯車と従動歯車とを嚙合させてなる 1 又は複数の歯車対と、この歯車対を収納するケーシングとを具備し、前記ケーシング 力 前記歯車対を収納するめがね穴、このめがね穴に連通し前記歯車対を構成する 歯車を枢支する軸を揷通させてなる軸受穴、前記めがね穴に連通し低圧の作動液を 吸入する低圧側ポート、前記めがね穴に連通し高圧の作動液を排出する高圧側ポ ート、及びこの高圧側ポート近傍に設けられバルブを取り付け可能なバルブ取付部 を有するボディと、このボディの前方又は後方のうち少なくとも一方に設けられ前記め がね穴を閉塞するカバーとを具備するものであって、前記ボディが、前記バルブ取付 部から低圧側ポートまでを連通する戻り通路を前記軸受穴に対応する前後方向位置 にさらに有することを特徴とする。 [0007] That is, the gear pump according to the present invention includes one or a plurality of gear pairs formed by combining a driving gear and a driven gear, and a casing that houses the gear pairs, and the casing force The gear pair A bearing hole formed by passing through a shaft for pivotally supporting the gear constituting the gear pair, a low pressure side port communicating with the glasses hole and sucking low pressure hydraulic fluid, A body having a high-pressure side port that communicates with the eyeglass hole and discharges high-pressure hydraulic fluid, a valve mounting portion provided in the vicinity of the high-pressure side port to which a valve can be attached, and at least one of the front and rear of the body A cover that is provided on one side and closes the eyeglass hole, wherein the body communicates with the bearing hole a return passage that communicates from the valve mounting portion to the low pressure side port. And further comprising a front-rear direction position.
[0008] このようなものであれば、ボディの前記軸受穴を設けた部位は前記めがね穴を設け た部位よりも厚肉であるため、戻り通路を設けてもボディの強度は大きく損なわれない 。すなわち、ボディの強度を大きく損ねることなく戻り通路を設け、このような歯車ボン プ又はモータを配設する際の部品点数及び取り付けスペースの節減を図ることがで きる。さらに、ボディのめがね穴周囲の部位を厚肉にして該部位に戻り通路を設ける 態様と比較して、ボディ自体を従来のものと比較して厚肉に構成する必要がな 、ため 、ボディを製造する際の材料費を節減できる。なお、「前記軸受穴に対応する前後方 向位置」とは、前記軸受穴が存在し前記めがね穴が存在しない前後方向位置全般を 含む概念である。 In such a case, the portion of the body provided with the bearing hole is thicker than the portion provided with the eyeglass hole, so that the strength of the body is not greatly impaired even if a return passage is provided. . That is, it is possible to reduce the number of parts and the installation space when arranging such a gear pump or motor by providing a return passage without significantly reducing the strength of the body. Furthermore, the body itself does not need to be made thicker than the conventional one as compared with the aspect in which the part around the eyeglass hole of the body is made thicker and the return passage is provided in the part. Material costs for manufacturing can be reduced. The “front-rear direction position corresponding to the bearing hole” is a concept including all the front-rear direction positions where the bearing hole exists and the eyeglass hole does not exist.
発明の効果  The invention's effect
[0009] 本発明は、以上説明したような形態で実施され、以下に記載されるような効果を奏 する。  [0009] The present invention is implemented in the form described above, and has the following effects.
[0010] すなわち、本発明によれば、軸受穴に対応する前後方向位置ではボディが比較的 厚肉であることを利用し、このような位置に戻り通路を設けることにより、ボディの強度 を大きく損ねることなく戻り通路を設け、このような歯車ポンプ又はモータを配設する 際の部品点数及び取り付けスペースの節減を図ることができる。さらに、ボディのめが ね穴周囲の部位を厚肉にして該部位に戻り通路を設ける態様と比較して、ボディ自 体を従来のものと比較して厚肉に構成する必要がな 、ため、ボディを製造する際の 材料費を節減できる。 That is, according to the present invention, by utilizing the fact that the body is relatively thick at the front-rear position corresponding to the bearing hole, the strength of the body is provided by providing a return passage at such a position. A return passage is provided without greatly impairing the number of parts, and the number of parts and the installation space when such a gear pump or motor is disposed can be reduced. Furthermore, the body itself does not need to be made thicker than the conventional one, as compared to a mode in which the part around the eyeglass hole of the body is thickened and a return passage is provided in the part. The material cost when manufacturing the body can be saved.
図面の簡単な説明  Brief Description of Drawings
[0011] [図 1]本発明の第 1の実施形態における歯車ポンプを示す側面断面図。 FIG. 1 is a side sectional view showing a gear pump according to a first embodiment of the present invention.
[図 2]同実施形態における歯車ポンプを示す左側面図。  FIG. 2 is a left side view showing the gear pump in the same embodiment.
[図 3]同実施形態における歯車ポンプを示す右側面図。  FIG. 3 is a right side view showing the gear pump in the same embodiment.
[図 4]図 1における X— X断面図。  FIG. 4 is a sectional view taken along line XX in FIG.
[図 5]本発明の第 2の実施形態における歯車ポンプを示す側面断面図。  FIG. 5 is a side sectional view showing a gear pump according to a second embodiment of the present invention.
[図 6]図 5における Y— Y断面図。  [Fig. 6] Y—Y sectional view in FIG.
[図 7]従来の歯車ポンプを示す側面断面図。  FIG. 7 is a side sectional view showing a conventional gear pump.
[図 8]図 7における Z— Z断面図。  FIG. 8 is a ZZ cross-sectional view in FIG.
符号の説明  Explanation of symbols
[0012] 1、Α1· ··歯車ポンプ [0012] 1, Α1 ... Gear pump
2、 Α2…ケーシング  2, Α2 ... casing
3、 A3· ··フロント力パー  3, A3 ... front force par
4、 Α4· ··ボディ  4, Α4 body
4a、 4b…第 1、第 2のめがね穴  4a, 4b ... 1st and 2nd eyeglass holes
A4a…めがね穴  A4a ... Glass hole
4x、 4y、 A4x、 A4y…軸受穴  4x, 4y, A4x, A4y ... Bearing hole
41、 42· ··第 1、第 2の高圧側流路ロ  41, 42 ... 1st and 2nd high pressure side flow paths
Α41· ··高圧側流路ロ  Α41 ···· High pressure side flow path
43、 A43…低圧側流路ロ  43, A43… Low pressure side flow path
44、 Α44· ··ノ レブ取付部  44, Α44
45、 Α45· ··戻り通路  45, Α45 ··· Return passage
5· ··リアカバー 6、 7…第 1、第 2の歯車対 5 ··· Rear cover 6, 7 ... 1st and 2nd gear pairs
Α6· · ·歯車対  Α6 ...
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0013] まず、本発明の第 1の実施形態を図 1及び図 2を参照しつつ以下に説明する。  First, a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
[0014] 本発明が提供する歯車ポンプ 1は、第 1及び第 2の歯車対 6、 7を有する二連歯車 ポンプである。この歯車ポンプ 1は、縦断面図を図 1、左側面図を図 2、右側面図を図 3、図 1における X— X断面図を図 4にそれぞれ示すように、第 1の歯車対 6は第 1の 駆動歯車 61と第 1の従動歯車 62とを嚙み合わせて構成している。一方、第 2の歯車 対 7は第 2の駆動歯車 71と第 2の従動歯車 72とを嚙み合わせて構成している。そし て、これら第 1及び第 2の歯車対 6、 7を、フロントカバー 3、ボディ 4、及びリアカバー 5 力もなるケーシング 2内に収納している。  The gear pump 1 provided by the present invention is a dual gear pump having first and second gear pairs 6 and 7. This gear pump 1 has a first gear pair 6 as shown in FIG. 1 for a longitudinal sectional view, FIG. 2 for a left side view, FIG. 3 for a right side view, and FIG. 4 for a XX sectional view in FIG. The first driving gear 61 and the first driven gear 62 are combined together. On the other hand, the second gear pair 7 is configured by combining a second drive gear 71 and a second driven gear 72 together. The first and second gear pairs 6 and 7 are accommodated in a casing 2 that also has front cover 3, body 4 and rear cover 5 force.
[0015] より具体的には、前記ボディ 4の前後両端部に第 1及び第 2のめがね穴 4a、 4bを設 けているとともに、このボディ 4の中間部に両歯車対 6、 7を区分けする中間隔壁 4W が形成されている。前記第 1のめがね穴 4aとフロントカバー 3とで形成される室内に は第 1の歯車対 6を収納していて、前記第 2のめがね穴 4bとリアカバー 5とで形成され る室内には第 2の歯車対 7を収納している。また、前記中間隔壁 4Wには、前記第 1 及び第 2のめがね穴 4a、 4bにそれぞれ連通するとともに、第 1の駆動歯車 61を枢支 する入出力軸 611及び第 2の駆動歯車 71を枢支する軸 711を挿通させてなる軸受 穴 4xを設けている。また、前記中間隔壁 4Wには、前記第 1及び第 2のめがね穴 4a、 4bにそれぞれ連通するとともに、第 1の従動歯車 62を枢支する軸 621及び第 2の従 動歯車 72を枢支する軸 721をそれぞれ挿通させてなる軸受穴 4yも設けている。  More specifically, first and second eyeglass holes 4 a and 4 b are provided at both front and rear ends of the body 4, and the pair of gears 6 and 7 are divided into an intermediate portion of the body 4. An intermediate partition wall 4W is formed. A first gear pair 6 is housed in the chamber formed by the first eyeglass hole 4a and the front cover 3, and the room formed by the second eyeglass hole 4b and the rear cover 5 is 2 gear pairs 7 are housed. The intermediate partition wall 4W communicates with the first and second eyeglass holes 4a and 4b, respectively, and pivots an input / output shaft 611 and a second drive gear 71 that pivotally support the first drive gear 61. A bearing hole 4x through which the supporting shaft 711 is inserted is provided. The intermediate partition wall 4W communicates with the first and second eyeglass holes 4a and 4b, respectively, and pivotally supports a shaft 621 and a second driven gear 72 that pivot the first driven gear 62. There are also provided bearing holes 4y through which the shafts 721 to be inserted are inserted.
[0016] また、フロントカバー 3、及びリアカバー 5は、この種の二連歯車ポンプに用いられる ものとして周知のものと同様の構成を有する。すなわち、フロントカバー 3には、前記 入出力軸 611を挿通させてなる軸受穴 3x、及び第 1の従動歯車 62を枢支する軸 62 1を挿通させてなる軸受穴 3yを設けている。一方、リアカバー 5には、第 2の駆動歯車 71を枢支する軸 711を挿通させてなる軸受穴 5x、及び第 2の従動歯車 72を枢支す る軸 721を揷通させてなる軸受穴 5yを設けている。そして、フロントカバー 3、ボディ 4 、及びリアカバー 5は、固定用ボルト 8により一体的に固定している。なお、前記フロン トカバー 3と前記入出力軸 611との間には、オイルシール 91を設けている。 [0016] Further, the front cover 3 and the rear cover 5 have the same configuration as that known for use in this type of dual gear pump. That is, the front cover 3 is provided with a bearing hole 3x through which the input / output shaft 611 is inserted and a bearing hole 3y through which the shaft 621 pivotally supporting the first driven gear 62 is inserted. On the other hand, the rear cover 5 has a bearing hole 5x through which a shaft 711 for pivotally supporting the second drive gear 71 and a shaft 721 for pivotally supporting the second driven gear 72 are inserted. 5y is provided. The front cover 3, the body 4, and the rear cover 5 are integrally fixed by fixing bolts 8. In addition, the Freon An oil seal 91 is provided between the cover 3 and the input / output shaft 611.
[0017] 第 1の駆動歯車 61は、入出力軸 611と一体的に形成されている。この入出力軸 61 1は、前記フロントカバー 3の軸受穴 3x内、及び前記ボディ 4の軸受穴 4x内に配した ブッシュ 92によってケーシング 2に対して支持されている。第 1の従動歯車 62も、軸 6 21と一体的に形成されている。この軸 621は、前記フロントカバー 3の軸受穴 3y内、 及び前記ボディ 3の軸受穴 4y内に配したブッシュ 92によってケーシング 2に対して支 持されている。また、第 2の駆動歯車 71は、軸 711と一体的に形成されている。この 軸 711は、第 1の駆動歯車 61と同一軸心上にて前記ボディ 4の軸受穴 4x内、および 前記リアカバー 5の軸受穴 5x内に配したブッシュ 92によってケーシング 2に対して支 持されている。ここで、この第 2の駆動歯車 71を支持する軸 711は前記入出力軸 61 1の軸端に固定していて、従って、第 2の駆動歯車 71は第 1の駆動歯車 61と同期回 転駆動される。さらに、第 2の従動歯車 72も、軸 721と一体的に形成されている。この 軸 721は、第 1の従動歯車 62と同一軸心上にて前記ボディ 4の軸受穴 4y内、および 前記リアカバー 5の軸受穴 5y内に配したブッシュ 92によってケーシング 2に対して支 持されている。しかし、この第 2の従動歯車 72を支持する軸 721は、第 1の従動歯車 62を支持する軸 621と完全に別体をなし、これら第 1の従動歯車 62及び第 2の従動 歯車 72は、それぞれ第 1の駆動歯車 61及び第 2の駆動歯車 71により別々に駆動さ れる。 The first drive gear 61 is formed integrally with the input / output shaft 611. The input / output shaft 611 is supported to the casing 2 by a bush 92 disposed in the bearing hole 3x of the front cover 3 and in the bearing hole 4x of the body 4. The first driven gear 62 is also formed integrally with the shaft 621. The shaft 621 is supported to the casing 2 by a bush 92 disposed in the bearing hole 3y of the front cover 3 and in the bearing hole 4y of the body 3. Further, the second drive gear 71 is formed integrally with the shaft 711. The shaft 711 is supported to the casing 2 by a bush 92 arranged in the bearing hole 4x of the body 4 and in the bearing hole 5x of the rear cover 5 on the same axis as the first drive gear 61. ing. Here, the shaft 711 supporting the second drive gear 71 is fixed to the shaft end of the input / output shaft 611, and therefore the second drive gear 71 is synchronized with the first drive gear 61. Driven. Further, the second driven gear 72 is also formed integrally with the shaft 721. The shaft 721 is supported on the casing 2 by a bush 92 disposed in the bearing hole 4y of the body 4 and in the bearing hole 5y of the rear cover 5 on the same axis as the first driven gear 62. ing. However, the shaft 721 that supports the second driven gear 72 is completely separate from the shaft 621 that supports the first driven gear 62, and the first driven gear 62 and the second driven gear 72 are These are driven separately by the first drive gear 61 and the second drive gear 71, respectively.
[0018] また、ボディ 4には、前記図 2及び図 3に示すように、一側面に第 1及び第 2の高圧 側流路ロ 41、 42、他側面には低圧側流路ロ 43を設けている。第 1及び第 2の歯車 対 6、 7がポンプとして作動するときは、低圧側流路ロ 43が流入口となり、第 1及び第 2の高圧側流路ロ 41、 42が吐出口となる。第 1及び第 2の高圧側流路ロ 41、 42は、 それぞれ第 1の歯車対 6を収納する第 1のめがね穴 4a、及び第 2の歯車対 7を収納 する第 2のめがね穴 4bに連通させている。一方、低圧側流路ロ 43は、前記第 1及び 第 2のめがね穴 4a、 4bに連通し前後方向に延伸する接続部 431と、この接続部 431 の中間から前記他側面に向けて穿設した開口部 432とからなる。  In addition, as shown in FIGS. 2 and 3, the body 4 has first and second high-pressure side flow paths 41 and 42 on one side and a low-pressure side flow path 43 on the other side. Provided. When the first and second gear pairs 6 and 7 operate as a pump, the low pressure side flow path B 43 becomes an inflow port, and the first and second high pressure side flow paths B 41 and 42 become discharge ports. The first and second high pressure side passages 41 and 42 are respectively provided in the first eye hole 4a for accommodating the first gear pair 6 and the second eye hole 4b for accommodating the second gear pair 7. Communicate. On the other hand, the low pressure side flow path B 43 is connected to the first and second eyeglass holes 4a, 4b and extends in the front-rear direction, and is drilled from the middle of the connection part 431 toward the other side surface. The opening 432 is made of.
[0019] さらに本実施形態では、ボディ 4の前記高圧側流路ロ 41、 42を設けた一側面に、 さらにリリーフ弁に代表されるバルブ(図示略)を取り付け可能なバルブ取付部 44を 設けている。そして、このバルブ取付部 44と前記低圧側流路ロ 43とを連通させるベ ぐ前記軸受穴 4x、 4yと前後位置を一致させて戻り通路 45を設けている。すなわち 前記中間隔壁 4Wに戻り通路 45を設けている。より具体的には、前記開口部 432か ら、軸受穴 4xの軸心からの距離を略一定に保ちつつ前記ノ レブ取付部 44に達する 形状の穴を穿設し、この穴を戻り通路 45としている。 Furthermore, in the present embodiment, a valve mounting portion 44 to which a valve (not shown) represented by a relief valve can be further attached to one side surface of the body 4 provided with the high pressure side flow paths 41 and 42. Provided. A return passage 45 is provided in such a way that the front and rear positions of the bearing holes 4x and 4y are made to communicate with the valve mounting portion 44 and the low pressure side flow passage 43. That is, a return passage 45 is provided in the intermediate partition wall 4W. More specifically, a hole having a shape reaching the nozzle mounting portion 44 is drilled from the opening 432 while keeping the distance from the shaft center of the bearing hole 4x substantially constant, and this hole is returned to the return passage 45. It is said.
[0020] この歯車ポンプ 1の作動時には、従来の二連歯車ポンプと同様に、低圧側流路ロ 4 3から作動液を第 1の駆動歯車 61と第 1の従動歯車 62の歯溝、及び第 2の駆動歯車 71と第 2の従動歯車 72の歯溝にそれぞれ供給し、第 1の駆動歯車 61と第 1の従動 歯車 62の歯溝に供給した作動液を第 1の高圧側流路ロ 41から、また、第 2の駆動歯 車 71と第 2の従動歯車 72の歯溝に供給した作動液を第 2の高圧側流路ロ 42からそ れぞれ吐出する。その際、軸受穴 4xに支持させている入出力軸 611及び軸 711は、 液圧により図 4における右下方に向力う作用を受ける。  [0020] During operation of the gear pump 1, as in the conventional dual gear pump, the working fluid is supplied from the low pressure side flow path B 43 to the tooth grooves of the first drive gear 61 and the first driven gear 62, and The hydraulic fluid supplied to the tooth grooves of the second drive gear 71 and the second driven gear 72 respectively and supplied to the tooth grooves of the first drive gear 61 and the first driven gear 62 is supplied to the first high-pressure side flow path. B and the hydraulic fluid supplied to the tooth spaces of the second drive gear 71 and the second driven gear 72 are discharged from the second high-pressure side flow passage b. At that time, the input / output shaft 611 and the shaft 711 supported by the bearing hole 4x are subjected to an action of urging to the lower right in FIG.
[0021] そして、前記バルブ取付部 44に取り付けたバルブ(図示略)を作動させた際には、 作動液が前記戻り通路 45を経て前記低圧側流路ロ 43の前記開口部 432に戻され る。  [0021] When a valve (not shown) attached to the valve attachment portion 44 is operated, the working fluid is returned to the opening 432 of the low-pressure side flow passage 43 through the return passage 45. The
[0022] 本実施形態に力かる歯車ポンプ 1の構成によれば、前記ボディ 4の前記めがね穴 4 aを設けた部位よりも厚肉な中間隔壁 4Wに、前記バルブ取付部 44から低圧側ポート 43までを連通する戻り通路 45を前記軸受穴に前後方向位置を一致させて設けてい るので、戻り通路 45を設けてもボディ 4の強度は大きく損なわれない。また、本実施 形態では、前記戻り通路を図 4における軸受穴 4xの上方、すなわち軸受穴 4xに対し て該軸受穴 4xに支持させて 、る入出力軸 611及び軸 711が液圧により受ける作用と 略反対側に設けているので、この点からも戻り通路 45を設けることによるボディ 4の強 度の損失は小さい。すなわち、ボディ 4の強度を大きく損ねることなく戻り通路 45を設 け、このような歯車ポンプ 1及びバルブを配設する際の部品点数及び取り付けスぺー スの節減を図ることができる。さらに、ボディ 4のめがね穴 4a周囲の部位を厚肉にして 該部位にリリーフ通路を設ける態様と比較して、ボディ 4自体を従来のものと比較して 厚肉に構成する必要がないため、ボディ 4を製造する際の材料費も節減できる。  [0022] According to the configuration of the gear pump 1 that is effective in the present embodiment, the intermediate wall 4W that is thicker than the portion of the body 4 where the eyeglass holes 4a are provided is connected to the low pressure side port from the valve mounting portion 44. Since the return passage 45 communicating up to 43 is provided in the bearing hole so that the position in the front-rear direction coincides, the strength of the body 4 is not greatly impaired even if the return passage 45 is provided. In this embodiment, the input / output shaft 611 and the shaft 711 are supported by the hydraulic pressure by supporting the return passage above the bearing hole 4x in FIG. 4, that is, with respect to the bearing hole 4x. From this point, the loss of strength of the body 4 due to the provision of the return passage 45 is small. That is, the return passage 45 can be provided without greatly degrading the strength of the body 4, and the number of parts and the mounting space can be reduced when the gear pump 1 and the valve are disposed. Furthermore, the body 4 itself does not need to be made thicker than the conventional one as compared to the case where the part around the eyeglass hole 4a of the body 4 is made thicker and the relief passage is provided in the part. Material costs for manufacturing the body 4 can also be reduced.
[0023] 次いで、本発明の第 2の実施形態を図 5及び図 6を参照しつつ以下に説明する。 [0024] この実施形態に力かる歯車ポンプ Alは、縦断面図を図 5、図 5における Y—Y断面 図を図 6にそれぞれ示すように、 1つの歯車対 A6と、この歯車対 A6を収納しフロント カバー A3及びボディ A4カゝらなるケーシング A2とを具備する。前記歯車対 A6は第 1 の駆動歯車 A61と第 1の従動歯車 A62とを嚙み合わせて構成している。 Next, a second embodiment of the present invention will be described below with reference to FIGS. 5 and 6. [0024] The gear pump Al that works in this embodiment has a gear pair A6 and a gear pair A6 as shown in FIG. 5 in a longitudinal sectional view and in FIG. 6 in a YY sectional view in FIG. A casing A2 comprising a front cover A3 and a body A4 is provided. The gear pair A6 is constructed by combining a first drive gear A61 and a first driven gear A62.
[0025] より具体的には、前記ボディ A4の前端部にめがね穴 A4aを設けていて、このめが ね穴 A4aとフロントカバー A3とで形成される空間に歯車対 A6を収納して 、る。また、 ボディ A4には、前記めがね穴 A4aに連通するとともに、駆動歯車 A61を枢支する入 出力軸 A611、及び従動歯車 A62を枢支する軸 A621をそれぞれ挿通させてなる軸 受穴 A4x、 A4yを設けている。  More specifically, a spectacle hole A4a is provided in the front end portion of the body A4, and the gear pair A6 is housed in a space formed by the spectacle hole A4a and the front cover A3. . In addition, the body A4 is connected to the eyeglass hole A4a, and the bearing holes A4x, A4y are formed by inserting the input / output shaft A611 that pivotally supports the drive gear A61 and the shaft A621 that pivotally supports the driven gear A62, respectively. Is provided.
[0026] また、フロントカバー A3は、この種の歯車ポンプに用いられるものとして周知のもの と同様の構成を有する。すなわち、フロントカバー 3には、前記入出力軸 A611を挿 通させてなる軸受穴 A3x、及び従動歯車 A62を枢支する軸 A621を挿通させてなる 軸受穴 A3yを設けている。そして、フロントカバー A3及びボディ A4は、固定用ボルト A8により一体的に固定している。なお、前記フロントカバー A3と前記入出力軸 A61 1との間には、オイルシール A91を設けている。また、図 6において、前記めがね穴 A 4aは想像線により示して 、る。  [0026] Further, the front cover A3 has the same configuration as that well known as that used in this type of gear pump. That is, the front cover 3 is provided with a bearing hole A3x through which the input / output shaft A611 is inserted and a bearing hole A3y through which the shaft A621 pivotally supporting the driven gear A62 is inserted. The front cover A3 and the body A4 are integrally fixed with fixing bolts A8. An oil seal A91 is provided between the front cover A3 and the input / output shaft A611. In FIG. 6, the eyeglass hole A 4a is indicated by an imaginary line.
[0027] 駆動歯車 A61は入出力軸 A611と一体的に形成されている。この入出力軸 A611 は、ケーシング A2に対して、前記フロントカバー A3の軸受穴 A3x内、及び前記ボデ ィの軸受穴 A4x内に配したブッシュ A92によって支持されている。一方、従動歯車 A 62も軸 A621と一体的に形成されている。この軸 A621は、ケーシング A2に対し、フ ロントカバー A3の軸受穴 A3y内、及び前記ボディ A4の軸受穴 A4y内に配したブッ シュ A92によって支持されている。  The drive gear A61 is formed integrally with the input / output shaft A611. The input / output shaft A611 is supported with respect to the casing A2 by a bush A92 disposed in the bearing hole A3x of the front cover A3 and in the bearing hole A4x of the body. On the other hand, the driven gear A 62 is also formed integrally with the shaft A621. The shaft A621 is supported by the bush A92 disposed in the bearing hole A3y of the front cover A3 and the bearing hole A4y of the body A4 with respect to the casing A2.
[0028] また、ボディ A4には、一側面に高圧側流路口 A41、他側面には低圧側流路口 A4 3を設けている。歯車対 A6がポンプとして作動するときは、低圧側流路ロ A43が流 入口となり、高圧側流路ロ A41が吐出口となる。高圧側流路ロ A41は、前記歯車機 構 A6を収納するめがね穴 A4aに連通させている。一方、低圧側流路ロ A43は、前 記めがね穴 A4aに連通し後方に延伸する接続部 A431と、この接続部 A431の後端 部から前記他側面に向けて穿設した開口部 A432とからなる。なお、図 6において、 前記高圧側流路ロ A41は想像線により示している。 [0028] The body A4 is provided with a high-pressure side channel port A41 on one side surface and a low-pressure side channel port A43 on the other side surface. When the gear pair A6 operates as a pump, the low pressure side flow path A43 serves as the inlet, and the high pressure side flow path A41 serves as the discharge port. The high-pressure side flow path A41 is in communication with a glass hole A4a that houses the gear mechanism A6. On the other hand, the low-pressure side flow path A43 is formed from a connection portion A431 that communicates with the above-described glass hole A4a and extends rearward, and an opening portion A432 that is drilled from the rear end portion of the connection portion A431 toward the other side surface. Become. In FIG. The high-pressure side flow path B41 is indicated by an imaginary line.
[0029] さらに本実施形態では、ボディ A4の前記高圧側流路ロ A41を設けた一側面に、さ らにリリーフ弁に代表されるバルブ(図示略)を取り付け可能なバルブ取付部 A44を 設けている。そして、このバルブ取付部 A44と前記低圧側流路ロ A43とを連通させ るべぐ前記軸受穴 A4xと前後位置を一致させて戻り通路 A45を設けている。より具 体的には、前記開口部 A432から、第 1の軸受穴 A4xの軸心力 の距離を略一定に 保ちつつ前記バルブ取付部 A44に達する形状の穴を穿設し、この穴を戻り通路 A4 5として!/、る。 [0029] Further, in this embodiment, a valve mounting portion A44 to which a valve (not shown) represented by a relief valve can be attached is provided on one side surface of the body A4 where the high-pressure side flow path A41 is provided. ing. A return passage A45 is provided so that the front and rear positions of the bearing hole A4x for communicating the valve mounting portion A44 and the low pressure side flow path B43 are aligned. More specifically, a hole having a shape reaching the valve mounting part A44 is formed from the opening A432 while keeping the distance of the axial center force of the first bearing hole A4x substantially constant, and the hole is returned to this hole. Passage A4 5! /
[0030] この歯車ポンプ A1の作動時には、従来の歯車ポンプと同様に、低圧側流路ロ A4 3から作動液を駆動歯車 A61と従動歯車 A62の歯溝に供給し、この空間に供給した 作動液を高圧側流路ロ A41から吐出する。その際、軸受穴 A4xに支持させている入 出力軸 A611は、液圧により図 6における右下方に向力 作用を受ける。  [0030] When this gear pump A1 is operated, the hydraulic fluid is supplied from the low pressure side flow path A43 to the tooth gaps of the drive gear A61 and the driven gear A62 and supplied to this space, as in the conventional gear pump. The liquid is discharged from the high pressure side flow path A41. At this time, the input / output shaft A611 supported by the bearing hole A4x is subjected to a directional force action in the lower right direction in FIG.
[0031] そして、前記バルブ取付部 A44に取り付けたバルブ(図示略)を作動させた際には 、作動液が前記戻り通路 A45を経て前記低圧側流路ロ A43の前記開口部 A432〖こ 戻される。  [0031] When the valve (not shown) attached to the valve attachment portion A44 is operated, the working fluid passes through the return passage A45 and returns to the opening portion A432 of the low pressure side passage A43. It is.
[0032] 本実施形態に力かる歯車ポンプ A1の構成では、上述したように、前記ボディ A4の 前記軸受穴 A4xに前後方向位置を一致させて前記バルブ取付部 A44から低圧側 ポート A43までを連通する戻り通路 A45を設けている力 この部位はめがね穴 4aを 設けた部位よりも厚肉である。従って、戻り通路 A45の存在によりボディ A4の強度を 大きく損なわれない。また、本実施形態では、前記通路 A45を図 6における軸受穴 A 4xの上方、すなわち軸受穴 A4xに対して該軸受穴 A4xに支持させて 、る入出力軸 A611が液圧により受ける作用と略反対側に設けているので、この点力もも戻り通路 A45を設けることによるボディ A4の強度の損失は小さい。すなわち、ボディ A4の強 度を大きく損ねることなく戻り通路 A45を設け、このような歯車ポンプ A1及びバルブ を配設する際の部品点数及び取り付けスペースの節減を図ることができる。さらに、 ボディ A4のめがね穴 A4a周囲の部位を厚肉にして該部位に戻り通路を設ける態様 と比較して、ボディ A4自体を従来のものと比較して厚肉に構成する必要がな 、ため 、ボディ A4を製造する際の材料費も節減できる。 [0033] なお、本発明は以上に述べた第 1、第 2の実施形態に限られない。 [0032] In the configuration of the gear pump A1 that is effective in the present embodiment, as described above, the position from the valve mounting portion A44 to the low-pressure side port A43 is communicated with the bearing hole A4x of the body A4 by matching the position in the front-rear direction. The force providing the return passage A45 This part is thicker than the part provided with the glasses hole 4a. Therefore, the presence of the return passage A45 does not greatly impair the strength of the body A4. In the present embodiment, the passage A45 is supported above the bearing hole A4x in FIG. 6, that is, the bearing hole A4x with respect to the bearing hole A4x, so that the input / output shaft A611 is substantially affected by the hydraulic pressure. Since it is provided on the opposite side, the loss of strength of the body A4 due to the provision of the return passage A45 is small. In other words, the return passage A45 is provided without greatly impairing the strength of the body A4, and the number of parts and the installation space when the gear pump A1 and the valve are disposed can be reduced. Furthermore, the body A4 itself does not need to be made thicker than the conventional one, as compared with the embodiment in which the part around the spectacle hole A4a of the body A4 is thickened and the return passage is provided in the part. The material cost when manufacturing the body A4 can also be reduced. Note that the present invention is not limited to the first and second embodiments described above.
[0034] 例えば、 3対以上の歯車対を有する歯車ポンプに本発明を適用してもよい。 [0034] For example, the present invention may be applied to a gear pump having three or more pairs of gears.
[0035] また、 2対の歯車対を有する歯車ポンプを、上述した第 1の実施形態のような歯車ポ ンプでなく高圧側流路ロ及び低圧側流路口を 1つずつ有し 2対の歯車対の嚙み合 わせタイミングをずらした位相差歯車ポンプとして構成してももちろんよい。 [0035] Further, the gear pump having two pairs of gears has two pairs of high pressure side flow passages and one low pressure side flow passage port instead of the gear pumps as in the first embodiment described above. Of course, it may be configured as a phase difference gear pump in which the timing of meshing the gear pairs is shifted.
[0036] さらに、上述した第 2の実施形態のようにケーシングをフロントカバーとボディとによ り構成する代わりに、ボディとリアカバーとによりケーシングを構成し、このケーシング のボディの軸受穴を設けた部位、すなわちめがね穴より前方の部位にリリーフ通路を 設けるようにしてもよい。 [0036] Further, instead of configuring the casing by the front cover and the body as in the second embodiment described above, the casing is configured by the body and the rear cover, and the bearing hole of the body of the casing is provided. You may make it provide a relief channel | path in the site | part, ie, the site ahead of a spectacle hole.
[0037] カロえて、バルブ取付部に取り付けるバルブは、リリーフ弁に限らず、流量制御弁等、 他の種類のバルブであってももちろんよ!/、。 [0037] The valve attached to the valve mounting portion is not limited to the relief valve, but may be other types of valves such as a flow control valve! /.
[0038] その他、本発明の趣旨を損ねない範囲で種々に変更してもよい。 In addition, various modifications may be made without departing from the spirit of the present invention.
産業上の利用可能性  Industrial applicability
[0039] 本発明を活用すれば、ボディの軸受穴に対応する前後方向位置ではめがね穴に 対応する前後方向位置と比較してボディが比較的厚肉であることを利用し、このよう な位置に戻り通路を設けることにより、ボディの強度を大きく損ねることなく戻り通路を 設け、このような歯車ポンプを配設する際の部品点数及び取り付けスペースの節減を 図ることができる。さらに、ボディのめがね穴周囲の部位を厚肉にして該部位に戻り 通路を設ける態様と比較して、ボディ自体を従来のものと比較して厚肉に構成する必 要がないため、ボディを製造する際の材料費を節減できる。 [0039] By utilizing the present invention, it is possible to utilize the fact that the body is relatively thick at the front-rear position corresponding to the bearing hole of the body as compared with the front-rear position corresponding to the eyeglass hole. By providing a return passage, the return passage can be provided without greatly reducing the strength of the body, and the number of parts and the installation space can be reduced when installing such a gear pump. Furthermore, the body itself does not need to be made thicker than the conventional one, as compared to a mode in which the part around the eyeglass hole of the body is made thicker and a return passage is provided in the part. Material costs for manufacturing can be reduced.

Claims

請求の範囲 The scope of the claims
駆動歯車と従動歯車とを嚙合させてなる 1又は複数の歯車対と、この歯車対を収納 するケーシングとを具備し、前記ケーシングが、前記歯車対を収納するめがね穴、こ のめがね穴に連通し前記歯車対を構成する歯車を枢支する軸を揷通させてなる軸 受穴、前記めがね穴に連通し低圧の作動液を吸入する低圧側ポート、前記めがね 穴に連通し高圧の作動液を排出する高圧側ポート、及びこの高圧側ポート近傍に設 けられバルブを取り付け可能なバルブ取付部を有するボディと、このボディの前方又 は後方のうち少なくとも一方に設けられ前記めがね穴を閉塞するカバーとを具備する ものであって、 One or a plurality of gear pairs formed by combining a driving gear and a driven gear, and a casing for housing the gear pairs, the casing communicates with a glasses hole for housing the gear pair, and the glasses holes. A bearing hole formed by passing a shaft that pivotally supports the gears constituting the gear pair, a low pressure side port that communicates with the eyeglass hole and sucks low pressure hydraulic fluid, and a high pressure hydraulic fluid that communicates with the eyeglass hole. A high pressure side port that discharges water and a body having a valve mounting portion that is provided near the high pressure side port to which a valve can be mounted, and at least one of the front and rear of the body, and closes the eyeglass hole. And a cover,
前記ボディ力 前記バルブ取付部力 低圧側ポートまでを連通する戻り通路を前記 軸受穴に対応する前後方向位置にさらに有することを特徴とする歯車ポンプ。  The gear pump further comprising a return passage communicating with the body force, the valve mounting portion force, and the low pressure side port at a position in the front-rear direction corresponding to the bearing hole.
PCT/JP2006/317872 2006-09-08 2006-09-08 Gear pump WO2008029477A1 (en)

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JP2008533020A JP4952719B2 (en) 2006-09-08 2006-09-08 Gear pump
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CN102257275A (en) * 2008-12-16 2011-11-23 罗伯特·博世有限公司 Internal gear pump
WO2010082966A1 (en) * 2009-01-19 2010-07-22 Access Business Group International Llc Method and apparatus for dispensing fluid compositions
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KR101146501B1 (en) 2012-05-29
TWI378181B (en) 2012-12-01
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TW200813331A (en) 2008-03-16

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