JPWO2009044491A1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
JPWO2009044491A1
JPWO2009044491A1 JP2009535948A JP2009535948A JPWO2009044491A1 JP WO2009044491 A1 JPWO2009044491 A1 JP WO2009044491A1 JP 2009535948 A JP2009535948 A JP 2009535948A JP 2009535948 A JP2009535948 A JP 2009535948A JP WO2009044491 A1 JPWO2009044491 A1 JP WO2009044491A1
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Prior art keywords
housing
housings
gear pump
particles
gear
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JP2009535948A
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Japanese (ja)
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健幸 島村
健幸 島村
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KYB Corp
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KYB Corp
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/102—Adjustment of the interstices between moving and fixed parts of the machine by means other than fluid pressure
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • 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
    • F04C2240/10—Stators
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/70—Safety, emergency conditions or requirements

Abstract

一対のギヤ（１１、１２）が噛み合いながら回転して流体を吐出するギヤポンプ（１）であって、各ギヤ（１１、１２）が組み込まれるボディ（２）と、このボディ（２）に接するハウジング（３、４）と、互いに接するボディ（２）の端面（２５、２６）とハウジング（３、４）の端面（２８、２９）との間に介在しボディ（２）とハウジング（３、４）との位置ずれを防止する多数の粒子（３０）と、ボディ（２）にハウジング（３、４）を締結する締結部材（１７〜２０）とを備える。A gear pump (1) for discharging fluid by rotating while meshing with a pair of gears (11, 12), a body (2) in which each gear (11, 12) is incorporated, and a housing in contact with the body (2) (3, 4) and the end faces (25, 26) of the body (2) in contact with each other and the end faces (28, 29) of the housing (3, 4). ) And a plurality of particles (30) for preventing positional displacement, and fastening members (17 to 20) for fastening the housings (3, 4) to the body (2).

Description

この発明は、一対のギヤが噛み合いながら回転して流体を吐出するギヤポンプに関する。   The present invention relates to a gear pump that rotates while discharging a fluid while a pair of gears are engaged with each other.

油圧装置や水圧装置等に設けられるギヤポンプは、一対のギヤが組み込まれるボディと、このボディに接するハウジングとを備え、ボディとハウジングが複数のボルトによって締結されている。
ギヤポンプの作動時にボディ内に生じる流体圧力によりボディに対してハウジングを一方向に移動させようとする力が生じる。
従来のギヤポンプとして、特開平６−１４７１３３号公報に開示されたものは、ボディのハウジングに接する端面に加工目が形成される。ボディとハウジングとを複数のボルトで締結すると、ボディの端面に刻まれた筋状の加工目がハウジングの端面に食い込み、ボディとハウジングとの位置ずれを防止するようになっている。A gear pump provided in a hydraulic device, a hydraulic device, or the like includes a body in which a pair of gears are incorporated and a housing in contact with the body, and the body and the housing are fastened by a plurality of bolts.
A force is generated to move the housing in one direction relative to the body by the fluid pressure generated in the body when the gear pump is operated.
A conventional gear pump disclosed in Japanese Patent Application Laid-Open No. 6-147133 has a machined surface formed on an end surface thereof in contact with the housing of the body. When the body and the housing are fastened with a plurality of bolts, streak-like processed marks carved on the end surface of the body bite into the end surface of the housing, thereby preventing positional displacement between the body and the housing.

しかしながら、ボディの端面に刻まれる加工目は、その削り深さが小さいと、ボディとハウジングとの位置ずれを十分に防止できない。
一方、加工目の削り深さが大きいと、ボディとハウジングとの間に隙間が生じ、ギヤポンプから流体が洩る可能性がある。
従って、本発明は、ボディの端面に刻まれる加工目の削り深さを大きくすることなく、ボディとハウジングとの位置ずれを防止するギヤポンプを提供することを目的とする。
本発明は、一対のギヤが噛み合いながら回転して流体を吐出するギヤポンプであって、各ギヤが組み込まれるボディと、このボディに接するハウジングと、互いに接するボディの端面とハウジングの端面との間に介在しボディとハウジングとの位置ずれを防止する多数の粒子と、ボディにハウジングを締結する複数の締結部材とを備えることを特徴とする。
本発明によれば、ボディの端面とハウジングの端面との間に多数の微細な粒子が介在し、互いの接合部の摩擦力を高めることにより、ギヤポンプ内の流体圧力によってボディとハウジングとの間に位置ずれが生じることを有効に防止でき、ギヤポンプのポンプ効率を維持できる。However, if the machining depth carved on the end surface of the body is small, the positional deviation between the body and the housing cannot be sufficiently prevented.
On the other hand, if the machining depth is large, a gap may be formed between the body and the housing, and fluid may leak from the gear pump.
Accordingly, an object of the present invention is to provide a gear pump that prevents positional displacement between the body and the housing without increasing the depth of machining cut on the end face of the body.
The present invention is a gear pump that rotates while discharging a fluid while a pair of gears mesh with each other, and includes a body in which each gear is incorporated, a housing that is in contact with the body, and an end surface of the body that is in contact with the body It is characterized by comprising a large number of intervening particles that prevent displacement of the body and the housing, and a plurality of fastening members that fasten the housing to the body.
According to the present invention, a large number of fine particles are interposed between the end face of the body and the end face of the housing, and the frictional force of the joint portion is increased, so that the fluid pressure in the gear pump causes the gap between the body and the housing. It is possible to effectively prevent the position deviation from occurring and maintain the pump efficiency of the gear pump.

図１は、本発明の実施の形態のギヤポンプを示す縦断面図である。
図２は、図１のＡ−Ａ線に沿う断面図である。FIG. 1 is a longitudinal sectional view showing a gear pump according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.

以下、図面を参照して、本発明の実施の形態について説明する。
図１に示すように、ギヤポンプ１は、一対のギヤとしてドライブギヤ１１、ドリブンギヤ１２が組み込まれるボディ２と、このボディ２に両側から接するハウジング３、４とを備える。ドライブギヤ１１、ドリブンギヤ１２の両端面とハウジング３、４との間にはサイドプレート５、６が介装される。
ボディ２は、その内側にドライブギヤ１１、ドリブンギヤ１２を収容するギヤ室９を有し、ボディ２の両端面２５、２６にはハウジング３、４が接する。
ハウジング３は、ボディ２の端面２５に接する端面２８を有し、ボディ２の一端を塞ぐとともに、図示しない支持部材に取り付けられるマウンティングフランジとして機能する。
ボディ２の端面２５とハウジング３との間にはシールリング４１が介装され、このシールリング４１によってギヤ室９が密封される。
なお、ハウジング３をボディ２と一体に形成してもよい。
ハウジング４は、ボディ２の端面２６に接する端面２９を有し、ボディ２の他端を塞ぐカバーとして機能する。
ボディ２の端面２６とハウジング４との間にはシール４２が介装され、このシール４２によってギヤ室９が密封される。
ボディ２とハウジング３、４とは、４本のボルト１７〜２０によって締結される。締結部材として設けられる各ボルト１７〜２０は、それぞれの軸力によってボディ２の端面２５とハウジング３の端面２８とが互いに押し付けられるとともに、ボディ２の端面２６とハウジング４の端面２９とが互いに押し付けられる。これにより、各端面２５と端面２８間に生じる摩擦力と、各端面２６と端面２９間に生じる摩擦力によってボディ２とハウジング３、４とが固定される。
ドライブギヤ１１の両端には軸１３、１５が形成される。ドリブンギヤ１２の両端には軸１４、１６が形成される。各軸１３、１４は、ハウジング３に軸受３３、３４を介して回転自在に支持される。各軸１５、１６は、カバー４に軸受３５、３６を介して回転自在に支持される。
ドライブギヤ１１の軸１５が図２において矢印で示すように時計回り方向に回転駆動され、ドリブンギヤ１２の軸１６が図２において矢印で示すように反時計回り方向に回転する。
ギア室９にてドライブギヤ１１とドリブンギヤ１２が噛み合いながら回転することにより、噛み合い面の接線方向に位置する低圧ポート２３から吸い込まれた流体が、ドライブギヤ１１とドリブンギヤ１２のギヤ噛み合い部によって運ばれ、高圧ポート２２から吐出される。ギヤポンプ１を循環する流体としては例えば作動油が用いられる。
上記したギヤポンプ１の作動時、高圧ポート２２の流体圧力が低圧ポート２３より高くなるため、ボディ２に対してハウジング３、４を互いの接合部において図２に矢印Ｂで示す方向に移動させようとする力が生じる。
このギヤポンプ１内に生じる圧力差に抗してボディ２に対してハウジング３、４を固定するために、図２に示すように、ボディ２の端面２６に加工目２７を形成する。同様に、ボディ２の端面２６に加工目２７を形成する。
この加工目２７は、フライス盤によって切削加工される多数の細い溝とからなる。加工目２７は、図２に矢印Ｂで示す滑り方向に対してほぼ直交する縦方向に延びるように形成される。
なお、加工目２７は、これに限らず、例えば網目状に形成してもよい。
ボディ２はハウジング３、４より硬度の高い材質で形成される。ボディ２は例えば鉄系材料で形成され、ハウジング３、４とはそれぞれ例えばアルミ系材料で形成される。
ボディ２にハウジング３、４を各ボルト１７〜２０によって締結することにより、ハウジング３、４の端面２８、２９に硬度の高いボディ２の加工目２７が食い込む。これにより、ギヤポンプ１内の流体圧力によってボディ２に対してハウジング３、４が移動する位置ずれを抑制する。
ところで、ボディ２の端面２５、２６に刻まれる加工目２７は、その削り深さが小さいと、ハウジング３、４の位置ずれを十分に防止できない。一方、加工目２７の削り深さが大きいと、ボディ２とハウジング３、４との間に隙間が生じ、ギヤポンプ１から流体洩れが生じる可能性がある。
これに対処して、本発明は、ボディ２とハウジング３、４との接合部に多数の微細な粒子３０を介在させ、加工目２７の削り深さを大きくすることなく、ボディ２とハウジング３、４との位置ずれを防止する構成とする。
粒子３０は例えば鋼、鋳鉄、カーボン材等の切削粉等を用い、ボディ２とハウジング３、４の材質より硬度が高い材質とする。
硬度の高い粒子３０を用いることにより、粒子３０がボディ２の端面２５、２６とハウジング３、４の端面２８、２９とにそれぞれ食い込み、ボディ２とハウジング３、４との接合部に沿っての摩擦力を高め、互いの間に位置ずれが生じることを有効に防止できる。
粒子３０はコーティング剤３１に混ぜ合わせ、コーティング剤３１と共にボディ２の両端面２５、２６に塗布する。
コーティング剤３１はボディ２とハウジング３、４との接合部に密着し隙間を無くすと共に電食等の腐食が生じることを防止するものである。
以上のように本発明は、ドライブギヤ１１、ドリブンギヤ１２が噛み合いながら回転して流体を吐出するギヤポンプ１であって、ドライブギヤ１１、ドリブンギヤ１２が組み込まれるボディ２と、このボディ２に接するハウジング３、４と、互いに接するボディ２の端面２５、２６とハウジング３、４の端面２８、２９との間に介在しボディ２とハウジング３、４との位置ずれを防止する多数の粒子３０と、ボディ２にハウジング３、４を締結する複数のボルト（締結部材）１７〜２０とを備える。
ボディ２の端面２５、２６とハウジング３、４の端面２８、２９との間に多数の粒子３０が介在することにより、ギヤポンプ１内の流体圧力によってボディ２とハウジング３、４との間に接合部に沿っての位置ずれが生じることを有効に防止でき、ギヤポンプ１のポンプ効率を維持できる。
本実施形態では、粒子３０をボディ２とハウジング３、４とに比べてその硬度が高い材質によって形成する。
これにより、硬度の高い粒子３０がボディ２の端面２５、２６とハウジング３、４の端面２８、２９とにそれぞれ食い込み、ギヤポンプ１内の流体圧力によってボディ２とハウジング３、４との間に位置ずれが生じることを有効に防止できる。
本実施形態では、ボディ２の端面２５、２６とハウジング３、４の端面２８、２９の少なくとも一方に加工目２７を形成し、粒子３０とこの加工目２７とを介してボディ２とハウジング３、４との位置ずれを防止する。
これにより、ボディ２とハウジング３、４とは、加工目２７によって位置決めされるとともに、粒子３０によっても位置決めされるため、加工目２７の削り深さを小さくしても、ハウジング３、４の位置ずれを十分に防止できる。この結果、加工目２７の削り深さを小さくして、ボディ２とハウジング３、４との間から流体が洩れることを防止できる。
本実施形態では、粒子３０をコーティング剤３１に混ぜ合わせ、ボディ２の端面２５、２６とハウジング３、４の端面２８、２９の少なくとも一方にコーティング剤３１と共に粒子３０を塗布する。
これにより、ボディ２の端面２５、２６またはハウジング３、４の端面２８、２９に粒子３０を均一に分布させることができるため、ギヤポンプ１内の流体圧力によってボディ２とハウジング３、４との間に位置ずれが生じることを有効に防止できる。
そして、コーティング剤３１に腐食防止剤を用いることにより、ボディ２とハウジング３、４との接合部に電食等の腐食が生じることを防止できる。
他の実施の形態として、粒子３０をボディ２とハウジング３、４とに比べてその硬度が低い材質によって形成し、ボディ２とハウジング３、４との間で圧縮される粒子３０を介して摩擦力を高める構成としてもよい。
他の実施の形態として、ボディ２の端面２５、２６とハウジング３、４の端面２８、２９の両方を平滑に形成し、加工目２７を用いることなくボディ２とハウジング３、４との位置決めを粒子３０のみによって行う構成としてもよい。Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the gear pump 1 includes a body 2 in which a drive gear 11 and a driven gear 12 are incorporated as a pair of gears, and housings 3 and 4 in contact with the body 2 from both sides. Side plates 5 and 6 are interposed between both end faces of the drive gear 11 and the driven gear 12 and the housings 3 and 4.
The body 2 has a gear chamber 9 that accommodates the drive gear 11 and the driven gear 12 therein, and the housings 3 and 4 are in contact with both end faces 25 and 26 of the body 2.
The housing 3 has an end surface 28 that contacts the end surface 25 of the body 2, closes one end of the body 2, and functions as a mounting flange that is attached to a support member (not shown).
A seal ring 41 is interposed between the end face 25 of the body 2 and the housing 3, and the gear chamber 9 is sealed by the seal ring 41.
The housing 3 may be formed integrally with the body 2.
The housing 4 has an end surface 29 that contacts the end surface 26 of the body 2, and functions as a cover that closes the other end of the body 2.
A seal 42 is interposed between the end face 26 of the body 2 and the housing 4, and the gear chamber 9 is sealed by the seal 42.
The body 2 and the housings 3 and 4 are fastened by four bolts 17 to 20. The bolts 17 to 20 provided as fastening members are pressed against each other by the axial force of the end surface 25 of the body 2 and the end surface 28 of the housing 3, and the end surface 26 of the body 2 and the end surface 29 of the housing 4 are pressed against each other. It is done. Accordingly, the body 2 and the housings 3 and 4 are fixed by the frictional force generated between the end surfaces 25 and 28 and the frictional force generated between the end surfaces 26 and 29.
Shafts 13 and 15 are formed at both ends of the drive gear 11. Shafts 14 and 16 are formed at both ends of the driven gear 12. The shafts 13 and 14 are rotatably supported by the housing 3 via bearings 33 and 34. The shafts 15 and 16 are rotatably supported by the cover 4 via bearings 35 and 36.
The shaft 15 of the drive gear 11 is driven to rotate clockwise as indicated by an arrow in FIG. 2, and the shaft 16 of the driven gear 12 is rotated counterclockwise as indicated by an arrow in FIG.
When the drive gear 11 and the driven gear 12 rotate in the gear chamber 9 while meshing with each other, the fluid sucked from the low pressure port 23 located in the tangential direction of the meshing surface is carried by the gear meshing portion of the drive gear 11 and the driven gear 12. And discharged from the high-pressure port 22. For example, hydraulic fluid is used as the fluid circulating through the gear pump 1.
When the gear pump 1 is operated, the fluid pressure of the high pressure port 22 becomes higher than that of the low pressure port 23. Therefore, the housings 3 and 4 are moved relative to the body 2 in the direction indicated by the arrow B in FIG. The power to be generated.
In order to fix the housings 3 and 4 against the body 2 against the pressure difference generated in the gear pump 1, as shown in FIG. 2, a machining line 27 is formed on the end surface 26 of the body 2. Similarly, a processed stitch 27 is formed on the end face 26 of the body 2.
The processing line 27 includes a large number of thin grooves that are cut by a milling machine. The processing eyes 27 are formed so as to extend in the vertical direction substantially orthogonal to the sliding direction indicated by the arrow B in FIG.
The processed stitch 27 is not limited to this, and may be formed in a mesh shape, for example.
The body 2 is formed of a material having higher hardness than the housings 3 and 4. The body 2 is made of, for example, an iron-based material, and the housings 3 and 4 are made of, for example, an aluminum-based material.
By fastening the housings 3 and 4 to the body 2 with the bolts 17 to 20, the machined holes 27 of the body 2 having high hardness bite into the end faces 28 and 29 of the housings 3 and 4. Thereby, the position shift which the housings 3 and 4 move with respect to the body 2 with the fluid pressure in the gear pump 1 is suppressed.
By the way, when the cut depth 27 of the machined marks 27 carved on the end faces 25 and 26 of the body 2 is small, the positional deviation of the housings 3 and 4 cannot be sufficiently prevented. On the other hand, if the cutting depth of the machining line 27 is large, a gap is generated between the body 2 and the housings 3 and 4, and fluid leakage from the gear pump 1 may occur.
In order to cope with this, the present invention interposes a large number of fine particles 30 at the joint between the body 2 and the housings 3 and 4, and does not increase the cutting depth of the machined eyes 27, and thus the body 2 and the housing 3. 4 is prevented from being displaced.
The particles 30 are made of, for example, cutting powder such as steel, cast iron, or carbon material, and have a higher hardness than that of the body 2 and the housings 3 and 4.
By using the particles 30 having high hardness, the particles 30 bite into the end surfaces 25 and 26 of the body 2 and the end surfaces 28 and 29 of the housings 3 and 4, respectively, and along the joint portion between the body 2 and the housings 3 and 4. It is possible to increase the frictional force and effectively prevent the positional deviation between each other.
The particles 30 are mixed with the coating agent 31 and applied to both end faces 25 and 26 of the body 2 together with the coating agent 31.
The coating agent 31 is in close contact with the joint portion between the body 2 and the housings 3 and 4 to eliminate a gap and prevent corrosion such as electrolytic corrosion.
As described above, the present invention is a gear pump 1 that discharges a fluid by rotating while meshing a drive gear 11 and a driven gear 12, and includes a body 2 in which the drive gear 11 and the driven gear 12 are incorporated, and a housing 3 in contact with the body 2. 4 and a large number of particles 30 interposed between the end surfaces 25 and 26 of the body 2 that are in contact with each other and the end surfaces 28 and 29 of the housings 3 and 4 to prevent displacement of the body 2 and the housings 3 and 4, 2 includes a plurality of bolts (fastening members) 17 to 20 for fastening the housings 3 and 4.
Since a large number of particles 30 are interposed between the end faces 25 and 26 of the body 2 and the end faces 28 and 29 of the housings 3 and 4, the body 2 and the housings 3 and 4 are joined by the fluid pressure in the gear pump 1. It is possible to effectively prevent the displacement along the portion, and the pump efficiency of the gear pump 1 can be maintained.
In the present embodiment, the particles 30 are formed of a material having a higher hardness than the body 2 and the housings 3 and 4.
Thereby, the particles 30 having high hardness bite into the end surfaces 25 and 26 of the body 2 and the end surfaces 28 and 29 of the housings 3 and 4, respectively, and are positioned between the body 2 and the housings 3 and 4 by the fluid pressure in the gear pump 1. It is possible to effectively prevent the deviation from occurring.
In the present embodiment, a processed stitch 27 is formed on at least one of the end surfaces 25 and 26 of the body 2 and the end surfaces 28 and 29 of the housings 3 and 4, and the body 2 and the housing 3, 4 is prevented from being displaced.
As a result, the body 2 and the housings 3 and 4 are positioned by the machining marks 27 and are also positioned by the particles 30. Misalignment can be sufficiently prevented. As a result, it is possible to reduce the cutting depth of the processing eyes 27 and prevent fluid from leaking between the body 2 and the housings 3 and 4.
In the present embodiment, the particles 30 are mixed with the coating agent 31, and the particles 30 are applied together with the coating agent 31 to at least one of the end faces 25 and 26 of the body 2 and the end faces 28 and 29 of the housings 3 and 4.
Accordingly, the particles 30 can be uniformly distributed on the end faces 25 and 26 of the body 2 or the end faces 28 and 29 of the housings 3 and 4, so that the fluid pressure in the gear pump 1 can cause a gap between the body 2 and the housings 3 and 4. It is possible to effectively prevent the positional deviation from occurring.
Further, by using a corrosion inhibitor for the coating agent 31, it is possible to prevent corrosion such as electrolytic corrosion from occurring at the joint portion between the body 2 and the housings 3 and 4.
In another embodiment, the particles 30 are formed of a material having a lower hardness than the body 2 and the housings 3 and 4, and friction is generated via the particles 30 compressed between the body 2 and the housings 3 and 4. It is good also as a structure which raises power.
As another embodiment, both the end surfaces 25 and 26 of the body 2 and the end surfaces 28 and 29 of the housings 3 and 4 are formed smoothly, so that the positioning of the body 2 and the housings 3 and 4 can be performed without using the machining eyes 27. It is good also as a structure performed only by the particle | grains 30. FIG.

本発明にかかるギヤポンプは、油圧装置や水圧装置等に設けられるポンプに適している。   The gear pump according to the present invention is suitable for a pump provided in a hydraulic device, a hydraulic device or the like.

Claims (4)

一対のギヤが噛み合いながら回転して流体を吐出するギヤポンプであって、各ギヤが組み込まれるボディと、このボディに接するハウジングと、互いに接するボディの端面とハウジングの端面との間に介在しボディとハウジングとの位置ずれを防止する多数の粒子と、ボディにハウジングを締結する締結部材とを備えることを特徴とするギヤポンプ。 A gear pump that rotates and discharges fluid while meshing with a pair of gears, a body in which each gear is incorporated, a housing that is in contact with the body, an end surface of the body that is in contact with each other, and an end surface of the housing, A gear pump comprising: a large number of particles that prevent positional displacement with a housing; and a fastening member that fastens the housing to the body. 前記粒子を前記ボディと前記ハウジングとに比べてその硬度が高い材質によって形成したことを特徴とする請求項１に記載のギヤポンプ。 The gear pump according to claim 1, wherein the particles are made of a material having a hardness higher than that of the body and the housing. 前記ボディの前記端面と前記ハウジングの前記端面の少なくとも一方に加工目を形成し、前記粒子とこの加工目とを介して前記ボディと前記ハウジングとの位置ずれを防止することを特徴とする請求項１に記載のギヤポンプ。 The machined surface is formed in at least one of the end surface of the body and the end surface of the housing, and positional displacement between the body and the housing is prevented via the particles and the processed eye. The gear pump according to 1. 前記粒子をコーティング剤に混ぜ合わせ、前記ボディの前記端面と前記ハウジングの前記端面の少なくとも一方にコーティング剤と共に前記粒子を塗布することを特徴とする請求項１に記載のギヤポンプ。 2. The gear pump according to claim 1, wherein the particles are mixed with a coating agent, and the particles are applied together with the coating agent to at least one of the end surface of the body and the end surface of the housing.
JP2009535948A 2007-10-02 2007-10-02 Gear pump Pending JPWO2009044491A1 (en)

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RU2448272C2 (en) * 2010-05-20 2012-04-20 Мирослав Георгиевич Георгиевский Gear hydraulic unit
CN101994691A (en) * 2010-09-30 2011-03-30 张良 Gear pump liquid supercharging equipment, and production process and application thereof
US9028222B2 (en) 2011-08-26 2015-05-12 Hamilton Sundstrand Corporation Variable output pump
US8845313B2 (en) * 2011-11-18 2014-09-30 Caterpillar Inc. Oil pump for an engine
CN105526160A (en) 2014-10-16 2016-04-27 德昌电机(深圳)有限公司 Gear pump
WO2021030710A1 (en) * 2019-08-14 2021-02-18 Viking Pump, Inc. High pressure pumping system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06147133A (en) * 1992-11-09 1994-05-27 Kayaba Ind Co Ltd Gear pump
JP2006022948A (en) * 2004-06-07 2006-01-26 Honda Motor Co Ltd Fastening structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06147133A (en) * 1992-11-09 1994-05-27 Kayaba Ind Co Ltd Gear pump
JP2006022948A (en) * 2004-06-07 2006-01-26 Honda Motor Co Ltd Fastening structure

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KR20100083157A (en) 2010-07-21

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