JP2794918B2 - Gear pump - Google Patents
Gear pumpInfo
- Publication number
- JP2794918B2 JP2794918B2 JP2231780A JP23178090A JP2794918B2 JP 2794918 B2 JP2794918 B2 JP 2794918B2 JP 2231780 A JP2231780 A JP 2231780A JP 23178090 A JP23178090 A JP 23178090A JP 2794918 B2 JP2794918 B2 JP 2794918B2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- bearing case
- side plate
- pressure region
- gear pump
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Landscapes
- Rotary Pumps (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、建設機械、工作機械、農業機械産業車輌等
に使用される歯車ポンプの構造に関する。Description: TECHNICAL FIELD The present invention relates to the structure of a gear pump used for construction machines, machine tools, agricultural machinery industrial vehicles, and the like.
［従来技術］ 歯車ポンプは、互いに噛合する一対の歯車をボディ内
に収納し、駆動側の歯車を強制回転させることにより、
低圧ポートから吸入した液体を高圧ポートから吐出する
ポンプである。前記一対の歯車の軸は、該歯車の両側に
設けた軸受ケースによって支承される。[Prior Art] A gear pump stores a pair of gears meshing with each other in a body, and forcibly rotates a drive-side gear.
This is a pump that discharges the liquid sucked from the low pressure port from the high pressure port. The shafts of the pair of gears are supported by bearing cases provided on both sides of the gears.
従来広く知られている歯車ポンプでは、歯車の側面と
軸受ケースの端面とが直接摺接するもので、側面洩れに
属する軸受ケース部からの洩れを防止するためのシール
材が、ボディの両側開口部を覆うカバー（フロントカバ
ーとリヤーカバー）と軸受ケースとの間で、かつカバー
側に設けられていた。Conventionally, in a widely known gear pump, the side surfaces of the gear and the end surface of the bearing case are in direct sliding contact with each other, and seal materials for preventing leakage from the bearing case portion, which belongs to side leakage, are provided on both side openings of the body. Between the cover (front cover and rear cover) and the bearing case, and on the cover side.
［発明が解決しようとする課題］ しかしながら、この種の歯車ポンプでは、作動中に軸
受ケースもラジアル荷重を受けるので、歯車の軸方向に
移動しにくく、軸受ケースが歯車端面に密着しないこと
による側面漏れが生じていた。[Problems to be Solved by the Invention] However, in this type of gear pump, since the bearing case also receives a radial load during operation, it is difficult to move in the axial direction of the gear, and the side face due to the bearing case not being in close contact with the gear end face. There was a leak.
このような側面漏れを防ぐため、歯車と軸受けケース
との間に軸方向に移動可能な側板を介装した歯車ポンプ
が使用されているが、このポンプは、軸受ケースと側板
との間で漏れが発生するという問題があった。このた
め、歯車に接触する側板の表面部に溝を作り、この溝に
シール材を配置することが考えられるが、このようにす
ると、側板の肉厚を大きくしなければならないので、そ
の分だけ軸受ケースが外側に配置されることになり、歯
車軸の支点間隔が長くなる結果、強度的に問題が生じり
おそれがあった。To prevent such side leakage, a gear pump in which an axially movable side plate is interposed between the gear and the bearing case is used, but this pump has a leak between the bearing case and the side plate. There was a problem that occurs. For this reason, it is conceivable to make a groove on the surface of the side plate that contacts the gear and place a sealing material in this groove.However, in this case, the thickness of the side plate must be increased, Since the bearing case is disposed on the outside and the interval between the fulcrum points of the gear shaft is increased, there is a possibility that a problem may occur in strength.
［課題を解決するための手段］ 本発明は上記課題を解決するために次のような構成を
採用した。[Means for Solving the Problems] The present invention employs the following configuration in order to solve the above problems.
すなわち、第１の発明にかかる歯車ポンプは、互いに
噛合する一対の歯車を内蔵するボデイの両端面にカバー
をそれぞれ取り付け、該カバーと前記歯車の側面との間
に、該歯車の軸を支承する軸受ケースを設けてなる歯車
ポンプにおいて、前記軸受ケースと歯車側面との間に側
板を介装し、前記軸受ケースとカバーとの間に歯車の軸
の外周面に沿うように配置されて高圧域と低圧域とを区
画する部分と、前記軸受ケースと側板との間に歯車の軸
の外周面に沿うように配置されて高圧域と低圧域とを区
画する部分と、これら両部分をその端部で互いに連結す
る部分とで構成される一体型の高低圧区画シールを設け
たことを特徴としている。That is, in the gear pump according to the first invention, covers are attached to both end surfaces of a body containing a pair of gears meshing with each other, and a shaft of the gear is supported between the cover and a side surface of the gear. In a gear pump provided with a bearing case, a side plate is interposed between the bearing case and a gear side surface, and disposed along the outer peripheral surface of a gear shaft between the bearing case and the cover, and a high pressure region is provided. A low pressure region, a portion disposed between the bearing case and the side plate along the outer peripheral surface of the shaft of the gear to partition the high pressure region and the low pressure region, And an integrated high / low pressure section seal composed of portions that are connected to each other at the portions.
また、第２の発明にかかる歯車ポンプは、互いに噛合
する一対の歯車と、該歯車の両側面に摺接する可動形側
板と、該側板の反歯車側にあって両歯車の軸を支承する
軸受ケースとをボデイ内に収容し、該ボデイの両端面に
それぞれカバーを設けてなる歯車ポンプにおいて、前記
側板に対向する軸受ケースの表面部に溝を形成し、高圧
域と低圧域とを区画する高低圧区画シールをこの溝に嵌
め込んで設けたことを特徴としている。A gear pump according to a second aspect of the present invention includes a pair of gears meshing with each other, a movable side plate slidably in contact with both side surfaces of the gear, and a bearing on the opposite side of the side plate to support the shafts of the two gears. In a gear pump in which a case is accommodated in a body and covers are provided on both end surfaces of the body, a groove is formed in a surface portion of a bearing case opposed to the side plate to partition a high pressure region and a low pressure region. It is characterized in that a high / low pressure section seal is provided by fitting into this groove.
［作用］ 第１の発明では、軸受ケースの側板、ボディ、カバー
との三方向での接触面において、これらの接触面をシー
ルする高低圧区画シールが一体的に設けられるので、完
全なシールが施される。しかも、区画シールの側板側の
高圧区画面積がカバー側の高圧区画面積と等しいか大き
くなるよう形成しておけば、側板が歯車に押し付けられ
過ぎることなく、常に軸受ケースをカバー側に押し付け
ることができる。[Operation] In the first invention, since the high and low pressure section seals for sealing the contact surfaces of the bearing case in three directions with the side plate, the body, and the cover are provided integrally, the complete seal is achieved. Will be applied. Moreover, if the high-pressure partition area on the side plate side of the partition seal is formed to be equal to or larger than the high-pressure partition area on the cover side, the side plate can be constantly pressed against the cover without being pressed too much against the gear. it can.
また、第２の発明では、側板に対向する軸受ケースの
表面部に溝を形成し、この溝に高低圧区画シールを嵌め
込んで設けたので、側板の肉厚を薄くすることができ、
歯車の支点間隔を短くして高強度を得ることができると
ともに、効果的なシール効果が得られる。Further, in the second invention, a groove is formed in the surface portion of the bearing case facing the side plate, and the high and low pressure section seal is fitted in the groove, so that the thickness of the side plate can be reduced.
High strength can be obtained by shortening the fulcrum spacing of the gears, and an effective sealing effect can be obtained.
［実施例］ 第１図は本発明の実施例である歯車ポンプの構成を示
す断面図で、歯車ポンプ１は図示しない原動機によって
駆動される駆動歯車２と、該駆動歯車に噛合する従動歯
車３とを備え、これら両歯車はボディ５のギヤ室６内に
収容されている。これら駆動歯車２および従動歯車３の
両側面には側板8,9が介装され、歯車の軸はボディ５内
に収容した軸受ケース10,11により、ブッシュ12を介し
て支承されている。Embodiment FIG. 1 is a sectional view showing a configuration of a gear pump according to an embodiment of the present invention. A gear pump 1 includes a driving gear 2 driven by a motor (not shown) and a driven gear 3 meshed with the driving gear. These two gears are accommodated in a gear chamber 6 of the body 5. Side plates 8 and 9 are interposed on both side surfaces of the drive gear 2 and the driven gear 3, and the shafts of the gears are supported via bushes 12 by bearing cases 10 and 11 housed in a body 5.
ギヤ室６は、互いに噛合する駆動歯車２および従動歯
車３の外径に沿う中央部がくびれた形状に形成されてお
り、そのくびれた部分に高圧側の吐出口と低圧側の吸込
口とが設けられている。The gear chamber 6 is formed such that a central portion along the outer diameter of the driving gear 2 and the driven gear 3 meshing with each other is formed in a constricted shape, and a discharge port on the high pressure side and a suction port on the low pressure side are formed in the constricted portion. Is provided.
軸受ケース10,11によって支承される歯車2,3を収容し
たボディ５の後端部には、リヤーカバー13がボルトによ
って取り付けられている。また、ボディ５の前端部に
は、駆動歯車２の駆動軸15を外方に突出させる軸受穴を
穿設したフロントカバー16がボルトによって取り付けら
れている。駆動軸15は、フロントカバー16の開口部18に
嵌装されたオイルシール19によってシールされるととも
に、原動機の出力軸に連結する。A rear cover 13 is attached to the rear end of the body 5 containing the gears 2 and 3 supported by the bearing cases 10 and 11 by bolts. Further, a front cover 16 having a bearing hole for projecting the drive shaft 15 of the drive gear 2 outward is attached to the front end of the body 5 by bolts. The drive shaft 15 is sealed by an oil seal 19 fitted in the opening 18 of the front cover 16, and is connected to the output shaft of the motor.
上記した歯車の軸を支承する軸受ケース10,11の側板
8,9、フロントカバー16、リヤーカバー13と接触する外
周面には、第２図に示すような二重逆３の字形の一体に
形成された高低圧区画シール21および対称形のシール22
が装着される溝部が刻設されている。第３図は、第１図
において矢視Ｄ方向からみた区画シール21が軸受ケース
10に装着された状態を示す図で、吐出側が高圧領域、吸
込側が低圧領域となる。Side plates of bearing cases 10 and 11 that support the gear shafts described above
8, 9 and the front cover 16 and the rear cover 13 are provided on the outer peripheral surface with a double-inverted three-shaped high and low pressure section seal 21 and a symmetrical seal 22 as shown in FIG.
A groove for mounting is provided. FIG. 3 shows that the partition seal 21 viewed from the direction of arrow D in FIG.
10 is a view showing a state where the apparatus is mounted on 10, where the discharge side is a high pressure area and the suction side is a low pressure area.
区画シール21の側板８側に接する領域ACBは、側板８
が歯車側高圧領域とバランスするような形状、面積に形
成される。また、領域ACBはフロントケース16側に接す
る領域Ａ′Ｃ′Ｂ′に比べ、逆３の字形状のくびれ部分
が大きく、曲線部分が先行し、第３図に示すように（実
線がACB領域、点線がＡ′Ｃ′Ｂ′領域）領域Ａ′Ｃ′
Ｂ′の吐出側面積Ｓ′と領域ACBの吐出側面積ＳがＳ′
≦Ｓとなるように形成されている。The area ACB in contact with the side plate 8 of the partition seal 21 is
Are formed in a shape and area that balance with the gear-side high-pressure region. Also, in the area ACB, as compared with the area A'C'B 'in contact with the front case 16 side, the constricted portion of the inverted three-letter shape is larger, and the curved portion precedes, as shown in FIG. , The dotted line is the A'C'B 'area) area A'C'
The discharge side area S ′ of B ′ and the discharge side area S of the area ACB are S ′.
≦ S.
区画シールをこのように形成することにより、軸受ケ
ース10,11と側板8,9の接触面のみならず、軸受ケース1
0,11の軸方向におけるボディ５との接触面および軸受ケ
ース10,11とリヤーカバー13、フロントカバー16との接
触面もシールすることができる。従って、第３図の実線
矢印で示す軸受ケースとボディ接触面での吐出側から吸
込側への洩れを防止するとともに、軸受ケースとカバー
接触面からの洩れも防止することができる。また、領域
Ａ′Ｃ′Ｂ′の吐出側面積Ｓ′と領域ACBの吐出面積Ｓ
との関係がＳ′≦Ｓとなるように形成されているので、
側板８が歯車に押し付けられ過ぎることなく常に軸受ケ
ース10をフロントカバー16側へ押し付けることができ
る、区画シール22も21と対称形をしており、軸受ケース
11と側板９、リヤーカバー13、ボディ５との接触面をシ
ールするとともに、側板９を歯車に押し付け過ぎること
なく軸受ケース11をリヤーカバー13側へ押し付けること
ができる。By forming the partition seals in this way, not only the contact surfaces between the bearing cases 10, 11 and the side plates 8, 9 but also the bearing case 1
The contact surfaces with the body 5 in the axial directions 0 and 11 and the contact surfaces between the bearing cases 10 and 11 and the rear cover 13 and the front cover 16 can also be sealed. Accordingly, it is possible to prevent the leakage from the discharge side to the suction side at the contact surface between the bearing case and the body indicated by the solid arrow in FIG. 3 and also prevent the leakage from the contact surface between the bearing case and the cover. Further, the discharge side area S 'of the region A'C'B' and the discharge area S
Is formed such that S ′ ≦ S,
The partition seal 22 is also symmetrical to 21 so that the side plate 8 can always press the bearing case 10 against the front cover 16 without being pressed too much against the gear.
The contact surface between the side plate 9, the side plate 9, the rear cover 13, and the body 5 is sealed, and the bearing case 11 can be pressed against the rear cover 13 without excessively pressing the side plate 9 against the gear.
さらに、上記実施例のポンプにあっては、軸受ケース
の表面粗さ、直角度といった加工精度が低くとも軸受ケ
ースのボディに沿う円周方向並びにカバーに沿う面から
の油洩れを有効に防止することができ、ポンプ内の容積
効率を高めることができる。すなわち、軸受ケースとカ
バーとのシール面Ｅが金属同士の面シールのためシール
が不充分であること、軸受ケースの加工精度が低い場合
に、第５図に示すように、軸受ケースのカバー接触面と
ボディ接触面との間に隙間が生じること、また、第６図
に示すように軸受ケースとボディとのシール面Ｇも金属
同士の面シールのためシールが不充分であること、さら
に軸受ケースのボディ接触面の曲面半径Ｒがボディの曲
面半径Ｒ′と一致しないため（通常Ｒ＜Ｒ′）軸受ケー
スとボディの接触は軸方向の線接触となり隙間部Ｈが生
じること等により、油洩れが生じて容積効率が悪くなる
が、本発明では、このような油漏れが生じにくい。Furthermore, in the pump of the above embodiment, oil leakage from the circumferential direction along the body of the bearing case and the surface along the cover is effectively prevented even if the processing accuracy such as the surface roughness and the squareness of the bearing case is low. And the volumetric efficiency in the pump can be increased. In other words, if the sealing surface E between the bearing case and the cover is a metal-to-metal surface seal and the sealing is insufficient, and if the processing accuracy of the bearing case is low, as shown in FIG. A gap is formed between the bearing surface and the body contact surface. Also, as shown in FIG. 6, the sealing surface G between the bearing case and the body is not sufficiently sealed due to the surface sealing between metals. Since the curved surface radius R of the body contact surface of the case does not coincide with the curved surface radius R 'of the body (usually R <R'), the contact between the bearing case and the body becomes a line contact in the axial direction, and a gap H is generated. Although the volume efficiency is deteriorated due to the leakage, such oil leakage hardly occurs in the present invention.
なお、区画シールの形状は実施例のものに限定され
ず、軸受ケースと側板、ボディ、カバーとの接触面を考
慮して構成すればよい。The shape of the partition seal is not limited to that of the embodiment, and may be configured in consideration of the contact surfaces between the bearing case and the side plates, the body, and the cover.
第４図は上記と異なる実施例をあらわすもので、この
歯車ポンプは、ボディ30内のギヤ室31に駆動歯車32とこ
れに噛合する従動歯車33が収容され、両歯車の側面には
側板35,36が設けられるとともに、歯車の軸をボディ内
の軸受穴に設けた軸受ケース37,38で支承し、ボディの
後端側にはリヤーカバー40、ボディの前端側には駆動歯
車の一方の突出軸が支承される軸受穴を有するフロント
カバー41を設けて構成されている。FIG. 4 shows an embodiment different from the above. In this gear pump, a drive gear 32 and a driven gear 33 meshing with the drive gear 32 are housed in a gear chamber 31 in a body 30, and side plates 35 are provided on the side surfaces of both gears. , 36 are provided, and the shaft of the gear is supported by bearing cases 37, 38 provided in bearing holes in the body, a rear cover 40 is provided at the rear end of the body, and one of the drive gears is provided at the front end of the body. A front cover 41 having a bearing hole in which a protruding shaft is supported is provided.
この歯車ポンプの内部洩れは、歯先、側面、歯面の３
個所で生じうるが、側面洩れに属する軸受ケース部から
の洩れを防止するために、軸受ケース36,37と側板35,36
との間に弾性シール材43,44が設けられている。これら
シール材43,44は、軸受けケース37,38側に設けた溝に嵌
め込んで設けられている。このため、側板の肉厚を十分
小さくすることができ、歯車軸の支点間隔を短くして、
高強度を得ることができるのである。The internal leakage of this gear pump is caused by
In order to prevent leakage from the bearing case part, which may occur at the location, but belongs to side leakage, the bearing cases 36, 37 and the side plates 35, 36
The elastic sealing members 43 and 44 are provided between the two. These seal members 43 and 44 are provided by fitting into grooves provided on the bearing cases 37 and 38 side. For this reason, the thickness of the side plate can be made sufficiently small, the fulcrum interval of the gear shaft is shortened,
High strength can be obtained.
［発明の効果］ 上記説明から明らかなように本発明にかかる歯車ポン
プによれば、軸受ケース等の加工精度が低くとも歯車ポ
ンプの内部洩れを有効に防止することができるととも
に、容積効率を向上することができるようになった。[Effects of the Invention] As is clear from the above description, according to the gear pump according to the present invention, it is possible to effectively prevent internal leakage of the gear pump even if machining accuracy of the bearing case and the like is low, and to improve the volumetric efficiency. You can now.
第１図は本発明の実施例の構成を示す断面図、第２図は
区画シールの形状を示す斜視図、第３図は第１図におけ
るＤ矢視図、第４図は異なる実施例を示す断面図、第５
図および第６図は従来例の問題点を説明する図である。 ２……駆動歯車、３……従動歯車、５……ボディ、8,9
……側板 10,11……軸受ケース、13……リヤーカバー、16……フ
ロントカバー 21,22……区画シールFIG. 1 is a cross-sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing the shape of a partition seal, FIG. 3 is a view taken in the direction of arrow D in FIG. 1, and FIG. Sectional view, fifth
FIG. 6 and FIG. 6 are diagrams for explaining the problems of the conventional example. 2 ... drive gear, 3 ... driven gear, 5 ... body, 8, 9
… Side plates 10,11… Bearing case, 13… Rear cover, 16… Front cover 21,22 …… Segment seal
Claims (2)
イの両端面にカバーをそれぞれ取り付け、該カバーと前
記歯車の側面との間に、該歯車の軸を支承する軸受ケー
スを設けてなる歯車ポンプにおいて、前記軸受ケースと
歯車側面との間に側板を介装し、前記軸受ケースとカバ
ーとの間に歯車の軸の外周面に沿うように配置されて高
圧域と低圧域とを区画する部分と、前記軸受ケースと側
板との間に歯車の軸の外周面に沿うように配置されて高
圧域と低圧域とを区画する部分と、これら両部分をその
端部で互いに連結する部分とで構成される一体型の高低
圧区画シールを設けたことを特徴とする歯車ポンプ。1. A gear comprising: a body having a pair of gears meshing with each other; a cover attached to each end face of the body; and a bearing case for supporting a shaft of the gear between the cover and a side surface of the gear. In the pump, a side plate is interposed between the bearing case and the side surface of the gear, and disposed between the bearing case and the cover along the outer peripheral surface of the shaft of the gear to partition a high-pressure region and a low-pressure region. A portion disposed between the bearing case and the side plate along the outer peripheral surface of the shaft of the gear to partition a high-pressure region and a low-pressure region, and a portion connecting these two portions to each other at their ends. A gear pump provided with an integral high / low pressure section seal composed of:
側面に摺接する可動形側板と、該側板の反歯車側にあっ
て両歯車の軸を支承する軸受ケースとをボデイ内に収容
し、該ボデイの両端面にそれぞれカバーを設けてなる歯
車ポンプにおいて、前記側板に対向する軸受ケースの表
面部に溝を形成し、高圧域と低圧域とを区画する高低圧
区画シールをこの溝に嵌め込んで設けたことを特徴とす
る歯車ポンプ。2. A body containing a pair of gears meshing with each other, a movable side plate slidably in contact with both side surfaces of the gears, and a bearing case on the opposite gear side of the side plate and supporting the shafts of the two gears. In the gear pump in which covers are provided on both end surfaces of the body, a groove is formed in a surface portion of the bearing case facing the side plate, and a high / low pressure partition seal for partitioning a high pressure region and a low pressure region is formed by the groove. A gear pump characterized in that the gear pump is provided by being fitted into the gear pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2231780A JP2794918B2 (en) | 1990-08-31 | 1990-08-31 | Gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2231780A JP2794918B2 (en) | 1990-08-31 | 1990-08-31 | Gear pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04112981A JPH04112981A (en) | 1992-04-14 |
| JP2794918B2 true JP2794918B2 (en) | 1998-09-10 |
Family
ID=16928919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2231780A Expired - Lifetime JP2794918B2 (en) | 1990-08-31 | 1990-08-31 | Gear pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2794918B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003294889A1 (en) | 2002-12-19 | 2004-07-14 | Haldex Hydraulics Gmbh | Gear-type machine comprising lateral axial plates |
| CN106837849B (en) * | 2017-01-16 | 2018-01-30 | 湖南航翔燃气轮机有限公司 | Centrifugal blower high speed rotor structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2443600A1 (en) * | 1974-09-12 | 1976-03-25 | Bosch Gmbh Robert | GEAR MACHINE |
| JPS59165984U (en) * | 1983-04-25 | 1984-11-07 | 株式会社ナブコ | Gear pump or motor side seal mechanism |
-
1990
- 1990-08-31 JP JP2231780A patent/JP2794918B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04112981A (en) | 1992-04-14 |
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