JP2012112284A - Multiple piston pump - Google Patents
Multiple piston pump Download PDFInfo
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- JP2012112284A JP2012112284A JP2010260963A JP2010260963A JP2012112284A JP 2012112284 A JP2012112284 A JP 2012112284A JP 2010260963 A JP2010260963 A JP 2010260963A JP 2010260963 A JP2010260963 A JP 2010260963A JP 2012112284 A JP2012112284 A JP 2012112284A
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Abstract
Description
本発明は、多連ピストンポンプ連結部の耐久性向上に関する。 The present invention relates to an improvement in durability of a multiple piston pump connecting portion.
従来、一つのポンプ駆動軸により、複数のポンプ、例えばピストンポンプとギヤポンプ等を同時に駆動するようにした多連ピストンポンプが知られている。
図３は従来の斜板式可変吐出量ピストンポンプ（以下、ピストンポンプという）２０の略縦断面図を示し、図４は図３のＩＶ―ＩＶ線の断面図を示す。
図３において、参照符号２１はベアリング２２、２３を介してハウジング２４、カバー２５に取り付けられたシャフトであり、多数のピストン２６を持ったシリンダバレル２７がスプライン２８で結合されている。斜板２９はその裏面（図３で右面）にピストン２６の頭部に取り付けられている球部と結合するシュー３０によって保持されている。
2. Description of the Related Art Conventionally, a multiple piston pump is known in which a plurality of pumps, for example, a piston pump and a gear pump are driven simultaneously by a single pump drive shaft.
FIG. 3 is a schematic longitudinal sectional view of a conventional swash plate type variable discharge amount piston pump (hereinafter referred to as a piston pump) 20, and FIG. 4 is a sectional view taken along line IV-IV in FIG.
In FIG. 3, reference numeral 21 denotes a shaft attached to a housing 24 and a cover 25 via bearings 22 and 23, and a cylinder barrel 27 having a large number of pistons 26 is connected by a spline 28. The swash plate 29 is held on the back surface (right surface in FIG. 3) by a shoe 30 that is coupled to a ball portion attached to the head of the piston 26.
よって、シリンダバレル２７がシャフト２１の駆動により回転すると、シュー３０が斜板２９の裏面を摺動してピストン２６をストロークするよう構成される。
斜板２９は支点３１を中心にして傾転可能に支持されている。前記支点３１は、例えばシャフト２１の軸心に対して略水平方向（紙面に対して垂直方向）に等間隔で２個配置され、前記斜板２９にはピストン２６の反力を受け支点３１の回りに回転する力を受ける。カバー２５の端面（図３で右側面）には、ギヤポンプ３２の駆動軸３３がカップリング３４を介してシャフト２１に連結されている（例えば、特許文献１参照。）。
Therefore, when the cylinder barrel 27 is rotated by driving the shaft 21, the shoe 30 slides on the back surface of the swash plate 29 and strokes the piston 26.
The swash plate 29 is supported so as to be tiltable about a fulcrum 31. For example, two fulcrums 31 are arranged at equal intervals in a substantially horizontal direction (perpendicular to the paper surface) with respect to the axis of the shaft 21, and the swash plate 29 receives the reaction force of the piston 26 to Receives rotating force around. A drive shaft 33 of the gear pump 32 is coupled to the shaft 21 via a coupling 34 on the end surface (right side surface in FIG. 3) of the cover 25 (see, for example, Patent Document 1).
しかしながら、特許文献１においては、ピストンポンプ２０とギヤポンプ３２はそれぞれの軸であるシャフト２１と駆動軸３３がカップリング（連結部）３４にて連結されているが、該連結部３４にエアーが滞留して作動油が循環せず、潤滑不良による摩耗が発生する場合があるので、ギヤポンプ３２が動作不良を起こす要因になっている。
本発明は係る課題を解決するためになされたもので、連結部のエアーを排出し作動油を循環させることで該連結部を潤滑し、耐久性向上させることが可能な多連ピストンポンプを提供することを目的とする。
However, in Patent Document 1, the piston pump 20 and the gear pump 32 have their shafts 21 and drive shafts 33 connected to each other by couplings (connection parts) 34, but air stays in the connection parts 34. Since the hydraulic oil does not circulate and wear due to poor lubrication may occur, the gear pump 32 causes malfunction.
The present invention has been made to solve such problems, and provides a multiple piston pump capable of lubricating the connecting portion by exhausting air from the connecting portion and circulating the hydraulic oil, thereby improving durability. The purpose is to do.
前記の課題を解決するため請求項１記載の発明は、
ハウジング及びカバー内に装着されたべリングにより回転自在に支持されたシャフト、
前記シャフトと共に回転可能に支持されたシリンダバレルの複数個のピストン室に軸方向摺動可能に嵌挿された複数個のピストン、前記ピストンの一端側の前記ピストン室に開口する吸入ポート及び吐出ポートを有するバルブプレート、前記ピストンの他端側頭部及びシューを介して摺接可能な斜板を備えた油圧ポンプと、
前記油圧ポンプのシャフトに連結部を介して連結された駆動軸を有するギヤポンプと、を備えた多連ピストンポンプにおいて、
前記カバーにギヤポンプ吸入ラインと前記連結部とを連通する連通路を設け、作動油が連結部に流れて該連結部にエアーの滞留を防止したことを特徴とする。
In order to solve the above problems, the invention according to claim 1
A shaft rotatably supported by a belling mounted in the housing and cover;
A plurality of pistons slidably inserted in a plurality of piston chambers of a cylinder barrel rotatably supported with the shaft, and a suction port and a discharge port opening in the piston chamber on one end side of the piston A hydraulic pump comprising a valve plate having a swash plate that can be slidably contacted with the other end of the piston and the shoe;
In a multiple piston pump comprising a gear pump having a drive shaft connected to a shaft of the hydraulic pump via a connecting portion,
The cover is provided with a communication path that connects the gear pump suction line and the connecting portion, and hydraulic oil flows into the connecting portion to prevent air from staying in the connecting portion.
本発明は、油圧ポンプのシャフトに連結部を介して連結された駆動軸を有するギヤポンプを備えた多連ピストンポンプにおいて、安価な構造でカバーにギヤポンプ吸入ラインと前記連結部とを連通する連通路を設けることにより、作動油が連結部に流れて該連結部にエアーが滞留することを防止し、油圧ポンプの耐久性能を向上させることができる。 The present invention relates to a multiple piston pump including a gear pump having a drive shaft connected to a shaft of a hydraulic pump via a connecting portion, and a communication path that connects the gear pump suction line and the connecting portion to a cover with an inexpensive structure. By providing this, it is possible to prevent hydraulic oil from flowing into the connecting portion and air from staying in the connecting portion, and to improve the durability performance of the hydraulic pump.
以下、本発明に係る多連ピストンポンプにつき好適の実施の形態を挙げ、添付図面を参照して詳細に説明する。
図１は、本発明の実施の形態に係る多連ピストンポンプ１０の概略構造を示す縦断面図であり、図２は図１のＩＩ−ＩＩ線の断面図を示す。図１及び図２中、図３及び図４の構成要素と同一の構成要素については同一符号を付して詳細な説明を省略する。
Hereinafter, preferred embodiments of a multiple piston pump according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing a schematic structure of a multiple piston pump 10 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1 and 2, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
図１に示すように、多連ピストンポンプ１０には、カバー２５にギヤポンプ吸入ライン１１と（カップリング）連結部３４とを連通する連通路１２を設け、作動油が連結部３４に流れて該連結部３４にエアーが滞留することを防止している。
係る多連ピストンポンプ１０において、該ピストンポンプ１０の駆動と共に、ギヤポンプ３２も協動し、該ギヤポンプ３２がギヤポンプ吸入ライン１１より作動油を吸込む際、多連ピストンポンプ１０の連結部３４に滞留したエアーが作動油と共に、連通路１２より吸い込まれるので、作動油が循環するようになり連結部３４に作動油を積極的に供給するようになり、連結部３４への潤滑により多連ピストンポンプ１０の耐久性能を向上させることができる。
As shown in FIG. 1, the multiple piston pump 10 is provided with a communication passage 12 that connects the gear pump suction line 11 and the (coupling) connecting portion 34 to the cover 25, and hydraulic oil flows to the connecting portion 34 to cause the Air is prevented from staying in the connecting portion 34.
In such a multiple piston pump 10, the gear pump 32 cooperates with the driving of the piston pump 10, and when the gear pump 32 sucks hydraulic oil from the gear pump suction line 11, it stays in the connecting portion 34 of the multiple piston pump 10. Since air is sucked together with the hydraulic oil from the communication passage 12, the hydraulic oil circulates and actively supplies the hydraulic oil to the connecting portion 34, and the multiple piston pump 10 is lubricated to the connecting portion 34. The durability performance can be improved.
１０、２０ 多連ピストンポンプ １１ ギヤポンプ吸入ライン
１２ 連通路 ）
２１ シャフト ２２、２３ ベアリング
２４ ハウジング ２５ カバー
２６ ピストン ２７ シリンダバレル
２９ 斜板 ３０ シュー
３２ ギヤポンプ ３４ カップリング
10, 20 Multiple piston pumps 11 Gear pump suction line 12 Communication path)
21 Shaft 22, 23 Bearing 24 Housing 25 Cover 26 Piston 27 Cylinder barrel 29 Swash plate 30 Shoe 32 Gear pump 34 Coupling
Claims (1)
前記シャフトと共に回転可能に支持されたシリンダバレルの複数個のピストン室に軸方向摺動可能に嵌挿された複数個のピストン、前記ピストンの一端側の前記ピストン室に開口する吸入ポート及び吐出ポートを有するバルブプレート、前記ピストンの他端側頭部及びシューを介して摺接可能な斜板を備えた油圧ポンプと、
前記油圧ポンプのシャフトに連結部を介して連結された駆動軸を有するギヤポンプと、を備えた多連ピストンポンプにおいて、
前記カバーにギヤポンプ吸入ラインと前記連結部とを連通する連通路を設け、作動油が連結部に流れて該連結部にエアーの滞留を防止したことを特徴とする多連ピストンポンプ。 A shaft rotatably supported by a belling mounted in the housing and cover;
A plurality of pistons slidably inserted in a plurality of piston chambers of a cylinder barrel rotatably supported with the shaft, and a suction port and a discharge port opening in the piston chamber on one end side of the piston A hydraulic pump comprising a valve plate having a swash plate that can be slidably contacted with the other end of the piston and the shoe;
In a multiple piston pump comprising a gear pump having a drive shaft connected to a shaft of the hydraulic pump via a connecting portion,
A multi-piston piston pump characterized in that a communication passage for communicating the gear pump suction line and the connecting portion is provided in the cover, and hydraulic oil flows into the connecting portion to prevent air from staying in the connecting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010260963A JP2012112284A (en) | 2010-11-24 | 2010-11-24 | Multiple piston pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010260963A JP2012112284A (en) | 2010-11-24 | 2010-11-24 | Multiple piston pump |
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| Publication Number | Publication Date |
|---|---|
| JP2012112284A true JP2012112284A (en) | 2012-06-14 |
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| JP2010260963A Pending JP2012112284A (en) | 2010-11-24 | 2010-11-24 | Multiple piston pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277279A (en) * | 2013-06-09 | 2013-09-04 | 淮阴工学院 | Pump assisted type valve distributing plunger pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2652231A1 (en) * | 1976-11-16 | 1978-05-24 | Linde Ag | Axial piston pump of swashplate type - includes inclined plate construction and has auxiliary pump made as interior gear pump |
| JPH09184478A (en) * | 1995-12-28 | 1997-07-15 | Uchida Yuatsu Kiki Kogyo Kk | Multiple pump |
| JP2001280262A (en) * | 2000-03-30 | 2001-10-10 | Tokico Ltd | Gear pump |
-
2010
- 2010-11-24 JP JP2010260963A patent/JP2012112284A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2652231A1 (en) * | 1976-11-16 | 1978-05-24 | Linde Ag | Axial piston pump of swashplate type - includes inclined plate construction and has auxiliary pump made as interior gear pump |
| JPH09184478A (en) * | 1995-12-28 | 1997-07-15 | Uchida Yuatsu Kiki Kogyo Kk | Multiple pump |
| JP2001280262A (en) * | 2000-03-30 | 2001-10-10 | Tokico Ltd | Gear pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277279A (en) * | 2013-06-09 | 2013-09-04 | 淮阴工学院 | Pump assisted type valve distributing plunger pump |
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