JP2003065215A - Piston pump motor - Google Patents

Piston pump motor

Info

Publication number
JP2003065215A
JP2003065215A JP2001252164A JP2001252164A JP2003065215A JP 2003065215 A JP2003065215 A JP 2003065215A JP 2001252164 A JP2001252164 A JP 2001252164A JP 2001252164 A JP2001252164 A JP 2001252164A JP 2003065215 A JP2003065215 A JP 2003065215A
Authority
JP
Japan
Prior art keywords
cylinder block
piston
pores
valve plate
piston 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.)
Granted
Application number
JP2001252164A
Other languages
Japanese (ja)
Other versions
JP2003065215A5 (en
JP4657520B2 (en
Inventor
Satoru Matsumoto
哲 松本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shibaura Machine Co Ltd
Original Assignee
Toshiba Machine Co Ltd
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 Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
Priority to JP2001252164A priority Critical patent/JP4657520B2/en
Publication of JP2003065215A publication Critical patent/JP2003065215A/en
Publication of JP2003065215A5 publication Critical patent/JP2003065215A5/ja
Application granted granted Critical
Publication of JP4657520B2 publication Critical patent/JP4657520B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Details Of Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a piston pump motor having a confinement preventive groove capable of reducing vibration and noise caused by this vibration in a rotational area of a very wide range of a pump of the piston pump motor. SOLUTION: This piston pump motor is provided with an autorotating cylinder block 16, a plurality of piston holes arranged in this cylinder block 16, a piston 18 fitted and inserted in these respective piston holes, a valve plate 24 slidingly contacting with the cylinder block 16, and having respective suction and delivery ports, a pressure oil introducing groove 8 extended toward the other port from one end on the side for increasing the opening area to one port of the respective piston holes according to rotation of the cylinder block 16 to the reverse side of a surface for slidingly contacting with the cylinder block 16 of the valve plate 24, and a plurality of pores 6 almost vertically arranged to the surface for slidingly contacting with the cylinder block 16 of the valve plate from this pressure oil introducing groove 8. The plurality of pores 6 are constituted so as to increase the number in the rotational direction of the cylinder block 16.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、建設機械等に用いられ
るピストンポンプ・モータに係り、広範囲な回転領域で
振動及びこれに伴う騒音を低減する閉じ込み防止溝を備
えたピストンポンプモータに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston pump / motor used in construction machinery and the like, and more particularly to a piston pump / motor provided with a lock-in prevention groove for reducing vibration and noise associated therewith in a wide rotation range.

【0002】[0002]

【従来の技術】従来、建設機械等に用いられるピストン
ポンプ・モータの一例を図4、図5に示す。このポンプ
・モータは、駆動軸12にスプライン結合されかつこの
駆動軸12の回りに駆動軸と平行に複数のピストン室1
4が形成されたシリンダブロック16と、前記ピストン
室14に液密的で摺動自在に嵌挿されたピストン18の
行程を規制する斜板20と、この斜板20に取付けられ
たハウジング26およびカバー22に固定されかつ前記
シリンダブロック16と対向して接するバルブプレート
24とから構成されている。シリンダブロック16は、
このシリンダブロック16と駆動軸12との間に備えつ
けられたばね28によりバルブプレート24に押し当て
られて前記駆動軸12にて回転駆動される。このシリン
ダブロック16の回転によりピストン18は、駆動軸1
2を中心として公転しながら斜板20の傾斜角αで規制
された行程を往復運動し、バルブプレート24の流体吸
込用の吸込ポート2と流体吐出用の吐出ポート4とを介
してポンプ作用を行う。
2. Description of the Related Art Conventionally, an example of a piston pump / motor used in a construction machine or the like is shown in FIGS. The pump / motor is splined to a drive shaft 12 and has a plurality of piston chambers 1 about the drive shaft 12 parallel to the drive shaft.
4, a swash plate 20 that regulates the stroke of the piston 18 that is fluid-tightly and slidably fitted in the piston chamber 14, a housing 26 attached to the swash plate 20, The valve plate 24 is fixed to the cover 22 and faces the cylinder block 16 to come into contact therewith. The cylinder block 16 is
A spring 28 provided between the cylinder block 16 and the drive shaft 12 presses the valve plate 24 to rotate the drive shaft 12. The rotation of the cylinder block 16 causes the piston 18 to move to the drive shaft 1
While revolving around 2, the swash plate 20 reciprocates in a stroke regulated by the inclination angle α, and a pump action is performed via the fluid suction inlet port 2 and the fluid discharge outlet port 4 of the valve plate 24. To do.

【0003】バルブプレート24は、図5に示すように
シリンダブロック16に対向する面に円弧状の吸込ポー
ト2と吐出ポート4とを備えている。ピストン室14に
つながるピストン穴10は、吸込ポート2と吐出ポート
4とのピッチ円35上にあって、シリンダブロック16
が回転すると、吸込ポート2と吐出ポート4に交互に連
通し、ピストン室14内の圧力は、ピストン18が吸入
行程にあるときにほぼ吸込ポート2の圧力と一致するよ
うになる。ピストン18が吸入行程を終えて吐出行程に
移ろうとするとき、すなわち、ピストン穴10が吸込ポ
ート2を出て吐出ポート4に達するまでは、ピストン穴
10は吸込ポート2および吐出ポート4のいずれとも遮
断された状態にあるので、ピストン室14の圧力がほぼ
吸込ポート2の圧力からほぼ吐出ポート4の圧力に移行
する行程、いわゆる昇圧行程にある。一方、ピストン穴
10が吐出ポート4を出て吸込ポート2に達するまで、
すなわちピストン18が吐出行程から吸入行程に移行す
るときのピストン穴10は、降圧行程にある。
As shown in FIG. 5, the valve plate 24 is provided with an arc-shaped suction port 2 and discharge port 4 on the surface facing the cylinder block 16. The piston hole 10 connected to the piston chamber 14 is on the pitch circle 35 between the suction port 2 and the discharge port 4, and the cylinder block 16
When is rotated, the suction port 2 and the discharge port 4 are alternately communicated with each other, and the pressure in the piston chamber 14 becomes substantially equal to the pressure in the suction port 2 when the piston 18 is in the suction stroke. When the piston 18 finishes the suction stroke and tries to move to the discharge stroke, that is, until the piston hole 10 exits the suction port 2 and reaches the discharge port 4, the piston hole 10 remains in both the suction port 2 and the discharge port 4. Since it is in the shut-off state, there is a so-called step-up process in which the pressure in the piston chamber 14 shifts from the pressure in the suction port 2 to the pressure in the discharge port 4. On the other hand, until the piston hole 10 exits the discharge port 4 and reaches the suction port 2,
That is, the piston hole 10 when the piston 18 shifts from the discharge stroke to the suction stroke is in the step-down stroke.

【0004】この昇圧行程において、ピストン穴10が
吐出ポート4に連通する瞬間にピストン室14の圧力が
急激に上昇し、降圧行程では、ピストン穴10が吸込ポ
ート2に連通する瞬間にピストン室14の圧力が急激に
下降し、この昇降圧の行程における瞬間的な圧力変化が
シリンダブロック16の回転に同調した周期的な衝撃力
を発生させ、ピストンポンプ・モータの騒音、振動発生
の要因となっていた。
During this boosting stroke, the pressure in the piston chamber 14 rises sharply at the moment when the piston hole 10 communicates with the discharge port 4, and during the pressure reducing stroke, the piston chamber 14 at the moment when the piston hole 10 communicates with the suction port 2. The pressure suddenly drops, and the instantaneous pressure change in the step-up / down of the pressure causes a periodic impact force synchronized with the rotation of the cylinder block 16, which causes noise and vibration of the piston pump / motor. Was there.

【0005】従来は、ピストンポンプ・モータの騒音、
振動を低減するために図6に示すように、バルブプレー
ト24の吸込ポート2および吐出ポート4に連通する閉
じ込み防止溝シリンダブロック16との摺動面側に設け
ている。図6の(a1)はv溝34を設けた例であり、
(a2)は(a1)のB−B断面図である。(b1)は
v溝34とキリ穴36を組合わせた例であり、(b2)
は(b1)のB−B断面図である。(c1)は、先行小
径穴と後行大径穴とを組合わせを設けた例であり、(c
2)は(c1)のB−B断面図である。(d1)は複数
のv溝34を設けた例であり、(d2)は(d1)のB
−B断面図である。(e1)は吐出ポート4からエンド
ミル加工で平底溝44を設けた例であり、(e2)は
(e1)のB−B断面図である。この内(b)、(c)
は先行小径穴36とv溝34又はキリ穴38を組合わせ
たものである。
Conventionally, noise of a piston pump / motor,
In order to reduce vibration, as shown in FIG. 6, the valve plate 24 is provided on the sliding surface side with the lock-in prevention groove cylinder block 16 communicating with the suction port 2 and the discharge port 4. FIG. 6A1 shows an example in which the v-groove 34 is provided,
(A2) is a BB sectional view of (a1). (B1) is an example in which the v groove 34 and the drill hole 36 are combined, and (b2)
FIG. 7B is a sectional view taken along line BB of (b1). (C1) is an example in which a combination of a leading small diameter hole and a trailing large diameter hole is provided, and (c1)
2) is a BB sectional view of (c1). (D1) is an example in which a plurality of v-grooves 34 are provided, and (d2) is B of (d1).
It is a -B sectional view. (E1) is an example in which a flat bottom groove 44 is provided from the discharge port 4 by end milling, and (e2) is a BB cross-sectional view of (e1). Among these (b), (c)
Is a combination of the preceding small diameter hole 36 and the v groove 34 or the drill hole 38.

【0006】先行小径穴36を除くこれらのキリ穴3
8、v溝34、42、または平底溝44は、先行小径穴
36と比較すると圧油の通路面積が大きいため、ピスト
ン穴10が吐出ポート4に開口する過程でこのピストン
穴10を介して急激な圧油の逆流が生じ、振動や騒音の
抑制効果が低いという問題がある。そこで上記のような
閉じ込み防止溝における急激な圧油の逆流が発生しない
よう予圧縮行程を設けてピストン穴10が吐出ポート4
に開口するまでにピストン穴10の圧力を吐出ポート4
の圧力と同じ程度に高める方法も提案されている。
These drill holes 3 except the preceding small hole 36
8, the v-grooves 34, 42 or the flat-bottom groove 44 have a larger passage area for the pressure oil than the preceding small-diameter hole 36, and therefore the piston hole 10 suddenly passes through the piston hole 10 in the process of opening to the discharge port 4. However, there is a problem that the effect of suppressing the vibration and noise is low due to the backflow of various pressure oils. Therefore, a pre-compression stroke is provided so that the rapid backflow of pressure oil does not occur in the lock-up prevention groove as described above, and the piston hole 10 is set in the discharge port 4
The pressure in the piston hole 10 until the discharge port 4
There is also proposed a method of increasing the pressure to the same level.

【0007】しかし、このような対策を講じても効果が
得られるのは、特定のポンプ回転速度範囲のみであり、
それ以外のポンプ回転速度範囲では良好な効果が得られ
ていない。
However, even if such measures are taken, the effect can be obtained only in the specific pump rotation speed range,
Good effects are not obtained in other pump rotation speed ranges.

【0008】[0008]

【発明が解決しようとする課題】本発明の目的は、ピス
トンポンプ・モータのポンプの非常に広範囲な回転領域
において、振動及びこれに伴う騒音を低減できる閉じ込
み防止溝を有するピストンポンプ・モータを提供するこ
とにある。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a piston pump / motor having an anti-lock groove which can reduce vibration and accompanying noise in a very wide range of rotation of the pump of the piston pump / motor. To provide.

【0009】[0009]

【課題を解決するための手段】前記の課題を解決するた
め、本発明に係るピストンポンプ・モータは、自転する
シリンダブロックと、このシリンダブロックに設けられ
た複数のピストン穴と、これらのピストン穴のそれぞれ
に嵌挿されたピストンと、前記シリンダブロックに摺接
し、吸込み用と吐出用の各ポートを有するバルブプレー
トと、前記バルブプレートの前記シリンダブロックと摺
接する面の裏面側に前記シリンダブロックの回転に従っ
て各ピストン穴の一方のポートへの開口面積が増加する
側の一端から他方のポートへ向かって延設した圧油導入
溝と、この圧油導入溝から前記バルブプレートの前記シ
リンダブロックと摺接する面に対して略垂直に設けた複
数の細孔とを備え、前記複数の細孔は前記シリンダブロ
ックの回転方向に対して数が増加するよう構成したこと
を特徴とする。
In order to solve the above-mentioned problems, a piston pump / motor according to the present invention has a cylinder block which rotates, a plurality of piston holes provided in the cylinder block, and these piston holes. Of the piston fitted in each of the above, a valve plate which is in sliding contact with the cylinder block and has respective ports for suction and discharge, and the cylinder block on the back side of the surface of the valve plate in sliding contact with the cylinder block. A pressure oil introduction groove extending from one end on the side where the opening area of each piston hole to one port increases in accordance with the rotation, toward the other port, and the cylinder block of the valve plate slides from this pressure oil introduction groove. And a plurality of pores provided substantially perpendicular to the contact surface, the plurality of pores in the rotation direction of the cylinder block. Characterized by being configured number increases in.

【0010】細孔の集合形状は略v字形状としてもよ
く、また複数の円弧を組合わせた形状としてもよい。こ
の細孔の長さと直径の比が2.5以上としてもよい。
The aggregate shape of the pores may be substantially v-shaped, or may be a shape in which a plurality of arcs are combined. The ratio of the length to the diameter of the pores may be 2.5 or more.

【0011】[0011]

【実施例】本発明の実施形態を図1乃至図3により説明
するが、図4乃至図6に示す同一部品で同一作用のもの
は、同一符号を付して説明を省略する。図1(a)に示
すようにバルブプレート24のカバー22との取付側面
において、吐出ポート4の昇圧工程の終わりにあたる側
の端部から吸込ポート2へ向けて平底溝の圧油導入溝8
が吐出ポート4と同一円周上に設けられ、この圧油導入
溝8からシリンダ摺動面に対してほぼ垂直に開口する複
数の細孔6が設けられている。複数の細孔6は、矢印で
示されるシリンダブロック16の回転方向に対して吸込
ポート側は数が少なく、吐出ポート4に近づくに従って
数が増加するよう分布されている。また、その集合形状
はV字形状をしている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The same parts as those shown in FIGS. 4 to 6 having the same functions are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 1A, on the side surface of the valve plate 24 where the cover 22 is attached, the pressure oil introduction groove 8 of a flat bottom groove is formed from the end of the discharge port 4 on the side corresponding to the end of the pressurizing process toward the suction port 2.
Are provided on the same circumference as the discharge port 4, and a plurality of fine holes 6 are provided which open from the pressure oil introducing groove 8 substantially perpendicularly to the cylinder sliding surface. The plurality of pores 6 are distributed so that the number thereof is small on the suction port side with respect to the rotation direction of the cylinder block 16 indicated by the arrow, and the number thereof increases as it approaches the discharge port 4. The aggregate shape is V-shaped.

【0012】図3を用いてその動作について述べる。上
記のように構成してシリンダブロック16を回転させた
とき、シリンダブロック16の各々のピストン穴10が
順次吸込ポート2から吐出ポート4へ開口するに際し、
吐出ポート4の圧油が圧油導入溝8及び細孔6を経てピ
ストン穴10に逆流する時間当たりの油量Qは、ハーゲ
ンポアズイユの法則により、dを細孔6の直径[m]、Δ
Pを圧油導入溝8とピストン穴10の圧力差[Pa]、μ
を作動油の粘性系数[Pa・s]、Lが細孔6の長さ[m]
とすると
The operation will be described with reference to FIG. When the cylinder block 16 configured as described above is rotated, when the piston holes 10 of the cylinder block 16 are sequentially opened from the suction port 2 to the discharge port 4,
According to Hagen-Poiseuille's law, d is the diameter [m] of the pore 6, [Δm], Δ is the amount of oil per unit time Q when the pressure oil in the discharge port 4 flows back into the piston hole 10 through the pressure oil introduction groove 8 and the pore 6.
P is the pressure difference [Pa] between the pressure oil introduction groove 8 and the piston hole 10, μ
Is the viscous coefficient [Pa · s] of the hydraulic oil, and L is the length of the pores 6 [m]
And

【0013】[0013]

【数1】Q=πdΔP/128μL[m/s]## EQU1 ## Q = πd 4 ΔP / 128 μL [m 3 / s]

【0014】となるので、細孔6の直径を比較的小さく
設定しておけば、個々の細孔6を経てピストン穴10へ
逆流する作動油の流体エネルギーも小さくなる。しか
も、シリンダの回転に従い逐次ピストン穴10と導通す
る細孔の数が増加するので、従来の単一又は少数の閉じ
込み防止溝しか設けていない場合に比較して、回転数に
係わらず、吸込ポート2から吐出ポート4へ切換える際
のピストン穴10内の圧力は非常にスムースに上昇す
る。この結果、本発明を適用したポンプモータの運転騒
音は確実に低減される。特に細孔6の直径dに対する長
さLの比である(L/d)の値が2.5以上とするとよ
り低減効果が高まる。
Therefore, if the diameter of the pores 6 is set to be relatively small, the fluid energy of the hydraulic oil that flows back to the piston hole 10 through the individual pores 6 also becomes small. Moreover, since the number of pores that are successively connected to the piston hole 10 increases with the rotation of the cylinder, compared with the conventional case where only a single or a small number of lock-in prevention grooves are provided, the suction is performed regardless of the rotation speed. The pressure in the piston hole 10 at the time of switching from the port 2 to the discharge port 4 rises very smoothly. As a result, the operating noise of the pump motor to which the present invention is applied is reliably reduced. In particular, when the value of (L / d), which is the ratio of the length L to the diameter d of the pores 6, is 2.5 or more, the reducing effect is further enhanced.

【0015】さらに、図2に示されるように角度θ(圧
油導入溝8が設けられる範囲。以下“予圧縮角度”とい
う)を比較的大きく設定し、そのθに応じて細孔6数を
徐々に増加させるように構成すれば、シリンダブロック
16の回転に従ってピストン穴10へ向けて開口する細
孔6の数を徐々に増加させることができるためピストン
穴10の圧力が非常にスムースに吐出圧力まで上昇する
ので、本発明を適用したポンプモータの騒音と振動は従
来技術と比較して大幅に低減する。また、細孔6の集合
形状は本図に示すように複数の円弧を組合わせた形状と
することもできる。
Further, as shown in FIG. 2, the angle θ (range in which the pressure oil introduction groove 8 is provided; hereinafter referred to as “precompression angle”) is set relatively large, and the number of pores 6 is set in accordance with the angle θ. If configured so as to gradually increase, the number of pores 6 opening toward the piston hole 10 can be gradually increased as the cylinder block 16 rotates, so that the pressure in the piston hole 10 is very smooth. Therefore, the noise and vibration of the pump motor to which the present invention is applied are significantly reduced as compared with the prior art. Further, the aggregate shape of the pores 6 may be a shape in which a plurality of arcs are combined as shown in this figure.

【0016】以上、本発明の実施例をピストンポンプ・
モータの、吸込工程から吐出工程に至る切換部分につい
て説明したが、これを吐出工程から吸込工程に至る部分
に適用することもできる。
As described above, the embodiment of the present invention is a piston pump
Although the switching part of the motor from the suction process to the discharge process has been described, this may be applied to the part from the discharge process to the suction process.

【0017】[0017]

【発明の効果】本発明によれば、ピストンポンプ・モー
タのバルブプレートのシリンダブロックとの摺動面とそ
の裏面に設けた圧油導入溝との間に、シリンダブロック
の回転方向に対して、数が増加する細孔を設けることに
より、ピストンポンプ・モータの非常に広範囲な回転領
域において、振動及びこれに伴う騒音を低減させ、ポン
プモータの搭載された機械の信頼性の向上と良好な環境
維持を図ることができる。
According to the present invention, between the sliding surface of the valve plate of the piston pump / motor with respect to the cylinder block and the pressure oil introduction groove provided on the rear surface thereof, with respect to the rotation direction of the cylinder block, By increasing the number of pores, the vibration and the accompanying noise are reduced in a very wide range of rotation of the piston pump / motor, improving the reliability of the machine equipped with the pump motor and improving the environment. Can be maintained.

【図面の簡単な説明】[Brief description of drawings]

【図1】本願発明に係るピストンポンプ・モータの閉じ
込み防止溝の実施例の一例であり(a)は正面図、
(b)は(a)のC−C断面図である。
FIG. 1 is an example of an embodiment of a lock-in prevention groove of a piston pump / motor according to the present invention (a) is a front view,
(B) is CC sectional drawing of (a).

【図2】本願発明に係るピストンポンプ・モータの閉じ
込み防止溝のさらに細孔を増加させた実施例の(a)は
正面図であり、(b)は(a)のC−C断面図である。
FIG. 2A is a front view of an embodiment in which the number of pores of the lock-up prevention groove of the piston pump / motor according to the present invention is further increased, and FIG. 2B is a sectional view taken along line CC of FIG. Is.

【図3】本願発明に係るピストンポンプ・モータの閉じ
込み防止溝の実施例における動作時の断面図である。
FIG. 3 is a cross-sectional view of the piston pump / motor according to the present invention during operation in the embodiment of the lock-in prevention groove.

【図4】従来のピストンポンプ・モータの要部断面図で
ある。
FIG. 4 is a sectional view of a main part of a conventional piston pump / motor.

【図5】図4のバルブプレートのA−A断面図である。5 is a cross-sectional view taken along the line AA of the valve plate of FIG.

【図6】従来のピストンポンプ・モータの閉じ込み防止
溝の正面図(添字1)B−B断面図(添字2)である。
FIG. 6 is a front view (subscript 1) BB cross-sectional view (subscript 2) of a confinement prevention groove of a conventional piston pump / motor.

【符号の説明】[Explanation of symbols]

2 吸込ポート 3 中心 4 吐出ポート 5 最後端部 6 細孔 7 最外細孔 8 圧油導入溝 10 ピストン穴 12 駆動軸 14 ピストン室 16 シリンダブロック 18 ピストン 20 斜板 22 カバー 23 ピッチ円 24 バルブプレート 26 ハウジング 28 ばね 30 吸込ポート 32 吐出ポート 36、40 先行小径穴 θ 角度 2 Suction port 3 center 4 discharge ports 5 last end 6 pores 7 Outermost pore 8 Pressure oil introduction groove 10 Piston hole 12 drive shaft 14 Piston chamber 16 cylinder block 18 pistons 20 swash plate 22 cover 23 pitch circles 24 valve plate 26 Housing 28 springs 30 suction port 32 discharge ports 36, 40 Leading small diameter hole θ angle

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3H070 AA01 BB04 BB06 CC01 DD05 DD68 DD69 3H071 AA03 BB01 CC21 CC23 DD32 DD35 3H084 AA08 AA16 AA45 BB01 CC02 CC40 CC54    ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H070 AA01 BB04 BB06 CC01 DD05                       DD68 DD69                 3H071 AA03 BB01 CC21 CC23 DD32                       DD35                 3H084 AA08 AA16 AA45 BB01 CC02                       CC40 CC54

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 自転するシリンダブロックと、このシリ
ンダブロックに設けられた複数のピストン穴と、これら
のピストン穴のそれぞれに嵌挿されたピストンと、前記
シリンダブロックに摺接し、吸込み用と吐出用の各ポー
トを有するバルブプレートと、前記バルブプレートの前
記シリンダブロックと摺接する面の裏面側に前記シリン
ダブロックの回転に従って各ピストン穴の一方のポート
への開口面積が増加する側の一端から他方のポートへ向
かって延設した圧油導入溝と、この圧油導入溝から前記
バルブプレートの前記シリンダブロックと摺接する面に
対して略垂直に設けた複数の細孔とを備え、前記複数の
細孔は前記シリンダブロックの回転方向に対して数が増
加するよう構成したことを特徴とする閉じこみ防止溝を
有するピストンポンプ・モータ。
1. A self-rotating cylinder block, a plurality of piston holes provided in the cylinder block, pistons fitted in the respective piston holes, and sliding contact with the cylinder block for suction and discharge. And a valve plate having each port of the valve plate, and one end of the other side of the side where the opening area of each piston hole to the port increases in accordance with the rotation of the cylinder block on the back side of the surface of the valve plate that slides in contact with the cylinder block. The pressure oil introducing groove extending toward the port, and a plurality of pores provided substantially perpendicular to a surface of the valve plate slidingly contacting the cylinder block from the pressure oil introducing groove are provided. A piston pump having a lock-in prevention groove, characterized in that the number of holes increases in the rotational direction of the cylinder block. Motor.
【請求項2】 前記細孔の集合形状が略V字形状である
ことを特徴とする請求項1記載のピストンポンプ・モー
タ。
2. A piston pump / motor according to claim 1, wherein the aggregate shape of the pores is substantially V-shaped.
【請求項3】 前記細孔の集合形状が複数の円弧を組合
わせた形状であることを特徴とする請求項1記載のピス
トンポンプ・モータ。
3. The piston pump motor according to claim 1, wherein the aggregate shape of the pores is a shape in which a plurality of arcs are combined.
【請求項4】 前記細孔の長さと直径の比が2.5以上
であることを特徴とする請求項1乃至3いずれか1項に
記載のピストンポンプ・モータ。
4. The piston pump motor according to claim 1, wherein the ratio of the length and the diameter of the pores is 2.5 or more.
JP2001252164A 2001-08-22 2001-08-22 Piston pump / motor Expired - Lifetime JP4657520B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001252164A JP4657520B2 (en) 2001-08-22 2001-08-22 Piston pump / motor

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Application Number Priority Date Filing Date Title
JP2001252164A JP4657520B2 (en) 2001-08-22 2001-08-22 Piston pump / motor

Publications (3)

Publication Number Publication Date
JP2003065215A true JP2003065215A (en) 2003-03-05
JP2003065215A5 JP2003065215A5 (en) 2008-08-21
JP4657520B2 JP4657520B2 (en) 2011-03-23

Family

ID=19080683

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1293305C (en) * 2003-11-12 2007-01-03 浙江大学 Bubble evolution proof plunger pump port plate
KR101001571B1 (en) * 2008-12-09 2010-12-17 주식회사 두원전자 Variable displacement swash plate compressor
JP2013253605A (en) * 2012-06-06 2013-12-19 Linde Hydraulics Gmbh & Co Kg Hydrostatic positive displacement machine
CN103486016A (en) * 2013-09-16 2014-01-01 同济大学 Valve plate for low-noise anti-cavitation plunger pump
CN104776018A (en) * 2014-12-26 2015-07-15 浙江工业大学 Dynamic-static pressure lubricating type flow distribution plate
CN108644104A (en) * 2018-05-17 2018-10-12 徐工集团工程机械有限公司 The valve plate and plunger type fluid machinery of plunger type fluid machinery
CN108730087A (en) * 2017-04-24 2018-11-02 卡特彼勒公司 Liquid pump for inhibiting cavitation
CN110985369A (en) * 2018-10-03 2020-04-10 株式会社堀内机械 Valve plate and hydraulic rotating device
CN114382690A (en) * 2022-01-18 2022-04-22 中铁工程装备集团有限公司 Plunger pump valve plate

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51129905A (en) * 1975-04-24 1976-11-11 Lucas Industries Ltd Hydraulic rotary machines
JPS57171086A (en) * 1981-04-13 1982-10-21 Kawasaki Heavy Ind Ltd Piston pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51129905A (en) * 1975-04-24 1976-11-11 Lucas Industries Ltd Hydraulic rotary machines
JPS57171086A (en) * 1981-04-13 1982-10-21 Kawasaki Heavy Ind Ltd Piston pump

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1293305C (en) * 2003-11-12 2007-01-03 浙江大学 Bubble evolution proof plunger pump port plate
KR101001571B1 (en) * 2008-12-09 2010-12-17 주식회사 두원전자 Variable displacement swash plate compressor
US10024158B2 (en) 2012-06-06 2018-07-17 Linde Hydraulics Gmbh & Co. Kg Hydrostatic positive displacement machine
CN103470465A (en) * 2012-06-06 2013-12-25 林德液压两合公司 Hydrostatic extruder
JP2013253605A (en) * 2012-06-06 2013-12-19 Linde Hydraulics Gmbh & Co Kg Hydrostatic positive displacement machine
CN103486016A (en) * 2013-09-16 2014-01-01 同济大学 Valve plate for low-noise anti-cavitation plunger pump
CN104776018A (en) * 2014-12-26 2015-07-15 浙江工业大学 Dynamic-static pressure lubricating type flow distribution plate
CN108730087A (en) * 2017-04-24 2018-11-02 卡特彼勒公司 Liquid pump for inhibiting cavitation
CN108730087B (en) * 2017-04-24 2022-05-27 卡特彼勒公司 Liquid pump for inhibiting cavitation
CN108644104A (en) * 2018-05-17 2018-10-12 徐工集团工程机械有限公司 The valve plate and plunger type fluid machinery of plunger type fluid machinery
CN108644104B (en) * 2018-05-17 2023-12-08 江苏徐工工程机械研究院有限公司 Valve plate of plunger type fluid machine and plunger type fluid machine
CN110985369A (en) * 2018-10-03 2020-04-10 株式会社堀内机械 Valve plate and hydraulic rotating device
JP2020076401A (en) * 2018-10-03 2020-05-21 株式会社堀内機械 Valve plate and liquid pressure rotating machine
CN114382690A (en) * 2022-01-18 2022-04-22 中铁工程装备集团有限公司 Plunger pump valve plate
CN114382690B (en) * 2022-01-18 2024-05-24 中铁工程装备集团有限公司 Plunger pump valve plate

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