JPH0599134A - Piston - Google Patents
PistonInfo
- Publication number
- JPH0599134A JPH0599134A JP3260320A JP26032091A JPH0599134A JP H0599134 A JPH0599134 A JP H0599134A JP 3260320 A JP3260320 A JP 3260320A JP 26032091 A JP26032091 A JP 26032091A JP H0599134 A JPH0599134 A JP H0599134A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- sleeve
- space
- connecting base
- pipe
- 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
Links
Landscapes
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ピストンポンプある
いはピストンモータに使用されるピストンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston used in a piston pump or a piston motor.
【０００２】[0002]
【従来の技術】近年、ピストンポンプあるいはピストン
モータに使用されるピストンは、ピストンポンプおよび
ピストンモータの高圧・高速化に伴って、ますます軽量
化が要求されるようになってきている。図２は軽量化が
図られた従来のピストンの１例を示す断面図である。こ
のピストンは、中空構造とすることにより軽量化を図っ
たものであり、ピストンシュー３０が取り付けられる球
状の頭部３１と、この頭部３１に連なる連結基部３２
と、この連結基部３２に連なると共に後端が開口した円
筒状のスリーブ３３とを一体に形成してなり、更に、そ
の中空部３４から上記頭部３１の先端に通じる潤滑用通
路３５を有している。このピストンは軽量であることか
ら高速化には適しているが、後端開口部から中空部３４
に流体が入り込むため、その中空部３４の容積の分だけ
ポンプあるいはモータの容積効率が悪くなるという欠点
がある。2. Description of the Related Art In recent years, the weight of pistons used in piston pumps or piston motors has been required to be lighter as the piston pumps and piston motors operate at higher pressures and higher speeds. FIG. 2 is a cross-sectional view showing an example of a conventional piston whose weight is reduced. This piston has a hollow structure to reduce its weight, and has a spherical head 31 to which the piston shoe 30 is attached, and a connecting base 32 connected to the head 31.
And a cylindrical sleeve 33 continuous with the connection base 32 and having a rear end opened, and further has a lubrication passage 35 communicating from the hollow portion 34 to the tip of the head 31. ing. Since this piston is lightweight, it is suitable for speeding up, but it is possible to use the hollow portion 34 from the rear end opening.
Since the fluid enters the space, there is a disadvantage that the volumetric efficiency of the pump or the motor deteriorates by the volume of the hollow portion 34.
【０００３】そこで、従来、図３に示すように、中空構
造にして軽量化を図ると共に、その中空部に流体が入り
込まないように後端部を閉鎖して容積効率を良くしたピ
ストンが提案されている(特開昭５０−９７９０２号公
報)。このピストンは、一点鎖線６０より左の本体部４
０に右の端部５０を慣性熔接により接合したものであ
る。すなわち、本体部４０を、球状の頭部４１と、この
頭部に連なる連結基部４２と、この連結基部に連なる中
央支柱４３および円筒状のスリーブ４４を有すると共
に、その中央支柱４３の後端と頭部４１の先端に開口す
る潤滑用通路４５と、中央支柱４３とスリーブ４４との
間の環状間隙４６を有するように形成する一方、端部５
０を、端壁５１と、この端壁５１に連なる中央突起５２
および環状突出壁５３を有すると共に、その端壁５１の
後端と中央突起５２の前端に開口する潤滑用通路５４
と、中央突起５２と環状突出壁５３との間の環状間隙５
５を有するように形成し、本体部４０の中央支柱４３に
端部５０の中央突起５２を、本体部４０の円筒状スリー
ブ４４に端部５０の環状突出壁５３をそれぞれ接合した
ものである。上記環状間隙４６に挿入されているワッシ
ャ７０は加工時や慣性熔接時における変形等を防止する
ための補強材である。このように形成されたピストンは
軽量であるため高圧・高速化に適し、かつ、中空部(環
状間隙４６,５５)に流体が入り込まないために容積効率
が良くなる。Therefore, conventionally, as shown in FIG. 3, there has been proposed a piston having a hollow structure for weight reduction and having a rear end portion closed so as to prevent fluid from entering the hollow portion to improve volumetric efficiency. (Japanese Patent Laid-Open No. 50-97902). This piston has a body part 4 on the left side of the one-dot chain line 60.
The right end portion 50 is joined to 0 by inertia welding. That is, the main body portion 40 has a spherical head portion 41, a connecting base portion 42 connected to the head portion, a central support column 43 and a cylindrical sleeve 44 connected to the connecting base portion, and a rear end of the central support column 43. The end portion 5 is formed so as to have a lubricating passage 45 opening at the tip of the head portion 41 and an annular gap 46 between the central support column 43 and the sleeve 44.
0 is an end wall 51 and a central projection 52 that is continuous with the end wall 51.
And a lubricating passage 54 having an annular projecting wall 53 and opening at the rear end of the end wall 51 and the front end of the central protrusion 52.
And the annular gap 5 between the central protrusion 52 and the annular protruding wall 53.
5, the central support column 43 of the main body portion 40 is joined to the central projection 52 of the end portion 50, and the cylindrical sleeve 44 of the main body portion 40 is joined to the annular projecting wall 53 of the end portion 50. The washer 70 inserted in the annular gap 46 is a reinforcing material for preventing deformation and the like during processing and inertia welding. The piston formed in this way is lightweight and suitable for high pressure and high speed, and the volume efficiency is improved because the fluid does not enter the hollow portions (annular gaps 46, 55).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このピ
ストンは、慣性熔接によって熔接接合部ができるため、
剛性が下がり、破壊が生じやすいという問題や、環状間
隙の加工に特殊な専用の工具(刃具や加工機)を必要と
し、加工工数も多くなるという問題がある。そこで、こ
の発明の目的は、熔接接合部がなく、標準的な工具で簡
単に加工でき、しかも、軽量で容積効率のよいピストン
を提供することにある。However, since this piston has a welded joint portion by inertia welding,
There are problems that the rigidity is lowered and breakage is likely to occur, and that a special tool (blade or processing machine) is specially used for processing the annular gap, and the number of processing steps increases. Therefore, an object of the present invention is to provide a piston which has no welded joint, can be easily processed by a standard tool, and is lightweight and has high volume efficiency.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、この発明は、ピストンポンプまたはピストンモータ
に使用されるピストンであって、ピストンシューが取り
付けられる略球状の頭部５と、この頭部５に連なる連結
基部６と、この連結基部６に連なると共に後端が開口し
た円筒状のスリーブ７とを一体に形成してなり、上記連
結基部６に上記スリーブ７で囲まれた空間部８に開口す
る円筒状の凹部１０を有すると共に、上記頭部５の先端
面と上記凹部１０の底面において開口する潤滑用通路１
１を有する本体部材１と、一端部が上記凹部１０に圧入
されると共に上記連結基部６にろう付け（Ａ)され、更
に、一端と他端において開口する潤滑用通路１２を有す
るパイプ状部材２と、上記スリーブ７の端部と上記パイ
プ状部材１２の他端との間に圧入されると共に上記スリ
ーブ７と上記パイプ状部材２にろう付け(Ｂ,Ｃ)されて
上記空間部８を塞ぐ蓋部材３とで構成されたことを特徴
としている。To achieve the above object, the present invention relates to a piston used in a piston pump or a piston motor, which has a substantially spherical head 5 to which a piston shoe is attached, and the head. 5 and a connecting sleeve 6 and a cylindrical sleeve 7 which is connected to the connecting sleeve 6 and has a rear end opened, are integrally formed, and a space 8 surrounded by the sleeve 7 is formed in the connecting sleeve 6. A lubricating passage 1 having a cylindrical recess 10 that opens and that opens at the tip surface of the head 5 and the bottom of the recess 10.
1, a pipe-shaped member 2 having a main body member 1 having one end and a lubricating passage 12 having one end press-fitted into the recess 10 and brazed (A) to the connecting base portion 6 and having one end and the other end opened. Is press-fitted between the end of the sleeve 7 and the other end of the pipe-shaped member 12, and is brazed (B, C) to the sleeve 7 and the pipe-shaped member 2 to close the space 8. It is characterized by being configured with the lid member 3.
【０００６】[0006]
【作用】上記構成からなるピストンは、連結基部６と円
筒状のスリーブ７で囲んだ空間部８を有するため、軽量
にでき、ピストンポンプおよびピストンモータの高圧・
高速化に適している。また、上記空間部８を蓋部材３で
塞いでその空間部８に流体が入り込まないようにしてい
るので、ピストンポンプおよびピストンモータの容積効
率が良くなる。また、本体部材１とパイプ状部材２と蓋
部材３との接合をろう付けで行っているので、溶接接合
部がなく、従って、剛性が低下せず、破壊等に対する信
頼性が向上する。更に、加工箇所の形状が円筒状である
ので、加工に特殊な工具を必要とせず、かつ、加工工数
が少なくてよい。The piston having the above structure has the space 8 surrounded by the connecting base 6 and the cylindrical sleeve 7, so that the piston can be made light and the high pressure of the piston pump and the piston motor can be reduced.
Suitable for speeding up. Further, since the space 8 is closed by the lid member 3 so that the fluid does not enter the space 8, the volumetric efficiency of the piston pump and the piston motor is improved. Further, since the main body member 1, the pipe-shaped member 2 and the lid member 3 are joined by brazing, there is no welded joint portion, therefore the rigidity is not lowered and the reliability against breakage is improved. Furthermore, since the shape of the processing location is cylindrical, no special tool is required for processing and the number of processing steps can be reduced.
【０００７】[0007]
【実施例】以下、この発明を図示の実施例により詳細に
説明する。図１はこの発明の一実施例の断面図である。
このピストンは、本体部材１とパイプ状部材２と蓋部材
３の３つの部材で構成されている。上記本体部材１は、
球状の頭部５と、この頭部に連なる連結基部６と、この
連結基部６に連なると共に後端が開口した円筒状のスリ
ーブ７とを一体に形成したものである。そして、その連
結基部６にその連結基部６と上記スリーブ７とで囲まれ
た空間部８に開口する円筒状の凹部１０を有し、更に、
その凹部１０の底面と上記頭部の先端面において開口す
る潤滑用通路１１を有している。また、上記パイプ状部
材２は、上記凹部１０の内径とほぼ同じ外径を有すると
共に、一端と他端において開口する潤滑用通路１２を有
しており、上記凹部１０に圧入された後、その周囲が連
結基部にろう付けされる。Ａはそのろう付け箇所を示
す。また、上記蓋部材３は、スリーブ７の後端部内径と
ほぼ同じ外径と、パイプ状部材２の外径とほぼ同じ内径
を有するドーナツ状に形成されていて、スリーブ７とパ
イプ状部材２との間に、スリーブの係止部１３で係止さ
れる位置まで圧入された後、後面の外周部および内周部
がそれぞれスリーブ７およびパイプ状部材２にろう付け
される。Ｂはそのろう付け箇所を示す。The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view of an embodiment of the present invention.
This piston is composed of three members, a main body member 1, a pipe-shaped member 2 and a lid member 3. The main body member 1 is
A spherical head portion 5, a connecting base portion 6 connected to the head portion, and a cylindrical sleeve 7 connected to the connecting base portion 6 and having a rear end opened are integrally formed. The connecting base 6 has a cylindrical recess 10 that opens into a space 8 surrounded by the connecting base 6 and the sleeve 7.
It has a lubrication passage 11 that opens at the bottom surface of the recess 10 and the tip surface of the head. Further, the pipe-shaped member 2 has an outer diameter substantially the same as the inner diameter of the recess 10 and has a lubrication passage 12 which is open at one end and the other end. The periphery is brazed to the connecting base. A indicates the brazing point. The lid member 3 is formed in a donut shape having an outer diameter substantially the same as the inner diameter of the rear end portion of the sleeve 7 and an inner diameter substantially the same as the outer diameter of the pipe-shaped member 2, and the sleeve 7 and the pipe-shaped member 2 are formed. After being press-fitted to a position where the sleeve is locked by the locking portion 13, the outer peripheral portion and the inner peripheral portion of the rear surface are brazed to the sleeve 7 and the pipe-shaped member 2, respectively. B shows the brazing part.
【０００８】このように組み立てられたピストンは、空
間部８を有しているため軽量であり、高圧・高速ポンプ
またはモータに使用できる。また、空間部８を蓋部材３
で蓋をして空間部に流体が入らないようにしているの
で、図２のピストンに比べてポンプまたはモータの容積
効率がよくなる。更に、本体部材１とパイプ状部材２と
の接合、および、蓋部材３と本体部材１およびパイプ状
部材２との接合をろう付けで行っているので、溶接接合
部がなく、従って、図３のピストンに比べて剛性が上が
り、破壊等に対する信頼性が向上する。また、ろう付け
による接合は、ろう付け炉によって一度に多量の処理が
可能であるので、接合工程が短縮でき、生産性が向上す
る。更に、図３のピストンが環状間隙４６,５５の工作
が必要であるため、専用の特殊刃具および加工機を必要
とし、しかも、加工工数が多くなるのに対して、本実施
例のピストンは、円筒上の穴を空けるだけの簡単な加工
で済むので、標準工具を使用でき、しかも、加工工数も
少なくて済む。The piston thus assembled is light in weight because it has the space 8 and can be used for a high-pressure / high-speed pump or a motor. In addition, the space portion 8 covers the lid member 3
Since the lid is used to prevent the fluid from entering the space, the volumetric efficiency of the pump or motor is improved as compared with the piston of FIG. Further, since the main body member 1 and the pipe-shaped member 2 and the lid member 3 and the main body member 1 and the pipe-shaped member 2 are joined by brazing, there is no welded joint portion, and therefore, FIG. The rigidity is higher than that of the piston and the reliability against breakage is improved. In addition, since a large amount of brazing can be processed at once by a brazing furnace, the brazing process can be shortened and the productivity is improved. Further, since the piston of FIG. 3 needs to machine the annular gaps 46 and 55, it requires a special special cutting tool and a processing machine, and the processing man-hour increases, whereas the piston of the present embodiment has Since it is as simple as drilling a hole on the cylinder, standard tools can be used, and the number of machining steps is small.
【０００９】[0009]
【発明の効果】以上より明らかなように、この発明のピ
ストンは、ピストンシューが取り付けられる略球状の頭
部と、この頭部に連なる連結基部と、この連結基部に連
なると共に後端が開口した円筒状のスリーブとを一体に
形成してなり、上記連結基部に上記スリーブで囲まれた
空間部に開口する円筒状の凹部を有すると共に、上記頭
部の先端面と上記凹部の底面において開口する潤滑用通
路を有する本体部材と、一端部が上記凹部に圧入される
と共に上記連結基部にろう付けされ、更に、一端と他端
において開口する潤滑用通路を有するパイプ状部材と、
上記スリーブの端部と上記パイプ状部材の他端との間に
圧入されると共に上記スリーブと上記パイプ状部材にろ
う付けされて上記空間部を塞ぐ蓋部材とで構成されてい
るので、以下のような効果がある。 連結基部とスリーブで囲まれた空間部を有しているた
め、軽量化が可能であり、従って、ピストンポンプおよ
びピストンモータの高圧・高速化が可能である。 上記空間部を蓋部材で塞いでその空間部に流体が入り
込まないようにしているので、ピストンポンプおよびピ
ストンモータの容積効率が良くなる。 本体部材とパイプ状部材と蓋部材との接合をろう付け
で行っているので、溶接接合部がなく、従って、剛性が
低下せず、破壊等に対する信頼性が向上する。また、ろ
う付け炉により一度に多量の接合が可能であるので、接
合工程を短縮でき、生産性が向上する。 加工箇所の形状が円筒状であるので、加工に特殊な工
具を必要とせず、かつ、加工工数が少なくてよい。As is apparent from the above, in the piston of the present invention, a substantially spherical head to which the piston shoe is attached, a connecting base portion connected to this head portion, and a rear end which is connected to this connecting base portion and whose rear end is opened. A cylindrical sleeve is integrally formed, and the connecting base has a cylindrical recess that opens into a space surrounded by the sleeve, and opens at the tip surface of the head and the bottom of the recess. A main body member having a lubricating passage, one end of which is press-fitted into the concave portion and brazed to the connecting base portion, and further a pipe-shaped member having a lubricating passage which is open at one end and the other end,
Since it is press-fitted between the end of the sleeve and the other end of the pipe-shaped member and is constituted by the sleeve and the lid member brazed to the pipe-shaped member to close the space, There is such an effect. Since it has a space surrounded by the connecting base and the sleeve, it is possible to reduce the weight, and thus to increase the pressure and speed of the piston pump and the piston motor. Since the space is closed by the lid member so that the fluid does not enter the space, the volumetric efficiency of the piston pump and the piston motor is improved. Since the main body member, the pipe-shaped member, and the lid member are joined by brazing, there is no welded joint, and therefore the rigidity is not reduced and the reliability against breakage is improved. Moreover, since a large amount of joining can be performed at once by the brazing furnace, the joining process can be shortened and the productivity is improved. Since the shape of the processing location is cylindrical, no special tool is required for processing, and the number of processing steps is small.
【図１】 この発明の一実施例の断面図である。FIG. 1 is a sectional view of an embodiment of the present invention.
【図２】 中空部の一端が開放されている従来例の断面
図である。FIG. 2 is a cross-sectional view of a conventional example in which one end of a hollow portion is open.
【図３】 慣性溶接により中空部を閉鎖した従来例の断
面図である。FIG. 3 is a sectional view of a conventional example in which a hollow portion is closed by inertia welding.
１…本体部材、２…パイプ状部材、３…蓋部材、５…頭
部、６…連結基部、７…スリーブ、８…空間部、１０…
凹部、１１,１２…潤滑用通路。DESCRIPTION OF SYMBOLS 1 ... Main body member, 2 ... Pipe-shaped member, 3 ... Lid member, 5 ... Head part, 6 ... Connection base part, 7 ... Sleeve, 8 ... Space part, 10 ...
Recesses, 11, 12 ... Passages for lubrication.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松本 国義 大阪府摂津市西一津屋１番１号 ダイキン 工業株式会社淀川製作所内 (72)発明者 平岡 正昭 大阪府摂津市西一津屋１番１号 ダイキン 工業株式会社淀川製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniyoshi Matsumoto No. 1-1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Works (72) Inventor Masaaki Hiraoka No. 1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Manufacturing Co., Ltd.
Claims (1)
使用されるピストンであって、 ピストンシューが取り付けられる略球状の頭部(５)と、
この頭部(５)に連なる連結基部(６)と、この連結基部
(６)に連なると共に後端が開口した円筒状のスリーブ
(７)とを一体に形成してなり、上記連結基部(６)に上記
スリーブ(７)で囲まれた空間部(８)に開口する円筒状の
凹部(１０)を有すると共に、上記頭部(５)の先端面と上
記凹部(１０)の底面において開口する潤滑用通路(１１)
を有する本体部材(１)と、 一端部が上記凹部(１０)に圧入されると共に上記連結基
部(６)にろう付け(Ａ)され、更に、一端と他端において
開口する潤滑用通路(１２)を有するパイプ状部材(２)
と、 上記スリーブ(７)の端部と上記パイプ状部材(１２)の他
端との間に圧入されると共に上記スリーブ(７)と上記パ
イプ状部材(２)にろう付け(Ｂ,Ｃ)されて上記空間部
(８)を塞ぐ蓋部材(３)とで構成されたことを特徴とする
ピストン。1. A piston used in a piston pump or a piston motor, the head having a substantially spherical shape to which a piston shoe is attached,
A connecting base (6) connected to the head (5) and the connecting base
Cylindrical sleeve connected to (6) and open at the rear end
(7) is integrally formed, and the connecting base (6) has a cylindrical recess (10) opening into a space (8) surrounded by the sleeve (7) and the head portion Lubrication passage (11) opening at the tip surface of (5) and the bottom surface of the recess (10)
A body member (1) having an end, and one end of which is press-fitted into the recess (10) and is brazed (A) to the connecting base (6), and further has a lubricating passage (12) opened at one end and the other end. (2)
And press-fitted between the end of the sleeve (7) and the other end of the pipe-shaped member (12) and brazed (B, C) to the sleeve (7) and the pipe-shaped member (2). The above space
A piston comprising a lid member (3) for closing (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3260320A JP3008602B2 (en) | 1991-10-08 | 1991-10-08 | piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3260320A JP3008602B2 (en) | 1991-10-08 | 1991-10-08 | piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0599134A true JPH0599134A (en) | 1993-04-20 |
| JP3008602B2 JP3008602B2 (en) | 2000-02-14 |
Family
ID=17346379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3260320A Expired - Lifetime JP3008602B2 (en) | 1991-10-08 | 1991-10-08 | piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3008602B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002061743A (en) * | 2000-07-20 | 2002-02-28 | Sauer Danfoss Inc | Closed-cavity piston for hydraulic unit |
| KR100558701B1 (en) * | 1999-03-31 | 2006-03-10 | 한라공조주식회사 | Piston for variable capacity swash plate type compressor |
| JP2018099697A (en) * | 2016-12-19 | 2018-06-28 | 旭サナック株式会社 | Inspection device for heading machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101721640B1 (en) * | 2015-11-24 | 2017-03-30 | 훌루테크 주식회사 | Manufacturing Method Of Piston |
-
1991
- 1991-10-08 JP JP3260320A patent/JP3008602B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100558701B1 (en) * | 1999-03-31 | 2006-03-10 | 한라공조주식회사 | Piston for variable capacity swash plate type compressor |
| JP2002061743A (en) * | 2000-07-20 | 2002-02-28 | Sauer Danfoss Inc | Closed-cavity piston for hydraulic unit |
| JP2018099697A (en) * | 2016-12-19 | 2018-06-28 | 旭サナック株式会社 | Inspection device for heading machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3008602B2 (en) | 2000-02-14 |
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