JPS6161993A - Inscribed gear pump - Google Patents
Inscribed gear pumpInfo
- Publication number
- JPS6161993A JPS6161993A JP18416484A JP18416484A JPS6161993A JP S6161993 A JPS6161993 A JP S6161993A JP 18416484 A JP18416484 A JP 18416484A JP 18416484 A JP18416484 A JP 18416484A JP S6161993 A JPS6161993 A JP S6161993A
- Authority
- JP
- Japan
- Prior art keywords
- discharge port
- space
- rotor
- volume
- discharge
- 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
Classifications
-
- 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
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、アウターロータとインナーロータのそれぞ
れに歯数差が１となるトロコイド歯を有する内接型ギヤ
ポンプに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal gear pump having trochoidal teeth with a difference in the number of teeth of 1 on each of an outer rotor and an inner rotor.
この種のポンプは、第４図乃至第６図に表わすように、
ｎ（ｎ≧３）枚のトロコイド歯を有するアウターロータ
１と、ｎ−１枚のトロコイド歯を有するインナーロータ
２とをケーシング３内に装備していて、点Ｏ３を中心と
してインナーロータ２を図中左方への矢印方向へ回転駆
動させ、かつ点０１を中心としてアウターロータ１を同
方向へ追従回転させることにより、両ロータ１，２のト
ロコイド歯間に形成される空間Ｓの容積を、点Ｏ７゜０
、を結ぶ直線上のＰ１位置で最大、Ｐ２位置で最小とす
るように順次変化させる。ケーシング３において、両ロ
ータ１，２の端面に対向する側部分には、空間Ｓの容積
が最小となる位置Ｐ２側から最大となる位置Ｐ１側へ向
って周方向に延在する吸入ポート４と、空間Ｓの容積が
最大となる位置Ｐ１側から最小となる位置Ｐ、側へ向か
って周方向に延在する吐出ポート５が設けられている。This type of pump, as shown in Figures 4 to 6,
An outer rotor 1 having n (n≧3) trochoid teeth and an inner rotor 2 having n-1 trochoid teeth are installed in a casing 3. By rotating the outer rotor 1 in the direction of the arrow to the left of the center and following the rotation of the outer rotor 1 in the same direction around point 01, the volume of the space S formed between the trochoidal teeth of both rotors 1 and 2 is Point O7゜0
, is changed sequentially so that it is maximum at position P1 and minimum at position P2 on the straight line connecting . In the casing 3, a suction port 4 extending in the circumferential direction from the position P2 side where the volume of the space S is the minimum to the position P1 side where the volume is the maximum is provided on the side portion facing the end faces of both the rotors 1 and 2. , a discharge port 5 is provided that extends in the circumferential direction from the position P1 side where the volume of the space S is maximum to the position P side where the volume is the minimum.
こうした構成により、両ロータ１，２の回転に伴なって
、吸入ポート４がら空間Ｓ内に流体が吸い込まれ、そし
てその流体が加圧されて吐出ポート５から吐出される。With this configuration, as both rotors 1 and 2 rotate, fluid is sucked into the space S through the suction port 4, and then the fluid is pressurized and discharged from the discharge port 5.
第５図は、吸入ポート４の終端部と吐出ポート５の始端
部との間、つまり位置Ｐ、にて空間Ｓが最大容積の状態
に締切られているときを表わし、第６図はその最大容積
の空間Ｓが小さくなり始めて、その内部の流体が吐出ポ
ート５から吐出され始めたときの状態を表わす。FIG. 5 shows a state in which the space S is closed to its maximum volume between the terminal end of the suction port 4 and the beginning end of the discharge port 5, that is, at position P, and FIG. This shows the state when the volume of the space S starts to become smaller and the fluid inside it starts to be discharged from the discharge port 5.
従来、吸入ポート４と吐出ポート５は、第４図に表わす
ように、点ＯＩを中心とする半径Ｒ１の大円弧り、 と
、点Ｏ６を中心とする半径Ｒ２の小円＠Ｌ２と、図中上
下方向に治う直線り、によって画かれるような形状に形
成されていた。Conventionally, as shown in FIG. 4, the suction port 4 and the discharge port 5 are formed into a large circular arc with radius R1 centered at point OI, a small circle @L2 with radius R2 centered at point O6, and It was formed in a shape that seemed to be drawn by a straight line that stretched upward and downward.
上記した従来の形状の吸入ポート４と吐出ポート５のう
ち、その吐出ポート５については次のような問題があっ
た。Among the suction port 4 and the discharge port 5 having the conventional shapes described above, the discharge port 5 has the following problems.
第５図に表わすように位置Ｐ、で締切られた空間Ｓが第
６図に表わすような状態になって、その内部の流体が吐
出ポート５から吐出され始めた当初、その空間Ｓが小さ
くなるも、未だ吐出ポート５との連通部が狭く、比較的
大きな流体の吐出抵抗を生じる。これが、ポンプ自体の
性能を悪化させる原因となっていた。When the space S, which is closed off at the position P as shown in Fig. 5, becomes in the state shown in Fig. 6, and the fluid inside the space S starts to be discharged from the discharge port 5, the space S becomes smaller. However, the communication portion with the discharge port 5 is still narrow, resulting in relatively large fluid discharge resistance. This caused the performance of the pump itself to deteriorate.
この発明、こうした従来の問題を解決するものである。This invention solves these conventional problems.
この発明の内接型ギヤポンプは、吸入ポートの終端部と
吐出ポートの始端部との間にて空間を締切る状態にある
インナーロータのトロコイド歯のロータ回転方向側トロ
コイド曲面と、前記インナーロータの各トロコイド歯の
トロコイド曲面の内接円によって画成される部位に臨む
位置に、吐出ポートの始端部を延在させたことを特徴と
する。The internal gear pump of the present invention has a trochoid curved surface on the rotor rotation direction side of the trochoid teeth of the inner rotor that closes off a space between the terminal end of the suction port and the start end of the discharge port; It is characterized in that the starting end of the discharge port extends to a position facing a region defined by the inscribed circle of the trochoid curved surface of each trochoid tooth.
以下、この発明の実施例を第１図乃至第３図に基づいて
説明する。この発明によるポンプは吐出ポートの始端部
の形状に特徴を有するので、前述した従来例のものと同
様のその他の部分については同一符号を付してその説明
を省略する。Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Since the pump according to the present invention is characterized by the shape of the starting end of the discharge port, other parts similar to those of the prior art example described above will be designated by the same reference numerals and a description thereof will be omitted.
この発明によれば、前述した従来例のものと同様に形成
されたケーシング３の吐出ポート５における始端部、つ
まり空間Ｓの容積が最大となる位置Ｐ１側からその容積
が最小となる位置Ｐｔ側へ向って周方向に延在す吐出ポ
ート５におけるその位置Ｐ１側の端部に、図中矢印のロ
ータ回転方向と反対の方向に延在する延出ｆＥ５ａを新
たに付設している。との延出部５ａは、吐出ポート５の
始端縁を画く直線Ｌ３から延出して、次のような曲面Ａ
と仮想内接円Ｂとによって画成される部位に臨む位置に
延在している。前者の曲面Ａは、吸入ポート４の終端部
と吐出ポート５の始端部にて空間Ｓを締切る状態（第２
図の状態）にあるインナーロータ２のトロコイド歯のロ
ータ回転方向側トロコイド曲面であり、一方、後者の仮
想内接円Ｂは、第２図中２点鎖線で表わすようにインナ
ーロータ２の各トロコイド曲面の仮想の内接円である。According to this invention, from the starting end of the discharge port 5 of the casing 3 formed similarly to the conventional example described above, that is, from the position P1 side where the volume of the space S is maximum, to the position Pt where the volume is the minimum. An extension fE5a extending in the direction opposite to the rotor rotational direction indicated by the arrow in the figure is newly attached to the end of the discharge port 5 on the side of position P1, which extends in the circumferential direction. The extending portion 5a extends from the straight line L3 that defines the starting edge of the discharge port 5, and forms the following curved surface A.
and a virtual inscribed circle B. The former curved surface A closes off the space S at the terminal end of the suction port 4 and the starting end of the discharge port 5 (second
This is the trochoid curved surface of the trochoid teeth of the inner rotor 2 in the rotor rotation direction when the inner rotor 2 is in the state shown in FIG. It is a virtual inscribed circle of a curved surface.
延出部５ａは、これらの曲面Ａ１内接円Ｂによって画成
される部位に臨むように１それらに沿う円弧、トロコイ
ド曲線あるいは直線たよって画かれる形状として形成さ
れている。The extending portion 5a is formed as a circular arc, a trochoidal curve, or a straight line extending along the curved surface A1 and the inscribed circle B so as to face the region defined by the curved surface A1 and the inscribed circle B.
本実施例では、空間Ｓが位置Ｐ、にて最大容積の状態に
締切られた直後、つまり第２図の状態から両ロータ１，
２が矢印方向に回転した直後に、インナーロータ２のト
ロコイド歯が吐出ポート５の延出部５ａを塞ぐ位置から
ずれて、位置Ｐ、の空間Ｓに対してその延出部５＆を開
くよう忙、延出部５＆を形成している。In this embodiment, immediately after the space S is closed to the maximum volume at the position P, that is, from the state shown in FIG.
Immediately after the inner rotor 2 rotates in the direction of the arrow, the trochoidal teeth of the inner rotor 2 shift from the position of blocking the extension 5a of the discharge port 5, and are busy opening the extension 5& to the space S at the position P. , forming an extending portion 5&.
しかして、このように吐出ポート５の始端部に延出部５
ａを設けたことにより、位置Ｐ１の締切られた空間Ｓが
吐出ポート５に対して開かれる初期の時点にて（第３図
参照）、その空間Ｓは延出部５ａによる広い連通部を通
して吐出ポート５に直ちに連通される。すなわち、従来
例の第６図との比較から明らかなように、位置Ｐ１の空
間Ｓが小さくなり始めてその内部の流体が吐出ポート５
から吐出され始めた時点において、延出部５ａは直ちに
広く開かれて、位置Ｐ１の空間Ｓと吐出ポート５との連
通路を従来に比して充分に大きく成す。したがって、位
置Ｐ、の空間Ｓ内の流体に対する初期の時点での流体吐
出面積が充分に広く、その空間Ｓ内からの流体の吐出が
大きな抵抗を生じることなくスムーズに行なわれる。こ
の結果、ポンプ自体の性能の悪化、およびキャビテーシ
ョン現象の発生が回避される。Thus, the extending portion 5 is formed at the starting end of the discharge port 5.
a, at the initial point in time when the closed space S at position P1 is opened to the discharge port 5 (see Fig. 3), the space S is discharged through the wide communication section formed by the extension part 5a. It is immediately communicated to port 5. That is, as is clear from a comparison with the conventional example shown in FIG.
At the point when discharge begins, the extending portion 5a is immediately opened widely, and the communication path between the space S at the position P1 and the discharge port 5 is made sufficiently larger than before. Therefore, the initial fluid discharge area for the fluid in the space S at the position P is sufficiently large, and the fluid can be smoothly discharged from the space S without causing any large resistance. As a result, deterioration in the performance of the pump itself and occurrence of cavitation phenomena are avoided.
・また、本実施例のように、空間Ｓが位置Ｐ１にて最大
容積の状態に締切られた直後に吐出ポート５の延出部５
ａが開かれるようその延出部５ａの大きさ、形状を設定
したことは、その空間Ｓ内に流体を封じた状態で加圧す
る事態を回避して、効率良く流体を加圧して吐出させる
上で有利である。-Also, as in this embodiment, immediately after the space S is closed to the maximum volume state at the position P1, the extension portion 5 of the discharge port 5
The size and shape of the extending portion 5a are set so that the space S is opened, so that the fluid can be efficiently pressurized and discharged by avoiding the situation where the fluid is pressurized while being sealed in the space S. It is advantageous.
また、延出部５ａは、最大容積の状態の空間Ｓに若干入
シ込むような位置に形成してもよい。Further, the extending portion 5a may be formed at a position such that it slightly enters the space S in the maximum volume state.
以上説明したように、との発明による内接型ギヤポンプ
は、吐出ポートの始端部をロータの回転方向と反対の方
向へ延在させて、アウターロータとインナーロータとの
間にて締切られた空間が小さくなり始める当初において
、その空間から吐出ポートへの流体吐出面積を充分に大
きく形成する構成であるから、流体の吐出抵抗を抑え、
キャビテーション現象の発生を防止して、ポンプの性能
を大幅に向上させることができる。As explained above, in the internal gear pump according to the invention, the starting end of the discharge port extends in the direction opposite to the rotating direction of the rotor, and a space is defined between the outer rotor and the inner rotor. Since the configuration creates a sufficiently large fluid discharge area from the space to the discharge port at the time when the discharge port starts to decrease, the fluid discharge resistance is suppressed and
The cavitation phenomenon can be prevented and the performance of the pump can be greatly improved.
第１図乃至第３図はこの発明の一実施例を表わし、第１
図はケーシングの断面図、第２図は吸入ポートの終端部
と吐出ポートの始端部との間にて空間が締切られた状態
における断面図、第３図は第２図の状態からロータが若
干回転したときの断面図、第４図乃至第６図は従来例を
表わし、第４図はケーシング断面図、第５図は吸入ポー
トの終端部と吐出ポートの始端部との間にて空間が締切
られた状態における断面図、第６図は第５図の状態から
ロータが若干回転したときの断面図である。
１・・・・・・アウターロータ、２・・・・・・インナ
ーロータ、３・・・・・・ケーシング、４・・・・・・
吸入ポート、５・・・・・、吐出ポート、５ａ・・・・
・・延出部。
第１図
Ｌ３
第３FIGS. 1 to 3 show one embodiment of the present invention.
The figure is a cross-sectional view of the casing, Figure 2 is a cross-sectional view with the space closed between the terminal end of the suction port and the start end of the discharge port, and Figure 3 is a slightly different view of the rotor from the state shown in Figure 2. 4 to 6 show a conventional example, and FIG. 4 is a sectional view of the casing, and FIG. 5 shows a space between the terminal end of the suction port and the starting end of the discharge port. FIG. 6 is a cross-sectional view of the closed state, and FIG. 6 is a cross-sectional view of the rotor slightly rotated from the state of FIG. 1...Outer rotor, 2...Inner rotor, 3...Casing, 4...
Suction port, 5..., discharge port, 5a...
・Extension part. Figure 1 L3 3rd
Claims (1)
と、ｎ−１枚のトロコイド歯を有するインナーロータと
をケーシング内に装備し、両ロータの端面に対向するケ
ーシング側部分に、両ロータのトロコイド歯の間に形成
される空間の容積が最小となる位置側から最大となる位
置側へ向かつて周方向に延在する吸入ポートと、前記空
間の容積が最大となる位置側から最小となる位置側へ向
かつて周方向に延在する吐出ポートとを有してなる内接
型ギヤポンプにおいて、前記吸入ポートの終端部と前記
吐出ポートの始端部との間にて前記空間を締切る状態に
あるインナーロータのトロコイド歯のロータ回転方向側
トロコイド曲面と、前記インナーロータの各トロコイド
歯のトロコイド曲面の内接円とによつて画成される部位
に臨む位置に、前記吐出ポートの始端部を延在させたこ
とを特徴とする内接型ギヤポンプ。An outer rotor having n (n≧3) trochoid teeth and an inner rotor having n-1 trochoid teeth are installed in the casing. A suction port that extends in the circumferential direction from the position where the volume of the space formed between the trochoid teeth is the minimum to the position where the volume is the maximum, and the volume of the space is the minimum from the position where the volume is the maximum. In an internal gear pump having a discharge port extending in a circumferential direction toward a position side, the space is closed between a terminal end of the suction port and a starting end of the discharge port. The starting end of the discharge port is located at a position facing a region defined by a trochoidal curved surface on the rotor rotation direction side of a trochoidal tooth of a certain inner rotor and an inscribed circle of a trochoidal curved surface of each trochoidal tooth of the inner rotor. An internal gear pump characterized by being extended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18416484A JPS6161993A (en) | 1984-09-03 | 1984-09-03 | Inscribed gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18416484A JPS6161993A (en) | 1984-09-03 | 1984-09-03 | Inscribed gear pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6161993A true JPS6161993A (en) | 1986-03-29 |
| JPS6347915B2 JPS6347915B2 (en) | 1988-09-26 |
Family
ID=16148480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18416484A Granted JPS6161993A (en) | 1984-09-03 | 1984-09-03 | Inscribed gear pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6161993A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5733111A (en) * | 1996-12-02 | 1998-03-31 | Ford Global Technologies, Inc. | Gerotor pump having inlet and outlet relief ports |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH032520U (en) * | 1989-05-26 | 1991-01-11 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441722A (en) * | 1977-09-09 | 1979-04-03 | Fuji Xerox Co Ltd | Scanning apparatus in copying machine |
| JPS5982594A (en) * | 1982-10-29 | 1984-05-12 | Sumitomo Electric Ind Ltd | Rotary pump |
-
1984
- 1984-09-03 JP JP18416484A patent/JPS6161993A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441722A (en) * | 1977-09-09 | 1979-04-03 | Fuji Xerox Co Ltd | Scanning apparatus in copying machine |
| JPS5982594A (en) * | 1982-10-29 | 1984-05-12 | Sumitomo Electric Ind Ltd | Rotary pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5733111A (en) * | 1996-12-02 | 1998-03-31 | Ford Global Technologies, Inc. | Gerotor pump having inlet and outlet relief ports |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6347915B2 (en) | 1988-09-26 |
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