JPS6347915B2 - - Google Patents
Info
- Publication number
- JPS6347915B2 JPS6347915B2 JP59184164A JP18416484A JPS6347915B2 JP S6347915 B2 JPS6347915 B2 JP S6347915B2 JP 59184164 A JP59184164 A JP 59184164A JP 18416484 A JP18416484 A JP 18416484A JP S6347915 B2 JPS6347915 B2 JP S6347915B2
- Authority
- JP
- Japan
- Prior art keywords
- discharge port
- trochoid
- space
- rotor
- inner rotor
- 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
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)
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O2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O1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
O1，O2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側へ向つて周方向に延在す
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P2側へ向かつて周方
向に延在する吐出ポート５が設けられている。こ
うした構成により、両ロータ１，２の回転に伴な
つて、吸入ポート４から空間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。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
P1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。
As shown in FIGS. 4 to 6, this type of pump has an outer rotor 1 having n (n≧3) trochoid teeth and an inner rotor 2 having n-1 trochoid teeth in a casing. By rotating the inner rotor 2 in the direction of the arrow to the left in the figure, centering on point O2, and following the rotation of the outer rotor 1 in the same direction, centering on point O1. , the volume of the space S formed between the trochoid teeth of both rotors 1 and 2 is expressed as a point.
It is sequentially changed so that it is maximum at the P 1 position and minimum at the P 2 position on the straight line connecting O 1 and O 2. Casing 3
In the side portions facing the end surfaces of both rotors 1 and 2, there is a suction port 4 extending in the circumferential direction from the position P 2 side where the volume of the space S is the minimum to the position P 1 side where the volume is the maximum. , a discharge port 5 is provided that extends in the circumferential direction from the position P 1 where the volume of the space S is maximum to the position P 2 where it is the minimum. With this configuration, as both rotors 1 and 2 rotate, fluid is sucked into the space S from the suction port 4, and the fluid is pressurized to the discharge port 5.
It is discharged from. FIG. 5 shows the position between the terminal end of the suction port 4 and the starting end of the discharge port 5.
At P 1 , the space S is closed to its maximum volume, and Figure 6 shows the space S at its maximum volume.
This shows the state when the internal fluid starts to be discharged from the discharge port 5 as it starts to become small.
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O1を中心とする半径R1の大
円弧L1と、点O2を中心とする半径R2の小円弧L2
と、図中上下方向に沿う直線L3によつて画かれ
るような形状に形成されていた。 Conventionally, the suction port 4 and the discharge port 5 are formed into a large arc L 1 with a radius R 1 centered on a point O 1 and a small arc L 2 with a radius R 2 centered on a point O 2 , as shown in FIG. 2
It was formed in a shape drawn by a straight line L3 along the vertical direction in the figure.
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
うな問題があつた。
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P1で締切られた空
間Ｓが第６図に表わすような状態になつて、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
せる原因となつていた。 As shown in Fig. 5, when the space S closed off at position P1 becomes in the state shown in Fig. 6, and the fluid inside 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 has been a cause of deteriorating the performance of the pump itself.
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
接円によつ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P2側へ向
つ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部５ａを新たに付設し
ている。この延出部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とによつ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。延出部５ａは、これらの曲面Ａ、内接円Ｂに
よつて画成される部位に臨むように、それらに沿
う円弧、トロコイド曲線あるいは直線によつて画
かれる形状として形成されている。 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, the position P 1 where the volume of the space S is maximum, to the position P where the volume is minimum. At the end of the discharge port 5 that extends in the circumferential direction toward the P1 side, an extending portion 5a that extends in the direction opposite to the rotor rotation direction indicated by the arrow in the figure is newly added. There is. This extending portion 5a extends from a straight line L3 that defines the starting edge of the discharge port 5, and extends to a position facing a region defined by a curved surface A and a virtual inscribed circle B as shown below. are doing. The former curved surface A is a trochoid curved surface on the rotor rotation direction side of the trochoid teeth of the inner rotor 2 in a state where the space S is closed off at the terminal end of the suction port 4 and the start end of the discharge port 5 (the state shown in FIG. 2). Yes, on the other hand, the latter virtual inscribed circle B
is an imaginary inscribed circle of each trochoidal curved surface of the inner rotor 2, as shown by the two-dot chain line in FIG. The extending portion 5a is formed in a shape defined by a circular arc, a trochoid curve, or a straight line along the curved surface A and the inscribed circle B so as to face the region defined by the curved surface A and the inscribed circle B.
本実施例では、空間Ｓが位置P1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P1の
空間Ｓに対してその延出部５ａを開くように、延
出部５ａを形成している。 In this embodiment, immediately after the space S is closed to its maximum volume at position P1 , that is, immediately after both rotors 1 and 2 rotate in the direction of the arrow from the state shown in FIG.
The trochoid teeth of the inner rotor 2 are connected to the discharge port 5.
The extending portion 5a is formed so as to be shifted from the position where the extending portion 5a is closed and open to the space S at the position P1 .
しかして、このように吐出ポート５の始端部に
延出部５ａ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。したがつて、位置P1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、およびキヤビテーシヨ
ン現象の発生が回避される。 By providing the extending portion 5a at the starting end of the discharge port 5 in this way, the closed space S at the position P1 is opened to the discharge port 5 at an initial point in time (see Fig. 3). ), the space S is immediately communicated with the discharge port 5 through a wide communication portion formed by the extension portion 5a. That is, as is clear from the comparison with the conventional example shown in FIG .
At the point when discharge begins, the extending portion 5a immediately opens widely, forming a communication path between the space S at the position P1 and the discharge port 5, which is sufficiently larger than in the past. Therefore, the fluid discharge area at the initial point in time for the fluid in the space S at the position P1 is sufficiently large;
The fluid can be smoothly discharged from the space S without generating large resistance. As a result,
Deterioration of the performance of the pump itself and occurrence of cavitation phenomenon 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５ａ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。また、延出部５ａは、最大容積の状態の空間
Ｓに若干入り込むような位置に形成してもよい。 In addition, as in this embodiment, the size and shape of the extending portion 5a of the discharge port 5 are adjusted so that the extending portion 5a of the discharge port 5 is opened immediately after the space S is closed to the maximum volume state at the position P1. This setting is advantageous in avoiding a situation in which the fluid is pressurized while being sealed in the space S, and in efficiently pressurizing and discharging the fluid. Further, the extending portion 5a may be formed at a position where it slightly enters the space S in the maximum volume state.
以上説明したように、こ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、キヤビ
テーシヨ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 present invention, the starting end of the discharge port extends in the direction opposite to the rotating direction of the rotor, so that a space closed between the outer rotor and the inner rotor is created. The structure creates a sufficiently large fluid discharge area from the space to the discharge port when the pump starts to become smaller, which reduces fluid discharge resistance and prevents the cavitation phenomenon, greatly improving pump performance. can be done.
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。
Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a sectional view of the casing, and Figure 2 showing a space closed off between the terminal end of the suction port and the starting end of the discharge port. FIG. 3 is a sectional view when the rotor has rotated slightly from the state shown in FIG. 2, FIGS. 4 to 6 show conventional examples, and FIG.
The figure is a cross-sectional view of the casing, Figure 5 is a cross-sectional view with the space closed between the end of the suction port and the start of the discharge port, and Figure 6 is a slight rotation of the rotor from the state shown in Figure 5. FIG. 1...Outer rotor, 2...Inner rotor, 3...Casing, 4...Suction port, 5...
...Discharge port, 5a...extension part.
Claims (1)
ターロータと、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。1 An outer rotor having n (n≧3) trochoid teeth and an inner rotor having n-1 trochoid teeth are installed in the casing, and both rotors are mounted on the casing side portion facing the end surfaces of both rotors. 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; In an internal gear pump having a discharge port extending in the circumferential direction toward a position, the space is closed between a terminal end of the suction port and a starting end of the discharge port. The trochoid curved surface of the trochoid tooth of the inner rotor on the rotor rotation direction side,
An internal gear pump characterized in that a starting end of the discharge port extends to a position facing a region defined by an inscribed circle of a trochoid curved surface of each trochoid tooth of the inner rotor.
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 JPS6161993A (en) | 1986-03-29 |
| JPS6347915B2 true 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 |
|---|---|---|---|---|
| JPH032520U (en) * | 1989-05-26 | 1991-01-11 |
Families Citing this family (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 |
Family Cites Families (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
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH032520U (en) * | 1989-05-26 | 1991-01-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6161993A (en) | 1986-03-29 |
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