JPH05215078A - Internal gear pump - Google Patents

Abstract

PURPOSE:To prevent excessive pressure rise of a contracting chamber in low- speed rotating area by using a simple structure in an internal gear pump provided for suppressing an increase in discharge quantity accompanying the rotating speed rise of a driving shaft in high-speed rotating area. CONSTITUTION:Tongue piece parts 24,... are formed on thin plate members 6, 7 sliding in contact with both axial side surface of both gears 10, 12, and the tongue piece parts 24... are tilted and opened with a root 24A as the center so that the liquid in the contracting chambers 22A... can be freely discharged to a discharge port 20, when the liquid pressure of contracting chambers 22A-22C partitioned between a maximum volume chamber 14 and a discharge chamber 19 is raised over an allowable value by the volume reduction accompanying the rotation of both the gears 10, 12. Further, when the liquid pressure of the contracting chambers 22A... is reduced to the allowable value while having the self elastic force acting on the restoring direction in the opened state, the tongue piece parts are closed by the self elastic force, and an elastic member which has been separately provided as in a conventional pump is not required.

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、外歯歯車と内歯歯車と
を内接噛合して設け、外歯歯車を回転駆動する駆動軸の
回転数上昇に伴う吐出量の増加を抑制する内接歯車ポン
プに関し、特に車両用のポンプとして好適なものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal gear which is provided with an external gear and an internal gear which are internally meshed with each other to suppress an increase in the discharge amount due to an increase in the rotational speed of a drive shaft for rotationally driving the external gear. The contact gear pump is particularly suitable as a pump for vehicles.

【０００２】[0002]

【従来の技術】この種の内接歯車ポンプについて、本出
願人は先に特願平３−２９２１５７号を出願した。この
出願にかかる発明は、図４ないし図６に示す如く、本体
３５の内部に、内接噛合するよう外歯歯車３６と内歯歯
車３７とを回転自在に設け、駆動軸３８により外歯歯車
３６を回転駆動すると、両歯車３６、３７がともに同方
向へ回転して吸入ポート３９より吸入室４０に吸入した
液体を最大容積室４１、収縮室４２を経て吐出室４３に
搬送し吐出ポート４４から吐出するようにしている。そ
して、吸入ポート３９側に絞り４５を設け、駆動軸３８
の回転数が所定値（約１５００ｒｐｍ）以上の高回転域
まで上昇すると駆動軸３８の回転数上昇に伴う吸入量の
増加を抑制するように有し、これに起因して駆動軸３８
の回転数上昇に伴う吐出量の増加を抑制している。この
とき、絞り４５の絞り制御により吸入室４０に吸入する
液体中に気ほうを生じるが、この気ほうは両歯車３６、
３７の回転に伴いその容積を減少する収縮室４２内で滑
らかに消去されキャビテーションに伴う騒音等を生じな
いようにしている。2. Description of the Related Art Regarding the internal gear pump of this type, the present applicant previously applied for Japanese Patent Application No. 3-292157. The invention according to this application, as shown in FIGS. 4 to 6, has an external gear 36 and an internal gear 37 rotatably provided inside a main body 35 so as to be internally meshed with each other, and an external gear by a drive shaft 38. When 36 is rotationally driven, both gears 36 and 37 rotate in the same direction, and the liquid sucked from the suction port 39 into the suction chamber 40 is conveyed to the discharge chamber 43 through the maximum volume chamber 41 and the contraction chamber 42, and the discharge port 44 is discharged. It is designed to discharge from. Then, the throttle 45 is provided on the suction port 39 side, and the drive shaft 38
When the number of rotations of the drive shaft 38 increases to a high rotation range of a predetermined value (about 1500 rpm) or more, an increase in the suction amount due to the increase of the rotation speed of the drive shaft 38 is suppressed.
The increase in the discharge amount due to the increase in the number of rotations is suppressed. At this time, bubbles are generated in the liquid sucked into the suction chamber 40 by the throttle control of the throttle 45.
The volume is reduced in the contraction chamber 42 whose volume is reduced by the rotation of 37 so that noise and the like due to cavitation are not generated.

【０００３】また、駆動軸３８の回転数が絞り４５の影
響を受けない所定値以下の低回転域では、吸入室４０に
液体が満たされるので、この液体が収縮室４２の容積減
少により過剰に圧力上昇しないよう、両歯車３６、３７
の軸方向側面が摺接する側板部材４６に形成の弁座４７
に着座した板状の逆止弁４８が図５および図６の状態よ
り下方向に移動して開作動し収縮室４２内の液体の一部
を吐出ポート４４側に流出するよう設けている。Further, in a low rotation speed range where the rotation speed of the drive shaft 38 is not affected by the throttle 45 and is equal to or lower than a predetermined value, the suction chamber 40 is filled with the liquid, and this liquid is excessive due to the decrease in the volume of the contraction chamber 42. Both gears 36 and 37 to prevent pressure rise
Of the valve seat 47 formed on the side plate member 46 with which the axial side surface of the
The plate-like check valve 48 seated at the position is provided so as to move downward from the state shown in FIGS. 5 and 6 and open so that a part of the liquid in the contraction chamber 42 flows out to the discharge port 44 side.

【０００４】[0004]

【発明が解決しようとする課題】ところが、かかる構成
では、駆動軸３８の低回転域における収縮室４２の過剰
な圧力上昇を防止するよう開作動する板状の逆止弁４８
を弁座４７に着座する閉方向へ付勢する複数の弾性部材
４９Ａ、４９Ｂを本体３５内に格別に設けると共に、こ
の弾性部材４９Ａ、４９Ｂを収装するための孔５０Ａ、
５０Ｂを本体３５に形成しなければならず、逆止弁全体
の構成が複雑になる問題点があった。本発明は、かかる
問題点を解決するもので、駆動軸の低回転域における収
縮室の過剰な圧力上昇を防止する構成を簡単にして高回
転域における駆動軸の回転数上昇に伴う吐出量の増加を
良好に抑制し得るようにした内接歯車ポンプを提供する
ものである。However, in such a configuration, a plate-like check valve 48 that opens so as to prevent an excessive pressure increase in the contraction chamber 42 in the low rotation range of the drive shaft 38.
A plurality of elastic members 49A, 49B for urging the valve seat 47 on the valve seat 47 in the closing direction are specially provided in the main body 35, and holes 50A for accommodating the elastic members 49A, 49B are provided.
Since 50B has to be formed in the main body 35, there has been a problem that the overall structure of the check valve becomes complicated. The present invention solves such a problem, and simplifies the structure for preventing an excessive increase in pressure of the contraction chamber in the low rotation range of the drive shaft to simplify the discharge amount accompanying the increase in the rotation speed of the drive shaft in the high rotation range. (EN) An internal gear pump capable of suppressing the increase satisfactorily.

【０００５】[0005]

【課題を解決するための手段】このため本発明は、複数
の外歯を有して駆動軸により回転駆動される外歯歯車
と、外歯より多数の内歯を有する内歯歯車とを内接噛合
するよう本体内に偏心して回転自在に設け、この両歯車
の軸方向側面と摺接する薄板状の薄板部材を本体内に固
設して設け、両歯車の歯が最深に噛合う位置との対向側
に閉塞した最大容積室を区画形成し、最大容積室より両
歯車の回転方向における後側に液体を吸入する吸入ポー
トに連通の吸入室を区画形成すると共に、最大容積室よ
り両歯車の回転方向における先側に液体を吐出する吐出
ポートに連通の吐出室を区画形成し、かつ最大容積室と
吐出室との間に両歯車の回転に伴いその容積を減少する
収縮室を区画形成して成し、外歯歯車を回転駆動する駆
動軸の回転数が所定値以上に上昇すると駆動軸の回転数
上昇に伴う吸入量の増加を抑制するよう吸入ポート側を
絞り制御して設け、両歯車の軸方向側面が摺接して本体
内に固設した薄板部材には収縮室の液体圧力が許容値よ
り上昇したとき開作動してその液体を吐出ポート側へ流
出自在に舌片部を形成し、舌片部は収縮室の最大容積室
側を根元にして吐出室側を先端にする片持ち支持に設け
てその開状態で復元方向に作用する自己の弾性力を有し
て成る。Therefore, according to the present invention, an internal gear having a plurality of external teeth and rotationally driven by a drive shaft, and an internal gear having a larger number of internal teeth than the external teeth are provided. It is eccentrically rotatably provided in the main body so as to be in mesh with each other, and a thin plate-like thin plate member that slidably contacts the axial side surfaces of both gears is fixedly provided in the main body, and the teeth of both gears are deeply meshed with each other. A closed maximum volume chamber on the opposite side of the maximum volume chamber, and a suction chamber communicating with the suction port for sucking liquid on the rear side of the maximum volume chamber in the rotation direction of both gears. A discharge chamber that communicates with the discharge port that discharges liquid on the front side in the direction of rotation, and a contraction chamber that reduces its volume with the rotation of both gears is defined between the maximum volume chamber and the discharge chamber. The rotation speed of the drive shaft that drives the external gear to rotate is predetermined. The suction port side is controlled by throttle so as to suppress the increase of the suction amount due to the increase of the rotation speed of the drive shaft when it rises above, and the axial side surfaces of both gears are slidably in contact with the thin plate member fixed in the main body. When the liquid pressure in the contraction chamber rises above the allowable value, it opens to form a tongue piece that allows the liquid to flow out to the discharge port side.The tongue piece part is the discharge chamber with the maximum volume chamber side of the contraction chamber as the root. It is provided on a cantilevered support whose side is the tip and has its own elastic force acting in the restoring direction in its open state.

【０００６】[0006]

【作用】かかる本発明の構成において、吸入ポートより
吸入室に吸入する液体の吸入速度が遅くて吸入ポート側
の絞り制御が機能しない所定値以下の低回転域では、駆
動軸の回転数上昇に略比例して吸入量が増加し、これに
起因して吐出量が回転数上昇に略比例して増加する。こ
のとき、収縮室内は吸入室より最大容積室を経て搬送さ
れた液体で満たされるが、この液体の一部は両歯車の回
転に伴う収縮室の容積減少により内部の液体圧力が許容
値より上昇し薄板部材に形成した舌片部がその根元を中
心に傾動して開作動し吐出ポート側に流出され、収縮室
の過剰な圧力上昇を防止する。そして、吸入ポートより
吸入室に吸入する液体の吸入速度が速く吸入ポート側で
絞り制御される所定値以上の高回転域になると、この絞
り制御により駆動軸の回転数上昇に伴う吸入量の増加を
抑制し、これに起因して吐出量の増加を抑制する。この
とき、吸入室に吸入する液体中に気ほうを生じ、この気
ほうが液体とともに最大容積室を経て収縮室に搬送さ
れ、収縮室の液体圧力は気ほうにより許容値まで低下し
て薄板部材の舌片部が開状態より復元方向に作用する自
己の弾性力で閉作動し、収縮室内の気ほうは収縮室の容
積減少に伴い滑らかに消去されキャビテーションに伴う
騒音等を生じないようにしている。この作動で薄板部材
に形成して根元を中心に傾動して開作動する舌片部はそ
の開状態で復元方向に作用する自己の弾性力により閉作
動するから、従来のポンプの如く、逆止弁を閉方向へ付
勢する複数の弾性部材やこの弾性部材を収装するよう本
体に形成した孔を不要にでき、駆動軸の低回転域におけ
る収縮室の過剰な圧力上昇を防止する構成を簡単にでき
て、高回転域における駆動軸の回転数上昇に伴う吐出量
の増加を良好に抑制することができる。In the structure of the present invention, the rotational speed of the drive shaft is increased in a low rotational speed range below a predetermined value at which the suction speed of the liquid sucked into the suction chamber from the suction port is slow and the throttle control on the suction port side does not function. The suction amount increases substantially in proportion, and the discharge amount increases in proportion to the increase in the rotation speed. At this time, the contraction chamber is filled with the liquid that has been conveyed from the suction chamber through the maximum volume chamber, but part of this liquid increases the internal liquid pressure above the allowable value due to the decrease in the volume of the contraction chamber due to the rotation of both gears. Then, the tongue piece formed on the thin plate member tilts around its root to perform an opening operation and is discharged to the discharge port side, thereby preventing an excessive pressure rise in the contraction chamber. Then, when the suction speed of the liquid sucked into the suction chamber from the suction port is high and reaches a high rotation range above a predetermined value where the throttle is controlled on the suction port side, the throttle amount is increased by the throttle control due to the increase in the rotational speed of the drive shaft. Is suppressed, and an increase in the ejection amount due to this is suppressed. At this time, bubbles are generated in the liquid sucked into the suction chamber, and the bubbles are conveyed to the contraction chamber through the maximum volume chamber together with the liquid, and the liquid pressure in the contraction chamber is reduced to an allowable value by the bubble and the thin plate member The tongue piece is closed by its own elastic force that acts in the restoring direction from the open state, and the bubbles in the contraction chamber are smoothly erased as the volume of the contraction chamber decreases and noise such as cavitation does not occur. .. By this operation, the tongue part that is formed on the thin plate member and tilts about the base to open is closed by its own elastic force that acts in the restoring direction in the open state. It is possible to eliminate the need for a plurality of elastic members for urging the valve in the closing direction and holes formed in the main body for accommodating these elastic members, and to prevent an excessive pressure rise in the contraction chamber in the low rotation range of the drive shaft. It is easy to perform and it is possible to favorably suppress an increase in the discharge amount that accompanies an increase in the rotation speed of the drive shaft in the high rotation range.

【０００７】[0007]

【実施例】以下、本発明の一実施例を図面に基づいて説
明する。図１において、１は本体で、一端面に開口して
有底の嵌挿孔２を形成している。３は蓋部材で、嵌挿孔
２の開口を閉塞するよう本体１に複数のボルト部材４に
より固設している。５は本体１の嵌挿孔２に嵌挿したリ
ング部材で、６、７はリング部材５の軸方向両側面に当
接した炭素工具鋼鋼材のＳＫ５（ＪＩＳＧ４４０１）か
ら成る２個の薄い円板状の薄板部材で、８、９は薄板部
材６、７の背面に当接した２個の側板部材で、これらリ
ング部材５、薄板部材６、７、側板部材８、９は嵌挿孔
２に嵌挿した状態で蓋部材３を本体１に固設する前記の
ボルト部材４を利用して固設されている。なお、側板部
材８を本体１に側板部材９を蓋部材３にそれぞれ一体形
成しても良い。１０はリング部材５に貫設の内孔１１に
回転自在に嵌合した内歯歯車で、１０枚の内歯１０Ａを
有している。１２は駆動軸１３により回転駆動される外
歯歯車で、９枚の外歯１２Ａを有し、内歯歯車１０と内
接噛合するよう内孔１１の内歯歯車１０内部に偏心して
回転自在に設けている。そして、両歯車１０、１２とリ
ング部材５はその軸方向長さを略同等に設け、両歯車１
０、１２の軸方向両側面と薄板部材６、７を摺接自在に
設けている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a main body, which has a bottomed insertion hole 2 which is open at one end surface. A lid member 3 is fixed to the main body 1 by a plurality of bolt members 4 so as to close the opening of the fitting insertion hole 2. Reference numeral 5 is a ring member fitted into the fitting hole 2 of the main body 1, and 6 and 7 are two thin circular plates made of carbon tool steel SK5 (JISG4401) which are in contact with both axial side surfaces of the ring member 5. -Shaped thin plate members 8 and 9 are two side plate members that are in contact with the back surfaces of the thin plate members 6 and 7, and these ring member 5, thin plate members 6 and 7, and side plate members 8 and 9 are inserted into the insertion holes 2. The lid member 3 is fixedly mounted on the main body 1 in the fitted state by using the bolt member 4. The side plate member 8 and the side plate member 9 may be integrally formed with the main body 1 and the lid member 3, respectively. An internal gear 10 is rotatably fitted in an internal hole 11 penetrating the ring member 5 and has 10 internal teeth 10A. Reference numeral 12 denotes an external gear which is rotationally driven by a drive shaft 13 and which has nine external teeth 12A and is eccentrically rotatably eccentrically inside the internal gear 10 of the internal hole 11 so as to internally mesh with the internal gear 10. It is provided. The gears 10 and 12 and the ring member 5 are provided so that their axial lengths are substantially equal to each other.
The axially opposite side surfaces 0 and 12 and the thin plate members 6 and 7 are slidably provided.

【０００８】１４は両歯車１０、１２の歯１０Ａ、１２
Ａが最深に噛合う位置と対向側に位置した最大容積室
で、内歯１０Ａと外歯１２Ａとに囲まれて閉塞するよう
区画形成している。１５は吸入室で、最大容積室１４よ
り矢印Ｅで示す両歯車１０、１２の回転方向における後
側に、最大容積室１４の直後から両歯車１０、１２の歯
１０Ａ、１２Ａが最深に噛合う位置の近傍までの間にわ
たり内歯１０Ａと外歯１２Ａとに囲まれて区画形成して
いる。１６は液体を吸入する吸入ポートで、吸入室１５
と軸方向両側から連通するよう両歯車１０、１２の軸方
向両側面と摺接する薄板部材６、７および側板部材８、
９をそれぞれ貫通して円弧状に設けている。１７は両吸
入ポート１６が接続する吸入流路で、蓋部材３の外面に
開口した一端側より側板部材９、薄板部材７、リング部
材５、薄板部材６、側板部材８を貫通し側板部材８の背
面側を通って吸入流路１６の一方に接続すると共に、側
板部材９の背面側を通って吸入流路１６の他方に接続す
る二また状に設けている。１８は吸入流路１７に設置し
た絞りで、駆動軸１３の回転数が所定値以上に上昇する
と回転数上昇に伴う吸入量の増加を抑制するよう吸入ポ
ート１６に吸入する液体を絞り制御可能に設け、吸入室
１５の液体中に気ほうを生じるようにしている。Reference numeral 14 denotes teeth 10A and 12 of both gears 10 and 12.
A is a maximum volume chamber located on the opposite side to a position where A deepest meshes with each other, and is partitioned and formed so as to be enclosed and surrounded by the inner teeth 10A and the outer teeth 12A. Reference numeral 15 denotes a suction chamber, which has teeth 10A and 12A of both gears 10 and 12 deeply meshed immediately after the maximum volume chamber 14 behind the maximum volume chamber 14 on the rear side in the rotation direction of both gears 10 and 12. It is surrounded by the internal teeth 10A and the external teeth 12A to form a partition over the vicinity of the position. Reference numeral 16 is a suction port for sucking a liquid, which is a suction chamber 15
And the thin plate members 6 and 7 and the side plate members 8 that are in sliding contact with both axial side surfaces of both gears 10 and 12 so as to communicate with both axial directions.
9 are provided so as to pass through each of them and have an arc shape. Reference numeral 17 denotes an intake flow passage to which both intake ports 16 are connected. The intake plate 17 penetrates the side plate member 9, the thin plate member 7, the ring member 5, the thin plate member 6, and the side plate member 8 from one end side opened to the outer surface of the lid member 3. It is provided in a bifurcated shape that is connected to one of the suction flow paths 16 through the back side of the side plate member and connected to the other of the suction flow paths 16 through the back side of the side plate member 9. Reference numeral 18 denotes a throttle installed in the suction passage 17, and when the rotation speed of the drive shaft 13 rises above a predetermined value, the throttle control of the liquid sucked into the suction port 16 can be carried out so as to suppress the increase of the suction amount accompanying the rotation speed increase. It is provided so that bubbles are generated in the liquid in the suction chamber 15.

【０００９】１９は吐出室で、最大容積室１４より両歯
車１０、１２の回転方向Ｅにおける先側に、最大容積室
１４との間に４枚の内歯１０Ａが介在する位置から両歯
車１０、１２の歯１０Ａ、１２Ａが最深に噛合う位置の
近傍までの間にわたり内歯１０Ａと外歯１２Ａとに囲ま
れて区画形成している。２０は液体を吐出する吐出ポー
トで、図２に詳細に示す如く、吐出室１９と軸方向両側
から連通するよう薄板部材６、７を小円弧状に貫通し、
さらに側板部材８、９を薄板部材６、７の背面側を通っ
て最大容積室１４側に向けて延在する大円弧状に貫通
し、さらに本体１、蓋部材３の側板部材８、９が当接す
る当接面を側板部材８、９に貫通した大円弧状と同一形
状に窪み形成して設けている。そして、吐出ポート２０
は最大容積室１４側の開口始端２０Ａを最大容積室１４
との間に３枚の内歯１０Ａが介在し４枚目の内歯１０Ａ
の中心より回転方向Ｅにおける先側に位置するよう有す
ると共に、薄板部材６、７の背面側を通って最大容積室
１４側に向けて延在する延在端２０Ｂを最大容積室１４
との間に１枚の内歯１０Ａが介在して２枚目の内歯１０
Ａの中心より回転方向Ｅにおける僅か先側に位置するよ
う有している。２１は両吐出ポート２０が接続する吐出
流路で、吸入流路１７と同様に二また状に設けている。Reference numeral 19 denotes a discharge chamber, which is located ahead of the maximum volume chamber 14 in the rotational direction E of both gears 10 and 12 from the position where four internal teeth 10A are interposed between the maximum volume chamber 14 and both gears 10 and 12. , 12 teeth 10A, 12A are defined by being surrounded by the inner teeth 10A and the outer teeth 12A up to the vicinity of the deepest meshing position. Reference numeral 20 denotes a discharge port for discharging the liquid, as shown in detail in FIG. 2, penetrating the thin plate members 6 and 7 in a small arc shape so as to communicate with the discharge chamber 19 from both sides in the axial direction,
Further, the side plate members 8 and 9 are penetrated in the shape of a large arc extending toward the maximum volume chamber 14 side through the back side of the thin plate members 6 and 7, and the side plate members 8 and 9 of the main body 1 and the lid member 3 are The abutting surface to be abutted is provided by forming a depression in the same shape as a large arc penetrating the side plate members 8 and 9. And the discharge port 20
Is the opening end 20A on the side of the maximum volume chamber 14
There are three inner teeth 10A between the
The extension end 20 </ b> B extending toward the maximum volume chamber 14 side through the back side of the thin plate members 6 and 7 is provided at the front side in the rotation direction E from the center of the maximum volume chamber 14
And one inner tooth 10A is interposed between
It is located slightly ahead of the center of A in the rotational direction E. Reference numeral 21 denotes a discharge flow path to which both discharge ports 20 are connected, and like the suction flow path 17, it is provided in a bifurcated shape.

【００１０】２２Ａ、２２Ｂ、２２Ｃは両歯車１０、１
２の回転に伴いその容積を減少する３個の収縮室で、最
大容積室１４と吐出室１９との間にそれぞれ内歯１０Ａ
と外歯１２Ａとに囲まれて区画形成している。なお、収
縮室は２個または１個でも良く、その際には吐出ポート
２０の開口始端２０Ａを最大容積室１４側に延在し吐出
室１９を拡張して区画形成するが、延在端２０Ｂはその
ままで良い。２３、２４は薄板部材６、７に形成した舌
片部で、薄板部材６、７を小円弧状に貫通した吐出ポー
ト２０の開口始端２０Ａより側板部材８、９を大円弧状
に貫通した吐出ポート２０の外円弧と内円弧とにそれぞ
れ沿って最大容積室１４側に向けて切断し、その切断終
端を吐出ポート２０の延在端２０Ｂより僅かに最大容積
室１４側に位置して設けている。そして、舌片部２３、
２４は外円弧の切断終端と内円弧の切断終端との径方向
間を根元２３Ａ、２４Ａとし、先端をすなわち吐出ポー
ト２０の開口始端２０Ａとする片持ち支持に設け、収縮
室２２Ａ、２２Ｂ、２２Ｃの液体圧力が舌片部２３、２
４の背面に作用する吐出ポート２０の液体圧力すなわち
許容値より上昇したとき根元２３Ａ、２４Ａを中心に図
２に一点鎖線で示す如く傾動して開作動し収縮室２２
Ａ、２２Ｂ、２２Ｃの液体を吐出ポート２０へ流出自在
に設け、その開状態で復元方向に作用する自己の弾性力
を有する。22A, 22B and 22C are both gears 10, 1
With three contraction chambers whose volume decreases with the rotation of 2, the internal teeth 10A are respectively provided between the maximum volume chamber 14 and the discharge chamber 19.
It is surrounded by the outer teeth 12A to form a partition. The number of contraction chambers may be two or one. In that case, the opening start end 20A of the discharge port 20 extends toward the maximum volume chamber 14 side and the discharge chamber 19 is expanded to form a partition, but the extended end 20B. Can be left as is. Reference numerals 23 and 24 denote tongue pieces formed on the thin plate members 6 and 7, and discharges from the opening start end 20A of the discharge port 20 that penetrates the thin plate members 6 and 7 in a small arc shape and that penetrates the side plate members 8 and 9 in a large arc shape. Cut along the outer arc and the inner arc of the port 20 toward the maximum volume chamber 14 side, and provide the cutting end at a position slightly closer to the maximum volume chamber 14 side than the extending end 20B of the discharge port 20. There is. And the tongue piece 23,
Numeral 24 is provided in a cantilevered support with roots 23A, 24A between the radial ends of the outer arc cutting end and the inner arc cutting end, and the tip end being the opening start end 20A of the discharge port 20, ie, the cantilever support, and the contraction chambers 22A, 22B, 22C. The liquid pressure of the tongue pieces 23, 2
4 when the liquid pressure of the discharge port 20 acting on the back surface of the nozzle 4, that is, an allowable value, is raised, the base 23A, 24A is tilted to open as shown by the dashed line in FIG.
The liquids A, 22B, and 22C are provided so as to freely flow into the discharge port 20, and have their own elastic force that acts in the restoring direction in the open state.

【００１１】次に、かかる構成の作動を説明する。駆動
軸１３により外歯歯車１２を回転方向Ｅに回転駆動する
と、外歯１２Ａと内歯１０Ａが内接噛合する内歯歯車１
０が同方向に回転し、吸入流路１７の液体を吸入ポート
１６より吸入室１５に吸入し、この液体を最大容積室１
４、収縮室２２Ａ、２２Ｂ、２２Ｃを経て吐出室１９に
搬送し吐出ポート２０より吐出流路２１に吐出する。Next, the operation of this structure will be described. When the external gear 12 is rotationally driven in the rotational direction E by the drive shaft 13, the internal gear 1 in which the external teeth 12A and the internal teeth 10A mesh internally.
0 rotates in the same direction and sucks the liquid in the suction flow path 17 into the suction chamber 15 through the suction port 16, and the liquid is sucked into the maximum volume chamber 1
4. The particles are conveyed to the discharge chamber 19 through the contraction chambers 22A, 22B and 22C and discharged from the discharge port 20 to the discharge flow passage 21.

【００１２】そして、吸入ポート１６より吸入室１５に
吸入する液体の吸入速度が遅くて吸入流路１７に設置し
た絞り１８による液体の絞り制御が機能しない所定値以
下の低回転域では、駆動軸１３の回転数上昇に略比例し
て吸入量が増加し、これに起因して吐出量が回転数上昇
に略比例して増加する。このとき、収縮室２２Ａ、２２
Ｂ、２２Ｃ内は吸入室１５より最大容積室１４を経て搬
送された液体で満たされるが、この液体の一部は収縮室
２２Ａ、２２Ｂ、２２Ｃの容積減少により内部の液体圧
力が舌片部２３、２４の背面に作用する吐出ポート２０
の液体圧力すなわち許容値より上昇し舌片部２３、２４
が根元２３Ａ、２４Ａを中心に図２に一点鎖線で示す如
く傾動して開作動し吐出ポート２０に流出され、収縮室
２２Ａ、２２Ｂ、２２Ｃの液体圧力を吐出ポート２０の
液体圧力に舌片部２３、２４の開状態で復元方向に作用
する僅少な自己の弾性力を加えた値に維持し、収縮室２
２Ａ、２２Ｂ、２２Ｃの過剰な圧力上昇を防止する。そ
して、舌片部２３、２４がその開状態で復元方向に作用
する自己の弾性力が僅少で良いのは開状態で吐出ポート
２０の液体圧力が作用する背面とこれに対向して収縮室
２２Ａ、２２Ｂ、２２Ｃの液体圧力が作用する面とが同
一面積になるからである。In the low rotation speed range below a predetermined value, at which the suction speed of the liquid sucked into the suction chamber 15 from the suction port 16 is slow and the throttle control of the liquid by the throttle 18 installed in the suction passage 17 does not function, the drive shaft is in a low rotation range. The suction amount increases substantially in proportion to the increase in the rotation speed of No. 13, and the discharge amount increases in proportion to the increase in the rotation speed. At this time, the contraction chambers 22A and 22A
B and 22C are filled with the liquid conveyed from the suction chamber 15 through the maximum volume chamber 14, but a part of the liquid is reduced in volume of the contraction chambers 22A, 22B, and 22C so that the internal liquid pressure is reduced to the tongue portion 23. Discharge port 20 acting on the back of 24
Liquid pressure of the tongue 23, 24
2 is tilted about the roots 23A and 24A as shown by the alternate long and short dash line in FIG. 2 to be opened and discharged to the discharge port 20, and the liquid pressure in the contraction chambers 22A, 22B and 22C is changed to the liquid pressure in the discharge port 20 by the tongue portion. In the open state of 23 and 24, the elastic force of a little self acting in the restoring direction is maintained to a value added to the contraction chamber 2
Prevents excessive pressure rise in 2A, 22B, 22C. The elastic force of the tongue pieces 23, 24 acting in the restoring direction in the open state may be small. The reason is that the back surface of the discharge port 20 on which the liquid pressure acts and the contraction chamber 22A facing the back surface of the discharge port 20 in the open state. , 22B, 22C have the same area as the surface on which the liquid pressure acts.

【００１３】そして、吸入ポート１６より吸入室１５に
吸入する液体の吸入速度が速く絞り１８により液体が絞
り制御される所定値以上の高回転域になると、この絞り
制御により駆動軸１３の回転数上昇に伴う吸入量の増加
を抑制し、これに起因して回転数上昇に伴う吐出量の増
加を抑制する。このとき、吸入室１５に液体が十分に吸
入されないため液体中に気ほうを生じ、この気ほうが液
体とともに最大容積室１４を経て収縮室２２Ａ、２２
Ｂ、２２Ｃに搬送され、収縮室２２Ａ、２２Ｂ、２２Ｃ
の液体圧力は気ほうにより許容値まで低下し、舌片部２
３、２４は図２に一点鎖線で示す開状態より復元方向に
作用する自己の僅少な弾性力で瞬時に閉作動し、収縮室
２２Ａ、２２Ｂ、２２Ｃ内の気ほうは収縮室２２Ａ、２
２Ｂ、２２Ｃの容積減少に伴い滑らかに消去されキャビ
テーションに伴う騒音等生じないようにしている。そし
て、舌片部２３、２４はその閉状態では復元方向に作用
する自己の弾性力を有しなくなる。When the suction speed of the liquid sucked into the suction chamber 15 from the suction port 16 is high and the rotation speed of the drive shaft 13 is higher than a predetermined value in which the liquid is throttle-controlled by the throttle 18, the rotation speed of the drive shaft 13 is controlled by the throttle control. This suppresses an increase in the suction amount due to the increase, and thereby suppresses an increase in the discharge amount due to the increase in the rotation speed. At this time, since the liquid is not sufficiently sucked into the suction chamber 15, bubbles are generated in the liquid, and this bubble passes through the maximum volume chamber 14 together with the liquid and then contracts chambers 22A, 22A.
B, 22C, and contraction chambers 22A, 22B, 22C
The liquid pressure of the tongue piece 2 drops to an allowable value due to the air bubble.
3, 24 are instantly closed by their own small elastic force acting in the restoring direction from the open state shown by the one-dot chain line in FIG. 2, and the bubbles in the contraction chambers 22A, 22B, 22C are contracted into the contraction chambers 22A, 2A, 2C.
As the volume of 2B and 22C is reduced, the data is smoothly erased so that noise due to cavitation does not occur. Then, the tongue pieces 23, 24 do not have their own elastic force acting in the restoring direction in the closed state.

【００１４】この作動で、薄板部材６、７に形成して根
元２３Ａ、２４Ａを中心に傾動して開作動する舌片部２
３、２４はその開状態で復元方向に作用する自己の弾性
力により閉作動するから、従来のポンプの如く、逆止弁
を閉方向へ付勢する複数の弾性部材やこの弾性部材を収
装するよう本体に形成した孔を不要にでき、駆動軸１３
の低回転域における収縮室２２Ａ、２２Ｂ、２２Ｃの過
剰な圧力上昇を防止する構成を簡単にできて、高回転域
における駆動軸１３の回転数上昇に伴う吐出量の増加を
良好に抑制することができる。また、舌片部２３、２４
は根元２３Ａ、２４Ａを中心に傾動して開作動するた
め、その開度量に伴う収縮室２２Ａ、２２Ｂ、２２Ｃか
ら吐出ポート２０への液体の流出量を最大容積室１４側
から吐出室１９側に向けて適正に漸次増加することがで
き、収縮室２２Ａ、２２Ｂ、２２Ｃの過剰な圧力上昇の
防止を収縮室２２Ａ、２２Ｂ、２２Ｃの容積減少率に対
応して良好に得ることができる。By this operation, the tongue portion 2 which is formed on the thin plate members 6 and 7 and is tilted about the roots 23A and 24A to be opened.
Since 3, 24 are closed by their own elastic force acting in the restoring direction in the open state, a plurality of elastic members for urging the check valve in the closing direction and the elastic members are housed like a conventional pump. The hole formed in the main body can be eliminated and the drive shaft 13
The structure for preventing the excessive pressure rise of the contraction chambers 22A, 22B, 22C in the low rotation range can be simplified, and the increase in the discharge amount due to the increase in the rotation speed of the drive shaft 13 in the high rotation range can be properly suppressed. You can Also, the tongue pieces 23, 24
Is tilted about the roots 23A, 24A to perform the opening operation, so that the amount of liquid flowing out from the contraction chambers 22A, 22B, 22C to the discharge port 20 depending on the opening amount is changed from the maximum volume chamber 14 side to the discharge chamber 19 side. It is possible to appropriately gradually increase the pressure toward the contraction chambers 22A, 22B, and 22C, and to prevent the excessive increase in pressure in the contraction chambers 22A, 22B, and 22C in accordance with the volume reduction rate of the contraction chambers 22A, 22B, and 22C.

【００１５】図３は本発明の他実施例を示し、一実施例
と同一個所には同符号を付して説明を省略し、異なる個
所についてのみ説明する。２５は１１枚の内歯２５Ａを
有した内歯歯車、２６は９枚の外歯２６Ａを有した外歯
歯車で、両歯車２５、２６は本体１に有したリング部材
５の内孔１１に、内接噛合するよう偏心して回転自在に
設けており、この両歯車２５、２６の歯２５Ａ、２６Ａ
が最深に噛合う位置との対向側には内歯２５Ａと外歯２
６Ａとの各歯先が摺接するよう略三日月状の仕切片２７
を固定配置して設けている。２８Ａは仕切片２７の外側
面２７Ａと内歯歯車２５の隣接する両内歯２５Ａに囲ま
れて区画形成の閉塞した室、２８Ｂは仕切片２７の内側
面２７Ｂと外歯歯車２６の隣接する両外歯２６Ａに囲ま
れて区画形成の閉塞した室で、この室２８Ａと２８Ｂと
により最大容積室２９を構成している。３０は吸入ポー
トで、仕切片２７側の先端部を仕切片２７の端部を跨ぐ
形状に形成し、両歯車２５、２６の回転方向Ｅにおける
最も後側に構成される最大容積室２９に連通するよう設
けている。そして、両歯車２５、２６の回転方向Ｅにお
ける仕切片２７の端部より２個の収縮室３１Ａ、３１Ｂ
および吐出室３２を内歯２５Ａと外歯２６Ａとでそれぞ
れ区画形成している。そして、収縮室３１Ａ、３１Ｂの
液体圧力が許容値より上昇したとき収縮室３１Ａ、３１
Ｂの液体を吐出ポート３３へ流出自在に両歯車２５、２
６の軸方向両側に舌片部３４を薄板部材に形成して設け
ている。FIG. 3 shows another embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described. Reference numeral 25 is an internal gear having 11 internal teeth 25A, 26 is an external gear having 9 external teeth 26A, and both gears 25, 26 are provided in the internal hole 11 of the ring member 5 provided in the main body 1. , The teeth 25A and 26A of both gears 25 and 26 are eccentrically rotatably provided so as to be inscribed in mesh.
The inner teeth 25A and the outer teeth 2 on the side opposite to the position where the deepest meshes.
6A of crescent-shaped partition 27 so that each tooth tip is in sliding contact with 6A
Are fixedly arranged. 28A is a chamber that is enclosed by the outer surface 27A of the partition 27 and both adjacent inner teeth 25A of the internal gear 25 and is closed to form a partition, and 28B is the inner surface 27B of the partition 27 and both adjacent teeth of the external gear 26. The chamber is surrounded by the outer teeth 26A and is closed to form a partition, and the chambers 28A and 28B form a maximum volume chamber 29. Reference numeral 30 denotes an intake port, which is formed such that a tip end thereof on the partition 27 side straddles an end of the partition 27 and communicates with a maximum volume chamber 29 formed on the rearmost side in the rotation direction E of both gears 25 and 26. It is provided to do so. Then, two contraction chambers 31A, 31B from the end of the partition 27 in the rotation direction E of both gears 25, 26.
Further, the discharge chamber 32 is divided and formed by the inner teeth 25A and the outer teeth 26A. When the liquid pressure in the contraction chambers 31A, 31B rises above the allowable value, the contraction chambers 31A, 31B
Both gears 25, 2 so that the liquid B can freely flow out to the discharge port 33
Tongue pieces 34 are formed as thin plate members on both sides in the axial direction of 6.

【００１６】この構成において、駆動軸１３により外歯
歯車２６を回転方向Ｅに回転駆動すると、両歯車２５、
２６がともに同方向に回転して吸入流路１７の液体を吸
入ポート３０より吸入室１５に吸入し、この液体を仕切
片２７の内外側に形成される室２８Ａ、２８Ｂすなわち
最大容積室２９、収縮室３１Ａ、３１Ｂを経て吐出室３
２に搬送し吐出ポート３３より吐出流路２１に吐出す
る。そして、駆動軸１３の回転数が液体の絞り制御が機
能しない所定値以下の低回転域では、吐出量が回転数上
昇に略比例して増加する。このとき、収縮室３１Ａ，３
１Ｂの容積減少により内部の液体圧力が許容値より上昇
し舌片部３４が根元３４Ａを中心に傾動して開作動し、
収縮室３１Ａ、３１Ｂに満たされている液体の一部が吐
出ポート３３に流出され、収縮室３１Ａ、３１Ｂの過剰
な圧力上昇を防止する。また、駆動軸１３の回転数上昇
で液体が絞り制御される所定値以上の高回転域になる
と、回転数上昇に伴う吸入量の増加を抑制して吐出量の
増加を抑制し、吸入量の抑制により吸入室１５の液体中
に生じる気ほうが最大容積室２９を経て収縮室３１Ａ、
３１Ｂに搬送され、収縮室３１Ａ、３１Ｂの液体圧力が
気ほうにより許容値まで低下して舌片部３４が開状態よ
り復元方向に作用する僅少な自己の弾性力で瞬時に閉作
動し、収縮室３１Ａ、３１Ｂ内の気ほうは収縮室３１
Ａ、３１Ｂの容積減少に伴い滑らかに消去されキャビテ
ーションに伴う騒音等を生じないようにしている。この
ため、一実施例と同様の作用効果を得ることができる。In this configuration, when the external gear 26 is rotationally driven in the rotational direction E by the drive shaft 13, both gears 25,
26 both rotate in the same direction to suck the liquid in the suction flow passage 17 into the suction chamber 15 through the suction port 30, and store the liquid in the chambers 28A and 28B formed inside and outside the partition 27, that is, the maximum volume chamber 29, Discharge chamber 3 through contraction chambers 31A and 31B
The sheet is conveyed to the discharge passage 33 and discharged from the discharge port 33 to the discharge passage 21. Then, in a low rotation range where the rotation speed of the drive shaft 13 is equal to or lower than a predetermined value at which the diaphragm control of the liquid does not function, the discharge amount increases substantially in proportion to the increase in the rotation speed. At this time, the contraction chambers 31A, 3
Due to the volume decrease of 1B, the internal liquid pressure rises above the allowable value and the tongue portion 34 tilts around the root 34A to perform the opening operation.
A part of the liquid filled in the contraction chambers 31A and 31B flows out to the discharge port 33 to prevent an excessive increase in pressure in the contraction chambers 31A and 31B. In addition, when the rotation speed of the drive shaft 13 increases and the liquid reaches a high rotation range of a predetermined value or more where the liquid is throttle-controlled, the increase in the suction amount is suppressed and the increase in the discharge amount is suppressed. The bubbles generated in the liquid in the suction chamber 15 due to the suppression pass through the maximum volume chamber 29, the contraction chamber 31A,
31B, the liquid pressure in the contraction chambers 31A and 31B drops to an allowable value due to air bubbles, and the tongue piece 34 instantly closes and contracts due to its own small elastic force acting in the restoring direction from the open state. The bubbles in the chambers 31A and 31B are the contraction chamber 31.
As the volumes of A and 31B are reduced, they are smoothly erased so that noise and the like due to cavitation do not occur. Therefore, it is possible to obtain the same effect as that of the first embodiment.

【００１７】なお、本実施例では薄板部材６、７を両歯
車１０、１２もしくは２５、２６の軸方向両側面に摺接
して設け、薄板部材６、７に舌片部２３、２４もしくは
３４を形成したが、舌片部を形成した１個の薄板部材を
両歯車の軸方向一側面に摺接して設けても良いことは勿
論である。In this embodiment, the thin plate members 6 and 7 are provided in sliding contact with both axial side surfaces of both gears 10, 12 or 25 and 26, and the thin plate members 6 and 7 are provided with tongue pieces 23, 24 or 34. Although it is formed, it goes without saying that one thin plate member having a tongue piece may be provided in sliding contact with one axial side surface of both gears.

【００１８】[0018]

【発明の効果】このように本発明は、複数の外歯を有し
て駆動軸により回転駆動される外歯歯車と、外歯より多
数の内歯を有する内歯歯車とを内接噛合するよう本体内
に偏心して回転自在に設け、この両歯車の軸方向側面と
摺接する薄板状の薄板部材を本体内に固設して設け、両
歯車の歯が最深に噛合う位置との対向側に閉塞した最大
容積室を区画形成し、最大容積室より両歯車の回転方向
における後側に液体を吸入する吸入ポートに連通の吸入
室を区画形成すると共に、最大容積室より両歯車の回転
方向における先側に液体を吐出する吐出ポートに連通の
吐出室を区画形成し、かつ最大容積室と吐出室との間に
両歯車の回転に伴いその容積を減少する収縮室を区画形
成して成し、外歯歯車を回転駆動する駆動軸の回転数が
所定値以上に上昇すると駆動軸の回転数上昇に伴う吸入
量の増加を抑制するよう吸入ポート側を絞り制御して設
け、両歯車の軸方向側面が摺接して本体内に固設した薄
板部材には収縮室の液体圧力が許容値より上昇したとき
開作動してその液体を吐出ポート側へ流出自在に舌片部
を形成し、舌片部は収縮室の最大容積室側を根元にして
吐出室側を先端にする片持ち支持に設けてその開状態で
復元方向に作用する自己の弾性力を有して成ることによ
り、従来のポンプの如く、逆止弁を閉方向へ付勢する複
数の弾性部材やこの弾性部材を収装するよう本体に形成
した孔を不要にでき、駆動軸の低回転域における収縮室
の過剰な圧力上昇を防止する構成を簡単にできて、高回
転域における駆動軸の回転数上昇に伴う吐出量の増加を
良好に抑制することができる。また、薄板部材に形成し
た舌片部は最大容積室側の根元を中心に傾動して開作動
するため、その開度量に伴う収縮室から吐出ポート側へ
の液体の流出量を最大容積室側から吐出室側に向けて適
正に漸次増加することができ、収縮室の過剰な圧力上昇
の防止を収縮室の容積減少率に対応して良好に得ること
ができて、特に、車両用のポンプとして好適である効果
を有する。As described above, according to the present invention, an external gear having a plurality of external teeth and rotationally driven by a drive shaft is internally meshed with an internal gear having a larger number of internal teeth than the external teeth. The eccentric rotatably provided in the main body, and the thin plate-like thin plate member slidingly contacting the axial side surfaces of both gears is fixedly provided in the main body, and the side opposite to the position where the teeth of both gears mesh deeply The maximum volume chamber is closed to form a partition, and the suction chamber communicating with the suction port that sucks liquid is defined to the rear side of the maximum volume chamber in the rotation direction of both gears, and the rotation direction of both gears from the maximum volume chamber is defined. A discharge chamber that communicates with the discharge port that discharges the liquid is defined on the front side of the chamber, and a contraction chamber that reduces its volume as the two gears rotate is defined between the maximum volume chamber and the discharge chamber. Then, the rotation speed of the drive shaft that drives the external gear to rotate rises above the specified value. Then, the suction port side is controlled by throttling so as to suppress the increase in the intake amount due to the increase in the rotation speed of the drive shaft, and the contraction chamber is provided in the thin plate member fixed in the main body with the axial side surfaces of both gears slidingly contacting each other. When the liquid pressure rises above the permissible value, it opens to form a tongue piece that allows the liquid to flow out to the discharge port side.The tongue piece is located at the discharge chamber side with the maximum volume chamber side of the contraction chamber as the root. A plurality of elastic members for urging the check valve in the closing direction like a conventional pump by being provided on the cantilever support at the tip and having its own elastic force acting in the restoring direction in the open state. The hole formed in the main body for accommodating the elastic member or the elastic member can be dispensed with, and the structure for preventing an excessive pressure rise in the contraction chamber in the low rotation range of the drive shaft can be simplified, and the drive shaft in the high rotation range can be It is possible to satisfactorily suppress the increase in the discharge amount due to the increase in the rotation speed. Further, since the tongue portion formed on the thin plate member is tilted about the root of the maximum volume chamber side to perform the opening operation, the outflow amount of the liquid from the contraction chamber to the discharge port side due to the opening amount is changed to the maximum volume chamber side. From the discharge chamber to the discharge chamber side, the excessive increase in pressure in the contraction chamber can be prevented satisfactorily in accordance with the volume decrease rate of the contraction chamber. Has an effect that is suitable as.

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

【図１】本発明の一実施例を示し、（Ａ）は内接歯車ポ
ンプの縦断面図、（Ｂ）は（Ａ）の線Ｃ−Ｃに沿った断
面図である。1 shows an embodiment of the present invention, (A) is a longitudinal sectional view of an internal gear pump, (B) is a sectional view taken along line C-C of (A).

【図２】図１の（Ａ）の線Ｄ−Ｄに沿った部分拡大断面
図である。FIG. 2 is a partially enlarged cross-sectional view taken along the line DD of FIG.

【図３】本発明の他実施例を示した内接歯車ポンプの縦
断面図である。FIG. 3 is a longitudinal sectional view of an internal gear pump showing another embodiment of the present invention.

【図４】従来例を示す内接歯車ポンプの縦断面図であ
る。FIG. 4 is a vertical sectional view of an internal gear pump showing a conventional example.

【図５】図４の線Ｆ−Ｆに沿った断面図である。5 is a cross-sectional view taken along the line FF of FIG.

【図６】図４の線Ｇ−Ｇに沿った部分断面図である。6 is a partial cross-sectional view taken along the line GG of FIG.

【符号の説明】[Explanation of symbols]

１本体 ６、７薄板部材 １０、２５内歯歯車 １２、２６外歯歯車 １０Ａ、２５Ａ内歯 １２Ａ、２６Ａ外歯 １３駆動軸 １４、２９最大容積室 １５吸入室 １６、３０吸入ポート １９、３２吐出室 ２０、３３吐出ポート ２２Ａ、２２Ｂ、２２Ｃ、３１Ａ、３１Ｂ収縮室 ２３、２４、３４舌片部 ２３Ａ、２４Ａ、３４Ａ根元 1 main body 6, 7 thin plate member 10, 25 internal gear 12, 26 external gear 10A, 25A internal tooth 12A, 26A external tooth 13 drive shaft 14, 29 maximum volume chamber 15 suction chamber 16, 30 suction port 19, 32 discharge Chamber 20, 33 Discharge port 22A, 22B, 22C, 31A, 31B Contraction chamber 23, 24, 34 Tongue portion 23A, 24A, 34A Root

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 複数の外歯を有して駆動軸により回転駆
動される外歯歯車と、外歯より多数の内歯を有する内歯
歯車とを内接噛合するよう本体内に偏心して回転自在に
設け、この両歯車の軸方向側面と摺接する薄板状の薄板
部材を本体内に固設して設け、両歯車の歯が最深に噛合
う位置との対向側に閉塞した最大容積室を区画形成し、
最大容積室より両歯車の回転方向における後側に液体を
吸入する吸入ポートに連通の吸入室を区画形成すると共
に、最大容積室より両歯車の回転方向における先側に液
体を吐出する吐出ポートに連通の吐出室を区画形成し、
かつ最大容積室と吐出室との間に両歯車の回転に伴いそ
の容積を減少する収縮室を区画形成して成し、外歯歯車
を回転駆動する駆動軸の回転数が所定値以上に上昇する
と駆動軸の回転数上昇に伴う吸入量の増加を抑制するよ
う吸入ポート側を絞り制御して設け、両歯車の軸方向側
面が摺接して本体内に固設した薄板部材には収縮室の液
体圧力が許容値より上昇したとき開作動してその液体を
吐出ポート側へ流出自在に舌片部を形成し、舌片部は収
縮室の最大容積室側を根元にして吐出室側を先端にする
片持ち支持に設けてその開状態で復元方向に作用する自
己の弾性力を有して成ることを特徴とする内接歯車ポン
プ。1. An eccentric rotation in a main body so that an external gear having a plurality of external teeth and rotationally driven by a drive shaft and an internal gear having a larger number of internal teeth than the external teeth are internally eccentrically engaged with each other. A thin plate-like thin plate member that is freely provided and slidably contacts the axial side surfaces of both gears is fixedly provided in the main body, and the maximum volume chamber closed on the opposite side to the position where the teeth of both gears mesh deeply is provided. Partitioning,
A suction chamber that communicates with the suction port that sucks liquid behind the maximum volume chamber in the rotation direction of both gears is defined, and a discharge port that discharges liquid to the front side of the maximum volume chamber in the rotation direction of both gears. The discharge chamber of the communication is divided and formed,
In addition, a contraction chamber is formed between the maximum volume chamber and the discharge chamber to reduce the volume of the gears as the gears rotate, and the rotational speed of the drive shaft that drives the external gear increases. Then, the suction port side is controlled by throttling so as to suppress the increase in the suction amount due to the increase in the rotation speed of the drive shaft, and the axial side surfaces of both gears are brought into sliding contact with each other so that the thin plate member fixed in the main body has the contraction chamber When the liquid pressure rises above the permissible value, it opens to form a tongue piece so that the liquid can flow out to the discharge port side.The tongue piece part is the discharge chamber side with the maximum volume chamber side of the contraction chamber as the root. An internal gear pump having a self-supporting elastic force which is provided on the cantilever support and acts in the restoring direction in the open state.