JPH09296716A - Oil pump - Google Patents
Oil pumpInfo
- Publication number
- JPH09296716A JPH09296716A JP8132798A JP13279896A JPH09296716A JP H09296716 A JPH09296716 A JP H09296716A JP 8132798 A JP8132798 A JP 8132798A JP 13279896 A JP13279896 A JP 13279896A JP H09296716 A JPH09296716 A JP H09296716A
- Authority
- JP
- Japan
- Prior art keywords
- oil pump
- pump
- rotor
- outer rotor
- teeth
- 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.)
- Pending
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
-
- 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
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はオイルポンプに係
り、特にオイルポンプの駆動時に、連通手段によって隣
接する２つのポンプ室を連通させ、ポンプ室内の急激な
圧力変動を緩和し、キャビテーションや液体ハンマを防
止し得るとともに、オイルポンプの効率の低下を抑制し
得るトロコイド式のオイルポンプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump, and particularly when the oil pump is driven, two adjacent pump chambers are connected by a communication means to reduce a sudden pressure fluctuation in the pump chamber and to prevent cavitation and liquid hammer. The present invention relates to a trochoidal oil pump capable of preventing the above-mentioned problem and suppressing a decrease in efficiency of the oil pump.
【０００２】[0002]
【従来の技術】従来のオイルポンプにおいては、ドライ
ビングギヤとドリブンギヤとの噛合によってオイルを圧
送するギヤ式ポンプや、インナロータとアウタロータと
を有するトロコイドポンプ等がある。2. Description of the Related Art Conventional oil pumps include a gear type pump that pumps oil by engagement of a driving gear and a driven gear, and a trochoid pump having an inner rotor and an outer rotor.
【０００３】このトロコイドポンプ、例えばトロコイド
式のオイルポンプ１０２は、図３に示す如く、オイルポ
ンプケース１０４の収容部１０４ａ内にアウタロータ１
０６とインナロータ１１２とを収容し、ロータカバー
（図示せず）にて脱落を防止すべく装着されている。ま
た、オイルポンプ１０２は、トロコイド曲線によって形
成されたインナロータ１１２のインナ側歯部（図示せ
ず）とアウタロータ１０６のアウタ側歯部（図示せず）
とを噛合し、夫々軸心を異ならしめてオイルポンプケー
ス１０４内に組み込まれている。As shown in FIG. 3, this trochoid pump, for example, a trochoid type oil pump 102 has an outer rotor 1 in an accommodating portion 104a of an oil pump case 104.
06 and the inner rotor 112 are housed, and are mounted by a rotor cover (not shown) to prevent them from falling off. Further, the oil pump 102 includes inner tooth portions (not shown) of the inner rotor 112 and outer tooth portions (not shown) of the outer rotor 106, which are formed by trochoidal curves.
Are engaged with each other and the axes thereof are different from each other, and they are incorporated in the oil pump case 104.
【０００４】更に、前記インナロータ１１２のインナ側
歯部の歯数が前記アウタロータ１０６のアウタ側歯部の
歯数よりも１個少なく構成され、前記インナロータ１１
２を回転することにより、アウタロータ１０６がインナ
ロータ１１２と同一回転し、このインナロータ１１２の
インナ側歯部とアウタロータ１０６のアウタ側歯部とに
よって形成されるポンプ室１１４が容量変化をしてポン
プ作用を行うものである。Further, the number of teeth on the inner side tooth portion of the inner rotor 112 is smaller than the number of teeth on the outer side tooth portion of the outer rotor 106 by one.
By rotating 2, the outer rotor 106 rotates in the same manner as the inner rotor 112, and the pump chamber 114 formed by the inner side tooth portion of the inner rotor 112 and the outer side tooth portion of the outer rotor 106 changes its capacity to perform pumping action. It is something to do.
【０００５】このようなオイルポンプ１０２は、オイル
を吸込ポート１１６から吐出ポート１１８側に吐出する
ものであり、同容量の他種オイルポンプに比し、小型で
構造も簡単であり、また、噛合音も小さいので、車両の
潤滑用ポンプやトランスミッション用オイルポンプ等と
して広範囲に利用されている。The oil pump 102 as described above discharges oil from the suction port 116 to the discharge port 118 side, and is smaller in size and simpler in structure and meshes with other types of oil pumps of the same capacity. Because of its low noise, it is widely used as a vehicle lubrication pump, a transmission oil pump, and the like.
【０００６】前記オイルポンプとしては、特開平７−１
０２９２８号公報に開示されるものがある。この公報に
開示されるオイルポンプの構造は、オイルポンプの吐出
ポートをオイルポンプケース側に設けるとともに、吐出
ポートに対して早期ポンプ室に連絡するサブ吐出ポート
をロータカバー側に設け、またオイルポンプのアウタロ
ータとインナロータとのいずれか一方の回転方向前側部
位にポンプ室に連通するポンプ室を設け、更にオイルポ
ンプのアウタロータ及びインナロータを覆うオイルポン
プケースを設け、オイルポンプケースの隔壁内に吐出ポ
ートに連絡する連絡通路を設け、吐出ポートからポンプ
室へのオイルの逆流を防止し、ウォータハンマ現象の発
生を回避するとともに、騒音を低減させている。An example of the oil pump is Japanese Patent Laid-Open No. 7-1.
There is one disclosed in Japanese Patent No. 02928. The structure of the oil pump disclosed in this publication is such that the discharge port of the oil pump is provided on the oil pump case side, and the sub-discharge port that connects the discharge port to the early pump chamber is provided on the rotor cover side. A pump chamber that communicates with the pump chamber is provided at the front side in the direction of rotation of either the outer rotor or the inner rotor, and an oil pump case that covers the outer rotor and the inner rotor of the oil pump is provided. A communication passage for communication is provided to prevent the reverse flow of oil from the discharge port to the pump chamber, prevent the occurrence of the water hammer phenomenon, and reduce noise.
【０００７】[0007]
【発明が解決しようとする課題】ところで、図３に示す
如く、従来のオイルポンプ１０２において、前記ポンプ
室１１４の容積は、吸込側で増大し且つ吐出側では減少
するため、吸込側から吐出側にかけての密封空間Ａにあ
るポンプ室１１４内では、急激な減圧と加圧とが行われ
る。このため、オイルに含まれる気体が気泡化してキャ
ビテーションが発生するとともに、ポンプ室１１４が吐
出側と連通する際に、吐出側の高圧オイルがポンプ室１
１４内に逆流して液体ハンマが起こり、キャビテーショ
ンや液体ハンマによって激しい騒音や振動が惹起される
という不都合がある。By the way, as shown in FIG. 3, in the conventional oil pump 102, the volume of the pump chamber 114 increases on the suction side and decreases on the discharge side. Therefore, from the suction side to the discharge side. Rapid depressurization and pressurization are performed in the pump chamber 114 in the sealed space A over the period. Therefore, the gas contained in the oil is bubbled to cause cavitation, and when the pump chamber 114 communicates with the discharge side, the high pressure oil on the discharge side is pumped by the pump chamber 1.
There is an inconvenience that a liquid hammer is generated by backflowing into the inside of 14, and cavitation and liquid hammer cause intense noise and vibration.
【０００８】従来、この不都合を回避する２つの方策が
ある。Conventionally, there are two measures to avoid this inconvenience.
【０００９】第１の方策は、図４及び図５に示す如く、
オイルポンプ２０２のインナロータ２１２において、全
てのインナ側歯部２１０側面に溝部２３２を形成するも
のである。The first measure is, as shown in FIGS. 4 and 5,
In the inner rotor 212 of the oil pump 202, the groove portions 232 are formed on the side surfaces of all the inner tooth portions 210.
【００１０】そして、密封空間にあるポンプ室２１４と
吐出側に連通しているポンプ室２１４とを溝部２３２に
よって常時連通させ、密封空間にあるオイルを徐々に吐
出側へ吐出し、ポンプ室２１４内の急激な圧力変動を緩
和させて振動・騒音を低減させている（特公昭６３−４
７９１３号公報参照）。The pump chamber 214 in the sealed space and the pump chamber 214 communicating with the discharge side are constantly communicated with each other by the groove portion 232, and the oil in the sealed space is gradually discharged to the discharge side. Vibration and noise are reduced by mitigating the sudden pressure fluctuation of
7913).
【００１１】また、第２の方策は、第１の方策における
溝部２３２の代わりに、図６及び図７に示す如く、オイ
ルポンプ３０２のインナロータ３１２において、全ての
インナ側歯部３１０側面に面取り部３３２を形成してい
る。この面取り部３３２においても、上述の第１の方策
の如く、ポンプ室３１４内の急激な圧力変動を緩和させ
て振動・騒音を低減させている。In the second measure, instead of the groove portion 232 in the first measure, as shown in FIGS. 6 and 7, in the inner rotor 312 of the oil pump 302, chamfered portions are formed on all the inner side tooth portions 310 side surfaces. 332 is formed. Also in this chamfered portion 332, as in the above-mentioned first measure, the sudden pressure fluctuation in the pump chamber 314 is alleviated to reduce the vibration and noise.
【００１２】しかし、上述の第１及び第２の方策に開示
される如く、オイルポンプのインナロータの全てのイン
ナ側歯部側面に溝部や面取り部を形成することは、オイ
ルポンプの吐出側と吸込側とが常時連通していることで
あり、オイルポンプの効率を低下させることとなり、こ
の効率の低下を補うためには、オイルポンプを大型化す
る必要があり、メカロスの増大につながるという不都合
がある。However, as disclosed in the above-mentioned first and second measures, forming grooves and chamfers on all the inner tooth side surfaces of the inner rotor of the oil pump is not effective for the discharge side and suction side of the oil pump. Since it is in continuous communication with the side, the efficiency of the oil pump is reduced, and in order to compensate for this reduction in efficiency, it is necessary to upsize the oil pump, which leads to an increase in mechanical loss. is there.
【００１３】[0013]
【課題を解決するための手段】そこで、この発明は、上
述不都合を除去するために、オイルポンプケースに複数
の歯数を有するアウタロータとこのアウタロータよりも
１枚少ない歯数を有するインナロータとを収容して設け
るとともに前記アウタロータとインナロータとによって
形成されるポンプ室に連通する吸込ポートと吐出ポート
とを夫々設けたオイルポンプにおいて、前記アウタロー
タとインナロータとの偶数の歯数を有するいずれか一方
のロータの歯先部位には、前記ポンプ室が吸込側あるい
は吐出側のいずれか一方の隣接するポンプ室に連通すべ
く１歯飛びに連通手段を設けたことを特徴とする。Therefore, in order to eliminate the above-mentioned inconvenience, the present invention accommodates an outer rotor having a plurality of teeth in an oil pump case and an inner rotor having a number of teeth one less than that of the outer rotor. In an oil pump provided with a suction port and a discharge port that communicate with the pump chamber formed by the outer rotor and the inner rotor, respectively, one of the rotors having an even number of teeth of the outer rotor and the inner rotor The tooth tip portion is characterized in that the pump chamber is provided with a communicating means for every one tooth in order to communicate with the adjacent pump chamber on either the suction side or the discharge side.
【００１４】[0014]
【発明の実施の形態】上述の如く発明したことにより、
オイルポンプを駆動した際には、オイルポンプケース内
のアウタロータとインナロータ間に閉込みの完了によっ
てポンプ室が形成され、ポンプ作用によってポンプ室内
の圧力が上昇するが、連通手段によって隣接する２つの
ポンプ室が連通することとなり、ポンプ室内の急激な圧
力変動を緩和し、キャビテーションや液体ハンマを防止
するとともに、オイルポンプの効率の低下を抑制してい
る。BEST MODE FOR CARRYING OUT THE INVENTION
When the oil pump is driven, the pump chamber is formed between the outer rotor and the inner rotor in the oil pump case due to the completion of the closing, and the pressure in the pump chamber rises due to the pump action. By connecting the chambers, rapid pressure fluctuations in the pump chamber are alleviated, cavitation and liquid hammer are prevented, and the efficiency of the oil pump is prevented from decreasing.
【００１５】[0015]
【実施例】以下図面に基づいてこの発明の実施例を詳細
に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.
【００１６】図１及び図２はこの発明の実施例を示すも
のである。図２において、２は高圧の容量型であるトロ
コイド式のオイルポンプである。FIGS. 1 and 2 show an embodiment of the present invention. In FIG. 2, 2 is a trochoidal type oil pump which is a high pressure displacement type.
【００１７】このオイルポンプ２は、図示しない取付部
に取り付けられるオイルポンプケース４と、このオイル
ポンプケース４に設けられた収容部４ａに回転可能に装
着されたアウタロータ６と、アウタロータ６のアウタ側
歯部８にインナ側歯部１０を噛合させて駆動軸（図示せ
ず）により回転駆動されるインナロータ１２とを有して
いる。The oil pump 2 includes an oil pump case 4 attached to a mounting portion (not shown), an outer rotor 6 rotatably attached to a housing portion 4a provided in the oil pump case 4, and an outer side of the outer rotor 6. The inner tooth portion 10 is meshed with the tooth portion 8 and the inner rotor 12 is rotationally driven by a drive shaft (not shown).
【００１８】このとき、前記アウタロータ６の歯数を奇
数の７枚とするとともに、インナロータ１２の歯数を、
アウタロータ６よりも１枚少ない６枚とする。At this time, the number of teeth of the outer rotor 6 is set to an odd number of 7, and the number of teeth of the inner rotor 12 is
The number of sheets is one, which is one less than the outer rotor 6.
【００１９】前記オイルポンプケース４には、アウタロ
ータ６のアウタ側歯部８とインナロータ１２のインナ側
歯部１０とにより回転方向に拡縮しつつ移動して形成さ
れるポンプ室１４に連通する吸込ポート１６と吐出ポー
ト１８とが夫々形成されている。The oil pump case 4 has a suction port communicating with a pump chamber 14 formed by the outer side tooth portion 8 of the outer rotor 6 and the inner side tooth portion 10 of the inner rotor 12 which expands and contracts in the rotational direction. 16 and a discharge port 18 are formed respectively.
【００２０】そして、前記アウタロータ６とインナロー
タ１２との偶数の歯数を有するいずれか一方のロータ、
例えばインナロータ１２の歯先部位に、前記ポンプ室１
４が吸込側あるいは吐出側のいずれか一方の隣接するポ
ンプ室１４に連通すべく１歯飛びに連通手段２０を設け
る構成とする。Any one of the outer rotor 6 and the inner rotor 12 having an even number of teeth,
For example, at the tooth tip portion of the inner rotor 12, the pump chamber 1
The communication means 20 is provided for every one tooth jump so that 4 communicates with the adjacent pump chamber 14 on either the suction side or the discharge side.
【００２１】詳述すれば、図１に示す如く、前記インナ
ロータ１２の歯先部位に、１歯飛びに連通手段２０、例
えば面取り部２２を形成し、この面取り部２２によって
前記ポンプ室１４が吸込側あるいは吐出側のいずれか一
方の隣接するポンプ室１４に連通させるものである。More specifically, as shown in FIG. 1, a communicating means 20, for example, a chamfered portion 22 is formed in a tooth tip portion of the inner rotor 12 at intervals of one tooth, and the chamfered portion 22 sucks the pump chamber 14 into the suction chamber. The pump chamber 14 is connected to the adjacent pump chamber 14 on either the discharge side or the discharge side.
【００２２】また、前記面取り部２２は、図１に示す如
く、インナロータ１２のインナ側歯部１０の先端部位に
おいて、１歯飛びに、例えば第１、第３、第５インナ側
歯部１０−１、１０−３、１０−５の夫々の側面に形成
し、第２、第４、第６インナ側歯部１０−２、１０−
４、１０−６の夫々の側面には、面取り部２２を形成し
ない。Further, as shown in FIG. 1, the chamfered portion 22 is provided at the tip end portion of the inner tooth portion 10 of the inner rotor 12 in steps of one tooth, for example, the first, third and fifth inner tooth portions 10-. The second, fourth, and sixth inner tooth portions 10-2, 10- are formed on the respective side surfaces of 1, 10-3, 10-5.
The chamfered portion 22 is not formed on each side surface of Nos. 4, 10-6.
【００２３】次に作用について説明する。Next, the operation will be described.
【００２４】前記オイルポンプ２を駆動すると、オイル
ポンプケース４内のアウタロータ６とインナロータ１２
間に閉込みの完了によってポンプ室１４が形成され、ポ
ンプ作用によってポンプ室１４内の圧力が上昇する。When the oil pump 2 is driven, the outer rotor 6 and the inner rotor 12 in the oil pump case 4 are driven.
The pump chamber 14 is formed by the completion of the closing, and the pressure in the pump chamber 14 increases due to the pump action.
【００２５】そしてこのとき、前記面取り部２２によっ
て隣接する２つのポンプ室１４が連通することとなり、
ポンプ室１４内の急激な圧力変動が緩和される。At this time, two adjacent pump chambers 14 communicate with each other by the chamfered portion 22,
Rapid pressure fluctuations in the pump chamber 14 are reduced.
【００２６】これにより、前記アウタロータ６とインナ
ロータ１２との偶数の歯数を有するいずれか一方のロー
タ、例えばインナロータ１２の歯先部位に、前記ポンプ
室１４が吸込側あるいは吐出側のいずれか一方の隣接す
るポンプ室１４に連通すべく１歯飛びに連通手段２０を
設けることにより、ポンプ室１４内の急激な圧力変動を
緩和することができ、キャビテーションや液体ハンマを
防止し得る。As a result, at one of the rotors having an even number of teeth of the outer rotor 6 and the inner rotor 12, for example, at the tooth tip portion of the inner rotor 12, the pump chamber 14 is provided on either the suction side or the discharge side. By providing the communicating means 20 for every one tooth jump so as to communicate with the adjacent pump chambers 14, it is possible to mitigate a sudden pressure fluctuation in the pump chambers 14 and prevent cavitation and liquid hammer.
【００２７】また、前記連通手段２０として面取り部２
２を形成することにより、構成が簡略であり、製作が容
易で、コストを低廉に維持し得て、経済的に有利であ
る。The chamfered portion 2 is used as the communication means 20.
By forming 2, the structure is simple, the manufacturing is easy, the cost can be kept low, and it is economically advantageous.
【００２８】更に、従来の全てのポンプ室を連通する構
造のものに比し、オイルポンプの効率の低下を抑制する
ことができることにより、実用上有利であるとともに、
オイルポンプの吐出量を補うためのオイルポンプの大型
化を避けることができ、メカロスの増加につながる惧れ
がないものである。Further, as compared with the conventional structure in which all pump chambers are communicated with each other, it is possible to suppress a decrease in the efficiency of the oil pump, which is advantageous in practical use and
It is possible to avoid increasing the size of the oil pump for compensating the discharge amount of the oil pump, and there is no fear of increasing the mechanical loss.
【００２９】なお、この発明は上述実施例に限定される
ものではなく、種々の応用改変が可能である。The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.
【００３０】例えば、この発明の実施例において、前記
アウタロータとインナロータとの偶数の歯数を有するい
ずれか一方のロータとしてインナロータの歯先部位に、
１歯飛びに連通手段である面取り部を設けたが、オイル
ポンプによっては、アウタロータが偶数の歯数を有する
ものがあり、このような場合にはアウタロータの歯先部
位に１歯飛びに面取り部を設けることができるととも
に、前記面取り部以外にも、ポンプ室を吸込側あるいは
吐出側のいずれか一方の隣接するポンプ室に連通させる
構成ものであれば良く、段差部や切欠き部、孔部等を連
通手段として使用することも可能である。For example, in the embodiment of the present invention, one of the rotors having an even number of teeth of the outer rotor and the inner rotor is provided at the tooth tip portion of the inner rotor,
Although the chamfered portion that is the communicating means is provided for every one tooth jump, depending on the oil pump, the outer rotor may have an even number of teeth. In such a case, the chamfered portion for every one tooth jump at the tooth tip portion of the outer rotor. In addition to the chamfered portion, any structure that allows the pump chamber to communicate with the adjacent pump chamber on either the suction side or the discharge side may be provided, and the stepped portion, the cutout portion, and the hole portion may be provided. It is also possible to use etc. as a communication means.
【００３１】[0031]
【発明の効果】以上詳細に説明した如くこの発明によれ
ば、オイルポンプケースに複数の歯数を有するアウタロ
ータとこのアウタロータよりも１枚少ない歯数を有する
インナロータとを収容して設けるとともにアウタロータ
とインナロータとによって形成されるポンプ室に連通す
る吸込ポートと吐出ポートとを夫々設けたオイルポンプ
において、アウタロータとインナロータとの偶数の歯数
を有するいずれか一方のロータの歯先部位に、ポンプ室
が吸込側あるいは吐出側のいずれか一方の隣接するポン
プ室に連通すべく１歯飛びに連通手段を設けたので、ア
ウタロータとインナロータとの偶数の歯数を有するいず
れか一方のロータの歯先部位に設けた連通手段によって
ポンプ室が吸込側あるいは吐出側のいずれか一方の隣接
するポンプ室に連通することとなり、ポンプ室内の急激
な圧力変動を緩和することができ、キャビテーションや
液体ハンマを防止し得る。また、従来の全てのポンプ室
を連通する構造のものに比し、オイルポンプの効率の低
下を抑制することができることにより、実用上有利であ
るとともに、オイルポンプの吐出量を補うためのオイル
ポンプの大型化を避けることができ、メカロスの増加に
つながる惧れがないものである。As described in detail above, according to the present invention, the oil pump case is provided with the outer rotor having a plurality of teeth and the inner rotor having a number of teeth one less than that of the outer rotor, and the outer rotor. In an oil pump provided with a suction port and a discharge port that communicate with a pump chamber formed by an inner rotor, the pump chamber has a tooth tip portion of one of the rotors having an even number of teeth of the outer rotor and the inner rotor. Since the communication means is provided for every one tooth jump so as to communicate with the adjacent pump chamber on either the suction side or the discharge side, the tooth tip portion of either rotor having an even number of teeth of the outer rotor and the inner rotor is provided. By the communication means provided, the pump chamber is connected to the adjacent pump chamber on either the suction side or the discharge side. It and will be, it is possible to relieve the sudden pressure change in the pump chamber, it can prevent cavitation and liquid hammer. Further, as compared with the conventional structure in which all pump chambers are communicated with each other, it is possible to suppress the decrease in the efficiency of the oil pump, which is practically advantageous and is an oil pump for compensating the discharge amount of the oil pump. It is possible to avoid the increase in size and there is no fear of increasing the mechanical loss.
【図１】この発明の実施例のオイルポンプのインナロー
タを示し、（ａ）はインナロータの正面図、（ｂ）は図
１（ａ）の〓ｂ−〓ｂ線による断面図である。FIG. 1 shows an inner rotor of an oil pump according to an embodiment of the present invention, (a) is a front view of the inner rotor, and (b) is a sectional view taken along the line “b-〓b” of FIG. 1 (a).
【図２】オイルポンプの正面図である。FIG. 2 is a front view of an oil pump.
【図３】この発明の従来のオイルポンプの正面図であ
る。FIG. 3 is a front view of a conventional oil pump of the present invention.
【図４】この発明の第１の従来技術を示すオイルポンプ
の正面図である。FIG. 4 is a front view of an oil pump showing a first conventional technique of the present invention.
【図５】オイルポンプのインナロータを示し、（ａ）は
インナロータの正面図、（ｂ）は図５（ａ）のＶｂ−Ｖ
ｂ線による断面図である。5A and 5B show an inner rotor of an oil pump, FIG. 5A is a front view of the inner rotor, and FIG. 5B is Vb-V of FIG.
It is sectional drawing by the b line.
【図６】この発明の第２の従来技術を示すオイルポンプ
の正面図である。FIG. 6 is a front view of an oil pump showing a second prior art of the present invention.
【図７】オイルポンプのインナロータを示し、（ａ）は
インナロータの正面図、（ｂ）は図７（ａ）のＶ〓〓ｂ
−Ｖ〓〓ｂ線による断面図である。FIG. 7 shows an inner rotor of an oil pump, (a) is a front view of the inner rotor, and (b) is V〓〓b of FIG. 7 (a).
It is a sectional view taken along the line -V〓〓b.
２ オイルポンプ ４ オイルポンプケース ４ａ 収容部 ６ アウタロータ ８ アウタ側歯部 １０ インナ側歯部 １０−１ 第１インナ側歯部 １０−２ 第２インナ側歯部 １０−３ 第３インナ側歯部 １０−４ 第４インナ側歯部 １０−５ 第５インナ側歯部 １０−６ 第６インナ側歯部 １２ インナロータ １４ ポンプ室 １６ 吸込ポート １８ 吐出ポート ２０ 連通手段 ２２ 面取り部 2 Oil Pump 4 Oil Pump Case 4a Housing 6 Outer Rotor 8 Outer Side Teeth 10 Inner Side Teeth 10-1 First Inner Side Teeth 10-2 Second Inner Side Teeth 10-3 Third Inner Side Teeth 10 -4 4th inner side tooth part 10-5 5th inner side tooth part 10-6 6th inner side tooth part 12 Inner rotor 14 Pump chamber 16 Suction port 18 Discharge port 20 Communication means 22 Chamfer part
Claims (1)
るアウタロータとこのアウタロータよりも１枚少ない歯
数を有するインナロータとを収容して設けるとともに前
記アウタロータとインナロータとによって形成されるポ
ンプ室に連通する吸込ポートと吐出ポートとを夫々設け
たオイルポンプにおいて、前記アウタロータとインナロ
ータとの偶数の歯数を有するいずれか一方のロータの歯
先部位には、前記ポンプ室が吸込側あるいは吐出側のい
ずれか一方の隣接するポンプ室に連通すべく１歯飛びに
連通手段を設けたことを特徴とするオイルポンプ。1. An oil pump case is provided with an outer rotor having a plurality of teeth and an inner rotor having a number of teeth one less than that of the outer rotor, and is connected to a pump chamber formed by the outer rotor and the inner rotor. In an oil pump provided with a suction port and a discharge port, respectively, at the tooth tip portion of one of the rotors having an even number of teeth of the outer rotor and the inner rotor, the pump chamber is either the suction side or the discharge side. An oil pump characterized in that a communicating means is provided for every one tooth jump so as to communicate with one adjacent pump chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132798A JPH09296716A (en) | 1996-04-30 | 1996-04-30 | Oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132798A JPH09296716A (en) | 1996-04-30 | 1996-04-30 | Oil pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09296716A true JPH09296716A (en) | 1997-11-18 |
Family
ID=15089822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8132798A Pending JPH09296716A (en) | 1996-04-30 | 1996-04-30 | Oil pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09296716A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1640610A2 (en) | 2004-09-28 | 2006-03-29 | Aisin Seiki Kabushiki Kaisha | Rotor structure of inscribed gear pump |
| JP2011052659A (en) * | 2009-09-04 | 2011-03-17 | Sumitomo Electric Sintered Alloy Ltd | Internal gear pump |
-
1996
- 1996-04-30 JP JP8132798A patent/JPH09296716A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1640610A2 (en) | 2004-09-28 | 2006-03-29 | Aisin Seiki Kabushiki Kaisha | Rotor structure of inscribed gear pump |
| JP2011052659A (en) * | 2009-09-04 | 2011-03-17 | Sumitomo Electric Sintered Alloy Ltd | Internal gear pump |
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