CN205191175U - Rotor type oil pump - Google Patents

Abstract

The utility model provides a rotor type oil pump relates to engine lubricating arrangement technical field, which comprises a housin, the inner rotor, the external rotor, a rotor shaft, pump cover and screw, be equipped with rotor cavity in the casing, be equipped with the first rotor shaft hole and the second rotor shaft hole on pump cover and the casing respectively, the rotor cavity bottom is equipped with first oil storage tank, second oil storage tank and pressure releasing pathway, first oil storage tank communicates with each other with the oil absorption chamber, the second oil storage tank communicates with each other with pressing the oil pocket, form first separation levee between first oil storage tank and second oil storage tank, the second rotor sets up in the shaft hole on first separation levee, pressure releasing pathway runs through first separation levee with second oil storage tank and first oil storage tank intercommunication, establish finite pressure valve in the pressure releasing pathway, the pump cover is fixed a position by location structure with the casing, location structure includes a plurality of hollow position sleeves, position sleeve mounting hole and locating hole, hollow position sleeve bottom close -fitting is in the position sleeve mounting hole, realize pump cover and located the housing in the top entry locating hole, it is fixed in the casing with the pump cover to wear out in the screw follow inner chamber of hollow position sleeve.

Description

A kind of rotor-type oil pump

Technical field

The utility model relates to lubrication system for internal combustion engine technical field, particularly a kind of rotor-type oil pump.

Background technique

Oil pump is most important parts in engine lubrication system, its function is for lubrication system provides the machine oil of enough pressure and flow, the oil pressure that oil pump provides must ensure in certain scope, to ensure that each friction member can be lubricated fully and not damage relevant pressure part.The operating mode of working condition to whole engine lubrication system of oil pump has conclusive effect, if lubrication system is compared to the blood circulation system of human body, so oil pump is exactly the heart of lubrication system, each oil duct branch road is exactly blood vessel, oil pump is each component blood supply continuously in the operation process of motor, thus ensures that motor normally runs.

Common oil pump mainly contains gear type oil pump and rotor-type oil pump, and rotor-type oil pump is made up of housing, internal rotor, external rotor and pump cover etc.Internal rotor is fixed on rotor shaft, is directly or indirectly driven by crankshaft gear, internal rotor and external rotor eccentric setting, and internal rotor drives external rotor to rotate in the same direction together.Total energy holding point contact condition mutually on the tooth form line of each tooth of inner and outer Rotator; Like this, several active chambers are just formed between inner and outer Rotator.When some active chambers turn over from oil sucting cavity, volume increases, and produce vacuum, machine oil is inhaled into active chamber from oil inlet hole; Along with being rotated further of inner and outer Rotator, when this active chamber forwards the position that pumping cavity communicates to, volume diminishes, and oil pressure raises, machine oil through pumping cavity from oil outlet press-in oil leab.

The engine oil pump pressure-limiting valve of current motor is when pressure release, machine oil is from the spill port high velocity jet of pressure-limit valve in crankcase, containing a large amount of gas in crankcase, machine oil and gas produce collide, rub after in machine oil, form a large amount of bubbles, because bubble has compressibility, the fluctuation of main oil gallery engine oil pressure therefore can be affected.In addition, the pump cover of existing oil pump relies on merely bolt presses on housing, for ease of assembling, need between bolt and screw to leave certain matching gap, if matching gap makes the rotor shaft hatch coaxiality error on rotor shaft and pump cover larger compared with senior general, thus, inner and outer Rotator and rotor shaft hatch wearing and tearing are easily caused to strengthen the situation of oil pump shortening in working life, for avoiding the generation of this situation, usually adopt following methods in the industry: the machining accuracy 1, improving bolt and screw, reduce matching gap.2, the assembling of frock clamping auxiliary positioning is adopted.It is comparatively difficult that the matching gap reducing bolt and screw will cause bolt to be screwed into screw, cause efficiency of assembling to reduce; Adopt the auxiliary assembling of frock to need first to be fixed in frock by housing to locate, and then locate pump cover, also need oil pump to disassemble from frock after pump cover and housing have assembled, this way can make efficiency of assembling reduce equally.

Model utility content

The technical problems to be solved in the utility model be to provide a kind of can effectively reduce engine bubble in oil content and rotor-type oil pump easy to assembly.

In order to solve the problems of the technologies described above, the utility model adopts following technological scheme: a kind of rotor-type oil pump, comprise housing, internal rotor, external rotor, rotor shaft, pump cover and screw, described pump cover is connected with housing by screw, rotor chamber is provided with in described housing, described internal rotor and external rotor are located in rotor chamber, it is outside and relative to internal rotor eccentric setting that described external rotor is sheathed on internal rotor, described internal rotor is fixedly connected on rotor shaft, described pump cover and housing are respectively equipped with the first rotor axis hole and the second rotor shaft hatch, one end of described rotor shaft is arranged in the first rotor axis hole, the other end is arranged in the second rotor shaft hatch, oil sucting cavity and pumping cavity is formed between described internal rotor and external rotor, described pump cover offers the filler opening being communicated with oil sucting cavity, be communicated with the oil outlet of pumping cavity, the bottom of described rotor chamber is provided with the first oil storage tank, second oil storage tank and pressure release passage, described first oil storage tank communicates with oil sucting cavity, described second oil storage tank communicates with pumping cavity, described first oil storage tank and the second oil storage tank separate and form the first separation levee in-between, described second rotor shaft hatch is opened on the first separation levee, described pressure release passage runs through the first separation levee and is communicated with the first oil storage tank by the second oil storage tank, pressure-limit valve is provided with in described pressure release passage, described pump cover and housing are located mutually by position structure, described position structure comprises multiple hollow setting sleeve, setting sleeve mounting hole and positioning hole, the bottom close-fitting of described hollow setting sleeve is in setting sleeve mounting hole, the top of described hollow setting sleeve is inserted in positioning hole and is realized pump cover and housing is located, described screw passes along the axis of hollow setting sleeve and pump cover is fixedly connected on housing from its inner chamber.

Further, the madial wall of described pump cover is provided with the 3rd oil storage tank and the 4th oil storage tank, described 3rd oil storage tank communicates with oil sucting cavity, described 4th oil storage tank communicates with pumping cavity, described 3rd oil storage tank and the 4th oil storage tank separate and form the second separation levee in-between, described the first rotor axis hole is opened on the second separation levee.

Wherein, on described internal rotor and external rotor, annular array is provided with multiple through hole, the axis being parallel of the axis of described through hole and internal rotor and external rotor, the number of openings on described internal rotor is equal with the raised teeth number of internal rotor, and the number of openings on described external rotor is equal with the recessed number of teeth of external rotor.

Preferably, the external rotor lubricating cavity for lubricating the outer circumferential face of external rotor is also provided with in described housing, described external rotor lubricating cavity is located at the side of external rotor, and the top of described external rotor lubricating cavity is directly connected with rotor chamber, bottom is directly connected with the first oil storage tank.

Preferred, the top of described first separation levee is provided with the first oil groove, and one end of described first oil groove connects the second oil storage tank, the other end connects the first rotor axis hole.

Preferred, the top of described second separation levee is provided with the second oil groove, and one end of described second oil groove connects the 4th oil storage tank, the other end connects the second rotor shaft hatch.

Wherein, described first oil storage tank, the second oil storage tank, the 3rd oil storage tank and the 4th oil storage tank are all in crescent shape.

Wherein, described pressure-limit valve comprises tubular plunger, dividing plate is provided with in described tubular plunger, the inner chamber of tubular plunger is separated into the spring retention chamber being positioned at anterior pressure-releasing chamber and being positioned at rear portion by described dividing plate, spring is provided with in described spring retention chamber, the top of described spring is against living dividing plate, the tail end of described spring is propped up by an adjusting screw rod, on the outer circumferential face of described tubular plunger, annular is arranged at intervals with multiple aperture communicated with pressure-releasing chamber, described housing is provided with adjustment screw, and described adjusting screw rod screws in from the outside of housing and regulates screw.

Finally, the inwall of described housing is also provided with the strip gab for the inner chamber of screw will be regulated to be communicated with external rotor lubricating cavity.

The beneficial effect that the utility model obtains is: the rotor-type oil pump that the utility model provides is by arranging the first oil storage tank, the second oil storage tank, and the first oil storage tank is communicated with oil sucting cavity, second oil storage tank communicates with pumping cavity, due to the existence of above-mentioned first oil storage tank and the second oil storage tank, significantly reduce the weight of housing, decrease the material needed for shell cast, be conducive to reducing enterprise's cost of production, because the bottom of rotor chamber is located at by above-mentioned first oil storage tank and the second oil storage tank, during oil pump running, first oil storage tank and the machine oil stored in the second oil storage tank just can lubricate that face that internal rotor and external rotor contact with rotor chamber diapire, thus alleviate the wearing and tearing of inner and outer Rotator and rotor chamber diapire, extend the operating life of oil pump, in addition, in the utility model, pressure release passage is communicated with the second oil storage tank and the first oil storage tank, when oil pressure off-rating in pumping cavity, pressure-limit valve is opened, machine oil in pumping cavity flows in the first oil storage tank communicated with oil sucting cavity through the second oil storage tank and pressure release passage, when in pumping cavity, oil pressure returns to rating value, pressure-limit valve cuts out, in the process, machine oil in pumping cavity directly enters in the first oil storage tank (and air content in the first oil storage tank is few, be close to and do not have), thus effectively prevent oil injection at a high speed in crankcase, produce with the gas in crankcase and collide, in machine oil, the situation of a large amount of bubble is formed after friction, finally, the utility model is provided with position structure and positions pump cover and housing, above-mentioned position structure is by hollow setting sleeve, setting sleeve mounting hole and positioning hole composition, its structure is simple and bring impact can not to the immanent structure of housing and pump cover and intensity, and the size of hollow setting sleeve and positioning hole and positional accuracy can be ensured completely by numerical control machine tool, by arranging above-mentioned position structure, the rotor-type oil pump that the utility model provides only need rap pump cover with copper rod when assembling, when the precise positioning namely achieving housing and pump cover after in positioning hole is inserted on the top of hollow setting sleeve completely, do not worry rotor shaft and the excessive problem of rotor shaft hatch coaxiality error completely, assembly process is very light, convenient, efficiency of assembling is high.

Accompanying drawing explanation

Fig. 1 is front of the present utility model overall structure schematic diagram;

Fig. 2 is back of the present utility model overall structure schematic diagram;

Fig. 3 is the overall structure schematic diagram after the utility model removes pump cover;

Fig. 4 is the linkage structure schematic diagram in the utility model between internal rotor and housing;

Fig. 5 is the overall structure schematic diagram of pump cover in the utility model;

Fig. 6 is the overall structure schematic diagram in the utility model rotor chamber;

Fig. 7 is the overall structure schematic diagram of pressure-limit valve in the utility model;

Fig. 8 is vertical profile structural representation when position structure positions pump cover and housing in the utility model;

Fig. 9 is the decomposition texture schematic diagram of Fig. 8;

Reference character is:

1---housing 2---internal rotor 3---external rotor

4---rotor shaft 5---pump cover 6---screws

7---pressure-limit valve 11---rotor chamber 12---the second rotor shaft hatchs

13---the first oil storage tank 14---the second oil storage tank 15---pressure release passage 16---the first separation levees

17---external rotor lubricating cavity 18---adjustment screw 19---strip gab 21---through holes

51---the first rotor axis hole 52---filler opening 53---oil outlet 54---the 3rd oil storage tanks

55---the 4th oil storage tank 56---the second separation levee 71---tubular plunger 72---springs

73---adjusting screw rod 81---hollow setting sleeve 82---setting sleeve mounting hole 83---positioning holes

161---the first oil groove 561---the second oil groove 711---dividing plate 712---pressure-releasing chambers

713---spring retention chamber 714---aperture.

Embodiment

For the ease of the understanding of those skilled in the art, be further described the utility model below in conjunction with embodiment and accompanying drawing, the content that mode of execution is mentioned is not to restriction of the present utility model.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.

In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

As shown in figs 1-9, a kind of rotor-type oil pump, comprise housing 1, internal rotor 2, external rotor 3, rotor shaft 4, pump cover 5 and screw 6, pump cover 5 is connected with housing 1 by screw 6, rotor chamber 11 is provided with in housing 1, internal rotor 2 and external rotor 3 are located in rotor chamber 11, it is outside and relative to internal rotor 2 eccentric setting that external rotor 3 is sheathed on internal rotor 2, internal rotor 2 is fixedly connected on rotor shaft 4, pump cover 5 and housing 1 are respectively equipped with the first rotor axis hole 51 and the second rotor shaft hatch 12, one end of rotor shaft 4 is arranged in the first rotor axis hole 51, the other end is arranged in the second rotor shaft hatch 12, oil sucting cavity and pumping cavity is formed between internal rotor 2 and external rotor 3, pump cover 5 offers the filler opening 52 being communicated with oil sucting cavity, be communicated with the oil outlet 53 of pumping cavity, the bottom of rotor chamber 11 is provided with the first oil storage tank 13, second oil storage tank 14 and pressure release passage 15, first oil storage tank 13 communicates with oil sucting cavity, second oil storage tank 14 communicates with pumping cavity, first oil storage tank 13 and the second oil storage tank 14 separate and form the first separation levee 16 in-between, second rotor shaft hatch 12 is opened on the first separation levee 16, pressure release passage 15 runs through the first separation levee 16 and is communicated with the first oil storage tank 13 by second oil storage tank 14, pressure-limit valve 7 is provided with in pressure release passage 14, pump cover 5 and housing 1 are located mutually by position structure, position structure comprises multiple hollow setting sleeve 81, setting sleeve mounting hole 82 and positioning hole 83, the bottom close-fitting of hollow setting sleeve 81 is in setting sleeve mounting hole 82, realize pump cover 5 in the top insertion positioning hole 83 of hollow setting sleeve 81 to locate with housing 1, screw 6 passes along the axis of hollow setting sleeve 81 and pump cover 5 is fixedly connected on housing 1 from its inner chamber.

What need to illustrate in advance is, concrete restriction is not done to the structure of pressure-limit valve 7 in above-mentioned mode of execution, it will be appreciated by those skilled in the art that, this pressure-limit valve 7 can select any one conventional structure of the prior art, can be such as the pressure-limit valve of ball spherical structure or the pressure-limit valve of piston structure, or be the pressure-limit valve of other structures, as long as it can reach the object according to the Stress control pressure release passage break-make in pumping cavity.

The rotor-type oil pump that above-mentioned mode of execution provides is by arranging the first oil storage tank 13, second oil storage tank 14, and the first oil storage tank 13 is communicated with oil sucting cavity, second oil storage tank 14 communicates with pumping cavity, due to the existence of above-mentioned first oil storage tank 13 and the second oil storage tank 14, significantly reduce the weight of housing 1, decrease housing 1 and cast required material, be conducive to reducing enterprise's cost of production, because the bottom of rotor chamber 11 is located at by above-mentioned first oil storage tank 13 and the second oil storage tank 14, during oil pump running, first oil storage tank 13 just can lubricate that face that internal rotor 2 and external rotor 3 contact with rotor chamber 11 diapire with the machine oil stored in the second oil storage tank 14, thus alleviate the wearing and tearing of inner and outer Rotator and rotor chamber 11 diapire, extend the operating life of oil pump, in addition, in the utility model, pressure release passage 15 is communicated with the second oil storage tank 14 and the first oil storage tank 13, when oil pressure off-rating in pumping cavity, pressure-limit valve 7 is opened, machine oil in pumping cavity flows in the first oil storage tank 13 communicated with oil sucting cavity through the second oil storage tank 14 and pressure release passage 15, when in pumping cavity, oil pressure returns to rating value, pressure-limit valve 7 cuts out, in the process, machine oil in pumping cavity directly enters in the first oil storage tank 13 (and air content in the first oil storage tank 13 is few, be close to and do not have), thus effectively prevent oil injection at a high speed in crankcase, produce with the gas in crankcase and collide, in machine oil, the situation of a large amount of bubble is formed after friction, finally, the utility model is provided with position structure and positions pump cover 5 and housing 1, above-mentioned position structure is by hollow setting sleeve 81, setting sleeve mounting hole 82 and positioning hole 83 form, its structure is simple and bring impact can not to the immanent structure of housing 1 and pump cover 5 and intensity, and the size of hollow setting sleeve 81 and positioning hole 82 and positional accuracy can be ensured completely by numerical control machine tool, by arranging above-mentioned position structure, the rotor-type oil pump that the utility model provides only need rap pump cover 5 with copper rod when assembling, when the precise positioning namely achieving housing 1 and pump cover 5 after in positioning hole 83 is inserted on the top of hollow setting sleeve 81 completely, do not worry the problem that rotor shaft 4 and rotor shaft hatch coaxiality error are excessive completely, assembly process is very light, convenient, efficiency of assembling is high.

Preferably, 3rd oil storage tank 54 and the 4th oil storage tank 55 can also be set at the madial wall of pump cover 5,3rd oil storage tank 54 communicates with oil sucting cavity, 4th oil storage tank 55 communicates with pumping cavity, 3rd oil storage tank 54 and the 4th oil storage tank 55 separate and form the second separation levee 56 in-between, the first rotor axis hole 51 is opened on the second separation levee 56.The same with the effect of the first oil storage tank 13 and the 4th oil storage tank 14, pump cover 5 arranges the weight that the 3rd oil storage tank 54 and the 4th oil storage tank 55 can alleviate pump cover 5, reduces pump cover 5 and cast required material, be conducive to reducing enterprise's cost of production; In addition, when oil pump operates, 3rd oil storage tank 54 can lubricate that face that internal rotor 2 and external rotor 3 contact with pump cover 5 madial wall with the machine oil stored in the 4th oil storage tank 55, thus alleviates the wearing and tearing of inner and outer Rotator and pump cover 5 madial wall, extends the operating life of oil pump.

Further, on internal rotor 2 and external rotor 3, multiple through hole 21 can also be set annular array, the axis of through hole 21 and the axis being parallel of internal rotor 2 and external rotor 3, through hole 21 quantity on internal rotor 2 is equal with the raised teeth number of internal rotor 2, and through hole 21 quantity on external rotor 3 is equal with the recessed number of teeth of external rotor 3.Internal rotor 2 and external rotor 3 arrange the weight that through hole 21 1 can alleviate internal rotor 2 and external rotor 3, minimizing internal rotor 2 and external rotor 3 cast required material, two can reduce internal rotor 2 and the frictional force between external rotor 3 and rotor chamber 11 diapire, in alleviating further, the wearing and tearing of external rotor and rotor chamber 11 diapire, extend the operating life of oil pump, except above-mentioned 2, internal rotor 2 and external rotor 3 arrange through hole 21 can allow machine oil all communicate with pumping cavity with the 3rd oil storage tank 54(first oil storage tank 13 and the 3rd oil storage tank 54 at the first oil storage tank 13) between circulation better, be conducive to the vibrations produced when alleviating oil pump running.

In addition, the external rotor lubricating cavity 17 being used for lubricating the outer circumferential face of external rotor 3 can also be set in housing 1, above-mentioned external rotor lubricating cavity 17 is located at the side of external rotor 3, and ensures that the top of external rotor lubricating cavity 17 is directly connected with rotor chamber 11, bottom is directly connected with the first oil storage tank 13.By arranging external rotor lubricating cavity 17, a part of outer circumferential face of external rotor 3 contacts with storing in external rotor lubricating cavity 17, when oil pump works, external rotor 3 constantly rotates under the drive of internal rotor 2, the outer circumferential face of external rotor 3 constantly contacts the machine oil in external rotor lubricating cavity 17, and under the lubrication of machine oil, the friction factor between the outer circumferential face of external rotor 3 and the sidewall of rotor chamber 11 reduces, wear extent reduces, and extends the working life of oil pump further.

Further, in order to improve the working life of oil pump, the first oil groove 161 can also be set at the top of the first separation levee 16, one end of the first oil groove 161 be connected the second oil storage tank 14, the other end connects the first rotor axis hole 51.As previously described, second oil storage tank 14 communicates with pumping cavity, high-pressure oil in second oil storage tank 14 enters in the gap between rotor shaft 4 outer circumferential face and the first rotor axis hole 51 hole wall through the first oil groove 161, under the lubrication of machine oil, friction factor between rotor shaft 4 outer circumferential face and the first rotor axis hole 51 hole wall is also reduced, therebetween wear extent reduces, and thus, further extends the working life of oil pump.

Further, the second oil groove 561 can be set at the top of the second separation levee 56, one end of the second oil groove 561 connection the 4th oil storage tank 54, the other end are connected the second rotor shaft hatch 12.The effect and the first oil groove 161 that arrange the second oil groove 561 are similar, object introduces in the gap between rotor shaft 4 outer circumferential face and the second rotor shaft hatch 12 hole wall by the high-pressure oil in the 4th oil storage tank 54, thus reduce friction factor between rotor shaft 4 outer circumferential face and the second rotor shaft hatch 12 hole wall, alleviate wearing and tearing between rotor shaft 4 and the second rotor shaft hatch 12, extend the working life of oil pump.

As preferably, the first oil storage tank 13, second oil storage tank 14, the 3rd oil storage tank 54 and the 4th oil storage tank 55 are all in crescent shape.Adopt crescent-shaped slot farthest can alleviate the weight of housing 1 and pump cover 5 first oil storage tank 13, second oil storage tank 14, the 3rd oil storage tank 54 and the 4th oil storage tank 55, at utmost expand the area of contact of machine oil in above-mentioned oil storage tank and inner and outer Rotator bi-side, ensure lubrication effect.

In addition, pressure-limit valve 7 comprises tubular plunger 71, dividing plate 711 is provided with in tubular plunger 71, the inner chamber of tubular plunger 71 is separated into the spring retention chamber 713 being positioned at anterior pressure-releasing chamber 712 and being positioned at rear portion by dividing plate 711, spring 72 is provided with in spring retention chamber 713, the top of spring 72 is against living dividing plate 711, the tail end of spring 72 is propped up by an adjusting screw rod 73, on the outer circumferential face of tubular plunger 71, annular is arranged at intervals with multiple aperture 714 communicated with pressure-releasing chamber 712, housing 1 is provided with and regulates screw 18, and adjusting screw rod 73 screws in from the outside of housing 1 and regulates screw 18.Because pressure-limit valve 7 adopts said structure, when pressure-limit valve 7 opens (namely starting pressure release), machine oil sprays from the aperture 714 tubular plunger 71 outer circumferential face, because aperture 714 annular space is arranged on the outer circumferential face of tubular plunger 71, therefore in the process of pressure release, tubular plunger 71 is stressed in its radial institute is uniform, thus the situation that the inwall uneven wear avoiding the outer circumferential face of the tubular plunger 71 caused because of radial force inequality and pressure release passage 15 is serious.

Finally, in order to alleviate adjusting screw rod 73 in the problem regulating screw 18 internal corrosion, can arrange on the inwall of housing 1 and being communicated with the adjustment inner chamber of screw 18 and the strip gab 19 of external rotor lubricating cavity 17.Thus, machine oil in external rotor lubricating cavity 17 just can enter through strip gab 19 and regulate in screw 18, effectively prevent the situation of the screw failure that the screw thread transition corrosion on adjusting screw rod 73 causes, simultaneously because the lubrication of machine oil, turn adjusting screw rod 73 and also become lighter.

Above-described embodiment is the utility model preferably implementation, and in addition, the utility model can also realize by alternate manner, and under the prerequisite not departing from the technical program design, any apparent replacement is all within protection domain of the present utility model.

The improvements of the utility model relative to prior art are understood more easily in order to allow those of ordinary skill in the art, accompanying drawings more of the present utility model and description are simplified, and for the sake of clarity, present specification is omitted some other elements, and those of ordinary skill in the art it is to be appreciated that these abridged elements also can form content of the present utility model.

Claims (10)

1. a rotor-type oil pump, comprise housing (1), internal rotor (2), external rotor (3), rotor shaft (4), pump cover (5) and screw (6), described pump cover (5) is connected with housing (1) by screw (6), rotor chamber (11) is provided with in described housing (1), described internal rotor (2) and external rotor (3) are located in rotor chamber (11), it is outside and relative to internal rotor (2) eccentric setting that described external rotor (3) is sheathed on internal rotor (2), described internal rotor (2) is fixedly connected on rotor shaft (4), described pump cover (5) and housing (1) are respectively equipped with the first rotor axis hole (51) and the second rotor shaft hatch (12), one end of described rotor shaft (4) is arranged in the first rotor axis hole (51), the other end is arranged in the second rotor shaft hatch (12), oil sucting cavity and pumping cavity is formed between described internal rotor (2) and external rotor (3), described pump cover (5) offers the filler opening (52) being communicated with oil sucting cavity, be communicated with the oil outlet (53) of pumping cavity, it is characterized in that: the bottom of described rotor chamber (11) is provided with the first oil storage tank (13), second oil storage tank (14) and pressure release passage (15), described first oil storage tank (13) communicates with oil sucting cavity, described second oil storage tank (14) communicates with pumping cavity, described first oil storage tank (13) and the second oil storage tank (14) are separate and form the first separation levee (16) in-between, described second rotor shaft hatch (12) is opened on the first separation levee (16), described pressure release passage (15) runs through the first separation levee (16) and is communicated with the first oil storage tank (13) by the second oil storage tank (14), pressure-limit valve (7) is provided with in described pressure release passage (15), described pump cover (5) and housing (1) are located mutually by position structure, described position structure comprises multiple hollow setting sleeve (81), setting sleeve mounting hole (82) and positioning hole (83), the bottom close-fitting of described hollow setting sleeve (81) is in setting sleeve mounting hole (82), realize pump cover (5) in top insertion positioning hole (83) of described hollow setting sleeve (81) to locate with housing (1), described screw (6) passes along the axis of hollow setting sleeve (81) and pump cover (5) is fixedly connected on housing (1) from its inner chamber.

2. rotor-type oil pump according to claim 1, it is characterized in that: the madial wall of described pump cover (5) is provided with the 3rd oil storage tank (54) and the 4th oil storage tank (55), described 3rd oil storage tank (54) communicates with oil sucting cavity, described 4th oil storage tank (55) communicates with pumping cavity, described 3rd oil storage tank (54) and the 4th oil storage tank (55) are separate and form the second separation levee (56) in-between, and described the first rotor axis hole (51) is opened on the second separation levee (56).

3. rotor-type oil pump according to claim 2, it is characterized in that: described internal rotor (2) and the upper annular array of external rotor (3) are provided with multiple through hole (21), the axis of described through hole (21) and the axis being parallel of internal rotor (2) and external rotor (3), through hole (21) quantity on described internal rotor (2) is equal with the raised teeth number of internal rotor (2), and through hole (21) quantity on described external rotor (3) is equal with the recessed number of teeth of external rotor (3).

4. the rotor-type oil pump according to Claims 2 or 3, it is characterized in that: in described housing (1), be also provided with the external rotor lubricating cavity (17) for lubricating the outer circumferential face of external rotor (3), described external rotor lubricating cavity (17) is located at the side of external rotor (3), and the top of described external rotor lubricating cavity (17) is directly connected with rotor chamber (11), bottom is directly connected with the first oil storage tank (13).

5. rotor-type oil pump according to claim 4, it is characterized in that: the top of described first separation levee (16) is provided with the first oil groove (161), one end of described first oil groove (161) connects the second oil storage tank (14), the other end connects the first rotor axis hole (51).

6. rotor-type oil pump according to claim 5, it is characterized in that: the top of described second separation levee (56) is provided with the second oil groove (561), one end connection the 4th oil storage tank (54) of described second oil groove (561), the other end connect the second rotor shaft hatch (12).

7. the rotor-type oil pump according to Claims 2 or 3, is characterized in that: described first oil storage tank (13), the second oil storage tank (14), the 3rd oil storage tank (54) and the 4th oil storage tank (55) are all in crescent shape.

8. rotor-type oil pump according to claim 6, is characterized in that: described first oil storage tank (13), the second oil storage tank (14), the 3rd oil storage tank (54) and the 4th oil storage tank (55) are all in crescent shape.

9. rotor-type oil pump according to claim 8, it is characterized in that: described pressure-limit valve (7) comprises tubular plunger (71), dividing plate (711) is provided with in described tubular plunger (71), the inner chamber of tubular plunger (71) is separated into the spring retention chamber (713) being positioned at anterior pressure-releasing chamber (712) and being positioned at rear portion by described dividing plate (711), spring (72) is provided with in described spring retention chamber (713), the top of described spring (72) is against living dividing plate (711), the tail end of described spring (72) is propped up by an adjusting screw rod (73), on the outer circumferential face of described tubular plunger (71), annular is arranged at intervals with multiple aperture (714) communicated with pressure-releasing chamber (712), described housing (1) is provided with and regulates screw (18), described adjusting screw rod (73) screws in from the outside of housing (1) and regulates screw (18).

10. rotor-type oil pump according to claim 9, is characterized in that: the inwall of described housing (1) is also provided with the strip gab (19) for will the inner chamber of screw (18) be regulated to be communicated with external rotor lubricating cavity (17).