CN209724638U - Oil pump - Google Patents

Abstract

The utility model, which provides one kind, to inhibit the oil pump that the efficiency of pump is deteriorated or hydro pulse generates by preventing the pressure of enclosure space from excessively increasing.The oil pump includes: port part (20), it is formed on shell (11), is open towards internal rotor (13) and outer rotor (12) with gap, that is, sideshake portion (18) in the axis direction of shell (11)；Valve body (21) is opened and closed port part (20)；Solenoid (30) drives valve body (21)；Control unit (100) controls solenoid (30)；And rotation sensor (110), detect the revolving speed of oil pump (10)；And when the revolving speed that control unit (100) is configured to the oil pump (10) detected by rotation sensor (110) reaches specified value or more, valve body (21) is driven using solenoid (30) and opens port part (20).

Description

Oil pump

Technical field

The utility model relates to a kind of oil pumps, specifically, be related to it is a kind of by outer rotor (outer rotor) with it is interior Volume between rotor (inner rotor) changes and carries out under the pumping action of generation the displacement type oil of sucking and the ejection of oil Pump.

Background technique

Before, in variable-speed motor being equipped on vehicle etc., there is the lubrication and cooling use for gear or rotary shaft etc. Oil (lubricating oil or working oil) conveying oil pump.In this oil pump, have by being passed from the driving source of the vehicles such as engine The rotation passed and the mechanical type oil pump (gear pump) driven.In this oil pump, for example, as shown in Patent Document 1, as lubrication Oil pump, it is known that make in the pump that the volume variation by (gap radially) between outer rotor and internal rotor generates With the oil pump of the lower displacement type (trochoid (trochoid) type) for being sucked and being sprayed.

In the oil pump shown in patent document 1, when the volume between outer rotor and internal rotor becomes maximum volume, in institute State the space i.e. enclosure space (closed area) that temporarily sealing is formed between outer rotor and the internal rotor.However, in oil pump The pressure of the enclosure space excessively increases when high speed rotation, it is possible to making the deterioration of efficiency of oil pump, or sprays from oil pump The oil pressure of oil out generates pulsation.

[existing technical literature]

[patent document]

[patent document 1] Japanese Patent Laid-Open 2014-234765 bulletin

Utility model content

[utility model problem to be solved]

The utility model is done in view of the above aspects, and its purpose is to provide one kind can be by preventing closing empty Between pressure excessively increase, and inhibit the efficiency of pump be deteriorated or hydro pulse generate oil pump.

[technical means to solve problem]

The utility model for solving described problem is a kind of oil pump 10, comprising: internal rotor 13 is supported in rotary shaft 15 It goes up and there are multiple external tooth 13a；Outer rotor 12 is mutually engaged in the state of bias with internal rotor 13, and is had than internal rotor The greater number of internal tooth 12a of 13 external tooth；And shell (casing) 11, rotatably freely accommodate outer rotor 12；And pass through Volume between the external tooth 13a of internal rotor 13 and the internal tooth 12a of outer rotor 12 changes and carries out the sucking and ejection of oil, the oil Pump 10 includes: portion port (port) 20, is formed on shell 11, towards the axis direction of internal rotor 13 and outer rotor 12 and shell 11 On gap, that is, sideshake portion 18 (side clearance) opening；Valve body 21 is opened and closed port part 20；Driving portion 30, to valve body 21 are driven；Control unit 100 controls driving portion 30；And Rotating speed measring element 110, to the revolving speed of oil pump 10 into Row detection；And the revolving speed N of the oil pump 10 detected by Rotating speed measring element 110 of control unit 100 reaches specified value or more (N ≤ N1) when, valve body 21 is driven using driving portion 30 and opens port part 20.

The oil pump of the structure according to the present utility model is configured to utilize driving when revolving speed reaches specified value or more Portion drives valve body and opens the port part being open towards sideshake portion, so as to the envelope between outer rotor and internal rotor The pressure for closing space is possible in the state that raised oil pump is high speed rotation, by opening the port that is open towards sideshake portion Portion, and extend the volume in sideshake portion.Thereby, it is possible to so that a part of the oil for the enclosure space being connected to sideshake portion is expelled to sideshake Portion, it is thus possible to prevent the pressure of enclosure space from excessively increasing.Therefore, it is able to suppress efficiency of pump variation or hydro pulse generates.

It also, is a kind of oil pump 10 for solving the utility model of described problem, comprising: internal rotor 13 is supported in rotation In shaft 15 and there are multiple external tooth 13a；Outer rotor 12 is mutually engaged in the state of bias with internal rotor 13, and have than The greater number of internal tooth 12a of the external tooth of internal rotor 13；And shell 11, rotatably freely accommodate outer rotor 12；And by interior Volume between the external tooth 13a of rotor 13 and the internal tooth 12a of outer rotor 12 changes and carries out the sucking and ejection of oil, the oil pump 10 include: port part 20, is formed on shell 11, towards internal rotor 13 and outer rotor 12 and the gap in the axis direction of shell 11 I.e. sideshake portion 18 is open；Valve body 21 can movably be set to the open position and shutdown side oral area 20 for opening port part 20 Between closed position；And biasing member 60, it exerts a force to valve body 21 towards closed position；And it is configured to when sideshake portion 18 Pressure (P) when reaching specified value or more (P≤P1), pass through the pressure lower valve body 21 in the sideshake portion 18 and resist biasing member 60 power applied and open port part 20 to open position is mobile.

The oil pump of the structure according to the present utility model is configured to when the pressure in sideshake portion reaches specified value or more, End is opened to open position movement and the pressure lower valve body in the sideshake portion resists the power of biasing member applied Oral area in the state of so as to by the pressure rise of the enclosure space between outer rotor and internal rotor, is opened towards side The port part of gap portion opening, and extend the volume in sideshake portion.Thereby, it is possible to make the one of the oil for the enclosure space being connected to sideshake portion Part is expelled to sideshake portion, thus can prevent the pressure of enclosure space from excessively increasing.Therefore, can inhibit the efficiency of pump be deteriorated or Hydro pulse generates.

It also, is a kind of oil pump 10 for solving the utility model of described problem, comprising: internal rotor 13 is supported in rotation In shaft 15 and there are multiple external tooth 13a；Outer rotor 12 is mutually engaged in the state of bias with internal rotor 13, and have than The greater number of internal tooth 12a of the external tooth of internal rotor 13；And shell 11, rotatably freely accommodate outer rotor 12；And by interior Volume between the external tooth 13a of rotor 13 and the internal tooth 12a of outer rotor 12 changes and carries out the sucking and ejection of oil, the oil pump 10 include: flow rate regulating valve 80, is set on the flow path 75 being connected to the sucting 10a of oil pump 10；Control unit 100, to flow Adjustment valve 80 is controlled；And Rotating speed measring element 110, detect the revolving speed of oil pump 10；And control unit 100 is in Rotating speed measring When the revolving speed (N) of oil pump 10 detected by element 110 reaches specified value or more (N≤N1), by flow rate regulating valve 80 come into Row limitation flows into the control of the flow of the oil of the sucting 10a of oil pump 10.

The oil pump of the structure according to the present utility model, when revolving speed reaches specified value or more, by utilizing flow tune Whole valve is limited in the control of the flow of the oil flowed in the flow path being connected to sucting, and can be in outer rotor and internal rotor Between the pressure of enclosure space be possible to raised oil pump and be in the state of high speed rotation, limitation flows into the closing of oil pump The flow of oil in space.Thereby, it is possible to prevent the pressure of enclosure space from excessively increasing.Therefore, it is able to suppress efficiency of pump variation Or hydro pulse generates.

Also, any oil pump according to the present utility model is not needed size (shell and outer turn in sideshake portion itself The gap size in axis direction between son and internal rotor) it is redefined for large scale, and can be by the sideshake portion itself Size is set small, so can inhibit few by the leakage flow of oil pump.Therefore, it can readily insure that oil pump is revolved with low speed Required flow when turning, so can be improved the running efficiency of oil pump.

Furthermore the symbol in the bracket is using the symbol of the corresponding structural element of aftermentioned embodiment as this reality It is indicated with novel an example.

[effect of utility model]

Oil pump according to the present utility model, by the pressure for preventing the enclosure space being formed between internal rotor and outer rotor It excessively increases, efficiency of pump variation or hydro pulse can be inhibited to generate.

Detailed description of the invention

Fig. 1 is the in-built side view of the oil pump for the first embodiment for indicating the utility model.

Fig. 2 is the figure for indicating oil pump, and is to indicate the X-X of Fig. 1 to the figure in the section of view.

Fig. 3 is the control circuit for indicating the circulating path and solenoid valve (solenoid valve) of the oil comprising oil pump The figure of structure.

(a) of Fig. 4 and (b) of Fig. 4 are for the figure for the flowing for illustrating the oil in sideshake portion, and (a) of Fig. 4 is to indicate port part Figure when closing, (b) of Fig. 4 are the figures indicated when port part is opened.

Fig. 5 is the figure for indicating the oil pump of second embodiment of the utility model.

(a) of Fig. 6 and (b) of Fig. 6 are for the figure for the flowing for illustrating the oil in sideshake portion, and (a) of Fig. 6 is to indicate port part Figure when closing, (b) of Fig. 6 are the figures indicated when port part is opened.

Fig. 7 is the figure for indicating the oil pump of third embodiment of the utility model.

Fig. 8 is the figure for indicating the structure of the control circuit of circulating path and solenoid valve of the oil comprising oil pump.

[explanation of symbol]

10,10-2,10-3: oil pump

10a: suction inlet (sucting)

10b: ejiction opening (blowing unit)

11: shell

12: outer rotor

12a: internal tooth

13: internal rotor

13a: external tooth

15: pump shaft (rotary shaft)

18: sideshake portion

20: port part

21: valve body

22: portion of taking a seat

23: containment member

30: solenoid (driving portion)

31: plunger

51: oil sump

52: oil filter

53: lubrication and cooling end

60: helical spring (biasing member)

70: circulating path

75: oil circuit (flow path)

80: solenoid valve (flow rate regulating valve)

100: control unit

110: rotation sensor (Rotating speed measring element)

S: enclosure space (closed area)

Specific embodiment

Hereinafter, the embodiments of the present invention is described in detail referring to attached drawing.

[first embodiment]

Fig. 1 and Fig. 2 is the figure for indicating the oil pump of first embodiment of the utility model, and Fig. 1 is to indicate in-built Side view, Fig. 2 are to indicate the X-X of Fig. 1 to the figure in the section of view.These Fig. 1 and oil pump shown in Fig. 2 10 are in for motor vehicle change In fast machine, the oil pump of the conveying of the lubrication and cooling working oil (oil) for mechanical realizations such as gears.The oil pump 10 is It is passed through the driving force of engine and the rotation of crank axle (crank shaft) (not shown) rotated and the machinery rotated Formula oil pump, and be the trochoid pump of displacement type, including being freely and rotatably supported in outer in shell (shell (housing)) 11 It rotor 12 and is freely and rotatably supported in the internal rotor 13 of the inside of the outer rotor 12.Furthermore it saves in fig. 1 and fig. 2 Sketch map shows, but oil pump 10 includes for sucking oily suction inlet (referring to suction inlet 10a shown in Fig. 3) and for spraying The ejiction opening of oil (referring to ejiction opening 10b shown in Fig. 3).

Internal rotor 13 can not be installed with the relative rotation on the outer peripheral surface of pump shaft (rotary shaft) 15, thus pump shaft 15 with interior turn Son 13 always integrally rotates.Also, pump shaft 15 and internal rotor 13 are to be mounted to same core.

Internal rotor 13 is the driving rotor (drive rotor) that rotation driving is carried out to outer rotor 12, is had than outer rotor 12 few one number of teeth are tool in the example depicted in fig. 1 there are six external tooth 13a, and waveform is, for example, to be based on trochoid curves And it shapes.

Outer rotor 12 is that had by the driven rotor (driven rotor) of the rotation driving of internal rotor 13 always than internal rotor 13 More one number of teeth, in the example depicted in fig. 1 be have seven internal tooth 12a, waveform be for example based on trochoid curves and Forming.Also, outer rotor 12 be its axle center relative to the axle center of internal rotor 13 and the axis deviation of pump shaft 15 and rotatably freely It is contained in shell 11.

Space, that is, enclosure space (closed area) S of temporarily sealing is formed between outer rotor 12 and internal rotor 13.Work as pump When axis 15 rotates, the internal tooth 12a of outer rotor 12 is engaged with the external tooth 13a phase of internal rotor 13 and is rotated, along with these components Rotation, position and the volume of enclosure space S change.Moreover, passing through the opportunity of suction inlet in enclosure space S, oil is sucked To enclosure space S, the opportunity of ejiction opening is passed through in enclosure space S, sprays compressed oil from enclosure space S.

Also, as shown in Fig. 2, there are micro- in the gap in the axis direction of internal rotor 13 and outer rotor 12 and shell 11 Small gap, that is, sideshake portion 18.Enclosure space S between the outer rotor 12 and internal rotor 13 is connected to the sideshake portion 18.And And in the oil pump of present embodiment 10, the concave port part 20 being open towards sideshake portion 18 is formed on shell 11.It is holding In oral area 20, it is provided with the valve body 21 for being opened and closed the port part 20.The plunger of valve body 21 and solenoid (driving portion) 30 (plunger) 31 connection, and closed position and opening with moving forward and backward along with the plunger 31, in shutdown side oral area 20 The mode that is moved between the open position of port part 20 and constitute, be thus opened and closed port part 20.It is fallen what valve body 21 was taken a seat In portions 22, it is provided with the containment members 23 such as the O-ring being sealed for the gap to valve body 21 and portion 22 of taking a seat.

Fig. 3 is the figure for indicating the structure of the control circuit of circulating path and solenoid 30 of the oil comprising oil pump 10.As institute It states shown in Fig. 3, is provided with the control unit 100 of driving solenoid 30 and the opening and closing of control terminal oral area 20.Control unit 100 can also To be electronic control unit (the Electronic Control for carrying out the speed Control of the variable-speed motor equipped with oil pump 10 Unit, ECU) a part etc..Also, it is provided with rotation sensor (the Rotating speed measring member detected to the rotation of oil pump 10 Part) 110.The detected value of the revolving speed of oil pump 10 detected by rotation sensor 110 is input to control unit 100.

Also, as shown in figure 3, the circulating path 70 for recycling oil includes the shell 11 (not shown) for being set to variable-speed motor The oil sump (oil pan) of bottom etc. (oily reservoir) 51 and oil filter (the oil that is set in oil sump 51 strainer)52.The outlet of oil filter 52 is connected to suction inlet (sucting) 10a of oil pump 10.Also, it will be from the spray of oil pump 10 The oil that (blowing unit) 10b sprays is exported, is supplied to the need of the intracorporal gear of shell, clutch (clutch), bearing of variable-speed motor etc. The position for lubricating or cooling down lubricates and cooling end 53.The supply extremely shell of lubrication and the oil stream of cooling end 53 down toward variable-speed motor Lower part and be back to oil sump 51.It is sucked via oil filter 52 from the suction inlet 10a of oil pump 10 by the operating of oil pump 10 The oil of oil sump 51.Furthermore it subtracts as shown in figure 3, the practical spray volume of the ejiction opening 10b from oil pump 10 becomes from sideshake Leakage rate (bump leakage amount) the resulting amount in portion 18.

(a) of Fig. 4 and (b) of Fig. 4 are the flowings for illustrating the enclosure space S in oil pump 10 and the oil in sideshake portion 18 Scheme (the Y partial enlarged view of Fig. 2), (a) of Fig. 4 is the figure indicated when port part 20 is closed, and (b) of Fig. 4 is to indicate port part 20 Figure when opening.In the oil pump 10 of present embodiment, the revolving speed N of the oil pump 10 detected by the rotation sensor 110 reaches When more than specified value revolving speed (revolving speed of threshold rotation rate N1 or more), solenoid 30 works and opens port part 20.Pass through port Portion 20 opens, and the volume in the sideshake portion 18 being connected to enclosure space S is made to change (increase).Thereby, it is possible to make to close The pressure reduction of space S.That is, in the state that the revolving speed N of oil pump 10 does not reach threshold rotation rate N1 (N < N1), such as described Fig. 4 (a) shown in, solenoid 30 does not work, and port part 20 is closed.In this condition, the volume in sideshake portion 18 does not expand.Another party Face, in the state that the revolving speed N of oil pump 10 is threshold rotation rate N1 or more (N≤N1), solenoid 30 works and opens port part 20. Become following state as a result: the volume enlargement in sideshake portion 18 is equivalent to the degree of the volume of port part 20.Therefore, in oil pump 10 when rotating to be high speed rotation can make the pressure reduction of enclosure space S being connected to sideshake portion 18.

As described above, oil pump 10 according to the present embodiment is configured to reach specified value or more as the revolving speed N of oil pump 10 When, valve body 21 is driven using solenoid 30 and opens the port part 20 being open towards sideshake, so as in outer rotor The pressure of enclosure space S between 12 and internal rotor 13 is possible to raised oil pump 10 and is in the state of high speed rotation, passes through The port part 20 being open towards sideshake portion 18 is opened, and extends the volume in sideshake portion 18.Thereby, it is possible to make to be connected to sideshake portion 18 Enclosure space S oil a part be expelled to sideshake portion 18, so can prevent the pressure of enclosure space S from excessively increasing.Cause This, is able to suppress efficiency of pump variation or hydro pulse generates.

Also, oil pump 10 according to the present embodiment is not needed size (shell 11 and the outer rotor in sideshake portion 18 itself The gap size in axis direction between 12 and internal rotor 13) it is redefined for large scale, and can be by the sideshake portion 18 certainly The size of body is set small, therefore can inhibit few by the leakage flow of oil pump 10.Therefore, oil pump 10 can be readily insured that Required flow when being operated with low speed rotation, so can be improved the running efficiency of oil pump 10.

[second embodiment]

Secondly, the second embodiment to the utility model is illustrated.Furthermore in the explanation and phase of second embodiment In corresponding attached drawing, identical symbol is marked to identical with first embodiment or comparable structure division, hereinafter, omitting to institute State the detailed description of part.Also, about other than item described below item and it is illustrated other than item, with first Embodiment is identical.About following other embodiments, the aspect is also same.

Fig. 5 is the figure of the oil pump 10-2 for the second embodiment for indicating the utility model.The oil pump 10-2 of present embodiment In, as the switching mechanism for the port part 20 being set in sideshake portion 18, replace the oil pump 10 of first embodiment to be included Using the switching mechanism of solenoid 30, and including the use of the switching mechanism of helical spring (biasing member) 60.That is, as shown in figure 5, In port part 20, it is provided with the helical spring (biasing member) 60 being installed on valve body 21.Helical spring 60 is to 21 court of valve body It exerts a force to the portion of taking a seat 22, in following state when usual: passing through valve body 21 using the power of helical spring 60 applied Close port part 20.

(a) of Fig. 6 and (b) of Fig. 6 are for illustrating enclosure space S and sideshake portion in the oil pump 10-2 of present embodiment The figure of the flowing of 18 oil, (a) of Fig. 6 are the figures indicated when port part 20 is closed, and (b) of Fig. 6 is to indicate that port part 20 is opened When figure.In the oil pump 10-2 of present embodiment, when the pressure of the oil in sideshake portion 18 reaches the pressure (threshold value of specified value or more The pressure of pressure P1 or more) when, valve body 21 can resist the power of helical spring 60 applied and be moved to opening from closed position Position, to open port part 20.It is opened by port part 20, and makes the volume in sideshake portion 18 being connected to enclosure space S Change (increase).Thus, it is possible to make the pressure reduction of enclosure space S.

That is, in the state that the pressure P in sideshake portion 18 and enclosure space S does not reach threshold pressure P1 (P < P1), such as Fig. 6 (a) shown in, valve body 21 is seated at the portion of taking a seat 22, and port part 20 is closed.In this condition, the volume in sideshake portion 18 does not expand. On the other hand, in the state that the pressure P of sideshake portion 18 and enclosure space S are threshold pressure P1 or more (P≤P1), pass through valve body 21 separate with the portion of taking a seat 22 and open port part 20.Become following state as a result: the volume enlargement in sideshake portion 18 is equivalent to end The degree of the volume of oral area 20.When therefore, more than the pressure rise to specified value for the enclosure space S being connected to sideshake portion 18, The pressure of the enclosure space S can be made to decline.

As described above, oil pump 10-2 according to the present embodiment is configured to reach specified value when the pressure in sideshake portion 18 When above, using the pressure in the sideshake portion 18, so that valve body 21 is resisted the power of helical spring 60 applied and to open position Movement is to open port part 20, so as to the shape of the pressure rise of the enclosure space S between outer rotor 12 and internal rotor 13 Under state, by opening the port part 20 being open towards sideshake portion 18, and the volume in sideshake portion 18 is extended.Thereby, it is possible to make and side A part of the oil for the enclosure space S that gap portion 18 is connected to is expelled to sideshake portion 18, so the pressure mistake of enclosure space S can be prevented Degree increases.Therefore, efficiency of pump variation or hydro pulse can be inhibited to generate.

Also, in the oil pump 10-2 of present embodiment, do not need for the size in sideshake portion 18 itself to be redefined for yet Large scale, and the size in the sideshake portion 18 itself can be set small, so the leakage flow of oil pump 10-2 can be pressed down It is made few.Therefore, it can easily be ensured that required flow when oil pump 10-2 is operated with low speed rotation, so can be improved oil pump The running efficiency of 10-2.

[third embodiment]

Secondly, the third embodiment to the utility model is illustrated.Fig. 7 is the oil pump for indicating third embodiment The figure of 10-3.Also, Fig. 8 is the control circuit for indicating the circulating path 70-3 and solenoid valve 80 of the oil comprising oil pump 10-3 The figure of structure.The oil pump 10 that the oil pump 10-3 of present embodiment as shown in fig. 7, be omitted is set to first embodiment included Sideshake portion 18 on port part 20 and using solenoid 30 switching mechanism.On the other hand, as shown in figure 8, including being set to The solenoid valve 80 on oil circuit 75 being connected to the suction inlet 10a of oil pump 10-3.Solenoid valve 80 is can be by control unit 100 Control and the flow rate regulating valve that is adjusted of flow to the oil flowed in oil circuit 75.

In the oil pump 10-3 of present embodiment, the revolving speed N of the oil pump 10-3 detected by the rotation sensor 110 reaches When more than specified value revolving speed (revolving speed of threshold rotation rate N1 or more), solenoid valve 80 works and makes the oil flowed in oil circuit 75 Flow-reduction.By making the flow-reduction of the oil flowed in oil circuit 75, the flow for the oil for being sucked into oil pump 10-3 can be made It reduces, and makes the pressure reduction of the enclosure space S of oil pump 10-3.Furthermore make to make flow-reduction by solenoid valve 80 Remaining oil (remaining oil) is back to oil sump 51.

As described above, oil pump 10-3 according to the present embodiment, when the revolving speed of oil pump 10-3 reaches specified value or more, It is flowed by being limited in the oil circuit 75 being connected to the suction inlet 10a of oil pump 10-3 using solenoid valve (flow rate regulating valve) 80 The control of the flow of dynamic oil, and oil pump 10- can be flowed by limitation in the state that oil pump 10-3 is in high speed rotation The flow of oil in 3 enclosure space S, to prevent the pressure of enclosure space S from excessively increasing.Therefore, it is able to suppress efficiency of pump change Difference or hydro pulse generate.

Also, in the oil pump 10-3 of present embodiment, do not need for the size in sideshake portion 18 itself to be redefined for yet Large scale, and the size in the sideshake portion 18 itself can be set small, so the leakage flow of oil pump 10-3 can be pressed down It is made few.Therefore, it can easily be ensured that required flow when oil pump 10-3 is operated with low speed rotation, so can be improved oil pump The running efficiency of 10-3.

Above it is stated that the embodiments of the present invention, but the utility model is not limited to the embodiment, Various modifications can be carried out in the range of the technical idea described in claim and specification and attached drawing.For example, described In one embodiment, the driving portion for the valve body for including the case where that solenoid 30 is opened and closed port part as driving is disclosed, still Driving portion is also possible to structure in addition to this.Also, the solenoid valve being set on oil circuit 75 shown in third embodiment 80 are also not limited to this, can also be set as the flow rate regulating valve of other structures.

Claims (3)

1. a kind of oil pump characterized by comprising

Internal rotor is supported in rotary shaft and has multiple external tooths；

Outer rotor is mutually engaged in the state of bias with the internal rotor, and is had most than the external tooth of the internal rotor The internal tooth of amount；And

Shell rotatably freely accommodates the outer rotor；And

The suction of oil is carried out by the volume variation between the external tooth of the internal rotor and the internal tooth of the outer rotor Enter and spray, the oil pump includes:

Port part is formed on the shell, towards the axis direction of the internal rotor and the outer rotor and the shell on Gap, that is, sideshake portion opening；

Valve body is opened and closed the port part；

Driving portion drives the valve body；

Control unit controls the driving portion；And

Rotating speed measring element detects the revolving speed of the oil pump；And

When the revolving speed of control unit oil pump detected by the Rotating speed measring element reaches specified value or more, utilize The driving portion drives the valve body and opens the port part.

2. a kind of oil pump characterized by comprising

Internal rotor is supported in rotary shaft and has multiple external tooths；

Outer rotor is mutually engaged in the state of bias with the internal rotor, and is had most than the external tooth of the internal rotor The internal tooth of amount；And

Shell rotatably freely accommodates the outer rotor；And

The suction of oil is carried out by the volume variation between the external tooth of the internal rotor and the internal tooth of the outer rotor Enter and spray, the oil pump includes:

Port part is formed on the shell, towards the axis direction of the internal rotor and the outer rotor and the shell on Gap, that is, sideshake portion opening；

Valve body, can movably be set to the open position for opening the port part and the closed position for closing the port part it Between；And

Biasing member exerts a force to the valve body towards the closed position；And

It is configured to make the valve by the pressure using the sideshake portion when the pressure in the sideshake portion reaches specified value or more Body is resisted the power of the biasing member applied and is moved to the open position, to open the port part.

3. a kind of oil pump characterized by comprising

Internal rotor is supported in rotary shaft and has multiple external tooths；

Outer rotor is mutually engaged in the state of bias with the internal rotor, and is had most than the external tooth of the internal rotor The internal tooth of amount；And

Shell rotatably freely accommodates the outer rotor；And

The suction of oil is carried out by the volume variation between the external tooth of the internal rotor and the internal tooth of the outer rotor Enter and spray, the oil pump includes:

Flow rate regulating valve is set on the flow path being connected to the sucting of the oil pump；

Control unit controls the flow rate regulating valve；And

Rotating speed measring element detects the revolving speed of the oil pump；And

When the revolving speed (N) of control unit oil pump detected by the Rotating speed measring element reaches specified value or more, Carry out limiting the control of the flow of the oil for the sucting for flowing into the oil pump by the flow rate regulating valve.