CN113883050A

CN113883050A - Motor oil pump

Info

Publication number: CN113883050A
Application number: CN202111152799.2A
Authority: CN
Inventors: 陈连山; 蒲屹; 牟亦颉; 段胜秋; 胡文强; 蒋银龙; 周伟; 杨波
Original assignee: Sichuan Aerospace Shiyuan Technology Co ltd
Current assignee: Sichuan Aerospace Shiyuan Technology Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-01-04

Abstract

The invention discloses an electric motor oil pump, comprising: the upper end of the transmission shaft extends into the motor shell, and the lower end of the transmission shaft extends into the oil pump shell; the engine oil pump inner rotor is positioned in the engine oil pump shell and is coaxially connected to the transmission shaft so as to rotate along with the transmission shaft; the oil pump outer rotor is annular, and the oil pump inner rotor is eccentrically arranged in the oil pump outer rotor; the outer periphery of the inner rotor of the oil pump is provided with outer teeth, the outer rotor of the oil pump is provided with inner teeth, and the inner teeth and the outer teeth are meshed and matched. According to the invention, the oil pump inner rotor and the oil pump outer rotor are arranged eccentrically, and when the outer teeth on one side are meshed with the inner teeth, the outer teeth on the other side and the inner teeth form a gap which is used as an inlet for filling engine oil into the motor shell, so that the engine oil is convenient to fill in during actual use, and the motor shell is cooled by the engine oil.

Description

Motor oil pump

Technical Field

The invention relates to the field of motor oil pumps, in particular to a motor oil pump.

Background

As engine technology continues to advance, more and more electric components are used on engines.

For example, at present, an engine oil pump generally uses a motor oil pump as an auxiliary oil pump.

In the prior art, an oil pump housing of an electric oil pump is directly connected with a motor housing.

Because the temperature of the engine oil is high, heat is transferred to the motor shell through the engine oil pump shell and further transferred to a stator coil of the motor, a drive control panel connected with the motor and other parts, so that the temperature of the parts is increased.

The temperature rise of the stator coil of the motor can cause the motor to operate unstably, and in extreme cases, even the motor can not work normally.

The over-high temperature of the driving control board can lead to the reduction of the service life of electronic components on the driving control board, and further causes the failure rate of the driving control board to be obviously increased, and the service life of the driving control board is seriously reduced.

For the situation of temperature rise of the motor, most of motor oil pumps in the prior art adopt natural cooling, the cooling effect is poor, and the situation that the work of the motor is influenced by high temperature still exists.

Disclosure of Invention

The invention aims to solve the technical problem that the motor oil pump adopts natural cooling and has poor cooling effect, and aims to provide a motor oil pump which solves the problem that the naturally cooled motor oil pump has poor cooling effect.

The invention is realized by the following technical scheme:

an electric motor oil pump comprising:

the upper end of the transmission shaft extends into the motor shell, and the lower end of the transmission shaft extends into the oil pump shell;

the oil pump inner rotor is positioned in the oil pump shell and is coaxially connected to the transmission shaft so as to rotate along with the transmission shaft;

the oil pump outer rotor is arranged in the oil pump shell;

the oil pump outer rotor is annular, and the oil pump inner rotor is eccentrically arranged in the oil pump outer rotor;

the outer periphery of the inner rotor of the oil pump is provided with outer teeth, the outer rotor of the oil pump is provided with inner teeth, and the inner teeth and the outer teeth are meshed and matched;

when the external teeth on one side are meshed with the corresponding internal teeth, gaps are formed between the external teeth and the internal teeth on the other side, and the gaps are used as inlets for filling engine oil into the motor shell.

In some embodiments, the external teeth and the internal teeth are both scalloped.

In some embodiments, a partition portion is disposed in the motor housing, the partition portion having a shaft hole, the transmission shaft passing through the shaft hole from the motor housing and entering the motor pump housing, the transmission shaft rotatably engaging the shaft hole.

In some embodiments, the partition plate portion is provided with an oil passing hole, and the oil passing hole is located corresponding to the gap, so that the engine oil passes through the gap and then enters the motor housing through the oil passing hole.

In some embodiments, the surface of the partition plate portion facing the inner rotor side of the oil pump is provided with an oil storage groove, and the edge of the oil storage groove extends out of an oil guide groove which is communicated with the shaft hole and the oil storage groove.

In some embodiments, the motor housing and the oil pump housing are integrally formed.

In some embodiments, the lower end surfaces of the oil pump inner rotor and the oil pump outer rotor are flush with the lower end surface of the oil pump housing; a lower end cover is arranged on the lower end face of the engine oil pump shell; and an oil filling hole is formed in the lower end cover, and the position of the oil filling hole corresponds to the meshing surface of the oil pump inner rotor and the oil pump outer rotor.

In some embodiments, an oil discharge groove is formed in the upper surface of the lower end cover to discharge oil, one end of the oil discharge groove is connected to the meshing surface of the oil pump inner rotor and the oil pump outer rotor, and the other end of the oil discharge groove extends to the edge of the lower end cover.

In some embodiments, the lower end surface of the engine oil pump casing is provided with an auxiliary oil groove, and the position of the auxiliary oil groove corresponds to the position of the oil discharge groove.

In some embodiments, the oil filling hole and the oil passing hole are both fan-shaped and are opposite in position.

Compared with the prior art, the invention has the following advantages and beneficial effects:

according to the invention, the oil pump inner rotor and the oil pump outer rotor are arranged eccentrically, and when the outer teeth on one side are meshed with the inner teeth, the outer teeth on the other side and the inner teeth form a gap which is used as an inlet for filling engine oil into the motor shell, so that the engine oil is convenient to fill in during actual use, and the motor shell is cooled by the engine oil.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:

fig. 1 is a schematic structural diagram of an oil pump of a motor according to an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of a rotor of an oil pump in an electric motor oil pump according to an embodiment of the present invention.

Fig. 3 is a schematic view of a partition plate portion of an oil pump of an electric motor according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a lower end cap structure of an oil pump of an electric motor according to an embodiment of the present invention.

Fig. 5 is a schematic view of an assembly structure of an outer rotor and an inner rotor of an oil pump according to an embodiment of the present invention.

100-a drive shaft;

200-motor shell, 210-baffle part, 211-shaft hole, 212-oil hole, 213-oil storage groove and 214-oil guide groove;

300-pump casing, 310-auxiliary oil groove;

400-oil pump inner rotor, 410-outer tooth;

500-outer rotor of oil pump, 510-inner tooth;

600-clearance;

700-lower end cover, 710-oil filling hole, 720-oil discharge groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

An electric motor oil pump has a transmission shaft 100, the transmission shaft 100 is used for transmitting rotating speed, the rotating shaft 100 extends into a motor shell 200, and the rotating shaft is connected with a motor to realize output of the rotating speed. After the transmission shaft 100 generates the rotation speed, the rotation speed is input to the oil pump inner rotor 400 in the pump housing 300.

Further, an oil pump inner rotor 400 and an oil pump outer rotor 500 are provided.

An oil pump inner rotor 400 is provided to one end of the propeller shaft 100.

Both the oil pump inner rotor 400 and the oil pump outer rotor 500 are disposed in the pump case 300.

As shown in fig. 3, the oil pump outer rotor 500 is an annular structure as a whole, and the oil pump inner rotor 400 is disposed inside the oil pump outer rotor 500.

The oil pump inner rotor 400 is engaged with the oil pump outer rotor 500, and when the transmission shaft 100 drives the oil pump inner rotor 400 to rotate, the oil pump inner rotor 400 is engaged with the oil pump outer rotor 500, and oil pumping is realized through negative pressure generated in rotation.

As shown in fig. 3, in a specific fitting structure, the outer periphery of the oil pump inner rotor 400 is provided with outer teeth 410, the oil pump outer rotor 500 is provided with inner teeth 510, and the inner teeth 510 and the outer teeth 410 are engaged with each other.

As shown in fig. 3, the oil pump inner rotor 400 is eccentrically disposed to generate negative pressure during rotation, and apply work to the engine oil, thereby driving the engine oil to pump the oil.

As shown in fig. 3, when the external teeth 410 of one side are engaged with the corresponding internal teeth 510, the external teeth 410 and the internal teeth 510 of the other side form a gap 600, and the gap 600 serves as an inlet for oil to be poured into the motor case 200.

As shown in fig. 3, the gap 600 is generated based on the size of the inner holes of the oil pump inner rotor 400 and the oil pump outer rotor 500, and the oil pump inner rotor 400 is eccentrically disposed in the oil pump outer rotor 500.

In some embodiments, outer teeth 410 and inner teeth 510 are both scalloped.

As shown in fig. 4, the outer teeth 410 and the inner teeth 510 are both configured to have circular arc tooth shapes, which is more convenient for generating negative pressure, and is more beneficial for driving oil. Meanwhile, in such a tooth profile, the contact surfaces of the outer teeth 410 and the inner teeth 510 are more closely spaced.

The arc tooth profile is suitable for an eccentric matching structure, so that the rotating process is more stable, and extra vibration is not easy to generate.

In some embodiments, a partition portion 210 is disposed in the motor housing 200, a shaft hole 211 is disposed on the partition portion 210, and the transmission shaft 100 passes through the shaft hole 211 from the inside of the motor housing 200.

As shown in fig. 3, the partition portion 210 structurally distinguishes the rotor of the motor from the outside, avoids interference, and ensures a necessary structure of the motor. Since the propeller shaft 100 needs to output the rotational speed by the motor, it is necessary to provide the shaft hole 211 through which the propeller shaft 100 passes.

Partition portion 210 is formed by providing shaft hole 211, and when the parts are assembled, drive shaft 100 passes through shaft hole 211 such that one end of drive shaft 100 is positioned in motor housing 200 and the other end is positioned in pump housing 300. The shaft hole 211 plays a role of bearing the transmission shaft 100.

The drive shaft 100 is rotatably engaged with the shaft hole 211.

The transmission shaft 100 is directly rotatably engaged with the shaft hole 211, and this part of the bearing can be saved. To achieve the rotational fit of the drive shaft 100 with the shaft hole 211, the inner wall of the shaft hole 211 needs to be sufficiently smooth. When oil is pumped through the gap 600, it also passes through the shaft hole 211, and plays a role in lubrication.

After the transmission shaft 100 and the shaft hole 211 are lubricated, an oil film formed by engine oil exists between the transmission shaft 100 and the shaft hole 211, and compared with the direct friction of the metal surface in the state without the engine oil, more friction heat is avoided, so that the cooling effect is achieved.

In some embodiments, the partition portion 210 is provided with an oil passing hole 212, and the position of the oil passing hole 212 corresponds to the gap 600, so that the engine oil passes through the gap 600 and then enters the motor housing 200 through the oil passing hole 212, thereby achieving cooling.

The oil passing hole 212 is provided to facilitate the flow of the oil therethrough. The oil passing holes 212 are formed to correspond to the gap 600, and the gap 600 is formed to rotate in the circumferential direction along the meshing surface of the two rotors. Therefore, the position of the oil passing hole 212 corresponds to the vicinity of the meshing position of the two rotors.

In some embodiments, the surface of the partition 210 facing the oil pump inner rotor 400 is provided with an oil groove 213, and the edge of the oil groove 213 extends to lead out an oil guide groove 214, and the oil guide groove 214 connects the shaft hole 211 and the oil groove 213.

As shown in fig. 4, the oil storage tank 213 is a sink, and a part of the passing oil is stored by providing the oil storage tank 213, and the oil in the oil storage tank 213 flows into the shaft hole 211 through the oil guide groove 214, so as to achieve friction lubrication between the shaft hole 211 and the transmission shaft 100.

Through setting up oil storage tank 213, the rethread leads oil groove 214 guide machine oil to enter into transmission shaft 100 department, can realize lasting oiling to shaft hole 211 in, continuously lubricate to guarantee the continuation and the stability of lubricated and cooling effect, can not receive the influence that outside machine oil pours into the interrupt in the short time.

In some embodiments, the motor case 200 and the oil pump case 300 are integrally formed.

By integrally forming the motor case 200 and the oil pump case 300, an integral structure is formed, so that the bearing capacity, strength and stability of the parts are improved.

In some embodiments, the lower end surfaces of the oil pump inner rotor 400 and the oil pump outer rotor 500 are flush with the lower end surface of the oil pump case 300; a lower end cover 700 is arranged on the lower end surface of the engine oil pump shell 300; an oil filling hole 710 is formed in the lower end cover 700, and the position of the oil filling hole 710 corresponds to the meshing surface of the oil pump inner rotor 400 and the oil pump outer rotor 500.

The lower end faces of the oil pump inner rotor 400 and the oil pump outer rotor 500 are flush with the oil pump case 300, so that interference can be avoided.

The end faces of the two rotors are flush with the lower end face of the oil pump shell 300, so that when the lower end cover 700 is tightly assembled to the oil pump shell 300, no extra gap is generated in the axial direction, further, when engine oil is filled, disordered penetration of the engine oil is avoided, and pollution is avoided.

The lower end cap 700 is a part for closing the engine oil pump case 300. External oil injection is also required through the lower end cap 700, and thus an oil injection hole 710 is provided in the lower end cap 700.

In order to ensure that the oil is directly driven by the rotor after passing through the oil filling hole 710. Therefore, the position of the oil filling hole 710 corresponds to the meshing surface of the oil pump inner rotor 400 and the oil pump outer rotor 500, so that the use effect is ensured. If the position of the oil filler hole 710 is greatly deviated from the engagement surface, the oil is liable to be irregularly permeated and contaminated.

In some embodiments, an oil discharge groove 720 is formed on the upper surface of the lower end cap 700 to discharge oil, one end of the oil discharge groove 720 is connected to the mating surface of the oil pump inner rotor 400 and the oil pump outer rotor 500, and the other end extends to the edge of the lower end cap 700.

The oil drain groove 720 is used to drain oil to the outside. One end of the oil discharge groove 720 is connected to the engagement surface, so that oil can be directly discharged. The other end extends to the edge of the lower end cover 700 for directly discharging the oil.

In some embodiments, the lower end surface of the oil pump housing 300 is provided with an auxiliary oil groove 310, and the position of the auxiliary oil groove 310 corresponds to the position of the oil discharge groove 720.

The auxiliary oil groove 310 is used in cooperation with the oil discharge groove 720 to better discharge the used oil.

As shown in fig. 5, the auxiliary oil groove 310 has a fan shape, and a section of the corresponding oil discharge groove 720 has a fan shape. This kind of structural style has formed wider scope in the circumference and has helped the oil extraction, and the oil extraction effect is better.

In some embodiments, the oil inlet 710 and the oil passing hole 212 are both fan-shaped and are located opposite to each other.

Since both the oil pump inner rotor 400 and the oil pump outer rotor 500 need to rotate, the oil filling holes 710 and the oil passing holes 212 are arranged in a fan shape, so that the oil is better driven by the two rotors when passing through.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An electric motor oil pump, comprising:

the upper end of the transmission shaft (100) extends into the motor shell (200), and the lower end of the transmission shaft (100) extends into the oil pump shell (300);

an oil pump inner rotor (400), the oil pump inner rotor (400) being located within the oil pump housing (300) and being coaxially connected to the drive shaft (100) to rotate with the drive shaft (100);

the oil pump outer rotor (500), the said oil pump outer rotor (500) is set up in the said engine pump case (300);

the oil pump outer rotor (500) is annular, and the oil pump inner rotor (400) is eccentrically arranged in the oil pump outer rotor (500);

the outer periphery of the oil pump inner rotor (400) is provided with outer teeth (410), the oil pump outer rotor (500) is provided with inner teeth (510), and the inner teeth (510) are meshed with the outer teeth (410);

when the external teeth (410) on one side are meshed with the corresponding internal teeth (510), the external teeth (410) and the internal teeth (510) on the other side form a gap (600), and the gap (600) is used as an inlet for filling engine oil into the motor shell (200).

2. The electric motor oil pump according to claim 1, characterized in that:

the outer teeth (410) and the inner teeth (510) are both in arc tooth shapes.

3. The electric motor oil pump according to claim 1, characterized in that:

be provided with baffle portion (210) in motor case (200), be provided with shaft hole (211) on baffle portion (210), transmission shaft (100) are followed pass in motor case (200) shaft hole (211), and enter into in the motor pump case (300), transmission shaft (100) with shaft hole (211) rotatable fit.

4. The motor oil pump according to claim 3, characterized in that:

the baffle plate part (210) is provided with an oil passing hole (212), and the position of the oil passing hole (212) corresponds to the gap (600), so that engine oil passes through the gap (600) and then enters the motor shell (200) through the oil passing hole (212).

5. The motor oil pump according to claim 3, characterized in that:

the surface of the baffle plate part (210) facing one side of the oil pump inner rotor (400) is provided with an oil storage groove (213), the edge of the oil storage groove (213) extends to lead out an oil guide groove (214), and the oil guide groove (214) is communicated with the shaft hole (211) and the oil storage groove (213).

6. The electric motor oil pump according to claim 1, characterized in that:

the motor casing (200) and the engine oil pump casing (300) are integrally formed.

7. The motor oil pump according to claim 1 or 6, characterized in that:

the lower end surfaces of the oil pump inner rotor (400) and the oil pump outer rotor (500) are flush with the lower end surface of the oil pump shell (300);

a lower end cover (700) is arranged on the lower end face of the engine oil pump shell (300);

an oil filling hole (710) is formed in the lower end cover (700), and the position of the oil filling hole (710) corresponds to the meshing surface of the oil pump inner rotor (400) and the oil pump outer rotor (500).

8. The motor oil pump of claim 7, wherein:

an oil discharge groove (720) is formed in the upper surface of the lower end cover (700) to discharge engine oil, one end of the oil discharge groove (720) is connected to the meshing surface of the engine oil inner rotor (400) and the engine oil outer rotor (500), and the other end of the oil discharge groove extends to the edge of the lower end cover (700).

9. The motor oil pump of claim 8, wherein:

an auxiliary oil groove (310) is formed in the lower end face of the engine oil pump shell (300), and the position of the auxiliary oil groove (310) corresponds to the position of the oil discharge groove (720).

10. The motor oil pump of claim 7, wherein: the oil filling hole (710) and the oil passing hole (212) are fan-shaped and are opposite in position.