阅读说明：本技术 一种高容积效率的电子油泵 (Electronic oil pump with high volume efficiency ) 是由 徐杰 夏水晶 张琳 于 2021-01-06 设计创作，主要内容包括：本发明提供一种高容积效率的电子油泵,包括泵体、可转动地支撑在泵体中的泵轴、以及由泵轴驱动转动的转子组件,泵体包括固定相连的第一泵体和第二泵体,第一泵体和第二泵体为两个独立部件,第二泵体中开设有容置转子组件的转子腔体,第二泵体的材料和转子组件的材料相同、都为粉末冶金材料。本申请中,将泵体设置成分体结构、由相互独立的第一泵体和第二泵体构成,第二泵体的热变形系数和转子组件的热变形系数相同,故在高温、以及使用低粘度机油的情况下,电子油泵的端面间隙不会增大,由此大大提高电子油泵的容积效率和性能,减小电子油泵的排量设计,从而降低电子油泵的功耗,达到节能减排的目的。(The invention provides an electronic oil pump with high volume efficiency, which comprises a pump body, a pump shaft and a rotor assembly, wherein the pump shaft is rotatably supported in the pump body, the rotor assembly is driven by the pump shaft to rotate, the pump body comprises a first pump body and a second pump body which are fixedly connected, the first pump body and the second pump body are two independent parts, a rotor cavity for accommodating the rotor assembly is arranged in the second pump body, and the material of the second pump body is the same as that of the rotor assembly and is made of powder metallurgy materials. In this application, set up the pump body into components of a whole that can function independently structure, constitute by the first pump body and the second pump body of mutual independence, the thermal deformation coefficient of the second pump body is the same with the thermal deformation coefficient of rotor subassembly, so under the condition of high temperature and use low viscosity machine oil, the terminal surface clearance of electron oil pump can not increase, improves the volumetric efficiency and the performance of electron oil pump from this greatly, reduces the discharge capacity design of electron oil pump to reduce the consumption of electron oil pump, reach energy saving and emission reduction's purpose.)

1. A high volumetric efficiency electronic oil pump comprising a pump body, a pump shaft (10) rotatably supported in the pump body, and a rotor assembly (20) driven in rotation by the pump shaft (10), characterized in that: the pump body includes fixed first pump body (30) and the second pump body (40) that link to each other, first pump body (30) and second pump body (40) are two independent parts, set up the rotor cavity who holds rotor subassembly (20) in the second pump body (40), the material of second pump body (40) and the material of rotor subassembly (20) are the same, all are the powder metallurgy material.

2. The electronic oil pump of claim 1, wherein: the first pump body (30) is made of aluminum alloy materials.

3. The electronic oil pump of claim 1, wherein: the second pump body (40) is provided with a heat dissipation hole (41).

4. The electronic oil pump of claim 1, wherein: the rotor assembly (20) comprises an inner rotor (21) in interference fit with the pump shaft (10), an outer rotor (22) in clearance fit with the inner rotor (21), and a working cavity (23) formed between the inner rotor (21) and the outer rotor (22).

5. The electronic oil pump according to claim 4, characterized in that: the outer periphery of the inner rotor (21) is provided with a plurality of rotor tooth parts (211) matched with the outer rotor (22), a concave cavity (212) is formed between every two adjacent rotor tooth parts (211) of the inner rotor (21), and the concave cavity (212) is located at the root of each rotor tooth part (211) and is communicated with the working cavity (23).

6. The electronic oil pump according to claim 4, characterized in that: the oil-gas pump further comprises a motor for driving the pump shaft (10) to rotate, the first pump body (30) is provided with a coil cavity (31) for accommodating a coil part in the motor, a top cover part (32) arranged at the top of the coil cavity (31) and an oil hole (33) formed in the top cover part (32), the working cavity (23) of the rotor assembly (20) comprises an oil suction cavity and an oil discharge cavity, and the oil hole (33) is formed in the side of the oil suction cavity and communicates the oil suction cavity with the coil cavity (31).

7. The electronic oil pump of claim 1, wherein: the pump body is characterized by further comprising a pump top cover (60) arranged at the end part of the second pump body (40) far away from the first pump body (30), and the first pump body (30), the second pump body (40) and the pump top cover (60) are fixedly connected through a plurality of bolts.

Technical Field

The invention relates to the field of oil pumps, in particular to an electronic oil pump with high volumetric efficiency.

Background

The electronic oil pump is a common oil pump and mainly comprises a motor, a pump shaft driven by a brush motor or a brushless motor to rotate, a rotor assembly connected with the pump shaft and a pump body, wherein a rotor chamber for accommodating the rotor assembly is arranged in the pump body; meanwhile, the pump body is an integrally formed part and is made of an aluminum alloy material. At normal temperature, the volumetric efficiency of the electronic oil pump is good, and when the temperature of the lubricating oil or the cooling medium rises and low-viscosity oil is used, the pump body (especially the part of the pump body forming the rotor chamber) expands due to heat, so that the end face clearance of the electronic oil pump is enlarged, and the volumetric efficiency of the pump is greatly reduced, which is more prominent under the condition that the use environment is low-viscosity oil (such as 0W12 and 0W 16). The reduction in volumetric efficiency of the pump can result in a reduction in overall efficiency and ultimately a loss of power consumption from the engine gearbox or the electric vehicle power source. Therefore, under the conditions of high temperature and low-viscosity engine oil, the traditional electronic oil pump has to increase the discharge capacity design of the electronic oil pump or increase the rotating speed to supplement the pressure requirement of a lubricating system, so that the electronic oil pump does not meet the requirements of energy conservation and emission reduction.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides an electronic oil pump with high volumetric efficiency, which can improve volumetric efficiency and reduce displacement.

In order to achieve the above object, the present invention provides an electronic oil pump with high volumetric efficiency, which includes a pump body, a pump shaft rotatably supported in the pump body, and a rotor assembly driven by the pump shaft to rotate, wherein the pump body includes a first pump body and a second pump body fixedly connected to each other, the first pump body and the second pump body are two independent components, a rotor cavity for accommodating the rotor assembly is formed in the second pump body, and the second pump body is made of a powder metallurgy material, which is the same as the rotor assembly.

Further, the first pump body is made of an aluminum alloy material.

Further, a heat dissipation hole is formed in the second pump body; through seting up the louvre, can derive the heat in the pump body effectively, improve the thermal reliability of electron oil pump, can compromise the heat dissipation demand when improving the volumetric efficiency from this.

Further, the rotor assembly includes an inner rotor in interference fit with the pump shaft, an outer rotor in clearance fit with the inner rotor, and a working cavity formed between the inner rotor and the outer rotor.

Furthermore, the periphery of the inner rotor is provided with a plurality of rotor tooth parts matched with the outer rotor, the inner rotor is provided with a concave cavity between every two adjacent rotor tooth parts, the concave cavity is positioned at the root of the rotor tooth parts and is communicated with the working cavity, pressure pulsation can be reduced through the concave cavity, and the overall NVH capacity is improved.

Further, the electronic oil pump further comprises a motor for driving the pump shaft to rotate, the first pump body is provided with a coil cavity for accommodating a coil part in the motor, a top cover part arranged at the top of the coil cavity and an oil hole formed in the top cover part, the working cavity of the rotor assembly comprises an oil suction cavity and an oil discharge cavity, and the oil hole is formed in the side of the oil suction cavity and used for communicating the oil suction cavity with the coil cavity.

Further, the pump body still includes the pump top cap that sets up and keep away from first pump body tip department at the second pump body, pass through several bolt fastening between the first pump body, the second pump body and the pump top cap and link to each other.

As described above, the electronic oil pump according to the present invention has the following advantages:

in this application, set the pump body into components of a whole that can function independently structure, constitute by the first pump body and the second pump body of mutual independence, and the material of the second pump body is the same with the material of rotor subassembly, all be powder metallurgy material, make the thermal deformation coefficient of the second pump body and the thermal deformation coefficient of rotor subassembly the same, so at high temperature, and use under the condition of low viscosity machine oil, the terminal surface clearance of electronic oil pump can not increase, improve the volumetric efficiency and the performance of electronic oil pump greatly from this, reduce the discharge capacity design of electronic oil pump, thereby reduce the consumption of electronic oil pump, reach energy saving and emission reduction's purpose.

Drawings

Fig. 1 is a schematic structural diagram of an electronic oil pump in the present application.

Fig. 2 is a schematic structural view of fig. 1 without a pump top cover.

Fig. 3 is a schematic structural view of a rotor assembly according to the present application.

Fig. 4 is a side view of fig. 3.

Fig. 5 and 6 are schematic structural views of the first pump body at different viewing angles in the present application.

Description of the element reference numerals

10 pump shaft

20 rotor assembly

21 inner rotor

211 rotor tooth

212 cavity

22 outer rotor

23 working chamber

30 first pump body

31 coil chamber

32 top cover part

33 oil hole

40 second Pump body

41 heat dissipation hole

50 pump bottom cover

60 Pump top cover

70 connector unit

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.

As shown in fig. 1 and 2, the present invention provides a high volumetric efficiency electronic oil pump, which includes a pump body, a pump shaft 10 rotatably supported in the pump body through a bearing, and a rotor assembly 20 driven by the pump shaft 10 to rotate, the pump body includes a first pump body 30 and a second pump body 40 fixedly connected to each other, the first pump body 30 and the second pump body 40 are two independent components, a rotor cavity for accommodating the rotor assembly 20 is formed in the second pump body 40, and the second pump body 40 is made of a powder metallurgy material, which is the same as the rotor assembly 20.

In the electronic oil pump, the electronic oil pump further comprises a motor for driving the pump shaft 10 to rotate and a control board in communication connection with the motor; the control panel sends the instruction to the motor, the operation of control motor, and the pump shaft 10 is driven to rotate when the motor rotates, and pump shaft 10 drives rotor subassembly 20 and rotates, inhales oil and arranges oil. Particularly, the pump body is arranged to be a split structure, the pump body is composed of a first pump body 30 and a second pump body 40 which are independent of each other, materials of the second pump body 40 and materials of the rotor assembly 20 are the same and are powder metallurgy materials, so that the thermal deformation coefficient of the second pump body 40 is the same as that of the rotor assembly 20, and therefore under the conditions of high temperature and low-viscosity engine oil usage, the end face gap of the electronic oil pump cannot be increased, the volumetric efficiency and performance of the electronic oil pump are greatly improved, the discharge capacity design of the electronic oil pump is reduced, the power consumption of the electronic oil pump is reduced, and the purposes of energy conservation and emission reduction are achieved. After the volume efficiency and the performance of the electronic oil pump are greatly improved, the efficiency of the hydraulic system is improved. Meanwhile, under the same set condition, due to the improvement of the volume efficiency, the rotating speed of the motor in operation can be reduced, the relative energy consumption is reduced, and the energy consumption of the whole vehicle is also reduced.

As shown in fig. 1, the electronic oil pump further includes a pump bottom cover 50 fixedly connected to an end of the first pump body 30 away from the second pump body 40, and a pump top cover 60 fixedly connected to an end of the second pump body 40 away from the first pump body 30, where the pump top cover 60 is also an oil suction cover. The end face clearance of the electronic oil pump is as follows: the bottom end face of the pump bottom cover 50 is used as a reference surface, the sum of the axial lengths of the pump bottom cover 50 after the pump bottom cover 50, the first pump body 30 and the second pump body 40 are fixedly connected is H1, the height of the rotor assembly 20 from the reference surface is H2, and the difference between H1 and H2 is the end face gap of the electronic oil pump.

Further, the material of the first pump body 30 is an aluminum alloy material. The first pump body 30 is an integrally formed member, and the second pump body 40 is also an integrally formed member. The first pump body 30, the second pump body 40 and the pump top cover 60 are fixedly connected through a plurality of bolts. Meanwhile, as shown in fig. 2, the end surface of the second pump body 40 facing away from the first pump body 30 is provided with heat dissipation holes 41, and the heat dissipation holes 41 can effectively dissipate part of the heat through more heat dissipation areas, thereby reducing the thermal deformation coefficient of the second pump body 40, reducing the temperature of the rotor part inside the second pump body 40, and prolonging the service life of the rotor part. Meanwhile, the heat dissipation holes 41 can also reduce the temperature of the motor and the control panel inside the pump body, and the thermal reliability of the electronic oil pump is improved, so that the volume efficiency is improved, and the heat dissipation requirement can be met.

Further, the pump bottom cover 50 is made of an aluminum alloy material or engineering plastic, the pump bottom cover 50 and the first pump body 30 are fixedly connected through a plurality of bolts, and a casing of the motor is fixed on the pump bottom cover 50, preferably, the casing of the motor and the pump bottom cover 50 can be of an integrally formed structure; the control panel is secured within the pump bottom cover 50. As shown in fig. 1, the outer peripheral surface of the pump bottom cover 50 is further provided with a connector unit 70, and the connector unit 70 includes an insulating housing made of plastic, and contacts, such as PIN PINs, embedded in the insulating housing and connected to the control board, for transmitting electrical signals or power through the connector unit 70.

Further, as shown in fig. 3 and 4, the rotor assembly 20 includes an inner rotor 21 interference-fitted with the pump shaft 10, an outer rotor 22 clearance-fitted with the inner rotor 21, and a working chamber 23 formed between the inner rotor 21 and the outer rotor 22, and half of the working chamber 23 is an oil suction chamber and the other half is an oil discharge chamber. Specifically, the outer periphery of the inner rotor 21 is provided with a plurality of rotor teeth 211 which are matched with the outer rotor 22, the inner rotor 21 is provided with a cavity 212 between two adjacent rotor teeth 211, and the cavity 212 is positioned at the root of the rotor teeth 211 and is communicated with the working cavity 23. In the electronic oil pump working process, the volume of inhaling the oil chamber changes from small to big, and the volume of oil extraction chamber changes from big to small, inhales the oil intracavity and produces high pressure, can produce the noise when high pressure lasts the enhancement, and the setting up of cavity 212 can increase the space of inhaling the oil chamber relatively, shortens the duration that inhales the oil intracavity and produce high pressure, has given more spaces and has removed the oil extraction for inhaling the oil chamber, reduces the oil trapping from this and improves the noise, promotes the performance of electronic oil pump.

Further, as shown in fig. 5 and 6, the first pump body 30 has a coil chamber 31 for accommodating a coil portion of the motor, and a top cover portion 32 disposed at the top of the coil chamber 31, that is, the top cover portion 32 is disposed at a side of the first pump body 30 close to the rotor assembly 20, and the top cover portion 32 is located at the bottom of the rotor assembly 20; the top cover portion 32 is opened with a through oil hole 33, and the oil hole 33 is located on the oil suction chamber side of the rotor assembly 20 and communicates the oil suction chamber of the rotor assembly 20 with the coil chamber 31 of the first pump body 30. Therefore, in the static state of the electronic oil pump, the engine oil in the oil suction chamber flows into the coil chamber 31 through the oil hole 33 on the top cover part 32; under the developments, the oil absorption chamber produces the negative pressure because volume change to with the machine oil suction in the coil cavity 31, so circulation, the machine oil that is sucked in the coil cavity 31 can take away the heat that motor and control panel produced, finally discharges through the oil extraction chamber, plays the effect of cooling from this, thereby the life of extension motor. In addition, the control board is fixed in the pump bottom cover 50, and a sealing structure is provided between the pump bottom cover 50 and the first pump body 30 to prevent the engine oil in the coil chamber 31 from flowing into the pump bottom cover 50.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.