WO2025199813A1 - 电动油泵 - Google Patents

电动油泵

Info

Publication number
WO2025199813A1
WO2025199813A1 PCT/CN2024/084152 CN2024084152W WO2025199813A1 WO 2025199813 A1 WO2025199813 A1 WO 2025199813A1 CN 2024084152 W CN2024084152 W CN 2024084152W WO 2025199813 A1 WO2025199813 A1 WO 2025199813A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
pump
electric oil
rotor assembly
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/084152
Other languages
English (en)
French (fr)
Inventor
袁利军
郭文萍
葛智
节少平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to PCT/CN2024/084152 priority Critical patent/WO2025199813A1/zh
Publication of WO2025199813A1 publication Critical patent/WO2025199813A1/zh
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00

Definitions

  • the present invention relates to the technical field of oil pumps, and in particular to an electric oil pump.
  • An oil pump is a device used to drive fluid flow and generate fluid pressure in mechanical systems.
  • oil pumps are commonly used to move the working fluid for cooling and lubrication.
  • These oil pumps are typically driven by an electric motor, hence the name electric oil pump.
  • the motor shaft is a rotating component with a long axial length, and usually needs to be supported in the housing by at least two bearings.
  • One of the bearings is arranged at the end of the drive motor away from the pump rotor assembly, and the other bearing is arranged between the drive motor and the pump rotor assembly.
  • a sufficiently large bearing spacing needs to be set between the two, which causes the axial size of the electric oil pump to increase.
  • the bearings used here are usually ball bearings, which are relatively large in size, further increasing the overall size of the electric oil pump.
  • ball bearings are expensive and their installation process is complicated: first, the ball bearings need to be installed at both ends of the motor shaft, and then the pump rotor assembly is installed. The pump rotor assembly and the motor shaft need to be interference fit. During the installation process, the bearings are subjected to eccentric force, which may damage the bearings, ultimately causing noise problems and shortening the service life of the electric oil pump.
  • the technical problem to be solved by the present invention is to provide an improved electric oil pump.
  • the pump includes a drive motor, a pump rotor assembly, and a housing.
  • the drive motor and pump rotor assembly are mounted in the housing.
  • the drive motor includes a coaxially torsionally connected rotor and motor shaft.
  • the rotor and pump rotor assembly are spaced axially apart, and the motor shaft axially passes through the rotor and pump rotor assembly in sequence.
  • the electric oil pump also includes a first bearing.
  • the motor shaft includes a first end that extends axially away from the rotor and extends from the pump rotor assembly.
  • the first end is rotatably supported on the housing via the first bearing.
  • the housing may include a main body and a pump head cover.
  • the main body may include a pump rotor cavity that is open axially away from the rotor and accommodates the pump rotor assembly.
  • the pump head cover may be fixed to the main body axially adjacent to the pump rotor assembly to thereby enclose the pump rotor cavity.
  • the first end of the pump head cover is rotatably supported on the pump head cover via a first bearing.
  • the space in the pump head cover may be utilized to mount the first bearing, thereby reducing the axial dimension of the main body.
  • the pump head cover may include an outer cylindrical portion and an inner cylindrical portion formed around the axial direction, the outer cylindrical portion being located radially outward from the inner cylindrical portion and including a radially outer surface for assembly to an external component, the first end being supported radially inward from the inner cylindrical portion, and the inner cylindrical portion may not extend axially away from the rotor beyond the outer cylindrical portion.
  • the axial dimension of the pump head cover is thus determined by the assembly requirements of the radially outer surface, and only the original axial dimension of the pump head cover is utilized to meet the installation space of the first bearing.
  • the axial dimension of the pump head cover does not need to be increased while reducing the axial dimension of the main body.
  • the first bearing and/or the second bearing can be connected to the housing in a rotationally fixed manner by a tooth fit, which enables the bearing to be fixed more stably in the circumferential direction relative to the housing.
  • the radial inner surface of the first bearing and/or the second bearing for sliding contact with the motor shaft may include a lubrication groove.
  • the lubrication groove may contain a working fluid to lubricate and cool the contact surface between the sliding bearing and the motor shaft, thereby reducing wear.
  • FIG1 shows a perspective cross-sectional view of an electric oil pump according to an exemplary embodiment of the present invention
  • FIG2 shows a detail of the section shown in FIG1 in the region of the first end of the motor shaft
  • FIG4 shows a schematic diagram of a bearing of an electric oil pump according to an exemplary embodiment of the present invention.
  • FIG5 is a schematic diagram illustrating a bearing of an electric oil pump according to another exemplary embodiment of the present invention.
  • an electric oil pump for driving a working fluid and generating fluid pressure.
  • Figures 1 to 4 illustrate an exemplary embodiment of the electric oil pump according to the present invention. The specific structure of the electric oil pump will be described below with reference to the accompanying drawings.
  • the drive motor 10 includes a stator 11, a rotor 12, and a motor shaft 13.
  • the stator 11 is fixed within a housing 30, while the rotor 12 is coaxially mounted radially inwardly of the stator 11 and is rotatable relative to the stator 11 about a central axis parallel to the axial direction.
  • the motor shaft 13 is coaxially connected to the rotor 12 in a torque-proof manner, specifically fixed radially inwardly of the rotor 12, thereby being rotatable relative to the stator 11 and the housing 30 along the common central axis.
  • the motor shaft 13 includes two axially opposing ends, namely a first end 13a and a second end 13b. These ends of the motor shaft 13 protrude axially beyond the rotor 12 to be supported by the housing 30.
  • the motor shaft 13 axially passes through the rotor 12 and the pump rotor assembly 20, with a first end 13a of the motor shaft 13 axially extending out of the pump rotor assembly 20 away from the rotor 12, while a second end 13b extends out of the rotor 12 axially away from the pump rotor assembly 20.
  • the first end 13a is axially located on the side of the pump rotor assembly 20 away from the stator 11 and rotor 12, while the second end 13b is axially located on the side of the rotor 12 away from the pump rotor assembly 20.
  • the motor shaft 13, which passes through the pump rotor assembly 20, is in driving connection with the pump rotor assembly 20.
  • the motor shaft 13 is used to transmit the driving torque generated by the drive motor 10 to the pump rotor assembly 20.
  • the pump rotor assembly 20 can be driven by the drive shaft 13 to generate pumping suction.
  • the pump rotor assembly 20 can be any pump device known in the art, such as a gear pump. The specific structure and operating principle of generating pumping suction are widely known and will not be detailed here, as they do not constitute limitations of the present invention.
  • FIG2 illustrates a detail of the cross section shown in FIG1 in the region of first end 13a of motor shaft 13.
  • the electric oil pump further includes a first bearing 40.
  • first bearing 40 Compared to the prior art, the position of first bearing 40 has been relocated from between rotor 12 and pump rotor assembly 20 to the outside of pump rotor assembly 20.
  • the housing 30 may include a main body 31, a pump head cover 32, and a controller cover 33.
  • the main body 31 is generally cylindrical around the central axis.
  • the motor cavity and the pump rotor cavity are basically formed in the main body.
  • the motor cavity and the pump rotor cavity are axially separated by a partition wall formed inside the main body 31 as shown in FIG1 .
  • the motor cavity is open axially away from the pump rotor assembly 20, and the controller cover 33 is fixed to the main body 31 at the open end of the motor cavity, thereby closing the motor cavity.
  • the pump rotor cavity is open axially away from the rotor 12, and the pump head cover 32 is fixed to the main body 31 at the open end of the pump rotor cavity, thereby closing the pump rotor cavity.
  • the pump head cover 32 is arranged axially adjacent to the pump rotor assembly 20, so that the pump head cover 32 and the partition wall axially constrain the pump rotor assembly 20, so that the pump rotor assembly 20 is substantially unable to move axially relative to the housing 30.
  • the first end 13a can be supported on the pump head cover 32 by the first bearing 40.
  • the pump head cover 32 may include an outer cylinder portion 32a and an inner cylinder portion 32b formed around the axial direction.
  • the outer cylinder portion 32a is located radially outside the inner cylinder portion 32b.
  • the space between the outer cylinder portion 32a and the inner cylinder portion 32b can constitute the high-pressure chamber and the low-pressure chamber of the pump rotor assembly 20.
  • the radial outer surface of the outer cylinder portion 32a can be used to assemble to external components (such as components that require pump suction provided by an electric oil pump).
  • the first bearing 40 can be various types of bearings, preferably a sliding bearing.
  • the first bearing 40 as a sliding bearing can be fixed to the inner cylinder portion 32b and slide in contact with the first end 13a of the motor shaft 13.
  • Figure 4 shows an exemplary structure of the first bearing 40, wherein the first bearing 40 has a smooth radial outer surface and can be fixed to the inner cylinder portion 32b of the pump head cover 32 by an interference fit.
  • Figure 5 shows another exemplary structure of the first bearing 40, wherein the first bearing 40 is formed with teeth on the radial outer surface, and correspondingly, teeth are also formed on the radial inner surface of the inner cylinder portion 32b, and the first bearing 40 can be connected to the inner cylinder portion 32b in a torsion-resistant manner by tooth fit.
  • the radial inner surface of the first bearing 40 for sliding contact with the motor shaft 13 may further include one or more lubrication grooves 41.
  • Each lubrication groove 41 is located relative to the first bearing 40.
  • the radial inner surface of the first bearing 40 is generally radially recessed.
  • Each lubrication groove 41 may also extend generally axially through the first bearing 40. When multiple lubrication grooves 41 are present, these lubrication grooves 41 may be spaced apart circumferentially, and in particular, evenly spaced apart.
  • Working fluid may enter and be stored in the lubrication grooves 41, thereby being distributed to the contact surface when the motor shaft 13 rotates relative to the first bearing 40, thereby reducing wear and heat generation.
  • the first bearing 40 is assembled to the housing 30 as a separate component.
  • the inner surface of the housing 30 can also serve as the first bearing 40, directly slidably supporting the first end 13a of the motor shaft 13. In other words, there is no need to install a separate bearing. This reduces the number of components and the number of additional assembly steps.
  • the second bearing 50 may also preferably be a sliding bearing.
  • the second bearing 50 as a sliding bearing can be fixed to the controller cover 33 and slide in contact with the second end 13b of the motor shaft 13.
  • the second bearing 50 may also adopt the structure shown in Figure 4 and be fixed to the controller cover 33 by an interference fit.
  • the second bearing 50 may also adopt the structure shown in Figure 5 and be torsionally connected to the controller cover 33 by a tooth fit.
  • the radial inner surface of the second bearing 50 for sliding contact with the motor shaft 13 may also include one or more lubrication grooves 51, each lubrication groove 41 being substantially radially recessed relative to the radial inner surface of the first bearing 40.
  • the inner surface of the housing 30 may also serve as the second bearing 50 to directly slide and support the second end 13b of the motor shaft 13, thereby eliminating the need for an independent second bearing.
  • the mounting position of the bearing near the pump rotor assembly is changed.
  • the motor shaft extends out of the pump rotor assembly, and the end of the motor shaft is supported on the housing via a first bearing. This reduces the axial distance between the drive motor rotor and the pump rotor assembly.
  • the space provided by the necessary axial dimension of the pump head cover for assembly can be used to accommodate the first bearing, eliminating the need for additional axial dimension. This significantly reduces the axial dimension of the entire electric oil pump.
  • the motor shaft is small, resulting in a more compact overall layout.
  • the two support points of the motor shaft are located at opposite axial ends, increasing the spacing between the support points and improving support stability.
  • the pump rotor assembly can be installed first, followed by the first bearing, simplifying the assembly process and reducing the risk of bearing damage during assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

一种电动油泵，包括驱动电机(10)、泵转子组件(20)和壳体(30)。驱动电机(10)和泵转子组件(20)安装在壳体(30)中。驱动电机(10)包括同轴地抗扭连接的转子(12)和电机轴(13)。转子(12)与泵转子组件(20)沿轴向间隔分布，电机轴(13)沿轴向依次穿过转子(12)和泵转子组件(20)。电动油泵还包括第一轴承(40)，电机轴(13)包括沿轴向背向转子(12)伸出泵转子组件(20)的第一端(13a)，第一端(13a)通过第一轴承(40)可转动地支撑在壳体(30)上。该电动油泵可缩小尺寸，安装方便，稳定可靠。

Description

电动油泵 技术领域
本发明涉及油泵技术领域。具体地，本发明涉及一种电动油泵。
背景技术
油泵是用于在机械系统中驱动流体流动和产生流体压力的装置。例如，在当前的机动车辆中通常使用油泵来驱动用于冷却和润滑的工作流体。这种油泵通常由电机驱动，因此称为电动油泵。
CN 116529487 A公开了一种具有典型构造的电动油泵。这种电动油泵包括驱动电机、泵转子组件和壳体等部件。驱动电机和泵转子组件安装在壳体中的不同腔室内并且沿轴向布置。驱动电机的电机轴与泵转子组件传动连接以向泵转子组件输出驱动扭矩。泵转子组件转动从而产生泵吸力。
在现有技术中，电机轴是具有较长轴向长度的转动部件，通常需要通过至少两个轴承来支撑在壳体内。其中一个轴承布置在驱动电机的远离泵转子组件的一端，而另一个轴承布置在驱动电机与泵转子组件之间。为了在驱动电机与泵转子组件之间安装轴承，需要在这两者之间设置足够大的轴承间距，因此造成电动油泵的轴向尺寸增大。而且，这里所使用的轴承通常是球轴承，球轴承自身的尺寸较大，进一步增加了电动油泵的整体尺寸。同时，球轴承成本较高，并且其安装工艺复杂：首先需要将球轴承安装在电机轴的两端，然后安装泵转子组件，泵转子组件与电机轴需要过盈配合，在安装过程中，轴承承受偏心力，有可能损坏轴承，最终导致噪声问题并且缩短电动油泵的使用寿命。
发明内容
因此，本发明需要解决的技术问题是，提供一种改进的电动油泵。
上述技术问题通过根据本发明的一种电动油泵而得到解决。该电动油 泵包括驱动电机、泵转子组件和壳体，驱动电机和泵转子组件安装在壳体中，驱动电机包括同轴地抗扭连接的转子和电机轴，转子与泵转子组件沿轴向间隔分布，电机轴沿轴向依次穿过转子和泵转子组件。其中，该电动油泵还包括第一轴承，电机轴包括沿轴向背向转子伸出泵转子组件的第一端，第一端通过第一轴承可转动地支撑在壳体上。通过改变靠近泵转子组件的轴承相对于电机轴的支撑位置，使得可以利用位于泵转子组件的轴向外侧的空间来安装第一轴承，由此可以减小电动油泵的轴向尺寸，提高结构紧凑性。
根据本发明的一个优选实施例，壳体可以包括主体部和泵头盖，主体部可以包括沿轴向背向转子开放并且容纳泵转子组件的泵转子腔，泵头盖可以沿轴向与泵转子组件相邻地固定到主体部从而封闭泵转子腔，第一端通过第一轴承可转动地支撑在泵头盖上。由此可以利用泵头盖中的空间来安装第一轴承，主体部的轴向尺寸可以减小。
根据本发明的另一优选实施例，泵头盖可以包括环绕轴向方向形成的外筒部和内筒部，外筒部位于内筒部的径向外侧并且包括用于装配到外部部件的径向外表面，第一端支撑在内筒部的径向内侧，内筒部可以不沿轴向背向转子伸出外筒部。泵头盖的轴向尺寸由此由径向外表面的装配需要来确定，仅利用泵头盖原有的轴向尺寸来满足第一轴承的安装空间，在减小主体部的轴向尺寸的同时不需要增加泵头盖的轴向尺寸。
根据本发明的另一优选实施例，电机轴还可以包括与第一端沿轴向相对的第二端，电动油泵还可以包括第二轴承，第二端沿轴向背向泵转子组件伸出转子并且通过第二轴承可转动地支撑在壳体上。电机轴由此在轴向两端处分别支撑在壳体上，两个支撑点之间的间距较大，从而可以更稳定地支撑电机轴。
根据本发明的另一优选实施例，第一轴承和/或第二轴承可以是滑动轴承。滑动轴承比球轴承结构更简单并且尺寸更小，由此可以节省安装空间，同时滑动轴承比球轴承成本更低并且更易于安装。
根据本发明的另一优选实施例，第一轴承和/或第二轴承可以通过过盈配合固定到壳体。由此轴承可以具有简单的结构和安装方式。
根据本发明的另一优选实施例，第一轴承和/或第二轴承可以通过齿配合抗扭连接到壳体。这使得轴承相对于壳体在周向上更稳定地固定。
根据本发明的另一优选实施例，壳体的内表面可以作为第一轴承和/或第二轴承直接滑动支撑电机轴。也就是说，可以直接通过壳体的内表面来支撑电机轴，由此可以免除独立的轴承部件，从而节省了生产和安装成本。
根据本发明的另一优选实施例，第一轴承和/或第二轴承的用于滑动接触电机轴的径向内表面可以包括润滑槽。润滑槽可以容纳工作流体来润滑和冷却滑动轴承与电机轴的接触表面，从而减少磨损。
附图说明
以下结合附图进一步描述本发明。图中以相同的附图标记来代表功能相同的元件。其中：
图1示出根据本发明的示例性实施例的电动油泵的立体剖视图；
图2示出图1所示的剖面在电机轴的第一端的区域中的细节图；
图3示出根据本发明的示例性实施例的电动油泵的电机轴的支撑结构的剖视图；
图4示出根据本发明的一个示例性实施例的电动油泵的轴承的示意图；和
图5示出根据本发明的另一示例性实施例的电动油泵的轴承的示意图。
具体实施方式
以下将结合附图描述根据本发明的电动油泵的具体实施方式。下面的详细描述和附图用于示例性地说明本发明的原理，本发明不限于所描述的优选实施例，本发明的保护范围由权利要求书限定。
根据本发明的实施例，提供了一种用于驱动工作流体和产生流体压力的电动油泵。图1至图4示出了根据本发明的电动油泵的一个示例性实施例。下面结合附图来说明这种电动油泵的具体结构。
图1示出了根据示例性实施例的电动油泵的立体剖视图。如图1所示，这种电动油泵主要包括驱动电机10、泵转子组件20和壳体30。驱动电机 10和泵转子组件20安装在壳体30中。
驱动电机10包括定子11、转子12和电机轴13。定子11固定在壳体30内，转子12同轴地安装在定子11的径向内侧并且能够围绕平行于轴向方向的中心轴线相对于定子11转动。电机轴13与转子12同轴地抗扭连接、特别是固定在转子12的径向内侧，从而能够随着转子12围绕共同的中心轴线相对于定子11及壳体30转动。电机轴13包括沿轴向相对的两个端部，即第一端13a和第二端13b。电机轴13的这两端分别沿轴向突出到转子12之外以支撑在壳体30上。
驱动电机10的定子11和转子12与泵转子组件20沿轴向间隔分布，并且分别容纳在壳体30的两个不同的腔室中。其中，容纳定子11和转子12的腔室可以称为电机腔，而容纳泵转子组件20的腔室可以称为泵转子腔。电机腔与泵转子腔由壳体30中的分隔壁在轴向上分隔开。电机轴13沿轴向依次穿过转子12和泵转子组件20，电机轴13的第一端13a沿轴向背向转子12伸出泵转子组件20，而第二端13b沿轴向背向泵转子组件20伸出转子12。换句话说，第一端13a在轴向上位于泵转子组件20的远离定子11和转子12的一侧，而第二端13b在轴向上位于转子12的远离泵转子组件20的一侧。
穿过泵转子组件20的电机轴13与泵转子组件20传动连接。电机轴13用于将驱动电机10产生的驱动扭矩传递到泵转子组件20。泵转子组件20能够由驱动轴13驱动来产生泵吸力。泵转子组件20可以是现有技术中已知的各种泵装置，例如齿轮泵，其具体结构和产生泵吸力的工作原理是广泛已知的，在此不再赘述并且不构成对本发明的限制。
图2示出了图1所示的剖面在电机轴13的第一端13a的区域中的细节。如图2所示，电动油泵还包括第一轴承40，电机轴13的伸出泵转子组件20之外的第一端13a通过第一轴承40可转动地支撑在壳体30上。相对于现有技术，第一轴承40的位置从转子12与泵转子组件20之间转移到了泵转子组件20的外侧。
具体地，壳体30可以包括主体部31、泵头盖32和控制器盖33。主体部31大致呈围绕中心轴线的圆筒状。电机腔和泵转子腔都基本形成在主体 部31中。如图1所示，电机腔与泵转子腔由形成在主体部31内部的分隔壁在轴向上分隔开。电机腔沿轴向背向泵转子组件20开放，控制器盖33在电机腔的开放端固定到主体部31，从而封闭电机腔。泵转子腔沿轴向背向转子12开放，泵头盖32在泵转子腔的开放端固定到主体部31从而封闭泵转子腔，同时，泵头盖32沿轴向与泵转子组件20相邻地布置，使得泵头盖32与分隔板在轴向上约束泵转子组件20，因此泵转子组件20基本不能在轴向上相对于壳体30移动。
这里，第一端13a可以通过第一轴承40支撑在泵头盖32上。具体地，如图2所示，泵头盖32可以包括环绕轴向方向形成的外筒部32a和内筒部32b。外筒部32a位于内筒部32b的径向外侧。外筒部32a与内筒部32b之间的空间可以构成泵转子组件20的高压腔和低压腔。外筒部32a的径向外表面可以用于装配到外部部件(例如需要由电动油泵提供泵吸力的部件)。内筒部32b朝向泵转子组件20的一端开放，背向泵转子组件20的另一端封闭。第一端13a从内筒部32b的开放端插入内筒部32b中并且通过第一轴承40支撑在内筒部32b的径向内侧。由于外筒部32a的径向外表面的装配需要，外筒部32a需要具有一定的轴向长度，因此泵头盖23的轴向尺寸必然不能小于外筒部32a的轴向长度。因此，可以利用这个尺寸来提供容纳第一轴承40的空间，从而避免占用主体部31内的空间。优选地，内筒部32b可以不沿轴向背向转子12伸出外筒部32a，使得泵头盖23的整体轴向尺寸仅取决于外筒部32a。
第一轴承40可以是各种类型的轴承，优选地可以是滑动轴承。作为滑动轴承的第一轴承40可以固定到内筒部32b上，并且滑动接触电机轴13的第一端13a。例如，图4示出了第一轴承40的一种示例性结构，其中第一轴承40具有光滑的径向外表面，并且可以通过过盈配合固定到泵头盖32的内筒部32b。又例如，图5示出了第一轴承40的另一种示例性结构，其中第一轴承40在径向外表面上形成有齿，对应地在内筒部32b的径向内表面上也形成有齿，第一轴承40可以通过齿配合抗扭连接到内筒部32b。
此外，如图5所示，第一轴承40的用于滑动接触电机轴13的径向内表面还可以包括一个或多个润滑槽41。每个润滑槽41相对于第一轴承40 的径向内表面大致沿径向凹入。每个润滑槽41还可以大致沿轴向贯穿第一轴承40。当存在多个润滑槽41时，这些润滑槽41可以沿周向间隔分布，特别是均匀地间隔分布。工作流体可以进入并且存储在润滑槽41中，从而在电机轴13相对于第一轴承40转动时分布到接触表面上，以便减少磨损和生热。
在图4和图5所示的实施例中，第一轴承40都是作为独立部件组装到壳体30的。在替代的实施例中，壳体30的内表面也可以作为第一轴承40直接滑动支撑电机轴13的第一端13a。也就是说，不需要安装独立的轴承。这意味着可以减少部件的数量和额外的组装步骤。
优选地，电动油泵还可以包括第二轴承50。电机轴13的第二端13b可以通过第二轴承50可转动地支撑在壳体30上。例如，第二端13b可以通过第二轴承50支撑在控制器盖33上。图3示出了在这种情况下电机轴13的支撑结构的剖视图。如图3所示，电机轴13此时通过两个轴承分别在轴向两端支撑在壳体30上。这使得电机轴13的两个支撑点之间的轴向距离更长，由此获得更高的支撑稳定性。
类似于第一轴承40，第二轴承50优选地也可以是滑动轴承。作为滑动轴承的第二轴承50可以固定到控制器盖33，并且滑动接触电机轴13的第二端13b。第二轴承50也可以采用图4所示的结构，通过过盈配合固定到控制器盖33。或者，第二轴承50也可以采用图5所示的结构，通过齿配合抗扭连接到控制器盖33。同样，第二轴承50的用于滑动接触电机轴13的径向内表面也可以包括一个或多个润滑槽51，每个润滑槽41相对于第一轴承40的径向内表面大致沿径向凹入。替代地，壳体30的内表面也可以作为第二轴承50直接滑动支撑电机轴13的第二端13b，从而不需要设置独立的第二轴承。
在根据本发明的电动油泵中，改变了靠近泵转子组件的轴承的安装位置。电机轴伸出泵转子组件，电机轴的端部通过第一轴承支撑在壳体上。这使得驱动电机的转子与泵转子组件之间的轴向间距可以缩小。同时，可以利用泵头盖上用于装配的必要轴向尺寸所提供的空间来容纳第一轴承，因此不需要额外增加的轴向尺寸。这使得整个电动油泵的轴向尺寸显著减 小，整体布局更加紧凑。同时，电机轴的两个支撑点位于电机轴的轴向两端，使得支撑点的间距增大，提高了支撑稳定性。可以使用结构简单且成本低廉的滑动轴承来支撑电机轴，从而有效节省生产成本。此外，由于第一轴承位于泵转子组件的外侧，在组装时可以首先安装泵转子组件，然后安装第一轴承，使得组装过程更简单，并且在组装过程中不易损坏轴承。
虽然在上述说明中示例性地描述了可能的实施例，但是应当理解到，仍然通过所有已知的和此外技术人员容易想到的技术特征和实施方式的组合存在大量实施例的变化。此外还应该理解到，示例性的实施方式仅仅作为一个例子，这种实施例绝不以任何形式限制本发明的保护范围、应用和构造。通过前述说明更多地是向技术人员提供一种用于转化至少一个示例性实施方式的技术指导，其中，只要不脱离权利要求书的保护范围，便可以进行各种改变，尤其是关于所述部件的功能和结构方面的改变。
附图标记表
10 驱动电机
11 定子
12 转子
13 电机轴
13a 第一端
13b 第二端
20 泵转子组件
30 壳体
31 主体部
32 泵头盖
32a 外筒部
32b 内筒部
33 控制器盖
40 第一轴承
41 润滑槽
50 第二轴承
51 润滑槽

Claims (9)

  1. 一种电动油泵，包括驱动电机(10)、泵转子组件(20)和壳体(30)，所述驱动电机(10)和所述泵转子组件(20)安装在所述壳体(30)中，所述驱动电机(10)包括同轴地抗扭连接的转子(12)和电机轴(13)，所述转子(12)与所述泵转子组件(20)沿轴向间隔分布，所述电机轴(13)沿轴向依次穿过所述转子(12)和所述泵转子组件(20)，
    其特征在于，
    所述电动油泵还包括第一轴承(40)，所述电机轴(13)包括沿轴向背向所述转子(12)伸出所述泵转子组件(20)的第一端(13a)，所述第一端(13a)通过所述第一轴承(40)可转动地支撑在所述壳体(30)上。
  2. 根据权利要求1所述的电动油泵，其特征在于，所述壳体(30)包括主体部(31)和泵头盖(32)，所述主体部(31)包括沿轴向背向所述转子(12)开放并且容纳所述泵转子组件(20)的泵转子腔，所述泵头盖(32)沿轴向与所述泵转子组件(20)相邻地固定到所述主体部(31)从而封闭所述泵转子腔，所述第一端(13a)通过所述第一轴承(40)可转动地支撑在所述泵头盖(32)上。
  3. 根据权利要求2所述的电动油泵，所述泵头盖(32)包括环绕轴向方向形成的外筒部(32a)和内筒部(32b)，所述外筒部(32a)位于所述内筒部(32b)的径向外侧并且包括用于装配到外部部件的径向外表面，所述第一端(13a)支撑在所述内筒部(32b)的径向内侧，所述内筒部(32b)不沿轴向背向所述转子(12)伸出所述外筒部(32a)。
  4. 根据权利要求1至3中任一项所述的电动油泵，其特征在于，所述电机轴(13)还包括与所述第一端(13a)沿轴向相对的第二端(13b)，所述电动油泵还包括第二轴承(50)，所述第二端(13b)沿轴向背向所述泵转子组件(20)伸出所述转子(12)并且通过所述第二轴承(50)可转动地支撑在所述壳体(30)上。
  5. 根据权利要求4所述的电动油泵，其特征在于，所述第一轴承(40) 和/或所述第二轴承(50)是滑动轴承。
  6. 根据权利要求5所述的电动油泵，其特征在于，所述第一轴承(40)和/或所述第二轴承(50)通过过盈配合固定到所述壳体(30)。
  7. 根据权利要求5所述的电动油泵，其特征在于，所述第一轴承(40)和/或所述第二轴承(50)通过齿配合抗扭连接到所述壳体(30)。
  8. 根据权利要求5所述的电动油泵，其特征在于，所述壳体(30)的内表面作为所述第一轴承(40)和/或所述第二轴承(50)直接滑动支撑所述电机轴(13)。
  9. 根据权利要求5所述的电动油泵，其特征在于，所述第一轴承(40)和/或所述第二轴承(50)的用于滑动接触所述电机轴(13)的径向内表面包括润滑槽(41、51)。
PCT/CN2024/084152 2024-03-27 2024-03-27 电动油泵 Pending WO2025199813A1 (zh)

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CN105782063A (zh) * 2014-12-22 2016-07-20 杭州三花研究院有限公司 电驱动泵
US20200300241A1 (en) * 2017-08-31 2020-09-24 Hangzhou Sanhua Research Institute Co., Ltd. Electric oil pump
CN111934485A (zh) * 2020-07-15 2020-11-13 浙江睿驰同利汽车电子有限公司 一种电子油泵
CN114320881A (zh) * 2020-09-30 2022-04-12 常州嵘驰发动机技术有限公司 电动机油泵

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160076539A1 (en) * 2014-03-04 2016-03-17 Hitachi Automotive Systems, Ltd. Electric Oil Pump
CN105782063A (zh) * 2014-12-22 2016-07-20 杭州三花研究院有限公司 电驱动泵
US20200300241A1 (en) * 2017-08-31 2020-09-24 Hangzhou Sanhua Research Institute Co., Ltd. Electric oil pump
CN111934485A (zh) * 2020-07-15 2020-11-13 浙江睿驰同利汽车电子有限公司 一种电子油泵
CN114320881A (zh) * 2020-09-30 2022-04-12 常州嵘驰发动机技术有限公司 电动机油泵

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