WO2025199860A1 - 电动油泵 - Google Patents
电动油泵Info
- Publication number
- WO2025199860A1 WO2025199860A1 PCT/CN2024/084384 CN2024084384W WO2025199860A1 WO 2025199860 A1 WO2025199860 A1 WO 2025199860A1 CN 2024084384 W CN2024084384 W CN 2024084384W WO 2025199860 A1 WO2025199860 A1 WO 2025199860A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- motor
- connecting portion
- pump
- motor shaft
- 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
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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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 a drive motor, hence the name electric oil pump.
- An electric oil pump typically consists of a drive motor, a pump rotor assembly, and a housing.
- the drive motor rotates the pump rotor assembly, generating pump suction.
- the drive motor and the pump rotor assembly are housed in separate chambers within the housing.
- the motor chamber housing the drive motor typically requires oil for cooling and lubrication.
- CN 216741978 U discloses an electric oil pump, which connects the motor cavity of the electric oil pump with the high-pressure cavity and the low-pressure cavity of the pump rotor assembly respectively, so that the engine oil first enters the motor cavity from the high-pressure cavity under the action of oil pressure, circulates in the motor cavity, and then returns to the low-pressure cavity, thereby realizing cooling of the drive motor.
- FIG. 5 shows a detailed view of a first end of a motor shaft to which an electric oil pump according to an exemplary embodiment of the present invention is applied.
- FIG 1 shows a perspective cross-sectional view of an electric oil pump according to an exemplary embodiment.
- the electric oil pump mainly includes a drive motor 10, a pump rotor assembly 20, and a housing 30.
- the drive motor 10 and the pump rotor assembly 20 are installed in the housing 30.
- the motor shaft 13 includes an oil introduction hole 14 extending substantially axially.
- Oil introduction hole 14 extends from the axial end surface of the first end 13a of the motor shaft 13 to the axial end surface of the second end 13b, axially penetrating the motor shaft 13 and communicating with the motor chamber Cm via an opening at the second end 13b.
- the opening of the oil introduction hole 14 at the first end 13a communicates with a chamber containing engine oil.
- the electric oil pump also includes a propeller assembly 40.
- the propeller assembly 40 is fixedly mounted in the oil inlet hole 14, enabling it to generate a pumping force into the motor cavity Cm as the motor shaft 13 rotates relative to the housing 30.
- This propeller assembly 40 is similar to a common fan or propeller. When rotating in a predetermined direction, the propeller assembly 40 can generate a fluid pressure differential on both sides of the axial direction through its tilted blades, thereby promoting fluid flow from one axial side to the other.
- the specific principles of this propeller assembly 40 are widely known and will not be elaborated here.
- the propeller fan component 40 may include a connecting portion 41 and a plurality of blades 42, which are respectively connected to the connecting portion 41 to form a whole. These blades 42 may be formed integrally with the connecting portion 41, or may be fixed together after being formed separately. These blades 42 are spaced circumferentially around the rotation axis of the motor shaft 13, preferably evenly spaced, and each blade 42 is tilted in the same direction in the circumferential direction, so that the propeller fan component 40 generates a pumping suction force toward the motor cavity Cm when the motor shaft 13 rotates in a predetermined rotation direction.
- the inclination of the blades 42 means that the blades 42 have a non-zero inclination angle toward one side of the circumference relative to the plane passing through the rotation axis of the motor shaft 13.
- the propeller member 40 can have various structures.
- the connecting portion 41 can be a connecting ring extending around the rotation axis of the motor shaft 13 and fixed to the inner wall of the oil guide hole 14 (e.g., by interference fit or bonding), and the blades 42 can each extend radially inward from the connecting portion 41.
- the connecting portion 41 can be a connecting column (e.g., a circular column) extending axially along the rotation axis of the motor shaft 13, and the fan blades 42 can respectively extend radially outward from the connecting portion 41 and be fixed to the inner wall of the oil inlet hole 14 (e.g., by interference fit or bonding).
- a connecting column e.g., a circular column
- the fan blades 42 can respectively extend radially outward from the connecting portion 41 and be fixed to the inner wall of the oil inlet hole 14 (e.g., by interference fit or bonding).
- the connecting portion 41 may extend parallel to the rotation axis of the motor shaft 13, and the blades 42 are respectively connected to the same axial end of the connecting portion 41.
- the blades 42 shown in Figures 1 to 5 are a specific implementation of this embodiment.
- the connecting portion 41 is preferably a connecting sheet (a planar sheet structure) extending parallel to the rotation axis of the motor shaft 13 (especially extending through the rotation axis), which may have a roughly rectangular shape.
- the propeller fan component 40 may include two blades 42, both of which are roughly planar sheet structures and extend from the same axial end of the connecting portion 41 and are inclined in opposite directions relative to the extension plane of the connecting portion 41.
- the two blades 42 are located on both sides of the midpoint of the end edge of the connecting portion 41 and have approximately the same size and shape. This makes the two blades 42 inclined in the same direction in the circumferential direction.
- the connecting portion 41 and the two blades 42 can respectively abut the inner wall of the oil inlet hole 14 and can be fixed to the oil inlet hole 14 by an interference fit.
- Such two blades 42 can be formed integrally with the connecting portion 41, and in particular can be formed by stamping a single sheet of material. Therefore, such a propeller fan component 40 can have a low processing cost.
- the two blades 42 of the propeller member 40 can be connected to the axial end portion of the connecting portion 41 facing the first end 13a. This allows the blades 42 to be closer to the oil source to improve the pumping effect.
- the pump rotor assembly 20 includes a low-pressure chamber Cl for sucking in oil and a high-pressure chamber Ch for pumping out the sucked-in oil.
- the electric oil pump includes an oil supply chamber Cs that is connected to the low-pressure chamber Cl to supply oil to the pump rotor assembly 20.
- the opening of the oil inlet hole 14 located on the first end 13a can not be connected to the high-pressure chamber Ch.
- the oil inlet hole 14 can be connected to the oil supply chamber Cs via its opening located on the first end 13a so as to pump oil from the oil supply chamber Cs to the motor chamber Cm.
- the housing 30 may include a main body 31 and a pump head cover 32.
- the main body 31 is generally cylindrical around the central axis.
- the motor cavity Cm and the pump rotor cavity are basically formed in the main body 31.
- the motor cavity Cm and the pump rotor cavity are axially separated by a partition wall 31a formed inside the main body 31.
- 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 to close the pump rotor cavity.
- the low-pressure chamber Cl and the high-pressure chamber Ch are respectively formed between the pump head cover 32 and the pump rotor assembly.
- the oil supply chamber Cs is in It is axially located on the side of the pump head cover 32 facing away from the pump rotor assembly 20 and is connected to the low-pressure chamber Cl.
- the low-pressure chamber Cl and the high-pressure chamber Ch can be converted into each other by the rotation of the pump rotor assembly 20, but their positions relative to the housing 30 are fixed.
- An oil inlet hole 32a aligned with the motor shaft 13, especially with the oil inlet hole 14, can be formed on the pump head cover 32.
- the oil inlet hole 32a axially penetrates the pump head cover 32, so that the oil in the oil supply chamber Cs can flow directly into the oil inlet hole 14 through the oil inlet hole 32a.
- the motor chamber Cm can also communicate with the low-pressure chamber C1, allowing the oil drawn into the oil inlet hole 14 to circulate within the motor chamber Cm and then flow into the low-pressure chamber C1 under the action of a pressure differential.
- an oil outlet hole 31b aligned with the low-pressure chamber C1 can be formed in the partition wall 31a. This allows the oil in the motor chamber Cm to be further pumped out of the pump rotor assembly 20 via the high-pressure chamber Ch.
- the propeller member 40 can be preferably mounted radially inward of the first end 13a.
- the propeller member 40 can preferably not extend axially beyond the first end 13a.
- a certain axial clearance can exist between the end of the propeller member 40 facing the pump head cover 32 and the axial end surface of the first end 13a.
- the propeller component 40 can also be positioned by a step surface in the oil introduction hole 14.
- the oil introduction hole 14 may include a first section 14a and a second section 14b divided along the axial direction.
- the first section 14a extends axially between the axial end surface of the first end 13a and the second section 14b.
- the inner diameter of the first section 14a is larger than the inner diameter of the second section 14b, so that a step surface facing the first end 13a is formed at the junction of the first section 14a and the second section 14b.
- the propeller component 40 is installed in the first section 14a and abuts the step surface axially. This prevents the propeller component 40 from axially crossing the step surface and entering the second section 14b, thereby limiting the axial position of the propeller component 40.
- the electric oil pump according to the present invention can pump oil into the motor cavity through the propeller fan component, thereby improving the cooling effect of the drive motor and ensuring the working efficiency of the drive motor. Since the pump suction is generated by the motor shaft driving the propeller fan component to rotate, the oil inlet hole of the motor shaft does not need to be connected to the high-pressure chamber of the pump rotor assembly, thereby avoiding affecting the pumping efficiency of the pump rotor assembly.
- the oil inlet hole can directly draw oil from the oil supply chamber to cool the drive motor.
- the oil in the chamber can also be further circulated back into the low-pressure chamber. This can advantageously improve the volumetric efficiency of the electric oil pump. Furthermore, this propeller fan component has a simple structure and is easy to install, with low production costs, thus having high applicability.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
一种电动油泵,该电动油泵包括驱动电机(10)、泵转子组件(20)和壳体(30),壳体(30)包括容纳驱动电机(10)的电机腔(Cm),驱动电机(10)包括与泵转子组件(20)传动连接以驱动泵转子组件(20)的电机轴(13),电机轴(13)包括轴向贯穿并且连通到电机腔(Cm)的引油孔(14);其中,该电动油泵还包括桨扇构件(40),桨扇构件(40)固定地安装在引油孔(14)中,使得桨扇构件(40)能够在随着电机轴(13)相对于壳体(30)转动时产生朝向电机腔(Cm)内的泵吸力。
Description
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。
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。这些油泵通常由驱动电机来驱动,因此称为电动油泵。
电动油泵通常包括驱动电机、泵转子组件和壳体。驱动电机驱动泵转子组件转动来产生泵吸力。驱动电机和泵转子组件容纳在壳体的不同腔室中。容纳驱动电机的电机腔通常需要引入机油以对驱动电机进行冷却和润滑。
例如,CN 216741978 U公开了一种电动油泵,其将电动油泵的电机腔分别与泵转子组件的高压腔及低压腔连通,使得机油在油压作用下首先从高压腔进入电机腔,在电机腔中循环,然后再返回低压腔,进而实现对驱动电机的冷却。
然而,在这种方案中,泵转子组件的高压腔中的机油的一部分通过电机腔循环回到低压腔中,其效果类似于油泵内部发生泄漏,这导致油泵的泵送效率下降,进而降低了油泵的整体性能。
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,壳体包括容纳驱动电机的电机腔,驱动电机包括与泵转子组件传动连接以驱动泵转子组件的电机轴,电机轴包括轴向贯穿并且连通到电机腔的引油孔。其中,电动油泵还包括桨扇构
件,桨扇构件固定地安装在引油孔中,使得桨扇构件能够在随着电机轴相对于壳体转动时产生朝向电机腔内的泵吸力。安装在引油孔中的桨扇构件可以具有类似于风扇或螺旋桨的效果,其在随着电机轴转动时可以产生泵吸力,从而向电机腔内泵送机油,由此提高电机腔内的机油供应效率。同时,由于桨扇构件的泵吸力直接由电机轴的转动产生,不需要消耗泵转子组件的功率,因此可以提高电动油泵的效率。
根据本发明的一个优选实施例,泵转子组件可以包括用于吸入机油的低压腔和用于泵出所吸入的机油的高压腔,电动油泵可以包括与低压腔连通以向泵转子组件供应机油的机油供应腔,引油孔可以与机油供应腔连通以从机油供应腔向电机腔泵送机油。由于桨扇构件可以直接产生泵吸力,因此引油孔可以直接从机油供应腔吸入机油,而不再需要与泵转子组件的高压腔连通来借助油压向电机腔内泵送机油。由此可以减少对泵转子组件的泵送功率的消耗,从而提高泵送效率。
根据本发明的另一优选实施例,电机腔可以与低压腔连通,使得电机腔中的机油能够流入低压腔。这使得经由引油孔引入电机腔的机油可以在油压的作用下循环回到泵转子组件的低压腔,由此提高了低压腔的机油吸入量,进一步提高了泵转子组件的泵送效率。
根据本发明的另一优选实施例,电机轴可以包括沿轴向相对的第一端和第二端,第一端与泵转子组件传动连接,第二端延伸到电机腔中,桨扇构件可以安装在第一端的径向内侧。这使得桨扇构件更靠近机油的来源,由此提高吸入机油的效果。
根据本发明的另一优选实施例,桨扇构件可以在轴向上不伸出第一端之外。这使得桨扇构件不会与电机轴外的其他部件接触,特别是不会接触壳体,从而避免发生干涉。
根据本发明的另一优选实施例,引油孔可以包括沿轴向划分的第一部段和第二部段,第一部段在第一端的轴向端面与第二部段之间轴向延伸,第一部段的内径大于第二部段的内径,使得在第一部段和第二部段的交界处形成朝向第一端的台阶面,桨扇构件可以安装在第一部段中并且抵接台阶面。由此可以通过台阶面来限定桨扇构件在引油孔中的轴向位置。
根据本发明的另一优选实施例,桨扇构件可以包括连接部和分别连接到连接部的多个扇叶,该多个扇叶围绕电机轴的转动轴线沿周向间隔分布并且在周向上同向地倾斜,使得桨扇构件在随着电机轴沿预定转动方向转动时产生朝向电机腔内的泵吸力。这些扇叶可以用于产生泵吸力,而连接部可以将这些扇叶连接成一体。
根据本发明的另一优选实施例,桨扇构件可以具有以下结构中的一种:连接部是环绕电机轴的转动轴线延伸并且固定到引油孔的内壁的连接环,该多个扇叶分别从连接部朝向径向内侧延伸;连接部是沿着电机轴的转动轴线轴向延伸的连接柱,该多个扇叶分别从连接部朝向径向外侧延伸并且固定到引油孔的内壁;和连接部平行于电机轴的转动轴线延伸,该多个扇叶分别连接到连接部的同一轴向端部。桨扇构件可以呈现为各种不同的形式,只要能够产生泵吸力即可。
根据本发明的另一优选实施例,连接部可以是平行于电机轴的转动轴线延伸的连接片,桨扇构件可以包括两个扇叶,两个扇叶是分别从连接部的同一轴向端部延伸并且相对于连接部的延伸平面朝向两侧反向地倾斜的片状结构。这使得可以桨扇构件可以通过片材直接冲压成型,由此降低了生产成本。
根据本发明的另一优选实施例,两个扇叶可以连接到连接部的朝向第一端的轴向端部。这使得扇叶更加靠近机油的来源,由此提高吸入效果。
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示出应用根据本发明的示例性实施例的电动油泵的剖视图;
图2示出应用根据本发明的示例性实施例的电动油泵的端部正视图;
图3示出应用根据本发明的示例性实施例的电动油泵的电机轴的剖视图;
图4示出应用根据本发明的示例性实施例的电动油泵的桨扇构件的立体图;和
图5示出应用根据本发明的示例性实施例的电动油泵的电机轴的第一端的细节图。
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5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。
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,容纳驱动电机10(特别是容纳定子11和转子12)的腔室可以称为电机腔Cm,而容纳泵转子组件20的腔室可以称为泵转子腔。电机腔Cm与泵转子腔由壳体30中的分隔壁31a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延伸并且与泵转子组件20传动连接,而第二端13b沿轴向背向泵转子组件20伸出转子12并且延伸到电机腔Cm中。换句话说,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。
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能够由电机轴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。
如图1和图3所示,电机轴13包括基本轴向延伸的引油孔14。引油孔14从电机轴13的第一端13a的轴向端面一直延伸到第二端13b的轴向端面,从而轴向贯穿电机轴13并且经由位于第二端13b上的开口连通到电机腔Cm。引油孔14的位于第一端13a上的开口与某一含有机油的腔室连通。
电动油泵还包括桨扇构件40。桨扇构件40固定地安装在引油孔14中,使得桨扇构件40能够在随着电机轴13相对于壳体30转动时产生朝向电机腔Cm内的泵吸力。这种桨扇构件40是类似于常见的风扇或螺旋桨的部件,当沿预定的转动方向转动时,桨扇构件40可以通过倾斜的扇叶在轴向两侧产生流体压力差,从而促使流体从轴向一侧流向另一侧。这种桨扇构件40的具体原理是广泛已知的,在此不再赘述。
具体地,桨扇构件40可以包括连接部41和多个扇叶42,这些扇叶42分别连接到连接部41从而形成一个整体。这些扇叶42可以与连接部41一体形成,或者在分别形成后固定在一起。这些扇叶42围绕电机轴13的转动轴线沿周向间隔分布、优选均匀地间隔分布,同时每个扇叶42在周向上同向地倾斜,使得桨扇构件40在随着电机轴13沿预定转动方向转动时产生朝向电机腔Cm内的泵吸力。扇叶42的倾斜意味着扇叶42相对于经过电机轴13的转动轴线的平面具有朝向周向一侧的非零倾斜角。
桨扇构件40可以具有各种不同的结构。例如,在一个实施例中,连接部41可以是环绕电机轴13的转动轴线延伸的连接环,其固定到引油孔14的内壁(例如通过过盈配合或黏结),而这些扇叶42可以分别从连接部41开始朝向径向内侧延伸。
又例如,在另一个实施例中,连接部41可以是沿着电机轴13的转动轴线轴向延伸的连接柱(例如圆形柱),而这些扇叶42可以分别从连接部41开始朝向径向外侧延伸并且固定到引油孔14的内壁(例如通过过盈配合或黏结)。
再例如,在又一个实施例中,连接部41可以平行于电机轴13的转动轴线延伸,这些扇叶42分别连接到连接部41的同一轴向端部。图1至图5所示的扇叶42是该实施例的一种具体实现形式。如图4和图5所示,连接部41优选是平行于电机轴13的转动轴线延伸(特别是延伸经过转动轴线)的连接片(平面片状结构),其可以具有大致矩形的形状。桨扇构件40可以包括两个扇叶42,这两个扇叶42均为大致平面的片状结构,并且分别从连接部41的同一轴向端部开始延伸而相对于连接部41的延伸平面朝向两侧反向地倾斜。同时,这两个扇叶42位于连接部41的端部边缘的中点的两侧,并且具有大致相同的尺寸和形状。这使得这两个扇叶42在周向上同向地倾斜。连接部41和这两个扇叶42可以分别抵接引油孔14的内壁,并且可以通过过盈配合固定到引油孔14中。这样的两个扇叶42可以与连接部41一体形成,特别是可以由单个片材冲压形成。因此,这种桨扇构件40可以具有低廉的加工成本。
优选地,在图5所示的这种桨扇构件40的实施例中,桨扇构件40的两个扇叶42可以连接到连接部41的朝向第一端13a的轴向端部。这使得扇叶42更靠近机油源,以便提高泵送效果。
如图1和图2所示,泵转子组件20包括用于吸入机油的低压腔Cl和用于泵出所吸入的机油的高压腔Ch。电动油泵包括与低压腔Cl连通以向泵转子组件20供应机油的机油供应腔Cs。在根据本发明的电动油泵中,由于桨扇构件40可以产生泵吸力,因此可以不借助于腔室中的油压来向电机腔Cm中泵送机油。由此引油孔14的位于第一端13a上的开口可以不连通到高压腔Ch。特别优选地,引油孔14可以经由其位于第一端13a上的开口与机油供应腔Cs连通,以便从机油供应腔Cs向电机腔Cm泵送机油。
具体地,如图1和图2所示,壳体30可以包括主体部31和泵头盖32。主体部31大致呈围绕中心轴线的圆筒状。电机腔Cm和泵转子腔都基本形成在主体部31中。如图1所示,电机腔Cm与泵转子腔由形成在主体部31内部的分隔壁31a在轴向上分隔开。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。低压腔Cl和高压腔Ch分别形成在泵头盖32与泵转子组件之间。机油供应腔Cs在
轴向上位于泵头盖32的背向泵转子组件20的一侧并且与低压腔Cl连通。低压腔Cl与高压腔Ch可以通过泵转子组件20的转动而相互转换,但相对于壳体30的位置是固定的。在泵头盖32上可以形成有与电机轴13、特别是与引油孔14对准的进油孔32a。进油孔32a沿轴向贯穿泵头盖32,使得机油供应腔Cs中机油可以经由进油孔32a直接流入引油孔14。由此,来自于机油供应腔Cs的机油的一部分在低压腔C1的压差作用下进入低压腔Cl,另一部分在桨扇构件40的泵吸力作用下经由引油孔14进入电机腔Cm。
进一步优选地,电机腔Cm还可以与低压腔Cl连通,使得吸入引油孔14中的机油在电机腔Cm中循环之后能够在压差作用下流入低压腔Cl。例如,可以在分隔壁31a上形成与低压腔Cl对准的出油孔31b。这使得电机腔Cm中的机油可以进一步经由高压腔Ch泵送出泵转子组件20。
为了使桨扇构件40靠近机油的来源,如图1所示,桨扇构件40可以优选地安装在第一端13a的径向内侧。此时,为了避免转动的桨扇构件40与外部的固定构件发生干涉,桨扇构件40可以优选地在轴向上不伸出第一端13a之外。特别是,在桨扇构件40的朝向泵头盖32的端部与第一端13a的轴向端面之间可以存在一定的轴向间隙。
如图3和图5所示,在优选的实施例中,还可以通过引油孔14中的台阶面来定位桨扇构件40。具体地,引油孔14可以包括沿轴向划分的第一部段14a和第二部段14b。第一部段14a在第一端13a的轴向端面与第二部段14b之间轴向延伸。第一部段14a的内径大于第二部段14b的内径,使得在第一部段14a和第二部段14b的交界处形成朝向第一端13a的台阶面。桨扇构件40安装在第一部段14a中并且沿轴向抵接台阶面。这使得桨扇构件40无法沿轴向越过台阶面而进入第二部段14b中,由此限定了桨扇构件40的轴向位置。
根据本发明的电动油泵可以通过桨扇构件来向电机腔内泵送机油,由此改善了驱动电机的冷却效果,确保了驱动电机的工作效率。由于通过电机轴带动桨扇构件转动来产生泵吸力,因此电机轴的引油孔不必连通到泵转子组件的高压腔,从而避免了对泵转子组件的泵送效率的影响。引油孔可以直接从机油供应腔吸入机油来冷却驱动电机。通过桨扇构件引入电机
腔的机油还可以进一步循环回到低压腔中。这可以有利地提高电动油泵的体积效率。同时,这种桨扇构件结构简单且易于安装,生产成本低廉,因此具有较高的可应用性。
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
14 引油孔
14a 第一部段
14b 第二部段
20 泵转子组件
30 壳体
31 主体部
31a 分隔壁
31b 出油孔
32 泵头盖
32a 进油孔
40 桨扇构件
41 连接部
42 扇叶
Ch 高压腔
Cl 低压腔
Cm 电机腔
Cs 机油供应腔
10 驱动电机
11 定子
12 转子
13 电机轴
13a 第一端
13b 第二端
14 引油孔
14a 第一部段
14b 第二部段
20 泵转子组件
30 壳体
31 主体部
31a 分隔壁
31b 出油孔
32 泵头盖
32a 进油孔
40 桨扇构件
41 连接部
42 扇叶
Ch 高压腔
Cl 低压腔
Cm 电机腔
Cs 机油供应腔
Claims (10)
- 一种电动油泵,包括驱动电机(10)、泵转子组件(20)和壳体(30),所述壳体(30)包括容纳所述驱动电机(10)的电机腔(Cm),所述驱动电机(10)包括与所述泵转子组件(20)传动连接以驱动所述泵转子组件(20)的电机轴(13),所述电机轴(13)包括轴向贯穿并且连通到所述电机腔(Cm)的引油孔(14),其特征在于,所述电动油泵还包括桨扇构件(40),所述桨扇构件(40)固定地安装在所述引油孔(14)中,使得所述桨扇构件(40)能够在随着所述电机轴(13)相对于所述壳体(30)转动时产生朝向所述电机腔(Cm)内的泵吸力。
- 根据权利要求1所述的电动油泵,其特征在于,所述泵转子组件(20)包括用于吸入机油的低压腔(Cl)和用于泵出所吸入的机油的高压腔(Ch),所述电动油泵包括与所述低压腔(Cl)连通以向所述泵转子组件(20)供应机油的机油供应腔(Cs),所述引油孔(14)与所述机油供应腔(Cs)连通以从所述机油供应腔(Cs)向所述电机腔(Cm)泵送机油。
- 根据权利要求2所述的电动油泵,其特征在于,所述电机腔(Cm)与所述低压腔(Cl)连通,使得所述电机腔(Cm)中的机油能够流入所述低压腔(Cl)。
- 根据权利要求2所述的电动油泵,其特征在于,所述电机轴(13)包括沿轴向相对的第一端(13a)和第二端(13b),所述第一端(13a)与所述泵转子组件(20)传动连接,所述第二端(13b)延伸到所述电机腔(Cm)中,所述桨扇构件(40)安装在所述第一端(13a)的径向内侧。
- 根据权利要求4所述的电动油泵,其特征在于,所述桨扇构件(40)在轴向上不伸出所述第一端(13a)之外。
- 根据权利要求4所述的电动油泵,所述引油孔(14)包括沿轴向划分的第一部段(14a)和第二部段(14b),所述第一部段(14a)在所述第 一端(13a)的轴向端面与所述第二部段(14b)之间轴向延伸,所述第一部段(14a)的内径大于所述第二部段(14b)的内径,使得在所述第一部段(14a)和所述第二部段(14b)的交界处形成朝向所述第一端(13a)的台阶面,所述桨扇构件(40)安装在所述第一部段(14a)中并且抵接所述台阶面。
- 根据权利要求2至6中任一项所述的电动油泵,其特征在于,所述桨扇构件(40)包括连接部(41)和分别连接到所述连接部(41)的多个扇叶(42),所述多个扇叶(42)围绕所述电机轴(13)的转动轴线沿周向间隔分布并且在周向上同向地倾斜,使得所述桨扇构件(40)在随着所述电机轴(13)沿预定转动方向转动时产生朝向所述电机腔(Cm)内的泵吸力。
- 根据权利要求7所述的电动油泵,其特征在于,所述桨扇构件(40)具有以下结构中的一种:所述连接部(41)是环绕所述电机轴(13)的转动轴线延伸并且固定到所述引油孔(14)的内壁的连接环,所述多个扇叶(42)分别从所述连接部(41)朝向径向内侧延伸;所述连接部(41)是沿着所述电机轴(13)的转动轴线轴向延伸的连接柱,所述多个扇叶(42)分别从所述连接部(41)朝向径向外侧延伸并且固定到所述引油孔(14)的内壁;和所述连接部(41)平行于所述电机轴(13)的转动轴线延伸,所述多个扇叶(42)分别连接到所述连接部(41)的同一轴向端部。
- 根据权利要求8所述的电动油泵,其特征在于,所述连接部(41)是平行于所述电机轴(13)的转动轴线延伸的连接片,所述桨扇构件(40)包括两个扇叶(42),所述两个扇叶(42)是分别从所述连接部(41)的同一轴向端部延伸并且相对于所述连接部(41)的延伸平面朝向两侧反向地倾斜的片状结构。
- 根据权利要求9所述的电动油泵,其特征在于,所述两个扇叶(42)连接到所述连接部(41)的朝向所述第一端(13a)的轴向端部。
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