A fuel injection member and an electric machine

Abstract

The utility model discloses a kind of oil injection components and motor, oil injection component includes: oil inlet passage, one end of oil inlet passage is used to communicate with the motor shaft oil hole of outside;Supercharging part, supercharging part is communicated with the other end of oil inlet passage;Oil outlet passage, one end of oil outlet passage is communicated with supercharging part, the other end of oil outlet passage is equipped with oil outlet hole, oil outlet hole is used to towards the stator winding of outside, the orientation of the opening of oil outlet hole and axial intersection.The utility model is simple in structure, can increase cooling area, eliminate the cooling dead zone of the stator winding of motor.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to an oil injection component and a motor. Background Technology

[0002] With the increasing global demand for new energy vehicles, the performance improvement of the three-electric system (including the motor, electronic control system, and reducer), as the core technology of new energy vehicles, has become the focus of industry development. To improve the power performance, acceleration, and range of new energy vehicles, the market is increasingly demanding higher power density and system speed from the three-electric system. To achieve this, cooling systems are gradually being upgraded from water cooling to oil cooling, for example, using the same oil for both the reducer and the motor, to achieve a more efficient and integrated thermal management solution.

[0003] Currently, the commonly used cooling method involves drilling holes in the motor shaft and guiding the oil through oil guide grooves on the rotor end plate. The rotation of the motor shaft uses centrifugal force to throw the cooling oil into the crown area of ​​the motor stator winding for cooling. However, when using end plate grooves for oil throwing, the trajectory of the cooling oil after leaving the rotor end plate is difficult to control, and the landing area of ​​the thrown oil is not precise enough, resulting in poor cooling effect on the motor stator winding. Utility Model Content

[0004] The purpose of this invention is to solve the problem of poor cooling effect of oil slinging from existing rotor end plates. This invention provides an oil injection component and a motor with a simple structure, which can increase the cooling area and eliminate the cooling dead zone of the motor stator windings.

[0005] To solve the above-mentioned technical problems, the present invention discloses an oil injection component, comprising: an oil inlet channel, one end of which is connected to an external motor shaft oil hole; a booster section, which is connected to the other end of the oil inlet channel; and an oil outlet channel, one end of which is connected to the booster section, and the other end of which is provided with an oil outlet hole, the oil outlet hole being directed toward the external stator winding, the opening of the oil outlet hole being oriented intersecting the axial direction.

[0006] Using the above technical solution, in this embodiment, the cooling oil sequentially passes through the inlet channel, the booster section, and the outlet channel in the injection component. After continuous acceleration in the booster section, it is ejected at high speed through the outlet hole at the other end of the outlet channel, thereby achieving the condition of cooling oil liquid atomization. That is, the cooling oil ejected by the injection component changes from liquid to mist, which greatly increases the contact area between the cooling oil and the stator winding of the motor, increases the cooling area of ​​the cooling oil in this embodiment, and eliminates the cooling dead zone of the stator winding of the motor.

[0007] According to another specific embodiment of the present invention, the pressurizing part includes: a first part, the inner wall of the first part having a threaded groove, one end of the threaded groove being connected to the other end of the oil inlet channel; a second part, axially disposed between the first part and the oil outlet channel, the second part having a first end and a second end, the first end of the second part having an oil inlet, the oil inlet being connected to the other end of the threaded groove, the second end of the second part having an oil outlet, the oil outlet being connected to the one end of the oil outlet channel, and the cross-sectional area of ​​the oil outlet being smaller than the cross-sectional area of ​​the oil inlet.

[0008] Using the above technical solution, after the cooling oil enters the second part in this embodiment of the application, since the cross-sectional area of ​​the oil outlet is smaller than that of the oil inlet, the oil pressure of the cooling oil at the oil outlet is higher than that at the oil inlet. The second part can increase the pressure of the cooling oil and maintain the increase in speed, thereby achieving an acceleration effect. Finally, it is ejected at high speed through the opening of the oil outlet hole. Due to the instantaneous entry into the open space, the cooling oil liquid is violently reverse-compressed and becomes mist, which increases the cooling area of ​​the cooling oil and eliminates the cooling dead zone of the stator winding.

[0009] Furthermore, because the cooling oil spirals along the threaded groove in the first part of the pressurization section, after accelerating into the second part, it maintains a vortex flow along the inner wall of the second part, further increasing its velocity. In other words, the first part of the pressurization section enables the cooling oil to maintain a vortex flow after entering the second part, further prolonging the process of increasing pressure and velocity in the second part, thus achieving a better acceleration effect.

[0010] According to another specific embodiment of the present invention, the cross-sectional area of ​​the second part gradually decreases along the extending direction of the pressurizing part.

[0011] By adopting the above technical solution, the cross-sectional area of ​​the second part of the pressurization section gradually decreases. As the cooling oil flows from the first part through the second part to the oil outlet channel, the pressure and flow rate of the cooling oil continue to increase as the flow space decreases, so as to achieve a continuous acceleration effect. This causes the oil pressure in the second part of the pressurization section to gradually rise, and then the cooling oil can be ejected at high speed through the oil outlet channel.

[0012] According to another specific embodiment of the present invention, the oil outlet hole includes a blocking part, which protrudes from the top of the hole wall of the oil outlet hole so that the angle between the opening of the oil outlet hole and the axial direction is an acute angle.

[0013] By adopting the above technical solution, by setting a blocking part at the opening of the oil outlet and designing the orientation of the oil outlet opening, the spray angle of the cooling oil can be adjusted so that the angle between the orientation of the oil outlet opening and the axial direction is an acute angle. This allows the cooling oil to be accurately sprayed onto the stator winding, maintaining better directionality of the cooling oil mist, which helps to eliminate the cooling dead zone of the stator winding and achieve a more controllable cooling effect for the stator winding.

[0014] The present invention also discloses an electric motor, the electric motor comprising: a rotor end plate, wherein the oil injection component described in any of the preceding embodiments is disposed on the rotor end plate; a motor shaft, wherein the motor shaft includes a motor shaft oil hole, the motor shaft oil hole being connected to the oil inlet channel; and a stator winding, wherein the opening of the oil outlet is disposed facing the stator winding.

[0015] According to another specific embodiment of the present invention, the motor includes a locking ring and a stator core. Along the axial direction, the stator core, the rotor end plate, and the locking ring are arranged in sequence, and the locking ring is used to fix the rotor end plate and the stator core. Attached Figure Description

[0016] Figure 1 A cross-sectional view of the motor according to an embodiment of the present invention is shown;

[0017] Figure 2 Show Figure 1 A magnified view of a portion of region A in the middle;

[0018] Figure 3 A cross-sectional view of the oil spraying component according to an embodiment of the present invention is shown;

[0019] Figure 4 The image shows a front view of the oil spraying component according to an embodiment of the present invention. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0021] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0023] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0026] refer to Figures 1 to 3 This application provides an electric motor 200, which includes an oil injection component 100, a rotor end plate 210, a motor shaft 220, and a stator winding 230. Exemplarily, the motor shaft 220 of this application embodiment is a hollow shaft, and the motor shaft 220 has a receiving cavity 220a for receiving cooling oil. Figure 1 and Figure 2 As shown, the motor 200 also includes a locking ring 240 and a stator core 250, along the axial direction (e.g., Figure 1 and Figure 2 As shown in the X direction, the stator core 250, rotor end plate 210, and locking ring 240 are arranged sequentially. Exemplarily, the locking ring 240 in this embodiment is a circular ring with a rectangular cross-section, but it is not limited thereto. This embodiment does not limit the specific structure of the locking ring 240, as long as it can be used to fix the rotor end plate 210 and the stator core 250 to restrict the rotor end plate 210 from moving along the X-axis.

[0027] Among them, such as Figure 2 As shown, the motor shaft 220 of this embodiment includes a motor shaft oil hole 221. The oil injection component 100 provided in this embodiment is disposed on the rotor end plate 210 and along the radial direction (e.g., Figure 2 The oil injection component 100 is positioned opposite to the motor shaft oil hole 221 of the motor shaft 220 in the Y direction, so that fluid flows between the oil injection component 100 and the motor shaft 220 through the motor shaft oil hole 221, thereby allowing the cooling oil in the motor shaft 220 to enter the oil injection component 100 through the motor shaft oil hole 221 under the action of an external force (such as the centrifugal force generated by the rotation of the motor shaft 220).

[0028] The structure and working principle of the oil spraying component 100 of the present application embodiment will be described in detail below with reference to the accompanying drawings.

[0029] Continue to refer to Figure 2 The oil injection component 100 of this application embodiment includes an oil inlet channel 110, a booster section 120, and an oil outlet channel 130. One end 1101 of the oil inlet channel 110 communicates with the motor shaft oil hole 221, and the booster section 120 communicates with the other end 1102 of the oil inlet channel 110, so that cooling oil can flow from the receiving cavity 220a of the motor shaft 220 into the oil inlet channel 110 through the motor shaft oil hole 221, and then into the booster section 120. One end 1301 of the oil outlet channel 130 communicates with the booster section 120, and the other end 1302 of the oil outlet channel 130 is provided with an oil outlet hole 140, the opening 140a of the oil outlet hole 140 facing the stator winding 230. Exemplarily, the orientation of the opening 140a of the oil outlet hole 140 in this application embodiment (e.g., Figure 2 (as shown by the direction of the dashed line E) and the axial direction (as shown by...) Figure 2 Intersects (as shown in the X direction).

[0030] Therefore, in this embodiment, an oil spraying component 100 is machined on the rotor end plate 210 of the motor 200. The cooling oil ejected from the motor shaft oil hole 221 passes sequentially through the oil inlet channel 110, the booster section 120, and the oil outlet channel 130 in the oil spraying component 100. After being continuously accelerated in the booster section 120, it is ejected at high speed through the oil outlet hole 140 at the other end 1302 of the oil outlet channel 130, thereby achieving the condition of cooling oil liquid atomization. That is, the cooling oil ejected by the oil spraying component 100 changes from oil liquid to mist, thereby greatly increasing the contact area between the cooling oil and the stator winding 230 (especially the crown portion of the stator winding 230, not shown in the figure), increasing the cooling area of ​​the cooling oil in this embodiment, and eliminating the cooling dead zone of the stator winding 230.

[0031] refer to Figure 3 and combined Figure 4 The booster unit 120 includes a first part 1201 and a second part 1202. The second part 1202 is axially (e.g., ...). Figure 3 (As shown in the X direction) It is located between the first part 1201 and the oil outlet channel 130. That is, after the cooling oil enters the first part 1201 of the booster section 120, it flows through the second part 1202 and then enters the oil outlet channel 130.

[0032] Specifically, the inner wall 12011 of the first part 1201 of the booster unit 120 is provided with a threaded groove 12012. One end 12012a of the threaded groove 12012 is connected to the other end 1102 of the oil inlet channel 110, and the other end 12012b of the threaded groove 12012 is connected to the oil inlet 12021 described later. Thus, as Figure 3 and Figure 4 As shown, the cooling oil inside the motor shaft 220 enters the oil inlet channel 110 through the motor shaft oil hole 221 under the action of an external force (such as the centrifugal force generated by the rotation of the motor shaft 220), and then flows from the other end 1102 of the oil inlet channel 110 along the tangential direction of the booster section 120 (i.e., radial Y, as shown). Figure 4 (As indicated by the black arrow in the middle) enters the threaded groove 12012 of the first part 1201, and within the threaded groove 12012, follows the direction of the dashed arrow (see...). Figure 4 After the spiral accelerates, the cooling oil enters the second part 1202 of the booster section 120.

[0033] The second part 1202 described above has a first end 1202a and a second end 1202b. The first end 1202a of the second part 1202 is provided with an oil inlet 12021, and the second end 1202b of the second part 1202 is provided with an oil outlet 12022. The cross-sectional area of ​​the oil outlet 12022 is smaller than the cross-sectional area of ​​the oil inlet 12021, and the oil outlet 12022 is connected to one end 1301 of the oil outlet channel 130.

[0034] Therefore, it can be understood that after the cooling oil enters the second part 1202, since the cross-sectional area of ​​the oil outlet 12022 is smaller than that of the oil inlet 12021, the oil pressure at the oil outlet 12022 is higher than that at the oil inlet 12021. The second part 1202 can increase the pressure of the cooling oil (not shown in the figure) and maintain the increase in speed to achieve an acceleration effect. Finally, it is ejected at high speed through the opening 140a of the oil outlet 140. Due to the instantaneous entry into the open space, the cooling oil liquid is violently reverse-compressed and becomes mist, which increases the cooling area of ​​the cooling oil and eliminates the cooling dead zone of the stator winding 230.

[0035] For example, such as Figure 3 As shown, along the extending direction of the booster section 120 (e.g.) Figure 3As shown in the direction of F in the middle section, the cross-sectional area of ​​the second part 1202 of the booster section 120 gradually decreases. As the cross-sectional area of ​​the second part 1202 of the booster section 120 gradually decreases, the cooling oil flows from the first part 1201 through the second part 1202 to the oil outlet channel 130. With the decreasing flow space, the pressure and flow rate of the cooling oil continue to increase, achieving a continuous acceleration effect. This causes the oil pressure within the second part 1202 of the booster section 120 to gradually rise, allowing the cooling oil to flow through the oil outlet channel 130 in the direction of the black arrow (see...). Figure 3 It is fired at high speed.

[0036] For example, such as Figure 3 As shown, the cross-section of the second portion 1202 of the booster section 120 in this embodiment is trapezoidal, that is, the second portion 1202 is a conical region. Since the cooling oil flows along the thick black line with arrows in the first portion 1201 of the booster section 120 (see...), Figure 3 The cooling oil moves spirally within the threaded groove 12012, accelerating as it enters the conical region of the second part 1202, and then moves along the direction of the thin black line with the arrow (see...). Figure 3 The cooling oil maintains a downward spiral vortex flow on the conical wall of the second part 1202, and the velocity of the cooling oil further increases as the cross-sectional area of ​​the second part 1202 contracts. In other words, the first part 1201 of the pressurization section 120 enables the cooling oil to maintain a vortex flow after entering the second part 1202, further prolonging the process of the cooling oil's pressure and velocity increasing in the second part 1202, so as to achieve a better acceleration effect.

[0037] It should be noted that the embodiments of this application do not impose specific limitations on the cross-sectional shape of the second part 1202 of the booster 120. For example, in other possible embodiments, the cross-sectional shape of the second part 1202 of the booster 120 can be a right trapezoid, a semicircle, a semi-ellipse, etc.

[0038] Exemplary, in some possible implementations, reference continues to be made to Figure 3 The oil outlet 140 in this embodiment includes a blocking portion 1401. The blocking portion 1401 protrudes from the top 140b of the oil outlet 140 wall to form a baffle-like structure, and the orientation of the opening 140a of the oil outlet 140 is determined based on the uneven design of the opening 140a (e.g., ...). Figure 3As shown in the E direction, the angle α between the opening 140a of the oil outlet 140 and the axial direction X is made acute. This adjusts the spray angle of the cooling oil, allowing it to be precisely sprayed onto the stator winding 230, maintaining better directionality of the cooling oil mist. This helps eliminate cooling dead zones in the stator winding 230, achieving a more controllable cooling effect. This application does not impose specific limitations on the value of the angle α; for example, it can be any value from 20° to 85°. In possible implementations, the value of the angle α can be 55° or 78°, etc.

[0039] Exemplary examples, in some possible implementations, although not shown in the drawings, the extension direction of the oil outlet channel 130 in this embodiment may intersect the axial direction X and face the stator winding 230 (e.g., having an included angle α), so that even if the oil outlet 140 does not include the blocking portion 1401, its opening 140a may still face the stator winding 230. In this case, the extension direction F of the booster portion 120 (or only the extension direction of its second portion 1202) may be parallel to the axial direction X or intersect the axial direction X.

[0040] For example, such as Figure 2 As shown, in this embodiment of the application, the oil inlet channel 110 of the oil injection component 100 is located on the side of the rotor end plate 210 away from the locking ring 240 to facilitate machining. However, this embodiment of the application does not limit the specific structure of the oil injection component 100. For example, in other possible implementations, the oil inlet channel 110 may also be located inside the rotor end plate 210.

[0041] Furthermore, this application embodiment does not limit the extension direction of the oil inlet channel 110, the booster section 120, and the oil outlet channel 130 of the fuel injection component 100. In this application embodiment, the oil inlet channel 110 extends radially Y, the oil outlet channel 130 extends axially X, and the extension direction F of the booster section 120 intersects with the axial direction X. However, it is not limited to this. As long as the cooling oil can flow from the receiving cavity 220a of the motor shaft 220 through the motor shaft oil hole 221 into the fuel injection component 100, and then be accelerated and pressurized by the booster section 120 of the fuel injection component 100, it is acceptable.

[0042] In summary, this embodiment of the application has a fuel injection component 100 with a conical spiral structure, which is machined on the rotor end plate 210 of the motor 200. The oil in the motor shaft 220 is thrown out through the motor shaft oil hole 221 and continuously accelerated in the fuel injection component 100's pressurization part 120 before being ejected at high speed through the oil outlet 140, achieving liquid atomization. The oil becomes mist, which greatly increases the contact area between the cooling oil and the stator winding 230, increases the cooling area of ​​the cooling oil in this embodiment of the application, and eliminates the cooling dead zone of the stator winding 230.

[0043] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A spraying component, characterized in that, include: An oil inlet channel, one end of which is used to communicate with the external motor shaft oil hole; A booster unit, wherein the booster unit is connected to the other end of the oil inlet channel; An oil outlet channel is provided, one end of which is connected to the pressurization unit, and the other end of which is provided with an oil outlet hole. The oil outlet hole is used for the stator winding facing the outside, and the opening of the oil outlet hole is oriented to intersect the axial direction.

2. The oil spraying component as described in claim 1, characterized in that, The pressurization unit includes: The first part has a threaded groove on its inner wall, and one end of the threaded groove is connected to the other end of the oil inlet channel; The second part is disposed axially between the first part and the oil outlet channel. The second part has a first end and a second end. The first end of the second part is provided with an oil inlet, which is connected to the other end of the threaded groove. The second end of the second part is provided with an oil outlet, which is connected to the first end of the oil outlet channel. The cross-sectional area of ​​the oil outlet is smaller than that of the oil inlet.

3. The oil spraying component as described in claim 2, characterized in that, Along the extending direction of the pressurizing section, the cross-sectional area of ​​the second part gradually decreases.

4. The oil spraying component as described in claim 2 or 3, characterized in that, The second part of the pressurization section has a trapezoidal cross-section.

5. The oil spraying component as described in claim 1, characterized in that, The oil outlet includes a blocking part, which protrudes from the top of the wall of the oil outlet so that the angle between the opening of the oil outlet and the axial direction is an acute angle.

6. An electric motor, characterized in that, The motor includes: The rotor end plate, wherein the oil injection component according to any one of claims 1 to 5 is disposed on the rotor end plate; The motor shaft includes an oil hole that communicates with the oil inlet channel. The stator winding has the opening of the oil outlet facing the stator winding.

7. The motor as described in claim 6, characterized in that, The motor includes a locking ring and a stator core. Along the axial direction, the stator core, the rotor end plate, and the locking ring are arranged in sequence. The locking ring is used to fix the rotor end plate and the stator core.

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