WO2024036608A1

WO2024036608A1 - Centripetal guide device for fluid, and power system for vehicle

Info

Publication number: WO2024036608A1
Application number: PCT/CN2022/113635
Authority: WO
Inventors: 郭淮伟; 蔡向阳; 吴清
Original assignee: 舍弗勒技术股份两合公司; 郭淮伟
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2024-02-22

Abstract

Provided is a centripetal guide device for a fluid. The device comprises: a main body portion (11), wherein the main body portion has an annular shape, with an intake hole (11h) being formed therein; and a plurality of guide portions (12), wherein the guide portion (12) is fixed on a peripheral surface of the main body portion (11) and protrudes from the peripheral surface towards a radial outer side. The guide portion (12) is provided with an opening (12p) and a passage (12h), the opening (12p) being opened towards one side in a circumferential direction, and the passage (12h) extending from the opening (12p) to the intake hole (11h). A radial outer wall surface of the passage (12h) extends in a curve from the opening (12p) towards the intake hole (11h), and is used for guiding a fluid flowing from the opening (12p) to the intake hole (11h) during the rotation of the centripetal guide device (1) for a fluid. The centripetal guide device for a fluid of the present application can achieve the centripetal guide function of a fluid, such as oil, by using a relatively simple structure. Further provided is a power system for a vehicle, the power system comprising the centripetal guide device for a fluid.

Description

Fluid centripetal guidance device and vehicle power system

Technical field

The present application relates to the field of fluid guidance, and specifically to a guidance device for centripetally guiding fluid and a vehicle power system including the guidance device.

Background technique

In the existing technology, new energy vehicles such as electric vehicles integrate the drive motor, planetary gear reducer and braking system in the wheel space to form an in-wheel motor drive system as the vehicle power system to drive the wheels to rotate. . In this kind of hub motor drive system, a cooling mechanism and a lubricating mechanism need to be provided to cool and lubricate each component, and a guiding device for guiding the fluid used for cooling and lubricating needs to be installed so that the fluid can be smoothly guided to the object. part.

Contents of the invention

This application is made based on the above-mentioned needs of the prior art. One object of the present application is to provide a fluid centripetal guide device that can achieve centripetal guide of fluid (eg, oil) with a relatively simple structure. Another object of the present application is to provide a vehicle power system including the above-mentioned fluid centripetal guide device.

In order to achieve the above-mentioned object of the invention, this application adopts the following technical solutions.

This application provides a fluid centripetal guiding device, including:

A main body portion having an annular shape and formed with an inlet hole penetrating in the radial direction; and

A plurality of guide parts arranged at intervals in the circumferential direction of the main body part, the guide parts being fixed to the outer peripheral surface of the main body part and protruding from the outer peripheral surface toward the radially outer side, The guide portion is formed with an opening and a channel, the opening is open toward one circumferential side, the channel extends from the opening to the inlet hole, and the radially outer wall surface of the channel is from the opening toward the inlet hole. The inlet hole extends in a curved manner for guiding fluid flowing in from the opening toward the inlet hole during rotation of the fluid centripetal guide device.

In an optional solution, the radially outer wall surface extends toward the radially inner side while extending from the opening toward the other side in the circumferential direction.

In another optional solution, the width of the channel gradually narrows from the opening toward the inlet hole, and a portion of the outer peripheral surface located within the channel is formed with an inclination toward the inlet hole. guide surface.

In another optional solution, the fluid centripetal guide device further includes a mounting portion, which is fixed to the inner peripheral surface of the main body portion and protrudes radially inwardly from the inner peripheral surface, The mounting portion and the inlet hole are arranged staggered.

In another optional solution, the mounting portion is formed in a convex shape extending linearly along the axial direction of the main body portion.

This application also provides the following vehicle power system, including the fluid centripetal guiding device described in any one of the above technical solutions.

In an optional solution, it also includes a motor shaft, the motor shaft is formed into a hollow structure, and the motor shaft is also formed with a guide hole penetrating its wall,

The fluid centripetal guide device is fixed to the motor shaft, and the inlet hole of the fluid centripetal guide device is connected with the guide hole.

In another optional solution, the motor shaft is formed with a flange portion, the flange portion protrudes toward the radially outer side relative to other parts of the motor shaft, and the main body of the fluid centripetal guide device The outer sleeve is fixed on the radial outer side of the flange part.

In another optional solution, the outer circumferential surface of the flange portion is formed with a mounting groove, the mounting groove is open toward one axial side or the other axial side, and the convex strips of the fluid centripetal guide device The shaped mounting part is mounted in the mounting groove.

In another optional solution, it also includes an output shaft, a bearing and a sealing assembly, the bearing is located in the installation space between the motor shaft and the output shaft, and the sealing assembly is used to seal the installation space. One end of the guide hole can guide the fluid toward the installation space.

By adopting the above technical solution, the present application provides the following fluid centripetal guide device, which includes an annular main body part and a plurality of guide parts protruding from the outer peripheral surface of the main body part, and each guide part is formed with the main body part. The radially outer wall surface of the channel is used to guide the fluid entering from the opening of the channel to the inlet hole during the operation of the fluid centripetal guide device.

Therefore, the fluid centripetal guiding device of the present application can realize the centripetal guiding function of fluid (eg, oil) with a relatively simple structure. The fluid centripetal guide device according to the present application is easy to manufacture and has low cost, which is conducive to large-scale industrial production. Moreover, the fluid centripetal guide device is relatively small in size, takes up less installation space, and can be adapted to the vehicle power system. middle. The present application also provides a vehicle power system including the above-mentioned fluid centripetal guide device, which can use the fluid centripetal guide device to guide fluid to an object component so as to cool and lubricate it.

Description of drawings

FIG. 1A is a perspective view illustrating a centripetal fluid guiding device according to an embodiment of the present application.

FIG. 1B is a schematic front view showing the fluid centripetal guide device in FIG. 1A .

FIG. 1C is a schematic perspective view of the fluid centripetal guiding device in FIG. 1A in cross-section, with the cross-section lines omitted.

FIG. 1D is a schematic side view showing the fluid centripetal guide device in FIG. 1A .

FIG. 2A is a schematic cross-sectional view showing a partial structure of a vehicle power system (taking an in-wheel motor drive system as an example) according to an embodiment of the present application. The vehicle power system includes the fluid centripetal structure shown in FIG. 1A guide device and the section lines are omitted from the figure.

Fig. 2B is a schematic perspective view showing an assembly of both the fluid centripetal guide device and the motor shaft of the vehicle power system in Fig. 2A.

FIG. 2C is a schematic perspective view showing a motor shaft of the vehicle power system in FIG. 2A .

Explanation of reference signs

1 Fluid centripetal guide device; 11 main body; 11h inlet hole; 11s guide surface; 12 guide part; 12p opening; 12h channel; 13 installation part;

2 motor shaft; 2h guide hole; 2c mounting groove; 21 flange part; 22 first gear part; 23 second gear part; 24 bracket mounting part;

3 output shaft; 4 bearings; 5 seal components;

S installation space;

A axial direction; R radial direction; C circumferential direction.

Detailed ways

Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible ways of the present application, nor are they intended to limit the scope of the present application.

In this application, unless otherwise specified, "axial direction", "radial direction" and "circumferential direction" respectively refer to the axial direction, radial direction and circumferential direction of the fluid centripetal guide device (main part) of the application. “Axially one side” refers to the left side in FIGS. 1D and 2A , and “axially the other side” refers to the right side in FIGS. 1D and 2A .

In this application, "transmission coupling" means that two components are connected to each other in a manner capable of transmitting torque, including both direct and indirect connections between the two components.

The structure of a fluid centripetal guiding device according to an embodiment of the present application will first be described below with reference to the accompanying drawings.

(Fluid centripetal guiding device according to an embodiment of the present application)

As shown in FIGS. 1A to 1D , the fluid centripetal guide device 1 according to an embodiment of the present application includes a main body part 11 , a guide part 12 and a mounting part 13 formed into one body. The guide part 12 is fixedly provided on the main body part 11 On the outer peripheral surface, the mounting portion 13 is fixedly provided on the inner peripheral surface of the main body 11 .

In this embodiment, as shown in FIGS. 1A to 1D , the main body portion 11 is formed into an annular shape extending continuously along the entire circumference along the circumferential direction C. The main body part 11 is formed with three inlet holes 11h penetrating in the radial direction R. Each inlet hole 11h matches one guide part 12 and communicates with the channel 12h formed by the guide part 12. The portion of the outer peripheral surface of the main body 11 located in the channel 12h is also formed with a guide surface 11s. The main body 11 can be cut to form the guide surface 11s, so that the guide surface 11s is inclined toward the inlet hole 11h to assist in guiding the fluid entering from the inlet. Flow to the entry hole 11h.

In this embodiment, as shown in FIGS. 1A to 1C , the three guide portions 12 are evenly spaced apart in the circumferential direction C. Each guide portion 12 is fixed to the outer peripheral surface of the main body portion 11 and protrudes from the outer peripheral surface toward the radially outer side. Each guide portion 12 is formed with an opening 12p open toward one side in the circumferential direction (for example, the downstream side in the counterclockwise direction shown in FIGS. 1A to 1C ). The guide part 12 is also formed with a passage 12h extending from the opening 12p to the inlet hole 11h. The passage 12h actually consists of the radially outer wall, the axial one side wall, the other axial side wall of the guide part 12 and the main body part 11 Surrounding limits. In the channel 12h, on the one hand, as shown in FIG. 1C, the height of the channel 12h gradually decreases from the opening 12p toward the inlet hole 11h, because the radially outer wall surface extends curvedly from the opening 12p toward the inlet hole 11h. Specifically, The radially outer wall surface extends from the opening 12p toward the other side in the circumferential direction (for example, the upstream side in the counterclockwise direction shown in FIGS. 1A to 1C ) while extending toward the radially inner side, whereby the radially outer wall surface serves to During the rotation of the fluid centripetal guide device 1 (for example, in the counterclockwise direction shown in FIGS. 1A to 1C ), the fluid flowing in from the opening 12p is guided toward the inlet hole 11h; on the other hand, as shown in FIG. 1D, the channel The (axial) width of 12h may gradually decrease (narrow) from the opening 12p towards the inlet hole 11h, thereby facilitating the flow of fluid from the opening 12p towards the inlet hole 11h.

In this embodiment, as shown in FIGS. 1A to 1C , the mounting portion 13 is fixed to the inner peripheral surface of the main body 11 and protrudes radially inward from the inner peripheral surface. The mounting portion 13 is staggered from the inlet hole 11h, and is located at a position corresponding to the guide surface 11s in the radial direction R, thereby improving the structural strength of the portion of the main body 11 where the guide surface 11s is formed by cutting. Furthermore, the mounting portion 13 is formed in a convex shape (flat key) extending along the axial direction A of the main body portion 11, and is used for mounting with the mounting groove 2c of the motor shaft 2 of the vehicle power system (wheel hub motor drive system) described below. (keyway) matching assembly.

The structure of the vehicle power system including the above-mentioned fluid centripetal guide device 1 will be described below with reference to the accompanying drawings.

(Vehicle power system according to an embodiment of the present application)

As shown in FIG. 2A , the vehicle power system according to an embodiment of the present application is an in-wheel motor drive system. The in-wheel motor drive system includes the above-mentioned fluid centripetal guide device 1, motor shaft 2, output shaft 3, assembled together. Bearing 4 and seal assembly 5. Specifically, the motor shaft 2 and the rotor of the driving motor can be transmission coupled through the rotor bracket, and the interior of the motor shaft 2 is formed into a hollow structure. The output shaft 3 and the hub of the wheel can be connected together through multiple connectors. The output shaft 3 can also be connected to the motor shaft 2 through a planetary gear reducer. A part of the output shaft 3 is inserted into the motor shaft 2. Furthermore, the bearing 4 can be a needle roller bearing, and the inner ring of the bearing 4 is fixed to the output shaft 3. The motor shaft 2 is also used as the outer ring of the bearing 4, so that the bearing 4 plays a radial support role. The bearing 4 is located in the installation space S between the motor shaft 2 and the output shaft 3. The sealing assembly 5 is located at the other axial end of the installation space S for sealing the other axial end of the installation space S.

In this embodiment, as shown in FIGS. 2A to 2C , the motor shaft 2 includes a flange part 21 , a first gear part 22 , a second gear part 23 and a bracket mounting part 24 .

The flange portion 21 protrudes toward the radially outer side relative to other parts of the motor shaft 2 , and the main body portion 11 of the fluid centripetal guide device 1 is sleeved and fixed on the radial outer side of the flange portion 21 . Since the flange portion 21 protrudes more toward the radially outer side, the guide portion 12 of the fluid centripetal guide device 1 rotates during the operation of the hub motor drive system, thereby repeatedly executing the instructions stored in the housing of the hub motor drive system. The action of scooping up the fluid further utilizes the rotation of the fluid centripetal guide device 1 to guide the cooling fluid to flow centripetally along the channel 12h. As shown in Figures 2B and 2C, three mounting grooves 2c are formed on the outer peripheral surface of the flange portion 21. The three mounting grooves 2c are evenly distributed in the circumferential direction C. The shape and size of each mounting groove 2c are consistent with the fluid. The mounting portion 13 of the centripetal guide device 1 has a corresponding shape and size. The mounting groove 2c has an opening that opens toward the axial side. The mounting portion 13 of the fluid centripetal guide device 1 can be inserted into and installed into the mounting groove 2c from the axial side through the opening of the mounting groove 2c.

In addition, as shown in FIGS. 2A to 2C , the motor shaft 2 is also formed with a guide hole 2h penetrating its wall. The opening of the guide hole 2 h that opens toward the radially outer side is located on the outer peripheral surface of the flange portion 21 and is used to communicate with the inlet hole 11 h of the main body portion 11 of the fluid centripetal guide device 1 . The opening of the guide hole 2 h that opens toward the radially inward side communicates with the installation space S between the motor shaft 2 and the input shaft, and is used to guide fluid toward the installation space S. Specifically, in this embodiment, the guide hole 2h extends obliquely from one axial side toward the other axial side while extending from the radially inner side toward the radial outer side.

Further, the first gear portion 22 is located on one axial side of the flange portion 21 , and the first gear portion 22 can be drivingly coupled with the sun gear of the planetary gear reducer. The second gear portion 23 is located at the other axial side of the flange portion 21 , and the second gear portion 23 can be drivingly coupled with the brake disc of the brake assembly. The bracket mounting part 24 is located between the flange part 21 and the second gear part 23, and the bracket mounting part 24 can be fixed with the rotor bracket.

By adopting the above solution, in the above-mentioned wheel hub motor drive system, when the wheel hub motor drive system is in the working state, the fluid centripetal guide device 1 rotates together with the motor shaft 2, and the guide part 12 can continuously move from the hub motor drive system to the hub motor drive system. The fluid (such as oil) is scooped up in the housing and further directed centripetally into the installation space S. During the above process, the flow path of the fluid is as follows: opening 12p of the guide part 12 → channel 12h of the guide part 12 → inlet hole 11h of the main body part 11 → guide hole 2h of the motor shaft 2 → installation space S → bearing 4 and seal assembly 5. In this way, the fluid can cool and lubricate the bearing 4 and seal assembly 5.

Specific embodiments according to the present application have been described in detail above, and supplementary descriptions will be provided below.

i. In the above specific embodiments, the structures closely related to the fluid centripetal guide device 1 of the present application are mainly described in detail, and the detailed description of other structures of the vehicle power system according to the present application is omitted. It can be understood that the in-wheel motor drive system as a vehicle power system according to an embodiment of the present application may also include a housing, a drive motor, a rotor bracket, a planetary gear reducer, a brake assembly, and other bearings and sealing assemblies.

ii. In the technical solution of the present application, the fluid can typically be oil stored in the oil tank at the bottom of the casing of the vehicle power system. The oil guided into the installation space S can not only be used to cool the bearing 4 and the seal assembly. 5, and can also lubricate the bearing 4 and seal assembly 5.

In addition, in the above specific embodiments, the bearing 4 uses the motor shaft 2 as the outer ring, but the application is not limited to this. The bearing 4 with an independent outer ring can also be used for radial support, and the outer ring can be connected with the motor. Shaft 2 is fixed together.

The bearing 4 itself may also have no outer ring or both the outer ring and the inner ring. For example, the bearing 4 may be a bearing including a plurality of rolling elements and a cage.

iii. It can be understood that the number and arrangement of the guide portions 12 of the fluid centripetal guide device 1 of the present application are not limited to those described in the above specific embodiments, but can be changed as needed. When the fluid centripetal guide device 1 of the above embodiment is installed, the opening 12p of the guide portion 12 can be oriented in the same direction as the rotation direction of the motor shaft 2 when the vehicle moves forward, that is, the opening 12p faces the rotation direction of the motor shaft 2 when the vehicle moves forward. on the downstream side.

In some cases, the fluid centripetal guide device 1 may include a plurality of guide portions 12 with openings 12p facing oppositely, so that the fluid centripetal guide device 1 can play a role of centripetally guiding the fluid regardless of the rotation direction of the fluid centripetal guide device 1 .

iv. In the technical solution of this application, there is no need to establish a seal and directional pressure in a closed space to pump fluid as in the prior art, so there is no need to set up a separate pump, thus saving the need to set up a separate pump and corresponding lines. and piping costs.

v. It can be understood that the fluid centripetal guiding device 1 of the present application is not limited to use. For example, it can also be applied to vehicle power systems such as electric axle drive systems and hybrid drive systems.

Claims

A fluid centripetal guiding device, characterized by including:

The main body part (11) has an annular shape and is formed with an inlet hole (11h) penetrating in the radial direction (R); and

A plurality of guide parts (12) arranged at intervals in the circumferential direction (C) of the main body part (11), the guide parts (12) being fixed to the main body part The outer peripheral surface of (11) protrudes toward the radially outer side from the outer peripheral surface. The guide portion (12) is formed with an opening (12p) and a channel (12h). The opening (12p) is open toward the circumferential side. , the channel (12h) extends from the opening (12p) to the inlet hole (11h), and the radially outer wall surface of the channel (12h) extends from the opening (12p) toward the inlet hole (11h) ) extends in a curved manner for guiding the fluid flowing in from the opening (12p) toward the inlet hole (11h) during the rotation of the fluid centripetal guide device (1).
The fluid centripetal guide device according to claim 1, characterized in that the radially outer wall surface extends from the opening (12p) toward the other circumferential side and extends toward the radially inner side.
The fluid centripetal guide device according to claim 1 or 2, characterized in that the width of the channel (12h) gradually narrows from the opening (12p) towards the inlet hole (11h), and the outer circumference The portion of the surface located within the channel (12h) is formed with a guide surface (11s) inclined towards the inlet hole (11h).
The fluid centripetal guide device according to any one of claims 1 to 3, characterized in that the fluid centripetal guide device (1) further includes a mounting portion (13), and the mounting portion (13) is fixed on The inner peripheral surface of the main body part (11) protrudes radially inward from the inner peripheral surface, and the mounting part (13) is staggered from the inlet hole (11h).
The fluid centripetal guide device according to claim 4, characterized in that the mounting portion (13) is formed in a convex shape extending linearly along the axial direction (A) of the main body portion (11).
A vehicle power system, characterized by comprising the fluid centripetal guide device (1) according to any one of claims 1 to 5.
The vehicle power system according to claim 6, characterized in that it further includes a motor shaft (2), the motor shaft (2) is formed into a hollow structure, and the motor shaft (2) is also formed with a wall portion penetrating it. guide hole (2h),

The fluid centripetal guide device (1) is fixed to the motor shaft (2), and the inlet hole (11h) of the fluid centripetal guide device (1) is connected with the guide hole (2h).
The vehicle power system according to claim 6 or 7, characterized in that the motor shaft (2) is formed with a flange portion (21), and the flange portion (21) is relative to the motor shaft (2). ) protrudes toward the radially outer side, and the main body portion (11) of the fluid centripetal guide device (1) is sleeved and fixed on the radial outer side of the flange portion (21).
The vehicle power system according to claim 8, characterized in that a mounting groove (2c) is formed on the outer peripheral surface of the flange portion (21), and the mounting groove (2c) faces one side in the axial direction or in the axial direction. The other side is open, and the convex strip-shaped mounting portion (13) of the fluid centripetal guide device (1) is installed in the mounting groove (2c).
The vehicle power system according to any one of claims 7 to 9, further comprising an output shaft (3), a bearing (4) and a sealing assembly (5), the bearing (4) being located on the The installation space (S) between the motor shaft (2) and the output shaft (3), the sealing assembly (5) is used to close one end of the installation space (S), the guide hole (2h) The fluid can be directed towards the installation space (S).