CN117318391A - Bridge drive system - Google Patents

Bridge drive system Download PDF

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Publication number
CN117318391A
CN117318391A CN202210696124.2A CN202210696124A CN117318391A CN 117318391 A CN117318391 A CN 117318391A CN 202210696124 A CN202210696124 A CN 202210696124A CN 117318391 A CN117318391 A CN 117318391A
Authority
CN
China
Prior art keywords
motor
cooling
transmission
cooling chamber
drive system
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
CN202210696124.2A
Other languages
Chinese (zh)
Inventor
刘磊
万丰榕
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 CN202210696124.2A priority Critical patent/CN117318391A/en
Publication of CN117318391A publication Critical patent/CN117318391A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20927—Liquid coolant without phase change

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The application proposes a bridge drive system comprising an electric motor (10) and a transmission (20), said transmission (20) being located at an axial end of said electric motor (10), said electric motor (10) comprising a rotor shaft (102), wherein said bridge drive system further comprises: -a motor main cooling chamber (R1), said motor main cooling chamber (R1) surrounding said motor (10); a motor end cooling cavity (R2), wherein the motor end cooling cavity (R2) is positioned at the other axial end of the motor (10), and the motor end cooling cavity (R2) is communicated with the motor main cooling cavity (R1); and a shaft cooling cavity (R3), the shaft cooling cavity (R3) penetrating through the rotor shaft (102), the shaft cooling cavity (R3) and the motor end cooling cavity (R2) being in communication, the motor main cooling cavity (R1), the motor end cooling cavity (R2) and the shaft cooling cavity (R3) being for the passage of a cooling liquid for cooling the motor (10).

Description

Bridge drive system
Technical Field
The present application relates to a bridge drive system.
Background
In order to increase the power density of the bridge drive system, higher demands are placed on the cooling of the bridge drive system. One possible bridge drive system provides water cooling channels in the motor housing to cool the motor stator and inverter. Another possible bridge drive system uses a hollow motor shaft that is cooled by water cooling. Another possible transmission of the bridge drive system is arranged between the motor and the controller, cooling the motor only by water cooling, and not cooling the motor shaft and the transmission.
The prior art bridge drive system has the following drawbacks.
(1) The absence of cooling of the transmission input shaft results in the transmission input shaft being susceptible to temperature increases that affect bridge performance.
(2) For high speed motors, the bearings of the input shaft of the transmission are prone to temperature increases, which can affect the service life of the bearings.
(3) For high speed motors, the oil seal between the transmission and the motor tends to increase in temperature, which can affect the service life of the oil seal.
(4) The motor stator and the motor shaft, the input shaft of the transmission are difficult to cool together.
Disclosure of Invention
The present application is directed to a bridge drive system that addresses or alleviates at least one of the shortcomings of the background art described above.
Embodiments of the present application provide a bridge drive system comprising an electric motor and a transmission located at one axial end of the electric motor, the electric motor comprising a rotor shaft,
wherein the bridge drive system further comprises:
a motor main cooling cavity surrounding the motor;
the motor end cooling cavity is positioned at the other axial end of the motor, and the motor end cooling cavity is communicated with the motor main cooling cavity; and
a shaft cooling cavity penetrating the rotor shaft, the shaft cooling cavity communicating with the motor end cooling cavity,
the motor main cooling cavity, the motor end cooling cavity and the shaft cooling cavity are used for cooling liquid to pass through so as to cool the motor.
In at least one possible embodiment, the motor comprises a cooling jacket and a motor end cap, the motor end cooling cavity being formed between the cooling jacket and the motor end cap, the motor end cap being provided with a motor end cap guide slot, the motor end cap guide slot forming a labyrinth.
In at least one possible embodiment, the bridge drive system further comprises a transmission end cooling chamber disposed at an axial end of the transmission, the transmission end cooling chamber and the shaft cooling chamber communicating.
In at least one possible embodiment, the transmission includes a transmission main housing and a transmission end cap, the transmission end cooling cavity is formed between the transmission main housing and the transmission end cap, the transmission end cap is provided with a transmission end cap guide slot, and the transmission end cap guide slot forms a labyrinth shape.
In at least one possible embodiment, the flow direction of the coolant in the radial direction of the motor is opposite in the motor end cooling chamber and the transmission end cooling chamber.
In at least one possible embodiment, the bridge drive system further comprises a stator end cavity disposed at one axial end of the electric machine, the stator end cavity being in communication with the electric machine main cooling cavity, the stator end cavity extending radially inward from the electric machine main cooling cavity.
In at least one possible embodiment, the electric machine comprises a machine main housing and a cooling jacket, the machine main cooling cavity being formed between the machine main housing and the cooling jacket, the cooling jacket being provided with cooling jacket guide grooves enabling the cooling liquid to flow in the axial and/or circumferential direction of the electric machine.
In at least one possible embodiment, the motor further comprises a power electronic device provided with a cooling flow passage, which is in communication with the motor main cooling cavity.
In at least one possible embodiment, the rotor shaft extends to the transmission while serving as an input shaft for the transmission.
In at least one possible embodiment, in the motor main cooling chamber and the shaft cooling chamber, the flow direction of the cooling liquid in the axial direction of the motor is opposite.
By adopting the technical scheme, the peripheral surface, the end surface and the motor shaft of the motor shell can be cooled simultaneously, the cooling effect is good, and the power density of the bridge driving system is high.
Drawings
Fig. 1 shows a partial schematic configuration of a bridge drive system according to an embodiment of the present application.
Fig. 2 shows a schematic structural view of a motor end cover of a bridge drive system according to an embodiment of the present application.
Fig. 3 shows a schematic structural view of a transmission end cap of a bridge drive system according to an embodiment of the present application.
Description of the reference numerals
10. Motor 101 rotor 102 rotor shaft 103 stator
20. Transmission 201 gear
30. Power electronic device
40. Vehicle cooling circuit
1. Liquid inlet of motor main shell 11
2. Cooling jacket 21 cooling jacket guide groove
3. Motor end cover 31 motor end cover guide groove
4. Transmission main casing
5. Liquid outlet of transmission end cover 51 and transmission end cover guide groove 52
R1 motor main cooling cavity R2 motor end cooling cavity R3 shaft cooling cavity R4 transmission end cooling cavity R5 stator end cavity
Aaxial R radial direction
Detailed Description
To more clearly illustrate the above objects, features and advantages of the present application, specific embodiments of the present application are described in detail in this section in conjunction with the accompanying drawings. The present application can be embodied in other different forms besides the embodiments described in this section, and those skilled in the art may make corresponding modifications, variations, and substitutions without departing from the spirit of the application, so that the application is not limited to the specific examples disclosed in this section. The protection scope of the present application shall be subject to the claims.
As shown in fig. 1-3, embodiments of the present application propose a bridge drive system that may include a motor 10, a transmission 20, and power electronics 30 (PEU, power electronics unit).
The transmission 20 may be located at one axial end (right end in fig. 1) of the motor 10, the motor 10 and the transmission 20 may be connected together, the transmission 20 being used to change the rotational speed/torque or the like output from the motor 10. The power electronics device 30 may be provided with a cooling flow passage through which a cooling liquid can flow, and the cooling liquid flowing through the cooling flow passage may cool the power electronics device 30.
As an example, the transmission 20 may be connected to wheels of a vehicle, and the bridge drive system may be used for a power unit of a pure electric vehicle or a hybrid vehicle or the like. The bridge drive system may be connected to the vehicle cooling circuit 40 to circulate the coolant.
It is understood that the bridge drive system or its cooling flow path may also form a circulation loop for the cooling fluid alone, i.e. the bridge drive system or its cooling flow path is not connected to the vehicle cooling circuit 40.
The cooling flow path of the bridge drive system and/or the vehicle cooling circuit 40 may include a coolant storage unit and a coolant drive unit such as a pump.
The motor 10 may include a motor main housing 1, a cooling jacket 2, a motor end cover 3, a rotor 101, a rotor shaft 102, and a stator 103.
The stator 103 may be connected to the cooling jacket 2, the rotor 101 may be connected to the rotor shaft 102, and the rotor 101 is located radially inside the stator 103. The rotor shaft 102 is rotatably connected to a housing of a bridge drive system, which may include a motor main housing 1, a cooling jacket 2, and a transmission main housing 4 described later, with respect to a stator 103.
The motor main housing 1 may be integrally disposed radially outside the cooling jacket 2, and a cylindrical motor main cooling chamber R1 may be formed between the motor main housing 1 and the cooling jacket 2, and the motor 10 may be cooled by the coolant flowing through the motor main cooling chamber R1.
The motor main housing 1 is provided with a liquid inlet 11, the liquid inlet 11 can be located at one axial side of the motor main housing 1, and cooling liquid can enter the motor main cooling cavity R1 from the liquid inlet 11.
Alternatively, a cooling jacket guide 21, for example, a spiral shape or a labyrinth shape, may be provided on the outer peripheral surface of the cooling jacket 2, and the cooling jacket guide 21 allows the cooling liquid to flow from one axial end (right end in fig. 1) of the motor 10 to the other axial end (left end in fig. 1) of the motor and around the motor 10 in the motor main cooling chamber R1, thereby increasing the contact area of the cooling liquid and the cooling jacket 2 and enhancing the cooling effect. As an example, the cooling jacket guide 21 may be spiral, and the cooling liquid may flow spirally along the cooling jacket guide 21 from one axial end of the motor 10 to the other axial end of the motor.
Further, one end (end near the transmission 20) of the cooling jacket 2 may be provided with a stator end chamber R5 extending radially inward, the stator end chamber R5 communicating with the motor main cooling chamber R1. The stator end chamber R5 may guide the cooling liquid to the end face of the cooling jacket 2. The cooling fluid of the stator end cavity R5 may enhance the cooling effect for the stator (in particular the end windings of the stator) of the electric machine 10. The liquid inlet 11 can be directly communicated with the stator end cavity R5, so that the cooling liquid directly enters the stator end cavity R5 from the liquid inlet 11 and then flows in the main cooling cavity R1 of the motor along the axial direction A, and the circulating flow of the cooling liquid is facilitated.
At the other axial end (left end in fig. 1) of the motor 10, a seal ring may be provided between the motor main case 1 and the cooling jacket 2, which may prevent the cooling liquid from entering the inside of the motor 10 (cooling jacket 2).
The motor end cover 3 may be connected to the other axial end (left end in fig. 1) of the motor main casing 1, and the motor end cover 3 and the motor main casing 1 enclose a motor end cooling chamber R2. The radially outer region of the motor end cooling chamber R2 communicates with the motor main cooling chamber R1.
Rotor shaft 102 may be a hollow shaft, rotor shaft 102 having a shaft cooling chamber R3 extending in an axial direction a, and a cooling fluid may flow unidirectionally along shaft cooling chamber R3. The rotor shaft 102 may extend to the transmission 20 as an input shaft of the transmission, so that the cooling fluid flowing through the shaft cooling chamber R3 may cool the input stage gears of the transmission 20.
The rotor shaft 102 may be sleeved with a plurality of bearings, and the cooling fluid flowing through the shaft cooling cavity R3 may cool the bearings, so that the service life of the bearings is longer.
As shown in fig. 2, the motor end cover 3 is provided with a motor end cover guide groove 31, and the motor end cover guide groove 31 may be formed in a spiral labyrinth shape, for example. At the motor end cooling chamber R2, the cooling fluid may flow helically under the guidance of the motor end cap guide groove 31.
The start end of the motor end cover guide groove 31 communicates with the motor main cooling chamber R1, and the start end of the motor end cover guide groove 31 may be located at the upper portion of the motor end cover 3. The terminal end of the motor end cap guide groove 31 communicates with the shaft cooling chamber R3. The start end of the motor end cover guide groove 31 may be located radially outward of the finish end of the motor end cover guide groove 31, and in the radial direction R of the motor 10, the coolant may flow from the radial direction outer side of the motor to the radial direction inner side of the motor along the motor end cover guide groove 31 in the motor end portion cooling chamber R2.
The transmission 20 may include a transmission main housing 4, a transmission end cap 5, and a plurality of gears 201, at least one gear (input stage gear) of the plurality of gears 201 may be connected to the rotor shaft 102. The gear 201 may be provided inside the transmission main casing 4.
A transmission end cap 5 may be provided at one end (right end in fig. 1) of the transmission main casing 4, the transmission end cap 5 and the transmission main casing 4 enclosing a transmission end cooling chamber R4. The central region of the transmission end cooling chamber R4 communicates with the shaft cooling chamber R3. The coolant can flow unidirectionally in the axial direction a in the shaft cooling chamber R3, and flow from the motor end cooling chamber R2 at the other end in the axial direction to the transmission end cooling chamber R4 at the one end in the axial direction.
As shown in fig. 3, the transmission end cover 5 is provided with a transmission end cover guide groove 51, and the transmission end cover guide groove 51 may be formed in a spiral labyrinth shape, for example. At the end of the transmission cooling chamber R4, the coolant may flow helically under the guidance of the transmission end cap guideway 51.
The beginning of the transmission end cap guide 51 communicates with the shaft cooling chamber R3, and the beginning of the transmission end cap guide 51 may be located in the central region of the transmission end cap 5. The end of the transmission end cap guide groove 51 is provided with a liquid outlet 52, and the liquid outlet 52 may be located at the lower portion of the transmission end cap 5.
The start end of the transmission end cover guide groove 51 is located radially inward of the end of the transmission end cover guide groove 51, and in the radial direction R of the motor 10, the coolant can flow along the transmission end cover guide groove 51 from the radially inward side of the motor to the radially outward side of the motor in the transmission end cooling chamber R4.
As shown in fig. 1, a seal ring 12 (oil seal) may be provided between one end of the cooling jacket 2 and the rotor shaft 102, and the seal ring 12 may prevent oil in the transmission 20 from entering the inside of the motor 10 (cooling jacket 2).
Other locations of the rotor shaft 102 may also be provided with sealing rings, for example between the rotor shaft 102 and the transmission main housing 4, and between the rotor shaft 102 and the other end of the cooling jacket 2, which sealing rings may prevent coolant from entering the interior of the transmission 20 or the motor 10. The cooling liquid passing through the shaft cooling cavity R3 can cool the sealing ring sleeved on the rotor shaft 102, so that the service life of the sealing ring is longer.
The unidirectional arrows in fig. 1 indicate the flow direction of the coolant, and the flow process of the coolant is described below with reference to fig. 1.
The cooling liquid in the vehicle cooling circuit 40 flows through the cooling flow passage of the power electronics device 30 and then flows into the motor main cooling chamber R1 and the stator end chamber R5 through the liquid inlet 11. In the motor main cooling chamber R1, part of the cooling liquid can flow from one axial end to the other axial end and flow into the motor end cooling chamber R2, and in the motor end cooling chamber R2, the cooling liquid can flow from the radial outside to the radial inside along the motor end cover guide groove 31. The cooling fluid in the motor main cooling chamber R1, the motor end cooling chamber R2 and the stator end chamber R5 can cool the motor stator and rotor. The coolant flows from the motor end cooling chamber R2 into the shaft cooling chamber R3, and the coolant flowing into the shaft cooling chamber R3 can cool the rotor shaft 102 (including the input shaft of the transmission 20). The coolant flows along the shaft cooling chamber R3 to the transmission end cooling chamber R4, thereby cooling the transmission 20.
It will be appreciated that the heat generated by the motor 10 is greater than the heat generated by the transmission 20, so that the cooling fluid flows through the motor 10 and then through the transmission 20 in the embodiment of the present application, and the cooling effect is better.
The present application may be particularly applicable to bridge drive systems for offset bridges.
The present application can obtain the following advantageous effects.
(1) Simultaneously, the motor shell and the motor shaft (comprising the input shaft of the transmission) are cooled, the cooling effect is good, and the power density of the bridge driving system can be high.
(2) According to the electric bridge driving system, on the premise that the axial size of the electric bridge driving system is not increased (or is increased little), the heat exchange area is increased through the guide grooves of the motor end cover 3 and the transmission end cover 5, and the cooling effect of the electric bridge driving system is good.
(3) The stator 103, rotor shaft 102 (including transmission input shaft), transmission main housing 4, bearings and oil seal are cooled in the same liquid cooling circuit, so that multiple components can be cooled together, and the service lives of the bearings and oil seal are longer.
While the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application as defined by the claims. Accordingly, the descriptions in this specification are for purposes of illustration and are not intended to be limiting in any way.

Claims (10)

1. A bridge drive system comprising an electric motor (10) and a transmission (20), said transmission (20) being located at one axial end of said electric motor (10), said electric motor (10) comprising a rotor shaft (102),
wherein the bridge drive system further comprises:
-a motor main cooling chamber (R1), said motor main cooling chamber (R1) surrounding said motor (10);
a motor end cooling cavity (R2), wherein the motor end cooling cavity (R2) is positioned at the other axial end of the motor (10), and the motor end cooling cavity (R2) is communicated with the motor main cooling cavity (R1); and
a shaft cooling chamber (R3), said shaft cooling chamber (R3) extending through said rotor shaft (102), said shaft cooling chamber (R3) communicating with said motor end cooling chamber (R2),
the motor main cooling chamber (R1), the motor end cooling chamber (R2) and the shaft cooling chamber (R3) are provided for the passage of a cooling liquid for cooling the motor (10).
2. Bridge drive system according to claim 1, characterized in that the motor (10) comprises a cooling jacket (2) and a motor end cap (3), the motor end cooling chamber (R2) being formed between the cooling jacket (2) and the motor end cap (3), the motor end cap (3) being provided with a motor end cap guide groove (31), the motor end cap guide groove (31) forming a labyrinth.
3. The bridge drive system according to claim 1, further comprising a transmission end cooling chamber (R4) provided at an axial end of the transmission (20), the transmission end cooling chamber (R4) and the shaft cooling chamber (R3) communicating.
4. A bridge drive system according to claim 3, wherein the transmission (20) comprises a transmission main housing (4) and a transmission end cap (5), the transmission end cooling chamber (R4) being formed between the transmission main housing (4) and the transmission end cap (5), the transmission end cap (5) being provided with a transmission end cap guide groove (51), the transmission end cap guide groove (51) forming a labyrinth.
5. A bridge drive system according to claim 3, characterized in that in the motor end cooling chamber (R2) and the transmission end cooling chamber (R4) the flow direction of the cooling liquid in the radial direction (R) of the motor (10) is opposite.
6. Bridge drive system according to claim 1, characterized in that it further comprises a stator end chamber (R5) arranged at one axial end of the electric machine (10), the stator end chamber (R5) being in communication with the machine main cooling chamber (R1), the stator end chamber (R5) extending radially inwards from the machine main cooling chamber (R1).
7. Bridge drive system according to claim 1, characterized in that the motor (10) comprises a motor main housing (1) and a cooling jacket (2), the motor main cooling chamber (R1) being formed between the motor main housing (1) and the cooling jacket (2), the cooling jacket (2) being provided with cooling jacket guide grooves (21), which cooling jacket guide grooves (21) enable the cooling liquid to flow in the axial direction (a) and/or the circumferential direction of the motor.
8. Bridge drive system according to claim 1, further comprising power electronics (30), the power electronics (30) being provided with a cooling flow channel, which cooling flow channel communicates with the motor main cooling chamber (R1).
9. The bridge drive system according to claim 1, characterized in that the rotor shaft (102) extends to the transmission (20) while serving as an input shaft for the transmission (20).
10. Bridge drive system according to claim 1, characterized in that in the motor main cooling chamber (R1) and the shaft cooling chamber (R3) the flow direction of the cooling liquid in the axial direction (a) of the motor is opposite.
CN202210696124.2A 2022-06-20 2022-06-20 Bridge drive system Pending CN117318391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210696124.2A CN117318391A (en) 2022-06-20 2022-06-20 Bridge drive system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210696124.2A CN117318391A (en) 2022-06-20 2022-06-20 Bridge drive system

Publications (1)

Publication Number Publication Date
CN117318391A true CN117318391A (en) 2023-12-29

Family

ID=89272394

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210696124.2A Pending CN117318391A (en) 2022-06-20 2022-06-20 Bridge drive system

Country Status (1)

Country Link
CN (1) CN117318391A (en)

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