CN111114262A

CN111114262A - Electric bridge driving system and vehicle

Info

Publication number: CN111114262A
Application number: CN201811277690.XA
Authority: CN
Inventors: 张军辉; 张仁; 高华
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2020-05-08

Abstract

The invention relates to an electric bridge driving system and a vehicle. The bridge driving system comprises a driving motor, a transmission device, a motor controller and a motor shell, wherein the driving motor is installed in the motor shell, the motor controller controls the driving motor to output torque through the transmission device, the driving motor and the transmission device are arranged on the same rotation axis, and the motor controller is installed on the outer side of the motor shell in parallel with the rotation axis. The electric bridge driving system and the vehicle have compact structures and are convenient to assemble.

Description

Electric bridge driving system and vehicle

Technical Field

The invention relates to the technical field of vehicles. In particular, the present invention relates to an electric bridge drive system and a vehicle comprising such an electric bridge drive system.

Background

In the drive axle system of the current electric vehicle, the transmission is often arranged separately from the drive motor and the parking system. The motor separates from the drive axle, which not only causes the matching problem of the motor, but also brings the problem of the connection between the motor and the shell of the drive axle.

CN 103496320B discloses a new forms of energy drive axle assembly, its motor, reduction gear, differential three parallel arrangement, motor controller also separates with the motor, greatly increased the whole radial dimension of system, and the installation is not convenient moreover.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide an integrated bridge driving system and a vehicle with compact structure.

The above technical problem is solved by a bridge driving system according to the present invention. The bridge driving system comprises a driving motor, a transmission device, a motor controller and a motor shell, wherein the driving motor is installed in the motor shell, the motor controller controls the driving motor to output torque through the transmission device, the driving motor and the transmission device are arranged on the same rotation axis, and the motor controller is installed on the outer side of the motor shell in parallel with the rotation axis. The motor and the transmission device are coaxially arranged, so that the whole structure of the driving system is more compact, the radial size is greatly reduced, components such as a motor controller and the like can be integrated on the radial outer side of the driving system, and the integration level of the system is further improved.

According to a preferred embodiment of the invention, the resolver is arranged coaxially with the drive motor on the side of the drive motor facing away from the transmission. The resolver may be used for rotational speed detection of the motor output shaft. Preferably, the bridge drive system further includes a parking device that is located between the drive motor and the resolver and that is arranged coaxially with the output shaft of the drive motor. The magnetic field generated by the driving motor can cause interference to the rotary transformer, the measurement accuracy is influenced, the parking device is integrated between the driving motor and the rotary transformer, the structure of a driving system can be more compact, the magnetic field of the driving motor can be shielded, and the electromagnetic interference protection is provided for the rotary transformer.

According to a further preferred embodiment of the invention, the bridge drive system further has a transmission housing connected to the motor housing, the transmission being mounted in the transmission housing. The motor housing and the transmission housing are fastened together, for example by means of bolts, together forming an inner space enclosing the drive system.

According to another preferred embodiment of the invention, the transmission comprises a transmission and a differential. The transmission changes the speed of the output torque of the driving motor, and the differential coordinates the asynchronous rotating speeds of the left wheel and the right wheel. Preferably, the transmission is a planetary gear train. The planetary gear train can be arranged coaxially with the driving motor, so that the radial space is saved, and a higher transmission ratio can be realized.

According to another preferred embodiment of the invention, the high voltage line of the motor controller is directly connected to the drive motor. Because the motor controller is arranged on the motor shell, the high-voltage wire of the motor controller can be directly led into the motor, thereby simplifying the wiring and saving the cable interface on the motor shell.

According to another preferred embodiment of the invention, the cooling pipe outlet of the motor controller is directly connected to the cooling pipe inlet of the drive motor. Also, since the motor controller is mounted on the motor housing, the cooling pipe of the motor controller can be directly connected to the cooling pipe of the driving motor, thereby eliminating the intermediate connecting line.

The above technical problem is also solved by a vehicle according to the present invention, comprising an electric bridge drive system having the above features.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

FIG. 1 is a cross-sectional view of a bridge drive system according to an embodiment of the present invention;

FIG. 2a is a front view of a bridge drive system according to an embodiment of the present invention; and

FIG. 2b is a perspective view of a bridge drive system according to an embodiment of the present invention.

Detailed Description

FIG. 1 is a cross-sectional view of a bridge drive system according to an embodiment of the present invention. As shown in fig. 1, the bridge drive system is integrated with a drive motor 1, a transmission, and a motor controller 5. Wherein the drive motor 1 comprises a stator 2 and a rotor 3, and the transmission comprises a transmission 6 and a differential 7. The transmission 6 is a planetary gear train. The differential 7 is provided with two half shafts 14, and the driving motor 1 and the transmission 6 are coaxially sleeved on the long half shaft 14 of the differential 7. The drive motor 1 is enclosed on the outside by a motor housing 8, the transmission is enclosed on the outside by a transmission housing 9, and the motor housing 8 and the transmission housing 9 are connected, for example by bolts, to form a common housing part. The motor housing 8 also has a motor end plate 11 for facilitating the attachment and detachment of the drive motor 1. The stator 2 of the drive motor 1 is fixed inside the motor housing 8, and a cooling water jacket 10 for cooling the drive motor 1 is provided between the stator 2 and the motor housing 8. The rotor 3 of the drive motor 1 is connected coaxially and rotationally fixed to a hollow motor shaft 4. The motor shaft 4 is an output shaft of the driving motor 1, and transmits the torque of the driving motor 1 to the transmission device. The long half shaft 14 passes coaxially through the motor shaft 4. The rotary transformer 13 is located on one side of the driving motor 1, which faces away from the transmission device, and is sleeved outside the motor shaft 4 along the rotation axis. Preferably, a parking device 12 is provided between the resolver 13 and the drive motor 1, and the parking device 12 includes a parking gear coaxially provided on the motor shaft 4 and a parking actuator mounted on a motor end plate. The parking motor drives the parking actuating mechanism to be jointed with the parking gear, so that the parking brake is realized. The parking device 12 can shield the electromagnetic field generated by the driving motor 1, and prevent the driving motor 1 from causing electromagnetic interference to the resolver 13. The motor controller 5 is installed on the radially outer side of the motor housing 8 in parallel with the rotational axis of the drive motor 1, and the high-voltage wire of the motor controller 5 directly enters the motor housing 8 to be connected with the drive motor 1, thereby reducing the number of cables and connectors.

Fig. 2a and 2b are front and perspective views, respectively, of a bridge drive system according to an embodiment of the present invention. As shown in fig. 2a and 2b, the cooling pipe of the motor controller 5 is directly connected to the cooling pipe of the driving motor 1 to form a complete cooling passage. The cooling fluid enters the motor controller 5 through a cooling fluid inlet 14 on the motor controller 5, then flows out of the motor controller 5 through a cooling fluid channel 15 to directly enter the driving motor 1, and finally flows out of the driving motor 1 through a cooling fluid outlet 16 on the motor housing 8. This design simplifies the coolant flow path and saves cooling pipes between the motor controller 5 and the drive motor 1.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

Reference numerals

1 drive motor

2 stator

3 rotor

4 Motor shaft

5 Motor controller

6 speed variator

7 differential mechanism

8 motor casing

9 Transmission device shell

10 cooling water jacket

11 end plate of motor

12 parking device

13 rotary transformer

14 cooling liquid inlet

15 passage for cooling liquid

16 outlet for cooling liquid

Claims

1. A bridge driving system comprises a driving motor (1), a transmission device, a motor controller (5) and a motor shell (8), wherein the driving motor (1) is installed in the motor shell (8), the motor controller (5) controls the driving motor (1) to output torque through the transmission device,

it is characterized in that the preparation method is characterized in that,

the drive motor (1) and the transmission are arranged coaxially with respect to a rotational axis, and the motor controller (5) is mounted parallel to the rotational axis on the outer side of the motor housing (8).

2. Bridge drive system according to claim 1, further comprising a rotary transformer (13), the rotary transformer (13) being arranged coaxially with the drive motor (1) on a side of the drive motor (1) facing away from the transmission means.

3. Bridge drive system according to claim 2, characterized in that it further comprises a parking device (12), said parking device (12) being located between the drive motor (1) and the rotary transformer (13), and said parking device (12) being arranged coaxially with the output shaft of the drive motor (1).

4. The bridge drive system according to claim 1, further having a transmission housing (9) connected to the motor housing (8), the transmission being mounted in the transmission housing (9).

5. Bridge drive system according to claim 1, wherein the transmission means comprise a transmission (6) and a differential (7).

6. Bridge drive system according to claim 5, wherein the transmission (6) is a planetary gear train.

7. Bridge drive system according to claim 1, wherein the high voltage line of the motor controller (5) is directly connected to the drive motor (1).

8. Bridge drive system according to one of claims 1-7, wherein the cooling duct outlet of the motor controller (5) is directly connected to the cooling duct inlet of the drive motor (1).

9. A vehicle comprising an electric bridge drive system according to one of claims 1 to 8.