A new energy electric drive axle tractor with reasonable arrangement of motor three-phase lines

Abstract

The present invention provides a new energy electric-drive axle tractor with a rationally arranged motor three-phase line arrangement, relating to the technical field of heavy-duty commercial vehicles. The solution adopted is as follows: comprising a vehicle frame, on which a motor controller, a mid-bridge, and a rear axle are sequentially mounted from front to back; the motor controller is connected to the front motor and the rear motor of the mid-bridge via a mid-bridge motor three-phase line group, which is provided with a mid-bridge fixed bracket; the mid-bridge motor three-phase line group passes through the mid-bridge fixed bracket and then branches into two wire harnesses with different directions behind the mid-bridge fixed bracket; the motor controller is connected to the front motor and the rear motor of the rear axle via a rear axle motor three-phase line group, which is provided with a rear axle fixed bracket; the rear axle motor three-phase line group passes through the rear axle fixed bracket and then branches into two wire harnesses with different directions. The effect brought by the present invention is to prevent the problem of high-voltage terminals being pulled or water entering the terminals.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy-duty commercial vehicles, and in particular to a new energy electric drive axle tractor with rationally arranged three-phase lines of a motor. Background Art

[0002] Currently, there are many heavy-duty new energy vehicles with electric drive axles on the market. Compared with previous new energy vehicles with central direct drive or motor-transmission solutions, electric drive axle vehicles have great advantages. On the one hand, they can reduce the volume and weight of the assembly and increase the power, volume and torque density of the system. In this way, the electric drive axle solution saves a lot of layout space, which greatly solves the problem of crowded layout of high-voltage components in new energy commercial vehicles. The saved space can be used to arrange batteries, increase the driving range of new energy commercial vehicles, and greatly increase the competitiveness of the product. On the other hand, the central direct drive solution or the motor-transmission solution often uses a larger power motor, but in actual operating conditions, the required power is relatively small, resulting in a low actual load rate of the motor. Therefore, the electric drive axle can avoid such problems by adopting a dual electric drive axle solution. When the required power is low, one motor is used for drive, and when the required power is high, two motors are used for drive.

[0003] However, there are also many problems for electric drive axle commercial vehicles, among which the layout of the motor three-phase line is one of them. Because the structure of the electric drive axle is deeply integrated with the motor and the axle, the motor is generally located on the middle bridge or the rear axle, located at the rear section of the vehicle, and the motor controller of the general electric drive axle commercial vehicle is arranged in the front section or the middle section. In this way, the three-phase line of the motor is generally connected from the middle section to the rear section, so the three-phase line of the motor is connected from the middle section to the rear section. The three-phase line harness is long, causing problems in the wiring of the three-phase line of the electric drive axle traction vehicle motor, such as Figure 1 and Figure 2 As shown, this is a dual-bridge dual-motor controller, with two motors on each bridge. This means there are 12 three-phase motor wires, which are divided into groups of 6 and arranged on the left and right sides of the beam. This solution has the following obvious disadvantages: the motor three-phase wires are prone to pulling at the interface at the motor end, because the structure of the electric drive bridge is that the motor and the axle are deeply integrated into one. Therefore, when the vehicle is running, the motor will vibrate along with the bridge housing, so the motor three-phase wires will also vibrate. Therefore, a corresponding margin must be left when arranging the motor three-phase wires. However, for the existing technical solution, even if enough wiring harness margin is left, pulling will occur at the motor interface. The reason is that when the vehicle is running, the motor three-phase wires and the motor form relative motion, so the wiring harness interface is also the high-voltage wiring harness terminal, which is also the weakest link in the wiring harness pulling. Therefore, the vibration of the three-phase wires can easily cause the high-voltage terminal to be pulled or water to enter the terminal.

[0004] Therefore, in view of the current situation that when the vehicle is running, the three-phase wires of the motor and the motor form relative movement, which easily causes the high-voltage terminals to be pulled or water to enter the terminals, it is an urgent problem to develop a new energy electric drive axle tractor with a reasonable arrangement of the three-phase wires of the motor. Summary of the Invention

[0005] The purpose of the present invention is to propose and design a new energy electric drive axle tractor with a reasonable arrangement of the three-phase wires of the motor, in order to solve the problem that the three-phase wires of the motor and the motor form relative movement when the existing new energy electric drive axle tractor are driving, which is prone to pulling of the high-voltage terminals or water ingress of the terminals.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a new energy electric drive bridge tractor with a reasonable arrangement of the three-phase line of the motor, including a frame, on which a motor controller, a middle bridge and a rear bridge are installed in sequence from front to back, the front of the middle bridge is installed with a middle bridge front motor, the rear of the middle bridge is installed with a middle bridge rear motor, the front of the rear axle is installed with a rear axle front motor, and the rear of the rear axle is installed with a rear axle rear motor. The motor controller is connected to the middle bridge front motor and the middle bridge rear motor through a middle bridge motor three-phase line group, a middle bridge fixed bracket is provided on the middle bridge motor three-phase line group, and the middle bridge motor three-phase line group is divided into two wire harnesses with different directions behind the middle bridge fixed bracket after passing through the middle bridge fixed bracket, namely the middle bridge front motor three-phase line and the middle bridge rear motor three-phase line. The middle bridge front motor three-phase line is connected to the middle bridge front motor, and the middle bridge rear motor three-phase line It is connected to the rear motor of the mid-axle, and the mid-axle fixing bracket is connected to the mid-axle. The three-phase wire group of the mid-axle motor has a three-phase wire harness margin in front of the mid-axle fixing bracket (referring to the slack section of the wire harness. Because the wire harness is long, the excess part after connection is concentrated here to form a three-phase wire harness margin); the motor controller is connected to the front motor of the rear axle and the rear motor of the rear axle through the rear axle motor three-phase wire group. A rear axle fixing bracket is provided on the rear axle motor three-phase wire group. The rear axle motor three-phase wire group is divided into two wire harnesses with different directions after the rear axle fixing bracket, namely the rear axle front motor three-phase wire and the rear axle rear motor three-phase wire. The rear axle front motor three-phase wire is connected to the rear axle front motor, and the rear axle rear motor three-phase wire is connected to the rear axle rear motor. The rear axle fixing bracket is connected to the rear axle, and the rear axle motor three-phase wire group has a three-phase wire harness margin in front of the rear axle fixing bracket. In this way, the wiring harness of the motor's three-phase wires from the OT terminal of the motor junction box to the fixed bracket on the bridge body vibrates up and down with the motor. When the car moves, the motor will vibrate up and down with the bridge body. The motor's three-phase wires around the motor are fixed on the motor and therefore have no relative movement with respect to the motor. In this way, the OT terminal of the motor's three-phase wires will not be pulled or water will enter.

[0007] Furthermore, a first frame-mounted bracket is provided on the three-phase wiring assembly of the mid-axle motor. The first frame-mounted bracket is located in front of the mid-axle bracket. The remaining wiring harness of the three-phase wiring assembly of the mid-axle motor is located between the mid-axle bracket and the first frame-mounted bracket. The first frame-mounted bracket is connected to the vehicle frame. A second frame-mounted bracket is provided on the three-phase wiring assembly of the rear-axle motor. The second frame-mounted bracket is located in front of the rear-axle bracket. The remaining wiring harness of the three-phase wiring assembly of the rear-axle motor is located between the rear-axle bracket and the second frame-mounted bracket. The second frame-mounted bracket is connected to the vehicle frame. The remaining wiring harness of the three-phase wiring assembly is constrained to the corresponding position.

[0008] Because the three-phase line of the motor in the prior art runs on the left and right sides of the frame, Figure 1 As shown, the space occupied by the system is relatively large, and the routing of the vehicle's water lines and low-voltage wiring harness is severely limited, leading to interference between the water pipes, low-voltage wiring harness, and high-voltage wiring harness. Further improvements include arranging the three-phase wiring group of the mid-axle motor in an upper-lower arrangement, with the three-phase wiring group of the mid-axle front motor and the three-phase wiring group of the mid-axle rear motor arranged in upper-lower layers in front of the mid-axle fixed bracket; and arranging the three-phase wiring group of the rear-axle motor in an upper-lower arrangement, with the three-phase wiring group of the rear-axle front motor and the three-phase wiring group of the rear motor arranged in upper-lower layers in front of the rear-axle fixed bracket. Furthermore, water pipes and low-voltage wiring harnesses are installed on the vehicle frame, located on the left side of the frame, while the three-phase wiring group of the mid-axle and rear-axle three-phase wiring harnesses are both arranged on the right side of the frame. This prevents the three-phase wiring group of the motor from occupying a large space, causing interference with the water pipes and low-voltage wiring harness, and prevents the wiring harness from being pulled and water from entering the wiring harness terminals.

[0009] Furthermore, the three-phase wiring harness margin is shaped like an upward curve. Because the three-phase wiring harness margin moves up and down during vehicle operation, sufficient margin is required to allow for this movement. Furthermore, the three-phase wiring harnesses at these two locations must closely track the motion of the center and rear axles to avoid significant pulling and throwing forces. Generally, the OT terminal trajectory of the motor junction box is simulated accordingly, and the three-phase wiring harness margin is determined based on the corresponding motor junction box trajectory.

[0010] Furthermore, restraint brackets are provided on the three-phase wires of the front motor of the middle bridge, the three-phase wires of the rear motor of the middle bridge, the three-phase wires of the front motor of the rear bridge and the three-phase wires of the rear motor of the rear bridge to restrain the three-phase wires and avoid them from being scattered.

[0011] It can be seen from the above technical solutions that the present invention has the following advantages:

[0012] This solution provides a new energy electric-drive axle tractor with a reasonable arrangement of the motor three-phase wires. On the one hand, it can make the motor three-phase wires from the OT terminal of the motor junction box to the fixed bracket on the bridge body vibrate up and down with the motor. In this way, when the car moves, the motor will vibrate up and down with the bridge body. Because the motor three-phase wires around the motor are fixed on the motor, there is no relative movement relative to the motor. In this way, the OT terminal of the motor three-phase wires will not be pulled or water will not enter. On the other hand, it prevents the motor three-phase wires from occupying a large space, causing interference with water pipes and low-voltage wires, and prevents the wires from being pulled and water from entering the wire harness terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 and Figure 2 This is a schematic diagram of the wiring structure of the prior art.

[0015] Figure 3 It is a side view of a specific embodiment of the present invention.

[0016] Figure 4 It is a top view of a specific embodiment of the present invention.

[0017] Figure 5 It is a structural schematic diagram of the three-phase line group of the axle motor and the three-phase line group of the rear axle motor in a specific embodiment of the present invention.

[0018] Figure 6 This is an enlarged view of the front motor of the mid-bridge in a specific embodiment of the present invention.

[0019] Figure 7 This is a schematic diagram of the wiring structure of one of the high-voltage wires of the motor's three-phase line.

[0020] In the figure, 1. Motor controller, 2. Three-phase wire group of mid-bridge motor, 3. Front motor of mid-bridge, 4. Mid-bridge, 5. Rear motor of rear axle, 6. Front motor of rear axle, 7. Rear axle, 8. Rear motor of rear axle, 9. Three-phase wire group of rear axle motor, 10. Frame, 11. Three-phase wire of front motor of mid-bridge, 12. Three-phase wire of rear motor of mid-bridge, 13. Three-phase wire of front motor of rear axle, 14. Three-phase wire of rear motor of rear axle, 15. Three-phase wire harness margin, 16. Mid-bridge fixing bracket, 17. Rear axle fixing bracket, 18. First frame fixing bracket, 19. Second frame fixing bracket, 20. OT terminal. DETAILED DESCRIPTION

[0021] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0022] like Figures 3 to 6As shown, this specific embodiment provides a new energy electric drive bridge tractor with a reasonable arrangement of motor three-phase lines, including a frame 10, on which a motor controller 1, a middle bridge 4 and a rear bridge 7 are installed in sequence from front to back, the front of the middle bridge 4 is installed with a middle bridge front motor 3, the rear of the middle bridge 4 is installed with a middle bridge rear motor 5, the front of the rear bridge 7 is installed with a rear bridge front motor 6, and the rear of the rear bridge 7 is installed with a rear bridge rear motor 8. The motor controller 1 is connected to the middle bridge front motor 3 and the middle bridge rear motor 5 through a middle bridge motor three-phase line group 2, and a middle bridge fixed bracket 16 is provided on the middle bridge motor three-phase line group 2. After passing through the middle bridge fixed bracket 16, the middle bridge motor three-phase line group 2 is divided into two wire harnesses with different directions behind the middle bridge fixed bracket 16, namely, a middle bridge front motor three-phase line 11 and a middle bridge rear motor three-phase line 12. The middle bridge front motor three-phase line 11 is connected to the middle bridge front motor 3, and the middle bridge rear motor three-phase line 12 is connected to the middle bridge rear motor 5 is connected, the middle bridge fixing bracket 16 is connected to the middle bridge 4, and the middle bridge motor three-phase wire group 2 has a three-phase wire harness margin 15 (referring to the slack section wire harness. Because the wire harness is long, the excess part after connection is concentrated here to form the three-phase wire harness margin 15) in front of the middle bridge fixing bracket 16; the motor controller 1 is connected to the rear axle front motor 6 and the rear axle rear motor 8 through the rear axle motor three-phase wire group 9, and a rear axle fixing bracket 17 is provided on the rear axle motor three-phase wire group 9. After passing through the rear axle fixing bracket 17, the rear axle motor three-phase wire group 9 is divided into two wire harnesses with different directions, namely the rear axle front motor three-phase wire 13 and the rear axle rear motor three-phase wire 14. The rear axle front motor three-phase wire 13 is connected to the rear axle front motor 6, and the rear axle rear motor three-phase wire 14 is connected to the rear axle rear motor 8. The rear axle fixing bracket 17 is connected to the rear axle 7, and the rear axle motor three-phase wire group 9 has a three-phase wire harness margin 15 in front of the rear axle fixing bracket 17. A first frame fixing bracket 18 is provided on the mid-bridge motor three-phase wire group 2, and the first frame fixing bracket 18 is located in front of the mid-bridge fixing bracket 16. The three-phase wire harness remainder 15 on the mid-bridge motor three-phase wire group 2 is located between the mid-bridge fixing bracket 16 and the first frame fixing bracket 18, and the first frame fixing bracket 18 is connected to the frame 10; a second frame fixing bracket 19 is provided on the rear axle motor three-phase wire group 9, and the second frame fixing bracket 19 is located in front of the rear axle fixing bracket 17. The three-phase wire harness remainder 15 on the rear axle motor three-phase wire group 9 is located between the rear axle fixing bracket 17 and the second frame fixing bracket 19, and the second frame fixing bracket 19 is connected to the frame 10, constraining the three-phase wire harness remainder 15 to the corresponding position; the mid-bridge front motor three-phase wire 11, the mid-bridge rear motor three-phase wire 12, the rear axle front motor three-phase wire 13 and the rear axle rear motor three-phase wire 14 are all provided with constraint brackets to constrain the three-phase wires to avoid being scattered.In this way, the wiring harness of the motor three-phase wire from the OT terminal 20 of the motor junction box to the fixed bracket on the bridge body vibrates up and down with the motor. When the car moves, the motor will vibrate up and down with the bridge body. The motor three-phase wire around the motor is fixed on the motor and has no relative movement with respect to the motor. In this way, the OT terminal 20 of the motor three-phase wire will not be pulled or water will enter.

[0023] Among them, because the motor three-phase line in the existing technology runs on the left and right sides of the beam, Figure 1 As shown, the space occupied by the vehicle's water lines and low-voltage wiring harness is quite limited, leading to interference between the water lines, low-voltage wiring harness, and high-voltage wiring harness. A further improvement is to arrange the three-phase wiring group 2 of the mid-axle motor in an upper-lower arrangement, with the three-phase wiring group 11 of the mid-axle front motor and the three-phase wiring group 12 of the mid-axle rear motor arranged in an upper-lower arrangement in front of the mid-axle fixing bracket 16; and to arrange the three-phase wiring group 9 of the rear-axle motor in an upper-lower arrangement, with the three-phase wiring group 13 of the rear-axle front motor and the three-phase wiring group 14 of the rear motor arranged in an upper-lower arrangement in front of the rear-axle fixing bracket 17. Furthermore, the vehicle frame 10 is equipped with water pipes and low-voltage wiring harnesses, located on the left side of the vehicle frame 10, while the three-phase wiring group of the mid-axle 4 and the three-phase wiring group of the rear-axle 7 are both arranged on the right side of the vehicle frame 10. This prevents the three-phase wiring group of the motor from occupying too much space and interfering with the water pipes and low-voltage wiring harness, thereby preventing the wiring harness from being pulled and water from entering the wiring harness terminals.

[0024] Additionally, the three-phase wiring harness margin 15 is an upwardly curved arc. Because the three-phase wiring harness margin 15 moves up and down during vehicle operation, sufficient margin is required to allow for this movement. Furthermore, the three-phase wiring harnesses at these two locations must closely track the motion of the center axle 4 and rear axle 7 to avoid significant pulling and throwing forces. Generally, the trajectory of the OT terminal 20 of the motor junction box is simulated accordingly, and the three-phase wiring harness margin 15 is determined based on the corresponding motor junction box trajectory.

[0025] In the present description, claims, and accompanying drawings, the terms "upper," "lower," "outer," "inner," and the like (if any) are used to distinguish relative positions, and are not necessarily qualitative. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0026] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A new energy electric drive axle tractor with a rationally arranged motor three-phase line, comprising a vehicle frame, on which a motor controller, a middle axle and a rear axle are sequentially mounted from front to rear, wherein a middle axle front motor is mounted at the front of the middle axle, a middle axle rear motor is mounted at the rear of the middle axle, a rear axle front motor is mounted at the front of the rear axle, and a rear axle rear motor is mounted at the rear of the rear axle, characterized in that: The motor controller is connected to the front motor and the rear motor of the middle bridge through the three-phase line group of the middle bridge motor. A middle bridge fixed bracket is provided on the three-phase line group of the middle bridge motor. After passing through the middle bridge fixed bracket, the three-phase line group of the middle bridge motor branches out into two wire harnesses with different directions behind the middle bridge fixed bracket, namely the three-phase line of the front motor of the middle bridge and the three-phase line of the rear motor of the middle bridge. The three-phase line of the front motor of the middle bridge is connected to the front motor of the middle bridge, and the three-phase line of the rear motor of the middle bridge is connected to the rear motor of the middle bridge. The middle bridge fixed bracket is connected to the middle bridge, and the three-phase line group of the middle bridge motor has a three-phase line harness margin in front of the middle bridge fixed bracket; the motor controller is connected to the front motor and the rear motor of the rear bridge through the three-phase line group of the rear axle motor. Rear axle fixing bracket, the rear axle motor three-phase wire group is divided into two wire harnesses with different directions after passing through the rear axle fixing bracket, namely the rear axle front motor three-phase wire and the rear axle rear motor three-phase wire. The rear axle front motor three-phase wire is connected to the rear axle front motor, and the rear axle rear motor three-phase wire is connected to the rear axle rear motor. The rear axle fixing bracket is connected to the rear axle, and the rear axle motor three-phase wire group has a three-phase wire harness surplus in front of the rear axle fixing bracket; the first frame fixing bracket and the second frame fixing bracket are connected to the frame, the three-phase wire harness surplus on the mid-axle motor three-phase wire group is located between the mid-axle fixing bracket and the first frame fixing bracket, and the three-phase wire harness surplus on the rear axle motor three-phase wire group is located between the rear axle fixing bracket and the second frame fixing bracket.

2. The new energy electric drive axle tractor with rationally arranged motor three-phase lines as claimed in claim 1 is characterized in that: A first vehicle frame fixing bracket is provided on the three-phase line group of the mid-bridge motor, and the first vehicle frame fixing bracket is located in front of the mid-bridge fixing bracket.

3. The new energy electric drive axle tractor with rationally arranged motor three-phase lines as claimed in claim 2 is characterized in that: A second frame fixing bracket is provided on the rear axle motor three-phase line group, and the second frame fixing bracket is located in front of the rear axle fixing bracket.

4. The new energy electric drive axle tractor with a rational arrangement of the motor three-phase lines as described in any one of claims 1-3, characterized in that: The three-phase line group of the mid-bridge motor is arranged in upper and lower layers.

5. The new energy electric drive axle tractor with rationally arranged motor three-phase lines as claimed in claim 4 is characterized in that: The three-phase line group of the rear axle motor is arranged in upper and lower layers.

6. The new energy electric drive axle tractor with rationally arranged motor three-phase lines as claimed in claim 5 is characterized in that: Water pipes and low-voltage wiring harnesses are installed on the frame. The water pipes and low-voltage wiring harnesses are located on the left side of the frame, and the mid-bridge three-phase wire group and the rear axle three-phase wire group are both arranged on the right side of the frame.

7. The new energy electric drive axle tractor with rationally arranged motor three-phase lines as claimed in claim 3 is characterized in that: The remaining three-phase wire harness is in an upward curved shape.

8. The new energy electric drive axle tractor with a rational arrangement of the motor three-phase lines according to any one of claims 1-3, characterized in that: Constraint brackets are provided on the three-phase wires of the front motor of the bridge, the three-phase wires of the rear motor of the middle bridge, the three-phase wires of the front motor of the rear axle and the three-phase wires of the rear motor of the rear axle.

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