A pure electric bus drive motor lower protection device

Abstract

The utility model aims at providing a pure electric bus drive motor lower protection device, low maintenance cost realizes the zoned protection, lightweight and heat dissipation synergic optimization, adapts the model demand of different ground clearance, can take away the heat of both sides of motor casing surface fast. The utility model discloses a vehicle frame, the vehicle frame is provided with motor, the motor is connected with transmission shaft transmission through output flange, the pure electric bus drive motor lower protection device still includes lower baffle and front baffle, the both ends of lower baffle are provided with front movable beam respectively, rear movable beam, the lower end of front baffle is connected with front movable beam, the upper end of front movable beam, the upper end of rear movable beam, the upper end of front baffle all are connected with vehicle frame, and the waist of front baffle is inclined setting. The utility model is applied to the technical field of pure electric bus chassis protection.

Description

Technical Field

[0001] This utility model applies to the technical field of chassis protection for pure electric buses, and particularly relates to a drive motor undercarriage protection device for pure electric buses. Background Technology

[0002] With the popularization of new energy technologies, pure electric buses are gradually replacing traditional fuel vehicles due to their advantages such as environmental protection and low noise. As the core power component, the drive motor is usually located under the chassis. However, due to the limitations of the overall vehicle layout and space, some models need to lower the motor installation position to below the lowest point of the chassis frame, which results in the motor housing, output shaft and its sealing structure being directly exposed to the risks of complex road conditions, and low ground clearance.

[0003] Traditional pure electric buses typically use a single flat panel structure for their motor underbody protection plates, such as aluminum alloy or stamped steel plates. These plates can only block small-sized flying sand and gravel, and have the following limitations: Insufficient protection: The overall thin plate structure has low strength and cannot withstand impacts from bottoming out or hard objects, which can easily lead to deformation of the motor housing, failure of the seal, or even water ingress. Conflict between heat dissipation and weight: The full-coverage underbody protection plate obstructs airflow under the chassis, reducing the motor's heat dissipation efficiency. On the other hand, increasing the thickness of the plate increases the weight, affecting the driving range.

[0004] Lack of targeted protection: Critical components such as the motor output shaft flange lack localized reinforcement protection, allowing mud and sand to enter and accelerate bearing wear, leading to seal failure. Traditional one-piece guards require thin plates to reduce weight due to their large coverage area, but their impact resistance is weak and cannot withstand impacts from bottoming out or hard objects; increasing the thickness significantly increases weight, violating lightweight design principles. The motor output shaft flange and sealing structure are located at the front end, and traditional guards do not specifically reinforce this area, allowing mud, water, and sand to easily enter, causing bearing corrosion and seal aging. Full-coverage guards obstruct airflow through the bottom of the motor, causing heat accumulation and abnormal temperature rise, affecting motor life and performance. One-piece guards are complex to install and remove; partial damage requires replacement of the entire guard, resulting in high maintenance costs; and they are difficult to adapt to the motor installation layout of different vehicle models.

[0005] For example, Chinese patent CN214688999U discloses a battery under-protection plate structure for electric vehicles. The overall structure is a flat plate, which has insufficient protection capabilities. The full-coverage under-protection plate obstructs airflow under the chassis, resulting in a decrease in the motor's heat dissipation efficiency. Therefore, it is necessary to provide a pure electric bus drive motor under-protection device with low maintenance costs, achieving zoned protection, lightweighting, and heat dissipation optimization, adapting to the needs of different vehicle models with different ground clearances, and being able to quickly remove heat from both sides of the motor housing surface. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a lower protection device for the drive motor of a pure electric bus. It has low maintenance cost, achieves zoned protection, lightweight and heat dissipation optimization, adapts to the needs of different vehicle models with different ground clearance, and can quickly remove heat from both sides of the motor housing surface.

[0007] The technical solution adopted by this utility model is as follows: This utility model includes a frame, the frame is equipped with a motor, the motor is connected to the transmission shaft through an output flange, the pure electric bus drive motor lower protection device also includes a lower baffle and a front baffle, the two ends of the lower baffle are respectively provided with a front movable beam and a rear movable beam, the lower end of the front baffle is connected to the front movable beam, the upper end of the front movable beam, the upper end of the rear movable beam and the upper end of the front baffle are all connected to the frame, and the waist of the front baffle is inclined.

[0008] As can be seen from the above solutions, for pure electric buses where the drive motor is installed below the lowest point of the chassis frame, the motor under-protection device with a hybrid structure of steel thin plate and movable beam has the characteristics of zoned protection, lightweight and heat dissipation optimization. The motor under-protection structure takes into account the requirements of high-strength protection, lightweight and heat dissipation. Especially for pure electric buses with low-mounted motors, the hybrid structure of split steel thin plate and movable beam achieves zoned protection, lightweight and heat dissipation optimization.

[0009] In a preferred embodiment, the front baffle is a thin steel plate structure with multiple folds, the lower end of the front baffle is connected to the front movable beam through the first mounting bolt hole, and the upper two ends of the front baffle are connected to the vehicle frame through the second mounting bolt hole.

[0010] In a preferred embodiment, the main bodies of the front movable beam and the rear movable beam are both spliced ​​and welded together using rectangular tubes. Both the front movable beam and the rear movable beam are connected to the vehicle frame. The main body has a trapezoidal structure. Connecting plates are welded to both ends of the front movable beam and both ends of the rear movable beam. The connecting plates have a U-shaped structure and two first bolt holes. The first bolt holes are installed on the corresponding connecting structures of the vehicle frame using first fasteners.

[0011] A preferred embodiment is that the lower baffle is a multi-faceted thin steel plate structure, and the front and rear ends of the lower baffle are provided with second bolt holes, which are connected and installed between the front movable beam and the rear movable beam by second fasteners.

[0012] A preferred embodiment is that the lower baffle is a U-shaped thin steel plate structure, and the angle between the side plate and the bottom plate of the lower baffle is an obtuse angle.

[0013] In a preferred embodiment, the front baffle is installed below the connection between the drive shaft and the output flange, the front movable beam is installed at the front end of the motor, the lower baffle is installed directly below the motor, the rear movable beam is installed at the rear end of the motor, and the lower baffle covers the middle of the motor. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a first perspective structural diagram of the present invention and the motor described herein; Figure 3 This is a second perspective structural diagram of the present invention and the motor described herein; Figure 4 This is a simulation analysis diagram of the air velocity in the external flow field of this utility model. Detailed Implementation

[0015] like Figures 1 to 3 As shown, in this embodiment, the present invention includes a frame, on which a motor 1 is mounted. The motor 1 is connected to a transmission shaft 3 via an output flange 2. The lower protection device for the pure electric bus drive motor also includes a lower baffle 4 and a front baffle 5. A front movable beam 6 and a rear movable beam 7 are respectively mounted on both ends of the lower baffle 4. The lower end of the front baffle 5 is connected to the front movable beam 6. The upper ends of the front movable beam 6, the rear movable beam 7, and the front baffle 5 are all connected to the frame. The waist of the front baffle 5 is inclined.

[0016] The front movable beam 6, the rear movable beam 7, and the lower baffle 4 are all independently installed. Local damage only requires replacement of the corresponding module, reducing maintenance costs. The front movable beam 6 and the rear movable beam 7 are adjustable in height, adapting to different vehicle models with varying ground clearances by adjusting the bolt mounting positions. The front baffle 5 and the movable beams provide dual protection. The steel front baffle 5 prevents mud, water, and sand from splashing onto the motor 1 and the output flange 2, preventing seal failure. The front movable beam 6 is a detachable steel frame installed at the front end of the vehicle frame's longitudinal beams. Its lowest point is lower than the motor housing, prioritizing the absorption of forward bottoming impacts and preventing direct impact to the motor. The rear movable beam 7 provides reverse protection. Its structure is symmetrical to the front movable beam 6, buffering rear bottoming impacts during reversing and providing omnidirectional collision protection. The lower baffle 4 serves as a central U-shaped guide baffle, using a partially U-shaped thin steel plate to cover the middle of the motor 1 bead. The front and rear ends are fixed by overlapping movable beams. This non-full-coverage design reduces material usage and significantly lowers weight compared to traditional guard plates. The front movable beam 6 and rear movable beam 7 are both bolted to the frame, acting as local reinforcing ribs while providing protection, improving the frame's torsional strength and avoiding the need for additional reinforcement components.

[0017] like Figures 1 to 3 As shown, in this embodiment, the front baffle 5 is a multi-faceted thin steel plate structure. The lower end of the front baffle 5 is connected to the front movable beam 6 through the first mounting bolt hole, and the upper two ends of the front baffle 5 are connected to the vehicle frame through the second mounting bolt holes. The multi-faceted structure ensures the lateral structural strength of the front baffle 5, effectively preventing resonance problems during driving. It can directly block mud and water blowing from the ground onto the sealing cover of the motor's front output shaft, diverting airflow to the area below and above the motor 1, and quickly removing heat from the upper and lower parts of the motor 1's housing surface.

[0018] like Figures 1 to 3 As shown, in this embodiment, the main bodies of the front movable beam 6 and the rear movable beam 7 are both welded together using rectangular tubing. Both the front movable beam 6 and the rear movable beam 7 are connected to the vehicle frame. The main body has a trapezoidal structure. Connecting plates 8 are welded to both ends of the front movable beam 6 and the rear movable beam 7. The connecting plates 8 have a U-shaped structure and two first bolt holes. These first bolt holes are installed on the corresponding connecting structures of the vehicle frame using first fasteners. The main bodies of both the front movable beam 6 and the rear movable beam 7 can effectively resist vertical impacts from the bottom. The connecting plates 8 improve the movable beams' ability to resist impact forces in the front and rear directions, while also increasing the structural strength of the movable beams and the vehicle frame.

[0019] like Figures 1 to 3 As shown, in this embodiment, the lower baffle 4 is a multi-faceted thin steel plate structure. The front and rear ends of the lower baffle 4 are provided with second bolt holes, which are connected and installed between the front movable beam 6 and the rear movable beam 7 via second fasteners. The lower baffle 4 can guide the airflow below the motor 1 to both sides of the motor 1, quickly removing heat from both sides of the motor 1 housing surface.

[0020] like Figures 1 to 3 As shown, in this embodiment, the lower baffle 4 is a U-shaped thin steel plate structure, and the angle between the side plate and the bottom plate of the lower baffle 4 is an obtuse angle.

[0021] like Figures 1 to 3 As shown, in this embodiment, the front baffle 5 is installed below the connection between the drive shaft 3 and the output flange 2, the front movable beam 6 is installed at the front end of the motor 1, the lower baffle 4 is installed directly below the motor 1, the rear movable beam 7 is installed at the rear end of the motor 1, and the lower baffle 4 covers the middle of the motor 1.

[0022] like Figure 4As shown, in this embodiment, a flow guide gap is formed between the front baffle 5 and the lower baffle 4. During driving, the airflow accelerates along the edge of the baffle, quickly carrying away the heat from the top and bottom of the motor 1.

Claims

1. A drive motor underrun protection device for a pure electric bus, comprising a frame, wherein a motor (1) is mounted on the frame, and the motor (1) is connected to a drive shaft (3) via an output flange (2), characterized in that: The lower protection device for the drive motor of the pure electric bus also includes a lower baffle (4) and a front baffle (5). The two ends of the lower baffle (4) are respectively provided with a front movable beam (6) and a rear movable beam (7). The lower end of the front baffle (5) is connected to the front movable beam (6). The upper ends of the front movable beam (6), the upper ends of the rear movable beam (7), and the upper ends of the front baffle (5) are all connected to the vehicle frame. The waist of the front baffle (5) is inclined.

2. The undercarriage protection device for the drive motor of a pure electric bus according to claim 1, characterized in that: The front baffle (5) is a multi-faceted thin steel plate structure. The lower end of the front baffle (5) is connected to the front movable beam (6) through the first mounting bolt hole, and the upper two ends of the front baffle (5) are connected to the vehicle frame through the second mounting bolt hole.

3. The undercarriage protection device for the drive motor of a pure electric bus according to claim 1, characterized in that: The main body of the front movable beam (6) and the main body of the rear movable beam (7) are both spliced ​​and welded by rectangular tubes. The front movable beam (6) and the rear movable beam (7) are both connected to the frame. The main body is a trapezoidal structure. Both ends of the front movable beam (6) and both ends of the rear movable beam (7) are welded with connecting plates (8). The connecting plates (8) are U-shaped structures. The connecting plates (8) have two first bolt holes. The first bolt holes are installed on the corresponding connecting structure of the frame by first fasteners.

4. The undercarriage protection device for the drive motor of a pure electric bus according to claim 1, characterized in that: The lower baffle (4) is a multi-faceted thin steel plate structure. The front and rear ends of the lower baffle (4) are provided with second bolt holes. The second bolt holes are connected and installed between the front movable beam (6) and the rear movable beam (7) by a second fastener.

5. The undercarriage protection device for the drive motor of a pure electric bus according to claim 1, characterized in that: The lower baffle (4) is a U-shaped thin steel plate structure, and the angle between the side plate of the lower baffle (4) and the bottom plate of the lower baffle (4) is an obtuse angle.

6. The undercarriage protection device for the drive motor of a pure electric bus according to claim 1, characterized in that: The front baffle (5) is installed below the connection between the drive shaft (3) and the output flange (2), the front movable beam (6) is installed at the front end of the motor (1), the lower baffle (4) is installed directly below the motor (1), the rear movable beam (7) is installed at the rear end of the motor (1), and the lower baffle (4) covers the middle of the motor (1).

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