Axle housing of low-floor wheel-side distributed electric drive axle

Abstract

The utility model discloses a low floor wheel side distribution type electric drive axle housing which comprises an axle housing body, a wheel side speed reducer and a motor housing are arranged at the two ends of the axle housing body respectively, the axle housing body comprises an axle housing body, an axle housing box cover connected with the axle housing body is arranged at the top of the axle housing body, and a motor oil inlet and a speed reducer oil inlet are formed in the side walls of the two ends of the axle housing body respectively. An oil pump communicated with the axle housing body is arranged on the front wall of the axle housing body and connected with a left oil conveying pipe and a right oil conveying pipe. According to the axle housing, the oil tank and the lubricating system are integrated, oil in the left and right hub motors and the speed reducer directly flows into the oil tank of the axle housing body through gravity and then is pumped to the motor cooling oil system and the lubricating system of the speed reducer through the oil pump, the use requirement of a low-floor type public bus is met, and the service life of the low-floor type public bus is prolonged. And active lubrication of an oil cooling motor and a speed reducer is achieved on the low-floor wheel edge distributed electric drive axle, and the requirements for high integration efficiency, high torque density, low energy consumption and low cost of a new energy commercial vehicle are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of bus component structures, and in particular relates to a low-floor wheel-side electric drive axle housing. Background Art

[0002] A low-floor bus is a type of public bus with a floor height that is much lower than that of a conventional bus. The ground clearance of the steps at the front and rear doors is less than 350mm, allowing passengers to enter by taking one step. Since there are no steps on the floor, the speed at which passengers (especially disabled passengers with limited mobility) get on and off the bus is improved, the time it takes for vehicles to enter and exit stations is reduced, and the vehicle's operating efficiency is improved. At the same time, national ministries and commissions have also put forward clear and specific requirements for the completion time of the construction of a barrier-free travel service system for transportation. Therefore, the number of low-floor buses in large and medium-sized cities has increased year by year.

[0003] The rapid development of low-floor buses has driven the application of electric axle systems and the continuous advancement of their technology. As the core component of an electric axle system, the drive motor is the vehicle's power center, leading to increasing demands for performance and efficiency. Oil-cooled motors, with their advantages of high efficiency, low noise, and excellent heat dissipation, have become the mainstream application of electric axle systems, meeting the high integration efficiency, high torque density, and low energy consumption requirements of new energy commercial vehicles.

[0004] However, due to the limited ground clearance of low-floor buses, when using oil-cooled motors, especially when using actively lubricated reducers, there is nowhere to store the oil used for the motor cooling oil system and reducer lubrication. Utility Model Content

[0005] The technical problem to be solved by the present invention is that the cooling oil system of the oil-cooled motor and the lubrication of the reducer cannot be recycled. In order to solve the above problem, a low-floor wheel-side distributed electric drive axle housing is provided, which can realize the recycling of the lubricating oil of the oil-cooled motor and the reducer on the low-floor wheel side.

[0006] The purpose of this utility model is achieved in the following ways:

[0007] A low-floor wheel-side distributed electric drive bridge housing, including a bridge housing, wheel-side reducers and motor housings are respectively provided at both ends of the bridge housing, the bridge housing includes a bridge housing body, a bridge housing box cover connected to the bridge housing body is provided on the top of the bridge housing body, the cavity surrounded by the bridge housing body and the bridge housing box cover constitutes an oil tank, a left motor oil inlet and a left reducer oil inlet are provided on the left end wall of the bridge housing body, a right motor oil inlet and a right reducer oil inlet are provided on the right end wall of the bridge housing body, the left motor oil inlet is connected to the left motor oil inlet pipe connected to the oil outlet of the left motor cooling and lubrication system, and the left reducer oil inlet is connected to the left reducer lubrication system. The left reducer oil inlet pipe is connected to the oil system outlet, and the corresponding right motor oil inlet is connected to the right motor oil inlet pipe connected to the oil outlet of the right motor cooling and lubrication system. The right reducer oil inlet is connected to the right reducer oil inlet pipe connected to the right reducer lubricating oil system outlet. An oil pump connected to the bridge housing body is provided on the front wall of the bridge housing body, and the oil pump is connected to a left oil pipe and a right oil pipe. The left oil pipe is respectively connected to the oil inlet of the left motor lubrication system and the oil inlet of the left reducer lubrication system, and the right oil pipe is respectively connected to the oil inlet of the right motor lubrication system and the oil inlet of the right reducer lubrication system.

[0008] The above-mentioned low-floor wheel-side distributed electric drive axle housing, the top of the axle housing body is connected to the axle housing box cover by bolts.

[0009] The above-mentioned low-floor wheel-side distributed electric drive axle bridge housing has an oil outlet and an oil passage chamber on the front wall of the bridge housing body. The oil passage chamber is connected to the oil outlet, an oil pump is provided on the oil passage chamber, and a left oil pipe and a right oil pipe are distributed on both sides of the oil passage chamber.

[0010] The above-mentioned low-floor wheel-side distributed electric drive axle bridge housing has reinforcing ribs arranged in the bridge housing body, and surge prevention holes are arranged at the bottom of the reinforcing ribs to connect the cavities on both sides of the reinforcing ribs.

[0011] The above-mentioned low-floor wheel-side distributed electric drive axle bridge housing has two reinforcing ribs arranged in the bridge housing body, and an anti-surge hole connecting the cavities on both sides of the reinforcing rib is arranged at the bottom of each reinforcing rib.

[0012] The above-mentioned low-floor wheel-side distributed electric drive axle bridge housing, the bridge housing, the wheel-side reducer and motor housing at the left end of the bridge housing, and the reducer and motor housing at the right end of the bridge housing are an integrated structure.

[0013] Compared with the prior art, the present invention has the following technical effects:

[0014] The axle housing of this utility model integrates the oil tank and lubrication system into one. The space of the axle housing body is equipped with the axle housing box cover above the axle housing to form a cavity for oil storage. This eliminates the need to use a pump to pump the lubricating oil into the oil tank at a high position. Instead, gravity is used to directly flow the oil in the left and right wheel-side motors and reducers into the axle housing body. The oil pump integrated in the axle housing body is then pumped into the motor for cooling the motor, and synchronously pumped into the reducer for lubrication. This not only meets the use requirements of low-floor buses, but also realizes oil-cooled motors and active lubrication of reducers on low-floor wheel-side distributed electric drive axles, meeting the requirements of high integration efficiency, high torque density, low energy consumption, and low cost for new energy commercial vehicles. Two reinforcing ribs are also designed in the cavity, and anti-surge holes are opened at the bottom of the reinforcing ribs. While ensuring the structural strength of the axle housing, it can also prevent the left and right oil surges in the oil tank during vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of opening the axle housing box cover of the utility model. DETAILED DESCRIPTION

[0017] Example 1:

[0018] As attached Figure 1 and Figure 2As shown, the utility model discloses a low-floor wheel-side distributed electric drive bridge housing, including a bridge housing, with wheel-side reducers and motor housings respectively arranged at both ends of the bridge housing, the bridge housing including a bridge housing body 4, a bridge housing box cover 13 connected to the bridge housing body is arranged on the top of the bridge housing body, the cavity surrounded by the bridge housing body and the bridge housing box cover constitutes an oil tank, a left motor oil inlet 3 and a left reducer oil inlet 2 are arranged on the left end wall of the bridge housing body, a right motor oil inlet 10 and a right reducer oil inlet 11 are arranged on the right end wall of the bridge housing body, the left motor oil inlet is connected to the left motor oil inlet pipe connected to the oil outlet of the left motor cooling and lubrication system, and the left reducer oil inlet is connected to the left motor oil inlet pipe. The left reducer oil inlet pipe is connected to the oil outlet of the left reducer lubricating oil system. The corresponding right motor oil inlet is connected to the right motor oil inlet pipe connected to the oil outlet of the right motor cooling and lubrication system. The right reducer oil inlet is connected to the right reducer oil inlet pipe connected to the oil outlet of the right reducer lubricating oil system. An oil pump 8 is installed on the front wall of the axle housing body, connected to the axle housing body. The oil pump is connected to the left oil delivery pipe 5 and the right oil delivery pipe 9. The left oil delivery pipe connects the oil inlet of the left motor lubrication system and the oil inlet of the left reducer lubrication system, respectively. The right oil delivery pipe connects the oil inlet of the right motor lubrication system and the oil inlet of the right reducer lubrication system, respectively. A thrust rod support 6 is installed at the rear of the axle housing body. The axle housing of this utility model integrates the oil tank and lubrication system into one. The axle housing body space is equipped with an axle housing cover above the axle housing to form a cavity for oil storage. This eliminates the need to use a pump to pump lubricating oil into the high-rise oil tank. Instead, gravity directly draws the oil from the left and right wheel-side motors and reducers into the axle housing body. The oil pump integrated into the axle housing body then pumps it to the motors for cooling and synchronously pumps it to the reducers for lubrication. This not only meets the needs of low-floor buses, but also implements oil-cooled motors and active lubrication of reducers on low-floor wheel-side distributed electric drive axles, meeting the requirements of high integration efficiency, high torque density, low energy consumption, and low cost for new energy commercial vehicles.

[0019] The low-floor wheel-side distributed electric drive axle housing of the present invention has a preferred structure in which the top of the axle housing body is connected to the axle housing box cover by bolts.

[0020] The low-floor, wheel-side distributed electric drive axle housing of this utility model preferably comprises an integrated structure comprising the axle housing, the wheel-side reducer and motor housing at the left end of the axle housing, and the reducer and motor housing at the right end of the axle housing. This integration of the three components meets the requirements of automotive parts and integrated production, facilitating parts management and transportation.

[0021] The low-floor wheel-side distributed electric drive axle housing described in the present invention has a preferred structure in which an oil outlet and an oil passage chamber 7 are provided on the front wall of the axle housing body, the oil passage chamber is connected to the oil outlet, an oil pump 8 is provided on the oil passage chamber, and a left oil pipe 5 and a right oil pipe 9 are distributed on both sides of the oil passage chamber.

[0022] The low-floor wheel-side distributed electric drive axle housing of the present invention has a preferred structure in which reinforcing ribs 14 are provided in the axle housing body, and surge prevention holes 15 are provided at the bottom of the reinforcing ribs to connect the cavities on both sides of the reinforcing ribs.

[0023] The optimal structure of the low-floor wheel-side distributed electric drive bridge housing described in the present invention is that two reinforcing ribs 14 are arranged in the bridge housing body, and an anti-surge hole 15 is provided at the bottom of each reinforcing rib to connect the cavities on both sides of the reinforcing rib. While ensuring the structural strength of the bridge housing, it can also prevent the left and right oil surges in the fuel tank during vehicle driving.

[0024] The working process of this utility model is as follows:

[0025] The left-end reducer and motor are installed within the left-end reducer and motor housing. The oil outlet of the left-end reducer's lubricating oil system is connected to the left reducer oil inlet pipe of the utility model, the oil outlet of the left motor's cooling oil system is connected to the left motor's oil inlet pipe, and the oil inlet of the left reducer's lubricating system is connected to the left oil pipeline. Correspondingly, the oil outlet of the right-end reducer's lubricating oil system is connected to the right reducer's oil inlet pipe of the utility model, the oil outlet of the right motor's cooling oil system is connected to the right motor's oil inlet pipe, and the oil inlet of the right reducer's lubricating system is connected to the right oil pipeline. In this way, gravity is directly used to direct the oil from the left and right wheel-side motors and reducers into the oil tank of the axle housing body. The oil is then pumped into the motor for cooling and synchronously pumped into the reducer for lubrication, thereby meeting the use requirements of low-floor buses. Furthermore, the oil-cooled motor and active lubrication of the reducer are realized on the low-floor wheel-side distributed electric drive axle, meeting the requirements of high integration efficiency, high torque density, low energy consumption, and low cost for new energy commercial vehicles. Two reinforcing ribs are also designed in the fuel tank, and surge prevention holes are set at the bottom of the reinforcing ribs. While ensuring the structural strength of the bridge housing, it can also prevent left and right oil surges during vehicle driving.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A low-floor wheel-side distributed electric drive axle housing, comprising a bridge housing, with a wheel-side reducer and a motor housing respectively provided at both ends of the bridge housing, characterized in that: The axle housing includes an axle housing body, a bridge housing box cover connected to the axle housing body is provided on the top of the axle housing body, and the cavity surrounded by the axle housing body and the bridge housing box cover constitutes an oil tank. The left end wall of the axle housing body is provided with a left motor oil inlet and a left reducer oil inlet, and the right end wall of the axle housing body is provided with a right motor oil inlet and a right reducer oil inlet. The left motor oil inlet is connected to the left motor oil inlet pipe connected to the oil outlet of the left motor cooling and lubrication system, and the left reducer oil inlet is connected to the left reducer oil inlet pipe connected to the oil outlet of the left reducer lubricating oil system. The oil inlet of the right motor is connected to the right motor oil inlet pipe which is connected to the oil outlet of the right motor cooling and lubrication system. The oil inlet of the right reducer is connected to the right reducer oil inlet pipe which is connected to the oil outlet of the right reducer lubricating oil system. An oil pump which is connected to the bridge housing body is provided on the front wall of the bridge housing body. The oil pump is connected to a left oil pipe and a right oil pipe. The left oil pipe is respectively connected to the oil inlet of the left end motor lubrication system and the oil inlet of the left end reducer lubrication system. The right oil pipe is respectively connected to the oil inlet of the right end motor lubrication system and the oil inlet of the right end reducer lubrication system.

2. The low-floor wheel-side distributed electric drive axle housing according to claim 1 is characterized by: The top of the axle housing body is connected to the axle housing box cover by bolts.

3. The low-floor wheel-side distributed electric drive axle housing according to claim 1 is characterized by: An oil outlet hole and an oil passage chamber are provided on the front wall of the bridge housing body. The oil passage chamber is connected to the oil outlet hole. An oil pump is provided on the oil passage chamber. A left oil pipeline and a right oil pipeline are distributed on both sides of the oil passage chamber.

4. The low-floor wheel-side distributed electric drive axle housing according to claim 1 is characterized by: The bridge shell body is provided with reinforcing ribs, and the bottom of the reinforcing ribs is provided with surge-proof holes communicating with the chambers on both sides of the reinforcing ribs.

5. The low-floor wheel-side distributed electric drive axle housing according to claim 4 is characterized by: Two reinforcing ribs are arranged in the bridge shell body, and an anti-surge hole is arranged at the bottom of each reinforcing rib to communicate with the chambers on both sides of the reinforcing rib.

6. The low-floor wheel-side distributed electric drive axle housing according to claim 1 is characterized by: The axle housing, the wheel-side reducer and the motor housing at the left end of the axle housing, and the reducer and the motor housing at the right end of the axle housing are an integrated structure.

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