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

Abstract

The invention discloses a low-floor wheel edge distributed electric drive axle housing which comprises an axle housing body, a wheel edge speed reducer and a motor shell 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 wheel side motors and the speed reducer flows into the oil tank of the axle housing body directly 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 invention 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 bus with a much lower floor height than a normal bus, and the ground clearance of the steps at the front and rear doors is less than 350mm, so passengers can enter with one step. Since there are no steps on the floor, the speed of getting on and off the bus is improved, especially for disabled passengers with limited mobility, the time it takes for vehicles to enter and exit stations is reduced, and the vehicle operating efficiency is improved. At the same time, national ministries and commissions have also put forward clear specific requirements for the completion time of the construction of a barrier-free travel service system for transportation, so 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 promoted the application of electric drive axle systems and the continuous improvement of technology. As the core component of the electric drive axle system, the drive motor is the power center of the vehicle, so the requirements for its performance and efficiency are gradually increasing. Oil-cooled motors have the advantages of high efficiency, low noise, and good heat dissipation performance. They meet the requirements of high integration efficiency, high torque density, and low energy consumption of new energy commercial vehicles, and have become the mainstream application of electric drive axle systems.

[0004] However, due to the limited ground clearance of low-floor buses, when using oil-cooled motors, especially when using actively lubricated reducers at the same time, there is nowhere to put the oil used for the motor cooling oil system and the reducer lubrication. Summary of the invention

[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 object of the present invention is achieved in the following manner: A low-floor wheel-side distributed electric drive bridge housing comprises a bridge housing, wheel-side reducers and motor housings are respectively arranged at both ends of the bridge housing, the bridge housing comprises a bridge housing body, a bridge housing box cover 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 and a left reducer oil inlet are arranged on the left end wall of the bridge housing body, a right motor oil inlet and a right reducer oil inlet 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 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 arranged 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.

[0007] 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.

[0008] 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 with the oil outlet, an oil pump is arranged on the oil passage chamber, and a left oil pipeline and a right oil pipeline are distributed on both sides of the oil passage chamber.

[0009] The above-mentioned low-floor wheel-side distributed electric drive bridge axle housing has reinforcing ribs arranged in the axle housing body, and surge prevention holes connecting the chambers on both sides of the reinforcing ribs are arranged at the bottom of the reinforcing ribs.

[0010] The above-mentioned low-floor wheel-side distributed electric drive bridge axle housing has two reinforcing ribs arranged in the axle housing body, and a surge prevention hole connecting the chambers on both sides of the reinforcing rib is arranged at the bottom of each reinforcing rib.

[0011] 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.

[0012] Compared with the prior art, the present invention has the following technical effects: The bridge housing of the present invention integrates the oil tank and the lubrication system into one. The bridge housing body space is equipped with the bridge housing box cover above the bridge housing to form a cavity for oil storage, so that there is no need to use a pump to pump the lubricating oil into the oil tank at a high place. The oil in the left and right wheel-side motors and reducers can be directly flowed into the bridge housing body by gravity, and then pumped into the motor for cooling the motor through the oil pump integrated in the bridge housing body, and synchronously pumped into the reducer for lubrication. It 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 bridges, meeting the requirements of high integration efficiency, high torque density, low energy consumption and low cost for new energy commercial vehicles. In addition, two reinforcing ribs are designed in the cavity, and surge-proof holes are opened at the bottom of the reinforcing ribs to ensure the structural strength of the bridge housing while preventing left and right oil surges in the tank during vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] Figure 2 It is a schematic diagram of opening the bridge housing box cover of the present invention. DETAILED DESCRIPTION

[0015] Embodiment 1: As attached Figure 1 and Figure 2As shown, the present invention discloses a low-floor wheel-side distributed electric drive bridge housing, including a bridge housing, wheel-side reducers and motor housings are respectively arranged at both ends of the bridge housing, the bridge housing includes 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, and 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, 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 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 connected to the axle housing body is arranged on the front wall of the axle housing body, and the oil pump is connected to the left oil delivery pipe 5 and the right oil delivery pipe 9. The left oil delivery pipe is connected to the oil inlet of the left end motor lubrication system and the oil inlet of the left end reducer lubrication system respectively, and the right oil delivery pipe is connected to the oil inlet of the right end motor lubrication system and the oil inlet of the right end reducer lubrication system respectively. A thrust rod support 6 is arranged at the rear of the axle housing body. The bridge housing of the present invention integrates the oil tank and the lubrication system into one. The bridge housing body space is equipped with the bridge housing box cover above the bridge housing to form a cavity for oil storage, so that there is no need to use a pump to pump the lubricating oil into the oil tank at a high place. The oil in the left and right wheel-side motors and the reducer can be directly flowed into the bridge housing body by gravity, and then pumped into the motor for cooling the motor through the oil pump integrated in the bridge housing body, and synchronously pumped into the reducer for lubrication. It 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 bridges, meeting the requirements of high integration efficiency, high torque density, low energy consumption and low cost for new energy commercial vehicles.

[0016] 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.

[0017] The low-floor wheel-side distributed electric drive axle housing of the present invention preferably has a structure in which 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 are an integrated structure. The three components are integrated into one piece, meeting the requirements of automobile parts and integrated production, and facilitating the management and transportation of parts.

[0018] 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 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.

[0019] The low-floor wheel-side distributed electric drive axle housing of the present invention has a preferred structure in which reinforcing ribs 14 are arranged in the axle housing body, and surge prevention holes 15 are arranged at the bottom of the reinforcing ribs to connect the chambers on both sides of the reinforcing ribs.

[0020] 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 connecting the chambers on both sides of the reinforcing rib is arranged at the bottom of each 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 the driving of the vehicle.

[0021] The working process of the present invention is as follows: The left-end reducer and motor are installed in the left-end reducer and motor housing, the oil outlet of the left-end reducer lubricating oil system is connected to the left reducer oil inlet pipe of the present invention, the oil outlet of the left motor cooling oil system is connected to the left motor oil inlet pipe, and the oil inlet of the left reducer lubricating system is connected to the left oil pipeline. Correspondingly, the oil outlet of the right-end reducer lubricating oil system is connected to the right reducer oil inlet pipe of the present invention, the oil outlet of the right motor cooling oil system is connected to the right motor oil inlet pipe, and the oil inlet of the right-end reducer lubricating system is connected to the right oil pipeline. In this way, gravity is directly used to flow the oil in the left and right wheel-side motors and reducers into the oil tank of the bridge housing body, and then the oil pump integrated on the bridge housing body is pumped into the motor for cooling the motor, and synchronously pumped into the reducer for lubrication, which not only meets the use requirements of low-floor buses, but also realizes oil-cooled motors on low-floor wheel-side distributed electric drive bridges, and active lubrication of reducers, 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 shell, it can also prevent left and right oil surges during vehicle driving.

[0022] 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, which 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 arranged at both ends of the bridge housing, characterized in that: The axle housing comprises an axle housing body, a axle housing box cover connected to the axle housing body is arranged on the top of the axle housing body, the cavity surrounded by the axle housing body and the axle housing box cover constitutes an oil tank, a left motor oil inlet and a left reducer oil inlet are arranged on the left end wall of the axle housing body, a right motor oil inlet and a right reducer oil inlet are arranged on the right end wall of the axle 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, 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, and the corresponding 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 arranged 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 with 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 arranged on the front wall of the bridge housing body. The oil passage chamber is connected with the oil outlet hole. An oil pump is arranged on the oil passage chamber. A left oil delivery pipe and a right oil delivery pipe 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 prevention holes which are connected 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 in that: Two reinforcing ribs are arranged in the bridge shell body, and a surge prevention hole connecting the chambers on both sides of the reinforcing rib is arranged at the bottom of each reinforcing rib.

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

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