Axle frame of wheel-side electric drive axle, wheel-side electric drive axle and vehicle

Abstract

The invention relates to the technical field of axle assemblies, in particular to an axle frame of a wheel-side electric drive axle, the wheel-side electric drive axle and a vehicle. The bridge frame of the wheel-side electric drive bridge comprises a main shell, the two ends of the main shell are each provided with an installation base used for installing a wheel-side mechanism, an oil storage cavity is formed in an inner cavity of the main shell, the main shell is provided with an oil way connecting structure, and the oil way connecting structure is used for being connected with a circulating oil way used for supplying oil to the wheel-side mechanism in a circulating mode. The oil storage cavity is provided with a space used for being communicated with the oil outlet end and the oil return end of the circulating oil way. The oil bottom box is formed by utilizing the shell structure of the bridge, the oil storage cavity is formed by utilizing the size of the bridge while the normal bearing function of the bridge is ensured, the structure is compact, the space is saved, the influence on the ground clearance caused by arranging the oil bottom box at the bottom of the motor of the wheel side mechanism can be avoided, and the low floor of a vehicle can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of axle assemblies, and in particular to a bridge frame of a wheel-side electric drive axle, a wheel-side electric drive axle, and a vehicle. Background Art

[0002] For vehicles such as city buses and airport shuttles where a large number of passengers stand, achieving low-floor design is currently an important direction for the convenience of passengers getting on and off the bus and for the comfort of riding. Electric buses use distributed wheel-side electric drive bridges to achieve low-floor design. The basic structure of this wheel-side electric drive bridge can be found in the Chinese utility model patent with authorization announcement number CN203427602U, which discloses a wheel-side electric drive reduction low-floor axle. The axle includes a bridge housing and a wheel-side mechanism disposed at both ends of the bridge housing. The wheel-side mechanism includes a wheel-side motor and a reduction unit. The power of the wheel-side motor is output to a single wheel through the reduction unit. Among them, the bridge housing constitutes the bridge frame of the axle for forming the installation foundation of components such as the wheel-side motor and the reduction unit.

[0003] At present, wheel-side motors are generally water-cooled, which is relatively low in cost. However, water-cooled motors are large in size and have low power density and torque density. In the prior art, there are also wheel-side motors that use oil cooling. An oil pan is integrated at the bottom of the wheel-side motor. The oil pan forms an oil storage chamber. The oil in the oil storage chamber is sent to the inside of the motor through an oil pump, a filter element, and an oil cooler. After taking away the heat inside the motor, it flows back to the oil pan, thus forming a cycle. Since the oil pan is set at the bottom of the motor, the oil pan will occupy the space at the bottom of the motor, thereby affecting the ground clearance. If the height of the axle is raised to meet the ground clearance, it is not conducive to the low-floor design of the vehicle. Summary of the invention

[0004] The object of the present invention is to provide a bridge frame of a wheel-side electric drive bridge to solve the problem that the current wheel-side electric drive bridge has an oil pan at the bottom of the motor, which easily affects the ground clearance and is not conducive to achieving a low-floor vehicle; the object of the present invention is also to provide a wheel-side electric drive bridge and a vehicle to solve the above-mentioned problem.

[0005] The technical solution of the bridge frame of the wheel side electric drive bridge of the present invention is: A bridge frame of a wheel-side electric drive bridge includes a main shell, and mounting seats for mounting a wheel-side mechanism are respectively provided at both ends of the main shell. The inner cavity of the main shell forms an oil storage chamber, and the main shell is provided with an oil circuit connection structure. The oil circuit connection structure is used to connect a circulating oil circuit for circulating oil supply to the wheel-side mechanism, and the oil storage chamber has a space for communicating with the oil outlet end and the oil return end of the circulating oil circuit.

[0006] Beneficial effect: The present invention pioneers a bridge frame of a wheel-side electric drive bridge that integrates an oil pan box with a bridge frame. The bridge frame body of the wheel-side electric drive bridge is arranged as a shell, and wheel-side mechanism mounting seats are arranged at both ends of the shell. The inner cavity of the shell itself forms an oil storage cavity, that is, the shell structure of the bridge frame itself is used to form the oil pan. While ensuring the normal load-bearing function of the bridge frame, the oil storage cavity is formed by utilizing the size of the bridge frame itself. The structure is compact and space-saving. It can avoid the influence of the oil pan box on the ground clearance caused by arranging the motor bottom of the wheel-side mechanism, and is conducive to realizing the low-floor vehicle.

[0007] Furthermore, the main shell includes a bottom shell and a cover plate, the mounting seat is connected to the bottom shell, the bottom shell has an upward opening, and the cover plate is mounted at the upward opening of the bottom shell and surrounds an inner cavity of the main shell.

[0008] Furthermore, an oil baffle plate for preventing oil from shaking is provided in the inner cavity of the main shell, and an oil hole for communicating the spaces on both sides of the oil baffle plate is provided at the bottom of the oil baffle plate.

[0009] The technical solution of the wheel side electric drive axle of the present invention is: A wheel-side electric drive bridge comprises a bridge frame, a wheel-side mechanism arranged on the bridge frame, and a circulating oil circuit for circulating oil supply to the wheel-side mechanism. The bridge frame comprises a main shell, and mounting seats for mounting the wheel-side mechanism are respectively provided at both ends of the main shell. The inner cavity of the main shell forms an oil storage cavity. The main shell is provided with an oil circuit connecting structure. The oil circuit connecting structure is used to connect the circulating oil circuit for circulating oil supply to the wheel-side mechanism. The oil storage cavity has a space for communicating with the oil outlet end and the oil return end of the circulating oil circuit.

[0010] Beneficial effect: The present invention pioneers a wheel-side electric drive bridge that integrates an oil pan box with a bridge frame. The bridge frame body of the wheel-side electric drive bridge is arranged as a shell, and wheel-side mechanism mounting seats are arranged at both ends of the shell. The inner cavity of the shell itself forms an oil storage cavity, that is, the shell structure of the bridge frame itself is used to form the oil pan. While ensuring the normal load-bearing function of the bridge frame, the oil storage cavity is formed by utilizing the size of the bridge frame itself. The structure is compact and space-saving. It can avoid the influence of the oil pan box on the ground clearance caused by arranging the motor bottom of the wheel-side mechanism, which is conducive to realizing the low-floor vehicle.

[0011] Furthermore, the main shell includes a bottom shell and a cover plate, the mounting seat is connected to the bottom shell, the bottom shell has an upward opening, and the cover plate is mounted at the upward opening of the bottom shell and surrounds an inner cavity of the main shell.

[0012] Furthermore, an oil baffle plate for preventing oil from shaking is provided in the inner cavity of the main shell, and an oil hole for communicating the spaces on both sides of the oil baffle plate is provided at the bottom of the oil baffle plate.

[0013] Furthermore, the oil return end of the circulating oil circuit is located at the center of the horizontal cross-section of the inner cavity of the main housing of the bridge frame, so as to maintain the oil level in the main housing above the liquid level when the axle is tilted.

[0014] Furthermore, the return oil ends of the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge frame are connected through connecting pipes, and an oil port is provided on the connecting pipe to connect the return oil end with the inner cavity of the main shell. A valve ball is movably provided in the connecting pipe, and the valve ball has an anti-backflow state that moves downward to block the corresponding return oil end when the axle is tilted.

[0015] Furthermore, the oil stored in the inner cavity of the main housing is lubricating oil, and the lubricating oil sent into the motor of the wheel-side mechanism by the circulating oil circuit has a portion flowing through the movable parts of the motor.

[0016] Furthermore, the circulating oil circuit includes a reducer oil channel arranged on the reducer of the wheel-side mechanism and a motor oil channel arranged on the motor of the wheel-side mechanism. The lubricating oil entering the reducer through the reducer oil channel cools and lubricates the reducer, and the lubricating oil entering the motor through the motor oil channel cools and lubricates the motor.

[0017] Furthermore, the circulating oil circuit includes an oil pump and an oil cooler, and the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge frame share a set of oil pump and oil cooler.

[0018] The technical solution of the vehicle of the present invention is: A vehicle comprises a wheel-side electric drive axle, which comprises a bridge frame, a wheel-side mechanism arranged on the bridge frame, and a circulating oil circuit for circulating oil supply to the wheel-side mechanism. The bridge frame comprises a main shell, and mounting seats for mounting the wheel-side mechanism are respectively provided at both ends of the main shell. The inner cavity of the main shell forms an oil storage cavity, and the main shell is provided with an oil circuit connection structure. The oil circuit connection structure is used to connect the circulating oil circuit for circulating oil supply to the wheel-side mechanism, and the oil storage cavity has a space for communicating with the oil outlet end and the oil return end of the circulating oil circuit.

[0019] Beneficial effect: The present invention pioneers a wheel-side electric drive bridge that integrates an oil pan box with a bridge frame. The bridge frame body of the wheel-side electric drive bridge is arranged as a shell, and wheel-side mechanism mounting seats are arranged at both ends of the shell. The inner cavity of the shell itself forms an oil storage cavity, that is, the shell structure of the bridge frame itself is used to form the oil pan. While ensuring the normal load-bearing function of the bridge frame, the oil storage cavity is formed by utilizing the size of the bridge frame itself. The structure is compact and space-saving. It can avoid the influence of the oil pan box on the ground clearance caused by arranging the motor bottom of the wheel-side mechanism, which is conducive to realizing the low-floor vehicle.

[0020] Furthermore, the main shell includes a bottom shell and a cover plate, the mounting seat is connected to the bottom shell, the bottom shell has an upward opening, and the cover plate is mounted at the upward opening of the bottom shell and surrounds an inner cavity of the main shell.

[0021] Furthermore, an oil baffle plate for preventing oil from shaking is provided in the inner cavity of the main shell, and an oil hole for communicating the spaces on both sides of the oil baffle plate is provided at the bottom of the oil baffle plate.

[0022] Furthermore, the oil return end of the circulating oil circuit is located at the center of the horizontal cross-section of the inner cavity of the main housing of the bridge frame, so as to maintain the oil level in the main housing above the liquid level when the axle is tilted.

[0023] Furthermore, the return oil ends of the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge frame are connected through connecting pipes, and an oil port is provided on the connecting pipe to connect the return oil end with the inner cavity of the main shell. A valve ball is movably provided in the connecting pipe, and the valve ball has an anti-backflow state that moves downward to block the corresponding return oil end when the axle is tilted.

[0024] Furthermore, the oil stored in the inner cavity of the main housing is lubricating oil, and the lubricating oil sent into the motor of the wheel-side mechanism by the circulating oil circuit has a portion that flows through the movable parts of the motor.

[0025] Furthermore, the circulating oil circuit includes a reducer oil channel arranged on the reducer of the wheel-side mechanism and a motor oil channel arranged on the motor of the wheel-side mechanism. The lubricating oil entering the reducer through the reducer oil channel cools and lubricates the reducer, and the lubricating oil entering the motor through the motor oil channel cools and lubricates the motor.

[0026] Furthermore, the circulating oil circuit includes an oil pump and an oil cooler, and the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge frame share a set of oil pump and oil cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of embodiment 1 of the wheel-side electric drive axle of the present invention; Figure 2 for Figure 1 Schematic diagram of the wheel side electric drive bridge without the cover; Figure 3 A simplified schematic diagram showing oil in Embodiment 1 of the wheel-side electric drive axle of the present invention; Figure 4 It is a simplified schematic diagram of the embodiment 1 of the wheel-side electric drive axle of the present invention when tilted; Figure 5 A simplified schematic diagram showing oil in Embodiment 2 of the wheel-side electric drive axle of the present invention; Figure 6 It is a simplified schematic diagram of the embodiment 2 of the wheel-side electric drive axle of the present invention when tilted; Figure 7 for Figure 5 Installation diagram of the connecting pipe and valve ball.

[0028] In the figure: 1. bridge frame; 11. bottom shell; 12. cover plate; 13. connecting arm; 14. main seat body; 15. oil baffle plate; 2. wheel side mechanism; 21. wheel side motor; 211. rotor; 212. stator; 22. wheel side reducer; 31. coarse filter element; 32. oil pump; 33. oil cooler; 34. fine filter element; 35. oil outlet pipe; 36. motor oil return pipe; 37. motor oil return end; 41. oil in oil storage chamber; 42. oil at the bottom of motor; 5. wheel; 61. connecting pipe; 62. valve ball. DETAILED DESCRIPTION

[0029] The present invention integrates the oil pan on the bridge frame and utilizes the shell structure of the bridge frame itself to form the oil pan, which has a compact structure and saves space. It can avoid the influence of setting the oil pan at the bottom of the motor of the wheel side mechanism on the ground clearance, which is conducive to realizing the low floor of the vehicle.

[0030] Embodiment 1 of the wheel-side electric drive axle of the present invention: like Figure 1 , Figure 2 As shown, the wheel-side electric drive bridge includes a bridge frame 1, a wheel-side mechanism 2 arranged on the bridge frame 1, and a circulating oil circuit for circulating oil supply to the wheel-side mechanism 2. The bridge frame 1 includes a main housing, and mounting seats for mounting the wheel-side mechanism 2 are respectively provided at both ends of the main housing. The inner cavity of the main housing forms an oil storage cavity, and the main housing is provided with an oil circuit connection structure, and the oil circuit connection structure is used to connect the circulating oil circuit for circulating oil supply to the wheel-side mechanism 2. The oil storage cavity has a space for connecting with the oil outlet and the oil return end of the circulating oil circuit. The inner cavity of the main housing of the bridge frame 1 itself is used to form the oil storage cavity, that is, the shell structure of the bridge frame 1 itself is used to form the oil pan. While ensuring the normal load-bearing function of the bridge frame 1, the size of the bridge frame 1 itself is used to form the oil storage cavity. The structure is compact and space-saving. The influence on the ground clearance caused by setting the oil pan at the bottom of the motor of the wheel-side mechanism 2 can be avoided, which is conducive to realizing the low floor of the vehicle.

[0031] The main shell of the bridge frame 1 includes a bottom shell 11 and a cover plate 12. The bottom shell 11 has an upward opening. The cover plate 12 is installed at the upward opening of the bottom shell 11 and surrounds the inner cavity of the main shell. The cover plate 12 is generally a flat plate structure. The bottom shell 11 is generally square, with left and right side walls, front and rear side walls and a bottom wall. The lower ends of the left and right side walls and the front and rear side walls are connected to the bottom wall, and the upper ends surround the upward opening of the bottom shell 11. The upper end surface of the bottom shell 11 is provided with fixing holes for the cover plate 12 to be fixed by bolts. The use of the bottom shell 11 and the cover plate 12, which are divided into upper and lower parts, is conducive to ensuring the structural strength of the side wall of the bottom shell 11, and is convenient for installing parts on the side wall of the bottom shell 11 without occupying space in the upper and lower directions. In other embodiments, if space permits, a horizontal side opening facing outward can be opened on the side wall of the main shell, and a cover plate can be set at the side opening.

[0032] The mounting base of the bridge frame 1 includes a main seat body 14 and a connecting arm 13. The left and right side walls of the bottom shell 11 are respectively connected to two connecting arms 13 spaced apart from each other. One end of the connecting arm 13 is connected to the bottom shell 11, and the other end is connected to the main seat body 14. The bottom shell 11, the connecting arm 13, and the main seat body 14 are an integrally formed structure. The wheel side mechanism 2 is installed on the main seat body 14. The two ends of the bridge frame 1 of the wheel side electric drive bridge are respectively provided with wheel side mechanisms 2. The two wheel side mechanisms 2 of the wheel side electric drive bridge are respectively installed on the main seat bodies 14 at the two ends of the bridge frame 1. The space between the two connecting arms 13 on the same side can avoid the motor of the wheel side mechanism 2 to facilitate the arrangement of the motor. The structure is compact and space-saving. The main shell of the bridge frame 1 is located between the main seats 14 on the left and right sides. The height of the main shell of the bridge frame 1 is lower than the height of the main seat body 14 to adapt to the layout of low-floor vehicles.

[0033] An oil baffle plate 15 for preventing oil from shaking is provided in the inner cavity of the main shell of the bridge frame 1 to prevent the oil in the oil storage cavity from shaking violently and forming surges during the driving of the vehicle. The oil baffle plate 15 is vertically arranged and two are arranged on the left and right. The front and rear ends of the oil baffle plate 15 are respectively connected to the front and rear side walls of the bottom shell 11, and the bottom of the oil baffle plate 15 is connected to the bottom wall of the bottom shell 11. The oil baffle plate 15 and the bottom shell 11 are an integral structure. The bottom of the oil baffle plate 15 is provided with an oil hole that connects the spaces on both sides thereof for the oil to pass through. In other embodiments, no oil baffle plate may be provided or only one oil baffle plate may be provided.

[0034] The oil stored in the inner cavity of the main shell of the bridge frame 1 is lubricating oil. The wheel-side mechanism 2 includes a motor and a reducer. The circulating oil circuit for circulating oil supply to the wheel-side mechanism 2 can send part of the lubricating oil into the motor of the wheel-side mechanism 2. Part of the lubricating oil flowing into the motor flows through the active parts of the motor, which can cool and dissipate the heat of the motor while playing a lubricating role. The bearings of the motor are oil-lubricated. In other embodiments, the lubricating oil can also be made to flow through the oil channel inside the side wall of the motor housing to take away the heat of the motor. At this time, cooling oil without lubrication can be used, and the bearings of the motor are lubricated with conventional grease.

[0035] The circulating oil circuit includes an oil pump 32 and an oil cooler 33 as well as a coarse filter element 31 and a fine filter element 34, and also includes an oil outlet pipe 35 and a motor oil return pipe 36. The coarse filter element 31 is installed inside the bottom shell 11, and the oil pump 32, the oil cooler 33 and the fine filter element 34 are installed on one of the side walls of the front and rear sides of the bottom shell 11. The oil cooler 33 is a mature technology and is used to cool the lubricating oil flowing through. The coarse filter element 31, the oil pump 32, the oil cooler 33 and the fine filter element 34 are connected in sequence. The two wheel side mechanisms 2 are respectively equipped with their own corresponding oil outlet pipes 35 and motor oil return pipes 36. One end of the oil outlet pipe 35 is connected to the fine filter element 34, and the other end is connected to the motor housing. After the lubricating oil passes through the motor, it flows back to the oil storage chamber through the motor oil return pipe 36 connected to the bottom of the motor. The circulating oil circuits corresponding to the wheel side mechanisms 2 at both ends of the bridge frame 1 share a set of oil pumps 32 and oil coolers 33, and also share a set of coarse filter elements 31 and fine filter elements 34, saving costs and layout space. In other embodiments, circulating oil circuits can also be separately set for the wheel side mechanisms on both sides. Of course, correspondingly, the internal space of the bottom shell can also be divided to form two oil storage chambers.

[0036] The circulating oil circuit also includes a reducer oil passage arranged at the top of the reducer housing and a motor oil passage arranged at the top of the motor housing. The oil outlet pipe 35 is connected to the motor oil passage, and the inlet portion of the motor oil passage is connected to the reducer oil passage. After the lubricating oil in the oil outlet pipe 35 enters the motor oil passage, a part of it enters the motor cavity along the motor oil passage, and a part of it enters the reducer oil passage and enters the reducer cavity along the reducer oil passage. The lubricating oil entering the reducer through the reducer oil passage cools and lubricates the reducer, and the lubricating oil entering the motor through the motor oil passage cools and lubricates the motor. A reducer oil return pipe is connected to the bottom of the reducer housing, and the motor oil return pipe 36 is connected to the bottom of the motor housing. The reducer oil return pipe is not shown in the figure. The motor oil return pipe 36 and the reducer oil return pipe both extend into the oil storage cavity. The motor oil return pipe 36 and the reducer oil return pipe of the two circulating oil circuits both extend into the oil storage cavity and extend to the space between the two oil baffles 15 in the oil storage cavity. The motor and reducer are connected through the same set of lubricating oil circulation oil circuits to achieve active lubrication and cooling, saving costs, and making the reducer oil return pipe and the motor oil return pipe 36 independent of each other, which is beneficial to prevent the dirty oil in the reducer from flowing back into the motor when the machine is shut down. In other embodiments, the lubricating oil may not enter the reducer, and only the motor is lubricated and cooled, and the reducer still adopts the conventional splash lubrication form.

[0037] The motor oil return pipe 36 and the reducer oil return pipe both pass through the side walls of the bottom shell 11 in the left-right direction and the corresponding oil baffle 15. The motor oil return pipe 36 and the reducer oil return pipe on the same side that pass through the bottom shell 11 extend in the left-right direction and are arranged in parallel front and back. The oil circuit connection structure of the main shell includes a mounting structure for mounting a coarse filter element 31 and an oil pump 32 on the side wall of the bottom shell 11 and a mounting structure for sealing and mounting the oil return pipe on the oil baffle 15 and the side wall of the bottom shell 11. The wheel side mechanisms 2 on both sides are arranged symmetrically on the left and right, and accordingly, the motor oil return pipes 36 and the reducer oil return pipes on the left and right sides are also arranged symmetrically on the left and right sides, and the coarse filter element 31 is arranged at a position between the motor oil return pipes 36 on the corresponding sides in the left-right direction.

[0038] The motor oil return pipe 36 and the reducer oil return pipe have one end located in the oil storage chamber, which constitutes the oil return end. The oil return end of the circulating oil circuit is located at the center of the horizontal section of the inner cavity of the main shell of the bridge frame 1. The motor oil return pipe 36 has the motor oil return end 37, and the reducer oil return pipe has the reducer oil return end. The motor oil return end 37 and the reducer oil return end on the same side are flush and located at the center of the horizontal section of the inner cavity of the bottom shell 11. The oil return end is located in the central area, that is, in the middle in the front-to-back direction and in the middle in the left-to-right direction. The front-to-back direction is the vehicle length direction, the left-to-right direction is the vehicle width direction, and the up-down direction is the vehicle height direction. The motor oil return pipe 36 and the reducer oil return pipe are also passed through the middle of the bottom shell 11 in the up-down direction. The motor oil return end 37 and the reducer oil return end are both located above the liquid level of the oil in the oil storage chamber. Combined with Figure 3 , Figure 4 When the vehicle is running normally on a flat road, the motor oil return end 37 is located above the liquid level of the oil 41 in the oil storage chamber. When the vehicle tilts left or right, the wheel-side electric drive bridge tilts left or right, and the wheels 5 at both ends of the wheel-side electric drive bridge are one high and one low. At this time, the oil gathers on one side of the oil storage chamber, but because the motor oil return end 37 is set at the center, it can be kept above the liquid level to prevent oil backflow. When the vehicle tilts front and back, the motor oil return end 37 can also be kept above the liquid level. The reducer oil return end is the same as the motor oil return end 37. In other embodiments, the oil return end may not be set at the center of the oil storage chamber, but may be set at the side wall of the bottom shell. In order to prevent oil backflow, a one-way valve may be set at the oil return end.

[0039] The motor of the wheel-side mechanism 2 is a wheel-side motor 21, which adopts an oil-cooled flat wire motor, and the reducer is a wheel-side reducer 22. A small amount of oil will remain at the bottom of the shell of the wheel-side motor 21 and form the motor bottom oil 42. The motor bottom oil 42 will flood a part of the stator 212 of the wheel-side motor 21 but not the rotor 211. An interface for connecting the motor oil return pipe 36 is set at the bottom of the motor shell. The end of the motor oil return pipe 36 connected to the interface is a bent pipe structure, so that the part of the motor oil return pipe 36 that passes through the bottom shell 11 is higher than the interface, that is, higher than the bottom of the inner cavity of the motor shell, and the bottom surface height of the bottom shell 11 is lower than the bottom height of the motor. The bottom of the oil storage cavity is lower than the bottom of the motor, which ensures the normal reflux of oil and is also beneficial to reduce the layout height of the motor.

[0040] The lubricating oil in the oil storage chamber is filtered through the coarse filter element 31, extracted by the oil pump 32 and transported to the oil cooler 33. After being cooled by the oil cooler 33, the lubricating oil is transported to the fine filter element 34. The lubricating oil filtered by the fine filter element 34 is distributed to the wheel-side mechanisms 2 at both ends. The clean and cooled lubricating oil is transported to the corresponding wheel-side motors 21 and wheel-side reducers 22 through the oil outlet pipe 35. The lubricating oil transported to the wheel-side motors 21 and wheel-side reducers 22 is cooled and lubricated and then returned to the oil storage chamber of the bridge frame 1 through the corresponding oil return pipe.

[0041] The wheel-side electric drive axle is a distributed wheel-side electric drive axle that uses common lubrication and cooling for the wheel-side motor and the wheel-side reducer. By integrating the oil pan and the bridge frame, the wheel-side motor housing does not need to be provided with an oil pan, which can reduce the volume and weight of the wheel-side motor, improve the power density, and increase the width of the in-vehicle aisle. The oil storage chamber is integrated in the middle of the bridge frame for better heat dissipation. The return end of the oil return pipe is designed at the center of the oil storage chamber, so that the oil is not easy to flow back into the motor when it shakes, and the return oil flow is not affected, ensuring the return speed. The motor and reducer are co-lubricated, and the reducer lubricating oil will not enter the motor, so that impurities such as iron filings in the reducer lubricating oil are not easily adsorbed on the motor. The reducer does not need to use separate splash lubrication, and the transmission efficiency is high. It is suitable for low-floor buses.

[0042] Embodiment 2 of the wheel-side electric drive axle of the present invention: The wheel side electric drive axle in this embodiment is different from the wheel side electric drive axle in the embodiment 1 described above only in that: Figure 5 , Figure 6 , Figure 7As shown, the motor oil return ends 37 of the motor oil return pipes 36 of the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge are connected through a connecting pipe 61, and an oil port is provided on the connecting pipe 61 to communicate the oil return end with the inner cavity of the main housing. A valve ball 62 is movably provided in the connecting pipe 61, and the valve ball 62 has a state of anti-backflow when the axle is tilted to block the corresponding oil return end. The oil port on the pipe wall of the connecting pipe 61 allows the lubricating oil to flow freely, and the valve ball 62 is a steel ball. The valve ball 62 can roll freely in the pipe cavity of the connecting pipe 61. The connecting pipe 61 and the valve ball 62 are located at the center of the oil storage cavity. In this way, when the vehicle tilts left and right, the motor oil return ends 37 on both sides are high and low, and the valve ball 62 will roll to the low oil return end to block the oil return port, preventing the dirty lubricating oil in the oil storage cavity from flowing back into the motor through the oil return port of the oil return pipe, thereby improving the reliability of anti-backflow.

[0043] Embodiment of the bridge frame of the wheel side electric drive bridge of the present invention: The bridge frame of the wheel-side electric drive axle in this embodiment has the same structure as the bridge frame in the above-mentioned embodiment 1 or 2 of the wheel-side electric drive axle, and will not be described in detail here.

[0044] Embodiments of the vehicle of the present invention: The vehicle includes a wheel-side electric drive axle. The wheel-side electric drive axle in this embodiment has the same structure as the wheel-side electric drive axle in Embodiment 1 or 2 of the above-mentioned wheel-side electric drive axle, and will not be described in detail here.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bridge frame of a wheel-side electric drive bridge, characterized in that: It includes a main shell, and mounting seats for installing the wheel side mechanism are respectively provided at both ends of the main shell. The inner cavity of the main shell forms an oil storage chamber. The main shell is provided with an oil circuit connecting structure, and the oil circuit connecting structure is used to connect a circulating oil circuit for circulating oil supply to the wheel side mechanism. The oil storage chamber has a space for communicating with the oil outlet end and the oil return end of the circulating oil circuit.

2. The bridge frame of the wheel-side electric drive bridge according to claim 1 is characterized in that: The main shell comprises a bottom shell and a cover plate, the mounting seat is connected to the bottom shell, the bottom shell has an upward opening, and the cover plate is mounted at the upward opening of the bottom shell and surrounds the inner cavity of the main shell.

3. The bridge frame of the wheel-side electric drive bridge according to claim 1 or 2, characterized in that: An oil baffle plate for preventing oil from shaking is arranged in the inner cavity of the main shell, and an oil hole for communicating the spaces on both sides of the oil baffle plate is arranged at the bottom of the oil baffle plate.

4. A wheel-side electric drive axle, characterized in that: It comprises a bridge frame, a wheel side mechanism arranged on the bridge frame, and a circulating oil circuit for circulating oil supply to the wheel side mechanism. The bridge frame is the bridge frame of the wheel side electric drive bridge described in any one of claims 1 to 3.

5. The wheel-side electric drive axle according to claim 4 is characterized in that: The oil return end of the circulating oil circuit is located at the center of the horizontal section of the inner cavity of the main housing of the bridge frame to maintain the oil level in the main housing above the liquid level when the axle is tilted.

6. The wheel-side electric drive axle according to claim 5 is characterized in that: The return oil ends of the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge are connected through connecting pipes. An oil passage is provided on the connecting pipe to connect the return oil end with the inner cavity of the main shell. A valve ball is movably provided in the connecting pipe. The valve ball has the function of moving downward to block the corresponding return oil end to prevent backflow when the axle is tilted.

7. The wheel-side electric drive axle according to claim 4, 5 or 6, characterized in that: The oil stored in the inner cavity of the main housing is lubricating oil, and the lubricating oil sent into the motor of the wheel side mechanism by the circulating oil passage has a portion flowing through the movable parts of the motor.

8. The wheel-side electric drive axle according to claim 7 is characterized in that: The circulating oil circuit includes a reducer oil channel arranged on the reducer of the wheel side mechanism and a motor oil channel arranged on the motor of the wheel side mechanism. The lubricating oil entering the reducer through the reducer oil channel cools and lubricates the reducer, and the lubricating oil entering the motor through the motor oil channel cools and lubricates the motor.

9. The wheel-side electric drive axle according to claim 4, 5 or 6, characterized in that: The circulating oil circuit includes an oil pump and an oil cooler, and the circulating oil circuits corresponding to the wheel side mechanisms at both ends of the bridge frame share a set of oil pumps and oil coolers.

10. A vehicle, characterized in that: It includes the wheel-side electric drive axle as described in any one of claims 4 to 9.

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