CN219712284U - A lubrication structure for an electric axle - Google Patents

Abstract

The utility model provides a lubricating structure of an electric axle, which comprises a first shell, a second shell, an end cover, a bearing cover plate and a first oil collecting cover, wherein the first shell is matched with the second shell to form an input shaft cavity, an intermediate shaft cavity, a gear shifting shaft cavity and an output shaft cavity, the input shaft cavity, the intermediate shaft cavity and the gear shifting shaft cavity are communicated, and the gear shifting shaft cavity is communicated with the output shaft cavity. The characteristics of gear rotation stirring lubricating oil are fully utilized, and through setting up suitable oil baffle, oil collecting cover and oil duct, the lubricating oil is full of whole power assembly, accomplishes the lubrication of whole power assembly, and simple structure is reliable, the loss of power consumption is little, improves system transmission efficiency. The utility model eliminates the oil pump, saves the space and materials of the shell, and has the advantages of compact structure and light weight.

Description

A lubrication structure for an electric axle

Technical field

The utility model relates to the technical field of automobile parts manufacturing, and in particular to a lubrication structure for an electric axle.

Background technique

At present, the power system of a new energy electric axle is generally composed of a motor, a reducer, a transmission and a differential. Its structure is relatively compact and equipped with multiple gears and bearings. Therefore, the power system of an electric axle often faces lubrication problems. problem. Since the input shaft is at the end of the transmission system, when there are many gear transmission stages, the lubricating oil cannot lubricate the input shaft and corresponding gears only through gear transmission. Although some existing vehicles use mechanical gear oil pumps or electronic oil pumps for active lubrication. to solve the lubrication problem. However, due to the addition of an oil pump, the power loss of the system is increased, the transmission efficiency is reduced, and sufficient space must be left for the oil pump, which increases the volume and mass of the housing. When the oil pump fails, some gears cannot be obtained in time. Effective lubrication seriously affects driving safety.

Utility model content

Therefore, the present utility model provides a lubrication structure for an electric axle, which can overcome the additional power loss of the transmission system and the reduction of transmission efficiency due to the addition of an oil pump in the prior art, and sufficient space must be left for the oil pump. The volume and mass of the housing are increased. When the oil pump fails, some gears cannot be effectively lubricated in time, which seriously affects driving safety.

In order to solve the above problems, the present invention provides a lubrication structure for an electric axle, which includes a first shell, a second shell, an end cover, a bearing cover and a first oil collecting cover. The first shell and the second The housing is adapted to form an input shaft cavity, a countershaft cavity, a shift shaft cavity, and an output shaft cavity. The input shaft cavity, the countershaft cavity, and the shift shaft cavity are in communication with the shift shaft cavity. The output shaft cavities are connected.

The first shell is provided with an input shaft oil inlet passage, an input shaft oil outlet passage, an intermediate shaft first oil inlet passage and an output shaft oil baffle. The input shaft oil inlet passage is located between the input shaft cavity and the said output shaft oil baffle. between the intermediate shaft cavity, the input shaft oil outlet passage is located in the input shaft cavity, the first oil inlet passage of the intermediate shaft is located between the intermediate shaft cavity and the shift shaft cavity, the output shaft The oil baffle is adapted to the first shell to form an oil storage cavity for storing lubricating oil. The lubricating oil flows from the oil storage cavity into the shift shaft cavity and passes through the first oil inlet passage of the intermediate shaft. Enters the intermediate shaft cavity, enters the input shaft cavity through the input shaft oil inlet passage, flows out through the input shaft oil outlet passage, and finally flows back to the oil storage cavity, so that the lubricating oil can fill all the Describe the internal space on the first shell side.

The second shell is provided with a connecting oil passage, a second intermediate shaft oil inlet passage, an intermediate shaft oil outlet passage, a shift shaft oil collection passage, a shift shaft oil collecting plate and a shift shaft oil inlet passage. The shift shaft The oil collection passage is located at the gear meshing point between the intermediate shaft cavity and the shift shaft cavity. The lubricating oil in the oil storage cavity flows to the gear meshing position through the shift shaft oil collection passage. The shaft oil collection plate is connected to the shift shaft oil inlet passage and the intermediate shaft second oil inlet passage. The shift shaft oil collection plate collects lubricating oil at the gear mesh, and a part of the lubricating oil passes through the gear mesh. The second oil inlet passage of the intermediate shaft flows into the intermediate shaft cavity, and the connecting oil passage connects the intermediate shaft cavity and the input shaft cavity and is used to adjust the amount of lubricating oil in the two chambers to enable the The lubricating oil fills the second shell side internal space.

The end cover is installed on the second shell and is provided with an end cover oil passage. The end cover oil passage is connected to the shift shaft oil inlet passage. The shift shaft oil collection plate collects the gear meshing Another part of the lubricating oil flows into the end cap.

The bearing cover is installed on the first shell and is located in the intermediate shaft cavity, and the first oil collecting cover is disposed on the bearing cover.

In some embodiments, the first shell is further provided with a first oil collecting plate of the intermediate shaft, and the first oil collecting plate of the intermediate shaft is connected to the side of the first oil inlet of the intermediate shaft close to the output shaft cavity. The vertical wall extends toward the gear in the shift shaft cavity.

In some embodiments, the highest point of the input shaft oil outlet is lower than the lowest point of the input shaft oil inlet.

In some embodiments, the second shell is further provided with a second oil collecting plate of the intermediate shaft, and one end of the second oil collecting plate of the intermediate shaft is connected to the second oil inlet passage of the intermediate shaft and is close to the output shaft cavity. The vertical wall on one side is connected to the shift shaft oil collecting plate on the other end.

In some embodiments, the shift shaft oil collecting plate is an L-shaped structure, including a vertical wall and a transverse wall, and the angle between the transverse wall and the horizontal direction is 3° to 10°.

In some embodiments, the lubrication structure of the electric axle further includes a second oil collecting cover, and the second oil collecting cover is disposed on the bearing cover opposite to the first oil collecting cover.

In some embodiments, the first oil collecting cover and the second oil collecting cover have flange structures to surround the gear structure in the countershaft cavity.

In some embodiments, the input shaft cavity is provided with reinforcing ribs.

The utility model provides a lubrication structure for an electric axle, which makes full use of the characteristics of gear rotation to stir lubricating oil. By setting appropriate oil baffles, oil collecting covers and oil passages, the lubricating oil fills the entire power assembly, completing the lubricating oil assembly. Lubricating the entire powertrain, the structure is simple and reliable, the power consumption loss is small, and the system transmission efficiency is improved. This application eliminates the oil pump, which can save housing space and materials, and has the advantages of compact structure and lightweight.

Description of drawings

Figure 1 is a schematic structural diagram of the lubrication structure of an electric axle according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the first shell assembly structure of the lubrication structure of the electric axle according to the embodiment of the present invention;

Figure 3 is a schematic diagram of the assembly structure of the second shell of the lubrication structure of the electric axle according to the embodiment of the present invention;

Figure 4 is a flow path diagram of the first shell lubricating oil of the lubrication structure of the electric axle according to the embodiment of the present invention;

Figure 5 is a flow path diagram of the second shell lubricating oil of the lubrication structure of the electric axle according to the embodiment of the present invention;

Figure 6 is a partial cross-sectional view of the oil passage of the lubrication structure of the electric axle according to the embodiment of the present invention;

Figure 7 is a schematic structural diagram of the end cover of the lubrication structure of the electric axle according to the embodiment of the present invention.

The reference symbols are expressed as:

1. The first shell; 11. The input shaft oil inlet passage; 111. The oil guide gap; 12. The input shaft oil outlet passage; 13. The first oil inlet passage of the intermediate shaft; 14. The first oil collection plate of the intermediate shaft; 15. Shift shaft oil baffle; 16. Output shaft oil baffle; 2. Second housing; 21. Unicom oil passage; 22. Second oil inlet passage of intermediate shaft; 23. Second oil collection plate of intermediate shaft; 24. Middle Shaft oil outlet; 25. Shift shaft oil collection passage; 26. Shift shaft oil collection plate; 27. Shift shaft oil inlet passage; 3. End cover; 31. End cover oil passage; 4. Bearing cover plate; 5. First oil collecting cover; 6. Second oil collecting cover; 71. Input shaft cavity; 711. Input shaft gear; 72. Intermediate shaft cavity; 721. First intermediate shaft gear; 722. Second intermediate shaft gear; 73. Shift shaft cavity; 731. First gear of shift shaft; 732. Second gear of shift shaft; 733. Third gear of shift shaft; 74. Output shaft cavity; 741. Output shaft gear.

Detailed ways

Referring to Figures 1 to 7, Figure 2 is a schematic diagram of the first shell assembly structure of the lubrication structure of the electric axle according to the embodiment of the present invention. The X-axis direction in Figure 2 is set to the horizontal direction, and the Z-axis direction is set to is the vertical direction up and down, and the direction perpendicular to the paper is set as the Y-axis direction. According to an embodiment of the present invention, a lubrication structure for an electric axle is provided, which includes a first shell 1, a second shell 2, an end cover 3, a bearing cover 4 and a first oil collecting cover 5. The first shell 1 is adapted to the second housing 2 to form an input shaft cavity 71, an intermediate shaft cavity 72, a shift shaft cavity 73 and an output shaft cavity 74. The input shaft cavity 71, the intermediate shaft cavity 72 and the shift shaft cavity are The gear shaft cavity 73 communicates with the gear shift shaft cavity 73 and the output shaft cavity 74 .

The first housing 1 is provided with an input shaft oil inlet passage 11, an input shaft oil outlet passage 12, an intermediate shaft first oil inlet passage 13 and an output shaft oil baffle 16. The input shaft oil inlet passage 11 is located on the Between the input shaft cavity 71 and the intermediate shaft cavity 72, the input shaft oil outlet passage 12 is located in the input shaft cavity 71, and the intermediate shaft first oil inlet passage 13 is located between the intermediate shaft cavity 72 and the intermediate shaft cavity 72. Between the shift shaft chamber 73, the output shaft oil baffle 16 is adapted to the first housing 1 to form an oil storage chamber for storing lubricating oil. The lubricating oil flows from the oil storage chamber into the The shift shaft cavity 73 enters the intermediate shaft cavity 72 through the first oil inlet passage 13 of the intermediate shaft, enters the input shaft cavity 71 through the input shaft oil inlet passage 11, and enters the input shaft oil outlet passage 12 flows out, and finally flows back to the oil storage chamber, so that the lubricating oil can fill the internal space on the first shell 1 side.

The second housing 2 is provided with a connecting oil passage 21, a second intermediate shaft oil inlet passage 22, an intermediate shaft oil outlet passage 24, a shift shaft oil collection passage 25, a shift shaft oil collection plate 26 and a shift shaft inlet passage. The oil passage 27 and the shift shaft oil collection passage 25 are located at the gear meshing point between the intermediate shaft cavity 72 and the shift shaft cavity 73. The lubricating oil in the oil storage cavity passes through the shift shaft oil collection passage 25. flows to the gear meshing point, and the shift shaft oil collection plate 26 is connected to the shift shaft oil inlet passage 27 and the intermediate shaft second oil inlet passage 22, and the shift shaft oil collection plate 26 collects the Lubricating oil at the gear mesh, part of which flows into the intermediate shaft cavity 72 through the second oil inlet passage 22 of the intermediate shaft, and the connecting oil passage 21 connects the intermediate shaft cavity 72 and the input shaft The chamber 71 is used to adjust the amount of lubricating oil in the two chambers so that the lubricating oil can fill the internal space on the second shell 2 side.

The end cover 3 is installed on the second shell 2 and is provided with an end cover oil passage 31. The end cover oil passage 31 is connected to the shift shaft oil inlet passage 27. The shift shaft oil collection plate 26 collects another part of the lubricating oil at the gear mesh and flows into the end cover 3 .

The bearing cover 4 is installed on the first shell 1 and is located in the intermediate shaft cavity 72 . The first oil collecting cover 5 is provided on the bearing cover 4 .

In a specific embodiment, the first shell 1 is also provided with a first oil collecting plate 14 of the intermediate shaft. The first oil collecting plate 14 of the intermediate shaft is connected to the first oil inlet passage 13 of the intermediate shaft and is close to the first oil collecting plate 14 of the intermediate shaft. The vertical wall on one side of the output shaft cavity 74 extends toward the gear in the shift shaft cavity 73 .

In a specific embodiment, the highest point of the input shaft oil outlet passage 12 is lower than the lowest point of the input shaft oil inlet passage 11 .

In a specific embodiment, the second shell 2 is also provided with a second intermediate shaft oil collecting plate 23, one end of which is connected to the intermediate shaft second oil inlet passage 22 and is close to the intermediate shaft second oil collecting plate 23. The vertical wall on one side of the output shaft cavity 74 is connected to the shift shaft oil collecting plate 26 at the other end.

In a specific embodiment, the shift shaft oil collecting plate 26 is an L-shaped structure, including a vertical wall and a transverse wall, and the angle between the transverse wall and the horizontal direction is 3° to 10°.

In a specific embodiment, the lubrication structure of the electric axle also includes a second oil collecting cover 6, which is arranged on the bearing cover 4 opposite to the first oil collecting cover 5. .

In a specific embodiment, the first oil collecting cover 5 and the second oil collecting cover 6 have a flange structure to surround the internal gear structure of the intermediate shaft cavity 72 .

In a specific embodiment, the input shaft cavity 71 is provided with reinforcing ribs.

Example 1

As shown in Figure 1, a lubrication structure for an electric axle includes a first shell 1, a second shell 2, an end cover 3, a bearing cover 4, a first oil collecting cover 5 and a second oil collecting cover 6. An input shaft cavity 71 , an intermediate shaft cavity 72 , a shift shaft cavity 73 and an output shaft cavity 74 are provided between the first housing 1 and the second housing 2 .

As shown in FIG. 2 , the first shell 1 is provided with reinforcing ribs at the input shaft cavity 71 to ensure the opening of the oil passage and increase the supporting rigidity of the bearing. The first housing 1 is provided with bolt mounting holes in the intermediate shaft cavity 72 for mounting the bearing cover 4 , the first oil collecting cover 5 and the second oil collecting cover 6 . The first shell 1 is funnel-shaped at the shift shaft cavity 73 and can collect lubricating oil; the first shell 1 has a clearance of 2 mm to 5 mm from the output shaft gear 741 at the output shaft cavity 74 .

As shown in FIG. 2 , the second housing 2 has a funnel shape at the input shaft cavity 71 for collecting oil, and the minimum gap between the second housing 2 and the input shaft gear 711 is 6 mm to 10 mm. The second shell 2 has a radial clearance of 4 mm to 8 mm at the counter shaft cavity 72 and the second gear 722 of the counter shaft. The second shell 2 has a radial gap with the second gear 722 of the shift shaft at the shift shaft cavity 73 . The radial clearance of gear 732 is 4mm~8mm. The second housing 2 has a radial gap of 2 mm to 5 mm with the output shaft gear 741 at the output shaft cavity 74 .

As shown in Figure 3, the first housing 1 is provided with an input shaft oil inlet passage 11, an input shaft oil outlet passage 12, an intermediate shaft first oil inlet passage 13, an intermediate shaft first oil collection plate 14, and a shift shaft. Oil baffle plate 15 and output shaft oil baffle plate 16, the input shaft oil inlet passage 11, the input shaft oil outlet passage 12, the intermediate shaft first oil inlet passage 13, and the intermediate shaft first oil collection plate 14. The shift shaft oil baffle 15 and the output shaft oil baffle 16 are both cast on the first shell.

As shown in Figure 3, the second housing 2 is provided with a connecting oil passage 21, a second intermediate shaft oil inlet passage 22, a second intermediate shaft oil collection plate 23, an intermediate shaft oil outlet passage 24, and a shift shaft oil collection plate. channel 25, shift shaft oil collection plate 26 and shift shaft oil inlet passage 27; the connecting oil passage 21, the intermediate shaft second oil inlet passage 22, the intermediate shaft second oil collection plate 23, the The intermediate shaft oil outlet passage 24 , the shift shaft oil collection passage 25 , the shift shaft oil collection plate 26 and the shift shaft oil inlet passage 27 are all cast on the second shell 2 .

As shown in Figures 1, 2 and 3, the input shaft oil inlet passage 11 and the input shaft oil outlet passage 12 are provided in the input shaft cavity 71; the intermediate shaft first oil inlet passage 13, The first oil collecting plate 14 of the intermediate shaft, the second oil inlet passage 22 of the intermediate shaft, the second oil collecting plate 23 of the intermediate shaft, and the oil outlet passage 24 of the intermediate shaft are arranged in the intermediate shaft cavity 72 ; The shift shaft oil baffle 15, the shift shaft oil collection passage 25, the shift shaft oil collection plate 26, and the shift shaft oil inlet passage 27 are provided in the shift shaft cavity 73; The output shaft oil baffle 16 is disposed in the output shaft cavity 74 .

As shown in Figure 7, the end cover 3 is provided with an end cover oil passage 31, which is installed on the first shell 1 through bolts.

As shown in Figures 1 and 2, the bearing cover 4 is installed on the first shell 1, and the first oil collecting cover 5 and the second oil collecting cover 6 are installed on the bearing cover 4 On the top, the bearing cover 4, the first oil collecting cover 5 and the second oil collecting cover 6 are all installed on the first housing 1 through bolts; the input shaft oil inlet passage 11 is in the shape of a trumpet. , and the angle with the horizontal direction is 3° to 10°, and the gap with the rim of the first gear 721 of the intermediate shaft is 2mm to 5mm. The highest point of the input shaft oil outlet passage 12 is lower than the lowest point of the input shaft oil inlet passage 11 . The first oil inlet passage 13 of the intermediate shaft has an included angle of 3° to 10° with the horizontal direction, and is connected to the first oil collecting plate 14 of the intermediate shaft. The radial gap between the first oil collecting plate 14 of the intermediate shaft and the rim of the first gear 731 of the shift shaft is 2 mm to 5 mm. The shift shaft oil baffle 15 is concentric with the shift shaft first gear 731, and the radial gap is 2 mm to 5 mm. The output shaft oil baffle 16 is concentric with the output shaft gear 741, and the radial gap is 2 mm to 5 mm.

As shown in Figures 1 and 2, the inner diameter of the bearing cover 4 is concentric with the first gear 721 of the intermediate shaft, and the first oil collecting cover 5 is installed below the bearing cover 4 through bolts, and is connected to the first oil collecting cover 5. The first gear 721 of the intermediate shaft is concentric and has a radial clearance of 2 mm to 5 mm. The clearance between the top end of one side of the first oil collecting cover 5 and the input shaft oil inlet passage 11 is 2 mm to 5 mm. The second oil collecting cover 6 is installed above the cover plate 4 through bolts, and the radial clearance with the first gear 721 of the intermediate shaft increases from small to large, on the side away from the input shaft oil inlet passage 11 The rim clearance between the first gear 721 of the intermediate shaft is 3 mm to 5 mm, and the rim clearance between the side close to the input shaft oil inlet 11 and the first gear 721 of the intermediate shaft is 5 mm to 8 mm. The oil inlet passage 11 is provided with an oil guide gap 111, and the oil guide gap 111 can be formed by machining or direct casting. The gap between one end of the second oil collecting cover 6 and the oil guide gap 111 on the input shaft oil inlet passage 11 is 2 mm to 5 mm; the first oil collecting cover 5 and the second oil collecting cover 6 have It has a flanging structure that can wrap the countershaft gear.

As shown in FIGS. 1 and 3 , the connecting oil passage 21 communicates with the input shaft cavity 71 and the intermediate shaft cavity 72 , and is located on the lower side of the input shaft cavity 71 and the intermediate shaft cavity 72 . The second oil inlet passage 22 of the intermediate shaft is located above the opposite side of the connecting oil passage 21, and has an angle of 20° to 50° with the horizontal direction. The second oil collecting plate 23 of the intermediate shaft is connected to the bottom edge of the second oil inlet passage 22 of the intermediate shaft, and is arranged parallel to the second oil inlet passage 22 of the intermediate shaft; the oil outlet passage 24 of the intermediate shaft is located at The connecting oil channel 21 is located below the opposite side, and the lowest point is higher than the highest point of the connecting oil channel 21 .

As shown in Figures 1, 3 and 6, the shift shaft oil collection passage 25 has an angle of 3° to 10° with the X-direction horizontal, and the inside of the oil passage is inclined downward, with an angle of 3° with the Y-direction. ~10°, one end of the shift shaft oil collecting passage 25 opens toward the second gear 732 of the shift shaft, and the radial gap is 1 mm to 5 mm, and the other end opens toward the second gear 722 of the intermediate shaft and the shift The meshing point of the third gear 733 of the shift shaft; the shift shaft oil collecting plate 26 has an L-shaped structure, and the radial clearance with the rim of the third gear 733 of the shift shaft is 1 mm to 5 mm. The L-shaped bottom edge is in the X direction The horizontal included angle is 3° to 10°, and it is inclined downward, and the included angle with the Y-axis direction is 3° to 10°. The L-shaped vertical side intersects with the second oil collecting plate 23 of the intermediate shaft. The shift shaft oil inlet passage 27 is located at the end of the shift shaft oil collecting plate 26. The shift shaft oil inlet passage 27 and the second intermediate shaft oil collecting plate 23 are arranged in a figure-eight shape and are connected with the second oil collecting plate 23 of the intermediate shaft. The end cover oil passage 31 provided on the end cover is connected.

The working principle of this utility model is:

As shown in Figures 2 and 3, the first gear 731 of the shift shaft, the second gear 732 of the shift shaft and the third gear 733 of the shift shaft are coaxial, and the first gear 721 of the intermediate shaft and the second gear 722 of the intermediate shaft are coaxial. , the output shaft gear 741 meshes with the first gear 731 of the shift shaft, the first gear 721 of the intermediate shaft meshes with the second gear 732 of the shift shaft, the second gear 722 of the intermediate shaft meshes with the third gear 733 of the shift shaft and the input gear respectively. The shaft gear 711 meshes.

As shown in Figures 4 and 5, the initial position of the gear oil is located in the output shaft cavity. On the first housing side, the gear oil is stirred by the output shaft gear 741, and the gear oil moves along the output shaft oil baffle 16 to reach the first gear 731 of the shift shaft. A part of the gear oil is stirred by the first gear 731 of the shift shaft, and the other part is stirred by the first gear 731 of the shift shaft. Part of it is collected at the bottom of the shift shaft cavity 73; the gear oil stirred by the first gear 731 of the shift shaft is collected by the shift shaft oil baffle 15, so that the gear oil is collected at the funnel-shaped structure of the shift shaft cavity 73 , the gear oil will flow to the bearings along the wall of the shift shaft cavity 73 respectively, where the oil will flow out through the bearing gap. Since the shift shaft cavity 73 and the output shaft cavity 74 are not completely independent closed areas, the oil will directly flow out after It enters the output shaft cavity 74 and is collected by the first oil collecting plate 14 of the intermediate shaft and enters the intermediate shaft cavity 72 through the first oil inlet passage 13 of the intermediate shaft to lubricate the bearings there. The oil flows out through the bearing gap and is collected by the first oil collector after flowing out. The oil collecting cover 5 collects the gear oil accumulated at the bottom of the shift shaft cavity 73 and is stirred by the second gear 732 of the shift shaft. The second gear 732 of the shift shaft meshes with the first gear 721 of the countershaft. The gear oil reaches the middle through the meshing. At the first gear 721 of the shaft, during the rotation of the first gear 721 of the intermediate shaft, it is collected by the first oil collecting cover 5 and the second oil collecting cover 6. The first oil collecting cover 5 collects the bottom gear oil and guides it to the input Shaft oil inlet passage 11, the second oil collecting cover 6 collects the top gear oil and guides it to the oil guide gap 111, and finally enters the input shaft oil inlet passage 11. The gear oil will lubricate the first shell side input shaft bearing and exit from the input shaft. The oil passage 12 flows out, and then enters the intermediate shaft cavity 72. The input shaft oil outlet passage 12 is connected to the intermediate shaft cavity 72, and the intermediate shaft cavity 72 is connected to the shift shaft cavity 73. When the lubricating oil in the shift shaft cavity 73 When it is too much, it will exceed the edge of the shift shaft cavity 73 and flow into the output shaft cavity 74 .

On the second housing side, the gear oil is stirred by the output shaft gear 741. The gear oil moves along the output shaft oil baffle 16 to reach the first gear 731 of the shift shaft. The gear oil accumulates at the bottom of the shift shaft cavity 73 and is replaced. The second gear 732 of the gear shaft stirs. During the rotation of the second gear 732 of the gear shaft, the gear oil is collected by the oil collecting passage 25 of the gear shaft and flows along the oil passage to the second gear 722 of the intermediate shaft and the third gear 722 of the gear shaft. The meshing point of gear 733; during the rotation of the third gear 733 of the shift shaft, part of the gear oil is collected by the shift shaft oil collecting plate 26 and flows along the shift shaft oil inlet passage 27 to the end cover oil passage 31 for final lubrication. There are 3 bearings in the end cover. There is no oil return passage on the bearing cover. It flows out through the bearing gap and enters the intermediate shaft cavity 72. The intermediate shaft cavity 72 is connected with the shift shaft cavity 73. When the lubricating oil in the shift shaft cavity 73 When it is too much, it will exceed the edge of the shift shaft cavity 73 and flow into the output shaft cavity 74 . Another part of the gear oil is thrown by the third gear 733 of the shift shaft to the wall of the intermediate shaft cavity 72 along the gear helix angle. This part of the lubricating oil enters the second oil inlet passage 22 of the intermediate shaft through the second oil collecting plate 23 of the intermediate shaft; The second shell is funnel-shaped at the input shaft cavity 71, and the gear oil can flow to the bottom of the funnel along the helix angle of the input shaft gear 711 to lubricate the input shaft bearing on the second shell side; a connecting oil is provided at the bottom of the input shaft cavity 71 and the intermediate shaft cavity 72 21 and the intermediate shaft oil outlet passage 24. The oil enters the intermediate shaft cavity 72 from the second oil inlet passage 22 of the intermediate shaft. The oil balance in the intermediate shaft cavity 72 and the input shaft cavity 71 is adjusted through the connecting oil passage 21. Finally, The oil flows from the intermediate shaft oil outlet passage 24 into the shift shaft cavity 73 and the intermediate shaft cavity 72 , and finally flows back into the output shaft cavity 74 .

The above descriptions are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the present utility model. Within the protection scope of utility model. The above are only the preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims (8)

1. A lubrication structure for an electric axle, characterized by comprising a first shell (1), a second shell (2), an end cover (3), a bearing cover (4) and a first oil collecting cover (5) ), the first housing (1) and the second housing (2) are adapted to form an input shaft cavity (71), an intermediate shaft cavity (72), a shift shaft cavity (73) and an output shaft cavity (74). ), the input shaft cavity (71), the intermediate shaft cavity (72) and the shift shaft cavity (73) are connected, and the shift shaft cavity (73) is connected with the output shaft cavity (74) ; The first housing (1) is provided with an input shaft oil inlet passage (11), an input shaft oil outlet passage (12), an intermediate shaft first oil inlet passage (13) and an output shaft oil baffle (16). The input shaft oil inlet channel (11) is located between the input shaft cavity (71) and the intermediate shaft cavity (72), and the input shaft oil outlet channel (12) is located in the input shaft cavity (71). , the first oil inlet passage (13) of the intermediate shaft is located between the intermediate shaft cavity (72) and the shift shaft cavity (73), and the output shaft oil baffle (16) is connected to the first oil inlet passage (13) of the intermediate shaft. The shell (1) is adapted to form an oil storage cavity for storing lubricating oil. The lubricating oil flows from the oil storage cavity into the shift shaft cavity (73) and passes through the first oil inlet passage (13) of the intermediate shaft. ) enters the intermediate shaft cavity (72), enters the input shaft cavity (71) through the input shaft oil inlet passage (11), flows out through the input shaft oil outlet passage (12), and finally flows back to the An oil storage chamber to enable the lubricating oil to fill the internal space on the side of the first shell (1); The second housing (2) is provided with a connecting oil passage (21), a second intermediate shaft oil inlet passage (22), an intermediate shaft oil outlet passage (24), a shift shaft oil collection passage (25), and a shift shaft. Shaft oil collection plate (26) and shift shaft oil inlet passage (27). The shift shaft oil collection passage (25) is located at the gear mesh between the intermediate shaft cavity (72) and the shift shaft cavity (73). , the lubricating oil in the oil storage chamber flows to the gear meshing part through the shift shaft oil collection passage (25), and the shift shaft oil collection plate (26) is connected to the shift shaft oil inlet passage (25). 27) and the second oil inlet passage (22) of the intermediate shaft, the shift shaft oil collection plate (26) collects the lubricating oil at the gear mesh, and part of the lubricating oil passes through the second oil inlet passage of the intermediate shaft. The oil inlet passage (22) flows into the intermediate shaft cavity (72), and the connecting oil passage (21) communicates with the intermediate shaft cavity (72) and the input shaft cavity (71), and is used to adjust the conditions in the two chambers. The amount of lubricating oil is enough to fill the internal space on the second shell (2) side with the lubricating oil; The end cover (3) is installed on the second housing (2), and is provided with an end cover oil passage (31). The end cover oil passage (31) is connected to the shift shaft oil inlet passage (27). ), the other part of the lubricating oil collected by the shift shaft oil collecting plate (26) at the gear mesh flows into the end cover (3); The bearing cover (4) is installed on the first shell (1) and is located in the intermediate shaft cavity (72). The first oil collecting cover (5) is provided on the bearing cover (1). 4) Go up. 2. The lubrication structure of the electric axle according to claim 1, characterized in that the first shell (1) is also provided with a first oil collecting plate (14) of the intermediate shaft, and the first oil collecting plate (14) of the intermediate shaft is The oil plate (14) is connected to the vertical wall on the side of the first oil inlet channel (13) of the intermediate shaft close to the output shaft cavity (74), and extends toward the gear in the shift shaft cavity (73). 3. The lubrication structure of an electric axle according to claim 1, characterized in that the highest point of the input shaft oil outlet (12) is lower than the lowest point of the input shaft oil inlet (11). . 4. The lubrication structure of the electric axle according to claim 1, characterized in that the second shell (2) is also provided with a second oil collecting plate (23) for the intermediate shaft, and the second oil collecting plate (23) for the intermediate shaft is One end of the oil plate (23) is connected to the vertical wall on the side of the second oil inlet passage (22) of the intermediate shaft close to the output shaft cavity (74), and the other end is connected to the shift shaft oil collecting plate (26). 5. The lubrication structure of the electric axle according to claim 1, characterized in that the shift shaft oil collection plate (26) is an L-shaped structure, including a vertical wall and a transverse wall, and the angle between the transverse wall and the horizontal direction It is 3°～10°. 6. The lubrication structure of an electric axle according to claim 1, further comprising a second oil collecting cover (6), the second oil collecting cover (6) and the first oil collecting cover (6) 5) Set relatively on the bearing cover (4). 7. The lubrication structure of an electric axle according to claim 6, characterized in that the first oil collecting cover (5) and the second oil collecting cover (6) have a flange structure to surround The internal gear structure of the intermediate shaft cavity (72). 8. The lubrication structure of an electric axle according to claim 1, characterized in that the input shaft cavity (71) is provided with reinforcing ribs.