Lubricating oil quantity control system for electric drive axle

Abstract

The invention provides an electric drive axle lubricating oil quantity control system which comprises a shell, an oil storage cavity is formed in the shell, a transmission shaft is arranged above the oil storage cavity, an oil feeding channel is formed in the transmission shaft, an oil collecting groove is formed in the inner wall of the shell, and the outer side of the transmission shaft is sequentially sleeved with a first rotating body, a second rotating body and a third rotating body in the axial direction. An oil collecting groove is formed in one end of the third rotating body; a plurality of oil slinging pieces are uniformly distributed on the outer side of the transmission shaft in the circumferential direction, the part, located between the first rotating body and the second rotating body, of each oil slinging piece is a radial oil feeding section, and the part, located between the second rotating body and the third rotating body, of each oil slinging piece is an axial oil feeding section; when the transmission shaft rotates, the radial oil feeding section can throw lubricating oil into the oil collecting groove, and the axial oil feeding section can throw the lubricating oil into the oil collecting groove. The second rotating body is connected with an adjusting assembly. The oil level and the lubricating oil supply amount can be adjusted according to the rotating speed of the transmission shaft, and the lubricating effect and the transmission efficiency are both considered at different rotating speeds.

Description

Technical Field

[0001] The invention relates to the field of automobiles, and in particular to a lubricating oil quantity control system for an electric drive axle. Background Art

[0002] The electric drive axle is usually located at the end of the vehicle's transmission system, responsible for changing the speed and torque of the power and transmitting the power to the drive wheels. At present, the integrated parallel shaft drive solution is widely used in electric drive axles. This solution directly connects the drive motor to the drive axle. Due to the high speed of the motor, the electric drive axle is designed with a multi-stage reduction structure. As an indispensable part of the reduction structure, lubricating oil is responsible for cooling, lubricating, and rust-proofing the gears and bearings of the reduction structure. Among them, splash lubrication, as one of the main lubrication methods, has the advantages of simple and compact structure.

[0003] However, the effect of splash lubrication is affected by the rotation speed of the transmission shaft and the oil level. When the rotation speed of the transmission shaft is low, the splashing ability is weak. At this time, it is appropriate to increase the oil level of the electric drive axle to increase the oil immersion depth of the gears and increase the lubricating oil supply to the bearings, thereby ensuring that the gears and bearings of the reduction structure can be fully lubricated. When the rotation speed of the transmission shaft is high, the splashing ability is strong. At this time, it is necessary to lower the oil level of the electric drive axle to reduce the oil immersion depth of the gears and reduce the lubricating oil supply to the bearings, thereby reducing the oil stirring energy consumption of the gears and bearings and improving the transmission efficiency. However, the traditional electric drive axle cannot adjust the oil level and lubricating oil supply according to the rotation speed of the transmission shaft, and it is difficult to take into account both the lubrication effect and the transmission efficiency at different speeds. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an electric drive axle lubricating oil quantity control system, which can adjust the oil level and lubricating oil supply according to the rotation speed of the transmission shaft, so as to achieve both lubrication effect and transmission efficiency at different rotation speeds.

[0005] The present invention adopts the following technical solutions.

[0006] An electric drive axle lubricating oil quantity control system comprises a housing, an oil storage chamber for storing lubricating oil is formed in the housing, a horizontally extending transmission shaft is arranged above the oil storage chamber, an oil delivery passage is formed in the transmission shaft, an oil collecting groove located in the radial direction of the transmission shaft is formed on the inner wall of the housing, a first rotating body, a second rotating body and a third rotating body are sequentially sleeved on the outer side of the transmission shaft along the axial direction, and an oil collecting groove connected to the oil delivery passage is formed at one end of the third rotating body close to the second rotating body;

[0007] The outer side of the transmission shaft is evenly distributed along the circumferential direction with a plurality of oil-slinging plates that pass through the second rotating body. The portion of the oil-slinging plates located between the first rotating body and the second rotating body is a radial oil-feeding section, and the portion of the oil-slinging plates located between the second rotating body and the third rotating body is an axial oil-feeding section.

[0008] When the transmission shaft rotates, the radial oil delivery section can throw the lubricating oil into the oil collection tank, and the axial oil delivery section can throw the lubricating oil into the oil collection tank;

[0009] The second rotating body is connected to an adjusting assembly, and the adjusting assembly can drive the second rotating body to move along its axial direction according to the rotation speed of the transmission shaft to change the length of the radial oil delivery section and the axial oil delivery section;

[0010] The length of the radial oil delivery section is proportional to the rotation speed of the transmission shaft, and the length of the axial oil delivery section is inversely proportional to the rotation speed of the transmission shaft.

[0011] Furthermore, the second rotating body is penetrated by an avoidance groove for the oil-slinging sheet to pass through and is slidably connected to the oil-slinging sheet.

[0012] Furthermore, the oil-slinging plate is a rigid structure, and the oil-slinging plate extends spirally along the axial direction of the transmission shaft.

[0013] Furthermore, the oil-slinging plate is an elastic structure, the head end and the tail end of the oil-slinging plate are connected to the transmission shaft as a whole, the radial oil-feeding section is horizontally arranged, and the axial oil-feeding section is inclined.

[0014] Furthermore, the elastic restoring force of the oil-slinging sheet causes the first rotating body to tend to move away from the third rotating body, and causes the second rotating body to tend to move closer to the first rotating body, and the first rotating body is slidably connected to the transmission shaft.

[0015] Further, the adjustment component includes a first permanent magnet and a second permanent magnet that repel each other;

[0016] The first permanent magnet is slidably connected to the first rotating body in the radial direction, an elastic member is connected between the first permanent magnet and the first rotating body, the elastic member makes the first permanent magnet tend to approach the axis of the first rotating body, and the distance from the first permanent magnet to the axis of the first rotating body is inversely proportional to the distance from the first permanent magnet to the second permanent magnet;

[0017] The second permanent magnet is connected to the second rotating body as a whole.

[0018] Furthermore, the adjustment component also includes a third permanent magnet that repel each other with the second permanent magnet, and the third permanent magnet is connected to the third rotating body as a whole.

[0019] Furthermore, the oil collecting groove is connected to an oil collecting chamber, and an oil discharge passage is connected between the oil collecting chamber and the oil storage cavity.

[0020] The beneficial effects of the present invention are:

[0021] The outer side of the transmission shaft of the present invention is evenly distributed along the circumferential direction with a plurality of oil-slinging plates that pass through the second rotating body. The portion of the oil-slinging plates located between the first rotating body and the second rotating body is the radial oil-feeding section, and the portion of the oil-slinging plates located between the second rotating body and the third rotating body is the axial oil-feeding section. When the transmission shaft rotates, the radial oil-feeding section throws the lubricating oil in the oil storage chamber into the oil collecting groove, and the axial oil-feeding section throws the lubricating oil in the oil storage chamber into the oil collecting groove. The lubricating oil entering the oil collecting groove will be temporarily stored, thereby lowering the oil level in the oil storage chamber; and the lubricating oil entering the oil collecting groove will be supplied to the bearing to be lubricated through the oil delivery channel. In addition, the second rotating body is connected to an adjusting component, which can drive the second rotating body to move along its axial direction according to the rotation speed of the transmission shaft, thereby changing the length of the radial oil-feeding section and the axial oil-feeding section.

[0022] Specifically, when the rotation speed of the transmission shaft decreases, the adjustment component drives the second rotating body to approach the first rotating body, which, on the one hand, shortens the length of the radial oil delivery section, thereby reducing the amount of oil entering the oil collecting groove, raising the oil level in the oil storage chamber, and increasing the oil immersion depth of the gear; on the other hand, lengthens the length of the axial oil delivery section, thereby increasing the amount of oil entering the oil collecting groove, and thereby increasing the lubricating oil supply to the bearing. In this way, both the gear and the bearing are fully lubricated.

[0023] Specifically, when the rotation speed of the transmission shaft increases, the adjustment component drives the second rotating body to approach the third rotating body, which, on the one hand, increases the length of the radial oil delivery section, thereby increasing the oil intake of the oil collecting groove, lowering the oil level in the oil storage chamber, and reducing the oil immersion depth of the gear; on the other hand, reduces the length of the axial oil delivery section, thereby reducing the oil intake of the oil collecting groove, and further reducing the lubricating oil supply to the bearing. In this way, the energy consumption of oil stirring of the gear and the bearing is reduced, and the transmission efficiency is improved.

[0024] It can be seen that the present invention can adjust the oil level and the amount of lubricating oil supplied according to the rotation speed of the transmission shaft, thereby achieving both lubrication effect and transmission efficiency at different rotation speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of one embodiment of the present invention;

[0027] Figure 2 for Figure 1AA structural diagram;

[0028] Figure 3 This is a schematic structural diagram of a second embodiment of the present invention;

[0029] Figure 4 for Figure 3 Schematic diagram of the BB structure.

[0030] Description of reference numerals:

[0031] Shell 1, oil collecting groove 11, oil collecting chamber 12, oil drain channel 13,

[0032] Transmission shaft 2, oil delivery channel 21,

[0033] The first rotating body 3,

[0034] The second rotating body 4,

[0035] The third rotating body 5, the oil collecting tank 51,

[0036] Oil throwing piece 6, radial oil delivery section 61, axial oil delivery section 62,

[0037] A first permanent magnet 71, a second permanent magnet 72, a third permanent magnet 73, an elastic member 74,

[0038] Positioning rib 8. DETAILED DESCRIPTION

[0039] The drawings are only used for illustrative purposes and should not be construed as limitations of this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product.

[0040] For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The technical solution of the present invention is further described below in conjunction with the drawings and embodiments.

[0041] As attached Figures 1 to 4 The lubricating oil quantity control system of an electric drive axle shown in the figure comprises a housing 1, an oil storage chamber for storing lubricating oil is formed in the housing 1, a horizontally extending transmission shaft 2 is arranged above the oil storage chamber, an oil delivery passage 21 is formed in the transmission shaft 2, an oil collecting groove 11 located in the radial direction of the transmission shaft 2 is opened on the inner wall of the housing 1, a first rotating body 3, a second rotating body 4 and a third rotating body 5 are sequentially sleeved on the outer side of the transmission shaft 2 in the axial direction, and an oil collecting groove 51 connected to the oil delivery passage 21 is opened at one end of the third rotating body 5 close to the second rotating body 4;

[0042] The outer side of the transmission shaft 2 is evenly distributed along the circumferential direction with a plurality of oil-slinging plates 6 passing through the second rotating body 4. The portion of the oil-slinging plates 6 located between the first rotating body 3 and the second rotating body 4 is a radial oil-feeding section 61, and the portion of the oil-slinging plates 6 located between the second rotating body 4 and the third rotating body 5 is an axial oil-feeding section 62.

[0043] When the transmission shaft 2 rotates, the radial oil delivery section 61 can throw the lubricating oil into the oil collecting groove 11, and the axial oil delivery section 62 can throw the lubricating oil into the oil collecting groove 51;

[0044] The second rotating body 4 is connected to an adjusting assembly, which can drive the second rotating body 4 to move along its axial direction according to the rotation speed of the transmission shaft 2 to change the length of the radial oil delivery section 61 and the axial oil delivery section 62;

[0045] The length of the radial oil delivery section 61 is proportional to the rotation speed of the transmission shaft 2 , and the length of the axial oil delivery section 62 is inversely proportional to the rotation speed of the transmission shaft 2 .

[0046] Specifically, the lubricating oil entering the oil collecting tank 11 will be temporarily stored, thereby reducing the oil level in the oil storage chamber; and the lubricating oil entering the oil collecting tank 51 will be supplied to the bearing to be lubricated through the oil delivery channel 21.

[0047] Specifically, when the rotation speed of the transmission shaft 2 decreases, the adjustment component drives the second rotating body 4 to approach the first rotating body 3, which reduces the length of the radial oil delivery section 61, thereby reducing the amount of oil entering the oil collecting groove 11, raising the oil level in the oil storage chamber, and increasing the oil immersion depth of the gear; on the other hand, the length of the axial oil delivery section 62 increases, thereby increasing the amount of oil entering the oil collecting groove 51, and correspondingly increasing the lubricating oil supply to the bearing. In this way, both the gears and the bearings are fully lubricated.

[0048] Specifically, when the rotation speed of the transmission shaft 2 increases, the adjustment component drives the second rotating body 4 to approach the third rotating body 5, which increases the length of the radial oil delivery section 61, thereby increasing the oil intake of the oil collecting groove 11, lowering the oil level in the oil storage chamber, and reducing the oil immersion depth of the gear; on the other hand, the length of the axial oil delivery section 62 decreases, thereby reducing the oil intake of the oil collecting groove 51, and reducing the lubricating oil supply to the bearing. In this way, the energy consumption of oil stirring of the gears and bearings is reduced, and the transmission efficiency is improved.

[0049] It can be understood that the third rotating body 5 can be a gear or a disc.

[0050] The second rotating body 4 is penetrated by an avoidance groove through which the oil-slinging piece 6 passes and is slidably connected to the oil-slinging piece 6 .

[0051] As an example, the attached Figure 1 and 2As shown, the oil-slinging plate 6 is a rigid structure, and the oil-slinging plate 6 extends in an axial spiral along the transmission shaft 2. During the rotation of the transmission shaft 2, the oil-slinging plate 6 will drive the lubricating oil in the oil storage chamber to move in the direction from the first rotating body 3 to the third rotating body 5. The lubricating oil between the first rotating body 3 and the second rotating body 4 will collide with the second rotating body 4 during the movement toward the third rotating body 5, thereby changing from axial movement to radial movement, and finally being thrown into the oil collecting tank 11. The lubricating oil between the second rotating body 4 and the third rotating body 5 is directly thrown into the oil collecting tank 51.

[0052] The adjustment component includes a first permanent magnet 71 and a second permanent magnet 72 that repel each other, and a third permanent magnet 73 that repel each other with the second permanent magnet 72;

[0053] The first permanent magnet 71 is slidably connected to the first rotating body 3 in the radial direction. An elastic member 74 is connected between the first permanent magnet 71 and the first rotating body 3. The elastic member 74 makes the first permanent magnet 71 tend to approach the axis of the first rotating body 3. The distance from the first permanent magnet 71 to the axis of the first rotating body 3 is inversely proportional to the distance from the first permanent magnet 71 to the second permanent magnet 72.

[0054] The second permanent magnet 72 is integrally connected to the second rotating body 4 , and the third permanent magnet 73 is integrally connected to the third rotating body 5 . In this example, a plurality of the first permanent magnet 71 , the second permanent magnet 72 and the third permanent magnet 73 are uniformly distributed along the circumference of the transmission shaft 2 .

[0055] The first rotating body 3 and the third rotating body 5 are connected to the transmission shaft 2 as a whole.

[0056] Specifically, when the transmission shaft 2 is stationary, the first permanent magnet 71 and the third permanent magnet 73 both generate magnetic repulsion on the second permanent magnet 72, thereby keeping the second rotating body 4 in a balanced position. When the rotation speed of the transmission shaft 2 increases, the first permanent magnet 71 overcomes the elastic restoring force of the elastic member 74 and moves in a direction away from the axis of the first rotating body 3. As the distance from the first permanent magnet 71 to the axis of the first rotating body 3 increases, the distance from the first permanent magnet 71 to the second permanent magnet 72 decreases accordingly, thereby increasing the magnetic repulsion of the first permanent magnet 71 on the second permanent magnet 72, thereby driving the second permanent magnet 72 to move in a direction close to the third rotating body 5.

[0057] As another example, Figure 3 and 4As shown, the oil-slinging piece 6 is an elastic structure, and the head and tail ends of the oil-slinging piece 6 are connected to the transmission shaft 2 as a whole, the radial oil-feeding section 61 is horizontally arranged, and the axial oil-feeding section 62 is inclined. It can be understood that the horizontally arranged radial oil-feeding section 61 can directly throw the lubricating oil directly from the first rotating body 3 and the second rotating body 4 into the oil collecting groove 11, and the inclined axial oil-feeding section 62 can directly throw the lubricating oil between the second rotating body 4 and the third rotating body 5 into the oil collecting groove 51. In this example, the head and tail ends of the oil-slinging piece 6 are connected to the transmission shaft 2 as a whole through the positioning ribs 8, and the side of the oil-slinging piece 6 is movably connected to the transmission shaft 2.

[0058] The elastic restoring force of the oil-slinging sheet 6 makes the first rotating body 3 tend to move away from the third rotating body 5 , and makes the second rotating body 4 tend to move closer to the first rotating body 3 . The first rotating body 3 is slidably connected to the transmission shaft 2 .

[0059] The adjustment component includes a first permanent magnet 71 and a second permanent magnet 72 that repel each other;

[0060] The first permanent magnet 71 is slidably connected to the first rotating body 3 in the radial direction. An elastic member 74 is connected between the first permanent magnet 71 and the first rotating body 3. The elastic member 74 makes the first permanent magnet 71 tend to approach the axis of the first rotating body 3. The distance from the first permanent magnet 71 to the axis of the first rotating body 3 is inversely proportional to the distance from the first permanent magnet 71 to the second permanent magnet 72.

[0061] The second permanent magnet 72 is integrally connected to the second rotating body 4 . In this example, a plurality of the first permanent magnet 71 and the second permanent magnet 72 are evenly distributed along the circumference of the transmission shaft 2 .

[0062] Specifically, when the transmission shaft 2 is stationary, the elastic restoring force of the oil-slinging sheet 6 causes the first rotating body 3 and the second rotating body 4 to move away from the third rotating body 5, and the magnetic repulsion between the first permanent magnet 71 and the second permanent magnet 72 causes the first rotating body 3 to move away from the second rotating body 4, so that the first rotating body 3 and the second rotating body 4 are both kept in a balanced position. When the rotation speed of the transmission shaft 2 increases, the first permanent magnet 71 overcomes the elastic restoring force of the elastic member 74 and moves in a direction away from the axis of the first rotating body 3. As the distance from the first permanent magnet 71 to the axis of the first rotating body 3 increases, the distance from the first permanent magnet 71 to the second permanent magnet 72 will decrease accordingly, thereby increasing the magnetic repulsion of the first permanent magnet 71 on the second permanent magnet 72, thereby driving the first rotating body 3 and the second rotating body 4 to move in a direction close to the third rotating body 5. In view of the fact that the displacement of the first rotating body 3 is less than the displacement of the second rotating body 4, the length of the radial oil delivery section 61 increases, while the length of the axial oil delivery section 62 decreases.

[0063] In addition, as the distance from the second rotating body 4 to the third rotating body 5 decreases, the inclination angle of the axial oil delivery section 62 also increases, which is also beneficial to reducing the amount of oil delivered by the axial oil delivery section 62 to the oil collecting groove 51 .

[0064] Preferably, the oil collecting groove 11 is connected to an oil collecting chamber 12, and an oil discharge passage 13 is connected between the oil collecting chamber 12 and the oil storage chamber. It is understandable that the lubricating oil thrown into the oil collecting groove 11 will flow into the oil collecting chamber 12, and then flow back to the oil storage chamber through the oil discharge passage 13. As the rotation speed of the transmission shaft 2 increases, when the oil intake of the oil collecting groove 11 is greater than the oil discharge of the oil discharge passage 13, the oil collecting chamber 12 can play the role of caching the lubricating oil, thereby reducing the oil level in the oil storage chamber.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electric drive axle lubricating oil quantity control system, comprising a housing, wherein an oil storage chamber for storing lubricating oil is formed in the housing, a horizontally extending transmission shaft is arranged above the oil storage chamber, and an oil delivery passage is formed in the transmission shaft, wherein: The inner wall of the housing is provided with an oil collecting groove located in the radial direction of the transmission shaft, and the outer side of the transmission shaft is sleeved with a first rotating body, a second rotating body and a third rotating body in sequence along the axial direction, and an end of the third rotating body close to the second rotating body is provided with an oil collecting groove connected with the oil delivery channel; The outer side of the transmission shaft is evenly distributed along the circumferential direction with a plurality of oil-slinging plates that pass through the second rotating body. The portion of the oil-slinging plates located between the first rotating body and the second rotating body is a radial oil-feeding section, and the portion of the oil-slinging plates located between the second rotating body and the third rotating body is an axial oil-feeding section. When the transmission shaft rotates, the radial oil delivery section can throw the lubricating oil into the oil collection tank, and the axial oil delivery section can throw the lubricating oil into the oil collection tank; The second rotating body is connected to an adjusting assembly, and the adjusting assembly can drive the second rotating body to move along its axial direction according to the rotation speed of the transmission shaft to change the length of the radial oil delivery section and the axial oil delivery section; The length of the radial oil delivery section is proportional to the rotation speed of the transmission shaft, and the length of the axial oil delivery section is inversely proportional to the rotation speed of the transmission shaft.

2. The electric drive axle lubricating oil quantity control system according to claim 1, characterized in that: The second rotating body is penetrated by an avoidance groove for the oil-slinging sheet to pass through and is slidably connected to the oil-slinging sheet.

3. The electric drive axle lubricating oil quantity control system according to claim 1 or 2, characterized in that: The oil-slinging plate is a rigid structure, and the oil-slinging plate extends spirally along the axial direction of the transmission shaft.

4. The electric drive axle lubricating oil quantity control system according to claim 1 or 2, characterized in that: The oil-slinging plate is an elastic structure, the head end and the tail end of the oil-slinging plate are connected to the transmission shaft as a whole, the radial oil-feeding section is horizontally arranged, and the axial oil-feeding section is inclined.

5. The electric drive axle lubricating oil quantity control system according to claim 4, characterized in that: The elastic restoring force of the oil-slinging sheet makes the first rotating body tend to move away from the third rotating body, and makes the second rotating body tend to move closer to the first rotating body, and the first rotating body is slidably connected to the transmission shaft.

6. The electric drive axle lubricating oil quantity control system according to claim 1, characterized in that: The adjustment component includes a first permanent magnet and a second permanent magnet that repel each other; The first permanent magnet is slidably connected to the first rotating body in the radial direction, an elastic member is connected between the first permanent magnet and the first rotating body, the elastic member makes the first permanent magnet tend to approach the axis of the first rotating body, and the distance from the first permanent magnet to the axis of the first rotating body is inversely proportional to the distance from the first permanent magnet to the second permanent magnet; The second permanent magnet is connected to the second rotating body as a whole.

7. The electric drive axle lubricating oil quantity control system according to claim 6, characterized in that: The adjustment component also includes a third permanent magnet that repel each other with the second permanent magnet, and the third permanent magnet is connected to the third rotating body as a whole.

8. The electric drive axle lubricating oil quantity control system according to claim 1, characterized in that: The oil collecting groove is connected with an oil collecting chamber, and an oil discharge passage is connected between the oil collecting chamber and the oil storage cavity.

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