A bearing lubrication structure, an electric drive axle and its vehicle

Abstract

This application provides a bearing lubrication structure, an electric drive axle, and a vehicle thereof, relating to the field of vehicle transmission technology. The structure includes: a driveshaft for rotating when the vehicle is coasting in neutral; a bearing mounted on the driveshaft; and an oil swivel ring fitted onto the driveshaft and rotating synchronously with it, the oil swivel ring being partially immersed in lubricating oil. The oil swivel ring has an oil swivel structure for splashing lubricating oil into the bearing to lubricate it during rotation. The oil swivel structure includes multiple first baffles; these first baffles are disposed on the surface of the oil swivel ring facing the bearing and are evenly distributed circumferentially along the oil swivel ring, each first baffle being arranged along the circumference of the oil swivel ring, with a first distance between adjacent first baffles. This structure improves the lubrication effect on the bearing when the vehicle is in neutral.

Description

Technical Field

[0001] This application relates to vehicle transmission technology, and more particularly to a bearing lubrication structure, an electric drive axle, and a vehicle thereof. Background Technology

[0002] An electric drive axle is an integrated unit consisting of a motor, reducer, steering gear, and brakes, used to drive the tires of a vehicle. Based on different drive methods and structural characteristics, electric drive axles can be divided into three types: front-wheel drive, rear-wheel drive, and four-wheel drive. Compared to traditional axles, electric drive axles use an electric motor drive and a multi-stage reduction gear structure.

[0003] In related technologies, splash lubrication is commonly used for lubricating bearings on electric drive axles. Splash lubrication relies on the high rotational speed of rotating parts sealed in the housing, such as reduction gears in a gearbox, to atomize lubricating oil into small droplets and carry them to the friction pairs for automatic lubrication. This lubrication method can only lubricate one side of the bearings when the rotating parts rotate synchronously with the drive shaft. However, when the vehicle is coasting in neutral, the drive shaft rotates while the reduction gears on the drive shaft do not rotate synchronously with it because they are not in gear. As a result, the bearings cannot be lubricated by splash lubrication, which can easily cause some parts to burn out and lead to electric drive axle failure. Summary of the Invention

[0004] This application provides a bearing lubrication structure, an electric drive axle, and a vehicle thereof, to solve the problem that the bearing cannot be lubricated when the vehicle is coasting in neutral.

[0005] In a first aspect, this application provides a bearing lubrication structure, comprising:

[0006] A drive shaft for rotating when the vehicle is coasting in neutral;

[0007] The bearing is mounted on the drive shaft;

[0008] An oil stirring ring is sleeved on the drive shaft and rotates synchronously with the drive shaft. The oil stirring ring is partially immersed in lubricating oil. The oil stirring ring is provided with an oil stirring structure, which is used to drive the lubricating oil to splash into the bearing to lubricate the bearing when the oil stirring ring rotates.

[0009] The oil stirring structure includes multiple first baffles;

[0010] Multiple first baffles are disposed on the surface of the oil stirring ring facing the bearing and are evenly distributed along the circumference of the oil stirring ring. Each first baffle is disposed along the circumferential direction of the oil stirring ring, and there is a first gap between adjacent first baffles.

[0011] By adopting the above technical solution, when the vehicle is coasting in neutral, the drive shaft rotates while the vehicle is coasting, causing the drive shaft to drive the oil swirl ring to rotate. Since the oil swirl ring is partially immersed in lubricating oil, the oil swirl structure on the oil swirl ring causes the lubricating oil to splash, thereby enabling the oil swirl structure to drive the lubricating oil to lubricate the bearing. This achieves bearing lubrication when the vehicle is coasting in neutral, preventing bearing damage and thus preventing the entire electric drive axle of the vehicle from malfunctioning.

[0012] In some embodiments, the oil stirring structure further includes a plurality of second baffles;

[0013] Multiple second baffles are disposed on the surface of the oil stirring ring facing the bearing and are evenly distributed along the circumference of the oil stirring ring. Each second baffle is disposed along the circumferential direction of the oil stirring ring, and there is a second spacing between adjacent second baffles. The second spacing and the first spacing are staggered along the radial direction of the oil stirring ring.

[0014] By adopting the above technical solution, when the drive shaft drives the oil churning ring to rotate, the oil churning ring drives the first baffle to pass through the lubricating oil. When the first baffle moves out of the lubricating oil, the first baffle can drive some lubricating oil to be located between the inner wall of the first baffle and the oil churning ring. When the oil churning ring rotates at high speed with the drive shaft, the oil churning ring carries up some lubricating oil, and some lubricating oil flows into the bearing as it falls. This allows the oil churning ring to drive the first baffle to achieve lubrication of the bearing. The use of multiple first baffles facilitates better lubrication when the oil churning ring rotates at high speed.

[0015] In some embodiments, the oil stirring structure further includes a plurality of second baffles;

[0016] Multiple second baffles are disposed on the surface of the oil stirring ring facing the bearing and are evenly distributed along the circumference of the oil stirring ring. Each second baffle is disposed along the circumferential direction of the oil stirring ring, and there is a second spacing between adjacent second baffles. The second spacing and the first spacing are staggered along the radial direction of the oil stirring ring.

[0017] By adopting the above technical solution, the combination of multiple second baffles and multiple first baffles further improves the effect of the first and second baffles in carrying lubricating oil when the oil churning ring rotates. This allows more lubricating oil to be carried down, thus achieving a lubricating effect on the bearing. The purpose of staggering the first and second spacings is to prevent the lubricating oil from flowing directly out of the oil churning ring along the first and second spacings when the oil churning ring rotates, which would cause the lubricating oil to fall directly back to the bottom of the housing. This increases the retention time of the lubricating oil on the first and second baffles, making it more conducive for this part of the lubricating oil to flow into the bearing location, thereby further improving the lubrication effect on the bearing.

[0018] In some embodiments, the length of the second spacing along the circumferential direction of the oil stirring ring is less than the length of the first baffle along the circumferential direction of the oil stirring ring.

[0019] By adopting the above technical solution, the first and second baffles are staggered along the diameter of the oil stirring ring, preventing gaps between the first and second baffles along the diameter of the oil stirring ring. As a result, when the first and second baffles carry up some lubricating oil, the lubricating oil falls directly back to the bottom lubricating oil position along the gap between the first and second baffles, thereby further improving the carrying effect of the first and second baffles carrying up some lubricating oil.

[0020] In some embodiments, the oil stirring structure includes a plurality of first oil stirring tanks;

[0021] Multiple first oil stirring grooves are evenly distributed along the circumference of the oil stirring ring. The first oil stirring grooves are arranged along the radial direction of the oil stirring ring, and the ends of the first oil stirring grooves away from the center of the oil stirring ring penetrate the oil stirring ring.

[0022] By adopting the above technical solution and setting the first oil stirring groove, when the oil stirring ring rotates with the drive shaft, the oil stirring ring drives the first oil stirring groove to rotate at high speed, so that the first oil stirring groove drives the lubricating oil to achieve splash lubrication. The setting of the first oil stirring groove has a simple structure, is easy to manufacture and process, and improves the lubrication effect on the bearing.

[0023] In some embodiments, the surfaces of the first oil stirring groove facing and away from the bearing are both configured as a first opening surface that penetrates the oil stirring ring.

[0024] By adopting the above technical solution, the surface of the first oil stirring groove facing and away from the bearing is set as the first opening surface, which further facilitates the processing of the oil stirring ring with the first oil stirring groove. When the oil stirring ring drives the first oil stirring groove to rotate, the side wall of the first oil stirring groove can better carry up some lubricating oil, thereby further improving the splash lubrication effect of the oil stirring ring.

[0025] In some embodiments, the oil stirring structure includes a plurality of second oil stirring tanks;

[0026] Multiple second oil stirring grooves are evenly distributed along the circumference of the oil stirring ring. The straight line along the length direction of the second oil stirring groove is f. The line connecting the end of the second oil stirring groove near the center of the oil stirring ring and the center of the oil stirring ring is g. The acute angle formed between f and g is z, z>0°. The end of the second oil stirring groove away from the center of the oil stirring ring passes through the oil stirring ring.

[0027] By adopting the above technical solution, z is greater than 0°, so that the second oil stirring groove is not set along the radial direction of the oil stirring ring. This makes the second oil stirring groove inclined on the oil stirring ring. When the oil stirring ring drives the rotating rods of multiple second oil stirring grooves to pass through the lubricating oil, the inclined inner wall of the second oil stirring groove can further carry up some lubricating oil, thereby further enabling multiple second oil stirring grooves to achieve the effect of splash lubrication, thus improving the lubrication effect on the bearing.

[0028] In some embodiments, the surface of the second oil stirring groove facing the bearing is configured as a second open surface, and the surface of the second oil stirring groove away from the bearing is configured as a closed surface.

[0029] By adopting the above technical solution, the surface of the second oil stirring groove facing the bearing is set as the second open surface, while the surface of the second oil stirring groove away from the bearing is set as the closed surface. This makes the second oil stirring groove have side walls and bottom walls, which facilitates the processing of the oil stirring ring with the first oil stirring groove. When the oil stirring ring drives the second oil stirring groove to rotate, the bottom wall and side walls of the second oil stirring groove can better carry up some lubricating oil, thereby further improving the splash lubrication effect of the oil stirring ring.

[0030] In some embodiments, the bearing includes a housing, on which a protruding edge is provided along the circumference of the housing, the protruding edge extending toward the location of the oil churning ring, and a drainage groove is provided on the surface of the protruding edge facing the oil churning ring for guiding the lubricating oil thrown out by the oil churning ring into the interior of the bearing.

[0031] By adopting the above technical solution, when the oil stirring ring rotates, the oil thrown up by the oil stirring structure can be directly thrown onto the protrusion. The lubricating oil can be guided along the drainage groove on the protrusion to the position of the bearing balls, preventing the lubricating oil thrown to the upper part by the oil stirring ring from falling directly into the lubricating oil in the lower part, thereby achieving precise lubrication of the bearing and further improving the lubrication effect of the bearing.

[0032] Secondly, this application provides an electric drive bridge, including the aforementioned bearing lubrication structure, wherein the electric drive bridge includes a bridge body and the drive shaft is disposed on the bridge body.

[0033] By adopting the above technical solution, the drive shaft is mounted on the axle body. When the electric drive axle is used in a car, the drive shaft rotates while the vehicle is coasting in neutral. This causes the drive shaft to drive the oil swirl ring to rotate. Since the oil swirl ring is partially immersed in lubricating oil, the oil swirl structure on the oil swirl ring causes the lubricating oil to splash. This allows the oil swirl structure to drive the lubricating oil to lubricate the bearings, thus achieving bearing lubrication while the vehicle is coasting in neutral. This prevents bearing damage and thus prevents the entire electric drive axle from malfunctioning.

[0034] Thirdly, this application provides a vehicle including the aforementioned bearing lubrication structure, the vehicle including a vehicle body, and the drive shaft disposed on the vehicle body.

[0035] By adopting the above technical solution, the drive shaft with an oil swivel ring is installed on the vehicle body. When the vehicle is coasting in neutral, the drive shaft can drive the oil swivel ring to rotate. Since the oil swivel ring is partially immersed in lubricating oil, the oil swivel structure on the oil swivel ring causes the lubricating oil to splash, thereby enabling the oil swivel structure to drive the lubricating oil to lubricate the bearing. This achieves bearing lubrication when the vehicle is coasting in neutral, preventing bearing damage and thus preventing the entire electric drive axle of the vehicle from malfunctioning. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a partial structural schematic diagram of the bearing lubrication structure according to Embodiment 1 of this application;

[0038] Figure 2 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 1 of this application;

[0039] Figure 3 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 1 of this application;

[0040] Figure 4 This is a schematic diagram of the bearing housing and protruding edge of the bearing lubrication structure in Embodiment 1 of this application;

[0041] Figure 5 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 2 of this application;

[0042] Figure 6 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 2 of this application;

[0043] Figure 7 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 3 of this application;

[0044] Figure 8 This is a schematic diagram of the oil stirring ring in the bearing lubrication structure of Embodiment 3 of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Drive shaft; 110. Bearing; 111. Housing;

[0047] 120. Oil stirring ring;

[0048] 130. Step groove;

[0049] 140. Reduction gear;

[0050] 150. Wear-resistant ring;

[0051] 160. First retaining edge; 161. First spacing; 162. Second retaining edge; 163. Second spacing;

[0052] 170. Convex edge; 171. Drainage groove; 172. First tank body; 173. Second tank body; 174. Deep part; 175. Shallow part;

[0053] 180. First oil stirring tank; 181. First opening surface; 182. First semi-circular arc surface;

[0054] 190. Second oil stirring tank; 191. Second semi-circular arc surface; 192. Second opening surface; 193. Closed surface. Detailed implementation manners

[0055] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are merely examples of the devices and methods consistent with some aspects of the present application as detailed in the appended claims, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0056] First, the relevant concepts or terms involved in the present application are explained:

[0057] Ablation: The phenomenon that the surface material of a moving object with extremely high speed melts, disappears and deform under the action of hot gas.

[0058] Splash lubrication: Splash lubrication is achieved when the rotating speed of the rotating parts sealed in the machine case is relatively high (5m / s < v < 12m / s), the lubricating oil is splashed and atomized into small drops by the rotating parts and brought to the friction pair to form automatic lubrication, or it is first concentrated in the oil collector and then flows into the lubrication part through the designed oil grooves. [[ID=​​​​Electric drive axle: refers to an integrated unit consisting of a motor, reducer, steering gear, and brakes, used to drive the tires of a vehicle.

[0061] A gearbox, also known as a transmission, is a mechanism used to change the speed and torque from the engine. It can change the transmission ratio between the output shaft and the input shaft in a fixed or progressively increasing manner. A gearbox consists of a transmission mechanism and a control mechanism; some cars also have a power take-off (PTO) mechanism. Most transmission mechanisms use ordinary gear drives, while some use planetary gear drives. Ordinary gear transmission mechanisms typically use sliding gears and synchronizers.

[0062] Bearings: Their main function is to support rotating mechanical parts, reduce the coefficient of friction during their movement, and ensure their rotational accuracy. Examples include combination bearings of needle rollers and thrust cylindrical rollers, combination bearings of needle rollers and thrust ball bearings, and combination bearings of needle rollers and angular contact ball bearings.

[0063] In related technologies, more and more people are joining the ranks of car buyers. For some families, the annual vehicle maintenance cost is quite high. As a result, many users try various ways to save fuel. Some users use the method of coasting the vehicle in neutral when going downhill to save fuel. However, when the vehicle coasts in neutral for a long time, it will cause serious wear on the gears and bearings in the transmission.

[0064] The gearbox is mainly composed of a main shaft and a countershaft. Each shaft has many gears, and there are bearings at both ends of the shaft. Since the speed of each gear is different when the vehicle is running, the size of the gears is different. When the gearbox is in use, some lubricating oil is added to the gearbox. The gearbox is not filled with lubricating oil. This is to prevent foam from being generated when the gears are rotating. Too much foam will not only affect the lubrication effect, but also cause oil seal leakage. Too much or too little lubricating oil will reduce the efficiency of mechanical transmission. Therefore, less than half of the lubricating oil is added to each gearbox.

[0065] When a car is in gear, the gears inside the transmission rotate synchronously with the shaft. As the gears rotate, they stir up lubricating oil from below, causing it to splash and thus providing lubrication. When the gears rotate at high speed, the transmission is like a downpour. However, when the vehicle is coasting in neutral, the gears are not rotating, only the shaft is rotating. When the shaft rotates, since it is basically above the lubricating oil surface, it can only stir a very small amount of lubricating oil, or even not stir enough to create splashes. The shaft and bearings are difficult to be effectively lubricated. Without lubrication, the shaft and bearings will overheat, and over time, the transmission can easily be damaged due to severe wear.

[0066] To address the aforementioned technical problems, this application provides a bearing lubrication structure. By installing an oil churning ring on the drive shaft and located on one side of the bearing, when the oil churning ring rotates, it drives the oil churning structure to stir up the lubricating oil inside the gearbox. The stirred-up lubricating oil produces a splash lubrication effect, thereby enabling the oil churning ring to lubricate the bearing through the oil churning structure, solving the problem of gearbox damage when the vehicle is coasting in neutral.

[0067] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0068] Example 1:

[0069] like Figure 1 As shown, this application provides a bearing lubrication structure, including a drive shaft 100, a bearing 110, and an oil stirring ring 120. The drive shaft 100 is used to rotate when the vehicle is coasting in neutral. In this embodiment, the drive shaft 100 is the main shaft or auxiliary shaft in the gearbox. When the vehicle is coasting in neutral, the drive shaft 100 is in a rotating state, and when the vehicle is in gear, the drive shaft 100 is also in a rotating state. The bearing 110 is disposed at one end of the drive shaft 100. The bearing 110 includes a seat 111, which is a part used to fix the position of the bearing 110. Typically, the seat 111 is fixed to the housing of the gearbox, so that the position of the bearing 110 is fixed, and the drive shaft 100 can rotate within the inner ring of the bearing 110. A plurality of balls or needle rollers and other components are disposed between the seat 111 of the bearing 110 and the inner ring of the bearing 110. The arrangement of the balls or needle rollers allows the inner ring of the bearing 110 to rotate within the seat 111.

[0070] like Figure 1 As shown, the oil stirring ring 120 is sleeved on the drive shaft 100 and rotates synchronously with the drive shaft 100. In this embodiment, the oil stirring ring 120 is circularly arranged, and the circular oil stirring ring 120 and the drive shaft 100 are interference-fitted. The drive shaft 100 has a stepped groove 130 in the circumferential direction. The end of the stepped groove 130 near the bearing 110 passes through the drive shaft 100. The oil stirring ring 120 abuts against the bottom wall of the stepped groove 130. When the seat 111 of the bearing 110 is fixed, the inner ring end face of the bearing 110 abuts against the oil stirring ring 120, so that the oil stirring ring 120 is pressed against the bottom wall of the stepped groove 130, so that the running state between the oil stirring ring 120 and the drive shaft 100 is consistent.

[0071] like Figure 1As shown, in this embodiment, a reduction gear 140 is also sleeved on the drive shaft 100. The reduction gear 140 and the drive shaft 100 are in a clearance fit. When the vehicle is in gear, the reduction gear 140 on the drive shaft 100 is rotating. When the vehicle is in neutral and coasting, the reduction gear 140 on the drive shaft 100 is stationary. The oil swirl ring 120 is located between the reduction gear 140 and the bearing 110. To prevent the oil swirl ring 120 from rubbing against the reduction gear 140 during rotation, causing wear on both the reduction gear 140 and the oil swirl ring 120, A wear-resistant component is provided on the drive shaft 100 and between the oil churning ring 120 and the reduction gear 140. In this embodiment, the wear-resistant component includes a wear-resistant ring 150. The wear-resistant ring 150 and the drive shaft 100 are fitted with a clearance. There are also clearances between the wear-resistant ring 150 and the reduction gear 140 and the oil churning ring 120. The wear-resistant ring 150 is made of 20CrMnTi, i.e., carburized steel. The wear-resistant ring 150 made of carburized steel has high low-temperature impact toughness and good machinability after normalizing. It is a component used to manufacture parts that withstand high speed, medium or heavy loads, impacts and friction.

[0072] Combination Figure 1 and Figure 2 The oil churning ring 120 is equipped with an oil churning structure, which is used to splash lubricating oil into the bearing 110 to lubricate the bearing 110 when the oil churning ring 120 rotates. In this embodiment, the drive shaft 100, reduction gear 140, wear ring 150, oil churning ring 120, and bearing 110 are all located inside the gearbox housing. The oil churning ring 120 is partially immersed in the lubricating oil in the gearbox housing, and the reduction gear 140 is also partially immersed in the lubricating oil in the gearbox housing. When the vehicle is in gear, the reduction gear 140 is rotating. The reduction gear 140 can cause the lubricating oil in the gearbox housing to splash, so that the reduction gear 140 drives the lubricating oil to achieve the lubrication effect. At this time, the oil churning ring 120 rotates synchronously with the drive shaft 100, so that the oil churning ring 120 drives the oil churning structure to stir up the lubricating oil to lubricate the needle rollers of the bearing 110, further improving the lubrication effect of the bearing 110.

[0073] Combination Figure 1 and Figure 2The oil-stirring structure includes multiple first baffles 160. In this embodiment, four first baffles 160 are provided, which are disposed on the surface of the oil-stirring ring 120 facing the bearing 110 and evenly distributed along the circumference of the oil-stirring ring 120. Each first baffle 160 is arranged along the circumferential direction of the oil-stirring ring 120. Specifically, the first baffle 160 is generally arc-shaped, and the axis of the arc-shaped first baffle 160 coincides with the axis of the oil-stirring ring 120. There is a first spacing 161 between adjacent first baffles 160. The first baffle 160 coincides with the edge of the oil-stirring ring 120. The cross-section of the first baffle 160 is set as a rectangle. The rectangular first baffle 160 facilitates further stirring of the lubricating oil when the oil-stirring ring 120 rotates, thereby further improving the lubrication effect on the bearing 110. In other embodiments, the cross-section of the first baffle 160 can be set as other shapes, such as an isosceles trapezoid with the width gradually decreasing towards the oil-stirring ring 120, which can also achieve a better oil-stirring effect.

[0074] Combination Figure 2 and Figure 3 The oil stirring structure also includes multiple second baffles 162; in this embodiment, four second baffles 162 are provided, which are disposed on the surface of the oil stirring ring 120 facing the bearing 110 and evenly distributed along the circumference of the oil stirring ring 120. Each second baffle 162 is arranged along the circumferential direction of the oil stirring ring 120. Specifically, the second baffle 162 is generally arc-shaped, and the axis of the arc-shaped second baffle 162 coincides with the axis of the oil stirring ring 120; there is a second spacing 163 between adjacent second baffles 162. The second spacing 163 and the first spacing 161 are staggered along the radial direction of the stirring ring 120. Specifically, the second spacing 163 is located relative to the first baffle 160, and the first spacing 161 is located relative to the second baffle 162. In this embodiment, the second baffle 162 is located on the stirring ring 120 near the center of the stirring ring 120. Specifically, the distance between the middle part of the second baffle 162 and the center of the stirring ring 120 is smaller than the distance between the middle part of the first baffle 160 and the center of the stirring ring 120.

[0075] In other embodiments, the cross-section of the second baffle 162 can be set to other shapes, such as an isosceles trapezoid with a width that gradually decreases toward the stirring ring 120, which can also achieve a better stirring effect. In addition, the overall shape of the second baffle 162 can also be adjusted. For example, the second baffle 162 can be set as a "V" shape, with the concave part of the "V" shaped second baffle 162 facing toward the center of the stirring ring 120, so that the arc-shaped first baffle 160 and the "V" shaped second baffle 162 can achieve a better stirring effect.

[0076] Combination Figure 2 and Figure 3 To prevent the lubricating oil from being directly thrown out along the gap between the first baffle 160 and the second baffle 162 when the oil stirring ring 120 rotates, the length of the second gap 163 along the circumference of the oil stirring ring 120 is less than the length of the first baffle 160 along the circumference of the oil stirring ring 120. In this embodiment, the length of the first baffle 160 along the circumference of the oil stirring ring 120 is a, and the length of the second gap 163 along the circumference of the oil stirring ring 120 is b, where a > b.

[0077] Combination Figure 2 and Figure 3 In this embodiment, the height of the first baffle 160 and the second baffle 162 along the direction away from the plane where the oil stirring ring 120 is located is h, the thickness of the oil stirring ring 120 is H, and h≤H; the length of the first spacing 161 along the circumference of the oil stirring ring 120 is c, the length of the second baffle 162 along the circumference of the oil stirring ring 120 is d, (ac) / 2=e, ∠e>0°, ∠e is the angle of the central angle with e as the arc side, d>(c+2e), a>(b+2e).

[0078] When the drive shaft 100 drives the oil stirring ring 120 to rotate, the oil stirring ring 120 drives the first flange 160 and the second flange 162 to rotate, so that the first flange 160 and the second flange 162 can carry the lubricating oil in the gearbox housing, thereby enabling the lubricating oil to further lubricate the bearing 110.

[0079] Combination Figure 1 and Figure 4 To further enhance the lubrication effect on the bearing 110 when the first and second retaining edges 160 and 162 stir up the lubricating oil, a protruding edge 170 is provided on the seat 111 along the circumference of the seat 111. The protruding edge 170 extends toward the position of the oil stirring ring 120. In this embodiment, the protruding edge 170 is semi-circular in shape and is located above the oil stirring ring 120. The height S1 of the protruding edge 170 along the axial direction of the seat 111 is greater than the maximum thickness S2 of the oil stirring ring 120. To improve the installation effect between the oil stirring ring 120 and the drive shaft 100, the inner ring thickness of the oil stirring ring 120 is greater than the thickness at the positions of the first and second retaining edges 160 and 162. Therefore, the maximum thickness of the oil stirring ring 120 refers to the inner ring thickness of the oil stirring ring 120. The inner wall of the protruding edge 170 is on the same plane as the inner wall of the seat 111. In other embodiments, the protruding edge 170 can also be arranged horizontally above the oil stirring ring 120.

[0080] Combination Figure 1 and Figure 4To guide the lubricating oil that the churning ring 120 throws onto the protruding edge 170 into the bearing 110, a drainage groove 171 is provided on the surface of the protruding edge 170 facing the churning ring 120 to guide the lubricating oil thrown out by the churning ring 120 into the bearing 110. In this embodiment, the drainage groove 171 includes a first groove 172 and a second groove 173. The first groove 172 is formed on the surface of the protruding edge 170 away from the seat 111. The first groove 172 is provided through both ends of the protruding edge 170 in the circumferential direction. The surface of the first groove 172 facing the axis of the churning ring 120 is provided through the protruding edge 170. The depth of body 111 in the radial direction gradually decreases from one end to the other. The deeper end of the first groove 172 is the deep part 174, and the shallower end is the shallow part 175. The second groove 173 is formed on the bottom wall of the first groove 172. The opening of the second groove 173 through the bottom wall of the first groove 172 is located near the shallow part 175. The second groove 173 also extends along the circumferential direction of the convex edge 170. The two ends of the second groove 173 through the convex edge 170 in the circumferential direction are set. The depth of the second groove 173 gradually decreases from the shallow part 175 to the deep part 174.

[0081] When the oil stirring ring 120 drives the first baffle 160 and the second baffle 162 to stir up the lubricating oil, the lubricating oil is stirred into the first groove 172 and the second groove 173 of the convex edge 170. The lubricating oil in the first groove 172 flows along the first groove 172 to the second groove 173 or directly to the inner wall of the seat 111. The lubricating oil in the second groove 173 flows directly along the second groove 173 to the inner wall of the seat 111. Thus, the lubricating oil flows to the inner wall of the seat 111 to lubricate the needle rollers in the bearing 110, further improving the lubrication effect of the lubricating oil on the bearing 110.

[0082] Example 2:

[0083] The difference between this embodiment and Embodiment 1 is that: Figure 5 As shown, the oil stirring structure includes a plurality of first oil stirring grooves 180; in this embodiment, eight first oil stirring grooves 180 are provided, and the eight first oil stirring grooves 180 are evenly distributed along the circumference of the oil stirring ring 120. The first oil stirring grooves 180 are arranged along the radial direction of the oil stirring ring 120. The end of the first oil stirring groove 180 away from the center of the oil stirring ring 120 is provided through the oil stirring ring 120. The surfaces of the first oil stirring groove 180 facing and away from the bearing 110 are both set as first opening surfaces 181 that penetrate the oil stirring ring 120.

[0084] Combination Figure 5 and Figure 6In this embodiment, the surface of the first oil stirring groove 180 near the center of the oil stirring ring 120 is set as a first semi-circular arc surface 182 with the width of the first oil stirring groove 180 as the diameter. The opening width of the first oil stirring groove 180 away from the center of the oil stirring ring 120 is the same as the diameter of the semi-circular arc surface. The total number of the first oil stirring grooves 180 is n, the diameter of the oil stirring ring 120 is Φ, and the opening width of the first oil stirring groove 180 away from the center of the oil stirring ring 120 is d1, d1≈(πΦ) / (4n), π≈3.14. In other embodiments, the width of the first oil stirring groove 180 can be gradually increased or decreased in the direction away from the center of the oil stirring ring 120, which can also stir up the lubricating oil at the bottom of the gearbox housing.

[0085] When the drive shaft 100 drives the first oil stirring groove 180 to rotate, the inner wall of the first oil stirring groove 180 can stir the lubricating oil at the bottom of the gearbox housing, causing multiple first oil stirring grooves 180 to splash the lubricating oil at the bottom of the gearbox housing. This causes the oil stirring ring 120 to drive multiple first oil stirring grooves 180 to achieve splash lubrication of the bearing 110. Combined with the rotation of the reduction gear 140 on the drive shaft 100 for splash lubrication, the lubrication effect on the bearing 110 is further improved.

[0086] Example 3:

[0087] The difference between this embodiment and Embodiment 1 is that: Figure 7 As shown, the oil stirring structure includes multiple second oil stirring grooves 190; in this embodiment, eight second oil stirring grooves 190 are provided, and the eight second oil stirring grooves 190 are evenly distributed along the circumference of the oil stirring ring 120; the cross-section of the second oil stirring groove 190 is set as a semi-circular arc shape, the end of the second oil stirring groove 190 near the center of the oil stirring ring 120 is set as a second semi-circular arc surface 191 with the opening width of the first oil stirring groove 180 as the diameter, the surface of the second oil stirring groove 190 facing the bearing 110 is set as a second opening surface 192, the surface of the second oil stirring groove 190 away from the bearing 110 is set as a closed surface 193, and the end of the second oil stirring groove 190 away from the center of the oil stirring ring 120 is provided through the oil stirring ring 120.

[0088] Combination Figure 7 and Figure 8The straight line along the length of the second oil stirring groove 190 is f, the line connecting the end of the second oil stirring groove 190 near the center of the oil stirring ring 120 and the center of the oil stirring ring 120 is g, and the acute angle formed between f and g is z, z>0°; the width of the opening of the second oil stirring groove 190 is d2, the depth of the deepest part of the semi-circular second oil stirring groove 190 is d3, d2=2d3, the surface of the oil stirring ring 120 near the bearing 110 and along the edge of the oil stirring ring 120 is chamfered, and the thickness of the oil stirring ring 120 with the chamfered is d4, d3≤d4 / 2; in this embodiment, the end of the second oil stirring groove 190 near the center of the oil stirring ring 120 is biased towards the positive direction of rotation of the oil stirring ring 120 (see Figure 7 The x-direction is the rotation direction of the oil stirring ring 120 when the vehicle is coasting in neutral. The above scheme can be used to drive the lubricating oil in the second oil stirring groove 190 to be further transported towards the bearing. In other embodiments, the width of the cross-section of the second oil stirring groove 190 can be gradually reduced or increased along the axial direction of the oil stirring ring 120, so that the second oil stirring groove 190 can have a better oil stirring effect.

[0089] When the drive shaft 100 drives the multiple second oil stirring grooves 190 on the oil stirring ring 120 to rotate, the second oil stirring grooves 190 are inclinedly opened on the oil stirring ring 120, causing the lubricating oil at the bottom of the gearbox housing to be stirred up. At this time, the lubricating oil in the inclined second oil stirring grooves 190 forms a guiding effect, making it easier for the lubricating oil to enter the bearing 110 through the second oil stirring grooves 190, thereby improving the lubrication effect on the bearing 110.

[0090] An electric drive axle includes a bearing lubrication structure according to any of the above embodiments. The electric drive axle includes an axle body and a drive shaft 100 disposed on the axle body. In this embodiment, the drive shaft 100 is a shaft inside the gearbox housing of the axle body. In other embodiments, the drive shaft 100 can also be a shaft at other locations on the axle body. As long as there is a need to lubricate the bearing 110 or other components on the axle body of the electric drive axle, the structure of the oil stirring ring 120 of this application can be used to achieve lubrication of the bearing 110 or other components. In this embodiment, an electric drive axle is used, which is the bottom assembly of an electric vehicle. In other embodiments, the electric drive axle can also be replaced with the bottom assembly of a fuel vehicle, or the bearing 110 lubrication structure of this application can be applied to other equipment, such as large equipment used in nuclear power plants or other locations that require lubrication.

[0091] A vehicle includes the bearing lubrication structure of any of the above embodiments. The vehicle includes a vehicle body and a drive shaft 100 is disposed on the vehicle body. In this embodiment, the drive shaft 100 is disposed in the gearbox housing of the electric drive axle of the vehicle body. In other embodiments, the drive shaft 100 may be disposed in other positions of the vehicle body.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bearing lubrication structure characterized by, The transmission shaft (100) is used for rotating during vehicle neutral coasting. The bearing (110) is arranged on the transmission shaft (100). The oil stirring ring (120) is sleeved on the transmission shaft (100) and rotates synchronously with the transmission shaft (100), the oil stirring ring (120) is partially immersed in lubricating oil, the oil stirring structure is arranged on the oil stirring ring (120), and the oil stirring structure is used for splashing lubricating oil into the bearing (110) to lubricate the bearing (110) when the oil stirring ring (120) rotates. The oil stirring structure comprises a plurality of first retaining edges (160). The plurality of first retaining edges (160) are arranged on a surface of the oil stirring ring (120) facing the bearing (110) and are uniformly distributed in the circumferential direction of the oil stirring ring (120), each first retaining edge (160) is arranged in the circumferential direction of the oil stirring ring (120), and the first retaining edges (160) are arranged in the circumferential direction of the oil stirring ring (120). The bearing (110) comprises a seat body (111), a convex edge (170) is arranged on the seat body (111) in the circumferential direction of the seat body (111), the convex edge (170) extends towards the position of the oil stirring ring (120), and a drainage groove (171) is arranged on the surface of the convex edge (170) facing the oil stirring ring (120) and is used for draining the splashed lubricating oil of the oil stirring ring (120) to the inside of the bearing (110). The oil stirring structure further comprises a plurality of second retaining edges (162).

2. The bearing lubrication structure according to claim 1, characterized by The plurality of second retaining edges (162) are arranged on the surface of the oil stirring ring (120) facing the bearing (110) and are uniformly distributed in the circumferential direction of the oil stirring ring (120), each second retaining edge (162) is arranged in the circumferential direction of the oil stirring ring (120), and the second retaining edges (162) are arranged in the circumferential direction of the oil stirring ring (120). The second retaining edges (162) are arranged in the radial direction of the oil stirring ring (120) in a staggered manner between the second intervals (163) and the first intervals (161).

3. The bearing lubrication structure according to claim 2, characterized in that, The length of the second interval (163) in the circumferential direction of the oil stirring ring (120) is less than the length of the first retaining edge (160) in the circumferential direction of the oil stirring ring (120).

4. The bearing lubrication structure of claim 1, wherein The oil stirring structure comprises a plurality of first oil stirring grooves (180). The plurality of first oil stirring grooves (180) are uniformly distributed in the circumferential direction of the oil stirring ring (120), the first oil stirring grooves (180) are arranged in the radial direction of the oil stirring ring (120), and the end portion of the first oil stirring grooves (180) away from the center of the oil stirring ring (120) penetrates the oil stirring ring (120).

5. The bearing lubrication structure according to claim 4, characterized by The surface of the first oil stirring groove (180) facing and away from the bearing (110) is arranged as a first opening surface (181) penetrating the oil stirring ring (120).

6. The bearing lubrication structure of claim 1, wherein The oil stirring structure comprises a plurality of second oil stirring grooves (190). A plurality of the second oil stirring grooves (190) are uniformly distributed along the circumference of the oil stirring ring (120), a straight line in which the second oil stirring grooves (190) are located is f, a line connecting the end of the second oil stirring groove (190) close to the center of the oil stirring ring (120) and the center of the oil stirring ring (120) is g, the acute angle formed between f and g is z, z>0°, and the end of the second oil stirring groove (190) away from the center of the oil stirring ring (120) penetrates the oil stirring ring (120).

7. The bearing lubrication arrangement of claim 6, wherein, The surface of the second oil stirring groove (190) facing the bearing (110) is provided as a second opening surface (192), and the surface of the second oil stirring groove (190) away from the bearing (110) is provided as a closed surface (193).

8. An electric drive axle, characterized in that The electric drive axle comprises an axle body, and the transmission shaft (100) is arranged on the axle body.

9. A vehicle characterized by comprising: The vehicle comprises a vehicle body, and the transmission shaft (100) is arranged on the vehicle body.

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