Lubricated guide type new energy vehicle transmission gear

Abstract

This invention discloses a lubricated, flow-guided gearbox for new energy vehicles, relating to the field of gearbox technology. It includes a gearbox body with a rotatable connecting shaft inside, and a gear body mounted on the connecting shaft. Power transmission is achieved through the meshing of gear bodies of varying diameters. A lubrication mechanism is internally installed within each gear body, continuously lubricating the meshing surfaces of the gear bodies by discharging stored lubricant. In this lubricated, flow-guided gearbox for new energy vehicles, when the overall temperature rises due to prolonged meshing and friction of the gear bodies, the viscosity of the lubricant decreases. At this time, the deformation baffle expands due to heat, obstructing and turbulent the flow of the lubricant, slowing its outflow speed, and preventing the reduced viscosity lubricant from splashing directly off the gear meshing surfaces under strong centrifugal force. This effectively improves the utilization rate of the lubricant under high-temperature operating conditions, reduces lubricant waste, and ensures the lubrication effect on the gear meshing surfaces under high-temperature and high-speed operating conditions.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, specifically to lubricated guide-type gearbox gears for new energy vehicles. Background Technology

[0002] Gearbox gears are important components in the power transmission process of new energy vehicles. Through the meshing of gears with different diameters, the transmission speed and torque of power are changed to adapt to the power requirements of new energy vehicles in different driving states. However, during the long-term meshing operation, the meshing tooth surfaces will experience severe friction, which will increase transmission energy consumption and easily cause wear on the gear tooth surfaces. Therefore, it is necessary to use lubricant to continuously lubricate the meshing tooth surfaces.

[0003] Existing technology 1 (Chinese patent with announcement number CN218598758U and announcement date of 2023-03-10) discloses a self-lubricating gearbox gear, relating to the field of gearbox gear technology. It includes a gearbox gear body, which comprises a main body and an internal lubrication mechanism. The lubrication mechanism includes a cavity located inside the main body. An annular stop block is installed inside the cavity. Several oil passages are formed on the side of the annular stop block, and partitions are fixedly installed inside each oil passage. A valve cover is movably inserted at the center of each partition, and valve ports are formed on both sides of each partition. A limit block is installed at the bottom of each valve cover, and a spring is fitted onto the upper end of the limit block. One end of the spring abuts against one side of the partition. Several teeth are provided on the outer side of the main body, and oil outlet holes are formed between these teeth. The interior of each oil outlet hole has serrations on both sides, and these serrations are staggered. This design effectively improves the self-lubrication of the gearbox gear and has high practical value.

[0004] There is also a prior art (Chinese patent CN216279271U, published on 2022-04-12) of a self-lubricating gearbox gear, belonging to the field of gear technology. It solves the problem of damage caused by poor lubrication of existing gearbox gears. It includes a gear body with external teeth, a shaft hole in the center of the gear body, annular grooves on both ends of the gear body, an oil storage annular cavity for storing lubricating oil inside the gear body, several oil injection holes at the bottom of the annular groove on one end face of the gear body, several oil passages communicating with the tooth root of the external teeth on the inner peripheral wall of the oil storage annular cavity, and an oil outlet component for unidirectional flow of lubricating oil in the oil passage at one end of the external teeth. The oil outlet component consists of a limiting member, a return spring, and a protrusion for limiting the installation of the return spring. It has the advantages of self-lubrication, reduced damage, and increased service life.

[0005] Most existing gearbox gear lubrication methods involve directly injecting lubricant into the gearbox housing. Lubrication is achieved by the lubricant carried by the gears during rotation contacting the meshing surfaces. However, the lubricant is unevenly distributed and splashed within the housing. During high-speed rotation, a large amount of lubricant is easily thrown off the tooth surfaces, making it difficult to maintain continuous lubrication at the meshing positions. This results in low lubricant utilization. Furthermore, as the gears heat up during prolonged operation, the viscosity of the lubricant decreases, further reducing its adhesion and making it more prone to insufficient lubrication and abnormal wear on the tooth surfaces, thus affecting the service life of the gears.

[0006] Therefore, we proposed a lubricated guide-type gearbox gear for new energy vehicles to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a lubricated guide type gearbox gear for new energy vehicles, in order to solve the problems mentioned in the background art, such as uneven distribution of lubricant in the gearbox, large amounts of lubricant being easily thrown off the tooth surface during high-speed rotation, making it difficult to maintain continuous lubrication at the meshing position, resulting in low lubricant utilization. At the same time, when the gears work for a long time and heat up, the viscosity of the lubricant will decrease accordingly, further reducing the adhesion of the lubricant and making it more prone to insufficient lubrication and abnormal wear of the tooth surface, thus affecting the service life of the gears.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a lubricated and flow-guided gearbox gear for new energy vehicles, comprising a gearbox body, wherein a connecting shaft is rotatably arranged inside the gearbox body, and a gear body is arranged on the connecting shaft. The gearbox body transmits power through the meshing of gear bodies of different diameters. A lubrication mechanism is arranged inside the gear body, which continuously lubricates the meshing surfaces of the gear bodies by discharging the lubricating fluid stored inside. A flow-guided mechanism is arranged outside the lubrication mechanism, which guides the flow of lubricating fluid when the temperature of the gear body meshes and rotates, preventing the lubricating fluid from splashing outward due to the decrease in viscosity caused by high temperature, through the deformation of the deformation baffles it contains.

[0009] Preferably, the lubrication mechanism includes an oil reservoir, which is fixedly connected inside the gear body, and an oil supply hole is provided through the oil reservoir and the gear body to inject lubricant into the oil reservoir.

[0010] Preferably, the oil reservoir is provided with an oil guide box in a circular array on its side, and the oil guide box is connected to the inside of the oil reservoir. The outer end of the oil guide box is connected to an oil drain nozzle, which extends to the meshing tooth surface of the gear body. Under the action of centrifugal force, the lubricant flows from the oil reservoir into the oil guide box, and then flows out through the oil drain nozzle to the meshing position of the gear body to complete the lubrication of the meshing tooth surface.

[0011] Preferably, the oil drain nozzle is configured in a frustum shape, and the diameter of the side of the oil drain nozzle facing the oil guide box is larger than the diameter of the other side of the oil drain nozzle. The frustum shape increases the oil pressure at the outlet of the oil drain nozzle, accelerates the flow rate of lubricating fluid, and reduces the amount of lubricating fluid residue adhering inside the oil drain nozzle.

[0012] Preferably, the oil storage box is internally fixedly connected with two sets of sealing gaskets, and the sealing gaskets are made of deformable rubber material, and the sealing gaskets are provided with oil drain grooves.

[0013] Preferably, the oil drain groove is arranged in a cross shape, and the oil drain groove corresponds one-to-one with the position of the oil guide box. When the lubricant flows from the oil storage box into the oil guide box, it needs to pass through the oil drain groove on the sealing gasket ring. When the rotation speed of the gear body increases, the centrifugal force will squeeze the deformable sealing gasket ring, which will increase the opening range of the oil drain groove, thereby increasing the amount of oil discharged per unit time, and adapting to the higher lubrication requirements when the gear body is working at high speed.

[0014] Preferably, the flow guiding mechanism includes a folding plate, which is fixedly connected to the inner wall side of the oil guide box. The two sides of the folding plate are arranged in an inclined structure, and the two sets of folding plates are arranged facing each other, forming a contraction structure that is narrow in the middle and wide at both ends in the oil guide box. This can gather and accelerate the flowing lubricant, prevent the lubricant from being dispersed and adhered on the inner wall of the oil guide box, and improve the lubricant delivery efficiency.

[0015] Preferably, a deformation baffle is fixedly connected to the horizontal side of the folding plate, and the deformation baffle is made of shape memory alloy. At room temperature, the deformation baffle is in a folded state and will not block the passage of the oil drain nozzle.

[0016] Preferably, when the gear body heats up due to prolonged meshing and friction, the shape memory alloy deformation baffle deforms and expands outwards under heat, blocking and turbulent the flowing lubricant. This prevents the lubricant from splashing directly off the meshing surface of the gear body under centrifugal force after its viscosity decreases due to high temperature, thereby improving the utilization rate of the lubricant under high-temperature working conditions.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) It is equipped with an oil drain nozzle and an oil guide box. During the rotation of the gear body, the centrifugal force is used to automatically transport the lubricating fluid stored in the oil storage box to the gear meshing surface. No additional external oil supply mechanism is required to achieve continuous self-lubrication of the gear meshing surface. At the same time, the oil drain nozzle is set in a frustum-shaped structure, with the diameter on the side facing the oil storage box being larger than the diameter on the outlet side. This can effectively increase the oil pressure at the outlet of the oil drain nozzle, accelerate the flow rate of the lubricating fluid, reduce the residual adhesion of lubricating fluid inside the oil drain nozzle, and avoid the waste of lubricating fluid.

[0018] (2) The oil storage box is equipped with a deformable rubber sealing ring and a cross-shaped oil drain groove. When the gear body speed increases and the centrifugal force increases, the sealing ring is squeezed to increase the opening of the oil drain groove, automatically increasing the amount of oil drained per unit time, adapting to the lubrication needs of the gear body at different speeds. At high speeds, more lubricant can be provided to meet higher lubrication requirements.

[0019] (3) The oil guide box is equipped with a folding plate. The two sets of inclined folding plates facing each other form a contraction structure that is narrow in the middle and wide at both ends inside the oil guide box. This can gather and accelerate the flow of lubricating fluid, prevent the lubricating fluid from adhering and dispersing on the inner wall of the oil guide box, effectively improve the conveying efficiency of the lubricating fluid inside the oil guide box, and ensure that the lubricating fluid can be stably and adequately conveyed to the oil drain nozzle.

[0020] (4) A deformation baffle is provided. The deformation baffle is made of shape memory alloy and can automatically deform according to the working temperature of the gear body. At normal temperature, the deformation baffle is in the closed state and will not block the oil passage of the oil drain nozzle, ensuring that the lubricant can be delivered to the gear meshing surface normally. When the gear body meshes and rubs for a long time, the overall temperature rises and the viscosity of the lubricant will decrease. At this time, the deformation baffle is heated and expands, blocking and turbulent the lubricant, slowing down the flow rate of the lubricant, and preventing the lubricant with reduced viscosity from splashing directly off the gear meshing surface under strong centrifugal force. This effectively improves the utilization rate of the lubricant under high temperature working conditions, reduces the waste of lubricant, and ensures the lubrication effect of the gear meshing surface under high temperature and high speed working conditions. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the gear body of the present invention; Figure 3 This is a three-dimensional structural diagram of the oil supply hole of the present invention; Figure 4 This is a three-dimensional sectional view of the gear body of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram of A in the middle; Figure 6 This is a three-dimensional structural diagram of the oil storage box of the present invention; Figure 7 This is a three-dimensional cross-sectional view of the oil storage box of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B; Figure 9 This is a three-dimensional cross-sectional view of the oil guide box of the present invention.

[0022] In the diagram: 1. Gearbox body; 2. Gear body; 3. Connecting shaft; 4. Oil drain nozzle; 5. Oil guide box; 6. Oil reservoir; 7. Oil supply hole; 8. Sealing gasket ring; 9. Oil drain groove; 10. Folding plate; 11. Deformation baffle. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: To ensure that the gear body 2 can automatically adjust the oil supply according to the speed and temperature during operation to meet the lubrication requirements under different working conditions, a sealing gasket ring 8 that can automatically deform and adjust the oil supply is provided. Additionally, an oil drain nozzle 4 is provided to increase the outflow pressure of the lubricating fluid. Figure 1 - Figure 6 and Figure 8The technical solution shown in the invention provides the following technical solution: a lubricated guide-type gearbox gear for new energy vehicles, including a gearbox body 1. A connecting shaft 3 is rotatably mounted inside the gearbox body 1, and a gear body 2 is mounted on the connecting shaft 3. The gearbox body 1 transmits power through the meshing of gear bodies 2 with different diameters. A lubrication mechanism is provided inside the gear body 2. The lubrication mechanism continuously lubricates the meshing surfaces of the gear bodies 2 by discharging the lubricating fluid stored inside. The lubrication mechanism includes an oil reservoir 6, which is fixedly connected inside the gear body 2. An oil supply hole 7 is provided through the oil reservoir 6 and the gear body 2, allowing lubricating fluid to be injected into the oil reservoir 6. Oil guide boxes 5 are arranged in a circular array on the side of the oil reservoir 6, and the oil guide boxes 5 are connected through the interior of the oil reservoir 6. An oil drain nozzle 4 is connected through the outer end of the oil guide boxes 5, and the oil drain nozzle 4 extends to the meshing tooth surface of the gear body 2. The lubricating fluid is lubricated by centrifugal force. The lubricant flows from the oil reservoir 6 into the oil guide box 5, and then continuously flows out through the oil drain nozzle 4 to the meshing position of the gear body 2, completing the lubrication of the meshing tooth surfaces. The oil drain nozzle 4 is designed in a frustum shape, and the diameter of the side of the oil drain nozzle 4 facing the oil guide box 5 is larger than the diameter of the other side of the oil drain nozzle 4. The frustum shape increases the oil pressure at the outlet of the oil drain nozzle 4, accelerates the flow rate of the lubricant, and reduces the amount of lubricant residue adhering inside the oil drain nozzle 4. Two sets of sealing gaskets 8 are fixedly connected inside the oil reservoir 6. The sealing ring 8 is made of deformable rubber and has an oil drain groove 9. The oil drain groove 9 is arranged in a "+" shape and corresponds one-to-one with the position of the oil guide box 5. When the lubricant flows from the oil storage box 6 into the oil guide box 5, it needs to pass through the oil drain groove 9 on the sealing ring 8. When the rotation speed of the gear body 2 increases, the centrifugal force will squeeze the deformable sealing ring 8, which will increase the opening range of the oil drain groove 9, thereby increasing the amount of oil discharged per unit time, which is suitable for the higher lubrication requirements of the gear body 2 when it operates at high speed.

[0025] Inside the gear body 2, there is an oil guide box 5 and an oil storage box 6. The lubricant pre-stored in the oil storage box 6 can flow through the oil drain groove 9 of the sealing ring 8 and the oil guide box 5 under the action of centrifugal force generated by the rotation of the gear, and finally flow out from the oil drain nozzle 4 to the meshing surface of the gear body 2, completing the continuous self-lubrication of the gear meshing surface. There is no need to set up an external oil supply structure, making the structure more streamlined. When the rotation speed of the gear body 2 increases and more lubricant is needed for lubrication, the greater centrifugal force will squeeze the deformable sealing ring 8 inside the oil storage box 6, increasing the opening range of the "+" shaped oil drain groove 9 on the sealing ring 8, thereby increasing the amount of lubricant passing through the oil drain groove 9 per unit time, automatically adapting to the lubrication needs of the gear body 2 at different speeds.

[0026] Meanwhile, the oil drain nozzle 4, which supplies lubricant, has a frustum-shaped structure. The diameter of the side facing the oil reservoir 6 is larger than the diameter of the outlet side. This can increase the oil pressure at the outlet of the oil drain nozzle 4 when the lubricant flows out, accelerate the flow rate of the lubricant, reduce the amount of lubricant residue on the inner wall of the oil drain nozzle 4, avoid the accumulation and waste of lubricant inside the oil drain nozzle 4, and ensure that the lubricant can be stably and adequately delivered to the meshing surface of the gear body 2.

[0027] Example 2: This example addresses the problem of lubricating fluid easily splashing and leaking after its viscosity decreases at high temperatures. Further improvements are made to the internal structure of the oil guide box 5, such as... Figure 7 - Figure 9 As shown, a flow guiding mechanism is provided on the outside of the lubrication mechanism. When the temperature of the gear body 2 increases during meshing and rotation, the flow guiding mechanism is used to guide the lubricating fluid, preventing the lubricating fluid from splashing outward due to reduced viscosity caused by high temperature. As shown in Figures 1 and 2, this invention provides the following technical solution: a lubrication guiding type gearbox gear for new energy vehicles. A flow guiding mechanism is provided on the outside of the lubrication mechanism. The flow guiding mechanism, through the deformation action of the deformation baffle 11 it contains, guides the lubricating fluid when the temperature of the gear body 2 increases during meshing and rotation, preventing the lubricating fluid from splashing outward due to reduced viscosity caused by high temperature. The flow guiding mechanism includes a folding plate 10, which is fixedly connected to the inner wall side of the oil guide box 5. The two sides of the folding plate 10 are arranged in an inclined structure, and the two sets of folding plates 10 are arranged facing each other, forming a contraction structure that is narrow in the middle and wide at both ends in the oil guide box 5. This can gather and accelerate the flowing lubricating fluid, preventing the lubricating fluid from dispersing and adhering on the inner wall of the oil guide box 5, and improving the lubricating fluid delivery efficiency.

[0028] Inside the oil guide box 5, there is a folding plate 10. The two sets of folding plates 10, which are inclined on the side, will form a contraction structure inside the oil guide box 5 that is narrow in the middle and wide at both ends. After the lubricant flows into the oil guide box 5, it will converge towards the middle under the gathering effect of the contraction structure, so as to avoid the lubricant from being dispersed and adhering to the inner wall of the oil guide box 5 and not being able to flow out smoothly. This ensures that the lubricant can maintain a sufficient flow rate and be stably delivered to the oil drain nozzle 4. The lubricant delivered to the meshing surface will not be insufficient due to the loss caused by the adhesion of the inner wall, thus ensuring a stable lubrication effect.

[0029] Example 3: Addressing the problem that in existing self-lubricating gears, the lubricant viscosity decreases under high-temperature operating conditions, making it prone to splashing and detaching from the gear meshing surface under centrifugal force, such as... Figure 7 - Figure 9The present invention provides the following technical solution: a lubricated guide gearbox gear for new energy vehicles, wherein a deformation baffle 11 is fixedly connected to the horizontal side of the folding plate 10, and the deformation baffle 11 is made of shape memory alloy. At room temperature, the deformation baffle 11 is in a retracted state and will not block the passage of the oil drain nozzle 4. When the gear body 2 is engaged and heated by friction for a long time, the shape memory alloy deformation baffle 11 deforms and expands outward under heat, blocking and turbulent the flow of lubricating fluid, preventing the lubricating fluid from splashing directly away from the meshing surface of the gear body 2 under the action of centrifugal force after the viscosity of the lubricating fluid decreases due to high temperature, thereby improving the utilization rate of lubricating fluid under high temperature working conditions.

[0030] When the gear body 2 heats up due to prolonged meshing friction, causing the lubricant viscosity to decrease, the shape memory alloy deformation baffle 11 will automatically deform under heat, expanding outward from its original closed state. This obstructs and turbulents the flow of lubricant from the oil guide box 5 to the oil drain nozzle 4, appropriately slowing down the outflow speed of the lubricant. This prevents the lubricant, after its viscosity has decreased, from rapidly flowing out under strong centrifugal force and splashing directly off the meshing tooth surface of the gear body 2. This allows the lubricant to remain stably on the meshing tooth surface to complete the lubrication function, reducing lubricant waste and ensuring the lubrication effect of the gear meshing surface under high-temperature working conditions. It also prevents the normal transmission and service life of the gear from being affected by lubricant splashing and loss.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lubricated guide-type gearbox gear for new energy vehicles, comprising a gearbox body (1), wherein a connecting shaft (3) is rotatably arranged inside the gearbox body (1), and a gear body (2) is arranged on the connecting shaft (3), wherein the gearbox body (1) achieves power transmission through the meshing of gear bodies (2) of different diameters, characterized in that, The gear body (2) is provided with a lubrication mechanism inside. The lubrication mechanism continuously lubricates the meshing surface of the gear body (2) by discharging the lubricating fluid stored inside. The lubrication mechanism is provided with a flow guiding mechanism on the outside. The flow guiding mechanism guides the flow of lubricating fluid when the temperature of the gear body (2) increases due to the deformation of the deformation baffle (11) contained therein, so as to avoid the lubricating fluid from splashing outward due to the decrease in viscosity caused by high temperature.

2. The lubricated guide type gearbox gear for new energy vehicles according to claim 1, characterized in that: The lubrication mechanism includes an oil reservoir (6), which is fixedly connected to the inside of the gear body (2), and an oil supply hole (7) is provided through the oil reservoir (6) and the gear body (2) to inject lubricant into the oil reservoir (6).

3. The lubricated guide type gearbox gear for new energy vehicles according to claim 2, characterized in that: The oil storage box (6) is provided with an oil guide box (5) in a ring array on its side, and the oil guide box (5) is connected to the inside of the oil storage box (6). The outer end of the oil guide box (5) is connected to the oil drain nozzle (4), and the oil drain nozzle (4) extends to the meshing tooth surface of the gear body (2). Under the action of centrifugal force, the lubricating fluid flows from the oil storage box (6) into the oil guide box (5), and then flows out through the oil drain nozzle (4) to the meshing position of the gear body (2) to complete the lubrication of the meshing tooth surface.

4. The lubricated guide type gearbox gear for new energy vehicles according to claim 3, characterized in that: The oil drain nozzle (4) is arranged in a frustum shape, and the diameter of the side of the oil drain nozzle (4) facing the oil guide box (5) is larger than the diameter of the other side of the oil drain nozzle (4). The frustum shape structure increases the oil pressure at the outlet of the oil drain nozzle (4), speeds up the flow of lubricating fluid, and reduces the residual adhesion of lubricating fluid inside the oil drain nozzle (4).

5. The lubricated guide type gearbox gear for new energy vehicles according to claim 4, characterized in that: The oil storage box (6) is internally fixedly connected with two sets of sealing gaskets (8), and the sealing gaskets (8) are made of deformable rubber material, and the sealing gaskets (8) are provided with oil drain grooves (9).

6. The lubricated guide type gearbox gear for new energy vehicles according to claim 5, characterized in that: The oil drain groove (9) is arranged in a "+" shape, and the oil drain groove (9) corresponds to the position of the oil guide box (5). When the lubricant flows from the oil storage box (6) into the oil guide box (5), it needs to pass through the oil drain groove (9) on the sealing gasket ring (8). When the rotation speed of the gear body (2) increases, the centrifugal force will squeeze the deformable sealing gasket ring (8), which will increase the opening range of the oil drain groove (9), thereby increasing the amount of oil drained per unit time, which is suitable for the higher lubrication requirements of the gear body (2) when it operates at high speed.

7. The lubricated guide type gearbox gear for new energy vehicles according to claim 6, characterized in that: The flow guiding mechanism includes a folding plate (10), which is fixedly connected to the inner wall side of the oil guide box (5). The two sides of the folding plate (10) are arranged in an inclined structure, and the two sets of folding plates (10) are arranged facing each other, forming a contraction structure that is narrow in the middle and wide at both ends in the oil guide box (5). This can gather and accelerate the flow of lubricating fluid, prevent the lubricating fluid from being dispersed and attached to the inner wall of the oil guide box, and improve the delivery efficiency of the lubricating fluid.

8. The lubricated guide type gearbox gear for new energy vehicles according to claim 7, characterized in that: The folding plate (10) has a deformation baffle (11) fixedly connected to the horizontal side. The deformation baffle (11) is made of shape memory alloy. At room temperature, the deformation baffle (11) is in a closed state and will not block the passage of the oil drain nozzle (4).

9. The lubricated guide type gearbox gear for new energy vehicles according to claim 8, characterized in that: When the gear body (2) is engaged and heated for a long time, the shape memory alloy deformation baffle (11) deforms and stretches outward under heat, blocking and turbulent the flow of lubricating fluid, preventing the lubricating fluid from splashing directly away from the meshing surface of the gear body (2) under the action of centrifugal force after the viscosity of the lubricating fluid decreases due to high temperature, thereby improving the utilization rate of lubricating fluid under high temperature working conditions.

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