A main reduction gear

Abstract

The application discloses a main reducer, which comprises a main reducer shell and an oil baffle. A driven gear is arranged in the main reducer shell, and the oil baffle is arranged in the main reducer shell and surrounds the driven gear of the main reducer. An envelope space is formed between the oil baffle and the driven gear, a fluid blocking area is formed between the driven gear and the oil baffle, the amount of lubricating oil entering the space between the outer periphery of the driven gear and the oil baffle is reduced, the oil stirring loss at high speed is reduced, and the mechanical efficiency of the transmission system is improved. A wedge-shaped space is formed between the first end of the circumferential bottom plate of the driven gear close to the lubricating oil inlet and the driven gear, the wedge-shaped space actively improves the flow kinetic energy of the lubricating oil, helps to form an oil film between the tooth surfaces more quickly and reliably, and effectively reduces friction and wear even at low speed. The oil baffle can improve the lubricating efficiency at low speed, reduce the oil stirring loss at high speed, and balance the lubrication and efficiency under all working conditions.

Description

Technical Field

[0001] This application relates to the field of commercial vehicle technology, and in particular to a main reducer. Background Technology

[0002] As one of the four major assemblies of a car, the performance of the drive axle directly affects the overall performance of the vehicle, and it is especially important for heavy-duty trucks.

[0003] Commercial vehicles are used for commercial cargo transportation or passenger transport, and are characterized by high load capacity, high usage intensity, and high requirements for reliability and durability.

[0004] Commercial vehicles using cylindrical gears as the main reducer in a through-type drive axle suffer from problems such as high oil loss at high speeds and poor lubrication at low speeds.

[0005] Therefore, how to solve the aforementioned problems of using cylindrical gears as the main reducer in a through-type drive axle has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This application proposes a main reducer to solve the problems of high oil loss at high speed and poor lubrication at low speed when using cylindrical gears as the main reducer in a through-type drive axle.

[0007] To achieve the above objectives, this application provides a main reducer, including a main reducer housing and an oil baffle. The oil baffle is installed inside the main reducer housing and surrounds the driven gear of the main reducer. Along the circumferential direction of the driven gear, the oil baffle extends from the lubricating oil inlet of the main reducer housing to the top oil inlet of the main reducer. The oil baffle includes a side plate and a bottom plate. The bottom plate is arranged along the circumferential direction of the driven gear, and the side plates are located at both ends of the bottom plate along the axial direction of the driven gear. An enveloping space is formed between the oil baffle and the driven gear. Along the circumferential direction of the driven gear, a wedge-shaped space is formed between the first end of the bottom plate near the lubricating oil inlet and the driven gear. The cross-sectional size of the wedge-shaped space gradually decreases along the flow direction of the lubricating oil to accelerate the flow rate of the lubricating oil.

[0008] Optionally, in the above-mentioned main reducer, the first end of the base plate is a first straight segment, the length extension direction of the first straight segment makes an angle α of 20° to 45° with the horizontal direction of the bridge assembly, and the first straight segment and the driven gear form the wedge-shaped space.

[0009] Optionally, in the above-mentioned main reducer, the second end of the base plate near the top oil inlet extends into the space between the main reducer housing and the oil receiving plate of the main reducer, and the wedge-shaped space is formed between the second end of the base plate and the oil receiving plate.

[0010] Optionally, in the above-mentioned main reducer, the second end of the base plate is a second straight segment, and the angle β between the length extension direction of the second straight segment and the oil receiving plate is 5° to 20°, and the wedge-shaped space is formed between the second straight segment and the oil receiving plate.

[0011] Optionally, in the above-mentioned main reducer, the portion of the base plate located between the first end and the second end is an arc-shaped segment, and the distance h between the arc-shaped segment and the gear is 2mm to 4mm.

[0012] Optionally, in the above-mentioned main reducer, the guide ribs are provided at least a portion of the base plate from the first end to the second end of the base plate, and the extension direction of the guide ribs is consistent with the circumferential direction of the driven gear; the number of guide ribs is at least one along the axial direction of the gear; the guide ribs are used to guide the flow of the lubricating oil.

[0013] Optionally, in the above-mentioned main reducer, the height of the guide rib is 1mm to 2mm along the radial direction of the driven gear; and / or, the width of the guide rib is 1mm to 2mm along the axial direction of the driven gear.

[0014] Optionally, in the above-mentioned main reducer, a teardrop-shaped microtexture is provided on the side of the base plate facing the driven gear, and the teardrop-shaped microtexture protrudes from the surface of the base plate facing the driven gear; along the flow direction of the lubricating oil, the width of the teardrop-shaped microtexture gradually decreases, and the height of the teardrop-shaped microtexture protruding from the base plate gradually decreases.

[0015] Optionally, in the above-mentioned main reducer, the oil baffle further includes a guide plate, which is rotatably connected to the end of the oil baffle near the lubricating oil inlet; the guide plate includes an abutting end and a movable end, the abutting end abuts against the side of the oil baffle facing the driven gear, and the guide plate can rotate around the abutting end in the direction closer to the driven gear under the impact of lubricating oil, so as to change the distance between the movable end and the outer periphery of the driven gear; a limit post is provided on the side plate, which is used to limit the movement of the guide plate towards the driven gear.

[0016] Optionally, in the above-mentioned main reducer, the oil baffle further includes a mounting boss, which is mounted on the side plate, and the main reducer housing includes a mounting groove that mates with the mounting boss; a plurality of mounting bosses are provided on the side plate along the circumference of the driven gear.

[0017] Optionally, in the above-mentioned main reducer, the oil baffle is formed by at least one of steel plate welding, steel plate stamping, casting and printing.

[0018] This application provides a main reducer, including a main reducer housing and an oil baffle. A driven gear is disposed within the main reducer housing, and the oil baffle is installed within the main reducer housing and surrounds the driven gear. The oil baffle covers the outer periphery of the driven gear and part of its tooth surfaces, forming an enveloping space between the oil baffle and the driven gear. This enveloping space creates a relatively closed fluid barrier area between the outer periphery of the driven gear and the oil baffle, reducing the amount of lubricating oil entering the area between the outer periphery of the driven gear and the oil baffle. This directly reduces oil churning losses at high speeds, improves the mechanical efficiency of the transmission system, and also helps reduce lubricating oil temperature rise and suppress foam generation. Along the circumference of the driven gear, a wedge-shaped space is formed between the first end of the base plate near the lubricating oil inlet and the driven gear. This wedge-shaped space actively enhances the flow kinetic energy of the lubricating oil, improving its ability to reach the meshing area or bearing position, and helps to form an oil film more quickly and reliably between the tooth surfaces, effectively reducing friction and wear even at low speeds. The oil baffle in this solution can improve lubrication efficiency at low speeds and reduce oil churning loss at high speeds, achieving a balance between lubrication and efficiency under all operating conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0020] Figure 1 This is a schematic diagram of the main reducer provided in the embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the driven gear and the oil baffle provided in the embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the oil baffle provided in the embodiment of this application;

[0023] Figure 4 This is an enlarged view of the structure of the first end of the oil baffle provided in the embodiment of this application;

[0024] Figure 5 yes Figure 3 A magnified view of part A in the image;

[0025] Figure 6 This is a schematic diagram of the structure of the guide plate provided in the embodiment of this application;

[0026] Figure 7 This is a side view of the teardrop-shaped microtexture provided in the embodiments of this application;

[0027] Figure 8 This is a front view of the teardrop-shaped microtexture provided in the embodiments of this application;

[0028] Figure 9 This is a schematic diagram of the position of the deflector at low vehicle speed provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of the position of the deflector at high vehicle speeds provided in the embodiments of this application.

[0030] in:

[0031] 100 - Main reducer housing; 110 - Lubricating oil inlet; 120 - Top oil inlet; 130 - Oil receiving plate;

[0032] 200-Oil baffle; 210-Side plate; 220-Bottom plate; 221-First straight section; 222-Second straight section; 223-Guide rib; 224-Teardrop-shaped microtexture; 230-Guide plate; 231-Abutting end; 232-Moving end; 240-Limiting post; 250-Mounting boss;

[0033] 300 - Driven gear. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0035] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0036] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0037] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0038] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0039] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0040] Commercial vehicles (especially heavy trucks and buses) use cylindrical gears as the main reducer in through-type drive axles, which results in high losses at high speeds and poor lubrication at low speeds.

[0041] When a vehicle travels at high speed on good road conditions such as highways, the spur gears of the main reducer rotate at very high speeds. The gears violently "slap" or "stir" the lubricating oil at the bottom of the axle housing, causing the lubricating oil to splash. This process itself consumes some of the engine's power (called oil churning loss), leading to increased fuel consumption. At the same time, the excessive stirring of the lubricating oil will generate a lot of foam and heat, raising the oil temperature and accelerating oil aging.

[0042] When a vehicle is under heavy load starting, climbing hills, or off-road conditions, the cylindrical gears of the main reducer need to transmit enormous force. At this time, the rotational speed of the cylindrical gears is low and the splashing force is weak, which cannot effectively agitate and splash the lubricating oil onto the gear meshing surfaces, bearings, and other key parts that need lubrication. This causes these friction pairs to be in a state of boundary lubrication or even brief dry friction, resulting in wear, pitting, or even sintering.

[0043] The lubrication of cylindrical gears relies on the gears being immersed in oil or on the splashing of oil by other gears. To ensure lubrication at low speeds, the oil level should not be too low to ensure that the gears are immersed in oil. However, a higher oil level at high speeds will inevitably lead to a greater immersion depth of the gears, more intense agitation, and a sharp increase in wear and heat generation.

[0044] Please see Figure 1 This application discloses a main reducer, including a main reducer housing 100 and an oil baffle 200.

[0045] A driven gear 300 is provided inside the main reducer housing 100, and an oil baffle 200 is installed inside the main reducer housing 100 and arranged around the driven gear 300 of the main reducer.

[0046] Along the circumferential direction of the driven gear 300, the oil baffle 200 extends from the lubricating oil inlet 110 of the main reducer housing 100 to the top oil inlet 120 of the main reducer. The oil baffle 200 is generally arc-shaped.

[0047] The oil baffle 200 includes a side plate 210 and a base plate 220. The base plate 220 is arranged along the circumference of the driven gear 300, and the side plates 210 are located at both ends of the base plate 220 along the axial direction of the driven gear 300. There are two side plates 210.

[0048] Along the radial direction of the driven gear 300, the cross-section of the oil baffle 200 is U-shaped. Optionally, the two side plates 210 have equal heights, and the height of the side plate 210 is the dimension of the side plate 210 along the radial direction of the driven gear 300.

[0049] The oil baffle 200 covers the outer periphery of the driven gear 300 and part of the tooth surface of the driven gear 300. The tooth surface of the driven gear 300 is the surface located at both ends of the driven gear 300 along the axial direction of the driven gear 300. The oil baffle 200 covers part of the tooth surface of the driven gear 300 near the outer periphery, and an enveloping space is formed between the oil baffle 200 and the driven gear 300.

[0050] The enveloping space creates a relatively closed fluid barrier area between the outer periphery of the driven gear 300 and the oil baffle 200, reducing the amount of lubricating oil entering the area between the driven gear 300 and the oil baffle 200. The enveloping space actively controls the contact area between the driven gear 300 and the lubricating oil, reducing the thickness of the oil film adhering to the surface of the driven gear 300 and the amount of oil carried at high speeds, thus reducing oil churning losses caused by the driven gear 300 agitating the lubricating oil. The oil baffle 200 not only directly reduces oil churning losses at high speeds and improves the mechanical efficiency of the transmission system, but also helps reduce lubricating oil temperature rise, suppress foam generation, and reduce noise and vibration caused by oil disturbance.

[0051] Along the circumference of the driven gear 300, a wedge-shaped space is formed between the first end of the base plate 220 near the lubricating oil inlet 110 and the driven gear 300. The cross-sectional dimensions of the wedge-shaped space gradually decrease along the flow direction of the lubricating oil, forming a flow channel with a gradually converging cross-sectional area that continuously shrinks between the inner surface of the oil baffle 200 and the rotating driven gear 300. The cross-section of the wedge-shaped space is the cross-section perpendicular to the axis of the driven gear 300. The gradual decrease in the cross-sectional dimensions of the wedge-shaped space results in a gradual reduction in the distance between the base plate 220 and the outer periphery of the driven gear 300.

[0052] At low speeds, the driven gear rotates slowly, generating weak centrifugal force, resulting in poor splash lubrication and difficulty in effectively delivering lubricating oil to the meshing areas requiring lubrication. This solution actively enhances the flow kinetic energy of the lubricating oil through a wedge-shaped space, improving its ability to reach the meshing areas or bearing positions. This helps form an oil film between the gear surfaces more quickly and reliably, effectively reducing friction and wear even at low speeds. This design transforms lubricating oil from "passively relying on centrifugal splash" to "actively boosting pressure and speed," especially for low-speed conditions. It ensures stable and reliable lubrication for the main reducer under all operating conditions, thereby improving reliability, reducing wear, and extending service life.

[0053] The oil baffle 200 in this solution can improve lubrication efficiency at low speeds, reduce oil churning loss at high speeds, and achieve a balance between lubrication and efficiency under all operating conditions.

[0054] The length of the wedge-shaped space along the circumference of the driven gear is selected by those skilled in the art based on actual needs.

[0055] For ease of subsequent description, the end of the base plate 220 near the lubricating oil inlet 110 is designated as the first end of the base plate 220, and the end of the base plate 220 near the top oil inlet 120 is designated as the second end of the base plate 220. The second end of the base plate 220 extends between the main reducer housing 100 and the oil receiving plate 130 of the main reducer, and extends towards the top oil inlet 120.

[0056] In some embodiments of this application, a wedge-shaped space is formed between the first end of the base plate 220 and the second end of the base plate 220 and the driven gear 300. For ease of subsequent description, the wedge-shaped space between the first end of the base plate 220 and the driven gear 300 is named the first wedge-shaped space, and the wedge-shaped space between the second end of the base plate 220 and the driven gear 300 is named the second wedge-shaped space.

[0057] The portion of the base plate 220 located between its first end and its second end is the middle portion of the base plate 220.

[0058] The first wedge-shaped space formed between the first end of the base plate 220 and the driven gear 300, such as Figure 1 As shown, along the direction perpendicular to the axis of the driven gear 300, the cross section of the first wedge-shaped space is approximately triangular. Along the flow direction of the lubricating oil, the distance between the first end of the base plate 220 and the outer periphery of the driven gear 300 gradually decreases, squeezing the lubricating oil. The first wedge-shaped space accelerates the lubricating oil supplied between the middle of the base plate 220 and the main reducer housing 100.

[0059] In an embodiment where a second wedge-shaped space is formed between the second end of the base plate 220 and the driven gear 300, such as Figure 1 As shown, along the direction perpendicular to the axis of the driven gear 300, the cross section of the second wedge-shaped space is approximately trapezoidal. Along the flow direction of the lubricating oil, the distance between the second end of the base plate 220 and the oil receiving plate 130 gradually decreases, squeezing the lubricating oil. The second wedge-shaped space accelerates the lubricating oil supplied from the middle of the base plate 220 and the main reducer housing 100 into the top oil inlet 120.

[0060] The lubricating oil supplied through the lubricating oil inlet 110 enters the envelope space between the middle of the base plate 220 and the main reducer housing 100 through the first wedge-shaped space, and the first wedge-shaped space accelerates the lubricating oil for the first time; then, a portion of the lubricating oil that has entered the envelope space between the middle of the base plate 220 and the main reducer housing 100 enters the top oil inlet 120 through the second wedge-shaped space, and the second wedge-shaped space accelerates the lubricating oil for the second time.

[0061] When the vehicle is at low speed, the two-stage wedge effect of the oil baffle 200 is used to actively increase the kinetic energy of the lubricating oil and improve lubrication. When the vehicle is at high speed, the enveloping space is used to reduce the amount of oil in contact with the driven gear 300, reduce the oil churning loss at high speed, and achieve a balance between lubrication and efficiency under all working conditions.

[0062] Wedge-shaped spaces are positioned at both ends of the base plate 220 along the circumferential direction of the driven gear 300. The wedge-shaped space at the first end of the base plate 220 establishes an initial flow velocity for the lubricating oil entering the entire envelope space, ensuring that the lubricating oil can be effectively introduced into the envelope space. The wedge-shaped space at the second end of the base plate 220 sets a discharge velocity for the lubricating oil in the entire envelope space, accelerating the exit of the lubricating oil through the envelope space and reducing the retention of lubricating oil in the envelope space. The envelope space, together with the wedge-shaped spaces at the first and second ends, forms a complete and smooth directional flow path, and facilitates the design of the first and second wedge-shaped spaces.

[0063] It facilitates connection to the lubricating oil inlet 110 and the top oil inlet 120 to a certain extent, which helps lubricate the transmission system.

[0064] Optionally, the wedge-shaped space is established by optimizing the structure of the first end of the base plate 220. The first end of the base plate 220 is a first straight segment 221, and the angle α between the length extension direction of the first straight segment 221 and the horizontal direction of the bridge assembly is 20° to 45°. A wedge-shaped space is formed between the first straight segment 221 and the driven gear 300. Along the flow direction of the lubricating oil, the distance between the first straight segment 221 and the driven gear 300 gradually decreases.

[0065] Optionally, the wedge-shaped space is established by optimizing the structure of the second end of the base plate 220. The second end of the base plate 220 is a second straight segment 222, and the angle β between the extension direction of the second straight segment 222 and the oil receiving plate 130 is 5° to 20°, forming a wedge-shaped space between the second straight segment 222 and the oil receiving plate 130. Along the flow direction of the lubricating oil, the distance between the second straight segment 222 and the oil receiving plate 130 gradually decreases.

[0066] Optionally, β ≤ α. A larger angle α between the length extension direction of the first straight segment 221 and the horizontal direction of the bridge assembly makes the entrance of the first wedge-shaped space steeper, rapidly generating strong compression and acceleration of the oil, forcefully drawing in the oil and imparting high kinetic energy. A smaller angle β between the length extension direction of the second straight segment 222 and the oil receiving plate 130 makes the flow of lubricating oil in the outlet channel smoother, quickly discharging the lubricating oil.

[0067] Optionally, the length of the first straight segment 221 is less than the length of the second straight segment 222, that is, along the circumference of the driven gear, the length of the first wedge space is less than the length of the second wedge space.

[0068] The first straight segment 221 and the second straight segment 222 are smoothly connected to the middle of the base plate 220 to avoid the generation of eddies due to abrupt changes in the flow direction of the lubricating oil, thereby reducing energy loss; eliminating stress concentration, and improving the overall structural reliability and durability of the oil baffle 200.

[0069] A wedge-shaped space is established between the first straight segment 221 and the second straight segment 222 and the driven gear 300. Firstly, the structure of the straight segments is simple and easy to process, achieving uniform and predictable gradual shrinkage of the wedge-shaped space. Secondly, the flow channel wall formed by the straight segments is smooth, without complex curvature changes, making it less likely to generate uncontrollable eddies or separation, ensuring that the acceleration of lubricating oil by the wedge-shaped space is efficient and repeatable. Thirdly, the straight segments have better rigidity and resistance to deformation when subjected to oil impact.

[0070] The height of the portion of side plate 210 corresponding to the first straight segment 221 and the second straight segment 222 is less than the height of the portion of the far side plate 210 located between the first straight segment 221 and the second straight segment 222. The height of the portion of side plate 210 corresponding to the first straight segment 221 and the second straight segment 222 is slightly higher than the plane of the base plate 220 facing the driven gear 300. Optionally, there is a smooth transition between the side plate 210 corresponding to the first straight segment 221 and the second straight segment 222 and the side plate 210 located between the first straight segment 221 and the second straight segment 222.

[0071] The portion of the base plate 220 located between the first and second ends is an arc-shaped segment, which is coaxial with the driven gear 300.

[0072] In some embodiments of this application, such as Figure 2 As shown, the distance h between the arc segment and the gear is 2mm to 4mm. The small gap forms a small envelope space, which controls the oil volume and guides the driven gear 300 to throw out lubricating oil, so that the lubricating oil flows along a preset path, reducing the direct agitation and oil throwing of the gear, thereby significantly reducing oil agitation loss and improving transmission efficiency.

[0073] In some embodiments of this application, guide ribs 223 are provided at least a portion of the base plate 220 from the first end to the second end of the base plate 220, and the extending direction of the guide ribs 223 is consistent with the circumferential direction of the driven gear 300.

[0074] like Figure 3 and Figure 4 As shown, the guide rib 223 protrudes from the base plate 220 and is positioned facing the driven gear 300. The guide rib 223 provides a guiding function during the flow of lubricating oil, allowing the lubricating oil to flow orderly along the guide rib 223, avoiding unnecessary splashing, and reducing the flow resistance and kinetic energy loss of the lubricating oil.

[0075] like Figure 3 As shown, the guide rib 223 extends from the first end of the base plate 220 to the second end of the base plate 220, so that the guide rib 223 always guides the flow of lubricating oil when it flows throughout the entire envelope space. At the same time, the guide rib 223 can improve the rigidity and strength of the oil baffle 200.

[0076] Along the axial direction of the driven gear 300, the number of guide ribs 223 is at least one.

[0077] In embodiments where there are at least two guide ribs 223, the at least two guide ribs 223 are evenly distributed along the axial direction of the driven gear 300.

[0078] Optionally, the cross-section of the guide rib 223 is rectangular along the radial direction of the driven gear 300.

[0079] The cross-section of the guide rib 223 is not limited to a rectangle; it can also be trapezoidal, semi-circular, or other shapes that can guide the flow of lubricating oil, all of which are within the scope of protection of this application.

[0080] Along the circumference of the driven gear 300, the two sidewalls of the guide rib 223 are concave rounded corners, which makes the lubricating oil flow more smoothly when passing through the guide rib 223, reducing flow separation and eddies. The presence of the guide rib 223 can easily cause iron filings to accumulate at the rounded corners of the guide rib 223. In this design, the radius of the rounded corner of the guide rib 223 is designed to be greater than the height of the guide rib 223, so as to form a gentle and open shallow groove on the sidewall of the guide rib 223, thus avoiding iron filings accumulation.

[0081] In some embodiments of this application, the height of the guide rib 223 is 1mm to 2mm along the radial direction of the gear; and / or, the width of the guide rib 223 is 1mm to 2mm along the axial direction of the gear.

[0082] To further optimize the above technical solutions, such as Figure 3 and Figure 4 As shown, this design provides a teardrop-shaped microtexture 224 on the side of the base plate 220 facing the driven gear 300, and the teardrop-shaped microtexture 224 protrudes from the surface of the base plate 220 facing the driven gear 300.

[0083] Optionally, such as Figure 7 and Figure 8 As shown, along the flow line of the lubricating oil, the width of the teardrop-shaped microtexture 224 gradually decreases, and the height of the teardrop-shaped microtexture 224 protruding from the base plate 220 gradually decreases.

[0084] The teardrop-shaped microtexture 224 is evenly distributed on the surface of the base plate 220 facing the driven gear 300. The teardrop-shaped microtexture 224 itself is streamlined, with a rounded front end that facilitates smooth oil flow and a pointed tail that facilitates flow closure and reduces downstream eddies. When the lubricating oil flows along the inner surface of the oil baffle 200, it enters the teardrop-shaped microtexture 224. As the teardrop-shaped microtexture 224 converges in a wedge shape along the flow direction of the lubricating oil, the oil is squeezed at high speed, enhancing the dynamic pressure effect of the teardrop-shaped microtexture 224. This makes the surface of the base plate 220 facing the driven gear 300 exhibit oleophobic properties, reducing the flow resistance of the lubricating oil and facilitating the flow of the lubricating oil to the top oil inlet 120 of the main reducer housing 100.

[0085] In some embodiments of this application, such as Figure 3 and Figure 6 As shown, the oil baffle 200 also includes a guide plate 230, which is rotatably connected to one end of the oil baffle 200 near the lubricating oil inlet 110. Along the axial direction of the driven gear 300, the guide plate 230 has a connecting plate, which is located outside the oil baffle 200 and is rotatably connected to the side plate 210 of the oil baffle 200.

[0086] One end of the deflector 230 is located inside the oil baffle 200 and abuts against the side of the oil baffle 200 facing the driven gear 300. This end is named the abutment end 231. The other end of the deflector 230 is located outside the oil baffle 200. This end is named the movable end 232.

[0087] like Figure 9 As shown, at low speed, the guide plate 230 abuts against the side plate 210 under the action of gravity. At this time, the distance between the guide plate 230 and the outer periphery of the driven gear 300 is the largest, which increases the oil intake and improves lubrication.

[0088] like Figure 10 As shown, at high vehicle speeds, the oil pressure of the lubricating oil increases, causing the lubricating oil to impact the guide plate 230. The guide plate 230 rotates around the abutment end 231 towards the outer periphery of the driven gear 300, reducing the distance between the guide plate 230 and the outer periphery of the driven gear 300. Optionally, the straight line containing the abutment end 231 is collinear with the axis of rotation of the guide plate 230.

[0089] A limiting post 240 is provided on the side plate 210. The limiting post 240 is used to limit the movement of the guide plate 230 toward the driven gear 300. Under the impact of the lubricating oil, the guide plate 230 moves to abut against the limiting post 240. At this time, the distance between the guide plate 230 and the outer periphery of the driven gear 300 is minimized, reducing the oil intake and reducing the oil churning loss at high speeds.

[0090] Optionally, the guide vane 230 is rotatably connected to the side plate 210 via a rotating shaft. By swinging the guide vane 230 around the rotating shaft, the distance between the guide vane 230 and the outer periphery of the driven gear 300 can be adaptively increased or decreased, thereby effectively improving the problems of insufficient lubrication at low speeds and high oil loss during high-speed churning.

[0091] like Figure 9 As shown, there is a gap between the deflector 230 and the connecting plate to accommodate the side plate 210. At low vehicle speeds, the portion of the deflector 230 corresponding to the gap can abut against the side plate 210. The movable end 232 of the deflector 230 has a flat surface on the side facing the base plate 220 and an inclined surface on the side facing away from the base plate 220, reducing the difficulty for the lubricating oil to drive the deflector 230.

[0092] To ensure that the installation position of the oil baffle 200 is consistent with the design, the angle α between the first straight segment 221 and the horizontal direction of the axle assembly, the angle β between the second straight segment 222 and the oil receiving plate 130, and the clearance h between the oil baffle 200 and the driven gear 300, the oil baffle 200 also includes a mounting boss 250, which is mounted on the side plate 210. The main reducer housing 100 includes a mounting groove that mates with the mounting boss 250.

[0093] Optionally, multiple mounting bosses 250 are provided on the side plate 210 along the circumference of the driven gear 300 to achieve multi-point positioning of the oil baffle 200 and improve positioning accuracy.

[0094] like Figure 3 As shown, mounting bosses 250 are provided at both ends and in the middle of the oil baffle 200.

[0095] There are several ways to form the oil baffle 200. Optionally, the oil baffle 200 can be formed by at least one of the following: steel plate welding, steel plate stamping, casting, and printing.

[0096] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A main reducer, characterized in that, Includes a main reducer housing (100) and an oil baffle (200), the oil baffle (200) being installed inside the main reducer housing (100) and surrounding the driven gear (300) of the main reducer. Along the circumferential direction of the driven gear (300), the oil baffle (200) extends from the lubricating oil inlet (110) of the main reducer housing (100) to the top oil inlet (120) of the main reducer. The oil baffle (200) includes a side plate (210) and a bottom plate (220). The bottom plate (220) is arranged along the circumference of the driven gear (300). The side plate (210) is located at both ends of the bottom plate (220) along the axial direction of the driven gear (300). An enveloping space is formed between the oil baffle (200) and the driven gear (300). Along the circumference of the driven gear (300), a wedge-shaped space is formed between the first end of the base plate (220) near the lubricating oil inlet (110) and the driven gear (300). The cross-sectional size of the wedge-shaped space gradually decreases along the flow direction of the lubricating oil to accelerate the flow rate of the lubricating oil.

2. The main reducer according to claim 1, characterized in that, The first end of the base plate (220) is a first straight segment (221), the length extension direction of the first straight segment (221) and the horizontal direction of the bridge assembly are at an angle α of 20° to 45°, and the first straight segment (221) and the driven gear (300) form the wedge-shaped space.

3. The main reducer according to claim 1 or 2, characterized in that, The second end of the base plate (220) near the top oil inlet (120) extends into the space between the main reducer housing (100) and the oil receiving plate (130) of the main reducer, and the wedge-shaped space is formed between the second end of the base plate (220) and the oil receiving plate (130).

4. The main reducer according to claim 3, characterized in that, The second end of the base plate (220) is a second straight segment (222), and the angle β between the length extension direction of the second straight segment (222) and the oil receiving plate (130) is 5° to 20°. The wedge-shaped space is formed between the second straight segment (222) and the oil receiving plate (130).

5. The main reducer according to claim 3, characterized in that, The portion of the base plate (220) between the first end and the second end is an arc-shaped segment, and the distance h between the arc-shaped segment and the gear is 2mm to 4mm.

6. The main reducer according to claim 1, characterized in that, From the first end of the base plate (220) to the second end of the base plate (220), guide ribs (223) are provided at least partially on the base plate (220), and the extending direction of the guide ribs (223) is consistent with the circumferential direction of the driven gear (300); Along the axial direction of the gear, the number of the guide ribs (223) is at least one; The guide rib (223) is used to guide the flow of the lubricating oil.

7. The main reducer according to claim 6, characterized in that, Along the radial direction of the driven gear (300), the height of the guide rib (223) is 1mm to 2mm; and / or, Along the axial direction of the driven gear (300), the width of the guide rib (223) is 1mm to 2mm.

8. The main reducer according to claim 1, 2, 6 or 7, characterized in that, The base plate (220) is provided with a teardrop-shaped microtexture (224) on the side facing the driven gear (300), and the teardrop-shaped microtexture (224) protrudes from the surface of the base plate (220) facing the driven gear (300); Along the flow direction of the lubricating oil, the width of the teardrop-shaped microtexture (224) gradually decreases, and the height of the teardrop-shaped microtexture (224) protruding from the base plate (220) gradually decreases.

9. The main reducer according to claim 1, 2, 6 or 7, characterized in that, The oil baffle (200) also includes a guide plate (230), which is rotatably connected to the end of the oil baffle (200) near the lubricating oil inlet (110); The guide plate (230) includes an abutting end (231) and a movable end (232). The abutting end (231) abuts against the side of the oil baffle (200) facing the driven gear (300). The guide plate (230) can rotate around the abutting end (231) in the direction closer to the driven gear (300) under the impact of lubricating oil, so as to change the distance between the movable end (232) and the outer periphery of the driven gear (300). A limiting post (240) is provided on the side plate (210), and the limiting post (240) is used to limit the movement of the guide plate (230) toward the driven gear (300).

10. The main reducer according to claim 1, 2, 6 or 7, characterized in that, The oil baffle (200) also includes a mounting boss (250), which is mounted on the side plate (210), and the main reducer housing (100) includes a mounting groove that mates with the mounting boss (250); Along the circumference of the driven gear (300), a plurality of mounting bosses (250) are provided on the side plate (210).

11. The main reducer according to claim 1, 2, 6 or 7, characterized in that, The oil shield (200) is formed by at least one of the following methods: steel plate welding, steel plate stamping, casting, and printing.

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