An oil collecting groove component for lubricating bearings and a gearbox

Abstract

This utility model discloses an oil collecting groove component for lubricating bearings and a gearbox, belonging to the field of engineering machinery technology. It includes a flange ring segment, an oil collecting groove segment, and an outer edge ring segment. The flange ring segment is a section of a circular ring used for mounting on a bearing mounting seat. The oil collecting groove segment is perpendicular to the flange ring segment and located above it. The oil collecting groove segment is an arc-shaped band with two opposing arc edges, one of which connects to the inner ring of the flange ring segment. The outer edge ring segment is perpendicular to the oil collecting groove segment and located above it. The outer edge ring segment is a section of a circular ring, and its outer ring connects to the other arc edge of the oil collecting groove segment. This utility model, by configuring an oil collecting groove component for the input shaft bearing of the gearbox, collects lubricating oil when the input shaft operates at high speed and supplies lubricating oil to the bearing when the input shaft operates at low speed, thereby preventing dry friction damage to the bearing.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and relates to a gearbox, specifically, to an oil collection groove component for collecting lubricating oil for bearings in a gearbox. Background Technology

[0002] An electric drive transmission (E-CVT) is a drivetrain system used in electric vehicles, primarily in hybrid vehicles. It works in conjunction with an electric motor or engine to transmit power and change speeds.

[0003] Traditional electric drive transmissions used active lubrication circuits for gear lubrication. However, with technological advancements, some existing electric drive transmissions no longer have active lubrication circuits and instead use splash lubrication to lubricate their internal gear sets, bearings, and other rotating components. Splash lubrication is a lubrication method that uses oil droplets or mist splashed during the operation of the input shaft to lubricate the internal parts of the transmission.

[0004] To install the input shaft within the gearbox housing, a bearing mount is required at both the front and rear of the housing. One bearing is installed in each mount, and these two bearings provide front-to-back support for the input shaft, enabling its rotational assembly. Since the bearings are rotating components, lubrication is necessary during operation to reduce friction.

[0005] In gearboxes using splash lubrication, when the input shaft operates at low speeds (less than 2000 rpm), the lubricating oil inside the housing cannot be fully swirled up. This often results in splashed lubricating oil failing to reach the bearings on the input shaft, leading to poor bearing lubrication. Furthermore, after a long period of inactivity, starting the machine at low speeds or running it at low speeds for extended periods exposes the bearings to dry friction due to the lack of lubricating oil. This accelerates bearing wear and shortens the gearbox's lifespan.

[0006] To address the aforementioned issues, Chinese utility model patent application CN210978482U discloses a lubrication structure for a power transmission device. This structure features an oil collection groove on one side of the input shaft, with its front and rear openings inserted into the front and rear bearing seats, respectively. An oil guide rib is located in the middle of the housing, and an oil baffle rib is positioned at the top inner side of the housing, directly above the oil collection groove. This allows the swirled lubricating oil to be thrown upwards along the inner wall of the housing, passing through the oil guide rib in the middle, and finally reaching the oil baffle rib at the top before falling into the oil collection groove. The oil collection groove is higher in the middle and lower at both ends, allowing the lubricating oil to flow along the groove to the front and rear bearing seats, thereby lubricating the front and rear bearings installed in the seats.

[0007] While this existing structural design can address the lubrication issue of the two bearings during low-speed operation of the input shaft to some extent, its oil collection groove lacks an oil storage function. When the machine is stopped, all the lubricating oil in the groove flows into the housing cavity. When the machine is restarted at low speed after a long period of inactivity, the bearings will experience dry friction for a period of time until lubricating oil is collected in the groove before it can provide lubrication. Therefore, the problem of dry friction damage still exists for the bearings.

[0008] In addition, the existing technology has a relatively complex structural design and requires modification of the gearbox housing structure, making it inconvenient to apply to existing gearbox products and to achieve rapid upgrades to existing gearboxes. Summary of the Invention

[0009] This utility model addresses at least one of the aforementioned technical problems in the prior art by proposing an oil collecting groove component for lubricating bearings. By storing lubricating oil under normal operating conditions for use by the bearings under special operating conditions, it can prevent dry friction damage to the bearings.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] In one aspect, this utility model provides an oil collecting groove component for lubricating bearings, comprising:

[0012] Flange ring section, which is a ring-shaped section, is used for mounting on bearing mounting base;

[0013] The oil collecting groove annular segment is perpendicular to the flange annular segment and is located above the flange annular segment; the shape of the oil collecting groove annular segment is an arc band with two opposite arc edges, one of which is connected to the inner ring of the flange annular segment.

[0014] The outer ring segment is perpendicular to the oil collecting groove ring segment and is located above the oil collecting groove ring segment; the outer ring segment is a section of a circle, and the outer ring is connected to another arc edge of the oil collecting groove ring segment.

[0015] In some embodiments of this application, an outwardly flanged edge can be formed on the inner ring of the outer edge ring segment, which is arc-shaped and transitions upward and away from the oil collecting groove ring segment, in order to increase the oil receiving area and introduce the splashed lubricating oil into the oil collecting groove ring segment for collection, and then supply the bearing in the bearing mounting seat for lubrication.

[0016] In some embodiments of this application, in order to facilitate the installation of the oil collecting groove component onto the bearing mounting base, several threaded holes can be opened on the flange ring section, and the flange ring section can be installed onto the bearing mounting base by means of bolt fixing.

[0017] In some embodiments of this application, the flange ring segment, oil collection groove ring segment, and outer edge ring segment can be configured to be integrally formed, with the connection parts having a rounded transition, in order to eliminate connection gaps and prevent oil from accumulating.

[0018] In some embodiments of this application, the flange ring segment, oil collection groove ring segment, and outer edge ring segment can be configured to have the same center direction and a central angle of less than 180°, so that the oil collection groove component can form a semi-encircling posture at the bottom of the input shaft of the gearbox, so as to facilitate the collection and storage of lubricating oil.

[0019] In another aspect, this utility model also proposes a gearbox, including a housing, a bearing mounting seat disposed in the housing, a bearing mounted on the bearing mounting seat, the bearing being rotatably assembled with an input shaft, and an oil collecting groove component for lubricating the bearing mounted on the bearing mounting seat. The oil collecting groove component includes a flange ring segment, an oil collecting groove ring segment, and an outer edge ring segment. The flange ring segment is a segment of a circular ring and is mounted on the inner side of the bearing mounting seat facing the center of the housing. The oil collecting groove ring segment is perpendicular to the flange ring segment and is located above the flange ring segment. The oil collecting groove ring segment is an arc segment with two opposite arc edges, one of which is connected to the inner ring of the flange ring segment. The outer edge ring segment is perpendicular to the oil collecting groove ring segment and is located above the oil collecting groove ring segment. The outer edge ring segment is a segment of a circular ring and its outer ring is connected to the other arc edge of the oil collecting groove ring segment.

[0020] In some embodiments of this application, the oil collection groove component is configured to be located at the bottom of the input shaft, with its opening facing upward, encircling the lower area of ​​the input shaft, so as to facilitate the collection of splashed lubricating oil rolled up by the rotation of the input shaft.

[0021] In some embodiments of this application, the center of the oil collecting groove annular segment can be configured to be located on the axis of the input shaft, and the diameter of the oil collecting groove annular segment is larger than the diameter of the largest circumference of the internal rolling elements of the bearing and smaller than the outer diameter of the outer ring of the bearing. By configuring the depth of the oil collecting groove annular segment in this way, it is not only ensured that the lubricating oil collected in the oil collecting groove component will not be completely lost through the internal rolling elements of the bearing, but also that the problem of having to collect a large amount of lubricating oil in the oil collecting groove component (i.e., the lubricating oil being collected to a high height) before flowing to the internal rolling elements of the bearing can be avoided. That is, a technical effect of both storing oil and timely supplying oil is achieved.

[0022] In some embodiments of this application, the center of the outer ring segment can be configured to be located on the axis of the input shaft, and the inner diameter of the outer ring segment is larger than the outer diameter of the input shaft but smaller than the diameter of the central circumference of the bearing's internal rolling elements. This configuration, on the one hand, leaves sufficient space between the outer ring segment and the input shaft to form an oil inlet, facilitating the introduction of splashed lubricating oil from the housing into the oil collection groove component for storage; on the other hand, it ensures sufficient oil storage capacity, avoiding problems such as poor bearing lubrication.

[0023] In some embodiments of this application, the gearbox typically has two bearing mounting seats, one at the front and one at the rear, within its housing. Each bearing mounting seat contains one bearing, and the two bearings are rotatably assembled with the front and rear ends of the input shaft, respectively. This application installs an oil collection groove component on each bearing mounting seat to solve the problem of poor lubrication of the two bearings when the input shaft rotates at low speed.

[0024] Compared with the prior art, the advantages and positive effects of this utility model are mainly reflected in:

[0025] 1. This utility model designs an oil collection groove component that is roughly semi-circular in shape. It is installed on the bearing mounting seat of the gearbox and located at the bottom of the input shaft, with its opening facing upwards. This forms a semi-encircling shape around the input shaft, allowing for the collection of splashed lubricating oil regardless of whether the input shaft rotates forward or backward. When the input shaft is running at low speed, the lubricating oil stored in the oil collection groove component can be used to lubricate the bearings, thus solving the problem of poor lubrication of the bearings in the gearbox during low-speed input shaft operation.

[0026] 2. The oil collection tank component of this utility model has a simple structure and is easy to install. It can store more than 10mL of lubricating oil, and can meet the lubrication needs of the bearings even when the whole machine is stopped for a long time and then started to run at low speed.

[0027] 3. By equipping the input shaft bearing of the gearbox with an oil collection groove component, this utility model can prevent the bearing from dry friction. By protecting the bearing from damage, the service life of the gearbox can be prevented from being shortened due to premature wear of the bearing.

[0028] 4. The oil collection groove component of this utility model can be installed on the front and rear bearing mounting seats of the gearbox using bolts or screws without modifying the existing structure of the gearbox. Therefore, it can quickly upgrade existing gearbox products.

[0029] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of one embodiment of the oil collecting groove component proposed in this utility model;

[0032] Figure 2 It is Figure 1 The diagram shows a structural schematic of one embodiment in which the oil collection groove component is installed on a bearing mounting seat inside the gearbox.

[0033] Figure 3 This is a schematic diagram of one embodiment after oil collection groove components are installed on the front and rear bearing mounting seats inside the gearbox;

[0034] Figure 4 yes Figure 3 Enlarged longitudinal sectional view of part A in the figure.

[0035] In the diagram, 100 is the gearbox; 110 is the housing; 120 is the input shaft; 130 is the bearing mounting seat; 140 is the bearing; 141 is the outer ring; 142 is the inner ring; 143 is the rolling element; 200 is the oil collection groove component; 210 is the flange ring; 211 is the bolt hole; 212 is the bolt or screw; 220 is the oil collection groove ring; 230 is the outer edge ring; 240 is the outward flange; and 250 is the oil inlet. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "inner", "outer", "top", "bottom", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral molding, or an internal connection of components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0039] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] The gearbox is the core component of the power transmission system in a vehicle. For electric drive gearboxes, the main function is to adjust the output torque and speed of the motor to meet the high load requirements under complex working conditions.

[0041] like Figure 3 As shown, in the gearbox 100, rotating components such as the input shaft 120, bearings 140, and gear sets require lubrication during operation to reduce wear, dissipate heat to prevent overheating, and isolate oxygen to prevent metal corrosion. Therefore, during use, lubricating oil is injected into the internal cavity of the gearbox housing 110. The rotation of the input shaft 120 stirs up the lubricating oil, forming splashed droplets or mist that reach the mounting positions of different rotating components, thus lubricating them.

[0042] The input shaft 120 is mounted in the bearing mounting seat 130 inside the gearbox housing 110 via the bearing 140. In order to improve the stability of the input shaft 120 in the housing 110, a bearing mounting seat 130 is usually provided at the front end and the rear end inside the housing 110, and a bearing 140 is installed in each bearing mounting seat 130. The front and rear bearings 140 are used to support the front end and the rear end of the input shaft 120 respectively and guide the rotational movement of the input shaft 120.

[0043] Because the bearing 140 is installed relatively high in the gearbox housing 110, when the input shaft 120 rotates at low speed, the splash height of the lubricating oil is limited and often cannot reach the height of the bearing 140, which leads to poor lubrication or dry friction of the bearing 140.

[0044] To solve this problem, this embodiment designs an oil collection groove component 200, combined with... Figures 1 to 4As shown, it can be installed on the bearing mounting base 130 to collect and store the lubricating oil splashed to its height when the input shaft 120 is running at high speed; and to supply the stored lubricating oil to the bearing 140 when the input shaft 120 is running at low speed, so as to ensure that the bearing 140 is fully lubricated.

[0045] like Figure 1 As shown, the oil collecting groove component 200 in this embodiment has a semi-circular annular groove structure, including the flange ring section 210, the oil collecting groove ring section 220, the outer edge ring section 230 and other main components.

[0046] The flange ring segment 210 can be designed as a section of a circular ring with a central angle less than 180°, for example, about one-third of the ring. The difference between the outer and inner ring radii can be more than 3 cm, forming a ring surface with a width W1 of more than 3 cm. Screw holes 211 are formed on the ring surface, and bolts or screws 212 are installed in the screw holes 211. Figure 1 , Figure 4 As shown, the flange ring 210 is mounted on the bearing mounting base 130 by bolts or screws 212.

[0047] In some embodiments, multiple screw holes 311 can be formed on the annular surface of the flange ring segment 210, for example... Figure 1 The three screw holes 311 in the middle are arranged at equal intervals along the circumference, and a multi-point balanced force fixing method is adopted to improve the stability of the flange ring segment 210 on the bearing mounting seat 130.

[0048] The oil collecting groove annular segment 220 can be designed as a circular arc band with a certain width W2, such as... Figure 1 As shown, the width W2 can be determined according to the required lubricating oil storage capacity, for example, it can be configured between 3cm and 5cm. The arc length of the arc band is the same as the arc length of the inner ring of the oil collection groove ring 220 (that is, the central angle of the oil collection groove ring 220 is also less than 180°), and the flange ring 210 is configured to be located entirely below the oil collection groove ring 220 and perpendicular to the oil collection groove ring 220 (that is, the direction of the circumferential width W1 of the flange ring 210 is perpendicular to the direction of the arc width W2 of the oil collection groove ring 220). The center directions of the oil collection groove ring 220 and the flange ring 210 are set in the same direction. One of the two opposite arc edges in the oil collection groove ring 220 is connected to the inner ring of the flange ring 210, and the connection position is a smooth arc transition. The other arc edge of the oil collection groove ring 220 is connected to the outer ring 230.

[0049] In this embodiment, the outer ring segment 230 can also be designed as a section of a circular ring with a central angle less than 180°, for example, about one-third of the circular ring. The difference between the outer ring radius and the inner ring radius is the width W3 of the ring surface. The width W3 determines the oil storage height and can be calculated and determined based on the required oil storage volume and the arc width W2 of the oil collection groove ring segment 220.

[0050] The outer ring segment 230 is positioned above the oil collecting groove ring segment 220 and perpendicular to it (i.e., the width W3 of the outer ring segment 230 is perpendicular to the width W2 of the arc of the oil collecting groove ring segment 220). The outer ring segment 230 and the oil collecting groove ring segment 220 are aligned in the same direction, and the arc length of the outer ring of the outer ring segment 230 is the same as the arc length of the oil collecting groove ring segment 220. The outer ring of the outer ring segment 230 is connected to another arc edge of the oil collecting groove ring segment 220, with a smooth arc transition at the connection point, so that the flange ring segment 210, the oil collecting groove ring segment 220, and the outer ring segment 230 form a single unit.

[0051] In some embodiments, the oil collecting groove component 200 can be designed in an integral molding manner, that is, the flange ring segment 210, the oil collecting groove ring segment 220 and the outer edge ring segment 230 are integrally molded, the wall thickness of the three parts is equal, and they are transitioned by a smooth arc body with the same wall thickness.

[0052] An outer flange 240 can be further formed at the inner ring position of the outer ring segment 230, combined with... Figure 1 , Figure 4 As shown. The outer flange 240 transitions outward from the inner ring of the outer edge segment 230 in an arc shape, with the center of the arc facing downward and the arc line extending upward and away from the oil collection groove segment 220. By designing the outer flange 240 on the outer edge segment 230, the oil receiving area can be increased, and the lubricating oil splashed onto the outer flange 240 can be guided smoothly into the oil collection groove segment 220 for collection.

[0053] The oil collecting groove component 200 of this embodiment is installed onto the bearing mounting seat 130 of the gearbox 100, such as... Figure 3 As shown, it is specifically installed on one side of the front and rear bearing mounting seats 130 facing the center of the housing 110 (i.e., on the rear side of the front bearing mounting seat and the front side of the rear bearing mounting seat, respectively), and located at the bottom of the input shaft 120, with the opening facing upwards, forming a semi-encircling shape around the input shaft 120 from the bottom upwards, as shown. Figure 2 As shown, it is used to collect splashed lubricating oil.

[0054] Specifically, bolts 212 can be passed through the threaded holes 211 on the flange ring 210 in the oil collecting groove component 200 to thread the flange ring 210 onto the side of the bearing mounting seat 130 facing the center of the housing 110. The specific installation position should preferably meet the following requirements: First, the oil collecting groove ring 220 in the oil collecting groove component 200 should at least reach the outer ring 141 of the bearing 140 and be lower than the lowest position of the rolling elements inside the bearing 140; second, the outer edge ring 230 in the oil collecting groove component 200 should preferably have sufficient space between its highest point and the input shaft 120 to form an oil inlet 250, such as... Figure 4 As shown, this facilitates the introduction of lubricating oil splashed inside the gearbox housing 110 into the oil collection tank component 200 for storage.

[0055] In some embodiments, the center of the oil collecting groove annular segment 220 can be located on the axis of the input shaft 120, and the diameter of the oil collecting groove annular segment 220 can be larger than the diameter of the maximum circumference of the internal rolling element 143 of the bearing 140 but smaller than the outer diameter of the outer ring 141 of the bearing 140. Positioning the oil collecting groove annular segment 220 below the internal rolling element 143 of the bearing ensures that the lubricating oil collected in the oil collecting groove component 200 will not be completely lost through the internal rolling element 143 of the bearing. Even if the gearbox 100 is stopped for a long time, some lubricating oil will remain in the oil collecting groove component 200. Simultaneously, positioning the oil collecting groove annular segment 220 above the outer ring 141 of the bearing 140 avoids the situation where a large amount of lubricating oil is collected in the oil collecting groove component 200 (i.e., the lubricating oil is collected to a high height) before it flows to the internal rolling element 143 of the bearing. This ensures that the oil collecting groove component 200 in this embodiment can both store oil and supply oil to the bearing 140 in a timely manner.

[0056] In some embodiments, the center of the outer ring segment 230 can be configured to be located on the axis of the input shaft 120, and the inner diameter of the outer ring segment 230 can be configured to be larger than the outer diameter of the input shaft 120 and smaller than the diameter of the central circumference of the rolling element 143 inside the bearing, for example, located slightly downwards from the inner ring 142 of the bearing. This configuration, on the one hand, leaves sufficient space between the outer ring segment 230 and the input shaft 120 to form an oil inlet 250, allowing more of the splashed lubricating oil inside the gearbox housing 110 caused by the rotation of the input shaft 120 to flow into the oil collection groove component 200 for storage; on the other hand, by configuring the oil collection groove component 200 to have a certain depth, it can be ensured that the oil collection groove component 200 can store a sufficient amount of lubricating oil to provide adequate lubrication for the bearing 140.

[0057] The oil collection groove component 200 in this embodiment can store about 10mL of lubricating oil, which can meet the requirement of sufficient lubrication of the bearing 140 when the input shaft 120 is running at low speed for a long period of time.

[0058] Industrial applicability

[0059] When the oil collection groove component 200 of this embodiment is applied to a transmission employing splash lubrication, such as the transmission of an electric vehicle or a hybrid vehicle, when the input shaft 120 of the transmission 100 rotates at high speed, for example, when the speed reaches 2000 rpm or more, the lubricating oil in the transmission housing 110 is fully swept up by the high-speed rotating input shaft 120 and splashes throughout the entire housing 110. At this time, the lubricating oil splashed to the oil inlet 250 is guided by the outward flange 240 and flows into the oil collection groove component 200 for storage, while simultaneously lubricating the bearing 140 mounted on the input shaft 120.

[0060] When the input shaft 120 operates at low speed, the splash height of the lubricating oil may not reach the bearing 140. At this time, since a certain amount of lubricating oil is stored in the oil collection groove component 200, the lubricating oil stored in the oil collection groove component 200 can be supplied to the bearing 140 to continue lubricating the bearing 140 and ensure that the bearing 140 is adequately lubricated.

[0061] When the vehicle is parked for an extended period, some of the lubricating oil stored in the oil collection tank 200 will leak out through the rolling elements 143 inside the bearing 140. When the vehicle is started again at a low speed, the slowly rotating input shaft 120 can pick up the lubricating oil remaining in the oil collection tank 200 and splash it onto the input shaft bearing 140 to prevent dry friction of the bearing 140, thus providing sufficient protection for the bearing 140.

[0062] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model 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; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A sump member for lubricating a bearing, characterized by, include: Flange ring section, which is a section shaped like a ring, is used for mounting on a bearing mounting base; The oil collecting groove annular segment is perpendicular to the flange annular segment and is located above the flange annular segment; the shape of the oil collecting groove annular segment is an arc band with two opposite arc edges, one of which is connected to the inner ring of the flange annular segment. The outer ring segment is perpendicular to the oil collecting groove ring segment and is located above the oil collecting groove ring segment; the outer ring segment is a section of a circle, and the outer ring is connected to another arc edge of the oil collecting groove ring segment.

2. The sump member for lubricating a bearing according to claim 1, characterized by, An outwardly flange is formed on the inner ring of the outer edge segment, which is formed in an upward arc transitioning away from the oil collection groove segment.

3. The sump member for lubricating a bearing according to claim 1, characterized by, Several screw holes are provided on the flange ring section for mounting the flange ring section on the bearing mounting base by means of bolts.

4. The oil collecting groove component for lubricating bearings according to any one of claims 1 to 3, characterized in that, The flange ring section, oil collection groove ring section and outer edge ring section are integrally formed, and the connection parts are rounded.

5. A sump member for lubricating a bearing according to claim 4, wherein The flange ring section, oil collection groove ring section and outer edge ring section have the same center direction and the central angle is less than 180°.

6. A gearbox comprising a housing, a bearing mounting provided in the housing, a bearing mounted on the bearing mounting, the bearing being rotatably mounted with an input shaft; characterized in that, An oil collection groove component for lubricating the bearing, as described in any one of claims 1 to 5, is installed on the inner side of the bearing mounting base facing the center of the housing.

7. The gearbox according to claim 6, characterized in that The oil collection groove component is located at the bottom of the input shaft, with its opening facing upwards, and surrounds the area below the input shaft.

8. The gearbox of claim 7, wherein, The center of the oil collecting groove annular segment is located on the axis of the input shaft. The diameter of the oil collecting groove annular segment is larger than the diameter of the largest circumference of the internal rolling element of the bearing and smaller than the outer diameter of the outer ring of the bearing.

9. The gearbox of claim 8, wherein, The center of the outer ring segment is located on the axis of the input shaft, and the inner diameter of the outer ring segment is greater than the outer diameter of the input shaft and smaller than the diameter of the central circumference of the internal rolling element of the bearing. An oil inlet is formed between the outer ring segment and the input shaft to introduce the lubricating oil splashed in the housing into the oil collection groove ring segment for storage.

10. The gearbox according to any one of claims 6 to 9, characterized in that, The housing contains two bearing mounting seats, one at the front and one at the rear. Each bearing mounting seat contains one bearing, and the two bearings are rotatably assembled with the front and rear ends of the input shaft, respectively. Each bearing mounting seat contains one oil collection groove component.

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