Reducer lubrication system

Abstract

The present application provides a speed reducer lubrication system, which includes a housing, a central gear, a planet carrier, a ring gear, an annular oil baffle and a forced lubrication unit. The housing is provided with a first bearing and a second bearing. The central gear is rotatably arranged in the housing. The planet carrier is connected to both the first bearing and the second bearing at the same time; the planet carrier is provided with a planet gear assembly having a first oil delivery hole. The ring gear is connected to the housing, and the planet gears are meshed with the ring gear. The annular oil baffle is connected to the planet carrier, and the forced lubrication unit is configured to force lubricating oil into the first bearing. At least part of the first bearing is located in the area surrounded by the annular oil baffle, so that the lubricating oil leaving the first bearing falls into the annular oil baffle. The annular oil baffle is used to press the lubricating oil into the first oil delivery hole during rotation, and the lubricating oil in the first oil delivery hole can sequentially enter the planet gear assembly and the second bearing. The lubrication effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of lubrication, and more particularly, to a lubrication system for a speed reducer housing. Background Art

[0002] Most of the planetary speed reducers used in vehicles are splash lubricated. With the development of new energy vehicles, the motor speed is getting higher and higher. If there is too much oil in the gearbox, the oil stirring loss of the gearbox will be very obvious, seriously affecting the transmission efficiency; if there is too little oil in the gearbox, at high speeds, the planetary gears will stir up most of the lubricating oil, filling the entire gearbox, and the lubricating oil attached to the gears will be thrown off the tooth surfaces under the action of high-speed centrifugal force, making it difficult to provide sufficient lubricating oil for the gear meshing positions.

[0003] The inventors have found through research that the existing speed reducer has the following disadvantages:

[0004] Poor lubrication effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a lubrication system for a speed reducer housing, which can improve the lubrication effect.

[0006] The embodiments of the present invention are implemented as follows:

[0007] In a first aspect, the present invention provides a lubrication system for a speed reducer housing, comprising:

[0008] A housing, the housing is provided with a first bearing hole and a second bearing hole, and a first bearing and a second bearing are respectively arranged in the first bearing hole and the second bearing hole;

[0009] A forced lubrication unit configured to force lubricating oil into the first bearing;

[0010] A central gear, the central gear is rotatably arranged on the housing;

[0011] A planet carrier, the planet carrier is simultaneously connected to the first bearing and the second bearing; the planet carrier is provided with a planet gear assembly having a first oil delivery hole;

[0012] A ring gear, the ring gear is connected to the housing, and the planet gear assembly is simultaneously meshed with the ring gear and the central gear;

[0013] And an annular oil baffle, the annular oil baffle is connected to the planet carrier, at least a part of the first bearing is located in the area surrounded by the annular oil baffle, so that the lubricating oil leaving the first bearing falls into the annular oil baffle, and the annular oil baffle is used to press the lubricating oil into the first oil delivery hole during rotation, and the lubricating oil in the first oil delivery hole can sequentially enter the planet gear assembly and the second bearing.

[0014] In an alternative embodiment, the annular oil baffle includes a connected plate body and a positioning tube. The plate body is connected to the planet carrier, and the positioning tube is inserted into the first oil delivery hole. The lubricating oil contained in the plate body can enter the positioning tube under the action of centrifugal force.

[0015] In an alternative embodiment, the plate body has an arc-shaped guiding surface. The arc-shaped guiding surface extends in a necking shape from the outside to the inside away from the first oil delivery hole, and is used to guide the lubricating oil delivered from the forced lubrication unit to the first bearing into the positioning tube.

[0016] In an alternative embodiment, the central gear is provided with a second oil delivery hole and a central oil delivery hole. The oil delivery directions of the central oil delivery hole and the second oil delivery hole have an included angle. Lubricating oil can enter the second oil delivery hole and the central oil delivery hole through the forced lubrication unit. The second oil delivery hole is used to deliver the lubricating oil to the first bearing, and the central oil delivery hole is used to deliver the lubricating oil to the planet gear assembly.

[0017] In an alternative embodiment, the planet gear assembly includes a planet gear and a pin shaft. The first oil delivery hole is provided on the pin shaft, and the pin shaft is fixedly connected to the planet carrier. The planet gear includes a first gear body and a second gear body arranged coaxially. Both the first gear body and the second gear body are sleeved outside the pin shaft. The first gear body meshes with the central gear, and the second gear body meshes with the ring gear.

[0018] In an alternative embodiment, the planet carrier is provided with a first guiding inclined surface and a second guiding inclined surface. The first guiding inclined surface and the second guiding inclined surface have an included angle. The first guiding inclined surface is used to guide the lubricating oil output from the central oil delivery hole to the first gear body; the second guiding inclined surface is used to guide the lubricating oil output from the central oil delivery hole to the second gear body.

[0019] In an alternative embodiment, the first oil delivery hole includes a main delivery section and a plurality of auxiliary delivery sections. One end of the main delivery section extends to the end face of the pin shaft, and one end of each of the plurality of auxiliary delivery sections is communicated with the main delivery section, and the other end extends to the outer peripheral surface of the pin shaft.

[0020] In an alternative embodiment, a third oil delivery hole is provided on the planet carrier, and the third oil delivery hole is used to guide the lubricating oil flowing through the planet gear assembly to the position where the second bearing is located.

[0021] In an alternative embodiment, an oil drain hole is provided at the bottom of the housing, and the oil drain hole controls the oil level of the lubricating oil inside the housing to float at the lowest positions of the planet gear assembly and the annular oil baffle.

[0022] In an alternative embodiment, the housing has a lid and a body connected to each other, and the second bearing hole is provided on the body; the lid has an integral central cylinder portion, a first annular plate portion, a second annular plate portion and a third annular plate portion. The first annular plate portion is parallel to the second annular plate portion. The inner edge of the second annular plate portion is connected to the first annular plate portion, and the outer edge of the second annular plate portion is connected to the third annular plate portion. The second annular plate portion forms an angle with both the first annular plate portion and the third annular plate portion. The first bearing hole is provided on the central cylinder portion; the oil drain hole is provided at the outer edge of the third annular plate portion; the cross-sectional area of the inner wall surface of the second annular plate portion gradually decreases in a direction away from the planet carrier, and there is a gap between the second annular plate portion and the planet carrier to define an annular passage; wherein, the cross-section is a plane perpendicular to the first bearing hole.

[0023] The beneficial effects of the embodiments of the present invention are as follows:

[0024] In summary, the reduction gear lubrication system provided in this embodiment is applied to a high-speed electric vehicle reduction gear. During use, lubricating oil is input from the second oil delivery hole of the central gear. Under the action of centrifugal force, part of the lubricating oil flows in the second oil delivery hole, and the lubricating oil output from the second oil delivery hole enters the position where the first bearing is located to lubricate the first bearing; at the same time, after passing through the first bearing, the lubricating oil discharged from the first bearing falls into the area surrounded by the annular oil baffle. During the rotation of the annular oil baffle, the lubricating oil is pressed into the first oil delivery hole, and the lubricating oil is delivered from the first oil delivery hole to the position where the planet gear assembly is located to lubricate the planet gear assembly. It should be understood that part of the lubricating oil can flow in the housing to lubricate the meshing positions of the central gear and the planet gear and the meshing positions of the planet gear and the ring gear. In this way, the gears and bearings inside the gearbox can be effectively lubricated, the performance of the gearbox is stable, and the service life is long.

[0025] At the same time, since the lubricating oil in the annular oil baffle mainly comes from the lubricating oil falling from the first bearing, compared with the prior art method of scooping up the lubricating oil by the oil baffle, it can reduce the agitation of the rotating parts and the lubricating oil without lubrication effect, avoid the temperature rise of the lubricating oil caused by this part of the collision, and at the same time reduce the running resistance of the gears. Moreover, directly pouring oil into the annular oil baffle has a larger oil inlet volume than scooping oil by the oil baffle, with a high utilization rate of the lubricating oil and better lubrication effect. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant accompanying drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of the speed reducer lubrication system according to the embodiment of the present invention;

[0028] Figure 2 For Figure 1 Partial enlarged structural schematic diagram in

[0029] Figure 3 Structural schematic diagram of the pin shaft according to the embodiment of the present invention.

[0030] Icon:

[0031] 001 - Identification line; 100 - Housing; 110 - First bearing; 120 - Second bearing; 130 - Central barrel part; 140 - First annular plate part; 150 - Second annular plate part; 160 - Third annular plate part; 170 - Annular channel; 200 - Central gear; 210 - Second oil delivery hole; 220 - Central oil delivery hole; 300 - Planet carrier; 310 - First guiding inclined surface; 320 - Second guiding inclined surface; 330 - Third oil delivery hole; 340 - Third bearing; 350 - Oil drain hole; 400 - Pin shaft; 410 - First oil delivery hole; 411 - Main delivery section; 412 - Auxiliary delivery section; 500 - Planet gear; 510 - First gear body; 520 - Second gear body; 600 - Ring gear; 700 - Annular oil baffle; 710 - Arc guiding surface; 720 - Plate body; 730 - Positioning tube. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] At present, splash lubrication is adopted for the gearbox of high-speed electric vehicles. That is, after the lubricating oil is input into the gearbox, the centrifugal force generated by the gears and the planet carrier 300 during the operation of the gearbox drives the lubricating oil to flow in the gearbox to achieve lubrication. Since the rotational speed is high during the operation of the gearbox of high-speed electric vehicles, the lubricating oil is basically on the outer periphery, and the lubrication effect is not good.

[0039] In view of this, the designer has designed a lubrication system for the reduction gearbox, which can accurately deliver the lubricating liquid to the position to be lubricated, and has a good lubrication effect.

[0040] Please refer to Figure 1, in this embodiment, the reduction gear lubrication system includes a housing 100, a central gear 200, a planet carrier 300, a pin shaft 400, planet gears 500, a ring gear 600, an annular oil baffle 700, and a forced lubrication unit (not shown in the figure). The housing 100 is provided with a first bearing 110 hole and a second bearing 120 hole, and a first bearing 110 and a second bearing 120 are respectively arranged in the first bearing 110 hole and the second bearing 120 hole. The central gear 200 is rotatably arranged on the housing. The planet carrier 300 is connected to both the first bearing 110 and the second bearing 120 at the same time. The pin shaft 400 is fixedly connected to the planet carrier 300, a third bearing 340 is sleeved outside the pin shaft 400, and the pin shaft 400 is provided with a first oil delivery hole 410. The planet gears 500 are sleeved outside the third bearing 340 and mesh with the central gear 200. The ring gear 600 is connected to the housing 100, and the planet gears 500 mesh with the ring gear 600. The annular oil baffle 700 is connected to the planet carrier 300. The forced lubrication unit is configured to force lubricating oil into the first bearing 110. At least part of the first bearing 110 is located in the area surrounded by the annular oil baffle 700, so that the lubricating oil leaving the first bearing 110 falls into the annular oil baffle 700. The annular oil baffle 700 is used to press the lubricating oil into the first oil delivery hole 410 during rotation, and the lubricating oil in the first oil delivery hole 410 can sequentially enter the planet gear assembly and the second bearing 120.

[0041] It should be understood that the pin shaft 400 and the planet gears 500 can be called the planet gear assembly.

[0042] The working principle of the gearbox lubrication system provided in this embodiment is as follows:

[0043] The reduction gear lubrication system provided in this embodiment is applied to a high-speed electric vehicle reduction gear. When in use, the lubricating oil is forced into the first bearing 110 by the forced lubrication unit to lubricate the first bearing 110. At the same time, after the lubricating oil passes through the first bearing 110, please combine Figure 2 with the identification line 001 in it, and it can be clearly obtained that the lubricating oil discharged from the first bearing 110 can smoothly fall into the area surrounded by the annular oil baffle 700. During the rotation of the annular oil baffle 700, the lubricating oil is pressed into the first oil delivery hole 410, and the lubricating oil is conveyed from the first oil delivery hole 410 to the position where the planet gear assembly is located to lubricate the planet gear assembly. It should be understood that part of the lubricating oil can flow in the housing 100 to lubricate the meshing positions of the central gear 200 and the planet gears 500 and the meshing positions of the planet gears 500 and the ring gear 600. In this way, the gears and bearings inside the gearbox can be effectively lubricated, the performance of the gearbox is stable, and the service life is long.

[0044] Meanwhile, since the lubricating oil in the annular oil baffle 700 mainly comes from the oil falling from the first bearing 110, compared with the prior art method of scooping up the lubricating oil by the oil baffle, it can reduce the agitation of the rotating components and the lubricating oil without lubrication effect, avoid the temperature rise of the lubricating oil caused by this part of the collision, reduce the running resistance of the gears at the same time, and directly pouring oil into the annular oil baffle 700 has a larger oil inlet volume than scooping oil by the oil baffle, with a high utilization rate of the lubricating oil and better lubrication effect.

[0045] Among them, the forced lubrication unit provides a pressure difference for the circulation of the lubricating oil through an oil pump, so that the lubricating oil can be forced into the first bearing 110.

[0046] In this embodiment, optionally, the housing 100 includes a box body and a box cover. The box body has two opposite openings. The box cover is fixedly connected to the box body by bolts. The box cover is located at one of the openings. A hole for the first bearing 110 is provided on the box cover, and a part of the box body away from the opening of the box cover is provided as a hole for the second bearing 120. The box body and the box cover are detachably connected by bolts. The connection method is simple and reliable, convenient for assembly, and low in cost.

[0047] Furthermore, an oil drain hole 350 is provided on the box cover. The oil drain hole 350 controls the oil level of the lubricating oil inside the housing 100 to float at the lowest positions of the planetary gear assembly and the annular oil baffle 700. When the gearbox is operating normally, the oil drain hole 350 is located at the lower part of the box cover, which can make the lubricating oil inside the housing 100 flow back to the fuel tank, so as to take away the heat by the lubricating oil. At the same time, the oil drain hole 350 effectively reduces the oil level of the lubricating oil inside the housing 100, avoids excessive agitation of the lubricating oil by the planet carrier 300, the planetary gear assembly and the annular oil baffle 700, reduces the probability of high-temperature hidden danger of the lubricating oil, reduces the running resistance of the internal structure of the speed reducer at the same time, and improves the transmission efficiency.

[0048] Optionally, the lid has an integral central cylinder portion 130, a first annular plate portion 140, a second annular plate portion 150, and a third annular plate portion 160. The first annular plate portion 140 is parallel to the second annular plate portion 150. The inner edge of the second annular plate portion 150 is smoothly connected to the first annular plate portion 140, and the outer edge of the second annular plate portion 150 is smoothly connected to the third annular plate portion 160. The second annular plate portion 150 forms an angle with both the first annular plate portion 140 and the third annular plate portion 160, that is, the second annular plate portion 150 is inclined relative to both the first annular plate portion 140 and the third annular plate portion 160. The hole of the first bearing 110 is provided on the central cylinder portion 130. The oil drain hole 350 is provided on the outer edge of the third annular plate portion 160. The cross-sectional area of the inner wall surface of the second annular plate portion 150 gradually decreases in the direction away from the planet carrier 300, that is, the edge of the second annular plate portion 150 connected to the third annular plate portion 160 is recessed inward compared to the edge connected to the first annular plate portion 140. There is a spacing between the second annular plate portion 150 and the planet carrier 300 to define an annular channel 170; wherein, the cross-section is a plane perpendicular to the hole of the first bearing 110. At the same time, the positive projection of the side surface of the planet carrier 300 close to the hole of the first bearing 110 in the direction perpendicular to the axis of the hole of the first bearing 110 is located between the inner wall surface of the first annular plate portion 140 and the inner wall surface of the third annular plate portion 160. With such a design, when the vehicle bumps or the gear rotates at a high speed, the oil at the bottom of the housing 100 will not easily overflow the annular channel 170 and soak the annular oil baffle 700. The structural design of the second annular plate portion 150 can effectively buffer the lubricating oil after the large circulation and cooperate with the oil drain hole 350 to stabilize the oil level.

[0049] In this embodiment, optionally, a second oil delivery hole 210 and a central oil delivery hole 220 are provided on the central gear 200. There is an included angle between the oil delivery directions of the central oil delivery hole 220 and the second oil delivery hole 210. The cross-section of the central oil delivery hole 220 is circular, and the axis of the central oil delivery hole 220 is collinear with the axis of the central gear 200. Moreover, the central oil delivery hole 220 is set as a variable-diameter hole, and the diameters of the two orifices of the central oil delivery hole 220 are different. The diameter of the end of the central oil delivery hole 220 for inputting lubricating oil is larger than that of the other end. That is to say, the lubricating oil is input from the orifice with a larger diameter of the central oil delivery hole 220 and output from the orifice with a smaller diameter. In this way, the ejection speed of the lubricating oil can be increased, so that the lubricating oil can reach the set position smoothly. The second oil delivery hole 210 is communicated with the central oil delivery hole 220, and the axis of the second oil delivery hole 210 extends along the radial direction of the central gear 200. During the operation of the gearbox, the lubricating oil is input from one end of the central oil delivery hole 220. Part of the lubricating oil is directly output from the other end of the central oil delivery hole 220, and part of the lubricating oil is output from the second oil delivery hole 210. The lubricating oil output from the second oil delivery hole 210 enters the position where the first bearing 110 is located, so as to lubricate different positions. That is to say, the forced lubrication unit can force the lubricating oil into the central oil delivery hole 220 and the second oil delivery hole 210.

[0050] In this embodiment, optionally, the planet carrier 300 is provided with a first guiding inclined surface 310 and a second guiding inclined surface 320, and there is an included angle between the first guiding inclined surface 310 and the second guiding inclined surface 320. The planet carrier 300, the box body and the box cover jointly define a chamber for accommodating lubricating oil. An oil seal is provided between the side of the planet carrier 300 away from the box cover and the box body. The number of the first guiding inclined surfaces 310 and the second guiding inclined surfaces 320 can both be set to be multiple, and the multiple first guiding inclined surfaces 310 and the multiple second guiding inclined surfaces 320 are alternately arranged in the circumferential direction of the rotation axis of the planet carrier 300. A fixing hole is provided on the planet carrier 300, and the pin shaft 400 is inserted into the fixing hole and fixedly connected to the planet carrier 300. The end with a smaller diameter of the central oil delivery hole 220 of the central gear 200 faces the planet carrier 300. After the lubricating oil output from the central oil delivery hole 220 reaches the planet carrier 300, it is blocked by the planet carrier 300 and can contact the first guiding inclined surface 310 and the second guiding inclined surface 320 of the planet carrier 300. Under the guidance of the first guiding inclined surface 310 and the second guiding inclined surface 320, the lubricating oil is guided in different directions, so as to directly lubricate different positions in the gearbox, and the lubrication effect is good.

[0051] Further, a third oil delivery hole 330 is also provided on the planet carrier 300. After the lubricating oil reaching the third bearing 340 from the first oil delivery hole 410 passes through the third bearing 340, it can enter the third oil delivery hole 330 and reach the position where the ring gear 600 is located, so as to assist in lubricating the meshing position of the ring gear 600 and the planet gears 500. In addition, the third oil delivery hole 330 can also be designed as an internal threaded blind hole for positioning, and the pin shaft 400 is fastened by a bolt.

[0052] Optionally, the planet gear 500 includes a first gear body 510 and a second gear body 520 arranged coaxially. The first gear body 510 and the second gear body 520 are of an integral structure and are both sleeved outside the third bearing 340. The first gear body 510 meshes with the central gear 200, and the second gear body 520 meshes with the ring gear 600. When the gearbox operates, the first guiding inclined surface 310 is used to guide the lubricating oil output from the central oil delivery hole 220 to the first gear body 510, so as to lubricate the meshing position of the first gear body 510 and the central gear 200. The second guiding inclined surface 320 is used to guide the lubricating oil output from the central oil delivery hole 220 to the second gear body 520, so as to lubricate the meshing position of the second gear body 520 and the ring gear 600.

[0053] Please refer to Figure 3 , in this embodiment, optionally, the first oil delivery hole 410 on the pin shaft 400 is set as a multi-section type. For example, the first oil delivery hole 410 includes a main delivery section 411 and a plurality of auxiliary delivery sections 412. One end of the main delivery section 411 extends to the end face of the pin shaft 400 close to the box cover, one ends of the plurality of auxiliary delivery sections 412 are all communicated with the main delivery section 411, and the other ends all extend to the outer peripheral surface of the pin shaft 400. There is a distance between one end of the pin shaft 400 close to the box cover and the box cover, so as to facilitate the lubricating oil flowing out from the second oil delivery hole 210 to flow to the first oil delivery hole 410. And the lubricating oil enters from the main delivery section 411 and is output from the plurality of auxiliary delivery sections to lubricate the third bearing 340.

[0054] In this embodiment, optionally, the annular oil baffle 700 has an arc-shaped guiding surface 710. The arc-shaped guiding surface 710 is located on the side of the annular oil baffle 700 close to the pin shaft 400 and is used to guide the lubricating oil delivered from the second oil delivery hole 210 to the first bearing 110 into the main delivery section 411 of the first oil delivery hole 410.

[0055] Please refer to Figure 2, Further, the annular oil baffle 700 includes a connected plate body 720 and a positioning pipe 730. Both the plate body 720 and the positioning pipe 730 are annular. The arc-shaped guiding surface 710 is provided on the plate body 720, that is, a part of one surface of the plate body 720 is set as the arc-shaped guiding surface 710. The plate body 720 is connected to the planet carrier 300, and the positioning pipe 730 is inserted into the first oil delivery hole 410; the arc-shaped guiding surface 710 on the plate body 720 is used to guide the lubricating oil, that is, the lubricating oil contained in the plate body 720 can smoothly enter the positioning pipe 730 along the arc-shaped guiding surface 710 under the action of centrifugal force. Optionally, the plate body 720 and the planet carrier 300 can be fixedly connected by screws.

[0056] The reduction gear lubrication system provided in this embodiment has good lubrication effect during the operation of the gearbox, is not prone to failures, and is safe and reliable.

[0057] This embodiment also provides a high-speed electric vehicle reduction gearbox, including the reduction gear lubrication system of the above embodiment. During the operation of the reduction gearbox, the lubricating oil can fully reach the positions where each component inside the gearbox is located, and the lubrication effect is good.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A speed reducer lubrication system, characterized in that, Comprising: A housing, the housing is provided with a first bearing hole and a second bearing hole, and a first bearing and a second bearing are respectively arranged in the first bearing hole and the second bearing hole; A forced lubrication unit configured to force lubricating oil into the first bearing; A central gear, the central gear is rotatably arranged on the housing; A planet carrier, the planet carrier is connected to the first bearing and the second bearing at the same time; the planet carrier is configured with a planet gear assembly having a first oil delivery hole; A ring gear, the ring gear is connected to the housing, and the planet gear assembly is meshed with the ring gear and the central gear at the same time; And an annular oil baffle, the annular oil baffle is connected to the planet carrier, at least part of the first bearing is located in the area surrounded by the annular oil baffle, so that the lubricating oil leaving the first bearing falls into the annular oil baffle, and the annular oil baffle is used to press the lubricating oil into the first oil delivery hole during rotation, and the lubricating oil in the first oil delivery hole can sequentially enter the planet gear assembly and the second bearing; The annular oil baffle includes a connected plate body and a positioning tube, the plate body is connected to the planet carrier, and the positioning tube is inserted into the first oil delivery hole; the lubricating oil contained in the plate body can enter the positioning tube under the action of centrifugal force; The central gear is provided with a second oil delivery hole and a central oil delivery hole, and the oil delivery directions of the central oil delivery hole and the second oil delivery hole have an included angle. The lubricating oil can enter the second oil delivery hole and the central oil delivery hole through the forced lubrication unit. The second oil delivery hole is used to deliver the lubricating oil to the first bearing, and the central oil delivery hole is used to deliver the lubricating oil to the planet gear assembly; The planet gear assembly includes a planet gear and a pin shaft, the first oil delivery hole is arranged on the pin shaft, and the pin shaft is fixedly connected to the planet carrier; the planet gear includes a first gear body and a second gear body arranged coaxially, both the first gear body and the second gear body are sleeved outside the pin shaft, the first gear body is meshed with the central gear, and the second gear body is meshed with the ring gear; The planet carrier is provided with a first guiding inclined surface and a second guiding inclined surface, and the first guiding inclined surface and the second guiding inclined surface have an included angle. The first guiding inclined surface is used to guide the lubricating oil output from the central oil delivery hole to the first gear body; the second guiding inclined surface is used to guide the lubricating oil output from the central oil delivery hole to the second gear body.

2. The speed reducer lubrication system according to claim 1, wherein: The plate body has an arc-shaped guiding surface, and the arc-shaped guiding surface extends in a necking shape from the outside to the inside on the side away from the first oil delivery hole, and is used to guide the lubricating oil delivered from the forced lubrication unit to the first bearing into the positioning tube.

3. The speed reducer lubrication system according to claim 1, wherein: The first oil delivery hole includes a main delivery section and a plurality of auxiliary delivery sections. One end of the main delivery section extends to the end surface of the pin shaft, and one end of each of the plurality of auxiliary delivery sections is communicated with the main delivery section, and the other end extends to the outer peripheral surface of the pin shaft.

4. The speed reducer lubrication system according to claim 1, wherein: A third oil delivery hole is provided on the planet carrier, and the third oil delivery hole is used to guide the lubricating oil flowing through the planet gear assembly to the position where the second bearing is located.

5. The speed reducer lubrication system according to claim 1, wherein: An oil drain hole is provided at the bottom of the housing, and the oil drain hole controls the oil level of the lubricating oil inside the housing to float at the lowest positions of the planet gear assembly and the annular oil baffle.

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