A method for splash lubrication of transmission bearing and oil channel structure

Abstract

The present invention discloses a method and oil channel structure for splash lubrication of transmission bearings, characterized in that: it includes a splash oil chamber and a distribution oil channel; the splash oil chamber is formed by a front baffle plate arranged in front of the main reduction gear, a rear baffle plate arranged behind the main reduction gear, and a housing in front of the transmission below and on the right side of the main reduction gear; a splash notch 1 is arranged above the splash oil chamber, and a splash notch 2 is arranged on the inner wall of the housing in front of the splash oil chamber; the oil channel includes oil channel 1 and oil channel 2, and both oil channel 1 and oil channel 2 have an oil receiving start end and an oil delivery terminal; the oil delivery terminal of oil channel 1 includes a rear bearing position of an output shaft, a rear bearing position of an intermediate shaft, and a front bearing position of an intermediate shaft, and its oil receiving start end is located at the first splash notch; the oil delivery terminal of oil channel 2 includes a front half-shaft bearing position and a rear half-shaft bearing position of a differential, and its oil receiving start end is located at the second splash notch. The advantages of the invention are that the amount of lubricating oil distributed to the bearing positions of each target bearing is large and the supply is stable.

Description

Technical Field

[0001] The invention relates to transmission bearing lubrication, and in particular to a method for splash lubrication of a transmission bearing and an oil channel structure, belonging to the field of automobile reduction equipment. Background Art

[0002] The common feature of new energy transmissions is high speed, which is basically above 10,000 rpm. It is very important to fully lubricate the gears and bearings with lubricating oil. It is the main factor to prevent the gears and bearings from burning due to excessive temperature during the high-speed operation of the transmission. Since the main reduction gear is relatively large, part of it is immersed in lubricating oil. During the operation of the transmission, the lubricating oil can be brought to the meshing gears. Therefore, the lubrication of the bearings is the main consideration for the lubrication of new energy transmissions.

[0003] At present, when new energy transmissions are lubricated by splash lubrication, the lubrication of the bearings is generally done by adding lubricating oil baffle ribs on the inner wall of the housing and opening oil guide grooves to the bottom of the circular hole-shaped bearing position. The splashed lubricating oil is intercepted and collected, and then drained to the bottom of the bearing position by the oil guide groove to lubricate the bearing. The defect is that the baffle ribs are generally located at a dispersed oil end splashing position far away from the splash center, and are blocked by other components in the housing. The oil accumulation effect is limited, and there is insufficient lubrication for the lubricated bearings. In addition, the opening of the oil guide groove destroys the integrity of the hole wall of the circular hole-shaped bearing position, and its inherent force structure is weakened. When the shaft rotates, facing a sudden increase in load, there is a risk of the housing cracking. Summary of the invention

[0004] The main problem to be solved by the present invention is that the conventional lubrication structure for bearing lubrication in the transmission housing has the problem of insufficient and unstable lubricating oil supply.

[0005] In view of the above problems, the technical solution proposed by the present invention is:

[0006] A method for splash lubrication of transmission bearings is to construct a splash oil chamber in the area where lubricating oil is concentratedly splashed in the transmission housing, and to construct a distribution oil channel, so that the lubricating oil from the splash oil chamber is directly transported to the bearing positions of each target bearing through the distribution oil channel.

[0007] Furthermore, the splash oil chamber is constructed in the area where the lubricating oil is concentratedly splashed in the transmission case by arranging retaining components in front of and behind the main reduction gear, and a closed space is formed by the two retaining components and the inner wall of the transmission front case between the two retaining components to limit the splashing oil from scattering outward, and a notch is arranged on the splash oil chamber to drain the splashing oil to the outside of the splash oil chamber; the distribution oil channel is constructed by adding an oil groove in the transmission case and opening an oil groove and an oil hole on the case, so that the lubricating oil drained from the splash oil chamber can flow to the bottom of the bearing position of each bearing in the transmission case that needs oil supply.

[0008] An oil channel structure for splash lubrication of a transmission bearing designed according to the method described in claim 1, characterized in that it includes a splash oil chamber and an oil distribution channel; the splash oil chamber is formed by a front baffle plate arranged in front of the main reduction gear, a rear baffle plate arranged behind the main reduction gear, and a shell in front of the transmission below and on the right side of the main reduction gear; a splash notch 1 is arranged above the splash oil chamber, and a splash notch 2 is arranged on the inner wall of the shell in front of the splash oil chamber; the oil channel includes oil channel 1 and oil channel 2, and both oil channel 1 and oil channel 2 have an oil receiving starting end and an oil delivery terminal; the oil delivery terminal of oil channel 1 includes a rear bearing position of the output shaft, a rear bearing position of the intermediate shaft, and a front bearing position of the intermediate shaft, and its oil receiving starting end is located at the first splash notch; the oil delivery terminal of oil channel 2 includes a front half-shaft bearing position and a rear half-shaft bearing position of the differential, and its oil receiving starting end is located at the second splash notch.

[0009] Furthermore, the oil channel one includes a sub-oil guide groove, which has an oil receiving port located at the right end of the sub-oil guide groove, an oil guide groove located in the middle section of the sub-oil guide groove, a rear oil guide groove located at the left end of the sub-oil guide groove and bent to the left and rear, and a forward oil guide groove located at the left end of the sub-oil guide groove and bent to the left and front; the oil receiving port is the oil receiving starting end of the oil channel one, facing the splash oil chamber on the right and catching the lubricating oil powder thrown out from the splash oil chamber to the left along the tangent of the main reduction gear.

[0010] Furthermore, the oil passage 1 also includes a rear oil passage, which includes a rear oil groove, a rear oil hole 1 and a rear oil hole 2; the groove opening of the rear oil groove is located below the rear port of the rear oil guide groove, on the rear housing above the intermediate shaft rear bearing position and the output shaft rear bearing position; the rear oil hole 1 leads obliquely from the rear oil groove to the bottom of the intermediate shaft rear bearing position, and the rear oil hole 2 leads obliquely from the rear oil groove to the bottom of the output shaft rear bearing position.

[0011] Furthermore, a fixing pin extending backward is provided beside the rear port of the rear oil guide groove, and correspondingly, a positioning hole capable of inserting the fixing pin is provided beside the notch of the rear oil guide groove.

[0012] Furthermore, the oil channel 1 also includes a front oil channel, which includes a front oil connecting groove and a front oil hole. The front oil connecting groove is opened on the inner wall of the front shell body, one end of which is located below the port of the forward oil guide groove, and the other end is located above the front bearing position of the intermediate shaft. The front oil hole extends obliquely from the front oil connecting groove to the bottom of the front bearing position of the intermediate shaft.

[0013] Furthermore, the splash gap 2 includes an oil cut-off port, an oil cut-off plate and an oil collecting port. The oil cut-off port is opened on the inner wall of the front shell body on the right side of the splash oil chamber to swallow the oil powder thrown out along the tangent of the main reduction gear. The oil cut-off plate is located in the oil cut-off port, one end of which is connected to the upper side of the oil cut-off port, and the other end is bent to the lower right, forming an oil collecting port with the end of a surface extending to the right from the lower side of the oil cut-off port.

[0014] Furthermore, the oil channel 2 includes an oil receiving groove, a front branch channel leading to the front half-shaft bearing position, and a rear branch channel leading to the rear half-shaft bearing position. The oil receiving groove is located below the oil collecting port of the splash notch 2, and its front end is connected to the front branch channel, and its rear end is connected to the rear branch channel.

[0015] Further, the front branch flow channel includes a front branch oil receiving hole, a front branch oil groove and a front branch oil hole, the upper end of the front branch oil receiving hole is communicated with the front end of the oil receiving groove, and the lower end thereof is communicated with the rear end of the front branch oil groove, the upper end of the front branch oil hole is communicated with the front end of the front branch oil groove, and the lower end thereof is communicated with the bottom of the front half-shaft bearing position of the differential; the rear branch flow channel includes a rear branch oil receiving hole, a rear branch oil groove and a rear branch oil hole, the upper end of the rear branch oil receiving hole is communicated with the rear end of the oil receiving groove, and the lower end thereof is communicated with the front end of the rear branch oil groove, the upper end of the rear branch oil hole is communicated with the rear end of the rear branch oil groove, and the lower end thereof is communicated with the bottom of the rear half-shaft bearing position of the differential.

[0016] The advantages of the present invention are: at the central position where the splashing lubricating oil is concentrated, that is, directly on both sides of the main reduction gear where the splashing is generated, baffles are added and flow channels are constructed, so that the splashing lubricating oil can be forced to be concentrated and directly distributed to the lubricating bearings in sufficient quantity. At the same time, the method of drilling holes for drainage on the transmission housing near the circular hole-shaped bearing position is used instead of the method of groove drainage, which can not only drain the lubricating oil to the bottom of the bearing position, but also keep the surrounding structure of the bearing position intact, avoiding the transmission housing from cracking when the load increases greatly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a transmission housing after a splash oil cavity having a splash lubricating oil channel structure is provided;

[0018] Figure 2 The schematic diagram of the structure in the front housing of the transmission shows the oil guide groove in the splash lubrication oil channel structure;

[0019] Figure 3It is a three-dimensional schematic diagram of the internal structure of the transmission rear housing, the intermediate shaft rear bearing position and the output shaft rear bearing position in the oil delivery terminal of the splash lubrication oil channel structure;

[0020] Figure 4 It is a schematic diagram of the structure of the splash lubricating oil passage in the front housing of the transmission, mainly showing the oil passage path of the lubricating oil passage at the front bearing of the intermediate shaft;

[0021] Figure 5 for Figure 3 A partial schematic diagram of

[0022] Figure 6 for Figure 5 A schematic diagram mainly shows the oil passage path from the rear oil groove to the intermediate shaft rear bearing position and the output shaft rear bearing position;

[0023] Figure 7 An oil passage path for the splash lubrication oil passage structure to deliver oil to the front half-shaft bearing seat and the rear half-shaft bearing seat of the differential;

[0024] Figure 8 for Figure 7 A three-dimensional schematic diagram of the oil passages for the front half-shaft bearings and the rear half-shaft bearings of the center differential;

[0025] Fig. 9 It is a three-dimensional schematic diagram of splash notch 2 in the splash lubrication oil channel structure.

[0026] In the figure: 1, front housing; 2, rear housing; 3, main reduction gear; 4, splash oil chamber; 41, front baffle; 42, rear baffle; 43, splash notch 1; 44, splash notch 2; 441, oil cut-off port; 442, oil cut-off plate; 443, oil collecting port; 5, oil guide groove; 51, oil receiving port; 52, oil guide groove; 53, rear oil guide groove; 54, front oil guide groove; 6, rear connecting oil groove; rear oil hole 1; 62, rear oil hole 2; 7, front connecting Oil groove; 71, front oil hole; 8, front branch flow channel; 81, front branch oil receiving hole; 82, front branch oil groove; 83, front branch oil hole; 9, rear branch flow channel; 91, rear branch oil receiving hole; 92, rear branch oil groove; 93, rear branch oil hole; 10, oil receiving groove; 11, front bearing position of intermediate shaft; 12, rear bearing position of intermediate shaft; 13, rear bearing position of output shaft; 14, front half shaft bearing position; 15, rear half shaft bearing position; 16, fixing pin; 17, positioning hole. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the embodiments and drawings. The descriptions of the directions such as front, rear, left, right and counterclockwise in this document are limited to the directions of the drawings attached to this document.

[0028] like Figure 1 , 3As shown in , 7, the components and structures of the new energy vehicle transmission related to the present invention include a transmission front housing 1, a transmission rear housing 2, a main reduction gear 3, an intermediate shaft front bearing 11, an intermediate shaft rear bearing 12, an output shaft rear bearing 13, a differential front half shaft bearing 14, a differential rear half shaft bearing 15, and a differential main reduction gear 3.

[0029] The lower part of the main reduction gear 3 is immersed in the lubricating oil in the lower part of the transmission housing. Under working conditions, the main reduction gear 3 rotates counterclockwise at a high speed, causing the lubricating oil to splash along the tangential direction of the gear.

[0030] like Figure 1 As shown, a method for splash lubrication of a transmission bearing is to construct a splash oil chamber 4 in the area where the lubricating oil is concentratedly splashed in the transmission housing, so that the splashed lubricating oil does not spread to the periphery, and the splash amount of the lubricating oil in the splash oil chamber 4 is large. At the same time, a distribution oil channel is constructed, and the lubricating oil from the splash oil chamber 4 is directly distributed to the bearing positions of each target bearing through the distribution oil channel. In this way, the amount of lubricating oil distributed to the bearing positions of each target bearing is large and the supply is stable. The splash oil chamber 4 is constructed in the area where the lubricating oil is concentratedly splashed in the transmission housing, and blocking components are arranged in front and behind the main reduction gear 3, and a closed space is formed by the two blocking components and the inner wall of the transmission front housing 1 between the two blocking components to limit the splashing oil from scattering outward, and a notch is arranged on the splash oil chamber 4 to drain the splashing oil out of the splash oil chamber; the distribution oil channel is constructed by adding an oil groove in the transmission housing and opening an oil groove and an oil hole on the housing, so that the lubricating oil drained from the splash oil chamber 4 can flow to the bottom of the bearing position of each bearing in the transmission housing that needs oil supply.

[0031] like Figure 1 , 2As shown in Figures 3, 4 and 7, an oil channel structure for splash lubrication of a transmission bearing designed according to the above method comprises a splash oil chamber 4 and an oil distribution channel; the splash oil chamber 4 is formed by a front baffle plate 41 arranged in front of the main reduction gear 3, a rear baffle plate 42 arranged behind the main reduction gear 3, and a transmission front housing 1 below and on the right side of the main reduction gear 3; a splash notch 1 43 is arranged above the splash oil chamber 4, and a splash notch 2 44 is arranged on the inner wall of the housing in front of the splash oil chamber 4; the oil channel comprises oil channel 1 and oil channel 2, and both oil channel 1 and oil channel 2 have an oil receiving start end and an oil delivery terminal; the oil delivery terminal of oil channel 1 comprises an output shaft rear bearing position 13, an intermediate shaft rear bearing position 12 and an intermediate shaft front bearing position 11, and its oil receiving start end is located at the splash notch 1 43; the oil delivery terminal of oil channel 2 comprises a front half shaft bearing position 14 and a rear half shaft bearing position 15 of the differential, and its oil receiving start end is located at the splash notch 2 44. This arrangement is to form a relatively closed space in the area where the lubricating oil is concentratedly splashed in the transmission housing to limit the splashing oil from scattering outwards, and to provide a gap that can guide the splashing oil out of the splashing oil cavity, and to directly deliver the lubricating oil from the splashing oil cavity 4 to the bottom of the five bearing positions, namely, the output shaft rear bearing position 13, the intermediate shaft rear bearing position 12, the intermediate shaft front bearing position 11, the front half shaft bearing position 14 and the rear half shaft bearing position 15, through the oil passages 1 and 2. Its significant advantage is that it can force the splashing lubricating oil to be concentrated and directly distributed to the above-mentioned bearing positions in sufficient quantity, ensuring that the bearings of each bearing position are stably and fully lubricated.

[0032] Here are further improvements.

[0033] like Figure 4 As shown, the oil channel 1 includes a sub-oil guide groove 5, which has an oil receiving port 51 located at the right end of the sub-oil guide groove 5, an oil guide groove 52 located in the middle of the sub-oil guide groove 5, a rearward oil guide groove 53 located at the left end of the sub-oil guide groove 5 and bent to the left rear, and a forward oil guide groove 54 located at the left end of the sub-oil guide groove 5 and bent to the left front; the oil receiving port 51 is the oil receiving start of the oil channel 1, facing the splash oil chamber 4 on the right and receiving a large amount of lubricating oil thrown out from the splash oil chamber 4 to the left along the tangent of the main reduction gear 3. The oil receiving port 51 collects the large amount of oil received into a flow, and divides it to the forward oil guide groove 54 and the rearward oil guide groove 53 through the oil guide groove 52.

[0034] like Figure 4 , 5As shown in Figures 6 and 7, the oil passage 1 also includes a rear oil passage, which includes a rear oil groove 6, a rear oil hole 1 61 and a rear oil hole 2 62; the notch of the rear oil groove 6 is located below the rear port of the rear oil guide groove 53, on the upper rear housing 2 between the intermediate shaft rear bearing position 12 and the output shaft rear bearing position 13; the rear oil hole 1 61 leads obliquely from the rear oil groove 6 to the bottom of the intermediate shaft rear bearing position 12, and the rear oil hole 2 62 leads obliquely from the rear oil groove 6 to the bottom of the output shaft rear bearing position 13. In this way, the rear oil groove 6 receives the lubricating oil flowing down from the rear oil guide groove 53 and flows into the bottom of the intermediate shaft rear bearing position 12 and the bottom of the output shaft rear bearing position 13 through the rear oil hole 1 61 and the rear oil hole 2 62 respectively.

[0035] A fixing pin 16 extending backward is provided beside the rear port of the rear oil guide groove 53, and correspondingly, a positioning hole 17 capable of inserting the fixing pin 16 is provided beside the notch of the rear oil guide groove 6. In this way, the notch of the rear oil guide groove 53 can be better fixed to the rear housing 2 to prevent the rear oil guide groove 53 from shaking.

[0036] like Figure 2 , 4 As shown, the oil passage 1 also includes a front oil passage, which includes a front oil connection groove 7 and a front oil hole 71. The front oil connection groove 7 is opened on the inner wall of the front housing 1, one end of which is located below the port of the forward oil guide groove 54, and the other end is located above the front bearing position 11 of the intermediate shaft. The front oil hole 71 leads obliquely from the front oil connection groove 7 to the bottom of the front bearing position 11 of the intermediate shaft. In this way, the front oil connection groove 7 receives the lubricating oil flowing down from the forward oil guide groove 54 and flows into the bottom of the front bearing position 11 of the intermediate shaft through the front oil hole 71.

[0037] like Figure 1 , 9 As shown, the splashing notch 44 includes an oil cut-off port 441, an oil cut-off plate 442 and an oil collecting port 443. The oil cut-off port 441 is provided on the inner wall of the front housing 1 on the right side of the splashing oil chamber 4 to swallow the oil powder thrown out along the tangent of the main reduction gear 3. The oil cut-off plate 442 is located in the oil cut-off port 441, one end of which is connected to the upper side of the oil cut-off port 441, and the other end is bent to the lower right to form the oil collecting port 443 with the end of a surface extending to the right from the lower side of the oil cut-off port 441. The oil cut-off plate 442 is used to intercept the oil powder swallowed by the oil cut-off port 441 and make the intercepted oil powder form a collection flow to flow to the oil collecting port 443.

[0038] like Figure 7 , 8As shown, the oil passage 2 includes an oil receiving groove 10, a front branch flow passage 8 leading to the front half-shaft bearing position, and a rear branch flow passage 9 leading to the rear half-shaft bearing position. The oil receiving groove 10 is the oil receiving start of the oil passage 2, located below the oil collecting port 443 of the splash notch 2 44, with its front end communicating with the front branch flow passage 8, and its rear end communicating with the rear branch flow passage 9. In this way, after the oil receiving groove 10 receives the lubricating oil flowing down from the oil collecting port 443 below the splash notch 2 44, it is transported to the front branch flow passage 8 and the rear branch flow passage 9 at both ends.

[0039] The front branch flow channel 8 includes a front branch oil receiving hole 81, a front branch oil groove 82 and a front branch oil hole 83. The upper end of the front branch oil receiving hole 81 is communicated with the front end of the oil receiving groove 10, and the lower end thereof is communicated with the rear end of the front branch oil groove 82. The upper end of the front branch oil hole 83 is communicated with the front end of the front branch oil groove 82, and the lower end thereof is communicated with the bottom of the front half shaft bearing position 14 of the differential. The lubricating oil obtained by the front branch flow channel 8 from the oil receiving groove 10 flows into the front branch oil groove 82 through the front branch oil receiving hole 81, and then flows into the front half shaft bearing position 14 of the differential through the front branch oil hole 83.

[0040] The rear branch flow channel 9 includes a rear branch oil receiving hole 91, a rear branch oil groove 92 and a rear branch oil hole 93. The upper end of the rear branch oil receiving hole 91 is communicated with the rear end of the oil receiving groove 10, and the lower end thereof is communicated with the front end of the rear branch oil groove 92. The upper end of the rear branch oil hole 93 is communicated with the rear end of the rear branch oil groove 92, and the lower end thereof is communicated with the bottom of the rear half shaft bearing position 15 of the differential. The lubricating oil obtained from the oil receiving groove 10 by the rear branch flow channel 9 flows into the rear branch oil groove 92 through the rear branch oil receiving hole 91, and then flows into the rear half shaft bearing position 15 of the differential through the rear branch oil hole 93.

[0041] It can also be seen from the above settings that when all oil channels approach the bearing position, they enter the bottom of the bearing position by opening oil holes, avoiding the traditional method of grooving around the bearing position for oil delivery. This can well maintain the integrity of the mechanical structure of the shell around the bearing position, thereby ensuring that the shell will not crack when the bearing load suddenly increases.

[0042] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the protection scope of the present invention. Any modifications in equivalent forms should be regarded as falling within the protection scope of the present invention.

Claims

1. An oil channel structure for splash lubrication of a transmission bearing, characterized in that: The invention comprises a splash oil chamber (4) and a distribution oil passage; the splash oil chamber (4) is formed by a front baffle plate (41) arranged in front of the main reduction gear (3), a rear baffle plate (42) arranged behind the main reduction gear (3), and a transmission front housing (1) below and to the right of the main reduction gear (3); a splash notch 1 (43) is arranged above the splash oil chamber (4), and a splash notch 2 (44) is arranged on the inner wall of the front housing of the splash oil chamber (4); the oil passage comprises an oil passage 1 and an oil passage 2, and both the oil passage 1 and the oil passage 2 have The oil passage has an oil receiving start and an oil delivery terminal; the oil delivery terminal of the first oil passage includes an output shaft rear bearing position (13), an intermediate shaft rear bearing position (12) and an intermediate shaft front bearing position (11), and the oil receiving start is located at the splash notch 1 (43); the oil delivery terminal of the second oil passage includes a front half shaft bearing position (14) and a rear half shaft bearing position (15) of the differential, and the oil receiving start is located at the splash notch 2 (44); the first oil passage includes a sub-oil guide groove (5), and the sub-oil guide groove (5) has a right end located at the sub-oil guide groove (5). an oil receiving port (51), an oil guide groove (52) located in the middle of the sub-oil guide groove (5), a rear oil guide groove (53) located at the left end of the sub-oil guide groove (5) and bent toward the left rear, and a forward oil guide groove (54) located at the left end of the sub-oil guide groove (5) and bent toward the left front; the oil receiving port (51) is the oil receiving start end of the oil passage 1, facing the splash oil chamber (4) on the right and receiving the lubricating oil powder thrown out from the splash oil chamber (4) to the left along the tangent of the main reduction gear (3); the oil passage 1 also includes a rear oil passage, and the rear oil passage includes a rear An oil receiving groove (6), a rear oil hole 1 (61) and a rear oil hole 2 (62); the groove opening of the rear oil receiving groove (6) is located below the rear end of the rear oil guide groove (53) and above the rear housing (2) between the intermediate shaft rear bearing position (12) and the output shaft rear bearing position (13); the rear oil hole 1 (61) extends obliquely from the rear oil receiving groove (6) to the bottom of the intermediate shaft rear bearing position (12), and the rear oil hole 2 (62) extends obliquely from the rear oil receiving groove (6) to the bottom of the output shaft rear bearing position (13).

2. The oil channel structure for splash lubrication of a transmission bearing according to claim 1, characterized in that: A fixing pin (16) extending backward is provided next to the rear port of the rear oil guide groove (53), and correspondingly, a positioning hole (17) capable of inserting the fixing pin (16) is provided next to the notch of the rear oil connection groove (6).

3. The oil channel structure for splash lubrication of a transmission bearing according to claim 1, characterized in that: The oil passage 1 also includes a front oil passage, which includes a front oil connection groove (7) and a front oil hole (71). The front oil connection groove (7) is opened on the inner wall of the front housing (1), one end of which is located below the port of the front oil guide groove (54), and the other end is located above the front bearing position (11) of the intermediate shaft. The front oil hole (71) leads obliquely from the front oil connection groove (7) to the bottom of the front bearing position (11) of the intermediate shaft.

4. The oil channel structure for splash lubrication of a transmission bearing according to claim 1, characterized in that: The splashing notch 2 (44) comprises an oil cut-off opening (441), an oil cut-off plate (442) and an oil collecting opening (443). The oil cut-off opening (441) is provided on the inner wall of the front housing (1) on the right side of the splashing oil chamber (4) and is used to swallow the oil powder thrown out along the tangent line of the main reduction gear (3). The oil cut-off plate (442) is located in the oil cut-off opening (441), one end of which is connected to the upper side of the oil cut-off opening (441), and the other end is bent to the lower right, and together with the end of a surface extending to the right from the lower side of the oil cut-off opening (441) forms the oil collecting opening (443).

5. The oil channel structure for splash lubrication of a transmission bearing according to claim 4, characterized in that: The second oil passage comprises an oil receiving groove (10), a front branch flow passage (8) leading to the front half-shaft bearing position, and a rear branch flow passage (9) leading to the rear half-shaft bearing position. The oil receiving groove (10) is the oil receiving start end of the second oil passage and is located below the oil collecting port (443) of the second splash notch (44). Its front end is in communication with the front branch flow passage (8), and its rear end is in communication with the rear branch flow passage (9).

6. The oil channel structure for splash lubrication of a transmission bearing according to claim 5, characterized in that: The front branch flow channel (8) comprises a front branch oil receiving hole (81), a front branch oil groove (82) and a front branch oil hole (83); the upper end of the front branch oil receiving hole (81) is in communication with the front end of the oil receiving groove (10), and the lower end thereof is in communication with the rear end of the front branch oil groove (82); the upper end of the front branch oil hole (83) is in communication with the front end of the front branch oil groove (82), and the lower end thereof is in communication with the bottom of the front half-shaft bearing position (14) of the differential; the rear branch flow channel (9) comprises a rear branch oil receiving hole (91), a rear branch oil groove (92) and a rear branch oil hole (93); the upper end of the rear branch oil receiving hole (91) is in communication with the rear end of the oil receiving groove (10), and the lower end thereof is in communication with the front end of the rear branch oil groove (92); the upper end of the rear branch oil hole (93) is in communication with the rear end of the rear branch oil groove (92), and the lower end thereof is in communication with the bottom of the rear half-shaft bearing position (15) of the differential.

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