A method and structure for ensuring sufficient oil suction in the active lubrication of a three-in-one transmission

Abstract

The present invention discloses a method and structure for ensuring sufficient oil suction of active lubrication in a three-in-one transmission, including an oil return hole provided on the front housing between the motor housing and the gearbox, an oil suction port adjacent to the oil return hole, and an oil accumulation cavity formed on the front housing by a partition plate. The partition plate includes an oil separation rib plate and an oil baffle plate. The front end of the oil separation rib plate is integrally connected to the front housing, and the upper part of the oil baffle plate is installed at the rear end of the front housing. The oil accumulation cavity is formed by the overlapping of the oil separation rib plate, the oil baffle plate and the front housing. The advantages are as follows: It can prevent the lubricating oil containing a large amount of oil bubbles stirred by the main reduction gear and the first reduction gear from entering the oil suction port, and at the same time, the oil suction port can be immersed in the lubricating oil at any time, ensuring sufficient oil suction at the oil suction port; It can control the amount of oil supplied to the main reduction oil stirring cavity and the first reduction oil stirring cavity, avoiding an excessive amount of oil in the main reduction oil stirring cavity and the first reduction oil stirring cavity, which increases the rotational resistance of the main reduction gear and the first reduction gear.

Description

Technical Field

[0001] The present invention relates to the lubrication of a transmission, and particularly to a method and structure for ensuring sufficient oil suction in the active lubrication of a three-in-one transmission, belonging to the technical field of transmission lubrication. Background Art

[0002] In new energy vehicles, the energy conversion efficiency of the motor is generally about 80%, and the rest is dissipated as heat. This will cause the temperature of the motor to rise. The working temperature of the magnetic steel of the motor is at most about 180°, and the maximum insulation temperature of the insulating material is about 200°. The cooling efficiency of the motor directly affects its service life.

[0003] Since the lubricating oil itself is non-magnetic and non-conductive and has no influence on the magnetic circuit of the motor, the active lubrication of the three-in-one new energy transmission has become a trend in the development of this field. At present, the industry's approach is to establish an active lubrication system, that is, to add an oil pump and an active lubrication pipeline. The active lubrication pipeline sucks oil from the bottom of the gearbox, passes through a filter to filter the lubricating oil, and then cools the lubricating oil through a heat exchanger. The cooled lubricating oil is used to cool the motor stator and rotor in two ways through the oil channels designed on the housing in advance or the oil pipes arranged, and to cool and lubricate some specific parts. The lubricating oil after cooling the motor stator and rotor enters the bottom of the gearbox again through the communication holes and oil return holes on the front housing of the gearbox located between the motor housing and the gearbox.

[0004] In such an active lubrication process, whether the oil pump sucks oil sufficiently is crucial, which directly affects the cooling effect and the lubrication effect of specific parts.

[0005] However, in the above setting, the oil suction port of the oil pump is located at the bottom of the gearbox, and this position is exactly the oil stirring area of the main reduction gear and a secondary reduction gear of the gearbox. The high-speed rotating main reduction gear and a secondary reduction gear cause the lubricating oil in this area to splash, providing splash lubrication for the bearings and gear teeth in the transmission. Therefore, under the high-speed agitation of the main reduction gear and a secondary reduction gear, a large number of oil bubbles containing gas are generated in the lubricating oil at the bottom of the gearbox. These lubricating oils containing a large number of oil bubbles enter the cooling pipeline of the active lubrication through the oil suction port, resulting in a significant reduction in the actual cooling oil volume and seriously weakening the refrigeration effect.

[0006] Another problem with the above setting is that due to the certain bottom area of the gearbox, when the lubricating oil volume in the gearbox decreases, and when the vehicle body bumps or tilts, the lubricating oil at the bottom of the gearbox cannot submerge the oil suction port of the oil pump, resulting in insufficient oil suction or even complete inability to suck in lubricating oil, which will also weaken the refrigeration effect. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the prior art cannot ensure that the oil suction port of the oil pump located at the bottom of the gearbox can suck oil sufficiently.

[0008] In view of the above problems, the technical solution proposed by the present invention is:

[0009] A method for ensuring sufficient oil suction for active lubrication of a three-in-one transmission is to set a separate oil supply space for the oil suction port in the area where the oil suction port is located at the bottom of the gearbox of the transmission, so that the lubricating oil flowing back from the motor box first accumulates in the oil supply space to submerge the oil suction port, and prevents the oil bubbles generated by the main reduction gear stirring the lubricating oil in the main reduction stirring oil cavity and a secondary reduction gear stirring the lubricating oil in the secondary reduction stirring oil cavity from entering the oil supply space.

[0010] The area where the oil suction port is set at the bottom of the gearbox is separated into a separate oil supply space for the oil suction port by arranging an oil separation rib plate and an oil baffle plate under the secondary reduction gear shaft of a secondary reduction gear, integrally forming the front end of the oil separation rib plate with the front housing of the gearbox, and then installing the oil baffle plate at the rear end of the oil separation rib plate. The oil accumulation cavity is formed by the oil separation rib plate, the oil baffle plate and the front housing.

[0011] Furthermore, for the method for ensuring sufficient oil suction for active lubrication of a three-in-one transmission as described above, the lubricating oil in the oil accumulation cavity is used to supply a controlled amount of oil to the main reduction stirring oil cavity and the secondary reduction stirring oil cavity, that is, a main reduction oil supply hole and a secondary reduction oil supply hole for supplying oil to the main reduction stirring oil cavity and the secondary reduction stirring oil cavity are respectively opened on the oil separation rib plate and the oil baffle plate, and the main reduction stirring oil cavity and the secondary reduction stirring oil cavity are supplied with a controlled amount of oil by controlling the aperture sizes of the main reduction oil supply hole and the secondary reduction oil supply hole.

[0012] Furthermore, for the method for ensuring sufficient oil suction for active lubrication of a three-in-one transmission as described above, the main reduction oil supply hole and the secondary reduction oil supply hole are opened at a position higher than the oil suction port and lower than the oil accumulation liquid level in the oil accumulation cavity.

[0013] A structure for ensuring sufficient oil suction for active lubrication of a three-in-one transmission includes an oil return hole on the front housing between the motor box and the gearbox, an oil suction port at the bottom of the gearbox adjacent to the oil return hole, and an oil accumulation cavity formed by a partition on the front housing. The oil return hole and the oil suction port are both on the front housing within the oil accumulation cavity.

[0014] Furthermore, an opening is provided above the oil accumulation cavity, and above the opening is a communication hole on the front housing between the motor box and the gearbox, and part of the lubricating oil in the motor box can flow into the oil accumulation cavity through the communication hole.

[0015] Further, the partition plate includes an oil separation rib plate and an oil baffle plate. The front end of the oil separation rib plate is integrally connected to the front housing. The upper part of the oil baffle plate is installed at the rear end of the front housing, and the lower end of the oil baffle plate contacts the bottom of the front housing. The oil accumulation cavity formed by the partition plate on the front housing is formed by the overlapping of the oil separation rib plate, the oil baffle plate and the front housing.

[0016] Further, a rib partition is provided at the bottom of the gearbox outside the oil accumulation cavity to separate the oil stirring areas of the main reduction gear and one secondary reduction gear into a main reduction oil stirring cavity and a secondary reduction oil stirring cavity.

[0017] Further, a main reduction oil supply hole and a secondary reduction oil supply hole for supplying oil to the main reduction oil stirring cavity and the secondary reduction oil stirring cavity are respectively provided on the oil separation rib plate and the oil baffle plate.

[0018] Further, the positions of the main reduction oil supply hole and the secondary reduction oil supply hole are higher than the position of the oil suction port and lower than the position of the oil level in the oil accumulation cavity.

[0019] Beneficial effects:

[0020] 1. Compared with the prior art, by providing the oil accumulation cavity, the lubricating oil containing a large amount of oil bubbles generated by the high-speed stirring of the main reduction gear and one secondary reduction gear is blocked and cannot enter the oil suction port. At the same time, by providing the oil accumulation cavity, the oil suction port can be immersed in the lubricating oil at any time, ensuring sufficient oil suction at the oil suction port and significantly improving the cooling and lubrication effects of the active lubrication system.

[0021] 2. By respectively providing the main reduction oil supply hole and the secondary reduction oil supply hole on the oil separation rib plate and the oil baffle plate, the amount of oil supplied to the main reduction oil stirring cavity and the secondary reduction oil stirring cavity can be controlled by setting the aperture sizes of the main reduction oil supply hole and the secondary reduction oil supply hole, avoiding an excessive amount of oil in the main reduction oil stirring cavity and the secondary reduction oil stirring cavity from increasing the rotational resistance of the main reduction gear and one secondary reduction gear, thereby achieving the effect of reducing the operating energy consumption of the transmission. Description of the drawings

[0022] Figure 1 is a three-in-one transmission three-dimensional schematic diagram;

[0023] Figure 2 is a three-dimensional schematic diagram of the oil accumulation cavity and the area of the three-in-one transmission where it is located;

[0024] Figure 3 is a three-dimensional schematic diagram of the oil accumulation cavity and the area of the three-in-one transmission where it is located, showing the situation when the oil baffle plate is not installed in the oil accumulation cavity;

[0025] Figure 4 is a three-dimensional schematic diagram of the positional relationship of the oil accumulation cavity, the main reduction oil stirring cavity and the secondary reduction oil stirring cavity in the gearbox.

[0026] In the figure: 1. Oil accumulation cavity; 2. Opening; 3. Main reduction stirring oil cavity; 4. Auxiliary reduction stirring oil cavity; 5. Motor box; 6. Gearbox; 7. Oil suction port; 8. Main reduction gear; 9. First auxiliary reduction gear; 10. First auxiliary reduction gear shaft; 11. Front housing; 12. Rear housing; 13. Oil return hole; 14. Communication hole; 15. Oil separation rib plate; 16. Oil baffle; 17. Main reduction oil supply hole; 18. Auxiliary reduction oil supply hole; 19. Rib partition. Specific implementation mode

[0027] The present invention will be further described below in conjunction with embodiments and drawings:

[0028] As Figure 1 —4 shows, the three-in-one transmission includes a motor box 5 and a gearbox 6. The gearbox 6 is a closed box formed by buckling a front housing 11 and a rear housing 12. The gearbox 6 has a main reduction gear 8 and a first auxiliary reduction gear 9. There is lubricating oil at the bottom of the gearbox 6, and the lower parts of the main reduction gear 8 and the first auxiliary reduction gear 9 are immersed in the lubricating oil at the bottom of the gearbox 6; on the front housing 11 between the motor box 5 and the gearbox 6, there is an oil return hole 13 connecting the bottom of the motor box 5 and the bottom of the gearbox 6; on the front housing above the oil return hole 13, there is also a communication hole 14 connecting the motor box 5 and the gearbox 6. To effectively control the motor temperature rise and lubricate the components in some areas of the three-in-one transmission, an active lubrication system is added to the new energy three-in-one transmission, which mainly includes an oil pump, pipelines, a cooling mechanism, etc. The oil suction port 7 of the pipeline of the active lubrication system is arranged on the front housing near the oil return hole 13 at the bottom of the gearbox. The oil suction port 7 of the pipeline of the active lubrication system sucks oil from the bottom of the gearbox under the action of the oil pump, and most of the lubricating oil passing through the active lubrication system enters the motor box 5, and then returns to the bottom of the gearbox 6 through the oil return hole 13 and the communication hole 14 between the motor box 5 and the gearbox 6.

[0029] A method to ensure sufficient oil suction for the active lubrication of the three-in-one transmission is to separate an independent oil supply space for the oil suction port 7 in the area where the oil suction port 7 is arranged at the bottom of the gearbox 6 of the transmission, so that the lubricating oil flowing back from the motor box 5 first accumulates in the oil supply space to submerge the oil suction port 7, and prevents the oil bubbles generated by the main reduction gear 8 stirring the lubricating oil in the main reduction stirring oil cavity 3 and the first auxiliary reduction gear 9 stirring the lubricating oil in the auxiliary reduction stirring oil cavity 4 from entering the oil supply space. In this way, compared with the prior art, by separating an independent oil supply space for the oil suction port 7, the lubricating oil containing a large amount of oil bubbles generated by the high-speed stirring of the main reduction gear 8 and the first auxiliary reduction gear 9 is blocked and cannot enter the oil suction port 7. At the same time, by separating an independent oil supply space for the oil suction port 7, the oil suction port 7 can be submerged by the lubricating oil at any time, which can ensure sufficient oil suction at the oil suction port and significantly improve the cooling and lubrication effects of the active lubrication system.

[0030] The area where the oil suction port 7 is provided at the bottom of the transmission 6 separates an independent oil supply space for the oil suction port 7. An oil separation rib plate 15 and an oil baffle 16 are provided below a secondary reduction gear shaft 10 of a secondary reduction gear 9. The front end of the oil separation rib plate 15 is integrally formed with the front housing 11 of the transmission 6, and then the oil baffle 16 is installed at the rear end of the oil separation rib plate 15. An oil accumulation cavity 1 is formed by the oil separation rib plate 15, the oil baffle 16 and the front housing 11.

[0031] The lubricating oil in the oil accumulation cavity 1 is used to supply a controlled amount of oil to the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4. That is, a main reduction oil supply hole 17 and a secondary reduction oil supply hole 18 for supplying oil to the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4 are respectively opened on the oil separation rib plate 15 and the oil baffle 16, and the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4 are supplied with a controlled amount of oil by controlling the aperture sizes of the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18.

[0032] In the above method, the aperture sizes of the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18 are set according to the splash amount when the main reduction gear 8 and the secondary reduction gear 9 stir in the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4. The overall effect is to control the liquid level height of the lubricating oil in the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4, which can not only meet the splash lubrication in the transmission 6, but also prevent the amount of oil in the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4 from being too much, and can avoid too much resistance generated when the main reduction gear 8 and the secondary reduction gear 9 rotate, thereby improving the rotation efficiency of the transmission.

[0033] In the above method, the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18 are opened at a position higher than the oil suction port 7 and below the oil accumulation liquid level in the oil accumulation cavity 1. In this way, first, it is ensured that the oil suction port 7 is always submerged in the lubricating oil, which can ensure sufficient oil suction. Second, it is to supply a controlled amount of oil to the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4. It should be noted here that after the oil accumulation cavity 1 is sucked by the active lubrication system and a controlled amount of oil is supplied to the main reduction stirring cavity 3 and the secondary reduction stirring cavity 4, the excess lubricating oil will accumulate in the oil accumulation cavity 1, and its liquid level will surely be higher than the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18.

[0034] As Figure 1As shown in Fig. 4, a structure for ensuring sufficient oil suction in the active lubrication of a three-in-one transmission includes an oil return hole 13 provided on the front housing 11 between the motor housing 5 and the gearbox 6, an oil suction port 7 provided at the bottom of the gearbox adjacent to the oil return hole 13, and an oil accumulation cavity 1 formed on the front housing 11 by a partition plate. The oil return hole 13 and the oil suction port 7 are both located on the front housing 11 within the oil accumulation cavity 1. In this way, most of the lubricating oil flowing into the motor housing through the active lubrication system flows into the oil accumulation cavity 1 through the oil return hole 13 and accumulates in the oil accumulation cavity 1 first, avoiding spreading at the bottom of the gearbox 6, ensuring that the lubricating oil in the oil accumulation cavity 1 submerges the oil suction port 7, so that the oil suction port 7 can always absorb sufficient lubricating oil; at the same time, it can prevent the oil bubbles generated by the agitation of the main reduction gear 8 and a secondary reduction gear 9 adjacent to the oil accumulation cavity 1 at the bottom of the gearbox 6 from entering the oil accumulation cavity 1, ensuring a significant reduction in the gas content of the lubricating oil sucked by the active lubrication system.

[0035] An opening 2 is provided above the oil accumulation cavity 1, and above the opening 2 is a communication hole 14 on the front housing 11 between the motor housing 5 and the gearbox 6. Part of the lubricating oil in the motor housing 5 can flow into the oil accumulation cavity 1 through the communication hole 14.

[0036] The partition plate includes an oil separation rib plate 15 and an oil baffle plate 16. The front end of the oil separation rib plate 15 is integrally connected to the front housing 11. The upper part of the oil baffle plate 16 is installed at the rear end of the front housing 11, and the lower end of the oil baffle plate 16 contacts the bottom of the front housing 11. The oil accumulation cavity 1 formed on the front housing 11 by the partition plate is formed by the overlapping of the oil separation rib plate 15 and the oil baffle plate 16 with the front housing 11. In this way, the oil accumulation cavity 1 can be constructed with a relatively simple structure.

[0037] A rib partition 19 is provided at the bottom of the gearbox 6 outside the oil accumulation cavity 1 to separate the oil agitation areas of the main reduction gear 8 and a secondary reduction gear 9 into a main reduction oil agitation cavity 3 and a secondary reduction oil agitation cavity 4. In this way, the oil accumulation cavity 1 is located below the secondary reduction gear shaft 10 in front of a secondary reduction gear 9, adjacent to the secondary reduction oil agitation cavity 4 at the back, and adjacent to the main reduction oil agitation cavity 3 on the right.

[0038] A main reduction oil supply hole 17 and a secondary reduction oil supply hole 18 for supplying oil to the main reduction oil agitation cavity 3 and the secondary reduction oil agitation cavity 4 are respectively provided on the oil separation rib plate 15 and the oil baffle plate 16.

[0039] The above settings can control the oil quantities in the main reduction stirring oil cavity 3 and the secondary reduction stirring oil cavity 4 by controlling the aperture sizes of the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18 respectively. The overall effect is to control the liquid levels of the lubricating oil in the main reduction stirring oil cavity 3 and the secondary reduction stirring oil cavity 4, so that it can not only meet the splash lubrication in the transmission 6, but also prevent the oil quantities in the main reduction stirring oil cavity 3 and the secondary reduction stirring oil cavity 4 from being too much, and can avoid too much resistance generated when the main reduction gear 8 and the first secondary reduction gear 9 rotate, thereby improving the rotation efficiency of the transmission.

[0040] The positions of the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18 are higher than the position of the oil suction port 7 and lower than the oil accumulation liquid level in the oil accumulation cavity 1. Such a setting first ensures that the oil suction port 7 is always submerged in the lubricating oil, ensuring sufficient oil suction. Secondly, it is to supply a controlled amount of oil to the main reduction stirring oil cavity 3 and the secondary reduction stirring oil cavity 4. It should be noted that after the oil accumulation cavity 1 is sucked by the active lubrication system and a controlled amount of oil is supplied to the main reduction stirring oil cavity 3 and the secondary reduction stirring oil cavity 4, the excess lubricating oil will accumulate in the oil accumulation cavity 1, and its liquid level will necessarily be higher than the main reduction oil supply hole 17 and the secondary reduction oil supply hole 18.

[0041] The above embodiments are only used to describe the present invention more clearly, and cannot be regarded as limiting the protection scope covered by the present invention. Any modification in an equivalent form should be regarded as falling within the protection scope covered by the present invention.

Claims

1. A structure for ensuring sufficient oil suction in the active lubrication of a three-in-one transmission, including an oil return hole (13) on the front housing (11) provided between the motor housing (5) and the gearbox (6), and an oil suction port (7) provided at the bottom of the gearbox adjacent to the oil return hole (13). Characterized in that: It further includes an oil accumulation cavity (1) formed by a partition on the front housing (11). The oil return hole (13) and the oil suction port (7) are both located on the front housing (11) within the oil accumulation cavity (1). The partition includes an oil separation rib plate (15) and an oil baffle plate (16). The front end of the oil separation rib plate (15) is integrally connected to the front housing (11). The upper part of the oil baffle plate (16) is installed at the rear end of the front housing (11), and the lower end of the oil baffle plate (16) contacts the bottom of the front housing (11). The oil accumulation cavity (1) formed by the partition on the front housing (11) is formed by the overlap of the oil separation rib plate (15) and the oil baffle plate (16) with the front housing (11). A rib partition (19) is provided at the bottom of the gearbox (6) outside the oil accumulation cavity (1) to separate the oil stirring area of the main reduction gear (8) and the oil stirring area of a secondary reduction gear (9) into a main reduction oil stirring cavity (3) and a secondary reduction oil stirring cavity (4). Main reduction oil supply holes (17) and secondary reduction oil supply holes (18) for supplying oil to the main reduction oil stirring cavity (3) and the secondary reduction oil stirring cavity (4) are respectively provided on the oil separation rib plate (15) and the oil baffle plate (16). The main reduction oil stirring cavity (3) and the secondary reduction oil stirring cavity (4) are supplied with oil in a controlled amount by controlling the aperture sizes of the main reduction oil supply holes (17) and the secondary reduction oil supply holes (18). An opening (2) is provided above the oil accumulation cavity (1). Above the opening (2) is a communication hole (14) on the front housing (11) located between the motor housing (5) and the gearbox (6). Part of the lubricating oil in the motor housing (5) can flow into the oil accumulation cavity (1) through the communication hole (14).

2. The structure for ensuring sufficient oil suction in the active lubrication of a three-in-one transmission according to claim 1, Characterized in that: The positions of the main reduction oil supply holes (17) and the secondary reduction oil supply holes (18) are higher than the position of the oil suction port (7) and lower than the position of the oil accumulation liquid level in the oil accumulation cavity (1).

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