New energy automobile transmission lubricating system

Abstract

The invention discloses a new energy automobile transmission lubricating system which comprises a transmission shell, an oil collecting groove, a first oil groove, an oil pump and a controller. The first oil groove is used for medium-low speed gear oil immersion lubrication; the oil collecting grooves are formed above the gears respectively and communicated with the bearings through respective oil guide pipes, flow sensors are arranged on the oil guide pipes, and oil outlets are formed in the bottoms of the bearings; the oil pump is arranged outside the transmission shell, an inlet of the oil pump is communicated with the first oil groove through an oil suction pipe, and an outlet of the oil pump is communicated with the oil collecting grooves through oil conveying pipes. The oil pump, the flow sensor and the flow self-control valve are all connected with the controller. By monitoring the flow of lubricating oil entering the bearing and controlling the opening and closing of the flow self-control valve to supply oil to the bearing, the problem of insufficient lubrication of the bearing under different working conditions is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and in particular to a transmission lubrication system for a new energy vehicle. Background Art

[0002] The transmission is an important part of the powertrain system of new energy vehicles, and the gears and bearings in the transmission need to be in good lubrication condition to reduce wear between parts and to cool and dissipate heat. For the lubrication system of the transmission, the lubricating oil flow rate is a key parameter: if the flow rate is too small, the lubrication is insufficient, which in severe cases will lead to increased wear on the meshing surface and excessive temperature of the parts; if the flow rate is too large, the stirring torque will increase, resulting in power loss.

[0003] In the prior art, the lubrication structure of the transmission is usually to open an oil groove above the bearing seat, and the oil groove is connected to the bearing shell through an oil guide pipe; when the gear rotates at high speed, the lubricating oil is thrown onto the inner wall of the transmission, and then the lubricating oil flows from the inner wall to the oil collecting groove and enters the oil guide pipe to lubricate the bearing. The shortcomings of the existing lubrication scheme are: when the gear runs at a low speed, too little oil is thrown into the oil collecting groove, resulting in insufficient lubrication of the bearing; and although the amount of oil brought into the oil collecting groove increases when the gear runs at high speed, the amount of lubricating oil required by the bearing is related to the temperature, and the high-speed rotating gear bearings need more oil to cool down. Therefore, the gear may also cause insufficient bearing lubrication when running at high speed. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a new energy vehicle transmission lubrication system.

[0005] The technical solution adopted by the present invention is:

[0006] A new energy vehicle transmission lubrication system comprises a transmission housing, an oil collecting tank, a first oil tank, an oil pump and a controller; the first oil tank is arranged in the transmission housing, and medium and low speed gears are immersed in the first oil tank; the oil collecting tanks are respectively arranged above each gear, and are connected with the bearings through respective oil guide pipes, each oil guide pipe is provided with a flow sensor, and the bottom of each bearing is provided with an oil outlet, and the oil outlet is connected with the first oil tank; the oil pump is arranged outside the transmission housing, and its inlet is connected with the first oil tank through an oil suction pipe, and its outlet is respectively connected with each oil collecting tank through an oil delivery pipe, and the oil delivery pipe is provided with a flow automatic control valve for controlling the oil inlet amount of each oil collecting tank; the oil pump, the flow sensor, and the flow automatic control valve are all connected with the controller; the controller controls the start and stop of the oil pump and the opening or closing of the flow automatic control valve according to the flow value detected by the flow sensor.

[0007] By adopting the above technical solution, when the large gear rotates at high speed, the lubricating oil is thrown onto the inner wall of the transmission housing, and part of the lubricating oil is collected in the oil collecting tank and enters the bearing through the oil guide pipe to lubricate the bearing; in this process, the flow sensor detects the amount of lubricating oil entering each bearing. When the detected amount of lubricating oil is lower than the set value, the controller first controls the flow automatic control valve to open, and then controls the start of the oil pump. The oil in the first oil tank is replenished with lubricating oil to the corresponding oil collecting tank through the oil pump and the oil pipeline. When the amount of lubricating oil detected by the flow sensor reaches the set value, the controller controls the oil pump to stop rotating and the flow automatic control valve is closed. The set value can be set according to experience to meet the bearing lubrication. By adopting the above technical means, the problem of insufficient lubrication of existing transmission bearings can be solved.

[0008] Furthermore, a first temperature sensor is provided on the oil outlet, and the first temperature sensor is connected to the controller; the controller calculates the amount of lubricating oil G required for the bearing at the current temperature according to the difference ΔT between the temperature value T1 detected in real time by the first temperature sensor and the initially set temperature value T0 according to formula (1), and adjusts the control parameter of the flow automatic control valve; when the flow value detected by the flow sensor is lower than the control parameter, the oil pump and the flow automatic control valve are started to input lubricating oil into the corresponding oil collecting tank;

[0009]

[0010] G: The amount of lubricating oil required by the bearing at the current temperature, L / min;

[0011] μ: bearing friction coefficient;

[0012] d: nominal inner diameter of the bearing, mm;

[0013] n: bearing speed, r / min;

[0014] p: equivalent dynamic load of bearing, N;

[0015] c: specific heat of lubricating oil, J / (kg·℃);

[0016] r: density of lubricating oil, g / cm 3 ;

[0017] ΔT=T1-T0, ℃.

[0018] By adopting the above technical solution, the temperature and flow rate of the lubricating oil can be controlled in a coordinated manner, and the amount of lubricating oil required by the bearing at the current temperature can be accurately controlled, further ensuring the lubrication effect of the bearing.

[0019] Furthermore, one end of the oil delivery pipe is connected to the oil pump, and the other end extends into the transmission housing to form branches connected to the oil collecting tanks, and each branch is provided with a flow automatic control valve. The pipeline structure is simple and the oil pump efficiency is high.

[0020] Furthermore, the oil collecting tank is V-shaped, and an oil discharge port is arranged at the lowest point, and the oil discharge port is connected to the oil guide pipe, so as to collect the lubricating oil and discharge the collected lubricating oil to the bearing.

[0021] Furthermore, it also includes a second oil tank, which is arranged in the transmission housing and connected to the first oil tank through a control valve; a second temperature sensor is provided in the first oil tank, and the control valve and the second temperature sensor are connected to a controller, and the controller controls the opening or closing of the control valve according to the oil temperature in the first oil tank detected by the second temperature sensor.

[0022] With the above technical solution, when the large gear rotates at high speed, a large amount of lubricating oil is stirred onto the gearbox housing. At this time, the lubricating oil level in the first oil tank decreases, the gear oil immersion depth decreases, the gear can stir less oil, and the lubrication is insufficient, resulting in an increase in the temperature of the lubricating oil in the first oil tank; when the second temperature sensor detects that the lubricating oil temperature is higher than the critical value, the controller opens the solenoid valve. At this time, the oil in the second oil tank flows to the first oil tank through the solenoid valve, the gear oil immersion depth increases, and more lubricating oil participates in lubrication and heat dissipation; when the temperature drops below the critical value, the solenoid valve is closed, and the two oil tanks are no longer connected. When the car stops and the power is cut off, the solenoid valve is opened, and the lubricating oil levels in the two oil tanks are level. When the car is started again, the solenoid valve is powered on and closed. This realizes the automatic adjustment of the lubricating oil amount of the bearings and gears under different working conditions, solving the problem of insufficient gear lubrication.

[0023] Furthermore, it also includes a second oil tank, which is arranged in the transmission housing and connected to the first oil tank through a control valve; a liquid level sensor is provided in the first oil tank, and the control valve and the liquid level sensor are both connected to a controller, and the controller controls the opening or closing of the control valve according to the lubricating oil level in the first oil tank detected by the liquid level sensor.

[0024] With the above technical solution, when the large gear rotates at high speed, a large amount of lubricating oil is stirred onto the gearbox housing. At this time, the lubricating oil level in the first oil tank decreases, the gear oil immersion depth decreases, the gear can stir less oil, and the lubrication is insufficient; when the liquid level sensor detects that the lubricating oil level is lower than the critical value, the controller opens the solenoid valve. At this time, the oil in the second oil tank flows to the first oil tank through the solenoid valve, the gear oil immersion depth increases, and more lubricating oil participates in lubrication and heat dissipation; when the liquid level rises above the critical value, the solenoid valve is closed, and the two oil tanks are no longer connected. When the car is parked and the power is cut off, the solenoid valve is opened, and the lubricating oil levels in the two oil tanks are level. When the car is started again, the solenoid valve is powered on and closed. Thereby, the automatic adjustment of the lubricating oil amount of the bearings and gears under different working conditions is realized, solving the problem of insufficient gear lubrication.

[0025] Furthermore, the second oil tank is connected to the first oil tank through a connecting pipe arranged at the bottom of the second oil tank, and a control valve is arranged on the connecting pipe, and the control valve is an electromagnetic control valve, which is conducive to automatic control.

[0026] Furthermore, the second temperature sensor or the liquid level sensor is arranged at the outlet of the control valve, which is conducive to accurately measuring the oil temperature or the liquid level in the first oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the new energy vehicle lubrication system according to Example 1 of the present invention.

[0028] Figure 2 This is a lubrication path diagram of the new energy vehicle lubrication system of the present invention.

[0029] In the figure: 1-transmission housing, 2-flow sensor, 3-flow automatic control valve, 4-branch pipeline, 5-oil collecting tank, 6-oil guide pipe, 7-gear, 8-oil pipeline, 9-bearing, 10-second oil tank, 11-solenoid valve, 12-second temperature sensor, 13-first oil tank, 14-first temperature sensor, 15-oil outlet, 16-oil suction pipe, 17-oil pump. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and a preferred implementation manner.

[0031] See also Figure 1 , Embodiment 1 provides a new energy vehicle transmission lubrication system, which mainly includes a transmission housing 1, a first oil tank 13, a second oil tank 10, an oil collecting tank 5, an oil pump 17 and a controller;

[0032] The transmission housing is divided into a first oil groove 13 and a second oil groove 10 by a partition, and the height of the partition is higher than the maximum liquid level of the first oil groove 13; the first oil groove 13 is open, located below the medium and low speed gears, and is used for oil immersion lubrication of the medium and low speed gears; the second oil groove 10 is closed, and a through hole connected to the inner cavity of the transmission housing is set on the top surface. The second oil groove 10 is located below the high speed gear, and the bottom is connected to the first oil groove 13 through a connecting pipe, and the connecting pipe is provided with a solenoid valve 11 and a second temperature sensor 12. The second temperature sensor 12 is used to detect the temperature of the lubricating oil in the first oil groove 13.

[0033] The V-shaped oil collecting tank 5 is respectively arranged above the high, medium and low speed gears, and is connected to each gear bearing through an oil guide pipe 6, and each oil guide pipe 6 is provided with a flow sensor 2. An oil outlet 15 is arranged at the bottom of each gear bearing, and the oil outlet 15 is connected to the first oil tank 13, and a first temperature sensor 14 for detecting the outlet oil temperature is arranged on the oil outlet 15.

[0034] The oil pump 17 is arranged outside the transmission housing 1, and its inlet is connected to the first oil tank 13 through the oil suction pipe 16, and the outlet is connected to the oil delivery pipe 8. The other end of the oil delivery pipe extends into the transmission housing 1 to form a branch 4, and the branch 4 is connected to the oil collecting tank 5 respectively. A flow automatic control valve 3 is provided at the end of each branch 4.

[0035] The oil pump 17, the flow sensor 2, the flow automatic control valve 3, the first temperature sensor 14, the solenoid valve 11 and the second temperature sensor 12 are all connected to the controller.

[0036] The working mode of embodiment 1 is:

[0037] When the gear 7 runs at a low speed, the gear 7 stirs the lubricating oil in the first oil tank 13, and a small amount of lubricating oil splashes onto the transmission housing 1, and then flows to the oil guide pipe 6 through the oil collecting tank 5. At this time, the flow sensor 2 installed at the oil guide pipe 6 detects the flow signal, and the controller receives the signal. When it is determined that the flow rate is less than the set value, the flow automatic control valve 3 is controlled to open, the oil pump 17 is started, and the lubricating oil enters the oil collecting tank 5 from the branch 4. The oil in the oil collecting tank 5 enters the bearing 9 through the oil guide pipe 6. When the flow rate reaches the set value, the flow automatic control valve 3 is closed to stop pumping oil.

[0038] After lubricating the bearing 9, the lubricating oil flows back to the first oil tank 13 from the oil outlet 15. The oil outlet 15 is equipped with a first temperature sensor 14 for measuring the temperature of the lubricating oil. When the temperature is higher than the set temperature value, the controller calculates the amount of lubricating oil G required for the bearing at the current temperature according to the difference ΔT between the temperature value T1 detected in real time by the first temperature sensor 14 and the initially set temperature value T0 according to formula (1) to adjust the control parameter of the flow automatic control valve. When the flow value detected by the flow sensor is lower than the control parameter, the oil pump and the flow automatic control valve are started to input lubricating oil to the corresponding oil collecting tank; the oil supply is stopped until the detected lubricating oil flow is equal to the new set value.

[0039]

[0040] G: The amount of lubricating oil required by the bearing at the current temperature, L / min;

[0041] μ: bearing friction coefficient;

[0042] d: nominal inner diameter of the bearing, mm;

[0043] n: bearing speed, r / min;

[0044] p: equivalent dynamic load of bearing, N;

[0045] c: specific heat of lubricating oil, J / (kg·℃);

[0046] r: density of lubricating oil, g / cm 3 ;

[0047] ΔT=T1-T0, ℃; T0 is the maximum temperature allowed when the bearing is normally lubricated, which is determined according to the characteristics of the bearing and lubricating oil.

[0048] When the gear 7 rotates at high speed, a large amount of lubricating oil is stirred onto the gearbox housing 1 and other parts. At this time, the lubricating oil level in the first oil groove 13 decreases, and the oil immersion depth of the gear 7 becomes smaller. The gear 7 has less oil to stir, insufficient lubrication, and temperature rise. When the second temperature sensor 12 in the first oil groove 13 detects that the lubricating oil temperature is higher than the critical value, the controller opens the solenoid valve 11 between the second oil groove 10 and the first oil groove 13. At this time, the oil in the second oil groove 10 flows to the first oil groove 13 through the solenoid valve 11, the oil immersion depth of the gear 7 increases, and more lubricating oil participates in lubrication and heat dissipation. When the temperature drops below the critical value, the solenoid valve 11 is closed, and the two oil grooves are no longer connected. When the car is parked and the power is cut off, the solenoid valve 11 is opened, and the lubricating oil levels of the two oil grooves are level. When the car is started again, the solenoid valve is powered on and closed. Finally, the automatic adjustment of the lubricating oil amount of the bearings and gears under different working conditions is achieved.

[0049] Example 2

[0050] The new energy vehicle transmission lubrication system of this embodiment is basically the same as that of Embodiment 1, with the only difference being that a liquid level sensor is provided in the first oil tank, the control valve and the liquid level sensor are both connected to the controller, and the controller controls the opening or closing of the control valve according to the lubricating oil level in the first oil tank detected by the liquid level sensor.

[0051] The working mode of Example 2 is basically the same as that of Example 1, except that the controller controls the connection or disconnection between the first oil tank and the second oil tank through the liquid level sensor.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications are also within the protection scope of the present invention.

Claims

1. A new energy vehicle transmission lubrication system, characterized in that: It comprises a transmission housing (1), an oil collecting tank (5), a first oil tank (13), an oil pump (17) and a controller; The first oil groove (13) is arranged in the transmission housing (1), and the medium and low speed gears are immersed in the first oil groove (13); The oil collecting tank (5) is respectively arranged above each gear and is connected to the bearing through a respective oil guide pipe (6). A flow sensor (2) is arranged on each oil guide pipe (6). An oil outlet (15) is arranged at the bottom of each bearing. The oil outlet (15) is connected to the first oil tank (13). The oil pump (17) is arranged outside the transmission housing (1), the inlet of the oil pump (17) is connected to the first oil tank (13) through the oil suction pipe (16), and the outlet is connected to each oil collecting tank (5) through the oil delivery pipe (8), and the oil delivery pipe (8) is provided with a flow automatic control valve (3) for controlling the oil inlet amount of each oil collecting tank (5); The oil pump (17), the flow sensor (2) and the flow automatic control valve (3) are all connected to a controller; the controller controls the start and stop of the oil pump (17) and the opening or closing of the flow automatic control valve (3) according to the flow value detected by the flow sensor (2).

2. The new energy vehicle transmission lubrication system according to claim 1 is characterized in that: A first temperature sensor (14) is provided on the oil outlet (15), and the first temperature sensor (14) is connected to the controller; The controller calculates the amount of lubricating oil G required for the bearing at the current temperature according to formula (1) based on the difference ΔT between the temperature value T1 detected in real time by the first temperature sensor (14) and the initially set temperature value T0, and adjusts the control parameter of the flow automatic control valve (3). When the flow value detected by the flow sensor (2) is lower than the control parameter, the oil pump (17) and the flow automatic control valve (3) are started to input lubricating oil into the corresponding oil collecting tank (5); G: The amount of lubricating oil required by the bearing at the current temperature, L / min; μ: bearing friction coefficient; d: nominal inner diameter of the bearing, mm; n: bearing speed, r / min; p: equivalent dynamic load of bearing, N; c: specific heat of lubricating oil, J / (kg·℃); r: density of lubricating oil, g / cm 3 ; ΔT=T1-T0, ℃.

3. The new energy vehicle transmission lubrication system according to claim 1 is characterized in that: One end of the oil delivery pipe (8) is connected to the oil pump (17), and the other end extends into the transmission housing (1) to form branches (4) respectively connected to the oil collecting tank (5), and each branch (4) is provided with a flow automatic control valve (3).

4. The new energy vehicle transmission lubrication system according to claim 1, characterized in that: The oil collecting tank (5) is V-shaped, and an oil discharge port is arranged at the lowest point, and the oil discharge port is connected to the oil guide pipe (6).

5. The new energy vehicle transmission lubrication system according to claim 1, characterized in that: The invention comprises a second oil groove (10), the second oil groove (10) is arranged in a transmission housing (1), and is connected to a first oil groove (13) through a control valve (11); a second temperature sensor (12) is arranged in the first oil groove (13), The control valve (11) and the second temperature sensor (12) are both connected to a controller, and the controller controls the opening or closing of the control valve (11) according to the oil temperature in the first oil tank (13) detected by the second temperature sensor (12).

6. The new energy vehicle transmission lubrication system according to claim 1, characterized in that: The invention comprises a second oil groove (10), the second oil groove (10) is arranged in a transmission housing (1), and is connected to a first oil groove (13) through a control valve (11); a liquid level sensor is arranged in the first oil groove (13), The first oil tank (13) and the liquid level sensor are both connected to a controller, and the controller controls the opening or closing of the control valve (11) according to the lubricating oil liquid level in the first oil tank (13) detected by the liquid level sensor.

7. The new energy vehicle transmission lubrication system according to claim 5 or 6, characterized in that: The second oil tank (10) is connected to the first oil tank (13) via a connecting pipe arranged at the bottom of the second oil tank (10), and a control valve (11) is arranged on the connecting pipe. The control valve (11) is an electromagnetic control valve.

8. The new energy vehicle transmission lubrication system according to claim 7 is characterized in that: The second temperature sensor (12) or the liquid level sensor is arranged at the outlet of the control valve (11).

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