Lubricating system of vehicle, control method of lubricating system and vehicle

Abstract

The invention discloses a lubricating system of a vehicle, a control method of the lubricating system and the vehicle, the lubricating system of the vehicle comprises two independently-driven drive axles, the drive axles comprise gearboxes, and lubricating oil is injected into the gearboxes; the driving structure is selectively in power connection with the wheels, the driving structure comprises a transmission gear set for power transmission, and the transmission gear set is rotationally supported in the gearbox through a bearing part; when one of the two drive axles drives the corresponding wheel to rotate, the drive structure of the other drive axle is disconnected with power of the wheel, and the drive structure is suitable for driving lubricating oil to lubricate the transmission gear set and the bearing piece. According to the embodiment of the invention, when the power connection between the driving structure and the wheel is cut off, the torque is input to the driving structure, so that the transmission gear set of the driving structure stirs the oil, the bearing part is lubricated after stirring, and the problem of dry grinding damage of the bearing part when the wheel of a non-driving axle is reversely dragged can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a lubrication system of a vehicle, a control method of the lubrication system and a vehicle. Background Art

[0002] Some two-axle vehicles normally drive both axles at the same time. In special circumstances, one axle does not participate in the driving. At this time, the driving torque of the axle not participating in the driving is 0. The axle not participating in the driving is also referred to as the "non-driven axle". The shift fork of the non-driven axle is disengaged and returns to neutral. At this time, part of the hardware inside the gearbox is connected to the drive motor, and the rotation of the drive motor can drive the gears to rotate; part of the hardware is connected to the wheels, and the gears and bearings are driven to rotate when the wheels are dragged back.

[0003] That is, when a dual-axle vehicle is driving with one axle, the undriven axle is dragged in reverse. At this time, the directly connected part of the wheel of the undriven axle rotates with it, the lubricating oil level is low, and the bearing parts that rotate with the wheel will be dry-fried. After running at a high speed for a period of time, the bearing parts will be damaged. However, the existing technology has high lubrication costs for bearing parts, or the software limits the maximum speed of the vehicle, which will reduce the driving performance of the vehicle. Therefore, there is room for improvement in the lubrication of bearing parts. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a lubrication system of a vehicle and a control method of the lubrication system, wherein when the lubrication system of the vehicle disconnects the power connection with the wheel through the drive structure, the drive structure is input with torque, so that the transmission gear set of the drive structure stirs the oil to lubricate the bearing after stirring, thereby avoiding the problem of dry wear damage to the bearing when the wheel of the non-driven axle is reversely dragged.

[0005] According to the lubrication system of a vehicle in an embodiment of the present invention, the vehicle includes two independently driven drive axles, the drive axles include a gearbox, and the gearbox is filled with lubricating oil; a drive structure, the drive structure is selectively connected to the wheels by power, the drive structure includes a transmission gear set for power transmission, and the transmission gear set is rotatably supported in the gearbox through a bearing member; wherein, when one of the two drive axles drives the corresponding wheel to rotate, the drive structure of the other drive axle is disconnected from the wheel power and the drive structure is suitable for driving the lubricating oil to lubricate the transmission gear set and the bearing member.

[0006] According to the lubrication system of the vehicle of the embodiment of the present invention, when one of the two driving axles drives the wheels to rotate, the other non-driven axle disconnects the power transmission from the wheels, that is, when the wheels of the non-driven axle are dragged to rotate under the drive of the driving axle, the bearing parts of the transmission gear set are worn due to the reverse dragging of the non-driven axle. By inputting torque into the driving structure of the non-driven axle, the driving structure drives the transmission gear set to rotate and stirs the oil in the gearbox to lubricate the structure in the gearbox, that is, to lubricate the bearing parts of the transmission gear set, thereby avoiding the problem of dry wear damage to the bearing parts during the reverse dragging of the non-driven axle.

[0007] According to the lubrication system of a vehicle of an embodiment of the present invention, the driving structure includes a driving motor and an input gear set, a first planetary gear set, a second planetary gear set and an output gear constituting the transmission gear set; the driving motor is connected to the first planetary gear set through the input gear set, the first planetary gear set is connected to the second planetary gear set, the second planetary gear set selectively fails to transmit power to the output gear, the output gear is connected to the wheel power, and the lubricating oil lubricates the corresponding bearings in the first planetary gear set, the second planetary gear set and / or the output gear.

[0008] According to the lubrication system of a vehicle according to an embodiment of the present invention, the first planetary gear set includes a first planetary gear, a first sun gear, a first ring gear and a first planet carrier; a plurality of the first planetary gears are meshed at intervals on the outer periphery of the first sun gear, the first ring gear is sleeved on the outer periphery of a plurality of the first planetary gears, and a plurality of the first planetary gears are connected through the first planet carrier, the input gear set transmits power to the first ring gear through the first sun gear and the first planetary gears, the first ring gear outputs power to the second planetary gear set, and the lubricating oil is suitable for lubricating the bearing parts corresponding to the first planetary gears.

[0009] According to the lubrication system of a vehicle according to an embodiment of the present invention, the second planetary gear set includes a second planetary gear, a second sun gear, a second ring gear and a second planet carrier; a plurality of the second planetary gears are meshed at intervals on the outer periphery of the second sun gear, the second ring gear is sleeved on the outer periphery of the plurality of the second planetary gears, the second planet carrier is connected to the output gear, the first ring gear is power-connected to the second sun gear, the second planetary gear selectively fails in power transmission with the second planet carrier, the second planet carrier is connected to the output gear, and the lubricating oil is suitable for lubricating the bearings corresponding to the second planetary gears.

[0010] According to the lubrication system for a vehicle according to an embodiment of the present invention, a first oil suction structure is integrated into the transmission shaft of the first sun gear.

[0011] According to the lubrication system of the vehicle of the embodiment of the present invention, the gearbox further includes a second oil suction structure, and the second oil suction structure is used to extract the lubricating oil to lubricate the bearing.

[0012] An embodiment of the present invention also discloses a control method for a vehicle's lubrication system, which is applicable to the lubrication system of the above-mentioned vehicle, and includes the following steps: determining whether active lubrication of the bearing component is required, and if so, turning on the active lubrication function; executing the active lubrication function; determining whether to turn off the lubrication function, and if so, turning off the lubrication function.

[0013] According to the control method of the lubrication system of a vehicle in an embodiment of the present invention, when it is determined that there is an undriven axle, which is equivalent to the risk of friction of the bearing parts at this time, the active lubrication function is turned on to lubricate the bearing parts in time, and when it is determined that the wear risk disappears, the lubrication function is turned off.

[0014] According to the control method of the lubrication system of a vehicle according to an embodiment of the present invention, the execution of the active lubrication function includes: outputting the torque of the drive motor according to the current vehicle speed to execute the lubrication function, the vehicle speed is V, the torque is T, there is a coefficient K∈[0,1), and it satisfies: T=k*V+T0, wherein T0 is the initial value, the unit of V is km / h, and the unit of T is nm.

[0015] According to the control method of the lubrication system of a vehicle in an embodiment of the present invention, the executing of the active lubrication function includes: dividing the current vehicle speed into intervals, each vehicle speed interval corresponding to an output torque of the driving motor.

[0016] According to the control method of the lubrication system of a vehicle in an embodiment of the present invention, shutting down the lubrication function includes: shutting down the lubrication function within 0-5 seconds when the vehicle speed is zero.

[0017] The embodiment of the present invention further discloses a vehicle, which is applicable to the control method of the lubrication system of the above-mentioned vehicle, wherein the two drive axles may be the front and rear axles in the longitudinal direction of the vehicle or the left and right axles in the transverse direction of the vehicle.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a simple schematic diagram of a lubrication system of a vehicle according to an embodiment of the present invention;

[0021] Figure 2is a schematic diagram of a specific structure of a lubrication system of a vehicle according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the main concept of the lubrication system of the vehicle according to the embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the main process of lubrication of the lubrication system of the vehicle according to the embodiment of the present invention.

[0024] Reference numerals:

[0025] A lubrication system 100 for a vehicle,

[0026] Drive motor 101, gearbox 102, transmission gear set 103, shift fork 104, bearing 105, wheel 106, liquid level 107, input gear set 1, first input gear 11, second input gear 12, third input gear 13, fourth input gear 14, first planetary gear set 2, first sun gear 21, first planetary carrier 22, first planetary gear 23, first ring gear 24, first sleeve 3, first oil suction structure 4, second sleeve 5, second planetary gear set 6, second sun gear 61, second planetary gear 62, second ring gear 63, second planetary carrier 64, output gear 7, differential 8, second oil suction structure 9. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Unless otherwise specified, the front-to-back direction in the present application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0031] Reference below Figure 1-Figure 4 The lubrication system 100 of a vehicle and the control method of the lubrication system according to an embodiment of the present invention are described. When the lubrication system 100 of the vehicle is disconnected from the wheel 106 by the drive structure, torque is input to the drive structure so that the transmission gear set 103 of the drive structure stirs the oil to lubricate the bearing 105 after stirring, thereby avoiding the dry wear damage of the bearing 105 during the reverse drag of the non-driven axle. The control method of the lubrication system 100 of the vehicle determines whether lubrication is required and controls the speed of the driving motor 101 to control the speed of the stirring oil, thereby achieving lubrication of the bearing 105 with lower energy consumption.

[0032] like Figure 1-4 As shown, according to a lubrication system 100 of a vehicle according to an embodiment of the present invention, the vehicle includes two independently driven drive axles, the drive axles include a gearbox 102, the gearbox 102 is filled with lubricating oil, and the lubrication system 100 of the vehicle further includes: a drive structure.

[0033] Among them, the driving structure is selectively connected to the wheel 106 by power, and the driving structure includes a transmission gear set 103 for power transmission, and the transmission gear set 103 is rotatably supported in the gearbox 102 through a bearing member 105; when one of the two driving axles drives the corresponding wheel 106 to rotate, the driving structure of the other driving axle is disconnected from the power of the wheel 106 and the driving structure is suitable for driving lubricating oil to lubricate the transmission gear set 103 and the bearing member 105.

[0034] In practice, for a double-axle vehicle with front and rear double axles, the driving force is usually provided by both axles together under normal driving conditions, which can provide better stability and escape ability, but in some cases a single axle is required to drive; when the driving axle is moving, it will drive the wheel 106 of the non-driven axle in reverse, that is, the wheel 106 of the non-driven axle is reversely dragged and rotates, causing the bearing 105 to dry grind, resulting in wear of the bearing 105, and the bearing 105 plays a role in supporting, reducing friction and ensuring smooth transmission in the transmission gear set 103 of the gearbox 102, and the wear of the bearing 105 will cause abnormal noise, temperature increase, and even displacement, thereby causing functional disorders of the gearbox 102.

[0035] The drive structure can selectively connect and transmit power to the wheel 106. When the drive structure is connected to the wheel 106 and power is transmitted, the axle is considered to be a drive axle, and when the drive structure is selectively disconnected from the wheel 106 and power cannot be output to the wheel 106, it is a non-drive axle; that is, the embodiment of the present invention is at least for a dual-axle vehicle, one of the axles is a drive axle, and the other axle is a non-drive axle.

[0036] Specifically, there is no power transmission between the driving structure of the non-driven axle and the wheel 106 at this time. On the basis of ensuring that there is lubricating oil in the gearbox 102, a smaller torque can be input into the driving structure of the non-driven axle through software, so that the driving structure drives the transmission gear set 103 in the gearbox 102 to rotate, and the bearing member 105 is the bearing member 105 supported by the transmission gear set 103. When the transmission gear set 103 rotates with a small torque, the transmission gear set 103 will stir the lubricating oil and lubricate each bearing member 105, thereby avoiding the bearing member 105 of the non-driven axle being driven by the driving axle and being dragged back and worn. At the same time, only a smaller torque needs to be input, which can also save energy consumption and achieve the effect of stirring the oil to lubricate the bearing member 105.

[0037] In some embodiments, the driving structure includes a driving motor 101 and an input gear set 1, a first planetary gear set 2, a second planetary gear set 6 and an output gear 7 that constitute a transmission gear set 103; the driving motor 101 is connected to the first planetary gear set 2 through the input gear set 1, the first planetary gear set 2 is connected to the second planetary gear set 6, the second planetary gear set 6 selectively blocks power transmission with the output gear 7, the output gear 7 is connected to the wheel 106, and the lubricating oil lubricates the corresponding bearings 105 in the first planetary gear set 2, the second planetary gear set 6 and / or the output gear 7.

[0038] Reference Figure 1 As shown, Figure 1This is a schematic diagram of an embodiment of the present invention, that is, when torque is input to the drive motor 101, the drive motor 101 drives the transmission gear set 103 in the gearbox 102 to transmit power, and the transmission gear set 103 can be controlled by the shift fork 104 to selectively disconnect the power transmission between some gears of the transmission gear set 103 and the wheel 106, and the power transmission between some gears and the drive motor 101 is normal. Figure 1 The bearing member 105 in the embodiment can represent Figure 2 The bearing parts 105 corresponding to each gear in the embodiment are shown in the figure. The bearing parts 105 at this time are only schematic diagrams.

[0039] Specifically, refer to Figure 2 As shown, the transmission gear set 103 includes an input gear set 1, a first planetary gear set 2, a second planetary gear set 6 and an output gear 7, wherein the input gear set 1 may include a first input gear 11, a second input gear 12 and a third input gear 13, the output end of the drive motor 101 is power-connected to the first input gear 11, the first input gear 11 is power-connected to the second input gear 12, the second input gear 12 is power-connected to the third input gear 13, and the third input gear 13 is connected to the first planetary gear set 2, so that the power of the drive motor 101 is transmitted to the first planetary gear set 2 through the input gear set 1, the first planetary gear set 2 transmits the power to the second planetary gear set 6, and whether to transmit power to the wheel 106 is determined by the second planetary gear set 6.

[0040] Then, the second planetary gear set 6 and the output gear 7 can be selectively connected or disconnected, which is a non-driven axle, that is, the power transmission between the second planetary gear set 6 and the output gear 7 fails, and the power cannot be output to the output gear 7, and the power cannot be output to the wheel 106 through the output gear 7 and the differential 8. That is, the drive motor 101 transmits power to the first planetary gear set 2, and the first planetary gear set 2 transmits power to the second planetary gear set 6, and the first planetary gear set 2 drives part of the structure of the second planetary gear set 6 to rotate while stirring the lubricating oil. At this time, the lubricating oil can lubricate the bearing components 105 corresponding to the first planetary gear set 2, the second planetary gear set 6 and the output gear 7 to avoid dry grinding of these bearing components 105 when they are dragged back by the drive axle.

[0041] In some embodiments, the first planetary gear set 2 includes a first planetary gear 23, a first sun gear 21, a first ring gear 24 and a first planet carrier 22; a plurality of first planetary gears 23 are meshed at intervals on the outer periphery of the first sun gear 21, the first ring gear 24 is sleeved on the outer periphery of the plurality of first planetary gears 23, the plurality of first planetary gears 23 are connected through the first planet carrier 22, the input gear set 1 transmits power to the first ring gear 24 through the first sun gear 21 and the first planetary gear 23, the first ring gear 24 outputs power to the second planetary gear set 6, and the lubricating oil is suitable for lubricating the bearings 105 corresponding to the first planetary gears 23.

[0042] Continue to refer to Figure 2 As shown, in practice, the third output gear 7 is connected to the transmission shaft of the first sun gear 21 by power, and the transmission shaft of the first sun gear 21 is also connected to the fourth input gear 14 by power. The transmission shaft of the first sun gear 21 is connected to the third input gear 13 and the fourth input gear 14 by power. A plurality of first planetary gears 23 are arranged around the first sun gear 21, and the plurality of first planetary gears 23 are connected through the first planet carrier 22. The first planet carrier 22 is connected to the first sleeve 3, and is selectively connected to the fourth input gear 14 or the gearbox 102 through the first sleeve 3. Different positions of the first sleeve 3 can make the torque output by the first planetary gear set 2 different, that is, the first sleeve 3 is mainly used for shifting gears. When the first planet carrier 22 is selectively connected to the gearbox 102 through the first sleeve 3, after the power of the third input gear 13 is transmitted to the first sun gear 21, the first planetary gear 23 is driven to rotate by the rotation of the first sun gear 21. At this time, the first planetary gear 23 does not revolve, thereby driving the first ring gear 24 to rotate, and the first ring gear 24 can transmit power to the second planetary gear set 6.

[0043] Alternatively, when the first planetary carrier 22 is selectively connected to the fourth input gear 14 through the first sleeve 3, the rotation of the third input gear 13 can drive the first sun gear 21 to rotate. The rotation of the first sun gear 21 drives the first planetary gear 23 to rotate while also revolving around the first ring gear 24, and outputs power to the first ring gear 24. The first ring gear 24 then outputs power to the second planetary gear set 6. That is, no matter the first sleeve 3 is connected to the gearbox 102 or the fourth input gear 14, it can transmit power to the second planetary gear set 6 through the first ring gear 24. When the first planetary gear set 2 rotates, the lubricating oil can be stirred to lubricate the bearing component 105 corresponding to the first planetary gear set 2. Of course, part of the oil will also lubricate the bearing component 105 corresponding to the second planetary gear set 6 during the splashing process.

[0044] In some embodiments, the second planetary gear set 6 includes a second planetary gear 62, a second sun gear 61, a second ring gear 63 and a second planet carrier 64; a plurality of second planetary gears 62 are meshed at intervals on the outer periphery of the second sun gear 61, the second ring gear 63 is sleeved on the outer periphery of the plurality of second planetary gears 62, the second planet carrier 64 is connected to the output gear 7, the first ring gear 24 is power-connected to the second sun gear 61, the second planetary gear 62 selectively fails in power transmission with the second planet carrier 64, the second planet carrier 64 is connected to the output gear 7, and the lubricating oil is suitable for lubricating the bearings 105 corresponding to the second planetary gears 62.

[0045] Continue to refer to Figure 2 As shown, Figure 2 The scissors in the figure represent the direction of power transmission. When power is transmitted from the first ring gear 24 of the first planetary gear set 2 to the second sun gear 61, the second sun gear 61 rotates, and the second sleeve 5 is connected to the second ring gear 63. The second ring gear 63 can be selectively connected to the gearbox 102 or the transmission shaft of the second sun gear 61 through the second sleeve 5.

[0046] When the second sliding sleeve 5 is in neutral, that is, the second sliding sleeve 5 is neither connected to the gearbox 102 nor connected to the transmission shaft power of the second sun gear 61, then when the second sun gear 61 and the transmission shaft rotate, the second sun gear 61 can drive the second planetary gear 62 to rotate, and the second planetary gear 62 also drives the second ring gear 63 to rotate, that is, at this time the second planetary gear 62 does not revolve, then the second planetary gear 62 cannot drive the second planetary carrier 64 to rotate, and the second planetary carrier 64 is connected to the output gear 7 in power, when the second planetary carrier 64 rotates, it drives the output gear 7 to rotate so that the gear When the wheel 106 rotates, the second planetary gear 62 does not drive the second planetary carrier 64 to rotate, and the power transmission between the wheel 106 fails. At this time, it is equivalent to that the driving motor 101 outputs a smaller torque to drive the partial structure of the second planetary gear set 6 to rotate through the first planetary gear set 2, thereby stirring the lubricating oil. Since the first sun gear 21 and the second sun gear 61 are directly connected to the corresponding transmission shaft, no bearing 105 is set. That is, after stirring, the lubricating oil can mainly lubricate the first planetary gear 23, the second planetary gear 62 and the bearing 105 corresponding to the output gear 7.

[0047] When the second ring gear 63 is connected to the gearbox 102 through the second sleeve 5, that is, the second ring gear 63 is stationary, when the second sun gear 61 rotates, it will drive the second planetary gears 62 to rotate and revolve around the inner ring gear of the second ring gear 63, thereby driving the second planetary carrier 64 to rotate, that is, the power is transmitted to the output gear 7 through the second planetary carrier 64, thereby transmitting the power to the wheel 106; similarly, when the second ring gear 63 is connected to the transmission shaft of the second sun gear 61 through the second sleeve 5, the rotation of the second sun gear 61 drives the second ring gear 63 to rotate as a whole, and at the same time, the second planetary gears 62 also revolve, driving the second planetary carrier 64 to rotate, so as to output the power to the output gear 7, thereby transmitting the power to the wheel 106. At this time, the non-driven axle becomes the driven axle, and the embodiment of the present invention is mainly aimed at the lubrication of the bearing member 105 of the non-driven axle, that is, the second sleeve 5 is in neutral.

[0048] It should be noted that the sliding movement of the first sliding sleeve 3 and the second sliding sleeve 5 can be Figure 1 The shift fork 104 is used to realize the shifting of the gears, that is, the shift fork 104 is equivalent to the function of switching the gears.

[0049] In some embodiments, the transmission shaft of the first sun gear 21 is integrated with a first oil suction structure 4. The first oil suction structure 4 may be an oil passage integrated on the transmission shaft of the first sun gear 21. When the first sun gear 21 rotates, the first oil suction structure 4 sucks the oil to the position of the transmission shaft of the first sun gear 21 by the power of rotation, so that during the rotation of the transmission shaft of the first sun gear 21, the lubricating oil flows to the bearing member 105 corresponding to the first planetary gear 23 to lubricate the bearing member 105 corresponding to the first planetary gear 23; of course, when the oil passage is long enough and the lubricating oil is stirred, the lubricating oil splashes to the bearing member 105 corresponding to the second planetary gear 62 and the bearing member 105 corresponding to the output gear 7.

[0050] In addition, the first oil suction structure 4 can also be an oil pump integrated on the transmission shaft of the first sun gear 21. The oil pump is directly connected to the transmission shaft of the first sun gear 21, and the oil pump is driven to work by the rotation of the transmission shaft of the first sun gear 21. This design can reduce transmission components, simplify system structure, improve efficiency, and realize lubrication of the bearing 105 by oil. Common oil pumps integrated on the shaft include gear pumps and plunger pumps.

[0051] In some embodiments, the gearbox 102 further includes a second oil suction structure 9 , which is used to extract the lubricating oil to lubricate the bearing 105 .

[0052] That is, the second oil suction structure 9 can be an extraction pump in the gearbox 102. When the bearing 105 needs to be lubricated, it can also be extracted and lubricated through the second oil suction structure 9. The second oil suction structure 9 can be set at any free position in the gearbox 102. When the first oil suction structure 4 is working, it can only be applied to the forward gear, that is, under normal oil suction conditions, the oil pump can only rotate in one direction. By setting the second oil suction structure 9, the gearbox can be lubricated through the second oil suction structure 9 when in reverse gear, so that the bearing 105 can be lubricated under different conditions of the vehicle.

[0053] The embodiment of the present invention further discloses a control method of a vehicle lubrication system 100, which is applicable to the above-mentioned vehicle lubrication system 100 and includes the following steps:

[0054] like Figure 4 As shown: S1: Determine whether active lubrication of the bearing 105 is required, and if so, turn on the active lubrication function.

[0055] In practice, when one or more bridges in a dual-bridge or multi-bridge structure do not need to be driven, the reason for not needing to be driven may be a fault or a function shutdown. At this time, the software can generate a flag Flag = 1, and the software can determine whether to turn on the active lubrication function based on this flag and the current vehicle speed V. In the if statement, if flag = 1, a specific code block is executed.

[0056] If Flag=1 and V=0km / h, the function enable flag Enable=1 or Enable=0, the active lubrication function can be enabled or disabled; if Flag=1 and V>0km / h, the function enable flag Enable=1, the active lubrication function is enabled. If Flag=0 and V=any value, the function enable flag Enable=0, the active lubrication function is disabled.

[0057] In the computer field, enable=1 indicates that a function or option is enabled, and enable=0 indicates that a function or option is disabled. That is, only when there is a non-driven axle, the bearing member 105 corresponding to the non-driven axle will be driven by the wheel 106 of the non-driven axle and dry grinding will occur. The above method is used to determine whether there is a non-driven axle, and when there is a non-driven axle, the function of lubricating the bearing member 105 with lubricating oil is turned on.

[0058] S2: Execute active lubrication function; when executing the active lubrication function, the above-mentioned drive motor 101 is driven to work, so that the drive motor 101 drives the first planetary gear set 2 to work, and drives the second planetary gear set 6 to work through the first planetary gear set 2 to stir the lubricating oil and realize the lubrication function.

[0059] In addition, it should be noted that when lubrication is performed, the liquid level 107 of the lubricating oil is below the entire first planetary gear 23 and the second planetary gear 62, preventing the first planetary gear 23 and the second planetary gear 62 from rotating poorly due to the resistance of the lubricating liquid during rotation. That is, the liquid level 107 is set below the first planetary gear 23 and the second planetary gear 62, thereby improving the operating efficiency of the transmission gear set 103 in the gearbox 102.

[0060] S3: Determine whether to turn off the lubrication function. If so, turn off the lubrication function. When the vehicle recognizes that Flag = 0, the active lubrication function can be turned off; or when the vehicle recognizes that Flag = 1 and the current vehicle speed V = 0, the active lubrication function is turned off in time or with a delay of t = 5s; by monitoring whether lubrication is performed at any time, it is prevented that lubrication is still performed when there is no dry grinding of the bearing part 105, thereby increasing the operating energy consumption of the drive motor 101, that is, when the dry grinding phenomenon stops, the lubrication function can be turned off.

[0061] In some embodiments, executing the active lubrication function includes: outputting the torque of the drive motor 101 according to the current vehicle speed to execute the lubrication function, the vehicle speed is V, the torque is T, there is a coefficient K∈[0,1), and it satisfies: T=k*V+T0, where T0 is the initial value, such as the initial value of T0 is 5n.m, the unit of V is km / h, and the unit of T is nm.

[0062] In practice, when the current vehicle speed V=0, K=0; when the current vehicle speed V>0, the larger V is, the larger T is, and the K value can be calculated based on simulation or actual calibration.

[0063] When the vehicle speed corresponding to the drive axle is faster, the corresponding drive axle will drive the non-driven axle to move faster, that is, the friction frequency of the bearing part 105 of the non-driven axle is higher; and by making the torque output by the drive motor 101 correspond to the vehicle speed of the wheel 106 of the drive axle, that is, when the vehicle speed is higher, the torque output by the drive motor 101 is greater, the speed of stirring the lubricating oil is faster, and the lubricating oil enters the bearing part 105 more evenly and faster to lubricate the bearing part 105 in real time, thereby increasing the service life of the bearing part 105; that is, when the vehicle speed is low, there is no need to set a larger torque, and a smaller torque can be set according to the change of vehicle speed, which can reduce the energy consumption of the drive motor 101 and the transmission gear set 103. The main concept of performing active lubrication function is as follows: Figure 3 As shown, the active lubrication function of the embodiment of the present invention is selectively performed according to single-bridge driving or double-bridge driving.

[0064] In some embodiments, executing the active lubrication function includes: dividing the current vehicle speed into intervals, each vehicle speed interval corresponding to an output torque of the drive motor 101 .

[0065] In practice, the vehicle speed is V, such as V∈(0,30], T=T1; V∈(30,60], T=T2; V∈(60, vehicle speed upper limit], T=T3; wherein the specific value of T can be obtained based on simulation or actual durability calibration; that is, in the first vehicle speed range, the torque output by the drive motor 101 is the first torque, and the torque value remains constant; the vehicle speed is in the second vehicle speed range, the torque output by the drive motor 101 is the second torque, and the torque value remains constant; the vehicle speed is in the third vehicle speed range, the torque output by the drive motor 101 is the third torque, and the torque value remains constant. Then, the output torque of the drive motor 101 does not need to change at any time, but rotates constantly when the set first vehicle speed range is reached, and starts to change after reaching the second vehicle speed range, and rotates constantly again in the second speed range, which makes it more convenient in software design, and can also better lubricate the bearing 105 in real time.

[0066] In some embodiments, shutting down the lubrication function includes: shutting down the lubrication function within 0-5 seconds when the vehicle speed is zero.

[0067] That is, when the driving structure of the driving axle stops running, the driving axle gradually makes the reverse drag force of the non-driving axle disappear, and the corresponding influence on the bearing part 105 disappears, that is, at this time, the driving motor 101 of the non-driving axle can be controlled to stop, and the action of stirring the lubricating oil to lubricate the bearing part 105 can be stopped. When controlling the driving motor 101, the lubrication function can be turned off within 5 seconds, which not only gives the vehicle control system time to react, but also ensures that the bearing part 105 is effectively and fully lubricated before stopping lubrication.

[0068] The embodiment of the present invention further discloses a vehicle, which is applicable to the control method of the lubrication system 100 of the above-mentioned vehicle, wherein the two drive axles may be the front and rear axles in the longitudinal direction of the vehicle or the left and right axles in the transverse direction of the vehicle.

[0069] The driving axle and the non-driven axle in the embodiment of the present invention can be front and rear axles or left and right axles. When it is a front and rear axle, for example, the rear axle is driven, the front axle is not driven, and the wheels 106 of the front axle are driven by the rear driving axle to move together; or the rear axle is not driven, the front axle is driven, and the wheels 106 of the rear axle are driven by the front driving axle to move together; if it is a left and right axle, it is equivalent to the left and right half-axles of the vehicle, the left half-axle drives the wheel 106 on the left side, and the right half-axle does not drive the wheel 106 on the right side, the non-driven wheel 106 is driven to rotate by the actively driven wheel 106, and the transmission gear set 103 of the non-driven wheel 106 also has the corresponding dry grinding problem of the bearing 105, that is, when it is not limited to the front and rear driving axles or the left and right driving axles, the adaptability of the lubrication system is wider, and the dry grinding phenomenon of the transmission gear set 103 of the non-driven axle can be carried out accordingly.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lubrication system (100) for a vehicle, characterized in that: The vehicle comprises two independently driven drive axles, the drive axles comprising a gearbox (102), and the gearbox (102) is filled with lubricating oil; A driving structure, the driving structure being selectively power-connected to the wheel (106), the driving structure comprising a transmission gear set (103) for power transmission, the transmission gear set (103) being rotatably supported in the gearbox (102) via a bearing member (105); When one of the two drive axles drives the corresponding wheel (106) to rotate, the drive structure of the other drive axle is disconnected from the power of the wheel (106) and the drive structure is suitable for driving lubricating oil to lubricate the transmission gear set (103) and the bearing member (105).

2. The vehicle lubrication system (100) according to claim 1, characterized in that: The driving structure comprises a driving motor (101) and an input gear set (1), a first planetary gear set (2), a second planetary gear set (6) and an output gear (7) constituting the transmission gear set (103); The drive motor (101) is connected to the first planetary gear set (2) through the input gear set (1), the first planetary gear set (2) is connected to the second planetary gear set (6), the second planetary gear set (6) selectively fails to transmit power to the output gear (7), the output gear (7) is connected to the wheel (106), and the lubricating oil lubricates the corresponding bearings (105) in the first planetary gear set (2), the second planetary gear set (6) and / or the output gear (7).

3. The lubrication system (100) for a vehicle according to claim 2, characterized in that: The first planetary gear set (2) comprises a first planetary gear (23), a first sun gear (21), a first ring gear (24) and a first planet carrier (22); A plurality of the first planetary gears (23) are meshed with each other at intervals on the outer periphery of the first sun gear (21); the first ring gear (24) is sleeved on the outer periphery of the plurality of the first planetary gears (23); the plurality of the first planetary gears (23) are connected via a first planet carrier (22); the input gear set (1) transmits power to the first ring gear (24) via the first sun gear (21) and the first planetary gears (23); the first ring gear (24) outputs power to the second planetary gear set (6); and the lubricating oil is suitable for lubricating the bearing member (105) corresponding to the first planetary gear (23).

4. The vehicle lubrication system (100) according to claim 3, characterized in that: The second planetary gear set (6) comprises a second planetary gear (62), a second sun gear (61), a second ring gear (63) and a second planet carrier (64); A plurality of second planetary gears (62) are meshed at intervals on the outer periphery of the second sun gear (61); the second ring gear (63) is sleeved on the outer periphery of the plurality of second planetary gears (62); the second planet carrier (64) is connected to the output gear (7); the first ring gear (24) is power-connected to the second sun gear (61); the second planetary gear (62) selectively fails in power transmission with the second planet carrier (64); the second planet carrier (64) is connected to the output gear (7); and the lubricating oil is suitable for lubricating the bearing member (105) corresponding to the second planetary gear (62).

5. The lubrication system (100) for a vehicle according to claim 3, characterized in that: The transmission shaft of the first sun gear (21) is integrated with a first oil suction structure (4).

6. The lubrication system (100) for a vehicle according to claim 1, characterized in that: The gearbox (102) also includes a second oil suction structure (9), and the second oil suction structure (9) is used to extract the lubricating oil to lubricate the bearing component (105).

7. A method for controlling a lubrication system (100) of a vehicle, characterized in that: A lubrication system (100) for a vehicle according to any one of claims 1 to 6, comprising the following steps: Determining whether active lubrication of the bearing member (105) is required, and if so, starting the active lubrication function; Perform active lubrication functions; Determine whether to turn off the lubrication function, if so, turn off the lubrication function.

8. The control method of the vehicle lubrication system (100) according to claim 7, characterized in that: The active lubrication function comprises: outputting the torque of the drive motor (101) according to the current vehicle speed to perform the lubrication function, the vehicle speed is V, the torque is T, there is a coefficient K∈[0,1), and it satisfies: T=k*V+T0, wherein T0 is an initial value, the unit of V is km / h, and the unit of T is nm.

9. The control method of the vehicle lubrication system (100) according to claim 7, characterized in that: The active lubrication function is performed including dividing the current vehicle speed into intervals, each vehicle speed interval corresponding to an output torque of the drive motor (101).

10. The control method of the lubrication system (100) of a vehicle according to claim 7, characterized in that: The shutting down of the lubrication function includes: shutting down the lubrication function within 0-5 seconds when the vehicle speed is zero.

11. A vehicle, applicable to the control method of the lubrication system (100) of the vehicle according to any one of claims 7 to 10, characterized in that: The two drive axles may be front and rear axles in the longitudinal direction of the vehicle or left and right axles in the transverse direction of the vehicle.

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