A drive axle lubrication system and a grader

Abstract

The application discloses a driving axle lubricating system and a motor grader, and belongs to the technical field of engineering machinery. The lubricating oil from the bevel gear stirring oil end side is conducted to the second installation cavity from the first installation cavity through the oil guide channel, so that the second bearing can be lubricated. Meanwhile, the lubricating oil thrown to the inner cavity wall from the bevel gear stirring oil end is collected by the oil collecting groove and the oil pressure is increased, so that the first one-way valve is opened. The lubricating oil collected at the oil collecting groove enters the external oil pipe through the first one-way valve and finally flows into the second installation cavity to lubricate the second bearing. Therefore, the second bearing far away from the oil pool can also be effectively lubricated during the operation of the driving axle, and the problem that the bearing is prone to heating due to the failure to be effectively lubricated is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a drive axle lubrication system and a motor grader, and belongs to the technical field of engineering machinery. BACKGROUND

[0002] For a speed reducer operating at high speed, the shaft rotates at a high speed, the bearing generates a large amount of heat, and oil lubrication and air passage cap air cooling are required. The common lubrication method is self-lubrication, that is, the oil is thrown out during the rotation of the gear, and the thrown oil is collected and guided to the bearing for lubrication. Although this method can effectively lubricate the bearing close to the oil throwing end of the gear, the lubrication effect of the bearing away from the oil throwing end of the gear is limited, and the bearing that cannot be effectively lubricated still has the problem of insufficient lubrication and easy heating. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art and provide a drive axle lubrication system and a motor grader, which can effectively lubricate the bearing away from the oil throwing end of the gear, and avoid the problem of easy heating due to insufficient lubrication.

[0004] To achieve the above-mentioned purpose / To solve the above-mentioned technical problems, the present application adopts the following technical scheme:

[0005] A drive axle lubrication system, comprising an axle housing and a main reduction module arranged on one side of the axle housing;

[0006] The axle housing is provided with an inner cavity, an oil inlet and an oil outlet connected with the inner cavity, and the inner cavity is filled with lubricating oil to form an oil pool;

[0007] The inner cavity is provided with a main bevel gear, and the main reduction module comprises a driven bevel gear connected with the main bevel gear, a bearing seat, a first bearing, a second bearing and an oil seal mechanism for sealing the bearing seat in the inner cavity;

[0008] The bearing seat is provided with a first mounting cavity for mounting the first bearing and a second mounting cavity for mounting the second bearing;

[0009] The driven bevel gear comprises a driven shaft, and the first bearing and the second bearing are connected with the driven bevel gear through the driven shaft;

[0010] The first bearing is located at one end of the driven shaft close to the oil pool;

[0011] The bearing seat is provided with an oil guiding channel for guiding the lubricating liquid from the first mounting cavity to the second mounting cavity;

[0012] The inner cavity corresponds to one side of the connection between the main bevel gear and the satellite bevel gear, and is provided with an oil collecting groove, the oil collecting groove is connected with an external oil pipe, one end of the external oil pipe close to the oil collecting groove is provided with a first one-way valve, and the other end of the external oil pipe away from the oil collecting groove is connected with a second installation cavity.

[0013] Optionally, the oil guide channel is inclined.

[0014] Optionally, the oil guide channel is tapered.

[0015] Optionally, the oil guide channel comprises a first channel and a second channel in communication with the first channel, the first channel is in communication with the first installation cavity, the second channel is in communication with the second installation cavity, and the aperture of the first channel is smaller than the aperture of the second channel.

[0016] Optionally, the opening pressure value of the first one-way valve is 0.2 bar.

[0017] Optionally, the oil collecting groove is provided with an oil collecting plate for quickly forming oil pressure in the oil collecting groove.

[0018] Optionally, the oil collecting plate comprises a vertical plate and an arc-shaped plate connected with the vertical plate; the vertical plate is opposite to the oil throwing direction of the main bevel gear, and the arc-shaped plate is opposite to the oil throwing direction of the satellite bevel gear.

[0019] Optionally, the speed reduction module further comprises an oil return mechanism.

[0020] The oil return mechanism comprises an oil return port provided on one side of the axle housing and in communication with the inner cavity, a first through hole provided on the bearing seat and in communication with the second installation cavity, a second through hole provided on the bearing seat and in communication with the second installation cavity, a second one-way valve connected with the first through hole, a third one-way valve connected with the second through hole, an electromagnetic reversing valve connected with the second one-way valve and the third one-way valve, an oil pump connected with the electromagnetic reversing valve, an oil return pipe, a temperature sensor and a controller.

[0021] One end of the oil return pipe is connected with the oil return port, and the other end of the oil return pipe is connected with the oil pump.

[0022] A check valve is arranged at one end of the oil return pipe close to the oil return port.

[0023] The axle housing is inclined, and the lubricating oil in the oil pool enters the oil return pipe.

[0024] The temperature sensor is arranged in the second installation cavity.

[0025] The temperature sensor, the electromagnetic reversing valve and the oil pump are connected with the controller.

[0026] Optionally, the opening pressure of the second one-way valve and the third one-way valve is 0.2 bar.

[0027] The present application also provides a motor grader comprising the driving axle lubrication system.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1、The present application uses the oil guide channel to guide the lubricating oil from the bevel gear stirring oil end side to the second installation cavity through the first installation cavity, so that the second bearing can be lubricated, and the lubricating oil splashed to the inner cavity wall from the bevel gear stirring oil end is collected by the oil collecting groove and the oil pressure is increased, so that the first one-way valve is opened, the lubricating oil collected at the oil collecting groove enters the external oil pipe through the first one-way valve, and finally flows into the second installation cavity to lubricate the second bearing, so that the second bearing away from the oil pool can also be effectively lubricated during the operation of the driving axle, and the problem of easy heating of the bearing due to ineffective lubrication is solved.

[0030] 2、The present application also uses the characteristics that the oil level in the axle housing is inclined during uphill driving of the vehicle, and the inclined oil level flows into the oil return port, so that the second bearing cannot be effectively lubricated due to the backflow of the oil in the second installation cavity, and the temperature in the second installation cavity rises, and when the temperature meets the preset temperature threshold, the corresponding second one-way valve and third one-way valve of the electromagnetic reversing valve are opened in turn, the oil pump is started, and the lubricating oil enters the second oil cavity through the second one-way valve and the third one-way valve respectively to lubricate the second bearing, thereby avoiding the problem that the bearing cannot be effectively lubricated due to the backflow of the lubricating oil during uphill driving of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a whole structure schematic diagram of a driving axle lubrication system provided by an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of an oil guide channel in a driving axle lubrication system provided by an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of a bearing seat in a driving axle lubrication system provided by an embodiment of the present application (showing a first through hole and a second through hole);

[0034] Figure 4 is Figure 3 is a sectional view of section M-M;

[0035] Figure 5 is a schematic diagram of an external oil pipe in a driving axle lubrication system provided by an embodiment of the present application;

[0036] Figure 6 is a schematic diagram of an oil collecting plate in a driving axle lubrication system provided by an embodiment of the present application;

[0037] Figure 7is a kind of oil level schematic diagram in the interior of driving axle lubrication system when it is on the whole vehicle uphill provided by the embodiment of the present application;

[0038] Figure 8 is a kind of hydraulic circuit schematic diagram of the oil return mechanism of driving axle lubrication system provided by the embodiment of the present application;

[0039] Figure 9 is a kind of schematic diagram of the oil return mechanism of driving axle lubrication system provided by the embodiment of the present application.

[0040] In the figure: 1, axle housing;101, inner cavity;102, oil filler;103, oil drain;104, main bevel gear;2, main reduction module;201, driven bevel gear;2011, driven axle;202, bearing seat;203, first bearing;204, second bearing;205, oil seal mechanism;206, first mounting cavity;207, second mounting cavity;2081, oil return port;2082, first through hole;2083, second through hole;2084, second one-way valve;2085, third one-way valve;2086, electromagnetic reversing valve;2087, oil pump;2088, oil return pipe;2089, temperature sensor;3, oil guide channel;301, first channel;302, second channel;4, oil collecting groove;5, external oil pipe;6, first one-way valve;7, oil collecting plate;701, vertical plate;702, arc plate;8, oil tank;9, overflow valve;10, check valve. DETAILED DESCRIPTION

[0041] The present application is further described below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot limit the protection scope of the present application. EMBODIMENT

[0042] As Figure 1 shown, a kind of driving axle lubrication system, including axle housing 1 and the main reduction module 2 installed in one side of axle housing 1;Wherein axle housing 1 has inner cavity 101, inner cavity 101 top is provided with oil filler 102, oil filler 102 is installed with oil plug not shown, inner cavity 101 bottom is provided with oil drain 103, oil drain 103 is installed with oil plug not shown, inner cavity 101 is added lubricating oil by oil filler 102, lubricating oil is accumulated and forms oil pool at oil drain 103;Main bevel gear 104 is installed in inner cavity 101, the bottom of main bevel gear 104 is immersed in oil pool;

[0043] The deceleration module comprises a driven bevel gear 201 connected with the main bevel gear 104 in the inner cavity 101, a bearing seat 202, a first bearing 203, a second bearing 204 and an oil seal mechanism 205 for sealing the bearing seat 202; wherein the bearing seat 202 is provided with a first installation cavity 206 and a second installation cavity 207, the first installation cavity 206 is connected with the inner cavity 101, and the first bearing 203 and the second bearing 204 are respectively installed in the first installation cavity 206 and the second installation cavity 207;

[0044] The driven bevel gear 201 further comprises a driven wheel shaft 2011, the first bearing 203 and the second bearing 204 are connected with the driven bevel gear 201 through the driven wheel shaft 2011, and the first bearing 203 is located at one end of the driven wheel shaft 2011 close to the oil pool;

[0045] As shown in Figure 2 , the bearing seat 202 is provided with an oil guide channel 3 for guiding the lubricating liquid from the first installation cavity 206 to the second installation cavity 207, the oil guide channel 3 is tapered and inclined, and specifically:

[0046] As shown in Figure 3 and Figure 4 , the oil guide channel 3 comprises a first channel 301 and a second channel 302 communicated with the first channel 301, the first channel 301 is communicated with the first installation cavity 206, the second channel 302 is communicated with the second installation cavity 207, the aperture of the first channel 301 is smaller than that of the second channel 302, and the communication position of the second channel 302 with the second installation cavity 207 is lower than that of the first channel 301 with the first installation cavity 206; when the main bevel gear 104 and the driven bevel gear 201 operate, the oil pool is agitated, part of the lubricating oil is thrown out, the lubricating oil enters the first installation cavity 206 to lubricate the first bearing 203, and part of the lubricating oil in the first installation cavity 206 enters the second installation cavity 207 through the oil guide channel 3 to lubricate the second bearing 204, since the second bearing 204 is far away from the oil pool, the second bearing 204 far away from the oil pool can also be effectively lubricated in the operation process of the drive axle through the oil guide channel 3;

[0047] As shown in Figure 5As shown, in order to improve the lubrication effect of the second bearing 204, the inner cavity 101 is provided with an oil collecting groove 4 at one side corresponding to the connection between the main bevel gear 104 and the driven bevel gear 201, the oil collecting groove 4 is connected with an external oil pipe 5, one end of the external oil pipe 5 close to the oil collecting groove 4 is provided with a first one-way valve 6, the opening pressure value of the first one-way valve 6 is 0.2 bar, the other end of the external oil pipe 5 away from the oil collecting groove 4 is connected with the second installation cavity 207, when the main bevel gear 104 and the driven bevel gear 201 operate, the oil pool is agitated, part of the lubricating oil is thrown out, the thrown-out lubricating oil is gathered at the oil collecting groove 4 to form oil pressure and open the first one-way valve 6, the lubricating oil gathered at the oil collecting groove 4 enters the external oil pipe 5 through the first one-way valve 6, and finally flows into the second installation cavity 207 to lubricate the second bearing 204, so that the second bearing 204 away from the oil pool can also be effectively lubricated during the operation of the drive axle;

[0048] As shown in the drawings, Figure 6 As shown, in order to improve the oil collecting effect at the oil collecting groove 4, an oil collecting plate 7 is also installed in the oil collecting groove 4, specifically:

[0049] The oil collecting plate 7 includes a vertical plate 701 and an arc-shaped plate 702 connected with the vertical plate 701; the vertical plate 701 is opposite to the oil throwing direction of the main bevel gear 104, and the arc-shaped plate 702 is opposite to the oil throwing direction of the driven bevel gear 201, it should be noted that the vertical plate 701 and the arc-shaped plate 702 do not block the connection between the oil collecting groove 4 and the external oil pipe 5, the upper side of the arc-shaped plate 702 is used to receive and quickly accumulate the oil thrown out from the driven bevel gear 201, when the gear operates at high speed, a large amount of lubricating oil is thrown into the oil collecting groove 4, which is easy to quickly establish oil pressure and open the first one-way valve 6; the vertical plate 701 is used to block the oil thrown out from the main bevel gear 104, which can reduce the impact damage of the lubricating oil thrown out from the main bevel gear 104 to the horizontal oil field of the lubricating oil already established at the arc-shaped plate 702, protect the single lubricating oil field already formed at the oil collecting groove 4, and facilitate the quick opening of the first one-way valve 6. Embodiment

[0050] As shown in the drawings, Figure 1 As shown in the drawings, a drive axle lubrication system, comprising an axle housing 1 and a main reduction module 2 installed on one side of the axle housing 1; wherein the axle housing 1 has an inner cavity 101, the top of the inner cavity 101 is provided with a filling port 102, the filling port 102 is provided with a plug, the bottom of the inner cavity 101 is provided with a drain port 103, the drain port 103 is provided with a plug, the inner cavity 101 is added with lubricating oil through the filling port 102, the lubricating oil is accumulated at the drain port 103 to form an oil pool; a main bevel gear 104 is installed in the inner cavity 101, the bottom of the main bevel gear 104 is immersed in the oil pool;

[0051] The deceleration module comprises a driven bevel gear 201 connected with the main bevel gear 104 in the inner cavity 101, a bearing seat 202, a first bearing 203, a second bearing 204 and an oil seal mechanism 205 for sealing the bearing seat 202; wherein the bearing seat 202 is provided with a first installation cavity 206 and a second installation cavity 207, the first installation cavity 206 is connected with the inner cavity 101, and the first bearing 203 and the second bearing 204 are respectively installed in the first installation cavity 206 and the second installation cavity 207;

[0052] The driven bevel gear 201 further comprises a driven wheel shaft 2011, the first bearing 203 and the second bearing 204 are connected with the driven bevel gear 201 through the driven wheel shaft 2011, and the first bearing 203 is located at one end of the driven wheel shaft 2011 close to the oil pool;

[0053] As shown in Figure 2 , the bearing seat 202 is provided with an oil guide channel 3 for guiding the lubricating liquid from the first installation cavity 206 to the second installation cavity 207, the oil guide channel 3 is tapered and inclined, and specifically:

[0054] As shown in Figure 3 and Figure 4 , the oil guide channel 3 comprises a first channel 301 and a second channel 302 communicated with the first channel 301, the first channel 301 is communicated with the first installation cavity 206, the second channel 302 is communicated with the second installation cavity 207, the aperture of the first channel 301 is smaller than that of the second channel 302, and the communication position of the second channel 302 with the second installation cavity 207 is lower than that of the first channel 301 with the first installation cavity 206; when the main bevel gear 104 and the driven bevel gear 201 operate, the oil pool is agitated, part of the lubricating oil is thrown out, the lubricating oil enters the first installation cavity 206 to lubricate the first bearing 203, and part of the lubricating oil in the first installation cavity 206 enters the second installation cavity 207 through the oil guide channel 3 to lubricate the second bearing 204, since the second bearing 204 is far away from the oil pool, the second bearing 204 far away from the oil pool can also be effectively lubricated in the operation process of the drive axle through the oil guide channel 3;

[0055] As shown in Figure 5As shown, in order to improve the lubrication effect of the second bearing 204, the inner cavity 101 is provided with an oil collecting groove 4 at one side corresponding to the connection between the main bevel gear 104 and the driven bevel gear 201, the oil collecting groove 4 is connected with an external oil pipe 5, the first one-way valve 6 is installed at one end of the external oil pipe 5 close to the oil collecting groove 4, the opening pressure value of the first one-way valve 6 is 0.2 bar, and the other end of the external oil pipe 5 away from the oil collecting groove 4 is connected with the second installation cavity 207. When the main bevel gear 104 and the driven bevel gear 201 operate, the oil pool is agitated, part of the lubricating oil is thrown out, the thrown-out lubricating oil is gathered at the oil collecting groove 4 to form oil pressure and open the first one-way valve 6, the lubricating oil gathered at the oil collecting groove 4 enters the external oil pipe 5 through the first one-way valve 6, and finally flows into the second installation cavity 207 to lubricate the second bearing 204, so that the second bearing 204 away from the oil pool can also be effectively lubricated during the operation of the drive axle;

[0056] As shown in the drawings, Figure 6 In order to improve the oil collecting effect at the oil collecting groove 4, the oil collecting plate 7 is also installed in the oil collecting groove 4, and specifically:

[0057] The oil collecting plate 7 comprises a vertical plate 701 and an arc-shaped plate 702 connected with the vertical plate 701; the vertical plate 701 is opposite to the oil throwing direction of the main bevel gear 104, and the arc-shaped plate 702 is opposite to the oil throwing direction of the driven bevel gear 201. It should be noted that the vertical plate 701 and the arc-shaped plate 702 do not form an obstacle to the connection between the oil collecting groove 4 and the external oil pipe 5. The upper side of the arc-shaped plate 702 is used to receive and quickly accumulate the oil thrown by the driven bevel gear 201. When the gear operates at high speed, a large amount of lubricating oil is thrown into the oil collecting groove 4, which is easy to quickly establish oil pressure and open the first one-way valve 6. The vertical plate 701 is used to shield the oil thrown by the main bevel gear 104, which can reduce the impact damage of the lubricating oil thrown by the main bevel gear 104 to the horizontal oil field of the lubricating oil already established at the arc-shaped plate 702, protect the single lubricating oil field already formed at the oil collecting groove 4, and facilitate the quick opening of the first one-way valve 6.

[0058] As shown in the drawings, Figure 7As shown, due to the vehicle is in the process of uphill, A represents the slope angle, B represents the oil level, the oil level in the axle housing 1 is inclined, and the lubricating oil in the second installation cavity 207 flows back to the inner cavity 101. In order to avoid the situation that the bearing is heated due to lack of lubricating oil during the vehicle uphill, the reduction module further comprises an oil return mechanism, wherein the oil return mechanism comprises an oil return port 2081 opened on one side of the axle housing 1 and connected with the inner cavity 101, a first through hole 2082 opened on the bearing seat 202 and connected with the second installation cavity 207, a second through hole 2083 opened on the bearing seat 202 and connected with the second installation cavity 207, a second one-way valve 2084 installed in the first through hole 2082, a third one-way valve 2085 installed in the second through hole 2083, an electromagnetic reversing valve 2086 connected with the second one-way valve 2084 and the third one-way valve 2085, an oil pump 2087 connected with the electromagnetic reversing valve 2086, an oil return pipe 2088, a temperature sensor 2089 and a controller (not shown), the opening pressure of the second one-way valve 2084 and the third one-way valve 2085 is 0.2 bar, and the specific:

[0059] As shown in Figure 8 and Figure 9 The oil pump 2087 is installed with an oil tank 8, the oil tank 8 is installed with an overflow valve 9, one end of the oil return pipe 2088 is connected with the oil return port 2081, the other end is connected with the oil tank 8 of the oil pump 2087, a check valve 10 is installed at one end of the oil return pipe 2088 close to the oil return port 2081, the opening pressure of the check valve 10 is 0.05 bar, when the axle housing 1 is inclined due to the vehicle uphill, the lubricating oil in the oil pool enters the oil return pipe 2088 through the check valve 10;

[0060] The temperature sensor 2089 is installed in the second installation cavity 207, the temperature sensor 2089, the electromagnetic reversing valve 2086 and the oil pump 2087 are connected with the controller;

[0061] When the vehicle is uphill, the inclined oil level flows into the oil return port 2081 and gathers in the oil tank of the oil pump 2087, at this time, the second bearing 204 cannot be effectively lubricated due to the backflow of oil in the second installation cavity 207, and the temperature in the second installation cavity 207 rises, when the temperature sensor 2089 detects that the temperature meets the preset temperature threshold, in the embodiment, the preset threshold is 80℃ and 100℃, when the temperature in the second installation cavity 207 reaches 80℃, the controller opens the electromagnetic reversing valve 2086 corresponding to the valve of the second one-way valve 2084 and opens the oil pump 2087, the lubricating oil enters the second installation cavity 207 through the second one-way valve 2084 to lubricate the second bearing 204;

[0062] When the temperature in the second installation cavity 207 reaches 100℃, the controller opens the electromagnetic reversing valve 2086 corresponding to the third one-way valve 2085, and the lubricating oil enters the second installation cavity 207 through the second one-way valve 2084 and the third one-way valve 2085 to lubricate the second bearing 204.

[0063] Working principle

[0064] The oil guide channel 3 guides the lubricating oil from the bevel gear 201 to the second installation cavity 207, so that the second bearing 204 can be lubricated, and the oil collecting groove 4 collects the lubricating oil splashed from the bevel gear 201 to the inner cavity 101 wall and increases the oil pressure, the first one-way valve 6 is opened, the lubricating oil collected in the oil collecting groove 4 enters the external oil pipe 5 through the first one-way valve 6, and finally flows into the second installation cavity 207.

[0065] When the vehicle is on an uphill, the inclined oil surface flows into the oil return port 2081 and accumulates in the oil tank 8 of the oil pump 2087, and when the temperature in the second installation cavity 207 reaches 60℃, the controller opens the electromagnetic reversing valve 2086 corresponding to the second one-way valve 2084 and opens the oil pump 2087, and the lubricating oil enters the second installation cavity 207 through the second one-way valve 2084.

[0066] When the temperature in the second installation cavity 207 reaches 80℃, the controller opens the electromagnetic reversing valve 2086 corresponding to the third one-way valve 2085, and the lubricating oil enters the second installation cavity 207 through the second one-way valve 2084 and the third one-way valve 2085.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0068] In the description of the application, it should be noted that unless otherwise expressly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0069] The above is only the preferred embodiment of the present application, it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can also be made, these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A drive axle lubrication system, characterized in that, It includes a bridge housing (1) and a main deceleration module (2) located on one side of the bridge housing (1); The bridge housing (1) is provided with an inner cavity (101), an oil filling port (102) and an oil drain port (103) connected to the inner cavity (101), and lubricating oil is added to the inner cavity (101) to form an oil pool; The inner cavity (101) is provided with a main bevel gear (104), and the main reduction module (2) includes a secondary bevel gear (201), a bearing housing (202), a first bearing (203), a second bearing (204), and an oil seal mechanism (205) for sealing the bearing housing (202) connected to the main bevel gear (104) in the inner cavity (101). The bearing housing (202) is provided with a first mounting cavity (206) for mounting a first bearing (203) and a second mounting cavity (207) for mounting a second bearing (204). The driven bevel gear (201) includes a driven wheel shaft (2011), and the first bearing (203) and the second bearing (204) are connected to the driven bevel gear (201) through the driven wheel shaft (2011). The first bearing (203) is located at one end of the driven wheel shaft (2011) near the oil sump. The bearing housing (202) is provided with an oil guide channel (3) for guiding lubricant from the first mounting cavity (206) to the second mounting cavity (207); The inner cavity (101) is provided with an oil collection groove (4) on the side corresponding to the connection between the main bevel gear (104) and the secondary bevel gear (201). The oil collection groove (4) is connected to an external oil pipe (5). The end of the external oil pipe (5) near the oil collection groove (4) is provided with a first check valve (6). The end of the external oil pipe (5) away from the oil collection groove (4) is connected to the second mounting cavity (207). The main deceleration module (2) also includes an oil return mechanism; The oil return mechanism includes an oil return port (2081) opened on one side of the bridge housing (1) and connected to the inner cavity (101), a first through hole (2082) opened on the bearing seat (202) and connected to the second mounting cavity (207), a second through hole (2083) opened on the bearing seat (202) and connected to the second mounting cavity (207), a second check valve (2084) connected to the first through hole (2082), a third check valve (2085) connected to the second through hole (2083), an electromagnetic reversing valve (2086) connected to the second check valve (2084) and the third check valve (2085), an oil pump (2087) connected to the electromagnetic reversing valve (2086), an oil return pipe (2088), a temperature sensor (2089), and a controller; One end of the return oil pipe (2088) is connected to the return oil port (2081), and the other end is connected to the oil pump (2087); A check valve is provided at one end of the return oil pipe (2088) near the return oil port (2081); The bridge housing (1) is tilted, and the lubricating oil in the oil sump enters the return oil pipe (2088). The temperature sensor (2089) is located in the second mounting cavity (207); The temperature sensor (2089), the solenoid directional valve (2086), and the oil pump (2087) are all connected to the controller.

2. The drive axle lubrication system according to claim 1, characterized in that, The oil guide channel (3) is set at an angle.

3. The drive axle lubrication system according to claim 1, characterized in that, The oil guide channel (3) is conical.

4. The drive axle lubrication system according to claim 1 or 3, characterized in that, The oil guide channel (3) includes a first channel (301) and a second channel (302) connected to the first channel (301). The first channel (301) is connected to the first mounting cavity (206), and the second channel (302) is connected to the second mounting cavity (207). The aperture of the first channel (301) is smaller than the aperture of the second channel (302).

5. The drive axle lubrication system according to claim 1, characterized in that, The opening pressure of the first check valve (6) is 0.2 bar.

6. The drive axle lubrication system according to claim 1, characterized in that, The oil collection tank (4) is provided with an oil collection plate (7) for quickly forming oil pressure in the oil collection tank (4).

7. The drive axle lubrication system according to claim 6, characterized in that, The oil collecting plate (7) includes a vertical plate (701) and an arc plate (702) connected to the vertical plate (701); the vertical plate (701) is in view of the direction of oil throwing from the main bevel gear (104), and the arc plate (702) is in view of the direction of oil throwing from the secondary bevel gear (201).

8. The drive axle lubrication system according to claim 1, characterized in that, The opening pressure of the second check valve (2084) and the third check valve (2085) is 0.2 bar.

9. A grader, characterized in that, Includes the drive axle lubrication system as described in any one of claims 1 to 8.

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