Marine multifunctional gear box

Abstract

The utility model relates to a kind of marine multifunctional gear box, it relates to a gear box.The utility model is to solve the problem that gear box is inconvenient for overhaul, maintenance work due to the accumulation of impurities in oil, oil temperature rises and oil loss after long time operation.The utility model includes box, oil treatment unit, oil cooling unit and oil automatic replenishment unit.Box, oil is circulated between oil treatment unit, oil cooling unit and box when working, to filter and clean the impurities in oil, avoid the problem that lubrication effect is reduced and jamming due to the accumulation of impurities, make gear box use effect better in environment susceptible to pollution;Oil can be cooled when flowing through oil cooling unit, avoid the problem that lubricating oil is overheated due to temperature rise after long time work;Oil automatic replenishment unit can automatically detect the oil level in box, and automatically replenish lubricating oil when oil is insufficient, to avoid the problem of insufficient lubrication after oil loss.The utility model belongs to the technical field of transmission equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to a gear box, in particular to a multifunctional gear box for ships, and belongs to the technical field of transmission equipment. BACKGROUND

[0002] The gear box for ships plays an important role in the power system of the ship, and realizes power transmission and speed change through the interaction between gears, transmits the power of the prime mover to the working machine, and ensures the normal operation of the ship.

[0003] The ship often faces harsh marine environment during navigation, and the gear box bears high torque power transmission. After long-term use, impurities may appear inside due to the wear of gears or other shafting parts. Long-term accumulation of impurities may cause wear and tear of lubricating oil, and long-term work of lubricating oil in high-speed running environment faces obvious temperature rise problem. Part of the lubricating oil is volatilized and lost, which leads to the decrease of lubricating effect and aggravates the friction, which is not conducive to the normal operation of the gear box inside.

[0004] However, due to the limited space in the cabin, the gear box for ships is not as easy to maintain and overhaul as the gear box of other equipment, so it is necessary to improve the gear box for ships to make it run efficiently and stably under various marine conditions.

[0005] In view of the above technical problems, how to propose a multifunctional gear box has become a problem to be solved by the technical personnel in the field at present. SUMMARY

[0006] The present application provides a multifunctional gear box for ships to solve the above problems of the prior art.

[0007] The technical scheme of the present application is: a multifunctional gear box for ships, comprising a box body, an oil treatment unit, an oil cooling unit and an automatic oil supplementing unit.

[0008] The box body, the oil treatment unit and the oil cooling unit are all installed on the fixed base; the oil treatment unit and the oil cooling unit are communicated with the box body in sequence through the pipeline and form a closed oil circuit to realize the filtration and cooling of the oil in the box body.

[0009] The automatic oil supplementing unit comprises an oil storage tank, a piston cylinder, a piston rod, a tension spring, a fixed oil pipe and a third connecting oil pipe.

[0010] The piston cylinder is vertically fixed on the top surface of the oil storage tank and communicates with the oil storage tank, the tension spring is fixed on the oil storage tank, one end of the piston rod is slidably connected with the inner surface of the piston cylinder, and the other end of the piston rod is fixed with the tension spring.

[0011] The fixed oil pipe is vertically arranged with the horizontal plane, is inserted into the tank body, and the oil inlet at the bottom end of the fixed oil pipe is lower than the liquid level of the oil liquid in the tank body.

[0012] The fixed oil pipe is vertically arranged with the horizontal plane, is inserted into the tank body, and the oil inlet at the bottom end of the fixed oil pipe is lower than the liquid level of the oil liquid in the tank body.

[0013] The fixed oil pipe is communicated with the oil storage tank through the second connecting oil pipe, and the oil inlet of the second connecting oil pipe is lower than the liquid level of the oil liquid in the oil storage tank.

[0014] Further, the tank body comprises an output shaft, a driving wheel, a driven wheel and a first cylindrical gear.

[0015] The axis of the output shaft is parallel to the horizontal plane, the driving wheel is coaxially installed on the output shaft, the driven wheel is rotatably connected with the side wall of the tank body, and the first cylindrical gear is coaxially installed on the driven wheel.

[0016] Further, the oil liquid treatment unit comprises a connecting rod, a pump oil piston, a fixed cylinder and a filter cylinder.

[0017] A plurality of filter screens are installed in the filter cylinder, the oil inlet hole of the fixed cylinder and the filter cylinder are communicated with the oil outlet hole of the tank body through pipelines in sequence, and the oil outlet hole of the fixed cylinder is communicated with the top cover of the tank body through the first connecting oil pipe.

[0018] The fixed cylinder is vertically fixed on the fixed base, the pump oil piston is slidably connected with the inner surface of the fixed cylinder, one end of the connecting rod is eccentrically connected with the first cylindrical gear, and the other end of the connecting rod is connected with the pump oil piston.

[0019] The second one-way valve is installed at the oil inlet hole of the fixed cylinder, and the third one-way valve is installed at the oil outlet hole of the fixed cylinder.

[0020] Further, the oil liquid cooling unit comprises a heat dissipation oil tank, a second cylindrical gear, a bevel gear, a support frame and a bevel gear shaft.

[0021] The cooling oil tank is installed on the first connecting oil pipe, and several cooling fins are integrally provided on the cooling oil tank; the second cylindrical gear is rotatably connected to the side wall of the housing, and the second cylindrical gear meshes with the first cylindrical gear, and the bevel gear is coaxially installed on the second cylindrical gear; the support frame is fixed to the side wall of the housing, the bevel gear shaft is rotatably connected to the support frame, one end of the bevel gear shaft meshes with the bevel gear, and the other end of the bevel gear shaft is equipped with a cooling fan.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention features a compact structure, integrating the gearbox housing, oil treatment unit, oil cooling unit, and automatic oil replenishment unit onto a fixed base. Each unit employs a mechanical structure, ensuring reliable operation and maintaining stable gearbox performance in various environments. During operation, the oil circulates between the oil treatment unit, oil cooling unit, and gearbox housing, filtering and cleaning impurities to prevent accumulation that could reduce lubrication effectiveness or cause blockages. This results in better gearbox performance even in contaminated environments. The oil is cooled as it flows through the oil cooling unit, preventing overheating during prolonged operation. The automatic oil replenishment unit automatically detects the oil level and replenishes oil when needed, preventing insufficient lubrication due to oil depletion. Attached Figure Description

[0024] Figure 1 This is the front view of the present invention;

[0025] Figure 2 This is a structural diagram of the oil treatment unit 4 of the present invention;

[0026] Figure 3 This is a structural diagram of the oil cooling unit 5 of the present invention;

[0027] Figure 4 This is a structural diagram of the automatic oil replenishment unit 6 of the present invention;

[0028] Figure 5 This is a schematic diagram showing the connection of the oil reservoir 31, piston cylinder 33, piston rod 35 and tension spring 37 of the present invention;

[0029] Figure 6 yes Figure 4 A magnified view of a section at point I;

[0030] Figure 7 This is a schematic diagram of the automatic oil replenishment unit 6 replenishing oil.

[0031] In the figure: 1, fixed base; 2, box body; 3, output shaft; 4, oil treatment unit; 5, oil cooling unit; 6, oil automatic supplement unit; 7, driving wheel; 8, driven wheel; 10, first cylindrical gear; 11, connecting rod; 13, pump oil piston; 14, fixed cylinder; 16, filter cylinder; 18, filter screen; 19, first connecting oil pipe; 20, heat dissipation oil tank; 22, heat dissipation fin; 23, fixed support; 25, second cylindrical gear; 26, bevel gear; 27, support frame; 28, bevel gear shaft; 30, heat dissipation fan; 31, oil storage tank; 32, second connecting oil pipe; 33, piston cylinder; 35, piston rod; 37, tension spring; 38, fixed oil pipe; 40, third connecting oil pipe; 41, plug column; 42, floating air bag; 43, oil tank cover. DETAILED DESCRIPTION

[0032] In order to make the invention purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0033] Specific embodiment one: combined Figures 1 to 7 In this embodiment, a marine multifunctional gear box includes a box body 2, an oil treatment unit 4, an oil cooling unit 5 and an oil automatic supplement unit 6.

[0034] The box body 2, the oil treatment unit 4 and the oil cooling unit 5 are all installed on the fixed base 1; the oil treatment unit 4 and the oil cooling unit 5 are in communication with the box body 2 in sequence through pipelines and form a closed oil circuit, so that the oil is extracted from the box body 2 and flows through the oil treatment unit 4 and the oil cooling unit 5 in sequence and finally flows back to the box body 2, thereby realizing filtering and cooling of the oil in the box body 2.

[0035] The oil automatic supplement unit 6 includes an oil storage tank 31, a piston cylinder 33, a piston rod 35, a tension spring 37, a fixed oil pipe 38 and a third connecting oil pipe 40.

[0036] The piston cylinder 33 is vertically fixed to the top surface of the oil storage tank 31 and is in communication with the oil storage tank 31, the tension spring 37 is fixed to the oil storage tank 31, one end of the piston rod 35 is in sliding connection with the inner surface of the piston cylinder 33, and the other end of the piston rod 35 is fixed to the tension spring 37; the oil storage tank 31 is installed on the fixed base 1, and the oil tank cover 43 and a first one-way valve are installed on the oil storage tank 31, and the first one-way valve blocks the air in the oil storage tank 31 from being discharged to the outside of the oil storage tank 31.

[0037] When the piston rod 35 is pulled upward manually, the piston cylinder 33 extracts the air in the oil tank 31, and then the air pressure in the oil tank 31 is lowered, the oil tank 31 absorbs the external air, at this time, the tension spring 37 is in a stretched state, under the action of the spring force, the tension spring 37 pulls the piston rod 35, the piston rod 35 delivers the gas in the piston cylinder 33 to the oil tank 31, and then the air pressure in the oil tank 31 is increased, and the first one-way valve blocks the air in the oil tank 31 from being discharged to the outside of the oil tank 31, so that the air pressure in the oil tank 31 is maintained.

[0038] The fixed oil pipe 38 is arranged vertically to the horizontal plane, the fixed oil pipe 38 is inserted on the tank body 2, the oil inlet at the bottom end of the fixed oil pipe 38 is lower than the liquid level of the oil in the tank body 2, the two ends of the third connecting oil pipe 40 are respectively communicated with the top end of the fixed oil pipe 38 and the top cover of the tank body 2, so that the oil in the tank body 2 enters the fixed oil pipe 38, and the oil levels in the two are the same by the principle of communicating vessels.

[0039] The fixed oil pipe 38 is installed with a plug column 41 and a floating air bag 42, and the floating air bag 42 is close to the oil inlet of the fixed oil pipe 38, the floating air bag 42 is coaxially fixed with the plug column 41, and the plug column 41 is slidingly connected with the inner circumferential surface of the fixed oil pipe 38, so that the plug column 41 is lifted or lowered with the oil level in the fixed oil pipe 38 by the floating air bag 42.

[0040] The fixed oil pipe 38 is communicated with the oil tank 31 through the second connecting oil pipe 32, and the oil inlet of the second connecting oil pipe 32 is lower than the liquid level of the oil in the oil tank 31, and the oil outlet of the second connecting oil pipe 32 is fixed on the outer circumferential surface of the fixed oil pipe 38, so that when the oil in the tank body 2 is sufficient, the plug column 41 is floated upward under the action of the buoyancy of the floating air bag 42, the plug column 41 blocks the oil outlet of the second connecting oil pipe 32, so that the oil in the oil tank 31 cannot enter the fixed oil pipe 38.

[0041] When the oil in the tank body 2 is reduced due to volatilization loss, the plug column 41 is lowered in the fixed oil pipe 38 by the floating air bag 42, and then the plug column 41 loses the blocking effect, the oil in the oil tank 31 flows through the second connecting oil pipe 32, the fixed oil pipe 38 and the third connecting oil pipe 40 in turn under the action of the atmospheric pressure, and then is delivered to the tank body 2, thereby realizing the function of automatically supplementing the oil in the tank body 2, and effectively avoiding the problems of oil loss and insufficient lubrication after the tank body 2 works for a long time.

[0042] The friction between the outer circumferential surface of the plug column 41 and the inner circumferential surface of the fixed oil pipe 38 is far less than the gravity of the plug column 41 itself, and the buoyancy of the floating air bag 42 on the oil liquid surface is greater than the gravity of the plug column 41 itself; the pressure of the oil liquid in the second connecting oil pipe 32 on the outer circumferential surface of the plug column 41 is less than the gravity of the plug column 41 itself, so the floating air bag 42 drives the plug column 41 to slide freely in the fixed oil pipe 38.

[0043] In this embodiment, the box body 2 includes an output shaft 3, a driving wheel 7, a driven wheel 8 and a first cylindrical gear 10.

[0044] The axis of the output shaft 3 is parallel to the horizontal plane, the driving wheel 7 is coaxially installed on the output shaft 3, the driven wheel 8 is rotationally connected with the side wall of the box body 2, and the first cylindrical gear 10 is coaxially installed on the driven wheel 8. The driven wheel 8 and the driving wheel 7 transmit power through a belt.

[0045] Specific implementation method two: combined Figure 1 and Figure 2 In this embodiment, the oil liquid treatment unit 4 includes a connecting rod 11, a pump oil piston 13, a fixed cylinder 14 and a filter cylinder 16.

[0046] A plurality of filter screens 18 are installed in the filter cylinder 16, the oil inlet hole of the fixed cylinder 14 and the filter cylinder 16 are sequentially communicated with the oil outlet of the box body 2 through pipelines, so that the oil liquid discharged from the box body 2 can be filtered by the filter screens 18 when flowing through the filter cylinder 16, thereby effectively purifying the lubricating oil liquid, reducing the impurities in the oil liquid in the box body 2, and avoiding the problems of jamming, damage to gears or other parts on the shafting caused by impurity accumulation.

[0047] The oil outlet hole of the fixed cylinder 14 is communicated with the top cover of the box body 2 through a first connecting oil pipe 19. In this way, the filter cylinder 16, the fixed cylinder 14 and the box body 2 form a closed oil circuit.

[0048] The fixed cylinder 14 is vertically fixed on the fixed base 1, the pump oil piston 13 is slidingly connected with the inner surface of the fixed cylinder 14, one end of the connecting rod 11 is eccentrically connected with the first cylindrical gear 10, and the other end of the connecting rod 11 is connected with the pump oil piston 13. In this way, the first cylindrical gear 10, the connecting rod 11 and the pump oil piston 13 form a crank slider mechanism (the first cylindrical gear 10 is a crank in the crank slider mechanism, and the pump oil piston 13 is a slider in the crank slider mechanism), and the rotation of the first cylindrical gear 10 drives the pump oil piston 13 to reciprocate in the fixed cylinder 14.

[0049] The second one-way valve is installed at the oil inlet hole of the fixed cylinder 14, and the third one-way valve is installed at the oil outlet hole of the fixed cylinder 14. In this way, when the oil storage space in the fixed cylinder 14 becomes larger, the oil treatment unit 4 draws oil from the box 2, and the second one-way valve prevents the oil in the fixed cylinder 14 from being squeezed into the filter cylinder 16. When the oil storage space in the fixed cylinder 14 becomes smaller, the oil treatment unit 4 delivers oil to the box 2, and the third one-way valve prevents the oil in the first connecting oil pipe 19 from being sucked back into the fixed cylinder 14. In this way, the oil is circulated and filtered repeatedly, reducing impurities and improving the use effect of the oil.

[0050] Other components and connection relationships are the same as in the first embodiment.

[0051] Specific embodiment three: combined with Figure 1 and Figure 3 In this embodiment, the oil cooling unit 5 includes a heat dissipation oil tank 20, a second cylindrical gear 25, a bevel gear 26, a support frame 27, and a bevel gear shaft 28.

[0052] The heat dissipation oil tank 20 is installed on the first connecting oil pipe 19, and a plurality of heat dissipation fins 22 are integrally provided on the heat dissipation oil tank 20. The second cylindrical gear 25 is rotatably connected to the side wall of the box 2, and the second cylindrical gear 25 is engaged with the first cylindrical gear 10. The bevel gear 26 is coaxially installed on the second cylindrical gear 25. The support frame 27 is fixedly connected to the side wall of the box 2, and the bevel gear shaft 28 is rotatably connected to the support frame 27. One end of the bevel gear shaft 28 is engaged with the bevel gear 26, and the other end of the bevel gear shaft 28 is installed with a heat dissipation fan 30. The airflow generated by the rotation of the heat dissipation fan 30 directly sweeps the heat dissipation oil tank 20. In this way, under the combined action of the heat dissipation oil tank 20, the heat dissipation fins 22, and the heat dissipation fan 30, the heat in the oil is dissipated quickly, thereby achieving the functions of cooling and cooling the oil, and further avoiding the problem of excessively high oil temperature after long-term work.

[0053] Further, the embodiment further includes a fixed support column 23, one end of which is fixedly connected to the heat dissipation oil tank 20, and the other end of which is supported on the fixed base 1.

[0054] Other components and connection relationships are the same as in the first or second embodiment.

[0055] Working principle

[0056] Combined with Figures 1 to 7 The working principle of the present application is explained as follows:

[0057] When the output shaft 3 rotates, the driven wheel 8 and the first cylindrical gear 10 are driven by belt transmission. The first cylindrical gear 10 drives the bevel gear shaft 28 to rotate through gear transmission.

[0058] The first cylindrical gear 10, the connecting rod 11 and the pump oil piston 13 constitute a crank slider mechanism, the rotation of the first cylindrical gear 10 drives the pump oil piston 13 to reciprocate in the fixed cylinder 14, so that the oil in the box 2 is sequentially flowed through the oil treatment unit 4 and the oil cooling unit 5 after being pumped out, and finally flows back to the box 2.

[0059] When the oil flows through the filter cylinder 16, the filter screen 18 can filter the impurities in the lubricating oil, thereby effectively purifying the lubricating oil and reducing the impurities in the oil in the box 2, avoiding the problems of jamming, damage to gears or other parts on the shafting caused by the accumulation of impurities.

[0060] When the oil flows through the heat dissipation oil tank 20, under the joint action of the heat dissipation oil tank 20, the heat dissipation fin 22 and the heat dissipation fan 30, the heat in the oil is accelerated to dissipate, thereby playing a function of cooling the oil, and thereby avoiding the problem of too high oil temperature after long time work.

[0061] When the ship sails, the gear box is regularly maintained, the piston rod 35 is manually pulled up, the piston cylinder 33 extracts the air in the oil storage tank 31, then the air pressure in the oil storage tank 31 is lowered, the oil storage tank 31 sucks the external air, at this time the tension spring 37 is in a stretched state, under the action of the spring force, the tension spring 37 pulls the piston rod 35, the piston rod 35 delivers the gas in the piston cylinder 33 to the oil storage tank 31, thereby the air pressure in the oil storage tank 31 is increased, and the first one-way valve blocks the air in the oil storage tank 31 from being discharged to the outside of the oil storage tank 31, so that the air pressure in the oil storage tank 31 is maintained.

[0062] The fixed oil pipe 38 is arranged vertically to the horizontal plane, the fixed oil pipe 38 is inserted into the box 2, the oil inlet at the bottom end of the fixed oil pipe 38 is lower than the liquid level of the oil in the box 2, and the two ends of the third connecting oil pipe 40 are respectively communicated with the top end of the fixed oil pipe 38 and the top cover of the box 2, so that the oil in the box 2 can enter the fixed oil pipe 38, and the oil levels in the two are the same by the principle of communicating vessels.

[0063] The fixed oil pipe 38 is installed with a plug column 41 and a floating air bag 42, the floating air bag 42 is coaxially fixed with the plug column 41, so that the floating air bag 42 drives the plug column 41 to rise or fall with the change of the oil level in the fixed oil pipe 38.

[0064] The fixed oil pipe 38 is communicated with the oil storage tank 31 through the second connecting oil pipe 32, the oil inlet of the second connecting oil pipe 32 is lower than the liquid level of the oil in the oil storage tank 31, and the oil outlet of the second connecting oil pipe 32 is fixed on the outer circumferential surface of the fixed oil pipe 38.

[0065] As Figure 6As shown, when the oil in the box 2 is sufficient, the plug column 41 is floated up by the buoyancy of the floating air bag 42, the plug column 41 blocks the oil outlet of the second connecting oil pipe 32, so that the oil in the oil storage tank 31 cannot enter the fixed oil pipe 38.

[0066] As shown, when the oil in the box 2 is sufficient, the plug column 41 is floated up by the buoyancy of the floating air bag 42, the plug column 41 blocks the oil outlet of the second connecting oil pipe 32, so that the oil in the oil storage tank 31 cannot enter the fixed oil pipe 38. Figure 7 As shown, when the oil in the box 2 is sufficient, the plug column 41 is floated up by the buoyancy of the floating air bag 42, the plug column 41 blocks the oil outlet of the second connecting oil pipe 32, so that the oil in the oil storage tank 31 cannot enter the fixed oil pipe 38.

[0067] The present application has been disclosed in the preferred embodiments as above, however, not to limit the present application, any person skilled in the art, without departing from the technical solution of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiment, still belongs to the technical solution range of the present application.

Claims

1. A marine multi-functional gearbox, characterized in that: It includes a housing (2), an oil treatment unit (4), an oil cooling unit (5), and an automatic oil replenishment unit (6); The housing (2), oil treatment unit (4) and oil cooling unit (5) are all installed on the fixed base (1); the oil treatment unit (4) and oil cooling unit (5) are connected to the housing (2) in sequence through pipelines and form a closed oil circuit to filter and cool the oil in the housing (2); The housing (2) includes an output shaft (3), a drive wheel (7), a driven wheel (8), and a first cylindrical gear (10). The axis of the output shaft (3) is parallel to the horizontal plane. The driving wheel (7) is coaxially mounted on the output shaft (3). The driven wheel (8) is rotatably connected to the side wall of the housing (2). The first cylindrical gear (10) is coaxially mounted on the driven wheel (8). The driven wheel (8) and the driving wheel (7) transmit power through a belt. The oil treatment unit (4) includes a connecting rod (11), a pump piston (13), a fixed cylinder (14), and a filter cylinder (16). The filter cylinder (16) is equipped with several filter screens (18). The oil inlet of the fixed cylinder (14) and the filter cylinder (16) are connected to the oil outlet of the box (2) through pipelines in sequence. The oil outlet of the fixed cylinder (14) is connected to the top cover of the box (2) through the first connecting oil pipe (19). The fixed cylinder (14) is vertically fixed on the fixed base (1), the oil pump piston (13) is slidably connected to the inner surface of the fixed cylinder (14), one end of the connecting rod (11) is eccentrically hinged to the first cylindrical gear (10), and the other end of the connecting rod (11) is hinged to the oil pump piston (13). A second check valve is installed at the oil inlet of the fixed cylinder (14), and a third check valve is installed at the oil outlet of the fixed cylinder (14). The second check valve prevents the oil in the fixed cylinder (14) from being squeezed into the filter cylinder (16), and the third check valve prevents the oil in the first connecting oil pipe (19) from being sucked back into the fixed cylinder (14). The oil cooling unit (5) includes a heat dissipation oil tank (20), a second cylindrical gear (25), a bevel gear (26), a support frame (27), and a bevel gear shaft (28). A cooling oil tank (20) is installed on the first connecting oil pipe (19), and a number of cooling fins (22) are integrally provided on the cooling oil tank (20); a second cylindrical gear (25) is rotatably connected to the side wall of the housing (2), and the second cylindrical gear (25) meshes with the first cylindrical gear (10); a bevel gear (26) is coaxially installed on the second cylindrical gear (25); a support frame (27) is fixed to the side wall of the housing (2), and a bevel gear shaft (28) is rotatably connected to the support frame (27); one end of the bevel gear shaft (28) meshes with the bevel gear (26), and a cooling fan (30) is installed on the other end of the bevel gear shaft (28); The automatic oil replenishment unit (6) includes an oil storage tank (31), a piston cylinder (33), a piston rod (35), a tension spring (37), a fixed oil pipe (38), and a third connecting oil pipe (40). The piston cylinder (33) is vertically fixed to the top surface of the oil tank (31) and is connected to the oil tank (31). The tension spring (37) is fixed to the oil tank (31). One end of the piston rod (35) is slidably connected to the inner surface of the piston cylinder (33), and the other end of the piston rod (35) is fixed to the tension spring (37). The oil tank (31) is installed on the fixed base (1). The oil tank (31) is equipped with an oil tank cover (43) and a first one-way valve. The first one-way valve prevents the air in the oil tank (31) from being discharged to the outside of the oil tank (31). The fixed oil pipe (38) is arranged perpendicular to the horizontal plane. The fixed oil pipe (38) is inserted into the box (2). The oil inlet at the bottom of the fixed oil pipe (38) is lower than the liquid level of the oil in the box (2). The two ends of the third connecting oil pipe (40) are connected to the top of the fixed oil pipe (38) and the top cover of the box (2) respectively. A plug (41) and a floating airbag (42) are installed inside the fixed oil pipe (38), and the floating airbag (42) is close to the oil inlet of the fixed oil pipe (38). The floating airbag (42) is coaxially fixed to the plug (41), and the plug (41) is slidably connected to the inner circumferential surface of the fixed oil pipe (38). The fixed oil pipe (38) is connected to the oil storage tank (31) through the second connecting oil pipe (32), and the oil inlet of the second connecting oil pipe (32) is lower than the oil level in the oil storage tank (31), and the oil outlet of the second connecting oil pipe (32) is fixed to the outer circumference of the fixed oil pipe (38).

2. The marine multi-functional gearbox according to claim 1, characterized in that: The oil cooling unit (5) also includes a fixed support column (23), one end of which is fixedly connected to the heat dissipation oil tank (20), and the other end of which is supported on the fixed base (1).

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