Water pump compensation system for outboard engine

Abstract

The invention discloses a water pump compensation system for an outboard engine, and relates to the technical field of outboard engines, the water pump compensation system comprises a water feeding pipe, a water pump outer shell part is arranged at the bottom of the water feeding pipe, two water pump inner shells are mounted in the water pump outer shell part, and water pump impellers are arranged in the two water pump inner shells; a water pump shell sealing gasket is arranged at the bottom end of the water pump shell, and a water pump base plate is arranged at the bottom end of the water pump shell sealing gasket. By arranging a series of structures, the risk that the cooling efficiency is reduced or an engine is overheated due to working condition changes is avoided, the reliability of the system is remarkably improved, the water pumping capacity is integrally improved, abrasion of the impeller is reduced, and the service life of the high-pressure cavity water pump impeller and even the whole system is prolonged; the lubrication and durability of transmission parts are ensured, the sealing performance of water pumping is optimized, the overall efficiency is improved, and the maintenance requirement is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of outboard motor technology, in particular to a water pump compensation system for outboard motor. BACKGROUND

[0002] In the field of ship propulsion, outboard motor is a widely used power device, and the performance of its cooling system is directly related to the reliability and life of the engine.

[0003] At present, the water pump cooling system of the outboard motor drives the driving shaft to rotate through the engine, and there is an eccentricity between the water pump impeller and the water pump inner shell. When the water pump impeller rotates, the water storage cavity composed of the water pump inner shell and the water pump impeller has a pressure difference, and can continuously suck in the cooling water flow. Since the water pump impeller is at high speed, the impeller blades are subjected to high impact force of water pressure, and the water in the high pressure cavity is discharged into the rear low pressure cavity, causing insufficient water storage in the high pressure cavity chamber. When discharging, air is punched, and the water output becomes weak, causing the engine to heat up rapidly. If the hardness of the water pump impeller is blindly increased to improve the water pump pressure, the water pump impeller blades will be damaged and broken, and the damaged impeller blade residues and fragments may enter the engine with the cooling water, causing the engine waterway to be blocked. Moreover, the cooling water channel of the engine has complex bends, and if the cooling water pressure is low, it cannot overcome the internal bend resistance of the engine, the cooling water cannot go up, the engine temperature rises, or the cooling waterway is blocked, making cleaning difficult. Moreover, some parts are used only once, and if disassembled, a large number of new parts need to be replaced, and the entire maintenance cycle is lengthened. SUMMARY

[0004] The present application aims to provide a water pump compensation system for outboard motor to solve the problems raised in the background.

[0005] In order to achieve the above object, the present application provides the following technical scheme: an outboard motor water pump compensation system, comprising an upper water pipe, a water pump shell at the bottom of the upper water pipe, two water pump inner shells installed in the water pump shell, a water pump impeller in each water pump inner shell, a water pump shell gasket at the bottom end of the water pump shell, a water pump pad at the bottom end of the water pump shell gasket, a first oil seal shell gasket at the bottom end of the water pump pad, an oil seal shell at the bottom end of the first oil seal shell gasket, a driving shaft installed at the middle position of the water pump impeller near the upper water pipe, a driven shaft installed at the middle position of the other water pump impeller, a half-round key for transmission connection between the driving shaft, the driven shaft and the two water pump impellers, the driving shaft and the driven shaft extending out of the water pump shell at the top, the driving shaft and the driven shaft extending out of the oil seal shell at the bottom, a second oil seal shell gasket at the bottom end of the oil seal shell, a U-shaped compensation pipe installed at the top of the water pump shell between the driving shaft and the driven shaft, a high-pressure cavity water pumping area at the bottom end of the oil seal shell near the driving shaft, and a medium-low pressure water pumping area at the bottom end of the oil seal shell near the driven shaft.

[0006] Preferably, a water pipe sealing ring is connected between the bottom outer surface of the upper water pipe and the top of the water pump shell, two compensation pipe sealing rings are connected between the bottom outer surface of the U-shaped compensation pipe and the top of the water pump shell, the water pipe sealing ring ensures the sealing of the connection between the upper water pipe and the water pump shell, prevents leakage of cooling water before entering the engine, ensures water pressure, and the compensation pipe sealing ring ensures the sealing of the connection between the U-shaped compensation pipe and the water pump shell, so that the cooling water in the medium-low pressure cavity can be effectively delivered to the high-pressure cavity through the compensation pipe, avoiding pressure relief and flow loss.

[0007] Preferably, two O-rings are arranged in the second oil seal shell gasket at the outer surface of the bottom extension of the driving shaft and the driven shaft, two oil seals are arranged at the bottom end of the outer surface of the driving shaft and the driven shaft, and the O-rings and the oil seals constitute a multi-stage sealing system, which mainly prevents the gear oil in the underwater shell cavity from leaking upward along the driving shaft and the driven shaft, prevents external water from flowing into the gear box, ensures reliable lubrication of the transmission system, and completely isolates the transmission system from the water system.

[0008] Preferably, the outer surface of the driving shaft and the driven shaft below the oil seal is provided with an axial limiting ring, the outer surface of the axial limiting ring of the driving shaft is provided with a driving gear, the outer surface of the axial limiting ring of the driven shaft is provided with a driven gear, the driving gear and the driven gear are jointly connected with an intermediate gear, the axial limiting ring is used for accurately positioning the gear in the axial direction, thereby ensuring that the gear meshing position is stable, the transmission is stable, the driving gear, the driven gear and the intermediate gear form a speed reduction transmission system, the power of the driving shaft is transmitted to the intermediate gear through the driving gear, and then the driven gear is driven, so that the driven shaft is rotated, and the design of the gear set determines that the rotating speed of the driven shaft is lower than that of the driving shaft, and the function requirement that the impeller of the medium-low pressure cavity continuously operates at a medium-low speed is realized.

[0009] Preferably, the inner portion of the intermediate gear is provided with a first wear-resistant sheet, and the bottom of the intermediate gear is provided with a tapered roller bearing, the first wear-resistant sheet reduces the wear between the intermediate gear and other contact components, and the service life of the transmission component is improved, and the tapered roller bearing is used for bearing the radial and axial loads transmitted by the intermediate gear, thereby ensuring that the intermediate gear rotates stably, and the axial complete limiting is realized by cooperating with the tooling press fitting.

[0010] Preferably, the outer surface of the bottom extension end of the driving shaft and the bottom end of the driven shaft are provided with first needle bearings, the bottom of the driven shaft and the corresponding first needle bearings are jointly connected with a second wear-resistant sheet, and the outer surface of the top extension end of the driven shaft is provided with a second needle bearing, the first needle bearing and the second needle bearing support the bottom and the top of the driving shaft and the driven shaft respectively, bear the radial load, ensure the coaxiality and stability of the double shaft rotation, reduce the friction, and the second wear-resistant sheet is installed between the bottom of the driven shaft and the bearing, thereby preventing the wear between the shaft end and the bearing seat.

[0011] Preferably, the bottom of the driving shaft is provided with a driving gear, the driving gear inputs the power of the power source to the driving shaft through the spline connection, is the power input end of the whole water pump system, and simultaneously, the driving gear is engaged with the gear shifting mechanism of the outboard motor, so that the propelling function is realized.

[0012] Preferably, the bottom of the U-shaped compensation pipe and the bottom of the upper water pipe are in a communicating state with the water pump shell, compensation water enters the high-pressure water flow collection area in the water pump shell through the U-shaped compensation pipe, the upper water pipe is communicated with the water pump shell, and the cooling water collected finally is pressed to the engine through the path, and the two communication places are the structural basis for ensuring that the cooling water flows along the designed path.

[0013] Compared with the prior art, the present application has the following beneficial effects: The outboard engine water pump compensation system effectively solves the problem of unstable water pressure of a single water pump system at high speed through the coordinated work of the high-pressure water storage cavity and the medium-low-pressure water storage cavity and the pressure compensation mechanism. When the water pressure in the high-pressure water storage cavity decreases due to high-speed operation, the medium-low-pressure water storage cavity can automatically increase the water suction rate of the water pump impeller through the internal compensation pipe to supplement the cooling water to the high-pressure cavity. This dynamic compensation ensures the stability of the total amount and pressure of the cooling water flowing to the engine, avoids the risk of cooling efficiency decline or engine overheating caused by working condition changes, and significantly improves the reliability of the system.

[0014] The outboard engine water pump compensation system realizes dynamic balance and self-adaption of system output and improves the water pumping capacity through the coordinated operation of the double water pump impellers and the unique transmission design. The high-pressure cavity impeller is directly driven by the driving shaft to rotate at high speed to provide the main cooling flow, and the medium-low-pressure cavity impeller is driven by the driven shaft after being decelerated by the gear set to maintain medium-low-speed operation to provide compensation flow. The two water flows eventually converge to keep the overall water pump system stable. If the high-pressure cavity is short of water, the medium-low-pressure cavity increases the water supply rate. When the high-pressure cavity stabilizes, the medium-low-pressure cavity returns to normal operation. This design not only ensures continuous and stable cooling water supply, but also improves the overall water pumping capacity by sharing the load of the double impellers.

[0015] The outboard engine water pump compensation system effectively balances the stress of the high-pressure cavity water pump impeller through the continuous compensation effect of the medium-low-pressure water storage cavity on the high-pressure water storage cavity, prolonging its service life. The compensation water flow of the medium-low-pressure cavity helps to balance the pressure difference on both sides of the high-pressure cavity impeller, making the stress on the impeller blades more uniform. This reduces the stress and deformation of the blades caused by long-term bearing of unilateral high pressure, reduces the wear of the impeller, and prolongs the service life of the high-pressure cavity water pump impeller and the entire system.

[0016] The outboard engine water pump compensation system realizes compact structure and reliable operation while achieving complex functions through integrated transmission and sealing design. The reduction transmission mechanism composed of the driving shaft, the driven shaft and the intermediate gear is compact and efficient. At the same time, the use of multiple levels of sealing elements such as O-rings, oil seals and various sealing gaskets effectively isolates the water flow channel and the gear transmission cavity, preventing gear oil leakage and external water intrusion, ensuring the lubrication and durability of the transmission components, optimizing the sealing of water pumping, improving the overall efficiency and reducing maintenance requirements. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the overall structure of the present application in a split state; Figure 2 is a schematic view of the overall structure of the present application in a split state; Figure 3The overall structure of the application is shown in the view from below. Figure 4 The structure of the oil seal housing part of the application is shown in the view from above. Figure 5 The structure of the oil seal housing part of the application is shown in the view from above. Figure 6 The structure of the water pump base plate of the application is shown in the view from above. Figure 7 The structure of the water pump base plate of the application is shown in the view from above. Figure 8 The structure of the water pump base plate of the application is shown in the view from above.

[0018] In the figure: 1, upper water pipe; 2, water pipe sealing ring; 3, water pump housing part; 4, water pump inner housing; 5, water pump impeller; 6, oil seal housing part; 7, O-ring; 8, oil seal part; 9, driving gear; 10, axial limiting ring; 11, tapered roller bearing; 12, first needle bearing; 13, driving shaft; 14, driving gear; 15, second needle bearing; 16, U-shaped compensating pipe; 17, compensating pipe sealing ring; 18, water pump housing sealing gasket; 19, water pump base plate; 20, first oil seal housing sealing gasket; 21, second oil seal housing sealing gasket; 22, driven gear; 23, intermediate gear; 24, first wear plate; 25, driven shaft; 26, second wear plate; 27, high-pressure cavity water pumping area; 28, medium-low pressure water pumping area; 29, semicircular key. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0020] In the description of the application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the 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, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] As Figures 1 to 8As shown, the outboard engine water pump compensation system of the embodiment comprises a water inlet pipe 1, which is the final channel for delivering cooling water to the engine. The bottom of the water inlet pipe 1 is provided with a water pump housing 3, which is the main pressure-bearing and water collecting shell of the water pump system, and the water flow of two water pump cavities is collected and guided to the engine. The inside of the water pump housing 3 is provided with two water pump inner shells 4, which form airtight pump cavities in cooperation with water pump impellers 5. The eccentric design of the water pump inner shells 4 is the key to generating water suction pressure difference. The inside of each water pump inner shell 4 is provided with a water pump impeller 5, which is the core working component and generates suction and pressure through rotation to realize water pumping and pumping. The bottom end of the water pump housing is provided with a water pump housing sealing gasket 18, the bottom end of the water pump housing sealing gasket 18 is provided with a water pump gasket plate 19, and the bottom end of the water pump gasket plate 19 is provided with a first oil seal housing sealing gasket 20. These stacked sealing and spacing components work together to separate the high-pressure water flow channel and the lower gear transmission cavity, and the holes designed thereon constitute a specific drainage path for cooling water flowing from the pump cavity to the water pump housing 3. The bottom end of the first oil seal housing sealing gasket 20 is provided with an oil seal housing 6, which forms two independent high-pressure and medium-low-pressure water storage cavities inside and integrates a water suction port and an internal drainage channel. A driving shaft 13 is installed at the middle position of the water pump impeller 5 near the water inlet pipe 1, and a driven shaft 25 is installed at the middle position of the other water pump impeller 5. The driving shaft 13 and the driven shaft 25 are respectively connected to the two water pump impellers 5 through half-round keys 29. The top of the driving shaft 13 and the driven shaft 25 extends out of the water pump housing 3, and the bottom of the driving shaft 13 and the driven shaft 25 extends out of the oil seal housing 6. The design of the driving shaft 13 and the driven shaft 25 is the core to realize independent and linkage transmission of the double cavities. The driving shaft 13 directly transmits power to drive the high-pressure cavity impeller, and the driven shaft 25 drives the medium-low-pressure cavity impeller after speed reduction through a gear set to realize compensation function. The bottom end of the oil seal housing 6 is provided with a second oil seal housing sealing gasket 21, which is used to seal the bottom of the oil seal housing 6 to prevent gear oil leakage and enclose the transmission components in the cavity. A U-shaped compensation pipe 16 is installed at the top of the water pump housing 3 between the driving shaft 13 and the driven shaft 25. The U-shaped compensation pipe 16 is used as a special channel to direct the cooling water pumped out of the medium-low-pressure cavity to the high-pressure cavity to supplement water when the demand of the high-pressure cavity increases. The oil seal housing 6 is provided with a high-pressure cavity water pumping area 27 near the driving shaft 13 at the bottom end, and a medium-low-pressure water pumping area 28 near the driven shaft 25 at the bottom end. The high-pressure cavity water pumping area 27 and the medium-low-pressure water pumping area 28 are water suction ports on the oil seal housing 6, corresponding to the high-pressure water storage cavity and the medium-low-pressure water storage cavity respectively, and directly sucking water from the external water source.

[0022] Specifically, a water pipe sealing ring 2 is connected between the bottom outer surface of the water inlet pipe 1 and the top of the water pump housing 3. Two compensating pipe sealing rings 17 are connected between the bottom outer surface of the U-shaped compensating pipe 16 and the top of the water pump housing 3. The water pipe sealing ring 2 ensures the seal at the connection between the water inlet pipe 1 and the water pump housing 3, preventing leakage of cooling water in the final stage before entering the engine and ensuring water pressure. The compensating pipe sealing rings 17 ensure the seal at the connection between the U-shaped compensating pipe 16 and the water pump housing 3, so that the cooling water in the medium and low pressure chamber can be effectively transported to the high pressure chamber through the compensating pipe, avoiding pressure loss and flow loss.

[0023] Furthermore, two O-rings 7 are provided inside the second oil seal housing gasket 21 on the outer surface of the bottom extension end of the drive shaft 13 and the driven shaft 25. Two oil seals 8 are provided on the outer surface of the drive shaft 13 and the driven shaft 25 at the bottom end of the two O-rings 7. The O-rings 7 and the oil seals 8 constitute a multi-stage sealing system. Its main function is to prevent gear oil in the underwater housing cavity from leaking upward along the drive shaft 13 and the driven shaft 25, while preventing external water from flowing back into the gearbox, ensuring reliable lubrication of the transmission system, and completely isolating it from the water system.

[0024] Furthermore, axial limiting rings 10 are installed on the outer surfaces of the drive shaft 13 and driven shaft 25 below the oil seal 8. A drive gear 9 is installed on the outer surface of the axial limiting ring 10 of the drive shaft 13, and a driven gear 22 is provided on the outer surface of the axial limiting ring 10 of the driven shaft 25. An intermediate gear 23 is connected to the drive gear 9 and the driven gear 22 through meshing. The axial limiting ring 10 is used to accurately position the gears axially, ensuring stable gear meshing position and smooth transmission. The drive gear 9, driven gear 22 and intermediate gear 23 constitute a reduction transmission system. The power of the drive shaft 13 is transmitted to the intermediate gear 23 through the drive gear 9, which then drives the driven gear 22, thereby driving the driven shaft 25 to rotate. The design of this gear set determines that the speed of the driven shaft 25 is lower than that of the drive shaft 13, realizing the functional requirement of the impeller in the medium and low pressure chamber continuously maintaining medium and low speed operation.

[0025] Furthermore, the intermediate gear 23 is provided with a first anti-wear plate 24 inside, and a tapered roller bearing 11 is provided at the bottom of the intermediate gear 23. The first anti-wear plate 24 reduces the wear between the intermediate gear 23 and other contacting parts, and improves the service life of the transmission parts. The tapered roller bearing 11 is used to bear the radial and axial loads transmitted by the intermediate gear 23, ensuring its smooth rotation, and cooperates with the tooling press to achieve complete axial limit.

[0026] Further, the outer surface of the bottom extension end of the driving shaft 13 and the bottom end of the driven shaft 25 are provided with a first needle bearing 12, the bottom of the driven shaft 25 and the corresponding first needle bearing 12 are jointly connected with a second wear-resistant sheet 26, the outer surface of the top extension end of the driven shaft 25 is provided with a second needle bearing 15, the first needle bearing 12 and the second needle bearing 15 respectively support the bottom and top of the driving shaft 13 and the driven shaft 25, bear radial load, ensure the coaxiality and stability of the double shaft rotation, reduce friction, the second wear-resistant sheet 26 is installed between the bottom of the driven shaft 25 and the bearing, preventing wear between the shaft end and the bearing seat.

[0027] Further, the bottom of the driving shaft 13 is provided with a driving gear 14, which inputs power from the power source to the driving shaft 13 through spline connection, and is the power input end of the entire water pump system, at the same time, the driving gear 14 is also engaged with the gear shifting mechanism of the outboard motor to realize the propulsion function.

[0028] Further, the bottom of the U-shaped compensating pipe 16 and the bottom of the upper water pipe 1 are in communication with the water pump shell 3, and the compensating water enters the high-pressure water flow collection area in the water pump shell 3 through the U-shaped compensating pipe 16, and the upper water pipe 1 is in communication with the water pump shell 3, indicating that the collected cooling water is finally sent to the engine through this path, and the communication of the two places is the structural basis for ensuring that the cooling water flows along the designed path.

[0029] The use method of the embodiment is: the system is mainly composed of a cooling water passage, a double-pump cavity structure, a transmission compensation mechanism and a sealing system, the cooling water passage starts from two independent water suction ports at the bottom of the oil seal shell 6: a high-pressure cavity water suction area 27 and a medium-low pressure water suction area 28, and the water flow is finally delivered to the engine through the upper water pipe 1, the double-pump cavity structure is the core of the system, the system includes two pump cavities composed of the water pump inner shell 4 and the water pump impeller 5, which are respectively located in the high-pressure water storage cavity and the medium-low pressure water storage cavity inside the oil seal shell 6, the key of the transmission compensation mechanism lies in the double-shaft design of the driving shaft 13 and the driven shaft 25, the driving shaft 13 is powered by the driving gear 14 at the bottom, directly drives the high-pressure cavity impeller to rotate at high speed, and provides main cooling flow, at the same time, the driving shaft 13 drives the driven shaft 25 to rotate at a lower speed through the reduction gear set composed of the driving gear 9, the intermediate gear 23 and the driven gear 22 on the driving shaft 13, so as to drive the medium-low pressure cavity impeller to continuously operate at a medium-low speed, the water pumped out of the medium-low pressure cavity is not directly involved in cooling, but is guided into the water outlet area of the high-pressure cavity as make-up water through the U-shaped compensation pipe 16 connected between the two cavities, and its working principle is dynamic self-adaptation: when the engine load increases and the water pressure of the high-pressure cavity has a downward trend, the pressure difference between the two cavities will reduce the water pumping resistance of the medium-low pressure cavity, automatically increase the water pumping rate, and supplement more cooling water to the high-pressure cavity through the U-shaped compensation pipe 16; when the pressure of the high-pressure cavity is stable, the compensation flow rate is maintained at a basic level, this design realizes on-demand water supply for the high-pressure cavity, effectively avoids water shortage, and after the two water flows converge in the water pump shell 3, the stable and sufficient cooling water is pressed to the engine through the upper water pipe 1 through a specific water drainage hole in the water pump gasket 19, the water pipe sealing ring 2 and the compensation pipe sealing ring 17 ensure the leakproofness of the key connection, and the multiple stacked water pump shell sealing gaskets 18, the water pump gasket 19, the first oil seal shell sealing gasket 20 and the second oil seal shell sealing gasket 21 jointly act to effectively isolate the upper high-pressure water flow area and the transmission cavity containing gears below, the sealing of the transmission cavity is guaranteed by the multi-stage sealing system composed of the O-ring 7 and the oil seal 8, to prevent gear oil leakage and external water backflow, the driving shaft 13 and the driven shaft 25 are supported by the first needle bearing 12, the second needle bearing 15 and the tapered roller bearing 11 to ensure stable rotation, and the axial limiting ring 10, the first anti-wear sheet 24 and the second anti-wear sheet 26 are used for accurate axial positioning and wear reduction.

[0030] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An outboard engine water pump compensation system comprising a water intake pipe (1), characterized in that: The bottom of the upper water pipe (1) is provided with a water pump shell (3), the inside of the water pump shell (3) is provided with two water pump inner shells (4), the inside of the two water pump inner shells (4) is provided with water pump impellers (5), the bottom end of the water pump shell (3) is provided with a water pump shell sealing gasket (18), the bottom end of the water pump shell sealing gasket (18) is provided with a water pump pad (19), the bottom end of the water pump pad (19) is provided with a first oil seal shell sealing gasket (20), the bottom end of the first oil seal shell sealing gasket (20) is provided with an oil seal shell (6), the middle position of the water pump impeller (5) near the upper water pipe (1) is provided with a driving shaft (13), the middle position of the other water pump impeller (5) is provided with a driven shaft (25), the driving shaft (13) and the driven shaft (25) and the two water pump impellers (5) are respectively connected through a semicircular key (29), the top of the driving shaft (13) and the driven shaft (25) extends out of the water pump shell (3), the bottom of the driving shaft (13) and the driven shaft (25) extends out of the oil seal shell (6), the bottom end of the oil seal shell (6) is provided with a second oil seal shell sealing gasket (21), the top of the water pump shell (3) between the driving shaft (13) and the driven shaft (25) is provided with a U-shaped compensation pipe (16), the bottom end of the oil seal shell (6) near the driving shaft (13) is provided with a high-pressure cavity water pumping area (27), the bottom end of the oil seal shell (6) near the driven shaft (25) is provided with a medium-low pressure water pumping area (28).

2. The outboard engine water pump compensation system according to claim 1, characterized by: The bottom outer surface of the upper water pipe (1) and the top of the water pump shell (3) are connected with a water pipe sealing ring (2), and the bottom outer surface of the U-shaped compensation pipe (16) and the top of the water pump shell (3) are connected with two compensation pipe sealing rings (17).

3. The outboard engine water pump compensation system of claim 1, wherein: The inside of the second oil seal shell sealing gasket (21) of the outer surface of the bottom extension of the driving shaft (13) and the driven shaft (25) is provided with two O-rings (7), and the outer surface of the bottom end of the driving shaft (13) and the driven shaft (25) is provided with two oil seals (8).

4. The outboard engine water pump compensation system according to claim 3, characterized by: The outer surface of the driving shaft (13) and the driven shaft (25) below the oil seal (8) is provided with an axial limiting ring (10), the outer surface of the axial limiting ring (10) of the driving shaft (13) is provided with a driving gear (9), the outer surface of the axial limiting ring (10) of the driven shaft (25) is provided with a driven gear (22), and the driving gear (9) and the driven gear (22) are jointly meshed with an intermediate gear (23).

5. The outboard engine water pump compensation system according to claim 4, characterized by: The inside of the intermediate gear (23) is provided with a first wear-resistant sheet (24), and the bottom of the intermediate gear (23) is provided with a tapered roller bearing (11).

6. The outboard engine water pump compensation system of claim 1, wherein: The outer surface of the bottom extension end of the driving shaft (13) and the bottom end of the driven shaft (25) are provided with first needle bearings (12), the bottom of the driven shaft (25) and the corresponding first needle bearings (12) are jointly connected with second wear-resistant sheets (26), and the outer surface of the top extension end of the driven shaft (25) is provided with a second needle bearing (15).

7. The outboard engine water pump compensation system of claim 1, wherein: The bottom of the driving shaft (13) is provided with a driving gear (14).

8. The outboard engine water pump compensation system of claim 1, wherein: The bottom of the U-shaped compensation pipe (16) and the bottom of the upper water pipe (1) are in a communicating state with the water pump shell (3).

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