A marine outboard propeller and sealing structure thereof

Abstract

The present invention relates to the technical field of ship propulsion devices, and specifically to a marine outboard motor propeller and a sealing structure thereof. A sealing structure is arranged in a shell on the marine outboard motor propeller, and an underwater propeller shaft is rotatably arranged in the shell. It comprises a sealing mechanism, and the sealing mechanism comprises an oil seal ring and a disc spring, and a first annular groove, a second annular groove and a plurality of micro-through holes are provided on the oil seal ring. The first annular groove and the underwater propeller shaft form an oil seal cavity, and the second annular groove, the underwater propeller shaft and the disc spring form a buffer cavity with a variable space size. The buffer cavity with a variable space size and the deformable disc spring can balance the pressure, so that the pressure in the oil seal cavity is always positive pressure, and prevent external water from entering the oil seal cavity. The sealing oil in the oil seal cavity enters the buffer cavity after expansion, and prevents the sealing oil in the oil seal cavity from overflowing outward, causing waste of the sealing oil. The present invention provides a marine outboard motor propeller and a sealing structure thereof, so as to solve the problem that the sealing oil in the existing propeller is easy to leak.

Description

Technical Field

[0001] The invention relates to the technical field of ship propulsion devices, and in particular to a ship outboard motor propeller and a sealing structure thereof. Background Art

[0002] A propeller is a device that converts any form of energy into mechanical energy. It generates thrust by rotating blades or jets (water), which can be used to drive vehicles forward or as a power source for other devices such as generators. Marine outboard propellers are usually suspended on the outside of the hull (side) and can be directly extended into the water. The propeller is driven by an internal combustion engine, electric motor or other form of power device to rotate, thereby propelling the boat forward. Marine outboard motors can be divided into two categories according to the energy source: fuel-powered and electric-powered. Fuel-powered outboard motors include gasoline outboard motors and diesel outboard motors. Electric-powered outboard motors use batteries as power sources. According to the position of the motor, they can be divided into two types: motor-down and motor-up. Electric outboard motors with motor-down are mostly used for electric outboard motors with lower horsepower, while motor-up are suitable for electric outboard motors with higher horsepower. The working principle of fuel-powered outboard motors is to convert the chemical energy of fuel into mechanical energy through an internal combustion engine, and then convert it into kinetic energy for the boat to move forward through mechanical transmission and propellers. The working principle of an electric outboard motor is to convert electrical energy into kinetic energy through an electric motor, which in turn drives the propeller to rotate and propel the boat forward.

[0003] For example, the patent with announcement number CN213594508U provides a sealing system and ship for high-power ice-area rudder propellers. By setting a stern shaft sealing structure on the propeller shaft of the rudder propeller, when oil leakage occurs, since there is an air cavity between each oil cavity and the seawater side, compressed air can transport the leaked oil to the oil collection tank. However, the existing large outboard propeller seals use oil seals in dynamic seals. Small outboard propellers cannot be set up with sealing oil circulation due to their small size, resulting in the pressure of the sealing oil cannot be freely controlled, making the sealing oil pressure greater than the external pressure, thereby causing sealing oil leakage or seawater entering the sealing oil, and the oil seal loses out due to the increase in temperature and pressure when in use. Summary of the invention

[0004] The invention provides a marine outboard motor propeller and a sealing structure thereof, so as to solve the problem that sealing oil in the existing propeller is easy to leak.

[0005] The present invention discloses a marine outboard propeller and a sealing structure thereof, which adopts the following technical scheme: a sealing structure is arranged in a housing on the marine outboard propeller, and an underwater propeller shaft is rotatably arranged in the housing, and the underwater propeller shaft is arranged horizontally, and the two ends of the underwater propeller shaft are respectively a first end and a second end. A sealing structure includes a sealing mechanism, and the sealing mechanism includes an oil seal ring, a disc spring and a bearing. The oil seal ring, the disc spring and the bearing are all arranged on the underwater propeller shaft, and the oil seal ring, the disc spring, the bearing and the underwater propeller shaft are arranged concentrically, and the oil seal ring, the disc spring and the bearing are distributed in sequence along the direction from the second end to the first end of the underwater propeller shaft.

[0006] The oil seal ring is provided with a first annular groove, a second annular groove and a plurality of micro-through holes, and the first annular groove, the second annular groove and the oil seal ring are coaxially arranged. The first annular groove and the second annular groove are sequentially distributed along the direction from the second end to the first end of the underwater paddle shaft. The first annular groove and the underwater paddle shaft form an oil seal cavity, and the micro-through holes are connected to the first annular groove and the second annular groove. One side of the disc spring is against the bearing, and the other side of the disc spring is slidably arranged in the second annular groove. The second annular groove, the underwater paddle shaft and the disc spring form a buffer cavity with a variable space size, and the oil seal cavity and the buffer cavity are used to store sealing oil.

[0007] Furthermore, a first placement groove is provided on the oil seal ring, the first placement groove is annular, and the first placement groove and the oil seal ring are arranged concentrically. The first placement groove is located on the side of the first annular groove away from the second annular groove. The sealing mechanism also includes a first sealing ring, the first sealing ring is arranged in the first placement groove, and the first sealing ring and the underwater paddle shaft are against each other.

[0008] Furthermore, the oil seal ring is provided with a second placement groove, which is annular, and the first ring groove and the second ring groove are located in the inner ring of the second placement groove, and the first ring groove, the second ring groove and the second placement groove are coaxially arranged. The sealing mechanism also includes two elastic rings, which are coaxially arranged with the underwater propeller shaft, and the elastic rings are arranged in the second placement groove and abut against the groove wall of the second placement groove. The two elastic rings correspond to the first ring groove and the second ring groove respectively.

[0009] Furthermore, a retaining ring is fixedly arranged on the housing, the retaining ring and the underwater propeller shaft are arranged coaxially, and the retaining ring is located between the oil seal ring and the bearing. One side of the bearing abuts against the underwater propeller shaft, and the other side of the bearing abuts against one side of the retaining ring. The other side of the retaining ring abuts against the oil seal ring.

[0010] Furthermore, a third annular groove is provided on the oil seal ring, the third annular groove is located between the first annular groove and the second annular groove, the third annular groove and the underwater propeller shaft are arranged concentrically, and the third annular groove communicates with the first annular groove and the second annular groove. The groove wall of the third annular groove abuts against the underwater propeller shaft, the micro-through hole is located on the groove wall of the third annular groove, and the plurality of micro-through holes are sequentially distributed along the circumference of the underwater propeller shaft.

[0011] The sealing mechanism also includes an annular block, which is coaxially arranged with the underwater paddle shaft, and the outer wall of the annular block is fixedly connected to the second annular groove. The annular block and the disc spring are distributed in sequence along the direction from the second end to the first end of the underwater paddle shaft, and along the axial direction of the underwater paddle shaft, the side of the annular block close to the bearing abuts against the disc spring. An inclined surface is provided on the inner circumferential wall of the annular block, and along the direction from the second end to the first end of the underwater paddle shaft, the inclined surface of the annular block gradually moves away from the underwater paddle shaft. There is a gap between the inclined surface of the annular block and the underwater paddle shaft, and the gap is connected to the micro-through hole. Along the axial direction of the underwater paddle shaft, the side of the annular block close to the bearing abuts against the disc spring.

[0012] Furthermore, the inner side of the disc spring abuts against the underwater paddle shaft, and the outer side of the disc spring abuts against the groove wall of the second annular groove. The disc spring includes a plurality of circular ring assemblies, and the plurality of circular ring assemblies are sequentially distributed along the axial direction of the underwater paddle shaft, and each circular ring assembly includes a first elastic ring and a second elastic ring, and the first elastic ring, the second elastic ring and the underwater paddle shaft are concentrically arranged. The first elastic ring and the second elastic ring are arranged obliquely, and along the direction from the second end of the underwater paddle shaft to the first end, the first elastic ring gradually moves away from the underwater paddle shaft, and the second elastic ring gradually approaches the underwater paddle shaft. The outer side of the first elastic ring in each circular ring assembly is fixedly connected to the outer side of the second elastic ring. A first angle is formed between the first elastic ring and the second elastic ring, and the first angle opens toward the underwater paddle shaft.

[0013] In two adjacent circular ring assemblies, the inner side of the first elastic ring in one circular ring assembly is fixedly connected to the inner side of the second elastic ring in the other circular ring assembly, and a second angle is formed between the first elastic ring in one circular ring assembly and the second elastic ring in the other circular ring assembly, and the second angle opens toward the housing. The first elastic ring in the circular ring assembly close to the second end of the underwater propeller shaft is used to abut against the annular block.

[0014] Furthermore, the sealing mechanism also includes an end cover, which is arranged on the underwater propeller shaft and is coaxially arranged with the underwater propeller shaft. The end cover is located on the side of the oil seal ring away from the bearing. The end cover is fixedly connected to the housing by a fixing screw.

[0015] Furthermore, a J-shaped leather cup is arranged on the end cover, the J-shaped leather cup and the underwater paddle shaft are arranged coaxially, and the inner wall of the J-shaped leather cup and the underwater paddle shaft are against each other.

[0016] Furthermore, a marine outboard propeller comprises the above sealing structure and a propeller, wherein the first end of the underwater propeller shaft is rotatably disposed in the housing, and the propeller is fixedly disposed at the second end of the underwater propeller shaft. An exhaust port is provided on the housing.

[0017] Furthermore, a marine outboard motor propeller also includes a driving mechanism, which includes a motor, the motor is fixedly disposed in the housing, a first bevel gear is fixedly disposed on the output shaft of the motor, a second bevel gear is fixedly disposed on the first end of the underwater propeller shaft, and the first bevel gear and the second bevel gear are meshed.

[0018] The beneficial effects of the present invention are as follows: a marine outboard motor propeller and a sealing structure thereof of the present invention, through the provided sealing mechanism, in the initial state when not working, there is sealing oil in the oil seal cavity, the disc spring compresses the air in the buffer cavity, and presses the air in the buffer cavity into the oil seal cavity, thereby making the pressure in the oil seal cavity greater than the external pressure, and the pressure in the oil seal cavity forms a positive pressure, preventing external water from entering the oil seal cavity.

[0019] During operation, the underwater propeller shaft rotates. When the underwater propeller shaft rotates, heat is generated, and the sealing oil in the oil seal cavity expands due to the heat. Then, the sealing oil in the oil seal cavity flows into the buffer cavity through the micro-through hole. The sealing oil enters the buffer cavity, which further increases the pressure in the buffer cavity, thereby pushing the disc spring, and the disc spring is shortened as a whole. The buffer cavity with variable space size and the deformable disc spring can balance the pressure, so that the sealing oil in the oil seal cavity enters the buffer cavity after expansion, preventing the sealing oil in the oil seal cavity from overflowing outward, causing waste of sealing oil.

[0020] When the speed of the underwater propeller shaft increases, the stern will lower and the bow will rise. At this time, the outer shell is more submerged in the water, the underwater propeller shaft enters deeper into the water, and the external pressure of the underwater propeller shaft is greater. Due to the increase in the speed of the underwater propeller shaft, more heat is generated when the underwater propeller shaft rotates, the sealing oil in the oil seal cavity expands more, the pressure on the buffer cavity is greater, and the disc spring is compressed more, thereby increasing the overall pressure of the oil seal cavity and the buffer cavity, thereby adapting to the pressure of different water depths and ensuring that the pressure inside the oil seal cavity is always greater than the external pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic structural diagram of a marine outboard propeller provided by an embodiment of the present invention;

[0023] Figure 2 A front view of a marine outboard propeller provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0025] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0026] Figure 5 for Figure 4 The enlarged view of point D in the middle;

[0027] Figure 6 An exploded diagram of a marine outboard propeller provided by an embodiment of the present invention;

[0028] Figure 7 A schematic structural diagram of an oil seal ring of a sealing structure provided by an embodiment of the present invention;

[0029] Figure 8 for Figure 7 Cross-sectional view at CC.

[0030] In the figure: 100, outer casing; 101, exhaust port; 105, propeller; 110, underwater propeller shaft; 111, end cover; 1111, J-shaped leather cup; 112, fixing screw; 113, oil seal ring; 1131, first seal ring; 1132, elastic ring; 1133, oil seal chamber; 1134, buffer chamber; 1135, first placement groove; 1136, second placement groove; 1137, micro-through hole; 114, disc spring; 1141, first elastic ring; 1142, second elastic ring; 115, bearing; 116, retaining ring; 117, third ring groove; 120, annular block. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figures 1 to 8 As shown, a sealing structure provided by an embodiment of the present invention is arranged in a housing 100 on a marine outboard propeller, and an underwater propeller shaft 110 is rotatably arranged in the housing 100. The underwater propeller shaft 110 is arranged horizontally, and the two ends of the underwater propeller shaft 110 are respectively a first end and a second end. A sealing structure includes a sealing mechanism, and the sealing mechanism includes an oil seal ring 113, a disc spring 114 and a bearing 115. The oil seal ring 113, the disc spring 114 and the bearing 115 are all arranged on the underwater propeller shaft 110, and the oil seal ring 113, the disc spring 114, the bearing 115 and the underwater propeller shaft 110 are arranged concentrically, and the oil seal ring 113, the disc spring 114 and the bearing 115 are distributed in sequence along the direction from the second end to the first end of the underwater propeller shaft 110.

[0033] The oil seal ring 113 is provided with a first annular groove, a second annular groove and a plurality of micro-through holes 1137, and the first annular groove, the second annular groove and the oil seal ring 113 are coaxially arranged. The first annular groove and the second annular groove are sequentially distributed along the direction from the second end to the first end of the underwater paddle shaft 110. The first annular groove and the underwater paddle shaft 110 form an oil seal cavity 1133, and the micro-through holes 1137 are connected to the first annular groove and the second annular groove, and the side of the second annular groove away from the first annular groove passes through the oil seal ring 113. One side of the disc spring 114 is against the bearing 115, and the other side of the disc spring 114 is slidably arranged in the second annular groove. The second annular groove, the underwater paddle shaft 110 and the disc spring 114 form a buffer cavity 1134 with a variable space size, and the oil seal cavity 1133 and the buffer cavity 1134 are used to store sealing oil.

[0034] In the initial state when not working, there is sealing oil in the oil seal chamber 1133, and the disc spring 114 compresses the air in the buffer chamber 1134, and presses the air in the buffer chamber 1134 into the oil seal chamber 1133, so that the pressure in the oil seal chamber 1133 is greater than the external pressure. The pressure in the oil seal chamber 1133 forms a positive pressure, which prevents external water from entering the oil seal chamber 1133.

[0035] During operation, the underwater paddle shaft 110 rotates. When the underwater paddle shaft 110 rotates, heat is generated, and the sealing oil in the oil seal cavity 1133 expands due to the heat, and then the sealing oil in the oil seal cavity 1133 flows into the buffer cavity 1134 through the micro-through hole 1137. The sealing oil enters the buffer cavity 1134, which further increases the pressure in the buffer cavity 1134, thereby pushing the disc spring 114, and the disc spring 114 is shortened as a whole. The buffer cavity 1134 with a variable space size and the deformable disc spring 114 can balance the pressure, so that the sealing oil in the oil seal cavity 1133 enters the buffer cavity 1134 after expansion, thereby preventing the sealing oil in the oil seal cavity 1133 from overflowing outwards and causing waste of sealing oil.

[0036] When the speed of the underwater propeller shaft 110 is higher, the stern will be lowered and the bow will be lifted upward. At this time, the outer shell 100 is more submerged in the water, the underwater propeller shaft 110 enters deeper into the water, and the external pressure of the underwater propeller shaft 110 is greater. Due to the increase in the speed of the underwater propeller shaft 110, the underwater propeller shaft 110 generates more heat when rotating, the sealing oil in the oil seal cavity 1133 expands more, the pressure on the buffer cavity 1134 is greater, and the disc spring 114 is compressed more, thereby increasing the overall pressure of the oil seal cavity 1133 and the buffer cavity 1134, thereby adapting to the pressure of different water depths, and ensuring that the internal pressure of the oil seal cavity 1133 is always greater than the external pressure.

[0037] In this embodiment, the oil seal ring 113 is further provided with a first placement groove 1135, which is annular, and the first placement groove 1135 and the oil seal ring 113 are arranged concentrically. The first placement groove 1135 is located on the side of the first annular groove away from the second annular groove. The sealing mechanism also includes a first sealing ring 1131, which is arranged in the first placement groove 1135, and the first sealing ring 1131 and the underwater paddle shaft 110 are against each other. The first sealing ring 1131 is used to block the gap at the contact point between the first sealing ring 1131 and the underwater paddle shaft 110.

[0038] In this embodiment, the oil seal ring 113 is also provided with a second placement groove 1136, which is annular, and the first ring groove and the second ring groove are located in the inner ring of the second placement groove 1136, and the first ring groove, the second ring groove and the second placement groove 1136 are coaxially arranged. The second placement groove 1136 passes through the oil seal ring 113 on the side close to the bearing 115. The sealing mechanism also includes two elastic rings 1132, which are concentrically arranged with the underwater paddle shaft 110, and the elastic ring 1132 is arranged in the second placement groove 1136 and abuts against the groove wall of the second placement groove 1136. The two elastic rings 1132 correspond to the first ring groove and the second ring groove respectively. The opening of the second placement groove 1136 facilitates the installation of the elastic ring 1132. The elastic ring 1132 makes the contact between the first sealing ring 1131 and the underwater paddle shaft 110 closer, and further squeezes the first sealing ring 1131, so that the sealing effect of the first sealing ring 1131 is better.

[0039] In this embodiment, a retaining ring 116 is fixedly arranged on the housing 100, and the retaining ring 116 and the underwater paddle shaft 110 are arranged coaxially, and the retaining ring 116 is located between the oil seal ring 113 and the bearing 115. One side of the bearing 115 abuts against the underwater paddle shaft 110, and the other side of the bearing 115 abuts against one side of the retaining ring 116. The other side of the retaining ring 116 abuts against the oil seal ring 113. The retaining ring 116 is used to limit the bearing 115, and the retaining ring 116 blocks the second placement groove 1136.

[0040] In this embodiment, the oil seal ring 113 is further provided with a third annular groove 117, which is located between the first annular groove and the second annular groove. The third annular groove 117 and the underwater propeller shaft 110 are arranged concentrically, and the third annular groove 117 communicates with the first annular groove and the second annular groove. The groove wall of the third annular groove 117 abuts against the underwater propeller shaft 110, and the micro-through holes 1137 are located on the groove wall of the third annular groove 117, and a plurality of micro-through holes 1137 are sequentially distributed along the circumference of the underwater propeller shaft 110.

[0041] The sealing mechanism also includes an annular block 120, which is coaxially arranged with the underwater paddle shaft 110, and the outer wall of the annular block 120 is fixedly connected to the second annular groove. The annular block 120 and the disc spring 114 are sequentially distributed along the direction from the second end to the first end of the underwater paddle shaft 110, and along the axial direction of the underwater paddle shaft 110, the side of the annular block 120 close to the bearing 115 abuts against the disc spring 114. An inclined surface is provided on the inner circumferential wall of the annular block 120, and along the direction from the second end to the first end of the underwater paddle shaft 110, the inclined surface of the annular block 120 gradually moves away from the underwater paddle shaft 110. There is a gap between the inclined surface of the annular block 120 and the underwater paddle shaft 110, and the gap is connected to the micro-through hole 1137. Along the axial direction of the underwater paddle shaft 110, the side of the annular block 120 close to the bearing 115 abuts against the disc spring 114.

[0042] In this embodiment, the inner side of the disc spring 114 abuts against the underwater paddle shaft 110, and the outer side of the disc spring 114 abuts against the groove wall of the second annular groove. The disc spring 114 includes a plurality of circular ring components, and the plurality of circular ring components are sequentially distributed along the axial direction of the underwater paddle shaft 110, and each circular ring component includes a first elastic ring 1141 and a second elastic ring 1142, and the first elastic ring 1141, the second elastic ring 1142 and the underwater paddle shaft 110 are concentrically arranged. The first elastic ring 1141 and the second elastic ring 1142 are tiltedly arranged, and along the direction from the second end to the first end of the underwater paddle shaft 110, the first elastic ring 1141 gradually moves away from the underwater paddle shaft 110, and the second elastic ring 1142 gradually approaches the underwater paddle shaft 110. The outer side of the first elastic ring 1141 in each circular ring component is fixedly connected to the outer side of the second elastic ring 1142. A first angle is formed between the first elastic ring 1141 and the second elastic ring 1142, and the first angle opens toward the underwater paddle shaft 110.

[0043] In two adjacent circular ring components, the inner side of the first elastic ring 1141 in one circular ring component is fixedly connected to the inner side of the second elastic ring 1142 in the other circular ring component, and a second angle is formed between the first elastic ring 1141 in one circular ring component and the second elastic ring 1142 in the other circular ring component, and the second angle opens toward the housing 100. The first elastic ring 1141 in the circular ring component close to the second end of the underwater paddle shaft 110 is used to abut against the annular block 120.

[0044] When the sealing oil in the oil seal cavity 1133 enters the buffer cavity 1134, the disc spring 114 is compressed. When the disc spring 114 is reset and extended, the first elastic ring 1141 gradually approaches the annular block 120 and presses the sealing oil in the buffer cavity 1134 back into the oil seal cavity 1133 through the inclined surface of the annular block 120 and the micro-through hole 1137.

[0045] In this embodiment, the sealing mechanism further includes an end cover 111, which is disposed on the underwater propeller shaft 110 and is coaxially disposed with the underwater propeller shaft 110. The end cover 111 is located on the side of the oil seal ring 113 away from the bearing 115. The end cover 111 is fixedly connected to the housing 100 by a fixing screw 112. The end cover 111 is used to limit the oil seal ring 113.

[0046] In this embodiment, a J-shaped leather cup 1111 is provided on the end cover 111, and the J-shaped leather cup 1111 is coaxially arranged with the underwater paddle shaft 110, and the inner wall of the J-shaped leather cup 1111 abuts against the underwater paddle shaft 110. A second sealing ring is provided at the contact point between the J-shaped leather cup 1111 and the end cover 111. The J-shaped leather cup 1111 forms a primary seal to prevent a large amount of liquid from directly contacting the oil seal ring 113.

[0047] In another embodiment, if Figures 1 to 8 As shown, a marine outboard propeller includes the above-mentioned sealing structure and a propeller 105. The first end of an underwater propeller shaft 110 is rotatably disposed in a housing 100, and the propeller 105 is fixedly disposed at the second end of the underwater propeller shaft 110. An exhaust port 101 is provided on the housing 100.

[0048] In another embodiment, a marine outboard propeller further includes a driving mechanism, which includes a motor, which is fixedly disposed in a housing 100, a first bevel gear is fixedly disposed on an output shaft of the motor, a second bevel gear is fixedly disposed on a first end of an underwater propeller shaft 110, and the first bevel gear and the second bevel gear are meshed. When the motor is started, the motor drives the underwater propeller shaft 110 to rotate through the first bevel gear and the second bevel gear.

[0049] A working process of a marine outboard propeller: in an initial state, there is sealing oil in the oil seal chamber 1133, and the disc spring 114 compresses the air in the buffer chamber 1134, and presses the air in the buffer chamber 1134 into the oil seal chamber 1133, thereby making the pressure in the oil seal chamber 1133 greater than the external pressure. The pressure in the oil seal chamber 1133 forms a positive pressure, preventing external water from entering the oil seal chamber 1133.

[0050] The motor is started, and the motor drives the underwater propeller shaft 110 to rotate through the first bevel gear and the second bevel gear, and the underwater propeller shaft 110 drives the propeller 105 to rotate, and the propeller 105 rotates to make the boat move forward. When the underwater propeller shaft 110 rotates, heat is generated, and the sealing oil in the oil seal cavity 1133 expands due to the heat, and then the sealing oil in the oil seal cavity 1133 flows into the buffer cavity 1134 through the micro-through hole 1137.

[0051] The sealing oil enters the buffer chamber 1134, so that the pressure in the buffer chamber 1134 is further increased, thereby pushing the disc spring 114, so that the first angle and the second angle between the first elastic ring 1141 and the second elastic ring 1142 are further reduced, the disc spring 114 is shortened as a whole, the first elastic ring 1141 gradually moves away from the annular block 120, and the space of the buffer chamber 1134 is further increased. In the process of the first elastic ring 1141 and the second elastic ring 1142 gradually approaching each other, the width of the first elastic ring 1141 and the second elastic ring 1142 along the radial direction of the underwater propeller shaft 110 increases, so that the first elastic ring 1141, the second elastic ring 1142 and the underwater propeller shaft 110 and the groove wall of the second ring groove are more tightly stuck, thereby preventing the sealing oil in the buffer chamber 1134 from overflowing from between the disc spring 114 and the underwater propeller shaft 110 and the second ring groove.

[0052] The deformation energy of the buffer cavity 1134 with variable space size and the disc spring 114 can balance the pressure, so that the sealing oil in the oil seal cavity 1133 enters the buffer cavity 1134 after expansion, preventing the sealing oil in the oil seal cavity 1133 from overflowing outward and causing waste of sealing oil.

[0053] When the speed of the underwater propeller shaft 110 is higher, the stern will be lowered and the bow will be lifted upward. At this time, the outer shell 100 is more submerged in the water, the underwater propeller shaft 110 enters deeper into the water, and the external pressure of the underwater propeller shaft 110 is greater. Due to the increase in the speed of the underwater propeller shaft 110, the underwater propeller shaft 110 generates more heat when rotating, the sealing oil in the oil seal cavity 1133 expands more, the pressure on the buffer cavity 1134 is greater, and the disc spring 114 is compressed more, thereby increasing the overall pressure of the oil seal cavity 1133 and the buffer cavity 1134, thereby adapting to the pressure of different water depths, and ensuring that the internal pressure of the oil seal cavity 1133 is always greater than the external pressure.

[0054] Finally, when the motor is turned off and the underwater propeller shaft 110 stops working, the compressed disc spring 114 stretches, the first elastic ring 1141 gradually approaches the annular block 120, and presses the sealing oil in the buffer chamber 1134 back into the oil seal chamber 1133 through the inclined surface and the micro-through hole 1137 of the annular block 120.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure is arranged in a housing on a marine outboard propeller, wherein an underwater propeller shaft is rotatably arranged in the housing, the underwater propeller shaft is arranged horizontally, and the two ends of the underwater propeller shaft are respectively a first end and a second end, and characterized in that: It includes a sealing mechanism, which includes an oil seal ring, a disc spring and a bearing; the oil seal ring, the disc spring and the bearing are all arranged on the underwater propeller shaft, the oil seal ring, the disc spring, the bearing and the underwater propeller shaft are arranged concentrically, and the oil seal ring, the disc spring and the bearing are distributed in sequence from the second end to the first end of the underwater propeller shaft; The oil seal ring is provided with a first ring groove, a second ring groove and a plurality of micro-through holes, and the first ring groove, the second ring groove and the oil seal ring are coaxially arranged; the first ring groove and the second ring groove are sequentially distributed along the direction from the second end to the first end of the underwater paddle shaft; the first ring groove and the underwater paddle shaft form an oil seal cavity, and the micro-through holes are connected with the first ring groove and the second ring groove; one side of the disc spring is against the bearing, and the other side of the disc spring is slidably arranged in the second ring groove, and the second ring groove, the underwater paddle shaft and the disc spring form a buffer cavity with a variable space size, and the oil seal cavity and the buffer cavity are used to store sealing oil.

2. A sealing structure according to claim 1, characterized in that: A first placement groove is also provided on the oil seal ring. The first placement groove is annular and is concentrically arranged with the oil seal ring. The first placement groove is located on the side of the first annular groove away from the second annular groove. The sealing mechanism also includes a first sealing ring, which is arranged in the first placement groove and abuts against the underwater paddle shaft.

3. A sealing structure according to claim 1, characterized in that: The oil seal ring is also provided with a second placement groove, which is annular in shape, and the first ring groove and the second ring groove are located in the inner ring of the second placement groove, and the first ring groove, the second ring groove and the second placement groove are coaxially arranged; the sealing mechanism also includes two elastic rings, the elastic ring and the underwater paddle shaft are concentrically arranged, the elastic ring is arranged in the second placement groove, and is against the groove wall of the second placement groove; the two elastic rings correspond to the first ring groove and the second ring groove respectively.

4. A sealing structure according to claim 1, characterized in that: A retaining ring is fixedly arranged on the outer shell, the retaining ring and the underwater propeller shaft are coaxially arranged, and the retaining ring is located between the oil seal ring and the bearing; one side of the bearing is against the underwater propeller shaft, and the other side of the bearing is against one side of the retaining ring; the other side of the retaining ring is against the oil seal ring.

5. A sealing structure according to claim 1, characterized in that: The oil seal ring is also provided with a third ring groove, which is located between the first ring groove and the second ring groove, and the third ring groove is concentrically arranged with the underwater propeller shaft, and the third ring groove is connected with the first ring groove and the second ring groove; the groove wall of the third ring groove abuts against the underwater propeller shaft, the micro-through hole is located on the groove wall of the third ring groove, and the plurality of micro-through holes are sequentially distributed along the circumference of the underwater propeller shaft; The sealing mechanism also includes an annular block, which is coaxially arranged with the underwater paddle shaft, and the outer wall of the annular block is fixedly connected to the second annular groove; the annular block and the disc spring are distributed in sequence along the direction from the second end to the first end of the underwater paddle shaft, and along the axial direction of the underwater paddle shaft, the side of the annular block close to the bearing is against the disc spring; an inclined surface is provided on the inner circumferential wall of the annular block, and along the direction from the second end to the first end of the underwater paddle shaft, the inclined surface of the annular block gradually moves away from the underwater paddle shaft; there is a gap between the inclined surface of the annular block and the underwater paddle shaft, and the gap is connected to the micro-through hole.

6. A sealing structure according to claim 5, characterized in that: The inner side of the disc spring abuts against the underwater paddle shaft, and the outer side of the disc spring abuts against the groove wall of the second ring groove; the disc spring includes a plurality of circular ring components, and the plurality of circular ring components are sequentially distributed along the axial direction of the underwater paddle shaft, and each circular ring component includes a first elastic ring and a second elastic ring, and the first elastic ring, the second elastic ring and the underwater paddle shaft are concentrically arranged; the first elastic ring and the second elastic ring are inclinedly arranged, and along the direction from the second end of the underwater paddle shaft to the first end, the first elastic ring gradually moves away from the underwater paddle shaft, and the second elastic ring gradually approaches the underwater paddle shaft; the outer side of the first elastic ring in each circular ring component is fixedly connected to the outer side of the second elastic ring; a first angle is formed between the first elastic ring and the second elastic ring, and the first angle opens toward the underwater paddle shaft; In two adjacent circular ring assemblies, the inner side of the first elastic ring in one circular ring assembly is fixedly connected to the inner side of the second elastic ring in the other circular ring assembly, and a second angle is formed between the first elastic ring in one circular ring assembly and the second elastic ring in the other circular ring assembly, and the second angle opens toward the outer shell; wherein the first elastic ring in the circular ring assembly close to the second end of the underwater paddle shaft is used to abut against the annular block.

7. A sealing structure according to claim 1, characterized in that: The sealing mechanism also includes an end cover, which is arranged on the underwater propeller shaft and coaxially arranged with the underwater propeller shaft; the end cover is located on the side of the oil seal ring away from the bearing; the end cover is fixedly connected to the housing through fixing screws.

8. A sealing structure according to claim 7, characterized in that: A J-shaped leather cup is arranged on the end cover, the J-shaped leather cup and the underwater paddle shaft are arranged coaxially, and the inner wall of the J-shaped leather cup and the underwater paddle shaft are against each other.

9. A marine outboard propeller, comprising a sealing structure as claimed in any one of claims 1 to 8, characterized in that: It also includes a propeller, the first end of the underwater propeller shaft is rotatably arranged in the shell, and the propeller is fixedly arranged at the second end of the underwater propeller shaft; an exhaust port is opened on the shell.

10. The marine outboard propeller according to claim 9, characterized in that: It also includes a driving mechanism, which includes a motor, the motor is fixedly arranged in the shell, a first bevel gear is fixedly arranged on the output shaft of the motor, a second bevel gear is fixedly arranged on the first end of the underwater paddle shaft, and the first bevel gear and the second bevel gear are meshed.

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