Stern shaft tube sealing device for high-speed boat and surface paddle propulsion system

Abstract

The utility model discloses a stern shaft tube sealing device for a high-speed boat and a surface paddle propulsion system, which comprises a stern shaft tube and a stern shaft rotatably mounted in the stern shaft tube through a rotating bearing, and the sealing device comprises a stern shaft bushing, a front sealing ring, a rear sealing ring, a sealing gasket and a rear end cover plate, at least one front sealing ring arranged on the stern shaft lining in a sleeving mode is arranged in the stern shaft tube, the rear end cover plate is fixed to the rear end of the stern shaft tube, the sealing gasket is fixed between the stern shaft tube and the rear end cover plate, and the rear sealing ring is located between the sealing gasket and the rear end cover plate. The front sealing ring located at the front end plays a role in preventing anti-wear hydraulic oil from leaking, the front sealing ring and the rear sealing ring located at the rear end play a role in preventing water and impurities from entering the stern shaft tube, pollution to the anti-wear hydraulic oil is avoided, normal use of the anti-wear hydraulic oil and a propelling system is guaranteed, and the service life of the propelling system is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of surface propellers, in particular to a stern tube sealing device for a high-speed boat and a surface propeller propulsion system. Background Art

[0002] With the development of ship propulsion systems, people have higher and higher requirements for ship speeds. Conventional propellers can no longer meet the speed requirements of high-speed boats and official boats. The surface propeller drive device is an important special ship propulsion system. Due to its high efficiency, ability to reduce the appendage resistance of speedboats, and reduce blade erosion, the surface propeller drive device has become one of the main propulsion methods for boats with a speed of more than 40kn, and has good application prospects and military value. Since the tail end of the stern tube of the surface propeller drive device is immersed in water most of the time under actual working conditions, and the stern tube is filled with anti-wear hydraulic oil to ensure the lubrication of the internal structure, the sealing of the stern tube is particularly important. If the seal is not good, it will cause the lubricating oil to leak and water and impurities will easily enter the drive device, which will damage the internal structure and affect normal use. Utility Model Content

[0003] In view of the above-mentioned deficiencies, the technical problem to be solved by the utility model is to provide a stern tube sealing device for a high-speed boat and a surface propeller propulsion system, which can effectively prevent water and impurities from entering the stern tube, ensure the normal use of anti-wear hydraulic oil and the propulsion system, and extend the service life of the propulsion system.

[0004] To solve the above-mentioned first technical problem, the technical solution of the utility model is:

[0005] A stern tube sealing device for a surface propeller propulsion system, a stern tube and a stern shaft rotatably installed in the stern tube through a rotating bearing, the sealing device comprising: a stern shaft bushing, a front sealing ring, a rear sealing ring, a sealing gasket and a rear end cover plate, the stern shaft bushing is fixed on the stern shaft, at least one front sealing ring sleeved on the stern shaft bushing is provided in the stern tube, the rear end cover plate is fixed to the rear end of the stern tube, the sealing gasket is fixed between the stern tube and the rear end cover plate, and the rear sealing ring is located between the sealing gasket and the rear end cover plate.

[0006] Preferably, a sealing gasket is provided between the sealing gasket and the stern tube.

[0007] Preferably, the rear end cover plate is provided with an annular contoured groove matched with the rear sealing ring, and the rear sealing ring is located in the annular contoured groove.

[0008] Preferably, a gap is provided between the front sealing ring located at the rear end and the sealing gasket.

[0009] Preferably, the front sealing ring located at the rear end abuts against the sealing gasket.

[0010] Preferably, a sealing ring positioning shoulder is provided on the stern tube, and the front sealing ring located at the front end abuts against the sealing ring positioning shoulder.

[0011] In order to solve the above second technical problem, the technical solution of the utility model is:

[0012] A high-speed boat comprises: a ball seat, a sphere, an intermediate shaft, a double cross universal joint, a stern tube, a rotating bearing, a stern shaft and a sealing device arranged between the stern tube and the stern shaft, wherein the ball seat is fixed to a stern sealing plate, the sphere is located in the ball seat and the two form a ball joint structure, the intermediate shaft is rotatably installed in the ball seat, the intermediate shaft is connected to the stern shaft through a double cross universal joint, the stern shaft is rotatably installed in the stern tube through the rotating bearing, and the sealing device is the stern tube sealing device for the surface propeller propulsion system mentioned above.

[0013] Preferably, a bearing locating shoulder and a retaining spring are provided on the stern tube, and the outer ring of the rotating bearing abuts between the bearing locating shoulder and the retaining spring.

[0014] Preferably, the stern shaft is provided with a shaft shoulder, and the inner ring of the rotary bearing abuts between the shaft shoulder and the stern shaft bushing.

[0015] Preferably, the stern shaft bushing is fixed to the stern shaft by means of interference fit.

[0016] After adopting the above technical solution, the beneficial effects of the utility model are:

[0017] The front sealing ring at the front end prevents the leakage of the anti-wear hydraulic oil, the front sealing ring at the rear end prevents water and impurities from entering the interior of the stern tube, and the rear sealing ring is used to seal the gap between the rear end cover plate and the stern bushing, further preventing water and impurities from entering the interior of the stern tube, further enhancing the sealing performance of the stern tube, avoiding contamination of the anti-wear hydraulic oil, ensuring the normal use of the anti-wear hydraulic oil and the propulsion system, and extending the service life of the propulsion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a surface propeller propulsion system in an embodiment of a high-speed boat of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged structural diagram of the middle A part;

[0020] In the figure: 1, intermediate shaft; 2, ball seat; 3, sphere; 4, stern tube; 41, sealing ring locating shoulder; 42, bearing locating shoulder; 5, stern shaft; 51, shaft shoulder; 6, rotating bearing; 7, skeleton type rubber oil seal; 8, rear sealing ring; 9, rear end cover plate; 10, stern shaft bushing; 11, sealing gasket; 12, sealing gasket; 13, retaining ring; 14, double cross universal joint. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] Embodiment 1

[0023] like Figure 1 and Figure 2 As shown together, a stern tube sealing device for a surface propeller propulsion system, a stern tube 4 and a stern shaft 5 rotatably mounted in the stern tube 4 through a rotating bearing 6, the sealing device comprises: a stern shaft bushing 10, a front sealing ring, a rear sealing ring 8, a sealing gasket 11 and a rear end cover plate 9, the stern shaft bushing 10 is fixed on the stern shaft 5, at least one front sealing ring sleeved on the stern shaft bushing 10 is provided in the stern tube 4, the rear end cover plate 9 is fixed to the rear end of the stern tube 4, the sealing gasket 11 is fixed between the stern tube 4 and the rear end cover plate 9, and the rear sealing ring 8 is located between the sealing gasket 11 and the rear end cover plate 9. In the illustrated embodiment, the front sealing ring is preferably a skeleton rubber oil seal 7, and the skeleton rubber oil seal 7 is preferably three. The rear sealing ring 8 is preferably a JD-type sealing ring or a J-type sealing ring.

[0024] The skeleton-type rubber oil seal 7 at the front end prevents leakage of the anti-wear hydraulic oil, and the two skeleton-type rubber oil seals 7 at the rear end prevent water and impurities from entering the interior of the stern tube. The rear sealing ring 8 is used to seal the gap between the rear end cover plate 9 and the stern bushing 10, further preventing water and impurities from entering the interior of the stern tube 4, further enhancing the sealing performance of the stern tube 4, avoiding contamination of the anti-wear hydraulic oil, ensuring the normal use of the anti-wear hydraulic oil and the propulsion system, and extending the service life of the propulsion system.

[0025] Furthermore, in order to prevent water and impurities from entering the interior of the stern tube 4 from the gap between the sealing gasket 11 and the stern tube 4 , a sealing gasket 12 is provided between the sealing gasket 11 and the stern tube 4 .

[0026] In the illustrated embodiment, an annular contoured groove adapted to the rear sealing ring 8 is provided on the rear end cover plate 9, and the rear sealing ring 8 is located in the annular contoured groove.

[0027] In the illustrated embodiment, a small gap is provided between the skeleton rubber oil seal 7 at the rear end and the sealing gasket 11 , or the skeleton rubber oil seal 7 at the rear end abuts against the sealing gasket 11 , and the sealing gasket 11 axially positions the skeleton rubber oil seal 7 .

[0028] The stern tube 4 is provided with a sealing ring positioning shoulder 41 , and the skeleton type rubber oil seal 7 located at the front end abuts against the sealing ring positioning shoulder 41 to perform axial positioning on the skeleton type rubber oil seal 7 .

[0029] Embodiment 2

[0030] A high-speed boat comprises: a ball seat 2, a ball body 3, an intermediate shaft 1, a double cross universal joint 14, a stern tube 4, a rotary bearing 6, a stern shaft 5 and a sealing device arranged between the stern tube 4 and the stern shaft 5, wherein the sealing device is the stern tube sealing device for the surface propeller propulsion system of the first embodiment;

[0031] The ball seat 2 is fixed on the stern cover plate, the ball 3 is located and installed in the ball seat 2 and a ball joint structure is formed between the two, the intermediate shaft 1 is rotatably installed in the ball seat 2, the intermediate shaft 1 is connected to the stern shaft 5 through a double cross universal joint 14, and the stern shaft 5 is rotatably installed in the stern shaft tube 4 through a rotating bearing 6.

[0032] The stern tube 4 is provided with a bearing positioning shoulder 42 and a retaining ring 13, and the outer ring of the rotating bearing 6 abuts between the bearing positioning shoulder 42 and the retaining ring 13. The stern shaft 5 is provided with a shaft shoulder 51, and the inner ring of the rotating bearing 6 abuts between the shaft shoulder 51 and the stern shaft bushing 10.

[0033] The stern shaft bushing 10 is fixed on the stern shaft 5 by interference fit or welding.

[0034] The above are examples of the best implementation methods of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the utility model is also within the protection scope of the utility model.

Claims

1. A stern tube sealing device for a surface propeller propulsion system, comprising a stern tube and a stern shaft rotatably mounted in the stern tube via a rotary bearing, characterized in that: The sealing device comprises: a stern shaft bushing, a front sealing ring, a rear sealing ring, a sealing gasket and a rear end cover plate, the stern shaft bushing is fixed on the stern shaft, the stern shaft tube is provided with at least one front sealing ring sleeved on the stern shaft bushing, the rear end cover plate is fixed to the rear end of the stern shaft tube, the sealing gasket is fixed between the stern shaft tube and the rear end cover plate, and the rear sealing ring is located between the sealing gasket and the rear end cover plate.

2. The stern tube sealing device for a surface propeller propulsion system according to claim 1, characterized in that: A sealing gasket is provided between the sealing gasket and the stern tube.

3. The stern tube sealing device for a surface propeller propulsion system according to claim 2, characterized in that: The rear end cover plate is provided with an annular profiling groove adapted to the rear sealing ring, and the rear sealing ring is located in the annular profiling groove.

4. The stern tube sealing device for a surface propeller propulsion system according to claim 2, characterized in that: A gap is provided between the front sealing ring located at the rear end and the sealing gasket.

5. The stern tube sealing device for a surface propeller propulsion system according to claim 2, characterized in that: The front sealing ring located at the rear end abuts against the sealing gasket.

6. The stern tube sealing device for a surface propeller propulsion system according to claim 1, characterized in that: The stern tube is provided with a sealing ring positioning shoulder, and the front sealing ring located at the front end abuts against the sealing ring positioning shoulder.

7. A high-speed boat, comprising: A ball seat, a sphere, an intermediate shaft, a double cross universal joint, a stern tube, a rotating bearing, a stern shaft and a sealing device arranged between the stern tube and the stern shaft, wherein the ball seat is fixed to a stern sealing plate, the sphere is located in the ball seat and the two form a ball joint structure, the intermediate shaft is rotatably installed in the ball seat, the intermediate shaft is connected to the stern shaft through a double cross universal joint, and the stern shaft is rotatably installed in the stern tube through the rotating bearing, and is characterized in that the sealing device is a stern tube sealing device for a surface propeller propulsion system according to any one of claims 1 to 6.

8. The high-speed boat according to claim 7, characterized in that: The stern tube is provided with a bearing positioning shoulder and a retaining spring, and the outer ring of the rotating bearing abuts between the bearing positioning shoulder and the retaining spring.

9. The high-speed boat according to claim 7, characterized in that: The stern shaft is provided with a shaft shoulder, and the inner ring of the rotary bearing abuts between the shaft shoulder and the stern shaft bushing.

10. The high-speed boat according to claim 7, characterized in that: The stern shaft bushing is fixed on the stern shaft by means of interference fit.

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