Sealing system for outboard engine test

Abstract

The invention discloses a sealing system for an outboard engine test, and the system comprises a separation box which is disposed at one side of a test water tank and is separated from a water body; the first axial end of the connecting sleeve is fixed on the outboard engine and covers the outer part of a propeller shaft of the outboard engine; the first axial end of the flexible corrugated pipe is in sealed connection with the second axial end of the connecting sleeve, and the second axial end of the flexible corrugated pipe is in sealed connection with the separation box; the transmission shaft is arranged in the flexible corrugated pipe in a penetrating mode, the first axial end of the transmission shaft is connected with the propeller shaft, and the second axial end of the transmission shaft is in transmission connection with a dynamometer through the separation box. According to the sealing system for outboard engine testing, separation of tail gas and cooling water can be achieved, and the problems that the cooling water reduces the exhaust back pressure, the temperature of the cooling water rises due to the tail gas, and the cooling water is polluted are solved.

Description

Technical Field

[0001] The invention relates to the technical field of outboard motor testing, and in particular to a sealing system for outboard motor testing. Background Art

[0002] When the existing outboard motor test bench is running, the power torque of the outboard motor test bench is transmitted through the propeller shaft. The propeller shaft and the transmission shaft must be connected to the dynamometer through a cooling water tank, and the exhaust gas emissions of the outboard motor can only be discharged through the underwater propeller shaft and the transmission shaft. Therefore, there is a problem that the cooling water in the water tank for cooling the outboard motor itself is mixed with the exhaust gas emissions of the outboard motor.

[0003] The above structure may cause problems such as cooling water reducing exhaust back pressure, exhaust gas causing high temperature of the cooling water tank, and cooling water tank being polluted by exhaust gas. Summary of the invention

[0004] Based on the above problems, an object of the present invention is to provide a sealing system for outboard motor testing, which can separate the outboard motor exhaust from the cooling water tank.

[0005] In order to solve the problems in the prior art, the technical solution provided by the present invention is:

[0006] Sealing system for outboard motor testing, including:

[0007] A separation box, which is arranged at one side of the test water tank and separated from the water body;

[0008] A connecting sleeve, a first axial end of which is fixed to the outboard motor and covers the outside of the propeller shaft of the outboard motor;

[0009] A flexible bellows, wherein a first axial end thereof is sealingly connected to a second axial end of the connecting sleeve and a second axial end thereof is sealingly connected to the partition box;

[0010] A transmission shaft is inserted into the flexible bellows, wherein a first axial end of the transmission shaft is connected to the propeller shaft and a second axial end of the transmission shaft is transmission-connected to the dynamometer via the partition box.

[0011] Furthermore, a first bellows flange is provided at the first axial end of the flexible bellows and a second bellows flange is provided at the second axial end, the first bellows flange is sealingly connected to the connecting sleeve, and the second bellows flange is sealingly connected to the partition box.

[0012] Furthermore, the connecting sleeve includes a sleeve body, a first connecting portion arranged at the first axial end of the sleeve body, and a second connecting portion arranged at the second axial end of the sleeve body, the first connecting portion is sealed and fixed to the outer periphery of the propeller shaft, and the second connecting portion is threadedly connected to the first bellows flange.

[0013] Furthermore, a first sealing ring is provided between the first connecting portion and the outboard motor.

[0014] Furthermore, the partition box is provided with a through hole for the transmission shaft to pass through, a connecting flange is provided on the outer periphery of the through hole, and the second bellows flange is sealingly connected to the connecting flange.

[0015] Furthermore, a second sealing ring is provided between the connecting flange and the second bellows flange.

[0016] Furthermore, the power output end of the dynamometer is connected to the transmission shaft via a drive shaft assembly, and the drive shaft assembly is supported by a drive shaft fixing seat.

[0017] Furthermore, the drive shaft assembly includes a plurality of drive shafts connected in sequence, and two adjacent drive shafts are connected via a shaft head flange.

[0018] Furthermore, the second axial end of the transmission shaft extends into the partition box and is connected to the drive shaft extending into the partition box via a diaphragm connector.

[0019] Furthermore, the first axial end of the transmission shaft is connected to the propeller shaft via a spline.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The sealing system can separate the transmission shaft, propeller shaft and cooling water, solving the problem of cooling water reducing exhaust back pressure. It can also avoid problems such as high cooling water temperature caused by exhaust gas and cooling water being polluted by exhaust gas.

[0022] 2. The flexible bellows used has a high elastic sealing effect, which facilitates the transmission connection between the transmission shaft and the drive shaft assembly and the propeller shaft, while ensuring the sealing effect;

[0023] 3. The exhaust gas at the propeller shaft position is discharged through the connecting sleeve, flexible bellows and separation box to separate the exhaust gas and cooling water. The structure is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a sealing system for outboard motor testing of the present invention;

[0026] Figure 2It is a partial structural schematic diagram of an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of a partially disassembled structure of an embodiment of the present invention;

[0028] in:

[0029] 1. Partition box; 1-1. Connecting flange;

[0030] 2. Flexible bellows; 2-1. First bellows flange; 2-2. Second bellows flange;

[0031] 3. Connecting sleeve; 3-1. Sleeve body; 3-2. First connecting portion; 3-2a. Limiting groove; 3-3. Second connecting portion;

[0032] 4. Outboard motor; 4-1. Propeller shaft;

[0033] 5. Transmission shaft;

[0034] 6. Drive shaft;

[0035] 7. Shaft head flange;

[0036] 8. Drive shaft fixing seat;

[0037] 9. Diaphragm connector;

[0038] 10. Dynamometer;

[0039] 11. The first sealing ring;

[0040] 12. Second sealing ring;

[0041] 13. Test water tank;

[0042] 14. Water body. DETAILED DESCRIPTION

[0043] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present invention and are not limited to the scope of the present invention. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0044] See also Figures 1 to 3 , which is a structural schematic diagram of an embodiment of the present invention, provides a sealing system for outboard motor testing, including a partition box 1, a connecting sleeve 3, a flexible bellows 2 and a transmission shaft 5 passing through the flexible bellows 2.

[0045] When testing the outboard motor, the outboard motor is installed on the test bench, and the propeller shaft 4-1 of the outboard motor 4 is immersed in the test water tank 13. The propeller shaft 4-1 is connected to the dynamometer 10 via the transmission shaft 5. Since the propeller shaft 4-1 and the transmission shaft 5 are both immersed in cooling water, the exhaust gas generated by the outboard motor 4 will mix with the cooling water, causing the cooling water temperature to rise. The exhaust gas will also pollute the cooling water. Therefore, the sealing system is added.

[0046] The above-mentioned partition box 1 is arranged on one side of the test water tank 13 and is separated from the water body 14. For example, a separate box body can be arranged as the partition box 1, or a partition can be arranged in the test water tank 13 to form an independent sealed space as the partition box 1.

[0047] The connecting sleeve 3 has a first axial end fixed on the outboard motor 4 and covers the outside of the propeller shaft 4 - 1 of the outboard motor 4 , and a second axial end sealedly connected to the first axial end of the flexible bellows 2 .

[0048] Specifically, the connecting sleeve 3 includes a sleeve body 3-1, a first connecting portion 3-2 arranged at the first axial end of the sleeve body 3-1, and a second connecting portion 3-3 arranged at the second axial end of the sleeve body 3-1. The first connecting portion 3-2 is sealed and fixed to the outer periphery of the propeller shaft 4-1, and the second connecting portion 3-3 is sealed and matched with the flexible bellows 2.

[0049] In order to ensure the sealing performance, a first sealing ring 11 is provided between the first connecting part 3-2 and the outboard motor 4, and a limiting groove 3-2a for accommodating the first sealing ring 11 is provided on the side of the first connecting part 3-2 facing the outboard motor 4, and at least two connecting ears are formed on the first connecting part 3-2, and the connecting ears are fixed to the outboard motor 4 by screws.

[0050] A first bellows flange 2-1 is provided at the first axial end of the flexible bellows 2 and a second bellows flange 2-2 is provided at the second axial end. The first bellows flange 2-1 is sealedly connected to the second connecting portion 3-3 of the connecting sleeve 3, and the second bellows flange 2-2 is sealedly connected to the partition box 1, wherein the second connecting portion 3-3 is threadedly connected to the first bellows flange 2-1, and an internal thread can be arranged on the first bellows flange 2-1, and an external thread matching the first bellows flange 2-1 can be arranged on the second connecting portion 3-3. The sealing connection between the connecting sleeve 3 and the flexible bellows 2 is achieved through the matching of the internal thread and the external thread.

[0051] In order to facilitate the connection between the transmission shaft 5 and the dynamometer 10, a through hole for the transmission shaft 5 to pass through is provided on the partition box 1, a connecting flange 1-1 is provided on the periphery of the through hole, and the second bellows flange 2-2 is sealed and connected to the connecting flange 1-1.

[0052] In order to improve the sealing performance, a second sealing ring 12 is provided between the connecting flange 1-1 and the second bellows flange 2-2, and the second bellows flange 2-2 is fixedly connected to the connecting flange 1-1 via bolts.

[0053] The transmission shaft 5 is inserted into the flexible bellows 2 , a first axial end of the transmission shaft 5 is connected to the propeller shaft 4 - 1 via a spline, and a second axial end of the transmission shaft 5 is transmission-connected to the dynamometer 10 via a partition box 1 .

[0054] In this example, the power output end of the dynamometer 10 is connected to the transmission shaft 5 via a drive shaft assembly, and the drive shaft assembly is supported by a drive shaft fixing seat 8 .

[0055] Specifically, the drive shaft assembly includes a plurality of drive shafts 6 connected in sequence, and two adjacent drive shafts 6 are connected via a shaft head flange 7 .

[0056] In this example, the second axial end of the transmission shaft 5 extends into the partition box 1 and is connected to the drive shaft 6 extending into the partition box 1 via the diaphragm connector 9 .

[0057] The above-mentioned sealing system separates the transmission shaft 5, the propeller shaft 4-1 and the cooling water through the connecting sleeve 3, the flexible bellows 2 and the separating box 1. The exhaust gas of the outboard engine enters the separating box 1 after passing through the connecting sleeve 3 and the flexible bellows 2, thereby avoiding the problem of the cooling water being heated up and polluted by the exhaust gas of the outboard engine, and also solving the problem of the cooling water reducing the exhaust back pressure.

[0058] The above examples are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing system for outboard motor testing, characterized in that: include: A separation box, which is arranged at one side of the test water tank and separated from the water body; A connecting sleeve, a first axial end of which is fixed to the outboard motor and covers the outside of the propeller shaft of the outboard motor; A flexible bellows, wherein a first axial end thereof is sealingly connected to a second axial end of the connecting sleeve and a second axial end thereof is sealingly connected to the partition box; A transmission shaft is inserted into the flexible bellows, wherein a first axial end of the transmission shaft is connected to the propeller shaft and a second axial end of the transmission shaft is transmission-connected to the dynamometer via the partition box.

2. The sealing system for outboard motor testing according to claim 1, characterized in that: The first axial end of the flexible bellows is provided with a first bellows flange and the second axial end is provided with a second bellows flange. The first bellows flange is sealedly connected to the connecting sleeve, and the second bellows flange is sealedly connected to the partition box.

3. The sealing system for outboard motor testing according to claim 2, characterized in that: The connecting sleeve includes a sleeve body, a first connecting portion arranged at the first axial end of the sleeve body, and a second connecting portion arranged at the second axial end of the sleeve body. The first connecting portion is sealed and fixed to the outer periphery of the propeller shaft, and the second connecting portion is threadedly connected to the first bellows flange.

4. The sealing system for outboard motor testing according to claim 3, characterized in that: A first sealing ring is provided between the first connecting portion and the outboard motor.

5. The sealing system for outboard motor testing according to claim 2, characterized in that: The partition box is provided with a through hole for the transmission shaft to pass through, the outer periphery of the through hole is provided with a connecting flange, and the second bellows flange is sealingly connected to the connecting flange.

6. The sealing system for outboard motor testing according to claim 5, characterized in that: A second sealing ring is provided between the connecting flange and the second bellows flange.

7. The sealing system for outboard motor testing according to claim 1, characterized in that: The power output end of the dynamometer is connected to the transmission shaft via a drive shaft assembly, and the drive shaft assembly is supported by a drive shaft fixing seat.

8. The sealing system for outboard motor testing according to claim 7, characterized in that: The drive shaft assembly comprises a plurality of drive shafts connected in sequence, and two adjacent drive shafts are connected via a shaft head flange.

9. The sealing system for outboard motor testing according to claim 8, characterized in that: The second axial end of the transmission shaft extends into the partition box and is connected to the driving shaft extending into the partition box via a diaphragm connector.

10. The sealing system for outboard motor testing according to claim 1, characterized in that: The first axial end of the transmission shaft is connected to the propeller shaft via a spline.

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