Sealing system for outboard engine test

Abstract

The utility model discloses a sealing system for an outboard engine test, which comprises a separation box arranged on one side of a test water tank and 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 exhaust back pressure is reduced by the cooling water, and the temperature of the cooling water rises and the cooling water is polluted by the tail gas are solved.

Description

Technical Field

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

[0002] When the existing outboard motor test bench is running, the power and torque of the outboard motor test bench are transmitted through the propeller shaft. The propeller shaft and the drive 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 drive shaft. Therefore, there is a problem that the cooling water in the water tank used to cool 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. Utility Model Content

[0004] Based on the above problems, the purpose of the present utility model 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 systems 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 sealedly connected to the second axial end of the connecting sleeve and a second axial end thereof is sealedly connected to the partition box;

[0010] A transmission shaft is provided in 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 connected to the dynamometer through the partition box.

[0011] Furthermore, the flexible bellows is provided with a first bellows flange at the first axial end and a second bellows flange at the second axial end. The first bellows flange is sealed to the connecting sleeve, and the second bellows flange is sealed 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 periphery of the through hole, and the second bellows flange is sealedly 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. This sealing system can separate the drive shaft, propeller shaft and cooling water, solving the problem of cooling water reducing exhaust back pressure. It can also prevent problems such as exhaust gas causing high cooling water temperature and cooling water being contaminated by exhaust gas.

[0022] 2. The flexible bellows used have a highly elastic sealing effect, facilitating the transmission connection between the transmission shaft, drive shaft assembly, and 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. It has a simple structure and is 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

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

[0026] Figure 2 It is a partial structural diagram of an embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of a partially disassembled structure of an embodiment of the present utility model;

[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. Drive 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. First sealing ring;

[0040] 12. Second sealing ring;

[0041] 13. Test the water tank;

[0042] 14. Water body. DETAILED DESCRIPTION

[0043] The above scheme is further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those used in routine experiments.

[0044] See also Figures 1 to 3 , is a structural schematic diagram of an embodiment of the utility model, which 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 the 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 contaminate the cooling water. Therefore, the sealing system is added.

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

[0047] The connecting sleeve 3 has an axial first end fixed to the outboard motor 4 and covers the outside of the propeller shaft 4 - 1 of the outboard motor 4 , and an axial second end sealed to the axial first 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. 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] The flexible bellows 2 is provided with a first bellows flange 2-1 at the first axial end and a second bellows flange 2-2 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. An internal thread can be set on the first bellows flange 2-1, and an external thread matching the first bellows flange 2-1 can be set on the second connecting portion 3-3. The sealed 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. The second bellows flange 2-2 is fixedly connected to the connecting flange 1-1 via bolts.

[0053] The transmission shaft 5 is passed through the flexible bellows 2 , a first axial end of the transmission shaft 5 is spline-connected to the propeller shaft 4 - 1 and a second axial end of the transmission shaft 5 is transmission-connected to the dynamometer 10 via the 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 separation box 1. The exhaust gas of the outboard motor enters the separation box 1 after passing through the connecting sleeve 3 and the flexible bellows 2, thereby preventing the problem of the cooling water being heated up and polluted by the exhaust gas of the outboard motor, and also solving the problem of the cooling water reducing the exhaust back pressure.

[0058] The above examples are intended only to illustrate the technical concepts and features of this utility model. Their purpose is to enable those familiar with the art to understand the content of this utility model and implement it accordingly. They are not intended to limit the scope of protection of this utility model. Any equivalent changes or modifications based on the spirit of this utility model shall be included in the scope of protection of this utility model.

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 sealedly connected to the second axial end of the connecting sleeve and a second axial end thereof is sealedly connected to the partition box; A transmission shaft is provided in 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 connected to the dynamometer through the partition box.

2. The sealing system for outboard motor testing according to claim 1, characterized in that: The flexible bellows is provided with a first bellows flange at a first axial end and a second bellows flange at a second axial end. The first bellows flange is sealed to the connecting sleeve, and the second bellows flange is sealed 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, a connecting flange is provided on the outer periphery of the through hole, and the second bellows flange is sealedly 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 includes 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 drive 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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