An outboard motor assembly performance test bench

Abstract

The present invention relates to an outboard motor assembly performance test bench, which belongs to the technical field of engine performance testing, and comprises a test bracket, a dynamometer for testing the performance of an outboard motor assembly, an outboard motor assembly fixing device, and a connection water seal system between the outboard motor assembly and the test bracket; the outboard motor assembly is mounted on the outboard motor assembly fixing device, and the output shaft of the outboard motor propeller passes through the connection water seal system and is connected to the dynamometer via a transmission shaft. The present invention avoids the transmission shaft between the propeller output shaft and the dynamometer from being immersed in water for a long time by designing a complete set of water seal systems, using a universal shaft connection, and adopting a three-dimensional flexible fastening scheme for the outboard motor assembly, greatly reducing the requirements for the centering degree, and eliminating the limitation of the water tank on the transition shaft when the dynamometer and the propeller shaft pass through the water tank for centering; and effectively solves the problems of high centering accuracy requirements of the outboard motor assembly test bench, limited centering position of the transmission shaft, and poor stability and reliability of the bench.

Description

Technical Field

[0001] The invention relates to the technical field of engine performance testing, in particular to an outboard motor assembly performance test bench. Background Art

[0002] An outboard motor is a propulsion engine installed on the outside of the hull (side of the ship). According to the different energy sources, it is divided into fuel outboard motors and electric outboard motors. The working principle of a fuel outboard motor is to convert the chemical energy of the 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 use a recyclable battery as an energy source, and convert electrical energy into kinetic energy through an electric motor. According to the installation position of the motor, it is divided into top-mounted and bottom-mounted types. The main performance indicator of an outboard motor is the propulsion characteristic indicator, and the performance of the outboard motor needs to be evaluated in the form of an outboard motor assembly (single engine and bottom-mounted fully assembled), and the output power, speed, torque and other parameter indicators of the propeller shaft are evaluated.

[0003] The propeller shaft of an outboard motor is relatively slender. After adding a transition shaft to the dynamometer, the alignment accuracy is very high. If the alignment accuracy is not enough during bench testing, the propeller shaft is very susceptible to fatigue fracture due to bending and twisting torque. Due to the need to simulate the underwater operating environment of the outboard motor, the drive shaft of both single and double water tanks is currently limited by the water tank, which increases the difficulty of alignment. During the outboard motor assembly test, the propeller shaft will swing violently when the whole machine is started and running at high speed and high load. In this state, the propeller shaft will be affected by stress and will cause fatigue fracture, so it is necessary to improve the stability and reliability of the outboard motor assembly test bench. Summary of the invention

[0004] The purpose of the present invention is to provide an outboard motor assembly performance test bench, which solves the problems of high centering accuracy requirements of the outboard motor assembly test bench, limited centering position of the transmission shaft, and poor stability and reliability of the bench; the present invention simulates the operating environment of the outboard motor in water, and the lower device can use its own water suction pump to suck water from a water tank to fully cool the lower device, thereby simulating the working environment of the lower device underwater to the greatest extent.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An outboard motor assembly performance test bench comprises a test bracket, a dynamometer for testing the performance of the outboard motor assembly, an outboard motor assembly fixing device and a connecting water seal system between the outboard motor assembly and the test bracket; the outboard motor assembly is mounted on the outboard motor assembly fixing device, and the output shaft of the outboard motor propeller is connected to the dynamometer through a transmission shaft passing through the connecting water seal system; the connecting water seal system comprises a fixed sleeve sleeved outside a universal shaft and locked with a water seal sleeve, a movable sealing sleeve arranged outside the fixed sleeve and locked with a transition shaft sleeve by a clamp, a transition shaft sleeve fixedly mounted on the output shaft of the outboard motor propeller, and a universal shaft connected to the transition shaft and the transition shaft sleeve; a guide rail is also arranged on the water seal sleeve, and the movable sealing sleeve can slide on the fixed sleeve along the guide rail; the propeller output shaft and the transition shaft sleeve are on the same axis.

[0007] A further improvement of the technical solution of the present invention is that the test bracket includes a water tank arranged at the lower end of the bracket, a water seal sleeve fixedly installed with the water tank, an elastic coupling connected to the dynamometer and fixed with the transition shaft, and a bearing fixedly installed in the water seal sleeve; each time the outboard motor assembly is moved up and down the stand, the elastic coupling, the transition shaft, the dynamometer, the water seal sleeve, and the bearing are fixedly fixed.

[0008] A further improvement of the technical solution of the present invention is that the outboard motor assembly fixing device includes a bracket with a flexible block provided at the contact portion with the outboard motor, a flexible holding block that locks the outboard motor assembly together with the bracket, and a back plate for hanging the outboard motor assembly.

[0009] A further improvement of the technical solution of the present invention is that a compressed air inlet and a compressed air outlet are also provided on the water seal sleeve.

[0010] A further improvement of the technical solution of the present invention is that an overflow port, a water inlet and a water outlet are arranged on the water tank.

[0011] A further improvement of the technical solution of the present invention is that a water temperature level sensor for testing the water temperature is also arranged in the water tank.

[0012] A further improvement of the technical solution of the present invention is that the transmission shaft includes a transition shaft and a universal shaft, and a connecting flange on one side of the universal shaft is fixedly mounted on the transition shaft.

[0013] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are as follows:

[0014] 1. According to the characteristics of the outboard motor assembly, the present invention designs a three-dimensional bracket from top to bottom for fixing, and flexible blocks are provided at the contact parts between the bracket and the flexible holding block and the outboard motor assembly, thereby solving the problem of loose support of the test bench caused by the violent swing of the outboard motor assembly at startup and high speed and high load, and increasing the stability and reliability of the test bench.

[0015] 2. In the present invention, since the connection between the dynamometer and the water tank is fixed and passes through a water seal sleeve, the problem of the water tank limiting the shaft when the transition shaft is directly aligned with the propeller output shaft is avoided, and water leakage from the water tank is avoided.

[0016] 3. The water seal system structure designed in the present invention, the water seal sleeve, the fixed sleeve, the movable sealing sleeve and the transition sleeve form a closed environment, which avoids the damage of the universal joint shaft due to operation immersed in water and avoids the problem of the transmission shaft between the propeller output shaft and the dynamometer being immersed in water for a long time.

[0017] 4. The design of the universal shaft in the present invention eliminates the problem of the water tank limiting the transition shaft when the dynamometer and the propeller output shaft are aligned through the water tank, solves the problem of high alignment requirements for the propeller output shaft, greatly reduces the risk of broken shafts caused by insufficient alignment accuracy of the propeller output shaft, and effectively solves the problem of easy fatigue fracture of the propeller shaft due to high alignment requirements in the outboard motor assembly test.

[0018] 5. The water tank in the present invention simulates the working environment of the outboard motor in water, which increases the accuracy and authenticity of the test data. The water temperature and liquid level sensor can monitor the water temperature and liquid level, and adjust the temperature and water level of the water in the water tank according to different working conditions. The water flow rate of the water inlet, overflow and outlet of the water tank is used to coordinate the adjustment. All valves of the test bench are remote electronically controlled regulating valves. The lower body of the outboard motor assembly can use its own water suction pump to suck water from the water tank to fully cool the lower body, which greatly simulates the working environment of the lower body underwater.

[0019] 6. The present invention is a non-standard structure and can be customized according to the size of the whole machine. It has a simple structure and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a side cross-sectional view of the present invention;

[0022] Figure 3 It is an enlarged cross-sectional view of the water seal connection system of the present invention.

[0023] Among them, 1. bracket, 2. flexible block, 3. propeller output shaft, 4. outboard motor assembly, 5. transition sleeve, 6. movable sealing sleeve, 7. fixed sleeve, 8. guide rail, 9. elastic coupling, 10. transition shaft, 11. dynamometer, 12. back plate, 13. water tank, 14. water seal sleeve, 15. bearing, 16. universal shaft, 17. water temperature and level sensor, 18. compressed air inlet, 19. compressed air outlet, 20. overflow, 21. water inlet, 22. water outlet. DETAILED DESCRIPTION

[0024] The present invention is an outboard motor assembly performance test device developed to address the problems of high centering accuracy requirements, limited transmission shaft centering position, and poor test stand stability and reliability of outboard motor assembly test devices. The present invention simulates the operating environment of an outboard motor in water, and its lower device can utilize its own water suction pump to draw water from a water tank to fully cool the lower device, thereby simulating the working environment of the lower device underwater to the greatest extent.

[0025] The following is combined with Figures 1 to 3 The present invention is described in further detail:

[0026] An outboard motor assembly performance test bench comprises a test bracket, a dynamometer 11 for testing the performance of the outboard motor assembly, an outboard motor assembly fixing device and a connecting water seal system between the outboard motor assembly 4 and the test bracket; the outboard motor assembly 4 is mounted on the outboard motor assembly fixing device, and the output shaft 3 of the outboard motor propeller is connected to the dynamometer 11 through a transmission shaft passing through the connecting water seal system; the connecting water seal system comprises a fixed sleeve 7 which is locked with a water seal sleeve 14 and sleeved on the outside of a universal shaft 16, a movable sealing sleeve 6 which is arranged outside the fixed sleeve 7 and locked with a transition sleeve 5 by a clamp, a transition sleeve 5 fixedly mounted on the output shaft 3 of the outboard motor propeller, and a universal shaft 16 connected to the transition shaft 10 and the transition sleeve 5; a guide rail 8 is also arranged on the water seal sleeve 14, and the movable sealing sleeve 6 can slide on the fixed sleeve 7 along the guide rail 8; the propeller output shaft 3 and the transition sleeve 5 are on the same axis. The transmission shaft includes a transition shaft 10 and a universal shaft 16, and a connecting flange on one side of the universal shaft 16 is fixedly mounted on the transition shaft 10. The designed water seal structure, the water seal sleeve 14,

[0027] The fixed sleeve 7, the movable sealing sleeve 6 and the transition sleeve 5 form a closed environment, thereby preventing the universal shaft 16 from being damaged by being immersed in water.

[0028] The test bracket includes a water tank 13 arranged at the lower end of the bracket 1, a water seal sleeve 14 fixedly installed with the water tank 13, an elastic coupling 9 connected to the dynamometer 11 and fixed with the transition shaft 10, and a bearing 15 fixedly installed in the water seal sleeve 14; each time the outboard motor assembly 4 is raised or lowered from the stand, the elastic coupling 9, the transition shaft 10, the dynamometer 11, the water seal sleeve 14, and the bearing 15 are fixed.

[0029] The outboard motor assembly fixing device includes a bracket 1 with a flexible block provided at the contact part with the outboard motor, a flexible holding block 2 which locks the outboard motor assembly 4 together with the bracket 1, and a back plate 12 for suspending the outboard motor assembly 4; the flexible block is a flexible material such as a nylon block, and a flexible block is provided at the contact part of the whole machine. This upper and lower locking and flexible locking method has higher stability and reliability than other methods. According to the characteristics of the outboard motor assembly, a three-dimensional bracket is designed from top to bottom for fixing, and flexible blocks are provided at the contact parts of the bracket 1 and the flexible holding block 2 with the outboard motor assembly, which solves the problem of loose support of the test bench caused by the violent swing of the outboard motor assembly during startup and high speed and high load, and increases the stability and reliability of the test bench. Since the connection between the tester 11 and the water tank 13 is a fixed connection and passes through the water seal sleeve 14, it not only avoids the problem of the water tank 13 limiting the shaft when the transition shaft 10 is directly aligned with the propeller output shaft 3, but also avoids water leakage from the water tank 13.

[0030] The water seal sleeve 14 is also provided with a compressed air inlet 18 and a compressed air outlet 19. The access of compressed air prevents water from entering the entire water seal system after the water seal sleeve 14 leaks. Once the seal fails, the compressed air can blow the water out of the water seal system in time and detect the leak in time.

[0031] The water tank 13 is provided with an overflow port 20, a water inlet 21 and a water outlet 22. The water flow rate of the water inlet 21, the overflow port 20 and the water outlet 22 is coordinated for regulation. All valves of the test bench are remotely controlled regulating valves.

[0032] A water temperature and liquid level sensor 17 for testing water temperature is also provided in the water tank 13, which can monitor the water temperature and liquid level and adjust the temperature and water level of the water in the water tank according to different working conditions.

[0033] Specific:

[0034] Test bracket part: the water seal 14 is fixed with the water tank 13, the elastic coupling 9 is fixed with the transition shaft 10, the bearing 15 is fixed in the water seal 14, and the above parts are aligned according to the technical requirements when the elastic coupling 9 is connected with the dynamometer 11. The above parts are manufactured and installed together with the outboard motor assembly stand. Every time the outboard motor assembly is put on and off the stand, the elastic coupling 9, the transition shaft 10, the dynamometer 11, the water seal 14, and the bearing 15 are fixed, and these parts only need to be inspected for alignment after a period of time.

[0035] Fixing of outboard motor assembly: Before the test, hoist the outboard motor assembly onto the test bench, hang the outboard motor assembly onto the back plate 12 to keep it in a free state, first fix the transition sleeve 5 onto the outboard motor propeller output shaft 3, at which point the transition sleeve 5 and the propeller output shaft 3 are on the same axis; then fix the dial indicator rod onto the water seal sleeve 14 to align the bearing 15. Since the universal joint 16 is used for connection in the later stage, the centering accuracy requirement is lower than that of other connection methods, and it is easier to center and align. After the centering is completed, the outboard motor assembly is locked using the bracket 1 and the flexible block 2, and flexible blocks are provided at the contact parts of the bracket 1 and the flexible block 2 with the outboard motor assembly. This upper and lower locking and flexible locking method has higher stability and reliability than other methods.

[0036] The outboard motor assembly is connected to the test bench: fix the connection flange on one side of the universal shaft 16 to the transition shaft 10, then put the fixed sleeve 7 on the outside of the universal shaft 16, and lock the fixed sleeve 7 with the water seal sleeve 14. Lock the guide rail 8 to the water seal sleeve 14, and the universal shaft 16 can slide along the guide rail 8 on the fixed sleeve 7, so that the movable sealing sleeve 6 retreats to one end close to the water seal sleeve 14, exposing the connection flange on the side of the universal shaft 16 close to the transition sleeve 5; after the universal shaft 16 is connected and locked with the transition sleeve 5, push the movable sealing sleeve 6 to contact with the transition sleeve 5, and use a clamp to lock the movable sealing sleeve 6 with the transition sleeve 5; after the connection is completed, connect the compressed air inlet and outlet, and the access of compressed air prevents water from entering the entire water seal system after the water seal sleeve 14 leaks; once the seal fails, the compressed air can blow the water out of the water seal system in time, and the leakage can be discovered in time.

[0037] When the outboard motor is running, the transition sleeve 5 is fixedly installed on the propeller output shaft 3. The propeller output shaft 3 drives the universal shaft 16 to rotate through the bearing in the transition sleeve 5. The universal shaft 16 is connected with the transition shaft 10 and rotates through the bearing in the water seal sleeve 14. The elastic coupling 9 rotates with the transition shaft 10. Since the elastic coupling 9 is fixed together with the dynamometer 11, the power is output to the dynamometer 11 for testing.

[0038] After the test bracket, the outboard motor assembly 4, the dynamometer 11, the outboard motor assembly fixing device and the connecting device of the outboard motor assembly 4 and the test bench are connected, the temperature of the water in the water tank 13 can be adjusted by the water temperature and liquid level sensor 17 according to the requirements of the test conditions, and the height of the water level in the water tank 13 can be adjusted by the water inlet 21, the overflow port 20 and the water outlet 22, and then the comprehensive performance test of the outboard motor assembly can be carried out.

[0039] Practical application: The present invention has been produced and has participated in the comprehensive performance test of the outboard motor assembly, and the use is good.

[0040] In summary, the present invention avoids the long-term immersion of the transmission shaft between the propeller output shaft and the dynamometer in water by designing a complete water seal system, using a universal shaft connection and adopting a three-dimensional flexible fastening scheme for the outboard motor assembly, greatly reduces the requirement for alignment, and eliminates the limitation of the transition shaft by the water tank when the dynamometer and the propeller output shaft are aligned and pass through the water tank; effectively solves the problems of high alignment accuracy requirements of the outboard motor assembly test bench, limited centering position of the transmission shaft, poor stability and reliability of the bench, and solves the problem of easy fatigue fracture of the propeller shaft due to high alignment requirements of the outboard motor assembly test.

Claims

1. An outboard motor assembly performance test bench, comprising a test bracket, a dynamometer (11) for testing the performance of the outboard motor assembly, an outboard motor assembly fixing device, and a water seal system for connecting the outboard motor assembly (4) and the test bracket; characterized in that: The outboard motor assembly (4) is mounted on the outboard motor assembly fixing device, and the outboard motor propeller output shaft (3) is connected to the dynamometer (11) through a transmission shaft passing through a connecting water seal system; the transmission shaft comprises a transition shaft (10) and a universal shaft (16), and a connecting flange on one side of the universal shaft (16) is fixedly mounted on the transition shaft (10); the connecting water seal system comprises a fixed sleeve (7) which is locked with a water seal sleeve (14) and sleeved on the outside of the universal shaft (16), and a fixed sleeve (7) which is arranged outside the fixed sleeve (7) and is locked with the transition shaft sleeve (5) by a clamp. A movable sealing sleeve (6), a transition sleeve (5) fixedly mounted on an outboard propeller output shaft (3), and a universal shaft (16) with two ends respectively connected to the transition shaft (10) and the transition sleeve (5); a guide rail (8) is also provided on the water seal sleeve (14), and the movable sealing sleeve (6) can slide on the fixed sleeve (7) along the guide rail (8); the propeller output shaft (3) and the transition sleeve (5) are on the same axis; the water seal sleeve (14) is also provided with a compressed air inlet (18) and a compressed air outlet (19); The test stand comprises a water tank (13) arranged at the lower end of the stand (1), a water seal (14) fixedly mounted on the water tank (13), an elastic coupling (9) connected to the dynamometer (11) and fixedly mounted on the transition shaft (10), and a bearing (15) fixedly mounted in the water seal (14); each time the outboard motor assembly (4) is moved up and down the test stand, the elastic coupling (9), the transition shaft (10), the dynamometer (11), the water seal (14) and the bearing (15) are fixedly mounted; The outboard motor assembly fixing device comprises a bracket (1) having a flexible block provided at a portion in contact with the outboard motor, a flexible holding block (2) which is assembled with the bracket (1) to lock the outboard motor assembly (4), and a back plate (12) for suspending the outboard motor assembly (4).

2. The outboard motor assembly performance test bench according to claim 1, characterized in that: The water tank (13) is provided with an overflow port (20), a water inlet (21) and a water outlet (22).

3. The outboard motor assembly performance test bench according to claim 1, characterized in that: A water temperature and liquid level sensor (17) for testing the water temperature is also provided in the water tank (13).

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