Engine bench test centering bracket and use method

Abstract

The present invention discloses an engine bench test centering bracket part and a use method thereof, comprising a centering bracket part, wherein the centering bracket part comprises a first horizontal hanging plate, a second horizontal hanging plate, a third vertical hanging plate and a fourth vertical positioning plate, wherein the first horizontal hanging plate is rectangular, the rectangular hanging plate is provided with a vertical positioning threaded through hole, a first positioning copper sleeve is correspondingly provided with the positioning threaded through hole, a first dial indicator is connected to the thread of the first positioning copper sleeve, the first horizontal hanging plate is provided with a fixing bolt hole, and the fixing bolt hole is connected to the U-shaped groove of the second horizontal hanging plate through a connecting bolt. The engine bench test centering bracket part and the use method thereof can accurately measure the coaxiality of an inclined high-elastic support high-speed engine and a hydraulic dynamometer, the groove on the U-shaped base root can be adjusted to a suitable position according to engine gear ring housings of different circumferences, is suitable for different gear ring housing models, and improves the scope of application.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to an engine bench test centering bracket part and a use method thereof. Background Art

[0002] In the field of engine manufacturing, the engine performance test procedure requires the alignment of the engine and the dynamometer. To ensure that the coaxiality of the axis of the engine and the dynamometer is within the allowable tolerance range, the axial clearance of the engine must be measured. If the alignment does not meet the requirements, it must be adjusted in time. In traditional alignment operations, the support surface of the engine support feet is horizontal. The engine is adjusted "up and down" in the vertical direction and "left and right" in the horizontal direction by the top screws on the support feet, or a support gasket is added to the vibration isolator support of the engine body to complete the alignment. When connecting, it is necessary to ensure that the concentricity of the two axes of the engine and the dynamometer is within the allowable tolerance range, so that the crankshaft of the engine and the rotor of the hydraulic dynamometer are kept in a straight line. The alignment requirements for the engine and the hydraulic dynamometer with soft connection and elastic support are even more stringent. For the engine, it is not only limited by volume and weight, but also the rubber vibration isolator will creep and settle under the heavy pressure of the engine. The operation is complicated, the labor intensity of the workers is high, the work efficiency is low, the accuracy of the alignment is difficult, and the cost is high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide an engine bench test centering bracket and a method of use, so that the alignment between the engine and the hydraulic dynamometer during the engine test process is more efficient and accurate, the operating steps are reduced, the labor intensity of workers is reduced, and the cost is reduced, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an engine bench test centering bracket part, including a centering bracket part, the centering bracket part including a first horizontal hanging plate, a second horizontal hanging plate, a third vertical hanging plate, and a fourth vertical positioning plate, the first horizontal hanging plate is rectangular, the rectangular hanging plate is provided with a vertical positioning threaded through hole, the positioning threaded through hole is correspondingly provided with a first positioning copper sleeve, the first positioning copper sleeve is threadedly connected with a first dial indicator, the first horizontal hanging plate is provided with a fixing bolt hole, the fixing bolt hole is connected to the U-shaped groove of the second horizontal hanging plate through a connecting bolt, and is fixed by tightening a nut, the first horizontal hanging plate is fixedly connected with a vertical hanging plate, the vertical hanging plate is provided with a vertical positioning threaded hole, the positioning threaded hole is correspondingly provided with a second positioning copper sleeve, the second positioning copper sleeve is threadedly connected with a second dial indicator, the vertical positioning plate is parallel to the vertical hanging plate, and the vertical positioning plate, the fixing frame and the second horizontal hanging plate form a right triangle structure.

[0005] As a preferred technical solution of the present invention, the first positioning copper sleeve is provided with an external thread and an internal thread, the external thread of the first positioning copper sleeve is threadedly connected to the threaded through hole, and the internal thread of the first positioning copper sleeve is threadedly connected to the first dial indicator.

[0006] As a preferred technical solution of the present invention, the second positioning copper sleeve has external threads and internal threads, the external threads of the second positioning copper sleeve are connected to the positioning threaded hole, and the internal threads of the second positioning copper sleeve are connected to the second dial indicator thread.

[0007] As a preferred technical solution of the present invention, the vertical positioning plate is designed with a U-shaped base.

[0008] As a preferred technical solution of the present invention, a fixing frame is arranged between the second horizontal hanging plate and the vertical positioning plate.

[0009] As a preferred technical solution of the present invention, it also includes an installation bracket part, which includes a hydraulic dynamometer, a high-elastic coupling, a transition plate and an elastic damping coupling. The hydraulic dynamometer is connected to the high-elastic coupling by a fourth bolt, and a transition plate is provided on the high-elastic coupling. The transition plate is connected to the elastic damping coupling with a third bolt.

[0010] As a preferred technical solution of the present invention, the hydraulic dynamometer is connected to the engine crankshaft via a highly elastic coupling.

[0011] As a preferred technical solution of the present invention, the elastic damping coupling is fixedly connected to the gear housing by a first bolt.

[0012] As a preferred technical solution of the present invention, the end surface of the input flange of the hydraulic dynamometer is fixedly connected to the U-shaped base through connecting bolts.

[0013] A method for using a centering bracket for an engine bench test, the steps of which are as follows:

[0014] S1: Connect the bolts to fix the U-shaped base to the end face of the hydraulic dynamometer input flange and enter S2;

[0015] S2: The U-shaped base can be adjusted up and down according to the size of the engine gear ring housing, and the centering bracket is adjusted to a height that matches the engine gear ring housing, and then enter S3;

[0016] S3: The hydraulic dynamometer drives the engine crankshaft to rotate, the gear ring housing remains stationary, the hydraulic dynamometer rotates and drives the centering bracket to rotate, the first dial indicator pointer and the second dial indicator pointer on the centering bracket respectively pass a circle on the end face and the circumferential face of the gear ring housing, and then enter S4;

[0017] S4: Observe the values ​​of the dial indicators in the upper, lower, left and right directions on the centering bracket. If the values ​​of the dial indicators in the upper, lower, left and right directions vary within a range of 0-0.3mm, proceed to S7. If the difference between the measured values ​​of the dial indicators in the upper and lower directions is greater than 0.30mm, and the values ​​of the dial indicators in the left and right directions vary within a range of 0-0.3mm, proceed to S5. If the values ​​of the dial indicators in the upper and lower directions vary within a range of 0-0.3mm, and the values ​​of the dial indicators in the left and right directions vary within a range of 0.30mm, proceed to S6.

[0018] S5: Reduce the difference in the vertical direction by adding or removing shims to adjust the height of the engine axis on the external engine support frame until the difference measured in the up and down directions is 0-0.3mm, and enter S7;

[0019] S6: Reduce the difference by adjusting the relative horizontal position of the engine through the external engine top screw block until the difference measured in the left and right directions is 0-0.3mm, and enter S7;

[0020] S7: Work completed.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the engine bench test centering bracket part and the use method can accurately measure the coaxiality of the inclined high-elastic support high-speed engine and the hydraulic dynamometer, and the groove on the U-shaped base root can be adjusted to a suitable position according to the engine ring gear housing with different circumferences, which is suitable for different ring gear housing models, thereby improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the working of the present invention;

[0024] Figure 3 It is a schematic diagram of the process of the present invention.

[0025] In the figure: 1 first horizontal hanging plate, 2 second horizontal hanging plate, 3 vertical hanging plate, 4 vertical positioning plate, 5 fixing frame, 6 first bolt, 7 threaded through hole, 8 positioning copper sleeve, 9 first dial indicator, 10 U-shaped groove, 11 bolt hole, 12 second bolt, 13 tightening nut, 14 threaded hole, 15 copper sleeve, 16 second dial indicator, 17 U-shaped base root, 18 third bolt, 19 fourth bolt, 20 connecting bolt, 21 hydraulic dynamometer, 22 gear ring housing, 23 engine crankshaft, 25 high elastic coupling, 26 transition plate, 27 elastic damping coupling. DETAILED DESCRIPTION

[0026] 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.

[0027] Embodiment 1: An engine bench test centering bracket part, including a centering bracket part 24, the centering bracket part 24 includes a first horizontal hanging plate 1, a second horizontal hanging plate 2, a third vertical hanging plate 3 and a fourth vertical positioning plate 4, a fixing frame 5 is arranged between the second horizontal hanging plate 2 and the vertical positioning plate 4, the fixing frame 5 is used to improve the structural strength of the device, the vertical positioning plate 4 is designed with a U-shaped base root 17, the semi-U-shaped base root 17 is used to adjust the installation height in the vertical direction, and the circumference measurement of the ring gear housing 22 of engines with different specifications can be realized, the first horizontal hanging plate 1 is rectangular, and the rectangular hanging plate is provided with a vertical positioning threaded through hole 7, and the positioning threaded through hole 7 is correspondingly provided A first positioning copper sleeve 8 is provided, and the first positioning copper sleeve 8 is threadedly connected with a first dial indicator 9. The first positioning copper sleeve 8 is provided with an external thread and an internal thread. The external thread of the first positioning copper sleeve 8 is threadedly connected with the threaded through hole 7, and the internal thread of the first positioning copper sleeve 8 is threadedly connected with the first dial indicator 9. The first dial indicator 9 is used to measure the radial clearance of the gear ring housing 22. The first horizontal hanging plate 1 is provided with a fixing bolt hole 11, and the fixing bolt hole 11 is connected to the U-shaped groove 10 of the second horizontal hanging plate 2 through a connecting bolt 12. The U-shaped groove 10 is used to adjust the axial distance and is fixed by tightening the nut 13. The first horizontal hanging plate 1 is fixedly connected with a vertical hanging plate 3, the vertical hanging plate 3 is provided with a vertical positioning threaded hole 14, the positioning threaded hole 14 is correspondingly provided with a second positioning copper sleeve 15, the second positioning copper sleeve 15 has an external thread and an internal thread, the external thread of the second positioning copper sleeve 15 is connected to the positioning threaded hole 14, the internal thread of the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the vertical positioning plate 4 is parallel to the vertical hanging plate 3, the vertical positioning plate 4 and the fixing frame 5 and the second horizontal hanging plate 2 form a right triangle structure, and also include a mounting bracket part, the mounting bracket part includes a hydraulic dynamometer 21, a high elastic coupling 25, a transition The hydraulic dynamometer 21 is connected to the high-elastic coupling 25 through a fourth bolt 19, a transition plate 26 is arranged on the high-elastic coupling 25, and the transition plate 26 is connected to the elastic damping coupling 27 with a third bolt 18. The hydraulic dynamometer 21 is connected to the engine crankshaft 23 through the high-elastic coupling 25, and the elastic damping coupling 27 is fixedly connected to the gear housing 22 through a first bolt 6. The end face of the input flange of the hydraulic dynamometer 21 is fixedly connected to the U-shaped base root 17 through a connecting bolt 20. The device is easy to use, low in cost, can meet the centering measurement requirements of different series of high-speed engines, and has high accuracy.

[0028] The steps for using the device are as follows:

[0029] S1: The connecting bolts 20 fix the U-shaped base 17 to the end surface of the input flange of the hydraulic dynamometer 21;

[0030] S2: The U-shaped base root 17 can be adjusted up and down in height according to the size of the engine ring gear housing 22;

[0031] S3: The hydraulic dynamometer 21 is driven to drive the engine crankshaft 23 to rotate, the gear ring housing 22 remains stationary, the hydraulic dynamometer 21 rotates to drive the centering bracket 24 to rotate, and the pointers of the first dial indicator 9 and the second dial indicator 16 on the centering bracket 24 respectively pass a circle on the end surface and the circumferential surface of the gear ring housing 22;

[0032] S4: Observe the values ​​of the dial indicators in the four directions of the flywheel when turning. If the values ​​of the dial indicators in the four directions of the flywheel change within the range of 0-0.3mm, enter S7;

[0033] S7: Work completed.

[0034] Embodiment 2: An engine bench test centering bracket part, including a centering bracket part 24, the centering bracket part 24 includes a first horizontal hanging plate 1, a second horizontal hanging plate 2, a third vertical hanging plate 3 and a fourth vertical positioning plate 4, a fixing frame 5 is arranged between the second horizontal hanging plate 2 and the vertical positioning plate 4, the fixing frame 5 is used to improve the structural strength of the device, the vertical positioning plate 4 is designed with a U-shaped base root 17, the semi-U-shaped base root 17 is used to adjust the installation height in the vertical direction, and the circumference measurement of the ring gear housing 22 of engines with different specifications can be realized, the first horizontal hanging plate 1 is rectangular, and the rectangular hanging plate is provided with a vertical positioning threaded through hole 7, and the positioning threaded through hole 7 is correspondingly provided A first positioning copper sleeve 8 is provided, and the first positioning copper sleeve 8 is threadedly connected with a first dial indicator 9. The first positioning copper sleeve 8 is provided with an external thread and an internal thread. The external thread of the first positioning copper sleeve 8 is threadedly connected with the threaded through hole 7, and the internal thread of the first positioning copper sleeve 8 is threadedly connected with the first dial indicator 9. The first dial indicator 9 is used to measure the radial clearance of the gear ring housing 22. The first horizontal hanging plate 1 is provided with a fixing bolt hole 11, and the fixing bolt hole 11 is connected to the U-shaped groove 10 of the second horizontal hanging plate 2 through a connecting bolt 12. The U-shaped groove 10 is used to adjust the axial distance and is fixed by tightening the nut 13. The first horizontal hanging plate 1 is fixedly connected with a vertical hanging plate 3, the vertical hanging plate 3 is provided with a vertical positioning threaded hole 14, the positioning threaded hole 14 is correspondingly provided with a second positioning copper sleeve 15, the second positioning copper sleeve 15 has an external thread and an internal thread, the external thread of the second positioning copper sleeve 15 is connected to the positioning threaded hole 14, the internal thread of the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the vertical positioning plate 4 is parallel to the vertical hanging plate 3, the vertical positioning plate 4 and the fixing frame 5 and the second horizontal hanging plate 2 form a right triangle structure, and also include a mounting bracket part, the mounting bracket part includes a hydraulic dynamometer 21, a high elastic coupling 25, a transition The hydraulic dynamometer 21 is connected to the high-elastic coupling 25 through a fourth bolt 19, a transition plate 26 is arranged on the high-elastic coupling 25, and the transition plate 26 is connected to the elastic damping coupling 27 with a third bolt 18. The hydraulic dynamometer 21 is connected to the engine crankshaft 23 through the high-elastic coupling 25, and the elastic damping coupling 27 is fixedly connected to the gear housing 22 through a first bolt 6. The end face of the input flange of the hydraulic dynamometer 21 is fixedly connected to the U-shaped base root 17 through a connecting bolt 20. The device is easy to use, low in cost, can meet the centering measurement requirements of different series of high-speed engines, and has high accuracy.

[0035] The steps for using the device are as follows:

[0036] S1: The connecting bolts 20 fix the U-shaped base 17 to the end surface of the input flange of the hydraulic dynamometer 21;

[0037] S2: The U-shaped base root 17 can be adjusted up and down in height according to the size of the engine ring gear housing 22;

[0038] S3: The hydraulic dynamometer 21 is driven to drive the engine crankshaft 23 to rotate, the gear ring housing 22 remains stationary, the hydraulic dynamometer 21 rotates to drive the centering bracket 24 to rotate, and the pointers of the first dial indicator 9 and the second dial indicator 16 on the centering bracket 24 respectively pass a circle on the end surface and the circumferential surface of the gear ring housing 22;

[0039] S4: Observe the values ​​of the dial indicators in the upper, lower, left and right directions on the centering bracket 24. If the difference between the measured values ​​of the dial indicators in the upper and lower directions is greater than 0.30 mm, and the value variation range of the dial indicator in the left and right directions is 0-0.3 mm, enter S5;

[0040] S5: Reduce the difference in the vertical direction by adding or removing shims to adjust the height of the engine axis on the external engine support frame until the difference measured in the up and down directions is 0-0.3mm, and enter S7;

[0041] S7: Work completed.

[0042] Embodiment 3: An engine bench test centering bracket part, including a centering bracket part 24, the centering bracket part 24 includes a first horizontal hanging plate 1, a second horizontal hanging plate 2, a third vertical hanging plate 3 and a fourth vertical positioning plate 4, a fixing frame 5 is arranged between the second horizontal hanging plate 2 and the vertical positioning plate 4, the fixing frame 5 is used to improve the structural strength of the device, the vertical positioning plate 4 is designed with a U-shaped base root 17, the semi-U-shaped base root 17 is used to adjust the installation height in the vertical direction, and the circumference measurement of the ring gear housing 22 of engines with different specifications can be realized, the first horizontal hanging plate 1 is rectangular, and the rectangular hanging plate is provided with a vertical positioning threaded through hole 7, and the positioning threaded through hole 7 is correspondingly provided A first positioning copper sleeve 8 is provided, and the first positioning copper sleeve 8 is threadedly connected with a first dial indicator 9. The first positioning copper sleeve 8 is provided with an external thread and an internal thread. The external thread of the first positioning copper sleeve 8 is threadedly connected with the threaded through hole 7, and the internal thread of the first positioning copper sleeve 8 is threadedly connected with the first dial indicator 9. The first dial indicator 9 is used to measure the radial clearance of the gear ring housing 22. The first horizontal hanging plate 1 is provided with a fixing bolt hole 11, and the fixing bolt hole 11 is connected to the U-shaped groove 10 of the second horizontal hanging plate 2 through a connecting bolt 12. The U-shaped groove 10 is used to adjust the axial distance and is fixed by tightening the nut 13. The first horizontal hanging plate 1 is fixedly connected with a vertical hanging plate 3, the vertical hanging plate 3 is provided with a vertical positioning threaded hole 14, the positioning threaded hole 14 is correspondingly provided with a second positioning copper sleeve 15, the second positioning copper sleeve 15 has an external thread and an internal thread, the external thread of the second positioning copper sleeve 15 is connected to the positioning threaded hole 14, the internal thread of the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the second positioning copper sleeve 15 is threadedly connected to the second dial indicator 16, the vertical positioning plate 4 is parallel to the vertical hanging plate 3, the vertical positioning plate 4 and the fixing frame 5 and the second horizontal hanging plate 2 form a right triangle structure, and also include a mounting bracket part, the mounting bracket part includes a hydraulic dynamometer 21, a high elastic coupling 25, a transition The hydraulic dynamometer 21 is connected to the high-elastic coupling 25 through a fourth bolt 19, a transition plate 26 is arranged on the high-elastic coupling 25, and the transition plate 26 is connected to the elastic damping coupling 27 with a third bolt 18. The hydraulic dynamometer 21 is connected to the engine crankshaft 23 through the high-elastic coupling 25, and the elastic damping coupling 27 is fixedly connected to the gear housing 22 through a first bolt 6. The end face of the input flange of the hydraulic dynamometer 21 is fixedly connected to the U-shaped base root 17 through a connecting bolt 20. The device is easy to use, low in cost, can meet the centering measurement requirements of different series of high-speed engines, and has high accuracy.

[0043] The steps for using the device are as follows:

[0044] S1: The connecting bolts 20 fix the U-shaped base 17 to the end surface of the input flange of the hydraulic dynamometer 21;

[0045] S2: The U-shaped base root 17 can be adjusted up and down in height according to the size of the engine ring gear housing 22;

[0046] S3: The hydraulic dynamometer 21 is driven to drive the engine crankshaft 23 to rotate, the gear ring housing 22 remains stationary, the hydraulic dynamometer 21 rotates to drive the centering bracket 24 to rotate, and the pointers of the first dial gauge 9 and the second dial gauge 16 on the centering bracket 24 respectively pass a circle on the end surface and the circumferential surface of the gear ring housing 22;

[0047] S4: Observe the values ​​of the dial indicators in the upper, lower, left and right directions on the centering bracket 24. If the value of the dial indicator in the upper and lower directions varies within a range of 0-0.3 mm and the difference between the measured values ​​of the dial indicators in the left and right directions is greater than 0.30 mm, enter S6;

[0048] S6: Reduce the difference by adjusting the relative horizontal position of the engine through the external engine top screw block until the difference measured in the left and right directions is 0-0.3mm, and enter S7;

[0049] S7: Work completed.

[0050] The present invention accurately measures the centering clearance between the engine and the axis of the hydraulic dynamometer 21, is easy to use, has low cost, and has a reasonable structure. It greatly reduces the labor intensity and labor time of workers in checking the coaxiality of the hydraulic dynamometer 21 and the engine shaft system, improves work efficiency, and can meet the centering measurement requirements of different series of high-speed engines. It has high accuracy and improves the scope of application.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engine bench test centering bracket, comprising a centering bracket (24), characterized in that: The centering bracket part (24) comprises a first horizontal hanging plate (1), a second horizontal hanging plate (2), a third vertical hanging plate (3), and a fourth vertical positioning plate (4); the first horizontal hanging plate (1) is rectangular, and the rectangular hanging plate is provided with a vertical positioning threaded through hole (7); a first positioning copper sleeve (8) is provided corresponding to the positioning threaded through hole (7); the first positioning copper sleeve (8) is threadedly connected to a first dial indicator (9); the first horizontal hanging plate (1) is provided with a fixing bolt hole (11), and the fixing bolt hole (11) is connected to the second horizontal hanging plate (1) by a second bolt (12). The first horizontal hanging plate (1) is connected to the U-shaped groove (10) of the hanging plate (2) and is fixed by tightening the nut (13); the first horizontal hanging plate (1) is fixedly connected to the vertical hanging plate (3); the vertical hanging plate (3) is provided with a vertical positioning threaded hole (14); a second positioning copper sleeve (15) is correspondingly provided to the positioning threaded hole (14); the second positioning copper sleeve (15) is threadedly connected to a second dial indicator (16); the vertical positioning plate (4) is parallel to the vertical hanging plate (3); the vertical positioning plate (4) forms a right triangle structure with the fixing frame (5) and the second horizontal hanging plate (2); The vertical positioning plate (4) is designed with a U-shaped base (17); The invention also comprises a mounting bracket part, wherein the mounting bracket part comprises a hydraulic dynamometer (21), a highly elastic coupling (25), a transition plate (26) and an elastic damping coupling (27); the hydraulic dynamometer (21) is connected to the highly elastic coupling (25) via a fourth bolt (19); a transition plate (26) is arranged on the highly elastic coupling (25); and the transition plate (26) is connected to the elastic damping coupling (27) via a third bolt (18).

2. The engine bench test centering bracket according to claim 1, characterized in that: The first positioning copper sleeve (8) is provided with an external thread and an internal thread, the external thread of the first positioning copper sleeve (8) is threadedly connected to the threaded through hole (7), and the internal thread of the first positioning copper sleeve (8) is threadedly connected to the first dial indicator (9).

3. The engine bench test centering bracket according to claim 1, characterized in that: The second positioning copper sleeve (15) has an external thread and an internal thread. The external thread of the second positioning copper sleeve (15) is connected to the positioning threaded hole (14), and the internal thread of the second positioning copper sleeve (15) is threadedly connected to the second dial indicator (16).

4. The engine bench test centering bracket according to claim 1, characterized in that: A fixing frame (5) is provided between the second horizontal hanging plate (2) and the vertical positioning plate (4).

5. The engine bench test centering bracket according to claim 1, characterized in that: The hydraulic dynamometer (21) is connected to the engine crankshaft (23) via a highly elastic coupling (25).

6. The engine bench test centering bracket according to claim 1, characterized in that: The elastic damping coupling (27) is fixedly connected to the gear housing (22) via a first bolt (6).

7. The engine bench test centering bracket according to claim 1, characterized in that: The end surface of the input flange of the hydraulic dynamometer (21) is fixedly connected to the U-shaped base (17) via connecting bolts (20).

8. A method for using the engine bench test centering bracket according to claim 1, characterized in that: The steps include: S1: Connecting bolts (20) to fix the U-shaped base (17) to the end surface of the input flange of the hydraulic dynamometer (21); S2: The U-shaped base (17) can be adjusted in height up and down according to the size of the engine gear ring housing (22), and the centering bracket (24) is adjusted to a height matching the engine gear ring housing (22), and then enter S3; S3: The hydraulic dynamometer (21) is driven to rotate the engine crankshaft (23), the gear ring housing (22) remains stationary, the hydraulic dynamometer (21) rotates to rotate the centering bracket (24), and the pointer of the first dial indicator (9) and the pointer of the second dial indicator (16) on the centering bracket (24) respectively travel a circle on the end surface and the circumferential surface of the gear ring housing (22); S4: Observe the values ​​of the dial indicators in the four directions of up, down, left and right on the centering bracket (24); if the values ​​of the dial indicators in the four directions are within the range of 0-0.3 mm, proceed to S7; if the difference between the measured values ​​of the dial indicators in the up and down directions is greater than 0.30 mm, and the value of the dial indicators in the left and right directions is within the range of 0-0.3 mm, proceed to S5; if the value of the dial indicators in the up and down directions is within the range of 0-0.3 mm, and the value of the dial indicators in the left and right directions is greater than 0.30 mm, proceed to S6; S5: Reduce the difference in the vertical direction by adding or removing shims to adjust the height of the engine axis on the external engine support frame until the difference in the vertical direction is 0-0.3mm, and enter S7; S6: Reduce the difference by adjusting the relative horizontal position of the engine through the external engine top screw block until the difference measured in the left and right directions is 0-0.3mm, and enter S7; S7: Work completed.

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