Flywheel housing shoulder radial runout measurement method

Abstract

The application relates to a flywheel shell stopper radial runout measuring method in the technical field of flywheel shell detection, which comprises the following steps: installing a crankshaft, a main bearing and other components in a body group on a turnover frame; rotating the turnover frame, adopting a stopper radial runout detection table to measure the first radial runout degree at the rear end of the crankshaft; taking the body group and the components thereon off the turnover frame, fixing the stopper radial runout detection table on the end face of a flywheel, vertically pointing the measuring rod of the stopper radial runout detection table at the six o'clock position of the flywheel shell stopper and adjusting zero; sequentially measuring the second radial runout degree, the third radial runout degree, the fourth radial runout degree and the fifth radial runout degree of the flywheel shell stopper; and calculating the flywheel shell stopper radial runout value according to the first radial runout degree, the second radial runout degree, the third radial runout degree and the fourth radial runout degree. The flywheel shell stopper radial runout measuring method reduces the detection error of the flywheel shell stopper radial runout value, is high in accuracy, and improves the numerical credibility.

Description

Technical Field

[0001] This application relates to the field of flywheel housing testing technology, and in particular to a method for measuring the radial runout of a flywheel housing stop. Background Technology

[0002] With the maturity of flywheel housing technology, the use of flywheel housings is becoming increasingly common. Flywheel housings are used in engines and other machinery to protect the flywheel. Each flywheel housing has a stop face. In the assembly process of the flywheel housing and flywheel, the runout of this stop face is crucial. Poor control of this dimensional tolerance can easily lead to excessive radial runout of the flywheel circumference, affecting its service life. Currently, the radial runout of the flywheel housing stop face is often measured directly using a dial indicator. The dial indicator is magnetically attached to the crankshaft end face or flywheel end face, and the crankshaft is manually rotated until the pointer reaches its lowest point, then zeroed. The radial runout value is then measured manually based on the pointer's swing range. However, this measurement method has a large detection error, and the numerical reliability is low. Summary of the Invention

[0003] In view of the problems existing in the background technology, this application provides a method for measuring the radial runout of the flywheel housing stop, which can reduce the detection error of the radial runout value of the flywheel housing stop, has high accuracy, and improves the reliability of the numerical value.

[0004] According to one aspect of the present invention, a method for measuring the radial runout of a flywheel housing stop is provided, applied to the radial runout measurement of the flywheel housing stop of an engine, the engine including an engine block assembly, the method comprising: mounting a crankshaft, main bearing, main bearing cap, flywheel, and flywheel housing onto the engine block assembly and placing it on a tilting frame; rotating the tilting frame and measuring a first radial runout at the rear end of the crankshaft using a radial runout tester; removing the engine block assembly along with its components from the tilting frame, and... The radial runout tester is fixed to the end face of the flywheel. The measuring rod of the radial runout tester is vertically pointed to the six o'clock position of the flywheel housing stop and zeroed. The second radial runout at the nine o'clock position, the third radial runout at the twelve o'clock position, the fourth radial runout at the three o'clock position, and the fifth radial runout at the six o'clock position are measured in sequence. The radial runout value of the flywheel housing stop is calculated based on the first, second, third, and fourth radial runout values.

[0005] In some embodiments of the present invention, determining the six o'clock position includes: pointing the measuring rod of the radial runout tester vertically near the six o'clock position of the flywheel housing stop; rotating the crankshaft and flywheel clockwise and counterclockwise by set rotation angles according to set step angles, collecting the readings of the radial runout tester at each set step angle, and identifying the angle corresponding to the minimum reading, which is the six o'clock position.

[0006] In some embodiments of the present invention, the set step angle is 0.05°-0.5°;

[0007] Preferably, the set step angle is 0.1°.

[0008] In some embodiments of the present invention, the set rotation angle is 2°-15°;

[0009] Preferably, the set rotation angle is 5°.

[0010] In some embodiments of the present invention, the radial runout test gauge is fixed at a position away from the crankshaft axis on the end face of the flywheel.

[0011] In some embodiments of the present invention, the measurement of the first radial runout includes: placing the engine block assembly and its components on a tilting frame, rotating the tilting frame for the first time so that the Z direction of the engine block assembly and its components coincides with the direction of gravity and the cylinder head mounting surface of the engine block assembly is facing upwards, and zeroing the measuring rod of the radial runout test gauge with its measuring rod pointing vertically to the crankshaft rear end journal; then rotating the tilting frame for the second time so that the Z direction of the engine block assembly and its components coincides with the direction of gravity and the cylinder head mounting surface of the engine block assembly is facing downwards, and collecting the reading of the radial runout test gauge, which is the first radial runout.

[0012] In some embodiments of the invention, the flywheel housing stop is further equipped with a connecting rod and a piston during radial runout measurement.

[0013] In some embodiments of the present invention, the fifth radial runout is less than or equal to 0.01 mm.

[0014] In some embodiments of the present invention, if the fifth radial runout is greater than 0.01 mm, the second, third, fourth, and fifth radial runouts are remeasured until the fifth radial runout is less than or equal to 0.01 mm.

[0015] In some embodiments of the present invention, the rotating tilting frame, as well as the rotating crankshaft and flywheel, are all driven by a drive motor, which is controlled by a host computer.

[0016] Compared with the prior art, the present invention achieves the following technical effects:

[0017] By using the radial runout measurement method of the flywheel housing stop in this technical solution, the first radial runout is measured using a rotating frame, which minimizes the influence of the radial clearance of the main bearing. The drive motor replaces manual rotation, and the control is achieved through a host computer. This enables precise control of the rotation speed and angle of the rotating frame, crankshaft, and flywheel, accurately finding the lowest point corresponding to the six o'clock position. The data of the first radial runout, the fifth radial runout at 6 o'clock, the second radial runout at 9 o'clock, the third radial runout at 12 o'clock, and the fourth radial runout at 3 o'clock are accurately recorded. The reading position angle error is extremely small. Based on this, the radial runout value of the flywheel housing stop is calculated. The numerical reliability is high, reducing the detection error of the radial runout value of the flywheel housing stop and improving the accuracy of the runout value. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is an overall flowchart of the method for measuring radial runout of the flywheel housing stop according to the embodiments of this application;

[0020] Figure 2 This is a detailed process diagram of the method for measuring the radial runout of the flywheel housing stop according to the embodiments of this application;

[0021] Figure 3 This is a structural diagram of the crankshaft radial runout measurement system;

[0022] Figure 4 This is a structural diagram for measuring the radial runout of the flywheel housing stop.

[0023] The labels in the attached diagram represent the following: 1. Main body assembly; 2. Flywheel; 3. Crankshaft; 4. Drive motor; 5. Host computer; 6. Tilting frame. Detailed Implementation

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0026] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0027] This application discloses a method for measuring the radial runout of a flywheel housing stop. This method is applied to the radial runout measurement of the flywheel housing stop in an engine. The engine includes an engine block assembly, crankshaft, main bearing, main bearing cap, flywheel, flywheel housing, connecting rod, and piston. Figure 1 and Figure 2 As shown, the method for measuring the radial runout of the flywheel housing stop includes the following steps:

[0028] 1) Crankshaft radial runout measurement

[0029] like Figure 3 As shown, firstly, crankshaft 3, main bearing, main bearing cap, flywheel 2, flywheel housing, connecting rod and piston are installed on engine block assembly 1. Then, engine block assembly 1, together with its components, i.e. the engine as a whole, is placed on tilting frame 6. Specifically, by taking into account as much as possible the factors affecting the radial runout of the flywheel housing stop, especially the influence of the radial clearance of the main bearing, the accuracy of subsequent measurement of the radial runout value of the flywheel housing stop can be improved.

[0030] After placing the engine assembly on the tilting frame 6, firstly, rotate the tilting frame 6 to make the Z direction of the engine block assembly 1 and its components coincide with the direction of gravity and the cylinder head mounting surface of the engine block assembly 1 face upwards. Then, zero the measuring rod of the radial runout test gauge is pointed vertically to the rear end of the crankshaft 3 main journal.

[0031] Then, the flipping frame 6 is rotated for the second time so that the Z direction of the engine block assembly 1 and its components coincides with the direction of gravity and the cylinder head mounting surface of the engine block assembly 1 is facing downward. At this time, the reading of the radial runout test gauge is collected. This reading is the first radial runout E, that is, the crankshaft radial runout.

[0032] Specifically, the radial runout tester for the stop can be a dial indicator or a micrometer. In this embodiment, a dial indicator is used. The dial indicator includes a bezel, a long pointer, a short pointer, a dial, a rotation indicator, a measuring rod, and a measuring head. When the measuring rod is perpendicular to the main journal at the rear end of the crankshaft 3, the measuring head contacts the main journal.

[0033] In addition, in order to reduce the possibility of large measurement errors caused by manual rotation, a drive motor 4 is used when rotating the tilting frame 6. The drive motor 4 is controlled by the host computer 5 to achieve precise control of the rotation speed and angle of the tilting frame 6, and the host computer 5 collects the first radial runout.

[0034] 2) Measurement of radial runout of flywheel housing stop

[0035] like Figure 4 As shown, after completing the measurement of the first radial runout, the body assembly 1 and its components are removed from the flipping frame 6. Then, the radial runout test gauge is fixed to the end face of the flywheel 2, and the radial runout test gauge is fixed to the end face of the flywheel 2 at a position away from the axis of the crankshaft 3, that is, as far away from the rotation center as possible.

[0036] Next, position the measuring rod of the radial runout test gauge vertically at the six o'clock position on the flywheel housing stop and zero it. It should be noted that this six o'clock position is not an absolute six o'clock position; it is determined using the following method:

[0037] First, position the measuring rod of the radial runout tester vertically near the six o'clock position of the flywheel housing stop. Then, according to the set step angle, rotate the crankshaft 3 and flywheel 2 clockwise and counterclockwise by the set rotation angles respectively, and collect the reading t of the radial runout tester at each set step angle. Identify the angle α1 corresponding to the minimum reading t.

[0038] Then, point the measuring rod of the radial runout tester vertically near the six o'clock position of the flywheel housing stop again. Then, according to the set step angle, rotate the crankshaft 3 and flywheel 2 clockwise and counterclockwise by the set rotation angles respectively, collect the reading t of the radial runout tester at each set step angle, and identify the angle α2 corresponding to the minimum reading t.

[0039] When |α1-α2| < 0.1°, the measured data is considered valid, and angle α1 is the six o'clock position; if the value of |α1-α2| is greater than 0.1°, then measure angles α1 and α2 again until the value of |α1-α2| is within the required range, and the six o'clock position is determined.

[0040] Specifically, the set step angle is 0.05°-0.5°, preferably 0.1°, and the set rotation angle is 2°-15°, preferably 5°.

[0041] It should be noted that the required ranges for |α1-α2|, step angle, and rotation angle can be set according to the accuracy requirements of the measured radial runout of the engine flywheel housing stop. It is understood that setting the parameters to a smaller value can improve the control of accuracy, but it will also increase the measurement workload. For example, when the accuracy requirement of the measured radial runout of the engine flywheel housing stop is low, the upper limit of the value of |α1-α2| can be increased accordingly to reduce the measurement workload while meeting the measurement requirements. For example, |α1-α2| is less than or equal to 0.2°, 0.3°, or 0.4°, etc. Therefore, it can be set according to specific needs and is not limited to the range given in this embodiment.

[0042] After determining the six o'clock position, rotate crankshaft 3 and flywheel 2 to angle α1, and zero the radial runout gauge, recording it as A', A' = 0; then rotate crankshaft 3 and flywheel 2 clockwise, and measure the second radial runout D at the nine o'clock position, the third radial runout C at the twelve o'clock position, the fourth radial runout B at the three o'clock position, and the fifth radial runout A at the six o'clock position in sequence.

[0043] When |A-A'|≤0.01mm, the measurement data is considered valid. If the fifth radial runout A is greater than 0.01mm, the crankshaft 3 and flywheel 2 are rotated back to angle α1, and the radial runout tester is zeroed. Then, the second radial runout D, the third radial runout C, the fourth radial runout B, and the fifth radial runout A are measured again until the fifth radial runout A is less than or equal to 0.01mm.

[0044] It should be noted that the required range of |A-A'| can be set according to the accuracy requirements of the measured radial runout of the engine flywheel housing stop. For example, when the accuracy requirements of the measured radial runout of the engine flywheel housing stop are low, the upper limit of the value of |A-A'| can be increased accordingly to reduce the workload of measurement while meeting the measurement requirements. For example, |A-A'| is less than or equal to 0.02mm, 0.04mm or 0.06mm, etc., and is not limited to the range given in this embodiment.

[0045] Similarly, to reduce the possibility of large measurement errors caused by manual rotation, a drive motor 4 is used when rotating the crankshaft 3 and flywheel 2. The drive motor 4 is controlled by the host computer 5 to achieve precise control of the rotation speed and angle of the crankshaft 3 and flywheel 2. The host computer 5 collects the reading t of the radial runout detection table at each set step angle and the corresponding angle α, and identifies the angle α1 or angle α2 corresponding to the minimum reading t. The host computer 5 collects the second radial runout D, the third radial runout C, the fourth radial runout B and the fifth radial runout A, and determines whether the fifth radial runout A is within the set threshold range.

[0046] 3) Calculation of radial runout value of flywheel housing stop

[0047] Based on the first radial runout, second radial runout, third radial runout, and fourth radial runout, according to the formula provided by the SAE standard, i.e.

[0048]

[0049] The radial runout value R of the flywheel housing stop can then be calculated.

[0050] By using the radial runout measurement method of the flywheel housing stop in this technical solution, the first radial runout is measured using the flipping frame 6, which minimizes the influence of the radial clearance of the main bearing. The drive motor 4 replaces manual rotation, and the control is achieved through the host computer 5. This enables precise control of the rotation speed and angle of the flipping frame 6, crankshaft 3, and flywheel 2, accurately finding the lowest point corresponding to the six o'clock position. The data of the first radial runout, the fifth radial runout at the six o'clock position, the second radial runout at the nine o'clock position, the third radial runout at the twelve o'clock position, and the fourth radial runout at the three o'clock position are accurately recorded. The reading position angle error is extremely small. Based on this, the radial runout value of the flywheel housing stop is calculated according to the formula provided by the SAE standard. The numerical reliability is high, reducing the detection error of the radial runout value of the flywheel housing stop and achieving high accuracy.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for measuring the radial runout of a flywheel housing stop, applied to the radial runout measurement of the flywheel housing stop in an engine, wherein the engine includes a block assembly, characterized in that, The method for measuring radial runout of the flywheel housing stop includes: The engine block assembly, after being fitted with the crankshaft, main bearing, main bearing cap, flywheel, and flywheel housing, is placed on a tilting frame. The crankshaft is rotated and the first radial runout at the rear end is measured using a radial runout tester. The measurement of the first radial runout includes: placing the engine block assembly and its components on the rotating frame; rotating the rotating frame for the first time so that the Z-direction of the engine block assembly and its components coincides with the direction of gravity and the cylinder head mounting surface of the engine block assembly is facing upwards; the measuring rod of the radial runout tester is vertically pointed to the rear end main journal of the crankshaft and then zeroed; then rotating the rotating frame for the second time so that the Z-direction of the engine block assembly and its components coincides with the direction of gravity and the cylinder head mounting surface of the engine block assembly is facing downwards; and collecting the reading of the radial runout tester, which is the first radial runout. Remove the body assembly and its components from the flipping frame. Fix the radial runout test gauge to the end face of the flywheel. Position the measuring rod of the radial runout test gauge vertically at the six o'clock position on the flywheel housing stop and zero it. Determining the six o'clock position involves: positioning the measuring rod of the radial runout test gauge vertically near the six o'clock position on the flywheel housing stop; rotating the crankshaft and flywheel clockwise and counterclockwise by set rotation angles according to the set step angles, collecting the readings of the radial runout test gauge at each set step angle, and identifying the angle corresponding to the minimum reading, which is the six o'clock position. The second radial runout at the nine o'clock position, the third radial runout at the twelve o'clock position, the fourth radial runout at the three o'clock position, and the fifth radial runout at the six o'clock position are measured sequentially. The fifth radial runout is less than or equal to 0.01 mm. If the fifth radial runout is greater than 0.01 mm, the second, third, fourth, and fifth radial runouts are measured again until the fifth radial runout is less than or equal to 0.01 mm. The radial runout value of the flywheel housing stop is calculated based on the first radial runout, the second radial runout, the third radial runout, and the fourth radial runout.

2. The method for measuring radial runout of the flywheel housing stop according to claim 1, characterized in that, The set step angle is 0.05°-0.5°.

3. The method for measuring radial runout of the flywheel housing stop according to claim 1, characterized in that, The set rotation angle is 2°-15°.

4. The method for measuring radial runout of the flywheel housing stop according to claim 1, characterized in that, The radial runout test gauge is fixed on the end face of the flywheel at a position away from the crankshaft axis.

5. The method for measuring radial runout of the flywheel housing stop according to claim 1, characterized in that, During radial runout measurement, the flywheel housing stop is also equipped with a connecting rod and a piston in the body assembly.

6. The method for measuring radial runout of the flywheel housing stop according to any one of claims 1-5, characterized in that, The rotating tilting frame, as well as the rotating crankshaft and flywheel, are all driven by motors, which are controlled by a host computer.

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