Starter internal gear meshing detection device and detection method

Abstract

The starter internal gear meshing detection device comprises a workbench, a positioning unit and a measuring unit, the positioning unit is arranged on the workbench, a starter internal gear is placed on the positioning unit, and the measuring unit is arranged on the workbench. The invention further provides a detection method according to the starter internal gear meshing detection device, meshing detection of the starter internal gear can be achieved, the starter internal gear meshing detection efficiency can be improved, the accuracy of the detection result can be improved, the starter internal gear production quality can be improved, and the starter internal gear meshing detection method is suitable for popularization and application. And the service life of the starter can be prolonged, and the normal work of the starter can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of starter internal gear testing. Specifically, this invention relates to a starter internal gear meshing testing device and testing method. Background Technology

[0002] The starter motor is the core component that converts electrical energy into mechanical energy to drive the engine crankshaft to achieve starting. Its design revolves around "short-time high-power output, reliable engagement, and adaptability to engine operating conditions." It is widely used in the power systems of various automobiles, including passenger cars and commercial vehicles. It uses DC power provided by the battery to drive the rotor of the electric motor to rotate at high speed, converting electrical energy into mechanical energy. Through an electromagnetic switch or mechanical shift fork, it controls the precise engagement of the drive gear with the engine flywheel ring gear, transmitting the torque of the electric motor to the engine crankshaft. Therefore, the meshing performance of the internal gears of the starter motor directly determines the reliability and stability of the starting process. Good meshing precision can avoid mechanical noise during starting, while poor meshing may lead to a shortened starter motor life, failure to start the engine normally, or even safety hazards.

[0003] Current technologies require meshing tests on starter internal gears. Traditional contact testing techniques typically employ contact spot inspection. During testing, red lead powder, blue oil, or other indicator agents are evenly applied to the starter gear tooth surfaces. The gear pair is manually rotated several times and then separated. The distribution, area, and shape of the contact spots on the tooth surfaces are observed to determine if the meshing is normal. If the spots are centered, large in area, and regularly shaped, the meshing is considered good. However, this method only reflects meshing under static or low-load conditions, which differs significantly from the high-load dynamic scenario of actual starter operation. The test results are difficult to quantify precisely, relying entirely on the experience of the operators. There is no unified standard for evaluating the spot area, resulting in poor reliability. Alternatively, high-precision coordinate measuring equipment can be used to scan along the theoretical tooth profile of the gear, acquiring multiple geometric parameters reflecting meshing quality, such as single tooth pitch error, tooth profile deviation, and radial runout. This can accurately separate various error sources, but the equipment is expensive, the measurement speed is slow, and a complete test cycle is time-consuming, making it unsuitable for efficient sampling inspection on production lines. Furthermore, it requires specialized technicians to operate and interpret the data, further increasing testing costs.

[0004] Therefore, in order to improve or solve at least one of the above problems, a starter internal gear meshing detection device and detection method are provided that can realize the meshing detection of starter internal gears, which is conducive to improving the meshing detection efficiency of starter internal gears, improving the accuracy of detection results, improving the production quality of starter internal gears, being applicable to efficient sampling inspection on the production line, improving starter life, and ensuring that the starter can work normally. Summary of the Invention

[0005] This invention addresses the aforementioned problems and aims to provide a starter internal gear meshing detection device and method that improves detection efficiency, accuracy, and manufacturing quality, is suitable for efficient production line sampling, extends starter life, and ensures normal starter operation. To achieve these objectives, the technical solution adopted by this invention is as follows: The present invention provides a starter internal gear meshing detection device, which includes a worktable, a positioning unit and a measuring unit. The positioning unit is set on the worktable, the starter internal gear is placed on the positioning unit and the measuring unit is set on the worktable.

[0006] The starter internal gear meshing detection device provided by the present invention may also have the following feature: the positioning unit includes a positioning slide and a rotating support assembly disposed on the positioning slide, and the positioning slide is movably disposed on the worktable.

[0007] The starter internal gear meshing detection device provided by the present invention may also have the following feature: a first slider guide rail assembly is provided between the positioning slide and the worktable. The first slider guide rail assembly includes a first guide rail and a first slider. The first guide rail is set on the worktable, and the first slider is movably set on the first guide rail. The first slider is connected to the positioning slide.

[0008] The starter internal gear meshing detection device provided by the present invention may also have the following features: the rotating support assembly includes a rotating base, a rotating spindle, a turntable, and a rotating chuck. The rotating base is mounted on a positioning slide, the rotating spindle is movably mounted on the rotating base, the turntable is connected to the end of the rotating spindle, and the rotating chuck is mounted on the turntable.

[0009] The starter internal gear meshing detection device provided by the present invention may also have the following features: the rotary chuck includes a chuck body and jaws disposed on the chuck body, and the rotary support assembly further includes a gear spindle disposed on the rotary chuck, with the jaws clamping the gear spindle.

[0010] The starter internal gear meshing detection device provided by the present invention may also have the following features: the measuring unit includes a measuring slide, a measuring bracket, and a driving assembly; the measuring slide is movably mounted on the worktable; the measuring bracket is mounted on the measuring slide; the driving assembly is mounted on the measuring bracket and located above the rotating chuck; the measuring bracket includes a supporting vertical plate, a supporting horizontal plate, and an electric telescopic cylinder; the electric telescopic cylinder is mounted on the measuring slide and connected to the supporting vertical plate; the supporting horizontal plate is connected to the supporting vertical plate; and a limiting sleeve is provided on the supporting horizontal plate.

[0011] The starter internal gear meshing detection device provided by the present invention may also have the following feature: a second slider guide rail assembly is provided between the measuring slide and the worktable. The second slider guide rail assembly includes a second guide rail and a second slider. The second guide rail is set on the worktable, and the second slider is movably set on the second guide rail. The second slider is connected to the measuring slide.

[0012] The starter internal gear meshing detection device provided by the present invention may also have the following features: the drive assembly includes a drive rod and a handwheel disposed at the end of the drive rod; the drive rod is movably inserted into the limiting sleeve; a standard gear is provided at the end of the drive rod away from the handwheel; and the standard gear meshes with the starter internal gear.

[0013] The starter internal gear meshing detection device provided by the present invention may also have the following feature: the measuring unit further includes a dial indicator and a connecting bracket, the dial indicator is set on the worktable, and the connecting bracket is connected to the measuring head and positioning slide of the dial indicator.

[0014] This invention also provides a detection method based on the above-mentioned starter internal gear meshing detection device, characterized by the following steps: Step S1, selecting a matching standard gear based on the module, pressure angle, number of teeth, addendum coefficient, and clearance coefficient of the starter internal gear to be tested, ensuring that the starter internal gear to be tested and the standard gear meet the conjugate meshing condition; Step S2, inspecting the tooth surface of the standard gear to ensure that there is no wear, impact, or corrosion, and using a tooth pitch meter to detect the cumulative tooth pitch error and tooth profile error of the standard gear, ensuring that the accuracy of the standard gear meets the measurement reference requirements; Step S3, selecting a standard gear that matches the starter internal gear to be tested. Step S4: The gear mandrel that matches the internal gear of the starter motor is measured, and the gear mandrel is clamped by rotating a chuck. The internal gear of the starter motor to be tested is then fitted onto the gear mandrel. Step S5: A standard gear is installed on the drive rod, and the standard gear is meshed with the internal gear of the starter motor to be tested by moving the measuring carriage and measuring bracket. Step S6: The dial indicator is zeroed and calibrated. Step S7: The standard gear is driven to rotate by the drive assembly, which in turn drives the internal gear of the starter motor to rotate, causing the internal gear of the starter motor to rotate one revolution. The value of the dial indicator is recorded according to the testing requirements. Step S8: The internal gear of the starter motor and the standard gear are removed, and the measured data is processed. The technical effects of this invention are as follows: The starter internal gear meshing detection device provided by this invention includes a worktable, a positioning unit, and a measuring unit. The positioning unit is set on the worktable, the starter internal gear is placed on the positioning unit, and the measuring unit is set on the worktable. This invention also provides a detection method based on the above-mentioned starter internal gear meshing detection device, which can realize the meshing detection of the starter internal gear, which is beneficial to improving the efficiency of starter internal gear meshing detection, improving the accuracy of detection results, improving the production quality of starter internal gears, being suitable for efficient sampling inspection on the production line, improving starter life, and ensuring that the starter can work normally. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the starter internal gear meshing detection device in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the starter internal gear meshing detection device in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the rotary support assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the rotating chuck in an embodiment of the present invention; Figure 5 This is a schematic diagram of the drive rod structure in an embodiment of the present invention.

[0016] The components in the diagram are labeled as follows: starter internal gear-1, worktable-10, positioning unit-20, positioning carriage-21, rotary support assembly-22, rotary base-221, rotary spindle-222, turntable-223, rotary chuck-224, chuck body-2241, chuck jaws-2242, gear spindle-225, first slider guide rail assembly-23, first guide rail-231, first slider-232, measuring unit-30, measuring carriage-31, measuring... Measuring bracket-32, support vertical plate-321, support horizontal plate-322, electric telescopic cylinder-323, limit sleeve-324, drive assembly-33, drive rod-331, handwheel-332, standard gear-333, limit flange-334, keyway-335, limit nut-336, anti-slip flange-337, second slider guide rail assembly-34, second guide rail-341, second slider-342, dial indicator-35, connecting bracket-36. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0018] Figure 1 This is a schematic diagram of the starter internal gear meshing detection device in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the starter internal gear meshing detection device in an embodiment of the present invention. Figure 2 .

[0019] like Figure 1 and Figure 2 As shown, the starter internal gear meshing detection device provided by the present invention includes a worktable 10, a positioning unit 20, and a measuring unit 30. The positioning unit 20 is disposed on the worktable 10, the starter internal gear 1 is placed on the positioning unit 20, and the measuring unit 30 is disposed on the worktable 10. This enables meshing detection of the starter internal gear 1, which is beneficial to improving the efficiency of starter internal gear 1 meshing detection, improving the accuracy of detection results, improving the production quality of starter internal gear 1, being suitable for efficient sampling inspection on the production line, improving starter life, and ensuring that the starter can work normally.

[0020] The positioning unit 20 includes a positioning slide 21 and a rotary support assembly 22 disposed on the positioning slide 21. The positioning slide 21 is movably disposed on the worktable 10. A first slider guide rail assembly 23 is provided between the positioning slide 21 and the worktable 10. The first slider guide rail assembly 23 includes a first guide rail 231 and a first slider 232. The first guide rail 231 is disposed on the worktable 10, and the first slider 232 is movably disposed on the first guide rail 231. The first slider 232 is connected to the positioning slide 21, so that the positioning slide 21 and the rotary support assembly 22 can move along the first guide rail 231. The two first guide rails 231 are arranged parallel to each other to ensure that the positioning slide 21 can slide smoothly and prevent shaking or vibration from affecting the measurement results, which is beneficial to improving the accuracy of the measurement results.

[0021] Figure 3 This is a schematic diagram of the structure of the rotating support assembly in an embodiment of the present invention.

[0022] like Figure 3As shown, the rotating support assembly 22 includes a rotating base 221, a rotating spindle 222, a turntable 223, and a rotating chuck 224. The rotating base 221 is mounted on the positioning slide 21 and has a bearing inside. The rotating spindle 222 is movably mounted on the rotating base 221 and is connected to the inner ring of the bearing. The turntable 223 is connected to the end of the rotating spindle 222. The rotating chuck 224 is mounted on the turntable 223, so that the turntable 223 and the rotating chuck 224 are rotatably mounted on the rotating base 221.

[0023] Figure 4 This is a schematic diagram of the rotating chuck in an embodiment of the present invention.

[0024] like Figure 4 As shown, the rotary chuck 224 includes a chuck body 2241 and jaws 2242 disposed on the chuck body 2241. The jaws 2242 are adjustablely disposed on the chuck body 2241. The rotary support assembly 22 also includes a gear spindle 225. The jaws 2242 clamp the gear spindle 225, thereby setting the gear spindle 225 on the rotary chuck 224. The gear spindle 225 is adapted to the internal gear 1 of the starter motor under test. The gear spindle 225 and the internal gear 1 of the starter motor under test are fixed by a key connection, so that the internal gear 1 of the starter motor under test and the gear spindle 225 can rotate smoothly on the turntable 223, which facilitates the meshing test of the internal gear of the starter motor, improves the efficiency of the meshing test of the internal gear 1 of the starter motor, and improves the accuracy of the test results.

[0025] The measuring unit 30 includes a measuring carriage 31, a measuring bracket 32, and a drive assembly 33. The measuring carriage 31 is movably mounted on the worktable 10, the measuring bracket 32 ​​is mounted on the measuring carriage 31, and the drive assembly 33 is mounted on the measuring bracket 32, located above the rotary chuck 224.

[0026] A second slider guide rail assembly 34 is provided between the measuring slide 31 and the worktable 10. The second slider guide rail assembly 34 includes a second guide rail 341 and a second slider 342. The second guide rail 341 is set on the worktable 10, and the second slider 342 is movably set on the second guide rail 341. The second slider 342 is connected to the measuring slide 31, so that the measuring slide 31 and the measuring support 32 can move along the second guide rail 341, so that the measuring slide 31 can smoothly approach or move away from the positioning slide 21, which facilitates the adjustment of the position of the drive assembly 33 in the horizontal direction.

[0027] The measuring bracket 32 ​​includes a vertical support plate 321, a horizontal support plate 322, and an electric telescopic cylinder 323. The electric telescopic cylinder 323 is mounted on the measuring slide 31 and is connected to the vertical support plate 321. The horizontal support plate 322 is also connected to the vertical support plate 321, allowing the electric telescopic cylinder 323 to move the measuring bracket 32 ​​and the drive assembly 33 vertically, facilitating adjustment of the vertical position of the drive assembly 33. Simultaneously, the horizontal support plate 322 is equipped with a limiting sleeve 324, which is used to limit the movement of the drive assembly.

[0028] Figure 5 This is a schematic diagram of the drive rod structure in an embodiment of the present invention.

[0029] like Figure 5 As shown, the drive assembly 33 includes a drive rod 331 and a handwheel 332 disposed at the end of the drive rod 331. The drive rod 331 rotatably passes through the limiting sleeve 324 and the supporting horizontal plate 322. A bearing is provided between the drive rod 331 and the limiting sleeve 324 and the supporting horizontal plate 322. The drive rod 331 is arranged in a vertical direction so that the drive rod 331 can rotate smoothly in the vertical direction. A standard gear 333 is provided at the end of the drive rod 331 away from the handwheel 332. The standard gear 333 meshes with the starter internal gear 1. By manually turning the handwheel 332, the operator can drive the standard gear 333 to rotate through the drive rod 331, thereby driving the starter internal gear 1 to rotate. Meanwhile, the end of the drive rod 331 furthest from the handwheel 332 is provided with a limiting flange 334, which abuts against the standard gear 333. The end of the drive rod 331 furthest from the handwheel 332 is also provided with a keyway 335, used for a fixed connection between the drive rod 331 and the standard gear 333 via a key connection. The end of the drive rod 331 is also provided with an external thread, and a limiting nut 336 is screwed onto the end of the drive rod 331. The limiting flange 334 and the limiting nut 336 are respectively located on both sides of the standard gear 333, thus fixing the standard gear 333 and preventing it from shaking or vibrating during testing, thereby further improving the accuracy of the test results. The end of the drive rod 331 closest to the handwheel 332 is provided with an anti-slip flange 337, which abuts against the support plate 322 to prevent the drive rod 331 from slipping and improving the reliability of the structure.

[0030] It can also be connected to the drive rod 331 via a servo motor and reducer, replacing the operator. The servo motor and reducer drive the drive rod 331 to rotate smoothly, further improving the accuracy of the test results and reducing the labor intensity of the operator.

[0031] The measuring unit 30 also includes a dial indicator 35 and a connecting bracket 36. The dial indicator 35 is set on the workbench 10. The connecting bracket 36 is connected to the measuring head of the dial indicator 35 and the positioning slide 21. During the rotation of the starter internal gear 1, the starter internal gear 1 will generate radial runout due to its own tooth profile error and tooth pitch error. The radial runout will be transmitted to the positioning slide 21, which will push the measuring head of the dial indicator 35 to generate displacement, causing the reading of the dial indicator 35 to change, thereby obtaining the test data.

[0032] The present invention also provides a detection method based on the above-described starter internal gear meshing detection device, characterized by comprising the following steps: Step S1: Select a matching standard gear 333 based on the module, pressure angle, number of teeth, addendum coefficient, and clearance coefficient of the internal gear 1 of the starter motor under test, to ensure that the internal gear 1 of the starter motor under test and the standard gear 333 meet the conjugate meshing condition.

[0033] Step S2: Inspect the tooth surface of standard gear 333 to ensure there is no wear, impact, or corrosion. Use a tooth pitch meter to check the cumulative tooth pitch error and tooth profile error of standard gear 333 to ensure that the accuracy of standard gear 333 meets the measurement reference requirements.

[0034] Step S3: Select a gear spindle 225 that matches the internal gear 1 of the starter motor to be tested, and clamp the gear spindle 225 by rotating the chuck, and put the internal gear 1 of the starter motor to be tested onto the gear spindle 225.

[0035] Step S4: Install the standard gear 333 on the drive rod 331, and move the measuring slide 31 and measuring bracket 32 ​​to make the standard gear 333 mesh with the internal gear 1 of the starter motor to be tested.

[0036] Step S5: Zero and verify the dial indicator 35.

[0037] In step S6, the drive assembly 33 drives the standard gear 333 to rotate, which in turn drives the internal gear 1 of the starter motor under test to rotate. The internal gear 1 of the starter motor under test rotates one revolution, and the dial indicator reading is recorded according to the testing requirements. In step S6, the drive rod 331 is rotated manually or mechanically to make the standard gear 333 mesh with the internal gear 1 of the starter motor under test tooth by tooth. The rotation speed is uniform and ≤10 r / min to avoid the influence of centrifugal force on the test results. The dial indicator reading is recorded after each tooth pitch angle (360° / z, where z is the number of teeth of the internal gear 1 of the starter motor under test). If it is a continuous measurement, the change in the dial indicator pointer is observed in real time during one revolution, and the maximum and minimum values ​​are recorded. At least two revolutions are measured to ensure data repeatability. If the dial indicator pointer shows a sudden change during the measurement (e.g., a jump ≥0.005 mm), the measurement must be paused, and the tooth surface must be checked for defects, and the meshing must be checked for jamming. After eliminating the abnormality, the measurement is repeated.

[0038] Step S7: Remove the starter internal gear 1 and standard gear 333, process the measured data. During the meshing process, the radial runout of the tested starter internal gear 1 is equal to the difference between the maximum and minimum values ​​of the measured data.

[0039] The starter internal gear meshing detection device provided by the present invention includes a worktable 10, a positioning unit 20, and a measuring unit 30. The positioning unit 20 is disposed on the worktable 10, the starter internal gear 1 is placed on the positioning unit 20, and the measuring unit 30 is disposed on the worktable 10. This enables meshing detection of the starter internal gear 1, which is beneficial to improving the efficiency of starter internal gear 1 meshing detection, improving the accuracy of detection results, improving the production quality of starter internal gear 1, being suitable for efficient sampling inspection on the production line, improving starter life, and ensuring that the starter can work normally.

[0040] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A starter internal gear meshing detection device, characterized in that, It includes a worktable (10), a positioning unit (20) and a measuring unit (30). The positioning unit (20) is set on the worktable (10), the starter internal gear (1) is placed on the positioning unit (20), and the measuring unit (30) is set on the worktable (10).

2. The starter internal gear meshing detection device according to claim 1, characterized in that, The positioning unit (20) includes a positioning slide (21) and a rotating support assembly (22) disposed on the positioning slide (21), wherein the positioning slide (21) is movably disposed on the worktable (10).

3. The starter internal gear meshing detection device according to claim 2, characterized in that, A first slider guide rail assembly (23) is provided between the positioning slide (21) and the worktable (10). The first slider guide rail assembly (23) includes a first guide rail (231) and a first slider (232). The first guide rail (231) is disposed on the worktable (10), and the first slider (232) is movably disposed on the first guide rail (231). The first slider (232) is connected to the positioning slide (21).

4. The starter internal gear meshing detection device according to claim 3, characterized in that, The rotating support assembly (22) includes a rotating base (221), a rotating spindle (222), a turntable (223), and a rotating chuck (224). The rotating base (221) is mounted on the positioning slide (21). The rotating spindle (222) is movably mounted on the rotating base (221). The turntable (223) is connected to the end of the rotating spindle (222). The rotating chuck (224) is mounted on the turntable (223).

5. The starter internal gear meshing detection device according to claim 4, characterized in that, The rotary chuck (224) includes a chuck body (2241) and jaws (2242) disposed on the chuck body (2241). The rotary support assembly (22) also includes a gear spindle (225), which is disposed on the rotary chuck (224), and the jaws (2242) clamp the gear spindle (225).

6. The starter internal gear meshing detection device according to claim 5, characterized in that, The measuring unit (30) includes a measuring carriage (31), a measuring bracket (32), and a driving assembly (33). The measuring carriage (31) is movably mounted on the worktable (10). The measuring bracket (32) is mounted on the measuring carriage (31). The driving assembly (33) is mounted on the measuring bracket (32) and located above the rotary chuck (224). The measuring bracket (32) includes a supporting vertical plate (321), a supporting horizontal plate (322), and an electric telescopic cylinder (323). The electric telescopic cylinder (323) is mounted on the measuring carriage (31) and is connected to the supporting vertical plate (321). The supporting horizontal plate (322) is connected to the supporting vertical plate (321). A limiting sleeve (324) is provided on the supporting horizontal plate (322).

7. The starter internal gear meshing detection device according to claim 6, characterized in that, A second slider guide rail assembly (34) is provided between the measuring carriage (31) and the worktable (10). The second slider guide rail assembly (34) includes a second guide rail (341) and a second slider (342). The second guide rail (341) is disposed on the worktable (10), and the second slider (342) is movably disposed on the second guide rail (341). The second slider (342) is connected to the measuring carriage (31).

8. The starter internal gear meshing detection device according to claim 7, characterized in that, The drive assembly (33) includes a drive rod (331) and a handwheel (332) disposed at the end of the drive rod (331). The drive rod (331) is movably inserted into the limiting sleeve (324). A standard gear (333) is provided at the end of the drive rod (331) away from the handwheel (332). The standard gear (333) meshes with the starter internal gear (1).

9. The starter internal gear meshing detection device according to claim 8, characterized in that, The measuring unit (30) also includes a dial indicator (35) and a connecting bracket (36). The dial indicator (35) is set on the workbench (10), and the connecting bracket (36) is connected to the measuring head of the dial indicator (35) and the positioning slide (21).

10. A detection method for the starter internal gear meshing detection device according to any one of claims 1 to 9, characterized in that, The process includes the following steps: Step S1, selecting a matching standard gear (333) based on the module, pressure angle, number of teeth, addendum coefficient, and clearance coefficient of the starter internal gear (1) to ensure that the starter internal gear (1) and the standard gear (333) meet the conjugate meshing condition; Step S2, inspecting the tooth surface of the standard gear (333) to ensure that there is no wear, impact, or corrosion, and using a pitch meter to detect the cumulative pitch error and tooth profile error of the standard gear (333) to ensure that the accuracy of the standard gear (333) meets the measurement reference requirements; Step S3, selecting a gear mandrel (225) that is compatible with the starter internal gear (1) to be tested, and clamping the gear mandrel (225) by rotating a chuck. Step S4: Mount the standard gear (333) on the drive rod (331), and mesh the standard gear (333) with the internal gear (1) of the starter motor under test by moving the measuring slide (31) and the measuring bracket (32); Step S5: Zero the dial indicator (35) for verification; Step S6: Drive the standard gear (333) to rotate through the drive assembly (33), thereby driving the internal gear (1) of the starter motor under test to rotate, so that the internal gear (1) of the starter motor under test rotates one revolution, and record the value of the dial indicator according to the test requirements; Step S7: Remove the internal gear (1) of the starter motor and the standard gear (333), and process the measured data.

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