A kind of inner gear ring knock detection screening equipment and method

Abstract

The present application relates to a kind of inner gear ring knock detection screening equipment and method, belong to the manufacturing technical field of inner gear ring for automobile transfer case.Technical scheme: the workpiece gear ring to be measured is placed in the annular stepped recess of workpiece positioning seat, the pressing arm of corner cylinder is pressed the upper end surface of the workpiece inner gear ring to be measured, servo motor is started, is transmitted to planetary gear mechanism through coupling, transmission shaft concentricity, multiple planetary gears in planetary gear mechanism are engaged with the workpiece inner gear ring to be measured, and the working condition when transfer case is checked is truly simulated;The noise of planetary gear and the workpiece inner gear ring to be measured is detected by decibel meter, and the maximum allowable sound pressure level ≤85dB is qualified.The positive effect of the present application: the working condition of planetary mechanism and inner gear ring inside transfer case when transfer case assembly is checked is truly simulated, slight knock can also be detected, avoids the risk of missed detection, and improves the first time inspection pass rate of transfer case.

Description

Technical Field

[0001] This invention relates to an internal gear ring impact detection and screening device and method, belonging to the field of internal gear ring manufacturing technology for automotive transfer cases. Background Technology

[0002] The transfer case is a crucial component of four-wheel drive vehicles, and users' demands for all-weather, all-road-condition four-wheel drive safety are continuously increasing. The planetary reduction mechanism is the core device for the transfer case to achieve deceleration and torque increase. The internal gear ring, as a core component of the planetary reduction mechanism, directly affects the smoothness and noise level of the transfer case assembly. Abnormal bumps or protrusions on the teeth of the internal gear ring will directly result in knocking sounds in the transfer case assembly, leading to its failure. Therefore, it is necessary to inspect the internal gear ring for bumps. Currently, there are technologies that allow manual rotation of a standard gear and engagement with the internal gear ring using a gear meshing tester (a known and widely used testing device) before transfer case assembly to check for bumps. The existing technology has the following problems: it cannot realistically simulate the working conditions of the planetary mechanism and internal gear ring inside the transfer case during the final inspection test, resulting in low accuracy; moreover, it is greatly affected by human factors, posing a risk of missed detections. It requires the operator to manually rotate the internal gear ring to mesh with the standard gear without backlash, relying on tactile feedback to detect vibrations and identify any impacts to the internal gear ring. This requires a high level of operator skill, and minor impacts cannot be detected, compromising the reliable quality of product assembly. Furthermore, the testing efficiency is low, requiring the operator to manually rotate the internal gear ring multiple times to mesh with the standard gear, with a single-piece inspection time of 2-4 minutes. Summary of the Invention

[0003] This invention proposes an internal gear ring collision detection and screening device and method, which realistically simulates the working conditions of the planetary mechanism and internal gear ring inside the transfer case during the transfer case final inspection test. It can detect even minor collisions, avoid the risk of missed detection, improve the first-pass yield of transfer cases, and solve the above-mentioned technical problems existing in the prior art.

[0004] The technical solution of this invention is: An inner gear ring bump detection and screening apparatus, comprising a mounting frame; a mounting hole is formed in the center of the mounting frame, a planetary gear mechanism, an inner gear ring positioning seat and a servo motor are sequentially and concentrically mounted in the mounting hole from top to bottom, the inner cavity of the inner gear ring positioning seat is an annular stepped groove with an inner diameter gradually decreasing from top to bottom, the annular stepped groove is open at both top and bottom, and a central hole is formed at the middle position thereof, the mounting hole of the mounting frame is arranged concentrically with the central hole of the inner gear ring positioning seat; the planetary gear mechanism consists of a transmission shaft, planetary gears, ball bearings and a planetary holder, the transmission shaft is arranged at the center of the planetary holder through the ball bearings, a plurality of planetary gears are uniformly arranged in the circumferential direction of the planetary holder, and the top of the transmission shaft is provided with a gear that meshes with the plurality of planetary gears; the transmission shaft passes through the central hole and is connected to the output shaft of the servo motor below the mounting frame through a coupling; the inner diameter of the uppermost step of the annular stepped groove is larger than the outer diameter of the inner gear ring of the workpiece to be tested, the inner gear ring of the workpiece to be tested is placed in the uppermost step, and the inner diameter of the inner gear ring of the workpiece to be tested matches the outer diameter of the planetary gear mechanism.

[0005] Further, the mounting frame is provided with a rotary cylinder, and the pressure arm of the rotary cylinder presses the inner gear ring of the workpiece to be tested located in the gear ring positioning seat.

[0006] Further, a motor mounting frame is arranged below the mounting frame, the upper end of the motor mounting frame is fixed below the mounting frame, the lower end of the motor mounting frame is connected with the servo motor, and the transmission shaft and the output shaft of the servo motor are connected inside the motor mounting frame through the coupling.

[0007] Further, the planetary gear mechanism is provided with two ball bearings, which are jointly installed between the transmission shaft and the planetary holder.

[0008] Further, a protective plate is mounted above the mounting frame through a protective plate mounting frame, and the protective plate encloses the rotary cylinder and the mounting frame.

[0009] A method for detecting and screening bumps on an inner gear ring, which uses the above-mentioned inner gear ring bump detection and screening apparatus in cooperation with a decibel meter for screening, places the gear ring of the workpiece to be tested into the annular stepped groove of the inner gear ring positioning seat 3, the pressure arm of the rotary cylinder presses the upper end face of the inner gear ring of the workpiece to be tested, the servo motor is started, and power is concentrically transmitted to the planetary gear mechanism through the coupling and the transmission shaft, the plurality of planetary gears in the planetary gear mechanism mesh with the inner gear ring of the workpiece to be tested to truly simulate the working condition during the transfer case inspection; the meshing noise between the planetary gears and the inner gear ring of the workpiece to be tested is detected by the decibel meter, and a maximum allowable sound pressure level of ≤85dB is regarded as qualified (this value is given by the test conditions of the transfer case inspection).

[0010] Further, the decibel meter is fixed at a position 300mm vertically away from the inner gear ring of the workpiece to be tested for detection.

[0011] The positive effects of this invention are: it realistically simulates the working conditions of the planetary mechanism and internal gear ring inside the transfer case during the final acceptance test of the transfer case, and can detect even minor bumps, avoiding the risk of missed inspections and improving the first-time acceptance rate of the transfer case. Attached Figure Description

[0012] Figure 1 This is a front view schematic diagram of the assembly drawing according to an embodiment of the present invention; Figure 2 This is a top view of the assembly diagram according to an embodiment of the present invention; Figure 3 This is a front view schematic diagram of the internal gear ring of the workpiece under test in this invention; Figure 4 This is a side view of the internal gear ring of the workpiece being tested according to the present invention. Figure 5 This is a cross-sectional schematic diagram of the internal gear ring positioning seat according to an embodiment of the present invention; Figure 6 This is a top view of the internal gear ring positioning seat according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a planetary gear mechanism according to an embodiment of the present invention; Figure 8 This is a front view of the concentric positioning plate according to an embodiment of the present invention; Figure 9 This is a side view of the concentric positioning plate according to an embodiment of the present invention; Figure 10 This is a schematic diagram of a motor mounting bracket according to an embodiment of the present invention; In the diagram: 1. Planetary gear mechanism; 2. Internal gear ring of the workpiece under test; 3. Internal gear ring positioning seat; 4. Concentric positioning plate; 5. Motor mounting bracket; 6. Drive shaft; 7. Coupling; 8. Servo motor; 9. Rotary cylinder; 10. Protective plate; 11. Protective plate mounting bracket; 12. Bolt 1; 13. Mounting bracket; 14. Bolt 2; 15. Bolt 3; 16. Bolt 4; 17. Planetary gear; 18. Ball bearing; 19. Planetary cage; 20. Gear; 21. Pressure arm; 22. Center hole; 23. Circular stepped groove. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] See attached document Figure 1-10A collision detection and screening device for internal gear rings includes a mounting frame 13. The mounting frame 13 has a central mounting hole, within which a planetary gear mechanism 1, an internal gear ring positioning seat 3, and a servo motor 8 are concentrically mounted from top to bottom. The inner cavity of the internal gear ring positioning seat 3 is a stepped annular groove 23 with an inner diameter gradually decreasing from top to bottom. The stepped annular groove 23 has openings at the top and bottom, with a central hole 22 at its center. The mounting hole of the mounting frame 13 is concentrically arranged with the central hole 22 of the internal gear ring positioning seat 3. The planetary gear mechanism 1 consists of a drive shaft 6, planetary gears 17, ball bearings 18, and a planetary cage 19. The structure consists of a drive shaft 6 mounted at the center of a planetary cage 19 via a ball bearing 18. Multiple planetary gears 17 are evenly arranged around the circumference of the planetary cage 19. A gear 20 is located at the top of the drive shaft 6 and meshes with the multiple planetary gears 17. The drive shaft 6 passes through a central hole 22 and is connected to the output shaft of a servo motor 8 located below the mounting bracket 13 via a coupling 7. The inner diameter of the uppermost step of the annular stepped groove 23 is larger than the outer diameter of the internal gear ring 2 of the workpiece being tested. The internal gear ring 2 of the workpiece being tested is placed in the uppermost step, and its inner diameter matches the outer diameter of the planetary gear mechanism 1.

[0015] The mounting bracket 13 is equipped with a corner cylinder 9, and the pressure arm 21 of the corner cylinder 9 presses the inner gear ring 2 of the workpiece to be tested located in the gear ring positioning seat 3.

[0016] The mounting bracket 13 is provided with a motor mounting bracket 5 below it. The upper end of the motor mounting bracket 5 is fixed to the lower end of the mounting bracket 13, and the lower end of the motor mounting bracket 5 is connected to the servo motor 8. The transmission shaft 6 and the output shaft of the servo motor 8 are connected inside the motor mounting bracket 5 through a coupling 7.

[0017] The planetary gear mechanism 1 has two ball bearings 18, which are installed together between the drive shaft 6 and the planetary cage 19.

[0018] The mounting bracket 13 is equipped with a protective plate 10 via a protective plate mounting bracket 11. The protective plate 10 encloses the corner cylinder 9 and the mounting bracket 13.

[0019] The protective plate 10 consists of four acrylic protective plates, which are installed around the mounting frame 13.

[0020] In the embodiment, the concentric positioning plate 4 is mounted on the mounting frame 13, a mounting hole is provided at the center of the concentric positioning plate 4, the spigot outer circle of the inner gear ring positioning seat 3 is fitted with the mounting hole of the concentric positioning plate 4 to ensure concentricity and is mounted on the concentric positioning plate 4 through four second bolts 14, two corner cylinders 9 are mounted on the concentric positioning plate 4 with hexagon socket head bolts, the spigot outer circle of the motor mounting frame 5 is fitted with the mounting hole of the concentric positioning plate 4 to ensure concentricity and is mounted on the concentric positioning plate 4 through four third bolts 15, the transmission shaft 6 and the servo motor 8 are connected through the coupling 7, the transmission shaft 6 passes through the inner hole of the motor mounting frame 5, and at the same time, the outer circle spigot of the servo motor 8 is fitted with the inner hole of the motor mounting frame 5 to ensure concentricity, the servo motor 8 is mounted on the motor mounting frame 5 through four fourth bolts 16, then the planetary gear mechanism 1 is assembled with concentric clearance by fitting the outer circle of the bearing with the upper step of the inner cavity of the inner gear ring positioning seat 3, and finally the four protection plates 10 are mounted on the concentric positioning plate 4 through sixteen first bolts 12. The assembly and installation are as shown in the attached Figure 1 and 2 shown for installation.

[0021] A method for detecting and screening inner gear ring knocks uses the above-mentioned inner gear ring knock detection and screening equipment in cooperation with a decibel meter for screening. The tested workpiece gear ring 2 is placed into the annular stepped groove 23 of the inner gear ring positioning seat 3, the pressure arm 21 of the corner cylinder 9 presses the upper end face of the tested workpiece inner gear ring 2, the servo motor 8 is started, and the motion is concentrically transmitted to the planetary gear mechanism 1 through the coupling 7 and the transmission shaft 6. A plurality of planetary gears 17 in the planetary gear mechanism 1 mesh with the tested workpiece inner gear ring 2 to truly simulate the working condition during the transfer case inspection; the meshing noise between the planetary gears 17 and the tested workpiece inner gear ring 2 is detected by the decibel meter, and a maximum allowable sound pressure level ≤85dB is qualified (this value is given by the transfer case inspection test conditions).

[0022] The decibel meter is fixed at a position 300mm vertically away from the tested workpiece inner gear ring 2 for detection.

[0023] The set rotational speed of the servo motor is 1450rpm (the rated rotational speed during the final assembly inspection test of the transfer case), and at this time the planetary gear mechanism 1 operates at a rotational speed of 1450rpm; if the tooth surface of the tested workpiece inner gear ring 2 has a knock, vibration noise will be generated during meshing, and the tested workpiece inner gear ring 2 is unqualified. If there is no knock on the tooth surface of the tested workpiece inner gear ring 2, the meshing movement is smooth with no abnormal noise.

[0024] The present invention has high detection efficiency, and the detection time for a single part is about 1 minute. The present invention truly simulates the working condition of the planetary mechanism and the inner gear ring inside the transfer case during the final assembly inspection test of the transfer case, so that even slight knocks can be detected, the risk of missed detection is avoided, and the one-time pass rate of the transfer case inspection is improved.

[0025] In the embodiment, the planetary gear mechanism 1 used for the transfer case is driven by the transmission shaft 6, which inputs the rotational speed to the planetary gear mechanism 1. The planetary gear mechanism drives the planetary gear 17 to rotate and mesh with the internal gear ring 2 of the workpiece being tested. The internal teeth of the internal gear ring 2 of the workpiece being tested mesh with the external teeth of the planetary gear 17 in the planetary gear mechanism 1.

[0026] The function of the internal gear ring positioning seat 3 is to position the planetary gear mechanism 1 and the internal gear ring 2 of the workpiece being measured. The inner wall of the internal gear ring positioning seat 3 is stepped, and the maximum inner diameter of the upper step is the same as the outer diameter of the internal gear ring 2 of the workpiece being measured. The inner diameter of the center hole 22 of the internal gear ring positioning seat 3 is the same as the outer diameter of the transmission shaft 6 of the planetary gear mechanism 1.

[0027] In this embodiment, the center hole 22 of the internal gear ring positioning seat 3 is a Ф90mm inner stop, and the maximum inner diameter of the inner wall of the annular stepped groove 23 of the internal gear ring positioning seat 3 is a Ф164.6mm inner stop. The two are concentric (concentricity ≤ 0.005mm). The Ф90mm outer ring of the ball bearing on the planetary gear mechanism 1 is fitted with the Ф90mm inner stop of the center hole in the internal gear ring positioning seat 3. The Ф164.6mm outer circle of the internal gear ring 2 of the workpiece being tested is fitted with the maximum inner diameter Ф164.6mm inner stop of the inner wall of the annular stepped groove, ensuring the concentricity requirement when the planetary gear mechanism 1 and the internal gear ring 2 of the workpiece being tested are meshed.

[0028] The rotary cylinder 9 is a common clamping element in industrial automation. During operation, the piston first drives the pressure arm to rotate to a preset position, and then presses down linearly to clamp the workpiece. When released, it returns along the original path. Its function is to press the end face of the internal gear ring 2 of the workpiece being measured to prevent its axial movement and ensure stable meshing with the planetary gear mechanism 1.

[0029] The concentric positioning plate 4 ensures that the internal gear ring positioning seat 3 and the motor mounting bracket 5 are concentric. The internal gear ring positioning seat 3 has a Ф106mm outer stop that mates with the Ф106mm center hole of the concentric positioning plate, and the motor mounting bracket has a Ф106mm outer stop that mates with the Ф106mm center hole of the concentric positioning plate, ensuring concentricity between the internal gear ring positioning seat 3 and the motor mounting bracket 5. The motor mounting bracket 5 is used to mount the servo motor 8. The Ф106mm outer stop and the Ф95mm inner stop of the motor mounting bracket 5 are concentric (concentricity ≤ 0.005mm), ensuring that the servo motor 8 is concentric with the internal gear ring positioning seat 3 during installation. One end of the coupling 7 is connected to the servo motor 8, and the other end is connected to the drive shaft 6. The servo motor 8 transmits the input speed to the planetary gear mechanism 1 concentrically through the coupling 7 and the drive shaft 6.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A collision detection and screening device for internal gear rings, characterized in that: Includes a mounting bracket (13); the mounting bracket (13) has a mounting hole at its center, in which a planetary gear mechanism (1), an internal gear ring positioning seat (3), and a servo motor (8) are concentrically mounted from top to bottom. The inner cavity of the internal gear ring positioning seat (3) is a circular stepped groove (23) with an inner diameter that gradually decreases from top to bottom. The central hole (22) is formed at the middle position of the opening of the circular stepped groove (23). The mounting hole of the mounting bracket (13) is concentrically arranged with the central hole (22) of the internal gear ring positioning seat (3). The planetary gear mechanism (1) is composed of a drive shaft (6), planetary gears (17), ball bearings (18), and a planetary cage (19). The ball bearing (18) is set at the center of the planetary cage (19). Multiple planetary gears (17) are evenly arranged in the circumferential direction of the planetary cage (19). The top of the drive shaft (6) is provided with a gear (20) and meshes with multiple planetary gears (17). The drive shaft (6) passes through the central hole (22) and is connected to the output shaft of the servo motor (8) below the mounting frame (13) through the coupling (7). The inner diameter of the uppermost step of the annular stepped groove (23) is larger than the outer diameter of the inner gear ring (2) of the workpiece being tested. The inner gear ring (2) of the workpiece being tested is placed in the uppermost step, and the inner diameter of the inner gear ring (2) of the workpiece being tested matches the outer diameter of the planetary gear mechanism (1).

2. The internal gear ring collision detection and screening device according to claim 1, characterized in that: The mounting bracket (13) is equipped with a rotary cylinder (9), and the pressure arm (21) of the rotary cylinder (9) presses the inner gear ring (2) of the workpiece to be tested located in the gear ring positioning seat (3).

3. The internal gear ring collision detection and screening device according to claim 1 or 2, characterized in that: The mounting bracket (13) is provided with a motor mounting bracket (5) below it. The upper end of the motor mounting bracket (5) is fixed below the mounting bracket (13), and the lower end of the motor mounting bracket (5) is connected to the servo motor (8). The transmission shaft (6) and the output shaft of the servo motor (8) are connected inside the motor mounting bracket (5) through a coupling (7).

4. The internal gear ring collision detection and screening device according to claim 1 or 2, characterized in that: The planetary gear mechanism (1) has two ball bearings (18) which are mounted together between the drive shaft (6) and the planetary cage (19).

5. The internal gear ring collision detection and screening device according to claim 1 or 2, characterized in that: The mounting bracket (13) is equipped with a protective plate (10) via a protective plate mounting bracket (11), and the protective plate (10) encloses the corner cylinder (9) and the mounting bracket (13).

6. A method for detecting and screening internal gear rings by impact, comprising using the internal gear ring impact detection and screening equipment according to any one of claims 1-5 in conjunction with a decibel meter for screening, characterized in that: The workpiece gear ring (2) to be tested is placed in the annular stepped groove (23) of the workpiece positioning seat (3). The pressure arm (21) of the rotary cylinder (9) presses the upper end face of the inner gear ring (2) of the workpiece to be tested. The servo motor (8) is started and transmitted to the planetary gear mechanism (1) concentrically through the coupling (7) and the transmission shaft (6). Multiple planetary gears (17) in the planetary gear mechanism (1) mesh with the inner gear ring (2) of the workpiece to be tested, which truly simulates the working condition when the transfer case is inspected. The meshing noise of the planetary gear (17) and the inner gear ring (2) of the workpiece to be tested is detected by a decibel meter. The maximum permissible sound pressure level ≤85dB is qualified.

7. The method for detecting and screening collisions in an internal gear ring according to claim 6, characterized in that: The decibel meter is fixed at a distance of 300 mm from the internal gear ring (2) of the workpiece being measured in the vertical direction for detection.

Images