Planet wheel shot blasting protection tool

Abstract

The utility model relates to the technical field of product protection, in particular to a planet wheel shot blasting protection tool which comprises an end face protection device and a tooth face protection device. The end face protection device comprises a base plate, a pressing plate, a double-thread screw and a nut, wherein the base plate and the pressing plate are oppositely arranged, the double-thread screw is in threaded connection with the base plate and the pressing plate, and the nut is used for locking the pressing plate. Each of the base plate and the pressing plate comprises a large head tightly attached to the planet wheel and a small head capable of being inserted into a central inner hole of the planet wheel; the tooth surface protection device comprises a plurality of V-shaped sheets and an adhesive tape, the thickness of each V-shaped sheet is 0.8-1mm, and the included angle of each V-shaped sheet is 2-3 degrees smaller than the pressure angle of the planet wheel; according to the scheme, the technical problem that the tooth surface and other important parts are easily damaged when the tooth root of the planet wheel is subjected to shot peening strengthening can be solved.

Description

Technical Field

[0001] This utility model relates to the field of product protection technology, specifically a planetary gear shot peening protective tool. Background Technology

[0002] Planetary gears are gears whose axis of rotation is not fixed and are mounted on a rotatable support. Besides rotating around their own axis like fixed-axis gears, planetary gears also rotate around the axes of other gears along with the support. Rotation around their own axis is called "rotation," and rotation around the axes of other gears is called "revolution," just like the planets in the solar system, hence the name.

[0003] Wear, corrosion, and fracture are the three major failure modes of machine parts. Planetary gear failures primarily manifest as tooth surface spalling, pitting, or fracture. Therefore, improvements in gear fatigue life must be sought from design, materials, and manufacturing processes. Shot peening is a commonly used surface strengthening method for planetary gears, significantly improving the bending fatigue resistance of the tooth roots. In practical applications, equipment malfunctions may be caused by the failure of the planetary gears. After disassembly and technical assessment confirming the planetary gears are still usable, tooth root shot peening is generally performed. Since the planetary gears are already in a finished product state at this point, the tooth surfaces and other critical areas must be protected during shot peening. There is an urgent need for a protective fixture for shot peening planetary gears. Utility Model Content

[0004] This invention provides a protective tooling for planetary gear shot peening, which can solve the technical problem that the tooth surface and other important parts of the planetary gear are easily damaged when shot peening the tooth root.

[0005] This application provides the following technical solution:

[0006] A planetary gear shot peening protective fixture includes an end face protection device and a tooth surface protection device. The end face protection device includes a pad and a pressure plate arranged opposite each other, a double-ended screw threaded to the pad and the pressure plate respectively, and a nut for locking the pressure plate. The pad and the pressure plate each include a large end that is close to the planetary gear and a small end that can be inserted into the central inner hole of the planetary gear. The tooth surface protection device includes several V-shaped pieces and a tape. The thickness of the V-shaped pieces is 0.8mm-1mm, and the included angle of the V-shaped pieces is less than the pressure angle of the planetary gear by 2°-3°.

[0007] Beneficial effects:

[0008] 1. Comprehensive protection for planetary gears except for the tooth roots: The end-face protection device, through the design of pads and pressure plates, effectively protects the parts of the planetary gears other than the teeth, ensuring that these important parts are not subjected to unnecessary damage during shot peening. The tooth surface protection device uses V-shaped plates and tape to meticulously protect the tooth surfaces in the tooth section, avoiding direct impact on the tooth surfaces during shot peening, ensuring the integrity of the tooth surfaces while strengthening the tooth roots.

[0009] 2. Easy installation and improved work efficiency: The quick-release structure, including a pad, pressure plate, and double-ended screw, allows for simple and quick installation and disassembly, reducing operation time and improving overall work efficiency. This design makes the protective device more convenient to use; operators only need to follow a few prescribed steps to complete the planetary gear protection work, simplifying the operation process and reducing labor intensity.

[0010] 3. Optimal protection is achieved by limiting the thickness and angle of the V-shaped strip: The thickness of the V-shaped strip is limited to 0.8mm-1mm. Actual testing has verified that this thickness range ensures that the V-shaped strip is easy to strike and not easily deformed, while also ensuring it can be firmly locked onto the planetary gear teeth, providing optimal protection. The V-shaped strip is made by bending ordinary iron sheet. The included angle of the bent V-shaped strip is designed to be 2°-3° less than the pressure angle of the planetary gear, allowing the V-shaped strip to fit tightly against the tooth surface and lock securely, further enhancing the reliability and stability of the protection, while avoiding installation difficulties caused by over-fitting.

[0011] In summary, through the above improvements, the planetary gear shot peening protective fixture not only achieves comprehensive and meticulous protection for planetary gears, but also improves work efficiency and ease of operation through its quick-release structure and optimized V-shaped plate design, ensuring the safety and effectiveness of shot peening treatment and providing a reliable solution for the maintenance and repair of planetary gears.

[0012] Furthermore, as an improvement, a through hole is made in the center of the pressure plate for the double-ended screw to pass through.

[0013] Beneficial effects: The through-hole design ensures that the double-ended screw can pass smoothly through the pressure plate, avoiding installation difficulties caused by misalignment, making the installation process of the pressure plate smoother and more convenient.

[0014] Furthermore, as an improvement, the tooth surface protection device also includes steel wire for binding several V-shaped plates together.

[0015] Beneficial effects: The steel wire firmly binds multiple V-shaped pieces together, effectively preventing individual V-shaped pieces from loosening or falling off due to external impact during shot peening. This ensures the overall integrity of the protective device, enhances the stability of the entire protective device, and guarantees the effect and quality of shot peening.

[0016] Furthermore, as an improvement, the width of the V-shaped plate is 20-30 mm wider than the width of the planetary gear teeth.

[0017] Beneficial effects: Limiting the width of the V-shaped plate to 20-30mm greater than the tooth width of the planetary gear ensures complete coverage of the tooth surface and surrounding area, preventing any part of the tooth surface from being exposed during shot peening and providing more comprehensive protection. The larger width also allows the V-shaped plate to better adapt to the tooth surface contour, especially for involute-shaped teeth, improving the fit between the V-shaped plate and the tooth surface, reducing blind spots, and ensuring the safety and effectiveness of the shot peening process.

[0018] Furthermore, as an improvement, a lifting ring is fixedly installed on the pressure plate.

[0019] Beneficial effects: By fixing lifting rings to the pressure plate, heavy pads and pressure plates can be easily lifted using overhead cranes or other lifting equipment, reducing the need for manual handling and improving operational convenience and efficiency. It also avoids the risks of slippage or loss that may occur during manual handling, ensuring the safety of operators. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of a first embodiment of a planetary gear shot peening protective fixture of this utility model;

[0021] Figure 2 for Figure 1 Top view of planetary gear 1 (cropped 1 / 4);

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the tooth surface protection device 3. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The markings in the accompanying drawings include: planetary gear 1, tooth 11, tooth surface 111, tooth root 112, bearing 12, end face protection device 2, pad 21, large end 211, small end 212, pressure plate 22, double-ended screw 23, nut 24, tooth surface protection device 3, V-shaped plate 31, tape 32, and wire 33.

[0025] Example 1

[0026] like Figures 1-3 As shown, a planetary gear shot peening protective fixture includes an end face protection device 2 and a tooth surface protection device 3.

[0027] The end face protection device 2 includes a pad 21 and a pressure plate 22 arranged opposite to each other, a double-ended screw 23 passing between the pad 21 and the pressure plate 22, and a nut 24 for locking the pressure plate 22.

[0028] The backing plate 21 is a stepped cylindrical shape, including a large end 211 that fits tightly against the bottom of the planetary gear and a small end 212 that inserts into the central inner hole of the planetary gear. The large end 211 and the small end 212 are integrally formed. The maximum outer diameter of the backing plate 21 (i.e., the diameter of the large end 211) should be between the inner diameter of the planetary gear and the diameter of the planetary gear tooth root 112. In this embodiment, the diameter of the large end 211 on the backing plate 21 is 572 mm, the inner diameter of the planetary gear is 560 mm, and the diameter of the planetary gear tooth root 112 is 578 mm. The small end 212 of the backing plate 21 is equivalent to a positioning boss. The diameter of the small end 212 should be determined according to the state of the planetary gear. When there is a bearing 12 in the inner hole of the planetary gear, the diameter of the small end 212 is smaller than the inner diameter of the planetary gear bearing 12; when there is no bearing 12 installed in the inner hole of the planetary gear, the diameter of the small end 212 is smaller than the inner diameter of the planetary gear. In this embodiment, the small end 212 on the pad 21 has a diameter of 258mm, and a bearing 12 with an inner diameter of 260mm is installed in the inner hole of the planetary gear. A threaded hole penetrating the pad 21 is opened at the center of the pad 21 for installing the double-ended screw 23, and the threaded hole specification is M24-7H.

[0029] The pressure plate 22, which is arranged opposite to the pad 21, is roughly the same in structure as the pad 21. The only difference is that the pressure plate 22 has a through hole with a diameter of 26mm in the center. In addition, there are two threaded holes for lifting protective fixtures symmetrically arranged on the pressure plate 22, in which lifting rings are threaded and installed.

[0030] The usage procedure for end face protection device 2 is as follows:

[0031] S1. Place the pad 21 on the ground;

[0032] S2. Use a crane to lift the planetary gear, use the small end 212 on the pad 21 to align the inner hole of the planetary gear for positioning, and place the planetary gear on the pad 21;

[0033] S3. Screw one end of the double-ended screw 23 into the threaded hole in the center of the pad 21;

[0034] S4. Use a crane to lift the pressure plate 22, use the small end 212 on the pressure plate 22 to align with the inner hole of the planetary gear for positioning, place the pressure plate 22 on the upper end face of the planetary gear, and at the same time, the end of the double-ended screw 23 away from the pad 21 passes through the through hole on the pressure plate 22.

[0035] S5. Thread the nut 24 onto the end of the double-ended screw 23 that protrudes from the pressure plate 22, and tighten the nut 24 to lock the pressure plate 22;

[0036] S6. Install the lifting eye thread onto the pressure plate 22, and then the whole unit can be lifted.

[0037] The tooth surface protection device 3 consists of tape 32, V-shaped sheet 31, and wire 33;

[0038] The V-shaped piece 31 is formed by bending an iron sheet. The height of the bent V-shaped piece 31 should be 20-30mm greater than the width of the planetary gear teeth. The thickness of the V-shaped piece 31 is 0.8-1mm. Depending on actual use, V-shaped pieces 31 with a thickness greater than 1.2mm are difficult to hammer, while those less than 0.6mm are prone to deformation during hammering. In this embodiment, the thickness of the V-shaped piece 31 is uniformly 1mm. The angle of the bent V-shaped piece 31 should be 2-3° less than the pressure angle of the planetary gear, so that the V-shaped piece 31 can be securely fastened to the teeth 11 of the planetary gear. Adhesive tape 32 is pasted along the edge of the V-shaped piece 31 on the tooth surface 111. After inserting the V-shaped piece 31 into each tooth of the planetary gear, all the V-shaped pieces 31 are bound together with wire 33.

[0039] The specific usage procedure for tooth surface protection device 3 is as follows:

[0040] S1. Measure the tooth thickness at the tip of the planetary gear teeth that need to be shot peened on site, and find a round bar of the same diameter based on the measurement results.

[0041] S3. Place the round bar in the center of an iron sheet and gently tap the iron sheet with a hammer to bend it into a V-shaped piece 31, making it involute. After tapping, insert it into the tooth 11 and observe the fit with the tooth surface 111. Decide whether to tap it again based on the fit until the V-shaped piece 31 can be stably and securely fixed to the tooth 11 of the planetary gear. After testing, when the angle of the V-shaped piece 31 after bending is less than the pressure angle of the planetary gear by 2-3°, it is easy to meet the requirements.

[0042] S4. The V-shaped plate 31 and the tooth surface 111 of the planetary gear cannot be completely fitted together, and there is a certain gap. Therefore, tape 32 should be pasted on the tooth surface 111 along the edge of the V-shaped plate 31 to completely cover the exposed gap.

[0043] S5. After inserting V-shaped pieces 31 into each tooth of the planetary gear, use wire 33 to bind all the V-shaped pieces 31 together to prevent them from falling off during shot peening.

[0044] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A planetary wheel shot peening tooling, characterized by: The end face protection device and the tooth face protection device are provided. The end face protection device comprises oppositely arranged backing plate and pressing plate, double-end screw threadedly connected with the backing plate and the pressing plate respectively, and nut for locking the pressing plate. The tooth face protection device comprises several V-shaped pieces and adhesive tape, the thickness of the V-shaped pieces is 0.8mm-1mm, and the included angle of the V-shaped pieces is less than the pressure angle of the planetary gear 2°-3°.

2. The planetary wheel shot peening tooling of claim 1, wherein: A through hole is arranged in the center of the pressing plate for the double-end screw to pass through.

3. A planetary wheel shot peening tooling according to claim 2, wherein: The tooth face protection device further comprises steel wire for bundling the several V-shaped pieces together.

4. A planetary wheel shot peening tooling according to claim 3, wherein: The width of the V-shaped pieces is greater than the tooth width of the planetary gear 20-30mm.

5. A planetary wheel shot peening tooling according to claim 4, wherein: A lifting ring is fixedly arranged on the pressing plate.

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