Integral helical gear case

Abstract

The utility model relates to gear box technical field, especially integrative helical gear box, the utility model discloses a box body, bottom plate, output shaft, ball bearing, planet carrier, planetary gear, gear shaft, the inside forming of box body has the helical internal tooth, and the planetary gear is engaged with helical internal tooth, the utility model discloses reduced assembly technology, increased reliability and structural strength, eliminated the assembly cumulative error of split structure, significantly promoted the operation accuracy, effectively reduced the working noise, while keeping the cost performance, greatly enhanced the long-term reliability and batch consistency of product.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to an integrated helical gearbox. Background Technology

[0002] In the wave of continuous and in-depth development of industrial automation, efficient and reliable power solutions have become key to the upgrading and transformation of various industries. As the core power transmission and drive unit of automated equipment, the importance of micro gearboxes and geared motors is increasingly prominent. With the market's increasingly stringent requirements for gear transmission performance, particularly in terms of noise control, service life, operational reliability, product quality, and cost-effectiveness, the existing Φ60mm planetary gearbox is gradually becoming insufficient to meet customers' ever-increasing expectations. Through long-term application practice, this older structure has revealed certain areas for optimization and improvement.

[0003] Based on customer installation tests and market feedback analysis, the Φ60MM planetary gearboxes currently on the market still have the following shortcomings in terms of sealing performance, transmission stability, noise control, and service life, see [link to relevant documentation]. Figure 1 , 2 .

[0004] First, the sealing issue at the mating point between output shaft 04 and ball bearing 05. Poor sealing at this point leads to two main problems: first, lubricating grease leakage; and second, the entry of external contaminants into the gearbox. Lubricating grease leakage results in insufficient gear lubrication, accelerating gearbox wear and polluting the environment. External contaminants entering the gearbox exacerbate corrosion and wear of internal gears and other components, shortening the gearbox's lifespan. This is especially problematic in humid environments or high-dust gate applications, where the risk of failure due to environmental factors is even higher.

[0005] Second point: Axial movement of output shaft 04. Structurally, the older gearbox design only used a retaining circlip 09 to fix the ball bearing 05, lacking a preload adjustment mechanism. This resulted in inherently large axial clearance in the ball bearing 05. Large axial clearance in output shaft 04 leads to abnormal gearbox noise and accelerates wear on related components and the ball bearing 05.

[0006] Thirdly, regarding the support issue of ball bearing 05, the older gearbox structure had a smaller installation distance between the two ball bearings 05 in the output section, resulting in a shorter radial support arm for the output shaft 04. Therefore, the gearbox could only withstand lower radial loads, limiting its application and making it difficult to meet customer needs, thus reducing its adaptability and practicality.

[0007] Fourth point: Wear issues. The old gearbox structure has several easily worn components: 1. Wear between the inner bore of planetary gear 07 and gear shaft 08. The frictional resistance between the mating surfaces of the inner bore of planetary gear 07 and gear shaft 08 is relatively high, leading to easy wear of the inner bore of planetary gear 07. Wear on planetary gear 07 can cause runout during gearbox operation, resulting in significantly increased abnormal noise and vibration. 2. Wear between planetary gear 07 and planet carrier 06. In the old gearbox structure, planetary gear 07 is in direct contact with planet carrier 06, and both the end faces of planet carrier 06 and planetary gear 07 have relatively high roughness. During gearbox operation, planetary gear 07 is extremely prone to wear on the end face of planet carrier 06 under high-speed rotation. The worn end face generates greater running resistance, leading to a decrease in gearbox transmission efficiency.

[0008] Fifthly: The issue of the separate structure of the plastic helical internal gear 03 with the housing 01 and base plate 02. In the old gearbox design, the plastic internal gear 03 was designed as a separate unit from the housing 01 and base plate 02. Plastic material has low strength and fatigue resistance, making the plastic helical internal gear 03 prone to deformation, wear, and even breakage under long-term high loads during operation. Furthermore, the separate assembly makes it difficult to ensure the coaxiality of the plastic helical internal gear 03 and the housing 01. After assembly, misalignment between the plastic helical internal gear 03 and the housing 01 is likely to occur, causing noticeable wobble and abnormal noise during gearbox operation. This wobble also exacerbates friction between the plastic helical internal gear 03 and the housing 01, further shortening the gearbox's service life.

[0009] Based on more than ten years of experience and technical expertise in gearbox design, development and precision manufacturing, the applicant has carried out a comprehensive innovation and upgrade of the existing Φ60MM outer diameter gearbox and successfully developed a new generation of Φ60MM outer diameter gearbox, for which this patent application is hereby filed. Utility Model Content

[0010] The purpose of this utility model is to provide an integrated helical gearbox to address the shortcomings of existing technologies. This integrated helical gearbox solves the defects of existing gearboxes, such as short service life.

[0011] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0012] An integrated helical gearbox includes a housing, a base plate, an output shaft, ball bearings, a planetary carrier, planetary gears, and a gear shaft; the housing has internally formed helical internal teeth, which mesh with the planetary gears.

[0013] Furthermore, the housing has an internal gear bearing fixing boss, and a ball bearing is installed on each side of the internal gear bearing fixing boss to increase the axial distance between the two ball bearings at the output end.

[0014] Furthermore, a wave spring washer is provided between the locating end face of the ball bearing located on the rear side and the fixing boss of the internal gear bearing. This improves operational stability, reduces bearing wear and impact damage, and significantly extends the bearing's service life.

[0015] Furthermore, a bushing is provided between the two ball bearings to assist in the installation of the ball bearings and increase the axial distance between the two ball bearings.

[0016] Furthermore, a needle roller bearing is installed inside the inner bore of the planetary gear, and the needle roller bearing is sleeved on the gear shaft. This changes sliding friction to rolling friction, effectively reducing wear, extending the service life of the gearbox, and enhancing the torque-carrying capacity of the planetary gear.

[0017] Furthermore, a sealing groove is radially formed at the mating point between the output shaft and the ball bearing, and an O-ring is fitted into the sealing groove. This effectively prevents lubricating grease from leaking out of the gearbox, prevents external contaminants from entering the gearbox, and extends the gearbox's lifespan.

[0018] Furthermore, a planetary carrier shim is provided between the planetary gear and the planetary carrier. This reduces frictional resistance and increases the lifespan of both the planetary gear and the planetary carrier.

[0019] The beneficial effects of this utility model are: it reduces assembly processes, increases reliability and structural strength, eliminates the cumulative assembly error of split structures, significantly improves operating accuracy, effectively reduces working noise, and greatly enhances the long-term reliability and batch consistency of the product while maintaining cost-effectiveness. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of an existing gearbox.

[0021] Figure 2 This is an exploded view of the existing gearbox structure.

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 4 This is an exploded view of the structure of this utility model.

[0024] Labels and explanations:

[0025] 01. Housing; 02. Base plate; 03. Plastic helical internal gear; 04. Output shaft; 05. Ball bearing; 06. Planetary carrier; 07. Planetary gear; 08. Gear shaft; 09. Hole snap ring.

[0026] 1. Housing; 2. Base plate; 3. Helical internal gear; 4. Output shaft; 5. Ball bearing; 6. Planetary carrier; 7. Planetary gear; 8. Gear shaft; 9. Wave spring washer; 10. Sealing groove; 11. O-ring seal; 12. Bushing; 13. Needle roller bearing; 14. Planetary carrier washer. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] See Figure 3 , Figure 4 The integrated helical gearbox of this utility model includes: a housing 1, a base plate 2, helical internal gears 3, an output shaft 4, a ball bearing 5, a planetary carrier 6, planetary gears 7, a gear shaft 8, a wave spring washer 9, a sealing groove 10, an O-ring seal 11, a bushing 12, a needle roller bearing 13, and a planetary carrier washer 14.

[0029] The improvements made in this utility model are as follows:

[0030] Improvement point 1: Add a radial sealing groove and an O-ring to the mating point between the output shaft 1 and the ball bearing 2;

[0031] Improvement point 2: Eliminate the hole retaining ring and replace it with an internal gear bearing to fix the boss and position the ball bearing 2, and increase the axial distance between the two ball bearings 2 at the output end;

[0032] Improvement point 3: Add wave spring washer 9 between ball bearing 2 and internal gear bearing fixing boss, and add bushing 12 between the two ball bearings 2;

[0033] Improvement point 4: Add needle roller bearing 13 at the center hole of planetary gear 7;

[0034] Improvement point 5: Add planet carrier shim 14 between planetary gear 7 and planet carrier 6;

[0035] Improvement point 6: The helical internal gear and the housing have been changed from a separate structure to an integrated structure.

[0036] The specific structure is as follows:

[0037] A radial sealing groove 10 and an O-ring 11 are added at the mating point between the output shaft 1 and the ball bearing 2. This structure can effectively prevent the lubricating grease inside the gearbox from leaking outward, avoiding environmental pollution and the risk of equipment oil shortage. At the same time, it can reliably prevent external pollutants from entering the gearbox, significantly improving the gearbox's protection level and reliability in various environments and extending the gearbox's lifespan.

[0038] The housing 1 of this invention features an internal gear bearing fixing boss. Two ball bearings 2 are located on either side of the fixing boss. A wave spring washer 9 is added to the positioning end face of the ball bearing 2 on the rear side and the fixing boss to provide a continuous, flexible axial preload. This preload effectively eliminates the initial clearance inside the bearing and compensates for minor clearance changes caused by temperature variations and various types of wear during operation. This significantly reduces abnormal noises caused by bearing movement during gearbox start-up, reversing, or sudden load changes, improving operational smoothness and user experience. Simultaneously, the stable preload reduces bearing wear and impact damage, significantly extending bearing service life.

[0039] This invention uses an internal gear bearing to fix a boss and position a ball bearing 2. A bushing 12 is set between the two ball bearings 2 to increase the axial distance between the two ball bearings 2 at the output end. Firstly, this improves the rigidity of the output shaft 1 and reduces shaft deflection. With the increased bearing distance, the equivalent bending stiffness of the output shaft 1 increases, reducing the bending deformation of the output shaft 1 when transmitting torque. Secondly, it helps reduce the local load on the ball bearings 2. The increased bearing distance allows the radial load to be distributed more evenly on the two ball bearings 2, increasing the radial load capacity and extending the life of the ball bearings 2. Thirdly, the larger bearing distance increases the natural frequency of the output shaft 1, reducing the risk of resonance, and simultaneously reducing the amplitude of the flexible vibration of the output shaft 1. During high-speed transmission, this helps reduce the vibration and noise of the output shaft 1, improving the load-bearing capacity, lifespan, and reliability of the gearbox.

[0040] This invention incorporates a needle roller bearing 13 into the inner bore of the planetary gear 7. This changes sliding friction to rolling friction, effectively reducing wear between the inner bore of the planetary gear 7 and the gear shaft 8, and extending the service life of the gearbox. At the same time, the structure of the needle roller bearing 13 suppresses the runout problem of the planetary gear 7, making the transmission operation smoother, reducing noise, and enhancing the torque carrying capacity of the planetary gear 7.

[0041] This invention adds a planetary carrier shim 14 between the planetary gear 7 and the planetary carrier 6. The planetary carrier shim 14 is made of hardened stainless steel with low surface roughness. After the improvement, the planetary gear 7 changes from direct friction with the planetary carrier 6 to friction with the planetary carrier shim with high hardness and smooth surface, which reduces frictional resistance and increases the service life of the planetary gear 7 and the planetary carrier 6.

[0042] In this invention, the gearbox housing 1 is changed to a one-piece structure, with helical internal teeth 3 formed inside the housing 1, and planetary gears 7 meshing with the helical internal teeth 3. Firstly, this reduces assembly processes and improves production efficiency; secondly, the one-piece structure increases reliability and structural strength, provides a more direct torque transmission path, avoids the risk of loosening associated with split structures, and extends the service life of the gearbox; thirdly, it eliminates the accumulated assembly errors of split structures, improves meshing smoothness, and reduces noise and other problems caused by poor assembly.

[0043] This utility model is mainly applied to industrial automation fields such as subway station switch valves, logistics sorting line turning mechanisms, fire dampers in fire protection systems, and packaging machinery.

[0044] Of course, the above-described embodiments are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An integrated helical gearbox, characterized in that: It includes a housing, base plate, output shaft, ball bearings, planetary carrier, planetary gears, and gear shafts; the housing has helical internal gears formed inside, and the planetary gears mesh with the helical internal gears; The housing has an internal gear bearing fixing boss, and a ball bearing is installed on each side of the internal gear bearing fixing boss. The planetary gear has a needle roller bearing inside its inner hole, and the needle roller bearing is sleeved on the gear shaft. The output shaft and the ball bearing mating area are formed with a sealing groove in the radial direction, and an O-ring is fitted into the sealing groove. A planetary carrier shim is provided between the planetary gear and the planetary carrier.

2. The integrated helical gearbox according to claim 1, characterized in that: A wave spring washer is provided between the positioning end face of the ball bearing located on the rear side and the fixing boss of the internal gear bearing.

3. The integrated helical gearbox according to claim 1, characterized in that: A bushing is provided between the two ball bearings.

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