Output shaft assembly for miniature speed reducer
By combining stamping outer ring needle roller bearings and deep groove ball bearings in the micro reducer, and introducing powder metallurgical stops and HRC50-60 materials, the insufficient load-bearing capacity, positioning accuracy and axial force response capabilities of traditional micro reducers are solved. The problem is that higher load-bearing capacity, accuracy and wear resistance are achieved, and are suitable for miniaturization, high-precision and high-performance application scenarios.
Patent Information
- Application Number
- CN202421003312.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-05-10
AI Technical Summary
Traditional micro reducers have shortcomings in load-bearing capacity, positioning accuracy, axial force response capability and energy consumption, especially when facing large loads and high torque conditions, gear slippage, bearing damage, insufficient positioning accuracy, and axial impact. and high energy consumption.
A output shaft assembly for miniature reducer is designed, using stamping outer ring needle roller bearings and deep groove ball bearings to protect stamping outer ring needle roller bearings through powder metallurgy stops to improve radial and axial load bearings. Ability and enhance wear resistance and compressive strength through materials with hardness HRC50-60.
It significantly improves load-bearing capacity and positioning accuracy, enhances the ability to cope with axial forces, optimizes space utilization, extends the service life of the equipment, and reduces energy consumption, meeting the needs of miniaturization, high precision and high efficiency. .
Smart Images
Figure CN222122170U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of micro reducers, and in particular relates to an output shaft assembly for a micro reducer. Background Art
[0002] As a precision power transmission device, micro reducers are widely used in robots, automation equipment, precision instruments, medical equipment, aerospace and other fields. Its core function is to convert the high-speed rotation energy generated by the motor or other power source into the required low-speed rotation through the transmission of multi-stage gear pairs, while greatly improving the output torque to meet the equipment's needs for small size, high torque, precise control and low noise. With the continuous development of science and technology and the upgrading of market demand, the performance requirements for micro reducers are becoming more and more stringent, especially in terms of high-precision positioning, large load bearing, high-efficiency operation and miniaturized integration.
[0003] However, although the existing micro reducers meet the basic requirements of speed reduction and torque increase to a certain extent, with the expansion of application fields and the increase of technical challenges, traditional micro reducers have exposed obvious disadvantages in the following aspects: Load capacity limitation: Due to the limitations of design, materials and manufacturing processes, traditional micro reducers often have difficulty in providing sufficient load capacity while maintaining a small size. When facing large load and high torque conditions, problems such as gear slippage, bearing damage, and housing deformation may occur, affecting the stability and reliability of the equipment. Insufficient positioning accuracy: The gear clearance, bearing clearance and assembly error of traditional micro reducers may cause a large backlash at the output end, affecting the positioning accuracy and repeatability of the equipment, which is a serious constraint for application scenarios such as precision machining and high-precision positioning. Weak axial force coping ability: Many traditional micro reducers did not fully consider the influence of axial force at the beginning of their design, or only relied on a single bearing structure to cope with axial loads, resulting in the bearings failing easily when facing axial shock, vibration or heavy load in actual applications, and even causing the overall damage of the transmission system. High energy consumption: Traditional micro reducers have large internal friction losses, poor lubrication conditions, and low transmission efficiency, which increases motor energy consumption and does not meet the requirements of modern industry for energy conservation, emission reduction, and green manufacturing. Low space utilization: The internal layout of traditional micro reducers may be unreasonable, resulting in the size of some key components such as bearings being limited, and unable to fully utilize their load-bearing potential, while also limiting the miniaturization of the overall structure. Utility Model Content
[0004] In view of this, the utility model provides an output shaft assembly for a micro reducer, which solves the problem of coping with radial force.
[0005] The utility model is achieved in this way:
[0006] The utility model provides an output shaft assembly for a micro reducer, which includes a box body, an integrated output shaft and a box cover matching the box body, the integrated output shaft is arranged inside the box body, a stamped outer ring needle roller bearing is arranged on the side of the integrated output shaft close to the box cover, a powder metallurgy stopper is arranged between the integrated output shaft and the stamped outer ring needle roller bearing, the powder metallurgy stopper is fixedly arranged on the integrated output shaft, and a deep groove ball bearing is arranged on the other side of the integrated output shaft.
[0007] When subjected to radial force, the deep groove ball bearing is the fulcrum bearing, and the stamped outer ring needle roller bearing is the force bearing of the force arm, which bears a large radial force. Therefore, the original small-sized deep groove ball bearing here cannot withstand and there is no space to replace it with a larger deep groove ball bearing.
[0008] When there is axial force, the stamped outer ring needle roller bearing (which cannot bear axial force) is protected by the powder metallurgy block and can bear a certain axial force. The output shaft is used as the inner ring of the bearing, and the hardness is HRC50-60 to improve the wear resistance.
[0009] On the basis of the above technical solution, the output shaft assembly for a micro reducer of the utility model can also be improved as follows:
[0010] Wherein, there are multiple powder metallurgy blocks.
[0011] Furthermore, there are two powder metallurgy blocks, which are located at symmetrical positions on the left and right sides of the central axis of the stamped outer ring needle roller bearing.
[0012] Furthermore, the diameter of the integrated output shaft is between 12 mm and 16 mm.
[0013] Furthermore, the integrated output shaft serves as the inner ring of the deep groove ball bearing and the stamped outer ring needle roller bearing, and its hardness is HRC50-60.
[0014] The beneficial effects of adopting the above improvement scheme are: High hardness: The hardness of HRC50-60 is much higher than that of most ordinary carbon steel and alloy steel that have not been heat treated. The hardness of these materials is usually between HRC20-35. This means that materials with a hardness of HRC50-60 can withstand stronger external mechanical stress without significant plastic deformation, which is crucial for applications that require high strength and high wear resistance, such as cutting tools, molds, bearings, and wear-resistant parts;
[0015] Good wear resistance: Hardness is closely related to wear resistance. The higher the hardness, the stronger the material surface's ability to resist wear. Therefore, when a material with a hardness of HRC50-60 comes into contact with other hard materials or abrasive particles, its surface is not easily scratched or worn, and is suitable for manufacturing parts that are subject to severe wear conditions;
[0016] High compressive strength: High hardness is usually accompanied by high compressive strength, which means that the material can withstand large compressive loads without breaking. For engineering parts that need to withstand high pressure, impact or heavy loads, such as piston rods in hydraulic systems and wear-resistant liners for mining machinery, the hardness level of HRC50-60 provides the necessary strength guarantee.
[0017] Furthermore, the deep groove ball bearing and the stamped outer ring needle roller bearing are arranged in sequence along the axial direction of the output shaft, and an axial spacing is provided between the two.
[0018] Furthermore, the outer ring of the stamped outer ring needle roller bearing is manufactured by a stamping process.
[0019] Compared with the prior art, the utility model provides a beneficial effect of a micro reducer output shaft assembly:
[0020] Significantly enhanced load-bearing capacity: By replacing the original small-sized deep groove ball bearings with stamped outer ring needle roller bearings, the radial load-bearing capacity is increased by at least two times. The stamped outer ring needle roller bearings can achieve a significant increase in load-bearing capacity within a limited space due to their large contact area between the needle roller and the raceway and high load per unit area, meeting the needs of large load and high torque applications;
[0021] Improve positioning accuracy: Although the deep groove ball bearings are replaced, the overall rigidity and stability of the shaft bearing structure are still maintained through reasonable configuration and design, effectively suppressing the additional backlash that may be caused by bearing replacement, ensuring that the positioning accuracy of the micro reducer is not affected;
[0022] Enhanced axial force handling capability: Powder metallurgy block is introduced to bear axial force and protect stamped outer ring needle roller bearings from axial load. This structural design fully utilizes the high radial load-bearing advantage of stamped outer ring needle roller bearings and properly solves the problem that they are not good at bearing axial force, significantly improving the ability of the micro reducer to handle axial force;
[0023] Optimize space utilization and compact structure: The stamped outer ring needle roller bearing is lightweight and compact because its outer ring is manufactured by stamping process. It can achieve high load-bearing capacity in a limited space, which is conducive to the miniaturization design of micro reducers. At the same time, the use of powder metallurgy blocks also reflects the effective use of space, avoiding the significant increase in overall volume due to increasing axial load-bearing capacity;
[0024] Improve wear resistance and extend service life: The integrated output shaft is made of material with a hardness of HRC50-60, which significantly improves the wear resistance of the inner ring of the bearing and reduces the transmission error caused by wear, thereby helping to maintain the accuracy and stability of the micro reducer in long-term operation and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0026] Figure 1 This is an example diagram of an output shaft assembly for a micro reducer;
[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0028] 1. Box body; 2. Integrated output shaft; 3. Powder metallurgy block; 4. Stamped outer ring needle roller bearing; 5. Deep groove ball bearing. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the implementation mode of the present invention clearer, the technical solution in the implementation mode of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation mode of the present invention.
[0030] like Figure 1 As shown, it is a first embodiment of an output shaft assembly for a micro reducer provided by the utility model. In this embodiment, it includes a housing 1, an integrated output shaft 2 and a housing cover matching the housing 1. The integrated output shaft 2 is arranged inside the housing 1. A stamped outer ring needle roller bearing 4 is arranged on the side of the integrated output shaft 2 close to the housing cover. A powder metallurgy stopper 3 is arranged between the integrated output shaft 2 and the stamped outer ring needle roller bearing 4. The powder metallurgy stopper 3 is fixedly arranged on the integrated output shaft 2. A deep groove ball bearing 5 is arranged on the other side of the integrated output shaft 2.
[0031] Among them, in the above technical solution, there are multiple powder metallurgy blocks 3.
[0032] Furthermore, in the above technical solution, there are two powder metallurgy blocks 3, which are respectively located at symmetrical positions on the left and right sides of the central axis of the stamped outer ring needle roller bearing 4.
[0033] Furthermore, in the above technical solution, the diameter of the integrated output shaft 2 is between 12 mm and 16 mm.
[0034] Furthermore, in the above technical solution, the integrated output shaft 2 serves as the inner ring of the deep groove ball bearing 5 and the stamped outer ring needle roller bearing 4, and its hardness is HRC50-60.
[0035] Hardness of HRC50-60 is an index of mechanical properties of materials, specifically Rockwell Hardness Scale measurement values falling between 50 and 60. Rockwell hardness test is a widely used hardness measurement method used to evaluate the ability of metal materials to resist permanent deformation (especially indentation deformation). HRC is the reading of the Rockwell hardness tester C scale, which is mainly used to measure the hardness of hard materials such as hardened steel and cemented carbide.
[0036] The Rockwell hardness test is performed by applying a specific preload (usually 98.07 N), then applying the main load (for the HRC scale, the main load is 1471.1 N), removing the main load, and finally measuring the depth of the indentation left by the indenter (for the HRC scale, a 120° diamond cone indenter is used) on the material surface. The smaller the indentation depth, the harder the material. The hardness value HRC is calculated from the displacement of the indenter after rebound. The larger the value, the higher the hardness of the material.
[0037] Furthermore, in the above technical solution, the deep groove ball bearing 5 and the stamped outer ring needle roller bearing 4 are arranged in sequence along the axial direction of the output shaft, and an axial spacing is provided between the two.
[0038] Furthermore, in the above technical solution, the outer ring of the stamped outer ring needle roller bearing 4 is manufactured by a stamping process.
[0039] The specific contents of the stamping process of stamped outer ring needle roller bearings are as follows:
[0040] Raw material preparation: Select thin steel plates suitable for stamping as the outer ring material. The thickness, material and surface quality must meet the strength, wear resistance and fatigue life requirements of the needle roller bearing outer ring.
[0041] Mold design and manufacturing: Design a special stamping mold, including punch, die, stripper plate, ejector mechanism and other components. The mold should accurately simulate the geometry and dimensional tolerance of the outer ring of the needle roller bearing to ensure the accuracy of the outer ring after stamping. Strict heat treatment and surface treatment are required during the mold manufacturing process to ensure the hardness, wear resistance and service life of the mold.
[0042] Blanking process: Use a blanking die to perform the initial blanking of the thin steel plate to obtain a circular blank that matches the outer ring profile, ensuring that the blank size is accurate and the edge is smooth and free of burrs.
[0043] Stretching forming process: the blank is placed in the stretching die, and the press machine applies tensile stress perpendicular to the plane of the sheet, so that the blank gradually undergoes plastic deformation along the die cavity to form an outer ring shape with features such as raceways, ribs and mounting holes. In this process, the guide structure of the die ensures that all parts of the outer ring are evenly stressed to avoid wrinkles or cracks.
[0044] Trimming process: Trim the outer ring to remove excess material, such as burrs and flash, to ensure that the edge of the outer ring is smooth and has no sharp corners to prevent damage to the needle roller or other adjacent components during assembly.
[0045] Heat treatment process: The outer ring after stamping is subjected to necessary heat treatment, such as quenching and tempering, to improve its hardness, wear resistance and inherent stability, and ensure that it has sufficient load-bearing capacity and fatigue resistance under working conditions.
[0046] Surface treatment process: The outer ring is subjected to surface anti-corrosion or strengthening treatment, such as plating, painting, phosphating, oxidation, etc., to improve its corrosion resistance, wear resistance or appearance quality. For special application environments, it may also be necessary to apply a lubricating coating to reduce initial wear after assembly and improve lubrication during operation.
[0047] Specifically, the principle of the utility model is:
[0048] Selection and configuration of high-load bearings: Use stamped outer ring needle roller bearings to replace the original small-sized deep groove ball bearings, and use the higher load-bearing capacity of needle roller bearings under the same volume to effectively improve the radial load limit of the micro reducer. Through reasonable layout, ensure that the stamped outer ring needle roller bearing is the main radial force bearing component, and the deep groove ball bearing is used as a fulcrum bearing for auxiliary load bearing. The two work together to achieve a balance between high load-bearing capacity and structural stability;
[0049] Axial force protection and dispersion mechanism: Powder metallurgy block is introduced as a component specifically for dealing with axial force. When axial force acts on the shaft bearing structure, the block directly bears and disperses the force, preventing it from being directly transmitted to the stamped outer ring needle roller bearing that is not good at bearing axial force, thereby protecting the needle roller bearing from damage and ensuring the stable operation of the entire transmission system;
[0050] Wear resistance improvement and life extension strategy: adopt an integrated output shaft and increase its hardness to HRC50-60 to ensure that the inner ring of the bearing has high wear resistance. This design reduces the wear between the inner ring of the bearing and the needle roller, reduces the increase in internal clearance caused by wear, and thus maintains the accuracy and stability of the micro reducer, extending the service life of the equipment;
[0051] Application of stamping technology in bearing outer ring: The outer ring of stamped outer ring needle roller bearing is manufactured by stamping technology, which uses the plastic deformation of metal sheets and one or more continuous stamping processes to achieve lightweight and high-precision manufacturing of the outer ring. The stamping process not only saves materials and reduces costs, but also ensures the geometric accuracy and surface quality of the outer ring, which is conducive to improving the overall performance of the bearing and the compactness of the micro reducer.
Claims
1. An output shaft assembly for a micro reducer, characterized in that: The invention comprises a housing (1), an integrated output shaft (2) and a housing cover matching the housing (1); the integrated output shaft (2) is arranged inside the housing (1); a stamped outer ring needle roller bearing (4) is arranged on the side of the integrated output shaft (2) close to the housing cover; a powder metallurgy block (3) is arranged between the integrated output shaft (2) and the stamped outer ring needle roller bearing (4); the powder metallurgy block (3) is fixedly arranged on the integrated output shaft (2); and a deep groove ball bearing (5) is arranged on the other side of the integrated output shaft (2).
2. The output shaft assembly for a micro reducer according to claim 1, characterized in that: There are a plurality of powder metallurgy blocks (3).
3. The output shaft assembly for a micro reducer according to claim 2, characterized in that: There are two powder metallurgy blocks (3), which are respectively located at symmetrical positions on the left and right sides of the central axis of the stamped outer ring needle roller bearing (4).
4. The output shaft assembly for a micro reducer according to claim 3, characterized in that: The diameter of the integrated output shaft (2) is between 12 mm and 16 mm.
5. The output shaft assembly for a micro reducer according to claim 4, characterized in that: The integrated output shaft (2) serves as the inner ring of the deep groove ball bearing (5) and the stamped outer ring needle roller bearing (4), and its hardness is HRC50-60.
6. The output shaft assembly for a micro reducer according to claim 5, characterized in that: The deep groove ball bearing (5) and the stamped outer ring needle roller bearing (4) are arranged in sequence along the axial direction of the output shaft, and an axial spacing is provided between the two.
7. The output shaft assembly for a micro reducer according to claim 6, characterized in that: The outer ring of the stamped outer ring needle roller bearing (4) is manufactured by a stamping process.