Products
Robot Reducer Internal Gear Ring
Internal gear ring of robot reducer | Core component of precision fixed gear ring
High-precision internal gear ring | Rigid support and precision meshing reference | Ensures stable, efficient, and high-precision transmission in robot joint reduction systems.
We specialize in the research and precision manufacturing of internal gear rings (or internal gear assemblies), a key fixed component in robot joint planetary reducers and RV reducers. We provide professional solutions that integrate ultra-high tooth profile accuracy, excellent structural rigidity, thermal stability, and wear resistance. As the "fixed skeleton" and "final output reference" of the reducer, our internal gear rings provide rigid spatial constraints for the precise meshing of planetary gears or cycloidal gears, which is crucial for achieving high transmission accuracy, low backlash, and long service life.
Core Advantages
(1) Ultra-high precision internal tooth profile manufacturin
① Adopting precision broaching, gear shaping followed by fine grinding or honing processes, the internal tooth precision can reach DIN grade 4 (or AGMA grade 12) or above, with a cumulative pitch error ≤0.008mm
② Special tooth profile and tooth direction modification is performed for the high dynamic working conditions of robot joints to optimize the meshing contact area and reduce impact and noise
③ The internal tooth surface is ultra-fine polished, with a roughness Ra≤0.2μm, which significantly reduces friction and wear and improves transmission efficiency.
(2) Ultra-high rigidity integral structure
① High-strength alloy steel or cast iron is used for integral molding, and with optimized reinforcing rib layout, the overall rigidity is increased by 40% compared with the traditional design, effectively suppressing the deformation caused by meshing force.
② The key mounting flange face and the internal tooth datum are clamped and machined in one go to ensure that the end face runout and the coaxiality of the internal tooth pitch circle are ≤0.01mm, ensuring the assembly accuracy of the whole machine.
③ The wall thickness and stress distribution are optimized through finite element analysis to achieve the best balance between lightweight and deformation resistance.
(3) Excellent thermal stability and dimensional retention
① The material undergoes multi-stage stabilization treatment (such as vibration aging and cryogenic treatment) to fully release residual stress, improving long-term dimensional stability by 60%.
② Wide operating temperature range (-40℃ to +120℃), with precisely matched coefficients of thermal expansion to ensure the fit accuracy with other components during temperature changes.
③ Special coatings are available (such as DLC, WS2) to reduce frictional heat generation and enhance heat dissipation, maintaining low-temperature operation.
(4) Long life, wear resistance and fatigue resistance design
① The internal gear surface is deep carburized, nitrided or induction hardened, with a surface hardness of HRC58-62, increasing the wear resistance life by more than 3 times
② The tooth root fillet is reinforced by shot peening to improve bending fatigue strength and fatigue resistance life ≥10⁸ cycles
③ "Matching pairs" are provided to ensure optimal meshing performance and the longest service life.
Technical Specifications
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Parameter categories |
Specifications |
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Applicable types of speed reducers |
Planetary gear reducer (fixed internal gear ring), RV gear reducer (second stage pin gear housing/internal gear ring), cycloidal pinwheel reducer |
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Common materials |
42CrMo (high-strength alloy steel), GCr15 (bearing steel), HT250/300 (high-strength gray cast iron), stainless steel (corrosion resistant). |
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Modulus range |
Small: 0.5-1.5, Medium: 1.5-3.5, Large: 3.5-8.0 (Non-standard customization available) |
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Tooth count range |
The common tooth count ranges from 30 to 150 teeth, customized according to the speed ratio and structure. |
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Accuracy level |
DIN 4-6, AGMA 12-14, JIS 1-3 (DIN 3 grade ultra-high precision customization available) |
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Heat treatment process |
Carburizing and quenching (mainstream), nitriding, induction hardening, overall tempering, surface hardness HRC58-62 |
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Key coordination features |
The mounting stop accuracy is H6/H7, the end face flatness is ≤0.01mm, and the coaxiality between the internal gear pitch circle and the mounting datum is ≤0.015mm. |
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Lubrication and sealing |
Integrated lubrication oil hole/slot, with optional sealing groove (for mounting O-rings or rotary oil seals). |
Key performance indicators
① Cumulative pitch error of internal teeth : ≤ 0.008mm (DIN Grade 4 precision core indicator)
② Surface roughness of internal teeth : Ra ≤ 0.4μm after fine grinding, Ra ≤ 0.2μm after ultra-fine honing
③ Surface hardness and hardened layer : Surface hardness HRC58-62, effective hardened layer depth 0.6-1.2mm (CHD)
④ Mounting datum accuracy : End face flatness ≤ 0.01mm, stop roundness ≤ 0.008mm
⑤ Geometric tolerance : Coaxiality of internal tooth pitch circle and mounting stop ≤ 0.015mm, perpendicularity to end face ≤ 0.01mm
⑥ Overall thermal deformation coefficient : Within the rated operating temperature rise range, the change in internal tooth pitch circle diameter ≤ 0.005mm
⑦ Fatigue life : Under rated load and speed, tooth surface contact fatigue life ≥ 5×10⁷ cycles
⑧ Dynamic balance requirements : For high-speed rotating internal gear rings (such as in RV reducers), the dynamic balance grade can reach G2.5.
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