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China wholesaler Internal Spline Bull Spur Gear worm gear motor

Product Description


Machining Capability

Our Gear, Pinion Shaft, Ring Gear Capabilities: 

Capabilities of Gears/ Splines    
Item Internal Gears and Internal Splines External Gears and External Splines
Milled Shaped Ground Hobbed Milled Ground
Max O.D. 2500 mm
Min I.D.(mm) 30 320 20
Max Face Width(mm) 500 1480
Max DP 1 0.5 1 0.5
Max Module(mm) 26 45 26 45
DIN Class Level DIN Class 8 DIN Class 4 DIN Class 8 DIN Class 4
Tooth Finish Ra 3.2 Ra 0.6 Ra 3.2 Ra 0.6
Max Helix Angle ±22.5° ±45° 


Our Main Product Range


1. Spur Gear
2. Planetary Gear
3. Metal Gears
5. Ring Gear
6. Gear Shaft
7. Helical Gear
8. Pinion Shaft
9. Spline Shaft



Company Profile

1. 21 years experience in high quality gear, gear shaft’s production, sales and R&D.

2. Our Gear, Gear Shaft are certificated by ISO9001: 2008 and ISO14001: 2004.

3. CHINAMFG has more than 50 patents in high quality Gear, Gear Shaft manufacturing.

4. CHINAMFG products are exported to America, Europe.

5. Experience in cooperate with many Fortune 500 Companies

Our Advantages

1) In-house capability: OEM service as per customers’ requests, with in-house tooling design & fabricating

2) Professional engineering capability: On product design, optimization and performance analysis

3) Manufacturing capability range: DIN 3960 class 8 to 4, ISO 1328 class 8 to 4, AGMA 2000 class 10-15, JIS 1702-1703 class 0 to 2, etc.

4) Packing: Tailor-made packaging method according to customer’s requirement

5) Just-in-time delivery capability


1. Q: Can you make as per custom drawing?

A: Yes, we can do that.

2. Q: If I don’t have drawing, what can you do for me?
A: If you don’t have drawing, but have the sample part, you may send us. We will check if we can make it or not.

3. Q: How do you make sure the quality of your products?
A: We will do a series of inspections, such as:
A. Raw material inspection (includes chemical and physical mechanical characters inspection),
B. Machining process dimensional inspection (includes: 1st pc inspection, self inspection, final inspection),
C. Heat treatment result inspection,
D. Gear tooth inspection (to know the achieved gear quality level),
E. Magnetic particle inspection (to know if there’s any cracks in the gear).
We will provide you the reports 1 set for each batch/ shipment.   

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Application: Machinery
Hardness: Hardened Tooth Surface
Gear Position: Internal and External


Customized Request

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Shipping Cost:

Estimated freight per unit.

about shipping cost and estimated delivery time.
Payment Method:


Initial Payment

Full Payment
Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

How do you retrofit an existing mechanical system with internal gears?

Retrofitting an existing mechanical system with internal gears involves modifying or upgrading the system to incorporate internal gears for improved performance or functionality. Here’s a detailed explanation of the process involved in retrofitting an existing mechanical system with internal gears:

Retrofitting a mechanical system with internal gears requires careful planning, engineering analysis, and implementation. The specific steps may vary depending on the nature of the system and the intended objectives of the retrofit. Here is a general approach to retrofitting an existing mechanical system with internal gears:

  1. Evaluation of the Existing System: Begin by thoroughly evaluating the existing mechanical system. Understand its design, components, operating parameters, and limitations. Identify the specific areas where the introduction of internal gears can address the desired improvements, such as increased efficiency, torque capacity, or functionality.
  2. Feasibility Study and Design: Conduct a feasibility study to determine the viability of retrofitting internal gears into the system. Evaluate factors such as available space, compatibility of gear sizes and specifications, alignment requirements, and potential modifications needed for gear integration. Based on the study, develop a detailed design plan for incorporating internal gears into the existing system.
  3. Gear Selection and Sizing: Select suitable internal gears that meet the requirements of the retrofit. Consider factors such as gear ratio, torque capacity, tooth profile, material compatibility, and lubrication needs. Ensure that the selected gears are compatible with the existing system and can handle the expected loads and operating conditions.
  4. Modification of Components: Depending on the design and integration requirements, certain components of the existing system may need modification or adaptation to accommodate the internal gears. This could involve machining new mounting points, adjusting shaft positions, or modifying housing structures to ensure proper alignment and engagement of the gears.
  5. Fabrication or Procurement of Gears: Once the gear specifications are finalized, proceed with the fabrication or procurement of the internal gears. Ensure that the gears are manufactured to the required tolerances and quality standards. If custom gears are needed, work with a reputable gear manufacturer or machining facility to produce the gears.
  6. Installation and Integration: Install the internal gears into the retrofit system according to the design plan. Ensure proper alignment, engagement, and meshing of the gears. Pay attention to factors such as backlash, lubrication requirements, and any additional components or systems needed to support the gear integration.
  7. Testing and Validation: Conduct thorough testing and validation of the retrofit system with the newly integrated internal gears. Perform functional tests to verify the improved performance, efficiency, or functionality achieved through the retrofit. Monitor factors such as gear noise, vibration, temperature, and overall system operation to ensure satisfactory results.
  8. Documentation and Maintenance: Document the retrofit process, including design modifications, gear specifications, installation procedures, and testing results. This documentation will be useful for future reference, maintenance, and troubleshooting. Establish a maintenance plan to regularly inspect, lubricate, and service the internal gears to ensure their long-term performance and reliability.

It’s important to note that retrofitting an existing mechanical system with internal gears can be a complex task and may require expertise in gear design, mechanical engineering, and system integration. Engaging experienced professionals or consulting with gear manufacturers and engineering consultants can help ensure a successful retrofit.

Additionally, the feasibility and success of retrofitting depend on factors such as the nature of the existing system, available space, compatibility of components, and the specific objectives of the retrofit. A comprehensive analysis and careful planning are essential to determine the most appropriate approach and achieve the desired outcomes.

China wholesaler Internal Spline Bull Spur Gear worm gear motorChina wholesaler Internal Spline Bull Spur Gear worm gear motor
editor by Dream 2024-05-14


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