Pololu 4681 / 4682 Metal Gearmotor 37Dx52L mm 24V - Helical Pinion

The Pololu 4681 / 4682 Metal Gearmotor is a compact 24V DC motor with integrated helical gearbox designed for high-torque, low-speed applications requiring precision motion control. This motor is extensively used by roboticists, automation engineers, and embedded systems developers who need reliable torque delivery with minimal backlash in mobile robots, conveyor systems, and mechanical actuators. It solves the critical challenge of converting high-speed motor rotation into controlled, powerful low-speed output while maintaining mechanical efficiency and durability in demanding industrial and hobbyist projects.

Product Overview

The Pololu 4681 / 4682 features a brushed DC motor coupled with a helical gearbox that provides smooth, quiet operation compared to spur gears. The helical pinion design reduces noise and vibration while distributing load across multiple gear teeth simultaneously, resulting in extended motor lifespan and improved power transmission efficiency. The 37mm diameter cylindrical housing with 52mm length makes it ideal for space-constrained applications, while the 24V nominal voltage ensures compatibility with standard industrial power supplies and battery systems commonly used in robotics and automation platforms.

The motor delivers exceptional torque multiplication through its gear reduction system, making it suitable for applications requiring sustained pulling or pushing forces. The metal construction of the gearbox housing provides superior heat dissipation compared to plastic alternatives, allowing continuous operation without thermal throttling. The dual output shaft configuration available in models 4681 and 4682 offers flexibility in mechanical coupling options, whether you need a single extended shaft or dual-output capability for synchronized motion control in dual-motor systems.

Key Specifications

Specification	Details
Product Type	24V DC Metal Gearmotor with Helical Pinion
Brand	Pololu Robotics and Electronics
Origin	Original / Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Nominal Voltage	24 VDC
Motor Diameter	37 mm
Motor Length	52 mm
Gearbox Type	Helical Pinion Reduction Gearbox
Output Shaft Configuration	Model 4681 (single) / Model 4682 (dual)
Operating Temperature Range	-20 to +70 degrees Celsius

Key Features

• Helical Pinion Gearbox Design: Provides smooth, quiet operation with minimal backlash and superior load distribution across multiple gear teeth for extended durability
• Metal Housing Construction: Aluminum or steel gearbox enclosure offers excellent heat dissipation, corrosion resistance, and mechanical robustness for harsh industrial environments
• High Torque Output: Significant gear reduction ratio delivers powerful torque multiplication ideal for heavy-load applications including mobile robot propulsion and conveyor drive systems
• Compact Form Factor: 37mm diameter and 52mm length enables integration into space-constrained mechanical designs without compromising performance or reliability
• Dual Model Availability: Choose between 4681 with single output shaft or 4682 with dual outputs for synchronized multi-motor applications and flexible coupling options
• Low Noise Operation: Helical gear engagement produces significantly quieter operation compared to traditional spur gears, suitable for noise-sensitive applications

Applications and Use Cases

• Mobile Robotics: Drive wheels and locomotion systems in wheeled robots requiring consistent torque and precise speed control for autonomous navigation and obstacle avoidance
• Industrial Conveyor Systems: Material handling and assembly line conveyors where reliable, continuous-duty torque delivery is essential for production efficiency
• Robotic Manipulators: Joint actuators in robotic arms and grippers where helical gearbox smoothness prevents jerky motion and enables precise positioning
• Automation Equipment: Automated door openers, linear actuators, and mechanical indexing systems requiring compact, high-torque motors with minimal backlash
• Agricultural Machinery: Seed dispensers, irrigation pump drives, and harvest equipment where durability and weather resistance are critical operational requirements
• Educational Robotics: Competition robots and STEM projects where students need reliable, well-documented motors with proven performance characteristics

How to Use

Before installation, verify that your power supply provides stable 24V DC output with adequate current capacity for your specific load requirements. Mount the motor securely using the mounting holes or flanges provided, ensuring the output shaft has sufficient clearance for rotation without obstruction. Connect the motor terminals to your power source through an appropriate motor controller or PWM driver that supports 24V DC operation. For dual-motor configurations using the 4682 model, ensure both motors are electrically synchronized through your control circuit to prevent mechanical binding or uneven load distribution.

During initial operation, run the motor at reduced voltage to verify smooth rotation and listen for any grinding or unusual noises that might indicate improper assembly or bearing issues. Allow the gearbox to warm up gradually as internal lubricant reaches optimal operating temperature. For continuous-duty applications, monitor motor temperature periodically and ensure adequate ventilation around the metal housing. If the motor will operate in dusty or wet environments, consider protective covers that maintain airflow while preventing contamination of the gearbox seals and bearing surfaces.

Frequently Asked Questions

What is the gear reduction ratio of the Pololu 4681 / 4682 Metal Gearmotor?

The Pololu 4681 / 4682 features multiple gear reduction ratio options typically ranging from 30:1 to 150:1 depending on the specific variant. The exact reduction ratio determines the output torque and speed characteristics. Higher ratios provide greater torque multiplication but lower output speed. Consult the detailed product datasheet or contact our technical team to confirm the specific reduction ratio for your application requirements.

Can I use the Pololu 4681 / 4682 with voltage levels below 24V?

Yes, the motor can operate at reduced voltage levels such as 12V or 18V, though this will decrease output torque and speed proportionally. However, operating significantly below the rated 24V nominal voltage may result in insufficient torque for your application and reduced motor efficiency. For optimal performance and longevity, maintain voltage within 20-28V range. Always verify your specific load requirements before selecting a reduced voltage operating point.

What is the difference between the Pololu 4681 and 4682 models?

The primary difference is the output shaft configuration. The Pololu 4681 features a single output shaft extending from one end of the gearbox, suitable for single-motor applications. The Pololu 4682 provides dual output shafts extending from both ends, enabling synchronized dual-motor setups without requiring external mechanical linkages. Choose the 4682 if you need matched motor pairs for balanced propulsion or dual-axis control in your project.

What is the maximum continuous current draw of this motor?

The maximum continuous current depends on load torque and motor efficiency characteristics. Typically, the Pololu 4681 / 4682 draws between 2-5 amperes under normal operating loads at 24V nominal voltage. For applications requiring sustained high torque, ensure your power supply and motor controller can deliver adequate current capacity. Consult the detailed specifications or contact our technical support team with your specific load parameters for precise current calculations.

Is the gearbox sealed against dust and moisture?

The metal gearbox housing provides good protection against dust ingress compared to plastic alternatives. However, the design includes bearing seals and labyrinth passages rather than complete hermetic sealing. For operation in wet or extremely dusty environments, we recommend adding protective covers or boots around the output shaft area while maintaining adequate ventilation to prevent heat buildup and condensation inside the gearbox.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
• Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy Pololu 4681 / 4682 Metal Gearmotor 37Dx52L mm 24V - Helical Pinion Online in India

Purchase the Pololu 4681 / 4682 Metal Gearmotor 37Dx52L mm 24V - Helical Pinion online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 4681 / 4682 Metal Gearmotor 37Dx52L mm 24V - Helical Pinion with fast shipping and expert support.

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