Reducer

Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.

K..R.. Series Gear Reducer

The K..R.. Series Combined Gear Reducer/Gearmotor mates a K Series right-angle gear unit with an R Series reduction stage for higher reduction ratios and lower output speed. Featuring a 90° drive layout and sizes ranging K..37R17 to K..187R107, it fits conveyors, bucket elevators, lifting, rotary and other industrial drive equipment.

Item	Value
Model	K..37R17 ~ K..187R107
Ratio Range	5.36 ~ 197.37
Motor Power	0.12 ~ 200 kW
Output Torque	200 ~ 50000 Nm
Mounting Type	Foot / Flange / Shaft Mounted
Output Shaft	Solid / Hollow Shaft

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Product Description

Key Technical Features & Advantages

K + R Combined Gear Structure: Combines K and R Series gear units for greater overall speed reduction.
Right-Angle Transmission: The K stage provides a 90° drive arrangement for right-angle equipment layouts.
Additional Reduction Stage: The R stage adds reduction to achieve lower output speeds where required.
Multiple Model Combinations: Covers K/R combinations from .37R17 to K..187R107, with different dimensional combinations available.
Flexible Motor Matching: Motor frame size and related dimensions are matched to the selected K/R combination.
Model-Specific Dimensions: Overall dimensions, L dimensions, motor dimensions, and mounting dimensions vary by model.
Technical Drawing Reference: The K..R.. mounting dimensional drawing supports model selection and installation planning.

Product Design Configurations

K..R.. Series: Combined K Series and R Series gear units
K..R.. Model Range: Multiple combinations including K..37R17, K..47R37, K..57R37, K..77R37, K..87R57, K..97R57, K..107R77, K..127R77, K..127R87, K..157R97, K..167R97, K..187R97, K..157R107, K..167R107, and K..187R107
Gear Arrangement: K Series right-angle gear unit combined with an additional R Series reduction stage
Drive Layout: Right-angle transmission
Size Selection: K and R sizes vary according to the required reduction and installation dimensions

Input & Output Configurations

Transmission Arrangement: Combined K and R gear stages
Input: Motor-driven input
Output: Reduced-speed output to the driven equipment
Drive Direction: Right-angle transmission arrangement
Model Combination: K size and R size selected according to the required drive arrangement

Mounting Styles & Options

Drive Layout: Right-angle installation arrangement
Motor Connection: Motor frame size and connection dimensions matched to the selected K/R combination
Installation Dimensions: Overall dimensions, L dimension, motor dimensions, and related mounting dimensions vary by model
Equipment Integration: Mounting position and available clearance should be checked against the selected model
Dimensional Reference: Refer to the .R.. Mounting Dimensional Descriptionbefore ordering and installation

Motor Options & Accessories

Motor frame size matched to the selected K/R combination
Motor connection dimensions
Motor-related installation dimensions
Mounting accessories according to the selected drive arrangement
Model-specific dimensional documentation

Primary Industrial Applications

Conveyor Systems
Material Handling Equipment
Bucket Elevators
Lifting and Transfer Equipment
Rotary Equipment
General Industrial Machinery

Our Core Strengths

Standardized Production Process Flow

Raw Material Forging & Normalizing
Premium alloy steel (20CrMnTi / 40Cr) forgings undergo strict normalizing and ultrasonic flaw detection to eliminate internal stress, optimize grain structure, and ensure superior core impact resistance.

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Precision CNC Machining & Gear Hobbing
Multi-axis CNC lathes complete high-precision turning of reference datums and end faces. High-speed CNC gear hobbing and shaping machines precisely form the initial tooth profile with strict geometric allowances.
Controlled Carburizing & Heat Treatment
Processed in multi-purpose atmosphere-controlled furnace lines. Surface carburizing and quenching achieve a wear-resistant surface hardness of HRC 58–62, while preserving tough, shock-absorbing cores.

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High-Precision CNC Gear Grinding
Advanced CNC profile gear grinding machines eliminate heat-treatment micro-distortions. Tooth flanks are precisely modified with crowning to achieve DIN Class 5–6 accuracy, ensuring whisper-quiet running.
Housing Machining & Clean Modular Assembly
Gearbox housings are machined on CNC horizontal machining centers for micron-level bore concentricity. Assembled in a clean workshop with top-tier bearings (SKF/NSK/C&U) and dual-lip oil seals to guarantee zero oil leakage.

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100% Comprehensive Testing & Export Packaging
Every unit undergoes 100% full inspection: gear measurement center (CMM), dynamic running test (vibration, noise, temperature rise) and sealing test before multi-layer anti-rust film and solid plywood case packaging.

Core Advantage

Ultra-Silent Transmission

High-precision gear grinding delivers tooth surface roughness as low as Ra 0.4, with tight meshing, low vibration and noise for smoother equipment operation.

Extended Service Life

Premium materials matched with precise heat treatment ensure wear-resistant tooth surfaces and impact-resistant core, cutting maintenance and replacement costs.

All-Condition Adaptation

Custom solutions for high-speed heavy load, corrosion resistance and food-grade scenarios, eliminating trial-and-error costs in product selection.

Cost-Effective & Reliable Delivery

Scaled production supports tiered pricing for bulk orders with consistent quality; full-process control guarantees stable lead time and complete after-sales support.

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Logistics and After-Sales Service

Global Logistics & Export Packaging

VCI Anti-Rust & Solid Plywood Packaging

Internal VCI vacuum anti-rust packaging combined with seaworthy, non-fumigation plywood crates to guarantee zero corrosion during long ocean transit.

Flexible Multi-Modal Shipping

Supporting Sea Freight, Air Cargo, and Railway Express (FOB, CIF, DDP/DDU) with real-time tracking for punctual delivery.

Complete Export Documentation

Full clearance support including Certificate of Origin (CO/Form E), CE certificates, and factory dynamic test reports.

After-Sales Service & Technical Warranty

12-Month Full Quality Warranty

100% free replacement or repair for any manufacturing-related defects under standard operating conditions within 12 months.

24/7 Rapid Engineering Support

Professional technical team provides 2-hour response for model selection, installation guidance, and troubleshooting.

Lifetime Spare Parts Availability

Sufficient inventory of standardized modular parts (gears, shafts, seals, bearings) ensuring rapid worldwide dispatch.

Frequently Asked Questions (FAQ)

Can your gearboxes directly replace international brands like SEW, Flender, or Bonfiglioli?

Yes. Our modular gearboxes (R, F, K, S series and planetary units) are designed to standard international mounting dimensions. They can achieve 1:1 direct interchangeability in mounting hole positions, shaft diameters, input flanges, and gear ratios without modifying your existing machinery.

What technical parameters do I need to provide to select the right gearbox?

To help our engineering team calculate the ideal model, please provide: input motor power (kW/HP), input/output speed (RPM) or gear ratio, required output torque (Nm), mounting position (horizontal/vertical), and the specific application or working environment.

What is the typical lead time for standard and customized gearboxes?

For standard modular models (R/F/K/S series and cycloidal gearboxes), lead time is typically 7–15 days. For customized units with special ratios, shafts, or special flanges, lead time is usually 20–30 days. Emergency spare parts are dispatched within 48 hours.

How do you guarantee zero oil leakage and transmission durability?

All gearboxes utilize precision-machined CNC housings for micro-level bore concentricity, premium dual-lip skeleton oil seals, and top-tier bearings (SKF/NSK/C&U). Every unit undergoes a 100% dynamic running test (vibration, noise, temperature rise) and sealing test before export packing.

What is your MOQ, warranty policy, and do you supply test reports?

Our MOQ is 1 unit (sample order supported). All products come with a 12-month comprehensive warranty. Each shipment can be provided with full documentation, including dynamic test records, material certificates, CMM gear inspection reports, and CE/ISO compliance certificates.