Precision spur and helical oil pump gears, gerotor pump rotors, and hydraulic pump drive shafts engineered for maximum volumetric efficiency, smooth flow, and long pump life.
Review machine application, displacement, working pressure, port threads, and rotation direction before requesting a quotation.
In hydraulic gear pumps and engine lubrication systems, the gear pair is the heart of fluid displacement. Internal clearances determine volumetric efficiency, operating pressure capability, and noise levels. ZhongYi is an established Tier-1 and Tier-2 supplier of precision oil pump gears, providing matched gear pairs and drive shafts to leading engine and pump manufacturers (including Weichai Power and Gaomi Runda partner supply lines). We produce external spur and helical pump gears, crescent internal gear sets, and gerotor-style pump rotors. Our precision end-face grinding achieves parallelism within 0.003 mm to eliminate internal oil slippage under pressures up to 25 MPa.
Overseas procurement teams require verifiable technical data, not unsupported claims. Every production batch at ZhongYi is inspected against approved CAD blueprints and international standards (DIN, AGMA, ISO).
Component-Specific Quality Focus:
Pump efficiency drops dramatically with even minor end-face leakage or tooth flank pitting. ZhongYi controls tooth thickness to within ±0.005 mm and end-face flatness to 0.003 mm, ensuring consistent flow rates and high volumetric efficiency across the entire operating temperature range.
Coordinate Metrology
Zeiss / Hexagon 3D CMM
Validates 3D spatial GD&T, bore concentricity, center distance, and geometric tolerances down to ±0.002 mm.
Tooth Geometry Analysis
Klingelnberg CNC Gear Analyzer
Inspects involute tooth profile error (fα), lead crowning (fβ), pitch cumulative error (Fp), and radial runout (Fr).
Hardness & Case Depth
Digital Micro-Vickers & Rockwell Testers
Verifies surface hardness (58–62 HRC), core toughness, and effective carburized / nitrided case depth gradient.
Chemical Metallurgy
Direct-Reading Optical Spectrometer
100% chemical composition verification of alloy steel forgings (20CrMnTi, 42CrMo, 18CrNiMo7-6, Stainless, POM).
Inspection Deliverables with Every Shipment
Complete Batch Traceability & Certified Test Reports
EN 10204 Type 3.1 Mill Test Certificate (Chemical & Mechanical Properties)
Zeiss 3D CMM Full Dimensional Inspection Sheet
Klingelnberg Tooth Profile & Lead Crowning Graph Report
Effective Carburized Case Depth & Hardness Curve Data
We maintain strict incoming material spectroscopy, in-process CNC tooth coordinate monitoring, and 100% final pre-shipment dimensional inspection. All custom gear batches are backed by our full manufacturing warranty.
High-torque, impact-resistant gears, girth rings, and planetary drive sets engineered for excavators, cranes, drilling rigs, and heavy mining crushers.
Common questions before ordering custom oil pump gears & hydraulic pump gear sets products.
Critical specifications are confirmed against final drawings before production.
Why are helical gears increasingly used in modern oil pumps?▼
Helical gears provide continuous progressive contact, which reduces fluid trapping, cavitation noise, and pressure ripple compared to standard spur gears, making them ideal for quiet automotive engines and precision hydraulic systems.
How does ZhongYi prevent fluid trapping in external gear pumps?▼
We incorporate optimized tooth tip chamfers, modified dedendum clearance, and matching relief groove designs that allow trapped oil between teeth to escape smoothly into the pressure outlet without causing pressure spikes.
Can you produce oil pump gears from sintered powder metallurgy materials?▼
Yes, for high-volume automotive applications we provide high-density sintered powder metallurgy pump gears with excellent dimensional repeatability and wear resistance.
24-Hour Engineering Quote & DFM Review
Upload Your Drawings for Custom Oil Pump Gears & Hydraulic Pump Gear Sets Manufacturing
Send your 2D blueprints or 3D CAD models. Our senior gear engineering team will review tooth geometry, module/pitch, materials, heat treatment feasibility, and provide transparent factory pricing within 24 hours.
Supported CAD Blueprint & Drawing Formats:
STEP (.step / .stp) AutoCAD (.dwg / .dxf) IGES (.igs) SolidWorks / 3D CAD PDF Technical Blueprints Worn Physical Samples
Mutual NDA Protection
We sign strict Non-Disclosure Agreements to safeguard proprietary designs.
< 24h DFM Feedback
Rapid manufacturability review, tolerance checks, and unit quotation.
Direct Factory Engineering
Direct technical communication with senior master gear artisans.
