Pinion Gears: Face Width 25-40 mm, Pressure Angle 20°

Component Specifications

Definition

Pinion gears are precision-engineered mechanical components that serve as the primary driving element in gear systems, particularly in automotive differentials. These small-diameter gears engage with larger ring gears to convert rotational input from the driveshaft into torque distribution to the wheels. In front differential applications, pinion gears are critical for managing power delivery during turning maneuvers while maintaining vehicle stability and traction control.

Working Principle

Pinion gears operate on the fundamental principle of gear meshing, where teeth engagement transfers rotational motion and torque between shafts. In a front differential, the pinion gear receives input from the driveshaft and transmits it to the ring gear at a 90-degree angle, enabling power redirection to the axle shafts. The gear ratio between pinion and ring gears determines torque multiplication and speed reduction, while hypoid or spiral bevel tooth designs minimize noise and maximize power transmission efficiency.

Materials

Case-hardened alloy steels (SAE 8620, SAE 9310) with surface hardness of 58-62 HRC and core toughness of 28-32 HRC. Advanced applications may use powder metallurgy steels or ceramic composites for extreme conditions.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Module	2.0-4.0 mm
Face Width	25-40 mm
Tooth Profile	Spiral Bevel/Hypoid
Heat Treatment	Carburizing and Tempering
Pressure Angle	20°
Surface Finish	Ra 0.4-0.8 μm
Number Of Teeth	9-13

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1328-1, DIN 3961, AGMA 2005, JIS B 1702

Parent Products

This component is used in the following industrial products

Front Differential

A mechanical device in the front axle of an all-wheel drive vehicle that allows the front wheels to rotate at different speeds while distributing torque.

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Engineering Analysis

Risks & Mitigation

Tooth pitting from excessive load
Scoring due to lubrication failure
Backlash increase from wear
Noise generation from improper meshing
Fatigue fracture from cyclic stress

FMEA Triads

Trigger: Inadequate lubrication or contaminated gear oil
Failure: Accelerated tooth wear and scoring
Mitigation: Implement scheduled oil changes with specified GL-5 grade, install magnetic drain plugs, and use sealed differential housings

Trigger: Improper gear mesh pattern during assembly
Failure: Localized tooth contact leading to premature pitting
Mitigation: Use precision shimming for optimal contact pattern, verify backlash within 0.15-0.25 mm, and apply marking compound for pattern verification

Trigger: Excessive torque or shock loading
Failure: Tooth bending fatigue or fracture
Mitigation: Design with adequate safety factor (minimum 2.0), implement torque limiters in drivetrain, and use impact-resistant materials like SAE 9310 steel

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Tooth profile tolerance: AGMA Class 9-11, Runout: ≤0.05 mm, Backlash: 0.15-0.25 mm

Test Method

Coordinate measuring machine (CMM) verification, Gleason testing for tooth contact pattern, hardness testing per ISO 6508, fatigue testing per ISO 6336

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Pinion Gears

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Jinhua Machinery

Jiangsu, CN

Also makes: Construction Equipment, Electric Motor, Helical/Bevel Gears

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Ring & Pinion Gears”
View source page ↗ jinhuamach.com · checked 2026-09-18

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a pinion gear in a front differential?

The pinion gear transfers rotational power from the driveshaft to the ring gear at a 90-degree angle, enabling torque distribution to the front wheels while allowing differential action during turns.

How do pinion gears differ from other gear types in automotive applications?

Pinion gears are specifically designed as the smaller driving gear in a pair, featuring hypoid or spiral bevel tooth profiles that allow offset shaft positioning and smooth power transfer at angles, unlike spur gears which operate on parallel shafts.

What maintenance practices extend pinion gear lifespan?

Regular lubrication with GL-5 gear oil, periodic backlash adjustment (0.15-0.25 mm), proper preload setting (1.2-1.8 Nm rotational torque), and contamination prevention through sealed housing maintenance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Pinion Gears