Double-helical Gear

Double-helical Gear Overview

Double-helical gears are a specialized type of gear that combines the advantages of both spur and single-helical gears while addressing the issue of axial thrust typically associated with helical gears. These gears are characterized by their unique tooth design, where two opposing helical gears are mounted side by side on the same gear blank, forming a V-shaped tooth pattern. This configuration cancels out the axial forces generated during operation, making them highly efficient and suitable for high-load, high-speed applications.

Key Features of Double-Helical Gears

V-Shaped Tooth Pattern:

The gear teeth are cut at an angle to the gear axis, forming two opposing helices.

The design eliminates axial thrust, which is a challenge in single-helical gears.

High Load Capacity:

Multiple teeth are engaged simultaneously, distributing the load evenly and increasing the load-carrying capacity.

Smooth and Quiet Operation:

The gradual engagement of helical teeth results in reduced vibration and noise levels.

Applications:

Our productions mainly used in fields of mining, metallurgy, cement, sugar plant, petrochemical industry, construction, and recycling facilities, aggregate.

Which is including non-standard machinery components, custom castings, forged parts, gears, shafts, ball mill spares, rotary kiln etc.

Specification

Standard and non-standard

Carbon steel, alloy steel

Forging, machining, heat treatment

Surface roughness: Ra0.8 after grinding

UT,MT, PT

Diameter: ≤13m

Key Parameters in Double-Helical Gear Design

Helix Angle (β):

The angle of the helical teeth, typically ranging between 15° and 30°.

Affects the smoothness of operation and the load capacity.

Module (m):

Defines the size of the gear teeth.

Formula:

where D is the pitch diameter, and N is the number of teeth.

Face Width (b):

The width of the gear teeth along the axial direction.

Larger face widths provide higher load-carrying capacity.

Pressure Angle (α):

The angle at which the teeth make contact, typically 20° for standard designs.

Gap Between Helices:

A small clearance is often provided between the two helices to avoid overlap and ease of manufacturing.

Comparison Between Double-Helical and Single-Helical Gears