Eccentric Weight Assembly for Vibratory Rollers | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Eccentric Weight Assembly

Definition

The eccentric weight assembly is a critical component of a vibratory roller that creates the vibratory force necessary for soil and asphalt compaction. It consists of eccentric weights mounted on a rotating shaft that, when spun at high speeds, generates centrifugal force to produce vibrations transmitted through the roller drum. The assembly is driven by a hydraulic motor or mechanical drive, and the offset mass distribution of the weights creates an unbalanced force, causing the drum to vibrate at controlled frequencies and amplitudes. This enhances compaction efficiency by reducing air voids in the material. The assembly is typically made from high-strength alloy steel, with a material grade of 45# per GB/T 699, and is heat-treated to a hardness of HRC 28–32 per GB/T 230.1. It is surface-treated with zinc plating per GB/T 9799 for corrosion protection. The rated speed ranges from 3000 to 6000 rpm, eccentric moment from 0.5 to 5.0 kg·m, and centrifugal force from 10 to 100 kN. The maximum operating temperature is -20 to 80 °C. Balance accuracy is G2.5 per ISO 1940-1, and the bearing type is 6205-2RS per GB/T 276. The assembly weighs between 5 and 20 kg, with a mounting hole diameter of 20 to 40 mm. The IP rating is IP54 to IP65 per IEC 60529. These parameters are reference ranges; actual values must be confirmed with the legal manufacturer or supplier for specific models and applications. The assembly is designed for durability and maintenance-free operation, but regular inspection is recommended to detect wear or imbalance. If vibration levels change or unusual noise occurs, the assembly should be checked for damage or loosening. Proper installation and alignment are critical to avoid premature failure. Always verify that the assembly matches the compactor's design specifications and that all standards are met for the intended use.

Working Principle

The assembly rotates via a hydraulic motor or mechanical drive, creating an unbalanced centrifugal force due to the offset mass distribution of the eccentric weights. This force causes the roller drum to vibrate at specific frequencies and amplitudes, enhancing compaction efficiency by reducing air voids in the material being compacted. The magnitude of the force depends on the eccentric moment and rotational speed, which are set to match the compactor's design. The vibration frequency is directly proportional to the rotational speed, while the amplitude is determined by the eccentric moment. The assembly's balance accuracy ensures smooth operation and minimizes unwanted vibration. The sealed bearing allows maintenance-free operation, but the operating temperature must stay within the specified range to avoid degrading bearing lubrication. If the assembly operates outside these parameters, it may lead to excessive wear or failure. Therefore, it is essential to monitor speed and temperature and to verify that the assembly is correctly installed and balanced.

Common Materials

High-strength alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Speed	3000–6000 rpm	Determines centrifugal force; higher speed increases vibration frequency.
Eccentric Moment	0.5–5.0 kg·m	Product of mass and eccentricity; defines vibration amplitude.
Centrifugal Force	10–100 kN	Generated force; must match compactor design.
Max Operating Temperature	-20–80 °C	Exceeding may degrade bearing lubrication.
Material Grade	45#	High-strength carbon steel for durability.GB/T 699
Hardness	HRC 28–32	Balances wear resistance and machinability.GB/T 230.1
Surface Treatment	Zinc-plated	Corrosion protection for outdoor use.GB/T 9799
Balance Accuracy	G2.5	Ensures smooth operation and low vibration.ISO 1940-1
Bearing Type	6205-2RS	Sealed ball bearing for maintenance-free operation.GB/T 276
Weight	5–20 kg	Affects handling and installation.
Mounting Hole Diameter	20–40 mm	Must match shaft size.
IP Rating	IP54–IP65	Protects against dust and water ingress.IEC 60529

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

Components / BOM

Eccentric Weight Part
Provides offset mass to create centrifugal force

Material: High-strength alloy steel
Shaft Part
Supports and rotates the eccentric weights

Material: Hardened steel
Bearing Housing Part
Contains bearings for smooth shaft rotation

Material: Cast iron or steel
Drive Coupling
Connects to hydraulic motor or drive system

Material: Steel alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Weight Assembly.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Vibratory Roller

View system integration details

Vibrators

View system integration details

Manufacturers of Eccentric Weight Assembly

Manufacturer profiles associated with Eccentric Weight Assembly.

Sourcing Eccentric Weight Assembly from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

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 · Page last updated 6 September 2026

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.

Frequently Asked Questions

What is the function of the eccentric weight assembly in a vibratory roller?

It generates the vibratory force needed for soil and asphalt compaction by rotating eccentric weights to produce centrifugal force, which is transmitted to the roller drum.

What are the typical operating parameters for this assembly?

The rated speed is 3000–6000 rpm, eccentric moment 0.5–5.0 kg·m, centrifugal force 10–100 kN, and maximum operating temperature -20 to 80 °C. These are reference ranges; confirm for your specific model.

What maintenance is required for the eccentric weight assembly?

The sealed bearing is maintenance-free, but periodic inspection is recommended to check for wear, imbalance, or damage. Ensure the operating temperature stays within limits to protect bearing lubrication.

How do I verify that the assembly meets the required standards?

Check the material grade (45# per GB/T 699), hardness (HRC 28–32 per GB/T 230.1), surface treatment (zinc-plated per GB/T 9799), balance accuracy (G2.5 per ISO 1940-1), bearing type (6205-2RS per GB/T 276), and IP rating (IP54–IP65 per IEC 60529). Always confirm with the legal manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Buyer enquiry

Request manufacturing insight for Eccentric Weight Assembly

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Atmospheric (non-pressurized)
other spec:	Max rotational speed: 3000 RPM, Vibration frequency: 10-100 Hz
temperature:	-20°C to 120°C

Eccentric Weight Assembly

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards