ZQ 650 Gearbox (Size 650) – Output Shaft 100mm | Load 15-20 Tons

The ZQ 650 Gearbox (or JZQ 650) is a heavy-duty cylindrical gear gearbox line. With a 650mm center distance and a sturdy HT200 cast iron housing structure, the ZQ 650 is designed to operate under harsh working conditions (Service Factor > 2.0) such as mineral crushing stations, tunnel brick pressing machines, and heavy-duty lifting mechanisms.

General design of the ZQ gearbox

An overview of the design of the ZQ 650 includes the following prominent features:

• Sturdy housing structure: The housing of the gearbox is cast in one piece from extremely thick gray cast iron materials such as HT200 or HT250. The housing undergoes stress-relief annealing, which effectively resists thermal deformation, withstands heavy impacts, and provides absolute protection for the internal gear system.
• Helical gear system: Instead of conventional straight teeth, the ZQ 650 applies helical gear milling technology combined with carbon-itriding heat treatment. This design helps increase the contact area between tooth faces, distributes force evenly, and thereby minimizes noise and vibration when operating at high speeds.
• High-load transmission shaft: The input and output shafts of the gearbox are made of C45 or 40Cr steel with improved quenching, ensuring rigidity and preventing bending or shaft breakage under sudden loads.
• Large center distance: With a center distance of up to 650mm, the design of the ZQ 650 creates a spacious oil chamber, supporting extremely effective natural heat dissipation, preventing the oil from boiling or degrading when the machine runs continuously for multiple shifts.

Structure of the ZQ 650 heavy-duty gearbox

To ensure fatigue strength under continuous impact loads, the components in the ZQ 650 are manufactured according to the JB/T 8853-2001 standard:

• Gears: Uses alloy steel 20CrMnTi or 40Cr.
  • Machining: Helical gear milling to increase contact area and reduce noise.
  • Heat treatment: Carburizing & Quenching.
  • Tooth face hardness: Reaches 58 – 62 HRC.
  • Tooth core hardness: Reaches 30 – 35 HRC (making the teeth tough and resistant to brittle fracture).
• Shafts: C45 or 40Cr steel with Quenching and Tempering, hardness HB 217-255.
• Housing: Gray cast iron HT200 or HT250 cast in one piece. Stress-relief annealed to resist thermal deformation.
• Bearings: Uses 100% tapered roller bearings codes 303xx, 72xx of large sizes, allowing it to withstand both radial and axial loads.

Technical specifications of the ZQ 650 Gearbox (Size 650)

Below are the important dimensional and assembly tolerance specifications of the ZQ 650. This line is suitable for installation with 30kW – 45kW – 55kW motors (4 Pole / 6 Pole), featuring a variety of transmission ratios: 48.57, 40.17, 31.5, 23.34, 20.49, 15.75, 12.64, 10.35.

Practical applications of the ZQ 650 Gearbox

Thanks to possessing a Service Factor > 2.0 along with the ability to generate a maximum output torque of up to 25,000 N.m, the ZQ 650 Gearbox (Size 650) is an indispensable drive component in heavy industries.

• Mining & Metallurgy Industry: Applied in coal washing machines, steel rolling machines, and metal wire drawing machines.
• Building Materials Manufacturing Industry: Used for mixing systems and high-intensity concrete batching plants.
• Heavy-Duty Lifting Mechanisms: Installed in overhead cranes, gantry cranes, and container lifting cranes at ports and shipyards.
• Sugar Cane & Paper Industry: Transmission for sugar cane mills, wood chipper machines, and paper pulp defibrators requiring strong and continuous pulling force.

Guide on how to add oil to the ZQ gearbox

For the ZQ 650 Gearbox (Size 650) to operate smoothly and extend the lifespan of the gear and bearing systems, adding oil and periodic maintenance are extremely important. The technical team of Thanh Thái Motor guides you through the standard oiling procedure as follows:

• Preparation: Place the ZQ gearbox on a balanced flat surface to measure the oil amount most accurately.
• Open cap: Remove the breather bolt (usually located at the highest position on the gearbox cover) to make the oil filling hole.
• Adding oil: Slowly pour oil into the gearbox. At the same time, continuously observe the oil level sight glass located on the side of the gearbox.
• Standard level: Stop adding when the oil level reaches the middle (1/2) of the sight glass. Do not overfill (causing vapor lock, seal blowout, oil leakage) and do not add too little (insufficient lubrication leading to burned or worn gears).

The ZQ 650 Gearbox is born to meet the most stringent requirements in heavy-duty drive systems. With a sturdy mechanical structure from a solid cast iron housing, a carbon-itriding hardened helical gear system achieving high hardness, and high torque resistance. Refer to the gearbox videos or visit the comprehensive video page to see more about product lines at Thanh Thái Motor.

Warranty, Shipping, and Commitment Policy at Thanh Thai Motor

When purchasing gearboxes at Thanh Thai Motor, you will receive benefits such as:

Warranty up to 24 months

Gearbox products at Thanh Thai Motor are covered by a genuine warranty for up to 24 months. Customers can be completely confident in using them with a clear, transparent, and prompt after-sales policy.

Nationwide Delivery

We support fast delivery to all provinces and cities nationwide. Wherever you are, products are guaranteed to arrive on time and safely.

Products meeting European quality standards with German technology

Gearboxes at Thanh Thai Motor are manufactured using advanced German technology, meeting European quality standards. Ensuring high durability and stable operation for extended periods.

Competitive prices, good discounts for dealers and bulk customers

Reasonable prices, many attractive offers for wholesale buyers and distribution agents. The more you buy, the higher the discount – optimizing profits for customers.

Full certification documents: CO, CQ,...

Each product comes with full Certificate of Origin (CO) and Certificate of Quality (CQ). This provides assurance for customers when using them in projects or constructions requiring technical documentation.

Contact for Purchase

Do you need advice on choosing the right gearbox for your needs? Contact Thanh Thai Motor immediately using the methods below:

• WhatsApp: +84966596219
• Email: codienthanhthai@gmail.com