1. Industrial News: China Factory Expands OEM Sliding Bearing Solutions

On September 07, 2026, Sealocean Group announced an expanded engineering supply program for DQ, DQY, DDQ and ZQ spherical sliding bearings used on large-frame electric motors and generators.

Compared with conventional rolling bearings, spherical sliding bearing systems are particularly suitable for large rotating machines where shaft diameter, rotor weight, continuous-duty operation, lubrication conditions and axial-load management require a dedicated bearing structure.

The engineering supply program focuses on replacement and OEM-compatible solutions for equipment using motor bearing arrangements associated with YKK, YKS, YRKK, YR, YB and related large industrial motor families.

2. DQ Spherical Sliding Bearing

The DQ series is a spherical sliding bearing solution for large motor end-shield applications. Its double-spherical self-aligning construction allows controlled angular compensation between the bearing components and the motor structure.

DQ bearings can be supplied as Type A solid motor end-shield structures or Type B split end-shield structures. The J suffix indicates an insulated bearing structure for applications requiring electrical isolation between the shaft/bearing system and the motor frame.

3. DQY Improved Spherical Sliding Bearing

The DQY series is an improved spherical sliding bearing configuration developed for demanding large AC and DC motor applications. The structure emphasizes compact installation, vibration control, lubrication stability and continuous-duty operation.

Depending on the equipment design, DQY bearings can work with oil-ring lubrication or forced-pressure lubrication systems. They are particularly suitable for large-frame motor applications where bearing temperature, vibration and alignment are critical engineering parameters.

Typical models include DQY14-125A/AJ and DQY22-225BJ.

4. DDQ Reinforced Sliding Bearing

The DDQ series is a reinforced DQ-type solution designed for applications requiring enhanced heat dissipation and improved sealing performance. It can be considered for large-frame motors operating under elevated ambient temperature, dusty industrial conditions or demanding continuous-duty requirements.

The reinforced structure helps engineering teams address bearing thermal management, oil leakage control and negative-pressure oil-suction risks.

A representative configuration is DDQ18-200B.

5. ZQ Pedestal Spherical Sliding Bearing

The ZQ series uses a pedestal-mounted spherical sliding bearing arrangement. It is suitable where the bearing housing is installed independently from the motor end shield or where a dedicated pedestal structure is required.

The ZQ family can be configured for oil-ring lubrication, combined lubrication and different thrust-pad arrangements.

• H: oil-ring lubrication
• F: combined lubrication
• K: oil-wedge thrust structure
• T: elastic thrust-pad structure
• J: insulated structure

Typical configurations include ZQ18#, ZQ20FJ1, ZQ18FJ2, ZQK28-H2 and ZQKT20-200.

6. Babbitt Material and Bearing Construction

The bearing shell can be manufactured from forged 20# steel substrate with tin-based Babbitt alloy ZSnSb11Cu6. For special engineering projects, lead-free TEGO-STAR738 material can also be evaluated according to the operating conditions and technical specification.

7. Technical Model Reference Table

8. Operating Parameters and Lubrication

9. Thrust Structure Selection

The Q/B/K/T designation should be evaluated together with the actual axial-load condition of the motor or generator.

10. Engineering Application Cases with Specific Motor Models

11. Motor Series Covered by the Engineering Program

The bearing engineering database can be evaluated for large motor families including YKK, YKS, YRKK, YRKS, YR, YB, YBX, YBX3, YBX4, YBX5, YE3, YE4, Z, Z4 and ZZJ series.

Typical industries include thermal power generation, cement, steel, metallurgy, mining, chemical processing, large pumping stations, industrial fans, blowers and EPC rotating-equipment projects.

12. Bearing Replacement for International Brands

For replacement projects, Sealocean Group can evaluate dimensional and functional alternatives for bearing systems associated with international brands such as MIBA, RENK, Kingsbury, Michell, Waukesha, GGB, Taiho Kogyo, Daido Metal and DEVA.

Replacement should be based on original bearing drawings, shaft dimensions, housing dimensions, lubrication system, axial-load direction, operating speed, oil temperature, insulation requirements and installation tolerances.

13. Installation and Maintenance Recommendations

• Confirm shaft diameter and bearing housing dimensions before procurement.
• Verify motor rotor alignment and bearing centerline.
• Remove unsuitable anti-rust coating from functional surfaces before installation.
• Never hammer directly on spherical bearing surfaces.
• Maintain oil level at approximately 1/2–2/3 of the gauge range.
• Replace lubricant when it becomes emulsified, blackened or contaminated with metallic particles.
• Monitor bearing-shell temperature, oil temperature, vibration and operating noise.
• Reduce machine load if bearing temperature exceeds the normal operating limit.
• Investigate the machine immediately if temperature approaches the emergency shutdown threshold.
• Typical inspection intervals can be approximately 3–6 months for minor maintenance and 1–2 years for major overhaul, subject to equipment duty and OEM requirements.

14. Common Bearing Problems and Engineering Causes

15. Engineering Procurement Information Required

For an OEM replacement quotation, buyers should provide the motor nameplate, original bearing model, shaft diameter, bearing drawing, bearing housing dimensions, motor manufacturer, motor model, power, voltage, speed, lubrication method, thrust direction and available installation drawings.

Recommended procurement workflow: Motor model → shaft data → original bearing model → bearing structure → lubrication → axial load → insulation → technical drawing → quotation → OEM production → inspection → delivery.

16. Spanish Summary

Sealocean Group, fábrica de China y proveedor OEM de componentes industriales, ofrece cojinetes de deslizamiento esféricos de Babbitt DQ, DQY, DDQ y ZQ para motores eléctricos de alta tensión, motores síncronos, generadores, ventiladores, sopladores y bombas industriales de gran tamaño.

Las series DQ y DQY están destinadas principalmente a configuraciones de cojinetes en tapas de motor, mientras que DDQ incorpora una estructura reforzada para mejorar la disipación térmica y el control de fugas de aceite. La serie ZQ utiliza una configuración de cojinete de pedestal y puede incorporar lubricación por anillo de aceite, lubricación combinada y estructuras de empuje K/T.

Entre los modelos de referencia se incluyen DQ11-125AJ, DQ18-180AJ, DQ18-200AJ, DQ22-225BJ, DQ28-280T, DQY14-125AJ, DQY22-225BJ, DDQ18-200B y ZQKT20-200. La selección final debe verificarse mediante dimensiones del eje, carcasa, velocidad, lubricación, carga axial, temperatura y requisitos de aislamiento.

17. Portuguese Summary

A Sealocean Group, fábrica na China e fornecedora OEM de componentes industriais, fornece mancais de deslizamento esféricos de Babbitt DQ, DQY, DDQ e ZQ para motores elétricos de alta tensão, motores síncronos, geradores, ventiladores, sopradores e bombas industriais de grande porte.

As séries DQ e DQY são utilizadas principalmente em configurações de mancais instalados nas tampas dos motores. A série DDQ possui uma estrutura reforçada destinada a melhorar a dissipação de calor e o controle de vazamento de óleo. A série ZQ utiliza uma configuração de mancal de pedestal, podendo trabalhar com lubrificação por anel de óleo, lubrificação combinada e estruturas de empuxo K/T.

Os modelos de referência incluem DQ11-125AJ, DQ18-180AJ, DQ18-200AJ, DQ22-225BJ, DQ28-280T, DQY14-125AJ, DQY22-225BJ, DDQ18-200B e ZQKT20-200. A seleção final deve ser confirmada através do diâmetro do eixo, dimensões da carcaça, velocidade, sistema de lubrificação, carga axial, temperatura e requisitos de isolamento elétrico.

18. FAQ — DQ, DQY, DDQ and ZQ Bearings

What is a DQ spherical sliding bearing?

DQ is a spherical sliding bearing configuration designed mainly for large motor end-shield applications, with self-aligning spherical construction.

What is the difference between DQ and DQY?

DQY is an improved configuration emphasizing compact construction, vibration control and lubrication stability for demanding large-motor applications.

What is DDQ used for?

DDQ is a reinforced configuration intended for applications where thermal management, sealing and high-power motor operating conditions require additional engineering attention.

What is a ZQ bearing?

ZQ is a pedestal spherical sliding bearing configuration that can be designed with oil-ring, combined lubrication and different thrust-pad structures.

Can Sealocean manufacture replacement bearings for RENK or MIBA applications?

Sealocean Group can evaluate OEM replacement solutions based on original drawings, dimensions, materials, lubrication conditions and operating parameters. Final compatibility must be confirmed by engineering review.

What information is required for a bearing quotation?

The preferred information includes motor model, power, voltage, speed, shaft diameter, original bearing model, bearing drawing, housing dimensions, lubrication method, axial load and insulation requirements.