TB Type Rotary Shaft Oil Seal Double Lip Shaft Sealing Ring

1. Product Overview

TB type oil seal is a double-lip radial shaft sealing part with a full-covered metal frame. It is specially designed for medium-low pressure and medium linear speed rotating shaft sealing scenarios. Featuring high rigidity, anti-deformation performance, excellent oil sealing and dustproof effects, this seal ensures stable and long-lasting sealing performance for mechanical rotating systems, which is widely applicable to various industrial and automotive mechanical equipment.

2. Structural Features

• Full-covered Metal Frame: Adopts carbon steel or stainless steel full-wrapped metal shell with high structural rigidity. It is not easy to deform under high load and large shaft diameter conditions, ensuring accurate assembly positioning and good coaxiality. The outer diameter maintains stable interference fit with the mounting hole.

• Dual-lip Sealing Design: Equipped with main sealing lip and auxiliary dust-proof lip. The main lip is matched with a tension spring to provide continuous radial clamping force, which tightly fits the shaft surface to prevent lubricating oil leakage. The auxiliary lip effectively blocks external dust, mud and impurities, protecting the main lip and internal bearings from wear and pollution.

• Durable Spring Structure: Built-in high-strength stainless steel / carbon steel garter spring, with stable elastic force, permanent tension compensation, and long-term reliable sealing effect.

3. Standard Material & Working Parameters

3.1 Common Materials & Temperature Resistance

• NBR (Nitrile Butadiene Rubber): Standard material. Temperature range: -30℃ to +100℃. Excellent resistance to mineral oil and grease, cost-effective, suitable for most conventional working conditions.

• FKM (Fluoro Rubber): High temperature & corrosion resistant type. Temperature range: -20℃ to +200℃. Resistant to high temperature, acid, alkali and various chemical media, suitable for harsh working environments.

• HNBR (Hydrogenated Nitrile Rubber): Temperature range: -30℃ to +150℃. Features superior wear resistance, oil resistance and aging resistance, with longer service life than ordinary NBR.

• ACM (Acrylic Rubber): Temperature range: -20℃ to +150℃. Special for high-temperature gearbox oil and transmission oil scenarios.

3.2 Working Condition Parameters

• Maximum Pressure: ≤ 0.05 MPa (low pressure rotary sealing)

• Maximum Linear Speed: ≤ 12 m/s

• Hardness: Shore A 70-90 (customizable)

4. Product Advantages

• High Structural Stability: Full metal frame enhances overall rigidity, effectively avoiding deformation and failure caused by vibration and load pressure during equipment operation.

• Dual-protection Sealing: Double-lip structure realizes oil sealing and dust isolation at the same time, greatly reducing equipment failure rate and extending mechanical service life.

• Wide Compatibility: Multiple material options adapt to different temperatures, media and working conditions, covering most industrial and automotive sealing needs.

• Precise Installation: The metal outer diameter ensures precise interference fit with the shell hole, firm installation, strong vibration resistance and no offset.

• Cost-effective: Stable performance, low failure rate and long service life, reducing equipment maintenance and replacement costs.

5. Application Scope

TB type oil seals are widely used for rotating shaft sealing of various mechanical equipment, including automotive systems, industrial transmission equipment and engineering machinery:

• Automotive field: Engine crankshaft, gearbox, differential, transmission system

• Industrial equipment: Reducer, gearbox, motor, water pump, fan

• Engineering machinery: Construction machinery, agricultural machinery, mining equipment (dust and muddy working conditions)

• General machinery: All kinds of medium-low speed and medium-low pressure rotary shaft sealing scenarios

6. Selection Instructions

• Confirm core dimensions: shaft diameter, hole diameter, seal width (prefer standard universal sizes)

• Select appropriate rubber material according to actual working temperature, contact medium and rotating speed

• TB type is preferred for large shaft diameter and high load working conditions; TC type is recommended for high-speed and heavy-dust environments

• Ensure precise processing of the mounting shell hole to guarantee coaxiality and interference fit effect

7. Product Difference (TB vs TC)

• TB Type: Full-covered metal frame with bare metal outer diameter, super high rigidity, anti-deformation, optimal for large shaft diameter and high-load sealing scenarios

• TC Type: Half-frame structure with full rubber-coated outer diameter, better high-speed resistance and dustproof performance, suitable for high-speed and severely polluted working environments