1. What Does a Torque Rod Rubber Bushing Do?

The torque rod rubber bushing is a crucial elastic component in heavy-duty truck suspension systems.
In HOWO trucks, it connects the torque rod to the frame and axle, enabling elastic movement while maintaining structural stability.

Key Functions

1) Control Axle Longitudinal Movement and Torque

During acceleration, braking, and heavy-load climbing, the drive axle produces strong pushing and torsional forces.
The rubber bushing absorbs these dynamic loads and keeps the axle properly aligned.

2) Maintain Suspension Geometry

The torque rod bushing limits:

• Axle fore–aft movement

• Side movement

• Angular displacement

This ensures correct suspension geometry and improves straight-line stability.

3) Reduce Shock, Noise & Vibration (NVH)

The rubber layer absorbs:

• Road impact

• Resonant vibration

• Structural noise

• Driveline shake

A high-quality bushing significantly improves comfort, handling stability, and vehicle durability.

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2. Construction & Materials of the Torque Rod Rubber Bushing

The AZ9631521177 bushing is a rubber–metal composite component consisting of three main parts:

2.1 Construction

① Inner Sleeve (Inner Metal Bushing)

• Works with bolts to transmit clamping force

• Carries torsional load from the torque rod

• Made from alloy steel with anti-corrosion treatment (phosphate, electrophoretic paint)

② Outer Shell (Outer Metal Housing)

• Press-fitted into the torque rod arm

• Provides structural strength and restricts deformation

• Made from thick-walled precision-machined steel tubing

③ Rubber Damping Layer

• The functional core of the bushing

• Defines stiffness, damping, NVH behavior, and durability

• Customizable rubber hardness, damping ratio, and directional stiffness

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2.2 Material Options & Performance

Hardness (Shore A)

• Standard: 65–75A

• Heavy-duty version: 75–85A

• Low-temperature flexibility: 55–60A

Manufacturing Process

• Customized rubber compounding

• Metal surface chemical treatment

• Mold compression & vulcanization

• Rubber–metal bonding (≥8 MPa)

• Dimensional and dynamic fatigue testing

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3. OEM AZ9631521177 – Features & Advantages

Fully compatible with HOWO / SINOTRUK torque rod assemblies.

① High Structural Strength

• Reinforced outer shell resists deformation

• Designed for heavy loads, high torque, and continuous operation

② Outstanding Fatigue Life

• Dynamic fatigue life: 300,000–500,000 cycles

• Maintains stiffness and damping even under extreme conditions

③ Superior Resistance to Oil, Aging & Cracking

• Suitable for harsh working environments with diesel, axle oil, and grease exposure

④ High Fitment Accuracy

Dimensional tolerances controlled within ±0.05 mm, ensuring:

• Smooth press-fitting

• Zero installation deviation

• No noise or premature wear

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4. Common Failure Symptoms & Replacement Indicators

4.1 Symptom → Cause → Inspection Method

Any of the above symptoms indicate the need for immediate replacement of AZ9631521177.

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5. Installation & Maintenance Guidelines

5.1 Press-Fit Instructions

• Use a hydraulic press—do not hammer

• Ensure the outer shell is perfectly aligned with the torque rod bore

• Do not apply petroleum-based lubricants to rubber

• Follow directional arrows if the bushing has orientation marks

5.2 Torque Instructions

Final tightening must be performed with the vehicle on the ground at normal ride height.

Torque values:
(Exact values depend on torque rod model; insert vehicle-specific data if required.)

5.3 Maintenance Recommendations

• Routine inspection every 20,000–40,000 km

• Heavy-duty usage (mining, construction, overloaded transport): inspect every 10,000–20,000 km

• Replace both ends of a torque rod at the same time for optimal performance

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6. Manufacturer Advantages – Hebei Huami New Material Technology Co., Ltd.

The following content is based on your uploaded company profile, including:
National “Little Giant” enterprise, Beijing Stock Exchange listed company, AEO Advanced Certification, national-level laboratories, 47 patents, full automotive/aviation/military system certifications.

华密新材公司介绍

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6.1 Advanced Rubber Material Formulation

• Independent development of NR/NBR/EPDM materials

• Tunable damping characteristics

• Optional low-temperature, high-temperature, oil-resistant versions

6.2 In-House Mold Development

• Full mold design & manufacturing capabilities

• High-precision, multi-cavity molds

• Faster development for new torque rod bushings

6.3 Complete Quality Testing System

Including:

• Hardness (Shore A)

• Tensile & tear strength

• Compression set

• Rubber–metal bonding strength (ASTM D429)

• Three-coordinate measurement (CMM)

6.4 Durability & Environmental Testing

• Dynamic stiffness fatigue

• High/low temperature cycling

• Salt spray & ozone aging

• Oil resistance testing

6.5 Certified Quality System

• IATF16949 Automotive Quality Management

• AS9100D Aerospace Quality System

• GJB9001C Military Quality System

• ISO9001 / ISO14001 / ISO45001

• AEO Advanced Certification

6.6 Support for Customization & Small Batches

• Flexible MOQ

• Reverse engineering available

• Heavy-duty reinforced versions available

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7. Technical Parameter Table

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8.  FAQ

1. What trucks use the AZ9631521177 torque rod bushing?

It fits HOWO/SINOTRUK heavy-duty trucks; confirm with torque rod model.

2. How long does the bushing last?

Typical lifespan: 200,000–400,000 km, depending on load and road conditions.

3. Can the hardness be customized?

Yes—between 55A and 85A, depending on application requirements.

4. What are the main failure indicators?

Cracks, delamination, noise, axle movement, uneven tire wear.

5. Do you offer test reports?

Yes—hardness, CMM, tensile, tear, bonding strength, fatigue test reports.

6. Should bushings be replaced in pairs?

Yes, replacing both sides of a torque rod ensures consistent performance.