行业组件数据 · 2026

连杆

Connecting rods are precision mechanical components that convert reciprocating motion into rotational motion in engines and machinery.

技术定义与适配语境
典型 连杆 会按材料、尺寸公差、适配关系和失效风险在 机械和设备制造 中评估。

A connecting rod is a rigid mechanical linkage that connects the piston to the crankshaft in internal combustion engines, compressors, and other reciprocating machinery. It transmits the force from the piston's linear motion to the crankshaft's rotational motion, while withstanding high cyclic tensile, compressive, and bending stresses. Critical design parameters include length, cross-sectional geometry, bearing surfaces, and weight optimization for balance and inertia.

组件规格

定义
A connecting rod is a rigid mechanical linkage that connects the piston to the crankshaft in internal combustion engines, compressors, and other reciprocating machinery. It transmits the force from the piston's linear motion to the crankshaft's rotational motion, while withstanding high cyclic tensile, compressive, and bending stresses. Critical design parameters include length, cross-sectional geometry, bearing surfaces, and weight optimization for balance and inertia.
工作原理
The connecting rod operates on the principle of converting linear reciprocating motion into rotational motion. During the power stroke, combustion pressure pushes the piston downward, transmitting force through the piston pin to the connecting rod's small end. This force creates torque on the crankshaft via the connecting rod's big end, rotating the crankshaft. During other strokes, the crankshaft drives the piston back up through the connecting rod.
材料
Typically forged steel (AISI 43404140)powdered metalaluminum alloys (for lightweight applications)or titanium (high-performance). Bearing surfaces often have bronze bushings or overlay materials.
Length
Center-to-center distance between big and small ends
Weight
Critical for engine balancing
Bolt Torque
For big end cap assembly
Cross-Section
I-beam or H-beam design for strength-to-weight ratio
Big End Bore Diameter
Diameter for crankshaft journal bearing
Small End Bore Diameter
Diameter for piston pin bearing
标准
ISO 13565DIN 7526SAE J429

行业分类与别名

连杆 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Insufficient lubrication at bearing surfaces->Bearing seizure leading to rod fracture or engine seizure->Maintain proper oil viscosity and pressure, use quality bearings, ensure clearances are within specification
Material fatigue from high cyclic stresses->Fracture at stress concentration points (e.g., fillet radii)->Use high-strength materials, proper heat treatment, design with smooth transitions, implement regular inspection
Over-torquing or under-torquing of connecting rod bolts->Bolt fracture or cap separation causing catastrophic engine failure->Use torque-to-yield bolts where specified, follow manufacturer torque procedures, replace bolts during rebuilds

工业生态与工程逻辑

0
Fatigue failure from cyclic stress
1
Bearing seizure due to lubrication failure
2
Bolt loosening or fracture
3
Bending from hydraulic lock or detonation

合规与检测

tolerance
Bore diameters typically held to ±0.0005 inches (0.0127 mm), length tolerance ±0.001 inches (0.0254 mm)
test method
Dimensional inspection (CMM), magnetic particle inspection for cracks, ultrasonic testing for internal flaws, fatigue testing on hydraulic pulsators

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来自 CNFX 组件能力表的相关制造商资料。

制造商列表用于前期研究和供应商能力理解,不代表认证、排名或交易担保。

采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the main function of a connecting rod?

To transmit force from the piston to the crankshaft, converting linear motion into rotational motion.

Why are connecting rods typically forged?

Forging creates a grain structure that follows the rod's shape, providing superior strength and fatigue resistance under cyclic loading.

What are common failure modes of connecting rods?

Fatigue fracture, bearing seizure, bolt failure, and bending due to overloading or lubrication issues.

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CNFX Industrial Component Index · 机械和设备制造

数据基础

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初步技术归类
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URN:CNFX:ME:UNIT:CONNECTING_RODS