行业组件数据 · 2026

推杆

A pushrod is a mechanical linkage component in brake master cylinders that transfers force from the brake pedal to the piston.

技术定义与适配语境
典型 推杆 会按材料、尺寸公差、适配关系和失效风险在 汽车制造 中评估。

A pushrod is a precision-engineered cylindrical component within a brake master cylinder assembly that serves as the primary force transmission element. It converts the linear mechanical force applied by the driver's foot on the brake pedal into hydraulic pressure by actuating the master cylinder piston. Typically mounted between the brake pedal lever and the master cylinder piston, it operates under high mechanical stress and must maintain strict dimensional accuracy to ensure proper brake system function and pedal feel.

组件规格

定义
A pushrod is a precision-engineered cylindrical component within a brake master cylinder assembly that serves as the primary force transmission element. It converts the linear mechanical force applied by the driver's foot on the brake pedal into hydraulic pressure by actuating the master cylinder piston. Typically mounted between the brake pedal lever and the master cylinder piston, it operates under high mechanical stress and must maintain strict dimensional accuracy to ensure proper brake system function and pedal feel.
工作原理
The pushrod operates on the principle of direct force transmission through rigid linkage. When the brake pedal is depressed, the pedal lever pivots, pushing the pushrod forward. This linear motion is transferred directly to the master cylinder piston, which then compresses the brake fluid in the primary chamber. The pushrod must maintain alignment and minimal deflection to ensure efficient force transfer without energy loss, contributing to precise brake modulation and response.
材料
Typically made from medium-carbon steel (e.g.AISI 10454140) or alloy steeloften heat-treated (quenched and tempered) to achieve a hardness of 35-45 HRC for strength and wear resistance. Some high-performance or corrosion-resistant applications may use stainless steel (e.g.17-4PH) or aluminum alloys with hardened tips.
Length
100-300 mm (varies by vehicle)
Diameter
6-12 mm
Hardness
35-45 HRC
Thread Type
M8x1.25, M10x1.5, or vehicle-specific
Surface Finish
Ground or polished, Ra ≤ 1.6 μm
Straightness Tolerance
≤ 0.1 mm over length
标准
ISO 4038DIN 743SAE J429

行业分类与别名

推杆 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

Material fatigue from repeated stress cycles->Fracture or permanent deformation->Use fatigue-resistant steels, apply shot peening, and implement regular inspection protocols
Corrosion in harsh environments->Reduced diameter, pitting, or seizing in bushings->Apply corrosion-resistant coatings (e.g., zinc plating, phosphate), use stainless steel in critical applications
Improper installation or adjustment->Incorrect brake pedal feel, reduced braking efficiency->Follow OEM torque specifications, use alignment tools during assembly, verify free play adjustment

工业生态与工程逻辑

0
Fatigue failure due to cyclic loading
1
Corrosion leading to seizing or reduced strength
2
Improper length causing brake drag or insufficient pedal travel
3
Misalignment inducing side loading and premature wear

合规与检测

tolerance
Dimensional tolerances per ISO 2768-m, straightness within 0.1 mm, hardness variation ±2 HRC
test method
Dimensional inspection via CMM, hardness testing per ASTM E18, fatigue testing under simulated brake pedal cycles, salt spray testing per ASTM B117 for corrosion resistance

制造该组件的工厂

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 primary function of a pushrod in a brake master cylinder?

The pushrod transmits mechanical force from the brake pedal to the master cylinder piston, initiating hydraulic pressure in the braking system.

How do I know if a pushrod needs replacement?

Signs include excessive brake pedal free play, uneven braking, unusual noises during pedal application, or visible wear/corrosion on the rod surface.

Are pushrods interchangeable between different vehicle models?

No, pushrods are typically model-specific due to variations in length, thread type, and mounting geometry; always use OEM or verified compatible parts.

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CNFX Industrial Component Index · 汽车制造

数据基础

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初步技术归类
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URN:CNFX:ME:UNIT:PUSHROD