行业组件数据 · 2026

活塞

Hydraulic piston that converts fluid pressure into mechanical force in brake calipers

技术定义与适配语境
典型 活塞 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 cylindrical component within a brake caliper that moves linearly under hydraulic pressure to press brake pads against the rotor, creating friction to decelerate or stop a vehicle. It operates within a sealed bore and is critical for force transmission in disc brake systems.

组件规格

定义
A cylindrical component within a brake caliper that moves linearly under hydraulic pressure to press brake pads against the rotor, creating friction to decelerate or stop a vehicle. It operates within a sealed bore and is critical for force transmission in disc brake systems.
工作原理
Operates on Pascal's principle: hydraulic pressure applied to brake fluid creates equal pressure throughout the system, forcing the piston outward against the brake pad. When pressure is released, seals retract the piston slightly to prevent drag.
材料
Typically forged or machined from aluminum alloys (A3566061-T6) for lightweight applicationsor steel (41401045) for heavy-duty use. Surface treatments include hard anodizing (25-50μm)nickel platingor DLC coatings for wear resistance.
Stroke
1-3mm
Diameter
30-60mm (passenger vehicles), 70-120mm (commercial)
Hardness
80-90 HRB (aluminum), 25-35 HRC (steel)
Surface Finish
Ra 0.4-0.8μm
Temperature Range
-40°C to +200°C
Operating Pressure
80-120 bar
标准
ISO 15484DIN 74324SAE J431JIS D 2601

行业分类与别名

活塞 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

Corrosion from road salt/moisture->Piston sticks in bore, uneven braking->Protective coatings, regular cleaning, sealed dust boots
Excessive heat from aggressive braking->Piston material degradation, seal hardening->High-temp materials, cooling fins, proper pad selection
Contaminated brake fluid->Seal swelling/ deterioration, corrosion->Regular fluid changes, sealed systems

工业生态与工程逻辑

0
Hydraulic fluid leakage
1
Piston seizure due to corrosion
2
Overheating leading to brake fade
3
Seal failure causing pressure loss

合规与检测

tolerance
Diameter: ±0.02mm, Roundness: 0.01mm, Surface finish: Ra 0.4-0.8μm
test method
Pressure testing at 150% operating pressure, cycle fatigue testing (100k cycles), salt spray corrosion testing per ISO 9227

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 causes brake piston sticking?

Corrosion from moisture ingress, contaminated brake fluid, seal degradation, or lack of lubrication on sliding surfaces. Regular maintenance and fluid changes prevent this.

Can pistons be replaced individually?

Yes, but typically replaced as a caliper rebuild kit including seals and dust boots. Matching piston material and dimensions to original specifications is critical.

How do floating vs fixed caliper pistons differ?

Floating calipers have pistons on one side only and slide laterally; fixed calipers have pistons on both sides and don't move. Both use similar piston principles.

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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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