§ 393.207 Suspension systems.
发布02-19
生效03-23
摘要总结AI 辅助解读
本法规为美国联邦法规第49篇（交通）关于商用车悬挂系统的安全技术标准。核心要求涵盖车轴对齐、钢板/螺旋/扭杆弹簧无裂纹破损，以及空气悬挂系统的压力调节阀启动阈值（制动系统气压≥55 psi）、车身水平度及泄漏率限制（5分钟≤3 psi）。特别针对双轴空气悬挂拖车的排气控制装置设定了严格限制，禁止单轴排气功能除非具备低速锁定或同步排气机制。该标准直接影响跨境陆运车辆的DOT检查合规性及车辆准入资格。
- (a) Axles. No axle positioning part shall be cracked, broken, loose or missing. All axles must be in proper alignment.
- (b) Adjustable axles. Adjustable axle assemblies shall not have locking pins missing or disengaged.
- (c) Leaf springs. No leaf spring shall be cracked, broken, or missing nor shifted out of position.
- (d) Coil springs. No coil spring shall be cracked or broken.
- (e) Torsion bar. No torsion bar or torsion bar suspension shall be cracked or broken.
- (f) Air suspensions. The air pressure regulator valve shall not allow air into the suspension system until at least 55 psi is in the braking system. The vehicle shall be level (not tilting to the left or right). Air leakage shall not be greater than 3 psi in a 5-minute time period when the vehicle's air pressure gauge shows normal operating pressure.
- (g) Air suspension exhaust controls. The air suspension exhaust controls must not have the capability to exhaust air from the suspension system of one axle of a two-axle air suspension trailer unless the controls are either located on the trailer, or the power unit and trailer combination are not capable of traveling at a speed greater than 10 miles per hour while the air is exhausted from the suspension system. This paragraph shall not be construed to prohibit—
- (1) Devices that could exhaust air from both axle systems simultaneously; or
- (2) Lift axles on multi-axle units.
[53 FR 49402, Dec. 7, 1988, as amended at 70 FR 48055, Aug. 15, 2005]