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现代汽车起重机多采用液压式起升机构。它由起升装置、驱动装置和控制装置3部分构成。起升装置由卷筒、卷筒离合器、卷筒制动器、卷筒轴、钢丝绳、吊钩和起升高度限位器等组成;起升驱动装置由起升液压马达及其减速器组成;起升控制装置由手动分配阀、离合器控制阀、液压助力缸、平衡阀及液压管路等组成。起升液压马达,可分为定量轴向柱塞型和变量轴向柱塞型两种。1.定量液压马达的维修 通过改变发动机的转速来控制卷筒转速,按制动的型式又可分为机械制
Modern truck crane hydraulic lifting mechanism to use more. It consists of lifting device, drive and control device 3 parts. The lifting device is composed of a reel, a reel clutch, a reel brake, a reel shaft, a wire rope, a hook and a lifting height stopper, etc. The lifting drive device is composed of a lifting hydraulic motor and a decelerator thereof, Control device consists of manual distribution valve, clutch control valve, hydraulic booster cylinder, balance valve and hydraulic piping. Lifting hydraulic motor can be divided into quantitative axial piston type and variable axial piston type two. 1. Quantitative hydraulic motor repair by changing the engine speed to control the drum speed, according to the type of braking can be divided into mechanical