目前,我国生产的汽车起重机所用的提升、回转机构,大多采用柱塞式液压马达驱动齿轮减速器或蜗轮蜗杆减速器。也有采用摆线针轮减速器。这些传动形式虽比机械式传动具有很多优点,但也还存在机构笨重、效率低、噪声较大等缺点。国外汽车起重机则广泛采用由叶片式液压马达驱动行星齿轮减速器并带有摩擦片式液压制动器的传动型式。其特点: 1.由于采用行星齿轮减速器,则可把行星齿轮减速器置于提升机构的卷筒内,因而降低了提升机构的重量和减小了体积; At present, most of the lift and swing mechanisms used in China’s automobile cranes employ plunger-type hydraulic motors to drive gear reducers or worm gear reducers. Cycloid reducer is also used. Although these transmission forms have many advantages over mechanical transmissions, they also have the disadvantages of heavy machinery, low efficiency, and high noise. Foreign car cranes are widely used in the drive type of planetary hydraulic reducer driven by vane type hydraulic motor and with friction plate hydraulic brake. Its characteristics: 1. Due to the use of planetary gear reducer, the planetary gear reducer can be placed in the drum of the lifting mechanism, thus reducing the weight of the lifting mechanism and reducing the volume;