本文对美国和日本生产的客车空调制冷压缩机和西德空调客车的数量发展作了比较。在客车空调的初期(1955/1960年以及其后),双缸压缩机占了优势,后来是四缸、五缸、七缸,至现在,在西德约50％是10缸压缩机。依靠测量数据对一种新型可变排量压缩机作一简短的叙述,这些压缩机类型在美国和西德自1985～1986年以来已被安装在客车上。 This article compares the development of passenger car air conditioning and refrigeration compressors manufactured in the United States and Japan and the development of air conditioners in West Germany. In the early days of passenger air-conditioning (1955/1960 and beyond), twin-cylinder compressors dominated and were later four-cylinder, five-cylinder and seven-cylinder, and up to now, about 50% of West Germany are 10-cylinder compressors. A brief account of a new type of variable displacement compressor that relies on measurement data has been installed on buses in the United States and West Germany from 1985 to 1986.