| 摘要 |
Trailer (1) such as a caravan and auxiliary drive (20) therefor. This auxiliary drive consists of parts acting on the wheels such as drive rolls (13,33,53,73,93). These drive rolls can be moved from and to the opposing wheels of an axle. According to the invention, this movement takes place in common as a result of the fact that both rotatable drive members are mounted on a common crossbar (13,34,54,74,94) which can be displaced back and forth from and to both wheels using a common motor (12,32,52,72,92). Optionally, a possibility for adjustment can exist between the crossbar and each of the separate drive members. In this way, the complex construction known in the art for the displacing of drive rolls or the like to a wheel may be dispensed with.
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