SPEED CHANGING METHOD FOR A MECHANICAL AND HYDRAULIC TRANSMISSION

摘要

A mechanical and hydraulic transmission for use in a vehicle having a mechanical transmission (31) and a static hydraulic transmission (2, 20) disposed in parallel with each other between an engine and an output shaft (19), for preventing shocks otherwise produced when a clutch brake for advancing and backing is switched with the vehicle speed kept at zero and when a clutch brake is switched when the speed is changed from a first speed to a second speed. A brake (14) for the first speed and a clutch (10) for the second speed are simultaneously brought into engagement at the first speed where power transmission and switching between advancing and backing are effected by means of the static hydraulic transmission, and at the second speed and higher, either of the brake (8) for advancing and the brake (7) for backing and either of the clutch (10) for the second speed and the brake (13) for the third speed are simultaneously brought into engagement.