| 摘要 |
<p>A four-wheel vehicle drive system includes a final reduction gear (25), a central differential gear assembly (10), a front and a rear wheel differential gear assembly (60, 89). The central differential gear assembly (10) includes a housing (11), a first and a second side bevei gear (16,17), a bevel pinion (14) and a distribution ratio change sleeve (27) rotating the bevel pinion (14). The housing (11) is fixed to and coaxially rotatable with the final reduction gear (25) about its first rotational axis (X). The first and second side bevel gears (16,17) are rotatable at different speeds about rotational axes aligned with the first rotational axis (X). The bevel pinion (14), which engages with the first and second side bevel gear (16,17). is rotatably mounted on the housing (11) about a second rotational axis (Z) perpendicular to the first rotational axis (X). The front wheel differential gear assembly (60) includes a housing (61) and two side bevel gears (66,67). The housing (61) is connected to the first side bevel gear (16) of the central differential gear assembly (10). The two front wheel side bevel gears (66,67) are rotatable at different speeds about rotational axes (X) and are held in driving engagement with a front wheel pinion gear (64,65) rotatably mounted on the housing (61). The rear wheel differential gear assembly (89) includes a housing connected to the second side bevel gear (17) of the central differential gear assembly (10) and two rear wheel side bevel gears able at different speeds about rotational axes.</p> |
