To provide a hydraulic-mechanical transmission whose clutch switching is possible without being affected by an inclination of an actual transmission gear ratio.
The hydraulic-mechanical transmission is equipped with an HST 10 including a hydraulic pump 11 and a hydraulic motor 12, a planetary gear mechanism 20, a low-speed side clutch 31a, and a high-speed side clutch 1b, and a controller 100 for performing control so that an actual transmission gear ratio Rt becomes a transmission gear ratio command value Ro. The controller 100 is equipped with a map 110 for showing a computational expression used to compute an inclination angle corresponding to a transmission gear ratio R. When a post-FB inclination angle command value has reached a given switching inclination angle c, the transition to a switching control mode is made which is intended for switching between a low-speed mode and a high-speed mode.
| JP4456213 | Crawler tractor |
| JPH0611440 | [Name of invention] Axle drive device |
| JP4230790 | transmission |
KURODA AKISHI
KUBOTA YUKIO
| JP2007078160A | 2007-03-29 | |||
| JP2007120753A | 2007-05-17 | |||
| JP2000266180A | 2000-09-26 | |||
| JP2003130177A | 2003-05-08 | |||
| JPH1182676A | 1999-03-26 | |||
| JP2000127780A | 2000-05-09 | |||
| JP2001193833A | 2001-07-17 |
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