US 12,459,517 B2
Work vehicle
Tetsuo Yamaguchi, Sakai (JP); Ryoma Iwase, Sakai (JP); and Tomonari Tsuchida, Sakai (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Nov. 16, 2023, as Appl. No. 18/511,522.
Claims priority of application No. 2022-184322 (JP), filed on Nov. 17, 2022.
Prior Publication US 2024/0166211 A1, May 23, 2024
Int. Cl. B60W 30/182 (2020.01); B60W 30/14 (2006.01); B60W 40/12 (2012.01); F16H 47/04 (2006.01)
CPC B60W 30/182 (2013.01) [B60W 30/143 (2013.01); B60W 40/12 (2013.01); F16H 47/04 (2013.01); B60W 2510/0283 (2013.01); B60W 2510/0638 (2013.01); B60W 2510/1015 (2013.01); B60W 2720/10 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A work vehicle, comprising:
an engine;
a movable body;
a hydrostatic, continuously variable transmission including:
a hydraulic pump drivable by motive power from the engine; and
a hydraulic motor drivable by pressurized oil from the hydraulic pump;
the continuously variable transmission being operable to vary the motive power from the engine and output the varied motive power;
a planetary transmission to receive the motive power from the engine and the motive power from the continuously variable transmission, composite the motive power from the engine and the motive power from the continuously variable transmission, and output the composite motive power;
a forward and backward travel switching device switchable between a forward-travel power transmission state and a backward-travel power transmission state, such that, in the forward-travel power transmission state, the forward and backward travel switching device switches the motive power from the planetary transmission into forward-travel motive power and outputs the forward-travel motive power to the movable body, and in the backward-travel power transmission state, the forward and backward travel switching device switches the motive power from the planetary transmission into backward-travel motive power and outputs the backward-travel motive power to the movable body;
an engine rotation sensor to detect a number of revolutions of the engine;
a hydraulic motor rotation sensor to detect a number of revolutions of the hydraulic motor;
an input rotation sensor to detect an input revolutions number as a number of revolutions of motive power inputted to the forward and backward travel switching device; and
a controller configured or programmed to include:
an input revolutions number calculator to calculate the input revolutions number based on a value detected by the engine rotation sensor and a value detected by the hydraulic motor rotation sensor; and
a vehicle speed controller switchable between a first vehicle-speed control mode and a second vehicle-speed control mode, such that, in the first vehicle-speed control mode, the vehicle speed controller is configured or programmed to control a vehicle speed of the work vehicle based on a value detected by the input rotation sensor, and in the second vehicle-speed control mode, the vehicle speed controller is configured or programmed to control the vehicle speed based on a value calculated by the input revolutions number calculator.