Patent ID: 11951827
Assignee: KUBOTA CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 6:
7. A work vehicle comprising:
a vehicle body provided with a travel device;
a continuously variable transmission including a hydraulic pump having a swash plate that changes an output in accordance with a swash-plate angle, and a travel motor having an output shaft whose rotation speed changes in accordance with the output of the hydraulic pump and being capable of transmitting power of the output shaft to the travel device;
a travel operation member operable to a forward position to cause the vehicle body to travel forward, a reverse position to cause the vehicle body to travel backward, and a neutral position to keep the vehicle body from traveling forward or backward;
a clutch mechanism that switches a driving force having been speed-changed by the continuously variable transmission on the basis of an operation of the travel operation member among the forward position, the reverse position, and the neutral position;
a brake that brakes the travel device;
a brake operation member whose operation causes a braking action of the brake;
a controller that changes a neutral target value of a driving force output from the continuously variable transmission when the travel operation member is held at the neutral position, in accordance with an operation amount of the brake operation member;
a first planetary gear transmission that speed-changes the driving force having been speed-changed by the continuously variable transmission to a high-speed driving force; and
a second planetary gear transmission that speed-changes the driving force having been speed-changed by the continuously variable transmission to a low-speed driving force having a speed lower than that provided by the first planetary gear transmission,
wherein the clutch mechanism includes
a first clutch device capable of switching between a connected state in which a driving force from the first planetary gear transmission is transmitted to a forward drive train and a disconnected state in which the driving force from the first planetary gear transmission is not transmitted to the forward drive train, and
a second clutch device capable of switching among a connected state in which a driving force from the second planetary gear transmission is transmitted to the forward drive train, a connected state in which the driving force from the second planetary gear transmission is transmitted to a reverse drive train, and a disconnected state in which the driving force from the second planetary gear transmission is not transmitted to either one of the forward drive train and the reverse drive train.