Working vehicle with HST
AssigneeYanmar Co., Ltd.
InventorsHitoshi Nomura, Keiichi Hayashi, Hidehiro Yuki
Life of this patent
Estimating the term…
Abstract
A working vehicle with an HST in which over-rotation of a hydraulic pump in the HST or the pump input shaft thereof is prevented when a main clutch is disconnected during a run. When a main clutch connection/disconnection detection means detects the disconnection state of the main clutch during a run, a control means judges whether a vehicle speed detected by a vehicle speed detection means is at least a set speed or not, and if the vehicle speed is at least the set speed, the movable swash plate of the hydraulic pump in an HST is controlled to sustain it at the current inclination angle.
Claims9
A working vehicle with a hydraulic stepless transmission (HST) having a hydraulic pump and a hydraulic motor, comprising:
- a main clutch disposed between the HST and an engine;
- a power transmission means disposed between the HST and a wheel;
- an actuator changing slant angle of a movable swash plate of the hydraulic pump of the HST;
- and
- a control means controlling actuation of the actuator, wherein:
- a main clutch connection/disconnection detection means detecting connection status of the main clutch and a vehicle speed detection means detecting vehicle speed are provided,
- the main clutch connection/disconnection detection means and the vehicle speed detection means are connected to the control means,
- when the vehicle speed detected by the vehicle speed detection means is not less than a set speed at a time of disconnecting the main clutch, the slant angle of the movable swash plate of the hydraulic pump is held at an angle at which the main clutch is disconnected, and
- when the vehicle speed detection means does not detect the vehicle speed, a slant angle of the movable swash plate of the hydraulic pump is controlled so that vehicle speed is smaller than the set speed.
Dependencies are inferred from the claim text.