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US 4,979,599 AGranted
Work vehicle
AssigneeKubota Corporation
InventorTetsuya Nishida
Life of this patent
Estimating the term…
Abstract
In a work vehicle including a hydraulic clutch for a transmission system, the invention discloses an art of quickly yet shocklessly controlling the engagement of the clutch by properly judging a preliminary oil pressure condition and a half-clutched condition through a detection of torque developed in the transmission system.
Claims13
A work vehicle comprising:
- a hydraulic clutch;
- a torque sensor (S) for detecting an amount of transmission torque of a transmission system of a moving vehicle;
- a control valve for adjusting an amount of work oil to be fed to said hydraulic clutch;
- valve control means (A) for controlling operations of said control valve in accordance with a predetermined control scheme designed for engaging said hydraulic clutch, said control scheme including,
- a first step of opening said control valve to a first predetermined degree,
- a second step of temporarily closing said control valve to a second predetermined degree lower than said first predetermined degree and then re-opening the same again up to a full-open degree, and
- a third step of maintaining the full-open condition of said control valve achieved by said second step;
- wherein said second step is inititated when said torque sensor (S) has detected a rise in the transmission torque.
5 more elements
Dependencies are inferred from the claim text.