Propelling clutch apparatus for a working vehicle

Details Propelling clutch apparatus for a working vehicle Propelling clutch apparatus for a working vehicle

1988-12-06

1990-05-15

Reese, Randolph A.

192 clutches and power-stop control

Clutches

Progressive engagement

192 8715, 192103F, 192109F, F16D 1106

Patent

active

049249835

ABSTRACT:
A propelling clutch apparatus for a working vehicle comprises a friction type hydraulic clutch mounted on a propelling line, a valve for adjusting an oil pressure applied to the hydraulic clutch, a sensor for detecting angular acceleration of a rotary shaft included in the propelling line, and a control unit for controlling the hydraulic clutch in response to a change in a vehicle running state. The control unit effects controls in three stages. The first stage includes a preliminary step of narrowing spaces between friction disks of the hydraulic clutch by applying the oil pressure at a maximum level to the hydraulic clutch for a predetermined time from receipt of a clutch engaging command, and a subsequent main step of applying the oil pressure with predetermined characteristics. The second stage is for maintaining the hydraulic clutch in a half-clutch state when the angular acceleration in an accelerating direction or a decelerating direction reaches a predetermined value. The third stage is for fully engaging the hydraulic clutch.

REFERENCES:
patent: 3649083 (1972-03-01), Depenheuer
patent: 3938631 (1976-02-01), Smith
patent: 3990553 (1976-11-01), Holzinger et al.
patent: 4057132 (1977-11-01), Hatton et al.
patent: 4676349 (1987-06-01), Coutant

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