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1. (WO1979000679) A HYDRAULIC DRIVE SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000679 International Application No.: PCT/GB1979/000036
Publication Date: 20.09.1979 International Filing Date: 01.03.1979
IPC:
F16H 61/46 (2010.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
H
GEARING
61
Control functions within change-speed- or reversing-gearings for conveying rotary motion
38
Control of exclusively fluid gearing
40
hydrostatic
46
Automatic regulation in accordance with output requirements
Applicants:
Inventors:
Priority Data:
8007/7801.03.1978GB
Title (EN) A HYDRAULIC DRIVE SYSTEM
(FR) SYSTEME A ENTRAINEMENT HYDRAULIQUE
Abstract:
(EN) Hydraulically driven vehicles with hydraulic wheel motors hitherto exhibited poor regulation of speed control over rough terrain. In addition, erratic loads on the prime mover (I.C. engine) resultant from varying loads on the wheel motors often causes engine stall. In the present system the I.C. engine (1) drives a hydraulic transmission pump (2) with variable displacement controlled by a swash plate (4). Encoding means (5) gives a first signal representative (A) of the engine throttle control setting. Engine speed sensor means (6) generate a second signal (B) representative of engine speed. Computing means (10) derives electronically from the first and second signals a third signal (F) applied to control motor means (19) which displaces the swash plate (4) to a position in which the load placed by the hydraulic transmission pump (2) on the engine (1) enables the engine (1) to maintain an engine speed directly related to the setting of the throttle control means.
(FR) Les vehicules a entrainement hydraulique a roues motrices entrainees hydrauliquement ont fait preuve jusqu"a present d"un mauvais reglage de la commande de vitesse sur terrains accidentes. De plus, des charges inegales s"exercant sur le premier moteur (moteur a combustion interne) et resultant des fluctuations de charges sur les roues motrices font souvent caler le moteur. Dans le present systeme, le moteur a combustion interne (1) entraine une pompe a transmission hydraulique (2) a deplacement variable commandee par un plateau oscillant (4). Des moyens codeurs (5) donnent un premier signal (A) representant le reglage de la commande des gaz du moteur. Des moyens capteurs de la vitesse du moteur (6) produisent un second signal (B) representant la vitesse du moteur. Des moyens de calcul (10) deduisent electroniquement des premier et second signaux un troisieme signal (F) applique a des moyens de commande moteurs (19) qui deplacent le plateau oscillant (4) sur une position dans laquelle la charge transmise par la pompe a transmission hydraulique (2) au moteur (1) permet a ce dernier de maintenir une vitesse moteur qui est directement fonction du reglage des moyens de commande des gaz.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)