Bibdoc 2024 - Les maillons de la chaine du livre face aux enjeux écologiques.pdf
Principes De Base
1. PRINCIPES DE BASE Copyright Eaton Hydraulics 2000 Steve Skinner, Eaton Hydraulics, Havant, UK
2. REPONSE: Un système hydraulique a pour but d’utiliser la pression d’un fluide, afin de transmettre cette puissance de l’endroit où elle est crée jusqu’à l’endroit où est doit être utilisée. QUESTION: Qu’est ce qu’un système hydraulique?
121. DISTRIBUTEUR VERIN REDUCTEUR DE DEBIT FILTRE AU REFOULEMENT LIMITEUR DE PRESSION POMPE 1 SENS DE FLUX REPRESENTATION SCHEMATIQUE
122. M DISTRIBUTEUR VERIN REDUCTEUR DE DEBIT FILTRE AU REFOULEMENT LIMITEUR DE PRESSION POMPE 1 SENS DE FLUX MOTEUR ELECTRIQUE REPRESENTATION SCHEMATIQUE
130. 1 sec - 9.81 m/sec 2 sec - 19.62 m/sec 3 sec - 29.43 m/sec 0 sec - 0 m/sec (Soit plus de 100km/h en moins de 3 secondes ) ACCELERATION GRAVITATIONNELLE = 9.81 mètres / sec 2 ATTRACTION TERRESTRE : GRAVITE 1 kg
131. Force = Masse x Acceleration 1 Newton = 1 kilogramme x 1 mètre/sec 2 9.81 N = 1 kg x 9.81 m/s 2 UNITE DE FORCE 1 kg Une Masse de 9.81 N Pèse :
132. ( 1 N = 0.1 kg approximativement) 1 newton par mètre carré = 1 pascal (Pa) 1 kilo pascal = 1 000 Pa 1 mega pascal = 1 000 000 Pa 1 bar = 100 000 Pa 1 bar = 1 daN / 1 cm 2 (approx) UNITES DE PRESSION 1 mètre 1 mètre 1 mètre 2 1 newton
133. FORMULAIRE PRESSION (Pa) = FORCE (N) SURFACE (m 2 ) PRESSION (bar) = FORCE (daN) SURFACE (cm 2 ) 1 bar = 1 daN / 1 cm 2
141. P1 P2 Q Q P1 - P2 = P P ~ S x Q 2 Exemple:Pour doubler le débit, il faudra augmenter 4 fois la pression PRESSION GENERE PAR UNE RESTRICTION ET PERTES DE CHARGES S
145. PUISSANCE Levier Conduite de refoulement : Génération du débit Conduite d’aspiration
146. Moteur électrique Puissance hydraulique= Débit x Pression PUISSANCE Conduite de refoulement : Génération du débit PUISSANCE ( kW ) = PRESSION ( bar ) x DEBIT ( l/min ) 600
147. P1 P2 Q Q PUISSANCE A L’ENTREE = P1 x Q PUISSANCE A LA SORTIR= P2 x Q SI P2 < P1 ALORS ( P SORTIE ) < ( P ENTREE ) LA DIFFERENCE DE PUISSANCE SE TRANSFORME EN CHALEUR POUR UNE HUILE MINERALE AUGMENTATION de 1ºC par P de 17.5bars PUISSANCE
164. Copyright Eaton Hydraulics 2000 Steve Skinner, Eaton Hydraulics, Havant, UK PRINCIPES DE BASE
Editor's Notes
Notes Hydraulic actuation includes both linear motion (cylinders) for the movement of an excavator bucket, arm and boom together with rotary motion (motors) used for swing and travel.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
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Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
