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1. (WO1998049450) DRIVE SYSTEM FOR HYDRAULIC MOTORS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/049450 International Application No.: PCT/JP1998/001921
Publication Date: 05.11.1998 International Filing Date: 24.04.1998
Chapter 2 Demand Filed: 19.05.1998
IPC:
E02F 9/12 (2006.01) ,E02F 9/22 (2006.01) ,F15B 11/024 (2006.01) ,F15B 13/02 (2006.01)
E FIXED CONSTRUCTIONS
02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL-SHIFTING
F
DREDGING; SOIL-SHIFTING
9
Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/-E02F7/160
08
Superstructures; Supports for superstructures
10
Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
12
Slewing or traversing gears
E FIXED CONSTRUCTIONS
02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL-SHIFTING
F
DREDGING; SOIL-SHIFTING
9
Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/-E02F7/160
20
Drives; Control devices
22
Hydraulic or pneumatic drives
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
B
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
11
Servomotor systems without provision for follow-up action
02
Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member
024
by means of differential connection of the servomotor lines, e.g. regenerative circuits
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
B
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
13
Details of servomotor systems
02
Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Applicants:
KOMATSU LTD. [JP/JP]; 3-6, Akasaka 2-chome Minato-ku Tokyo 107-0052, JP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
NUNOTANI, Sadao [JP/JP]; JP (UsOnly)
ISHIZAKI, Naoki [JP/JP]; JP (UsOnly)
Inventors:
NUNOTANI, Sadao; JP
ISHIZAKI, Naoki; JP
Agent:
HAMAMOTO, Tadashi; Bansui Building 5-16, Toranomon 1-chome Minato-ku Tokyo 105-0001, JP
Priority Data:
9/10870325.04.1997JP
Title (EN) DRIVE SYSTEM FOR HYDRAULIC MOTORS
(FR) SYSTEME DE TRANSMISSION POUR MOTEURS HYDRAULIQUES
Abstract:
(EN) A drive system for hydraulic motors is provided with an operating valve (13) for supplying pressure oil discharged by a hydraulic pump (10) to a hydraulic motor (17) and for passing the pressure oil returning from the hydraulic motor to a regenerating circuit (23), and with a counterbalancing valve (30), provided between the hydraulic motor and the operating valve and having a neutral position which prevents the pressure oil returning from the hydraulic motor from flowing to the operating valve and a flow position to pass the returning pressure oil to the operating valve, so designed as to be switched to the flow position when the discharge pressure of the hydraulic pump surpasses a prescribed level and switched to the neutral position when the discharge pressure of the hydraulic pump is at or below the prescribed level, and prohibited, when switched to the flow position by the discharge pressure of the hydraulic pump, from being switched to the neutral position by the returning hydraulic oil, wherein said regenerating circuit is connected to a discharge path (11) of the hydraulic pump via a check valve (26). This enables the returning pressure oil from the hydraulic motor to be regenerated and reused.
(FR) Système de transmission pour moteurs hydrauliques. Ce système comporte une soupape (13) de commande pour alimenter un moteur (17) hydraulique en huile pressurisée provenant d'une pompe (10) hydraulique, et pour faire passer l'huile pressurisée sortant du moteur hydraulique dans un circuit (23) de régénération, et un équilibreur (30) placé entre le moteur hydraulique et la soupape de commande. L'équilibreur peut être réglé dans une position neutre, dans laquelle il empêche l'huile pressurisée sortant du moteur de s'écouler vers la soupape de commande, et une position ouverte dans laquelle il fait passer l'huile sortant du moteur vers la soupape de commande, et est conçu de manière à passer en position ouverte lorsque la pression de sortie de la pompe hydraulique dépasse un niveau prescrit et à passer en position neutre lorsque la pression de sortie de la pompe hydraulique est égale ou inférieure au niveau prescrit. Lorsqu'il est réglé en position ouverte par la pression de sortie de la pompe hydraulique, l'huile hydraulique de retour empêche l'équilibreur de revenir en position neutre, Le circuit de régénération est connecté à une voie (11) de sortie de la pompe hydraulique par un clapet (26) anti-retour. Ce système permet de régénérer et de réutiliser l'huile pressurisée sortant du moteur hydraulique.
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Designated States: US
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)