Title:
CUSHIONING DEVICE OF HYDRAULIC CYLINDER
Document Type and Number:
Japanese Patent JPS60132101
Kind Code:
A
Abstract:
PURPOSE:To optimize the bleed-off timing and cushioning effect by a method wherein an unloading solenoid valve and a restriction solenoid valve are controlled based upon detection signals of the stroke and speed of a piston. CONSTITUTION:A hydraulic cylinder 1 is provided with a cushioning chamber 10 and a restriction chamber 11. A restriction solenoid valve 3 is connected to the restriction chamber 11. An unloading solenoid valve 2 is connected to a high pressure chamber 6. A stroke sensor 18 and a speed sensor 19 are provided at the end of the hydraulic cylinder 1 so as to control the unloading solenoid valve 2 and the restriction solenoid valve 3 based upon the stroke and speed of a piston. As a result, the bleed-off action and the restriction action can be controlled regardless of the change of viscosity of oil and accordingly the optimum breed-off timing and cushioning effect can be obtained.
Inventors:
INOUE ATSUSHI
NAKAZATO MASAKAZU
NAKAZATO MASAKAZU
Application Number:
JP24168683A
Publication Date:
July 15, 1985
Filing Date:
December 21, 1983
Export Citation:
Assignee:
KAYABA INDUSTRY CO LTD
International Classes:
F15B11/00; (IPC1-7): F15B11/00
Domestic Patent References:
| JPS5646103A | 1981-04-27 | |||
| JPS512597A | 1976-01-10 |
Attorney, Agent or Firm:
Amano Izumi