Title:
HYDRAULICALLY DRIVING DEVICE WITH WARMING-UP FUNCTION
Document Type and Number:
Japanese Patent JPS5954805
Kind Code:
A
Abstract:
PURPOSE:To automate the warming-up control by providing a warming-up means which keeps a center-bypass type direction change-over valve in the specified opening position in response to a warming-up instruction. CONSTITUTION:A proportional control solenoid valve 18 is connected via a shuttle valve 19 to the pilot pipe passage of a center-bypass type direction change- over valve 2 and a warming-up control circuit 16 and a temperature detector 15 are connected to the controlling part of the proportional control solenoid valve 18. When the temperature of working oil is reduced below the specified temperature at which warming-up may be needed, the signal from the temperature detector 15 actuates a warming-up control circuit 16 so that the pilot pressure signal of a specified level from the proportional control solenoid valve 18 is sent to the center-bypass type directional change-over valve 2 to keep it in the specified opening position. Accordingly, the warming-up may be controlled not manually but automatically.
Inventors:
AOYANAGI YUKIO
ICHIYAMA SHIYUUICHI
KANEHARA MASAKI
UNO KEIICHIROU
ICHIYAMA SHIYUUICHI
KANEHARA MASAKI
UNO KEIICHIROU
Application Number:
JP16311982A
Publication Date:
March 29, 1984
Filing Date:
September 21, 1982
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F9/20; F04B49/00; F15B21/04; (IPC1-7): F15B21/04
Domestic Patent References:
| JPS51664A | 1976-01-06 | |||
| JPS5378402A | 1978-07-11 |
Attorney, Agent or Firm:
Kenjiro Take
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