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Title:
PUMP SWITCHING TYPE VARIABLE DISPLACEMENT HYDRAULIC PUMP DEVICE
Document Type and Number:
Japanese Patent JPH06280756
Kind Code:
A
Abstract:

PURPOSE: To prevent the occurrence of pulsation owing to air bubbles in working oil and prevents temperature rise by disposing a displacement switching valve to switch one hydraulic pump to a delivery state and a circulation state and an induction part to cause a bypass flow to flow in a state to cross a circulation flow.

CONSTITUTION: Two pumps 4 and 5 are juxtaposed on one and the same rotary shaft 9. In which case, a pressure chamber 62 communicated to the delivery port of a second pump 5 is communicated with the oil introduction chamber of a flow rate control valve 7. In this constitution, a capacity switching valve 8 to always hold the first pump 4 in a delivery state and switch the second pump 5 to a delivery state or a circulation state is disposed. Meanwhile, an induction part 11 is disposed at a portion where a circulation passage 92 is joined with a bypass passage 95. The induction part 11 is disposed to the tip part of a plug 1 and formed such that a bypass flow and a circulation flow are brought into a cross flow state through an induction passage 3. This constitution prevents the occurrence of pulsation owing to air bubbles in working oil and temperature rise.


Inventors:
Suzuki, Hiroyuki
Katou, Toshiya
Ikemoto, Hiroyuki
Application Number:
JP1993000096687
Publication Date:
October 04, 1994
Filing Date:
March 30, 1993
Export Citation:
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Assignee:
TOYODA MACH WORKS LTD
TOYOTA MOTOR CORP
International Classes:
B62D5/07; F04C2/344; F04C11/00; F04C14/00; F04C14/02; F04C14/26; F04C15/06; (IPC1-7): F04C11/00; B62D5/07; F04C2/344; F04C15/04
Attorney, Agent or Firm:
小川 覚



 
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