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Patent Searching and Data


Title:
VARIABLE CAPACITY PISTON PUMP
Document Type and Number:
Japanese Patent JPS61215466
Kind Code:
A
Abstract:

PURPOSE: To enable reduction of pump driving force by varying the timing for communicating/interrupting between an oil relief path and an oil relief port at the initial stage of compression stroke of plunger in variable capacity piston pump thereby regulating the actual pressurizing stroke of plunger.

CONSTITUTION: In a variable capacity piston pump, a plunger 2 is reciprocated in a fitting hole 13 of pump body 1 through the spring force of spring 16 and the cam function of cam 19 and during filling stroke (lowering) of plunger 2, a valve 4 is opened through the negative pressure in the plunger 2, a valve 4 is opened through the negative pressure in the plunger chamber 8 to suck the oil through a suction port 7. During compression stroke (upward motion) of plunger 2, the oil is pressurized in said chamber 8 and pressure fed through a delivery valve 3 to the external machineries. Here, a weighing rack 15 is operated to rotate the plunger 2 through a rotary wheel 14 thus to regulate the pressure feeding volume of pump by regulating the relation in rotary direction between the oil relief port 6 and the lead face 9 of the oil relief path 10.


Inventors:
SAITO ATSUSHI
Application Number:
JP1985000057054
Publication Date:
September 25, 1986
Filing Date:
March 20, 1985
Export Citation:
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Assignee:
YANMAR DIESEL ENGINE CO
International Classes:
F02M59/02; F02M59/26; F04B7/06; F04B13/00; (IPC1-7): F02M59/02; F02M59/26; F04B7/06; F04B13/00