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Title:
THREE-WAY SOLENOID VALVE
Document Type and Number:
Japanese Patent JPH03265775
Kind Code:
A
Abstract:

PURPOSE: To make hydraulic power acting upon a moving piston during nonapplication of currents always constant and besides to stabilize responsiveness by forming the shape of the contact part of the moving piston into the composite conical surface of the conical surface on the top side and the conical surface of a conical angle smaller than this.

CONSTITUTION: In a three-way solenoid valve 10, the contact part 12b at the bottom of a moving piston 12 is formed into the composite surface where the conical surface of conical angles β1 and β2 are combined coaxially, and β2 > β1. That is, supporsing that the conical angle of the outer seat 11b of the body 11 is α, β01 = α° -(0.5-5°) and β°2 = α° +(10° or more). The diameter of the cross section of both these conical angles β1 and β2 is d0, and the diame ter d0 becomes the substantial diameter of the contact part 12b. And even if the contact part 12b collides against the outer seat 11b and abrades, the substan tial diameter does not change. Therefore, the hydraulic power acting upon the piston 12 during nonapplication of currents always becomes π(d2-d02).Pc /4(Pc is fuel jet pressure) and is constant. Moreover, during current application, hydraulic pressure becomes π(d2-di2). Pc/4, and becomes a fixed value different from that during nonapplication of currents.


Inventors:
KABAI KOUICHI
Application Number:
JP6359990A
Publication Date:
November 26, 1991
Filing Date:
March 14, 1990
Export Citation:
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Assignee:
NIPPON DENSO CO
International Classes:
F02M45/00; F02M51/00; F16K1/38; F16K31/06; (IPC1-7): F02M45/00; F02M51/00; F16K31/06
Attorney, Agent or Firm:
Tsutomu Adachi



 
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