초록 ▼

A poppet type solenoid valve used in an electronically controllable vehicle hydraulic brake system is proposed which suppresses sound and vibration and simultaneously eliminates malfunction. For these effects, the following conditions have to be satisfied: FSP/(r2-B2)SP·St2/(r2-B2)>29 (2) wherei

A poppet type solenoid valve used in an electronically controllable vehicle hydraulic brake system is proposed which suppresses sound and vibration and simultaneously eliminates malfunction. For these effects, the following conditions have to be satisfied: FSP/(r2-B2)SP·St2/(r2-B2)>29 (2) wherein FSPis the force of the spring, r is the tip diameter of the poppet, St is the stroke of the poppet, and B is the diameter of the area of the poppet where the valve-opening force by hydraulic pressure does not work on the poppet under the Bernoulli effect.

대표청구항 ▼

1. A solenoid valve comprising a poppet, an orifice, a valve seat provided at a mouth portion of said orifice, a solenoid for bringing the tip of said poppet into contact with said valve seat by applying a valve-closing force to said poppet, and a spring for applying a force in a valve-opening direc

1. A solenoid valve comprising a poppet, an orifice, a valve seat provided at a mouth portion of said orifice, a solenoid for bringing the tip of said poppet into contact with said valve seat by applying a valve-closing force to said poppet, and a spring for applying a force in a valve-opening direction to said poppet, whereby a flow passage around said valve seat is opened and closed by said poppet and the fluid to be controlled is allowed to flow through the valve while the valve is open, characterized in that the following conditions are satisfied, FSP/(r2-B2)SP·St2/(r2-B2)>29 (2) wherein FSPis the force of said spring, r is the tip diameter of the poppet, St is the stroke of the poppet, and B is the diameter of the area of said poppet where the valve-opening force by hydraulic pressure does not work on said poppet under the Bernoulli effect. 2. The solenoid valve as claimed in claim 1 wherein the following conditions Fsp/(r2-B2)sp·St2/(r2-B2)>40 are satisfied. 3. A solenoid valve comprising a poppet, an orifice, a valve seat provided at a mouth portion of said orifice, a solenoid for bringing the tip of said poppet into contact with said valve seat by applying a valve-closing force to said poppet, and a spring for applying a force in a valve-opening direction to said poppet, whereby a flow passage around said valve seat is opened and closed by said poppet and the fluid to be controlled is allowed to flow through the valve while the valve is open, characterized in that the following conditions are satisfied, FSP/(r2-B2)SP·St2/(r2-B2)>29 (2) wherein FSPis the force of said spring, r is the tip diameter of said poppet, St is the stroke of said poppet, and B is the diameter of the area of said poppet where the valve-opening force by hydraulic pressure does not work on said poppet under the Bernoulli effect, wherein the tip diameter of said poppet is 1.2 to 1.8 mm, the orifice diameter is 0.7 mm, the angle of the seat surface of said valve seat is 120 degrees, and B is 1.1 mm. 4. The solenoid valve as claimed in claim 3 wherein the following conditions Fsp/(r2-B2)sp·St2/(r2-B2)>40 are satisfied.