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US 11,002,235 B2Granted
Fuel injection device
AssigneeDenso Corporation
InventorsKojiro Inoue, Jun Kondo
Life of this patent
Estimating the term…
Abstract
A fuel injection device is provided with a valve body, a nozzle needle, a movable plate, and a support spring. The valve body has a control chamber therein. The control chamber is defined by a defining wall which has a dividing wall portion. The dividing wall portion divides the control chamber into an accommodation chamber and a backpressure chamber. The accommodation chamber accommodates a movable plate and a support spring. A fuel pressure in the backpressure chamber is applied to the nozzle needle. The dividing wall portion has a restriction hole fluidly connecting the accommodation chamber and the backpressure chamber with each other, and a support surface supporting the support spring.
Claims12
A fuel injection device comprising:
- a valve body which defines an injection port, a control chamber filled with a fuel, an inlet passage for introducing the fuel into the control chamber, and an outlet passage for discharging the fuel from the control chamber;
- a needle provided in a displaceable manner in the valve body by a variation in fuel pressure in the control chamber so as to open/close the injection port;
- a closing member which is accommodated in the control chamber in a displaceable manner inside the valve body so as to close an inlet opening of the inlet passage, which opens on an opening wall confronting the control chamber;
- a biasing member which is accommodated in the control chamber inside the valve body in such a manner as to bias the closing member toward the opening wall;
- and
- a cylinder provided inside the valve body in a displaceable manner, wherein
- the control chamber is defined by a defining wall which has a dividing wall portion,
- the dividing wall portion divides the control chamber into a backpressure chamber for applying a fuel pressure to the needle and an accommodation chamber accommodating the closing member and the biasing member,
- the dividing wall portion has a restriction hole fluidly connecting the accommodation chamber and the backpressure chamber with each other,
- the dividing wall portion has a support surface supporting the biasing member,
- the biasing member is provided to bias the closing member in a direction to close the inlet opening of the inlet passage, and
- the cylinder defines therein at least the backpressure chamber.
9 more elements
A fuel injection device comprising:
- a valve body which defines an injection port, a control chamber filled with a fuel, an inlet passage for introducing the fuel into the control chamber, and an outlet passage for discharging the fuel from the control chamber;
- a needle which will be displaced by a variation in fuel pressure in the control chamber so as to open/close the injection port;
- a closing member which is accommodated in the control chamber in a displaceable manner so as to close an inlet opening of the inlet passage, which opens on an opening wall confronting the control chamber;
- and
- a biasing member which is accommodated in the control chamber in such a manner as to bias the closing member toward the opening wall, wherein
- the control chamber is defined by a defining wall which has a dividing wall portion,
- the dividing wall portion divides the control chamber into a backpressure chamber for applying a fuel pressure to the needle and an accommodation chamber accommodating the closing member and the biasing member,
- the dividing wall portion has a restriction hole fluidly connecting the accommodation chamber and the backpressure chamber with each other,
- the dividing wall portion has a support surface supporting the biasing member,
- the closing member has an out orifice which limits an amount of the fuel flowing out from the control chamber, and
- a flow passage area of the restriction hole is greater than a flow passage area of the out orifice.
8 more elements
A fuel injection device comprising:
- a valve body which defines an injection port, a control chamber filled with a fuel, an inlet passage for introducing the fuel into the control chamber, and an outlet passage for discharging the fuel from the control chamber;
- a needle which will be displaced by a variation in fuel pressure in the control chamber so as to open/close the injection port;
- a closing member which is accommodated in the control chamber in a displaceable manner so as to close an inlet opening of the inlet passage, which opens on an opening wall confronting the control chamber;
- and
- a biasing member which is accommodated in the control chamber in such a manner as to bias the closing member toward the opening wall, wherein
- the control chamber is defined by a defining wall which has a dividing wall portion,
- the dividing wall portion divides the control chamber into a backpressure chamber for applying a fuel pressure to the needle and an accommodation chamber accommodating the closing member and the biasing member,
- the dividing wall portion has a restriction hole fluidly connecting the accommodation chamber and the backpressure chamber with each other,
- the dividing wall portion has a support surface supporting the biasing member, and
- the closing member has an out orifice which fluidly connects the accommodation chamber and the outlet passage.
7 more elements
Dependencies are inferred from the claim text.