Solenoid Valve Mechanism and Fuel Pump
AssigneeHitachi Astemo, Ltd.
InventorsAkira IIZUKA, Shigehiko OMATA, Atsushi TAKAOKU, Moritsugu AKIYAMA
Life of this patent
Estimating the term…
Abstract
The present invention suppresses wear of a rod or a component with which the rod comes in contact. A solenoid suction valve mechanism (solenoid valve mechanism) includes a suction valve (valve), a rod engaged with the suction valve, and a magnetic attractive force generating unit that generates a magnetic attractive force that causes the rod to move in an axial direction. The rod is provided with a low-friction part. The low-friction part has a friction coefficient set such that a frictional force created between the rod and a rod contact component with which the rod comes in contact is smaller than a rotational propulsive force of the rod.
Claims7
A solenoid valve mechanism comprising:
- a valve;
- a rod engaged with the valve;
- a movable core engaged with the rod;
- a fixed core that generates a magnetic attractive force between the fixed core and the movable core;
- and
- a rod biasing spring that biases the rod in a direction of separating the rod away from the fixed core,
- wherein the fixed core includes:
- a first recess having a bottom surface with which one end of the rod biasing spring comes in contact;
- a second recess formed on the bottom surface of the first recess;
- and
- an elastic member housed in the second recess, and
- wherein the elastic member covers a whole of an inner wall surface of the second recess.
A fuel pump comprising:
- a body provided with a pressurized chamber;
- a plunger supported by the body in such a way as to be capable of reciprocation, the plunger increasing and decreasing a capacity of the pressurized chamber by the reciprocation;
- and
- a solenoid valve mechanism that discharges a fuel to the pressurized chamber,
- wherein the solenoid valve mechanism includes:
- a valve;
- a rod engaged with the valve;
- a movable core engaged with the rod;
- a fixed core that generates a magnetic attractive force between the fixed core and the movable core;
- and
- a rod biasing spring that biases the rod in a direction of separating the rod away from the fixed core,
- wherein the fixed core includes:
- a first recess having a bottom surface with which one end of the rod biasing spring comes in contact;
- a second recess formed on the bottom surface of the first recess;
- and
- an elastic member housed in the second recess, and
- wherein the elastic member covers a whole of an inner wall surface of the second recess.
Dependencies are inferred from the claim text.