Abstract: A fuel injector 10 may comprise a valve body 14 having a fuel path, a valve seat 23 fixed to a downstream end of the valve body, and a valve 25 that opens and closes a fuel injection hole of the valve seat 23. The valve may be housed within the valve body in a manner allowing sliding. An armature 31 may be attached to an upstream end of the valve 25, and a valve closing element 32 may be attached to a downstream end of the valve 25. A core 21 may be disposed at an upstream side of the armature 31. A downstream end surface of the core 21 faces an upstream end surface of the armature 31. When the valve 25 opens the fuel injection hole, the downstream end surface of the core 21 makes contact with the upstream end surface of the armature 31. A non-magnetic ring 20 may be disposed at an outer circumference side of the armature 31 and the core 21.

Abstract: A fuel injector 10 may comprise a valve body 14 having a fuel path, a valve seat 23 fixed to a downstream end of the valve body, and a valve 25 that opens and closes a fuel injection hole of the valve seat 23. The valve may be housed within the valve body in a manner allowing sliding. An armature 31 may be attached to an upstream end of the valve 25, and a valve closing element 32 may be attached to a downstream end of the valve 25. A core 21 may be disposed at an upstream side of the armature 31. A downstream end surface of the core 21 faces an upstream end surface of the armature 31. When the valve 25 opens the fuel injection hole, the downstream end surface of the core 21 makes contact with the upstream end surface of the armature 31. A non-magnetic ring 20 may be disposed at an outer circumference side of the armature 31 and the core 21.

Abstract: A fuel injector (20) may have an approximately cylindrical body (30) and a valve (40) adapted to reciprocate within a body (30). A valve seat (50) may have an opening (56) and may be positioned downstream of valve (40) such that opening (56) becomes closed when valve (40) moves downstream and opening (56) becomes open when valve (40) moves upstream. An orifice plate (60) may be coupled to the downstream side of valve seat (50). Valve seat (50) may press fit into the interior of body (30) and at least a portion of the outer surface of valve seat (50) preferably frictionally contacts the interior surface of body (30). One or more protrusions (32) may be formed on the interior surface of body (30). At least one protrusion (32) may optionally contact orifice plate (60). Further, the portion of the outer surface of valve seat (50) that is closest to valve seat opening (56) preferably does not frictionally contact the interior surface of body (30).

Abstract: A fuel injector includes a tubular core 3 which attracts an armature 10 of a valve 12 by energizing a solenoid coil 6, and an outside magnetic path forming member 7 which partly surrounds the solenoid coil 6 and which constitutes a magnetic path M together with an armature 10 and the core 3. The outside magnetic path forming member 7 is provided with an end plate 7b having a mounting hole 8, and the core 3 is provided with a flange 3a in contact with the end plate 7b. The core 3 is inserted into the mounting hole 8 of the outside magnetic path forming member 7 such that the end plate 7b comes into contact with the flange 3a of the core 3, thus readily positioning the outside magnetic path forming member 7 on the core 3.

Abstract: In an air control device including a body, an air passage formed in the body, a throttle valve disposed in the air passage for controlling an air quantity flowing in the air passage, a throttle shaft for mounting the throttle valve and extending across the aiir passage, and a pair of first and second ball bearings mounted in the body for rotatably supporting the throttle shaft; a supporting structure of the throttle valve including a first shoulder formed in the body; a first stopper fixed to the body; an inner ring of the first ball bearing engaged by interference fit with the throttle shaft; an outer ring of the first ball bearing engaged by clearance fit with the body, the outer ring being fixedly sandwiched between the first shoulder and the first stopper under the condition where a thrust is applied to the outer ring in an axial direction of the throttle shaft; a second shoulder formed in the body; a second stopper engaged by interference fit with the body; an inner ring of the second ball bearing engage

Abstract: In an air control device including a body, an air passage formed in the body, a throttle valve disposed in the air passage for controlling an air quantity flowing in the air passage, a throttle shaft for mounting the throttle valve and extending across the air passage, and a pair of first and second ball bearings mounted in the body for rotatably supporting the throttle shaft; a supporting structure of the throttle valve including a first shoulder formed in the body; a first stopper fixed to the body; an inner ring of the first ball bearing engaged by interference fit with the throttle shaft; an outer ring of the first ball bearing engaged by clearance fit with the body, the outer ring being fixedly sandwiched between the first shoulder and the first stopper under the condition where a thrust is applied to the outer ring in an axial direction of the throttle shaft; a second shoulder formed in the body; a second stopper engaged by interference fit with the body; an inner ring of the second ball bearing engaged

Abstract: In an air control device including a body, an air passage formed in the body, a throttle valve disposed in the air passage for controlling an air quantity flowing in the air passage, a throttle shaft for mounting the throttle valve and extending across the air passage, and a pair of first and second ball bearings mounted in the body for rotatably supporting the throttle shaft; a supporting structure of the throttle valve including a first shoulder formed in the body; a first stopper fixed to the body; an inner ring of the first ball bearing engaged by interference fit with the throttle shaft; an outer ring of the first ball bearing engaged by clearance fit with the body, the outer ring being fixedly sandwiched between the first shoulder and the first stopper under the condition where a thrust is applied to the outer ring in an axial direction of the throttle shaft; a second shoulder formed in the body; a second stopper engaged by interference fit with the body; an inner ring of the second ball bearing engaged