Composite part, method of assembling the composite part, fuel injection valve provided with the composite part, and method of manufacturing the fuel injection valve

Claim 2

The composite part according to claim 1, characterized in that either of the inner member (12) and the cylindrical member (10; 50) is provided on its contact surface in contact with the contact surface of the other with a projection (10d; 50a), and the other is made to fit in the projection (10d; 50a).

Claim 3

The composite part according to claim 1 or 2, characterized in that the cylindrical member (10; 50) defines a stepped space therein, the inner member (12; 51) has a first and a second inner fitting member, a plurality of members are disposed between the first and the second inner fitting member fitted in the stepped space, a projection (10d; 50a) is formed on the contact surface of either of the first inner member and the cylindrical member (10; 50) and the projection (10d; 50a) is made to fit in the other, and a projection is formed on the contact surface of either of the second inner member and the cylindrical member (10; 50) and the projection (10d; 50a) is made to fit in the other.

Claim 4

The composite part according to claim 1 or 2, characterized in that the cylindrical member (10; 50) defines a stepped space therein, the inner member (12; 51) has a first inner member and a second fitting inner member, a plurality of members are disposed between the first and the second inner fittinq member fitted in the stepped space, a projection (10d; 50a) is formed on the contact surface of either of the first inner member and the cylindrical member (10; 50) and the other is made to fit in the projection, and a projection (10d; 50a) is formed on the contact surface of either of the second inner member and the cylindrical member (10; 50) and the other is made to fit in the projection (10d; 50a).

Claim 5

An assembling method of assembling a composite part including a bottomed outer cylindrical member (10; 50) having a bottom wall provided with a projection (10d; 50a) on its inner surface, and a taper hole (11) formed in its central part, and an inner cylindrical member (12; 51) having a central axial through hole and fitted in the outer cylindrical member (10; 50), said assembling method comprising: forming the projection (10d; 50a) on the inner surface of the bottom wall of the outer cylindrical member (10; 50); fitting the inner cylindrical member (12; 51) in the outer cylindrical member (10; 50) so as to rest on the inner surface of the bottom wall of the outer cylindrical member (10; 50); passing a positioning pin (13; 53) through the through hole of the inner cylindrical member (12; 51) so that a tip part thereof is fitted in the taper hole formed in the bottom wall of the outer cylindrical member (10; 50); temporarily positioning the inner cylindrical member (12; 51) so as to be coaxial with the outer cylindrical member (10; 50), and pressing the inner cylindrical member (12; 51) so as to engage with the projection of the outer cylindrical member (10; 50); and pressing joining parts of the inner and the outer cylindrical member with a staking tool so as to cause plastic flow at the joint of the joining parts to connect the inner (12, 51) and the outer cylindrical member (10; 50) coaxially.

Claim 6

The assembling method according to claim 5, characterized in that a disk (52) provided with a central taper hole (52a) is combined with the outer cylindrical member (50) by the steps of: passing a positioning pin (53) through the through hole of the inner cylindrical member (51) so that a tip part of the positioning pin is fitted in the taper hole (52a) of the disk (52); temporarily coaxially aligning the inner cylindrical member (51), the outer cylindrical member (50) and the disk (52); pressing the disk (52) so that the inner cylindrical member (51) is engaged with the projection (50a) of the outer cylindrical member (50); and coaxially connecting the inner cylindrical member (51), the outer cylindrical member (50) and the disk (52).

Claim 7

A fuel injection valve comprising: a movable valve element (43); a magnetic circuit for driving the movable valve element (43); a guide member (12) provided with a hole of a diameter suitable for guiding the movable valve element; and a nozzle (10; 50) having a bottom wall provided with a fuel injection hole; wherein the guide member (12; 51) is in engagement with a projection formed on the inner surface of the bottom of the nozzle (10; 50) or the nozzle (10; 50) is in engagement with a projection formed on the guide member (12; 51).

Claim 8

The fuel injection valve according to claim 7, characterized in that the guide member (12; 51) is held between a disk (52) provided with a fuel injection hole, and the cylindrical nozzle (10), and the guide member (12; 51) is in engagement with a projection (10d) formed on the inner surface of the bottom of the nozzle (10) or the nozzle is in engagement with a projection formed on the guide member (12; 51).

Claim 9

A method of manufacturing the fuel injection valve set forth in claim 8 comprising a movable valve element, a magnetic circuit for driving the movable valve element, a guide member (12; 51) provided with a hole (51a) of a diameter suitable for guiding the movable valve element, and a cylindrical nozzle, in which the guide member (12; 51) is held between a valve seat (52a) and a disk (52) provided with a fuel injection hole in the cylindrical nozzle (50), said method comprising: pressing the disk (52) into the nozzle (50) so that the guide member (51) engages with the projection (50a) of the nozzle; adjusting the condition of engagement of the disk (52) and the projection (50a); and adjusting the position of the disk (52) such that the distance between the opposite end of the nozzle (50) and the valve seat (52a), or the overall length of the combination of the nozzle (50) and the disk coincides with a predetermined value.

Claim 10

A method of manufacturing the fuel injection valve set forth in claim 8 comprising a movable valve element (53), a magnetic circuit for driving the movable valve element (53), a guide member (51) provided with a hole (51a) of a diameter suitable for guiding the movable valve element (53), and a cylindrical nozzle (50), in which the guide member (51) is held between a valve seat (52a) and a disk (52) provided with a fuel injection hole in the cylindrical nozzle (50), said method comprising: pressing the disk (52) into the nozzle (50) so that the nozzle (50) engages with the projection of the guide member (51); adjusting the condition of engagement of the disk (52) and the projection; and adjusting the position of the disk (52) such that the distance between the opposite end of the nozzle (50) and the valve seat (52a) or the overall length of the combination of the nozzle and the disk coincides with a predetermined value.