Arrangement for clamping injectors

Details Arrangement for clamping injectors Arrangement for clamping injectors

1999-11-10

2001-08-07

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S469000

Reexamination Certificate

active

06269798

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to an arrangement for clamping three neighboring injectors onto a cylinder head of an engine, and more particularly to such an arrangement that is reduced in both weight and manufacturing cost.
2. Description of the Related Art
In general, as illustrated in
FIG. 3
of the accompanying drawings, if an engine (diesel or gasoline engine) has an even number of cylinders, each two injectors “a” are first placed in respective holes formed in a cylinder head, and then clamped by an H-shaped bracket “d” which has an opening “b” in its center and two pairs of arms “c” extending in opposite directions from the vicinity of the center opening “b”. Each injector “a” has a block-like projection “e” at its top, which provides two flat crescent-shaped areas on both sides of the projection. Each pair of arms “c” of the H-shaped bracket “d” press the two crescent-shaped areas of each injector “a” downwards when the bracket “d” is secured on the cylinder head by threading a nut “g” over a screw shaft “f” extending upwards from the cylinder head. In this manner, each two injectors are clamped at one time. Such an arrangement is disclosed in, for example, Japanese Patent Application, Laid-Open Publication No. 10-176629.
However, if the engine has an odd number of injectors, e.g., three, then the above-described injector clamping arrangement (
FIG. 3
) is not employable. One possible way of clamping three linearly arranged injectors by a single bracket is illustrated in
FIG. 4
of the accompanying drawings. It should be noted here, however, that the arrangement shown in
FIG. 4
is not a prior art. The elongated I-shaped bracket “h” clamps the three injectors “a” down, but this elongated bracket “h” would raise a weight and cost. Similar reference numerals are used to designate similar elements in
FIGS. 3 and 4
, and description of other elements such as “b”, “f” and “g” is omitted here.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an arrangement for clamping three neighboring injectors, that is relatively lightweight and requires a less manufacturing cost.
According to one aspect of the present invention, there is provided an arrangement for clamping three linearly positioned injectors onto a cylinder head of an engine, including two “A”-shaped brackets each having one top branch and two foot branches (or forked legs), wherein the two “A”-shaped brackets are arranged in a manner such that two top branches of the two brackets are located adjacent to each other to clamp (or press down) a center injector among the three, and two pairs of foot branches of the two brackets are located apart from each other in opposite directions to clamp two side (or end) injectors, respectively. As compared with a single elongated bracket like that shown in
FIG. 4
, a weight corresponding to the space between the two brackets is reduced. This also contributes to manufacturing cost reduction since a less amount of material is needed.
The two brackets may possess the same configuration so that a single press machine can be used to make the two brackets. This will also contribute to cost reduction. Each injector may have a transversely extending flange that is pressed down by the two top branches of the two brackets or the two foot branches of the associated bracket. A line connecting the two foot branches of each bracket may extend through a center of the associated injector and a line connecting the two top branches of the two brackets may extend through a center of the center injector. Each bracket may have an opening at its approximate center so that a screw shaft extending from a cylinder head can penetrate therethrough. Each bracket may be secured on the cylinder head by tightening a nut over the screw shaft.


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patent: 5697345 (1997-12-01), Genter et al.
patent: 5878719 (1999-03-01), Nakagomi
patent: 5899190 (1999-05-01), Nakagomi et al.
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patent: 2213197A (1989-08-01), None
patent: 10-176629A (1998-06-01), None

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