Internal-combustion engines – High tension ignition system – Having a specific mounting of system component
Patent
1985-04-02
1986-10-21
Dolinar, Andrew M.
Internal-combustion engines
High tension ignition system
Having a specific mounting of system component
123634, 123635, F02P 302
Patent
active
046179070
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an ignition unit included in the ignition system of an internal combustion engine and including a plurality of finger-like connection pieces extending from a common upper part in the ignition unit and connectible to a corresponding number of spark plugs in the engine, said upper part including an electronic unit with components included in a high-tension block, each connection piece including an ignition element with an ignition coil for generating ignition voltage, as well as a connection device for connecting and for transmitting high-tension current to the engine spark plugs.
The basic features of an ignition unit of the kind in question are described in our earlier Swedish patent application No. 8204248-2, as well as the advantages which can be attained from the function and service aspects.
The present invention is a further development of an ignition unit exemplified in the application mentioned. The invention has the object of facilitating rational manufacturing of the parts included in the ignition unit and enabling reliable and loss-free transmission of high-tension current to the engine spark plugs during comparatively long periods also. The invention is thus distinguished chiefly by each ignition element of the ignition unit having cable-free electrical connection both to contact means in the upper part and to contact means in its connection device.
By the complete absence of current-carrying cables, not only between the ignition element and the connection device but also between the upper part and the ignition element, the implementation of the ignition unit and its fitting are facilitated while at the same time the risk of electrical faults is substantially reduced. The latter can also be explained by each ignition element being enclosed in a surrounding protective sleeve, which promotes loss-free and problem-free transmission over the contacts between the ignition element and the upper part as well as between the ignition element and the connection device even for difficult operating conditions.
In an advantageous embodiment of the ignition unit, each protective sleeve constitutes a portion of an integral outer casing which encloses the respective ignition elements and is mountably attached to the upper part of the ignition unit. There is thus enabled rational manufacture of the outer casing integrated with the sleeves and furthermore, mounting and removal of the ignition unit is facilitated.
Other distinguishing features of the invention are apparent from the accompanying claims and the following description of an advantageous embodiment exemplifying the invention. The description is made with reference to the accompanying figures, of which
FIG. 1 is a side view of a part of an ignition unit,
FIG. 2 is a cross section A--A according to FIG. 1,
FIG. 3 is a longitudinal section through a connection piece, substantially according to section B--B in FIG. 1, and
FIG. 4 is a cross section C--C through the connection piece according to FIG. 3.
It will be seen from FIGS. 1 and 2 that an inventive ignition unit 1 is formed with a plurality of dependent finger-like connection pieces 2. They extend from an upper part 4 common to all connection pieces 2, there being included in the upper part 4 an electronic unit (not shown) with components included in a high-tension block, i.e. components in the vehicle ignition system operating at voltages over 12 volts. These components are suitably included in circuit-boards 6 embedded in epoxy plastics or the like according to known so-called "solid state" technique. The uniting member of the upper part is an aluminium carrying section 8, which is intended to be fastened directly to supporting portions of an Otto engine (not shown), e.g. to the valve cover parts. Attachment is made by a plurality of screws (not shown) passing through screw-holes 9 in the upper part of the section 8. The section 8 is also provided with a plurality of upwardly directed cooling fins 10, and above them the ignition unit 1 is formed with a gripping rail
REFERENCES:
patent: 1532292 (1925-04-01), Woolson
patent: 2632132 (1953-03-01), Delano
patent: 3311783 (1967-03-01), Gibbs et al.
patent: 4195611 (1980-04-01), Worz et al.
patent: 4248201 (1981-02-01), Tsutsui et al.
patent: 4392473 (1983-07-01), Tsutsui et al.
Johansson Sven H.
Nytomt Jan G.
Dolinar Andrew M.
Saab-Scania Aktiebolag
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