US4671248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition cassette unit
Assignee: Hoerbiger Control Systems AB
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Filing: 1986-09-30
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Granted: 1987-06-09
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Expires: 2006-09-30
Abstract
Abstract The invention relates to an ignition cassette unit for an ignition system for a multi-cylinder Otto-type four-stroke engine equipped with at least one spark plug per cylinder, the ignition system including for each spark plug an ignition device (61,62) connectible to said spark plug in the engine substantially without cables, the ignition system also incorporating a control unit (8) sending signals in response to the engine operating conditions for triggering sparks at the spark plugs in a predetermined order. In order to ensure, in such ignition sytems, transmission of maximum ignition voltage to the engine spark plugs and enable simple and safe handling of the ignition system during service the the like, the invention is mainly distinguished in that the ignition devices (61,62) to at least two adjacent spark plugs are included in a common, handleable unit, a so-called ignition cassette (70). To advantage, the ignition system is of the capacitive type including an electric low-voltage block (2) and an electric high-voltage block (1), the high-voltage block (1) being included in one or more ignition cassettes (70).
Inventors
- 👤 Per S. Gillbrand
- 👤 Sven H. Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:45
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/03; F02P7/035; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
118 words
An ignition cassette unit in an ignition system for a multicylinder Otto-type engine having at least one spark plug for each cylinder, the ignition system comprising a low-voltage block for sending ignition control signals to a high-voltage block, the high-voltage block including a plurality of ignition devices and incorporated in the ignition cassette unit, said signals controlling the high-voltage block for supplying an ignition voltage to the spark plugs; and the ignition cassette unit comprising (a) a rigid member, (b) an outer casing attached to the rigid member; and (c) a plurality of ignition devices arranged in the casing and connected to the rigid member in predetermined positions with respect to the rigid member and the spark plugs.
Claim 2
Dependent Claim
118 words
An ignition cassette unit in an ignition system for a multicylinder Otto-type engine having at least one spark plug for each cylinder, the ignition system comprising a low-voltage block for sending ignition control signals to a high-voltage block, the high-voltage block including a plurality of ignition devices and incorporated in the ignition cassette unit, said signals controlling the high-voltage block for supplying an ignition voltage to the spark plugs; and the ignition cassette unit comprising (a) a rigid member, (b) an outer casing attached to the rigid member; and (c) a plurality of ignition devices arranged in the casing and connected to the rigid member in predetermined positions with respect to the rigid member and the spark plugs.
Claim 3
Dependent Claim
33 words
An ignition cassette unit as in claim 1, in which the ignition devices are supported by the outer casing, and the rest of the high voltage block is supported by the rigid member.
Claim 4
Dependent Claim
33 words
An ignition cassette unit as in claim 2, in which the outer casing partly surrounds each ignition device and comprises means for fixing the ignition devices in said predetermined positions in the casing.
Claim 5
Dependent Claim
40 words
An ignition cassette unit as in claim 1, in which the rigid member is a metal bar which is adapted for releasable attachment to surrounding engine parts, and which, when so attached, serves as an outer cover for the unit.
Claim 6
Dependent Claim
33 words
An ignition cassette unit as in claim 4, in which the ignition devices are supported by the outer casing, and the rest of the high voltage block is supported by the rigid member.
Claim 7
Dependent Claim
33 words
An ignition cassette unit as in claim 5, in which the outer casing partly surrounds each ignition device and comprises means for fixing the ignition devices in said predetermined positions in the casing.
Claim 8
Dependent Claim
31 words
An ignition cassette unit as in claim 4, in which the metal bar comprises two longitudinal dependent flanges between which components of the high voltage block are embedded in plastic material.
Claim 9
Dependent Claim
21 words
An ignition cassette unit as in claim 1, in which each ignition device comprises an ignition transformer encapsulated in plastic material.
Claim 10
Dependent Claim
124 words
An ignition cassette unit in an ignition system for a multicylinder Otto-type engine having at least one spark plug for each cylinder, the ignition system comprising a low-voltage block for sending ignition control signals to a high-voltage block incorporated in the ignition cassette unit, said signals controlling a plurality of ignition devices in said high-voltage block for generating an ignition voltage for triggering the spark plugs in the engine; and the cassette unit comprising a casing for supporting the ignition devices, each ignition device having an end surface with contact means for electrical connection with the respective spark plug, said contact means being surrounded by sealing means attached to the cassette unit for sealing the connection between the contact means and the spark plug.
Claim 11
Dependent Claim
124 words
An ignition cassette unit in an ignition system for a multicylinder Otto-type engine having at least one spark plug for each cylinder, the ignition system comprising a low-voltage block for sending ignition control signals to a high-voltage block incorporated in the ignition cassette unit, said signals controlling a plurality of ignition devices in said high-voltage block for generating an ignition voltage for triggering the spark plugs in the engine; and the cassette unit comprising a casing for supporting the ignition devices, each ignition device having an end surface with contact means for electrical connection with the respective spark plug, said contact means being surrounded by sealing means attached to the cassette unit for sealing the connection between the contact means and the spark plug.
Claim 12
Dependent Claim
32 words
An ignition cassette unit as in claim 9, in which the sealing means surrounding the contact means of each ignition device forms a seal against the end surface of the ignition device.
Claim 13
Dependent Claim
29 words
An ignition cassette unit as in claim 10, in which the sealing means is attached to the ignition cassette unit between the ignition device end surface and the casing.
Claim 14
Dependent Claim
23 words
An ignition cassette unit as claimed in claim 11, in which the contact means is centrally mounted on the ignition device end surface.
Claim 15
Dependent Claim
45 words
An ignition cassette unit as in claim 11, in which the sealing means is pressed axially in line with the spark plug between the ignition device end surface and a surface of the casing which surrounds a hole in the casing for said sealing means.
Claim 16
Dependent Claim
140 words
An ignition cassette unit in an ignition system for a multicylinder internal combustion engine having at least one spark plug per cylinder, said cassette unit being mountable on the spark plugs as a single handleable unit and comprising (a) an outer covering bar securable to adjacent engine parts when said ignition cassette unit is mounted on the spark plug; (b) a casing attached to the bar, the casing and the bar containing a substantially closed inner space which encloses at least a high-voltage block incorporated in the ignition system which high-voltage block comprises a plurality of ignition devices with contact means for transferring ignition voltage to the spark plugs; and (c) sealing means, supported by the casing and surrounding each contact means for sealingly surrounding a respective spark plug insulator, when the cassette unit is mounted on the spark plugs.
Claim 17
Dependent Claim
140 words
An ignition cassette unit in an ignition system for a multicylinder internal combustion engine having at least one spark plug per cylinder, said cassette unit being mountable on the spark plugs as a single handleable unit and comprising (a) an outer covering bar securable to adjacent engine parts when said ignition cassette unit is mounted on the spark plug; (b) a casing attached to the bar, the casing and the bar containing a substantially closed inner space which encloses at least a high-voltage block incorporated in the ignition system which high-voltage block comprises a plurality of ignition devices with contact means for transferring ignition voltage to the spark plugs; and (c) sealing means, supported by the casing and surrounding each contact means for sealingly surrounding a respective spark plug insulator, when the cassette unit is mounted on the spark plugs.
Claim 18
Dependent Claim
21 words
An ignition cassette unit as in claim 14, in which the outer covering bar is a metal bar with cooling fins.
Claim 19
Dependent Claim
20 words
An ignition cassette unit as in claim 15, in which the metal bar has dependent flanges cooperating with the casing.
Claim 20
Dependent Claim
31 words
An ignition cassette unit as in claim 14, in which each contact means is resiliently connectable to a spark plug central electrode and each sealing means is a resilient rubber boot.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |